REDUCTION OF EMI THROUGH SWITCHING FREQUENCY DITHERING

摘要

A method of controlling the bandwidth of electromagnetic interference generated by a pulse modulation controlled automotive motor is disclosed. The method comprises providing a controller including at least one register thereof (302); the controller in signal communication with the motor for controlling the motor based upon operating parameters (304) thereof; selecting a first pulse modulation frequency (306) from a set of pulse modulation frequencies; selecting a first clock frequency; selecting a first hopping frequency; selecting a first switching frequency (312), initializing the at least one register (302), establishing thereby a prescribed at least one number; based upon the prescribed at least one number of the at least one register, the first clock frequency and the first hopping frequency randomly changing the switching frequency of the pulse modulation.