CN111555412A - High-power direct current charging system - Google Patents

High-power direct current charging system Download PDF

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Publication number
CN111555412A
CN111555412A CN202010518460.9A CN202010518460A CN111555412A CN 111555412 A CN111555412 A CN 111555412A CN 202010518460 A CN202010518460 A CN 202010518460A CN 111555412 A CN111555412 A CN 111555412A
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China
Prior art keywords
current
charging
conversion unit
direct current
power conversion
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Pending
Application number
CN202010518460.9A
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Chinese (zh)
Inventor
林晓明
钱斌
肖勇
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CSG Electric Power Research Institute
China Southern Power Grid Co Ltd
Research Institute of Southern Power Grid Co Ltd
Original Assignee
China Southern Power Grid Co Ltd
Research Institute of Southern Power Grid Co Ltd
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Priority to CN202010518460.9A priority Critical patent/CN111555412A/en
Publication of CN111555412A publication Critical patent/CN111555412A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/11—DC charging controlled by the charging station, e.g. mode 4
    • 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
    • B60L53/60—Monitoring or controlling charging stations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • 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
    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • 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
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • 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
    • B60L2210/00—Converter types
    • B60L2210/30—AC to DC converters
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The invention provides a high-power direct-current charging system, which is applied to an electric automobile and comprises a power conversion unit, a direct-current contactor, a main controller and an interaction unit, wherein the power conversion unit is used for converting direct current into direct current; one end of the power conversion unit is used for inputting three-phase alternating current, and the other end of the power conversion unit is connected with the direct current contactor; the interaction unit is connected with the direct current contactor through the main controller; wherein the power conversion unit includes at least one GaN switching device; the power conversion unit is used for converting three-phase alternating current into direct current; the main controller is used for receiving the control instruction input by the interaction unit, instructing the direct current contactor to control the direct current output system to be started according to the control instruction, and charging the electric automobile according to the charging mode of the control instruction. The high-power direct-current charging system improves the output capacity of the charging system, greatly shortens the charging time of the electric automobile, and reduces the charging loss and the volume of the charging system; the stability and the security of the operation and the use of the charging system are guaranteed.

Description

High-power direct current charging system
Technical Field
The invention relates to the technical field of direct current charging, in particular to a high-power direct current charging system.
Background
The development of electric automobiles is an important measure for the sustainable development of energy sources for reducing environmental pollution. In recent years, the quantity of electric vehicles in China is continuously increased, and the quantity of pure electric vehicles in China reaches 310 thousands of vehicles by 2019, but the construction of corresponding charging infrastructures is still not complete. The construction of electric automobile charging infrastructure is accelerated, and the problem of electric automobile charging is solved, so that the electric automobile charging is an important guarantee for the rapid development of electric automobiles. The current electric automobile charging system has the problems of low charging power, long charging time, insufficient safety and the like, and is difficult to meet the quick charging requirement of an electric automobile user and ensure the safety of the user.
Disclosure of Invention
In view of the above, the present invention provides a high-power dc charging system to solve the problems of low charging rate, long charging time and poor safety of the conventional charging system.
A high-power direct-current charging system is applied to an electric automobile and comprises a power conversion unit, a direct-current contactor, a main controller and an interaction unit; one end of the power conversion unit is used for inputting three-phase alternating current, and the other end of the power conversion unit is connected with the direct current contactor; the interaction unit is connected with the direct current contactor through the main controller; wherein the power conversion unit includes at least one GaN switching device;
the power conversion unit is used for converting the three-phase alternating current into direct current;
the main controller is used for receiving a control instruction input by the interaction unit, instructing the direct current contactor to control the direct current output system to be started according to the control instruction, and charging the electric automobile according to the charging mode of the control instruction.
Further, the air conditioner is provided with a fan,
and the main controller is also used for indicating the direct current contactor to control an output system of the direct current to be closed according to the control instruction, and stopping charging the electric automobile.
Further, the air conditioner is provided with a fan,
the power conversion device also comprises a circuit breaker, wherein one end of the circuit breaker inputs three-phase alternating current, and the other end of the circuit breaker is connected with the power conversion unit; the circuit breaker is used for controlling the on or off of the three-phase alternating current input.
