CN108306497A - A kind of multiphase interleaving controller and its control method - Google Patents
A kind of multiphase interleaving controller and its control method Download PDFInfo
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- CN108306497A CN108306497A CN201710023367.9A CN201710023367A CN108306497A CN 108306497 A CN108306497 A CN 108306497A CN 201710023367 A CN201710023367 A CN 201710023367A CN 108306497 A CN108306497 A CN 108306497A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a kind of multiphase interleaving controller and its control methods, it may include acquisition module, the status signal for acquiring the circuit of power factor correction；The status signal includes input voltage, output voltage, main inductance, synchronous inductance, the first electric current for flowing through the main inductance and the second electric current for flowing through the synchronous inductance；Control module, for according to the status signal and default Setting signal, it determines corresponding peak point current a reference value and peak point current regulated value, and is based on the peak point current a reference value, the peak point current regulated value and second electric current, obtain controlling signal accordingly；Drive module, for according to the control signal, drive signal to be sent to the circuit of power factor correction.To solve the problems, such as that current ripples present in existing multiphase interleaving controller are larger, power grid practicability is poor and can not closed loop adjust.
Description
Technical field
The present invention relates to power conversion technical field more particularly to a kind of multiphase interleaving controller and its controlling parties
Method.
Background technology
With the development of power electronic technique, requirement of the people to power supply product is higher and higher, such as power supply product is required to have
There are high reliability, efficientibility and high power density etc..In order to meet the above demand, the PFC in existing power supply product
(Power Factor Correction, PFC) topology has not used bridge PFC generally, but non-bridge PFC,
Such as double BOOST non-bridge PFCs topologys, H bridges PFC topologys and Totem Pole (totem pillar) PFC topologys etc..However, if only
Pressure drop caused by rectifier bridge is eliminated from topological structure and power supply product is promoted instead of rectifier diode using metal-oxide-semiconductor
High efficiency or far from being enough, will also try every possible means in control.
Currently, can realize ZVS's (Zero Voltage Switch, zero voltage switch) by what professor Kolar proposed
TCM (Triangular Current Mode, triangular current pattern) control program enables to Totem Pole PFC topological
It has higher efficiency.Specifically, in TCM control programs, the work wave of PFC inductive currents is triangular in shape and has one
Fixed negative current, thus the ZVS conductings of metal-oxide-semiconductor may be implemented, the switching loss of metal-oxide-semiconductor is thereby reduced, power supply production is improved
The efficiency of product.But in the Totem Pole PFC topologys of TCM controls, the ripple of inductive current is than traditional inductive current
The ripple of (such as CCM, Continuous Conduction Mode, continuous conduction mode) is much larger.This may can cause defeated
Enter EMI (Electro Magnetic Interference, electromagnetic interference) filter design it is increasingly complex, to the humorous of power grid
The problem of wave action bigger.Therefore, the Totem Pole PFC topologys of TCM controls mostly use multiphase to design, and are handed over using multiphase
Wrong Parallel Control reduces current ripples.
But for TCM control modes, since its working frequency is variation in a power frequency period, if
Still it continues to use crisscross parallel control mode in the prior art and (directly calculates turn-on time Ton, turn-off time Toff, negative electricity
Time Tr is flowed to realize the ZVS of metal-oxide-semiconductor), it just can not well be controlled when input voltage is distorted, so that whole
The grid adaptability of a control program is very poor, and can not carry out closed loop adjusting to entire control flow.
That is, existing multiphase interleaving controller that there are current ripples is larger, grid adaptability is poor and
Can not closed loop adjust the problem of.
Invention content
An embodiment of the present invention provides a kind of multiphase interleaving controller and its control methods, existing more to solve
Current ripple present in staggered parallel controller is larger, power grid practicability is poor and can not closed loop the problem of adjusting.
An embodiment of the present invention provides a kind of multiphase interleaving controllers, including circuit of power factor correction, acquisition mould
Block, control module and drive module, wherein：
The acquisition module, the status signal for acquiring the circuit of power factor correction, and by the status signal
It is sent to the control module；The status signal include input voltage, output voltage, main inductance, synchronous inductance, flow through it is described
First electric current of main inductance and the second electric current for flowing through the synchronous inductance；
The control module, for according to the status signal and default Setting signal received, determining corresponding
Peak point current a reference value and peak point current regulated value, and based on the peak point current a reference value, the peak point current regulated value
And second electric current, it obtains controlling signal accordingly, and the control signal is sent to the drive module；
The drive module, for according to the control signal received, determination to be corresponding with the control signal
Drive signal, and the control terminal for each switching device drive signal being sent in the circuit of power factor correction, with
Control the break-make of each switching device in the circuit of power factor correction.
Correspondingly, the embodiment of the present invention additionally provides a kind of multiphase interleaving control method, including：
Acquire the status signal of the circuit of power factor correction；
According to the status signal and default Setting signal, corresponding peak point current a reference value and peak point current are determined
Regulated value, and it is based on the peak point current a reference value, the peak point current regulated value and second electric current, it obtains corresponding
Control signal；
According to the control signal, drive signal corresponding with the control signal is determined, and believe according to the driving
The break-make of each switching device in number control circuit of power factor correction；
Wherein, the status signal includes input voltage, output voltage, main inductance, synchronous inductance, flows through the main inductance
The first electric current and flow through the second electric current of the synchronous inductance.
