CN103532367A - interleaved PFC control method and device - Google Patents
interleaved PFC control method and device Download PDFInfo
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Abstract
The invention discloses a staggered PFC control method and a device, wherein the method comprises the following steps: obtaining the current of a branch where two inductors are positioned in the staggered PFC circuit; and under the condition that the difference of the currents of the branches where the two inductors are located is greater than or equal to a preset threshold value, adjusting the duty ratio of the branches where the two inductors are located to enable the difference of the currents to be smaller than the preset threshold value. The invention solves the problems that the current imbalance of the interleaved PFC circuit in the related technology can possibly cause the whole failure of the circuit and the poor reliability of the circuit, so that the PFC control is more accurate and the reliability of the circuit is improved.
Description
Technical field
The present invention relates to circuit field, relate in particular to a kind of alternating expression power factor correction (Power Factor Correction, referred to as PFC) control method and device.
Background technology
Current interleaved PFC adopts symmetrical Boost booster circuit, by detecting two switching tubes (being generally IGBT or MOSFET) electric current or detecting total current and carry out computing.Due to when reactor inductance amount is not identical, may cause current imbalance, cause a way switch tube current excessive, when electric current difference acquires a certain degree, may burn out switching tube, thereby make circuit global failure.
For (the Power Factor Correction of the alternating expression power factor correction in correlation technique, referred to as PFC) the current imbalance degree of circuit seriously likely causes circuit global failure, the problem that circuit reliability is poor, not yet proposes effective solution.
Summary of the invention
Main purpose of the present invention is to provide a kind of interleaved PFC control method and device, at least to solve the current imbalance of the interleaved PFC circuit in correlation technique, likely causes circuit global failure, the problem that circuit reliability is poor.
According to an aspect of the present invention, provide a kind of interleaved PFC control method, having comprised: the electric current that obtains two inductance place branch roads in interleaved PFC circuit; In the situation that the difference between currents of described two inductance place branch roads is more than or equal to predetermined threshold, adjust the duty ratio of described two inductance place branch roads, make described difference between currents be less than described predetermined threshold.
Preferably, the electric current that obtains two inductance place branch roads in interleaved PFC circuit comprises: measure the electric current of one of them inductance place branch road in described interleaved PFC circuit, and the total input current of described interleaved PFC circuit; The electric current that calculates another inductance place branch road in described interleaved PFC circuit is: the difference between currents of described total input current and described one of them inductance place branch road.
Preferably, adjusting the duty ratio of described two inductance place branch roads, making before described difference between currents is less than described predetermined threshold, also to comprise: input current and the output voltage of measuring described interleaved PFC circuit; According to described input current and described output voltage, estimate the input voltage of described interleaved PFC circuit.
Preferably, according to described input current, estimate that the input voltage of described interleaved PFC circuit comprises: according to described input current and described output voltage, by state space equation and observing matrix, estimate the input voltage of described interleaved PFC circuit.
Preferably, adjust the duty ratio of described two inductance place branch roads, make described difference between currents be less than described predetermined threshold and comprise: according to described difference between currents, obtain the first duty ratio; According to described the first duty ratio, the duty ratio of described two inductance place branch roads is adjusted respectively, made described difference between currents be less than described predetermined threshold.
Preferably, by described the first duty ratio, the duty ratio of described two inductance place branch roads is adjusted respectively, making described difference between currents be less than described predetermined threshold comprises: the duty ratio of the larger branch road of the electric current of place branch road in described two inductance is reduced to described the first duty ratio, and the duty ratio of another branch road is increased to described the first duty ratio.
According to a further aspect in the invention, provide a kind of interleaved PFC control device, having comprised: acquisition module, for obtaining the electric current of two inductance place branch roads of interleaved PFC circuit; Adjusting module, in the situation that the difference between currents of described two inductance place branch roads is more than or equal to predetermined threshold, adjusts the duty ratio of described two inductance place branch roads, makes described difference between currents be less than described predetermined threshold.
