CN109494973A - PFC control method, device, pfc circuit and motor-drive circuit - Google Patents

PFC control method, device, pfc circuit and motor-drive circuit Download PDF

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Publication number
CN109494973A
CN109494973A CN201811574920.9A CN201811574920A CN109494973A CN 109494973 A CN109494973 A CN 109494973A CN 201811574920 A CN201811574920 A CN 201811574920A CN 109494973 A CN109494973 A CN 109494973A
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China
Prior art keywords
current
input
pfc circuit
pfc
circuit
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CN109494973B (en
Inventor
王甫敬
盛爽
夏瑞
郑长春
黄勇
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Guangdong Hi Tower Frequency Conversion Technology Co Ltd
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Guangdong Hi Tower Frequency Conversion Technology Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/42Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208Arrangements for improving power factor of AC input
    • H02M1/4225Arrangements for improving power factor of AC input using a non-isolated boost converter
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H02P27/085Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies 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

Abstract

The present invention relates to PFC control fields, disclose a kind of pfc circuit control method, device, circuit and motor-drive circuit, by the input voltage average value for determining pfc circuit according to busbar voltage, bus current and input average current, and step-up ratio coefficient is determined according to busbar voltage and input voltage average value, then step-up ratio coefficient, input average current and input current determine the duty ratio D of the switching tube of driving pfc circuit, to control pfc circuit work.The step-up ratio coefficient calculated according to average voltage can be enabled timely to follow busbar voltage and change with input current, guarantee the reasonable setting of the step-up ratio coefficient under ultralow pressure environment, finally the switching tube of control pfc circuit is gone to work according to the duty ratio that step-up ratio coefficient determines with this, obtain a reasonable busbar voltage, to guarantee that motor-drive circuit is in suitable state, guarantee the device unlikely damage safely in circuit.

Description

PFC control method, device, pfc circuit and motor-drive circuit
Technical field
The present invention relates to PFC control fields, and in particular to a kind of pfc circuit control method, device, pfc circuit and motor Driving circuit.
Background technique
Active PFC (Power Factor Correction, PFC) circuit is empty in such as frequency conversion of current frequency-conversion domestic electric appliances It is widely used in the household appliances such as tune, refrigerator or washing machine, at present when designing pfc circuit, is generally just for supply voltage 160V-220V range designs the range of the range of DC bus-bar voltage and the step-up ratio coefficient of pfc controller.And in region electricity In net, especially rural power grids, power grid load capacity is poor, and voltage decline is severe when loading big, such as uses in summer air-conditioning more The supply voltage of period power grid be seriously pulled down to 140V or so so that pfc circuit can not work at this moment to be caused Frequency-conversion domestic electric appliances are shut down because of undertension.
Summary of the invention
The object of the present invention is to provide a kind of pfc circuit control method, device, pfc circuit and motor-drive circuit, purposes It is that solve existing pfc circuit causes corresponding frequency-conversion domestic electric appliances can not be in this voltage due to not adapting to ultra low voltage environment It works and halting problem under environment.
To achieve the goals above, the present invention provides a kind of pfc circuit control method, and pfc circuit is applied to motor driven Circuit, motor-drive circuit include rectification circuit, controller and inverter, which is characterized in that control method includes:
The input current of pfc circuit is obtained, and determines the input average current of pfc circuit according to input current;
The bus current of pfc circuit output is obtained, obtains the busbar voltage of PFC electric current output, and according to busbar voltage, mother Line current and input average current determine the input voltage average value of pfc circuit;
Step-up ratio coefficient is determined according to busbar voltage and input voltage average value;
The duty ratio of the switching tube of driving pfc circuit is determined according to step-up ratio coefficient, input average current and input current;
Switch motion is carried out according to duty ratio control switch pipe to control pfc circuit work.
Optionally, step-up ratio coefficient range is pi/2 to π.
Optionally, above-mentioned control method further include:
The filter value of bus current is determined according to bus current;
Determine that the input voltage of pfc circuit is average according to busbar voltage, the filter value of bus current and input average current Value.
Optionally, the input average current for determining pfc circuit according to input current includes:
The last one PFC in the current period for the input current that the current PFC control period is in place controls the period In the case where, calculate the average current in the period of present input current;
The last one PFC control week in the current period of input current where being not in the current PFC control period In the case where phase, the average current of the previous cycle of input current is obtained.
