Methods and systems for reducing conducted electromagnetic interference

摘要

A drive circuit is provided for reducing conducted electromagnetic interference provided by a power line to a motor controller. The drive circuit includes an EMI filter having first and second EMI filter input terminals, and first and second EMI filter output terminals. The first input terminal is configured to be coupled to a first AC line output and the second input terminal is configured to be coupled to a second AC line output. The drive circuit includes a rectifier portion having first and rectifier input terminals coupled to the first and second EMI output terminals, respectively. The drive circuit includes at least two series-coupled filter capacitors after the rectifier portion and a PFC choke coupled at a first end to one of the EMI filter output terminals and to one of the first and second rectifier input terminals, and at a second end between the series-coupled filter capacitors.