Auxiliary source detection module for charging gun

Abstract

The utility model discloses an auxiliary source detection module for a charging gun, the auxiliary source detection module comprises a diode reverse connection protection input end, a linear voltage regulator, an operational amplifier circuit and a photoelectric coupler, the voltage of an auxiliary power supply is input to the linear voltage regulator through the diode reverse connection protection input end, and then is input to the operational amplifier circuit for amplification; on or off of the photoelectric coupler is controlled according to the voltage output by the operational amplifier; the auxiliary source detection module is connected with an auxiliary source switch control module, the auxiliary source switch control module comprises a triode and a power relay, a base electrode of the triode is connected with the CPU module, a collector electrode of the triode is connected with the power relay, and the CPU module controls the triode to be conducted and further controls the power relay to be closed. According to the utility model, through the auxiliary source detection circuit, the vehicle-mounted auxiliary source can be detected when the charging gun charges.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of charging gun, specifically relates to a charging gun auxiliary source detection module. BACKGROUND

[0002] With the increasingly mature and advanced new energy automobile technology, the charging gun, a key accessory, plays an important role in the field of automobile charging. It is not only the bridge connecting energy and vehicles, but also an important carrier to promote the concept of green travel. The charging gun system control circuit is a key part of the electric vehicle charging system, which ensures the safe and effective transmission of electric energy from the charging pile to the battery of the electric vehicle.

[0003] At present, the technology of charging gun system control circuit is relatively mature. These systems usually include core components such as metering chip, rectifier bridge, optocoupler, MCU master chip, etc. However, there are still some problems: no vehicle-mounted auxiliary power supply detection, different vehicle voltages due to non-uniform electric vehicle standards, resulting in poor compatibility. SUMMARY

[0004] The utility model aims at providing a charging gun system control circuit, which adds an auxiliary source detection circuit to the existing circuit to solve the above problems.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] An auxiliary source detection module for a charging gun includes a diode reverse connection protection input, a linear voltage regulator, an operational amplifier circuit, and a photoelectric coupler. The voltage of the auxiliary power supply is input to the linear voltage regulator through the diode reverse connection protection input, and then amplified by the operational amplifier circuit. The conduction or disconnection of the photoelectric coupler is controlled according to the voltage output by the operational amplifier.

[0007] The auxiliary source detection module is connected to an auxiliary source switch control module, which includes a triode and a power relay. The base of the triode is connected to a CPU module, and the collector is connected to the power relay. The CPU module controls the conduction of the triode, and in turn controls the attraction of the power relay.

[0008] The auxiliary source detection module is also connected to a PDU control module, which introduces a BDR6122H chip to realize PDU control of the auxiliary source. An isolation module is connected before the input of the BDR6122H chip.

[0009] The charging gun control module has the advantages of simple internal circuit, reliability, low cost of micro-control chip in the acquisition control circuit, modular design, reconfigurability, expandability, etc. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 The main structure block diagram of the utility model.

[0011] Figure 2 The circuit diagram of power module.

[0012] Figure 3 The circuit diagram of CPU module.

[0013] Figure 4 The circuit diagram of board temperature sensor.

[0014] Figure 5 The circuit diagram of wired communication - Ethernet.

[0015] Figure 6 The circuit diagram of wireless communication - ESP32.

[0016] Figure 7 The circuit diagram of DC contactor.

[0017] Figure 8 The circuit diagram of power controller.

[0018] Figure 9 The circuit diagram of CAN communication module.

[0019] Figure 10 The circuit diagram of temperature detection module.

[0020] Figure 11 The circuit diagram of auxiliary source detection module.

[0021] Figure 12 The circuit diagram of auxiliary source switch control module.

[0022] Figure 13 The circuit diagram of vehicle-mounted voltage detection module.

[0023] Figure 14 The circuit diagram of CC1 detection module.

[0024] Figure 15 The circuit diagram of return-to-lock detection module.

[0025] Figure 16 The circuit diagram of gun lock control module.

[0026] Figure 17 The circuit diagram of communication isolation module and power isolation module.

[0027] Figure 18 The circuit diagram of insulation detection.

[0028] Figure 19 The circuit diagram of PDU control module.

[0029] Figure 20 The circuit diagram of isolation module.