To achieve the goals above, the present invention also provides a kind of pfc circuit control device, motor-drive circuit includes rectification Circuit, controller and inverter, which is characterized in that pfc circuit control device includes:
Input current sampling module, for acquiring the input current of pfc circuit;
Voltage sample module, for acquiring the busbar voltage of pfc circuit output;
Current sampling module is exported, for acquiring the output electric current of pfc circuit;
Controller is configured to: the input current of pfc circuit is obtained from input current sampling module, and according to input current The input average current for determining pfc circuit obtains the output electric current of PFC circuit from output current sampling module, from voltage sample Module obtains the busbar voltage of pfc circuit output, and determines PFC electricity according to busbar voltage, bus current and input average current The input voltage average value on road determines step-up ratio coefficient according to busbar voltage and input voltage average value, according to step-up ratio coefficient, Input the duty ratio that average current and input current determine the switching tube of driving pfc circuit, according to duty ratio control switch pipe into Row switch motion is to control pfc circuit work.
Optionally, step-up ratio coefficient range is pi/2 to π.
Optionally, controller is further configured to:
The filter value of bus current is determined according to bus current;
Determine that the input voltage of pfc circuit is average according to busbar voltage, the filter value of bus current and input average current Value.
Optionally, controller is configured to determine that the input average current of pfc circuit includes: according to input current
The last one PFC in the current period for the input current that the current PFC control period is in place controls the period In the case where, calculate the average current in the period of present input current;
The last one PFC control week in the current period of input current where being not in the current PFC control period In the case where phase, the average current of the previous cycle of input current is obtained.
To achieve the goals above, the present invention also provides a kind of pfc circuit, pfc circuit include inductance, switching tube and quickly Recovery diode, which is characterized in that pfc circuit further includes the pfc circuit control device such as any one of claim 5-8;
One end of inductance is the input anode of pfc circuit, the other end of inductance and the input terminal of switching tube and quickly The anode of recovery diode connects altogether, and the cathode of fast recovery diode is the output head anode of pfc circuit, the output end of switching tube The negative pole of output end of pfc circuit is connected, the control terminal of switching tube is the control terminal of pfc circuit.
Through the above technical solutions, motor-drive circuit includes rectification mould the present invention also provides a kind of motor-drive circuit Block, filter module, which is characterized in that motor-drive circuit further includes the pfc circuit of claim 9;
Rectification module output end connects the input terminal of pfc circuit, and rectification module is used for being input to motor-drive circuit Alternating current carries out rectification output ripple direct current;
Filter module connects the output end of pfc circuit, and for being filtered to the direct current that pfc circuit exports, output is flat Sliding direct current, filter module connects DC bus, and is powered by DC bus for motor-drive circuit.
Through the above technical solutions, pfc circuit control method of the invention, by obtaining the input current of pfc circuit, and The input average current of pfc circuit is determined according to input current, and obtains the bus current of PFC circuit output, obtains PFC electricity The busbar voltage of circuit output, and the input voltage of pfc circuit is determined according to busbar voltage, bus current and input average current Average value, and step-up ratio coefficient is determined according to busbar voltage and input voltage average value, according to step-up ratio coefficient, the average electricity of input Stream and input current determine the duty ratio D of the switching tube of driving pfc circuit, are finally opened according to duty ratio D control switch pipe Pass movement is to control pfc circuit work.Busbar voltage, mother when due to calculating input voltage average value with PFC circuit output side Line current is related to the input average current of the input side of pfc circuit, so that the liter finally calculated according to average voltage Pressure ratio coefficient can timely follow busbar voltage and change with input current, can guarantee the step-up ratio coefficient under ultralow pressure environment Rationally setting finally goes the switching tube of control pfc circuit to work, obtains one with this according to the duty ratio that step-up ratio coefficient determines Reasonable busbar voltage.To guarantee that motor-drive circuit be in suitable state, device in guarantee circuit unlikely damage safely It is bad.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the circuit diagram of the motor-drive circuit of the pfc circuit control method of the embodiment of the present invention;
Fig. 2 is the flow chart of the pfc circuit control method of the embodiment of the present invention;
Fig. 3 is input current, the waveform diagram for controlling period and average current;
Fig. 4 is input current, input current amplitude and the waveform diagram for inputting average current;
Fig. 5 is the variation relation schematic diagram of duty ratio Yu step-up ratio coefficient.
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
It is to be appreciated that if relating to directionality instruction (such as up, down, left, right, before and after ...) in the embodiment of the present invention, Then directionality instruction is only used for explaining and close in the relative position under a certain particular pose (as shown in the picture) between each component System, motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, being somebody's turn to do " first ", " second " etc. if relating to the description of " first ", " second " etc. in the embodiment of the present invention Description be used for description purposes only, be not understood to indicate or imply its relative importance or implicitly indicate indicated skill The quantity of art feature." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one spy Sign.It in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution Conjunction is not present, also not the present invention claims protection scope within.