The present invention has the beneficial effect that：
An embodiment of the present invention provides a kind of multiphase interleaving controller and its control methods, it may include power factor school
Positive circuit, acquisition module, control module and drive module.Wherein：The acquisition module, for acquiring the power factor school
The status signal of positive circuit, and the status signal is sent to the control module；The status signal include input voltage,
Output voltage, main inductance, synchronous inductance, the first electric current for flowing through the main inductance and the second electricity for flowing through the synchronous inductance
Stream；The control module, for according to the status signal and default Setting signal received, determining corresponding control letter
Number, and the control signal is sent to the drive module；The drive module, for according to the control letter received
Number, determine drive signal corresponding with the control signal, and the drive signal is sent to the PFC
The control terminal of each switching device in circuit, to control the break-make of each switching device in the circuit of power factor correction.Phase
Multiphase interleaving controller than being provided in the prior art, the embodiment of the present invention can be according in the status signal
The peak point current regulated value for peak point current to be adjusted is calculated in the phase information of one electric current and the second electric current,
Thus when input voltage is distorted, it can be adjusted and be effectively controlled by closed loop, solved existing multiphase and interlock
Current ripples present in parallel controller are larger, power grid practicability is poor and can not closed loop the problem of adjusting.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 show the structural schematic diagram of the multiphase interleaving controller provided in the embodiment of the present invention one；
Fig. 2 show the circuit structure diagram of the first circuit of power factor correction provided in the embodiment of the present invention one；
Fig. 3 show a kind of waveform of the inductive current of the first circuit of power factor correction of offer of the embodiment of the present invention
Schematic diagram；
Fig. 4 show the circuit structure diagram of the phase circuit of power factor correction provided in the prior art；
The positive half cycle waveform that Fig. 5 show the inductive current of the phase circuit of power factor correction provided in the prior art shows
It is intended to；
Fig. 6 show the circuit structure diagram of second of the circuit of power factor correction provided in the embodiment of the present invention one；
Fig. 7 show the structural schematic diagram of the control module provided in the embodiment of the present invention one；
Fig. 8 show the structural schematic diagram of the peak point current a reference value determination sub-module provided in the embodiment of the present invention one；
Fig. 9 show the first electric current and second of the two-phase circuit of power factor correction provided in the embodiment of the present invention one
The waveform diagram of electric current；
Figure 10 show the flow diagram of the calculating step of the peak point current regulated value provided in the embodiment of the present invention one；
Figure 11 show the flow diagram of the calculating step of the phase difference provided in the embodiment of the present invention one；
Figure 12 show the characterization schematic diagram of the phase difference provided in the embodiment of the present invention one and peak point current regulated value；
Figure 13 show the structural schematic diagram of the control signal determination sub-module provided in the embodiment of the present invention one；
Figure 14 show the practical structures schematic diagram of the control module provided in the embodiment of the present invention one；
The waveform of the first electric current and the second electric current that Figure 15 is shown in the example provided in the embodiment of the present invention one shows
It is intended to；
Figure 16 show the flow diagram of the multiphase interleaving control method provided in the embodiment of the present invention two.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.
Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts all
Other embodiments shall fall within the protection scope of the present invention.
Embodiment one：
In order to solve current ripple present in existing multiphase interleaving controller is larger, power grid practicability it is poor with
And can not closed loop adjust the problem of, an embodiment of the present invention provides a kind of multiphase interleaving controllers, as shown in Figure 1, it is
The structural schematic diagram of multiphase interleaving controller described in the embodiment of the present invention.Specifically, as shown in Figure 1, the multiphase
Crisscross parallel controller may include circuit of power factor correction 11, acquisition module 12, control module 13 and drive module 14,
In：
The acquisition module 12, can be used for acquiring the status signal of the circuit of power factor correction 11, and by the shape
State signal is sent to the control module 13；The status signal include input voltage, output voltage, main inductance, synchronous inductance,
It flows through the first electric current of the main inductance and flows through the second electric current of the synchronous inductance (it should be noted that the state
Signal may also include other signals, as long as the current state of the circuit of power factor correction can be characterized, not make to this
Any restriction)；
The control module 13 can be used for, according to the status signal and default Setting signal that receive, determining phase
The peak point current a reference value and peak point current regulated value answered, and based on the peak point current a reference value, the peak point current tune
Section value and second electric current obtain controlling signal accordingly, and the control signal are sent to the drive module 14；
The drive module 14 can be used for according to the control signal received, and determination is opposite with the control signal
The drive signal answered, and the control for each switching device drive signal being sent in the circuit of power factor correction 11
End, to control the break-make of each switching device in the circuit of power factor correction 11.
That is, the multiphase interleaving controller described in the embodiment of the present invention, it may include PFC electricity
Road, acquisition module, control module and drive module.Wherein：The acquisition module, for acquiring the PFC electricity
The status signal on road, and the status signal is sent to the control module；The status signal includes input voltage, output
Voltage, main inductance, synchronous inductance, the first electric current for flowing through the main inductance and the second electric current for flowing through the synchronous inductance；
The control module, for according to the status signal and default Setting signal received, determining corresponding control signal,
And the control signal is sent to the drive module；The drive module, for according to the control signal that receives,
It determines drive signal corresponding with the control signal, and the drive signal is sent to the circuit of power factor correction
In each switching device control terminal, to control the break-make of each switching device in the circuit of power factor correction.Compared to
The prior art, the multiphase interleaving controller provided in the embodiment of the present invention can be according to the first electricity in the status signal
The phase information of stream and the second electric current, is calculated the peak point current regulated value for peak point current to be adjusted, thus
When input voltage is distorted, it can be adjusted and be effectively controlled by closed loop, solve existing multiphase interleaving
Current ripples present in controller are larger, power grid practicability is poor and can not closed loop the problem of adjusting.
Wherein, it should be noted that the default Setting signal usually may include the defeated of the circuit of power factor correction
Go out voltage reference value (U i.e. hereinafterout_set) etc., certainly, the default Setting signal may also include other signals；And it is logical
In the case of often, the default Setting signal can save in the memory (such as ROM or RAM) in the control module 13,
Certainly, the default Setting signal also can save in the acquisition module 12, when in use as corresponding status signal is sent out
It send to the control module 13, the embodiment of the present invention is not limited in any way this.
