CN104377659B - Seal ripple deblocking wave method and device, deblocking wave method and device and inverter circuit - Google Patents

Seal ripple deblocking wave method and device, deblocking wave method and device and inverter circuit Download PDF

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CN104377659B
CN104377659B CN201310359819.2A CN201310359819A CN104377659B CN 104377659 B CN104377659 B CN 104377659B CN 201310359819 A CN201310359819 A CN 201310359819A CN 104377659 B CN104377659 B CN 104377659B
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shaped
level inverter
supervisor
auxiliary pipe
inverter
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CN104377659A (en
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毛云鹤
田卿
张龙云
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Vertiv Corp
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Liebert Corp
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Abstract

The embodiments of the invention provide one kind envelope ripple deblocking wave method and device, deblocking wave method and device and inverter circuit, to solve to carry out envelope ripple to T-shaped three-level inverter using existing envelope wave method, or when using existing deblocking wave method unsealing ripple to T-shaped three-level inverter, the problem of auxiliary pipe in T-shaped three-level inverter can be caused to damage.This method includes：The electric current that the one end being connected in wave filter in one T-shaped three-level inverter of detection with the supervisor in the T-shaped three-level inverter is flowed through；It is more than first threshold in the electric current detected and the T-shaped three-level inverter is in when unsealing wavy state, no longer hair ripple unit is exported and is transferred to supervisor to the drive signal of the supervisor in the T-shaped three-level inverter, and turn off supervisor, and wait the first preset duration, and after the first preset duration terminates, no longer hair ripple unit is exported and is transferred to auxiliary pipe to the drive signal of the auxiliary pipe in the T-shaped three-level inverter, and turns off auxiliary pipe.

Description

Seal ripple-deblocking wave method and device, deblocking wave method and device and inverter circuit
Technical field
The present invention relates to electric and electronic technical field, more particularly to a kind of envelope ripple-deblocking wave method and device, deblocking ripple side Method and device and inverter circuit.
Background technology
UPS（Uninterruptible Power Supply, uninterrupted power source）Refer to work as alternating current input power supplying（Such as city Electricity）When generation is abnormal or powers off, moreover it is possible to continue to power to the load, and can guarantee that power supply quality, make load supplying impregnable Device, the reliability of power supply can be ensured.Inverter is one of important technology in UPS, and it is whole that the performance of inverter directly affects UPS Efficiency, cost and the reliability of machine.
Existing UPS inverters are when using T-shaped three-level inverter, structure such as Fig. 1 institutes of T-shaped three-level inverter Show, during using existing envelope wave method, if detecting the electric current of T-shaped three-level inverter output, that is, flow through inductance L1 electric current During more than some value, the hair ripple unit of the switch element in T-shaped three-level inverter is driven（Generate the electricity of ripple unit connecting T-shaped three The control terminal of the switch element in each switch element in flat inverter, hair ripple unit are not shown in Fig. 1）, control this T-shaped Switch element Q1, Q2, Q3 and Q4 of three-level inverter seal ripple simultaneously, that is, simultaneously close off；Wherein, switch element Q1, Q2, Q3 and In Q4 include a switching device and with the antiparallel diode of the switching device, electric capacity Cp_Q2 be switch element Q2 knot Electric capacity, electric capacity Cp_Q3 are switch element Q3 junction capacity.But because although hair ripple unit has been simultaneously emitted by shut-off switch list The signal of switching device in first Q1, Q2, Q3 and Q4, but because the delay of signal transmission is different, cut-off signals reach switch The time delay of the control terminal of switching device in unit Q1, Q2, Q3 and Q4 will be different.If opening in switch element Q2 and Q3 Close device and first receive cut-off signals, receive cut-off signals after the switching device in switch element Q1 and Q4, then will go out Switching device in existing switch element Q2 and Q3 is first turned off, and is turned off after the switching device in switch element Q1 and Q4.
Assuming that T-shaped three-level inverter is operated in positive half period, i.e. electric current flows to the inductance L1 right side on the left of inductance L1 Side, now, the switching device shut-off in switch element Q4.It is preferable in circuit layout, in the case of the leakage inductance for ignoring circuit, when adopting When sealing ripple with existing envelope wave method, if the switching device shut-off in switch element Q2 and Q3, due to opening in switch element Q1 Break-over of device is closed, therefore, electric current can flow to inductance L1 from switch element Q1, and therefore, the voltage of a points is clamped to positive pole line voltage +UBUS, the diode current flow in switch element Q2, the voltage difference U between 2 points of b, cbcVoltage difference between=0.7,2 points of a, b Uab=+UBUS.And when the switching device shut-off in switch element Q1, the electric current for flowing through inductance L1 passes through two in switch element Q4 Pole pipe afterflow, the current potential of a points is by positive pole line voltage+UBUSSaltus step is negative busbar voltage-UBUS, due to Uc+Ubc+Uab=Ua, therefore Ubc =Uac-Uab=-UBUS-Uab, because the voltage on switch element Q3 junction capacity Cp_Q3 will not undergo mutation, therefore Ubc=-UBUS- Uab=-2*UBUS, that is to say, that the instantaneous voltage on switch element Q2 junction capacity Cp_Q2 can reach full busbar voltage, and open After the junction capacity Cp_Q3 electric discharge completions for closing unit Q3, the voltage at switch element Q2 junction capacity Cp_Q2 both ends can be just one side of something Busbar voltage, the voltage at switch element Q1 both ends is full edges generating line voltage.
Assuming that T-shaped three-level inverter is operated in negative half-cycle, i.e. electric current flows to an inductance L1 left side on the right side of inductance L1 Side, now, the switching device shut-off in switch element Q1.It is preferable in circuit layout, in the case of the leakage inductance for ignoring circuit, when adopting When sealing ripple with existing envelope wave method, if the switching device shut-off in switch element Q2 and Q3, due to opening in switch element Q4 Break-over of device is closed, therefore, electric current can flow to switch element Q4 from inductance L1, and now, the voltage of a points is clamped to negative busbar electricity Pressure-UBUS, the diode current flow in switch element Q3, the voltage difference U between 2 points of a, babVoltage between 2 points of=- 0.7V, b, c Poor Ubc=-UBUS.And when the switching device shut-off in switch element Q4, the electric current for flowing through inductance L1 passes through in switch element Q1 Diode continuousing flow, the current potential of a points is by negative busbar voltage-UBUSSaltus step is positive pole line voltage+UBUS, due to Uc+Ubc+Uab=Ua, therefore Uab=Uac-Ubc=UBUS-Ubc, because the voltage on switch element Q2 junction capacity Cp_Q2 will not undergo mutation, therefore Uab=UBUS- Ubc=2*UBUS, that is to say, that the instantaneous voltage on switch element Q3 junction capacity Cp_Q3 can reach full edges generating line voltage, and After switch element Q2 junction capacity Cp_Q2 electric discharges are completed, the voltage at switch element Q3 junction capacity Cp_Q3 both ends can be just half Edges generating line voltage, the voltage at switch element Q1 both ends is full edges generating line voltage.
When therefore, using existing envelope wave method, it is possible to first Feng Fuguan occurs（Switch in switch element Q2, Q3 Device）, then seal supervisor（Switching device in switch element Q1, Q4）Situation, as the above analysis, now auxiliary pipe moment hold The voltage received can be full edges generating line voltage, because the maximum voltage that auxiliary pipe can be born is usually to be slightly larger than half of busbar voltage, Therefore, it may appear that the situation of auxiliary pipe overvoltage.Also, in wave process is sealed, as switch element Q1（Or Q4）In switching device close It is disconnected, and after circuit stability, switch element Q1（Or Q4）The voltage born is full edges generating line voltage, due to switch element Q1（Or Q4） The maximum voltage that can be born is usually to be slightly larger than full edges generating line voltage, therefore, switch element Q1（Or Q4）In switching device The moment of shut-off, switch element Q1（Or Q4）The voltage born may be more than its maximum voltage that can bear.
During using existing deblocking wave method, if detecting the electric current of T-shaped three-level inverter output, that is, inductance L1 is flowed through Electric current when being no larger than some value, drive the hair ripple unit of the switch element in T-shaped three-level inverter（Ripple unit is sent out to connect The control terminal of the switching device in each switch element in T-shaped three-level inverter is connect, hair ripple unit is not shown in Fig. 1）, Control switch element Q1, Q2, Q3 and Q4 of the T-shaped three-level inverter while unseal ripple, i.e., it is simultaneously open-minded.But due to hair Although ripple unit has been simultaneously emitted by opening the signal of the switching device in switch element Q1, Q2, Q3 and Q4, but because signal passes Defeated delay is different, and the time delay that open signal reaches the control terminal of the switching device in switch element Q1, Q2, Q3 and Q4 will not Together.If the switching device in switch element Q1 and Q4 first receives open signal, the switching device in switch element Q2 and Q3 After receive open signal, then just occur that the switching device in switch element Q1 and Q4 is first open-minded, and switch element Q2 and It is open-minded after switching device in Q3.
