CN106329932B - A kind of control method and device of DC converter - Google Patents
A kind of control method and device of DC converter Download PDFInfo
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- CN106329932B CN106329932B CN201510395673.6A CN201510395673A CN106329932B CN 106329932 B CN106329932 B CN 106329932B CN 201510395673 A CN201510395673 A CN 201510395673A CN 106329932 B CN106329932 B CN 106329932B
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Abstract
The invention discloses a kind of control method and device of DC converter, to solve the problems, such as that the higher-order of oscillation occur in input current and filter capacitor voltage.The control method include: need by the state of first switch unit in DC converter by high frequency chopping switch to power frequency it is long logical when, the duty ratio for controlling the driving signal of first switch unit is changed to the first default duty ratio according to the first preset step-length.
Description
Technical field
The present invention relates to power electronics field more particularly to a kind of control method and device of DC converter.
Background technique
Current some equipment such as uninterruptible power supply (UPS, Uninterruptible Power Supply), in order to save
Cost-saving usually can all make PFC (PFC, Power Factor Correction) circuit most in circuit design
Possible and DC converter common parts.Such as uninterruptible power supply shown in FIG. 1, that is, illustrate a kind of preferably shared side
Case；Under electric power storage pool mode, DC converter carries out boosting inverter to battery voltage in dotted line frame, empty under utility mode
DC converter and the rectifier bridge of prime constitute circuit of power factor correction in wire frame, realize power factor emendation function.Wherein,
Capacitor C1 is to solve uninterruptible power supply the cathode voltage high frequency jump problem of battery and filter for introducing under utility mode
Wave capacitor, two switch units (i.e. switching tube Q1 and switching tube Q2) in one end connection DC converter of filter capacitor C1
The other end of tie point, filter capacitor C1 is connected between inductance L1 and battery positive voltage, and certain filter capacitor C1's is another
One end also can connect between inductance L2 and battery terminal negative.
In the prior art, uninterruptible power supply shown in FIG. 1 is under electric power storage pool mode, and the control program of DC converter is as schemed
Shown in 2, wherein g1 is the driving signal of switching tube Q1, and g2 is the driving signal of switching tube Q2.It is inverse when DC converter rear class
When becoming device positive half cycle inversion work, DC converter needs the positive direct-current bus BUS+ to its output end to provide energy, at this point, opening
Close that pipe Q2 power frequency is long logical, the duty ratio of the driving signal of switching tube Q2 is the first default duty ratio, this first default is accounted in Fig. 2
Sky is than being 1, switching tube Q1 high frequency chopping, and the duty ratio of the driving signal of switching tube Q1 is the second default duty ratio, this is second pre-
If duty ratio is not 1；When the inverter negative half period inversion of DC converter rear class work, DC converter needs to export to it
The negative DC bus BUS- at end provides energy, at this point, switching tube Q1 power frequency is long logical, the duty ratio of the driving signal of switching tube Q1 is
First default duty ratio, switching tube Q2 high frequency chopping, the duty ratio of the driving signal of switching tube Q2 are the second default duty ratio.
However, uninterruptible power supply shown in FIG. 1 under electric power storage pool mode, leads to, switching tube Q1 high when switching tube Q2 power frequency is long
When frequency copped wave, when DC converter is in steady-working state, filter capacitor C1 voltage is about battery voltage；As switching tube Q1
Power frequency is long logical, and when switching tube Q2 high frequency chopping, when DC converter is in steady-working state, filter capacitor C1 voltage is about 0.
Therefore, long logical, switching tube Q2 the state of power frequency is switched to by high frequency chopping in the state of switching tube Q1 to be switched to by power frequency length is logical
When high frequency chopping, inductance L1 and filter capacitor C1 can generate resonance under the excitation of filter capacitor C1 voltage, due to filter capacitor
C1 capacity is typically small, therefore the harmonic period is far smaller than half of power frequency period, makes input current and the filter of DC converter
There is high frequency oscillation in wave capacitor C1 voltage, until filter capacitor C1 voltage consumption finishes；And in the state of switching tube Q2 by high frequency
Copped wave switch to power frequency is long logical, state of switching tube Q1 by power frequency it is long it is logical switch to high frequency chopping when, inductance L2 and filter capacitor
C1 can generate resonance under the excitation of battery voltage, which is also far smaller than half of power frequency period, make DC converting
There is high frequency oscillation in the input current and filter capacitor C1 voltage of device, until filter capacitor C1 voltage is about battery voltage.It should
There is noise when can not only DC converter be made to work in the presence of the higher-order of oscillation, but will make input electromagnetic interference (EMI,
Electromagnetic Interference) it is unsatisfactory for demand.
Summary of the invention
The embodiment of the present invention provides a kind of control method and device of DC converter, to solve input current and filtering
There is the problem of higher-order of oscillation in capacitance voltage.