Optionally, the switching device in the circuit of power factor correction described in the embodiment of the present invention can be transistor, such as
Can be triode (such as N-type triode, p-type triode), field-effect tube (such as P-MOS pipes, N-MOS pipes).Certainly, it needs
It is bright, the switching device can also be other hardware switch devices, such as can be single-pole double-throw switch (SPDT), double-point double-throw switch,
As long as different circuit pathways can be connected according to corresponding drive signal, the embodiment of the present invention does not repeat this.
Furthermore, it should be noted that the topological structure of the circuit of power factor correction described in the embodiment of the present invention is usual
It can be PFC topological structures, such as can be double BOOST non-bridge PFCs topological structures, H bridge PFC topological structures and Totem Pole (figures
Rise pillar) PFC topological structures etc., the embodiment of the present invention is not also limited in any way this.
Since each inductance in double BOOST non-bridge PFCs topological structures only works half period, another half period is only returned
Branch is flowed, too small amount of power current is flowed, thus there is a problem of that the utilization rate of inductance is relatively low；And H bridge PFC topological structures exist
Each stage can also there is a problem of less efficient also only by two semiconductor devices.Therefore, implement in the present invention
In example, the higher Totem Pole PFC topological structures of efficiency may be selected.
Further, it should be noted that circuit of power factor correction described in the embodiment of the present invention generally can be multiphase
Circuit of power factor correction such as can be two-phase circuit of power factor correction, three-phase power factor correcting circuit and four phase power
Factor correcting circuit etc., the embodiment of the present invention is not limited in any way this.
In the following, using the circuit of power factor correction described in the embodiment of the present invention as two-phase circuit of power factor correction (i.e.
Two-phase Totem Pole PFC) for, the operation principle of the circuit of power factor correction described in the embodiment of the present invention is carried out
It introduces in detail：
Specifically, as shown in Fig. 2, it is tied for the topology of the two-phase circuit of power factor correction described in the embodiment of the present invention
Structure schematic diagram (switching device is for metal-oxide-semiconductor).As shown in Figure 2, the circuit of power factor correction usually may include input electricity
Source (U as shown in Figure 2in), main inductance L1, synchronous inductance L2, first switch (S1 as shown in Figure 2), second switch (such as
S2 shown in Fig. 2), third switch (S3 as shown in Figure 2), the 4th switch (S4 as shown in Figure 2), the 5th switch
(S5 as shown in Figure 2), the 6th switch components such as (S6 as shown in Figure 2) and capacitance (C as shown in Figure 2).
Further, it is assumed that the control mode of the two-phase circuit of power factor correction is TCM control modes, then flows through institute
State main inductance L1The first electric current iL1And flow through the synchronous inductance L2The second electric current iL2Oscillogram can be as shown in Figure 3.
From the figure 3, it may be seen that the first electric current iL1And the second electric current iL2Phase difference can be Δ T, in order to realize misphase control,
With regard to needing the phase difference reducing (the smaller the better).
It should be noted that due to the two-phase circuit of power factor correction be actually considered as two phase power because
The parallel-connection structure of number book correcting circuit, thus, in order to which the misphase control for being directed to the two-phase circuit of power factor correction is described in detail
System, electricity that can first to phase circuit of power factor correction in the prior art (by taking Totem Pole PFC topological structures as an example)
Inducing current is analyzed.
For example, it is assumed that the switching device in the phase Totem Pole PFC topological structures can be metal-oxide-semiconductor, then it is described
The concrete structure of one phase Totem Pole PFC topological structures can be as shown in figure 4, it be the phase Totem provided in the prior art
Pole PFC topological structure schematic diagrames.Specifically, as shown in Figure 4, the phase Totem Pole PFC topological structures specifically may be used
Including input power (U as shown in Figure 4in), inductance L, first switch (S1 as shown in Figure 4), second switch (such as Fig. 4
Shown in S2) and capacitance (C as shown in Figure 4).
Specifically, the waveform diagram of the inductive current of the phase Totem Pole PFC topological structures can be such as Fig. 5 institutes
Show, be phase Totem Pole PFC topological structures described in the prior art inductive current positive half cycle oscillogram (still
By taking TCM as an example).As shown in Figure 5, in a switch periods (i.e. AC positive half cycles), the oscillogram of the inductive current can divide
For five parts：
First part, i.e., in tONPeriod, at this point, the first switch S1 is connected, the second switch S2 shutdowns so that stream
The electric current for crossing the inductance is gradually increasing as peak value iS(the i.e. described inductance carries out energy storage)；
Second part, i.e., in tS1Period (was also referred to as the first change of current stage), due to the first switch S1 shutdown after,
The drive signal of the second switch S2 does not come also, so that it (is specially described first to flow through the first switch S1 originally
The ontology metal-oxide-semiconductor of switch S1) electric current, on the body diode of the change of current to the second switch S2, and then may make described second
The drain-source voltage of switch S2 drops to 0, and then the drain-source voltage of the first switch S1 may make to rise to Uout；
Part III, i.e., in tOFFPeriod, at this point, the first switch S1 is turned off, the second switch S2 conductings so that
The electric current of the inductance is flowed through from peak value iSDrop to 0 (the i.e. described inductance releases energy)；It should be noted that at this point, described
Inductance is charged by the second switch S2 to the capacitance C；
Part IV, i.e., in tRPeriod, at this point, the second switch S2 continues to be connected, the first switch S1 continues to close
It is disconnected so that the electric current for flowing through the inductance drops to valley i from subzeroR(the i.e. described capacitance electric discharge, leads to have reverse current to flow through institute
State inductance)；It should be noted that at this point, due to negative current presence so that inductive current is reversed, realizes first switch S1's
ZVS does not repeat this.