Assuming that electric current flows to inductance L1 right side on the left of inductance L1, now, in switch element Q1, Q2, Q3 and Q4 Switching device is turned off, and electric current flows through the diode in switch element Q4, and the current potential of a points is negative busbar voltage-UBUS, switch list Diode current flow in first Q3, the voltage difference U between 2 points of a, babVoltage difference U between 2 points of=- 0.7V, b, cbc=-UBUS.When During using existing deblocking wave method deblocking ripple, the switch device conductive in switch element Q1, the diode in switch element Q4 Turned off by backward voltage, electric current can flow to inductance L1 from switch element Q1, therefore, the voltage of a points by negative busbar voltage- UBUSJump to positive pole line voltage+UBUS, due to Uc+Ubc+Uab=Ua, therefore Uab=Uac-Ubc=UBUS-Ubc, due to switch element Q2's Voltage on junction capacity Cp_Q2 will not undergo mutation, therefore Uab=UBUS-Ubc=2*UBUS, that is to say, that switch element Q3 knot Instantaneous voltage on electric capacity Cp_Q3 can reach full edges generating line voltage.When the switching device in switch element Q2 is opened, switching After unit Q2 junction capacity Cp_Q2 electric discharges are completed, the voltage at switch element Q3 junction capacity Cp_Q3 both ends is half edges generating line electricity Pressure, the voltage at switch element Q1 both ends is full edges generating line voltage.
Assuming that electric current flows to inductance L1 left side on the right side of inductance L1, now, in switch element Q1, Q2, Q3 and Q4 Switching device is turned off, and electric current flows through the diode in switch element Q1, and the current potential of a points is positive pole line voltage+UBUS, switch list Diode current flow in first Q2, the voltage difference U between 2 points of b, cbcVoltage difference U between=0.7,2 points of a, bab=+UBUS.When adopting During with existing deblocking wave method deblocking ripple, the switch device conductive in switch element Q4, diode in switch element Q1 by Turned off to backward voltage, electric current can flow to switch element Q4 from inductance L1, and therefore, the current potential of a points is by positive pole line voltage+UBUS Saltus step is negative busbar voltage-UBUS, due to Uc+Ubc+Uab=Ua, therefore Ubc=Uac-Uab=-UBUS-Uab, due to switch element Q3 knot Voltage on electric capacity Cp_Q3 will not undergo mutation, therefore Ubc=-UBUS-Uab=-2*UBUS, that is to say, that switch element Q2 knot Instantaneous voltage on electric capacity Cp_Q2 can reach full edges generating line voltage.When the switching device in switch element Q3 is opened, switching After unit Q3 junction capacity Cp_Q3 electric discharges are completed, the voltage at switch element Q2 junction capacity Cp_Q2 both ends is half edges generating line electricity Pressure, the voltage at switch element Q1 both ends is full edges generating line voltage.
When therefore, using existing deblocking wave method, it is possible to first deblocking supervisor occurs（In switch element Q1, Q4 Switching device）, then unseal auxiliary pipe（Switching device in switch element Q2, Q3）Situation, as the above analysis, now auxiliary pipe The voltage that moment bears can be full edges generating line voltage, because the maximum voltage that auxiliary pipe can be born is usually to be slightly larger than half edges generating line Voltage, therefore, it may appear that the situation of auxiliary pipe overvoltage.Also, in wave process is unsealed, as switch element Q1（Or Q4）In switch Device is open-minded, and after circuit stability, switch element Q4（Or Q1）The voltage born is full edges generating line voltage, due to switch element Q1 （Or Q4）The maximum voltage that can be born is usually to be slightly larger than full edges generating line voltage, therefore, switch element Q1（Or Q4）In open Close the moment of device shut-off, switch element Q4（Or Q1）The voltage born may be more than its maximum voltage that can bear.
In summary, during to T-shaped three-level inverter using existing envelope wave method envelope ripple, due to it is possible that auxiliary pipe First tube sealing, tube sealing after supervisor, so as to cause the instantaneous voltage that auxiliary pipe is born to be more than its maximum voltage that can be born, and then cause The problem of auxiliary pipe in T-shaped three-level inverter damages；Also, when using existing deblocking wave method deblocking ripple, due to can Can occur being responsible for it is first open-minded, it is open-minded after auxiliary pipe, so as to cause the instantaneous voltage that auxiliary pipe is born to be more than its maximum electricity that can be born The problem of pressing, and then causing the auxiliary pipe in T-shaped three-level inverter to damage.
The content of the invention
The embodiments of the invention provide one kind envelope ripple-deblocking wave method and device, deblocking wave method and device and inversion electricity Road, during solving to carry out envelope ripple to T-shaped three-level inverter using existing envelope wave method, due to it is possible that auxiliary pipe is first The situation of tube sealing after tube sealing, supervisor, the problem of so as to cause auxiliary pipe in T-shaped three-level inverter to damage；And solve using existing When some deblocking wave methods unseal ripple to T-shaped three-level inverter, first open-minded, the feelings opened after auxiliary pipe are responsible for due to being likely to occur Condition, the problem of so as to cause auxiliary pipe in T-shaped three-level inverter to damage
Based on above mentioned problem, a kind of envelope ripple-deblocking wave method provided in an embodiment of the present invention, including：
It is connected in wave filter in one T-shaped three-level inverter of detection with the supervisor in the T-shaped three-level inverter The electric current that flows through of one end；
It is more than first threshold in the electric current detected and the T-shaped three-level inverter is in when unsealing wavy state, no longer Hair ripple unit is exported and is transferred to the supervisor to the drive signal of the supervisor in the T-shaped three-level inverter, and turns off institute Supervisor is stated, and waits the first preset duration, and after the first preset duration terminates, is no longer exported the hair ripple unit to institute The drive signal for stating the auxiliary pipe in T-shaped three-level inverter is transferred to the auxiliary pipe, and turns off the auxiliary pipe.
A kind of envelope ripple-deblocking wave apparatus provided in an embodiment of the present invention, including：
First detection module, it is inverse with T-shaped three level in the wave filter in a T-shaped three-level inverter for detecting The electric current that one end that the supervisor become in device is connected is flowed through；
First control module, for being in the electric current detected more than first threshold and the T-shaped three-level inverter When unsealing wavy state, no longer hair ripple unit is exported and is transferred to the drive signal of the supervisor in the T-shaped three-level inverter The supervisor, and the supervisor is turned off, and the first preset duration is waited, and after the first preset duration terminates, no longer by institute State hair ripple unit to export and be transferred to the auxiliary pipe to the drive signal of the auxiliary pipe in the T-shaped three-level inverter, and turn off institute State auxiliary pipe.
A kind of deblocking wave method provided in an embodiment of the present invention, including：
It is connected in wave filter in one T-shaped three-level inverter of detection with the supervisor in the T-shaped three-level inverter The electric current that flows through of one end；
It is in the electric current detected no more than the 3rd threshold value and the T-shaped three-level inverter when sealing wavy state, control Auxiliary pipe in the T-shaped three-level inverter is open-minded, and waits the 4th preset duration, and after the 4th preset duration terminates, The auxiliary pipe that the non-length in the T-shaped three-level inverter is led to is determined according to the zero cross signal of voltage, and the non-length for turning off determination is led to Auxiliary pipe, and the 5th preset duration is waited, and after the 5th preset duration terminates, by the T-shaped three-level inverter It is responsible for open-minded, and the hair ripple unit is exported and is transferred to institute to the drive signal of the supervisor in the T-shaped three-level inverter State supervisor, the zero cross signal of the voltage be in the wave filter in the T-shaped three-level inverter with the T-shaped tri-level inversion The zero cross signal of the voltage of one end that the supervisor in device is connected.
A kind of deblocking wave apparatus provided in an embodiment of the present invention, including：
Second detection module, it is inverse with T-shaped three level in the wave filter in a T-shaped three-level inverter for detecting The electric current that one end that the supervisor become in device is connected is flowed through；
Second control module, for being in the electric current detected no more than T-shaped three-level inverter described in the 3rd threshold value When sealing wavy state, control the auxiliary pipe in the T-shaped three-level inverter open-minded, and wait the 4th preset duration, and the 4th After preset duration terminates, the auxiliary pipe that the non-length in the T-shaped three-level inverter is led to is determined according to the zero cross signal of voltage, and close The logical auxiliary pipe of the disconnected non-length determined, and the 5th preset duration is waited, and after the 5th preset duration terminates, by described T-shaped three Supervisor in electrical level inverter is open-minded, and the hair ripple unit is exported to the drive to the supervisor in the T-shaped three-level inverter Dynamic signal is transferred to the supervisor, the zero cross signal of the voltage in the wave filter in the T-shaped three-level inverter with institute State the zero cross signal of the voltage of one end that the supervisor in T-shaped three-level inverter is connected.
