CN111600476B - PFC circuit control signal adjusting system and method - Google Patents
PFC circuit control signal adjusting system and method Download PDFInfo
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- CN111600476B CN111600476B CN202010513858.3A CN202010513858A CN111600476B CN 111600476 B CN111600476 B CN 111600476B CN 202010513858 A CN202010513858 A CN 202010513858A CN 111600476 B CN111600476 B CN 111600476B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 27
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 5
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 230000003750 conditioning effect Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
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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
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
- H02M1/0022—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters the disturbance parameters being input voltage fluctuations
-
- 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
Abstract
The invention discloses a system and a method for regulating a PFC circuit control signal, wherein the system comprises a feedforward module, a feedforward coefficient regulating module, a current-voltage control loop and a PFC control signal generating module, wherein the feedforward module is used for obtaining a feedforward duty ratio according to a mains supply input voltage; the feedforward coefficient adjusting module is used for generating a feedforward adjusting coefficient F for adjusting the feedforward duty ratio according to the mains supply input voltage, and adjusting the feedforward duty ratio by adopting the feedforward adjusting coefficient F; the current-voltage control loop is used for generating a loop duty ratio according to the output voltage and the output current of the PFC circuit; the PFC control signal generation module is used for obtaining the control signal duty ratio of the PFC circuit according to the feedforward duty ratio regulated by the feedforward coefficient regulation module and the loop duty ratio output by the current-voltage control loop. By adopting the technical scheme of the invention, overcurrent faults caused by PFC current can be prevented.
Description
Technical Field
The invention relates to the field of PFC circuits, in particular to a system and a method for adjusting a control signal of a PFC circuit.
Background
The PFC circuit mainly aims at improving THD and PF indexes of power supply products and electric appliances, and the most important performance is the good or bad of power grid adaptability. Various problems can occur in the power grid, wherein the power grid is the most important, the electric appliance cannot work normally if the electric appliance is light, and the electric appliance equipment can be burnt out if the electric appliance is heavy, and even the power grid is damaged. In the face of sudden changes in the power grid, it is most important that the PFC circuit can complete the dynamic adjustment process in time to adapt to the changes in the power grid.
Fig. 1 is a typical PFC control block diagram in general, which is composed of a feedforward module and a voltage-current control loop (feedforward plus double loop), and the output of the feedforward module and the output of the voltage-current control loop are superimposed to generate a duty ratio of a pulse signal for controlling the PFC circuit.
In the control system of the PFC circuit shown in fig. 1, in order to realize the current-following voltage, the current command includes the frequency of the voltage andphase information, phase lock module is used. The phase-locked module has a certain time delay when tracking the change of the mains supply, and is generally one to several mains supply periods. And the power grid is suddenly changed at a moment. The expression of the output duty ratio of the feedforward module is that(Vout-Vin)/Vout. Wherein Vout is output voltage of the PFC circuit, and Vin is input voltage of the mains supply. When the mains supply suddenly changes, the duty cycle d changes instantaneously. Once the input mains supply suddenly changes, the feedforward module can directly advance the loop action according to the mains supply, and the output of the voltage and current control loop is lagged, so that the condition that the duty ratio of the overall output is larger than 1 (namely, the PFC switch tube in the PFC circuit is normally on) is likely to occur, and overcurrent protection is likely to be caused due to the overlarge duty ratio.
Disclosure of Invention
The invention aims to solve the technical problem that the existing PFC circuit is poor in adaptability to power grid shock, and provides a system and a method for adjusting a PFC circuit control signal.
