Portable electric vehicle charging device

Abstract

The utility model discloses a portable electric automobile charging device, include: power socket, mutual inductor, switching circuit, charging gun line, residual current detection circuit, auxiliary power supply, detection circuit, CP circuit, microprocessor circuit, button circuit, temperature detection circuit and display circuit, this charging device can carry along with the car, need not professional electrician installation, can realize convenient charging in the place of three -hole 16A socket, 10A socket, industrial plug.

Description

Technical Field

[0001] This utility model relates to the technical field of electric vehicle charging devices, specifically to a portable electric vehicle charging device. Background Technology

[0002] With the increasing popularity of electric vehicles, the portability and practicality of charging devices, as core supporting equipment, are receiving growing attention. Currently, most AC charging stations on the market are fixed structures, typically requiring installation by professional electricians, and can only be used to charge electric vehicles in specific locations, significantly limiting user flexibility. Therefore, it is necessary to propose a portable electric vehicle charging device to address these issues. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a portable electric vehicle charging device, thereby solving the problem that existing electric vehicle charging devices can only be fixed in a specific location to charge electric vehicles, which limits the user's flexibility.

[0004] This utility model provides a portable electric vehicle charging device, including: a power socket, a current transformer, a switching circuit, a charging gun cable, a residual current detection circuit, an auxiliary power supply, a detection circuit, a CP circuit, a microprocessor circuit, a button circuit, a temperature detection circuit, and a display circuit. The power socket has input lines Li, Ni, and PE; the charging gun line has charging gun lines Lo, No, PE, and CP signal lines; input lines Li and Ni pass through the sensor magnetic ring, transformer, and switch circuit of the residual current detection circuit and are connected to charging gun lines Lo and No; input line PE is connected to charging gun line PE; the auxiliary power input is connected to input lines Li and Ni, and the output is connected to the microprocessor circuit. The residual current detection circuit is connected to the microprocessor circuit; the input terminal of the detection circuit is connected to the current transformer, and the output terminal is connected to the microprocessor circuit; the switch circuit is connected to the microprocessor circuit; one end of the CP circuit is connected to the CP signal line of the charging gun, and the other end is connected to the microprocessor circuit for communication; the button circuit, temperature detection circuit, and display circuit are connected to the microprocessor circuit.

[0005] Furthermore, the current transformer and the detection circuit constitute a current detection circuit and a voltage detection circuit, which detect the voltage and current status data of the portable electric vehicle charging device and transmit them to the microprocessor circuit.

[0006] Furthermore, the switching circuit controls the connection and disconnection between the power socket input and the charging gun line, connecting or disconnecting the AC power supply for electric vehicle charging.

[0007] Furthermore, the microprocessor circuit detects the charging process status of the electric vehicle through the CP circuit and transmits the charging parameters of the portable electric vehicle charging device, thereby realizing information interaction between the portable electric vehicle charging device and the electric vehicle charging process.

[0008] Furthermore, the residual current detection circuit detects the AC and DC leakage current of the portable electric vehicle charging device, and when AC and / or DC leakage occurs, it cuts off the switching circuit and stops charging the electric vehicle.

[0009] Furthermore, the maximum output current value of the portable electric vehicle charging device is set via a button circuit according to the load capacity of the input power supply, thereby limiting the output power of the portable electric vehicle charging device and thus limiting the maximum charging power of the electric vehicle. The display circuit displays the charging parameters of the portable electric vehicle charging device.

[0010] Furthermore, the temperature detection circuit detects the temperature at key heat-generating locations of the portable electric vehicle charging device.

[0011] This utility model offers the following advantages: The portable electric vehicle charging device provided by this utility model can be conveniently connected to the power grid using 16A, 10A, or industrial plugs. It uses a charging gun to replenish the electric vehicle's power, and the charging power of the charging gun can be manually set according to the maximum load capacity of the power supply. The device integrates multiple temperature detection circuits to monitor the temperature of different areas of the control device in real time. Combined with control strategies, it appropriately reduces the charging current when the temperature is too high, limiting the device's temperature rise and ensuring the safe operation of the entire device. The device also integrates multiple fault detection circuits to monitor whether the device's voltage and current parameters are within safe ranges and whether the device is grounded in real time, ensuring the safety of the entire device. The device allows users to select different charging currents and schedule charging times, providing convenient personalized options. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the portable electric vehicle charging device of this utility model. Figure 2 It is an auxiliary power supply circuit; Figure 3 It is a residual current detection circuit; Figure 4 It is a switching circuit; Figure 5 These are detection circuits, where (a) is a voltage detection circuit and (b) is a current detection circuit; Figure 6 It is a CP circuit. Detailed Implementation

[0014] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be pointed out that the following detailed description is illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0015] Please see Figures 1 to 6 This utility model provides a portable electric vehicle charging device, including: a power socket, a current transformer, a switching circuit, a charging gun cable, a residual current detection circuit, an auxiliary power supply, a detection circuit, a CP circuit, a microprocessor circuit, a button circuit, a temperature detection circuit, and a display circuit.