[0030] Figure 21 PDU power output drive circuit diagram. DETAILED DESCRIPTION

[0031] As Figure 1 shown, the charging gun system control circuit provided by the embodiment comprises a power module, a CPU module, a communication module, a charging gun control module and an insulation detection module; the power module is used to provide working voltage for other modules, the CPU module is connected with the communication module, the charging gun control module and the insulation detection module respectively,

[0032] The power module comprises a DC 12V three-wire input circuit, a 5V voltage stabilizing power supply circuit and a 3.3V voltage stabilizing power supply circuit connected in sequence; as Figure 2 shown, the DC 12V three-wire input circuit comprises a positive electrode (+12V), a negative electrode (-12V) and an additional signal line (PE); the positive electrode (+12V) is connected with a fuse F1 for overcurrent protection; then connected with a varistor U1 for overvoltage protection; then connected with a magnetic bead pair (L1 and L4) for suppressing high-speed pulses; then connected with a diode D1 for preventing input reverse connection; by setting the four protection circuits, stable input power supply is ensured. Then connected with a high-power MOS tube Q1, the voltage is controlled through the high-power MOS tube Q1, the gate of the high-power MOS tube Q1 is connected with a reference voltage, the reference voltage is regulated by two adjustable voltage reference devices U2 and U3, so as to ensure that the MOS tube Q1 is not disturbed by external interference; the maximum output current of the high-power MOS tube Q1 can reach 10A, so as to ensure stable current supply for the subsequent circuit. The 5V voltage stabilizing power supply circuit and the 3.3V voltage stabilizing power supply circuit are both realized by voltage stabilizing chips.

[0033] The CPU module is realized by an ARM Cortex-M4 microcontroller, as Figure 3 shown, the embodiment specifically adopts an STM32F413ZHT6 as the CPU master chip, the STM32F413ZHT6 is an ARM Cortex-M4 microcontroller integrated with a DSP and an FPU; the MCU is equipped with a 1.5MB Flash memory, which provides sufficient space for code and data storage, the maximum CPU frequency can reach 100 MHz, and a rich communication interface is provided, including multiple USART, I2C, SPI, etc., which facilitates communication with other devices. The PB1 pin of the CPU master chip is connected with a temperature sensor RT1, as Figure 4 shown, which is used for temperature detection of the circuit board PCB.

[0034] The communication module is used to establish communication with a remote or mobile device. In this embodiment, the communication module includes a wired network communication module and a wireless network communication module. The wired network communication module uses the U9 Ethernet communication chip, such as... Figure 5 As shown, this embodiment uses the W5500 chip with SPI communication. The W5500 chip integrates a full hardware TCP / IP protocol stack, Ethernet data link layer (MAC) and physical layer (PHY), and supports high-speed standard 4-wire SPI interface for communication with the host. In this embodiment, an RJ45 connector is used to connect the W5500 chip to achieve communication with the host.

[0035] The wireless communication module is implemented using an ESP32 module. The ESP32 module supports both Bluetooth and WiFi communication, enabling easy connection to wireless networks and other Bluetooth devices for remote control and data transmission. Figure 6 As shown.

[0036] The charging gun control module is used to control the charging gun's charging and power-off. In this embodiment, it includes a DC contactor, a power controller, a detection module, and a gun lock control module. The number of charging gun control modules in this embodiment is determined according to the number of guns in the charging pile, and each charging gun is connected to a charging gun control module.

[0037] The DC contactor includes a positive optocoupler, a negative optocoupler, and a relay. Both the positive and negative optocouplers are connected to the relay. The circuit is as follows: Figure 7 As shown, isolation is achieved through an optocoupler, which also provides good electrical insulation and anti-interference capabilities. The connection and disconnection of the positive and negative optocouplers are controlled by a relay. This embodiment has two charging guns, each of which is connected to a DC contactor.

[0038] The power controller consists of four optocouplers and two relays, and the circuit is as follows: Figure 8 As shown, two relays constitute an energy distribution controller for overload protection, short circuit protection, undervoltage protection, overvoltage protection, and temperature protection. When overload, short circuit, undervoltage, overvoltage, or overtemperature occurs in the circuit, the relays can quickly cut off the power supply to protect electrical equipment and personnel safety. Four optocouplers constitute the feedback circuit of the charging gun power distributor, allowing energy to be mutually distributed when the two charging guns are idle. Dynamic energy distribution between the two charging guns improves overall efficiency and meets the charging needs of different electric vehicles, thereby optimizing power distribution and ensuring that each charging gun can provide appropriate charging power according to the specific needs of the connected electric vehicle.

