CN112134336B - Control method of PFC circuit based on compatible single-phase and three-phase alternating-current input - Google Patents

Control method of PFC circuit based on compatible single-phase and three-phase alternating-current input Download PDF

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CN112134336B
CN112134336B CN202010780599.0A CN202010780599A CN112134336B CN 112134336 B CN112134336 B CN 112134336B CN 202010780599 A CN202010780599 A CN 202010780599A CN 112134336 B CN112134336 B CN 112134336B
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phase
mode
switched
coupled
bridge pfc
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CN112134336A (en
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寇秋林
杨后跃
罗嗣锦
舒方禹
梁华芳
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Yichuang Zhilian Zhejiang Electronic Technology Co ltd
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Shanghai Wanji Electronic Technology Co ltd
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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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/12—Inductive energy transfer
    • 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
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • 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
    • H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
    • 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
    • H02M7/2173—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 in a biphase or polyphase circuit arrangement
    • 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
    • H02M7/219—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 in a bridge configuration
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0012—Control circuits using digital or numerical techniques
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The invention discloses a control method of a PFC circuit based on compatible single-phase and three-phase alternating-current input, the PFC circuit compatible with single-phase and three-phase alternating-current input comprises power input terminals 1-4, a three-phase bridge PFC unit and a control unit, the three-phase bridge PFC unit comprises an inductance module, a switch module and a filter module which are sequentially coupled, and the control unit comprises a DSP control module, an isolation driving module and a detection module. According to the input of an external alternating current power supply, the wiring relation of a power supply input terminal is changed, and when single-phase alternating current is input, the on-off of a switching tube is controlled based on the wiring relation of the power supply input terminal, so that a three-phase bridge PFC unit works in any one mode of a single-phase bridge PFC mode, a single-phase half-bridge PFC mode or an improved single-phase bridge PFC mode or three working modes are switched to work. According to the method and the device, a suitable working mode is selected according to different application scene requirements and product requirements, three-phase alternating current and single-phase alternating current compatible input is realized, and single-phase input high-efficiency charging can be realized.

Description

Control method of PFC circuit based on compatible single-phase and three-phase alternating-current input
Technical Field
The invention relates to the field of wireless charging, in particular to a control method of a PFC circuit based on compatible single-phase and three-phase alternating-current input.
Background
Along with the increasing emphasis on environmental protection of the country, the increasing emphasis on energy conservation, emission reduction and pollution reduction is vigorously advocated, new energy automobiles gradually become the first choice for consumers to go out, and in addition, the new energy subsidy policy of the country is added, more and more new energy automobiles are gushed like spring bamboo shoots after rain, and the new energy automobiles are particularly outstanding in energy conservation and environmental protection and free of emission, and are more convenient to go out without limiting the number.
However, the problems of difficult and slow charging of new energy vehicles become bottlenecks in the development process of electric vehicles, and particularly, the problems of frequent charging, short driving mileage, high battery cost and the like of electric buses and large-sized electric vehicles are difficult to solve. The non-contact mode mainly adopts a magnetic induction type wireless electric energy transmission system.
When in use, the magnetic induction type wireless power transmission system is limited by the input condition of a power grid of a use occasion, wherein some occasions such as a highway only have three-phase power supply for charging, and some occasions such as a common house or a community only have single-phase power supply. Thus, there is a need for a magnetic induction wireless power transmission system that is compatible with single-phase and three-phase power charging. However, currently, the magnetic induction type wireless power transmission system generally has a small power and low indexes such as harmonic waves and efficiency in a single-phase charging mode.
Disclosure of Invention
The invention aims to provide a control method of a PFC circuit based on compatible single-phase and three-phase alternating-current input, which aims to meet the convenient requirement of timely supplementing the charging energy in various occasions and simultaneously realizes the purposes of high charging speed and high charging efficiency in a single-phase alternating-current charging mode.
