CN116455244A - Current conversion circuit and current conversion system applied to electric automobile fills electric pile - Google Patents

Current conversion circuit and current conversion system applied to electric automobile fills electric pile Download PDF

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Publication number
CN116455244A
CN116455244A CN202211738711.XA CN202211738711A CN116455244A CN 116455244 A CN116455244 A CN 116455244A CN 202211738711 A CN202211738711 A CN 202211738711A CN 116455244 A CN116455244 A CN 116455244A
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China
Prior art keywords
circuit
transformer
output
voltage
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN202211738711.XA
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Chinese (zh)
Inventor
汪隽迈
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Zhejiang Dianniu Electric Co ltd
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Zhejiang Dianniu Electric Co ltd
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Priority to CN202211738711.XA priority Critical patent/CN116455244A/en
Publication of CN116455244A publication Critical patent/CN116455244A/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • B60L53/20—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 converters located in the vehicle
    • B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • 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
    • Y02T90/12—Electric charging stations

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides a current transformation circuit and a current transformation system applied to an electric automobile charging pile, wherein the current transformation circuit comprises a transformer, a diode rectifying circuit and a chopper circuit which are sequentially connected, the input end of the transformer is used for inputting three-phase alternating voltage, the output end of the transformer is connected with the input end of the diode rectifying circuit, the output end of the diode rectifying circuit is used for outputting first direct voltage, the input end of the chopper circuit is connected with the output end of the diode rectifying circuit, and the output end of the chopper circuit is used for outputting adjustable direct voltage for supplying power to the electric automobile, wherein the transformer is a secondary winding transformer. By adopting the converter circuit, the number of components is greatly reduced, and the output direct-current voltage can be adjusted according to the needs so as to adapt to electric automobiles with different power supply requirements.

