CN110723005B - Vehicle-mounted charger of electric vehicle, control method of vehicle-mounted charger and electric vehicle - Google Patents

Vehicle-mounted charger of electric vehicle, control method of vehicle-mounted charger and electric vehicle Download PDF

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Publication number
CN110723005B
CN110723005B CN201810711973.4A CN201810711973A CN110723005B CN 110723005 B CN110723005 B CN 110723005B CN 201810711973 A CN201810711973 A CN 201810711973A CN 110723005 B CN110723005 B CN 110723005B
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China
Prior art keywords
bridge arm
power grid
lower bridge
upper bridge
igbt
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CN110723005A (en
Inventor
冯梓允
王超
王兴辉
张妮
刘坤
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BYD Co Ltd
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BYD Co Ltd
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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
    • 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
    • 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
    • H02M7/2195—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 the switches being synchronously commutated at the same frequency of the AC input voltage
    • 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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a vehicle-mounted charger of an electric automobile, a control method thereof and the electric automobile, wherein the vehicle-mounted charger comprises: the input module is used for receiving alternating current of a power grid; the output module is used for outputting direct current to the battery to charge the battery; the power supply conversion module comprises a first upper bridge arm, a first lower bridge arm, a second upper bridge arm and a second lower bridge arm and is used for converting alternating current into direct current; and the control module is used for controlling the first upper bridge arm and the first lower bridge arm to be switched on or switched off at a preset frequency according to the alternating current of the power grid when the power supply conversion module carries out rectification, wherein the second upper bridge arm and the second lower bridge arm are respectively switched on through forward voltages applied to anti-parallel diodes of the second upper bridge arm and the second lower bridge arm. Therefore, the function of the vehicle-mounted charger is realized, the driving loss and the heating of a bridge arm are reduced, and the user experience is improved.

Description

Vehicle-mounted charger of electric vehicle, control method of vehicle-mounted charger and electric vehicle
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a vehicle-mounted charger of an electric automobile, the electric automobile and a control method of the vehicle-mounted charger of the electric automobile.
Background
Along with the commercialization progress of electric vehicles, chargers mounted on electric vehicles have become one of important parts of electric vehicles. At present, a bidirectional vehicle-mounted charger is widely applied, and a used single-phase H-bridge topology is shown in fig. 1 and mainly comprises a power grid AC source, an AC side X capacitor C1, energy storage inductors L1 and L2, 4 IGBT (Insulated Gate Bipolar Transistor) transistors T1/T2/T3/T4 and a finished vehicle battery pack DC source.
In the related art, the IGBT is basically controlled by a unipolar Modulation method, that is, a PWM (Pulse Width Modulation) driving waveform (as shown in fig. 2) for controlling 4 IGBTs.
During the positive half cycle of the power grid, the T3 can be controlled to be normally open, the T1 and the T2 are alternately switched on and off at high frequency, and the power grid can charge the energy storage inductor when the T1 and the T3 are switched on; when the T2 and the T3 are turned on, the energy storage inductor discharges, and the energy storage inductor and the power grid can charge the battery together. In the time period of the negative half cycle of the power grid, the T1 can be controlled to be normally open, the T3 and the T4 are alternately switched on and off at high frequency, and the power grid can charge the energy storage inductor when the T1 and the T3 are switched on; when the T1 and the T4 are turned on, the energy storage inductor discharges, and at the moment, the energy storage inductor and the power grid charge the battery together.
It can be seen that according to the control method for the IGBT in the above-described related art, T1 and T2 high frequency switch when the grid is in the positive half cycle period, and T3 and T4 high frequency switch when the grid is in the negative half cycle period. Among them, T1, T2, T3 and T4 are switched at high frequency in turn in positive and negative half cycles of the power grid, which can equalize the heat generation of the IGBT transistors to some extent. But the IGBT transistors still heat up more severely.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above.
Therefore, a first object of the present invention is to provide an on-board charger for an electric vehicle, which can reduce driving loss and heat generation of a bridge arm while implementing the function of the on-board charger, and improve user experience.
The second purpose of the invention is to provide an electric automobile.
The third purpose of the invention is to provide a control method of the vehicle-mounted charger of the electric automobile.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides an onboard charger for an electric vehicle, including: the input module comprises a first alternating current input end, a second alternating current input end and an inductance unit, the first alternating current input end and the second alternating current input end are connected with a power grid, and the input module receives alternating current of the power grid through the first alternating current input end and the second alternating current input end; the output module comprises a first direct current output end and a second direct current output end, the first direct current output end is connected with the positive electrode of the battery of the electric automobile, the second direct current output end is connected with the negative electrode of the battery of the electric automobile, and the output module outputs direct current to the battery through the first direct current output end and the second direct current output end to charge the battery; the power supply conversion module comprises a first upper bridge arm, a first lower bridge arm, a second upper bridge arm and a second lower bridge arm, wherein a first end of the first upper bridge arm is connected with a first end of the first lower bridge arm and is connected with the second alternating current input end through the inductance unit, a first end of the second upper bridge arm is connected with a first end of the second lower bridge arm and is connected with the first alternating current input end through the inductance unit, a second end of the first upper bridge arm is connected with a second end of the second upper bridge arm and is connected with the first direct current output end, a second end of the first lower bridge arm is connected with a second end of the second lower bridge arm and is connected with the second direct current output end, and the power supply conversion module is used for converting the alternating current into the direct current; and the control module controls the first upper bridge arm and the first lower bridge arm to be switched on or switched off at a preset frequency according to the alternating current of the power grid when the power supply conversion module performs rectification, wherein the second upper bridge arm and the second lower bridge arm are respectively switched on through forward voltages applied to anti-parallel diodes of the second upper bridge arm and the second lower bridge arm.