[0039] The detection module includes a CAN communication module, a temperature detection module, an auxiliary source detection module, and an auxiliary source switch control module. Figure 9 The pin 3 and 4 of the CTM1051A module U18 are connected with the CPU module, the pin 6 and 7 are connected with the vehicle through a filter circuit, and the local area network of the charging gun is established through CAN communication, so as to realize the transmission of the detection data of each detection module to the CPU module. Figure 10 As shown in the figure, the temperature detection module of the embodiment includes two groups of temperature sensors (LT1 and LT2), which are connected with the ADC unit of the CPU module through a voltage follower.

[0040] The auxiliary power supply is used to ensure that the charging pile can operate stably in various situations, and even in the case of power failure or main power failure, the charging pile can continue to be powered by a backup battery or a generator, etc. Figure 11 As shown in the figure, the auxiliary source detection module of the application includes diode reverse connection protection input (D50 and D54), linear voltage regulator U12, operational amplifier circuit U11 and photoelectric coupler OC9. The voltage of the auxiliary power supply is input to the linear voltage regulator through the diode reverse connection protection input, and is amplified by the operational amplifier circuit. The on or off of the photoelectric coupler is controlled according to the voltage output by the operational amplifier circuit. When the voltage of the auxiliary power supply is 12V, the operational amplifier circuit outputs a high level of 5V, the photoelectric coupler is turned on, the pin 4 of the photoelectric coupler is at a low level, and the L_ASS_TEST detection is low. Conversely, if there is no voltage input to the auxiliary source, the pin 4 of the photoelectric coupler is at a high level, and the L_ASS_TEST detection is high.

[0041] The auxiliary source switch control module is used to start the power supply according to the result of the auxiliary source detection module. Figure 12 As shown in the figure, it includes a triode Q6 and a power relay K4. The base of the triode Q6 is connected with the CPU module, and the collector is connected with the power relay K4. The CPU module inputs a high level to make the triode Q6 conduct, and the power relay K4 is attracted. The embodiment also connects a diode D52 in parallel with the triode and the power relay to eliminate the reverse electromotive force of the relay. The power relay is connected with the auxiliary power supply, thereby starting the auxiliary power supply and providing a 12V power supply for the vehicle.

[0042] The PDU control module introduces a BDR6122H chip to realize the PDU control of the auxiliary source. Figure 19As shown, the input of BDR6122H chip is connected with isolation module, such as Figure 20 and 21 As shown, when K1+_con1 is high level, K1+_con2 is low level, relay OC5 is opened, and relay OC7 is closed. K1+_IN1 outputs high level, K1+_IN2 outputs low level, K1+_REL- is high level 12V, K1+_REL+ is low level, and magnetic latching relay REL1 is opened. When K1+_con1 is low level, K1+_con2 is high level, relay OC5 is closed, and relay OC7 is opened. K1+_IN1 outputs low level, K1+_IN2 outputs high level, K1+_REL- is low level 12V, K1+_REL+ is high level, and magnetic latching relay REL1 is closed.

[0043] The vehicle-mounted voltage detection module is used for detecting whether there is remaining voltage in the charging process, such as Figure 13 As shown, the application is composed of a triode Q31 and a relay OC38. The base of the triode Q31 is connected with the vehicle-mounted inlet, the relay OC38 is connected with the collector, the relay OC38 is connected with the CPU module, and the vehicle-mounted inlet has electricity, and the relay OC38 is started.

[0044] The CC1 voltage detection module is suitable for detecting the plug-in gun state. In this embodiment, isolation processing is added, and the supply voltage and the detection voltage are isolated by an isolation power supply U37 to realize detection on the plug-in gun state, such as Figure 14 As shown, the isolation power supply U37 outputs L_CC1_12V, and D55 is a power supply indicator. L_CC1_12V supplies power to the operational amplifier U41, and resistors R134 and R133 divide a reference voltage 9.1K / 29.1K*12V=3.7V or so. When there is no plug-in gun, VREF=9V, the relay OC10 U41 outputs high level, L_CC1_TEST1 detects high level, and the CPU module detects that there is no plug-in gun state. Conversely, when the plug-in gun is inserted, CC1 is connected with the vehicle end 500R resistor to the ground. At this time, VREF=3.1V, the relay OC10 U41 outputs low level, L_CC1_TEST1 outputs low level, and it is detected that the plug-in gun is in the state.

