What is the Principle of On-board Charger for New Energy Vehicles?

1 Answers
Tonya
07/29/25 4:34pm
On-board charger working principle is as follows: On-board charger power supply: The on-board charger sends a charging request signal to the VCU through the "charging request signal" line of the output port and supplies power to the vehicle controller through the low-voltage power port. If the VCU determines that the battery pack status is suitable for charging, it sends a charging message to the charger, including the requirements for charging parameters. The message content is part of the vehicle communication message. Current control: The power source provides the maximum charging current value to the vehicle controller through the PWM signal. The vehicle controller comprehensively considers the maximum current of the battery pack, the on-board charger, and the charging power source, and selects the minimum value as the current upper limit for this charging session to avoid overcurrent in any of the three components.
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