CN113422525A - PFC circuit control method, device, equipment and computer readable storage medium - Google Patents
PFC circuit control method, device, equipment and computer readable storage medium Download PDFInfo
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The application discloses a PFC circuit control method, a PFC circuit control device, PFC circuit control equipment and a computer readable storage medium, wherein the method comprises the following steps: acquiring an input voltage signal of a PFC circuit, and injecting a voltage harmonic component on the basis of the input voltage signal to obtain a first voltage signal; adjusting a sampling current signal of the PFC circuit according to the first voltage signal; and controlling the output power of the PFC circuit according to the adjusted sampling current signal. This application is through injecting the voltage harmonic component on the basis of the input voltage signal who acquires, adjust sampling current signal according to this first voltage signal, can reduce the ripple current in the sampling current signal, thereby reduce the ripple current of energy storage capacitor, the influence of ripple current to energy storage capacitor life has been avoided, and the charge-discharge power that has reduced the energy storage capacitor of PFC circuit is undulant, energy storage capacitor's security has been ensured, energy storage capacitor's life has been prolonged, PFC circuit's reliability has been improved.
Description
Technical Field
The present application relates to the field of switching power supply technologies, and in particular, to a method, an apparatus, a device, and a computer-readable storage medium for controlling a PFC circuit.
Background
The Power Factor (PF) is a relationship between the effective Power and the total Power consumption (apparent Power), and basically, the Power Factor can measure the degree of effective utilization of the electric Power, and when the Power Factor value is larger, it represents that the electric Power utilization rate is higher, and a Power Factor Correction (PFC) circuit can effectively solve the problem of current harmonics existing in the Power electronic equipment, and improves the utilization rate of the electric Power, so that the PF is widely applied to the switching Power supply of the variable frequency air conditioner.
Since the input power of the PFC circuit of the inverter air conditioner is ac pulsating power and the output power is dc constant power, an energy storage capacitor is usually required to balance the input power and the output power of the PFC circuit.
Through detection, the input current of the PFC circuit contains a large amount of odd harmonics, namely ripple current, and because the ripple current in the input current is also an alternating current component, dissipation can occur on the energy storage capacitor, and if the ripple current component in the input current is too large, output power fluctuation is easy to be large, so that the service life of the energy storage capacitor is greatly shortened.
Disclosure of Invention
The application provides a PFC circuit control method, a PFC circuit control device, PFC circuit control equipment and a computer readable storage medium, and aims to solve the problems that in the prior art, due to the fact that input current of a PFC circuit contains a large amount of ripple current, output power fluctuation is large, and the service life of an energy storage capacitor is influenced.
In a first aspect, the present application provides a PFC circuit control method, including:
acquiring an input voltage signal of a PFC circuit, and injecting a voltage harmonic component on the basis of the input voltage signal to obtain a first voltage signal;
adjusting a sampling current signal of the PFC circuit according to the first voltage signal;
and controlling the output power of the PFC circuit according to the adjusted sampling current signal.
In one possible implementation manner of the present application, acquiring an input voltage signal of a PFC circuit includes:
acquiring an alternating voltage signal, wherein the alternating voltage signal is a voltage signal output by an alternating voltage source electrically connected with a PFC circuit;
and obtaining an input voltage signal according to the alternating voltage signal.
In a possible implementation of the present application, the input voltage signal is a steamed bun wave voltage signal, and the input voltage signal is obtained according to the ac voltage signal, including:
and rectifying the alternating voltage signal to obtain a steamed bread wave voltage signal.
In a possible implementation manner of the present application, the voltage harmonic component is a third harmonic voltage component, and the voltage harmonic component is injected on the basis of the input voltage signal to obtain a first voltage signal, including:
obtaining a third harmonic voltage component according to the input voltage signal;
and injecting a third harmonic voltage component based on a preset proportion to the fundamental wave of the input voltage signal to obtain a first voltage signal.
In one possible implementation manner of the present application, adjusting a sampled current signal of a PFC circuit according to a first voltage signal includes:
the signal waveform of the sampling current signal is adjusted according to the signal waveform of the first voltage signal so that the signal waveform of the sampling current signal follows the signal waveform of the first voltage signal.
In one possible implementation manner of the present application, controlling the output power of the PFC circuit according to the adjusted sampling current signal includes:
performing proportional integral calculation according to the adjusted sampling current signal to obtain a control duty ratio;
obtaining a pulse width modulation signal according to the control duty ratio;
and controlling the on or off states of a transistor of the PFC circuit according to the pulse width modulation signal so as to control the output power of the PFC circuit.