The invention is realized by adopting the following technical scheme:
a control method of a PFC circuit based on compatible single-phase and three-phase alternating-current input comprises 4 power input terminals 1-4, a three-phase bridge PFC unit and a control unit. The input end of the power input terminal is used for being coupled with an external alternating current power supply, and the output end of the power input terminal is coupled with the control unit. The three-phase bridge type PFC unit comprises an inductance module, a switch module and a filtering module which are sequentially coupled. The input end of the power input terminal is used for being coupled with an external alternating current power supply, the inductance module comprises inductors L1-L4, and one ends of the inductors L1-L4 are respectively coupled with the control unit. The switch module comprises 8 switch tubes M1-M8, gates of the switch tubes M1-M8 are respectively coupled with the control unit, a source of the switch tube M1 and a drain of the switch tube M5 are coupled with the other end of the inductor L1, a source of the switch tube M2 and a drain of the switch tube M6 are coupled with the other end of the inductor L2, a source of the switch tube M3 and a drain of the switch tube M7 are coupled with the other end of the inductor L3, a source of the switch tube M4 and a drain of the switch tube M8 are coupled with the other end of the inductor L4, drains of the switch tubes M1-M4 are used as first output pins and coupled with a positive input terminal of the filter module, and sources of the switch tubes M5-M8 and a negative input. The output end of the filtering module is used for being coupled with a load. The control unit comprises a DSP control module, an isolation driving module coupled with the output end of the DSP control module and a detection module coupled with the input end of the DSP control module. The input end of the detection module is coupled to the output ends of the power input terminals 1 to 4, the output end of the detection module is coupled to one ends of the inductors L1 to L4, and the output ends of the isolation driving module are coupled to the gates of the switching tubes M1 to M8, respectively. The control method comprises the steps of changing the wiring relation of a power input terminal according to single-phase or three-phase alternating-current input, and enabling the three-phase bridge PFC unit to work in any one mode or three modes of a single-phase bridge PFC mode, a single-phase half-bridge PFC mode or an improved single-phase bridge PFC mode by controlling the on-off of a switching tube based on the wiring relation of the power input terminal through a DSP control module when the single-phase alternating-current power is input.
Furthermore, the power input terminals 1-3 are coupled to L of the single-phase alternating current, and the power input terminal 4 is coupled to N of the single-phase alternating current, so as to control the three-phase bridge PFC unit to operate in the single-phase half-bridge PFC mode.
Further, the method for controlling the three-phase bridge PFC unit to work in the single-phase half-bridge PFC mode specifically includes: when the input voltage is in a positive half cycle, namely L is positive and N is negative, the three-phase bridge PFC unit switches between the following two modes: in the mode 1, the control unit controls the switching tubes M4, M5 and M6 to be switched on, the switching tubes M1, M2 and M3 to be switched off, and the power supply stores energy to the inductors L1, L2 and L3; in the mode 2, the control unit controls the switching tubes M1, M2 and M3 to be switched on, the switching tubes M4, M5 and M6 to be switched off, and the inductors L1, L2 and L3 release energy. When the input voltage is a negative half cycle, namely L is negative and N is positive, the three-phase bridge PFC unit switches to work in the following two modes, namely mode 3, the control unit controls the switching tubes M1, M2 and M3 to be switched on, the switching tubes M4, M5 and M6 to be switched off, and the power supply stores energy to the inductors L1, L2 and L3; in the mode 4, the control unit controls the switching tubes M4, M5 and M6 to be switched on, the switching tubes M1, M2 and M3 to be switched off, and the inductors L1, L2 and L3 release energy.
Furthermore, the power input terminal 1 is coupled to L of the single-phase alternating current, the power input terminal 2 is coupled to N of the single-phase alternating current, and the power input terminals 3 and 4 are suspended to control the three-phase bridge PFC unit to operate in the single-phase bridge PFC mode.
Further, controlling the three-phase bridge PFC unit to work in the single-phase bridge PFC mode specifically includes: when the input voltage is a positive half cycle, namely L is positive and N is negative, the three-phase bridge PFC unit switches to work in the following two modes, namely mode 1, the control unit controls the switching tubes M4 and M5 to be switched on, the switching tubes M1-M3 and M6 to be switched off, and the power supply stores energy to the inductors L1 and L2; in the mode 2, the control unit controls the switching tubes M1 and M5 to be switched on, the switching tubes M1-M4 and M6 to be switched off, and the inductors L1 and L2 release energy. When the input voltage is a negative half cycle, namely L is negative and N is positive, the three-phase bridge PFC unit switches to work in the following two modes, namely mode 3, the control unit controls the switching tubes M4 and M5 to be switched on, the switching tubes M1-M3 and M6 to be switched off, and the power supply stores energy to the inductors L1 and L2; in the mode 4, the control unit controls the switching tubes M2 and M4 to be switched on, the switching tubes M1, M3, M5 and M6 to be switched off, and the inductors L1 and L2 release energy.