The embodiment of the invention provides a kind of control method of DC converter, the DC converter includes that DC/DC becomes
Change circuit and at least one filter capacitor；For each filter capacitor, one end of the filter capacitor is connected in DC/DC translation circuit
The tie point that is connected with second switch unit of first switch unit, the other end of the filter capacitor is connected to DC/DC transformation electricity
In road first input inductance and for DC converter power supply DC power supply anode between, alternatively, the filter capacitor is another
One end be connected in DC/DC translation circuit second input inductance with for DC converter power supply DC power supply cathode it
Between；The control method, comprising:
Need by the state of first switch unit in DC converter by high frequency chopping switch to power frequency it is long logical when, control
The duty ratio of the driving signal of first switch unit is changed to the first default duty ratio according to the first preset step-length.
Preferably, the duty ratio in the driving signal of control first switch unit is changed to first according to the first preset step-length
Before default duty ratio, further includes:
The driving signal of first switch unit and the driving signal of second switch unit are controlled at least one switch periods
It is interior identical.
Further, the corresponding conducting duration variable quantity of first preset step-length input inductance specified less than first and the
The harmonic period of one specified filter capacitor；Described first specified input inductance and the first specified filter capacitor is can be with institutes
State input inductance and filter unit that first switch unit constitutes resonant tank.
Preferably, the corresponding conducting duration variable quantity of first preset step-length is less than the first specified input inductance and first
The 1/4 of the harmonic period of specified filter capacitor, and first preset step-length makes the driving signal of the first switch unit
The required duration of change in duty cycle to the first default duty ratio is less than the 1/4 of power frequency period.
Preferably, the above method further include:
When needing the state of second switch unit in DC converter switching to high frequency chopping by power frequency length is logical, control
The duty ratio of the driving signal of second switch unit is changed to the second default duty ratio according to the second preset step-length.
Further, the corresponding conducting duration variable quantity of second preset step-length input inductance specified less than second and the
The harmonic period of two specified filter capacitors；Described second specified input inductance and the second specified filter capacitor is can be with institutes
State input inductance and filter unit that second switch unit constitutes resonant tank.
Preferably, the corresponding conducting duration variable quantity of second preset step-length is less than the second specified input inductance and second
The 1/4 of the harmonic period of specified filter capacitor, and second preset step-length makes the driving signal of the second switch unit
The required duration of change in duty cycle to the second default duty ratio is less than the 1/4 of power frequency period.
The embodiment of the invention also provides a kind of control device of DC converter, the DC converter includes DC/DC
Translation circuit and at least one filter capacitor；For each filter capacitor, one end of the filter capacitor connects DC/DC translation circuit
In the tie point that is connected with second switch unit of first switch unit, the other end of the filter capacitor is connected to DC/DC transformation
The first input inductance in circuit and between the anode for the DC power supply of DC converter power supply, alternatively, the filter capacitor
The other end be connected in DC/DC translation circuit second input inductance with for DC converter power supply DC power supply cathode it
Between；The control device, comprising:
First control unit, for needing the state by first switch unit in DC converter to be switched by high frequency chopping
When long logical to power frequency, the duty ratio for controlling the driving signal of first switch unit is changed to first according to the first preset step-length and presets
Duty ratio.
Preferably, first control unit, duty ratio in the driving signal of control first switch unit is also used to according to the
One preset step-length is changed to before the first default duty ratio, controls the driving signal and second switch unit of first switch unit
Driving signal is identical at least one switch periods.
Further, the corresponding conducting duration variable quantity of first preset step-length input inductance specified less than first and the
The harmonic period of one specified filter capacitor；Described first specified input inductance and the first specified filter capacitor is can be with institutes
State input inductance and filter unit that first switch unit constitutes resonant tank.
Preferably, the corresponding conducting duration variable quantity of first preset step-length is less than the first specified input inductance and first
The 1/4 of the harmonic period of specified filter capacitor, and first preset step-length makes the driving signal of the first switch unit
The required duration of change in duty cycle to the first default duty ratio is less than the 1/4 of power frequency period.
Preferably, above-mentioned apparatus further include:
Second control unit, for needing the state of second switch unit in DC converter by the long logical switching of power frequency
When to high frequency chopping, controlling the duty ratio of the driving signal of second switch unit, according to the second preset step-length to be changed to second default
Duty ratio.
Further, the corresponding conducting duration variable quantity of second preset step-length input inductance specified less than second and the
The harmonic period of two specified filter capacitors；Described second specified input inductance and the second specified filter capacitor is can be with institutes
State input inductance and filter unit that second switch unit constitutes resonant tank.
Preferably, the corresponding conducting duration variable quantity of second preset step-length is less than the second specified input inductance and second
The 1/4 of the harmonic period of specified filter capacitor, and second preset step-length makes the driving signal of the second switch unit
The required duration of change in duty cycle to the second default duty ratio is less than the 1/4 of power frequency period.
