CN103944433B - A kind of three-phase tri-level inverter circuit and uninterrupted power source - Google Patents
A kind of three-phase tri-level inverter circuit and uninterrupted power source Download PDFInfo
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- CN103944433B CN103944433B CN201410178868.0A CN201410178868A CN103944433B CN 103944433 B CN103944433 B CN 103944433B CN 201410178868 A CN201410178868 A CN 201410178868A CN 103944433 B CN103944433 B CN 103944433B
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Abstract
Embodiments provide a kind of three-phase tri-level inverter circuit and uninterrupted power source, the midpoint that between positive bus-bar and negative busbar, the electric capacity of series connection produces is depended in order to solve current three-phase tri-level inverter circuit, and capacitances in series can cause equivalent capacity to reduce, this can improve the problem of cost of bus capacitor in inverter circuit in some occasion.The cross-bridges arm of three T-shaped inversion topologicals in the three-phase tri-level inverter circuit of T-shaped for existing employing inversion topological is connected as triangular structure by this inverter circuit, cross-bridges arm in each T-shaped inversion topological is constant with the connection of perpendicular brachium pontis therein, thus when three cross-bridges arms are all opened, this three-phase tri-level inverter circuit is made to export midpoint potential, therefore, the midpoint potential of the three-phase tri-level inverter circuit output that the embodiment of the present invention provides is without relying on the current potential at the midpoint of the electric capacity of series connection between positive direct-current bus and negative dc bus.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly relate to a kind of three-phase tri-level inverter circuit and not between
Power-off source.
Background technology
The general structure of multi-electrical level inverter output signal is to approach by several level steps synthesis staircase waveform
Sine output voltage.This inverter is due to the increase of output-voltage levels number so that the harmonic wave of output waveform
Content reduces, and the voltage stress that switch is born reduces, it is not necessary to equalizer circuit, can avoid big dv/dt
The problems such as the electrical machine insulation caused.Within 1977, occur in that three level utilizing switching tube to assist neutral point clamp
Converter main circuit, after this circuit is improved by people, it is proposed that diode clamp formula inverter circuit.
People propose the structure of multi-electrical level inverter always according to the structure of three-level inverter.
Diode clamp formula T-shaped topology inverter circuit is as it is shown in figure 1, switching device 101 in Fig. 1, open
Close device 102, switching device 103 and switching device 104 and include a full-control type device for power switching respectively
With this antiparallel diode of full-control type device for power switching, electric capacity 105 and electric capacity 106 are just connected on
Between dc bus DC+ and negative dc bus DC-, the junction point of electric capacity 105 and electric capacity 106 is neutral point
N.Full-control type merit in switching device 101, switching device 102, switching device 103 and switching device 104
The control end of rate switching device connects modulation circuit.This circuit control principle is as follows: receive at modulation circuit
The positive half period of signal wave, the full-control type device for power switching in switching device 101 exports at modulation circuit
Signal control under high frequency open shutoff, the full-control type device for power switching in switching device 102 modulation
Normal open under the control of the signal of circuit output, the full-control type device for power switching in switching device 103 is in modulation
Under the control of the signal of circuit output, high frequency opens shutoff, the full-control type power switch device in switching device 104
Normal off under the control of the signal that part exports at modulation circuit, wherein, when the full-control type merit in switching device 101
When rate switching device is opened, the full-control type device for power switching in switching device 103 turns off, and works as switching device
When full-control type device for power switching in 101 turns off, the full-control type device for power switching in switching device 103
Open-minded；At the negative half-cycle of the signal wave that modulation circuit receives, the full-control type power in switching device 104
Under the control of the signal that switching device exports at modulation circuit, high frequency opens shutoff, complete in switching device 103
Normal open under the control of the signal that control type device for power switching exports at modulation circuit, complete in switching device 102
Under the control of the signal that control type device for power switching exports at modulation circuit, high frequency opens shutoff, switching device
Normal off under the control of the signal that the full-control type device for power switching in 101 exports at modulation circuit, wherein, when
Full-control type power when full-control type device for power switching in switching device 104 is opened, in switching device 102
Switching device turns off, when the full-control type device for power switching in switching device 104 turns off, and switching device 102
In full-control type device for power switching open-minded.
Use shown in Fig. 1 T-shaped tri-level inversion topology three-phase tri-level inverter circuit as in figure 2 it is shown,
In Fig. 2, A phase three-level inverter circuit includes switching device Q1_A, switching device Q2_A, switching device
Q3_A and switching device Q4_A, B phase three-level inverter circuit includes switching device Q1_B, switching device
Q2_B, switching device Q3_B and switching device Q4_B, C phase three-level inverter circuit includes switching device
Q1_C, switching device Q2_C, switching device Q3_C and switching device Q4_C, the three-phase shown in Fig. 2
Three-level inverter circuit depends on the midpoint effect that electric capacity C1 and electric capacity C2 series connection produces, and capacitances in series gesture
Bus equivalent capacity capacity must be caused to decline, in some occasion that bus capacitor capacity is required, such as photovoltaic
The low-voltage crossing of inverter, or the retention time in ups system, it is necessary in positive bus-bar DC+ and negative busbar
Between DC-, more electric capacity in parallel is to improve the capacity of bus capacitor, and this can improve the cost of bus capacitor.
In sum, current three-phase tri-level inverter circuit depends on series connection between positive bus-bar and negative busbar
The midpoint that electric capacity produces, and the equivalent capacity that capacitances in series can cause bus capacitor reduces, this at some to mother
The occasion that line capacitance capacity requires can improve the cost of bus capacitor in inverter circuit.
Summary of the invention
Embodiments provide a kind of three-phase tri-level inverter circuit and uninterrupted power source, in order to solve mesh
Front three-phase tri-level inverter circuit depends on the midpoint that between positive bus-bar and negative busbar, the electric capacity of series connection produces,
And capacitances in series can cause equivalent capacity to reduce, this can improve the bus electricity in inverter circuit in some occasion
The problem of the cost held.