The embodiment of the present invention proposes pfc circuit control method, which is used for motor-drive circuit, which is Permanent magnet synchronous motor, motor-drive circuit simplified electrical circuit diagram as shown in Figure 1, the motor-drive circuit include rectification module 60, PFC Module 50, filter module 70, controller 10, inverter 80, voltage sample module 30, input current sampling module 20 and output Current sampling module 40, wherein by the AC rectification of input at Rectified alternating current, which can be in figure rectification module 60 Bridge rectifier;The Rectified alternating current that PFC module 50 is used to export rectification module 60 carries out Active PFC, filtering The direct current that module 70 exports PFC module 50 is filtered, and is converted into smooth direct current, and the filter module 70 is mainly by great Rong The electrolytic capacitor (such as 400uF/450V) of amount, and inverter 80 is powered by connecting DC bus;Voltage sample module 30 are output to controller 10 for acquiring above-mentioned DC bus-bar voltage Vdc, and input current sampling module 20 is mainly by single resistance R1 Composition is series in rectification module 60 and the power circuit of PFC module 50, is entered for acquiring from the output of rectification module 60 The input current Ibd of PFC module 50, and export the series connection of current sampling module 40 and be mainly made of single resistance R2, it is series at direct current During bus is returned, for acquiring bus current Idc, controller 10 is used to generate the switching tube IGBT work of control PFC module 50 Pwm signal, with control PFC module 50 work;By calculating generation, this is inverse also according to bus current Idc for controller 10 simultaneously Become the three-phase current of the three-phase windings of 80 driving motor 90 of device, controller 10 is according to above-mentioned DC bus-bar voltage Vdc and three-phase Electric current carries out vector controlled, ultimately generates the PWM signal of six way switch pipes of driving inverter 80, to control the drive of inverter 80 Dynamic motor 90 is run.
As shown in Fig. 2, the controllable method based on single resistance sampling based on above-mentioned motor-drive circuit includes:
Step S210, the input current Ibd of pfc circuit is obtained, and determines the input of pfc circuit according to input current Ibd Average current Ibd_ave;
Step S220, the bus current Idc of pfc circuit output is obtained, the busbar voltage Vdc of pfc circuit output is obtained, and The input voltage average value of pfc circuit is determined according to busbar voltage Vdc, bus current Idc and input average current Ibd_ave Vbd_ave;
Step S230, busbar voltage given value Vdc_ref is obtained, and according to busbar voltage given value Vdc_ref and input Average voltage Vbd_ave determines step-up ratio COEFFICIENT K a;
Step S240, driving is determined according to step-up ratio COEFFICIENT K a, input average current Ibd_ave and input current Ibd The duty ratio D of the switching tube of pfc circuit;
Step S250, switch motion is carried out according to duty ratio D control switch pipe to control pfc circuit work.
In step S210, input current Ibd is acquired by input current sampling module 20, which is rectifier bridge stack 60 Output electric current, here by taking k-th controls the period to the PWM of IGBT pipe as an example, the average current in an input current cycle T Ibd_ave are as follows:
Wherein Ts is that PWM controls period, unit material calculation, and T is the period of input current Ibd, and N is input current week Phase number, input current Ibd and control cycle T s, average current Ibd_ave waveform diagram as shown in figure 3, the input is electric Flowing Ibd is the electric current that rectification module 60 exports, and be can be seen that from Fig. 3, and the period is the half in extraneous input AC period, such as By taking 220V/50Hz alternating current as an example, T is 10ms at this time.In conjunction with above-mentioned formula it is found that each input current cycle T updates once Average current Ibd_ave, for being currently the n-th input current period, if current control cycle T s is current input The last one material calculation in the period of electric current Ibd then can directly calculate the average current Ibd_ave in current period (N), the average current Ibd_ave (N-1), the average current Ibd_ in n-th period of previously input current cycle are otherwise used Ave calculation formula are as follows:
Wherein n=T/Ts
In step S220, bus current Idc is obtained by output current sampling module 40, and pass through voltage sample module 30 obtain DC bus-bar voltage Vdc, and the approximately equal principle of power that outputs and inputs of pfc circuit calculates input voltage average value Vbd_ave, specific formula are as follows:
Wherein K is that current PWM controls periodicity.
Further, can also first-order filtering be carried out to bus current Idc obtain the filter value Idc_fil of bus current Idc, Avoiding interference signal from influencing acquisition bus current Idc with this causes collection value inaccurate, and calculation formula is as follows:
Idc_fil(k)=(ωcTs)Idc(k-1)+(1-ωcTs)Idc_fil(k-1)
Wherein ωcFor cutoff frequency parameter, Ts is that PWM controls the period.