Preferably, described acquisition module comprises: measuring unit, and for measuring the electric current of one of them inductance place branch road of described interleaved PFC circuit, and the total input current of described interleaved PFC circuit; The first computing unit, for calculating the electric current of another inductance place branch road of described interleaved PFC circuit is: the difference between currents of described total input current and described one of them inductance place branch road.
Preferably, described device also comprises: measurement module, for measuring input current and the output voltage of described interleaved PFC circuit; Estimation block, for estimating the input voltage of described interleaved PFC circuit according to described input current and described output voltage.
Preferably, described estimation block comprises: evaluation unit, for according to described input current and described output voltage, by state space equation and observing matrix, estimate the input voltage of described interleaved PFC circuit.
Preferably, described adjusting module comprises: the second computing unit, for obtaining the first duty ratio according to described difference between currents; Adjustment unit, for the duty ratio of described two inductance place branch roads being adjusted respectively according to described the first duty ratio, makes described difference between currents be less than described predetermined threshold.
Preferably, described adjustment unit is also for the duty ratio of the larger branch road of the electric current of described two inductance place branch roads is reduced to described the first duty ratio, and the duty ratio of another branch road is increased to described the first duty ratio.
According to technical scheme of the present invention, adopt the electric current that obtains two inductance place branch roads in interleaved PFC circuit; In the situation that the difference between currents of these two inductance place branch roads is more than or equal to predetermined threshold, adjust the duty ratio of these two inductance place branch roads, make difference between currents be less than the mode of this predetermined threshold, the current imbalance that has solved the interleaved PFC circuit in correlation technique likely causes circuit global failure, the poor problem of circuit reliability, PFC is controlled more accurate, improved circuit reliability.
Accompanying drawing explanation
Figure of description is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is according to the flow chart of the interleaved PFC control method of the embodiment of the present invention;
Fig. 2 is according to the structured flowchart of the interleaved PFC control device of the embodiment of the present invention;
Fig. 3 is according to the preferred structure block diagram of the interleaved PFC control device of the embodiment of the present invention;
Fig. 4 is the preferred structure block diagram according to the estimation block of the embodiment of the present invention;
Fig. 5 is the preferred structure block diagram according to the adjusting module of the embodiment of the present invention;
Fig. 6 is according to the hardware elementary diagram of the interleaved PFC control circuit of the embodiment of the present invention one;
Fig. 7 is the overview flow chart of controlling according to the interleaved PFC of the embodiment of the present invention one;
Fig. 8 is the duty ratio compensation flow chart according to the embodiment of the present invention one;
Fig. 9 is the PFC control block diagram according to the embodiment of the present invention two;
Figure 10 is the input voltage observer block diagram according to the embodiment of the present invention two;
Figure 11 is the preferred structure block diagram according to the acquisition module of the embodiment of the present invention.
Embodiment
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
A kind of interleaved PFC control method is provided in the present embodiment, and Fig. 1 is that as shown in Figure 1, the method comprises the steps: according to the flow chart of the interleaved PFC control method of the embodiment of the present invention
Step S102, obtains the electric current of two inductance place branch roads in interleaved PFC circuit;
Step S104, in the situation that the difference between currents of these two inductance place branch roads is more than or equal to predetermined threshold, adjusts the duty ratio of these two inductance place branch roads, makes difference between currents be less than this predetermined threshold.
The present embodiment passes through above-mentioned steps, in the situation that the difference between currents of two inductance place branch roads of interleaved PFC circuit is more than or equal to predetermined threshold, by adjusting the mode of duty ratio, make this difference between currents be less than this predetermined threshold, for example this difference between currents is adjusted into 0, thereby the difference between currents that guarantees two inductance place branch roads of interleaved PFC circuit can be within safe range, even when reactor inductance amount is not identical, also can make current balance type, can not burn out switching tube, the current imbalance that has solved the interleaved PFC circuit in correlation technique likely causes circuit global failure, the problem that circuit reliability is poor, PFC is controlled more accurate, improve circuit reliability.