Furthermore, the PFC circuit compatible with single-phase and three-phase ac inputs further includes a power input terminal 5, the power input terminals 1 and 2 are coupled to the L of the single-phase ac, the power input terminals 3 and 4 are coupled to the N of the single-phase ac, and the power input terminal 5 is suspended to control the three-phase bridge PFC unit to operate in the improved single-phase bridge PFC mode.
Further, the method for controlling the three-phase bridge PFC unit to operate in the improved single-phase bridge PFC mode specifically includes: when the input voltage is a positive half cycle, namely L is positive and N is negative, the three-phase bridge PFC unit switches to work in the following two modes, namely mode 1, the control unit controls the switching tubes M5-M8 to be switched on, the switching tubes M1-M4 to be switched off, and the power supply stores energy to the inductors L1 and L2; in the mode 2, the control unit controls the switching tubes M1, M2, M7 and M8 to be switched on, the switching tubes M3-M6 to be switched off, and the inductors L1 and L2 release energy. When the input voltage is a negative half cycle, namely L is negative and N is positive, the three-phase bridge PFC unit switches to work in the following two modes, namely mode 3, the control unit controls the switching tubes M5-M8 to be switched on, the switching tubes M1-M4 to be switched off, and the power supply stores energy to the inductors L1 and L2; in the mode 4, the control unit controls the switching tubes M3-M6 to be switched on, the switching tubes M1, M2, M7 and M8 to be switched off, and the inductors L1 and L2 release energy.
Further, the filtering module includes capacitors C1 and C2, an anode of the capacitor C1 is coupled to the first output pin, a cathode of the capacitor C1 and an anode of the capacitor C2 are coupled to the power input terminal 5, and a cathode of the capacitor C2 is used for coupling to ground.
The invention has the following technical advantages or beneficial effects:
according to the method, the wiring relation and the control method of the alternating current input end are changed according to external single-phase or three-phase alternating current input, the compatibility of the three-phase alternating current input and the single-line alternating current input is realized, and the single-phase alternating current input can work in any mode of a single-phase bridge PFC mode, a single-phase half-bridge PFC mode and an improved single-phase bridge PFC mode. And can realize the switching of three kinds of working modes. Providing power and efficiency for single phase charging. The requirement on the universality of wireless charging in different occasions is met, the cost is reduced, and the popularization and the development of a wireless charging system are facilitated.
Drawings
Fig. 1 is a schematic circuit diagram of a PFC circuit compatible with single-phase and three-phase ac inputs according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the operation of mode 1 in which the input voltage of the single-phase half-bridge PFC mode is a positive half cycle according to the embodiment of the present invention;
fig. 3 is a schematic diagram illustrating the operation of mode 2 in which the input voltage of the single-phase half-bridge PFC mode is a positive half cycle according to the embodiment of the present invention;
fig. 4 is a schematic diagram of the operation of mode 3 in which the input voltage of the single-phase half-bridge PFC mode is a negative half cycle according to the embodiment of the present invention;
fig. 5 is a schematic diagram of the operation of mode 4 in which the input voltage of the single-phase half-bridge PFC mode is a negative half cycle according to the embodiment of the present invention;
fig. 6 is a schematic diagram illustrating the operation of mode 1 in which the input voltage of the single-phase bridge PFC mode is a positive half cycle according to the embodiment of the present invention;
fig. 7 is a schematic diagram illustrating operation of mode 2 in which the input voltage of the single-phase bridge PFC mode is a positive half cycle according to the embodiment of the present invention;
fig. 8 is a schematic diagram illustrating the operation of mode 3 in which the input voltage of the single-phase bridge PFC mode is a negative half cycle according to the embodiment of the present invention;
fig. 9 is a schematic diagram illustrating the operation of mode 4 in which the input voltage of the single-phase bridge PFC mode is a negative half cycle according to the embodiment of the present invention;
fig. 10 is a schematic diagram illustrating operation of mode 1 in which the input voltage is a positive half cycle in the improved single-phase bridge PFC mode according to the embodiment of the present invention;
fig. 11 is a schematic diagram illustrating operation of mode 2 in which the input voltage is a positive half cycle in the improved single-phase bridge PFC mode according to the embodiment of the present invention;
fig. 12 is a schematic diagram illustrating operation of mode 3 in which the input voltage is a negative half cycle in the improved single-phase bridge PFC mode according to the embodiment of the present invention;
fig. 13 is a schematic diagram illustrating operation of mode 4 in which the input voltage is a negative half cycle in the improved single-phase bridge PFC mode according to the embodiment of the present invention;
Detailed Description
In order to facilitate a better understanding of the invention for those skilled in the art, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments, which are given by way of illustration only and do not limit the scope of the invention.