Input voltage is calculated in above-mentioned formula using the filter value Idc_fil substitution bus current Idc of bus current Idc Average value Vbd_ave, so that the value calculates the fluctuation of the calculated result according to caused by accurately avoiding interference signal.
In step S230, busbar voltage given value Vdc_ref is the bus voltage value of setting, when motor-drive circuit is transported When row is under low supply voltage environment, busbar voltage given value Vdc_ref need to such as work as between Vdc_min and Vdc_max When the alternating voltage virtual value of external world's input is 220V, Vdc_min=200V, Vdc_max=400V.Further, for air-conditioning The household electrical appliance such as device, refrigerator, electric moter voltage rated value are 200-220V, it is assumed that frequency-variable controller operates in always linear modulation Region, then for the motor of 220V, 80 side of inverter needs busbar voltage to be loaded are as follows:
Therefore it is directed to the input voltage of 220V, busbar voltage given value Vdc_ref can be set as 311V, wherein Vac_ Rms is alternating voltage virtual value.
The step-up ratio system of current PWM control period k is determined according to busbar voltage Vdc and input voltage average value Vbd_ave Count Ka according to the following formula:
In step S240, is determined and driven according to step-up ratio COEFFICIENT K a, input average current Ibd_ave and input current Ibd The duty ratio D of the switching tube of dynamic pfc circuit is according to existing PFC monocycle algorithm calculation formula:
Last PFC control unit 11 exports corresponding pwm control signal according to above-mentioned duty ratio with control switch pipe IGBT work Make, the control for carrying out Active PFC to pfc circuit is realized with this.
The pfc circuit control method of the embodiment of the present invention, obtains the input current of pfc circuit, and true according to input current Determine the input average current of pfc circuit, and obtain the bus current of pfc circuit output, obtains the bus electricity of PFC electricity circuit output It presses, and determines the input voltage average value of pfc circuit according to busbar voltage, bus current and input average current, and according to mother Line voltage and input voltage average value determine step-up ratio coefficient, true according to step-up ratio coefficient, input average current and input current Surely the duty ratio D of the switching tube of PFC circuit is driven, switch motion is finally carried out to control according to duty ratio D control switch pipe Pfc circuit work.It is electric with the busbar voltage of pfc circuit outlet side, bus current and PFC when due to calculating input voltage average value The input average current of the input side on road is related, so that finally can be in time according to the step-up ratio coefficient that average voltage calculates Follow busbar voltage and with input current change, can guarantee the reasonable setting of the step-up ratio coefficient under ultralow pressure environment, finally It goes the switching tube of control pfc circuit to work according to the duty ratio that step-up ratio coefficient determines with this, obtains a reasonable bus electricity Pressure.To guarantee that motor-drive circuit is in suitable state, guarantee the device unlikely damage safely in circuit.
Further, it is above-mentioned step-up ratio COEFFICIENT K a (k) is calculated after, also further to its range carry out limitation repair Just.
According to the calculation formula of duty ratio D:
The wherein calculating formula of input current Ibd and input current amplitude Ibd_mag are as follows:
Ibd=Ibd_mag| sin θ |,
Then average value Ibd_ave in the period of an input current are as follows:
Wherein the waveform relationship of Ibd, Ibd_mag and Ibd_ave are as shown in figure 4, by the calculation formula of Ibd and Ibd_ave Substituting into above-mentioned duty ratio D calculation formula can obtain:
The relationship of duty ratio D and step-up ratio COEFFICIENT K a can be obtained with this as shown in figure 5, as shown in Figure 5, when Ka < pi/2, accounting for There is the case where less than 0 in sky ratio D, this is that practical control does not allow, so D is limited in 0, at this moment switching tube IGBT occurs The region being not turned on, it is meant that ac-side current is uncontrollable, will lead to current distortion and spike occurs, while power factor is much small In 1 the case where, so Ka need to be greater than or equal to pi/2.
As Ka > π, duty ratio D curve is all more than 0.5 numerical value, i.e. PFC device for power switching IGBT turn-on instant It is always larger than the shutdown moment, at this moment ac-side current harmonic wave is larger, and in addition the IGBT break-over of device time is longer, and fever is serious, institute π need to be less than with Ka.
Thus above-mentioned step-up ratio COEFFICIENT K a value range is pi/2~π.
Further, when above-mentioned step-up ratio COEFFICIENT K a is beyond between above-mentioned value range pi/2~π i.e. 1.57~3.14, It needs to correct busbar voltage given value Vdc_ref according to the step-up ratio COEFFICIENT K a after limitation, so that the liter finally calculated Pressure ratio COEFFICIENT K a is within the above range.