[0045] The return-to-lock feedback detection module is used for detecting whether the charging gun is placed in the return-to-lock position, such as Figure 15 As shown, the return-to-lock switch is composed of a relay OC12. When the charging gun is placed in the return-to-lock position, the return-to-lock switch is closed, the relay is turned on, the relay output is low level, and the CPU module detects that the charging gun has been placed in the return-to-lock position.

[0046] The gun lock control circuit introduces a BDR6122T chip U16 and an H-bridge motor forward and reverse rotation circuit, such as Figure 16As shown, the control of the gun lock is locked and unlocked. L_LOCK_CON1 and _LOCK_CON2 are output control ports, and the two ports cannot be high at the same time. If they are high at the same time, the BDR6122T chip may be burned out. The transistors Q7 and Q8 can prevent the two ports from being high at the same time. L_IN1 and L_IN2 are high and low level inputs, and are also controlled by L_EL+ and L_EL- high and low outputs.

[0047] The insulation detection module is used for detecting insulation detection of large voltage and large current, such as Figure 17 As shown, it comprises a communication isolation module and a power supply isolation module. The communication isolation module uses an RSM3485CT isolation chip U27 as a connection with a CPU module. The output end (pin 8~10) of the RSM3485CT isolation chip U27 is connected with a common mode inductor FL3, an interference pulse absorption circuit and a 485 communication impedance circuit in sequence. The common mode inductor FL3 filters common mode interference signals. The interference pulse absorption circuit is composed of diodes D92, D90, D93, D91 and D94, and absorbs external interference pulses. The 485 communication impedance circuit inputs and outputs to the insulation detection interface for communication.

[0048] The power supply isolation module is connected with a power supply module. A 12V power supply is connected with the input end (pin 2) of the isolation module U48 through a resistor R501. The output end (pin 1, 3) of the isolation module U48 is connected with a voltage feedback circuit through a filter circuit and outputs a 5V voltage. The control end (pin 7) of the isolation module U48 is connected with the CPU module, and a control signal (IMD_POW) controls the U48 power on and off functions.

[0049] The insulation detection circuit in the embodiment comprises a positive voltage collector and a negative voltage collector. The positive voltage collector is composed of a solid state relay D1. After a positive voltage (BAT2+) is input, it enters the input end (pin 8) of the solid state relay D1 through resistors (R4, R12). The output end (5, 6, 7) of the solid state relay D1 outputs a positive voltage collection signal (AIN12 and AIN13). The control end (pin 1) of the solid state relay D1 is controlled by the PB11 switch of the CPU module. The (pin 2, 3) of the solid state relay D1 is selected and short-circuited through resistors (R5, R6), so as to realize resistance balance bridge. The negative voltage collector refers to a voltage reverse circuit U1 connected behind the circuit of the positive voltage collector, so as to realize voltage reverse and following functions.

[0050] The embodiment also comprises other control modules of the existing charging gun, such as a serial port screen control module, a lamp control module, a card swiping module and the like. These modules are existing and have not been substantially improved. The embodiment will not be described here.

[0051] The above merely is the preferred embodiment of the present application, but the protection scope of the present application is not limited to this, any modification and replacement based on the technical scheme and the application concept provided by the present application should be covered in the protection scope of the present application.

Claims

1. An auxiliary power source detection module for a charging gun, characterized in that: The auxiliary power supply detection module includes a diode reverse connection protection input terminal, a linear regulator, an operational amplifier circuit, and an optocoupler. The voltage of the auxiliary power supply is input to the linear regulator through the diode reverse connection protection input terminal, and then input to the operational amplifier circuit for amplification. The conduction or disconnection of the optocoupler is controlled according to the voltage output of the operational amplifier. The auxiliary power source detection module is connected to an auxiliary power source switch control module. The auxiliary power source switch control module includes a transistor and a power relay. The base of the transistor is connected to the CPU module, and the collector is connected to the power relay. The CPU module controls the transistor to conduct, thereby controlling the power relay to engage. The auxiliary source detection module is also connected to a PDU control module, which uses a BDR6122H chip to control the auxiliary source via a PDU; an isolation module is connected before the input of the BDR6122H chip.

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