Part V, i.e., in tS2Period (was also referred to as the second change of current stage), at this point, the first switch S1 and described
Two switch S2 are turned off, since after second switch S2 shutdowns, the drive signal of the first switch S1 does not come also, thus
So that flowing through the electric current of the second switch S2 (the concretely ontology metal-oxide-semiconductor of the second switch S2) originally (that is, the 4th
The negative-phase sequence curent determined in point), on the body diode of the change of current to the first switch S1, and then it may make the first switch
The drain-source voltage of S1 drops to 0, and then the drain-source voltage of the second switch S2 may make to rise to busbar Uout。
Wherein, it should be noted that the tON, the tOFFAnd the tRIt can be obtained by following three formula：
Wherein, the iSThe peak point current of the inductance, the i can be indicated to flow throughRThe valley of the inductance can be indicated to flow through
Electric current, the L can indicate the inductance value of the inductance, the UinIt can indicate the phase Totem Pole PFC topological structures
Input voltage, the UoutIt can indicate the output voltage of a phase Totem Pole PFC topological structures.
It, can first will be described that is, when the circuit of power factor correction is two-phase circuit of power factor correction
Two-phase circuit of power factor correction is divided into two phase circuit of power factor correction, such as only includes the one one phase power of main inductance
Factor correcting circuit and the 2nd 1 phase circuit of power factor correction for only including synchronous inductance, and each phase work(can be directed to
Rate factor correcting circuit determines the inductive current of the circuit of power factor correction, such as flows through the first electric current and stream of main inductance
Cross the second electric current of synchronous inductance.Then the second electric current for flowing through synchronous inductance can be adjusted, such as can synchronizes electricity by described
The peak point current of sense is adjusted at the peak point current of main inductance, to not only reduce current ripples, also improves power grid practicality
Property, it also ensures closed loop adjusting control, wouldn't repeat herein.
It should be noted that under normal conditions, since the inductance value of the main inductance and the synchronous inductance (can basis
Actual demand is flexibly set) it is identical, thus, it can be using any inductance in the two-phase circuit of power factor correction as the master
Another inductance different from the main inductance in the two-phase circuit of power factor correction is synchronized electricity by inductance as described
Sense, such as can also be by the L in Fig. 21As synchronous inductance, by the L in Fig. 22As main inductance etc., this is not repeated.
In addition, it is necessary to explanation, if the circuit of power factor correction is two-phase circuit of power factor correction, institute
State the first switch S1 and third switch S3 control terminal (such as described S1, S2, S3 and S4 be metal-oxide-semiconductor, then the control
End can be the grid of the metal-oxide-semiconductor；If described S1, S2, S3 and S4 are triode, then the control terminal can be the triode
Base stage) the phase difference of drive signal can be 180 °, the control terminal of the second switch S2 and the 4th switch S4
The phase difference of drive signal also can be 180 °, not repeat this.
When needing to carry out misphase control to the two-phase circuit of power factor correction, the two-phase power can first determine that
The status signal of factor correcting circuit, i.e., input voltage, output voltage, the main inductance of the described two-phase circuit of power factor correction
(such as can be L1), synchronous inductance (such as can be L2), flow through the first electric current of the main inductance and flow through the of the synchronous inductance
Two electric currents, then can be determined based on the status signal and the default Setting signal corresponding peak point current a reference value and
Peak point current regulated value can finally be based on the peak point current a reference value, the peak point current regulated value and second electricity
Stream obtains the control signal for controlling the electric current on the synchronous inductance, and the two-phase power is driven to control drive module 14
Switching device in factor correcting circuit.Compared with the prior art, in embodiments of the present invention, the control signal is to be based on institute
State what peak point current a reference value, the peak point current regulated value and second electric current obtained, rather than according to peak value electricity
Stream a reference value and second electric current obtain, to when input voltage is distorted, remain to keep the accuracy of control, solution
The current ripples determined present in existing two-phase crisscross parallel controller are larger, power grid practicability is poor and can not closed loop tune
The problem of section.
Optionally, when the circuit of power factor correction is three-phase power factor correcting circuit, then the three phase power
The circuit structure of factor correcting circuit usually can be as shown in fig. 6, it be the three-phase activity coefficient school described in the embodiment of the present invention
The circuit structure diagram of positive circuit.It will be appreciated from fig. 6 that the three-phase power factor correcting circuit usually may include input power (such as Fig. 6
Shown in Uin), main inductance L1, synchronous inductance (i.e. the first synchronous inductance L2And the second synchronous inductance L3), first switch (such as
S1 shown in Fig. 6), second switch (S2 as shown in Figure 6), third switch (S3 as shown in Figure 6), the 4th switch
(S4 as shown in Figure 6), the 5th switch (S5 as shown in Figure 6), the 6th switch (S6 as shown in Figure 6), the 7th open
Close (S7 as shown in Figure 6), the 8th first device of switch (S8 as shown in Figure 6) and capacitance (C as shown in Figure 6) etc.
Part.
Due under normal conditions, the main inductance, first synchronous inductance and second synchronous inductance inductance
Amount (can flexibly being set according to actual demand) is identical, thus, it can be by any inductance in the three-phase power factor correcting circuit
As the main inductance, by other two inductance different from the main inductance in the two-phase circuit of power factor correction point
Not Zuo Wei first synchronous inductance and second synchronous inductance, such as can be by the L in Fig. 61It, will be in Fig. 6 as main inductance
L2As the first synchronous inductance, by the L in Fig. 63As second synchronous inductance etc., this is not repeated
Further more, in embodiments of the present invention, it, can be by each synchronous inductance (such as the first synchronous inductance in order to realize misphase control
And second synchronous inductance) peak point current be respectively adjusted at the peak point current of main inductance, to not only reduce electric current line
Wave also improves power grid practicability, also ensures closed loop adjusting control, wouldn't repeat herein.
In addition, it is necessary to explanation, if the circuit of power factor correction is three-phase power factor correcting circuit, institute
State first switch S1, the third switch S3 and the 5th switch S5 control terminal (such as described S1, S2, S3, S4, S5 with
And S6 is metal-oxide-semiconductor, then the control terminal can be the grid of the metal-oxide-semiconductor；If described S1, S2, S3, S4, S5 and S6 are three poles
Pipe, then the control terminal can be the base stage of the triode) the phase difference of drive signal can be 120 °, the second switch
The phase difference of the drive signal of the control terminal of S2, the 4th switch S4 and the 6th switch S6 is alternatively 120 °, to this
It does not repeat.