According to the vehicle-mounted charger of the electric vehicle, the input module receives alternating current of a power grid through the first alternating current input end and the second alternating current input end, the output module outputs direct current to the battery through the first direct current output end and the second direct current output end to charge the battery, the power supply conversion module converts the alternating current into the direct current, the control module controls the first upper bridge arm and the first lower bridge arm of the power supply conversion module to be connected or disconnected at a preset frequency according to the alternating current of the power grid when the power supply conversion module conducts rectification, and the second upper bridge arm and the second lower bridge arm of the power supply conversion module are respectively connected through forward voltages applied to anti-parallel diodes of the second upper bridge arm and the second lower bridge arm. Therefore, the function of the vehicle-mounted charger can be realized by controlling the first upper bridge arm and the first lower bridge arm and the forward voltages applied to the anti-parallel diodes of the second upper bridge arm and the second lower bridge arm, so that the driving loss and the heat generation of the bridge arms can be reduced, and the user experience can be improved.
In addition, the charger mounted on the vehicle of the electric vehicle according to the above embodiment of the present invention may further have the following additional technical features:
in an embodiment of the present invention, when the ac power of the power grid is in a positive half-cycle, the control module controls the first upper bridge arm to be turned on or off at the preset frequency, wherein when the first upper bridge arm is turned on, the second upper bridge arm is turned on by a forward voltage applied to an anti-parallel diode of the second upper bridge arm through the power grid, and the power grid forms a loop with the first upper bridge arm and the second upper bridge arm through the input module, so that the power grid charges the inductance unit; when the first upper bridge arm is turned off, forward voltages applied to anti-parallel diodes of the second upper bridge arm and the first lower bridge arm through the power grid and the inductance unit are respectively conducted, the power grid forms a loop with the battery through the input module, the first lower bridge arm, the second upper bridge arm and the output module, and the power grid and the inductance unit charge the battery together.
In an embodiment of the present invention, when the alternating current of the power grid is in a negative half-cycle, the control module controls the first lower bridge arm to be turned on or off at the preset frequency, wherein when the first lower bridge arm is turned on, the second lower bridge arm is turned on by a forward voltage applied to an anti-parallel diode of the second lower bridge arm through the power grid, and the power grid forms a loop with the first lower bridge arm and the second lower bridge arm through the input module, so that the power grid charges the inductance unit; when the first lower bridge arm is turned off, forward voltages applied to anti-parallel diodes of the second lower bridge arm and the first upper bridge arm through the power grid and the inductance unit are respectively conducted, the power grid forms a loop with the battery through the input module, the first upper bridge arm, the second lower bridge arm and the output module, and the power grid and the inductance unit charge the battery together.
In an embodiment of the present invention, the first upper bridge arm includes a first IGBT, an emitter of the first IGBT is used as a first end of the first upper bridge arm, a collector of the first IGBT is used as a second end of the first upper bridge arm, a gate of the first IGBT is connected to the control module, and the first IGBT further has a first diode connected in anti-parallel, where the first IGBT is turned on or off under the action of a first control signal output by the control module, and the first diode is turned on by a forward voltage applied to the first diode; the first lower bridge arm comprises a second IGBT, a collector of the second IGBT is used as a first end of the first lower bridge arm, an emitter of the second IGBT is used as a second end of the first lower bridge arm, a grid electrode of the second IGBT is connected with the control module, the second IGBT is also provided with a second diode which is connected in an anti-parallel mode, the second IGBT is switched on or switched off under the action of a second control signal output by the control module, and the second diode is switched on through a forward voltage applied to the second diode; the second upper bridge arm comprises a third IGBT, an emitter of the third IGBT is used as a first end of the second upper bridge arm, a collector of the third IGBT is used as a second end of the second upper bridge arm, a grid electrode of the third IGBT is connected with the control module, the third IGBT is further provided with a third diode connected in an anti-parallel mode, the third IGBT keeps being turned off under the action of a third control signal output by the control module, and the third diode is turned on through a forward voltage applied to the third diode; the second lower bridge arm comprises a fourth IGBT, a collector of the fourth IGBT is used as a first end of the second lower bridge arm, an emitter of the fourth IGBT is used as a second end of the second lower bridge arm, a grid of the fourth IGBT is connected with the control module, the fourth IGBT is further provided with a fourth diode connected in an anti-parallel mode, the fourth IGBT keeps being turned off under the action of a fourth control signal output by the control module, and the fourth diode is turned on through a forward voltage applied to the fourth diode.
In one embodiment of the present invention, the first control signal and the second control signal are PWM signals, and the third control signal and the fourth control signal are low level signals.