The beneficial effect comprise that
In scheme provided in an embodiment of the present invention, need the state by first switch unit in DC converter by high frequency
Copped wave switch to power frequency it is long logical when, the duty ratio for controlling the driving signal of first switch unit is gradually changed to the first default duty
Than；Using scheme provided in an embodiment of the present invention, the resonant tank that inductance and filter capacitor generate can be destroyed, resonant tank is made
The existing time is no more than harmonic period, avoids input current and filter capacitor voltage from high frequency oscillation occur, to avoid the height
Frequency vibration swings the operating noise and electromagnetic interference of introducing.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, is implemented with the present invention
Example is used to explain the present invention together, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is one of the schematic diagram of DC converter in the prior art；
Fig. 2 is the schematic diagram of the control program of DC converter in the prior art；
Fig. 3 is one of the schematic diagram of control program of DC converter provided in an embodiment of the present invention；
Fig. 4 is the realization schematic diagram of the driving signal of the switching tube in DC converter provided in an embodiment of the present invention；
Fig. 5 (a) is one of the schematic diagram of working condition of DC converter provided in an embodiment of the present invention；
Fig. 5 (b) is the two of the schematic diagram of the working condition of DC converter provided in an embodiment of the present invention；
Fig. 6 (a) is the three of the schematic diagram of the working condition of DC converter provided in an embodiment of the present invention；
Fig. 6 (b) is the four of the schematic diagram of the working condition of DC converter provided in an embodiment of the present invention；
Fig. 6 (c) is the five of the schematic diagram of the working condition of DC converter provided in an embodiment of the present invention；
Fig. 7 (a) is the six of the schematic diagram of the working condition of DC converter provided in an embodiment of the present invention；
Fig. 7 (b) is the seven of the schematic diagram of the working condition of DC converter provided in an embodiment of the present invention；
Fig. 7 (c) is the eight of the schematic diagram of the working condition of DC converter provided in an embodiment of the present invention；
Fig. 7 (d) is the nine of the schematic diagram of the working condition of DC converter provided in an embodiment of the present invention；
Fig. 8 is the two of the schematic diagram of the control program of DC converter provided in an embodiment of the present invention；
Fig. 9 (a) is the realization schematic diagram of the driving signal of the switching tube in DC converter provided in an embodiment of the present invention
One of；
Fig. 9 (b) is the realization schematic diagram of the driving signal of the switching tube in DC converter provided in an embodiment of the present invention
Two；
Figure 10 is the two of the schematic diagram of DC converter in the prior art；
Figure 11 is the three of the schematic diagram of DC converter in the prior art；
Figure 12 is the schematic diagram of the control device of DC converter provided in an embodiment of the present invention.
Specific embodiment
Solve the problems, such as that the implementation of the higher-order of oscillation occur in input current and filter capacitor voltage to provide, the present invention is real
Apply example and provide a kind of control method and device of DC converter, in conjunction with Figure of description to the preferred embodiment of the present invention into
Row explanation, it should be understood that preferred embodiments described herein are only used to illustrate and explain the present invention, is not used to limit this hair
It is bright.And in the absence of conflict, the features in the embodiments and the embodiments of the present application can be combined with each other.
The embodiment of the invention provides a kind of control method of DC converter, which includes DC/DC transformation
Circuit and at least one filter capacitor；For each filter capacitor, one end of the filter capacitor is connected in DC/DC translation circuit
The tie point that first switch unit is connected with second switch unit, the other end of the filter capacitor are connected to DC/DC translation circuit
In first input inductance and for DC converter power supply DC power supply anode between, alternatively, the filter capacitor is another
Between the second input inductance that end is connected in DC/DC translation circuit and the cathode for the DC power supply of DC converter power supply；
The control method includes:
Need by the state of first switch unit in DC converter by high frequency chopping switch to power frequency it is long logical when, control
The duty ratio of the driving signal of first switch unit is changed to the first default duty ratio according to the first preset step-length.That is control first
The duty ratio of the driving signal of switch unit is gradually changed to the first default duty ratio, in general, the variation is to increase variation.
Wherein, which is the duty ratio that first switch unit can be made to keep power frequency long logical, can with but
It is not limited to 1.
First preset step-length i.e. the state of first switch unit by high frequency chopping switch to power frequency it is long logical during, the
The change step of the duty ratio of the driving signal of one switch unit；By the definition of duty ratio it is found that different duty ratios is corresponding
Different conducting durations, therefore the first different preset step-lengths has corresponded to different conducting duration variable quantities.
In embodiments of the present invention, the corresponding conducting duration variable quantity of the first preset step-length should be less than the first specified input electricity
The harmonic period of sense and the first specified filter capacitor；Wherein, the first specified input inductance and the first specified filter capacitor be can
The input inductance and filter unit of resonant tank are constituted with first switch unit.
First preset step-length is smaller, and the inhibitory effect of concussion is better；First preset step-length is bigger, the shape of first switch unit
State switch speed is faster.
Preferably, the corresponding conducting duration variable quantity of the first preset step-length is specified less than the first specified input inductance and first
The 1/4 of the harmonic period of filter capacitor, and the first preset step-length makes the change in duty cycle of the driving signal of first switch unit extremely
The required duration of first default duty ratio is less than the 1/4 of power frequency period.