Preferably, when obtaining the electric current of above-mentioned two inductance place branch roads, can measure total input current of this PFC and the electric current of a branch road wherein, and then the electric current that calculates another branch road is: the difference between currents of total input current and one of them inductance place branch road.In this way, because total input current is known, conventionally only need to measure the wherein electric current of a branch road, reduced cost.
Adjusting duty ratio with before compensating the electric current of two inductance place branch roads, need to obtain the input voltage of this interleaved PFC circuit, this input voltage can obtain by the mode of measuring.As a kind of preferred implementation, can also be after measuring the input current and output voltage of interleaved PFC circuit, according to this input current and output voltage, estimate the input voltage of interleaved PFC circuit.In this way, can, without input voltage is measured, save cost.
Preferably, the mode of input voltage being estimated according to input current and output voltage can be according to input current, by state space equation and observing matrix, estimates the input voltage of interleaved PFC circuit.Which is simple and easy to do, practical.
As a kind of preferred implementation, the mode that adjustment duty ratio makes difference between currents be less than predetermined threshold can be first according to the difference between currents of two inductance place branch roads, to calculate the first duty ratio (claiming again to adjust duty cycle delta D), then according to this first duty ratio, duty ratio to above-mentioned two inductance place branch roads is adjusted respectively, thereby makes difference between currents be less than predetermined threshold.
For example, the duty ratio of the larger branch road of the electric current of place branch road in two inductance can be reduced to the first duty ratio, and the duty ratio of another branch road is increased to the first duty ratio.The electric current of supposing the first inductance L 1 place branch road is i1, duty ratio is D1, the electric current of the second inductance L 2 place branch roads is i2, duty ratio is D2, i1 > i2, first according to the difference of i1-i2, calculate to obtain Δ D, if desired the difference of i1 and i2 is adjusted into 0, D1 can be adjusted into D1-Δ D, D2 is adjusted into D2+ Δ D.
Corresponding to said method, the present embodiment also provides a kind of interleaved PFC control device, and this device is used for realizing above-described embodiment and preferred implementation, has carried out repeating no more of explanation.As used below, the combination of software and/or the hardware of predetermined function can be realized in term " module ".Although the described device of following examples is preferably realized with software, hardware, or the realization of the combination of software and hardware also may and be conceived.
Fig. 2 is according to the structured flowchart of the interleaved PFC control device of the embodiment of the present invention, and as shown in Figure 2, this device comprises: acquisition module 22 and adjusting module 24, be elaborated to modules below.
Acquisition module 22, for obtaining the electric current of two inductance place branch roads of interleaved PFC circuit; Adjusting module 24, is connected with acquisition module 22, in the situation that the difference between currents of these two inductance place branch roads is more than or equal to predetermined threshold, adjusts the duty ratio of these two inductance place branch roads, makes difference between currents be less than this predetermined threshold.
The present embodiment is by above-mentioned module, in the situation that the difference between currents of two inductance place branch roads of the interleaved PFC circuit that acquisition module 22 gets is more than or equal to predetermined threshold, the mode of adjusting duty ratio by adjusting module 24 makes this difference between currents be less than this predetermined threshold, for example this difference between currents is adjusted into 0, thereby the difference between currents that guarantees two inductance place branch roads of interleaved PFC circuit can be within safe range, even when reactor inductance amount is not identical, also can make current balance type, can not burn out switching tube, the current imbalance that has solved the interleaved PFC circuit in correlation technique likely causes circuit global failure, the problem that circuit reliability is poor, PFC is controlled more accurate, improve circuit reliability.
