CN108128176B - Charge-discharge control circuit of electric automobile and charge-discharge connection device of electric automobile - Google Patents

Charge-discharge control circuit of electric automobile and charge-discharge connection device of electric automobile Download PDF

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Publication number
CN108128176B
CN108128176B CN201611100042.8A CN201611100042A CN108128176B CN 108128176 B CN108128176 B CN 108128176B CN 201611100042 A CN201611100042 A CN 201611100042A CN 108128176 B CN108128176 B CN 108128176B
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switch
charging
vehicle
circuit
resistor
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CN108128176A (en
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凌和平
刘长久
王宁
史建勇
郭申发
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BYD Co Ltd
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BYD Co Ltd
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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
    • B60L53/60—Monitoring or controlling charging stations
    • 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
    • B60L53/14—Conductive energy transfer
    • B60L53/16—Connectors, e.g. plugs or sockets, specially adapted for charging electric vehicles
    • 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
    • B60L53/14—Conductive energy transfer
    • B60L53/18—Cables specially adapted for charging electric vehicles
    • 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
    • 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
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles

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

Abstract

The invention is suitable for the automotive electronics field, has provided a charge-discharge control circuit and electric motor car of the electric automobile to charge and discharge the junction device, the circuit includes: switches K1, K2, S2 and resistor RC、RD(ii) a One end of each of K1 and K2 is a charging zero line end and a charging live line end, the other end of each of K1 and K2 is a discharging zero line end and a discharging live line end, the other end of each of K1 and K2 is a zero line end and a live line end of a vehicle connecting port, the charging ground line end and the discharging ground line end are connected with the ground line end of the vehicle connecting port, the ground line end of the vehicle connecting port is further connected with a common end of S2, and a first conducting end and a second conducting end of S2 are connected with an R conducting end andC、RDis connected to one end of RC、RDThe other end of the connecting rod is a detection end of the vehicle connecting port. According to the invention, the charging control box is connected with the charging plug, and meanwhile, the discharging socket is arranged on the charging control box, so that the charging connection function and the discharging connection function are provided, the configuration of the electric automobile is simplified, and the electric automobile is easy to store.

Description

Charge-discharge control circuit of electric automobile and charge-discharge connection device of electric automobile
Technical Field
The invention belongs to the field of automotive electronics, and particularly relates to a charge-discharge control circuit of an electric automobile and a charge-discharge connection device of the electric automobile.
Background
In order to reduce environmental pollution, the use of clean energy is advocated, and electric vehicles are becoming more and more popular, and the electric vehicles are not only power consumers but also can interact with the power grid or loads to a certain extent, i.e. the electric vehicles can be charged or discharged according to the environment, so that the V2G (vehicle-to-grid) technology, the V2L (vehicle-to-load) technology, and the like are derived.
When the electric automobile with the charging and discharging functions is charged, the charging connection device is required to be used for charging through a vehicle interface; when the electric automobile discharges, the discharge connection device is used to discharge electricity through the vehicle interface.
However, in the prior art, both the charging connection device and the discharging connection device of the electric vehicle are installed in the vehicle as the connection devices with independent functions, which causes problems of resource waste, difficult storage of connected products, and the like.
Disclosure of Invention
An embodiment of the present invention provides a charge and discharge control circuit for an electric vehicle, and aims to solve the problems of resource waste and difficult storage caused by the fact that a charge connection device and a discharge connection device of an existing electric vehicle are equipped in a vehicle as a connection device with separate functions.
The embodiment of the invention is realized in such a way that the charge and discharge control circuit of the electric automobile comprises:
switch K1, switch K2, switch S2 and resistor RCResistance RD；
Switch K1 switch K2 'S one end do respectively the zero line end that charges, the live wire end that charges of circuit, switch K1 switch K2' S the other end do respectively the zero line end that discharges, the live wire end that discharges of circuit, switch K1 switch K2 'S the other end still does simultaneously zero line end, the live wire end of the vehicle connection port of circuit, switch K1 switch K2' S control end and electric automobile 'S the control unit radio connection, the ground wire end that charges, the ground wire end that discharges and the vehicle connection port of circuit is connected, the ground wire end of the vehicle connection port of circuit still with switch S2' S public end electricity is connected, switch S2 'S first lead-on end, second lead-on end respectively with resistance R2' S public end electricity is connectedCThe resistor RDIs electrically connected to one end of the resistor RCThe resistor RDThe other end of the first and second switches is simultaneously a detection end of a vehicle connection port of the circuit;
when the switch K1 and the switch K2 are switched on, the electric automobile is controlled to be charged, and electric energy is input into the electric automobile; when the switch K1 and the switch K2 are disconnected, the electric automobile is controlled to discharge, and the high-voltage electricity for the automobile is converted into the commercial power;
the switch S2 controls the resistor RCWhen the electric vehicle is switched on, the control unit of the electric vehicle detects that the electric vehicle is currently charged through the detection end of the vehicle connection portElectrical state and according to said resistance RCJudging the maximum charging current according to the resistance value;
the switch S2 controls the resistor RDWhen the electric automobile is conducted, the control unit of the electric automobile detects that the electric automobile is in a discharging state at present through the detection end of the vehicle connection port and according to the resistor RDThe resistance value of (2) determines the maximum discharge current.