Description

Current conversion circuit and current conversion system applied to electric automobile fills electric pile
Technical Field
The invention relates to the technical field of power electronics, in particular to a current transformation circuit and a current transformation system applied to an electric automobile charging pile.
Background
The electric automobile uses battery and direct current as the power source, need charge the stake to charge to the battery regularly, and in prior art, the comparison document 1 (CN 201910039635.5) discloses an electric energy conversion device for electric automobile quick charge, but this kind of scheme has following problem:
the scheme comprises a 12-pulse parallel rectifier formed by three groups of cascaded AC-AC converters, three-winding isolation type transformers, two groups of three-phase diode rectifier bridges and balance resistors, and outputs large current and improves the charging speed of a battery, but the circuit has a large number of switching devices and high use cost.
Disclosure of Invention
Aiming at the problems of multiple switching devices and high use cost of the circuit in the prior art, the invention provides the current transformation circuit and the current transformation system thereof applied to the electric automobile charging pile, which greatly reduce the number of components of the current transformation circuit, and the output direct-current voltage can be adjusted according to the needs so as to adapt to electric automobiles with different power supply requirements.
The invention provides a converter circuit applied to an electric automobile charging pile, which comprises a transformer, a diode rectifying circuit and a chopper circuit which are sequentially connected, and is mainly characterized in that the input end of the transformer is used for inputting three-phase alternating voltage, the output end of the transformer is connected with the input end of the diode rectifying circuit, the output end of the diode rectifying circuit is used for outputting first direct voltage, the input end of the chopper circuit is connected with the output end of the diode rectifying circuit, and the output end of the chopper circuit is used for outputting adjustable direct voltage for supplying power to the electric automobile, wherein the transformer is a secondary winding transformer. After three-phase alternating voltage is input, the power supply can be realized only by the transformer, the diode rectifying circuit and the chopper circuit, and the number of circuit components is greatly reduced. In addition, through the chopper circuit, direct current voltage with constant voltage can be converted into direct current with adjustable voltage to supply power for electric automobiles with different charging demands, and the number of circuit devices is greatly reduced. In addition, through the chopper circuit, direct current voltage with constant voltage can be converted into direct current with adjustable voltage so as to adapt to electric automobiles with different charging demands.
Preferably, the current transformer circuit applied to the electric vehicle charging pile comprises at least two IGBT loops, wherein each IGBT loop is connected in parallel, the input end of each IGBT loop is connected with the output end of the first filter circuit, each IGBT loop comprises an insulated gate bipolar transistor and a first diode, the insulated gate bipolar transistor comprises a gate stage, a collector and an emitter, the first input end of the gate stage is used for inputting a driving signal, the input end of the collector is connected with the output end of the first filter circuit and the cathode of the first diode, the output end of the collector is connected with the second input end of the gate stage, the output end of the gate stage is connected with the input end of the emitter, the output end of the emitter is connected with the anode of the first diode, and the output end of the emitter is the output end of the IGBT loop and is used for outputting a second direct current voltage.
As described above, the present invention converts the dc voltage into the dc voltage with adjustable voltage through the chopper circuit, and this scheme introduces one implementation manner, that is, the gate driving signal of the IGBT loop is controlled to implement the second dc voltage with different magnitudes.
In addition, the chopper circuit comprises at least two IGBT loops, and the limit of the power of the IGBT device is considered, namely, the limit of the peak current which can be born by the IGBT is considered, and each current can safely pass through the IGBT loops by arranging the IGBT loops which are connected in parallel.
Preferably, the invention relates to a converter circuit applied to an electric automobile charging pile, wherein the duration of a driving signal is inversely related to the voltage value of a second direct current voltage. The driving signal of the present invention may include the frequency of the gate on and off, or the time ratio of the switching device on and off, to change the pulse width of the IGBT loop. Generally, the longer the turn-off time of the IGBT loop, the smaller the current, and the smaller the voltage applied to the load, i.e., the drive signal duration is substantially inversely related to the voltage value of the second dc voltage.
Preferably, the current transformer circuit applied to the electric vehicle charging pile further comprises second diodes and second inductors, the number of the second diodes is consistent with that of IGBT loops, the anodes of the second diodes are connected with the output end of the first filter circuit, the cathodes of the second diodes are correspondingly connected with the output end of the IGBT loops, the input end of the second inductors are correspondingly connected with the output end of the IGBT loops, and the output end of the second inductors is used for inputting third direct-current voltage. The voltage stabilizing function of the circuit can be realized through the second diode; in addition, through the arrangement of the second inductor, the alternating current component in the circuit can be further filtered, namely, the isolation function of alternating current signals is realized.