Further, the air conditioner is provided with a fan,
the alternating current filter is arranged between the circuit breaker and the power conversion unit;
the alternating current filter is used for filtering the three-phase alternating current.
Further, the air conditioner is provided with a fan,
further comprising: and one end of the surge protector is used for inputting the three-phase alternating current, and the other end of the surge protector is connected with the circuit breaker.
Further, the air conditioner is provided with a fan,
further comprising: a sampling unit; the sampling unit is used for collecting the output voltage and the output current of the power conversion unit and the output system of the direct current and sending the output voltage and the output current to the main controller;
the main controller is used for determining charging state information according to the power conversion unit and the output voltage and the output current of the direct current output system, and sending the charging state information to the interaction equipment for display.
Further, the air conditioner is provided with a fan,
the power supply unit is connected with the main controller.
Further, the air conditioner is provided with a fan,
the GaN switching device includes an AC-DC converter and a DC-DC converter, wherein the AC-DC converter and the DC-DC converter are connected in series.
Further, the air conditioner is provided with a fan,
the AC-DC exchanger is a three-phase Vienna rectifying circuit.
Further, the air conditioner is provided with a fan,
the DC-DC converter is a full-bridge LLC resonant circuit.
The high-power direct-current charging system in the embodiment of the invention comprises a power conversion unit, a direct-current contactor, a main controller and an interaction unit; one end of the power conversion unit is used for inputting three-phase alternating current, and the other end of the power conversion unit is connected with the direct current contactor; the interaction unit is connected with the direct current contactor through the main controller; wherein the power conversion unit includes at least one GaN switching device; the power conversion unit is used for converting three-phase alternating current into direct current; the main controller is used for receiving the control instruction input by the interaction unit, instructing the direct current contactor to control the direct current output system to be started according to the control instruction, and charging the electric automobile according to the charging mode of the control instruction. The GaN switch device has the advantages of low loss, high efficiency, high voltage resistance, good control performance and the like, and can be applied to a power conversion unit to convert alternating current into direct current, so that the output capability of a charging system can be improved, the charging time of an electric automobile can be greatly shortened, and the charging loss and the volume of the charging system can be reduced; in addition, the high-power direct-current charging system is also provided with a main controller, an interaction unit and a direct-current contactor, so that the charging process of the electric automobile can be effectively controlled according to a control instruction, and the stability and the safety of the charging system in operation and use are guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a high-power dc charging system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a high-power DC charging system according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a GaN switching device in an embodiment of the invention;
fig. 4 is a schematic structural diagram of a GaN switching device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to explain the present invention in more detail, a high power dc charging system provided by the present invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a high-power dc charging system applied to an electric vehicle includes a power conversion unit 10, a dc contactor 20, a main controller 30, and an interaction unit 40; one end of the power conversion unit 10 is used for inputting three-phase alternating current, and the other end is connected with the direct current contactor 20; the interaction unit 40 is connected with the direct current contactor 20 through the main controller 30; wherein the power conversion unit 10 includes at least one GaN switching device; the power conversion unit 10 is used for converting three-phase alternating current into direct current; the main controller 30 is configured to receive a control instruction input by the interaction unit 40, instruct the dc contactor 20 to control an output system of the dc power to be turned on according to the control instruction, and charge the electric vehicle according to a charging mode of the control instruction.
In one embodiment, the main controller is further used for instructing the direct current contactor to control the output system of the direct current to be closed according to the control command, and stopping charging the electric automobile.
Among them, the power conversion unit 10 is mainly used to convert three-phase alternating current (usually 380V) into direct current. GaN switching devices, i.e., gallium nitride switching devices, are the closest devices to the ideal semiconductor switch and are fast, low-loss switches.
The power conversion unit 10 is mainly used to convert alternating current into direct current, and the power conversion unit 10 is composed of GaN switching devices, and when the number of GaN switching devices is plural, each GaN switching device is connected in parallel to form the power conversion unit 10. The number of GaN switch devices may be one or more, and the number may be selected according to actual requirements, and is generally determined by the total output power requirement of the high-power dc charging system and the output capability of each GaN switch device, that is
Figure BDA0002531046640000041
Wherein n represents the number of GaN switching devices, p represents the total output power requirement of the high-power DC charging system, and p0Output capability per GaN switching device.