Figure 11 is according to the preferred structure block diagram of the acquisition module 22 of the embodiment of the present invention, as shown in figure 11, acquisition module 22 can comprise: measuring unit 222, and for measuring the electric current of one of them inductance place branch road of interleaved PFC circuit, and the total input current of interleaved PFC circuit; The first computing unit 224, is connected with measuring unit 222, is: the difference between currents of total input current and one of them inductance place branch road for calculating the electric current of another inductance place branch road of interleaved PFC circuit.
Fig. 3 is according to the preferred structure block diagram of the interleaved PFC control device of the embodiment of the present invention, and as shown in Figure 3, this device can also comprise: measurement module 32, for measuring input current and the output voltage of interleaved PFC circuit; Estimation block 34, is connected with measurement module 32 with adjusting module 24, for according to the input voltage of input current and output voltage estimation interleaved PFC circuit.
Fig. 4 is according to the preferred structure block diagram of the estimation block 34 of the embodiment of the present invention, as shown in Figure 4, this estimation block 34 can comprise: evaluation unit 342, for according to input current and output voltage, by state space equation and observing matrix, estimate the input voltage of interleaved PFC circuit.
Fig. 5 is according to the preferred structure block diagram of the adjusting module 24 of the embodiment of the present invention, and as shown in Figure 5, this adjusting module 24 can comprise: the second computing unit 242, for obtain the first duty ratio according to difference between currents; Adjustment unit 244, is connected with computing unit 242, for according to this first duty ratio, the duty ratio of two inductance place branch roads being adjusted respectively, makes difference between currents be less than predetermined threshold.
Preferably, adjustment unit 244 can also be for the duty ratio of the larger branch road of the electric current of two inductance place branch roads is reduced to the first duty ratio, and the duty ratio of another branch road is increased to the first duty ratio.
Below in conjunction with preferred embodiments and drawings, the implementation procedure of above-described embodiment and preferred implementation is elaborated.
Embodiment mono-
A kind of control method of asymmetric interleaved PFC is provided in the present embodiment, the method is by detect electric current and the total current of a road IGBT simultaneously, calculate two electric currents on inductance, and the electric current detecting is compensated, adjust suitable duty ratio, thereby control two difference between currents on inductance and can not exceed threshold value (for example, exporting suitable duty ratio by DSP equates two branch currents).Adopt the method can make PFC control more accurate, improve circuit reliability.In addition, in the situation that inductance value deviation is larger, also can use interleaved PFC scheme, further improve circuit reliability.
Fig. 6 is according to the hardware elementary diagram of the interleaved PFC control circuit of the embodiment of the present invention one, and as shown in Figure 6, the left side is rectifier bridge, and the right is interleaved PFC, and L1, L2 are inductance, and Q1, Q2 are switching tube, and D1, D2 are diode.DSP is Gather and input electric current, switching tube electric current and output voltage simultaneously, carries out D/A conversion and controls with algorithm, pulse width modulation (Pulse Width Modulation, referred to as the PWM) signal that output contains duty cycle information.
The operation principle of this interleaved PFC control circuit is as follows: Q1 manages conducting, L1 storage power, and Q1 manages shutoff, and L1 is released energy by D1, gives capacitor charging.Second branch road in like manner.
Fig. 7 is the overview flow chart of controlling according to the interleaved PFC of the embodiment of the present invention one, and as shown in Figure 7, this flow process comprises the steps:
Step S702, PFC initialization.
Step S704, electric current and the PFC output voltage of sampling input current ，Yi road IGBT, amplify sampled value through operational amplifier, send into DSP and carry out algorithm process.
Step S706, estimates input voltage by state observer, and the embodiment of estimation can have multiple, and the input voltage estimation mode in this preferred embodiment can be referring to the 4th part (input voltage estimation) of embodiment bis-.
Step S708, calculates the value of Vp by electric current loop.
Step S710, calculates by Voltage loop the current reference amount that load needs.