First aspect, it is provided that a kind of three-phase tri-level inverter circuit, including the first switch element, second switch
Unit, the 3rd switch element, the 4th switch element, the 5th switch element, the 6th switch element, the 7th open
Close unit, the 8th switch element, the 9th switch element and control unit；
Described first switch element and described 4th switch element are connected on positive direct-current bus and negative dc bus
Between；Described first switch element is the A in three-phase electricity with the voltage of the junction point of described 4th switch element
The voltage of phase；
Described second switch unit and described 5th switch element are connected on positive direct-current bus and negative dc bus
Between；Described second switch unit is the B in three-phase electricity with the voltage of the junction point of described 5th switch element
The voltage of phase；
Described 3rd switch element and described 6th switch element are connected on positive direct-current bus and negative dc bus
Between；Described 3rd switch element is the C in three-phase electricity with the voltage of the junction point of described 6th switch element
The voltage of phase；
Described 7th switch element is connected to the connection of described first switch element and described 4th switch element
Between point and the junction point of described second switch unit and described 5th switch element, described 8th switch element
It is connected to described second switch unit and the junction point of described 5th switch element and described 3rd switch element
And between the junction point of described 6th switch element, it is single that described 9th switch element is connected to described 3rd switch
First junction point with described 6th switch element and described first switch element and described 4th switch element
Between junction point；
Described control unit, is used for when described first switch element and described 4th switch element are turned off,
Control described 7th switch element open-minded；And all close at described second switch unit and described 5th switch element
Time disconnected, control described 8th switch element open-minded；And at described 3rd switch element and described 6th switch
When unit is turned off, control described 9th switch element open-minded.
In conjunction with first aspect, in the implementation that the first is possible, described control unit is additionally operable to:
When described first switch element or described 4th switch element are opened, control described 7th switch element
Turn off；And when described second switch unit or described 5th switch element are opened, control described 8th switch
Unit turns off；And when described 3rd switch element or described 6th switch element are opened, control described
Nine switch elements turn off；
Wherein, each two switch element in the switch element being joined directly together with positive direct-current bus receive from
The control signal of described control unit phase difference in power frequency period is 2 π/3；Described first switch element connects
Receive the control signal from described control unit, and described 4th switch element receives from described control
The control signal of unit phase difference in power frequency period is π；Described second switch unit receives from institute
State the control signal of control unit, and described 5th switch element receives the control from described control unit
Signal phase difference in power frequency period is π；Described 3rd switch element receives from described control unit
Control signal, and described 6th switch element receives the control signal from described control unit in power frequency
Phase difference in cycle is π；The control signal use from described control unit that one switch element receives
Switch between opening and turning off in controlling this switch element.
In conjunction with the first possible implementation of first aspect or first aspect, in the reality that the second is possible
In existing mode, described first switch element, described second switch unit, described 3rd switch element, described
4th switch element, described 5th switch element and described 6th switch element include respectively one first controlled
Switching tube and first diode；
For described first switch element, described second switch unit, described 3rd switch element, described
A switch element in four switch elements, described 5th switch element and described 6th switch element, this is opened
The control end closing the first controlled tr tube in unit connects described control unit, first in this switch element
Diode is connected in the first controlled tr tube in this switch element between the two ends in addition to controlling end；Should
In the first controlled tr tube in switch element, the two ends in addition to controlling end are respectively the two of this switch element
End；
The negative electrode of the first diode in the switch element being joined directly together with described positive direct-current bus is connected described
Positive direct-current bus, the anode of the first diode in the switch element being joined directly together with described negative dc bus is even
Connect described negative dc bus.
In conjunction with the first possible implementation of first aspect or first aspect, in the reality that the third is possible
In existing mode, described 7th switch element, described 8th switch element and described 9th switch element wrap respectively
Include second gate-controlled switch, the 3rd gate-controlled switch, second diode and the 3rd diode；
For one in described 7th switch element, described 8th switch element and described 9th switch element
Switch element, the control end controlling end and the 3rd gate-controlled switch of the second gate-controlled switch in this switch element divides
Not connecting described control unit, the second diode in this switch element is connected to second in this switch element
Except controlling between the two ends in addition to end in gate-controlled switch, the 3rd diode in this switch element is connected to this and opens
Close in the 3rd gate-controlled switch in unit to go out between the two ends controlled beyond end；
The negative electrode of the second diode in described 7th switch element connects described first switch element with described
The junction point of the 4th switch element, the anode and the described 7th of the second diode in described 7th switch element
The anode of the 3rd diode in switch element is connected, the moon of the 3rd diode in described 7th switch element
Pole connects the junction point of described second switch unit and described 5th switch element；
The negative electrode of the second diode in described 8th switch element connects described second switch unit with described
The junction point of the 5th switch element, the anode and the described 8th of the second diode in described 8th switch element
The anode of the 3rd diode in switch element is connected, the moon of the 3rd diode in described 8th switch element
Pole connects the junction point of described 3rd switch element and described 6th switch element；
The negative electrode of the second diode in described 9th switch element connects described 3rd switch element with described
The junction point of the 6th switch element, the anode and the described 9th of the second diode in described 9th switch element
The anode of the 3rd diode in switch element is connected, the moon of the 3rd diode in described 9th switch element
Pole connects the junction point of described first switch element and described 4th switch element.
In conjunction with the first possible implementation of first aspect or first aspect, the 4th kind of possible reality
In existing mode, described 7th switch element, described 8th switch element and described 9th switch element wrap respectively
Include the 4th gate-controlled switch, the 5th gate-controlled switch, the 4th diode and the 5th diode；
For one in described 7th switch element, described 8th switch element and described 9th switch element
Switch element, the control end controlling end and the 5th gate-controlled switch of the 4th gate-controlled switch in this switch element divides
Not connecting described control unit, the 4th diode in this switch element is connected to the 4th in this switch element
Except controlling between the two ends in addition to end in gate-controlled switch, the 5th diode in this switch element is connected to this and opens
Close in the 5th gate-controlled switch in unit to go out between the two ends controlled beyond end；
The anode of the 4th diode in described 7th switch element connects described first switch element with described
The junction point of the 4th switch element, the negative electrode and the described 7th of the 4th diode in described 7th switch element
The negative electrode of the 5th diode in switch element is connected, the sun of the 5th diode in described 7th switch element
Pole connects the junction point of described second switch unit and described 5th switch element；
The anode of the 4th diode in described 8th switch element connects described second switch unit with described
The junction point of the 5th switch element, the negative electrode and the described 8th of the 4th diode in described 8th switch element
The negative electrode of the 5th diode in switch element is connected, the sun of the 5th diode in described 8th switch element
Pole connects the junction point of described 3rd switch element and described 6th switch element；
The anode of the 4th diode in described 9th switch element connects described 3rd switch element with described
The junction point of the 6th switch element, the negative electrode and the described 9th of the 4th diode in described 9th switch element
The negative electrode of the 5th diode in switch element is connected, the sun of the 5th diode in described 9th switch element
Pole connects the junction point of described first switch element and described 4th switch element.
