A charging control circuit of a new energy direct current charging all-in-one machine

Abstract

The utility model discloses a new energy direct current charging integrated machine's charging control circuit, and the circuit includes main control module, power module, mode switching module, direct current output socket, direct current charging gun and CAN bus communication module, mode switching module is connected with main control module and power module respectively, and direct current output socket is connected with power module and mode switching module respectively, and direct current charging gun is connected with main control module, power module and mode switching module respectively, and CAN bus communication module is connected with main control module, power module and direct current charging gun respectively. The utility model discloses through main control module to mode switching module to direct current output socket and direct current charging gun are carried out mode switching, thereby can realize new energy automobile whole car charging and the battery pack charging of dismantling, reduce new energy automobile maintenance cost, improve maintenance efficiency, satisfy the electricity demand of diversified new energy automobile maintenance.

Description

Technical Field

[0001] This utility model relates to the field of new energy charging circuit technology, and in particular to a charging control circuit for a new energy DC charging integrated machine. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the demand for charging equipment in maintenance scenarios is becoming increasingly diversified. Currently, there are two main charging scenarios in the new energy vehicle maintenance field:

[0003] 1. Vehicle Charging Scenarios: Traditional DC charging piles (such as GB / T 27930 interface equipment) achieve fast charging of the vehicle battery pack through vehicle interfaces (such as CCS, CHAdeMO). Their technical principle is based on the SECC protocol (Supply Equipment Communication Control) and the ISO15118 standard, interacting with the vehicle's BMS (Battery Management System) via a CAN bus to achieve constant current and constant voltage charging control. The output voltage range of these charging piles is typically 200-1000V, with a current up to 400A and a maximum charging power of 480kW.

[0004] 2. Battery Pack / Module Charging Scenarios: When the battery pack or module is removed from the vehicle, it needs to be charged offline using dedicated charging equipment. This equipment must support direct electrical connections to the battery pack (such as high-voltage connectors) and have battery balancing management functions (such as active current sharing and switched capacitor balancing technology). However,

[0005] Existing DC charging piles (such as standard DC charging guns) only have interfaces compatible with the vehicle's interface and cannot directly connect to the high-voltage connectors of the battery pack. In other words, existing DC charging piles only support charging new energy vehicles and cannot charge disassembled battery packs or modules individually. This necessitates the use of multiple charging devices during new energy vehicle repairs, leading to high repair costs, reduced efficiency, and an inability to meet repair needs. Therefore, there is an urgent need for a charging control circuit for an integrated DC charging machine for new energy vehicles that can charge both the entire vehicle and the battery pack / module, to meet these repair requirements. Utility Model Content

[0006] The purpose of this invention is to address the aforementioned problems by providing a charging control circuit for a new energy DC charging integrated machine. According to the main control module of this invention, the DC output socket and DC charging gun are switched via a mode switching module, thereby enabling the charging of the entire new energy vehicle and the charging of the removed battery pack, reducing the maintenance cost of new energy vehicles, improving maintenance efficiency, and meeting the diverse power needs of new energy vehicle maintenance.

[0007] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0008] According to one aspect of this utility model, a charging control circuit for a new energy DC charger is provided, comprising:

[0009] Main control module;

[0010] Power module;

[0011] A mode switching module is connected to both the main control module and the power module.

[0012] A DC output socket, which is connected to both the power module and the mode switching module.

[0013] A DC charging gun, which is connected to the main control module, the power module and the mode switching module respectively;

[0014] A CAN bus communication module is connected to the main control module, the power supply module, and the DC charging gun.

[0015] Preferably, the main control module includes a main control chip, which is connected to the mode switching module and the CAN bus communication module respectively.

[0016] Preferably, the power module includes a DC / DC unit and an AC / DC unit, wherein the DC / DC unit is connected to the AC / DC unit, and the AC / DC unit is connected to the mode switching module.

[0017] Preferably, it further includes a buck regulator unit, which includes a buck regulator chip and is connected to the DC / DC unit.

[0018] Preferably, the mode switching module includes a relay and a transistor. The relay is connected to the power module, the DC output socket, the DC charging gun, and the transistor, respectively. The transistor is connected to the main control module.

[0019] Preferably, the CAN bus communication module includes a CAN bus transceiver, which is connected to the main control module and the power supply module respectively.