When needing to carry out misphase control to the three-phase power factor correcting circuit, the three phase power can first determine that
The status signal of factor correcting circuit, i.e., input voltage, output voltage, the main inductance of the described three-phase power factor correcting circuit
(such as can be L1), synchronous inductance (as include the first synchronous inductance L2And the second synchronous inductance L3), flow through the of the main inductance
One electric current and flow through the synchronous inductance the second electric current (including the first synchronous inductance as described in flowing through electron current 1 and
Flow through the electron current 2 of second synchronous inductance), then it can be determined based on the status signal and the default Setting signal
Corresponding peak point current a reference value (such as may include the first peak value current reference value i of first synchronous inductanceS1_setAnd institute
State the second peak point current a reference value i of the second synchronous inductanceS2_set) and peak point current regulated value (such as may include that described first is same
Walk the first peak value current regulation value Δ I of inductance1And the second peak point current regulated value Δ I of second synchronous inductance2), most
After can be based on the peak point current a reference value, the peak point current regulated value and second electric current (as include electron current 1 with
And electron current 2) obtain for controlling the synchronous inductance (as included that first synchronous inductance and described second synchronize electricity
Sense) on electric current control signal, drive derailing switch in the three-phase power factor correcting circuit to control drive module 14
Part.Compared with the prior art, in embodiments of the present invention, the control signal is based on the peak point current a reference value, described
What peak point current regulated value and second electric current obtained, rather than according to the peak point current a reference value and second electricity
Stream obtains, and to when input voltage is distorted, remain to keep the accuracy of control, thus it is staggered to solve existing two
Current ripples present in parallel controller are larger, power grid practicability is poor and can not closed loop the problem of adjusting.
Further more, it should be noted that if the circuit of power factor correction is four phase circuit of power factor correction, often
The driving letter of the control terminal of four switches (such as can be S1, S3, S5 and S7 or S2, S4, S6 and S8) on one bridge arm
Number phase difference can be 90 ° of (other polyphase power factor correcting circuits, such as the staggered parallel controllers of N, on each of which bridge arm
Each switch on drive signal phase difference can and so on, such as can be 360 °/N), the embodiment of the present invention does not go to live in the household of one's in-laws on getting married to this
It states.
Further, as shown in fig. 7, the control module 13, may particularly include peak point current a reference value determination sub-module
71, peak point current regulated value determination sub-module 72 and control signal determination sub-module 73, wherein：
The peak point current a reference value determination sub-module 71, can be used for according to the input voltage, the output voltage with
And preset output voltage a reference value, the peak point current a reference value is calculated, and the peak point current a reference value is sent to institute
State control signal determination sub-module；
The peak point current regulated value determination sub-module 72 can be used for according to the input voltage, output voltage, synchronize electricity
Sense (due to the main inductance and synchronous inductance inductance value having the same, thus can also be the main inductance herein),
The phase information of the phase information of first electric current and second electric current calculates the peak point current regulated value, and will
The peak point current regulated value is sent to the control signal determination sub-module；
The control signal determination sub-module 73, for being adjusted according to the peak point current a reference value, the peak point current
The amplitude information of value and second electric current, determines the control signal, and the control signal is sent to the driving
Module.
That is, compared with the prior art, the control module 13 described in the embodiment of the present invention is in addition to may include peak value
Except current reference value determination sub-module 71 and control signal determination sub-module 73, it may also include the determination of peak point current regulated value
Submodule 72 is adjusted thus, it is possible to which phase adjusted information is converted to peak point current regulated value by adjusting the peak point current
Value, so that it may to realize multiphase interleaving control well.To when input voltage is distorted, remain to keep the standard of control
True property, solves that current ripples present in existing two-phase crisscross parallel controller are larger, power grid practicability is poor and nothing
The problem of method closed loop is adjusted.
Specifically, as shown in figure 8, the peak point current a reference value determination sub-module 71 specifically may include first adder
81, voltage ring controller 82 and multiplier 83, wherein：
The first adder 81 can be used for receiving the output voltage a reference value and the output voltage, and calculate
Difference between the output voltage a reference value and the output voltage, and the difference is exported to the Voltage loop and is controlled
Device 82；
The voltage ring controller 82, can be used for according to the difference, calculate the regulated voltage signal, and by the electricity
Pressure Regulate signal is sent to the multiplier 83；
The multiplier 83, the product for calculating the regulated voltage signal and the input voltage, and will be described
Product is as the peak point current a reference value, and the peak point current a reference value is sent to the control signal and determines submodule
Block 73.
Wherein, it should be noted that the voltage ring controller generally can be PFC voltage ring controllers, not go to live in the household of one's in-laws on getting married to this
It states.
Next, by taking the circuit of power factor correction is two-phase circuit of power factor correction as an example, the present invention is implemented
The operation principle of peak point current regulated value determination sub-module 72 described in example is introduced in detail：
Specifically, as shown in figure 9, it is the first electricity of the two-phase circuit of power factor correction described in the embodiment of the present invention
The waveform diagram of stream and the second electric current.Assuming that may include input voltage by the status signal that the sampling module 12 obtains
Uin, output voltage Uout, inductance transient current iL(i as shown in Figure 9L1And iL2) and input voltage zero passage detection letter
Number sign (Uin), inductive current zero passage detection signal sign (iL), then in the shape for receiving the transmission of the sampling module 12
After state signal, the peak point current can be calculated according to following steps and adjust for the peak point current regulated value determination sub-module 72
It is worth (as shown in Figure 10)：
Step S11 calculates the output voltage UoutWith output voltage a reference value Uout_setBetween difference；
The difference is input in corresponding voltage ring controller (i.e. PFC voltages ring controller), obtains by step S12
Corresponding regulated voltage signal Uch；
Step S13, by the regulated voltage signal UchAnd the input voltage UinIt is input to multiplier, to calculate
State the product of regulated voltage signal and the input voltage；
Step S14, according to the input voltage Uin, output voltage Uout, main inductance (or synchronous inductance) inductance value (such as
L1Or L2) and the first electric current iL1And the second electric current iL2Between phase difference, peak value electricity is calculated
Flow regulated value (such as Δ I).