Second aspect, it is provided that a kind of uninterrupted power source, implements including rectification circuit, DC source and the present invention
The three-phase tri-level inverter circuit that example provides；
Described rectification circuit for being converted to unidirectional current and straight by be converted to by the alternating current received
Stream electricity output is to described three-phase tri-level inverter circuit；
Described DC source, for when described rectification circuit does not receives alternating current, for described three-phase three electricity
Flat inverter circuit provides unidirectional current.
The beneficial effect of the embodiment of the present invention includes:
The three-phase tri-level inverter circuit of embodiment of the present invention offer and uninterrupted power source, owing to control unit exists
It is open-minded that first switch element and the 4th switch element can control the 7th switch element when being turned off, and
When two switch elements and the 5th switch element are turned off, it is possible to control the 8th switch element open-minded, and the
When three switch elements and the 6th switch element are turned off, it is possible to control described 9th switch element open-minded, and
When 7th switch element, the 8th switch element and the 9th switch element are all opened, the embodiment of the present invention provides
A phase voltage, B phase voltage and the C phase voltage of the output of three-phase tri-level inverter circuit are the most equal, electricity now
Pressure can be regarded as the midpoint potential of three-phase electricity, therefore, the three-phase tri-level inversion that the embodiment of the present invention provides
The midpoint potential of circuit output is without relying in the electric capacity connected between positive direct-current bus and negative dc bus
The current potential of point, it is to avoid series capacitance between positive direct-current bus and negative dc bus, thus reduce three-phase
The cost of the bus capacitor in three-level inverter circuit.
Accompanying drawing explanation
Fig. 1 is the structural representation of single-phase T three-level inverter circuit of the prior art；
The structural representation of three-phase tri-level inverter circuit when Fig. 2 is to use T-shaped inversion topological in prior art
Figure；
One of structural representation of three-phase tri-level inverter circuit that Fig. 3 provides for the embodiment of the present invention；
The three-phase tri-level inverter circuit that Fig. 4 provides for the embodiment of the present invention collude with the two of schematic diagram；
The three-phase tri-level inverter circuit that Fig. 5 provides for the embodiment of the present invention collude with the three of schematic diagram.
Detailed description of the invention
The three-phase tri-level inverter circuit of embodiment of the present invention offer and uninterrupted power source, existed by control unit
The 7th switch element is controlled open-minded when first switch element and the 4th switch element are turned off, and at second switch
Control the 8th switch element when unit and the 5th switch element are turned off open-minded, and at the 3rd switch element and
6th switch element controls described 9th switch element when being turned off open-minded, so that the embodiment of the present invention carries
A phase voltage, B phase voltage and the C phase voltage of the three-phase tri-level inverter circuit output of confession are the most equal, and this
Time voltage can be regarded as the midpoint potential of three-phase electricity, and then avoid at positive direct-current bus and negative direct current female
Series capacitance between line, reduces the cost of bus capacitor in three-phase tri-level inverter circuit.
Below in conjunction with Figure of description, a kind of three-phase tri-level inverter circuit that the embodiment of the present invention is provided and
The detailed description of the invention of uninterrupted power source illustrates.
A kind of three-phase tri-level inverter circuit that the embodiment of the present invention provides, as it is shown on figure 3, include that first opens
Close unit 31, second switch unit the 32, the 3rd switch element the 33, the 4th switch element the 34, the 5th switch
Unit the 35, the 6th switch element the 36, the 7th switch element the 37, the 8th switch element the 38, the 9th switch is single
Unit 39 and control unit 310；
First switch element 31 and the 4th switch element 34 are connected on positive direct-current bus BUS+ and negative direct current is female
Between line BUS-；The voltage of the junction point of the first switch element 31 and the 4th switch element 34 is three-phase electricity
In the voltage of A phase；
Second switch unit 32 and the 5th switch element 35 are connected on positive direct-current bus BUS+ and negative direct current is female
Between line BUS-；The voltage of the junction point of second switch unit 32 and the 5th switch element 35 is three-phase electricity
In the voltage of B phase；
3rd switch element 33 and the 6th switch element 36 are connected on positive direct-current bus BUS+ and negative direct current is female
Between line BUS-；The voltage of the junction point of the 3rd switch element 33 and the 6th switch element 36 is three-phase electricity
In the voltage of C phase；
7th switch element 37 be connected to the first switch element 31 and the junction point of the 4th switch element 34 and
Between second switch unit 32 and the junction point of the 5th switch element 35, the 8th switch element 38 is connected to
Second switch unit 32 and the junction point of the 5th switch element 35 and the 3rd switch element 33 and the 6th switch
Between the junction point of unit 36, the 9th switch element 39 is connected to the 3rd switch element 33 and the 6th switch
Between junction point and the first switch element 31 and the junction point of the 4th switch element 34 of unit 36；
Control unit 310, for when the first switch element 31 and the 4th switch element 34 are turned off, controls
Make the 7th switch element 37 open-minded；And when second switch unit 32 and the 5th switch element 35 are turned off,
Control the 8th switch element 38 open-minded；And all close at the 3rd switch element 33 and the 6th switch element 36
Time disconnected, control the 9th switch element 39 open-minded.