A kind of inverter circuit provided in an embodiment of the present invention, including at least one T-shaped three-level inverter, ripple unit is sent out, Also include control unit and at least one detection judging unit；The hair ripple unit connection control unit, described control unit point The control terminal of the supervisor in each T-shaped three-level inverter and the control terminal of auxiliary pipe are not connected, it is each to detect judging unit connection With being responsible for the one end being connected in wave filter in one T-shaped three-level inverter；
Each detection judging unit, for detect in the wave filter in the T-shaped three-level inverter being connected with itself with master The electric current that the connected one end of pipe is flowed through, and detecting that the electric current is in more than T-shaped three-level inverter described in first threshold When unsealing wavy state, the first notification signal is sent to control unit；
Described control unit, for after receiving and carrying out the first notification signal of Autonomous test judging unit, will no longer send out ripple The drive signal that unit exports the supervisor in the T-shaped three-level inverter to the detection judging unit connection is transferred to the master Pipe, and the supervisor is turned off, and the first preset duration is waited, and after the first preset duration terminates, will no longer send out ripple unit The drive signal for exporting the auxiliary pipe in the T-shaped three-level inverter to the detection judging unit connection is transferred to the auxiliary pipe, And turn off the auxiliary pipe.
Another inverter circuit provided in an embodiment of the present invention, including at least one T-shaped three-level inverter, send out ripple list Member, in addition to control unit and at least one detection judging unit；The hair ripple unit connection control unit, described control unit The control terminal of the supervisor in each T-shaped three-level inverter and the control terminal of auxiliary pipe are connected respectively, and each judging unit that detects connects Connect in the wave filter in a T-shaped three-level inverter with being responsible for the one end being connected；
Each detection judging unit, for detect in the wave filter in the T-shaped three-level inverter being connected with itself with institute State the electric current that the connected one end of the supervisor in T-shaped three-level inverter is flowed through, and detecting that the electric current is not more than the 3rd threshold When value and the T-shaped three-level inverter are in envelope wavy state, third notice signal is sent to control unit；
Described control unit, for after the third notice signal for carrying out Autonomous test judging unit is received, controlling the inspection The auxiliary pipe surveyed in the T-shaped three-level inverter of judging unit connection is open-minded, and waits the 4th preset duration, and default the 4th After duration terminates, the auxiliary pipe that non-length is logical in the T-shaped three-level inverter is determined according to the zero cross signal of voltage, and turn off determination The logical auxiliary pipe of non-length, and the 5th preset duration is waited, and after the 5th preset duration terminates, by the detection judging unit Supervisor in the T-shaped three-level inverter of connection is open-minded, and hair ripple unit is exported to the master in the T-shaped three-level inverter The drive signal of pipe is transferred to the supervisor, and hair ripple unit is exported to the auxiliary pipe in the T-shaped three-level inverter Drive signal is transferred to the auxiliary pipe, and the zero cross signal of the voltage is inverse for T-shaped three level of the detection judging unit connection Become the zero cross signal of the voltage of one end of switch element of the connection comprising supervisor in the wave filter in device.
The beneficial effect of the embodiment of the present invention includes：
Envelope ripple-deblocking wave method and device provided in an embodiment of the present invention, deblocking wave method and device and inverter circuit, lead to Cross and detect the electric current that one end of switch element of the connection comprising supervisor in wave filter in each T-shaped three-level inverter is flowed through, And detect that the electric current is more than the T-shaped three-level inverter of first threshold for one, no longer hair ripple unit is exported T-shaped to this The drive signal of the switching device in switch element comprising supervisor in three-level inverter is transferred to the switching device, and turns off The switching device, and the first preset duration is waited, and after the first preset duration terminates, no longer export hair ripple unit to this The drive signal of switching device in T-shaped three-level inverter in the switch element comprising auxiliary pipe is transferred to the switching device, and The switching device is turned off, so as to ensure that T-shaped three-level inverter when sealing ripple, is responsible for tube sealing after first tube sealing, auxiliary pipe, avoided the occurrence of The instantaneous voltage that auxiliary pipe is born be more than its maximum voltage that can be born situation, so as to overcome due to bear voltage it is excessive and Caused by auxiliary pipe the problem of being damaged.In addition, included by detecting to connect in the wave filter in each T-shaped three-level inverter The electric current that one end of the switch element of supervisor is flowed through, and detect that the electric current is not more than T-shaped the three of the 3rd threshold value for one Electrical level inverter, control the switching device in the T-shaped three-level inverter in the switch element comprising auxiliary pipe open-minded, and wait the Four preset durations, and after the 4th preset duration terminates, determined according to the zero cross signal of voltage comprising the logical auxiliary pipe of non-length Switch element, and the switching device in the switch element of determination is turned off, and the 5th preset duration is waited, and when the 5th is default After length terminates, the switching device that will be included in the T-shaped three-level inverter in the switch element of supervisor will be open-minded, and will send out ripple unit Export and be transferred to switching device to the drive signal of the switching device in each switch element in the T-shaped three-level inverter；From And ensure T-shaped three-level inverter when unsealing ripple, auxiliary pipe first opens, be responsible for after it is open-minded, avoid the occurrence of auxiliary pipe bear it is instantaneous Voltage is more than its maximum voltage that can bear, so as to overcome due to bear voltage it is excessive and caused by auxiliary pipe be damaged Problem.
Brief description of the drawings
Fig. 1 is the structural representation of T-shaped three-level inverter of the prior art；
Fig. 2 is the flow chart of one of envelope ripple-deblocking wave method provided in an embodiment of the present invention；
Fig. 3 is two flow chart of envelope ripple-deblocking wave method provided in an embodiment of the present invention；
Fig. 4 is the flow chart of deblocking wave method provided in an embodiment of the present invention；
Fig. 5 is the structural representation of envelope ripple-deblocking wave apparatus provided in an embodiment of the present invention；
Fig. 6 is the structural representation of deblocking wave apparatus provided in an embodiment of the present invention；
Fig. 7 is the schematic diagram of one of the structure of single-phase inversion circuit provided in an embodiment of the present invention；
Fig. 8 is the schematic diagram of one of the structure of three-phase inverting circuit provided in an embodiment of the present invention；
Fig. 9 a are two schematic diagram of the structure of single-phase inversion circuit provided in an embodiment of the present invention；
Fig. 9 b are two schematic diagram of the structure of three-phase inverting circuit provided in an embodiment of the present invention.
Embodiment
When carrying out envelope ripple to T-shaped three-level inverter using existing envelope wave method, in fact it could happen that auxiliary pipe elder generation tube sealing, master The situation of tube sealing after pipe, and when tube sealing after auxiliary pipe elder generation tube sealing, supervisor, the auxiliary pipe in T-shaped three-level inverter bears instantaneous Voltage can be more than its maximum voltage that can bear, therefore, this may result in supervisor in T-shaped three-level inverter, auxiliary pipe by It is damaged in the overtension born.Also, T-shaped three-level inverter is solved using existing deblocking wave method When sealing ripple, in fact it could happen that the situation that supervisor first opens, opened after auxiliary pipe, and when supervisor first opens, opened after auxiliary pipe, T-shaped three The instantaneous voltage that auxiliary pipe in electrical level inverter is born can be more than its maximum voltage that can be born, and therefore, this may result in T Auxiliary pipe in type three-level inverter is damaged due to the overtension born.Therefore, the embodiments of the invention provide one Kind envelope ripple-deblocking wave method and device, deblocking wave method and device and inverter circuit, can make T-shaped three level inverse when sealing ripple Become the supervisor elder generation tube sealing in device, tube sealing after auxiliary pipe, auxiliary pipe in T-shaped three-level inverter can be made first to open, be main when unsealing ripple It is open-minded after pipe, the problem of being damaged so as to the auxiliary pipe overcome in T-shaped three-level inverter due to the overtension born.
With reference to Figure of description, to envelope ripple-deblocking wave method provided in an embodiment of the present invention and device, deblocking ripple side Method and the embodiment of device and inverter circuit illustrate.
A kind of envelope ripple-deblocking wave method provided in an embodiment of the present invention, as shown in Fig. 2 this method includes：
S201, detection one T-shaped three-level inverter in wave filter in supervisor's phase in the T-shaped three-level inverter The electric current that one end even is flowed through；
The electric current that S202, determination detect is more than first threshold and the T-shaped three-level inverter is in the state of deblocking ripple；
The state that T-shaped three-level inverter is in deblocking ripple refers to that the T-shaped three-level inverter can be defeated in hair ripple unit The direct current signal received is converted to the working condition of AC signal under the control of the drive signal gone out.