In one possible implementation manner of the present application, after the harmonic component of the voltage is injected on the basis of the input voltage signal to obtain the first voltage signal, the method further includes:
and carrying out zero crossing point processing on the first voltage signal according to a preset voltage threshold value to obtain a second voltage signal so as to adjust a sampling current signal of the PFC circuit according to the second voltage signal.
In a second aspect, the present application further provides a PFC circuit control apparatus, including:
the acquisition and injection module is used for acquiring an input voltage signal of the PFC circuit and injecting a voltage harmonic component on the basis of the input voltage signal to obtain a first voltage signal;
the adjusting module is used for adjusting a sampling current signal of the PFC circuit according to the first voltage signal;
and the control output module is used for controlling the output power of the PFC circuit according to the adjusted sampling current signal.
In one possible implementation manner of the present application, the acquisition injection module is specifically configured to:
acquiring an alternating voltage signal, wherein the alternating voltage signal is a voltage signal output by an alternating voltage source electrically connected with a PFC circuit;
and obtaining an input voltage signal according to the alternating voltage signal.
In a possible implementation manner of the present application, the input voltage signal is a steamed bun wave voltage signal, and the acquisition injection module is further specifically configured to:
and rectifying the alternating voltage signal to obtain a steamed bread wave voltage signal.
In one possible implementation manner of the present application, the voltage harmonic component is a third harmonic voltage component, and the acquisition and injection module is further specifically configured to:
obtaining a third harmonic voltage component according to the input voltage signal;
and injecting a third harmonic voltage component based on a preset proportion to the fundamental wave of the input voltage signal to obtain a first voltage signal.
In one possible implementation manner of the present application, the adjusting module is specifically configured to:
the signal waveform of the sampling current signal is adjusted according to the signal waveform of the first voltage signal so that the signal waveform of the sampling current signal follows the signal waveform of the first voltage signal.
In one possible implementation manner of the present application, the control output module is specifically configured to:
performing proportional integral calculation according to the adjusted sampling current signal to obtain a control duty ratio;
obtaining a pulse width modulation signal according to the control duty ratio;
and controlling the on or off states of a transistor of the PFC circuit according to the pulse width modulation signal so as to control the output power of the PFC circuit.
In one possible implementation manner of the present application, the apparatus further includes:
a zero crossing point processing module: the zero crossing point processing module is used for carrying out zero crossing point processing on the first voltage signal according to a preset voltage threshold value to obtain a second voltage signal so as to adjust a sampling current signal of the PFC circuit according to the second voltage signal.
In a third aspect, the present application further provides a PFC circuit control device, including:
one or more processors;
a memory;
and one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the processor to implement the PFC circuit control method of the first aspect.
In a fourth aspect, the present application also provides a computer-readable storage medium, on which a computer program is stored, the computer program being loaded by a processor to execute the steps in the PFC circuit control method of the first aspect.
From the above, the present application has the following advantageous effects:
in this application, through injecting the voltage harmonic component on the basis of the input voltage signal who acquires, obtain first voltage signal, and then adjust sampling current signal according to this first voltage signal, can reduce the ripple current in the sampling current signal, thereby energy storage capacitor's ripple current has been reduced, then according to this sampling current signal control PFC circuit's output power alright in order to reduce PFC circuit's output's fluctuation, thereby can reduce PFC circuit's energy storage capacitor's charge-discharge power fluctuation, energy storage capacitor's security has been ensured, energy storage capacitor's life has been prolonged, PFC circuit's reliability has been improved.
Drawings
In order to more clearly illustrate the technical solutions in the present application, the drawings that are needed to be used in the description of the present application will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive effort.
Fig. 1 is a circuit schematic diagram of a PFC circuit provided in an embodiment of the present application;
FIG. 2 is a waveform diagram of input power and output power provided in an embodiment of the present application;
FIG. 3 is a schematic diagram of a current component obtained by Fourier analysis of an input current in an embodiment of the present application;
fig. 4 is a schematic flowchart of a PFC circuit control method provided in an embodiment of the present application;
FIG. 5 is a schematic flow chart of obtaining the first voltage signal according to the embodiment of the present application;
FIG. 6 is a schematic signal waveform diagram of a first voltage signal in an embodiment of the present application;
FIG. 7 is a schematic diagram of a model structure for adjusting a sampled current signal according to an embodiment of the present application;
fig. 8 is a schematic flow chart of controlling the output power of the PFC circuit according to the embodiment of the present application;
FIG. 9 is a signal waveform diagram of a second voltage signal in the embodiment of the present application;
fig. 10 is a schematic structural diagram of a PFC circuit control apparatus provided in an embodiment of the present application;
fig. 11 is a schematic structural diagram of a PFC circuit control device provided in an embodiment of the present application.