As shown in fig. 1, which is a schematic circuit diagram of a PFC circuit compatible with single-phase and three-phase ac inputs according to an embodiment of the present invention, the PFC circuit compatible with single-phase and three-phase ac inputs includes 4 power input terminals 1 to 4, a three-phase bridge PFC unit, and a control unit. The input end of the power input terminal is used for being coupled with an external alternating current power supply, and the output end of the power input terminal is coupled with the inductance module and the control unit. The three-phase bridge type PFC unit comprises an inductance module, a switch module and a filtering module which are coupled in sequence. The inductance module comprises inductors L1-L4, and one ends of the inductors L1-L4 are respectively coupled with 4 power input terminals 1-4. The switch module comprises 8 switch tubes M1-M8, gates of the switch tubes M1-M8 are respectively coupled with the control unit, a source of the switch tube M1 and a drain of the switch tube M5 are coupled with the other end of the inductor L1, a source of the switch tube M2 and a drain of the switch tube M6 are coupled with the other end of the inductor L2, a source of the switch tube M3 and a drain of the switch tube M7 are coupled with the other end of the inductor L3, a source of the switch tube M4 and a drain of the switch tube M8 are coupled with the other end of the inductor L4, drains of the switch tubes M1-M4 are used as first output pins and coupled with a positive input terminal of the filter module, and sources of the switch tubes M5-M8 and a negative input. The output end of the filtering module is used for being coupled with a load. The control unit comprises a DSP control module and an isolation driving module coupled with the output end of the DSP control module, the DSP control module is coupled with 4 power input terminals 1-4, and the output end of the isolation driving module is coupled with the grids of the switching tubes M1-M8 respectively.
It should be noted that, in consideration of safety performance and EMC, the rear end of the power input terminal is coupled to a safety capacitor, and the connection relationship is as shown in fig. 1, namely, safety capacitors C3-C6.
The invention relates to a control method of a PFC circuit based on compatible single-phase and three-phase alternating-current input, which changes the wiring relation of a power input terminal according to single-phase or three-phase alternating-current power input, and when the single-phase alternating-current power is input, a DSP control module controls the on and off of a switching tube based on the wiring relation of the power input terminal to enable a three-phase bridge PFC unit to work in any one mode or three modes of a single-phase bridge PFC mode, a single-phase half-bridge PFC mode or an improved single-phase bridge PFC mode.
The control method of the PFC circuit based on compatible single-phase and three-phase ac inputs according to the present invention is further described in detail with reference to fig. 2 to 13.
Fig. 2-5 are schematic diagrams illustrating the operation of the single-phase half-bridge PFC mode according to an embodiment of the present invention, when the external power input by the wireless charging system of the vehicle is a single-phase ac power, the power input terminals 1-3 are coupled to the single-phase ac power L, and the power input terminal 4 is coupled to the single-phase ac power N.
