CN112977120A - Discharging device and discharging method - Google Patents

Discharging device and discharging method Download PDF

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Publication number
CN112977120A
CN112977120A CN201911213382.5A CN201911213382A CN112977120A CN 112977120 A CN112977120 A CN 112977120A CN 201911213382 A CN201911213382 A CN 201911213382A CN 112977120 A CN112977120 A CN 112977120A
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China
Prior art keywords
voltage
direct current
conversion module
power grid
zero
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Pending
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CN201911213382.5A
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Chinese (zh)
Inventor
李小祥
高吉军
马进
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Beijing Electric Vehicle Co Ltd
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Beijing Electric Vehicle Co Ltd
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Priority to CN201911213382.5A priority Critical patent/CN112977120A/en
Publication of CN112977120A publication Critical patent/CN112977120A/en
Pending legal-status Critical Current

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    • 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
    • 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
    • B60L55/00—Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
    • 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)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides a discharging device and a discharging method, which relate to the technical field of charging and discharging, wherein the discharging device comprises: the direct current-direct current conversion module is connected with a power battery of the electric automobile; the direct current-alternating current conversion module is connected with the direct current-direct current conversion module and an external power grid; the zero-crossing detection module is connected with the direct current-alternating current conversion module and a fire/zero line of a power grid; the zero-crossing detection module sends an electric signal representing a discharge instruction to the direct current-alternating current conversion module when detecting that the voltage of electricity is zero, and the direct current-alternating current conversion module discharges electricity to the power grid within a preset time after receiving the electric signal. The scheme of the invention realizes high-power discharge of the electric automobile.

Description

Discharging device and discharging method
Technical Field
The invention relates to the technical field of charging and discharging, in particular to a discharging device and a discharging method.
Background
In the prior art, the electric automobile with the discharging function generally realizes the external discharging action through a vehicle-mounted charger, however, a power battery in the electric automobile is taken as a vehicle-mounted power supply, the size of the power battery is strictly limited, the discharging power is correspondingly limited, the current electric automobile can realize the discharging of 3KW/6KW, the discharging power is smaller, and the discharging time is longer.
Disclosure of Invention
The invention aims to provide a discharging device and a discharging method, so that the problem that the discharging power is low when an electric automobile discharges outwards in the prior art is solved.
In order to achieve the above object, the present invention provides a discharge device comprising:
the direct current-direct current conversion module is connected with a power battery of the electric automobile;
the direct current-alternating current conversion module is connected with the direct current-direct current conversion module and an external power grid;
the zero-crossing detection module is connected with the direct current-alternating current conversion module and a fire/zero line of a power grid;
the zero-crossing detection module sends an electric signal representing a discharging instruction to the direct current-alternating current conversion module when detecting that the voltage of the power grid is zero, and the direct current-alternating current conversion module discharges to the power grid within a preset time after receiving the electric signal.
Optionally, the dc-dc conversion module includes: the control circuit comprises a first control circuit and a main circuit connected with the first control circuit;
the main circuit is used for transmitting the voltage output by the power battery to the direct current-alternating current conversion module;
the control circuit is used for adjusting the electrical characteristic parameter in the main circuit; wherein the electrical characteristic parameter comprises: at least one of output power, output voltage, and output current.
Optionally, the zero-cross detection module periodically collects the voltage of the power grid, and sends the electrical signal to the dc-ac conversion module when the currently collected voltage is a zero point that changes from a low level to a high level.
Optionally, the dc-ac conversion module includes: the execution circuit and the second control circuit are connected with the execution circuit;
the second control circuit is connected with the zero-crossing detection module;
the execution circuit is respectively connected with the direct current-direct current conversion module and the power grid;
and after receiving the electric signal, the second control circuit controls the execution circuit to discharge to the power grid within a preset time.
Optionally, the discharge device further includes:
and the power supply is respectively connected with the direct current-direct current conversion module, the direct current-alternating current conversion module and the zero-crossing detection module.
Optionally, the discharge device further includes:
and the discharge controller is in communication connection with the power supply and the vehicle controller of the electric automobile and is used for performing Controller Area Network (CAN) communication with the vehicle controller.
Optionally, when the vehicle controller performs the CAN communication, the discharge controller is configured to perform the CAN message communication in the handshake stage and the CAN message communication in the discharge stage with the vehicle controller.
