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.

主权项

1. A drive circuit for electromagnetic interference (EMI) reduction provided by a power line to a motor controller, the power line comprising at least a first alternating current (AC) line output and a second AC line output, said drive circuit comprising:
an EMI filter having at least a first EMI filter input terminal, a second EMI filter input terminal, a first EMI filter output terminal, and a second EMI filter output terminal, said first EMI filter input terminal configured to be coupled to the first AC line output and said second EMI filter input terminal configured to be coupled to the second AC line output; a rectifier portion comprising a first rectifier input terminal coupled to said first EMI filter output terminal and a second rectifier input terminal coupled to said second EMI filter output terminal; at least two series-coupled filter capacitors positioned after said rectifier portion; and a power factor correction (PFC) choke comprising a first end and a second end, said first end coupled to one of said first and second EMI filter output terminals and to one of said first and second rectifier input terminals, said second end coupled between said at least two series-coupled filter capacitors.