充电系统三合一总成的电磁干扰及抑制研究

Research on electromagnetic interference and suppression of three-in-one assembly of charging system

该文针对车载充电机、DC-DC和高压配电盒组成的电动汽车充电系统三合一总成模块,在高压工作时电磁干扰超标问题进行分析及抑制研究。分析车载充电机前级电路和DC-DC电路的结构、控制方法,建立了稳压、抗干扰的仿真模型,进行传导干扰、辐射干扰实验;分析三合一总成模块传导干扰源,采取超级电容滤波、设备外壳接地及线束屏蔽的措施抑制三合一总成传导干扰。将仿真结果与实验结果对比,两者变化趋势一致,对比抑制前后三合一总成传导干扰波形,幅值降低符合标准。验证了仿真模型的正确性及整改方案的可行性,为电动汽车集成化模块电磁干扰研究提供了理论基础。

This paper analyzes and studiess the electromagnetic interference and suppression of the three-in-one assembly module of electric vehicle charging system, which is composed of on-board charger, DC-DC and highvoltage distribution box. This paper analyzes the structure and control method of the pre-circuit and DC-DC circuit of the vehicle charger, establishes the simulation model of voltage stabilization and anti-interference, carries out the conducted interference and radiation interference experiment;and analyzes the conduction interference source of the three-in-one assembly module, and take the measures of super capacitor filtering, equipment shell grounding and wire harness shielding to suppress the conducted interference of the three-in-one assembly. Comparing the simulation results with the experimental results, the change trend of the two is consistent. Comparing the conducted interference waveform of the three-in-one assembly before and after suppression, the amplitude reduction meets the standard. The correctness of the simulation model and the feasibility of the rectification plan are verified, which provides a theoretical basis for the electromagnetic interference research of the electric vehicles integrated module.