CN116995912A - Correction method, device, equipment and medium based on power factor correction circuit - Google Patents

Correction method, device, equipment and medium based on power factor correction circuit Download PDF

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Publication number
CN116995912A
CN116995912A CN202311136271.5A CN202311136271A CN116995912A CN 116995912 A CN116995912 A CN 116995912A CN 202311136271 A CN202311136271 A CN 202311136271A CN 116995912 A CN116995912 A CN 116995912A
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China
Prior art keywords
intermittent
current
power factor
sampling current
determining
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CN202311136271.5A
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Inventor
任磊
杨成林
吴能峰
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Invt Power Sytem Shenzhen Co ltd
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Invt Power Sytem Shenzhen Co ltd
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Priority to CN202311136271.5A priority Critical patent/CN116995912A/en
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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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • 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
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention discloses a correction method, a correction device, correction equipment and correction media based on a power factor correction circuit, and relates to the technical field of alternating current power supplies. Determining that the power factor correction circuit is in an intermittent mode and a first mapping relation between the corresponding intermittent duty ratio and the continuous duty ratio in the intermittent mode to obtain a duty ratio feedforward coefficient according to the acquired power related parameters; determining a second mapping relation between the intermittent sampling current and the continuous intermittent sampling current corresponding to the intermittent mode and the continuous mode according to the power related parameters to obtain a sampling current correction coefficient; and the feedforward coefficient of the duty ratio and the correction coefficient of the sampling current are corrected in real time, so that on one hand, the influence of the duty ratio error on the input current distortion generated by the advanced input voltage of the input current near the zero crossing point in the intermittent mode is avoided, on the other hand, the correction coefficient of the sampling current is introduced, the problem that the related parameters of the power correction circuit are not easy to set is avoided, the input total harmonic distortion rate is reduced, and the stability of the power correction circuit is improved.

Description

Correction method, device, equipment and medium based on power factor correction circuit
Technical Field
The present invention relates to the technical field of ac power supplies, and in particular, to a correction method, apparatus, device, and medium based on a power factor correction circuit.
Background
In a medium-high power Online uninterruptible power supply (Online Uninterruptible Power Supply, online UPS) system, a main circuit of the system is generally configured as a high-power rectifier, an inverter and a load which are sequentially connected, wherein the high-power rectifier rectifies an ac voltage (which can be understood as an ac mains voltage 220V) into a dc bus voltage, and the inverter converts the dc bus voltage into an ac voltage (the value of the ac voltage is generally smaller than 220V) and outputs the ac voltage to the load. For high power rectifiers two functions must be provided: firstly, controlling the voltage stabilization of a direct current bus; second, the input current of the high-power rectifier must follow the input voltage to have a power factor of 1, i.e., must have a power correction function, and therefore, a power factor correction circuit (Power Factor Correction, PFC) is generally provided in the high-power rectifier.
The PFC circuit has two working modes of an intermittent mode and a continuous mode under the normal working state, when the input current passes through a zero point or is lightly loaded, the PFC circuit operates in the intermittent mode, and when the input current does not pass through the zero point or is heavily loaded, the PFC circuit operates in the continuous mode. Regardless of whether the PFC circuit operates in an intermittent mode or a continuous mode, the duty ratio feedforward coefficient of the PFC closed-loop control loop has an influence on the advanced input voltage of the input current near the zero crossing point, so that the input current is distorted, and the input total harmonic distortion rate of the input current is further influenced.
In view of the above-mentioned problems, it is sought to avoid the influence of the duty ratio on the input current near the zero crossing point in the discontinuous mode of the PFC closed loop control loop, to eliminate the distortion on the input current, to reduce the influence on the input total harmonic distortion rate of the input current, and to avoid the deviation of the value of the inductor current sample in the PFC discontinuous mode from the periodic average value, and to eliminate the problem that the control loop parameters are difficult to set, which is a problem to be solved by the skilled person in the art.
Disclosure of Invention
The invention aims to provide a correction method, a device, equipment and a medium based on a power factor correction circuit, which are used for solving the problems that the duty ratio in the intermittent mode of a PFC closed loop control loop influences the advanced input voltage of input current near a zero crossing point, so that the input current is distorted, the input total harmonic distortion rate of the input current is further influenced, and the parameter of the control loop is difficult to set due to the fact that the value of an inductor current sample in the PFC intermittent mode is larger than a period average value.
In order to solve the above technical problems, the present invention provides a correction method based on a power factor correction circuit, which is applied to a rectifier provided with the power factor correction circuit, wherein the rectifier is connected with an inverter, and the inverter is connected with a load, and the method comprises:
When various power related parameters are collected, determining the intermittent duty ratio of the power factor correction circuit in an intermittent mode;
determining a first mapping relation between the intermittent duty ratio and a continuous duty ratio of the power factor correction circuit in a continuous mode, and obtaining a duty ratio feedforward coefficient;
determining intermittent sampling current of the power factor correction circuit in an intermittent mode according to the power related parameters;
determining a second mapping relation between the intermittent sampling current and continuous intermittent sampling current of the power factor correction circuit in a continuous mode, and obtaining a sampling current correction coefficient;
and correcting the duty ratio feedforward coefficient and the sampling current correction coefficient in real time according to the first mapping relation and the second mapping relation.