In one embodiment of the present invention, the inductance unit includes: one end of the first inductor is connected with the first alternating current input end, and the other end of the first inductor is respectively connected with the first end of the second upper bridge arm and the first end of the second lower bridge arm; one end of the second inductor is connected with the second alternating current input end, and the other end of the second inductor is respectively connected with the first end of the first upper bridge arm and the first end of the first lower bridge arm;
in one embodiment of the present invention, the input module further comprises a first capacitor connected in parallel between the first ac input terminal and the second ac input terminal; the output module further comprises a second capacitor, and the second capacitor is connected in parallel between the first direct current output end and the second direct current output end.
In order to achieve the above object, an electric vehicle according to an embodiment of a second aspect of the present invention includes: the vehicle-mounted charger of the electric vehicle of the embodiment of the first aspect of the invention.
According to the electric automobile provided by the embodiment of the invention, through the vehicle-mounted charger of the electric automobile, the driving loss and the heating of a bridge arm in the vehicle-mounted charger can be reduced, and the user experience of the vehicle-mounted charger can be improved.
In order to achieve the above object, a third aspect of the present invention provides a method for controlling an onboard charger of an electric vehicle, including: receiving alternating current of a power grid through a first alternating current input end and a second alternating current input end in an input module; converting the alternating current into direct current through a power conversion module, wherein when the power conversion module is used for rectifying, a first upper bridge arm and a first lower bridge arm of the power conversion module are controlled to be switched on or switched off at a preset frequency according to the alternating current of the power grid, and a second upper bridge arm and a second lower bridge arm of the power conversion module are respectively switched on through forward voltages applied to anti-parallel diodes of the second upper bridge arm and the second lower bridge arm; and outputting the direct current to a battery through a first direct current output end and a second direct current output end in an output module to charge the battery.
According to the control method of the vehicle-mounted charger of the electric vehicle, firstly, the first alternating current input end and the second alternating current input end in the input module receive alternating current of a power grid, then the alternating current is converted into direct current through the power supply conversion module, when the power supply conversion module carries out rectification, the first upper bridge arm and the first lower bridge arm of the power supply conversion module are controlled to be switched on or switched off at a preset frequency according to the alternating current of the power grid, the second upper bridge arm and the second lower bridge arm of the power supply conversion module are respectively switched on through forward voltages applied to anti-parallel diodes of the second upper bridge arm and the second lower bridge arm, and finally, the direct current is output to a battery through the first direct current output end and the second direct current output end in the output module to charge the battery, so that the forward voltages applied to the anti-parallel diodes of the second upper bridge arm and the second lower bridge arm can be controlled, the function of the vehicle-mounted charger is realized, the driving loss and the heating of a bridge arm can be reduced, and the user experience can be improved.
In addition, the control method for the vehicle-mounted charger of the electric vehicle according to the above embodiment of the present invention may further have the following additional technical features:
in an embodiment of the present invention, when the ac power of the power grid is in a positive half-cycle, the first upper bridge arm is controlled to be turned on or off at the preset frequency, wherein when the first upper bridge arm is turned on, the second upper bridge arm is turned on by a forward voltage applied to an anti-parallel diode of the second upper bridge arm through the power grid, and the power grid forms a loop with the first upper bridge arm and the second upper bridge arm through the input module, so that the power grid charges an inductance unit in the output module; when the first upper bridge arm is turned off, forward voltages applied to anti-parallel diodes of the second upper bridge arm and the first lower bridge arm through the power grid and the inductance unit are respectively conducted, the power grid forms a loop with the battery through the input module, the first lower bridge arm, the second upper bridge arm and the output module, and the power grid and the inductance unit charge the battery together.
In an embodiment of the present invention, when the alternating current of the power grid is in a negative half-cycle, the first lower bridge arm is controlled to be turned on or off at the preset frequency, wherein when the first lower bridge arm is turned on, the second lower bridge arm is turned on by a forward voltage applied to an anti-parallel diode of the second lower bridge arm through the power grid, and the power grid forms a loop with the first lower bridge arm and the second lower bridge arm through the input module, so that the power grid charges an inductance unit of the input module; when the first lower bridge arm is turned off, forward voltages applied to anti-parallel diodes of the second lower bridge arm and the first upper bridge arm through the power grid and the inductance unit are respectively conducted, the power grid forms a loop with the battery through the input module, the first upper bridge arm, the second lower bridge arm and the output module, and the power grid and the inductance unit charge the battery together.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a single-phase H-bridge topology of an on-board charger of an electric vehicle according to the related art;
fig. 2 is a PWM waveform diagram of an on-board charger of an electric vehicle according to the related art;
FIG. 3 is a block schematic diagram of an onboard charger for an electric vehicle in accordance with one embodiment of the present invention;
FIG. 4 is a single phase H-bridge topology of an onboard charger for an electric vehicle according to one embodiment of the present invention;
FIG. 5 is a PWM waveform diagram of an on-board charger of an electric vehicle according to one embodiment of the present invention;
FIG. 6 is a schematic diagram of the operation of a single-phase H-bridge of an on-board charger for an electric vehicle according to an embodiment of the present invention;
fig. 7 is an operation principle diagram of a single-phase H-bridge of an on-board charger of an electric vehicle according to another embodiment of the present invention;
FIG. 8 is a schematic diagram of the operation of a single-phase H-bridge of an on-board charger for an electric vehicle according to yet another embodiment of the present invention;
fig. 9 is an operation principle diagram of a single-phase H-bridge of an on-board charger of an electric vehicle according to still another embodiment of the present invention; and
fig. 10 is a flowchart of a method of controlling an in-vehicle charger of an electric vehicle according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An on-board charger for an electric vehicle, and a control method of the on-board charger for an electric vehicle according to embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 3 is a block schematic diagram of an onboard charger for an electric vehicle according to one embodiment of the present invention. In an embodiment of the present invention, the in-vehicle charger may be a bidirectional in-vehicle charger.