Another object of an embodiment of the present invention is to provide an electric vehicle charging and discharging connection device, including the electric vehicle charging and discharging control circuit, the electric vehicle charging and discharging connection device further including:
the charging control box is embedded with a discharging socket and is also connected with a vehicle plug through a cable, and a switch control part is arranged outside the vehicle plug;
the charging plug is a three-phase electric plug, and a zero line plug-in strip, a live line plug-in strip and a ground line plug-in strip of the charging plug are respectively and correspondingly electrically connected with a charging zero line end, a charging live line end and a charging ground line end of the circuit;
the discharge socket is a three-phase electric socket, and a zero wire groove, a fire wire groove and a ground wire groove of the discharge socket are respectively and correspondingly electrically connected with a discharge zero wire end, a discharge fire wire end and a discharge ground wire end of the circuit;
the vehicle plug is a multi-pin interface, and a plurality of pins of the vehicle plug are respectively and electrically connected with a zero line end, a fire line end, a ground line end and a detection end of the vehicle connection port;
the switch K1, the switch K2 are built in the charging control box, the switch S2, the resistor RCThe resistor RDThe control end of the switch S2 is electrically connected with the switch control component;
when the circuit comprises a charging and discharging condition detection unit, a pin of the vehicle plug is electrically connected with the auxiliary detection end of the vehicle connection port, and the charging and discharging condition detection unit is arranged in the charging control box
According to the embodiment of the invention, the charging control box is connected with the charging plug, and the discharging socket is arranged on the charging control box, and the charging connection function and the discharging connection function are simultaneously realized, so that the charging plug can be used not only when the electric automobile is charged, but also when the electric automobile is discharged, the configuration of the electric automobile is simplified, and the charging plug is simple in structure, convenient to use and easy to store.
Drawings
Fig. 1 is a structural diagram of a charge and discharge control circuit of an electric vehicle according to an embodiment of the present invention;
fig. 2 is a structural diagram of an electric vehicle charging and discharging connection device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the invention connects the live wire, the zero line and the ground wire of the discharging socket in parallel with the output end of the charging control box, so that the charging control box has the charging and discharging connection control function, can be used for charging an electric automobile and discharging the electric automobile, simplifies the configuration of the electric automobile, and has simple structure and convenient use.
Fig. 1 shows a configuration of a charge/discharge control circuit for an electric vehicle according to an embodiment of the present invention, and for convenience of description, only a part related to the present invention is shown.
As an embodiment of the present invention, the charge and discharge control circuit of the electric vehicle includes:
switch K1, switch K2, switch S2 and resistor RCResistance RD；
One ends of the switch K1 and the switch K2 are respectively a charging zero line end N1 and a charging live line end L1 of the circuit, and the other ends of the switch K1 and the switch K2 are respectively a discharging zero line end N2 and a discharging live line end L2 of the circuit2, the other ends of the switch K1 and the switch K2 are a neutral line end N3 and a live line end L3 of a vehicle connection port of the circuit, the control ends of the switch K1 and the switch K2 are in radio connection with a control unit of the electric vehicle, a charging ground end PE1 and a discharging ground end PE2 of the circuit are electrically connected with a ground end PE3 of the vehicle connection port, a ground end PE3 of the vehicle connection port of the circuit is also electrically connected with a common end of the switch S2, and a first conducting end and a second conducting end of the switch S2 are respectively and electrically connected with a resistor RCResistance RDIs electrically connected to one end of a resistor RCResistance RDThe other end of the circuit is also a detection end CC of a vehicle connection port of the circuit;
when the switch K1 and the switch K2 are switched on, the electric automobile is controlled to be charged, and electric energy is input into the electric automobile; when the switch K1 and the switch K2 are disconnected, the electric automobile is controlled to discharge, and the automobile high-voltage electricity is converted into the commercial power;
switch S2 controls resistor RCWhen the electric vehicle is switched on, the control unit of the electric vehicle detects that the electric vehicle is in the charging state at present through the detection end CC of the vehicle connection port and according to the resistor RCJudging the maximum charging current according to the resistance value;
switch S2 controls resistor RDWhen the electric automobile is conducted, the control unit of the electric automobile detects that the electric automobile is in a discharging state at present through the detection end CC of the vehicle connection port and detects that the electric automobile is in the discharging state according to the resistor RDThe resistance value of (2) determines the maximum discharge current.
