Novel power battery charging module

Abstract

The utility model relates to the technical field of power battery charging, and discloses a novel power battery charging module, which comprises a main power circuit, a system control board and an auxiliary power supply, and is characterized in that the main power circuit comprises an input EMI (Electro-Magnetic Interference) filter circuit, a PFC (Power Factor Correction) rectification booster circuit, an LLC (Logical Link Control) full-bridge inverter circuit, a rectification filter circuit and a DSP (Digital Signal Processor) control circuit; the input end of the PFC rectifying and boosting circuit is connected into a power grid through the input EMI filter circuit, the output end of the PFC rectifying and boosting circuit is connected with the LLC full-bridge inverter circuit, and the output end of the LLC full-bridge inverter circuit outputs direct-current voltage to a power battery through the rectifying and filtering circuit. The system control board is in signal connection with the main power circuit and the BMS, the input end of the auxiliary power supply is connected with the output end of the PFC rectification booster circuit, and the output end of the auxiliary power supply is connected with the system control board and the BMS.

Description

Technical Field

[0001] This utility model relates to the field of power battery charging technology, and in particular to a novel power battery charging module. Background Technology

[0002] With breakthroughs in battery technology, the global new energy market has begun to develop rapidly. China's new energy vehicle market has seen a tremendous leap, growing from 6,000 units produced and sold annually in 2011 to 9.5 million units in 2023. With continuous advancements in core technologies such as power batteries, and the widespread application of intelligent and automated equipment, the new energy industry is developing towards high-end, intelligent, and clustered development. Current power battery charging systems include a main control system board, a human-machine interface unit (touchscreen), an auxiliary power supply (powering the main control system board, battery BMS, and system fan), input / output relays, a main power charging module, and low-voltage control wiring harnesses. Due to the large number of components, the overall charging system is overly complex and lacks integration, leading to difficult assembly, high labor costs, and a large overall size. For example, some DC charging modules on the market require an external system main control board when assembled into charging cabinets (charging piles) to connect to the human-machine interface (touchscreen), necessitating numerous internal wiring harnesses. This increases labor costs and failure rates. An external auxiliary power supply is also needed to power the display screen and BMS. Since the auxiliary power supply is directly connected to the power grid, and due to cost and size limitations, it lacks a PFC (Power Factor Correction) circuit, the input current waveform and input voltage waveform are mismatched due to harmonic interference and low power factor, generating a large amount of harmonics. Harmonics not only pollute the power grid and affect the normal operation of other electrical equipment, but the introduction of harmonic interference from the power grid into the power supply without a PFC circuit can lead to instability in the entire system, causing fluctuations, noise, and even, in severe cases, damage to equipment. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a new type of highly integrated power battery charging module.

[0004] The technical solution of this utility model is as follows: a novel power battery charging module, including a main power circuit, the main power circuit including an input EMI filter circuit, a PFC rectifier boost circuit, an LLC full-bridge inverter circuit, a rectifier filter circuit and a DSP control circuit. The input terminal of the PFC rectifier boost circuit is connected to the power grid through the input EMI filter circuit, the output terminal of the PFC rectifier boost circuit is connected to the LLC full-bridge inverter circuit, the output terminal of the LLC full-bridge inverter circuit outputs a DC voltage to the BMS through the rectifier filter circuit, and the DSP control circuit controls the switching transistors of the LLC full-bridge inverter circuit by modulating a PWM signal, thereby controlling the magnitude of the output DC voltage.

[0005] The system control board is connected to the main power circuit and the BMS signal respectively, and is used to control the main power circuit to charge the battery through the BMS and receive the information reported by the main power circuit.

[0006] An auxiliary power supply is provided, with its input terminal connected to the output terminal of the PFC rectifier boost circuit, and its output terminal connected to both the system control board and the BMS.

[0007] As can be seen from the above scheme, the main power circuit is used to convert AC power into stable DC power and supply it to charge the battery. The PFC rectifier boost circuit is used to adjust the input current waveform of the power supply to make it closer to a sine wave and synchronize it with the input voltage waveform, thereby reducing energy loss during the conversion process and improving the power supply's efficiency. The rectifier filter circuit is used to convert DC voltage into stable DC voltage. This utility model uses a built-in auxiliary power supply, the output terminal of which is connected to the system control board and the BMS respectively, eliminating the need for an external auxiliary power supply. The auxiliary power supply is connected to the output terminal of the PFC rectifier boost circuit, making the input source more stable and controllable, improving the reliability of the entire system. The PFC rectifier boost circuit reduces the harmonic current generated by the power supply, which can significantly improve the power grid quality, reduce power grid losses, and improve the power grid transmission efficiency.

[0008] The system control board uses a BL0550 isolated power supply.

[0009] The system control board is connected to the main power circuit via 485 communication, and the system control board is connected to the BMS via CAN bus.

[0010] The system control board is electrically connected to a human-machine interaction module, which uses a touch screen display.

[0011] The auxiliary power supply uses an AC-DC controller. Attached Figure Description

[0012] Figure 1 This is a connection diagram of this utility model;

[0013] Figure 2 This is the circuit schematic for 485 communication;

[0014] Figure 3 This is a circuit schematic diagram for CAN communication;

[0015] Figure 4 This is the circuit diagram of the auxiliary power supply;

[0016] Figure 5 This is the circuit diagram of the auxiliary power supply.