The interaction unit 40 is mainly used for receiving information input by a user or the like, for example, the user may select a charging mode, start and end of charging, and the like. The charging mode generally refers to a charging mode, which includes a fixed charging amount, a fixed charging time, a fixed charging amount, and the like, and these information can be converted into a control command and sent to the main controller 30, and the main controller 30 controls the dc contactor 20 to perform corresponding operations according to the control command. The direct current contactor 20 is installed behind the power conversion unit 10, and is mainly used for realizing on-off control of direct current output, and when the direct current output is started, the electric automobile can be charged, namely, the charging automobile is started to be charged; when the direct current output is turned off (or disconnected), the charging of the electric automobile can be finished, namely, the charging of the charging automobile is finished.
In an alternative embodiment, the interaction unit may be a human-computer interaction interface.
The high-power direct-current charging system in the embodiment of the invention comprises a power conversion unit 10, a direct-current contactor 20, a main controller 30 and an interaction unit 40; one end of the power conversion unit 10 is used for inputting three-phase alternating current, and the other end is connected with the direct current contactor 20; the interaction unit 40 is connected with the direct current contactor 20 through the main controller 30; wherein the power conversion unit 10 includes at least one GaN switching device; the power conversion unit 10 is used for converting three-phase alternating current into direct current; the main controller 30 is configured to receive a control instruction input by the interaction unit 40, instruct the dc contactor 20 to control an output system of the dc power to be turned on according to the control instruction, and charge the electric vehicle according to a charging mode of the control instruction. The GaN switch device has the advantages of low loss, high efficiency, high voltage resistance, good control performance and the like, and can be applied to a power conversion unit to convert alternating current into direct current, so that the output capability of a charging system can be improved, the charging time of an electric automobile can be greatly shortened, and the charging loss and the volume of the charging system can be reduced; in addition, the high-power direct current charging system is further provided with a main controller 30, an interaction unit 40 and a direct current contactor 20, so that the charging process of the electric automobile can be effectively controlled according to a control instruction, and the stability and the safety of the charging system in operation and use are guaranteed.
In one embodiment, as shown in fig. 2, the power converter further includes a circuit breaker 50, one end of the circuit breaker 50 inputs three-phase alternating current, and the other end is connected to the power conversion unit 10; the circuit breaker 50 is used to control the on or off of the three-phase ac power input.
In the present embodiment, the high-power dc charging system further includes a circuit breaker 50, and the circuit breaker 50 is disposed in front of the power conversion unit 10 and mainly used for controlling the on/off of the three-phase ac power input. The device can realize the control of the input of the three-phase alternating current, and when the power conversion unit 10 fails, the device can quickly cut off the input of the three-phase alternating current, so that the safety of the power conversion unit is not ensured.
In one embodiment, as shown in fig. 2, further includes an ac filter 60, the ac filter 60 being disposed between the circuit breaker 50 and the power conversion unit 10; the ac filter 60 is used to filter three-phase ac power.
In the present embodiment, the ac filter 60 is installed between the circuit breaker 50 and the power conversion unit 10, and the ac filter 60 is mainly used to filter three-phase ac power and remove noise.
In one embodiment, as shown in fig. 2, further includes: and one end of the surge protector 70 is used for inputting the three-phase alternating current, and the other end of the surge protector 70 is connected with the circuit breaker 50.
A surge protector, also called a lightning protector, is an electronic device for providing safety protection for various electronic equipment, instruments and meters and communication lines. When the peak current or the voltage is suddenly generated in the electric loop or the communication line due to the external interference, the surge protector can conduct and shunt in a very short time, so that the damage of the surge to other equipment in the loop is avoided. In the present embodiment, the surge protector 70 prevents the surge voltage from damaging the high-power dc charging system of the electric vehicle.