Such as in each middle voltage effective value of external world's input, if being with busbar voltage given value Vdc_ref When 350V, each step-up ratio coefficient and actual busbar voltage given value Vdc_ref actually obtained is as follows:
Wherein the calculated value of secondary series dimension step-up ratio COEFFICIENT K a, third are classified as step-up ratio COEFFICIENT K a actual setpoint, and the 4th It is classified as actual busbar voltage setting value Vdc_ref, it can be seen that in the first row when external voltage is higher, step-up ratio COEFFICIENT K a Calculated value have been over minimum i.e. 1.57 of above-mentioned value range, therefore force to be limited to minimum value 1.57, be needed with this Corresponding busbar voltage setting value Vdc_ref is turned up, so that the step-up ratio COEFFICIENT K a finally calculated meets above-mentioned model Enclose requirement.Similarly in the third line from the bottom to row last, the calculated value of step-up ratio COEFFICIENT K a has been over above-mentioned value model The peak enclosed i.e. 3.14, therefore force to be limited to peak 3.14, it is needed with this by corresponding busbar voltage setting value Vdc_ Ref is turned down, so that the step-up ratio COEFFICIENT K a finally calculated meets the above range requirement.
The embodiment of the present invention also proposes that a kind of pfc circuit control device, the pfc circuit are used for motor-drive circuit, such as Motor-drive circuit simplified electrical circuit diagram shown in Fig. 1, the motor-drive circuit include rectification module 60, PFC module 50, filter module 70, controller 10 and inverter 80, wherein for rectification module 60 by the AC rectification of input at Rectified alternating current, which can be with It is the bridge rectifier in figure;The Rectified alternating current that PFC module 50 is used to export rectification module 60 carries out power factor (PF) school Just, the direct current that filter module 70 exports PFC module 50 is filtered, and is converted into smooth direct current, and the filter module 70 is main Inverter 80 is powered by the electrolytic capacitor (such as 400uF/450V) of large capacity, and by connecting DC bus.The PFC Circuit control device includes:
Input current sampling module 20, for acquiring the input current of pfc circuit;
Voltage sample module 30, for acquiring the busbar voltage of pfc circuit output;
Current sampling module 40 is exported, for acquiring the output electric current of pfc circuit;
Controller 10 is configured to: the input current of pfc circuit is obtained from input current sampling module 20, and according to input Electric current determines the input average current of pfc circuit, the output electric current of pfc circuit is obtained from output current sampling module 40, from electricity Sampling module 30 is pressed to obtain the busbar voltage of pfc circuit output, and flat according to busbar voltage, the filter value of bus current and input Equal electric current determines the input voltage average value of pfc circuit, determines step-up ratio coefficient according to busbar voltage and input voltage average value, The duty ratio that the switching tube of driving pfc circuit is determined according to step-up ratio coefficient, input average current and input current, according to duty Switch motion is carried out than control switch pipe to control pfc circuit work.
Input current Ibd is acquired by input current sampling module 20, which is the output electric current of rectifier bridge stack 60, this In by taking k-th controls the period to the PWM of IGBT pipe as an example, the average current Ibd_ave in an input current cycle T are as follows:
Wherein Ts is that PWM controls period, unit material calculation, and T is the period of input current Ibd, and N is input current week Phase number, input current Ibd and control cycle T s, average current Ibd_ave waveform diagram as shown in figure 3, the input is electric Flowing Ibd is the electric current that rectification module 60 exports, and be can be seen that from Fig. 3, and the period is the half in extraneous input AC period, such as By taking 220V/50Hz alternating current as an example, T is 10ms at this time.In conjunction with above-mentioned formula it is found that each input current cycle T updates once Average current Ibd_ave, for being currently the n-th input current period, if current control cycle T s is current input The last one material calculation in the period of electric current Ibd then can directly calculate the average current Ibd_ave in current period (N), the average current Ibd_ave (N-1), the average current Ibd_ in n-th period of previously input current cycle are otherwise used Ave calculation formula are as follows:
Wherein n=T/Ts
Then bus current Idc is obtained by output current sampling module 40, and is obtained directly by voltage sample module 30 Busbar voltage Vdc is flowed, the approximately equal principle of power that outputs and inputs of pfc circuit calculates input voltage average value Vbd_ave, Specific formula are as follows:
Wherein K is that current PWM controls periodicity.
