Patent Number: 6,295,216

Title: Power supply apparatus with selective rectifier harmonic input current suppression and methods of operation thereof

Abstract: A power supply apparatus includes an AC input port and a rectifier circuit, coupled to the AC input port, that produces a DC voltage at a rectifier circuit output from an AC input voltage at the AC input port. The apparatus further includes a selective harmonic current inducing circuit, coupled to the rectifier circuit output, that induces a harmonic component in a current delivered to a load from the rectifier circuit output. The selective harmonic current inducing circuit may control a phase and a magnitude of the induced harmonic current component in order to achieve selective suppression of a harmonic input current at the AC input port. The power supply apparatus may further include a filter circuit, coupled to the AC input port, that selectively suppresses a first harmonic current at the AC input port. The selective harmonic current inducing circuit may control the phase and magnitude of the induced harmonic current component such that a second harmonic current at the AC input port is suppressed. For example, for a three-phase passive rectifier circuit, the filter circuit may suppress a fifth harmonic input current, and the selective harmonic current inducing circuit may control the phase and magnitude of an induced sixth harmonic current component such that a seventh harmonic input current at the AC input port is suppressed. Related methods are also discussed.

Inventors: Faria; Des (Ontario, CA), Zhang; Hong (Ontario, CA), Grudzinski; Piotr (Ontario, CA), Akbari; Edward (Ontario, CA)

Assignee: Powerware Corporation

International Classification: H02M 1/00 (20060101); H02M 1/12 (20060101); H02M 001/12 ()

Expiration Date: 09/25/2018