In one embodiment, as shown in fig. 2, further includes: a sampling unit 80; the sampling unit 80 is configured to collect output voltages and output currents of the power conversion unit 10 and the output system of the direct current, and send the output voltages and the output currents to the main controller 30; the main controller 30 is configured to determine charging state information according to the output voltage and the output current of the power conversion unit 10 and the output system of the direct current, and transmit the charging state information to the interactive device 40 for display.
The sampling unit 80 is used for sampling output voltage and current of the power conversion unit 10 and a direct current output system (i.e., a system connected behind the direct current contactor 20), and uploading sampling information to the main control unit; the main controller 30 can determine the charging status information according to the information, and the charging status information is a parameter related to the charging process of the electric vehicle and can reflect the charging status of the electric vehicle. The state-of-charge information includes a charged amount, a money amount time, a vehicle SOC, and the like. The main controller 30 may transmit the charge status information to the interactive device 40, and the interactive device 40 may display the charge status information for viewing by the user.
In one embodiment, as shown in FIG. 2, a power supply unit 90 is further included, and the power supply unit 90 is connected to the main controller 30.
In this embodiment, the high power dc charging system further includes a power supply unit 90, and the power supply unit 90 is connected to the main controller 30 to supply power to the main controller 30.
In one embodiment, as shown in FIG. 3, the GaN switching device 102 includes an AC-DC converter 1022 and a DC-DC converter 1024, where the AC-DC converter 1022 and the DC-DC converter 1024 are connected in series.
As shown in fig. 3, the GaN switching device 102 is formed by an AC-DC converter 1022 and a DC-DC converter 1024 connected in series. The AC-DC converter 1022 is used to convert the input three-phase alternating current into direct current; the DC-DC converter 1024 converts direct current or pulse direct current into stable direct current; the GaN switching device 102 in this embodiment adopts a two-stage series relationship of the AC-DC converter 1022 and the DC-DC converter 1024, and can change the input three-phase alternating current into a stable direct current.
In one embodiment, as shown in FIG. 4, the AC-DC converter is a three-phase Vienna rectifier circuit.
Specifically, the AC-DC converter adopts a three-phase Vienna rectifying circuit, wherein the three-phase Vienna rectifying circuit includes: 3 input terminals (30a, 30b and 30c), 3 input inductances (31), 3 pairs of diodes (32), 3 pairs of bidirectional switches (33), 2 output capacitances (34) and 2 output terminals (35a and 35 b); the input terminals a, b and c are connected with a three-phase alternating current power supply through a circuit breaker and an alternating current filtering unit; each pair of diodes is formed by connecting 2 diodes in series, the anodes of 3 pairs of diodes are connected with each other and are connected with the output terminal a, and the cathodes of 3 pairs of diodes are connected with each other and are connected with the output terminal b; 2 output capacitors are connected in series, the series point is a midpoint, the anode of the output capacitor a is connected with an output terminal a, and the cathode of the output capacitor b is connected with an output terminal b; each pair of bidirectional switches is formed by connecting 2 high-voltage GaN-based transistors in series in an inverted mode; the first terminals of the 3 input inductors are respectively connected with the 3 input terminals, the second terminals of the 3 input inductors are respectively connected with the first terminals of the 3 pairs of bidirectional switches, and the second terminals of the 3 pairs of bidirectional switches are all connected with the midpoint.
In one embodiment, the DC-DC converter is a full bridge LLC resonant circuit, as shown in fig. 4.
Specifically, the DC-DC converter is a full-bridge LLC resonant circuit, wherein the full-bridge LLC resonant circuit includes: 2 input terminals (40a and 40b), 2 output terminals (46a and 46b), a switching network (41), an LLC resonant network (42), a transformer (43), and rectifier filter networks (44 and 45); input terminals a and b of the DC-DC converter are respectively connected with output terminals a and b of the AC-DC converter; the switch network is formed by connecting two bridge arms consisting of 4 GaN switch devices in parallel; the LLC resonant network (42) consists of a resonant capacitor Cr, a resonant inductor Lr and an excitation inductor Lm, wherein the resonant capacitor Cr is connected with the resonant inductor Lr in series and then connected with the excitation inductor Lm in parallel; the rectifying filter networks (44 and 45) are composed of 4 diodes and filter capacitors; the output terminals a and b of the DC-DC converter are connected with a charger interface.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A high-power direct-current charging system is applied to an electric automobile and is characterized by comprising a power conversion unit, a direct-current contactor, a main controller and an interaction unit; one end of the power conversion unit is used for inputting three-phase alternating current, and the other end of the power conversion unit is connected with the direct current contactor; the interaction unit is connected with the direct current contactor through the main controller; wherein the power conversion unit includes at least one GaN switching device;
the power conversion unit is used for converting the three-phase alternating current into direct current;
the main controller is used for receiving a control instruction input by the interaction unit, instructing the direct current contactor to control the direct current output system to be started according to the control instruction, and charging the electric automobile according to the charging mode of the control instruction.