Specifically, the first preset step-length can be according to practical application scene, based on practical application scene to switch speed
It is required that, the concussion of input current and filter capacitor voltage requires to be determined.
Preferably, the duty ratio in the driving signal of control first switch unit is changed to first according to the first preset step-length
Before default duty ratio, the driving signal of first switch unit and the driving signal of second switch unit can also be controlled at least
It is identical in one switch periods.I.e. at least one switch periods, two switch units are simultaneously turned off and are simultaneously turned on, can be with
Accelerate the energy variation of filter capacitor, so as to accelerate handoff procedure.
In one particular embodiment of the present invention, need the state by second switch unit in DC converter by work
Frequency is long logical when switching to high frequency chopping, and can control the duty ratio of the driving signal of second switch unit, to be directly changed to second pre-
If duty ratio.In general, the variation is to reduce variation.
Wherein, which is not 1, is specifically set as the prior art, this will not be detailed here.
Control method provided in an embodiment of the present invention can be, but not limited to be applied to straight in uninterruptible power supply shown in FIG. 1
Current converter.Below with uninterruptible power supply shown in FIG. 1 under electric power storage pool mode, for the control of DC converter, to this hair
The principle for the control method that bright embodiment provides is described in detail.
In Fig. 1, when the working condition of the inverter of DC converter rear class switches to positive half cycle by negative half period inversion work
When inversion works, need the state of switching tube Q2 in DC converter switching to long logical, the switching tube Q1 of power frequency by high frequency chopping
State switch to high frequency chopping by power frequency is long logical, i.e., at this point, above-mentioned first switch unit is switching tube Q2, above-mentioned second switch
Unit is switching tube Q1；When the working condition of the inverter of DC converter rear class switches to negative half period by positive half cycle inversion work
When inversion works, need the state of switching tube Q1 in DC converter switching to long logical, the switching tube Q2 of power frequency by high frequency chopping
State when switching to high frequency chopping by power frequency is long logical, i.e., at this point, above-mentioned first switch unit is switching tube Q1, above-mentioned second is opened
Pass unit is switching tube Q2.
According to control method provided in an embodiment of the present invention, opened in the DC converter of uninterruptible power supply shown in FIG. 1
The driving signal g2 for closing the driving signal g1 and switching tube Q2 of pipe Q1 can be as shown in Figure 3.
When specific implementation, the driving signal g1 of switching tube Q1 be can be, but not limited to using the g1 fundamental wave and three in Fig. 4 in Fig. 3
Angle carrier wave realizes that the driving signal g2 of switching tube Q2 can be, but not limited to using the g2 fundamental wave and triangular carrier reality in Fig. 4 in Fig. 3
It is existing.
According to control program shown in Fig. 3, uninterruptible power supply shown in FIG. 1 becomes under electric power storage pool mode by direct current
The state of switching tube Q2 is switched to that power frequency is long logical, switching tube Q1 state is supreme by the long logical switching of power frequency by high frequency chopping in parallel operation
When frequency copped wave, the working condition of DC converter is divided into three phases:
Stage 1:
The duty ratio of the driving signal of switching tube Q1 is directly decreased to the second default duty ratio, the driving signal of switching tube Q2
It is identical as the driving signal of switching tube Q1 in first switch periods.I.e. in first switch periods, switching tube Q1 and open
The duty ratio for closing the driving signal of pipe Q2 is identical, and switching tube Q1 and switching tube Q2 are simultaneously turned on, simultaneously turned off, and DC converter is given
The positive and negative DC bus of its output end provides identical energy.
When switching tube Q1 and switching tube Q2 are simultaneously turned on, shown in the current direction of DC converter such as Fig. 5 (a):
Electric current flows through inductance L1, switching tube Q1, switching tube Q2, inductance L2 by battery positive voltage and returns to battery terminal negative, this
Inductance L1 and inductance L2 energy storage in the process.Simultaneously because filter capacitor C1 initial voltage is 0, electric current flows through filter by battery positive voltage
Wave capacitor C1, switching tube Q2, inductance L2 return to battery terminal negative, charge to filter capacitor C1, and filter capacitor C1 voltage increases.
When switching tube Q1 and switching tube Q2 are simultaneously turned on, shown in the current direction of DC converter such as Fig. 5 (b):
Electric current flows through inductance L1, diode D3, bus capacitor C2, bus capacitor C3, diode D4, electricity by battery positive voltage
Sense L2 returns to battery terminal negative, charges to bus capacitor C2, bus capacitor C3, and filter capacitor C1 stops charging during this.
As it can be seen that at this stage 1, although when switching tube Q1 and switching tube Q2 are simultaneously turned on, inductance L2 and filter capacitor C1
Resonance can be generated under the excitation of battery voltage, but when switching tube Q1 and switching tube Q2 are simultaneously turned off, resonant tank is broken
It is bad, therefore it is able to suppress the generation of concussion.
