一、The necessity of electrostatic protection for pump and fan systems in new energy vehicles

（The diagram shows the pump and fan system of Ideal Automobile, a well-known domestic new energy vehicle manufacturer）

In new energy vehicles, the pump and fan system is an important component of the vehicle's thermal management system, mainly used for cooling and thermal management, and also includes close coordination with other systems such as BMS, motor and electronic control system, air conditioning system, and electronic control system. How to do well in static electricity protection for pump and fan systems? Lei Mao's EMC research sharing is as follows：

二、 Working principle and electrostatic protection of pump and fan system

Understand the pump and fan system in new energy vehicles by drawing a diagram with engineers from Shanghai Leimao.

1. BMS continuously monitors the temperature of the battery. When the battery temperature exceeds the preset range, BMS will adjust the battery temperature through a pump and fan system.

2. The driving motor generates a large amount of heat during operation, and the pump and fan in the motor cooling system can effectively remove the heat generated by the motor, ensuring a suitable temperature.

3. The pump and fan system can assist the air conditioner in heat exchange, thereby better controlling the temperature inside the car.

4. The pump and fan system is usually controlled by an ECU, which adjusts the pump speed and fan opening through a closed-loop control system to ensure that the system temperature remains within the set target range.

5. The pump and fan system also need to work together with other thermal management components (such as radiators, expansion tanks, coolant hoses, etc.) to form a complete thermal management system.

The communication between the pump and fan system, as well as other systems in the car, is usually achieved through onboard networks such as CAN bus, LIN, FlexRay, Ethernet, etc. Shanghai Leimao provides comprehensive electrostatic protection and EMC (electromagnetic compatibility) solutions for these interfaces, ensuring reliable communication of the system in harsh electromagnetic environments.

三、Shanghai Leimao can provide comprehensive EMC solutions and services for new energy vehicle pump and fan systems：

This includes EMC solution reference design, testing and validation, technical support, etc., and can provide a variety of protective components and MOSFET devices to ensure electromagnetic compatibility of automotive pump and fan systems, protecting key circuits in the system from electromagnetic interference.

Shanghai Leimao recommends ESD part numbers for electrostatic protection at various interfaces of pump and fan systems：

Shanghai Leimao recommends MOSFET part number (RDS (on)<5 m Ω) for fan control in pump and fan systems

Suggest using MOSFETs with low on resistance (Rds (on)) and low gate charge (Qg)

Shanghai Leimao EMC recommends adding suitable TVS diodes and other protective components to DC power input, motor drive circuit, power management module, relays, and contactors to prevent overvoltage, overcurrent, or back electromotive force. Specific parameters need to be determined according to actual situations. Shanghai Leimao has a professional laboratory that can provide testing services for automotive electronic components and assist customers in selecting suitable TVS models。

For more interface protection schemes, please follow the official account of Shanghai Leimao or contact EMC.

Shanghai Leimao specializes in the research and sales of ESD, TVS，TSS，GDT，MOV，MOSFET，Zener， Inductors and other products. Lei Mao is committed to providing customers with high-quality products to protect circuits from electrostatic interference and voltage fluctuations. Lei Mao has an experienced R&D team that can provide personalized customized services according to customer needs and provide customers with the highest quality solutions.