In the embodiment of the invention, a regulating system of a PFC circuit control signal is provided, which comprises a feedforward module, a feedforward coefficient regulating module, a current-voltage control loop and a PFC control signal generating module,
the feedforward module is used for obtaining feedforward duty ratio Dforward according to the mains supply input voltage;
the feedforward coefficient adjusting module is used for generating a feedforward adjusting coefficient F for adjusting the feedforward duty ratio Dforward according to the mains input voltage, and adjusting the feedforward duty ratio Dforward by adopting the feedforward adjusting coefficient F;
the current-voltage control loop is used for generating a loop duty ratio Dloop according to the output voltage Ved and the output current Ifed of the PFC circuit;
the PFC control signal generation module is used for obtaining the control signal duty ratio Dpfc of the PFC circuit according to the feedforward duty ratio regulated by the feedforward coefficient regulation module and the loop duty ratio Dloop output by the current-voltage control loop, and the calculation formula is as follows:
Dpfc=Dloop+Dforward*F。
in the embodiment of the present invention, the formula for calculating the feedforward duty ratio Dforward by the feedforward module is as follows:
Dforward= (Vout-Vin)/ Vout，
wherein Vout is output voltage of the PFC circuit, and Vin is mains input voltage.
In the embodiment of the invention, the current-voltage control loop comprises a phase-locked module, a voltage PI regulator and a current PI regulator,
the phase locking module is used for outputting phase information of the mains supply;
the voltage PI regulator is used for PI regulating the difference value between the output voltage Ved of the PFC circuit and the set command voltage Vref, and the current signal output by the voltage PI regulator obtains command current Iref according to the phase information output by the phase-locked module;
and the current PI regulator is used for PI regulating the difference value between the output current Ifed of the PFC circuit and the instruction current Iref to obtain the loop duty ratio Dloop output by the current-voltage control loop.
In the embodiment of the present invention, the process of generating the feedforward adjustment coefficient F by the feedforward coefficient adjustment module according to the mains input voltage includes:
detecting the input mains voltage;
when the mains voltage Vin is the maximum working voltage Vmax of the PFC circuit, the feedforward coefficient f=fmax, where Fmax is a preset coefficient corresponding to the maximum voltage;
when the mains voltage Vin is the minimum working voltage Vmin of the PFC circuit, the feedforward coefficient f=fmin, where Fmin is a coefficient corresponding to the minimum voltage set in advance;
when the mains voltage Vin is between Vmin and Vmax, the feedforward coefficient F is calculated as follows:
F=Vin* (Fmax-Fmin)/( Vmax-Vmin)。
in an embodiment of the present invention, there is also provided a method for adjusting a PFC circuit control signal, including:
obtaining a feedforward duty ratio Dforward according to the mains supply input voltage;
generating a feedforward regulating coefficient F for regulating the feedforward duty ratio Dforward according to the mains supply input voltage, and regulating the feedforward duty ratio Dforward by adopting the feedforward regulating coefficient F;
loop regulation is carried out according to the output voltage Vfed and the output current Ifed of the PFC circuit, and a loop duty ratio Dloop is generated;
and obtaining a control signal duty ratio Dpfc of the PFC circuit according to the feedforward duty ratio regulated by the feedforward coefficient regulating module and the loop duty ratio Dloop output by the current-voltage control loop, wherein the calculation formula is as follows:
Dpfc=Dloop+Dforward*F。
in the embodiment of the invention, the formula for obtaining the feedforward duty ratio Dforward according to the mains input voltage is as follows:
Dforward= (Vout-Vin)/ Vout，
wherein Vout is output voltage of the PFC circuit, and Vin is mains input voltage.
In the embodiment of the invention, the loop regulation is carried out according to the output voltage Vfed and the output current Ifed of the PFC circuit, and the process of generating the loop duty ratio Dloop comprises the following steps: ,
PI regulation is carried out on the difference value between the output voltage Ved of the PFC circuit and the set command voltage Vref by adopting a voltage PI regulator;
obtaining a command current Iref according to the current signal output by the voltage PI regulator and the phase information of the mains supply;
and a current PI regulator is used for PI regulation of the difference value between the output current Ifed of the PFC circuit and the instruction current Iref, so as to obtain the loop duty ratio Dloop output by the current-voltage control loop.