In another aspect, the power-related parameters include at least: input voltage peak value, input current peak value, input voltage instantaneous value, input current instantaneous value, input power average value, angular frequency, phase information, switching frequency, inductance and inductance current; determining the intermittent duty cycle of the power factor correction circuit in the intermittent mode includes:
establishing a first equation based on the instantaneous value of the input current, the peak value of the input current, the angular frequency, the phase information, the switching frequency and the inductance, and the inductance current;
Establishing a second equation based on the input voltage instantaneous value, the input voltage peak value, the angular frequency, the phase information, the switching frequency and the inductance, and the inductance current;
establishing a third equation by using the input voltage peak value and the input current peak value;
and determining the intermittent duty ratio according to the first equation, the second equation and the third equation.
On the other hand, after determining the intermittent duty ratio according to the first equation, the second equation, and the third equation, the method further includes:
determining a duty cycle feedforward coefficient according to the intermittent duty cycle;
and determining a first mapping relation according to the duty ratio feedforward coefficient and the continuous duty ratio.
In another aspect, the power-related parameters include at least: a switching period, a forward peak value of a sampling current, a reverse peak value of the sampling current, an input current instantaneous value, an inductance value in the power factor correction circuit, an input voltage instantaneous value, an output voltage and a sampling current instantaneous value; determining a second mapping relationship between the intermittent sampling current and a continuous intermittent sampling current of the power factor correction circuit in a continuous mode includes:
establishing a fourth equation according to the switching period, the sampling current peak value and the input current instantaneous value;
establishing a fifth equation according to an inductance value, a switching period, a sampling current forward peak value and an input voltage instantaneous value in the power factor correction circuit;
Establishing a sixth equation according to the inductance value, the switching period, the sampling current reverse peak value, the input voltage instantaneous value and the output voltage in the power factor correction circuit;
establishing a seventh equation according to the instantaneous value of the sampling current and the forward peak value of the sampling current;
and determining a second mapping relation according to the fourth equation, the fifth equation, the sixth equation and the seventh equation.
In another aspect, before correcting the duty ratio feedforward coefficient and the sampling current correction coefficient in real time according to the first mapping relation and the second mapping relation, the method further includes:
determining the relation between the periodic average value of the inductance current and the inductance current sampling value;
determining a sampling current correction coefficient according to the relation between the periodic average value of the inductance current and the sampling value of the inductance current;
and respectively determining corresponding continuous sampling current correction coefficients and intermittent sampling current correction coefficients according to the continuous mode and the intermittent mode.
On the other hand, determining the corresponding continuous sampling current correction coefficient and intermittent sampling current correction coefficient according to the continuous mode and intermittent mode, respectively, includes:
judging whether the power factor correction circuit is in an intermittent mode or not;
if not, determining that the continuous sampling current correction coefficient is 1;
if yes, determining an intermittent sampling current correction coefficient according to the output voltage, the intermittent duty ratio and the input voltage instantaneous value.
On the other hand, after determining the intermittent sampling current correction coefficient from the output voltage, the intermittent duty ratio, and the input voltage instantaneous value, the method further includes:
updating the intermittent sampling current correction coefficient, wherein the intermittent sampling current correction coefficient is smaller than 1.
In order to solve the above technical problem, the present invention further provides a correction device based on a power factor correction circuit, which is applied to a rectifier provided with the power factor correction circuit, and the rectifier is connected with an inverter, and the inverter is connected with a load, and the device comprises:
the first determining module is used for determining the intermittent duty ratio of the power factor correction circuit in an intermittent mode when various power related parameters are acquired;
the first determining and obtaining module is used for determining a first mapping relation between the intermittent duty ratio and the continuous duty ratio of the power factor correction circuit in a continuous mode and obtaining a duty ratio feedforward coefficient;
the second determining module is used for determining intermittent sampling current of the power factor correction circuit in an intermittent mode according to the power related parameters;
a second determining and obtaining module, configured to determine a second mapping relationship between the intermittent sampling current and the continuous intermittent sampling current of the pfc circuit in the continuous mode, and obtain a sampling current correction coefficient;
And the real-time correction module is used for correcting the duty ratio feedforward coefficient and the sampling current correction coefficient in real time according to the first mapping relation and the second mapping relation.
Furthermore, the device comprises the following modules:
in another aspect, the power-related parameters include at least: input voltage peak value, input current peak value, input voltage instantaneous value, input current instantaneous value, input power average value, angular frequency, phase information, switching frequency, inductance and inductance current; determining the intermittent duty cycle of the power factor correction circuit in the intermittent mode includes:
the first establishing module is used for establishing a first equation under the condition of an input current instantaneous value, an input current peak value, an angular frequency, phase information, a switching frequency and an inductance;
the second establishing module is used for establishing a second equation under the condition of an input voltage instantaneous value, an input voltage peak value, an angular frequency, phase information, a switching frequency, an inductance and an inductance current;
the third establishing module is used for establishing a third equation by using the input voltage peak value and the input current peak value;
and the third determining module is used for determining the intermittent duty ratio according to the first equation, the second equation and the third equation.