2. The high-power direct-current charging system according to claim 1, wherein the main controller is further configured to instruct the direct-current contactor to control an output system of the direct current to be turned off according to the control command, so as to stop charging the electric vehicle.
3. The high-power direct-current charging system according to claim 2, further comprising a circuit breaker, wherein one end of the circuit breaker inputs three-phase alternating current, and the other end of the circuit breaker is connected with the power conversion unit; the circuit breaker is used for controlling the on or off of the three-phase alternating current input.
4. The high power dc charging system according to claim 3, further comprising an ac filter disposed between said circuit breaker and said power conversion unit;
the alternating current filter is used for filtering the three-phase alternating current.
5. The high power dc charging system of claim 4, further comprising: and one end of the surge protector is used for inputting the three-phase alternating current, and the other end of the surge protector is connected with the circuit breaker.
6. The high power dc charging system according to any of claims 1-5, further comprising: a sampling unit; the sampling unit is used for collecting the output voltage and the output current of the power conversion unit and the output system of the direct current and sending the output voltage and the output current to the main controller;
the main controller is used for determining charging state information according to the power conversion unit and the output voltage and the output current of the direct current output system, and sending the charging state information to the interaction equipment for display.
7. The high power direct current charging system according to claim 6, further comprising a power supply unit, wherein said power supply unit is connected to said main controller.
8. The high power DC charging system of claim 7, wherein said GaN switching device comprises an AC-DC converter and a DC-DC converter, wherein said AC-DC converter and said DC-DC converter are connected in series.
9. The high power DC charging system of claim 8, wherein said AC-DC converter is a three-phase Vienna rectifier circuit.
10. The high power DC charging system of claim 9, wherein the DC-DC converter is a full bridge LLC resonant circuit.
CN202010518460.9A 2020-06-09 2020-06-09 High-power direct current charging system Pending CN111555412A (en)

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Application Number Priority Date Filing Date Title
CN202010518460.9A CN111555412A (en) 2020-06-09 2020-06-09 High-power direct current charging system

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102185329A (en) * 2011-05-04 2011-09-14 华北电力大学 Super-capacitor-based DC voltage sag suppression device and suppression method thereof
CN104935314A (en) * 2014-03-17 2015-09-23 英飞凌科技奥地利有限公司 Operational gallium nitride devices
CN106314190A (en) * 2016-09-27 2017-01-11 南京理工大学 Intelligent direct-current charging pile
CN107453462A (en) * 2017-09-06 2017-12-08 广东万城万充电动车运营股份有限公司 A kind of High-reliability large-power DC charging motor
CN110014934A (en) * 2018-01-08 2019-07-16 深圳市网源电气有限公司 A kind of integral type is double to fill direct-current charging post

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102185329A (en) * 2011-05-04 2011-09-14 华北电力大学 Super-capacitor-based DC voltage sag suppression device and suppression method thereof
CN104935314A (en) * 2014-03-17 2015-09-23 英飞凌科技奥地利有限公司 Operational gallium nitride devices
CN106314190A (en) * 2016-09-27 2017-01-11 南京理工大学 Intelligent direct-current charging pile
CN107453462A (en) * 2017-09-06 2017-12-08 广东万城万充电动车运营股份有限公司 A kind of High-reliability large-power DC charging motor
CN110014934A (en) * 2018-01-08 2019-07-16 深圳市网源电气有限公司 A kind of integral type is double to fill direct-current charging post

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