Further, can also first-order filtering be carried out to bus current Idc obtain the filter value Idc_fil of bus current Idc, Avoiding interference signal from influencing acquisition bus current Idc with this causes collection value inaccurate, and calculation formula is as follows:
Idc_fil(k)=(ωcTs)Idc(k-1)+(1-ωcTs)Idc_fil(k-1)
Wherein ωcFor cutoff frequency parameter, Ts is that PWM controls the period.
Input voltage is calculated in above-mentioned formula using the filter value Idc_fil substitution bus current Idc of bus current Idc Average value Vbd_ave, so that the value calculates the fluctuation of the calculated result according to caused by accurately avoiding interference signal.
Busbar voltage given value Vdc_ref is the bus voltage value of setting, when motor-drive circuit runs on low power supply electricity When under pressure ring border, busbar voltage given value Vdc_ref need to be between Vdc_min and Vdc_max, such as when the extraneous friendship inputted When stream voltage effective value is 220V, Vdc_min=200V, Vdc_max=400V.Further, for families such as air conditioner, refrigerators Electrical appliance, electric moter voltage rated value be 200-220V, it is assumed that frequency-variable controller operates in always linear modulation region, then for The motor of 220V, 80 side of inverter need busbar voltage to be loaded are as follows:
Therefore it is directed to the input voltage of 220V, busbar voltage given value Vdc_ref can be set as 311V, wherein Vac_ Rms is alternating voltage virtual value.
The step-up ratio system of current PWM control period k is determined according to busbar voltage Vdc and input voltage average value Vbd_ave Count Ka according to the following formula:
Opening for driving pfc circuit is determined according to step-up ratio COEFFICIENT K a, input average current Ibd_ave and input current Ibd The duty ratio D of pipe is closed according to existing PFC monocycle algorithm calculation formula:
Last PFC control unit 11 exports corresponding pwm control signal according to above-mentioned duty ratio with control switch pipe IGBT work Make, the control for carrying out Active PFC to pfc circuit is realized with this.
The pfc circuit control device of the embodiment of the present invention obtains the defeated of PFC circuit by input current sampling module 20 Enter electric current, and determine the input average current of pfc circuit according to input current, and is obtained by output current sampling module 40 The bus current of pfc circuit output, the busbar voltage of pfc circuit output is obtained by voltage sample module 30, and according to bus Voltage, bus current and input average current determine the input voltage average value of pfc circuit, and according to busbar voltage and input electricity It flattens mean value and determines step-up ratio coefficient, driving pfc circuit is determined according to step-up ratio coefficient, input average current and input current The duty ratio D of switching tube finally carries out switch motion according to duty ratio D control switch pipe to control the work of PFC circuit.Due to Input when calculating input voltage average value with the input side of the busbar voltage of pfc circuit outlet side, bus current and pfc circuit Average current is related so that finally according to the step-up ratio coefficient that average voltage calculates can timely follow busbar voltage and Change with input current, can guarantee the reasonable setting of the step-up ratio coefficient under ultralow pressure environment, finally with this according to step-up ratio system The determining duty ratio of number goes the switching tube work of control pfc circuit, obtains a reasonable busbar voltage.To guarantee that motor drives Dynamic circuit is in suitable state, guarantees the device unlikely damage safely in circuit.
Further, it is above-mentioned step-up ratio COEFFICIENT K a (k) is calculated after, also further to its range carry out limitation repair Just.
According to the calculation formula of duty ratio D:
The wherein calculating formula of input current Ibd and input current amplitude Ibd_mag are as follows:
Ibd=Ibd_mag| sin θ |,
Then average value Ibd_ave in the period of an input current are as follows:
Wherein the waveform relationship of Ibd, Ibd_mag and Ibd_ave are as shown in figure 4, by the calculation formula of Ibd and Ibd_ave Substituting into above-mentioned duty ratio D calculation formula can obtain:
The relationship of duty ratio D and step-up ratio COEFFICIENT K a can be obtained with this as shown in figure 5, as shown in Figure 5, when Ka < pi/2, accounting for There is the case where less than 0 in sky ratio D, this is that practical control does not allow, so D is limited in 0, at this moment switching tube IGBT occurs The region being not turned on, it is meant that ac-side current is uncontrollable, will lead to current distortion and spike occurs, while power factor is much small In 1 the case where, so Ka need to be greater than or equal to pi/2.
As Ka > π, duty ratio D curve is all more than 0.5 numerical value, i.e. PFC device for power switching IGBT turn-on instant It is always larger than the shutdown moment, at this moment ac-side current harmonic wave is larger, and in addition the IGBT break-over of device time is longer, and fever is serious, institute π need to be less than with Ka.
Thus above-mentioned step-up ratio COEFFICIENT K a value range is pi/2~π.