Detailed Description
The technical solutions in the present application will be described clearly and completely with reference to the accompanying drawings in the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not set forth in detail in order to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
Before introducing the PFC circuit control method, apparatus, device, and computer readable storage medium provided in this application, a related description is first performed on the PFC circuit mentioned in this application, as shown in fig. 1, which is a schematic circuit diagram of a PFC circuit in the prior art, and in general, main devices of a Power Factor Correction (PFC) circuit include a Microcontroller (MCU), a driving circuit, an Insulated Gate Bipolar Transistor (IGBT) Q, an inductor L, a fast recovery diode D, and an energy storage capacitor C, where the MCU is used to generate a Pulse Width Modulation (PWM) signal, the inductor L is connected to a rectifier bridge, and an Alternating voltage signal V _ AC of an Alternating Current voltage source (AC) is rectified by the rectifier bridge to obtain an input voltage signal V _ ACdbThe output is output to an inductor L, and a PFC circuit adjusts the switching state of an insulated gate bipolar transistor Q according to the generated PWM signal so as to adjust the switching state of the insulated gate bipolar transistor Q according to an input voltage signal VdbObtain an output voltage VdcThe output voltage V is obtained by improving the power factor of the electric equipment, such as a variable frequency air conditionerdcCan be used to power load terminals such as compressors and fans.
In order to improve the power utilization rate of the existing inverter air conditioner, a power circuit of the existing inverter air conditioner mostly adopts a PFC circuit to adjust the power factor, and because the input power of the PFC circuit of the inverter air conditioner is ac pulsating power and the output power is dc constant power, an energy storage capacitor is usually needed to balance the input power and the output power of the PFC circuit. For example, in a conventional variable frequency air conditioner with a 1.5P specification, 2 electrolytic capacitors of 470uF are usually arranged on an electric control board, but since the unit price of the electrolytic capacitors is expensive, and along with the improvement of a control technology and a control algorithm, 1 electrolytic capacitor is mostly adopted as an energy storage capacitor in the conventional variable frequency air conditioner to balance input and output power.
When the power factor PF is equal to 1, the input power of the PFC circuit is equal to the output power, that is, the input power on the ac side is equal to the output power on the dc side, as shown in fig. 2, which is a waveform diagram of the input power and the output power provided in the embodiment of the present application, in fig. 2, along the time axis TlineIn sine-wave pulsating transformation as input power waveform PinAlong a time axis TlineThe dotted line through the sine wave is the output power waveform PoIn the input power waveform PinAnd an output power waveform PoAbove (c), the dotted line of sine wave ripple conversion is the input voltage VinThe solid line is the input current IinSetting the output voltage to VoOutput current is IoThen, when the power factor PF is equal to 1, the following is satisfied: vin*Iin＝Po＝Vo*IoAnd due to the input voltage VinIs an alternating voltage of VinV sin (ω t), where ω is the angular velocity, and the input voltage VinIs correlated with time t, so that the input current I can be obtainedin＝Po/V*sin(ωt)。
As shown in fig. 3, which is a schematic diagram of a current component obtained by fourier analysis of the input current in the embodiment of the present application, wherein the horizontal axis represents Frequency in Hz, and the vertical axis represents amplitude Mag after fourier transform, on the premise that the fundamental Frequency is 50Hz and the highest Frequency is 5000Hz, the input current I is subjected to fourier transforminFourier analysis, as can be taken from FIG. 3, input Current IinThe capacitor contains a large amount of odd harmonics which are also alternating current components, so that the output power fluctuation is easy to be large, the internal heat of the energy storage capacitor is serious, the dissipation occurs, and the service life of the energy storage capacitor is shortened.
Based on the above analysis, in order to protect the energy storage capacitor in the PFC circuit, the present application provides a PFC circuit control method, apparatus, device and computer readable storage medium, which are respectively described in detail below.
First, the present application provides a PFC circuit control method, which is applied to a controller, and an execution main body of the PFC circuit control method is a PFC circuit control device, and the PFC circuit control method includes: acquiring an input voltage signal of a PFC circuit, and injecting a voltage harmonic component on the basis of the input voltage signal to obtain a first voltage signal; adjusting a sampling current signal of the PFC circuit according to the first voltage signal; and controlling the output power of the PFC circuit according to the adjusted sampling current signal.
Fig. 4 is a schematic flow chart of a PFC circuit control method provided in this embodiment of the present application. It should be noted that while a logical order is shown in the flow diagram, in some cases, the steps shown or described may be performed in an order different than presented herein. The PFC circuit control method comprises the following steps:
s401, an input voltage signal of the PFC circuit is obtained, and a voltage harmonic component is injected on the basis of the input voltage signal to obtain a first voltage signal.
