关键词: 燃料电池；冷藏车；市电；整车高压电

Abstract: Aiming at the problems of high energy consumption and limited driving range of the refrigeration unit of fuel cell refrigerated vehicles, this article proposes an energy supply system of "city electricity consumption" based on dual-mode switching. Through the intelligent switching controller integrated with the controller area network (CAN) bus communication and multi-level safety protection mechanisms, including contactor interlocking, pre-charge detection and insulation monitoring, the safe and seamless switching between the mains power supply and the power battery supply mode has been achieved. Real vehicle verification shows that under the high-voltage state of the entire vehicle, the system can quickly complete the conversion from battery mode to mains power mode after the driver triggers the switching command, and the switching time is 4.2 s. During the switching process, the refrigeration unit operates continuously and stably without overcurrent faults. After adopting the direct drive mode of municipal electricity, the energy conversion loss of the entire vehicle is significantly reduced, and the economic efficiency of cold chain transportation and the service life of the fuel cell system are effectively improved, providing a feasible technical solution to the contradiction between the range and refrigeration demand of refrigerated vehicles.

Key words: fuel cell; refrigerated vehicles; mains power; high-voltage power of the vehicle