风冷冰箱控制板风扇电机驱动电路EMI问题改善方案分析

Abstract

Abstract: This paper studies the electromagnetic interference (EMI) caused by using Mos drive to control fan motor in refrigerator main board, finds out the main EMI interference sources of fan motor drive circuit, and puts forward three schemes by adjusting the inductance of buck circuit to make it work in DCM mode, adding RC snubber circuit in parallel with the fly-wheel diode or reducing Mos switching speed, to solve the EMI problem.

Key words: Fan motor, Mos, EMI, DCM, CCM, BUCK

KAN Aimei, ZHOU Ze, REN Guobing. Analysis of EMI improvement for fan motor drive circuit in main board of air-cooled refrigerator[J]. Journal of Appliance Science & Technology, 2018, 0(9): 82-87.

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Analysis of EMI improvement for fan motor drive circuit in main board of air-cooled refrigerator

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