The embodiment of the invention also provides a discharging method, which comprises the following steps:
when the input end of the direct current-direct current conversion module is monitored to have voltage input, adjusting the electrical characteristic parameters of the power battery according to the preset voltage of the power grid;
converting the input voltage into a sinusoidal alternating voltage;
and when the voltage of the power grid is detected to be 0V voltage changing from low voltage to high voltage, outputting the sinusoidal alternating voltage to the power grid within a preset time period.
Optionally, before the step of adjusting the electrical characteristic parameter of the power battery according to the preset voltage of the power grid when it is monitored that the voltage is input to the input end of the dc-dc conversion module, the method further includes:
CAN communication with a vehicle controller.
Optionally, the step of performing CAN communication with the vehicle controller includes:
performing CAN communication at a handshake stage with the vehicle controller;
and after the CAN communication in the handshake stage is finished, carrying out the CAN communication in the discharge stage with the vehicle controller.
The technical scheme of the invention at least has the following beneficial effects:
the discharging device provided by the embodiment of the invention is connected with a power battery of an electric automobile through the direct current-direct current conversion module, so that electricity can be directly taken from the power battery, the discharging power is improved, the direct current-direct current conversion module is specifically used for receiving a first direct current voltage output by the power battery and adjusting electrical characteristic parameters of the received direct current voltage to obtain a second direct current voltage, and the direct current-direct current conversion module is connected with the direct current-direct current conversion module to convert the second direct current voltage into an alternating current voltage; the zero-crossing detection module is respectively connected with the power grid and the direct current-alternating current conversion module, so that the voltage on the power grid is monitored in real time, the waveform of the alternating current voltage output by the direct current-alternating current conversion module is ensured to be in the same phase with the waveform of the alternating current voltage on the power grid, and the high-quality power factor is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a discharge device according to an embodiment of the present invention.
Description of reference numerals:
the method comprises the following steps of 1-discharging device, 11-direct current conversion module, 12-direct current-alternating current conversion module, 13-zero-crossing detection module, 14-discharging controller, 15-power supply, 2-electric automobile, 21-power battery, 22-vehicle controller, S1-first switch, S2-second switch and 3-power grid.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a discharging device and a discharging method aiming at the problem that the discharging time is longer due to smaller power when an electric automobile discharges outwards in the prior art, so that the high-power external discharging of the electric automobile is realized, the phase of the output alternating voltage is consistent with that of a power grid, and the high-quality power factor is ensured.
Specifically, please refer to fig. 1, which is a schematic structural diagram of a discharge device according to an embodiment of the present invention, the discharge device includes:
the direct current-direct current conversion module 11 is connected with a power battery 21 of the electric automobile 2;
the direct current-alternating current conversion module 12 is connected with the direct current-direct current conversion module 11 and an external power grid 3;
a zero-cross detection module 13 connected with the dc-ac conversion module 12 and the live/neutral line of the power grid 3;
the zero-crossing detection module 13 sends an electrical signal representing a discharge instruction to the dc-ac conversion module 12 when detecting that the voltage of the power grid 3 is zero, and the dc-ac conversion module discharges to the power grid 3 within a preset time after receiving the electrical signal.
As the name implies, the dc-dc conversion module 11 is configured to adjust an electrical characteristic parameter of the received first dc voltage, such as: voltage, current or power, and the like, so as to obtain a second direct current voltage meeting a preset condition, wherein the preset condition may be a direct current voltage with a certain voltage value; the dc-ac conversion module 12 is configured to convert the received second dc voltage into an ac voltage meeting a requirement of the electrical device, and implement a function from a Vehicle to a power Grid (V2G for short), that is: and outputting the electric energy of the storage battery of the electric automobile to a power grid system.
The discharging device of the embodiment of the invention is connected with the power battery 21 through the direct current-direct current conversion module 11, so that the direct voltage taking from the power battery 21 is realized, and the discharging power is improved; the waveform of the alternating-current voltage on the power grid 3 is detected by the zero-cross detection module 13, and when the waveform of the alternating-current voltage on the power grid 3 is zero, an electric signal representing a discharge instruction is sent to the direct-current-alternating-current conversion module 12, so that the direct-current-alternating-current conversion module 12 supplies power to the power grid 3 within a preset time period, the phase of the alternating-current voltage output by the direct-current-alternating-current conversion module 12 is the same as that of the alternating-current voltage in the power grid 3, and a high-quality power factor is.