Step S712, due to Vin=SLi
in+ Vp, Vin can be drawn by state observer, therefore draws Vp=Vin-SLi
in, Vp is IGBT emitter and inter-collector voltage.According to the concept Vp=of average current (1-D) Vdc,
calculate the pwm signal that contains duty cycle information, then duty ratio is compensated.
Fig. 8 is the duty ratio compensation flow chart according to the embodiment of the present invention one, as shown in Figure 8, and because L1 and L2 there are differences, export identical duty ratio, may cause actual current unequal, now just need to adjust duty ratio according to the value of inductive current, so that PFC electric current is compensated.Referring to the hardware elementary diagram of Fig. 6, this duty ratio compensation flow process comprises the steps:
Step S802, when Q1 conducting, sampling i
q1with i
in.
Step S804, works as i
q1when detection electric current is non-vanishing, the electric current that now flows through IGBT is the current i of inductance L 1
l1=i
q1.
Step S806, the electric current of inductance L 2, is i
l2=i
in-i
q1.
Step S808, obtains the difference i of the detection electric current of L1 and L2
l1-i
l2.
Step S810, by the difference i of the detection electric current of L1 and L2
l1-i
l2as regulated quantity, compare with reference quantity 0, by PI, regulate, draw and adjust duty cycle delta D.
Step S812, duty cycle delta D is adjusted in output.
Step S814, makes to equate with the electric current of inductance L 2 by inductance L 1 after adjustment duty ratio.Here with initial D1 and D2, equate, being D is that example describes, the D1=D-Δ D after adjusting, D2=D+ Δ D.
Embodiment bis-
One, PFC hardware components
Referring to Fig. 6, the left side is rectifier bridge, and the right is interleaved PFC, and L1, L2 are inductance, and Q1, Q2 are switching tube, and D1, D2 are diode.DSP Gather and input electric current, switching tube electric current and output voltage, carry out D/A conversion and control with algorithm.Its operation principle is as follows: Q1 manages conducting, L1 storage power, and Q1 manages shutoff, and L1 is released energy by D1, gives capacitor charging.Second branch road in like manner.
Two, PFC control block diagram
Fig. 9 is the PFC control block diagram according to the embodiment of the present invention two, as shown in Figure 9, PFC algorithm comprises two control loop parts (interior circular current ring and outer shroud Voltage loop) and current compensation loops: (1) interior circular current ring, makes PFC input current follow input voltage, and calculate duty ratio; (2) outer shroud Voltage loop, calculates the size of input current by load, and makes PFC output voltage be elevated to a steady state value; (3) current compensation loop, exports Δ D by current compensation.Three loops all adopt pid control algorithm.Subscript * represents reference quantity, and ^ represents to estimate.Left side is control loop part, and right side is circuit hardware actuator.
Parameter is as follows:
for input voltage estimated value, K is constant,
for busbar voltage reference value, v
dcfor sampled value, P
infor input power, P
outfor power output,
for input power reference value,
for input current reference value,
for IGBT emitter and inter-collector voltage reference value.
The implementation method of duty ratio compensation is as follows, by the DSP i that samples
inwith v
dcvalue, sampling i
inrear use PID controls, and makes i
inphase place is followed
estimator, P
in=v
in* i
in, by capacitor charge and discharge, drawn and v
dcrelation, by PID, control and make v
dcvoltage be a steady state value, according to the conservation of energy, boost booster circuit, when IGBT opens, inductance storage power, IGBT closes and has no progeny, and passes through diode, to electric capacity and load, release energy, by pid algorithm, draw the service time that this is suitable, calculate duty ratio.By
draw the value of duty ratio D.By current compensation loop, draw Δ D again, electric current is compensated.Here with initial D1 and D2, equate, being D is that example describes, the D1=D-Δ D after adjusting, D2=D+ Δ D.