Preferably, the switch K1 and the switch K2 are both relays. The switch S2 is a toggle switch, a push-button switch, or a push-touch switch.
In a preferred embodiment of the present invention, the switches K1 and K2 may be wirelessly connected to the control unit of the electric vehicle through a wireless communication module.
As a preferred embodiment of the present invention, the charge and discharge control circuit of an electric vehicle further includes:
the charging and discharging condition detection unit 11 is configured to detect whether the electric vehicle currently has a charging condition or a discharging condition, a control end of the charging and discharging condition detection unit is wirelessly connected to a control unit of the electric vehicle, and an output end of the charging and discharging condition detection unit is an auxiliary detection end CP of a vehicle connection port of the circuit.
Further, the charge and discharge condition detection unit 11 includes:
a resistor R1, a switch S1 and a power supply controller 101;
the first output end and the second output end of the power supply controller 101 are respectively electrically connected with the first conducting end and the second conducting end of the switch S1, the common end of the switch S1 is electrically connected with one end of the resistor R1, the other end of the resistor R1 is the output end of the charge and discharge condition detection unit and is electrically connected with the third output end of the power supply controller 101, and the control end of the switch S1 is the control end of the charge and discharge condition detection unit.
As an embodiment of the present invention, the first output terminal of the power supply controller 101 may be configured to output the pwm signal, and the second output terminal of the power supply controller 101 may be configured to output a voltage of 24V ± 1V.
In the embodiment of the invention, the charging port (the charging zero line end N1, the charging live line end L1 and the charging ground line end PE1) is electrically connected with the power supply socket 2 of the power supply equipment of the electric vehicle during charging, the switch K1 and the switch K2 are controlled to be turned off by the control unit of the electric vehicle, electric energy is output to the electric vehicle through the charging port, the switch K1, the switch K2 and the vehicle connection port, at the moment, the discharging port is electrified, and discharging can be carried out through the discharging socket 8a during charging.
When discharging, a user electrically connects an electric appliance with a discharging port (a discharging zero line end N2, a discharging fire line end L2 and a discharging ground line end PE2), a control unit of the electric automobile controls a switch K1 and a switch K2 to be disconnected, a charging port is not electrified, electric energy is output to the electric appliance through a vehicle connecting port and the discharging port, and high voltage of the electric automobile can be reversely converted into household 220V voltage to supply power to the electric appliance.
When the switch S2 is connected with the resistor RCWhen gating is closed, the control unit of the electric automobile can pass through the vehicle connecting port and the detection resistor RCWhether the charging state is the charging state or not is judged by the resistance value of the resistor R, and the charging state can be judged by the resistor RCCalculating the magnitude of the charging current, for example, when the value of 680 Ω is detected, the charging current is less than or equal to 16A, and when the value of 220 Ω is detected, the charging current is less than or equal to 32A;
when the switch S2 is connected with the resistor RDWhen gating is closed, the control unit of the electric automobile can pass through the vehicle connecting port and the detection resistor RDWhether the discharge state is present or not is judged by the resistance value of the resistor R, and the discharge state can be judged by the resistor RDThe magnitude of the discharge current is calculated.
The control unit of the electric automobile can control the switch K1 and the switch K2 to be switched on or switched off according to the magnitude of the charging and discharging current, and the functions of charging control and charging protection are achieved.
In addition, when the switch S1 controls the resistor R1 to connect the pulse width modulation signal (PWM), it indicates that the electric vehicle is ready to be charged, and when the switch S1 controls the resistor R1 to connect the voltage of 24V ± 1V, it indicates that the electric vehicle is not ready to be charged.