Optionally, the dc-dc conversion module 11 includes: the control circuit comprises a first control circuit and a main circuit connected with the first control circuit;
the main circuit is used for transmitting the voltage output by the power battery 21 to the dc-ac conversion module 12;
the control circuit is used for adjusting the electrical characteristic parameter in the main circuit; wherein the electrical characteristic parameter comprises: at least one of output power, output voltage, and output current.
In this embodiment, the dc-dc conversion module 11 is configured to process the acquired voltage in the power battery 21, and output the processed dc voltage to the dc-ac conversion module 12. Therefore, the dc-dc conversion module 11 needs to include a first control circuit for processing the voltage and a main circuit for transmitting the voltage.
The adjusting of the electrical characteristic parameter in the main circuit may be adjusting the electrical characteristic parameter up or adjusting the electrical characteristic parameter down according to requirements. For example, if the voltage required by the power grid 3 is 220V ac voltage and the voltage output by the power battery 21 is 500V dc voltage, the first control circuit needs to perform voltage reduction processing on the 500V dc voltage; the voltage required by the power grid 3 is 380V of alternating current voltage, and the voltage output by the power battery 21 is 200V of direct current voltage, so that the first control circuit needs to perform voltage boosting processing on the 200V of direct current voltage.
Optionally, the zero-cross detection module 13 periodically collects the voltage of the power grid 3, and sends the electrical signal to the dc-ac conversion module 12 when the currently collected voltage is a zero point that changes from a low level to a high level.
In the embodiment of the present invention, in order to ensure that the ac voltage output by the dc-ac conversion module 12 is always in phase with the ac voltage in the power grid 3, the zero-cross detection module 13 periodically collects the voltage in the power grid 3, preferably, the collection frequency is 50kHz, and when the collected voltage in the power grid 3 is not a zero point changing from a low level to a high level, the zero-cross detection module 13 does not operate, that is: no electrical signal is output to the dc-ac conversion module 12; when the collected voltage in the power grid 3 is a zero point that changes from a low level to a high level, the electric signal is output to the dc-ac conversion module 12, so that the dc-ac conversion module 12 outputs an ac voltage to the power grid 3.
Preferably, the dc-ac conversion module 12 includes: the execution circuit and the second control circuit are connected with the execution circuit;
the second control circuit is connected with the zero-crossing detection module 13;
the execution circuit is respectively connected with the direct current-direct current conversion module 11 and the power grid 3;
and after receiving the electric signal, the second control circuit controls the execution circuit to discharge to the power grid 3 within a preset time.
In the embodiment of the present invention, in order to ensure that the ac voltage output by the dc-ac conversion module 12 is always in the same phase as the ac voltage in the power grid 3, so as to ensure a high-quality power factor, the preset time duration is preferably one cycle of the ac voltage in the power grid 3, that is, 0.02 s.
Further, the discharge device further includes:
and the power supply 15 is respectively connected with the direct current-direct current conversion module 11, the direct current-alternating current conversion module 12 and the zero-crossing detection module 13.
The power supply 15 is configured to provide a working voltage for the dc-dc conversion module 11, the dc-ac conversion module 12, and the zero-cross detection module 13, respectively, so that the dc-dc conversion module, the dc-ac conversion module 12, and the zero-cross detection module 13 can work normally.
Further, the discharge device further includes:
and the discharge Controller 14 is in communication connection with the power supply 15 and a vehicle Controller 22 of the electric vehicle 2, and is used for performing Controller Area Network (CAN) communication with the vehicle Controller 22.
The power supply 15 in the present embodiment is also used to provide an operating voltage for the discharge controller 14 to operate normally, thereby communicating with the vehicle controller 22. The discharge controller 14 communicates with the vehicle controller 22 to realize information interaction between the two, and ensure that both meet the charging and discharging requirements.
Preferably, when the CAN communication is performed with the vehicle controller 22, the discharge controller 14 is configured to perform the CAN message communication in the handshake phase and the CAN message communication in the discharge phase with the vehicle controller 22.
Specifically, the process of the CAN message communication in the handshake phase is as follows:
first, the discharge controller 14 sends a Charger Handshake (CHM) message containing a communication protocol version number to the vehicle controller 22;
secondly, the vehicle controller 22 receives the CHM message, and sends a vehicle handshake (BHM) message to the discharge controller 14 after confirming that the communication protocol sent by the discharge controller 14 matches with the communication protocol of itself;
thirdly, after receiving the BHM message, the discharge controller 14 sends a charger identification (CRM) message including a charging pile number, a charging address, and an identification result to the vehicle controller 22, where if the identification is not completed, the sent identification result is 00, and if the identification passes, the sent identification result is AA;
fourth, after receiving the BHM message, the vehicle controller 22 sends a BMS and vehicle identification (BRM) message containing battery electronic information, battery capacity, and battery voltage to the discharge controller 14;
fifthly, after receiving the BRM message, the discharge controller 14 sends the CRM message again, and the identification is passed and the handshake phase is completed.