Three, program overall flow figure
Referring to Fig. 8, interleaved PFC control flow is whole as follows: PFC initialization, sampling input current, the electric current of one road GBT and PFC output voltage, amplify sampled value through operational amplifier, send into DSP and carry out algorithm process, by state observer, input voltage is estimated, through Voltage loop, calculate the size of current that load needs, by electric current loop, calculate the value of Vp, due to Vin=SLi
in+ Vp, Vin can be drawn by state observer, therefore draws Vp=Vin-SLi
in, Vp is IGBT emitter and inter-collector voltage.According to the concept Vp=of average current (1-D) Vdc,
calculate the pwm signal that contains duty cycle information, finally duty ratio is compensated.Concrete duty ratio compensation process is shown in the 5th part.
Four, input voltage is estimated
By the hardware components of Fig. 6, can obtain state space equation is:
Wherein L is inductance value.
Observing matrix equation is:
D, for observation gain matrix, draws error d
1with error d
2be that Observable draws
Figure 10 is the input voltage observer block diagram according to the embodiment of the present invention two, as shown in figure 10, is getting i
inafterwards, according to error d
1with error d
2, inductance L and Laplce's constant S, can draw the input voltage of estimation
Five, duty ratio compensation
Referring to Fig. 8, duty ratio compensation flow process is as follows: because L1 and L2 there are differences, export identical duty ratio, may cause actual current also unequal, now just need to adjust duty ratio, according to the value of inductive current, compensate.From hardware elementary diagram, work as i
q1when detection electric current is non-vanishing, the electric current that now flows through IGBT is the current i of inductance L 1
l1=i
q1, the electric current of inductance L 2 is i
l2=i
in-i
q1.Difference i by the detection electric current of L1 and L2
l1-i
l2as regulated quantity, compare with reference quantity IRef=0, by PI, regulate, draw and adjust duty cycle delta D, after adjustment duty ratio, make to equate with the electric current of inductance L 2 by inductance L 1.Here with initial D1 and D2, equate, being D is that example describes, the D1=D-Δ D after adjusting, D2=D+ Δ D.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, or they are made into respectively to each integrated circuit modules, or a plurality of modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
1. an alternating expression power factor correction PFC control method, is characterized in that, comprising:
Obtain the electric current of two inductance place branch roads in interleaved PFC circuit;
In the situation that the difference between currents of described two inductance place branch roads is more than or equal to predetermined threshold, adjust the duty ratio of described two inductance place branch roads, make described difference between currents be less than described predetermined threshold.
2. method according to claim 1, is characterized in that, the electric current that obtains two inductance place branch roads in interleaved PFC circuit comprises:
Measure the electric current of one of them inductance place branch road in described interleaved PFC circuit, and the total input current of described interleaved PFC circuit;
The electric current that calculates another inductance place branch road in described interleaved PFC circuit is: the difference between currents of described total input current and described one of them inductance place branch road.
3. method according to claim 1, is characterized in that, is adjusting the duty ratio of described two inductance place branch roads, makes before described difference between currents is less than described predetermined threshold, also to comprise:
Measure input current and the output voltage of described interleaved PFC circuit;
According to described input current and described output voltage, estimate the input voltage of described interleaved PFC circuit.
4. method according to claim 3, is characterized in that, estimates that the input voltage of described interleaved PFC circuit comprises according to described input current:
According to described input current and described output voltage, by state space equation and observing matrix, estimate the input voltage of described interleaved PFC circuit.
5. according to the method described in any one in claim 1 to 4, it is characterized in that, adjust the duty ratio of described two inductance place branch roads, make described difference between currents be less than described predetermined threshold and comprise:
According to described difference between currents, obtain the first duty ratio;
According to described the first duty ratio, the duty ratio of described two inductance place branch roads is adjusted respectively, made described difference between currents be less than described predetermined threshold.