On the other hand, after determining the intermittent duty ratio according to the first equation, the second equation, and the third equation, the method further includes:
a fourth determining module, configured to determine a duty cycle feedforward coefficient according to the intermittent duty cycle;
and a fifth determining module, configured to determine the first mapping relationship according to the duty ratio feedforward coefficient and the continuous duty ratio.
In another aspect, the power-related parameters include at least: a switching period, a forward peak value of a sampling current, a reverse peak value of the sampling current, an input current instantaneous value, an inductance value in the power factor correction circuit, an input voltage instantaneous value, an output voltage and a sampling current instantaneous value; determining a second mapping relationship between the intermittent sampling current and a continuous intermittent sampling current of the power factor correction circuit in a continuous mode includes:
the fourth establishing module is used for establishing a fourth equation according to the switching period, the sampling current peak value and the input current instantaneous value;
the fifth establishing module is used for establishing a fifth equation according to the inductance value, the switching period, the forward peak value of the sampling current and the instantaneous value of the input voltage in the power factor correction circuit;
the sixth establishing module is used for establishing a sixth equation according to the inductance value, the switching period, the sampling current reverse peak value, the input voltage instantaneous value and the output voltage in the power factor correction circuit;
The seventh establishing module is used for establishing a seventh equation according to the instantaneous value of the sampling current and the forward peak value of the sampling current;
and the sixth determining module is used for determining the second mapping relation according to the fourth equation, the fifth equation, the sixth equation and the seventh equation.
In another aspect, before correcting the duty ratio feedforward coefficient and the sampling current correction coefficient in real time according to the first mapping relation and the second mapping relation, the method further includes:
a seventh determining module, configured to determine a relationship between a periodic average value of the inductor current and a sampling value of the inductor current;
an eighth determining module, configured to determine a sampling current correction coefficient according to a relationship between a periodic average value of the inductor current and a sampling value of the inductor current;
and a ninth determining module, configured to determine a continuous sampling current correction coefficient and an intermittent sampling current correction coefficient according to the continuous mode and the intermittent mode, respectively.
On the other hand, determining the corresponding continuous sampling current correction coefficient and intermittent sampling current correction coefficient according to the continuous mode and intermittent mode, respectively, includes:
the judging module is used for judging whether the power factor correction circuit is in an intermittent mode or not;
if not, triggering a tenth determining module for determining that the continuous sampling current correction coefficient is 1;
If yes, triggering an eleventh determining module for determining the intermittent sampling current correction coefficient according to the output voltage, the intermittent duty ratio and the input voltage instantaneous value.
On the other hand, after determining the intermittent sampling current correction coefficient from the output voltage, the intermittent duty ratio, and the input voltage instantaneous value, the method further includes:
and the updating module is used for updating the intermittent sampling current correction coefficient, and the intermittent sampling current correction coefficient is smaller than 1.
In order to solve the technical problem, the present invention further provides a correction device based on a power factor correction circuit, including:
a memory for storing a computer program;
and a processor for pointing to a computer program for implementing the steps of the correction method based on the power factor correction circuit.
In order to solve the above technical problem, the present invention further provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the correction method based on the power factor correction circuit.
The invention provides a correction method based on a power factor correction circuit, which is applied to a rectifier provided with the power factor correction circuit, wherein the rectifier is connected with an inverter, and the inverter is connected with a load, and the method comprises the following steps: when various power related parameters are collected, determining the intermittent duty ratio of the power factor correction circuit in an intermittent mode; determining a first mapping relation between the intermittent duty ratio and a continuous duty ratio of the power factor correction circuit in a continuous mode, and obtaining a duty ratio feedforward coefficient; determining intermittent sampling current of the power factor correction circuit in an intermittent mode according to the power related parameters; determining a second mapping relation between the intermittent sampling current and continuous intermittent sampling current of the power factor correction circuit in a continuous mode, and obtaining a sampling current correction coefficient; according to the first mapping relation and the second mapping relation, the duty ratio feedforward coefficient and the sampling current correction coefficient are corrected in real time, and the duty ratio feedforward coefficient and the sampling current correction coefficient can be corrected in real time, so that on one hand, the influence of the duty ratio feedforward coefficient on the advanced input voltage of the input current near the zero crossing point is avoided, on the other hand, the sampling current correction coefficient is introduced to avoid the distortion of the input current, and meanwhile, the influence on the input total harmonic distortion rate of the input current can be reduced.
The invention also provides a correction device, equipment and medium based on the power factor correction circuit, and the effects are the same as above.