When the input voltage is in a positive half period, namely L is a positive voltage and N is a negative voltage, the single-phase half-bridge PFC mode alternately works in a mode 1 and a mode 2. In the mode 1 shown in fig. 2, the MOS transistor M4(M5, M6) is turned on, and the power supply stores energy in the inductor L1(L2, L3). The current flows to: l → L1(L2, L3) → M4(M5, M6) → C2 → power supply N. The capacitors C1, C2 provide energy to the load R1. In mode 2 shown in fig. 3, MOS transistor M1(M2, M3) is turned on, inductor L1(L2, L3) releases energy, and capacitor C1 stores energy. The current flows to: power L → L1(L2, L3) → M1(M2, M3) → C1 → power N. The capacitors C1 and C2 supply energy to a load R1;
when the input voltage is in a negative half period, i.e., L is a negative voltage and N is a positive voltage. The single phase half bridge PFC mode alternates operation in mode 3 and mode 4. In mode 3 shown in fig. 4, the MOS transistor M1(M2, M3) is turned on, and the inductor L1(L2, L3) stores energy. The current flows to: power supply N → C1 → M1(M2, M3) → L1(L2, L3) → power supply L. The capacitors C1, C2 provide energy to the load R1. In mode 4 shown in fig. 5, MOS transistor M4(M5, M6) is turned on, inductor L1(L2, L3) releases energy, and capacitor C2 stores energy. The current flows to: power supply N → C2 → M4(M5, M6) → L1(L2, L3) → power supply L. The capacitors C1, C2 provide energy to the load R1.
Fig. 6-9 are schematic diagrams illustrating the operation of the single-phase bridge PFC mode according to the embodiment of the present invention, when the external power input by the wireless charging system of the vehicle is a single-phase ac power, the power input terminal 1 is coupled to the single-phase ac power L, and the power input terminal 2 is coupled to the single-phase ac power N.
When the input voltage is in a positive half period, namely L is a positive voltage and N is a negative voltage, the single-phase bridge PFC mode alternately works in a mode 1 and a mode 2. In the mode 1 shown in fig. 6, the MOS transistors M4 and M5 are turned on, and the power supply stores energy in the inductors L1 and L2. The current flows to: power supply L → L1 → M4 → M5 → L2 → power supply N. The capacitors C1, C2 provide energy to the load R1. In the mode 2 shown in fig. 7, the MOS transistors M1 and M5 are turned on, the inductors L1 and L2 release energy, and the capacitors C1 and C2 store energy and supply energy to the load R1. The current flows to: power supply L → L1 → M1 → C1, C2 or R1 → M5 → L2 → power supply N.
When the input voltage is in a negative half period, i.e., L is a negative voltage and N is a positive voltage. The single-phase bridge PFC mode operates alternately in mode 3 and mode 4. In mode 3 shown in fig. 8, MOS transistors M4 and M5 are turned on, and the power supply stores energy in inductors L1 and L2. The current flows to: power supply N → L2 → M5 → M4 → L1 → power supply L. The capacitors C1, C2 provide energy to the load R1. In the mode 4 shown in fig. 9, the MOS transistors M2 and M4 are turned on, the inductors L1 and L2 release energy, and the capacitors C1 and C2 store energy and supply energy to the load R1. The current flows to: power supply N → L2 → M2 → C1, C2 or R1 → M4 → L1 → power supply L.
Fig. 10-13 are schematic diagrams illustrating operation of the improved single-phase bridge PFC mode according to an embodiment of the present invention, when the external power input by the wireless charging system of the vehicle is a single-phase ac power, the power input terminal 1-2 is coupled to the single-phase ac power L, and the power input terminal 3-4 is coupled to the single-phase ac power N.
When the input voltage is in a positive half period, namely L is a positive voltage and N is a negative voltage, the improved single-phase bridge PFC mode alternately works in a mode 1 and a mode 2. In the mode 1 shown in fig. 10, the MOS transistors M5, M6, M7, and M8 are turned on, and the power supply stores energy in the inductors L1 and L2. The current flows to: power L → L1(L2) → M5(M6) → M7(M8) → L3(L4) → power N. The capacitors C1, C2 provide energy to the load R1. In the mode 2 shown in fig. 11, MOS transistors M1, M2, M7, and M8 are turned on, inductors L1 and L2 release energy, capacitors C1 and C2 store energy, and simultaneously supply energy to load R1. The current flows to: power L → L1(L2) → M1(M2) → C1, C2 or R1 → M7(M8) → L3(L4) → power N.
When the input voltage is in a negative half period, i.e., L is a negative voltage and N is a positive voltage. The modified single phase bridge PFC mode alternates operation in mode 3 and mode 4. In mode 3 shown in fig. 12, MOS transistors M5, M6, M7, and M8 are turned on, and the power supply stores energy in inductors L1 and L2. The current flows to: power supply N → L3(L4) → M7(M8) → M5(M6) → L1(L2) → power supply L. The capacitors C1, C2 provide energy to the load R1. In mode 4 shown in fig. 13, MOS transistors M3, M4, M5, and M6 are turned on, inductors L1 and L2 release energy, capacitors C1 and C2 store energy, and simultaneously supply energy to load R1. The current flows to: power supply N → L3(L4) → M3(M4) → C1, C2 or R1 → M5(M6) → L1(L2) → power supply L.