As shown in fig. 3, the charger mounted on an electric vehicle according to the embodiment of the present invention includes: the input module 100, the output module 200, the power conversion module 300 and the control module 400.
As shown in fig. 4, the input module 100 (not shown in fig. 4) includes a first AC input terminal 11, a second AC input terminal 12, and an inductance unit 13, the first AC input terminal 11 and the second AC input terminal 12 are connected to the grid AC, and the input module 100 receives AC power from the grid AC through the first AC input terminal 11 and the second AC input terminal 12. Therein, the voltage of the alternating current of the grid AC may be 220V.
Optionally, as shown in fig. 4, the input module 100 may further include a first capacitor C1, and the first capacitor C1 is connected in parallel between the first ac input terminal 11 and the second ac input terminal 12.
The output module 200 (not shown in fig. 4) includes a first DC output terminal 21 and a second DC output terminal 22, the first DC output terminal 21 is connected to a positive electrode of the battery DC of the electric vehicle, the second DC output terminal 22 is connected to a negative electrode of the battery DC of the electric vehicle, and the output module 200 outputs a DC power to the battery DC through the first DC output terminal 21 and the second DC output terminal 22 to charge the battery DC.
Optionally, the output module 200 may further include a second capacitor C2, and the second capacitor C2 is connected in parallel between the first dc output terminal and 21 and the second dc output terminal 22.
The power conversion module 300 includes a first upper bridge arm, a first lower bridge arm, a second upper bridge arm and a second lower bridge arm, a first end of the first upper bridge arm is connected to a first end of the first lower bridge arm and connected to the second ac input terminal 12 through the inductance unit 13, a first end of the second upper bridge arm is connected to a first end of the second lower bridge arm and connected to the first ac input terminal 11 through the inductance unit 13, a second end of the first upper bridge arm is connected to a second end of the second upper bridge arm and connected to the first dc output terminal 21, a second end of the first lower bridge arm is connected to a second end of the second lower bridge arm and connected to the second dc output terminal 22, and the power conversion module 300 is configured to convert ac power to dc power.
Further, as shown in fig. 4, the first upper leg may include a first IGBT (T1), an emitter E of the first IGBT (T1) serving as a first end of the first upper leg, a collector C of the first IGBT (T1) serving as a second end of the first upper leg, a gate g of the first IGBT (T1) connected to the control module 400, and a first diode D1 connected in anti-parallel to the first IGBT (T1), wherein the first IGBT (T1) is turned on or off by a first control signal output from the control module 400, and the first diode D1 is turned on by a forward voltage applied to the first diode D1. Among them, the first control signal may be a PWM signal, for example, a PWM waveform in fig. 5 that controls the first IGBT (T1).
The first lower leg may include a second IGBT (T2), a collector C of the second IGBT (T2) serving as a first end of the first lower leg, an emitter E of the second IGBT (T2) serving as a second end of the first lower leg, a gate g of the second IGBT (T2) connected to the control module 400, and the second IGBT (T2) further having a second diode D2 connected in anti-parallel, wherein the second IGBT (T2) is turned on or off by a second control signal output from the control module 400, and the second diode D2 is turned on by a forward voltage applied to the second diode D2. Here, the second control signal may be a PWM signal, for example, a PWM waveform in fig. 5 that controls the second IGBT (T2).
The second upper leg may include a third IGBT (T3), an emitter E of the third IGBT (T3) serving as the first end of the second upper leg, a collector C of the third IGBT (T3) serving as the second end of the second upper leg, a gate g of the third IGBT (T3) connected to the control module 400, and the third IGBT (T3) further having a third diode D3 connected in anti-parallel, wherein the third IGBT (T3) is kept turned off by a third control signal output from the control module 400, and the third diode D3 is turned on by a forward voltage applied to the third diode D3. Wherein, the third control signal may be a low level signal.
The second lower leg may include a fourth IGBT (T4), a collector C of the fourth IGBT (T4) serving as the first end of the second lower leg, an emitter E of the fourth IGBT (T4) serving as the second end of the second lower leg, a gate g of the fourth IGBT (T4) connected to the control module 400, and the fourth IGBT (T4) further having a fourth diode D4 connected in anti-parallel, wherein the fourth IGBT (T4) is kept turned off by a fourth control signal output from the control module 400, and the fourth diode D4 is turned on by a forward voltage applied to the fourth diode D4. The fourth control signal may be a low level signal.