Specifically, the phase difference between first electric current and second electric current can also be obtained according to following steps
(as shown in figure 11)：
S21 determines the cycle information of the first electric current and the second electric current.
For example, by timer (counter) Conter1 and Conter2 the first electric current and the second electricity can be recorded respectively
The cycle information of stream.
S22, phase difference between the first electric current and the second electric current is determined.
It should be noted that after the cycle information for determining first electric current and second electric current, it can basis
The value of the Conter1 and Conter2 that read determine the phase between first electric current and second electric current
Difference.
It should be noted that theoretically, in the case where misphase controls completion, the second electric current iL2Centre should be in
Electric current iL2_1Position, and at any time under, can meet shown in following formula 4 between Conter2_1 and the value of Conter1
Relationship：
Conter21=0.5*Conter1；Formula 4
And in the case where misphase control does not complete, the second electric current iL2And the first electric current iL1Between phase
Potential difference Δ T can be calculated by following formula 5：
Δ T=Conter2_1-Conter2=0.5*Conterl-Conter2；Formula 5
Further, in conjunction with the schematic diagram and 1~formula of formula 3 of foregoing Totem Pole PFC topologys, institute
It states Δ T and is also further represented as formula 6：
Wherein, the Δ I indicates the peak point current regulated value, and the Δ T indicates first electric current and described the
The phase difference of two electric currents, the UinIndicate the input voltage, the UoutIndicate the output voltage；The L indicates the master
The inductance value of inductance or the synchronous inductance.
So as to further obtain the calculating public affairs of the peak point current regulated value described in the embodiment of the present invention by the formula 6
Formula, i.e. following formula 7.That is, the peak point current regulated value determination sub-module 62 is particularly used in through public affairs below
Formula 7 determines the peak point current regulated value：
As shown in figure 12, after the peak point current regulated value is determined, further the peak point current can be adjusted
Value Δ I is added to through the peak point current a reference value iSA_setOn (the A points in such as Figure 12), to which new peak value electricity can be obtained
Flow a reference value iSB_set(the B points in such as Figure 12), thus the peak position of electric current becomes B points from A points.So, in C points
After, the first electric current iL1Just and intermediate current iL1_2It overlaps.That is, realizing misphase control.
Further, as shown in figure 13, the control signal determination sub-module 73, specifically may include second adder 131
And comparator 132, wherein：
The second adder 131, can be used for calculating the peak reference electric current and the peak value adjusts the sum of electric current
Value, and described and value is sent to the comparator 132；
The comparator 132, can be used for described in comparison and the size of value and the amplitude of second electric current, and according to than
Relatively result determines the control signal.
Such as, however, it is determined that described and value can then send out first control signal less than the amplitude of second electric current, such as high electricity
It is flat, however, it is determined that and value can then send out second control signal, such as low level, not to this not less than the amplitude of second electric current
It repeats.
As shown in the above, a kind of multiphase interleaving controller is provided in embodiments of the present invention, compared to existing
There is technology, the control module 13 of the multiphase interleaving controller described in the embodiment of the present invention is in addition to may include corresponding peak value
Current reference value determination sub-module 71 (being made of first adder 81, voltage ring controller 82 and multiplier 83) and control
Except signal determination sub-module 73 (being made of comparator 132) processed, it may also include peak point current regulated value determination sub-module 72, such as
It is the practical structures schematic diagram of the control module 13 described in the embodiment of the present invention shown in Figure 14.
That is, control module 13 described in the embodiment of the present invention is in addition to can be directly according to the peak value of synchronous inductance electricity
The amplitude for flowing the electric current of a reference value and the synchronous inductance determines corresponding control signal, and institute is based on to control drive module 14
It, can also be according to the PFC except the break-make for stating the switching device in control signal driving power factor correcting circuit
The status signal of circuit and default Setting signal calculate corresponding peak point current regulated value, with to the peak value being calculated
Current reference value is corrected, to when input voltage is distorted, be adjusted and be effectively controlled by closed loop, solved
The current ripples determined present in existing multiphase interleaving controller are larger, power grid practicability is poor and can not closed loop tune
The problem of section.Within the time less than a cycle, misphase control can be completed once clapping, fast response time carries real-time closed-loop
The effect of adjusting.
In the following, by taking a specific example as an example, to the work of the multiphase interleaving controller in the embodiment of the present invention
Make principle simply to be introduced：
For example, the model machine that an output of actual development is 3kW, is controlled, and institute using Totem Pole PFC topologys TCM
It is two-phase circuit of power factor correction to state circuit of power factor correction, and, the two-phase in the two-phase circuit of power factor correction
The measured waveform of electric current is as shown in figure 15 on inductance, specifically, the period t1=7.95us of the first electric current, the period of the second electric current
T2=7.84us can then obtain the periodic inequality Δ t=0.11us of the first electric current and the second electric current；Due to whole cycle tp=
15.79us, then the phase difference of the first electric current and the second electric current can beRelative to 180 ° of mark
Quasi- misphase phase difference, error are only 1.38%, thus have good misphase control ability.