Specifically, the process of the CAN message communication in the discharging stage is as follows:
firstly, after receiving a CRM message containing passing identification sent by the discharge controller 14, the vehicle controller 22 sends a power Battery Charging Parameter (BCP) message containing battery discharge information, maximum discharge power allowed, maximum discharge current allowed and maximum temperature allowed to the discharge device;
secondly, after receiving the BCP message, the discharge controller 14 sends a time synchronization information (CTS) message to the vehicle controller 22, where the CTS message includes a specific time for discharging;
thirdly, after sending the preset duration of the CTS message, sending a charger maximum output Capacity (CML) message containing the maximum voltage and current that can be received by the dc-dc conversion module to the vehicle controller 22;
fourth, the vehicle controller 22, upon receiving the CML message, sends a battery charge ready status (BRO) message to the discharge controller 14 containing the vehicle is not ready;
fifthly, after sending the BRO message, the vehicle controller 22 controls the first switch S1 and the second switch S2 connected to the power battery 21 to be closed, and sends the BRO message containing the readiness of the vehicle to the discharge controller 14;
at this point, the message communication between the discharge controller 14 and the vehicle controller 22 is finished, and the power battery 21 outputs a dc voltage to the dc-dc conversion module 11, so that the power battery 21 starts to discharge outwards.
In the discharging device of the embodiment of the present invention, the discharging device 14 performs CAN communication with the vehicle controller 22, and after confirming that the electric vehicle 2 is in a discharging ready state, the power battery 21 of the electric vehicle 2 directly outputs a dc voltage to the dc-dc conversion module 11, so as to increase the discharging power, the zero-crossing detection module 13 periodically detects the voltage in the power grid 3, when the power grid 3 is at a zero point that changes from low voltage to high voltage, the zero-cross detection module 13 sends an electrical signal representing a discharge instruction to the dc-ac conversion module 12, so that the dc-ac conversion module 12 discharges to the power grid 3, and it is ensured that the inversion voltage output by the dc-ac conversion module 12 is consistent with the phase of the commercial power in the power grid 3, thereby having a high-quality power factor.
The embodiment of the invention also provides a discharging method, which comprises the following steps:
firstly, when voltage input at the input end of the direct current-direct current conversion module is monitored, adjusting the electrical characteristic parameters of the power battery according to the preset voltage of the power grid;
the step realizes the adjustment of the electrical characteristic parameters of the direct current voltage output by the power battery, and ensures that the voltage output to the power grid is consistent with the alternating current voltage of the power grid on the basis of ensuring the improvement of the output power.
Secondly, converting the input voltage into a sinusoidal alternating voltage;
in this step, since the voltage output by the power battery is a dc voltage, and the electric devices in the power grid 3 need an ac voltage, the dc voltage output by the power battery needs to be converted into a sinusoidal ac voltage in this step.
Thirdly, when the voltage of the power grid is detected to be 0V voltage changing from low voltage to high voltage, the sinusoidal alternating voltage is output to the power grid within a preset time length.
In this step, when the voltage of the power grid is 0V which changes from low voltage to high voltage, the sinusoidal ac voltage is output to the power grid within a preset time period, so that the phase of the output sinusoidal ac voltage is the same as that of the voltage in the power grid, thereby ensuring a high-quality power factor.
Further, before the step of adjusting the electrical characteristic parameter of the power battery according to the preset voltage of the power grid when it is monitored that the voltage is input at the input end of the dc-dc conversion module, the method further includes:
CAN communication with a vehicle controller.
Through CAN communication between the electric vehicle 2 and the discharging device, the related discharging parameters CAN be confirmed, and after the parameters are confirmed, the electric vehicle controls a switch connected with the power battery to be closed, so that the power battery outputs direct-current voltage outwards.
Specifically, the step of performing CAN communication with the vehicle controller includes:
performing CAN communication at a handshake stage with the vehicle controller;
and after the CAN communication in the handshake stage is finished, carrying out the CAN communication in the discharge stage with the vehicle controller.