It should be noted that the first IGBT (T1), the second IGBT (T2), the third IGBT (T3), and the fourth IGBT (T4) described in this embodiment each have a forward-conduction characteristic in which current can flow only from the collector C to the emitter E, but not from the emitter E to the collector C. That is, the first IGBT (T1), the second IGBT (T2), the third IGBT (T3), and the fourth IGBT (T4) are not conductive in the reverse direction, and the diodes can be turned on only by applying a forward voltage to their antiparallel diodes.
In addition, in one embodiment of the present invention, as shown in fig. 4, the inductance unit 13 may include a first inductance L1, and a second inductance L2. One end of a first inductor L1 is connected to the first AC input terminal 11, the other end of the first inductor L1 is connected to the first end of the second upper bridge arm and the first end of the second lower bridge arm, respectively, one end of a second inductor L2 is connected to the second AC input terminal 12, and the other end of the second inductor L2 is connected to the first end of the first upper bridge arm and the first end of the first lower bridge arm, respectively.
When the power conversion module 300 performs rectification, the control module 400 controls the first upper bridge arm and the first lower bridge arm to be turned on or off at a preset frequency according to the alternating current of the power grid AC, wherein the second upper bridge arm and the second lower bridge arm are respectively turned on by forward voltages applied to anti-parallel diodes of the second upper bridge arm and the second lower bridge arm. The preset frequency can be calibrated according to actual conditions.
Specifically, when the alternating current of the power grid AC is in a positive half cycle, the control module 400 may control the first upper bridge arm to be turned on or off at a preset frequency, wherein when the first upper bridge arm is turned on, the second upper bridge arm is turned on by a forward voltage applied to an anti-parallel diode of the second upper bridge arm through the power grid AC, and the power grid AC forms a loop with the first upper bridge arm and the second upper bridge arm through the input module 100, so that the power grid AC charges the inductance unit 13.
When the first upper bridge arm is turned off, the second upper bridge arm and the first lower bridge arm are respectively conducted by forward voltages applied to the anti-parallel diodes of the second upper bridge arm and the first lower bridge arm through the power grid AC and the inductance unit 13, and the power grid AC forms a loop with the battery DC through the input module 100, the first lower bridge arm, the second upper bridge arm and the output module 200, so that the power grid AC and the inductance unit 13 charge the battery DC together.
For example, when a user needs to charge an electric vehicle, the user may operate an on-board charger of the electric vehicle according to the corresponding instructions, that is, connect an AC input terminal of the on-board charger to the power grid AC, and connect a DC charging terminal of the on-board charger to the electric vehicle, so as to charge a power battery (battery DC) of the electric vehicle.
The input module 100 in the vehicle-mounted charger receives the alternating current of the grid AC in real time through the first alternating current input terminal 11 and the second alternating current input terminal 12, and when the alternating current of the grid AC is in a positive half-cycle, the control module 400 may output a first control signal to the first IGBT (T1) to control the first IGBT (T1) to be turned on or off. Here, referring to fig. 4 and 6, when the control module 400 controls the first IGBT (T1) to be turned on (i.e., the current flows to the emitter E through the collector C) by outputting the first control signal, the control module 400 may further apply a forward voltage at the gate g of the third IGBT (T3) through the grid AC to control the anti-parallel third diode D3 to be turned on (i.e., the current flows to the cathode through the anode of the anti-parallel third diode D3) to form a loop, so that the grid AC charges the first inductor L1 and the second inductor L2. It should be noted that the forward voltage applied to the third IGBT (T3) described in this embodiment should be greater than the dead zone voltage of the anti-parallel third diode D3.
Referring to fig. 4 and 7, when the control module 400 controls the first IGBT (T1) to turn off by outputting the first control signal, the control module 400 may further apply a forward voltage to the gates g of the third IGBT (T3) and the second IGBT (T2) through the grid AC, the first inductor L1, and the second inductor L2 to control the anti-parallel third diode D3 and the anti-parallel second diode D2 to conduct to form a loop, so that the grid AC, the first inductor L1, and the second inductor L2 charge the power battery of the electric vehicle together through the first dc output terminal 21 and the second dc output terminal 22 of the output module 200 (not shown in fig. 4 and 7). It should be noted that the forward voltage applied across the second IGBT (T2) described in this embodiment should be greater than the dead-zone voltage of the anti-parallel second diode D2.
Further, when the alternating current of the power grid AC is in a negative half cycle, the control module 400 controls the first lower bridge arm to be turned on or off at a preset frequency, wherein when the first lower bridge arm is turned on, the second lower bridge arm is turned on by a forward voltage applied to the anti-parallel diode of the second lower bridge arm through the power grid AC, and the power grid AC forms a loop with the first lower bridge arm and the second lower bridge arm through the input module 100, so that the power grid AC charges the inductance unit 13.
When the first lower bridge arm is turned off, the second lower bridge arm and the first upper bridge arm are respectively conducted by forward voltages applied to the anti-parallel diodes of the second lower bridge arm and the first upper bridge arm through the power grid AC and the inductance unit 13, and the power grid AC forms a loop with the battery DC through the input module 100, the first upper bridge arm, the second lower bridge arm and the output module 200, so that the power grid AC and the inductance unit 13 charge the battery DC together.
