CN111614247B - DCM control method and circuit of PFC converter and rectifier - Google Patents

DCM control method and circuit of PFC converter and rectifier Download PDF

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CN111614247B
CN111614247B CN202010223177.3A CN202010223177A CN111614247B CN 111614247 B CN111614247 B CN 111614247B CN 202010223177 A CN202010223177 A CN 202010223177A CN 111614247 B CN111614247 B CN 111614247B
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pfc converter
dcm
current
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CN111614247A (en
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周扬
谢永刚
孔令涛
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Shenzhen Xinyi New Energy Technology Co ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/42Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208Arrangements for improving power factor of AC input
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/42Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208Arrangements for improving power factor of AC input
    • H02M1/4225Arrangements for improving power factor of AC input using a non-isolated boost converter
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention belongs to the technical field of PFC converters, and provides a DCM control method and circuit of a PFC converter and a rectifier. The embodiment of the invention provides a DCM control method of a PFC converter, and the method comprises the steps of obtaining a first average inductive current of the PFC converter in a DCM mode in a switching period; acquiring a proportionality coefficient between the first average inductive current and a second average inductive current of the PFC converter in a switching period in a CCM mode; obtaining a product of a sampling current value of the PFC converter and the proportionality coefficient to obtain a current feedback control value; and performing feedback control on the PFC converter according to the current feedback control value, so that the PF value of the PFC converter can be obviously improved, the input current harmonic can be reduced, and the PF value and the input current harmonic in the range from the output voltage range, the voltage no-load range to the full-load range of the PFC converter can be obviously improved.

Description

DCM control method and circuit of PFC converter and rectifier
Technical Field
The invention belongs to the technical field of PFC converters, and particularly relates to a DCM control method and circuit of a PFC converter and a rectifier.
Background
A PFC (Power Factor Correction) converter is a Power Factor Correction circuit commonly used in a rectifier, and can generally operate in three modes, i.e., a CCM (continuous current mode), a CRM (critical current mode), and a DCM (discontinuous current mode). Because the PFC converter has the advantages of zero current switching-on of the electronic switching tube, no reverse recovery of the diode, fixed frequency of the electronic switching tube, simplicity in control, low cost and the like in the DCM mode, the PFC converter is widely applied to medium and low voltage Power occasions, but has the problems of high harmonic content, low PF (Power Factor) value and the like.
Disclosure of Invention
The invention aims to provide a DCM control method, a circuit and a rectifier of a PFC converter, and aims to solve the problems that the existing PFC converter is high in harmonic content and low in PF value in a DCM mode.
The first aspect of the embodiment of the invention provides a DCM control method for a PFC converter, including:
acquiring a first average inductive current of a PFC converter in a DCM mode in a switching period;
acquiring a proportionality coefficient between the first average inductive current and a second average inductive current of the PFC converter in a switching period in a CCM mode;
obtaining a product of a sampling current value of the PFC converter and the proportionality coefficient to obtain a current feedback control value;
and performing feedback control on the PFC converter according to the current feedback control value.
A second aspect of an embodiment of the present invention provides a DCM control circuit, including a memory, a processor and a computer program stored in the memory and executable on the processor, the processor being configured to be electrically connected to the PFC converter and when executing the computer program to implement the steps of the DCM control method for the PFC converter according to the first aspect of an embodiment of the present invention.
A third aspect of embodiments of the present invention provides a rectifier comprising a rectifier circuit, a PFC converter and the DCM control circuit of the second aspect of embodiments of the present invention, the PFC converter being electrically connected with the rectifier circuit and the DCM control circuit.
A fourth aspect of embodiments of the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the PFC converter DCM control method according to the first aspect of embodiments of the present invention.
The embodiment of the invention provides a DCM control method of a PFC converter, and the method comprises the steps of obtaining a first average inductive current of the PFC converter in a DCM mode in a switching period; acquiring a proportionality coefficient between the first average inductive current and a second average inductive current of the PFC converter in a switching period in a CCM mode; obtaining a product of a sampling current value of the PFC converter and the proportionality coefficient to obtain a current feedback control value; and performing feedback control on the PFC converter according to the current feedback control value, so that the PF value of the PFC converter can be obviously improved, the input current harmonic can be reduced, and the PF value and the input current harmonic in the range from the output voltage range, the voltage no-load range to the full-load range of the PFC converter can be obviously improved.