S203, no longer hair ripple unit is exported and is transferred to institute to the drive signal of the supervisor in the T-shaped three-level inverter Supervisor is stated, and turns off the supervisor, and waits the first preset duration；
Because each T-shaped three-level inverter includes two supervisors, by taking the T-shaped three-level inverter shown in Fig. 1 as an example, Two supervisors refer to the switching device in switching device and switch element Q4 in switch element Q1, therefore, in the electricity detected When stream is more than first threshold, no longer hair ripple unit is exported and transmitted to the drive signal of the supervisor in the T-shaped three-level inverter To the supervisor, refer to no longer export hair ripple unit in the switch element Q1 in the T-shaped three-level inverter shown in Fig. 1 The drive signal of switching device is transferred to the switching device, and no longer exports hair ripple unit inverse to T-shaped three level shown in Fig. 1 The drive signal for becoming the switching device in device in switch element Q4 is transferred to the switching device；Shut-off supervisor refers to turn off Fig. 1 institutes The switching device in the switching device and switch element Q4 in switch element Q1 in the T-shaped three-level inverter shown, if this Two switching devices are low level shut-offs, then the switch in switch element Q1 into the T-shaped three-level inverter shown in Fig. 1 The control terminal output low level signal of device, and the control terminal output low level signal of the switching device into switch element Q4； If the two switching devices are high level shut-offs, then in the switch element Q1 into the T-shaped three-level inverter shown in Fig. 1 Switching device control terminal output high level signal, and control terminal from the switching device to switch element Q4 output high level Signal.Two equal reliable turn-offs of supervisor in T-shaped three-level inverter after the first preset duration terminates.
S204, after the first preset duration terminates, no longer by it is described hair ripple unit export to the T-shaped three-level inverter In the drive signal of auxiliary pipe be transferred to the auxiliary pipe, and turn off the auxiliary pipe；
Because each T-shaped three-level inverter includes two auxiliary pipes, by taking the T-shaped three-level inverter shown in Fig. 1 as an example, Two auxiliary pipes refer to the switching device in switching device and switch element Q3 in switch element Q2, therefore, in the electricity detected When stream is more than first threshold, no longer hair ripple unit is exported and transmitted to the drive signal of the auxiliary pipe in the T-shaped three-level inverter To the auxiliary pipe, refer to no longer export hair ripple unit in the switch element Q2 in the T-shaped three-level inverter shown in Fig. 1 The drive signal of switching device is transferred to the switching device, and no longer exports hair ripple unit inverse to T-shaped three level shown in Fig. 1 The drive signal for becoming the switching device in device in switch element Q3 is transferred to the switching device；Auxiliary pipe is turned off to refer to turn off Fig. 1 institutes The switching device in the switching device and switch element Q3 in switch element Q2 in the T-shaped three-level inverter shown, if this Two switching devices are low level shut-offs, then the switch in switch element Q2 into the T-shaped three-level inverter shown in Fig. 1 The control terminal output low level signal of device, and the control terminal output low level signal of the switching device into switch element Q3； If the two switching devices are high level shut-offs, then in the switch element Q2 into the T-shaped three-level inverter shown in Fig. 1 Switching device control terminal output high level signal, and control terminal from the switching device to switch element Q3 output high level Signal.
During S202-S204 is performed, S201 is being performed always.
Below by taking the T-shaped three-level inverter shown in Fig. 1 as an example, analysis is using the envelope wave method described in S202-S204 to T When type three-level inverter carries out envelope ripple, being responsible in the T-shaped three-level inverter and the voltage that auxiliary pipe is born.Wherein, Fig. 1 institutes Wave filter in the T-shaped three-level inverter shown includes inductance L1 and electric capacity C1, therefore, the filter in the T-shaped three-level inverter The electric current that the one end being connected in ripple device with the supervisor in the T-shaped three-level inverter is flowed through, just refer to the electric current of a points, that is, Inductance L1 electric current is flowed through, certainly, the wave filter in T-shaped three-level inverter can also use the wave filter of other forms.
Assuming that T-shaped three-level inverter is operated in positive half period, i.e. electric current is flowed in the T-shaped three-level inverter from a points Wave filter, now, the shut-off of switching device in switch element Q4, the switching device in switch element Q2 is open-minded.When using this The envelope wave method envelope ripple that inventive embodiments provide, i.e., when sealing ripple using the envelope wave method described in S202-S204, if switch element Q1 With the switching device shut-off in Q4, i.e. supervisor's shut-off, then electric current is through in the switching device in switch element Q2 and switch element Q3 Diode flow to wave filter, therefore, the voltage of a points is by positive pole line voltage+UBUSNeutral point N voltage is jumped to, it is steady in circuit After fixed, switch element Q1 bears half of busbar voltage；C, the voltage difference U between 2 points of bcbElectricity between 2 points of=0.3V, b, a Pressure difference Uba=0.7V.And when the switching device shut-off in switch element Q2 and Q3, i.e. auxiliary pipe shut-off, electric current is by switch element Q4 In diode flow to wave filter, therefore, the current potentials of a points is negative busbar voltage-U by neutral point N voltage jumpBUS, due to Uc +Ubc+Uab=Ua, therefore Ucb=Uca-Uba=-UBUS-Uba, because the voltage on switch element Q3 junction capacity Cp_Q3 will not occur Mutation, therefore Ucb=Uca-Uba=-UBUS, that is to say, that the instantaneous voltage on switch element Q2 junction capacity Cp_Q2 can reach half Busbar voltage.
Assuming that T-shaped three-level inverter is operated in negative half-cycle, i.e. electric current is from the wave filter in the T-shaped three-level inverter A points are flowed to, now, the switching device in switch element Q1 turns off, and the switching device in switch element Q3 is open-minded.When using this hair The envelope wave method envelope ripple that bright embodiment provides, i.e., when sealing ripple using the envelope wave method described in S202-S204, if switch element Q1 and Switching device shut-off in Q4, i.e. supervisor's shut-off, then electric current is through opening in the diode in switch element Q2 and switch element Q3 Close device and flow to wave filter, now, the voltage of a points is by negative busbar voltage-UBUSNeutral point N voltage is jumped to, in circuit stability Afterwards, switch element Q4 bears half of busbar voltage；B, the voltage difference U between 2 points of cbcVoltage between 2 points of=0.7V, a, b Poor Uab=0.3V.And when the switching device shut-off in switch element Q2 and Q3, i.e. auxiliary pipe shut-off, electric current is by switch element Q1 Diode flow to wave filter, the current potentials of a points is positive pole line voltage+U by neutral point voltage saltus stepBUS, due to Uc+Ubc+Uab=Ua, Therefore Uab=Uac-Ubc=UBUS-Ubc, because the voltage on switch element Q2 junction capacity Cp_Q2 will not undergo mutation, therefore Uab= UBUS-Ubc=UBUS, that is to say, that the instantaneous voltage on switch element Q3 junction capacity Cp_Q3 can reach half of busbar voltage.
Due to, the maximum voltage that auxiliary pipe can be born in T-shaped three-level inverter is usually to be slightly larger than half of busbar voltage, The maximum voltage that being responsible for bear is usually to be slightly larger than full edges generating line voltage, therefore, using envelope provided in an embodiment of the present invention When wave method carries out envelope ripple to T-shaped three-level inverter, it is ensured that the electricity that auxiliary pipe is instantaneously born in the T-shaped three-level inverter Pressure not more than its maximum voltage that can bear, overcomes excessive due to bearing voltage, causes in T-shaped three-level inverter The problem of auxiliary pipe damage.
Further, a kind of envelope ripple-deblocking wave method provided in an embodiment of the present invention, as shown in figure 3, also including：
The electric current that S301, determination detect is in no more than Second Threshold and the T-shaped three-level inverter and seals wavy state；
The state that T-shaped three-level inverter is in envelope ripple refers to two supervisors in the T-shaped three-level inverter and two Auxiliary pipe is in the state of shut-off.
S302, control the auxiliary pipe in the T-shaped three-level inverter open-minded, and wait the second preset duration；
Because each T-shaped three-level inverter includes two auxiliary pipes, by taking the T-shaped three-level inverter shown in Fig. 1 as an example, Two auxiliary pipes refer to the switching device in switching device and switch element Q3 in switch element Q2, therefore, control T-shaped three level Auxiliary pipe in inverter, which is opened, to be referred to, by the switching device in the switch element Q2 in the T-shaped three-level inverter shown in Fig. 1 and Switching device in switch element Q3 is open-minded, if the two switching devices are high level conductings, then to the T shown in Fig. 1 The control terminal output high level signal of the switching device in switch element Q2 in type three-level inverter, and to switch element Q3 In switching device control terminal output high level signal；If the two switching devices are low level conductings, then to Fig. 1 institutes The control terminal output low level signal of the switching device in switch element Q2 in the T-shaped three-level inverter shown, and to switch The control terminal output low level signal of switching device in unit Q3.After the second preset duration terminates, T-shaped three-level inverter In two auxiliary pipes it is reliable open-minded.
S303, after the second preset duration terminates, determined according to the zero cross signal of voltage in the T-shaped three-level inverter The logical auxiliary pipe of non-length, and the auxiliary pipe that the non-length that turns off determination is logical, and wait the 3rd preset duration；The zero cross signal of voltage is The voltage of the one end being connected in the wave filter in the T-shaped three-level inverter with the supervisor in the T-shaped three-level inverter Zero cross signal；
Determine that the T-shaped three-level inverter is operated in positive half period by the zero cross signal of voltage, be still operated in negative half period Phase.When the T-shaped three-level inverter is operated in positive half period, by taking the three-level inverter in Fig. 1 as an example, T-shaped three level The auxiliary pipe that non-length in inverter is led to is the switching device in switch element Q3；When the T-shaped three-level inverter is operated in negative half During the cycle, by taking the three-level inverter in Fig. 1 as an example, the auxiliary pipe that the non-length in the T-shaped three-level inverter is led to is switch element Switching device in Q2.After the 3rd preset duration terminates, the logical auxiliary pipe reliable turn-off of non-length in T-shaped three-level inverter.