The embodiment of the invention connects the live wire, the zero line and the ground wire of the discharging socket in parallel with the output end of the charging control box, so that the charging control box has the charging and discharging connection control function, can be used for charging an electric automobile and discharging the electric automobile, simplifies the configuration of the electric automobile, and has simple structure and convenient use.
Fig. 2 shows a structure of an electric vehicle charge and discharge connecting device according to an embodiment of the present invention, and for convenience of description, only a part related to the present invention is shown.
As an embodiment of the present invention, the charging and discharging connection device for an electric vehicle includes the charging and discharging control circuit for an electric vehicle in any of the above embodiments, and further includes:
the charging control box 8 is embedded with a discharging socket 8a, the charging control box 8 is also connected with a vehicle plug 10 through a cable 6, and a switch control part 10a is arranged outside the vehicle plug 10;
the charging plug 4 is a three-phase electric plug, and a zero line plug-in strip, a live line plug-in strip and a ground line plug-in strip of the three-phase electric plug are respectively and correspondingly electrically connected with a charging zero line end N1, a charging live line end L1 and a charging ground line end PE1 of the circuit;
the discharging socket 8a is a three-phase electric socket, and a zero line slot, a fire line slot and a ground line slot of the three-phase electric socket are respectively and correspondingly electrically connected with a discharging zero line end N2, a discharging fire line end L2 and a discharging ground line end PE2 of the circuit;
the vehicle plug 10 is a multi-pin interface, and a plurality of pins of the vehicle plug are respectively and electrically connected with a neutral line end N3, a live line end L3, a ground line end PE3 and a detection end CC of a vehicle connection port;
the switch K1 and the switch K2 are arranged in the charging control box 8, and the switch S2 and the resistor RCResistance RDBuilt in the vehicle plug 10, the control terminal of the switch S2 is electrically connected to the switch control part 10 a;
when the circuit includes the charge and discharge condition detecting unit 11, one pin of the vehicle plug 10 is electrically connected to the auxiliary detecting terminal CP of the vehicle connection port, and the charge and discharge condition detecting unit 11 is built in the charge control box 8.
Alternatively, the charging plug 4 and the charging control box 8 are connected by the cable 6 or directly.
In the embodiment of the present invention, the charging plug 4 is engaged with the power supply socket 2 of the power supply equipment of the electric vehicle during charging, the vehicle plug 10 is connected with the charging interface 12 of the electric vehicle C (of course, the charging interface 12 is in direct or indirect electrical connection with the control unit of the electric vehicle), the control unit of the electric vehicle controls the switch K1 and the switch K2 to be turned off, electric energy is output to the electric vehicle through the charging plug 4, the switch K1, the switch K2 and the vehicle plug 10, and at this time, the discharging socket 8a is electrified, and discharging can be performed through the discharging socket 8a while charging.
During discharging, a user connects an electric appliance with the discharging socket 8a, the control unit of the electric automobile controls the switch K1 and the switch K2 to be disconnected, the charging plug 4 is not electrified, electric energy is output to the electric appliance through the vehicle plug 10 and the discharging socket 8a, and high-voltage electricity of the electric automobile is reversely converted into household 220V voltage to supply power to the electric appliance.
For the convenience of storage, the discharging socket 8a can be arranged at the position of the charging control box 8 close to the charging plug 4, so that the charging plug 4 is inserted on the discharging socket 8a during storage, and the volume is saved.
The electric vehicle can judge whether it is a charging state or a discharging state by detecting the resistance value through the vehicle plug 10, and calculate the magnitude of the charging/discharging current according to the resistance value. The switch K1 and the switch K2 are controlled to be switched on or switched off according to the magnitude of the charging and discharging current, and the functions of charging control and charging protection are achieved.
In addition, the electric vehicle can detect whether or not the charging condition is satisfied by the CP terminal of the vehicle plug 10, and can be charged.