In this embodiment, the circuit shown in fig. 1 is connected to a three-phase ac power supply, the three-phase charging power is 11kW, and a single-phase half-bridge PFC mode is adopted to properly adjust inductance and capacitance parameters, so that the single-phase power can reach 11 kW. A single-phase bridge PFC mode is adopted, no parameter is adjusted, and the single-phase power is 3.3 kW. For the modified phase bridge PFC mode, the single phase power is 6.6 kW.
It should be noted that the types and specifications of the MOS transistor, the inductor, and the capacitor may be selected according to actual situations. Under the conditions of three-phase alternating current power supply input and single-phase alternating current input, the wiring relation of the power supply input terminal can be adjusted by adopting any mode of a control module, a switch, a relay or manual operation and the like according to different products and different scene requirements. The DSP control module can acquire the switching action for controlling the wiring relation through the detection module, and also can acquire the electric parameter information of current or voltage and the like of the input terminal, so that the wiring relation of the power input terminal is judged and obtained.
According to the embodiment, the control method of the PFC circuit based on compatible single-phase and three-phase alternating-current input can realize the compatibility of single-phase input and three-phase input through the connection relation of power input and the control of the switching tube. And single-phase charging power and efficiency can be improved, good universality is achieved, and the method is suitable for application of different products in different scenes.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall into the protection scope of the claims of the present invention.

Claims (7)

1. A control method based on a PFC circuit compatible with single-phase and three-phase alternating-current input comprises 4 power input terminals 1-4, a three-phase bridge PFC unit and a control unit, wherein the input end of each power input terminal is used for being coupled with an external alternating-current power supply, and the output end of each power input terminal is coupled with the control unit;
the three-phase bridge PFC unit comprises an inductance module, a switch module and a filter module which are sequentially coupled, wherein the inductance module comprises inductances L1-L4, and one ends of the inductances L1-L4 are respectively coupled with a control unit; the switch module comprises 8 switch tubes M1-M8, gates of the switch tubes M1-M8 are respectively coupled with the control unit, a source of the switch tube M1 and a drain of the switch tube M5 are coupled with the other end of the inductor L1, a source of the switch tube M2 and a drain of the switch tube M6 are coupled with the other end of the inductor L2, a source of the switch tube M3 and a drain of the switch tube M7 are coupled with the other end of the inductor L3, a source of the switch tube M4 and a drain of the switch tube M8 are coupled with the other end of the inductor L4, drains of the switch tubes M1-M4 are coupled with a positive input terminal of the filter module as a first output pin, and sources of the switch tubes M5-M8 and a negative input terminal of the; the output end of the filtering module is used for being coupled with a load;
the control unit comprises a DSP control module, an isolation driving module coupled with the output end of the DSP control module, and a detection module coupled with the input end of the DSP control module; the input end of the detection module is coupled with the output ends of the power input terminals 1-4, the output end of the detection module is coupled with one ends of the inductors L1-L4, and the output ends of the isolation driving module are respectively coupled with the grids of the switching tubes M1-M8, wherein the control method comprises the following steps:
the connection relation of the power input terminals is changed according to the input of a single-phase or three-phase alternating current power supply, when the single-phase alternating current power supply is input, the DSP control module controls the on and off of the switching tube based on the connection relation of the power input terminals, so that the three-phase bridge PFC unit works in any one mode or three modes of a single-phase bridge PFC mode, a single-phase half-bridge PFC mode or an improved single-phase bridge PFC mode,
the PFC circuit compatible with single-phase and three-phase alternating current input further comprises a power input terminal 5, the power input terminals 1 and 2 are coupled with the L of the single-phase alternating current, and when the power input terminals 3 and 4 are coupled with the N of the single-phase alternating current, the power input terminal 5 is suspended to control the three-phase bridge PFC unit to work in an improved single-phase bridge PFC mode.
2. The control method according to claim 1, characterized in that: when the power input terminals 1-3 are coupled to the L of the single-phase alternating current and the power input terminal 4 is coupled to the N of the single-phase alternating current, the three-phase bridge PFC unit is controlled to work in a single-phase half-bridge PFC mode.