[0016] The power socket has input lines Li (Live Line), Ni (Neutral Line), and PE (Protective Earth). The charging gun line has charging gun line Lo (Live Output Line), charging gun line No (Neutral Output Line), charging gun line PE (Protective Earth), and charging gun line CP (Control Pilot Signal Line). Input lines Li and Ni pass through the sensor magnetic ring, current transformer, and switching circuit of the residual current detection circuit and are then connected to charging gun lines Lo and No. Input line PE is connected to charging gun line PE. The auxiliary power input is connected to input lines Li and Ni, and the output is connected to the microprocessor circuit. The residual current detection circuit is connected to the microprocessor circuit; the input terminal of the detection circuit is connected to the current transformer, and the output terminal is connected to the microprocessor circuit; the switching circuit is connected to the microprocessor circuit; one end of the CP circuit is connected to the CP signal line of the charging gun, and the other end is connected to the microprocessor circuit for communication; the button circuit, temperature detection circuit, and display circuit are connected to the microprocessor circuit. Power from the power supply passes through the residual current detection, current transformer, and switching circuit, and is then delivered to the electric vehicle via the charging gun line to replenish its power.

[0017] Specifically, the auxiliary power supply circuit provides auxiliary power to the microprocessor circuit, CP circuit, detection circuit, and switching circuit. The auxiliary power supply circuit is connected to the input power sockets Li and Ni, providing low-voltage power to the switching circuit, microprocessor circuit, CP circuit, residual current sensor, and other circuits. Please refer to [link / reference]. Figure 2 The auxiliary power supply includes fuse F1, NTC1, varistor RV1, safety capacitor CX2, filter inductor L1, safety capacitor CX1, Y capacitor C8, Y capacitor C9, 12V switching power supply circuit U1, electrolytic capacitor EC2, capacitor C6, ±12V DC-DC power supply circuit U2, electrolytic capacitor EC1, electrolytic capacitor EC7, capacitor C1, capacitor C7, electrolytic capacitor EC3, capacitor C2, 5V DC-DC power supply circuit U14, electrolytic capacitor EC6, capacitor C3, electrolytic capacitor EC4, capacitor C4, and 3.3V DC-DC power supply circuit U12, electrolytic capacitor EC5, capacitor C5.

[0018] Specifically, the leakage current passes through the magnetic ring of the residual current detection circuit. The coil converts the leakage current signal into a voltage signal, which is then transmitted to the microprocessor circuit via an operational amplifier. The residual current detection sensor provides leakage protection for the entire charging device, including both DC and AC leakage. The residual current detection circuit detects both AC and DC leakage current in the portable electric vehicle charger. In the event of AC and / or DC leakage, it disconnects the switching circuit, stopping charging the electric vehicle. Please refer to [link to relevant documentation]. Figure 3 The residual current detection system includes a residual current sensor U7, resistors R23, Q4, R25, R27, R29, R26, R28, Q5, and capacitor C23. Power input lines Li and Ni pass through the magnetic ring of the residual current sensor. The emitter of transistor Q4 is connected to the other end of resistor R26 and then to the microprocessor I / O port to test the status of the residual current sensor. The collector of transistor Q5 is connected to one end of resistor R28 and the other end of capacitor C23 and then to the microprocessor I / O port to detect the leakage current status of the device.

[0019] Specifically, the switching circuit controls the connection and disconnection between the power socket input and the charging gun cable, thus connecting or disconnecting the AC power supply for electric vehicle charging. Please refer to [link / reference]. Figure 4 The switching circuit controls the on / off state of the relays, connecting or disconnecting the AC power supply for electric vehicle charging. The switching circuit consists of relays RL1 and RL2, diodes D4 and D5, transistors Q2 and Q3, and resistors R19, R20, R21, and R22. The microprocessor controls the relays to turn on and off via signals DO0 and DO1. The microprocessor circuit sends signals to transistors Q2 and Q3 to control the on / off state of relays RL1 and RL2, thus turning the charging gun's power output on or off.