Alternatively, control unit 310 is additionally operable to, and opens at the first switch element 31 or the 4th switch element 34
Time logical, control the 7th switch element 37 and turn off；And at second switch unit 32 or the 5th switch element 35
When opening, control the 8th switch element 38 and turn off；And at the 3rd switch element 33 or the 6th switch element
36 when opening, and controls the 9th switch element and turns off；
Wherein, each two switch element in the switch element being joined directly together with positive direct-current bus BUS+ receives
It is 2 π/3 to the phase difference in power frequency period of the control signal from control unit 310；Refer to and positive direct-current
A switch element high frequency in any two switch element in the switch element that bus BUS+ is joined directly together
The initial time of on/off is t1, then the initial time of another switch element high frequency on/off is
t1±20/3ms；Or, any two in the switch element being joined directly together with positive direct-current bus BUS+ is opened
It is t1 that a switch element in the unit of pass turns off the initial time of (persistent period is 10ms) for a long time,
So another switch element turns off the initial time of (persistent period is 10ms) for a long time is t1 ± 20/3ms.
Therefore, in the switch element that synchronization and positive direct-current bus are joined directly together, at least a switch element closes
Disconnected.
The switch element being joined directly together with positive direct-current bus BUS+ in Fig. 3 is the first switch element 31, second
Switch element 32 and the 3rd switch element 33.
First switch element 31 receives the control signal from control unit 310, and the 4th switch element
34 to receive the phase difference in power frequency period of the control signal from control unit 310 be π；Refer to when the
During one switch element 31 high frequency on/off, the 4th switch element 34 turns off that (persistent period is for a long time
10ms), when the first switch element 31 turns off (persistent period is 10ms) for a long time, the 4th switch is single
Unit's 34 high frequency on/off.Therefore, synchronization, the first switch element 31 and the 4th switch element 34
In a be up to switch element open-minded.
Second switch unit 32 receives the control signal from control unit 310, and the 5th switch element
35 to receive the phase difference in power frequency period of the control signal from control unit 310 be π；Refer to when the
During two switch element 32 high frequency on/off, the 5th switch element 35 turns off that (persistent period is for a long time
10ms), when second switch unit 32 turns off (persistent period is 10ms) for a long time, the 5th switch is single
Unit's 35 high frequency on/off.Therefore, synchronization, second switch unit 32 and the 5th switch element 35
In a be up to switch element open-minded.
3rd switch element 33 receives the control signal from control unit 310, and the 6th switch element
36 to receive the phase difference in power frequency period of the control signal from control unit 310 be π；Refer to when the
During three switch element 33 high frequency on/off, the 6th switch element 36 turns off that (persistent period is for a long time
10ms), when the 3rd switch element 33 turns off (persistent period is 10ms) for a long time, the 6th switch is single
Unit's 36 high frequency on/off.Therefore, synchronization, the 3rd switch element 33 and the 6th switch element 36
In a be up to switch element open-minded.
Wherein, the control signal from control unit 310 that switch element receives is opened for controlling this
Close unit to switch between opening and turning off.
According to the above description, it can be deduced that in figure 3, if the first switch element 31 is opened, the 4th open
Closing unit 34 shutoff to represent with " 1 ", the first switch element 31 turns off, the 4th switch element 34 opens use
" 0 " represents, the first switch element 31 and the 4th switch element 34 are turned off representing with " X "；Second opens
Close that unit 32 is opened, the 5th switch element 35 turns off and represents with " 1 ", second switch unit 32 turns off,
5th switch element 35 is opened use " 0 " and is represented, second switch unit 31 and the 5th switch element 35 all close
Disconnected with " X " expression；3rd switch element 33 is opened, the 6th switch element 36 turns off and represents with " 1 ",
3rd switch element 33 turns off, the 6th switch element 36 is opened use " 0 " and represented, the 3rd switch element 33
It is turned off representing with " X " with the 6th switch element 36；So, three-phase three electricity that the embodiment of the present invention provides
The first switch element 31 in flat inverter circuit, second switch unit the 32, the 3rd switch element the 33, the 4th
The state of switch element the 34, the 5th switch element 35 and the 6th switch element 36 in (110), (101),
(100)、(10X)、(1X0)、(011)、(010)、(01X)、(001)、(0X1)、(X10)、
(X01), switch between (XXX).Wherein, first in each bracket is the first switch element 31
With the state of the 4th switch element 34, the second in each bracket is that second switch unit 32 and the 5th is opened
Closing the state of unit 35, the 3rd in each bracket is the 3rd switch element 33 and the 6th switch element 36
State.
Alternatively, described first switch element, described second switch unit, described 3rd switch element, institute
State the 4th switch element, described 5th switch element and described 6th switch element include respectively one first can
Control switching tube and first diode；
For described first switch element, described second switch unit, described 3rd switch element, described
A switch element in four switch elements, described 5th switch element and described 6th switch element, this is opened
The control end closing the first controlled tr tube in unit connects described control unit, first in this switch element
Diode is connected in the first controlled tr tube in this switch element between the two ends in addition to controlling end；Should
In the first controlled tr tube in switch element, the two ends in addition to controlling end are respectively the two of this switch element
End；
The negative electrode of the first diode in the switch element being joined directly together with described positive direct-current bus is connected described
Positive direct-current bus, the anode of the first diode in the switch element being joined directly together with described negative dc bus is even
Connect described negative dc bus.
As shown in Fig. 4 or Fig. 5, the first switch element includes the first controlled tr tube 31T1 and the one or two pole
The control end of pipe 31D1, the first controlled tr tube 31T1 connects control unit 310, the first diode 31D1
It is connected in the first controlled tr tube 31T1 between the two ends in addition to controlling end, the first diode 31D1
Negative electrode connect positive direct-current bus BUS+, the first controlled tr tube 31T1 divides except controlling the two ends in addition to end
It is not the two ends of the first switch element.Second switch unit includes the first controlled tr tube 32T1 and the one or two
The control end of pole pipe 32D1, the first controlled tr tube 32T1 connects control unit 310, the first diode 32D1
It is connected in the first controlled tr tube 32T1 between the two ends in addition to controlling end, the first diode 32D1
Negative electrode connect positive direct-current bus BUS+, the first controlled tr tube 32T1 divides except controlling the two ends in addition to end
Wei the two ends of second switch unit.3rd switch element includes the first controlled tr tube 33T1 and the one or two
The control end of pole pipe 33D1, the first controlled tr tube 33T1 connects control unit 310, the first diode 33D1
It is connected in the first controlled tr tube 33T1 between the two ends in addition to controlling end, the first diode 33D1
Negative electrode connect positive direct-current bus BUS+, the first controlled tr tube 33T1 divides except controlling the two ends in addition to end
It is not the two ends of the 3rd switch element.
