Patent ID: 6219260
Filing Date: 2001-04-17
Classification: H02M,H02P

Abstract:
A motor driving circuit comprising:a base board made of metal;an insulating film formed on a surface of the base board;a PWM driving circuit formed on a surface of the insulating film for controlling driving currents flowing into plural phases of driving coils of a motor, the PWM driving circuit including conductive patterns having patterns in which the driving currents flow, and a low impedance portion; anda connector for connecting the metal base board and the low impedance portion to provide the metal base board a potential determined by the low impedance portion,wherein filter condensers are formed by the patterns, the metal base board connected to the low impedance portion, and the insulating film formed between the patterns and the base board, said filter condensers for absorbing high frequency noise generated in the PWM driving circuit.