In the embodiment of the application, an input voltage signal of the PFC circuit may be obtained by any existing sampling method, for example, voltage sampling, current mutual inductance sampling, resistance sampling, and the like, and the input voltage signal may be used to represent a voltage at a connection point of an inductor and a power supply terminal of the PFC circuit.
The voltage harmonic component injected into the input voltage signal may be obtained based on the input voltage signal, wherein the initial phase of the voltage harmonic component may be the same as the initial phase of the fundamental wave of the input voltage signal, that is, the voltage harmonic component is injected into the input voltage signal, which may be understood as superimposing the voltage harmonic component on the input voltage signal in the time domain, and since an odd harmonic exists in the input voltage signal, after the voltage harmonic component is superimposed in the input voltage signal, the initial phase of the voltage harmonic component is the same as the initial phase of the fundamental wave of the input voltage signal, when the input voltage signal is combined with the line voltage, the odd harmonic of the input voltage signal is cancelled with the voltage harmonic component, and thus, after the input voltage signal is injected into the voltage harmonic component, the content of the odd harmonic in the obtained first voltage signal is correspondingly reduced, i.e. the ripple current in the first voltage signal is reduced.
S402, adjusting a sampling current signal of the PFC circuit according to the first voltage signal.
Because the output voltage finally output by the PFC circuit is used for supplying power to the load terminal, in order to ensure that power can be stably supplied to the load terminal, the state control of the transistor in the PFC circuit needs to be performed, and the state control of the transistor can be realized through the sampling current signal, and because the ripple current in the first voltage signal is reduced, the ripple current of the sampling current signal of the PFC circuit is correspondingly reduced.
And S403, controlling the output power of the PFC circuit according to the adjusted sampling current signal.
In the embodiment of the application, the on-off or on-off state of the transistor can be converted by sampling the current signal to control the state of the transistor, the output voltage of the PFC circuit can be stably output by changing the on-time of the transistor, and then the power supply for a load end is ensured to be stable, namely, the stability of the output power of the PFC circuit is ensured, the fluctuation of the output power is reduced, the power fluctuation of the energy storage capacitor in the charging and discharging processes is correspondingly reduced, and the stable work of the energy storage capacitor is ensured.
In the embodiment of the application, through injecting the voltage harmonic component on the basis of the input voltage signal who obtains, obtain first voltage signal, and then adjust the sampling current signal according to this first voltage signal, can reduce the ripple current in the sampling current signal, thereby energy storage capacitor's ripple current has been reduced, then according to this sampling current signal control PFC circuit's output power alright reduce PFC circuit's output power's fluctuation again, thereby can reduce PFC circuit's energy storage capacitor's charge-discharge power fluctuation, energy storage capacitor's security has been ensured, energy storage capacitor's life has been prolonged, PFC circuit's reliability has been improved.
In some embodiments of the present application, obtaining the input voltage signal of the PFC circuit may further include: acquiring an alternating voltage signal, wherein the alternating voltage signal is a voltage signal output by an alternating voltage source electrically connected with a PFC circuit; and obtaining an input voltage signal according to the alternating voltage signal.
Specifically, referring to fig. 1, in the embodiment of the present application, the alternating voltage signal is a voltage signal V _ AC output by an alternating voltage source AC, a waveform of the alternating voltage signal is a sine wave, and since electronic devices of the PFC circuit, such as a microcontroller MCU, a driving circuit, and an insulated gate bipolar transistor Q, all operate in a direct current environment, in this embodiment, the input voltage signal is obtained according to the alternating voltage signal, and the input voltage signal V _ AC may be obtained by rectifying the alternating voltage signal by a rectifying device, such as a rectifier bridge and a rectifier, to obtain the input voltage signal V _ ACdbAnd the obtained input voltage signal VdbCan be a steamed bread wave voltage signal, i.e. input voltage signal VdbThe waveform of the input voltage signal V _ ac can be a steamed bread waveform obtained by turning over a sine-shaped alternating voltage signal V _ ac in an upward symmetrical manner at a part with a negative amplitude by taking a time axis as a symmetrical axis, so that the input voltage signal V _ ac is inputdbAre all positive values.
As shown in fig. 5, which is a schematic flow chart of obtaining the first voltage signal in the embodiment of the present application, in some embodiments of the present application, the voltage harmonic component may be a third harmonic voltage component, and the voltage harmonic component is injected on the basis of the input voltage signal to obtain the first voltage signal, and the method may further include:
and S501, obtaining a third harmonic voltage component according to the input voltage signal.