According to the embodiment of the invention, the charging control box is connected with the charging plug, and the discharging socket is arranged on the charging control box, and the charging connection function and the discharging connection function are simultaneously realized, so that the charging plug can be used not only when the electric automobile is charged, but also when the electric automobile is discharged, the configuration of the electric automobile is simplified, and the charging plug is simple in structure, convenient to use and easy to store.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A charge and discharge control circuit of an electric vehicle, the circuit comprising:
switch K1, switch K2, switch S2 and resistor RCResistance RD；
Switch K1 switch K2 'S one end do respectively the zero line end that charges, the live wire end that charges of circuit, switch K1 switch K2' S the other end do respectively the zero line end that discharges, the live wire end that discharges of circuit, switch K1 switch K2 'S the other end still does simultaneously zero line end, the live wire end of the vehicle connection port of circuit, switch K1 switch K2' S control end and electric automobile 'S the control unit radio connection, the ground wire end that charges, the ground wire end that discharges and the vehicle connection port of circuit is connected, the ground wire end of the vehicle connection port of circuit still with switch S2' S public end electricity is connected, switch S2 'S first lead-on end, second lead-on end respectively with resistance R2' S public end electricity is connectedCThe resistor RDIs electrically connected to one end of the resistor RCThe resistor RDAnother end of (1)Simultaneously is a detection end of a vehicle connection port of the circuit;
when the switch K1 and the switch K2 are switched on, the electric automobile is controlled to be charged, and electric energy is input into the electric automobile; when the switch K1 and the switch K2 are disconnected, the electric automobile is controlled to discharge, and the high-voltage electricity for the automobile is converted into the commercial power;
the switch S2 controls the resistor RCWhen the vehicle is switched on, the control unit of the electric vehicle detects that the electric vehicle is in a charging state at present through the detection end of the vehicle connection port and according to the resistor RCJudging the maximum charging current according to the resistance value;
the switch S2 controls the resistor RDWhen the electric automobile is conducted, the control unit of the electric automobile detects that the electric automobile is in a discharging state at present through the detection end of the vehicle connection port and according to the resistor RDThe resistance value of (2) determines the maximum discharge current.
2. The circuit of claim 1, wherein the switch K1 and the switch K2 are both in radio connection with a control unit of the electric vehicle through a wireless communication module.
3. The circuit of claim 1, wherein the switch K1 and the switch K2 are both relays.
4. The circuit of claim 1, wherein the switch S2 is a toggle switch, a key switch, or a push-to-touch switch.
5. The circuit of claim 1, wherein the circuit further comprises:
the charging and discharging condition detection unit is used for detecting whether the electric automobile has a charging condition or a discharging condition at present, the control end of the charging and discharging condition detection unit is in wireless connection with the control unit of the electric automobile, and the output end of the charging and discharging condition detection unit is an auxiliary detection end of a vehicle connection port of the circuit.
6. The circuit according to claim 5, wherein the charge and discharge condition detecting unit includes:
a resistor R1, a switch S1 and a power supply controller;
the first output end and the second output end of the power supply controller are respectively electrically connected with the first conducting end and the second conducting end of the switch S1, the common end of the switch S1 is electrically connected with one end of the resistor R1, the other end of the resistor R1 is the output end of the charging and discharging condition detection unit is electrically connected with the third output end of the power supply controller, and the control end of the switch S1 is the control end of the charging and discharging condition detection unit.
7. The circuit of claim 6, wherein the first output of the power supply controller outputs a pulse width modulated signal and the second output of the power supply controller outputs a voltage of 24V ± 1V.
8. An electric vehicle charge and discharge connection device, comprising the electric vehicle charge and discharge control circuit according to any one of claims 1 to 7, the electric vehicle charge and discharge connection device further comprising:
the charging control box is embedded with a discharging socket and is also connected with a vehicle plug through a cable, and a switch control part is arranged outside the vehicle plug;
the charging plug is a three-phase electric plug, and a zero line plug-in strip, a live line plug-in strip and a ground line plug-in strip of the charging plug are respectively and correspondingly electrically connected with a charging zero line end, a charging live line end and a charging ground line end of the circuit;
the discharge socket is a three-phase electric socket, and a zero wire groove, a fire wire groove and a ground wire groove of the discharge socket are respectively and correspondingly electrically connected with a discharge zero wire end, a discharge fire wire end and a discharge ground wire end of the circuit;
the vehicle plug is a multi-pin interface, and a plurality of pins of the vehicle plug are respectively and electrically connected with a zero line end, a fire line end, a ground line end and a detection end of the vehicle connection port;
the switch K1, the switch K2 are built in the charging control box, the switch S2, the resistor RCThe resistor RDThe control end of the switch S2 is electrically connected with the switch control component;
when the circuit comprises a charging and discharging condition detection unit, a pin of the vehicle plug is electrically connected with the auxiliary detection end of the vehicle connection port, and the charging and discharging condition detection unit is arranged in the charging control box.
9. The apparatus of claim 8, wherein the charging plug is connected to the charging control box by a cable or directly.
10. The apparatus of claim 8, wherein the charging plug and the discharging receptacle are pluggably positionable when stowed.
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