As shown in Fig. 4 or Fig. 5, the 4th switch element includes the first controlled tr tube 34T1 and the one or two pole
The control end of pipe 34D1, the first controlled tr tube 34T1 connects control unit 310, the first diode 34D1
It is connected in the first controlled tr tube 34T1 between the two ends in addition to controlling end, the first diode 34D1
Anode even negative dc bus BUS-, in the first controlled tr tube 34T1, the two ends in addition to controlling end are distinguished
It is the two ends of the 4th switch element.5th switch element includes the first controlled tr tube 35T1 and the one or two pole
The control end of pipe 35D1, the first controlled tr tube 35T1 connects control unit 310, the first diode 35D1
It is connected in the first controlled tr tube 35T1 between the two ends in addition to controlling end, the first diode 35D1
Anode even negative dc bus BUS-, in the first controlled tr tube 35T1, the two ends in addition to controlling end are distinguished
It is the two ends of the 5th switch element.6th switch element includes the first controlled tr tube 36T1 and the one or two pole
The control end of pipe 36D1, the first controlled tr tube 36T1 connects control unit 310, the first diode 36D1
It is connected in the first controlled tr tube 36T1 between the two ends in addition to controlling end, the first diode 36D1
Anode even negative dc bus BUS-, in the first controlled tr tube 36T1, the two ends in addition to controlling end are distinguished
It is the two ends of the 6th switch element.
Alternatively, described 7th switch element, described 8th switch element and described 9th switch element are respectively
Including second gate-controlled switch, the 3rd gate-controlled switch, second diode and the three or two pole
Pipe；
For one in described 7th switch element, described 8th switch element and described 9th switch element
Switch element, the control end controlling end and the 3rd gate-controlled switch of the second gate-controlled switch in this switch element divides
Not connecting described control unit, the second diode in this switch element is connected to second in this switch element
Except controlling between the two ends in addition to end in gate-controlled switch, the 3rd diode in this switch element is connected to this and opens
Close in the 3rd gate-controlled switch in unit to go out between the two ends controlled beyond end；
The negative electrode of the second diode in described 7th switch element connects described first switch element with described
The junction point of the 4th switch element, the anode and the described 7th of the second diode in described 7th switch element
The anode of the 3rd diode in switch element is connected, the moon of the 3rd diode in described 7th switch element
Pole connects the junction point of described second switch unit and described 5th switch element；
As shown in Figure 4, the 7th switch element include the second gate-controlled switch 37T2, the 3rd gate-controlled switch 37T3,
Second diode 37D2 and the 3rd diode 37D3；Wherein, the control end of the second gate-controlled switch 37T2 and
The control end of the 3rd gate-controlled switch 37T3 connects control unit 310 respectively, and the second diode 37D2 is connected to
Except controlling between the two ends in addition to end in second gate-controlled switch 37T2；3rd diode 37D3 is connected to
Except controlling between the two ends in addition to end in three gate-controlled switch 37T3；The negative electrode of the second diode 37D2 connects
First switch element 31 and the junction point of the 4th switch element 34, the anode of the second diode 37D2 connects
The anode of the 3rd diode 37D3, the negative electrode of the 3rd diode 37D3 connects second switch unit 32 and the
The junction point of five switch elements 35.
Now, when opening due in the first switch element and the 4th switch element, the 7th switch element
Turning off, only when the first switch element and the 4th switch element are turned off, the 7th switch element is the most open-minded；
Therefore, when the first switch element is opened, the second gate-controlled switch 37T2 in the 7th switch element turns off, the
When one switch element turns off, the second gate-controlled switch 37T2 in the 7th switch element is open-minded；4th switch is single
When unit opens, the 3rd gate-controlled switch 37T3 in the 7th switch element turns off, when the 4th switch element turns off,
The 3rd gate-controlled switch 37T3 in 7th switch element is open-minded.
The negative electrode of the second diode in described 8th switch element connects described second switch unit with described
The junction point of the 5th switch element, the anode and the described 8th of the second diode in described 8th switch element
The anode of the 3rd diode in switch element is connected, the moon of the 3rd diode in described 8th switch element
Pole connects the junction point of described 3rd switch element and described 6th switch element；
As shown in Figure 4, the 8th switch element include the second gate-controlled switch 38T2, the 3rd gate-controlled switch 38T3,
Second diode 38D2 and the 3rd diode 38D3；Wherein, the control end of the second gate-controlled switch 38T2 and
The control end of the 3rd gate-controlled switch 38T3 connects control unit 310 respectively, and the second diode 38D2 is connected to
Except controlling between the two ends in addition to end in second gate-controlled switch 38T2；3rd diode 38D3 is connected to
Except controlling between the two ends in addition to end in three gate-controlled switch 38T3；The negative electrode of the second diode 38D2 connects
Second switch unit 32 and the junction point of the 5th switch element 35, the anode of the second diode 38D2 connects
The anode of the 3rd diode 38D3, the negative electrode of the 3rd diode 38D3 connects the 3rd switch element 33 and the
The junction point of six switch elements 36.
Now, when opening due in second switch unit and the 5th switch element, the 8th switch element
Turning off, only when second switch unit and the 5th switch element are turned off, the 8th switch element is the most open-minded；
Therefore, when second switch unit is opened, the second gate-controlled switch 38T2 in the 8th switch element turns off, the
When two switch elements turn off, the second gate-controlled switch 38T2 in the 8th switch element is open-minded；5th switch is single
When unit opens, the 3rd gate-controlled switch 38T3 in the 8th switch element turns off, when the 5th switch element turns off,
The 3rd gate-controlled switch 38T3 in 8th switch element is open-minded.