Preferably, the current transformer circuit applied to the electric vehicle charging pile further comprises an LC filter circuit, wherein the input end of the LC filter circuit is connected with the output end of the second inductor, and the output end of the LC filter circuit is used for outputting adjustable direct current voltage. Similarly, the LC filter circuit may also absorb ac interference signals, becoming magnetic induction and thermal energy.
Preferably, the current converting circuit applied to the electric vehicle charging pile is characterized in that the first filter circuit is a capacitance filter circuit or an RC filter circuit. The invention can set a switch on the first filter circuit to realize the selection of different filter circuits.
Preferably, the converter circuit applied to the electric vehicle charging pile provided by the invention has the advantage that the secondary winding transformer is a 12-pulse transformer. Of course, the pulse wave can be selected according to practical requirements, 12 pulse wave rectification is adopted in the invention, namely, two groups of 6 pulse wave direct currents are generated through a phase difference of 30 degrees between two secondary sides of a transformer, and of course, the phase difference between the two groups of waveforms is also 30 degrees. Then, after being taken together, there is one 12 pulses in a 360 cycle.
The invention also provides a current transformation system which comprises at least two paths of the current transformation circuits applied to the electric automobile charging pile, and the current transformation systems are mutually isolated through the secondary winding transformer.
Drawings
Fig. 1 is a schematic diagram of a connection structure of an embodiment 1 of a current transformation circuit applied to an electric vehicle charging pile;
fig. 2 is a schematic diagram of a connection structure of an embodiment 1 of a current transformation circuit applied to an electric vehicle charging pile;
fig. 3 is a schematic diagram of a connection structure of an embodiment 2 of a current transformation circuit applied to an electric vehicle charging pile;
fig. 4 is a schematic diagram of a connection structure of an embodiment 2 of a current transformation circuit applied to an electric vehicle charging pile according to the present invention;
fig. 5 is a schematic diagram of a connection structure of an embodiment 3 of a current transformation circuit applied to an electric vehicle charging pile;
fig. 6 is a schematic diagram of a connection structure of a current transformation system according to the present invention.
1-a transformer; 2-diode rectifying circuit; 3-a first filter circuit; 4-a chopper circuit; 5-gate stage; 6-collector; 7-emitter.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
As described in the background art section, reference 1 discloses an electric energy conversion device applied to rapid charging of an electric automobile, wherein a 12-pulse parallel rectifier is formed by three-winding isolation type transformers, two groups of three-phase diode rectifier bridges and a balance resistor, a large current is output, and the charging speed of a battery is improved, but the number of switching devices involved in the circuit structure is large, and the use cost is high. In view of this, the present invention proposes a converter circuit applied to a charging pile of an electric vehicle, as shown in fig. 1, which is a simplified diagram of the converter circuit of the present invention, including a transformer 1, a diode rectifier circuit 2 and a chopper circuit 4 sequentially connected, where it is noted that the transformer 1 adopted in the present invention is a secondary winding transformer (as shown in fig. 2), and compared with the three windings of the comparative document 1, the diode rectifier circuit 2 and the chopper circuit 4 also adopt fewer devices due to the secondary winding transformer, so as to further reduce the cost, as described in detail below.
In a specific embodiment, in a transformer 1, a diode rectifying circuit 2 and a chopper circuit 4 which are sequentially connected, an input end of the transformer 1 is used for inputting three-phase alternating voltage, an output end of the transformer 1 is connected with an input end of the diode rectifying circuit 2, an output end of the diode rectifying circuit 2 is used for outputting a first direct voltage, an input end of the chopper circuit 4 is connected with an output end of the diode rectifying circuit 2, and an output end of the chopper circuit 4 is used for outputting an adjustable direct voltage for supplying power to an electric automobile, wherein the transformer 1 is a secondary winding transformer.
According to the invention, through the chopper circuit 4, direct current voltage with constant voltage can be converted into direct current with adjustable voltage to supply power for electric automobiles with different charging requirements, so that the number of circuit devices is greatly reduced. In addition, through the chopper circuit 4, the direct current voltage with constant voltage can be converted into direct current with adjustable voltage so as to adapt to electric vehicles with different charging requirements.
Meanwhile, the invention adopts the secondary winding transformer, so that the circuit cost can be greatly reduced, and in addition, the diode rectifying circuit 2 and the chopper circuit 4 adopt fewer devices due to the secondary winding transformer, so that the number of circuit devices is further reduced, and the cost is reduced, as described in detail below.
Example 2