[0020] Preferably, it also includes a serial port display screen, which is connected to the main control module.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0022] This invention uses a main control module and a mode switching module to switch the DC output socket and DC charging gun modes, thereby enabling the charging of the entire new energy vehicle and the charging of the removed battery pack, reducing the maintenance cost of new energy vehicles, improving maintenance efficiency, and meeting the diverse power needs of new energy vehicle maintenance. Attached Figure Description

[0023] Figure 1 This is the circuit schematic diagram of the main control module of this utility model;

[0024] Figure 2 This is the circuit schematic diagram of the crystal oscillator module of this utility model;

[0025] Figure 3 This is the circuit schematic diagram of the DC / DC unit of this utility model;

[0026] Figure 4 This is the circuit schematic diagram of the AC / DC unit of this utility model;

[0027] Figure 5 This is the circuit diagram of the step-down voltage regulator circuit of this utility model;

[0028] Figure 6 This is a circuit schematic diagram of the CAN bus communication module of this utility model;

[0029] Figure 7 This is the circuit diagram of the serial port display screen of this utility model. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of the utility model, and these aspects can be achieved even without these specific details.

[0031] Please see Figures 1 to 7 This utility model provides a charging control circuit for a new energy DC charging integrated machine, the technical solution of which is as follows:

[0032] A charging control circuit for a new energy DC charger includes a main control module, a power supply module, a mode switching module, a DC output socket, a DC charging gun, and a CAN bus communication module. Figure 1As shown, the main control module includes a main control chip, model STM32F103C8T6. The main control chip integrates a 32-bit ARM Cortex-M3 core with a clock speed of 72MHz, and has 128KB of Flash and 20KB of SRAM. It supports communication protocols such as CAN bus and UART. The main control chip has 48 pins. Pins 5 and 6 of the main control chip are connected to a crystal oscillator module, such as... Figure 2 As shown, the crystal oscillator module includes crystal oscillator X1. One end of crystal oscillator X1 is connected to pin 5 of the main control chip, and the other end is connected to pin 6 of the main control chip. The node connecting crystal oscillator X1 to pin 5 of the main control chip is grounded through capacitor C1. The node connecting crystal oscillator X1 to pin 6 of the main control chip is grounded through capacitor C11. Crystal oscillator X1 provides a stable clock signal to the main control chip.

[0033] like Figure 3-4 As shown, the power module includes a DC / DC unit and an AC / DC unit. The DC / DC unit is existing technology; it connects to 220V AC power and converts it to 5V and 12V DC power, providing DC voltage to various components. The AC / DC unit is also existing technology, featuring built-in short-circuit, overcurrent, and overvoltage protection, with an output voltage accuracy of ±2%. The voltage input terminal of the AC / DC unit is connected to the 12V output of the DC / DC unit. The voltage output terminal of the AC / DC unit is connected to a mode switching module. Furthermore, a buck regulator circuit is also included. Figure 5 As shown, the buck regulator circuit includes a buck regulator chip U4, model AMS1117-2.5. Pin 3 of the buck regulator chip U4 is connected to the 12V output of the DC / DC unit, and pin 2 is the output pin, with an output voltage of 3.3V. The buck regulator chip U4 converts 12V to 3.3V to provide a stable DC voltage for the main control chip.

[0034] like Figure 4As shown, the mode switching module includes a relay and a transistor. Relay RLY1 has five pins. Pin 1 of relay RLY1 is connected to the 12V output of the DC / DC unit. Pin 2 of relay RLY1 is connected to the positive DC voltage output of the AC / DC unit via fuse F1. A 100A / 250V glass-sealed fuse F1 is connected in series at the positive DC output. When the current exceeds the rated value, the fuse blows within 10ms, cutting off the circuit and protecting it. Pin 3 of relay RLY1 is connected to the positive DC voltage output of the DC output socket. The DC output socket is used to charge the battery pack. Pin 4 of relay RLY1 is connected to the collector of transistor Q3. Pin 5 of relay RLY1 is connected to the positive DC voltage output of the DC charging gun. The base of transistor Q3 is connected to pin 25 of the main control chip via resistor R50. The main control chip controls the switching on and off of transistor Q3, thereby controlling the operation of the relay. The negative DC voltage output terminal of the DC output socket is connected to the negative DC voltage output terminal of the AC / DC unit. The DC output socket is used to output DC voltage to charge the battery pack. The negative DC voltage output terminal of the DC charging gun is connected to the negative DC voltage output terminal of the AC / DC unit. The CC1 pin of the DC charging gun is connected to pin 12 of the main control chip through resistor R52. The DC charging gun is used to directly connect to new energy vehicles to charge them. The main control chip switches between the DC output socket and the DC charging gun via a mode switching module to meet different charging needs and improve applicability. The microcontroller drives the relay to switch the circuit path by controlling the base voltage of the transistor. A freewheeling diode D11 is connected in parallel across the relay coil to prevent damage to components from back electromotive force during power-off.