[0017] Figure 6 This is the circuit schematic of the input EMI filter circuit;

[0018] Figure 7 This is the circuit schematic of a PFC rectifier boost circuit;

[0019] Figure 8 This is the circuit schematic of an LLC full-bridge inverter circuit. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0021] like Figures 1 to 8 As shown, this utility model is a novel power battery charging module, including a main power circuit. The main power circuit includes an input EMI filter circuit 1, a PFC rectifier boost circuit 2, an LLC full-bridge inverter circuit 3, a rectifier filter circuit 4, and a DSP control circuit 5. The input terminal of the PFC rectifier boost circuit 2 is connected to the power grid through the input EMI filter circuit 1. The output terminal of the PFC rectifier boost circuit 2 is connected to the LLC full-bridge inverter circuit 3. The output terminal of the LLC full-bridge inverter circuit 3 outputs a DC voltage to the BMS6 through the rectifier filter circuit 4. The P control circuit 5 controls the switching transistors of the LLC full-bridge inverter circuit 3 by modulating the PWM signal, thereby controlling the magnitude of the output DC voltage; the system control board 7 is connected to the main power circuit and the BMS6 signal respectively, and is used to control the main power circuit to charge the battery 10 through the BMS6 and receive the reported information from the main power circuit; the auxiliary power supply 8 has its input terminal connected to the output terminal of the PFC rectifier boost circuit 2, and its output terminal connected to the system control board 7 and the BMS6 respectively.

[0022] The system control board 7 uses a BL0550 isolated power supply, the auxiliary power supply 8 uses an AC-DC controller, the system control board 7 is connected to the main power circuit via 485 communication, the system control board 7 is connected to the BMS6 via a CAN bus, and the system control board 7 is electrically connected to a human-machine interaction module 9, which uses a touch screen. In this embodiment, the main control board 7 uses a BL0550 isolated power supply and an isolated CAN communication bus to achieve isolation between the CAN interface and the main power circuit. The main control board 7 also uses a BL0550 isolated power supply and isolated 485 communication to achieve isolation between the 485 interface and the human-machine interface module 9 (touchscreen). The auxiliary power supply uses TI's UC2845AD8TR (AC-DC controller), a flyback topology with low start-up current (<0.5mA), automatic feedforward compensation, pulse-by-pulse current limiting, and undervoltage lockout with hysteresis. It provides two independently isolated, stable 12V 5A power supplies to the BMS6 and the system control board 7. The human-machine interface module 9 can be configured with different interfaces (touchscreen, code break screen, DWIN screen, etc.) depending on the user's choice. It only needs to be connected to the main control output interface of the module. Through the pluggable connector at the rear of the module, it can be connected to a touchscreen, code break screen, etc., according to the customer's actual needs. This invention integrates the system control board 7, auxiliary power supply 8, and main power circuit into a single module, achieving a high degree of integration. It eliminates the need for an external system main control board and an external system auxiliary power supply. By connecting the power supply of the auxiliary power supply 8 to the PFC stage of the module, and ensuring that the power supply of the auxiliary power supply 8 passes through the EMI filter circuit 1 and the PFC rectifier boost circuit 2, the input source becomes more stable and controllable, thereby improving the reliability of the entire system.

[0023] The working process of this utility model is as follows: The AC power output from the power grid is filtered by the EMI filter circuit 1 and then passes through the PFC rectifier boost circuit 2 to output a DC voltage of ±400V. The output voltage after PFC rectifier boost 2 passes through the LLC full-bridge inverter circuit 3 and is rectified by the rectifier filter circuit 4 to provide a stable DC voltage output for the BMS6. This utility model is installed in the charging pile cabinet, which is equipped with corresponding card slots. By pushing the charging module into the card slots and setting and adjusting the charging parameters through the human-machine interface module 9, the power battery of the new energy vehicle can be charged.

[0024] Finally, it should be emphasized that the above description is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A novel power battery charging module, characterized in that, include: The main power circuit includes an input EMI filter circuit (1), a PFC rectifier boost circuit (2), an LLC full-bridge inverter circuit (3), a rectifier filter circuit (4), and a DSP control circuit (5). The input terminal of the PFC rectifier boost circuit (2) is connected to the power grid through the input EMI filter circuit (1). The output terminal of the PFC rectifier boost circuit (2) is connected to the LLC full-bridge inverter circuit (3). The output terminal of the LLC full-bridge inverter circuit (3) outputs a DC voltage to the BMS (6) through the rectifier filter circuit (4). The DSP control circuit (5) controls the switching transistors of the LLC full-bridge inverter circuit (3) by modulating the PWM signal, thereby controlling the magnitude of the output DC voltage. The system control board (7) is connected to the main power circuit and the BMS (6) respectively, and is used to control the main power circuit to charge the battery (10) through the BMS (6) and receive the information reported by the main power circuit. An auxiliary power supply (8) is provided, the input of which is connected to the output of the PFC rectifier boost circuit (2), and the output of which is connected to the system control board (7) and the BMS (6) respectively.

2. The novel power battery charging module according to claim 1, characterized in that, The system control board (7) uses a BL0550 isolated power supply.

3. The novel power battery charging module according to claim 1, characterized in that, The system control board (7) is connected to the main power circuit via 485 communication, and the system control board (7) is connected to the BMS (6) via CAN bus.

4. A novel power battery charging module according to claim 1, characterized in that, The system control board (7) is electrically connected to the human-machine interaction module (9), which uses a touch screen.

5. A novel power battery charging module according to claim 1, characterized in that, The auxiliary power supply (8) adopts an AC-DC controller.

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