On the basis of embodiment 1, as shown in fig. 3 and 4, a circuit connection structure of a current transformer circuit applied to a charging pile of an electric vehicle according to the present invention is shown, wherein the current transformer circuit 4 includes at least two IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor; hereinafter referred to as IGBT) loops, each IGBT loop is connected in parallel with each other, an input terminal of each IGBT loop is connected to an output terminal of the first filter circuit 3, each IGBT loop includes an insulated gate bipolar transistor and a first diode, the insulated gate bipolar transistor includes a gate 5, a collector 6 and an emitter 7, a first input terminal of the gate 5 is used for inputting a driving signal, an input terminal of the collector 6 is connected to an output terminal of the first filter circuit 3 and a negative electrode of the first diode, an output terminal of the collector 6 is connected to a second input terminal of the gate 5, an output terminal of the gate 5 is connected to an input terminal of the emitter 7, an output terminal of the emitter 7 is connected to a positive electrode of the first diode, and an output terminal of the emitter 7 is an output terminal of the IGBT loop, and is used for outputting a second direct current voltage.
As described above, the present invention converts the dc voltage into a dc voltage with adjustable voltage by the chopper circuit 4, and this scheme introduces one implementation manner, that is, by controlling the gate driving signal of the IGBT loop, to implement the second dc voltage with different magnitude.
In addition, the IGBT circuit is adopted to reduce the reflection voltage of the whole converter circuit, and an MOS tube is not adopted, so that the IGBT circuit is more suitable for being applied to high-power scenes and is more suitable for charging an electric automobile.
Meanwhile, the chopper circuit 4 comprises at least two IGBT loops, and the limit of the power of the IGBT device is considered, namely, the limit of the peak current which can be born by the IGBT is considered, and each current can safely pass through the IGBT loops by arranging the IGBT loops which are connected in parallel.
In a specific embodiment, the invention relates to a converter circuit applied to an electric vehicle charging pile, wherein the duration of a driving signal is inversely related to the voltage value of a second direct current voltage.
The driving signal of the present invention may include the frequency of the gate on and off, or the time ratio of the switching device on and off, to change the pulse width of the IGBT loop. Generally, the longer the turn-off time of the IGBT loop, the smaller the current, and the smaller the voltage applied to the load, i.e., the drive signal duration is substantially inversely related to the voltage value of the second dc voltage. The drive signal duration of the IGBT loop and the voltage value of the second direct current voltage may have a relationship as shown in table 1:
TABLE 1
Duration of drive signal (us) Second DC voltage (V)
3.3 770
5.1 535
7.2 317
In a specific embodiment, the current transformer circuit applied to the electric vehicle charging pile of the invention, the chopper circuit 4 further comprises second diodes and second inductors, the number of the second diodes is consistent with that of the IGBT loops, the anodes of the second diodes are connected with the output end of the first filter circuit 3, the cathodes of the second diodes are correspondingly connected with the output end of the IGBT loops, the input end of the second inductors are correspondingly connected with the output end of the IGBT loops, and the output end of the second inductors is used for inputting third direct current voltage. The voltage stabilizing function of the circuit can be realized through the second diode; in addition, through the arrangement of the second inductor, the alternating current component in the circuit can be further filtered, namely, the isolation function of alternating current signals is realized.
In a specific embodiment, the current transformation circuit applied to the electric vehicle charging pile of the invention, the chopper circuit 4 further comprises an LC filter circuit, an input end of the LC filter circuit is connected with an output end of the second inductor, and an output end of the LC filter circuit is used for outputting an adjustable direct current voltage. Similarly, the LC filter circuit may also absorb ac interference signals, becoming magnetic induction and thermal energy.
In an embodiment, as shown in fig. 3, in one embodiment of the present invention, the current transformer circuit applied to the electric vehicle charging pile may be an RC filter circuit.
Example 3
On the basis of embodiment 2, as shown in fig. 4, the current transformer circuit applied to the electric vehicle charging pile of the present invention, the first filter circuit 3 may also be a capacitive filter circuit.
In a specific embodiment, the invention relates to a converter circuit applied to an electric vehicle charging pile, and a secondary winding transformer is a 12-pulse transformer.
The 12-pulse transformer can convert the high-frequency alternating current input into the transformer into alternating voltage with smaller voltage value, and of course, a 24-pulse transformer can also be adopted in practical application. The number of transformer pulses, the transformer input voltage and the transformer output voltage have the relationship shown in table 2 below:
TABLE 2
Example 4
The invention also provides a current transformation system which comprises at least two paths of the current transformation circuits applied to the electric vehicle charging pile, and the current transformation systems are mutually isolated through the secondary winding transformer.
Through the secondary winding transformer, mutual isolation among the converter circuits can be realized, namely, the output of each converter circuit is mutually isolated, and the mutual influence among the circuits is greatly reduced.