Further, when above-mentioned step-up ratio COEFFICIENT K a is beyond between above-mentioned value range pi/2~π i.e. 1.57~3.14, It needs to correct busbar voltage given value Vdc_ref according to the step-up ratio COEFFICIENT K a after limitation, so that the liter finally calculated Pressure ratio COEFFICIENT K a is within the above range.
Such as in each middle voltage effective value of external world's input, if being with busbar voltage given value Vdc_ref When 350V, each step-up ratio coefficient and actual busbar voltage given value Vdc_ref actually obtained is as follows:
Wherein the calculated value of secondary series dimension step-up ratio COEFFICIENT K a, third are classified as step-up ratio COEFFICIENT K a actual setpoint, and the 4th It is classified as actual busbar voltage setting value Vdc_ref, it can be seen that in the first row when external voltage is higher, step-up ratio COEFFICIENT K a Calculated value have been over minimum i.e. 1.57 of above-mentioned value range, therefore force to be limited to minimum value 1.57, be needed with this Corresponding busbar voltage setting value Vdc_ref is turned up, so that the step-up ratio COEFFICIENT K a finally calculated meets above-mentioned model Enclose requirement.Similarly in the third line from the bottom to row last, the calculated value of step-up ratio COEFFICIENT K a has been over above-mentioned value model The peak enclosed i.e. 3.14, therefore force to be limited to peak 3.14, it is needed with this by corresponding busbar voltage setting value Vdc_ Ref is turned down, so that the step-up ratio COEFFICIENT K a finally calculated meets the above range requirement.
The embodiment of the present invention also proposes a kind of pfc circuit and the motor-drive circuit applied to the pfc circuit, such as Fig. 1 institute Show, it further includes above-mentioned pfc circuit control which, which includes inductance L, switching tube IGBT and fast recovery diode FRD, Device.In Fig. 1, one end of inductance L is the input anode of PFC circuit, and the other end of inductance L and switching tube IGBT's is defeated Enter the i.e. anode of the pole C and fast recovery diode FRD in end to connect altogether, the cathode of fast recovery diode FRD is the defeated of pfc circuit Outlet, the output end, that is, pole E connection PFC electric current input and output side of switching tube IGBT, control terminal, that is, pole G of switching tube IGBT For the control terminal of pfc circuit.The motor-drive circuit includes rectification module 60, filter module 70, inverter 80 and above-mentioned PFC Circuit, the motor-drive circuit can be applicable to through the household appliances of the loaded work pieces such as permanent magnet synchronous motor, frequency-changeable compressor such as On convertible frequency air-conditioner, frequency conversion refrigerator or variable-frequency washing machine.
The pfc circuit realizes the trouble free service under low voltage environment, and exporting reasonable busbar voltage is subsequent inversion Device 80 is powered, so that inverter 80 can still be worked under low voltage environment with driving motor 90, motor 90 is made to be in one Suitable working condition remains to effective fan-out capability, so that the household appliances such as air conditioner using the motor-drive circuit exists It remains to export effective refrigerating/heating ability under low voltage environment.
The embodiments of the present invention also provide computer program products, including program instruction, and the program instruction is by controller Enable the controller to realize the arbitrary motor drive control method for single resistance sampling in above-described embodiment when execution.
The embodiments of the present invention also provide storage mediums, are stored thereon with computer-readable instruction, this is computer-readable Instruction enables the controller to execute the arbitrary motor for single resistance sampling in above-described embodiment when being executed by a controller Drive control method.
It will be appreciated by those skilled in the art that realizing that all or part of the steps in above embodiment method is can to lead to Program is crossed to instruct relevant hardware and complete, which is stored in a storage medium, including some instructions use so that One (can be single-chip microcontroller, chip etc.) or processor (processor) execute each embodiment the method for the application All or part of the steps.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can store journey The medium of sequence code.
In the description of this specification, the description meaning of reference term " first embodiment ", " second embodiment ", " example " etc. Refer to specific method, device or feature described in conjunction with this embodiment or example be contained at least one embodiment of the present invention or In example.In the present specification, the schematic representation of the above terms does not necessarily have to refer to the same embodiment or example.And And specific features, method, apparatus or the feature of description can be in any one or more of the embodiments or examples with suitable sides Formula combines.In addition, without conflicting with each other, those skilled in the art can will be described in this specification different real The feature for applying example or example and different embodiments or examples is combined.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills Art field, is included within the scope of the present invention.