In the embodiment of the invention, the process of generating the feedforward adjustment coefficient F according to the mains input voltage comprises the following steps:
detecting the input mains voltage;
when the mains voltage Vin is the maximum working voltage Vmax of the PFC circuit, the feedforward coefficient f=fmax, where Fmax is a preset coefficient corresponding to the maximum voltage;
when the mains voltage Vin is the minimum working voltage Vmin of the PFC circuit, the feedforward coefficient f=fmin, where Fmin is a coefficient corresponding to the minimum voltage set in advance;
when the mains voltage Vin is between Vmin and Vmax, the feedforward coefficient F is calculated as follows:
F=Vin* (Fmax-Fmin)/( Vmax-Vmin)。
compared with the prior art, in the system and the method for adjusting the control signal of the PFC circuit, the feedforward duty ratio is controlled in a proper range by dynamically adjusting the feedforward coefficient, the PFC circuit cannot generate the overcurrent condition, the maximum value of the feedforward output duty ratio is timely limited when the mains supply suddenly changes, and the feedforward duty ratio is dynamically adjusted according to the input voltage of the mains supply and the output of the double loop, so that the overcurrent protection can be avoided while the response action change of the PFC circuit is quickened.
Drawings
Fig. 1 is a schematic structural diagram of a control signal conditioning system of a PFC circuit according to the prior art;
fig. 2 is a schematic structural diagram of a regulation system of a PFC circuit control signal according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for adjusting a feedforward coefficient of the PFC circuit according to an embodiment of the present invention.
Detailed Description
As shown in fig. 2, the regulation system of the PFC circuit control signal provided in the embodiment of the present invention includes a feedforward module, a feedforward coefficient regulation module, a current-voltage control loop, and a PFC control signal generation module. The feedforward module is used for obtaining feedforward duty ratio Dforward according to the change of the mains supply. The feedforward coefficient adjusting module is used for generating a feedforward adjusting coefficient F for adjusting the feedforward duty ratio Dforward according to the voltage of the mains supply, and adjusting the feedforward duty ratio Dforward by adopting the feedforward adjusting coefficient F. The current-voltage control loop is used for generating a loop duty ratio Dloop according to the output voltage Ved and the output current Ifed of the PFC circuit. The PFC control signal generation module is used for obtaining the control signal duty ratio Dpfc of the PFC circuit according to the feedforward duty ratio regulated by the feedforward coefficient regulation module and the loop duty ratio Dloop output by the current-voltage control loop, and the specific calculation formula is as follows:
Dpfc=Dloop+Dforward*F。
the feedforward module is used for obtaining a feedforward duty ratio signal Dforward according to the change of the mains supply, and the feedforward duty ratio Dforward has the following calculation formula:
Dforward= (Vout-Vin)/ Vout，
wherein Vout is output voltage of the PFC circuit, and Vin is mains input voltage.
The current-voltage control loop is used for performing double loop adjustment according to the output voltage Vfed, the output current Ifed, the set command voltage Vref and the phase information of the mains supply of the PFC circuit, and outputting the duty ratio Dloop of the loop. The current-voltage control loop comprises a phase-locked module, a voltage PI regulator and a current PI regulator. The voltage PI regulator is used for PI regulating the output voltage Ved of the PFC circuit and the set command voltage Vref, and the current signal output by the voltage PI regulator obtains the command current Iref according to the phase information output by the phase-locked module. And the current PI regulator is used for PI regulating the output current Ifed of the PFC circuit and the instruction current Iref to obtain the loop duty ratio Dloop output by the current-voltage control loop.
The feedforward coefficient adjusting module is used for obtaining an adjusting coefficient F of feedforward duty ratio dForward according to the magnitude of input mains voltage, dynamically adjusting the feedforward duty ratio Dforward, and dynamically adjusting the feedforward duty ratio Dforward when the mains voltage changes, so that the control signal duty ratio Dpfc of the PFC circuit is in a proper range, and the output of the PFC circuit cannot be over-current.