Stage 2: the duty ratio of the driving signal of switching tube Q1 is that the second default duty ratio is constant, the driving letter of switching tube Q2
Number duty ratio be gradually increased by the second default duty ratio.I.e. since second switch periods, switching tube Q1 and switching tube Q2
Driving signal duty ratio it is no longer identical, the energy that DC converter is provided to the positive direct-current bus of its output end is greater than to negative
The energy that DC bus provides.
The change step of the duty ratio of the driving signal of switching tube Q2 should be less than the resonance week of inductance L2 and filter capacitor C1
Phase.
When switching tube Q1 and switching tube Q2 are simultaneously turned on, shown in the current direction of DC converter such as Fig. 6 (a):
Electric current flows through inductance L1, switching tube Q1, switching tube Q2, inductance L2 by battery positive voltage and returns to battery terminal negative, this
Inductance L1 and inductance L2 energy storage in the process.Meanwhile electric current flows through filter capacitor C1, switching tube Q2, inductance L2 by battery positive voltage
Battery terminal negative is returned to, is charged to filter capacitor C1, filter capacitor C1 voltage increases.
When switching tube Q1 shutdown, switching tube Q2 conducting, shown in the current direction of DC converter such as Fig. 6 (b):
Electric current flows through inductance L1, diode D3, bus capacitor C2, switching tube Q2, inductance L2 by battery positive voltage and returns to storage
Battery cathode charges to bus capacitor C2.Simultaneously because filter capacitor C1 voltage is lower than battery voltage, electric current is by accumulator positive
Pole flows through filter capacitor C1, switching tube Q2, inductance L2 and returns to battery terminal negative, charges to filter capacitor C1, filter capacitor C1 electricity
Press height of continuing rising.
When switching tube Q1 and switching tube Q2 are simultaneously turned on, shown in the current direction of DC converter such as Fig. 6 (c):
Electric current flows through inductance L1, diode D3, bus capacitor C2, bus capacitor C3, diode D4, electricity by battery positive voltage
Sense L2 returns to battery terminal negative, charges to bus capacitor C2, bus capacitor C3, and filter capacitor C1 stops charging during this.
As it can be seen that at this stage 2, although when switching tube Q1 and switching tube Q2 are simultaneously turned on, and turn off in switching tube Q1,
When switching tube Q2 is connected, inductance L2 and filter capacitor C1 can generate resonance under the excitation of battery voltage, but in switching tube Q1
When simultaneously turning off with switching tube Q2, resonant tank is destroyed, therefore is able to suppress the generation of concussion.
Stage 3: the duty ratio of the driving signal of switching tube Q1 is that the second default duty ratio is constant, the driving letter of switching tube Q2
Number duty ratio be the first default duty ratio, in this specific embodiment, the first default duty ratio be 1.Pass through several switches
After period, switching tube Q2 power frequency is long logical, and DC converter only gives the positive direct-current bus of its output end to provide energy.
When switching tube Q1 conducting, switching tube Q2 power frequency are long logical, initial time, the current direction of DC converter such as Fig. 7
(a) shown in:
Electric current flows through inductance L1, switching tube Q1, switching tube Q2, inductance L2 by battery positive voltage and returns to battery terminal negative, this
Inductance L1 and inductance L2 energy storage in the process.Meanwhile electric current flows through filter capacitor C1, switching tube Q2, inductance L2 by battery positive voltage
Battery terminal negative is returned to, is charged to filter capacitor C1, filter capacitor C1 voltage increases.
Since inductance L2 electric current is in constant current state, the sum of filter capacitor C1 electric current and inductance L1 electric current are equal to inductance L2 electricity
Stream, inductance L1 electric current are gradually increased, and filter capacitor C1 electric current is gradually reduced, when inductance L1 electric current is greater than inductance L2 electric current, filter
Wave capacitor C1 anti-phase, at this time shown in the current direction of DC converter such as Fig. 7 (b).
When switching tube Q1 shutdown, switching tube Q2 power frequency are long logical, initial time, the current direction of DC converter such as Fig. 7
(c) shown in:
Electric current flows through inductance L1, diode D3, bus capacitor C2, switching tube Q2, inductance L2 by battery positive voltage and returns to storage
Battery cathode charges to bus capacitor C2.Simultaneously as filter capacitor C1 anti-phase, inductance L1 electric current is gradually reduced, and works as electricity
When feeling L1 electric current less than inductance L2 electric current, filter capacitor C1 electric current becomes positive, at this time the current direction of DC converter such as Fig. 7
(d) shown in.
Obviously, using control method provided in an embodiment of the present invention, by the state of switching tube Q2 in DC converter by
High frequency chopping switch to power frequency is long logical, state of switching tube Q1 by power frequency it is long it is logical switch to high frequency chopping when, inductance can be destroyed
The resonant tank that L2 and filter capacitor C1 is generated makes the time existing for resonant tank be no more than harmonic period, therefore is able to suppress
There is the higher-order of oscillation in input current and filter capacitor voltage.