6. method according to claim 5, is characterized in that, by described the first duty ratio, the duty ratio of described two inductance place branch roads is adjusted respectively, makes described difference between currents be less than described predetermined threshold and comprises:
The duty ratio of the larger branch road of the electric current of place branch road in described two inductance is reduced to described the first duty ratio, and the duty ratio of another branch road is increased to described the first duty ratio.
7. an alternating expression power factor correction PFC control device, is characterized in that, comprising:
Acquisition module, for obtaining the electric current of two inductance place branch roads of interleaved PFC circuit;
Adjusting module, in the situation that the difference between currents of described two inductance place branch roads is more than or equal to predetermined threshold, adjusts the duty ratio of described two inductance place branch roads, makes described difference between currents be less than described predetermined threshold.
8. device according to claim 7, is characterized in that, described acquisition module comprises:
Measuring unit, for measuring the electric current of one of them inductance place branch road of described interleaved PFC circuit, and the total input current of described interleaved PFC circuit;
The first computing unit, for calculating the electric current of another inductance place branch road of described interleaved PFC circuit is:
The difference between currents of described total input current and described one of them inductance place branch road.
9. device according to claim 7, is characterized in that, described device also comprises:
Measurement module, for measuring input current and the output voltage of described interleaved PFC circuit;
Estimation block, for estimating the input voltage of described interleaved PFC circuit according to described input current and described output voltage.
10. device according to claim 9, is characterized in that, described estimation block comprises:
Evaluation unit, for according to described input current and described output voltage, estimates the input voltage of described interleaved PFC circuit by state space equation and observing matrix.
11. according to the device described in any one in claim 7 to 10, it is characterized in that, described adjusting module comprises:
The second computing unit, for obtaining the first duty ratio according to described difference between currents;
Adjustment unit, for the duty ratio of described two inductance place branch roads being adjusted respectively according to described the first duty ratio, makes described difference between currents be less than described predetermined threshold.
12. devices according to claim 11, it is characterized in that, described adjustment unit is also for the duty ratio of the larger branch road of the electric current of described two inductance place branch roads is reduced to described the first duty ratio, and the duty ratio of another branch road is increased to described the first duty ratio.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113202A (en) * | 2014-07-23 | 2014-10-22 | 珠海格力电器股份有限公司 | Two-way staggered PFC current balance circuit and air conditioner |
| CN104135002A (en) * | 2014-07-11 | 2014-11-05 | 邯郸美的制冷设备有限公司 | Staggered power factor corrector |
| CN106160451A (en) * | 2016-08-01 | 2016-11-23 | 上海交通大学 | Three close-loop control power factor corrector and control method, supporting wireless charging circuit |
| CN106533196A (en) * | 2016-12-16 | 2017-03-22 | 上海三菱电机·上菱空调机电器有限公司 | Frequency conversion circuit with interlaced mode full PAM control mode and deviation inhibition method thereof |
| CN106787795A (en) * | 2016-12-16 | 2017-05-31 | 上海三菱电机·上菱空调机电器有限公司 | The method that a kind of frequency changer circuit and its deviation with interleaving mode suppress |