3. The method according to claim 2, wherein the method for controlling the three-phase bridge PFC unit to operate in the single-phase half-bridge PFC mode specifically comprises:
when the input voltage is in a positive half period, i.e. L is positive and N is negative, the three-phase bridge PFC unit switches to operate in the following two modes,
in the mode 1, the control unit controls the switching tubes M4, M5 and M6 to be switched on, the switching tubes M1, M2 and M3 to be switched off, and the power supply stores energy to the inductors L1, L2 and L3;
in the mode 2, the control unit controls the switching tubes M1, M2 and M3 to be switched on, the switching tubes M4, M5 and M6 to be switched off, and the inductors L1, L2 and L3 release energy;
when the input voltage is in a negative half period, i.e. L is negative and N is positive, the three-phase bridge PFC unit is switched to operate in the following two modes,
in the mode 3, the control unit controls the switching tubes M1, M2 and M3 to be switched on, the switching tubes M4, M5 and M6 to be switched off, and the power supply stores energy to the inductors L1, L2 and L3;
in the mode 4, the control unit controls the switching tubes M4, M5 and M6 to be switched on, the switching tubes M1, M2 and M3 to be switched off, and the inductors L1, L2 and L3 release energy.
4. The control method according to claim 1, characterized in that: when the power input terminal 1 is coupled with the L of the single-phase alternating current and the power input terminal 2 is coupled with the N of the single-phase alternating current, the power input terminals 3 and 4 are suspended to control the three-phase bridge PFC unit to work in a single-phase bridge PFC mode.
5. The control method according to claim 4, wherein controlling the three-phase bridge PFC unit to operate in the single-phase bridge PFC mode specifically comprises:
when the input voltage is in a positive half period, i.e. L is positive and N is negative, the three-phase bridge PFC unit switches to operate in the following two modes,
in the mode 1, the control unit controls the switching tubes M4 and M5 to be switched on, the switching tubes M1-M3 and M6 to be switched off, and the power supply stores energy to the inductors L1 and L2;
in the mode 2, the control unit controls the switching tubes M1 and M5 to be switched on, the switching tubes M1-M4 and M6 to be switched off, and the inductors L1 and L2 release energy;
when the input voltage is in a negative half period, i.e. L is negative and N is positive, the three-phase bridge PFC unit is switched to operate in the following two modes,
in the mode 3, the control unit controls the switching tubes M4 and M5 to be switched on, the switching tubes M1-M3 and M6 to be switched off, and the power supply stores energy to the inductors L1 and L2;
in the mode 4, the control unit controls the switching tubes M2 and M4 to be switched on, the switching tubes M1, M3, M5 and M6 to be switched off, and the inductors L1 and L2 release energy.
6. The method as claimed in claim 1, wherein the method for controlling the three-phase bridge PFC unit to operate in the modified single-phase bridge PFC mode specifically comprises:
when the input voltage is in a positive half period, i.e. L is positive and N is negative, the three-phase bridge PFC unit switches to operate in the following two modes,
in the mode 1, the control unit controls the switching tubes M5-M8 to be switched on, the switching tubes M1-M4 to be switched off, and the power supply stores energy to the inductors L1 and L2;
in the mode 2, the control unit controls the switching tubes M1, M2, M7 and M8 to be switched on, the switching tubes M3-M6 are switched off, and the inductors L1 and L2 release energy;
when the input voltage is in a negative half period, i.e. L is negative and N is positive, the three-phase bridge PFC unit is switched to operate in the following two modes,
in the mode 3, the control unit controls the switching tubes M5-M8 to be switched on, the switching tubes M1-M4 to be switched off, and the power supply stores energy to the inductors L1 and L2;
in the mode 4, the control unit controls the switching tubes M3-M6 to be switched on, the switching tubes M1, M2, M7 and M8 to be switched off, and the inductors L1 and L2 release energy.
7. The control method according to claim 1, wherein the filtering module comprises capacitors C1 and C2, the anode of the capacitor C1 is coupled to the first output pin, the cathode of the capacitor C1 and the anode of the capacitor C2 are coupled to the power input terminal 5, and the cathode of the capacitor C2 is used for coupling to ground.
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