S304, after the 3rd preset duration terminates, it is the supervisor in the T-shaped three-level inverter is open-minded, and ripple will be sent out Unit exports is transferred to the supervisor to the drive signal of the supervisor in the T-shaped three-level inverter, and will send out ripple unit Export and be transferred to the auxiliary pipe to the drive signal of the auxiliary pipe in the T-shaped three-level inverter；
Because each T-shaped three-level inverter includes two supervisors, by taking the T-shaped three-level inverter shown in Fig. 1 as an example, Two supervisors refer to the switching device in switching device and switch element Q4 in switch element Q1, therefore, hair ripple unit is defeated Go out and be transferred to the supervisor to the drive signal of the supervisor in the T-shaped three-level inverter, refer to export hair ripple unit to Fig. 1 The drive signal of the switching device in switch element Q1 in shown T-shaped three-level inverter is transferred to the switching device, and Hair ripple unit is exported and passed to the drive signal of the switching device in switch element Q4 in the T-shaped three-level inverter shown in Fig. 1 It is defeated by the switching device.
Because each T-shaped three-level inverter includes two auxiliary pipes, by taking the T-shaped three-level inverter shown in Fig. 1 as an example, Two auxiliary pipes refer to the switching device in switching device and switch element Q3 in switch element Q2, therefore, hair ripple unit is defeated Go out and be transferred to the auxiliary pipe to the drive signal of the auxiliary pipe in the T-shaped three-level inverter, refer to export hair ripple unit to Fig. 1 The drive signal of the switching device in switch element Q2 in shown T-shaped three-level inverter is transferred to the switching device, and Hair ripple unit is exported and passed to the drive signal of the switching device in switch element Q3 in the T-shaped three-level inverter shown in Fig. 1 It is defeated by the switching device.
The embodiment of the present invention also provides a kind of deblocking wave method, as shown in figure 4, this method includes：
S401, detection one T-shaped three-level inverter in wave filter in supervisor's phase in the T-shaped three-level inverter The electric current that one end even is flowed through；
The electric current that S402, determination detect is in no more than the 3rd threshold value and the T-shaped three-level inverter and seals wavy state；
S403, control the auxiliary pipe in the T-shaped three-level inverter open-minded, and wait the 4th preset duration；
After the 4th preset duration terminates, two auxiliary pipes in T-shaped three-level inverter are reliable open-minded.
S404, after the 4th preset duration terminates, determined according to the zero cross signal of voltage in the T-shaped three-level inverter The logical auxiliary pipe of non-length, and the auxiliary pipe that the non-length that turns off determination is logical, and wait the 5th preset duration；The zero cross signal of voltage is The voltage of the one end being connected in the wave filter in the T-shaped three-level inverter with the supervisor in the T-shaped three-level inverter Zero cross signal；
After the 5th preset duration terminates, the logical auxiliary pipe reliable turn-off of non-length in T-shaped three-level inverter.
S405, after the 5th preset duration terminates, it is the supervisor in the T-shaped three-level inverter is open-minded, and ripple will be sent out Unit exports is transferred to the supervisor to the drive signal of the supervisor in the T-shaped three-level inverter, and will send out ripple unit Export and be transferred to the auxiliary pipe to the drive signal of the auxiliary pipe in the T-shaped three-level inverter.
During S402-S405 is performed, S401 is being performed always.
Below by taking the T-shaped three-level inverter shown in Fig. 1 as an example, analysis is using the deblocking wave method described in S402-S405 When carrying out deblocking ripple to T-shaped three-level inverter, being responsible in the T-shaped three-level inverter and the voltage that auxiliary pipe is born.Wherein, The wave filter in T-shaped three-level inverter shown in Fig. 1 includes inductance L1 and electric capacity C1, therefore, in the T-shaped three-level inverter Wave filter in the electric current that flows through of one end for being connected with the supervisor in the T-shaped three-level inverter, just refer to the electric currents of a points, Inductance L1 electric current is exactly flowed through, certainly, the wave filter in T-shaped three-level inverter can also use the filtering of other forms Device.
Assuming that T-shaped three-level inverter is operated in positive half period, i.e. electric current is flowed in the T-shaped three-level inverter from a points Wave filter, now, the switching device in switch element Q1, Q2, Q3 and Q4 is turned off, and electric current flows through two in switch element Q4 Pole pipe, the current potential of a points is negative busbar voltage-UBUS, the diode current flow in switch element Q3, the voltage difference U between 2 points of a, bab Voltage difference U between 2 points of=- 0.7V, b, cbc=-UBUS.When using deblocking wave method deblocking ripple provided in an embodiment of the present invention, The switching device in switching device and switch element Q3 in switch element Q2 is open-minded, and the diode in switch element Q4 is by anti- Being turned off to voltage, electric current can flow to wave filter from the diode in the switching device in switch element Q2 and switch element Q3, Therefore, the voltage of a points is by negative busbar voltage-UBUSJump to neutral point N voltage, the voltage difference U between 2 points of c, bcb=0.3V, B, the voltage difference U between 2 points of aba=0.7V.And turn off the logical auxiliary pipe of non-length, i.e. after switching device in switch element Q3, electric current Still wave filter can be flowed to from the diode in the switching device in switch element Q2 and switch element Q3, therefore, the voltage of a points Remain neutral point N voltage.And the switching device worked as in the switching device and switch element Q4 in switch element Q1 is open-minded, and And the switching device in switch element Q1, the switching device in switch element Q2, switching device and switch in switch element Q3 After switching device in unit Q4 receives corresponding drive signal, the switching device in switch element Q1 is open-minded, the electricity of a points Pressure is positive direct-current busbar voltage+U by neutral point N voltage jumpBUS, due to Uc+Ubc+Uab=Ua, therefore Uab=Uac-Ubc=+UBUS- Ubc, because the voltage on switch element Q2 junction capacity Cp_Q2 will not undergo mutation, therefore Uab=+UBUS-Ubc=+UBUS, also It is to say, the instantaneous voltage on switch element Q3 junction capacity Cp_Q3 can reach half of busbar voltage.
Assuming that T-shaped three-level inverter is operated in negative half-cycle, i.e. electric current is from the wave filter in the T-shaped three-level inverter A points are flowed to, now, the switching device in switch element Q1, Q2, Q3 and Q4 is turned off, and electric current flows through two in switch element Q1 Pole pipe, the current potential of a points is positive pole line voltage+UBUS, the diode current flow in switch element Q2, the voltage difference U between 2 points of b, cbc Voltage difference U between=0.7,2 points of a, bab=+UBUS.When using deblocking wave method deblocking ripple provided in an embodiment of the present invention, open The switching device closed in the switching device and switch element Q3 in unit Q2 is open-minded, and the diode in switch element Q1 is by reverse Voltage and turn off, electric current can flow to wave filter from the diode in the switching device in switch element Q2 and switch element Q3, because This, the current potential of a points is by positive pole line voltage+UBUSSaltus step is neutral point N voltage, the voltage difference U between 2 points of b, cbc=0.7V, a, Voltage difference U between 2 points of bab=0.3V.And turn off the logical auxiliary pipe of non-length, i.e. after switching device in switch element Q2, electric current according to So wave filter can be flowed to from the diode in the switching device in switch element Q3 and switch element Q2, therefore, the voltage of a points is protected Hold as neutral point N voltage.And the switching device worked as in the switching device and switch element Q4 in switch element Q1 is open-minded, and And the switching device in switch element Q1, the switching device in switch element Q2, switching device and switch in switch element Q3 After switching device in unit Q4 receives corresponding drive signal, the switching device in switch element Q4 is open-minded, the electricity of a points Pressure is positive direct-current busbar voltage-U by neutral point N voltage jumpBUS, due to Uc+Ubc+Uab=Ua, therefore Uab=Uac-Ubc=-UBUS- Ubc, because the voltage on switch element Q2 junction capacity Cp_Q2 will not undergo mutation, therefore Uab=-UBUS-Ubc=-UBUS, also It is to say, the instantaneous voltage on switch element Q3 junction capacity Cp_Q3 can reach half of busbar voltage.
Because the maximum voltage that auxiliary pipe can be born in T-shaped three-level inverter is usually to be slightly larger than half of busbar voltage Therefore, when electrical level inverter of being received using deblocking wave method provided in an embodiment of the present invention to T-shaped plug carries out deblocking ripple, it is ensured that The maximum voltage that the voltage that auxiliary pipe is instantaneously born in the T-shaped three-level inverter is not more than it and can born is overcome due to holding It is excessive by voltage, the problem of causing auxiliary pipe in T-shaped three-level inverter to damage.
