Patent Number: 6,295,215

Title: AC power supply apparatus with economy mode and methods of operation thereof

Abstract: A power supply apparatus includes an AC input port, an output port, and a bypass circuit that couples the AC input port to the output port. An AC/DC converter circuit, e.g., a rectifier circuit, produces a DC voltage from an AC input voltage at the AC input port. A DC/AC converter circuit, e.g., a current mode controlled inverter, controls current transfer between the output port and the AC/DC converter circuit responsive to a control input such that respective first and second component currents of a current delivered to a load coupled to the output port pass via respective ones of the bypass circuit and the DC/AC converter circuit. The DC/AC converter circuit may be operated such that current passing through the bypass circuit is constrained to be substantially in phase with the AC input voltage. The power supply apparatus may have another mode of operation in which the DC/AC converter circuit exclusively provides power to the output port, and may include an auxiliary DC power supply circuit that provides a DC voltage to the DC/AC converter circuit. Related power supply methods are also discussed.

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

Assignee: Powerware Corporation

International Classification: H02J 9/06 (20060101); H02M 5/22 (20060101); H02M 5/02 (20060101); H02M 5/458 (20060101); H02M 5/00 (20060101); H02M 5/257 (20060101); H02M 005/458 ()

Expiration Date: 09/25/2018