According to the above embodiment, the voltage signal V is inputdbFor the rectified AC voltage signal V _ ac, V is assumed to have an initial phase of 0 DEGdbV x | sin (ω t) |, input voltage signal VdbThe corresponding third harmonic voltage component may then be Vdb' V X | sin (3 ω t) |, and sin (3 ω t) ═ 3sin (ω t) -4sin (ω t) between the third harmonic component and the fundamental wave3Therefore, in the present embodiment, the third harmonic voltage component Vdb' may be expressed as:
Vdb’＝3*V*sin(ωt)-4*(V*sin(ωt))3/V2
s502, injecting third harmonic voltage components based on a preset proportion into fundamental waves of the input voltage signals to obtain first voltage signals.
According to the third harmonic voltage component V in S501dbThe equation of can be real-time based on the input voltage signal VdbSpecifically, as shown in fig. 6, the obtained third harmonic voltage component is injected to the fundamental wave of the input voltage signal according to a preset ratio, where the uppermost steamed bread wave is the fundamental wave of the input voltage signal, the lowermost saddle wave is the waveform of the first voltage signal, and the middle saddle wave is the waveform of the third harmonic voltage component, in this embodiment, the value of the preset ratio is set to be 0.2, that is, the third harmonic voltage component is injected to the fundamental wave of the input voltage signal according to the injection ratio of 0.2.
In some embodiments of the present application, the adjusting the sampling current signal of the PFC circuit according to the first voltage signal may specifically be: the signal waveform of the sampling current signal is adjusted according to the signal waveform of the first voltage signal so that the signal waveform of the sampling current signal follows the signal waveform of the first voltage signal.
Referring to fig. 7, fig. 7 is a schematic diagram of a model structure for adjusting a sampling current signal in an embodiment of the present application, in the embodiment of the present application, a PFC circuit implements adjustment for controlling a duty ratio through a voltage loop and a current loop, so that a loop current of the PFC circuit follows a voltage, the voltage loop is used to ensure an output voltage, and may also be understood as a subsequent bus voltage, and the current loop is used to ensure that an input current waveform of the PFC circuit is consistent with an input voltage waveform, specifically, VrefIs a reference voltage, VfdbPI is proportional-integral controller (proportionality) for feedback voltage of PFC circuitI integral controller, PI), K is the preset proportion of the injected third harmonic voltage component, the aim of satisfying PF value and reducing power fluctuation can be achieved by adjusting the size of K, wherein, the PI controller is a linear controller which can form control deviation according to the given value and the actual output value, the proportion and integral of the deviation form control quantity by linear combination, the controlled object is controlled, concretely, the reference voltage VrefAnd a feedback voltage VfdbAfter being regulated by the first PI controller PI1, an output signal of a current loop is obtained, and the output signal of the current loop and an input voltage signal V injected with a third harmonic voltage component are obtaineddbThat is, the first voltage signal is multiplied by the multiplier, and the product obtained after multiplication is used as the given value of the current loop, that is, the sampling current signal I can be adjusted according to the signal waveform of the product signaldbSo as to sample the current signal IdbThe signal waveform of the sampling current signal is adjusted by following the signal waveform of the product signal.
As shown in fig. 8, which is a schematic flow chart of controlling the output power of the PFC circuit in the embodiment of the present application, specifically, controlling the output power of the PFC circuit according to the adjusted sampling current signal may further include:
s801, carrying out proportional integral calculation according to the adjusted sampling current signal to obtain a control duty ratio;
s802, obtaining a pulse width modulation signal according to the control duty ratio;
and S803, controlling the on or off states of the transistor of the PFC circuit according to the pulse width modulation signal so as to control the output power of the PFC circuit.
With continued reference to FIG. 7, the sampled current signal I is processed in the above-described embodimentdbAfter the adjustment, in this embodiment, the adjusted sampling circuit signal may be subjected to proportional-integral calculation and adjustment according to the second PI controller PI2 to generate a control duty ratio D for controlling a Pulse Width Modulation (PWM) module, a PWM signal of the PWM module, that is, a Pulse Width modulation signal, may be obtained according to the control duty ratio D, and the transistor may be adjusted according to the Pulse Width modulation signalFor example, the on-off state of the igbt Q shown in fig. 1 is controlled, so as to control the charging and discharging of the energy storage capacitor, thereby achieving the purpose of controlling the output power of the PFC circuit.