The negative electrode of the second diode in described 9th switch element connects described 3rd switch element with described
The junction point of the 6th switch element, the anode and the described 9th of the second diode in described 9th switch element
The anode of the 3rd diode in switch element is connected, the moon of the 3rd diode in described 9th switch element
Pole connects the junction point of described first switch element and described 4th switch element；
As shown in Figure 4, the 9th switch element include the second gate-controlled switch 39T2, the 3rd gate-controlled switch 39T3,
Second diode 39D2 and the 3rd diode 39D3；Wherein, the control end of the second gate-controlled switch 39T2 and
The control end of the 3rd gate-controlled switch 39T3 connects control unit 310 respectively, and the second diode 39D2 is connected to
Except controlling between the two ends in addition to end in second gate-controlled switch 39T2；3rd diode 39D3 is connected to
Except controlling between the two ends in addition to end in three gate-controlled switch 39T3；The negative electrode of the second diode 39D2 connects
3rd switch element 33 and the junction point of the 6th switch element 36, the anode of the second diode 39D2 connects
The anode of the 3rd diode 39D3, the negative electrode of the 3rd diode 39D3 connects the first switch element 31 and
The junction point of four switch elements 34.
Now, when opening due in the 3rd switch element and the 6th switch element, the 9th switch element
Turning off, only when the 3rd switch element and the 6th switch element are turned off, the 9th switch element is the most open-minded；
Therefore, when the 3rd switch element is opened, the second gate-controlled switch 39T2 in the 9th switch element turns off, the
When three switch elements turn off, the second gate-controlled switch 39T2 in the 9th switch element is open-minded；6th switch is single
When unit opens, the 3rd gate-controlled switch 39T3 in the 9th switch element turns off, when the 6th switch element turns off,
The 3rd gate-controlled switch 39T3 in 9th switch element is open-minded.
Alternatively, described 7th switch element, described 8th switch element and described 9th switch element are respectively
Including the 4th gate-controlled switch, the 5th gate-controlled switch, the 4th diode and the five or two pole
Pipe；
For one in described 7th switch element, described 8th switch element and described 9th switch element
Switch element, the control end controlling end and the 5th gate-controlled switch of the 4th gate-controlled switch in this switch element divides
Not connecting described control unit, the 4th diode in this switch element is connected to the 4th in this switch element
Except controlling between the two ends in addition to end in gate-controlled switch, the 5th diode in this switch element is connected to this and opens
Close in the 5th gate-controlled switch in unit to go out between the two ends controlled beyond end；
The anode of the 4th diode in described 7th switch element connects described first switch element with described
The junction point of the 4th switch element, the negative electrode and the described 7th of the 4th diode in described 7th switch element
The negative electrode of the 5th diode in switch element is connected, the sun of the 5th diode in described 7th switch element
Pole connects the junction point of described second switch unit and described 5th switch element；
As it is shown in figure 5, the 7th switch element include the 4th gate-controlled switch 37T4, the 5th gate-controlled switch 37T5,
4th diode 37D4 and the 5th diode 37D5；Wherein, the control end of the 4th gate-controlled switch 37T4 and
The control end of the 5th gate-controlled switch 37T5 connects control unit 310 respectively, and the 4th diode 37D4 is connected to
Except controlling between the two ends in addition to end in 4th gate-controlled switch 37T4；5th diode 37D5 is connected to
Except controlling between the two ends in addition to end in five gate-controlled switch 37T5；The anode of the 4th diode 37D4 connects
First switch element 31 and the junction point of the 4th switch element 34, the negative electrode of the 4th diode 37D4 connects
The negative electrode of the 5th diode 37D5, the anode of the 5th diode 37D5 connects second switch unit 32 and the
The junction point of five switch elements 35.
Now, when opening due in the first switch element and the 4th switch element, the 7th switch element
Turning off, only when the first switch element and the 4th switch element are turned off, the 7th switch element is the most open-minded；
Therefore, when the first switch element is opened, the 5th gate-controlled switch 37T5 in the 7th switch element turns off, the
When one switch element turns off, the 5th gate-controlled switch 37T5 in the 7th switch element is open-minded；4th switch is single
When unit opens, the 4th gate-controlled switch 37T4 in the 7th switch element turns off, when the 4th switch element turns off,
The 4th gate-controlled switch 37T4 in 7th switch element is open-minded.
The anode of the 4th diode in described 8th switch element connects described second switch unit with described
The junction point of the 5th switch element, the negative electrode and the described 8th of the 4th diode in described 8th switch element
The negative electrode of the 5th diode in switch element is connected, the sun of the 5th diode in described 8th switch element
Pole connects the junction point of described 3rd switch element and described 6th switch element；
As it is shown in figure 5, the 8th switch element include the 4th gate-controlled switch 38T4, the 5th gate-controlled switch 38T5,
4th diode 38D4 and the 5th diode 38D5；Wherein, the control end of the 4th gate-controlled switch 38T4 and
The control end of the 5th gate-controlled switch 38T5 connects control unit 310 respectively, and the 4th diode 38D4 is connected to
Except controlling between the two ends in addition to end in 4th gate-controlled switch 38T4；5th diode 38D5 is connected to
Except controlling between the two ends in addition to end in five gate-controlled switch 38T5；The anode of the 4th diode 38D4 connects
Second switch unit 32 and the junction point of the 5th switch element 35, the negative electrode of the 4th diode 38D4 connects
The negative electrode of the 5th diode 38D5, the anode of the 5th diode 38D5 connects the 3rd switch element 33 and the
The junction point of six switch elements 36.
Now, when opening due in second switch unit and the 5th switch element, the 8th switch element
Turning off, only when second switch unit and the 5th switch element are turned off, the 8th switch element is the most open-minded；
Therefore, when second switch unit is opened, the 5th gate-controlled switch 38T5 in the 8th switch element turns off, the
When two switch elements turn off, the 5th gate-controlled switch 38T5 in the 8th switch element is open-minded；5th switch is single
When unit opens, the 4th gate-controlled switch 38T4 in the 8th switch element turns off, when the 5th switch element turns off,
The 4th gate-controlled switch 38T4 in 8th switch element is open-minded.