Drawings
For a clearer description of embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
Fig. 1 is a flowchart of a correction method based on a power factor correction circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an intermittent mode waveform according to an embodiment of the present invention;
FIG. 3 is a waveform diagram of a continuous mode according to an embodiment of the present invention;
FIG. 4 is a flow chart of correction according to the duty cycle feedforward coefficient according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a sampling current transient provided by an embodiment of the present invention;
FIG. 6 is a flowchart of a correction according to the intermittent sampling current correction coefficient according to an embodiment of the present invention;
fig. 7 is a diagram of a correction device based on a power factor correction circuit according to an embodiment of the present invention;
Fig. 8 is a block diagram of a correction device based on a pfc circuit according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making any inventive effort are within the scope of the present invention.
The invention provides a correction method, a device, equipment and a medium based on a power factor correction circuit, which can avoid the influence of a feedforward duty ratio of a PFC closed-loop control loop on the advanced input voltage of input current near a zero crossing point, eliminate the distortion generated on the input current, reduce the influence on the input total harmonic distortion rate of the input current and the influence on a control loop caused by the fact that the sampling of an inductance current is larger than the average value of an actual period in an intermittent mode.
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.
Since in the uninterruptible power supply, the system consists of a rectifier, an inverter and an output load, wherein the rectifier is a rectifier with a power factor correction circuit, and as a more preferable mode, the rectifier is determined as a three-level Vienna rectifier; the rectifier is connected with the inverter in sequence, and the inverter is connected with the output load. In some embodiments, software control in a system of uninterruptible power supplies employs proportional-integral regulation controllers.
It will be appreciated that the PFC circuit may operate in either an intermittent mode or a continuous mode with different control parameters to facilitate control using the different control parameters. The control of the PFC circuit is typically controlled by a duty cycle parameter, wherein the duty cycle of the PFC closed-loop control loop output = theoretical duty cycle + proportional integral regulator output. When the input current passes through the zero point, the duty ratio of the feedforward of the PFC closed-loop control loop is a continuous duty ratio, and the continuous duty ratio is larger than the intermittent duty ratio at the moment, so that the duty ratio actually required is smaller than the duty ratio calculated by the closed-loop control loop when the input current passes through the zero point, the duty ratio is in an overshoot condition, and the input current near the zero point of the input current leads the input voltage to cause the distortion of the input current.
Fig. 1 is a flowchart of a correction method based on a pfc circuit according to an embodiment of the present invention, as shown in fig. 1, the correction method based on the pfc circuit includes:
s10: when various power related parameters are collected, determining the intermittent duty ratio of the power factor correction circuit in an intermittent mode;
s11: determining a first mapping relation between the intermittent duty ratio and a continuous duty ratio of the power factor correction circuit in a continuous mode, and obtaining a duty ratio feedforward coefficient;
s12: determining intermittent sampling current of the power factor correction circuit in an intermittent mode according to the power related parameters;
s13: determining a second mapping relation between the intermittent sampling current and continuous intermittent sampling current of the power factor correction circuit in a continuous mode, and obtaining a sampling current correction coefficient;
s14: and correcting the duty ratio feedforward coefficient and the sampling current correction coefficient in real time according to the first mapping relation and the second mapping relation.
The duty ratio feedforward coefficient is further divided into a duty ratio feedforward coefficient with strong real-time property and a duty ratio feedforward coefficient with non-real-time property, and the duty ratio feedforward coefficient with strong real-time property needs to be controlled by interrupt; in order to improve the efficiency of interrupt control, the duty feedforward coefficient having high non-real time performance needs to be processed by a set 5ms task.
In addition, in this embodiment, a specific manner of determining that the duty ratio feedforward coefficient is a duty ratio feedforward coefficient with strong instantaneity or a duty ratio feedforward coefficient with non-instantaneity is provided: at this time, the real-time evaluation parameter can be compared with the obtained duty ratio feedforward coefficient, when the real-time evaluation parameter of the obtained duty ratio feedforward coefficient reaches the preset real-time evaluation parameter, the obtained duty ratio feedforward coefficient is determined to be the duty ratio feedforward coefficient with strong real-time performance, and when the real-time evaluation parameter of the obtained duty ratio feedforward coefficient does not reach the preset real-time evaluation parameter, the obtained duty ratio feedforward coefficient is determined to be the duty ratio feedforward coefficient with strong non-real-time performance.
Because the embodiment can correct the duty ratio feedforward coefficient and the sampling current correction coefficient in real time, on one hand, the influence of the duty ratio feedforward coefficient on the input current near the zero crossing point, which is caused by leading the input voltage, is avoided, on the other hand, the problem of system instability caused by difficult setting of control loop parameters is avoided by introducing the sampling current correction coefficient, and the influence on the input total harmonic distortion rate of the input current can be reduced.