In the charging process of the energy storage capacitor, the insulated gate bipolar transistor Q is closed and conducted, the insulated gate bipolar transistor Q is equivalent to a conducting wire, and the energy storage capacitor C is short-circuited. At this time, the voltage signal V is inputdbFlowing through the inductor L, the fast recovery diode D serves to prevent the energy storage capacitor C from discharging to ground. Since the input is a direct current, the current in the inductor L increases linearly at a rate that is related to the magnitude of the inductance of the inductor L. As the inductor L current increases, some energy is stored in the inductor L. In the discharging process, the insulated gate bipolar transistor Q is turned off, and due to the current holding characteristic of the inductor L, the current flowing through the inductor L does not immediately become 0, but slowly changes from the value at the time of completion of charging to 0. And because the insulated gate bipolar transistor Q is disconnected, the energy storage capacitor C is not short-circuited any more, so that the inductor L starts to charge the energy storage capacitor C, the voltage at two ends of the energy storage capacitor C is increased, and the voltage is higher than the input voltage signal V at the momentdbTherefore, a boosting process is completed, namely, the power utilization rate is improved. In addition, the charging time of the energy storage capacitor C can be adjusted by adjusting the control duty ratio of the insulated gate bipolar transistor Q, the longer the charging time is, the larger the bus voltage is, and conversely, the shorter the charging time is, the smaller the bus voltage is, therefore, in the scene of the embodiment of the application, the charging time of the energy storage capacitor C can be prolonged by increasing the control duty ratio, the bus voltage is further increased, the power factor PF value is improved, and the input voltage signal V is reduceddbThe ripple current in the power converter can reduce the power fluctuation of charging and discharging of the energy storage capacitor C, and the PF value can be met and the power fluctuation can be reduced.
As shown in fig. 9, which is a signal waveform diagram of the second voltage signal in the embodiment of the present application, in some embodiments of the present application, after the harmonic component of the voltage is injected on the basis of the input voltage signal to obtain the first voltage signal, the method may further include: and carrying out zero crossing point processing on the first voltage signal according to a preset voltage threshold value to obtain a second voltage signal so as to adjust a sampling current signal of the PFC circuit according to the second voltage signal. In particular, since there may be a delay in sampling the input voltage signal, the first voltage signal may experience short-term offset at the zero crossing point, thereby affecting the current harmonics, and therefore, embodiments of the present application, after obtaining the first voltage signal, the first voltage signal may be subjected to zero crossing point processing, in this embodiment, a preset voltage threshold is set to be 0.05, i.e., when the voltage per unit value of the first voltage signal is <0.05, the voltage per unit value at that point is modified to be 0.05, i.e. 0.05 instead of 0, is taken as the minimum value, in fig. 9, the waveform of the first voltage signal without zero-crossing processing is above, the waveform of the second voltage signal with zero-crossing processing is below, therefore, the accuracy of the second voltage signal can be ensured, and the sampling current signal of the PFC circuit is adjusted according to the second voltage signal, so that the reliability of the PFC circuit can be further improved.
In order to verify the effect of the present application, a 1-time comparison experiment is also performed, wherein a preset proportion of injecting a third harmonic voltage component is set to 0, that is, the third harmonic voltage component is not injected into the input voltage signal, at this time, an obtained power factor PF is 0.994, it is detected that ripple current of the energy storage capacitor is 6.5A, and bus voltage of the PFC circuit is 368V to 392V; then, the preset proportion of the injected third harmonic voltage component is set to be 0.24, at the moment, the obtained power factor PF is 0.967, the ripple current of the energy storage capacitor is detected to be 6.18A, and the bus voltage of the PFC circuit is 365V-389V; according to a contrast test, after a third harmonic voltage component is injected into an input voltage signal, the ripple current of the energy storage capacitor is reduced by 5.076%, and the ripple voltage of the energy storage capacitor is reduced by 1.58%.
In order to better implement the PFC circuit control method in the present application, the present application further provides a PFC circuit control device, as shown in fig. 10, which is a schematic structural diagram of the PFC circuit control device provided in the embodiment of the present application, and the PFC circuit control device 1000 includes:
an acquisition injection module 1001, configured to acquire an input voltage signal of the PFC circuit, and inject a voltage harmonic component based on the input voltage signal to obtain a first voltage signal;
the adjusting module 1002 is configured to adjust a sampling current signal of the PFC circuit according to the first voltage signal;
and a control output module 1003, configured to control output power of the PFC circuit according to the adjusted sampling current signal.
In the embodiment of the application, through obtaining the injection module 1001 and injecting the voltage harmonic component on the basis of the input voltage signal who obtains, obtain first voltage signal, and then adjusting module 1002 adjusts sampling current signal according to this first voltage signal, can reduce the ripple current in the sampling current signal, thereby energy storage capacitor's ripple current has been reduced, then control output module 1003 again according to this sampling current signal control PFC circuit's output power alright reduce PFC circuit's output power's fluctuation, thereby can reduce PFC circuit's energy storage capacitor's charge-discharge power fluctuation, energy storage capacitor's security has been ensured, energy storage capacitor's life has been prolonged, PFC circuit's reliability has been improved.