Using control method provided in an embodiment of the present invention, cut by the state of switching tube Q1 in DC converter by high frequency
Wave switch to power frequency is long logical, state of switching tube Q2 by power frequency it is long it is logical switch to high frequency chopping when, the work shape of DC converter
State is similarly divided into three phases, and this will not be detailed here for specific workflow.Similarly, inductance L1 and filter capacitor can also be destroyed
The resonant tank that C1 is generated makes the time existing for resonant tank be no more than harmonic period, therefore is able to suppress input current and filter
There is the higher-order of oscillation in wave capacitance voltage.
In another specific embodiment of the invention, need by the state of second switch unit in DC converter by
Power frequency is long logical when switching to high frequency chopping, and the duty ratio that also can control the driving signal of second switch unit is default according to second
Step change is to the second default duty ratio.The duty ratio for controlling the driving signal of second switch unit is gradually changed to second in advance
If duty ratio.
Second preset step-length is i.e. during the state of second switch unit switches to high frequency chopping by power frequency is long logical, and the
The change step of the duty ratio of the driving signal of two switch units；By the definition of duty ratio it is found that different duty ratios is corresponding
Different conducting durations, therefore the second different preset step-lengths has corresponded to different conducting duration variable quantities.
In embodiments of the present invention, the corresponding conducting duration variable quantity of the second preset step-length can be less than the second specified input
The harmonic period of inductance and the second specified filter capacitor；Wherein, the second specified input inductance and the second specified filter capacitor are energy
Enough and second switch unit constitutes the input inductance and filter unit of resonant tank.
Second preset step-length is smaller, and the inhibitory effect of concussion is better；Second preset step-length is bigger, the shape of second switch unit
State switch speed is faster.
Preferably, the corresponding conducting duration variable quantity of the second preset step-length is specified less than the second specified input inductance and second
The 1/4 of the harmonic period of filter capacitor, and the second preset step-length makes the change in duty cycle of the driving signal of second switch unit extremely
The required duration of second default duty ratio is less than the 1/4 of power frequency period.
Specifically, the second preset step-length can be according to practical application scene, based on practical application scene to switch speed
It is required that, the concussion of input current and filter capacitor voltage requires to be determined.
At this point, in the DC converter of uninterruptible power supply shown in FIG. 1 switching tube Q1 driving signal g1 and switching tube
The driving signal g2 of Q2 can be as shown in Figure 8.
When specific implementation, the driving signal g1 of switching tube Q1 be can be, but not limited to using in Fig. 9 (a), Fig. 9 (b) in Fig. 8
G1 fundamental wave and triangular carrier realize that the driving signal g2 of switching tube Q2 can be, but not limited to using in Fig. 9 (a), Fig. 9 (b) in Fig. 8
G2 fundamental wave and triangular carrier realize.It should be noted that being only two of driving signal shown in Fig. 8 shown in Fig. 9 (a), Fig. 9 (b)
Kind implementation, is not intended to limit the present invention, and realizes that the fundamental wave form of driving signal shown in Fig. 8, carrier format can be certainly
By setting.For example, g1 fundamental wave and g2 fundamental wave may be the other forms such as parabolic waveform.
Control method provided in an embodiment of the present invention also can be applied to the DC converter in dotted line frame shown in Fig. 10,
Principle is similar.
Control method provided in an embodiment of the present invention also can be applied to the DC converter in dotted line frame shown in Figure 11,
At this point, a switch unit is switching tube Q1 and switching tube Q2, another switch unit is switching tube Q3 and switching tube Q4, according to
Actual conditions, one is used as above-mentioned first switch unit in two switch units, another is as above-mentioned second switch unit.
Control method provided in an embodiment of the present invention can also be applied in other similar DC converters, not another herein
One illustrates.
Based on the same inventive concept, the control method of the DC converter provided according to that above embodiment of the present invention, accordingly
Ground, the embodiment of the present invention also provide a kind of control device of DC converter, the DC converter include DC/DC translation circuit and
At least one filter capacitor；For each filter capacitor, first in one end connection DC/DC translation circuit of the filter capacitor is opened
Close the tie point that is connected with second switch unit of unit, the other end of the filter capacitor is connected to the in DC/DC translation circuit
One input inductance and for DC converter power supply DC power supply anode between, alternatively, the other end of the filter capacitor connects
Between the second input inductance in DC/DC translation circuit and the cathode for the DC power supply of DC converter power supply；The control
Device is as shown in figure 12, comprising:
First control unit 1201, for need the state by first switch unit in DC converter by high frequency chopping
Switch to power frequency it is long logical when, the duty ratio for controlling the driving signal of first switch unit is changed to first according to the first preset step-length
Default duty ratio.The duty ratio for controlling the driving signal of first switch unit is gradually changed to the first default duty ratio, in general,
The variation is to increase variation.
Wherein, which is the duty ratio that first switch unit can be made to keep power frequency long logical, can with but
It is not limited to 1.
Preferably, first control unit 1201, be also used to duty ratio in the driving signal of control first switch unit by
Before being changed to the first default duty ratio according to the first preset step-length, the driving signal and second switch list of first switch unit are controlled
The driving signal of member is identical at least one switch periods.I.e. at least one switch periods, two switch units are same
When shutdown simultaneously turn on, the energy variation of filter capacitor can be accelerated, so as to accelerate handoff procedure.