The anode of the 4th diode in described 9th switch element connects described 3rd switch element with described
The junction point of the 6th switch element, the negative electrode and the described 9th of the 4th diode in described 9th switch element
The negative electrode of the 5th diode in switch element is connected, the sun of the 5th diode in described 9th switch element
Pole connects the junction point of described first switch element and described 4th switch element；
As it is shown in figure 5, the 9th switch element include the 4th gate-controlled switch 39T4, the 5th gate-controlled switch 39T5,
4th diode 39D4 and the 5th diode 39D5；Wherein, the control end of the 4th gate-controlled switch 39T4 and
The control end of the 5th gate-controlled switch 39T5 connects control unit 310 respectively, and the 4th diode 39D4 is connected to
Except controlling between the two ends in addition to end in 4th gate-controlled switch 39T4；5th diode 39D5 is connected to
Except controlling between the two ends in addition to end in five gate-controlled switch 39T5；The anode of the 4th diode 39D4 connects
3rd switch element 33 and the junction point of the 6th switch element 36, the negative electrode of the 4th diode 39D4 connects
The negative electrode of the 5th diode 39D5, the anode of the 5th diode 39D5 connects the first switch element 31 and
The junction point of four switch elements 34.
Now, when opening due in the 3rd switch element and the 6th switch element, the 9th switch element
Turning off, only when the 3rd switch element and the 6th switch element are turned off, the 9th switch element is the most open-minded；
Therefore, when the 3rd switch element is opened, the 5th gate-controlled switch 39T5 in the 9th switch element turns off, the
When three switch elements turn off, the 5th gate-controlled switch 39T5 in the 9th switch element is open-minded；6th switch is single
When unit opens, the 4th gate-controlled switch 39T4 in the 9th switch element turns off, when the 6th switch element turns off,
The 4th gate-controlled switch 39T4 in 9th switch element is open-minded.
Above-mentioned the first gate-controlled switch, the second gate-controlled switch, the 3rd gate-controlled switch, the 4th gate-controlled switch and
Five gate-controlled switches can be the gate-controlled switch devices such as IGBT, MOSFET.
The uninterrupted power source that the embodiment of the present invention provides, implements including rectification circuit, DC source and the present invention
The three-phase tri-level inverter circuit that example provides；Described rectification circuit, for being converted to the alternating current received
Unidirectional current, and the unidirectional current being converted to is exported to described three-phase tri-level inverter circuit；Described unidirectional current
Source, for when described rectification circuit does not receives alternating current, provides for described three-phase tri-level inverter circuit
Unidirectional current.
Through the above description of the embodiments, those skilled in the art is it can be understood that arrive the present invention
Embodiment can be realized by hardware, it is also possible to the mode of the general hardware platform adding necessity by software is come real
Existing.Based on such understanding, the technical scheme of the embodiment of the present invention can embody with the form of software product
Come, this software product can be stored in a non-volatile memory medium (can be CD-ROM, USB flash disk,
Portable hard drive etc.) in, including some instructions with so that computer equipment (can be personal computer,
Server, or the network equipment etc.) perform the method described in each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the mould in accompanying drawing
Block or flow process are not necessarily implemented necessary to the present invention.
It will be appreciated by those skilled in the art that the module in the device in embodiment can describe according to embodiment
Carry out being distributed in the device of embodiment, it is also possible to carry out respective change and be disposed other than one of the present embodiment
Or in multiple device.The module of above-described embodiment can merge into a module, it is also possible to is further split into
Multiple submodules.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention
Bright spirit and scope.So, if the present invention these amendment and modification belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprise these change and modification.
Claims (6)
1. a three-phase tri-level inverter circuit, it is characterised in that include the first switch element, second open
Close unit, the 3rd switch element, the 4th switch element, the 5th switch element, the 6th switch element, the 7th
Switch element, the 8th switch element, the 9th switch element and control unit；
Described first switch element and described 4th switch element are connected on positive direct-current bus and negative dc bus
Between；Described first switch element is the A in three-phase electricity with the voltage of the junction point of described 4th switch element
The voltage of phase；
Described second switch unit and described 5th switch element are connected on positive direct-current bus and negative dc bus
Between；Described second switch unit is the B in three-phase electricity with the voltage of the junction point of described 5th switch element
The voltage of phase；
Described 3rd switch element and described 6th switch element are connected on positive direct-current bus and negative dc bus
Between；Described 3rd switch element is the C in three-phase electricity with the voltage of the junction point of described 6th switch element
The voltage of phase；
Described 7th switch element is connected to the connection of described first switch element and described 4th switch element
Between point and the junction point of described second switch unit and described 5th switch element, described 8th switch element
It is connected to described second switch unit and the junction point of described 5th switch element and described 3rd switch element
And between the junction point of described 6th switch element, it is single that described 9th switch element is connected to described 3rd switch
First junction point with described 6th switch element and described first switch element and described 4th switch element
Between junction point；
Described control unit, is used for when described first switch element and described 4th switch element are turned off,
Control described 7th switch element open-minded；And all close at described second switch unit and described 5th switch element
Time disconnected, control described 8th switch element open-minded；And at described 3rd switch element and described 6th switch
When unit is turned off, control described 9th switch element open-minded.
2. three-phase tri-level inverter circuit as claimed in claim 1, it is characterised in that described control list
Unit is additionally operable to:
When described first switch element or described 4th switch element are opened, control described 7th switch element
Turn off；And when described second switch unit or described 5th switch element are opened, control described 8th switch
Unit turns off；And when described 3rd switch element or described 6th switch element are opened, control described
Nine switch elements turn off；
Wherein, each two switch element in the switch element being joined directly together with positive direct-current bus receive from
The control signal of described control unit phase difference in power frequency period is 2 π/3；Described first switch element connects
Receive the control signal from described control unit, and described 4th switch element receives from described control
The control signal of unit phase difference in power frequency period is π；Described second switch unit receives from institute
State the control signal of control unit, and described 5th switch element receives the control from described control unit
Signal phase difference in power frequency period is π；Described 3rd switch element receives from described control unit
Control signal, and described 6th switch element receives the control signal from described control unit in power frequency
Phase difference in cycle is π；The control signal use from described control unit that one switch element receives
Switch between opening and turning off in controlling this switch element.