Drawings
Fig. 1 is a schematic flowchart of a DCM control method for a PFC converter according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a DCM control method for a PFC converter according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a PFC converter according to an embodiment of the present invention;
fig. 4 is a schematic diagram of driving waveforms of a PFC converter according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of a DCM control method for a PFC converter according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a fourth flowchart of a DCM control method for a PFC converter according to an embodiment of the present invention;
FIG. 7 is a waveform diagram of a first average inductor current according to an embodiment of the present invention;
fig. 8 is a fifth flowchart illustrating a DCM control method for a PFC converter according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of simulated waveforms of input current and inductor current provided by an embodiment of the present invention;
FIG. 10 is a schematic diagram of simulated waveforms of input current and grid voltage provided by an embodiment of the present invention;
FIG. 11 is a schematic diagram of a DCM control circuit according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a rectifier according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
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 of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Embodiments of the present invention provide a DCM control method for a PFC converter, which may be performed by a processor of a DCM control circuit electrically connected to the PFC converter.
In an application, the PFC converter may be a Boost (Boost) PFC converter, a bridgeless Boost PFC converter, or the like. The Processor 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. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The processor may specifically be a PWM (Pulse width modulation) processor.
In application, the DCM control circuit may further include a voltage sampling device, a current sampling device, and the like electrically connected to the PFC converter and the processor.
As shown in fig. 1, a method for controlling a DCM of a PFC converter according to an embodiment of the present invention includes:
step S101, obtaining a first average inductance current of the PFC converter in a DCM mode in a switching period.
In application, the first average inductor current may be obtained by sampling parameters, such as an inductor current, an input voltage, and an output voltage, of the PFC converter through the voltage sampling circuit and the current sampling circuit by the processor of the DCM control circuit, and then calculating according to the parameters.
As shown in fig. 2, in one embodiment, step S101 includes:
step S201, obtaining an inductive current peak value of the PFC converter;
step S202, obtaining the first average inductive current according to the inductive current peak value, the switching period and the on-time and off-time of the electronic switching tube of the PFC converter in one switching period.
In application, the processor of the DCM control circuit may sample an inductor current in one switching period of an electronic switching tube of the PFC converter through the current sampling circuit, and then obtain an inductor peak current according to the inductor current in one switching period.
In one embodiment, the expression of step S202 is:
Figure BDA0002426790010000041
wherein, IavgDCMIs the first average inductor current iLb_pkPeak value of inductor current, tyIs the on-time, tRFor the off-time, Ts_pwmIs a switching cycle.
As shown in fig. 3, an exemplary output is a circuit schematic of a PFC converter; wherein the PFC converter comprises an inductor LbElectronic switch tube QbDiode DbCapacitor CoAnd a resistor RLdElectronic switching tube QbIs an N-channel enhanced field effect transistor, an inductor LbOne end of the diode D is electrically connected with the positive output end of the full-bridge diode rectification circuit BR, and the other end of the diode DbPositive electrode of (2) and electronic switching tube QbIs electrically connected with the drain electrode of the electronic switch tube QbIs electrically connected with the negative output end of the full-bridge diode rectification circuit BR, and a capacitor CoAnd a resistor RLdConnected in parallel to the electronic switch tube QbDrain electrode of and diode DbThe input end of the full-bridge diode rectification circuit BR is connected with an alternating current power supply between the negative electrodes of the two diodes.
In application, the ac Power source may be a commercial Power grid or a Power frequency ac Power grid, or may be any electronic Power device capable of outputting an ac electrical signal, such as a UPS (uninterruptible Power Supply), a frequency converter, a photovoltaic inverter, an energy storage converter, an electric vehicle driver, and the like.
As shown in fig. 4, a schematic diagram illustrating a driving waveform of the PFC converter shown in fig. 3 is exemplary.
Referring to the waveform diagram shown in fig. 4, as shown in fig. 5, in an embodiment, before step S202, the method includes:
and S501, when the electronic switching tube is conducted, obtaining the conducting time of the electronic switching tube in a switching period according to the inductive current peak value and the input voltage and the inductance of the PFC converter.
In one embodiment, the expression of step S501 is:
Figure BDA0002426790010000051
vg is input voltage, Lb is inductance, iLb_pkPeak value of inductor current, tyIs the on time.