FIG. 2 is a schematic diagram of an intermittent waveform according to an embodiment of the present invention, as shown in FIG. 2, in a switching period T s In, the inductor current drops to 0 during the switch turn-off period and the next switching period T s And (5) disconnecting. At this time, the signal period corresponding to the high level part of the square waveform is denoted as DT s The method comprises the steps of carrying out a first treatment on the surface of the The signal period corresponding to the low level part of the square waveform is denoted as D' T s . FIG. 3 is a waveform diagram of a continuous mode according to an embodiment of the present invention, as shown in FIG. 3, two switching periods T are continued s In, the inductor current drops to 0 during the switching-off period and the next switching period T s Connecting; at this time, the signal period corresponding to the high level part of the square waveform is denoted as DT s The method comprises the steps of carrying out a first treatment on the surface of the The signal period corresponding to the low level part of the square waveform is denoted as (1-D) T s 。
In this embodiment, the power-related parameters include at least: input voltage peak value, input current peak value, input voltage instantaneous value, input current instantaneous value, input power average value, angular frequency, phase information, switching frequency, inductance and inductance current; determining the intermittent duty cycle of the power factor correction circuit in the intermittent mode at this time includes:
instantaneous input current Time value I in Peak value of input current I acpeak Establishing a first equation under the conditions of the angular frequency w and the input time t; in addition, parameters such as phase information, switching frequency, inductance, inductance current and the like can be used;
the first equation expression is as follows:
I in ＝I acpeak sinwt；
with instantaneous value U of input voltage in Peak value of input voltage V acpeak Establishing a second equation under the conditions of the angular frequency w and the input time t; in addition, parameters such as phase information, switching frequency, inductance, inductance current and the like can be used;
the second equation expression is as follows:
U in ＝V acpeak sinwt；
establishing a third equation by using the input voltage peak value and the input current peak value;
the third party expression is as follows:
2P in ＝V acpeak I acpeak ；
wherein P is in Is the average value of the input power;
and determining the intermittent duty ratio according to the first equation, the second equation and the third equation.
After determining the intermittent duty cycle according to the first equation, the second equation, and the third equation, the method further includes:
determining a duty cycle feedforward coefficient Coff1 according to the intermittent duty cycle;
the expression of the duty cycle feedforward coefficient is as follows:
wherein L is an inductance value in the PFC circuit, f s Is the switching frequency;
determining a first mapping relation according to the duty ratio feedforward coefficient and the continuous duty ratio;
the expression of the first mapping relationship is as follows:
Wherein D is dcm For intermittent duty cycle, D ccm For continuous duty cycle, U 0 To output voltage U in (t) is an input voltage instantaneous value obtained on the condition of the input time t;
the above equation is simplified to:
wherein D is ccm And (t) is a continuous duty ratio obtained on the condition of the input time t.
Fig. 4 is a flowchart of correction according to a duty ratio feedforward coefficient according to an embodiment of the present invention, as shown in fig. 4, corresponding to the above embodiment, wherein it is to be noted that:
obtaining continuous duty cycle D ccm (t)；
According to a continuous duty cycle D ccm (t) determining a duty cycle feedforward coefficient, wherein the duty cycle feedforward coefficient is expressed as follows:
determining the continuous duty cycle D ccm The quadratic value of (t)The quadratic value of the continuous duty ratio is calculated once in a control period;
determining a first mapping relation according to the duty ratio feedforward coefficient and the continuous duty ratio;
the expression of the first mapping relationship is as follows:
at this time, for the continuous duty ratio D ccm (t) and D dcm Taking the minimum value, the pattern results in a minimum value that is corrected, it being noted that in some embodiments, the duty cycle D is continuous ccm (t) is greater than D dcm Take the minimum value, at this time according to D dcm Correction is performed. In some embodiments, the power-related parameters include at least: switching period, forward peak value of sampling current, backward peak value of sampling current, instantaneous value of input current, inductance value in power factor correction circuit, instantaneous value of input voltage, output voltage and instantaneous value of sampling current; fig. 5 is a schematic diagram of an instantaneous value of a sampling current according to an embodiment of the present invention, as shown in fig. 5, where determining a second mapping relationship between an intermittent sampling current and a continuous intermittent sampling current of a pfc circuit in a continuous mode includes:
According to the switching period T s Peak value i of sampling current peak Instantaneous value of input current I in Establishing a fourth equation;
the fourth pass expression is as follows:
wherein D' is a value obtained by dividing a switching period by a time taken for the sampling current to drop to 0 from a peak value in the interrupt mode, and d=d dcm ；
According to inductance value L, switching period and sampling current forward peak value +i in power factor correction circuit peak Establishing a fifth equation of the input voltage instantaneous value;
according to inductance value, switching period and sampling current reverse peak value-i in power factor correction circuit peak Establishing a sixth equation by the input voltage instantaneous value and the output voltage;
based on the instantaneous value i of the sampling current sense Establishing a seventh equation by sampling the forward peak value of the current;
and determining a second mapping relation according to the fourth equation, the fifth equation, the sixth equation and the seventh equation.