Envelope wave method provided in an embodiment of the present invention and deblocking wave method, both can be used alone, can also be used cooperatively. T-shaped three level of damage caused by existing envelope wave method using only envelope wave method provided in an embodiment of the present invention, can be overcome The problem of auxiliary pipe in inverter；When using only deblocking wave method provided in an embodiment of the present invention, existing deblocking can be overcome The problem of auxiliary pipe in T-shaped three-level inverter is damaged caused by wave method；If by envelope wave method provided in an embodiment of the present invention It is used cooperatively with deblocking wave method, then can overcomes T-shaped three level of damage caused by existing envelope wave method and deblocking wave method The problem of auxiliary pipe in inverter.
Based on same inventive concept, the embodiment of the present invention additionally provide a kind of envelope ripple-deblocking wave apparatus, deblocking wave apparatus and Control circuit, by these devices and control circuit solve the principle of problem and foregoing envelope ripple-deblocking wave method and deblocking ripple Method is similar, therefore the implementation of the device and control circuit may refer to the implementation of preceding method, repeats part and repeats no more.
A kind of envelope ripple-deblocking wave apparatus provided in an embodiment of the present invention, as shown in figure 5, including：
First detection module 51, for detect a T-shaped three-level inverter in wave filter in T-shaped three level The electric current that one end that supervisor in inverter is connected is flowed through；
First control module 52, for being more than in the electric current detected at first threshold and the T-shaped three-level inverter When wavy state is unsealed, no longer hair ripple unit is exported and transmitted to the drive signal of the supervisor in the T-shaped three-level inverter To the supervisor, and the supervisor is turned off, and wait the first preset duration, and after the first preset duration terminates, no longer will The hair ripple unit exports is transferred to the auxiliary pipe to the drive signal of the auxiliary pipe in the T-shaped three-level inverter, and turns off The auxiliary pipe.
Further, the first control module 52 is additionally operable to, and is not more than Second Threshold and described T-shaped three in the electric current detected Electrical level inverter is in when sealing wavy state, controls the auxiliary pipe in the T-shaped three-level inverter open-minded, and wait second it is default when It is long, and after the second preset duration terminates, the non-length in the T-shaped three-level inverter is determined according to the zero cross signal of voltage Logical auxiliary pipe, and the auxiliary pipe that the non-length for turning off determination is led to, and the 3rd preset duration is waited, and terminate in the 3rd preset duration Afterwards, it is the supervisor in the T-shaped three-level inverter is open-minded, and hair ripple unit is exported in the T-shaped three-level inverter The drive signal of supervisor be transferred to the supervisor, and hair ripple unit is exported to auxiliary in the T-shaped three-level inverter The drive signal of pipe is transferred to the auxiliary pipe, and the zero cross signal of the voltage is the wave filter in the T-shaped three-level inverter In the zero cross signal of the voltage of one end that is connected with the supervisor in the T-shaped three-level inverter.
The embodiment of the present invention also provides a kind of deblocking wave apparatus, as shown in fig. 6, including：
Second detection module 61, for detect a T-shaped three-level inverter in wave filter in T-shaped three level The electric current that one end that supervisor in inverter is connected is flowed through；
Second control module 62, for being not more than the 3rd threshold value and the T-shaped three-level inverter in the electric current detected In when sealing wavy state, control the auxiliary pipe in the T-shaped three-level inverter open-minded, and wait the 4th preset duration, Yi Ji After 4th preset duration terminates, the auxiliary pipe that the non-length in the T-shaped three-level inverter is led to is determined according to the zero cross signal of voltage, And the auxiliary pipe that the non-length for turning off determination is led to, and the 5th preset duration is waited, and after the 5th preset duration terminates, by the T Supervisor in type three-level inverter is open-minded, and the hair ripple unit is exported to the supervisor in the T-shaped three-level inverter Drive signal be transferred to the supervisor, the zero cross signal of the voltage is in the wave filter in the T-shaped three-level inverter The zero cross signal of the voltage of the one end being connected with the supervisor in the T-shaped three-level inverter.
A kind of inverter circuit provided in an embodiment of the present invention, when the inverter circuit is single-phase inversion circuit, such as Fig. 7 institutes Show, specifically include 73, a T-shaped three-level inverter 71, hair ripple unit 72, control unit detection judging units 74, hair Ripple unit 72 connects control unit 73, control unit 73 distinguish the supervisor in connecting T-shaped three-level inverter 71 control terminal and The control terminal of switching device in the control terminal of auxiliary pipe, i.e. Q1, Q2, Q3 and Q4, detection judging unit 74 connecting T-shaped, three level are inverse Become with the supervisor in T-shaped three-level inverter 71 in the wave filter 75 in device 71, i.e. the switch in switching device and Q4 in Q1 Connected one end of device, that is to say, that a points in the detection connecting T-shaped three-level inverter 71 of judging unit 74；
Detect judging unit 74, for detect in the wave filter 75 in the T-shaped three-level inverter 71 that is connected with itself with T The electric current that one end that supervisor in type three-level inverter 71 is connected is flowed through, and it is more than first threshold and T in the electric current detected When type three-level inverter 71 is in deblocking wavy state, the first notification signal is sent to control unit 73；
Control unit 73, for after receiving and carrying out the first notification signal of Autonomous test judging unit 74, will no longer send out ripple The drive signal that unit 72 exports the supervisor in the T-shaped three-level inverter 71 connected to detection judging unit 74 is transferred to master Pipe, and supervisor is turned off, and the first preset duration is waited, and after the first preset duration terminates, it is defeated will no longer to send out ripple unit 72 The drive signal of the auxiliary pipe gone out in the T-shaped three-level inverter 71 connected to detection judging unit 74 is transferred to auxiliary pipe, and turns off Auxiliary pipe.
Further, judging unit 74 is detected, is additionally operable to what is be connected in T-shaped three-level inverter 71 is detected with supervisor The electric current that one end is flowed through is in when sealing wavy state no more than Second Threshold and T-shaped three-level inverter 71, is sent out to control unit 73 Send the second notification signal；
Control unit 73, it is additionally operable to after receiving and carrying out the second notification signal of Autonomous test judging unit 74, control detection Auxiliary pipe in the T-shaped three-level inverter 71 that judging unit 74 connects is open-minded, and waits the second preset duration, and pre- second After if duration terminates, the auxiliary pipe that the non-length in T-shaped three-level inverter 71 is led to is determined according to the zero cross signal of voltage, and turn off true The logical auxiliary pipe of fixed non-length, and the 3rd preset duration is waited, and after the 3rd preset duration terminates, judging unit 74 will be detected Supervisor in the T-shaped three-level inverter 71 of connection is open-minded, and hair ripple unit 72 is exported in T-shaped three-level inverter 71 The drive signal of supervisor is transferred to supervisor, and hair ripple unit 72 is exported to the drive to the auxiliary pipe in T-shaped three-level inverter 71 Dynamic signal is transferred to auxiliary pipe, and the zero cross signal of voltage is the filter in the T-shaped three-level inverter 71 of the detection connection of judging unit 74 The zero cross signal of the voltage of the one end being connected in ripple device 75 with supervisor.
In the inverter circuit shown in Fig. 7, the zero cross signal of detection judging unit detection voltage can be used.
When inverter circuit is three-phase inverting circuit, as shown in figure 8, specifically include a T-shaped three-level inverter 81_A, 83, one T-shaped three-level inverter 81_B, a T-shaped three-level inverter 81_C, hair ripple unit 82, control unit inspections Judging unit 84_A, a detection judging unit 84_B, a detection judging unit 84_C are surveyed, it is single that hair ripple unit 82 connects control Member 83, control unit 83 distinguish the control terminal of the supervisor in connecting T-shaped three-level inverter 81_A and the control terminal of auxiliary pipe, T-shaped The control terminal of supervisor in three-level inverter 81_B and the control terminal of auxiliary pipe, supervisor in T-shaped three-level inverter 81_C The control terminal of control terminal and auxiliary pipe, detect in the wave filter 85_A in judging unit 84_A connecting T-shaped three-level inverters 81_A One end being connected with the supervisor in T-shaped three-level inverter 81_A, that is to say, that the electricity of detection judging unit 84_A connecting T-shapeds three A points in flat inverter 81_A；Detect in the wave filter 85_B in judging unit 84_B connecting T-shaped three-level inverters 81_B with One end that supervisor in T-shaped three-level inverter 81_B is connected, that is to say, that the level of detection judging unit 84_B connecting T-shapeds three A points in inverter 81_B；Detect in the wave filter 85_C in judging unit 84_C connecting T-shaped three-level inverters 81_C with T One end that supervisor in type three-level inverter 81_C is connected, that is to say, that detection judging unit 84_C three level of connecting T-shaped are inverse The a points become in device 81_C.
The working method of each detection judging unit and the working method phase of the detection judging unit in single-phase inversion circuit Together, will not be repeated here.The result that control unit detects according to each detection judging unit, to detection judging unit connection One mutually T-shaped three-level inverter carries out sealing ripple or unseals ripple.Control unit carries out Feng Bofang to each mutually T-shaped three-level inverter Formula, with control unit in single-phase inversion circuit to T-shaped three-level inverter carry out seal ripple mode it is identical, will not be repeated here； Control unit to each mutually T-shaped three-level inverter carry out unseal ripple mode, with single-phase inversion circuit in control unit to T-shaped three The mode that electrical level inverter unseal ripple is identical, will not be repeated here.