3. three-phase tri-level inverter circuit as claimed in claim 1 or 2, it is characterised in that described the
One switch element, described second switch unit, described 3rd switch element, described 4th switch element, institute
State the 5th switch element and described 6th switch element includes first controlled tr tube and one respectively
One diode；
For described first switch element, described second switch unit, described 3rd switch element, described
A switch element in four switch elements, described 5th switch element and described 6th switch element, this is opened
The control end closing the first controlled tr tube in unit connects described control unit, first in this switch element
Diode is connected in the first controlled tr tube in this switch element between the two ends in addition to controlling end；Should
In the first controlled tr tube in switch element, the two ends in addition to controlling end are respectively the two of this switch element
End；
The negative electrode of the first diode in the switch element being joined directly together with described positive direct-current bus is connected described
Positive direct-current bus, the anode of the first diode in the switch element being joined directly together with described negative dc bus is even
Connect described negative dc bus.
4. three-phase tri-level inverter circuit as claimed in claim 1 or 2, it is characterised in that described the
Seven switch elements, described 8th switch element and described 9th switch element include that one second controlled is opened respectively
Pass, the 3rd gate-controlled switch, second diode and the 3rd diode；
For one in described 7th switch element, described 8th switch element and described 9th switch element
Switch element, the control end controlling end and the 3rd gate-controlled switch of the second gate-controlled switch in this switch element divides
Not connecting described control unit, the second diode in this switch element is connected to second in this switch element
Except controlling between the two ends in addition to end in gate-controlled switch, the 3rd diode in this switch element is connected to this and opens
Close in the 3rd gate-controlled switch in unit to go out between the two ends controlled beyond end；
The negative electrode of the second diode in described 7th switch element connects described first switch element with described
The junction point of the 4th switch element, the anode and the described 7th of the second diode in described 7th switch element
The anode of the 3rd diode in switch element is connected, the moon of the 3rd diode in described 7th switch element
Pole connects the junction point of described second switch unit and described 5th switch element；
The negative electrode of the second diode in described 8th switch element connects described second switch unit with described
The junction point of the 5th switch element, the anode and the described 8th of the second diode in described 8th switch element
The anode of the 3rd diode in switch element is connected, the moon of the 3rd diode in described 8th switch element
Pole connects the junction point of described 3rd switch element and described 6th switch element；
The negative electrode of the second diode in described 9th switch element connects described 3rd switch element with described
The junction point of the 6th switch element, the anode and the described 9th of the second diode in described 9th switch element
The anode of the 3rd diode in switch element is connected, the moon of the 3rd diode in described 9th switch element
Pole connects the junction point of described first switch element and described 4th switch element.
5. three-phase tri-level inverter circuit as claimed in claim 1 or 2, it is characterised in that described the
Seven switch elements, described 8th switch element and described 9th switch element include that one the 4th controlled is opened respectively
Pass, the 5th gate-controlled switch, the 4th diode and the 5th diode；
For one in described 7th switch element, described 8th switch element and described 9th switch element
Switch element, the control end controlling end and the 5th gate-controlled switch of the 4th gate-controlled switch in this switch element divides
Not connecting described control unit, the 4th diode in this switch element is connected to the 4th in this switch element
Except controlling between the two ends in addition to end in gate-controlled switch, the 5th diode in this switch element is connected to this and opens
Close in the 5th gate-controlled switch in unit to go out between the two ends controlled beyond end；
The anode of the 4th diode in described 7th switch element connects described first switch element with described
The junction point of the 4th switch element, the negative electrode and the described 7th of the 4th diode in described 7th switch element
The negative electrode of the 5th diode in switch element is connected, the sun of the 5th diode in described 7th switch element
Pole connects the junction point of described second switch unit and described 5th switch element；
The anode of the 4th diode in described 8th switch element connects described second switch unit with described
The junction point of the 5th switch element, the negative electrode and the described 8th of the 4th diode in described 8th switch element
The negative electrode of the 5th diode in switch element is connected, the sun of the 5th diode in described 8th switch element
Pole connects the junction point of described 3rd switch element and described 6th switch element；
The anode of the 4th diode in described 9th switch element connects described 3rd switch element with described
The junction point of the 6th switch element, the negative electrode and the described 9th of the 4th diode in described 9th switch element
The negative electrode of the 5th diode in switch element is connected, the sun of the 5th diode in described 9th switch element
Pole connects the junction point of described first switch element and described 4th switch element.
6. a uninterrupted power source, it is characterised in that include rectification circuit, DC source and as right want
Seek 1～5 arbitrary described three-phase tri-level inverter circuits；
Described rectification circuit for being converted to unidirectional current and straight by be converted to by the alternating current received
Stream electricity output is to described three-phase tri-level inverter circuit；
Described DC source, for when described rectification circuit does not receives alternating current, for described three-phase three electricity
Flat inverter circuit provides unidirectional current.
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| CN104753140A (en) * | 2015-04-07 | 2015-07-01 | 佛山市柏克新能科技股份有限公司 | Double-T-shaped three-level online UPS (uninterrupted power supply) |
| CN105071524B (en) * | 2015-08-10 | 2018-01-09 | 佛山市柏克新能科技股份有限公司 | Ups power control system |
| CN105305861B (en) * | 2015-10-26 | 2019-04-30 | 东南大学 | A kind of cascaded multilevel inverter |
| CN105720844B (en) * | 2016-04-22 | 2018-07-17 | 西安交通大学 | A kind of more level HVDC transverters of Three phase serial module structureization |
| JP2023530150A (en) * | 2020-06-19 | 2023-07-13 | ファーウェイ デジタル パワー テクノロジーズ カンパニー リミテッド | Motor control unit, control method, and power assembly |
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| CN1808832A (en) * | 2005-01-19 | 2006-07-26 | 中兴通讯股份有限公司 | Circuit apparatus applicable to middle and high power UPS |
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| US20110222325A1 (en) * | 2010-03-15 | 2011-09-15 | Fuji Electric Holdings Co., Ltd. | Semiconductor device |
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Effective date of registration: 20211104 Address after: 518043 No. 01, 39th floor, building a, antuoshan headquarters building, No. 33, antuoshan Sixth Road, Xiang'an community, Xiangmihu street, Futian District, Shenzhen, Guangdong Province Patentee after: Huawei Digital Energy Technology Co.,Ltd. Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: HUAWEI TECHNOLOGIES Co.,Ltd. |