And S502, when the electronic switching tube is turned off, obtaining the turn-off time of the electronic switching tube in a switching period according to the inductive current peak value and the input voltage, the output voltage and the inductance of the PFC converter.
In one embodiment, the expression of step S502 is:
Figure BDA0002426790010000052
where Vc is the output voltage, Vg is the input voltage, Lb is the inductance, iLb_pkPeak value of inductor current, tRThe off time.
Step S503, acquiring a switching period according to the duty ratio and the on time when the electronic switching tube is switched on, or according to the duty ratio and the off time when the electronic switching tube is switched off.
ty=DyTs _ pwm; (formula four)
tR=DRTs _ pwm; (formula five)
Wherein,tyis the on-time, tRFor the off-time, DRDuty ratio when the electronic switching tube is turned off, DyIs the duty ratio of the electronic switching tube when it is conducted, Ts_pwmIs a switching cycle.
As shown in fig. 6, in one embodiment, step S101 includes:
step S601, obtaining the first average inductive current according to the inductive current peak value, the input voltage and the output voltage of the PFC converter and the duty ratio of the electronic switching tube of the PFC converter during conduction.
In one embodiment, the expression of step S501 is:
Figure BDA0002426790010000061
wherein, IavgDCMIs the first average inductor current iLb_pkIs the peak value of the inductor current, DyAnd Vg is the input voltage and Vc is the output voltage for the duty ratio when the electronic switching tube is conducted.
In application, a formula two, a formula three, a formula four and a formula five are substituted into a formula one to obtain a formula six, so that the inductor current can be sampled by a processor of the DCM control circuit through a current sampling circuit to obtain an inductor current peak value, the input voltage and the output voltage are sampled through a voltage sampling circuit, and the first average inductor current is calculated by substituting the formula six in combination with the known duty ratio of the PFC converter when an electronic switching tube is conducted.
And step S102, obtaining a proportionality coefficient between the first average inductive current and a second average inductive current of the PFC converter in a switching period in a CCM mode.
In one embodiment, the expression for the second average inductor current of the PFC converter in a switching cycle in CCM mode is:
IavgCCM=0.5*iLb_pk(ii) a (formula seven)
Wherein, IavgCCMIs the second average inductor current iLb_pkIs inductance peak powerAnd (4) streaming.
In application, the formula seven is substituted into the formula six, and the relational expression between the first average inductive current and the second average inductive current can be obtained.
In one embodiment, the relationship between the first average inductor current and the second average inductor current is:
Figure BDA0002426790010000071
wherein, IavgDCMIs the first average inductor current, IavgCCMIs the second average inductor current iLb_pkIs the peak value of the inductor current, DyAnd Vg is the input voltage and Vc is the output voltage for the duty ratio when the electronic switching tube is conducted.
As shown in fig. 7, a waveform diagram of the first average inductor current obtained based on equation eight is exemplarily shown; wherein iLbFor input current, the sampled current value is the midpoint value of the rising edge of the current, iLb_avIs the first average inductor current iLb_pkThe peak inductor current value.
In application, the proportionality coefficient between the first average inductive current and the second average inductive current can be obtained according to a relation between the first average inductive current and the second average inductive current, namely formula eight
In one embodiment, the expression of step S102 is:
Figure BDA0002426790010000072
wherein, KDCM/CCMIavg being a scale factorDCMIs the first average inductor current, IavgCCMIs the second average inductor current iLb_pkIs the peak value of the inductor current, DyAnd Vg is the input voltage and Vc is the output voltage for the duty ratio when the electronic switching tube is conducted.
And step S103, obtaining a product of the sampling current value of the PFC converter and the proportionality coefficient to obtain a current feedback control value.
In application, the sampled current value is a sampled current value of the output current of the PFC converter. The current feedback control value can be obtained by sampling through a current sampling circuit by a processor of the DCM control circuit, and then calculating the product of the sampling current value and the proportionality coefficient through a multiplier to obtain the current feedback control value.
And step S104, performing feedback control on the PFC converter according to the current feedback control value.
In application, the processor of the DCM control circuit drives and controls the grid electrode of an electronic switching tube of the PFC converter according to the current feedback control value.
As shown in fig. 8, in an embodiment, after step S104, the method further includes:
step S801, obtaining a product of a feed-forward value of the PFC converter in a CCM mode and the proportionality coefficient to obtain a feed-forward control value.