Determining the relation between the instantaneous value of the input current and the instantaneous value of the sampling current (the relation between the periodic average value of the inductance current and the sampling value of the inductance current) according to a fourth equation, a fifth equation, a sixth equation and a seventh equation;
the method comprises the following steps: from the above formula, it can be deduced that:
then, it is possible to obtain:
determining a sampling current correction coefficient I according to the relation between the instantaneous value of the input current and the instantaneous value of the sampling current (the relation between the periodic average value of the inductive current and the sampling value of the inductive current) cal ；
The following can be obtained:
and respectively determining corresponding continuous sampling current correction coefficients and intermittent sampling current correction coefficients according to the continuous mode and the intermittent mode.
Fig. 6 is a flowchart of correction according to an intermittent sampling current correction coefficient according to an embodiment of the present invention, as shown in fig. 6, specifically:
acquisition of sampled electricityStream correction factor I cal The formula is as follows:
judging whether the power factor correction circuit is in an intermittent mode or not;
if not, determining that the continuous sampling current correction coefficient is 1;
at this time I cal ＝1；
If yes, determining an intermittent sampling current correction coefficient according to the output voltage, the intermittent duty ratio and the input voltage instantaneous value;
at this timeAccording to->Updating the intermittent sampling current correction coefficient, wherein the intermittent sampling current correction coefficient is smaller than 1.
In some embodiments, the resulting I cal =1 andtake the minimum value, wherein I cal =1 is greater thanTherefore, correction coefficient according to intermittent sampling current>Correction is performed.
In the above embodiments, the detailed description is given of the correction method based on the power factor correction circuit, and the present invention also provides the corresponding embodiments of the correction device based on the power factor correction circuit. It should be noted that the present invention describes an embodiment of the device portion from two angles, one based on the angle of the functional module and the other based on the angle of the hardware.
Fig. 7 is a block diagram of a correction device based on a pfc circuit according to an embodiment of the present invention, and as shown in fig. 7, the present invention further provides a correction device based on a pfc circuit, which is applied to a rectifier provided with a pfc circuit, wherein the rectifier is connected with an inverter, and the inverter is connected with a load, and the device includes:
a first determining module 70, configured to determine an intermittent duty cycle of the pfc circuit in an intermittent mode when a plurality of power related parameters are collected;
a first determining and obtaining module 71, configured to determine a first mapping relationship between the intermittent duty cycle and a continuous duty cycle of the pfc circuit in a continuous mode, and obtain a duty cycle feedforward coefficient;
a second determining module 72, configured to determine an intermittent sampling current of the pfc circuit in an intermittent mode according to the power related parameter;
a second determining and obtaining module 73, configured to determine a second mapping relationship between the intermittent sampling current and the continuous intermittent sampling current of the pfc circuit in the continuous mode, and obtain a sampling current correction coefficient;
the real-time correction module 74 is configured to correct the duty ratio feedforward coefficient and the sampling current correction coefficient in real time according to the first mapping relation and the second mapping relation.
Furthermore, the device comprises the following modules:
in some embodiments, the power-related parameters include at least: input voltage peak value, input current peak value, input voltage instantaneous value, input current instantaneous value, input power average value, angular frequency, phase information, switching frequency, inductance and inductance current; determining the intermittent duty cycle of the power factor correction circuit in the intermittent mode includes:
the first establishing module is used for establishing a first equation under the condition of an input current instantaneous value, an input current peak value, an angular frequency, phase information, a switching frequency and an inductance;
the second establishing module is used for establishing a second equation under the condition of an input voltage instantaneous value, an input voltage peak value, an angular frequency, phase information, a switching frequency, an inductance and an inductance current;
the third establishing module is used for establishing a third equation by using the input voltage peak value and the input current peak value;
and the third determining module is used for determining the intermittent duty ratio according to the first equation, the second equation and the third equation.
In some embodiments, after determining the intermittent duty cycle according to the first equation, the second equation, and the third equation, further comprising:
a fourth determining module, configured to determine a duty cycle feedforward coefficient according to the intermittent duty cycle;
And a fifth determining module, configured to determine the first mapping relationship according to the duty ratio feedforward coefficient and the continuous duty ratio.
In some embodiments, the power-related parameters include at least: switching period, forward peak value of sampling current, backward peak value of sampling current, instantaneous value of input current, inductance value in power factor correction circuit, instantaneous value of input voltage, output voltage and instantaneous value of sampling current; determining a second mapping relationship between the intermittent sampling current and a continuous intermittent sampling current of the power factor correction circuit in a continuous mode includes:
the fourth establishing module is used for establishing a fourth equation according to the switching period, the sampling current peak value and the input current instantaneous value;
the fifth establishing module is used for establishing a fifth equation according to the inductance value, the switching period, the forward peak value of the sampling current and the instantaneous value of the input voltage in the power factor correction circuit;
the sixth establishing module is used for establishing a sixth equation according to the inductance value, the switching period, the sampling current reverse peak value, the input voltage instantaneous value and the output voltage in the power factor correction circuit;
the seventh establishing module is used for establishing a seventh equation according to the instantaneous value of the sampling current and the forward peak value of the sampling current;
And the sixth determining module is used for determining the second mapping relation according to the fourth equation, the fifth equation, the sixth equation and the seventh equation.