Due to Metal-oxide-semicondutor FET（MOSFET, Metal-Oxide-Semiconductor Field Effect Transistor）In low current, relative to insulated gate bipolar transistor（IGBT, Insulated Gate Bipolar Transistor）For conduction loss it is smaller, switching loss is relatively low, but expensive；And IGBT is in big electricity Flow field conjunction conduction loss is small, and switching loss is small for MOSFET, but price is relatively low.And in T-shaped three-level inverter Supervisor switching loss and conduction loss it is all very big, therefore, using MOSFET, and the auxiliary pipe in T-shaped three-level inverter Switching loss may be considered 0, and when load of its connection is resistive load, the conduction loss of auxiliary pipe is than supervisor's Small more of conduction loss, therefore, auxiliary pipe can use IGBT, to realize the best price/performance ratio of T-shaped three-level inverter.
Therefore, when inverter circuit provided in an embodiment of the present invention is single-phase inversion circuit, as illustrated in fig. 9, inversion electricity The supervisor in T-shaped three-level inverter in road is MOSFET, and the auxiliary pipe in T-shaped three-level inverter in the inverter circuit is IGBT.Other parts in inverter circuit shown in Fig. 9 a are identical with the corresponding component in the inverter circuit shown in Fig. 7, Fig. 9 a institutes Company between the annexation between all parts in the inverter circuit shown and the corresponding component in the inverter circuit shown in Fig. 7 The operation principle for connecing the inverter circuit that relation is identical, shown in Fig. 9 a is identical with the operation principle of the inverter circuit shown in Fig. 7.
When inverter circuit provided in an embodiment of the present invention is three-phase inverting circuit, as shown in figure 9b, in the inverter circuit Each phase T-shaped three-level inverter in supervisor be MOSFET, the T-shaped tri-level inversion of each phase in the inverter circuit Auxiliary pipe in device is IGBT.Other parts in inverter circuit shown in Fig. 9 b and the corresponding portion in the inverter circuit shown in Fig. 8 Part is identical, the annexation between all parts in inverter circuit shown in Fig. 9 b and pair in the inverter circuit shown in Fig. 8 Answer the annexation between part identical, the work of the inverter circuit shown in the operation principle and Fig. 8 of the inverter circuit shown in Fig. 9 b It is identical to make principle.
Another inverter circuit provided in an embodiment of the present invention, when the inverter circuit is single-phase inversion circuit, such as Fig. 7 It is shown, 73, a T-shaped three-level inverter 71, hair ripple unit 72, control unit detection judging units 74 are specifically included, Send out ripple unit 72 and connect control unit 73, control unit 73 distinguishes the control terminal of the supervisor in connecting T-shaped three-level inverter 71 With the control terminal of the control terminal of auxiliary pipe, i.e. switching device in Q1, Q2, Q3 and Q4, the level of 74 connecting T-shaped of detection judging unit three With the supervisor in T-shaped three-level inverter 71 in wave filter 75 in inverter 71, i.e. opening in the switching device and Q4 in Q1 Close the connected one end of device, that is to say, that a points in the detection connecting T-shaped three-level inverter 71 of judging unit 74；
Detect judging unit 74, for detect in the wave filter 75 in the T-shaped three-level inverter 71 that is connected with itself with T The electric current that supervisor in type three-level inverter 71 is flowed through connected one end, in T-shaped three-level inverter 71 is detected with master The electric current that the connected one end of pipe is flowed through is in when sealing wavy state no more than the 3rd threshold value and T-shaped three-level inverter 71, to control Unit 73 sends third notice signal；
Control unit 73, it is additionally operable to after the third notice signal for carrying out Autonomous test judging unit 74 is received, control detection Auxiliary pipe in the T-shaped three-level inverter 71 that judging unit 74 connects is open-minded, and waits the 4th preset duration, and pre- the 4th After if duration terminates, the auxiliary pipe that the non-length in T-shaped three-level inverter 71 is led to is determined according to the zero cross signal of voltage, and turn off true The logical auxiliary pipe of fixed non-length, and the 5th preset duration is waited, and after the 5th preset duration terminates, judging unit 74 will be detected Supervisor in the T-shaped three-level inverter 71 of connection is open-minded, and hair ripple unit 72 is exported in T-shaped three-level inverter 71 The drive signal of supervisor is transferred to supervisor, and hair ripple unit 72 is exported to the drive to the auxiliary pipe in T-shaped three-level inverter 71 Dynamic signal is transferred to auxiliary pipe, and the zero cross signal of voltage is the filter in the T-shaped three-level inverter 71 of the detection connection of judging unit 74 The zero cross signal of the voltage of the one end being connected in ripple device 75 with supervisor.
When inverter circuit is three-phase inverting circuit, its structure is identical with the structure of the inverter circuit shown in Fig. 8.Each inspection It is identical with the working method of the detection judging unit in single-phase inversion circuit to survey the working method of judging unit, it is no longer superfluous herein State.The result that control unit detects according to each detection judging unit, to mutually T-shaped three level of detection judging unit connection Inverter carries out sealing ripple or unseals ripple.Control unit carries out sealing ripple mode to each mutually T-shaped three-level inverter, with single-phase inversion In circuit control unit to T-shaped three-level inverter carry out seal ripple mode it is identical, will not be repeated here；Control unit is to each Mutually T-shaped three-level inverter unseal control unit in ripple mode, with single-phase inversion circuit and T-shaped three-level inverter is carried out It is identical to unseal the mode of ripple, will not be repeated here.
Further, when inverter circuit provided in an embodiment of the present invention is single-phase inversion circuit, the T in the inverter circuit Supervisor in type three-level inverter is MOSFET, and the auxiliary pipe in T-shaped three-level inverter in the inverter circuit is IGBT, should The structure of single-phase inversion circuit is identical with the structure of the inverter circuit shown in Fig. 9 a.When inverter circuit provided in an embodiment of the present invention For three-phase inverting circuit when, the supervisor in the T-shaped three-level inverter of each phase in the inverter circuit is MOSFET, the inversion Auxiliary pipe in the T-shaped three-level inverter of each phase in circuit is IGBT, shown in the structure and Fig. 9 b of the three-phase inverting circuit Inverter circuit structure it is identical.
Through the above description of the embodiments, those skilled in the art can be understood that the embodiment of the present invention It can be realized by hardware, the mode of necessary general hardware platform can also be added by software to realize.Based on such reason Solution, the technical scheme of the embodiment of the present invention can be embodied in the form of software product, and the software product can be stored in one Individual non-volatile memory medium（Can be CD-ROM, USB flash disk, mobile hard disk etc.）In, including some instructions to cause one meter Calculate machine equipment（Can be personal computer, server, or network equipment etc.）Perform the side described in each embodiment of the present invention Method.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, module or stream in accompanying drawing Journey is not necessarily implemented necessary to the present invention.
It will be appreciated by those skilled in the art that the module in device in embodiment can describe be divided according to embodiment It is distributed in the device of embodiment, respective change can also be carried out and be disposed other than in one or more devices of the present embodiment.On The module for stating embodiment can be merged into a module, can also be further split into multiple submodule.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to comprising including these changes and modification.

Claims (8)

1. one kind envelope ripple-deblocking wave method, it is characterised in that including：
One to be connected in wave filter in one T-shaped three-level inverter of detection with the supervisor in the T-shaped three-level inverter Hold the electric current flowed through；
It is more than first threshold in the electric current detected and the T-shaped three-level inverter is in when unsealing wavy state, no longer will hair Ripple unit exports is transferred to the supervisor to the drive signal of the supervisor in the T-shaped three-level inverter, and turns off the master Pipe, and the first preset duration is waited, and after the first preset duration terminates, no longer export the hair ripple unit to the T The drive signal of auxiliary pipe in type three-level inverter is transferred to the auxiliary pipe, and turns off the auxiliary pipe；
Methods described also includes：
It is in the electric current detected no more than Second Threshold and the T-shaped three-level inverter when sealing wavy state, controls the T Auxiliary pipe in type three-level inverter is open-minded, and waits the second preset duration, and after the second preset duration terminates, according to electricity The zero cross signal of pressure determines the logical auxiliary pipe of the non-length in the T-shaped three-level inverter, and the auxiliary pipe that the non-length for turning off determination is logical, And the 3rd preset duration is waited, and after the 3rd preset duration terminates, the supervisor in the T-shaped three-level inverter is opened It is logical, and hair ripple unit is exported and is transferred to the supervisor to the drive signal of the supervisor in the T-shaped three-level inverter, and Hair ripple unit is exported and is transferred to the auxiliary pipe, the voltage to the drive signal of the auxiliary pipe in the T-shaped three-level inverter Zero cross signal be the T-shaped three-level inverter in wave filter in be connected with the supervisor in the T-shaped three-level inverter One end voltage zero cross signal.