Further, the corresponding conducting duration variable quantity of the first preset step-length refers to less than the first specified input inductance and first
Determine the harmonic period of filter capacitor；First specified input inductance and the first specified filter capacitor are can be with first switch unit structure
At the input inductance and filter unit of resonant tank.
First preset step-length is smaller, and the inhibitory effect of concussion is better；First preset step-length is bigger, the shape of first switch unit
State switch speed is faster.
Preferably, the corresponding conducting duration variable quantity of the first preset step-length is specified less than the first specified input inductance and first
The 1/4 of the harmonic period of filter capacitor, and the first preset step-length makes the change in duty cycle of the driving signal of first switch unit extremely
The required duration of first default duty ratio is less than the 1/4 of power frequency period.
Specifically, the first preset step-length can be according to practical application scene, based on practical application scene to switch speed
It is required that, the concussion of input current and filter capacitor voltage requires to be determined.
Preferably, the control device, further includes:
Second control unit 1202, for needing to lead to the state of second switch unit in DC converter by power frequency is long
When switching to high frequency chopping, the duty ratio for controlling the driving signal of second switch unit is changed to second according to the second preset step-length
Default duty ratio.The duty ratio for controlling the driving signal of second switch unit is gradually changed to the second default duty ratio, in general,
The variation is to reduce variation.
Wherein, which is not 1, is specifically set as the prior art, this will not be detailed here.
Further, the corresponding conducting duration variable quantity of the second preset step-length refers to less than the second specified input inductance and second
Determine the harmonic period of filter capacitor；Second specified input inductance and the second specified filter capacitor are can be with second switch unit structure
At the input inductance and filter unit of resonant tank.
Second preset step-length is smaller, and the inhibitory effect of concussion is better；Second preset step-length is bigger, the shape of second switch unit
State switch speed is faster.
Preferably, the corresponding conducting duration variable quantity of the second preset step-length is specified less than the second specified input inductance and second
The 1/4 of the harmonic period of filter capacitor, and the second preset step-length makes the change in duty cycle of the driving signal of second switch unit extremely
The required duration of second default duty ratio is less than the 1/4 of power frequency period.
Specifically, the second preset step-length can be according to practical application scene, based on practical application scene to switch speed
It is required that, the concussion of input current and filter capacitor voltage requires to be determined.
In other embodiments of the invention, the second control unit 1202 can be used for needing DC converter
When the state of middle second switch unit switches to high frequency chopping by power frequency length is logical, accounting for for the driving signal of second switch unit is controlled
Sky is than being directly changed to the second default duty ratio.
In conclusion efficiently solving input current and filter capacitor voltage using scheme provided in an embodiment of the present invention
There is higher-order of oscillation problem.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, those skilled in the art can carry out various modification and variations without departing from this hair to the embodiment of the present invention
The spirit and scope of bright embodiment.In this way, if these modifications and variations of the embodiment of the present invention belong to the claims in the present invention
And its within the scope of equivalent technologies, then the present invention is also intended to include these modifications and variations.
Claims (14)
1. a kind of control method of DC converter, the DC converter includes DC/DC translation circuit and at least one filtering
Capacitor；For each filter capacitor, one end of the filter capacitor connects the first switch unit and second in DC/DC translation circuit
The connected tie point of switch unit, the other end of the filter capacitor be connected to the first input inductance in DC/DC translation circuit with
Between anode for the DC power supply of DC converter power supply, alternatively, the other end of the filter capacitor is connected to DC/DC transformation electricity
In road second input inductance and for DC converter power supply DC power supply cathode between；The control method, feature
It is, comprising:
Need by the state of first switch unit in DC converter by high frequency chopping switch to power frequency it is long logical when, control first
The duty ratio of the driving signal of switch unit is changed to the first default duty ratio according to the first preset step-length.
2. the method as described in claim 1, which is characterized in that pressed in the duty ratio of the driving signal of control first switch unit
It is changed to before the first default duty ratio according to the first preset step-length, further includes:
The driving signal of control first switch unit and the driving signal of second switch the unit phase at least one switch periods
Together.
3. method according to claim 1 or 2, which is characterized in that the corresponding conducting duration variation of first preset step-length
Measure the harmonic period less than first specified input inductance and the first specified filter capacitor；Described first specified input inductance and described
First specified filter capacitor is the input inductance and filter capacitor that resonant tank can be constituted with the first switch unit.
4. method as claimed in claim 3, which is characterized in that the corresponding conducting duration variable quantity of first preset step-length is small
In the 1/4 of the first specified input inductance and the harmonic period of the first specified filter capacitor, and described in first preset step-length makes
The required duration of the change in duty cycle of the driving signal of first switch unit to the first default duty ratio is less than the 1/ of power frequency period
4。
5. the method as described in claim 1, which is characterized in that further include:
When needing the state of second switch unit in DC converter switching to high frequency chopping by power frequency length is logical, control second
The duty ratio of the driving signal of switch unit is changed to the second default duty ratio according to the second preset step-length.