For example, when a user needs to charge an electric vehicle, the user may operate an on-board charger of the electric vehicle according to the corresponding instructions, that is, connect an AC input terminal of the on-board charger to the power grid AC, and connect a DC charging terminal of the on-board charger to the electric vehicle, so as to charge a power battery (battery DC) of the electric vehicle.
The input module 100 in the vehicle-mounted charger receives the alternating current of the grid AC in real time through the first alternating current input terminal 11 and the second alternating current input terminal 12, and when the alternating current of the grid AC is in a negative half-cycle, the control module 400 may output a second control signal to the second IGBT (T2) to control the second IGBT (T2) to be turned on or off. Here, referring to fig. 4 and 8, when the control module 400 controls the second IGBT (T2) to conduct by outputting the second control signal, the control module 400 may further apply a forward voltage at the gate g of the fourth IGBT (T4) through the grid AC to control the anti-parallel fourth diode D4 to conduct to form a loop, so that the grid AC charges the first inductor L1 and the second inductor L2. It should be noted that the forward voltage applied to the fourth IGBT (T4) described in this embodiment should be greater than the dead zone voltage of the antiparallel fourth diode D4.
Referring to fig. 4 and 9, when the control module 400 controls the second IGBT (T2) to turn off by outputting the second control signal, the control module 400 may further apply a forward voltage to the gates g of the fourth IGBT (T4) and the first IGBT (T1) through the grid AC, the first inductor L1, and the second inductor L2 to control the anti-parallel fourth diode D4 and the anti-parallel first diode D1 to conduct to form a loop, so that the grid AC, the first inductor L1, and the second inductor L2 charge the power battery of the electric vehicle together through the first dc output terminal 21 and the second dc output terminal 22 of the output module 200 (not shown in fig. 4 and 9). It should be noted that the forward voltage applied across the first IGBT (T1) described in this embodiment should be greater than the dead-band voltage of the anti-parallel first diode D1. Therefore, the first IGBT (T1) and the second IGBT (T2) can be prevented from being in a high-frequency switching state at the same time, and the problem that crosstalk phenomenon is generated between the first IGBT (T1) and the second IGBT (T2) is solved.
In summary, according to the vehicle-mounted charger of the electric vehicle in the embodiment of the invention, the input module receives the ac power of the power grid through the first ac input end and the second ac input end, the output module outputs the dc power to the battery through the first dc output end and the second dc output end to charge the battery, the power conversion module converts the ac power to the dc power, and the control module controls the first upper bridge arm and the first lower bridge arm of the power conversion module to be turned on or off at the preset frequency according to the ac power of the power grid when the power conversion module performs rectification, wherein the second upper bridge arm and the second lower bridge arm of the power conversion module are respectively turned on through forward voltages applied to anti-parallel diodes of the second upper bridge arm and the second lower bridge arm. Therefore, the function of the vehicle-mounted charger can be realized by controlling the first upper bridge arm and the first lower bridge arm and the forward voltages applied to the anti-parallel diodes of the second upper bridge arm and the second lower bridge arm, so that the driving loss and the heat generation of the bridge arms can be reduced, and the user experience can be improved.
In order to implement the embodiment, the invention further provides an electric vehicle, which comprises the vehicle-mounted charger of the electric vehicle.
According to the electric automobile provided by the embodiment of the invention, through the vehicle-mounted charger of the electric automobile, the driving loss and the heating of a bridge arm in the vehicle-mounted charger can be reduced, and the user experience of the vehicle-mounted charger can be improved.
Fig. 10 is a flowchart of a method of controlling an in-vehicle charger of an electric vehicle according to an embodiment of the present invention.
As shown in fig. 10, the method for controlling an onboard charger of an electric vehicle according to an embodiment of the present invention includes the following steps:
and S1, receiving the alternating current of the power grid through the first alternating current input end and the second alternating current input end in the input module.
And S2, converting the alternating current into direct current through the power conversion module, wherein when the power conversion module is used for rectification, the first upper bridge arm and the first lower bridge arm of the power conversion module are controlled to be switched on or switched off at a preset frequency according to the alternating current of the power grid, and the second upper bridge arm and the second lower bridge arm of the power conversion module are respectively switched on through forward voltages applied to anti-parallel diodes of the second upper bridge arm and the second lower bridge arm.
And S3, outputting direct current to the battery through the first direct current output end and the second direct current output end in the output module to charge the battery.
In one embodiment of the invention, when the alternating current of the power grid is in a positive half cycle, the first upper bridge arm is controlled to be switched on or switched off at a preset frequency, wherein when the first upper bridge arm is switched on, the second upper bridge arm is switched on by a forward voltage applied to an anti-parallel diode of the second upper bridge arm through the power grid, and the power grid forms a loop with the first upper bridge arm and the second upper bridge arm through the input module so that the power grid charges an inductance unit in the output module; when the first upper bridge arm is turned off, the second upper bridge arm and the first lower bridge arm are respectively conducted through forward voltages which are applied to anti-parallel diodes of the second upper bridge arm and the first lower bridge arm through the power grid and the inductance unit, and the power grid forms a loop with the battery through the input module, the first lower bridge arm, the second upper bridge arm and the output module, so that the power grid and the inductance unit can charge the battery together.