[0020] Specifically, the current transformer and the detection circuit constitute a current detection circuit and a voltage detection circuit, which detect the voltage and current status data of the portable electric vehicle charging device and transmit them to the microprocessor circuit. See also... Figure 5 The detection circuit includes a voltage detection circuit and a current detection circuit, which detect the power supply voltage and charging current in real time and transmit the data to the microprocessor circuit to provide overvoltage, undervoltage, and overcurrent protection functions for the device. (a) is the voltage detection circuit, and (b) is the current detection circuit. The voltage detection circuit consists of resistors R32, R33, R31, and R35, voltage transformer U10, resistors R41, R42, R30, and R31, operational amplifier U11A, diode D8, resistor R40, operational amplifier U11B, and capacitor C13. The current detection circuit consists of current transformer U13, diode D9, resistors R43, R50, and R51, operational amplifier U8A, resistor R52, and capacitor C26. The input voltage of the voltage detection circuit is divided by resistors R32-R35, processed by the voltage transformer and operational amplifier, and then transmitted to the microprocessor circuit. Current flows through the magnetic ring of the current transformer in the current detection circuit. The transformer coil converts the current signal into a voltage signal, which is then processed by the operational amplifier and transmitted to the microprocessor circuit.

[0021] Specifically, the microprocessor circuit detects the charging status of the electric vehicle through the CP circuit and transmits the charging parameters of the portable electric vehicle charger, enabling information exchange between the portable electric vehicle charger and the electric vehicle charging process. The CP circuit is connected to the charging gun cable CP, transmitting the device's communication signals and simultaneously returning vehicle status signals. The microprocessor circuit sends a level signal via PWM_CP and sends the CP_AD signal returned by the CP circuit to the microprocessor circuit; please refer to [link to relevant documentation]. Figure 6 The CP circuit consists of two series-connected diodes D1, capacitor C10, resistor R4, operational amplifier U3A, capacitor C11, resistor R3, resistor R6, transistor Q1, resistors R1 and R5, diode D3, resistor R9, resistor R13, capacitor C12, operational amplifier U3B, capacitor C15, and two series-connected diodes D2. The PWM signal for the CP circuit is generated by the microprocessor circuit via PWM_CP and sent to the CP terminal through the operational amplifier for communication with the vehicle's CP. The CP circuit determines the connection status between the charging gun and the electric vehicle by detecting the signal at the CP terminal and feeds back the connection status signal to the microprocessor circuit through the operational amplifier.

[0022] Specifically, the maximum output current of the portable electric vehicle charger is set via a button circuit based on the load capacity of the input power supply, limiting the output power of the portable electric vehicle charger and thus limiting the maximum charging power of the electric vehicle. The display circuit shows the charging parameters of the portable electric vehicle charger. A temperature detection circuit detects the temperature of key heat-generating locations on the portable electric vehicle charger.

[0023] This charging device is portable and requires no professional electrician installation. It can be conveniently charged anywhere with a 16A three-prong socket, a 10A socket, or an industrial plug. One end of the device connects to the power grid via a power plug or industrial plug, while the other end connects to the electric vehicle via the charging gun cable. After a reliable connection between the charging gun and the electric vehicle, the microprocessor circuit communicates with the electric vehicle via the CP circuit and the charging gun, sending a PWM signal to determine the charging control circuit to provide charging power. The electric vehicle communicates with the microprocessor circuit via the charging gun, the CP circuit, and the CP detection circuit, returning a connection confirmation signal.

[0024] When the charging control circuit receives the start charging command, the microprocessor circuit confirms the power supply voltage through the voltage detection circuit in the detection circuit, confirms the over-temperature state through the temperature protection circuit and the over-temperature protection circuit, and sends a command to enable the switch control circuit, closes the switch in the switch circuit, and thus outputs electrical energy to the charging gun, thereby replenishing the electric vehicle with electrical energy.

[0025] The start / stop modes of this device are as follows: Plug-in / unplug start / stop: After the charging device is powered on and the charging gun is reliably connected to the electric vehicle, the microprocessor circuit communicates with the electric vehicle by sending a PWM signal through the CP circuit and the charging gun to determine the charging control circuit to provide charging power. The electric vehicle communicates with the microprocessor circuit through the charging gun, CP circuit, and CP detection circuit, and returns a connection confirmation signal.