2. one kind envelope ripple-deblocking wave apparatus, it is characterised in that including：
First detection module, for detect a T-shaped three-level inverter in wave filter in the T-shaped three-level inverter In the electric current that flows through of the connected one end of supervisor；
First control module, for being in deblocking more than first threshold and the T-shaped three-level inverter in the electric current detected During wavy state, no longer hair ripple unit is exported be transferred to the drive signal of the supervisor in the T-shaped three-level inverter it is described Supervisor, and the supervisor is turned off, and the first preset duration is waited, and after the first preset duration terminates, no longer by the hair Ripple unit exports is transferred to the auxiliary pipe to the drive signal of the auxiliary pipe in the T-shaped three-level inverter, and turns off described auxiliary Pipe；
Wherein, first control module is additionally operable to：
It is in the electric current detected no more than Second Threshold and the T-shaped three-level inverter when sealing wavy state, controls the T Auxiliary pipe in type three-level inverter is open-minded, and waits the second preset duration, and after the second preset duration terminates, according to electricity The zero cross signal of pressure determines the logical auxiliary pipe of the non-length in the T-shaped three-level inverter, and the auxiliary pipe that the non-length for turning off determination is logical, And the 3rd preset duration is waited, and after the 3rd preset duration terminates, the supervisor in the T-shaped three-level inverter is opened It is logical, and hair ripple unit is exported and is transferred to the supervisor to the drive signal of the supervisor in the T-shaped three-level inverter, and Hair ripple unit is exported and is transferred to the auxiliary pipe, the voltage to the drive signal of the auxiliary pipe in the T-shaped three-level inverter Zero cross signal be the T-shaped three-level inverter in wave filter in be connected with the supervisor in the T-shaped three-level inverter One end voltage zero cross signal.
3. one kind deblocking wave method, it is characterised in that including：
One to be connected in wave filter in one T-shaped three-level inverter of detection with the supervisor in the T-shaped three-level inverter Hold the electric current flowed through；
It is in the electric current detected no more than the 3rd threshold value and the T-shaped three-level inverter when sealing wavy state, controls the T Auxiliary pipe in type three-level inverter is open-minded, and waits the 4th preset duration, and after the 4th preset duration terminates, according to electricity The zero cross signal of pressure determines the logical auxiliary pipe of the non-length in the T-shaped three-level inverter, and the auxiliary pipe that the non-length for turning off determination is logical, And the 5th preset duration is waited, and after the 5th preset duration terminates, the supervisor in the T-shaped three-level inverter is opened It is logical, and hair ripple unit is exported and is transferred to the supervisor to the drive signal of the supervisor in the T-shaped three-level inverter, it is described The zero cross signal of voltage be the T-shaped three-level inverter in wave filter in the supervisor in the T-shaped three-level inverter The zero cross signal of the voltage of connected one end.
4. one kind deblocking wave apparatus, it is characterised in that including：
Second detection module, for detect a T-shaped three-level inverter in wave filter in the T-shaped three-level inverter In the electric current that flows through of the connected one end of supervisor；
Second control module, for being in envelope no more than the 3rd threshold value and the T-shaped three-level inverter in the electric current detected During wavy state, control the auxiliary pipe in the T-shaped three-level inverter open-minded, and wait the 4th preset duration, and it is pre- the 4th After if duration terminates, the auxiliary pipe that the non-length in the T-shaped three-level inverter is led to is determined according to the zero cross signal of voltage, and turn off The auxiliary pipe that the non-length determined is led to, and the 5th preset duration is waited, and after the 5th preset duration terminates, by T-shaped three electricity Supervisor in flat inverter is open-minded, and hair ripple unit is exported to the drive signal to the supervisor in the T-shaped three-level inverter It is transferred to the supervisor, the zero cross signal of the voltage is with described T-shaped three in the wave filter in the T-shaped three-level inverter The zero cross signal of the voltage of one end that the supervisor in electrical level inverter is connected.
5. a kind of inverter circuit, including at least one T-shaped three-level inverter, send out ripple unit, it is characterised in that also include control Unit and at least one detection judging unit；The hair ripple unit connection control unit, described control unit connect each T respectively The control terminal of the control terminal of supervisor in type three-level inverter and auxiliary pipe, each judging unit that detects connect T-shaped three electricity With being responsible for the one end being connected in wave filter in flat inverter；
Each detection judging unit, for detecting in the wave filter in the T-shaped three-level inverter being connected with itself with being responsible for phase The electric current that one end even is flowed through, and detecting that the electric current is more than first threshold and the T-shaped three-level inverter is in solution When sealing wavy state, the first notification signal is sent to control unit；
Described control unit, for after receiving and carrying out the first notification signal of Autonomous test judging unit, will no longer send out ripple unit The drive signal for exporting the supervisor in the T-shaped three-level inverter to the detection judging unit connection is transferred to the supervisor, And the supervisor is turned off, and the first preset duration is waited, and after the first preset duration terminates, no longer will the unit output of hair ripple Drive signal to the auxiliary pipe in the T-shaped three-level inverter of the detection judging unit connection is transferred to the auxiliary pipe, and closes Break the auxiliary pipe；
Wherein, judging unit is each detected, is additionally operable in the T-shaped three-level inverter is detected with being responsible for the one end being connected The electric current flowed through is in no more than Second Threshold and the T-shaped three-level inverter when sealing wavy state, and the is sent to control unit Two notification signals；
Described control unit, it is additionally operable to after receiving and carrying out the second notification signal of Autonomous test judging unit, controls the detection Auxiliary pipe in the T-shaped three-level inverter of judging unit connection is open-minded, and waits the second preset duration, and when second is default After length terminates, the auxiliary pipe that the non-length in the T-shaped three-level inverter is led to is determined according to the zero cross signal of voltage, and turn off determination The logical auxiliary pipe of non-length, and the 3rd preset duration is waited, and after the 3rd preset duration terminates, by the detection judging unit Supervisor in the T-shaped three-level inverter of connection is open-minded, and hair ripple unit is exported to the master in the T-shaped three-level inverter The drive signal of pipe is transferred to the supervisor, and hair ripple unit is exported to the auxiliary pipe in the T-shaped three-level inverter Drive signal is transferred to the auxiliary pipe, and the zero cross signal of the voltage is inverse for T-shaped three level of the detection judging unit connection The zero cross signal of the voltage of the one end being connected in the wave filter become in device with supervisor.
6. inverter circuit as claimed in claim 5, it is characterised in that in the T-shaped three-level inverter in the inverter circuit Supervisor be Metal-oxide-semicondutor FET MOSFET, in the T-shaped three-level inverter in the inverter circuit Auxiliary pipe is insulated gate bipolar transistor IGBT.
7. a kind of inverter circuit, including at least one T-shaped three-level inverter, send out ripple unit, it is characterised in that also include control Unit and at least one detection judging unit；The hair ripple unit connection control unit, described control unit connect each T respectively The control terminal of the control terminal of supervisor in type three-level inverter and auxiliary pipe, each judging unit that detects connect T-shaped three electricity With being responsible for the one end being connected in wave filter in flat inverter；
Each detection judging unit, for detect in the wave filter in the T-shaped three-level inverter being connected with itself with it is described T-shaped The electric current that supervisor in three-level inverter is flowed through connected one end, and detecting that the electric current is not more than the 3rd threshold value and institute T-shaped three-level inverter is stated in when sealing wavy state, third notice signal is sent to control unit；
Described control unit, for after the third notice signal for carrying out Autonomous test judging unit is received, controlling the detection to sentence Auxiliary pipe in the T-shaped three-level inverter of disconnected unit connection is open-minded, and waits the 4th preset duration, and in the 4th preset duration After end, the auxiliary pipe that non-length is logical in the T-shaped three-level inverter is determined according to the zero cross signal of voltage, and turn off the non-of determination Long logical auxiliary pipe, and the 5th preset duration is waited, and after the 5th preset duration terminates, by the detection judging unit connection T-shaped three-level inverter in supervisor it is open-minded, and by hair ripple unit export to the supervisor's in the T-shaped three-level inverter Drive signal is transferred to the supervisor, and hair ripple unit is exported to the driving to the auxiliary pipe in the T-shaped three-level inverter Signal is transferred to the auxiliary pipe, and the zero cross signal of the voltage is the T-shaped three-level inverter for detecting judging unit connection In wave filter in connection comprising supervisor switch element one end voltage zero cross signal.
8. inverter circuit as claimed in claim 7, it is characterised in that in the T-shaped three-level inverter in the inverter circuit Supervisor be Metal-oxide-semicondutor FET MOSFET, in the T-shaped three-level inverter in the inverter circuit Auxiliary pipe is insulated gate bipolar transistor IGBT.
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CN105552851B (en) * 2015-12-28 2018-10-02 阳光电源股份有限公司 A kind of three-level inverter pwm pulse envelope wave method and device
CN106230292B (en) * 2016-08-17 2019-02-01 阳光电源股份有限公司 A kind of pwm pulse of three-level inverter puts wave method and controller
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CN110649831B (en) 2019-05-10 2021-04-13 阳光电源股份有限公司 Shutdown wave-sealing control method of multi-level inverter circuit and application device thereof
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