In some embodiments of the present application, the acquisition injection module 1001 may be specifically configured to:
acquiring an alternating voltage signal, wherein the alternating voltage signal is a voltage signal output by an alternating voltage source electrically connected with a PFC circuit;
and obtaining an input voltage signal according to the alternating voltage signal.
In some embodiments of the present application, the input voltage signal is a steamed bun wave voltage signal, and the obtaining and injecting module 1001 may be further configured to:
and rectifying the alternating voltage signal to obtain a steamed bread wave voltage signal.
In some embodiments of the present application, the voltage harmonic component is a third harmonic voltage component, and the obtaining and injecting module 1001 may further be specifically configured to:
obtaining a third harmonic voltage component according to the input voltage signal;
and injecting a third harmonic voltage component based on a preset proportion to the fundamental wave of the input voltage signal to obtain a first voltage signal.
In some embodiments of the present application, the adjusting module 1002 may be specifically configured to:
the signal waveform of the sampling current signal is adjusted according to the signal waveform of the first voltage signal so that the signal waveform of the sampling current signal follows the signal waveform of the first voltage signal.
In some embodiments of the present application, the control output module 1003 may specifically be configured to:
performing proportional integral calculation according to the adjusted sampling current signal to obtain a control duty ratio;
obtaining a pulse width modulation signal according to the control duty ratio;
and controlling the on or off states of a transistor of the PFC circuit according to the pulse width modulation signal so as to control the output power of the PFC circuit.
In some embodiments of the present application, the PFC circuit control apparatus may further include:
the zero crossing point processing module 1004 is configured to perform zero crossing point processing on the first voltage signal according to a preset voltage threshold to obtain a second voltage signal, so that the sampling current signal of the PFC circuit is adjusted according to the second voltage signal.
It should be noted that, in the present application, the relevant contents of the obtaining injection module 1001, the adjusting module 1002, the control output module 1003 and the zero-crossing point processing module 1004 correspond to the above one to one, and it can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the detailed working process of the PFC circuit control apparatus and the corresponding modules thereof described above may refer to the description of the PFC circuit control method in any embodiment corresponding to fig. 1 to fig. 9, and details are not repeated herein.
In order to better implement the PFC circuit control method of the present application, on the basis of the PFC circuit control method, the present application further provides a PFC circuit control device that integrates any one of the PFC circuit control apparatuses provided by the present application, the PFC circuit control device including:
one or more processors 1101;
a memory 1102;
and one or more application programs, wherein the one or more application programs are stored in the memory 1102 and configured to be executed by the processor 1101 for performing the steps of the PFC circuit control method of any one of the embodiments of the PFC circuit control method described above.
As shown in fig. 11, a schematic structural diagram of a PFC circuit control device according to an embodiment of the present application is shown, specifically:
the device may include components such as a processor 1101 of one or more processing cores, memory 1102 of one or more computer-readable storage media, a power supply 1103, and an input unit 1104. Those skilled in the art will appreciate that the configuration of the device shown in fig. 11 does not constitute a limitation of the device and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components. Wherein:
the processor 1101 is a control center of the apparatus, connects various parts of the entire apparatus using various interfaces and lines, performs various functions of the apparatus and processes data by running or executing software programs and/or modules stored in the memory 1102 and calling data stored in the memory 1102, thereby performing overall monitoring of the apparatus. Optionally, processor 1101 may include one or more processing cores; the Processor 1101 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, preferably the processor 1101 may integrate an application processor, which handles primarily the operating system, user interfaces, application programs, etc., and a modem processor, which handles primarily wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 1101.
The memory 1102 may be used to store software programs and modules, and the processor 1101 executes various functional applications and data processing by operating the software programs and modules stored in the memory 1102. The memory 1102 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to use of the device, and the like. Further, the memory 1102 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. Accordingly, the memory 1102 may also include a memory controller to provide the processor 1101 with access to the memory 1102.
The device further includes a power supply 1103 for supplying power to the various components, and preferably, the power supply 1103 is logically connected to the processor 1101 via a power management system, so that functions of managing charging, discharging, and power consumption are implemented via the power management system. The power supply 1103 may also include any component including one or more DC or AC voltage sources, recharging systems, power failure detection circuitry, power converters or inverters, power status indicators, and the like.
The device may further include an input unit 1104 and an output unit 1105, the input unit 1104 being operable to receive input numeric or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.
Although not shown, the apparatus may further include a display unit and the like, which will not be described in detail herein. Specifically, in the present application, the processor 1101 of the device loads the executable file corresponding to the process of one or more application programs into the memory 1102 according to the following instructions, and the processor 1101 runs the application programs stored in the memory 1102, thereby implementing various functions as follows:
acquiring an input voltage signal of a PFC circuit, and injecting a voltage harmonic component on the basis of the input voltage signal to obtain a first voltage signal;
adjusting a sampling current signal of the PFC circuit according to the first voltage signal;
and controlling the output power of the PFC circuit according to the adjusted sampling current signal.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be performed by instructions or by instructions controlling associated hardware, and the instructions may be stored in a computer readable storage medium and loaded and executed by a processor.