[0026] The microprocessor circuit confirms the power supply voltage through the voltage detection circuit in the detection circuit, confirms the over-temperature state through the temperature protection circuit and the over-temperature protection circuit, sends a command to enable the switch control circuit, closes the switch in the switch circuit, and outputs electrical energy to the charging gun, thereby replenishing the electric vehicle with electrical energy.

[0027] During the charging process, the vehicle is unlocked, the user disconnects the charging gun from the vehicle's mechanical connection, the CP detection circuit communicates with the microprocessor circuit, and returns a charging termination signal. The microprocessor circuit then sends a command to the switch control circuit to disconnect the switch in the switch circuit, thus disconnecting the output power to the charging gun and stopping the replenishment of power to the electric vehicle.

[0028] Display screen operation for timed charging: When the power is turned on, the user can select scheduled charging by operating the buttons on the device. After confirming the scheduled charging time, the charging gun is reliably connected to the electric vehicle. The microprocessor circuit communicates with the electric vehicle by sending a PWM signal through the CP circuit and the charging gun to determine the charging power provided by the charging control circuit. The electric vehicle communicates with the microprocessor circuit through the charging gun, CP circuit, and CP detection circuit, and returns a connection confirmation signal.

[0029] The microprocessor circuit confirms the power supply voltage through the voltage detection circuit in the detection circuit, and confirms the over-temperature state through the temperature protection circuit and the over-temperature protection circuit. After the timer reaches the user-set time, it sends a command to enable the switch control circuit, closes the switch in the switch circuit, and outputs electrical energy to the charging gun, thereby replenishing the electric vehicle's power.

[0030] During the charging process, the vehicle is unlocked, the user disconnects the charging gun from the vehicle's mechanical connection, the CP detection circuit communicates with the microprocessor circuit, and returns a charging termination signal. The microprocessor circuit then sends a command to the switch control circuit to disconnect the switch in the switch circuit, thus disconnecting the output power to the charging gun and stopping the replenishment of power to the electric vehicle.

[0031] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A portable electric vehicle charging device, characterized in that, include: Power socket, current transformer, switching circuit, charging gun cable, residual current detection circuit, auxiliary power supply, detection circuit, CP circuit, microprocessor circuit, button circuit, temperature detection circuit and display circuit; The power socket has input lines Li, Ni, and PE; the charging gun line has charging gun lines Lo, No, PE, and CP signal lines; input lines Li and Ni pass through the sensor magnetic ring, transformer, and switch circuit of the residual current detection circuit and are connected to charging gun lines Lo and No; input line PE is connected to charging gun line PE; the auxiliary power input is connected to input lines Li and Ni, and the output is connected to the microprocessor circuit. The residual current detection circuit is connected to the microprocessor circuit; the input terminal of the detection circuit is connected to the current transformer, and the output terminal is connected to the microprocessor circuit; the switch circuit is connected to the microprocessor circuit; one end of the CP circuit is connected to the CP signal line of the charging gun, and the other end is connected to the microprocessor circuit for communication; the button circuit, temperature detection circuit, and display circuit are connected to the microprocessor circuit.

2. The portable electric vehicle charging device as described in claim 1, characterized in that, The current transformer and the detection circuit constitute a current detection circuit and a voltage detection circuit, which detect the voltage and current status data of the portable electric vehicle charging device and transmit them to the microprocessor circuit.

3. The portable electric vehicle charging device as described in claim 1, characterized in that, The switching circuit controls the connection and disconnection between the power socket input and the charging gun line, connecting or disconnecting the AC power supply for electric vehicle charging.

4. The portable electric vehicle charging device as described in claim 1, characterized in that, The microprocessor circuit detects the charging status of the electric vehicle through the CP circuit and transmits the charging parameters of the portable electric vehicle charging device, thereby realizing information interaction between the portable electric vehicle charging device and the electric vehicle charging process.

5. The portable electric vehicle charging device as described in claim 1, characterized in that, The residual current detection circuit detects the AC and DC leakage current of the portable electric vehicle charging device. When AC and / or DC leakage occurs, it cuts off the switching circuit and stops charging the electric vehicle.

6. The portable electric vehicle charging device as described in claim 1, characterized in that, The maximum output current value of the portable electric vehicle charging device is set by the button circuit according to the load capacity of the input power supply, thereby limiting the output power of the portable electric vehicle charging device and thus limiting the maximum charging power of the electric vehicle. The display circuit displays the charging parameters of the portable electric vehicle charging device.

7. The portable electric vehicle charging device as described in claim 1, characterized in that, The temperature detection circuit detects the temperature at key heat-generating locations of the portable electric vehicle charging device.

Images