6. method as claimed in claim 5, which is characterized in that the corresponding conducting duration variable quantity of second preset step-length is small
In the harmonic period of the second specified input inductance and the second specified filter capacitor；Described second specified input inductance and described second
Specified filter capacitor is the input inductance and filter capacitor that resonant tank can be constituted with the second switch unit.
7. method as claimed in claim 6, which is characterized in that the corresponding conducting duration variable quantity of second preset step-length is small
In the 1/4 of the second specified input inductance and the harmonic period of the second specified filter capacitor, and described in second preset step-length makes
The required duration of the change in duty cycle of the driving signal of second switch unit to the second default duty ratio is less than the 1/ of power frequency period
4。
8. a kind of control device of DC converter, the DC converter includes DC/DC translation circuit and at least one filtering
Capacitor；For each filter capacitor, one end of the filter capacitor connects the first switch unit and second in DC/DC translation circuit
The connected tie point of switch unit, the other end of the filter capacitor be connected to the first input inductance in DC/DC translation circuit with
Between anode for the DC power supply of DC converter power supply, alternatively, the other end of the filter capacitor is connected to DC/DC transformation electricity
In road second input inductance and for DC converter power supply DC power supply cathode between；The control device, feature
It is, comprising:
First control unit, for needing the state by first switch unit in DC converter to switch to work by high frequency chopping
When frequency is long logical, the duty ratio for controlling the driving signal of first switch unit is changed to the first default duty according to the first preset step-length
Than.
9. device as claimed in claim 8, which is characterized in that first control unit is also used in control first switch unit
Driving signal duty ratio according to the first preset step-length be changed to the first default duty ratio before, control first switch unit
Driving signal is identical at least one switch periods as the driving signal of second switch unit.
10. device as claimed in claim 8 or 9, which is characterized in that the corresponding conducting duration variation of first preset step-length
Measure the harmonic period less than first specified input inductance and the first specified filter capacitor；Described first specified input inductance and described
First specified filter capacitor is the input inductance and filter capacitor that resonant tank can be constituted with the first switch unit.
11. device as claimed in claim 10, which is characterized in that the corresponding conducting duration variable quantity of first preset step-length
Less than the 1/4 of the first specified harmonic period for inputting inductance and the first specified filter capacitor, and first preset step-length makes institute
The required duration for stating change in duty cycle to the first default duty ratio of the driving signal of first switch unit is less than power frequency period
1/4。
12. device as claimed in claim 8, which is characterized in that further include:
Second control unit, for need the state of second switch unit in DC converter is supreme by the long logical switching of power frequency
When frequency copped wave, the duty ratio for controlling the driving signal of second switch unit is changed to the second default duty according to the second preset step-length
Than.
13. device as claimed in claim 12, which is characterized in that the corresponding conducting duration variable quantity of second preset step-length
Less than the harmonic period of the second specified input inductance and the second specified filter capacitor；Described second specified input inductance and described the
Two specified filter capacitors are the input inductance and filter capacitor that resonant tank can be constituted with the second switch unit.
14. device as claimed in claim 13, which is characterized in that the corresponding conducting duration variable quantity of second preset step-length
Less than the 1/4 of the second specified harmonic period for inputting inductance and the second specified filter capacitor, and second preset step-length makes institute
The required duration for stating change in duty cycle to the second default duty ratio of the driving signal of second switch unit is less than power frequency period
1/4。
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| CN201510395673.6A CN106329932B (en) | 2015-07-06 | 2015-07-06 | A kind of control method and device of DC converter |
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| CN201510395673.6A CN106329932B (en) | 2015-07-06 | 2015-07-06 | A kind of control method and device of DC converter |
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| CN106329932B true CN106329932B (en) | 2019-05-31 |
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| CN112865494B (en) * | 2021-01-19 | 2022-04-22 | 清华大学 | Method for suppressing high-frequency oscillation in alternating-current distribution parameter network of direct-current transformer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5499178A (en) * | 1991-12-16 | 1996-03-12 | Regents Of The University Of Minnesota | System for reducing harmonics by harmonic current injection |
| CN102611295A (en) * | 2012-03-13 | 2012-07-25 | 华为技术有限公司 | Power factor corrector |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7705489B2 (en) * | 2006-09-08 | 2010-04-27 | American Power Conversion Corporation | Method and apparatus for providing uninterruptible power |
| US9263960B2 (en) * | 2013-09-16 | 2016-02-16 | Delta Electronics, Inc. | Power converters for wide input or output voltage range and control methods thereof |
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2015
- 2015-07-06 CN CN201510395673.6A patent/CN106329932B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5499178A (en) * | 1991-12-16 | 1996-03-12 | Regents Of The University Of Minnesota | System for reducing harmonics by harmonic current injection |
| CN102611295A (en) * | 2012-03-13 | 2012-07-25 | 华为技术有限公司 | Power factor corrector |
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