It should be noted that, without the feedforward coefficient adjusting module, the duty ratio of the control signal of the PFC circuit, dfc=dloop+dforrd. The feed forward duty cycle Dforward will change immediately when the input mains voltage changes. The loop duty ratio Dloop output by the current-voltage control loop is as follows when responding to the change of input mains supply: the first step, as the commercial power is increased (or decreased), the output voltage of the PFC circuit is increased (or decreased); secondly, as the PFC output voltage becomes larger (or smaller) and the feedback voltage VFed which is sampled back to the loop becomes larger (or smaller), negative errors (or positive errors) occur in the voltage control loop; third, the control loop acts to cancel the error, and thus adjusts the output loop duty cycle Dloop based on the error. It can be seen that the regulation of the loop takes time, which lags behind the change in the input mains voltage. When the mains supply changes, the duty ratio of the control signal of the PFC circuit can be excessively large to cause overcurrent due to timely response of feedforward and loop regulation delay.
FIG. 3 is a schematic diagram of an algorithm for implementing dynamic feedforward coefficient adjustment by the feedforward coefficient adjustment module. The specific process is as follows:
detecting the input mains voltage;
when the mains voltage Vin is the maximum working voltage Vmax of the PFC circuit, the feedforward coefficient f=fmax, where Fmax is a preset coefficient corresponding to the maximum voltage;
when the mains voltage Vin is the minimum working voltage Vmin of the PFC circuit, the feedforward coefficient f=fmin, where Fmin is a coefficient corresponding to the minimum voltage set in advance;
when the mains voltage Vin is between Vmin and Vmax, the feedforward coefficient F is calculated as follows:
F=Vin* (Fmax-Fmin)/( Vmax-Vmin)。
it should be noted that PFC circuits generally have a voltage operating range (Vmin, vmax) for regulating abrupt changes in the mains voltage. Therefore, in the embodiment of the invention, the feedforward duty ratio calculated at the moment is in a proper range by presetting the feedforward coefficients Fmax and Fmin at the maximum working voltage and the minimum working voltage of the PFC circuit, so that the output of the PFC circuit cannot overflow. As the commercial power cannot flow excessively in the limit voltage of the PFC circuit, and the feedforward coefficient is calculated according to the formula in the working voltage interval of the PFC circuit, the problem of overcurrent cannot exist in the working voltage interval of the PFC circuit.
In summary, in the system and the method for adjusting the control signal of the PFC circuit according to the present invention, the feedforward duty ratio is controlled within a suitable range by dynamically adjusting the feedforward coefficient, so that the PFC circuit does not have an overcurrent condition, and when the mains supply suddenly changes, the maximum value of the feedforward output duty ratio is timely limited.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. A PFC circuit control signal regulating system is characterized by comprising a feedforward module, a feedforward coefficient regulating module, a current-voltage control loop and a PFC control signal generating module,
the feedforward module is used for obtaining feedforward duty ratio Dforward according to the mains supply input voltage;
the feedforward coefficient adjusting module is used for generating a feedforward adjusting coefficient F for adjusting the feedforward duty ratio Dforward according to the mains input voltage, and adjusting the feedforward duty ratio Dforward by adopting the feedforward adjusting coefficient F;
the current-voltage control loop is used for generating a loop duty ratio Dloop according to the output voltage Ved and the output current Ifed of the PFC circuit;
the PFC control signal generation module is used for obtaining the control signal duty ratio Dpfc of the PFC circuit according to the feedforward duty ratio regulated by the feedforward coefficient regulation module and the loop duty ratio Dloop output by the current-voltage control loop, and the calculation formula is as follows:
Dpfc=Dloop+Dforward*F，
the feedforward coefficient adjusting module generates a feedforward adjusting coefficient F according to the mains input voltage, and the feedforward coefficient adjusting module comprises the following steps:
detecting the input mains voltage;
when the mains voltage Vin is the maximum working voltage Vmax of the PFC circuit, the feedforward adjustment coefficient f=fmax, where Fmax is a coefficient corresponding to the preset maximum working voltage Vmax;
when the mains voltage Vin is the minimum working voltage Vmin of the PFC circuit, the feedforward adjustment coefficient f=fmin, where Fmin is a coefficient corresponding to the preset minimum working voltage Vmin;
when the mains voltage Vin is between Vmin and Vmax, the feedforward adjustment coefficient F is calculated as follows:
F=Vin* (Fmax-Fmin)/( Vmax-Vmin)。
2. the PFC circuit control signal conditioning system of claim 1 wherein the feedforward module calculates a feedforward duty cycle Dforward as follows:
Dforward=(Vout-Vin)/ Vout，
wherein Vout is output voltage of the PFC circuit, and Vin is mains input voltage.
