Patent ID: 6469919
Filing Date: 2002-10-22
Classification: H01J,H02M

Abstract:
A power supply circuit for supplying alternating power to a load, comprising:a source of direct current (DC) voltage; a half-bridge inverter for receiving the DC input voltage and for generating an alternating current (AC) output signal; a first harmonic filter at the output of the inverter, the first harmonic filter filtering out predetermined harmonic components of the AC signal to generate a filtered AC signal; and an output circuit at the output of the first harmonic filter for receiving the filtered AC signal and feeding the filtered AC signal to a load, wherein the output circuit includes first and second rectifiers connected relative to a point in the output circuit such that if the inverter attempts to drive the point to a voltage which exceeds one of a predetermined first and second voltage, a respective one of the first and second rectifiers conducts to cause at least one of voltage and current to return to the source of DC voltage.