In application, the feedforward value is a duty ratio of an input voltage of the PFC converter in a CCM mode. The feedforward control value may be obtained by the processor of the DCM control circuit by calculating the product of a known feedforward value and the scaling factor by a multiplier.
In one embodiment, the feed forward value of the PFC converter in CCM mode is expressed as follows:
Figure BDA0002426790010000081
wherein, D is the feedforward value in the CCM mode, Vg is the input voltage, and Vc is the output voltage.
In application, a feedforward value of the PFC converter in the DCM mode can be calculated according to the formula ten and the scaling coefficient.
In one embodiment, the feedforward value of the PFC converter in DCM is expressed as follows:
D'=D*KDCM/CMM
wherein D' is a feedforward value in a DCM mode, D is a feedforward value in a CCM mode, and KDCM/CCMIs a scaling factor.
And S802, performing feedback control on the PFC converter according to the feedforward control value.
In application, the processor of the DCM control circuit controls the duty cycle of the input voltage of the PFC converter according to the feedforward control value.
In one embodiment, step S802 includes:
and adjusting the duty ratio of the input voltage of the PFC converter to the feed-forward control value.
As shown in fig. 9, a schematic diagram of simulated waveforms of the input current and the inductor current of the bridgeless PFC converter when the bridgeless PFC converter is DCM-controlled by the DCM control method is exemplarily shown.
As shown in fig. 10, a simulation waveform diagram of the input current and the grid voltage of the bridgeless PFC converter when the bridgeless PFC converter electrically connected to the grid is DCM-controlled by the DCM control method is exemplarily shown.
The embodiment of the invention provides a DCM control method of a PFC converter, and the method comprises the steps of obtaining a first average inductive current of the PFC converter in a DCM mode in a switching period; acquiring a proportionality coefficient between the first average inductive current and a second average inductive current of the PFC converter in a switching period in a CCM mode; obtaining a product of a sampling current value of the PFC converter and the proportionality coefficient to obtain a current feedback control value; and performing feedback control on the PFC converter according to the current feedback control value, so that the PF value of the PFC converter can be obviously improved, the input current harmonic can be reduced, and the PF value and the input current harmonic in the range from the output voltage range, the voltage no-load range to the full-load range of the PFC converter can be obviously improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
As shown in fig. 11, an embodiment of the present invention provides a DCM control circuit 100, which includes a memory 1, a processor 2 and a computer program 11 stored in the memory 1 and executable on the processor 2, where the processor 2 is configured to be electrically connected to the PFC converter and implement the steps of the DCM control method for the PFC converter described above, such as steps S101 to S104 shown in fig. 1, when executing the computer program.
Illustratively, the computer program 11 may be partitioned into one or more modules that are stored in the memory 1 and executed by the processor 2 to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 11 in the DCM control circuit 100. For example, the computer program 11 may be divided into a current obtaining module 111, a first calculating module 112, a second calculating module 113, and a first control module 114, and the specific functions of the modules are as follows:
the current obtaining module 111 is configured to obtain a first average inductor current of the PFC converter in a switching period in the DCM mode;
a first calculating module 112, configured to obtain a proportionality coefficient between the first average inductor current and a second average inductor current of the PFC converter in a switching period in a CCM mode;
a second calculating module 113, configured to obtain a product of the sampling current value of the PFC converter and the scaling factor, so as to obtain a current feedback control value;
and the first control module 114 is configured to perform feedback control on the PFC converter according to the current feedback control value.
In one embodiment, the computer program 11 may also be divided into the following modules:
the third calculation module is used for acquiring the product of the feedforward value of the PFC converter in the CCM mode and the proportionality coefficient to obtain a feedforward control value;
and the second control module is used for carrying out feedback control on the PFC converter according to the feedforward control value.
The DCM control circuit may include, but is not limited to, a memory, a processor. Those skilled in the art will appreciate that FIG. 11 is merely an example of a DCM control circuit, and does not constitute a limitation of a DCM control circuit, and may include more or less components than shown, or some components in combination, or different components.
The memory may be an internal storage unit of the DCM control circuit, such as a memory of the DCM control circuit. The memory may also be an external storage device of the DCM control circuit, for example, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like is provided on the DCM control circuit. Further, the memory may also include both an internal storage unit and an external storage device of the DCM control circuit 100. The memory is used to store the computer program and other programs and data required by the DCM control circuit. The memory may also be used to temporarily store data that has been output or is to be output.