In this step, the CAN communication at the handshake stage includes: the CAN communication in the handshake stage is completed if the identification result contained in the BRM message is that the identification is passed; the CAN communication during the discharging phase includes: the system comprises a CRM message, a BCP message, a CTS message, a CML message and a BRO message, and after the BRO message contains information that the vehicle is ready to discharge, the vehicle is started to discharge.
According to the discharging method provided by the embodiment of the invention, after the CAN communication with the electric automobile 2 is carried out and the electric automobile 2 is confirmed to be ready to discharge, the direct-current voltage output by the power battery is regulated and converted into the sine alternating-current voltage with the same phase as the power grid voltage, so that the high-quality power factor is ensured and the discharging efficiency is improved on the basis of improving the output power.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. An electric discharge device, comprising:
the direct current-direct current conversion module (11) is connected with a power battery (21) of the electric automobile (2);
the direct current-alternating current conversion module (12) is connected with the direct current-direct current conversion module (11) and an external power grid (3);
the zero-crossing detection module (13) is connected with the direct current-alternating current conversion module (12) and a fire/zero line of the power grid (3);
the zero-crossing detection module (13) sends an electric signal representing a discharge instruction to the direct current-alternating current conversion module (12) when detecting that the voltage of the power grid (3) is zero, and the direct current-alternating current conversion module discharges to the power grid (3) within a preset time after receiving the electric signal.
2. The discharge device according to claim 1, wherein the dc-dc conversion module (11) comprises: the control circuit comprises a first control circuit and a main circuit connected with the first control circuit;
wherein the main circuit is used for transmitting the voltage output by the power battery (21) to the DC-AC conversion module (12);
the control circuit is used for adjusting the electrical characteristic parameter in the main circuit; wherein the electrical characteristic parameter comprises: at least one of output power, output voltage, and output current.
3. The discharge apparatus according to claim 1, wherein the zero-crossing detection module (13) periodically collects the voltage of the power grid (3), and sends the electric signal to the dc-ac conversion module (12) when the currently collected voltage is zero point changing from low level to high level.
4. The discharge device according to claim 1, wherein the dc-ac conversion module (12) comprises: the execution circuit and the second control circuit are connected with the execution circuit;
wherein the second control circuit is connected with the zero-crossing detection module (13);
the execution circuit is respectively connected with the direct current-direct current conversion module (11) and the power grid (3);
and after receiving the electric signal, the second control circuit controls the execution circuit to discharge to the power grid (3) within a preset time.
5. The discharge device according to claim 1, further comprising:
and the power supply (15) is respectively connected with the direct current-direct current conversion module (11), the direct current-alternating current conversion module (12) and the zero-crossing detection module (13).
6. The discharge device according to claim 5, further comprising:
and the discharge controller (14) is in communication connection with the power supply (15) and a vehicle controller (22) of the electric automobile (2) and is used for carrying out controller area network CAN communication with the vehicle controller (22).
7. The discharge device according to claim 6, wherein in CAN communication with the vehicle controller (22), the discharge controller (14) is configured to perform CAN message communication in a handshake phase and CAN message communication in a discharge phase with the vehicle controller (22).
8. A method of discharging, comprising:
when the input end of the direct current-direct current conversion module is monitored to have voltage input, adjusting the electrical characteristic parameters of the power battery according to the preset voltage of the power grid;
converting the input voltage into a sinusoidal alternating voltage;
and when the voltage of the power grid is detected to be 0V voltage changing from low voltage to high voltage, outputting the sinusoidal alternating voltage to the power grid within a preset time period.
9. The discharging method according to claim 8, wherein before the step of adjusting the electrical characteristic parameter of the power battery according to the preset voltage of the power grid when the input voltage of the dc-dc conversion module is monitored, the method further comprises:
CAN communication with a vehicle controller.
10. The discharging method of claim 9, wherein the step of CAN communicating with a vehicle controller comprises:
performing CAN communication at a handshake stage with the vehicle controller;
and after the CAN communication in the handshake stage is finished, carrying out the CAN communication in the discharge stage with the vehicle controller.
CN201911213382.5A 2019-12-02 2019-12-02 Discharging device and discharging method Pending CN112977120A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114678746A (en) * 2021-09-15 2022-06-28 北京新能源汽车股份有限公司 Charging conversion device, charging control method and device and electric vehicle

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Application publication date: 20210618