In some embodiments, before correcting the duty cycle feedforward coefficient and the sampling current correction coefficient in real time according to the first mapping relationship and the second mapping relationship, further comprising:
a seventh determining module, configured to determine a relationship between a periodic average value of the inductor current and a sampling value of the inductor current;
an eighth determining module, configured to determine a sampling current correction coefficient according to a relationship between a periodic average value of the inductor current and a sampling value of the inductor current;
and a ninth determining module, configured to determine a continuous sampling current correction coefficient and an intermittent sampling current correction coefficient according to the continuous mode and the intermittent mode, respectively.
In some embodiments, determining the corresponding continuous sampling current correction coefficient and discontinuous sampling current correction coefficient according to the continuous mode and discontinuous mode, respectively, includes:
the judging module is used for judging whether the power factor correction circuit is in an intermittent mode or not;
if not, triggering a tenth determining module for determining that the continuous sampling current correction coefficient is 1;
if yes, triggering an eleventh determining module for determining the intermittent sampling current correction coefficient according to the output voltage, the intermittent duty ratio and the input voltage instantaneous value.
In some embodiments, after determining the intermittent sampling current correction coefficient according to the output voltage, the intermittent duty cycle, the input voltage transient, further comprising:
and the updating module is used for updating the intermittent sampling current correction coefficient, and the intermittent sampling current correction coefficient is smaller than 1.
Since the embodiments of the apparatus portion and the embodiments of the method portion correspond to each other, the embodiments of the apparatus portion are referred to the description of the embodiments of the method portion, and are not repeated herein.
Fig. 8 is a block diagram of a correction device based on a pfc circuit according to an embodiment of the present invention, and as shown in fig. 8, a correction device based on a pfc circuit includes:
a memory 80 for storing a computer program;
a processor 81 for implementing the steps of the correction method based on a power factor correction circuit as mentioned in the above embodiments when executing a computer program.
The correction device based on the power factor correction circuit provided in this embodiment may include, but is not limited to, a smart phone, a tablet computer, a notebook computer, a desktop computer, or the like.
Processor 81 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 81 may be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), programmable logic array (Programmable Logic Array, PLA). The processor 81 may also include a main processor, which is a processor for processing data in an awake state, also referred to as a central processor (Central Processing Unit, CPU), and a coprocessor; a coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 81 may be integrated with an image processor (Graphics Processing Unit, GPU) for taking care of rendering and drawing of the content that the display screen is required to display. In some embodiments, the processor 81 may also include an artificial intelligence (Artificial Intelligence, AI) processor for processing computing operations related to machine learning.
Memory 80 may include one or more computer-readable storage media, which may be non-transitory. Memory 80 may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In this embodiment, the memory 80 is at least used to store a computer program that, when loaded and executed by the processor 81, is capable of implementing the relevant steps of the correction method based on the pfc circuit disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 80 may also include an operating system, data, etc., and the storage manner may be transient storage or permanent storage. The operating system may include Windows, unix, linux, among others. The data may include, but is not limited to, a correction method based on a power factor correction circuit, and the like.
In some embodiments, the correction device based on the power factor correction circuit can further comprise a display screen, an input-output interface, a communication interface, a power supply and a communication bus.
It will be appreciated by those skilled in the art that the configuration shown in fig. 8 does not constitute a limitation of the power factor correction circuit-based correction device and may include more or less components than those illustrated.
The correction device based on the power factor correction circuit provided by the embodiment of the invention comprises the memory 80 and the processor 81, wherein the processor 81 can realize the correction method based on the power factor correction circuit when executing the program stored in the memory 80.
Finally, the invention also provides a corresponding embodiment of the computer readable storage medium. The computer-readable storage medium has stored thereon a computer program which, when executed by a processor, performs the steps as described in the method embodiments above.
It will be appreciated that the methods of the above embodiments, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored on a computer readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium for performing all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random-access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The correction method, the device, the equipment and the medium based on the power factor correction circuit provided by the invention are described in detail. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Claims (10)

1. A correction method based on a power factor correction circuit, characterized by being applied to a rectifier provided with a power factor correction circuit, and the rectifier being connected to an inverter, the inverter being connected to a load, the method comprising:
when various power related parameters are collected, determining the intermittent duty ratio of the power factor correction circuit in an intermittent mode;
determining a first mapping relation between the intermittent duty ratio and a continuous duty ratio of the power factor correction circuit in a continuous mode, and obtaining a duty ratio feedforward coefficient;
determining intermittent sampling current of the power factor correction circuit in the intermittent mode according to the power related parameters;
determining a second mapping relation between the intermittent sampling current and continuous intermittent sampling current of the power factor correction circuit in the continuous mode, and obtaining a sampling current correction coefficient;
and correcting the duty ratio feedforward coefficient and the sampling current correction coefficient in real time according to the first mapping relation and the second mapping relation.