As shown in fig. 12, an embodiment of the present invention further provides a rectifier 1000, which includes a rectification circuit 200, a PFC converter 300 and a DCM control circuit 100, wherein the PFC converter 300 is electrically connected to the rectification circuit 200 and the DCM control circuit 100.
In application, the rectifier circuit may be a full-bridge or half-bridge diode rectifier circuit, and may also be another type of rectifier bridge.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/DCM control circuit and method may be implemented in other ways. For example, the above-described apparatus/DCM control circuit embodiments are merely illustrative, and for example, the division of the modules or units is only one logical function division, and there may be other divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated module, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. . Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims (9)

1. A method for DCM control of a PFC converter, comprising:
acquiring a first average inductive current of a PFC converter in a DCM mode in a switching period;
acquiring a proportionality coefficient between the first average inductive current and a second average inductive current of the PFC converter in a switching period in a CCM mode;
obtaining a product of a sampling current value of the PFC converter and the proportionality coefficient to obtain a current feedback control value;
performing feedback control on the PFC converter according to the current feedback control value;
obtaining a product of a feedforward value of the PFC converter in a CCM mode and the proportionality coefficient to obtain a feedforward control value;
and performing feedback control on the PFC converter according to the feedforward control value.
2. The PFC converter DCM control method of claim 1, wherein the feed-forward value is a duty cycle of an input voltage of the PFC converter in CCM mode;
and performing feedback control on the PFC converter according to the feedforward control value, wherein the feedback control comprises the following steps:
and adjusting the duty ratio of the input voltage of the PFC converter to the feed-forward control value.
3. The method for DCM control of a PFC converter of claim 1 or claim 2, wherein obtaining the first average inductor current for a switching cycle of the PFC converter in DCM comprises:
acquiring an inductive current peak value of the PFC converter;
and acquiring the first average inductive current according to the inductive current peak value, the switching period and the on-time and off-time of an electronic switching tube of the PFC converter in one switching period.
4. The DCM control method of claim 3, wherein the expression for obtaining the first average inductor current according to the peak inductor current value, the switching period, and the on-time and off-time of the electronic switching tube of the PFC converter in one switching period is:
Figure FDA0002752370480000011
wherein, IavgDCMIs the first average inductor current iLb_pkPeak value of inductor current, tyIs the on-time, tRFor the off-time, Ts_pwmIs a switching cycle.
5. The DCM method of claim 3, wherein obtaining the first average inductor current according to the peak inductor current value, the switching period, and the on-time and off-time of the electronic switching tube of the PFC converter in one switching period, comprises:
when the electronic switching tube is conducted, obtaining the conducting time of the electronic switching tube in a switching period according to the inductive current peak value and the input voltage and the inductance of the PFC converter;
when the electronic switching tube is turned off, obtaining the turn-off time of the electronic switching tube in a switching period according to the inductive current peak value and the input voltage, the output voltage and the inductance of the PFC converter;
and acquiring a switching period according to the duty ratio and the on time when the electronic switching tube is switched on or according to the duty ratio and the off time when the electronic switching tube is switched off.
6. The method for DCM control of a PFC converter of claim 1 or claim 2, wherein obtaining the first average inductor current for a switching cycle of the PFC converter in DCM comprises:
and acquiring the first average inductive current according to the inductive current peak value, the input voltage and the output voltage of the PFC converter and the duty ratio of the electronic switching tube of the PFC converter during conduction.
7. The DCM control method of the PFC converter of claim 6, wherein the expression for obtaining the first average inductor current according to the peak value of the inductor current, the input voltage and the output voltage of the PFC converter, and the duty ratio of the electronic switching tube of the PFC converter when conducting is:
Figure FDA0002752370480000021
wherein, IavgDCMIs the first average inductor current iLb_pkIs the peak value of the inductor current, DyAnd Vg is the input voltage and Vc is the output voltage for the duty ratio when the electronic switching tube is conducted.
8. A DCM control circuit comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor being adapted to be electrically connected to the PFC converter and when executing the computer program to implement the steps of a DCM control method for the PFC converter of any of claims 1 to 7.
9. A rectifier comprising a rectifier circuit, a PFC converter and the DCM control circuit of claim 8, the PFC converter being electrically connected to the rectifier circuit and the DCM control circuit.
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