[0035] like Figure 6As shown, the CAN bus communication module includes a CAN bus transceiver U2, model number TJA1050T-JSM. Pin 1 of the CAN bus transceiver U2 is connected to pin 33 of the main control chip. Pin 4 of the CAN bus transceiver U2 is connected to pin 32 of the main control chip. Pins 6 and 7 of the CAN bus transceiver U2 are connected to the AC / DC unit. Pin 6 of the CAN bus transceiver U2 is connected to the CANL pin of the DC charging gun. Pin 7 of the CAN bus transceiver U2 is connected to the CANH pin of the DC charging gun. The main control chip communicates with the CAN bus transceiver U2 through its RX and TX pins to achieve real-time monitoring of the AC / DC unit. The CAN bus transceiver U2 acts as a communication bridge between the main control chip and the AC / DC unit; its TX pin is connected to the TX pin of the main control chip, and its RX pin is connected to the RX pin of the main control chip. The CANH and CANL pins of the CAN bus transceiver U2 are shorted by a 120Ω terminating resistor R3 to match the bus impedance. At the same time, a bidirectional TVS diode, model SMBJ5.0A, is connected in parallel to prevent ±5kV electrostatic discharge from damaging the chip.

[0036] For ease of operation, this embodiment also includes a serial port display screen, such as... Figure 7 As shown, the TX and RX pins of the serial port display are connected to pins 33 and 32 of the main control chip, respectively. The main control chip, connected to the serial port display, can receive user mode selection commands. The serial port display uses a 5V powered TTL interface (such as a USART2 interface), supports a resolution of 480×272, and switches its operating mode by sending ASCII commands (such as "AT+MODE=1"). The display backlight is controlled by the PA1 pin of the main control chip, and its brightness is adjustable.

[0037] The working principle of this invention is as follows: When a new energy vehicle needs to be charged, the DC charging gun of the integrated DC charger is inserted into the charging interface of the new energy vehicle. The main control chip detects the CC1 signal, triggers the charging handshake process, and communicates with the vehicle's BMS to obtain the current battery status (such as SOC, voltage, maximum allowable charging current, etc.). Based on the data provided by the BMS, the main control chip controls the base voltage of the transistor, drives the relay to switch the circuit path, and connects the DC charging gun to the power module to charge the entire vehicle. During the charging process, parameters such as charging voltage, current, and temperature are monitored in real time to ensure a safe and efficient charging process.

[0038] When the removed battery pack needs to be charged, connect the removed battery pack to the DC charging socket of the all-in-one machine through the dedicated battery pack interface. The main control chip controls the base voltage of the transistor, drives the relay to switch the circuit path, connects the DC charging socket and the power module, and charges the battery pack.

[0039] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A charging control circuit for a new energy DC charger, characterized in that, include: Main control module; Power module; A mode switching module is connected to both the main control module and the power module. A DC output socket, which is connected to both the power module and the mode switching module. A DC charging gun, which is connected to the main control module, the power module and the mode switching module respectively; A CAN bus communication module is connected to the main control module, the power supply module, and the DC charging gun.

2. The charging control circuit of a new energy DC charging integrated machine according to claim 1, characterized in that: The main control module includes a main control chip, which is connected to the mode switching module and the CAN bus communication module.

3. The charging control circuit of a new energy DC charging integrated machine according to claim 1, characterized in that: The power module includes a DC / DC unit and an AC / DC unit, the DC / DC unit being connected to the AC / DC unit, and the AC / DC unit being connected to the mode switching module.

4. The charging control circuit of a new energy DC charging integrated machine according to claim 3, characterized in that: It also includes a buck regulator unit, which includes a buck regulator chip and is connected to the DC / DC unit.

5. The charging control circuit of a new energy DC charging integrated machine according to claim 1, characterized in that: The mode switching module includes a relay and a transistor. The relay is connected to the power module, the DC output socket, the DC charging gun and the transistor respectively. The transistor is connected to the main control module.

6. The charging control circuit of a new energy DC charging integrated machine according to claim 1, characterized in that: The CAN bus communication module includes a CAN bus transceiver, which is connected to the main control module and the power supply module respectively.

7. The charging control circuit of a new energy DC charging integrated machine according to claim 1, characterized in that: It also includes a serial port display screen, which is connected to the main control module.

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