| CN108173427A (en) * | 2017-12-14 | 2018-06-15 | 珠海格力电器股份有限公司 | Control method and device of power factor correction circuit, storage medium and electric appliance |
| CN108254675A (en) * | 2018-03-14 | 2018-07-06 | 奥克斯空调股份有限公司 | Pfc circuit failure detector, method and convertible frequency air-conditioner |
| US10141848B2 (en) | 2014-07-11 | 2018-11-27 | Midea Group Co., Ltd. | Interleaved power factor corrector |
| CN109039135A (en) * | 2018-08-31 | 2018-12-18 | 长沙威克电力技术科技有限公司 | It is declined the sliding formwork current-sharing control method of inverter based on interleaving inverse excitation |
| CN110071628A (en) * | 2019-05-24 | 2019-07-30 | 珠海格力电器股份有限公司 | Interleaved PFC current control method, control circuit and variable frequency air conditioner |
| CN111835192A (en) * | 2020-07-15 | 2020-10-27 | 苏州浪潮智能科技有限公司 | PFC zero crossing point DC bias optimization control method, device, equipment and medium |
| CN112803748A (en) * | 2021-01-29 | 2021-05-14 | 上海瞻芯电子科技有限公司 | Fixed feedforward control method for power factor correction circuit |
| CN113544962A (en) * | 2019-03-08 | 2021-10-22 | 三菱电机株式会社 | DC power supply device, power conversion device, and refrigeration cycle device |
| CN113647003A (en) * | 2019-03-29 | 2021-11-12 | 株式会社村田制作所 | Self-tuning regulator and self-tuning regulation method for interleaved power factor correction circuit |
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| CN104135002A (en) * | 2014-07-11 | 2014-11-05 | 邯郸美的制冷设备有限公司 | Staggered power factor corrector |
| WO2016004700A1 (en) * | 2014-07-11 | 2016-01-14 | 美的集团股份有限公司 | Staggered power factor corrector |
| US10141848B2 (en) | 2014-07-11 | 2018-11-27 | Midea Group Co., Ltd. | Interleaved power factor corrector |
| WO2016011968A1 (en) * | 2014-07-23 | 2016-01-28 | 珠海格力电器股份有限公司 | Two-way-interlaced pfc current balancing circuit and air conditioner |
| CN104113202A (en) * | 2014-07-23 | 2014-10-22 | 珠海格力电器股份有限公司 | Two-way staggered PFC current balance circuit and air conditioner |
| CN106160451A (en) * | 2016-08-01 | 2016-11-23 | 上海交通大学 | Three close-loop control power factor corrector and control method, supporting wireless charging circuit |
| CN106533196B (en) * | 2016-12-16 | 2019-04-30 | 上海三菱电机·上菱空调机电器有限公司 | Frequency changer circuit and its deviation suppressing method with the full PAM control mode of interleaving mode |
| CN106533196A (en) * | 2016-12-16 | 2017-03-22 | 上海三菱电机·上菱空调机电器有限公司 | Frequency conversion circuit with interlaced mode full PAM control mode and deviation inhibition method thereof |
| CN106787795A (en) * | 2016-12-16 | 2017-05-31 | 上海三菱电机·上菱空调机电器有限公司 | The method that a kind of frequency changer circuit and its deviation with interleaving mode suppress |
| CN108173427A (en) * | 2017-12-14 | 2018-06-15 | 珠海格力电器股份有限公司 | Control method and device of power factor correction circuit, storage medium and electric appliance |
| CN108254675A (en) * | 2018-03-14 | 2018-07-06 | 奥克斯空调股份有限公司 | Pfc circuit failure detector, method and convertible frequency air-conditioner |
| CN109039135A (en) * | 2018-08-31 | 2018-12-18 | 长沙威克电力技术科技有限公司 | It is declined the sliding formwork current-sharing control method of inverter based on interleaving inverse excitation |
| CN113544962A (en) * | 2019-03-08 | 2021-10-22 | 三菱电机株式会社 | DC power supply device, power conversion device, and refrigeration cycle device |
| CN113647003A (en) * | 2019-03-29 | 2021-11-12 | 株式会社村田制作所 | Self-tuning regulator and self-tuning regulation method for interleaved power factor correction circuit |
| CN110071628A (en) * | 2019-05-24 | 2019-07-30 | 珠海格力电器股份有限公司 | Interleaved PFC current control method, control circuit and variable frequency air conditioner |
| CN111835192A (en) * | 2020-07-15 | 2020-10-27 | 苏州浪潮智能科技有限公司 | PFC zero crossing point DC bias optimization control method, device, equipment and medium |
| CN112803748A (en) * | 2021-01-29 | 2021-05-14 | 上海瞻芯电子科技有限公司 | Fixed feedforward control method for power factor correction circuit |
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