In one embodiment of the invention, when the alternating current of the power grid is in a negative half cycle, the first lower bridge arm is controlled to be switched on or switched off at a preset frequency, wherein when the first lower bridge arm is switched on, the second lower bridge arm is switched on by a forward voltage applied to an anti-parallel diode of the second lower bridge arm through the power grid, and the power grid forms a loop with the first lower bridge arm and the second lower bridge arm through the input module so that the power grid charges an inductance unit of the input module; when the first lower bridge arm is turned off, the second lower bridge arm and the first upper bridge arm are respectively conducted through forward voltages which are applied to anti-parallel diodes of the second lower bridge arm and the first upper bridge arm through the power grid and the inductance unit, and the power grid forms a loop with the battery through the input module, the first upper bridge arm, the second lower bridge arm and the output module, so that the power grid and the inductance unit can charge the battery together.
It should be noted that, details that are not disclosed in the method for controlling an on-board charger of an electric vehicle according to the embodiment of the present invention are referred to, and details that are disclosed in the on-board charger of an electric vehicle according to the embodiment of the present invention are not repeated herein.
In summary, according to the control method of the on-board charger of the electric vehicle of the embodiment of the invention, the first ac input end and the second ac input end of the input module are used to receive the ac power of the power grid, and then the power conversion module is used to convert the ac power into the dc power, wherein when the power conversion module is used to perform rectification, the first upper bridge arm and the first lower bridge arm of the power conversion module are controlled to be turned on or off at a preset frequency according to the ac power of the power grid, the second upper bridge arm and the second lower bridge arm of the power conversion module are respectively turned on by the forward voltages applied to the anti-parallel diodes of the second upper bridge arm and the second lower bridge arm, and finally the dc power is output to the battery through the first dc output end and the second dc output end of the output module to charge the battery, so that the first upper bridge arm and the first lower bridge arm, and the forward voltages applied to the second upper bridge arm and the second lower bridge arm can be controlled, the function of the vehicle-mounted charger is realized, the driving loss and the heating of a bridge arm can be reduced, and the user experience can be improved.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of 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.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (7)

1. An on-board charger for an electric vehicle, comprising:
the input module comprises a first alternating current input end, a second alternating current input end and an inductance unit, the first alternating current input end and the second alternating current input end are connected with a power grid, and the input module receives alternating current of the power grid through the first alternating current input end and the second alternating current input end;
the output module comprises a first direct current output end and a second direct current output end, the first direct current output end is connected with the positive electrode of the battery of the electric automobile, the second direct current output end is connected with the negative electrode of the battery of the electric automobile, and the output module outputs direct current to the battery through the first direct current output end and the second direct current output end to charge the battery;
the power supply conversion module comprises a first upper bridge arm, a first lower bridge arm, a second upper bridge arm and a second lower bridge arm, wherein a first end of the first upper bridge arm is connected with a first end of the first lower bridge arm and is connected with the second alternating current input end through the inductance unit, a first end of the second upper bridge arm is connected with a first end of the second lower bridge arm and is connected with the first alternating current input end through the inductance unit, a second end of the first upper bridge arm is connected with a second end of the second upper bridge arm and is connected with the first direct current output end, a second end of the first lower bridge arm is connected with a second end of the second lower bridge arm and is connected with the second direct current output end, and the power supply conversion module is used for converting the alternating current into the direct current;
the control module controls the first upper bridge arm and the first lower bridge arm to be switched on or switched off at a preset frequency according to the alternating current of the power grid when the power supply conversion module carries out rectification, wherein the second upper bridge arm and the second lower bridge arm are respectively switched on through forward voltages additionally applied to anti-parallel diodes of the second upper bridge arm and the second lower bridge arm;
when the alternating current of the power grid is in a positive half cycle, the control module controls the first upper bridge arm to be switched on or switched off at the preset frequency, wherein when the first upper bridge arm is switched on, the second upper bridge arm is switched on by a forward voltage applied to an anti-parallel diode of the second upper bridge arm through the power grid, and the power grid forms a loop with the first upper bridge arm and the second upper bridge arm through the input module so as to enable the power grid to charge the inductance unit; when the first upper bridge arm is turned off, forward voltages applied to anti-parallel diodes of the second upper bridge arm and the first lower bridge arm by the power grid and the inductance unit are respectively conducted, the power grid forms a loop with the battery by the input module, the first lower bridge arm, the second upper bridge arm and the output module, and the power grid and the inductance unit charge the battery together;
when the alternating current of the power grid is in a negative half cycle, the control module controls the first lower bridge arm to be switched on or switched off at the preset frequency, wherein when the first lower bridge arm is switched on, the second lower bridge arm is switched on through a forward voltage which is applied to an anti-parallel diode of the second lower bridge arm by the power grid, and the power grid forms a loop with the first lower bridge arm and the second lower bridge arm through the input module so as to enable the power grid to charge the inductance unit; when the first lower bridge arm is turned off, forward voltages applied to anti-parallel diodes of the second lower bridge arm and the first upper bridge arm through the power grid and the inductance unit are respectively conducted, the power grid forms a loop with the battery through the input module, the first upper bridge arm, the second lower bridge arm and the output module, and the power grid and the inductance unit charge the battery together.