The embodiment of the present invention proposes a kind of multiphase interleaving controller, it may include circuit of power factor correction, acquisition
Module, control module and drive module.Wherein：The acquisition module, the shape for acquiring the circuit of power factor correction
State signal, and the status signal is sent to the control module；The status signal include input voltage, output voltage,
Main inductance, synchronous inductance, the first electric current for flowing through the main inductance and the second electric current for flowing through the synchronous inductance；The control
Molding block, for according to the status signal that receives and default Setting signal, determining corresponding control signal, and by institute
It states control signal and is sent to the drive module；The drive module, for according to the control signal that receives, determine with
The corresponding drive signal of the control signal, and the drive signal is sent to each in the circuit of power factor correction
The control terminal of switching device, to control the break-make of each switching device in the circuit of power factor correction.Compared to existing skill
Art, the multiphase interleaving controller provided in the embodiment of the present invention can according in the status signal the first electric current and
The peak point current regulated value for peak point current to be adjusted is calculated in the phase information of second electric current, thus is inputting
When voltage is distorted, it can be adjusted and be effectively controlled by closed loop, solve existing multiphase interleaving controller
Existing current ripples are larger, power grid practicability is poor and can not closed loop adjust the problem of.
Embodiment two：
Based on the inventive concept being identical with the embodiment of the present invention, second embodiment of the present invention provides a kind of multiphase interleavings
Control method is as shown in figure 16 the flow diagram of the multiphase interleaving control method described in the embodiment of the present invention.
Specifically, as shown in Figure 16, the multiphase interleaving control method may include following steps：
Step 1601：Acquire the status signal of the circuit of power factor correction；
Step 1602：According to the status signal and default Setting signal, determine corresponding peak point current a reference value with
And peak point current regulated value, and it is based on the peak point current a reference value, the peak point current regulated value and the second electric current, it obtains
Corresponding control signal；
Step 1603：According to the control signal, drive signal corresponding with the control signal is determined, and according to institute
State the break-make for each switching device that drive signal controls in the circuit of power factor correction；Wherein, the status signal includes
It input voltage, output voltage, main inductance, synchronous inductance, the first electric current for flowing through the main inductance and flows through and described synchronizes electricity
Second electric current of sense.
That is, in embodiments of the present invention, the multiphase interleaving control method can acquire the power factor
The status signal of correcting circuit；And it can determine corresponding peak point current base according to the status signal and default Setting signal
Quasi- value and peak point current regulated value, and based on the peak point current a reference value, the peak point current regulated value and described the
Two electric currents obtain controlling signal accordingly；And it can determine drive corresponding with the control signal according to the control signal
Dynamic signal, and control according to the drive signal break-make of each switching device in the circuit of power factor correction.Compared to
The prior art, the multiphase interleaving control method provided in the embodiment of the present invention can be according to first in the status signal
The peak point current regulated value for peak point current to be adjusted is calculated in the phase information of electric current and the second electric current, because
And when input voltage is distorted, it can be adjusted and be effectively controlled by closed loop, solve existing multiphase staggeredly simultaneously
Current ripples present in controller are larger, power grid practicability is poor and can not closed loop the problem of adjusting.
Specifically, according to the status signal and default Setting signal, corresponding control signal is determined, it may include：
According to the input voltage, the output voltage and preset output voltage a reference value, the peak value electricity is calculated
Flow a reference value；
According to the input voltage, output voltage, synchronous inductance, the phase information of first electric current and described second
The phase information of electric current calculates the peak point current regulated value；
According to the peak point current a reference value, the amplitude information of the peak point current regulated value and second electric current,
Determine the control signal.
Further, according to the input voltage, the output voltage and preset output voltage a reference value, institute is calculated
State peak point current a reference value, it may include：
Calculate the difference between the output voltage a reference value and the output voltage；
According to the difference, the regulated voltage signal is calculated；
The product of the regulated voltage signal and the input voltage is calculated, and using the product as peak value electricity
Flow a reference value.
Preferably, the peak point current regulated value is determined by following first formula：
Wherein, the Δ I indicates the peak point current regulated value, and the Δ T indicates first electric current and described the
The phase difference of two electric currents, the UinIndicate the input voltage, the UoutIndicate the output voltage；The L indicates the master
The inductance value of inductance or the synchronous inductance.
Further, according to the control signal, drive signal corresponding with the control signal is determined, it may include：
Calculate the peak reference electric current and the peak value adjust electric current and value；
Compare the size of described and value and the amplitude of second electric current, and determines that the control is believed according to comparison result
Number.
Second embodiment of the present invention provides a kind of multiphase interleaving control methods, can acquire the PFC electricity
The status signal on road；And can according to the status signal and default Setting signal, determine corresponding peak point current a reference value with
And peak point current regulated value, and it is based on the peak point current a reference value, the peak point current regulated value and second electric current,
It obtains controlling signal accordingly；And can determine drive signal corresponding with the control signal according to the control signal,
And the break-make of each switching device in the circuit of power factor correction is controlled according to the drive signal.Compared to existing skill
Art, the multiphase interleaving control method provided in the embodiment of the present invention can according to the first electric current in the status signal with
And second electric current phase information, the peak point current regulated value for peak point current to be adjusted is calculated, thus defeated
When entering voltage and being distorted, it can be adjusted and be effectively controlled by closed loop, solve existing multiphase interleaving control
Current ripples present in device are larger, power grid practicability is poor and can not closed loop the problem of adjusting.
It will be understood by those skilled in the art that the embodiment of the present invention can be provided as method, apparatus (equipment) or computer journey
Sequence product.Therefore, complete hardware embodiment, complete software embodiment or combining software and hardware aspects can be used in the present invention
The form of embodiment.Moreover, the present invention can be used in one or more wherein include computer usable program code calculating
The computer program implemented in machine usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow chart of device (equipment) and computer program product
And/or block diagram describes.It should be understood that each flow in flowchart and/or the block diagram can be realized by computer program instructions
And/or the combination of the flow and/or box in box and flowchart and/or the block diagram.These computer programs can be provided to refer to
Enable the processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to generate
One machine so that by the instruction that computer or the processor of other programmable data processing devices execute generate for realizing
The device for the function of being specified in one flow of flow chart or multiple flows and/or one box of block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction generation stored in the computer readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of 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 count
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, in computer or
The instruction executed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows 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, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of multiphase interleaving controller, which is characterized in that including circuit of power factor correction, acquisition module, control mould
Block and drive module, wherein：
The acquisition module, the status signal for acquiring the circuit of power factor correction, and the status signal is sent
To the control module；The status signal includes input voltage, output voltage, main inductance, synchronous inductance, flows through the main electricity
First electric current of sense and the second electric current for flowing through the synchronous inductance；
The control module, for according to the status signal and default Setting signal received, determining corresponding peak value
Current reference value and peak point current regulated value, and based on the peak point current a reference value, the peak point current regulated value and
Second electric current obtains controlling signal accordingly, and the control signal is sent to the drive module；
The drive module, for according to the control signal received, determining driving corresponding with the control signal
Signal, and the control terminal for each switching device drive signal being sent in the circuit of power factor correction, with control
The break-make of each switching device in the circuit of power factor correction.