To this end, the present application provides a computer-readable storage medium, which may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like. Stored thereon, a computer program is loaded by a processor to execute the steps of any of the PFC circuit control methods provided herein. For example, the computer program may be loaded by a processor to perform the steps of:
acquiring an input voltage signal of a PFC circuit, and injecting a voltage harmonic component on the basis of the input voltage signal to obtain a first voltage signal;
adjusting a sampling current signal of the PFC circuit according to the first voltage signal;
and controlling the output power of the PFC circuit according to the adjusted sampling current signal.
Since the instructions stored in the computer-readable storage medium can execute the steps in the PFC circuit control method according to any embodiment of the present application corresponding to fig. 1 to 9, the beneficial effects that can be achieved by the PFC circuit control method according to any embodiment of the present application corresponding to fig. 1 to 9 can be achieved, for details, see the foregoing description, and are not repeated herein.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed descriptions of other embodiments, and are not described herein again.
In a specific implementation, each unit or structure may be implemented as an independent entity, or may be combined arbitrarily to be implemented as one or several entities, and the specific implementation of each unit or structure may refer to the foregoing embodiments, which are not described herein again.
The PFC circuit control method, apparatus, device and computer readable storage medium provided by the present application are described in detail above, and specific examples are applied herein to illustrate the principles and embodiments of the present application, and the above description is only used to help understand the method and core ideas of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A PFC circuit control method, the method comprising:
acquiring an input voltage signal of a PFC circuit, and injecting a voltage harmonic component on the basis of the input voltage signal to obtain a first voltage signal;
adjusting a sampling current signal of the PFC circuit according to the first voltage signal;
and controlling the output power of the PFC circuit according to the adjusted sampling current signal.
2. The method of claim 1, wherein the obtaining the input voltage signal of the PFC circuit comprises:
acquiring an alternating voltage signal, wherein the alternating voltage signal is a voltage signal output by an alternating voltage source electrically connected with the PFC circuit;
and obtaining the input voltage signal according to the alternating voltage signal.
3. The method of claim 2, wherein the input voltage signal is a steamed bread wave voltage signal, and wherein deriving the input voltage signal from the ac voltage signal comprises:
and rectifying the alternating voltage signal to obtain the steamed bread wave voltage signal.
4. The method of claim 1, wherein the voltage harmonic component is a third harmonic voltage component, and wherein injecting the voltage harmonic component based on the input voltage signal to obtain a first voltage signal comprises:
obtaining the third harmonic voltage component according to the input voltage signal;
and injecting the third harmonic voltage component based on a preset proportion into the fundamental wave of the input voltage signal to obtain the first voltage signal.
5. The method of claim 1, wherein the adjusting the sampled current signal of the PFC circuit based on the first voltage signal comprises:
and adjusting the signal waveform of the sampling current signal according to the signal waveform of the first voltage signal, so that the signal waveform of the sampling current signal follows the signal waveform of the first voltage signal.
6. The method of claim 1, wherein the controlling the output power of the PFC circuit according to the adjusted sampled current signal comprises:
performing proportional integral calculation according to the adjusted sampling current signal to obtain a control duty ratio;
obtaining a pulse width modulation signal according to the control duty ratio;
and controlling the on or off states of a transistor of the PFC circuit according to the pulse width modulation signal so as to control the output power of the PFC circuit.
7. The method of claim 1, wherein after injecting the harmonic component of the voltage on the basis of the input voltage signal to obtain the first voltage signal, the method further comprises:
and carrying out zero crossing point processing on the first voltage signal according to a preset voltage threshold value to obtain a second voltage signal, so that a sampling current signal of the PFC circuit is adjusted according to the second voltage signal.
8. A PFC circuit control apparatus, the apparatus comprising:
the acquisition and injection module is used for acquiring an input voltage signal of the PFC circuit and injecting a voltage harmonic component on the basis of the input voltage signal to obtain a first voltage signal;
the adjusting module is used for adjusting a sampling current signal of the PFC circuit according to the first voltage signal;
and the control output module is used for controlling the output power of the PFC circuit according to the adjusted sampling current signal.
9. A PFC circuit control device, the device comprising:
one or more processors;
a memory;
and one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement the PFC circuit control method of any of claims 1 to 7.
10. A computer-readable storage medium, having stored thereon a computer program which is loaded by a processor to execute the steps in the PFC circuit control method according to any one of claims 1 to 7.
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