Claims (10)

1. a kind of control method for Active PFC pfc circuit, the pfc circuit is applied to motor-drive circuit, institute Stating motor-drive circuit includes rectification circuit, controller and inverter, which is characterized in that the control method includes:
The input current of the pfc circuit is obtained, and determines the input average current of pfc circuit according to the input current;
The bus current for obtaining the pfc circuit output obtains the busbar voltage of the PFC electric current output, and according to the mother Line voltage, the bus current and the input average current determine the input voltage average value of the pfc circuit;
Step-up ratio coefficient is determined according to the busbar voltage and the input voltage average value;
It is determined according to the step-up ratio coefficient, the input average current and the input current and drives opening for the pfc circuit Close the duty ratio of pipe;
The switching tube, which is controlled, according to the duty ratio carries out switch motion to control the pfc circuit work.
2. control method as described in claim 1, which is characterized in that the step-up ratio coefficient range is pi/2 to π.
3. control method as described in claim 1, which is characterized in that further include:
The filter value of the bus current is determined according to the bus current;
The pfc circuit is determined according to the busbar voltage, the filter value of the bus current and the input average current Input voltage average value.
4. control method as described in claim 1, which is characterized in that determine the input of pfc circuit according to the input current Average current includes:
The feelings in the last one PFC control period in the current period for the input current that the current PFC control period is in place Under condition, the average current in the period of present input current is calculated;
The last one PFC in the current period of input current where being not in the current PFC control period controls the period In the case of, obtain the average current of the previous cycle of the input current.
5. a kind of pfc circuit control device, the pfc circuit is applied to motor-drive circuit, and the motor-drive circuit includes Rectification circuit, controller and inverter, which is characterized in that the pfc circuit control device includes:
Input current sampling module, for acquiring the input current of the pfc circuit;
Voltage sample module, for acquiring the busbar voltage of the pfc circuit output;
Current sampling module is exported, for acquiring the output electric current of the pfc circuit;
The controller is configured to:
The input current of the pfc circuit is obtained from the input current sampling module, and PFC is determined according to the input current The input average current of circuit;
The output electric current that the pfc circuit is obtained from the output current sampling module, obtains institute from the voltage sample module The busbar voltage of pfc circuit output is stated, and is determined according to the busbar voltage, the bus current and the input average current The input voltage average value of the pfc circuit;
Step-up ratio coefficient is determined according to the busbar voltage and the input voltage average value;
It is determined according to the step-up ratio coefficient, the input average current and the input current and drives opening for the pfc circuit Close the duty ratio of pipe;
The switching tube, which is controlled, according to the duty ratio carries out switch motion to control the pfc circuit work.
6. pfc circuit control device as claimed in claim 5, which is characterized in that the step-up ratio coefficient range is pi/2 to π.
7. pfc circuit control device as claimed in claim 5, which is characterized in that the controller is further configured to:
The filter value of the bus current is determined according to the bus current;
The pfc circuit is determined according to the busbar voltage, the filter value of the bus current and the input average current Input voltage average value.
8. pfc circuit control device as claimed in claim 5, which is characterized in that the controller is configured to according to Input current determines that the input average current of pfc circuit includes:
The feelings in the last one PFC control period in the current period for the input current that the current PFC control period is in place Under condition, the average current in the period of present input current is calculated;
The last one PFC in the current period of input current where being not in the current PFC control period controls the period In the case of, obtain the average current of the previous cycle of the input current.
9. a kind of pfc circuit, the pfc circuit includes inductance, switching tube and fast recovery diode, which is characterized in that described Pfc circuit further includes such as the described in any item pfc circuit control devices of claim 5-8;
One end of the inductance is the input anode of the pfc circuit, the other end of the inductance and the switching tube it is defeated The anode for entering end and the fast recovery diode connects altogether, and the cathode of the fast recovery diode is the pfc circuit Output head anode, the output end of the switching tube connect the negative pole of output end of the pfc circuit, and the control terminal of the switching tube is The control terminal of the pfc circuit.
10. a kind of motor-drive circuit, the motor-drive circuit includes rectification module, filter module, which is characterized in that described Motor-drive circuit further includes pfc circuit as claimed in claim 9;
The rectification module output end connects the input terminal of the pfc circuit, and the rectification module is used for being input to the electricity The alternating current of drive circuit carries out rectification output ripple direct current;
The filter module connects the output end of the pfc circuit, and the direct current for exporting to the pfc circuit is filtered Wave, output smoothing direct current, the filter module connect DC bus, and are the motor driven electricity by the DC bus Road is powered.
CN201811574920.9A 2018-12-21 2018-12-21 PFC control method and device, PFC circuit and motor drive circuit Active CN109494973B (en)

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CN113452251A (en) * 2021-06-17 2021-09-28 珠海格力电器股份有限公司 Buck-boost control method, function relation building method, processor and driving circuit

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