2. multiphase interleaving controller as described in claim 1, which is characterized in that the control module specifically includes peak
It is worth current reference value determination sub-module, peak point current regulated value determination sub-module and control signal determination sub-module, wherein：
The peak point current a reference value determination sub-module, for according to the input voltage, the output voltage and preset
Output voltage a reference value calculates the peak point current a reference value, and the peak point current a reference value is sent to the control and is believed
Number determination sub-module；
The peak point current regulated value determination sub-module, for according to the input voltage, output voltage, synchronous inductance, described
The phase information of the phase information of first electric current and second electric current calculates the peak point current regulated value, and will be described
Peak point current regulated value is sent to the control signal determination sub-module；
The control signal determination sub-module, for according to the peak point current a reference value, the peak point current regulated value and
The amplitude information of second electric current determines the control signal, and the control signal is sent to the drive module.
3. multiphase interleaving controller as claimed in claim 2, which is characterized in that the peak point current a reference value is true
Stator modules specifically include first adder, voltage ring controller and multiplier, wherein：
The first adder for receiving the output voltage a reference value and the output voltage, and calculates the output
Difference between voltage reference value and the output voltage, and the difference is exported to the voltage ring controller；
The voltage ring controller, for according to the difference, calculating the regulated voltage signal, and the voltage is adjusted and is believed
Number it is sent to the multiplier；
The multiplier, the product for calculating the regulated voltage signal and the input voltage, and the product is made
For the peak point current a reference value, and the peak point current a reference value is sent to the control signal determination sub-module.
4. multiphase interleaving controller as claimed in claim 2, which is characterized in that the peak point current regulated value determines son
Module is specifically used for determining the peak point current regulated value by following first formula：
Wherein, the Δ I indicates that the peak point current regulated value, the Δ T indicate first electric current and second electricity
The phase difference of stream, the UinIndicate the input voltage, the UoutIndicate the output voltage；The L indicates the main inductance
Or the inductance value of the synchronous inductance.
5. multiphase interleaving controller as claimed in claim 2, which is characterized in that the control signal determination sub-module,
Second adder and comparator are specifically included, wherein：
The second adder, for calculating the peak reference electric current and the peak value adjust electric current and value, and by institute
It states and value is sent to the comparator；
The comparator, for comparing described and value and the amplitude of second electric current size, and it is true according to comparison result
The fixed control signal.
6. a kind of multiphase interleaving control method, which is characterized in that including：
Acquire the status signal of the circuit of power factor correction；
According to the status signal and default Setting signal, determine that corresponding peak point current a reference value and peak point current are adjusted
Value, and it is based on the peak point current a reference value, the peak point current regulated value and the second electric current, it obtains controlling letter accordingly
Number；
According to the control signal, drive signal corresponding with the control signal is determined, and according to the drive signal control
Make the break-make of each switching device in the circuit of power factor correction；
Wherein, the status signal include input voltage, output voltage, main inductance, synchronous inductance, flow through the main inductance
One electric current and the second electric current for flowing through the synchronous inductance.
7. multiphase interleaving control method as claimed in claim 6, which is characterized in that according to the status signal and in advance
If Setting signal, corresponding control signal is determined, including：
According to the input voltage, the output voltage and preset output voltage a reference value, the peak point current base is calculated
Quasi- value；
According to the input voltage, output voltage, synchronous inductance, the phase information of first electric current and second electric current
Phase information, calculate the peak point current regulated value；
According to the peak point current a reference value, the amplitude information of the peak point current regulated value and second electric current, determine
The control signal.
8. multiphase interleaving control method as claimed in claim 7, which is characterized in that according to the input voltage, described
Output voltage and preset output voltage a reference value calculate the peak point current a reference value, including：
Calculate the difference between the output voltage a reference value and the output voltage；
According to the difference, the regulated voltage signal is calculated；
The product of the regulated voltage signal and the input voltage is calculated, and using the product as the peak point current base
Quasi- value.
9. multiphase interleaving control method as claimed in claim 7, which is characterized in that the peak point current regulated value is logical
Cross what following first formula determined：
Wherein, the Δ I indicates that the peak point current regulated value, the Δ T indicate first electric current and second electricity
The phase difference of stream, the UinIndicate the input voltage, the UoutIndicate the output voltage；The L indicates the main inductance
Or the inductance value of the synchronous inductance.
10. multiphase interleaving control method as claimed in claim 6, which is characterized in that according to the control signal, determine
Drive signal corresponding with the control signal, including：
Calculate the peak reference electric current and the peak value adjust electric current and value；
Compare the size of described and value and the amplitude of second electric current, and the control signal is determined according to comparison result.
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| CN110474526A (en) * | 2019-08-07 | 2019-11-19 | 苏州汇川联合动力系统有限公司 | Current conversion circuit and charging unit |
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| CN114157178A (en) * | 2021-11-01 | 2022-03-08 | 西南交通大学 | Novel traction converter |
| CN113890328A (en) * | 2021-12-08 | 2022-01-04 | 成都天核科技有限公司 | Three-phase staggered parallel PFC circuit based on GaN power device |
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