2. The correction method based on a power factor correction circuit according to claim 1, wherein the power-related parameters include at least: input voltage peak value, input current peak value, input voltage instantaneous value, input current instantaneous value, input power average value, angular frequency, phase information, switching frequency, inductance and inductance current; the determining the intermittent duty cycle of the power factor correction circuit in the intermittent mode includes:
Establishing a first equation on the condition of the input current instantaneous value, the input current peak value, the angular frequency, the phase information, the switching frequency and the inductance sensing quantity, and the inductance current;
establishing a second equation on the condition of the input voltage instantaneous value, the input voltage peak value, the angular frequency, the phase information, the switching frequency and the inductance sensing quantity, and the inductance current;
establishing a third equation by using the input voltage peak value and the input current peak value;
and determining the intermittent duty ratio according to the first equation, the second equation and the third equation.
3. The correction method based on a power factor correction circuit according to claim 2, further comprising, after said determining the intermittent duty ratio according to the first equation, the second equation, and the third equation:
determining the duty cycle feedforward coefficient according to the intermittent duty cycle;
and determining the first mapping relation according to the duty ratio feedforward coefficient and the continuous duty ratio.
4. The correction method based on a power factor correction circuit according to claim 1, wherein the power-related parameters include at least: a switching period, a forward peak value of a sampling current, a reverse peak value of the sampling current, an input current instantaneous value, an inductance value in the power factor correction circuit, an input voltage instantaneous value, an output voltage and a sampling current instantaneous value; the determining a second mapping relationship between the intermittent sampling current and a continuous intermittent sampling current of the power factor correction circuit in the continuous mode includes:
Establishing a fourth equation according to the switching period, the sampling current peak value and the input current instantaneous value;
establishing a fifth equation according to the inductance value, the switching period, the forward peak value of the sampling current and the instantaneous value of the input voltage in the power factor correction circuit;
establishing a sixth equation according to the inductance value, the switching period, the sampling current reverse peak value, the input voltage instantaneous value and the output voltage in the power factor correction circuit;
establishing a seventh equation according to the sampling current instantaneous value and the sampling current forward peak value;
and determining the second mapping relation according to the fourth equation, the fifth equation, the sixth equation and the seventh equation.
5. The correction method based on a power factor correction circuit according to claim 2, further comprising, before said correcting the duty ratio feedforward coefficient and the sampling current correction coefficient in real time according to the first map and the second map:
determining the relation between the periodic average value of the inductive current and the sampling value of the inductive current;
determining the sampling current correction coefficient according to the relation between the periodic average value of the inductance current and the sampling value of the inductance current;
And respectively determining corresponding continuous sampling current correction coefficients and intermittent sampling current correction coefficients according to the continuous mode and the intermittent mode.
6. The method of correcting a power factor correction circuit according to claim 4, wherein determining the corresponding continuous sampling current correction coefficient and intermittent sampling current correction coefficient according to the continuous mode and the intermittent mode, respectively, comprises:
judging whether the power factor correction circuit is in the intermittent mode or not;
if not, determining that the continuous sampling current correction coefficient is 1;
if yes, determining the intermittent sampling current correction coefficient according to the output voltage, the intermittent duty ratio and the input voltage instantaneous value.
7. The correction method based on a power factor correction circuit according to claim 6, further comprising, after said determining said intermittent sampling current correction coefficient from said output voltage, said intermittent duty cycle, said input voltage transient value:
updating the intermittent sampling current correction coefficient, wherein the intermittent sampling current correction coefficient is smaller than 1.
8. A correction device based on a power factor correction circuit, characterized in that it is applied to a rectifier provided with a power factor correction circuit, and the rectifier is connected to an inverter, the inverter being connected to a load, the device comprising:
The first determining module is used for determining the intermittent duty ratio of the power factor correction circuit in an intermittent mode when various power related parameters are acquired;
a first determining and obtaining module, configured to determine a first mapping relationship between the intermittent duty cycle and a continuous duty cycle of the power factor correction circuit in a continuous mode, and obtain a duty cycle feedforward coefficient;
a second determining module, configured to determine, according to the power-related parameter, an intermittent sampling current of the power factor correction circuit in the intermittent mode;
a second determining and obtaining module, configured to determine a second mapping relationship between the intermittent sampling current and the continuous intermittent sampling current of the pfc circuit in the continuous mode, and obtain a sampling current correction coefficient;
and the real-time correction module is used for correcting the duty ratio feedforward coefficient and the sampling current correction coefficient in real time according to the first mapping relation and the second mapping relation.
9. A correction device based on a power factor correction circuit, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the correction method based on a power factor correction circuit as claimed in any of claims 1 to 7 when executing said computer program.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the correction method based on a power factor correction circuit according to any of claims 1 to 7.
CN202311136271.5A 2023-09-04 2023-09-04 Correction method, device, equipment and medium based on power factor correction circuit Pending CN116995912A (en)

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Application Number Priority Date Filing Date Title
CN202311136271.5A CN116995912A (en) 2023-09-04 2023-09-04 Correction method, device, equipment and medium based on power factor correction circuit

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