Claims (8)

1. The utility model provides a be applied to electric automobile fills convertor circuit of electric pile, a serial communication port, including transformer (1) that connects in proper order, diode rectifier circuit (2) and chopper circuit (4), the input of transformer (1) is used for the input three-phase alternating voltage, the output of transformer (1) is connected with the input of diode rectifier circuit (2), the output of diode rectifier circuit (2) is used for outputting first direct voltage, the input of chopper circuit (4) is connected with the output of diode rectifier circuit (2), the output of chopper circuit (4) is used for outputting the adjustable direct voltage that supplies power for electric automobile, wherein transformer (1) is the secondary winding transformer, have a primary winding, two or more secondary winding, every secondary winding is electric isolation each other, and only be connected to one diode rectifier circuit (2).
2. The converter circuit for an electric vehicle charging pile according to claim 1, characterized in that the chopper circuit (4) comprises at least two IGBT loops, each IGBT loop being connected in parallel with each other, and the input of each IGBT loop being connected to the output of the first filter circuit (3), each IGBT loop comprising an insulated gate bipolar transistor and a first diode, the insulated gate bipolar transistor comprising a gate stage (5), a collector (6) and an emitter (7), the first input of the gate stage (5) being for inputting a drive signal, the input of the collector (6) being connected to the output of the first filter circuit (3) and to the cathode of the first diode, the output of the collector (6) being connected to the second input of the gate stage (5), the output of the gate stage (5) being connected to the input of the emitter (7), the output of the emitter (7) being connected to the anode of the first diode, and the output of the emitter (7) being for outputting a second direct voltage.
3. The converter circuit of claim 2, wherein the duration of the driving signal is inversely related to the voltage value of the second dc voltage.
4. The converter circuit for the electric vehicle charging pile according to claim 2, wherein the chopper circuit (4) further comprises second diodes and second inductors, the number of the second diodes is consistent with that of the IGBT loops, the anodes of the second diodes are connected with the output end of the first filter circuit (3), the cathodes of the second diodes are correspondingly connected with the output end of the IGBT loops, the input end of the second inductors are correspondingly connected with the output end of the IGBT loops, and the output end of the second inductors is used for inputting third direct current voltage.
5. The converter circuit for an electric vehicle charging pile according to claim 4, wherein the chopper circuit (4) further comprises an LC filter circuit, an input end of the LC filter circuit is connected to an output end of the second inductor, and an output end of the LC filter circuit is used for outputting the adjustable dc voltage.
6. A converter circuit for an electric vehicle charging pile according to claim 2, characterized in that the first filter circuit (3) is a capacitive filter circuit or an RC filter circuit.
7. A converter circuit for use in an electric vehicle charging pile according to any one of claims 1 to 6, wherein the secondary winding transformer is a 12-pulse transformer.
8. A current transformation system, characterized by comprising at least two current transformation circuits applied to electric car charging piles according to any one of claims 1-7, and the current transformation systems are mutually isolated through a secondary winding transformer.
CN202211738711.XA 2022-12-30 2022-12-30 Current conversion circuit and current conversion system applied to electric automobile fills electric pile Withdrawn CN116455244A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211738711.XA CN116455244A (en) 2022-12-30 2022-12-30 Current conversion circuit and current conversion system applied to electric automobile fills electric pile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211738711.XA CN116455244A (en) 2022-12-30 2022-12-30 Current conversion circuit and current conversion system applied to electric automobile fills electric pile

Publications (1)

Publication Number Publication Date
CN116455244A true CN116455244A (en) 2023-07-18

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211738711.XA Withdrawn CN116455244A (en) 2022-12-30 2022-12-30 Current conversion circuit and current conversion system applied to electric automobile fills electric pile

Country Status (1)

Country Link
CN (1) CN116455244A (en)

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