3. The PFC circuit control signal conditioning system of claim 1 wherein the current-to-voltage control loop includes a phase-locked module, a voltage PI regulator, and a current PI regulator,
the phase locking module is used for outputting phase information of the mains supply;
the voltage PI regulator is used for PI regulating the difference value between the output voltage Ved of the PFC circuit and the set command voltage Vref, and the current signal output by the voltage PI regulator obtains command current Iref according to the phase information output by the phase-locked module;
and the current PI regulator is used for PI regulating the difference value between the output current Ifed of the PFC circuit and the instruction current Iref to obtain the loop duty ratio Dloop output by the current-voltage control loop.
4. The method for adjusting the control signal of the PFC circuit is characterized by comprising the following steps of:
obtaining a feedforward duty ratio Dforward according to the mains supply input voltage;
generating a feedforward regulating coefficient F for regulating the feedforward duty ratio Dforward according to the mains supply input voltage, and regulating the feedforward duty ratio Dforward by adopting the feedforward regulating coefficient F;
loop regulation is carried out according to the output voltage Vfed and the output current Ifed of the PFC circuit, and a loop duty ratio Dloop is generated;
and obtaining a control signal duty ratio Dpfc of the PFC circuit according to the feedforward duty ratio Dforward and the loop duty ratio Dloop after the feedforward adjustment coefficient F is adjusted, wherein the calculation formula is as follows:
Dpfc=Dloop+Dforward*F，
the process for generating the feedforward adjustment coefficient F according to the mains input voltage comprises the following steps:
detecting the input mains voltage;
when the mains voltage Vin is the maximum working voltage Vmax of the PFC circuit, the feedforward adjustment coefficient f=fmax, where Fmax is a coefficient corresponding to the preset maximum working voltage Vmax;
when the mains voltage Vin is the minimum working voltage Vmin of the PFC circuit, the feedforward adjustment coefficient f=fmin, where Fmin is a coefficient corresponding to the preset minimum working voltage Vmin;
when the mains voltage Vin is between Vmin and Vmax, the feedforward adjustment coefficient F is calculated as follows:
F=Vin* (Fmax-Fmin)/( Vmax-Vmin)。
5. the method of claim 4, wherein the feedforward duty cycle Dforward is obtained according to the mains input voltage as follows:
Dforward=(Vout-Vin)/ Vout，
wherein Vout is output voltage of the PFC circuit, and Vin is mains input voltage.
6. The method of adjusting a control signal of a PFC circuit according to claim 4, wherein the step of generating a loop duty cycle Dloop by performing loop adjustment according to an output voltage Ved and an output current Ifed of the PFC circuit includes:
PI regulation is carried out on the difference value between the output voltage Ved of the PFC circuit and the set command voltage Vref by adopting a voltage PI regulator;
obtaining a command current Iref according to the current signal output by the voltage PI regulator and the phase information of the mains supply;
and a current PI regulator is used for PI regulation of the difference value between the output current Ifed of the PFC circuit and the instruction current Iref, so as to obtain a loop duty cycle Dloop.
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