2. The on-board charger for electric vehicles according to claim 1,
the first upper bridge arm comprises a first IGBT, an emitter of the first IGBT is used as a first end of the first upper bridge arm, a collector of the first IGBT is used as a second end of the first upper bridge arm, a grid electrode of the first IGBT is connected with the control module, the first IGBT is further provided with a first diode which is connected in an anti-parallel mode, the first IGBT is conducted or disconnected under the action of a first control signal output by the control module, and the first diode is conducted through forward voltage applied to the first diode;
the first lower bridge arm comprises a second IGBT, a collector of the second IGBT is used as a first end of the first lower bridge arm, an emitter of the second IGBT is used as a second end of the first lower bridge arm, a grid electrode of the second IGBT is connected with the control module, the second IGBT is also provided with a second diode which is connected in an anti-parallel mode, the second IGBT is switched on or switched off under the action of a second control signal output by the control module, and the second diode is switched on through a forward voltage applied to the second diode;
the second upper bridge arm comprises a third IGBT, an emitter of the third IGBT is used as a first end of the second upper bridge arm, a collector of the third IGBT is used as a second end of the second upper bridge arm, a grid electrode of the third IGBT is connected with the control module, the third IGBT is further provided with a third diode connected in an anti-parallel mode, the third IGBT keeps being turned off under the action of a third control signal output by the control module, and the third diode is turned on through a forward voltage applied to the third diode;
the second lower bridge arm comprises a fourth IGBT, a collector of the fourth IGBT is used as a first end of the second lower bridge arm, an emitter of the fourth IGBT is used as a second end of the second lower bridge arm, a grid of the fourth IGBT is connected with the control module, the fourth IGBT is further provided with a fourth diode connected in an anti-parallel mode, the fourth IGBT keeps being turned off under the action of a fourth control signal output by the control module, and the fourth diode is turned on through a forward voltage applied to the fourth diode.
3. The vehicle-mounted charger according to claim 2, wherein the first control signal and the second control signal are PWM signals, and the third control signal and the fourth control signal are low level signals.
4. The on-board charger for an electric vehicle according to claim 1, wherein the inductance unit comprises:
one end of the first inductor is connected with the first alternating current input end, and the other end of the first inductor is respectively connected with the first end of the second upper bridge arm and the first end of the second lower bridge arm;
and one end of the second inductor is connected with the second alternating current input end, and the other end of the second inductor is respectively connected with the first end of the first upper bridge arm and the first end of the first lower bridge arm.
5. The on-board charger for electric vehicles according to claim 4,
the input module further comprises a first capacitor connected in parallel between the first alternating current input end and the second alternating current input end;
the output module further comprises a second capacitor, and the second capacitor is connected in parallel between the first direct current output end and the second direct current output end.
6. An electric vehicle characterized by comprising the on-board charger for an electric vehicle according to any one of claims 1 to 5.
7. A control method of an on-board charger of an electric vehicle according to any one of claims 1 to 5, comprising the steps of:
receiving alternating current of a power grid through a first alternating current input end and a second alternating current input end in an input module;
converting the alternating current into direct current through a power conversion module, wherein when the power conversion module is used for rectifying, a first upper bridge arm and a first lower bridge arm of the power conversion module are controlled to be switched on or switched off at a preset frequency according to the alternating current of the power grid, and a second upper bridge arm and a second lower bridge arm of the power conversion module are respectively switched on through forward voltages applied to anti-parallel diodes of the second upper bridge arm and the second lower bridge arm;
outputting the direct current to a battery through a first direct current output end and a second direct current output end in an output module to charge the battery;
when the alternating current of the power grid is in a positive half cycle, controlling the first upper bridge arm to be switched on or switched off at the preset frequency, wherein when the first upper bridge arm is switched on, the second upper bridge arm is switched on through a forward voltage applied to an anti-parallel diode of the second upper bridge arm by the power grid, and the power grid forms a loop with the first upper bridge arm and the second upper bridge arm through the input module so as to enable the power grid to charge an inductance unit in the output module; when the first upper bridge arm is turned off, forward voltages applied to anti-parallel diodes of the second upper bridge arm and the first lower bridge arm by the power grid and the inductance unit are respectively conducted, the power grid forms a loop with the battery by the input module, the first lower bridge arm, the second upper bridge arm and the output module, and the power grid and the inductance unit charge the battery together;
when the alternating current of the power grid is in a negative half cycle, controlling the first lower bridge arm to be switched on or off at the preset frequency, wherein when the first lower bridge arm is switched on, the second lower bridge arm is switched on through a forward voltage applied to an anti-parallel diode of the second lower bridge arm by the power grid, and the power grid forms a loop with the first lower bridge arm and the second lower bridge arm through the input module so as to enable the power grid to charge an inductance unit of the input module; when the first lower bridge arm is turned off, forward voltages applied to anti-parallel diodes of the second lower bridge arm and the first upper bridge arm through the power grid and the inductance unit are respectively conducted, the power grid forms a loop with the battery through the input module, the first upper bridge arm, the second lower bridge arm and the output module, and the power grid and the inductance unit charge the battery together.
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