Matsushita Electric Works, Ltd.

Naokage Kishimoto

Hiroyuki Sako

Akinori Hiramatsu

Nobukazu Miki

Kazuhiro Gotoh

Seiji Soga

A power supply for driving one or more loads includes a DC voltage source, an inverter connected to the DC voltage source for providing a high frequency AC voltage at its output end, and an output transformer having a primary winding and a secondary winding. The primary winding is coupled to the output end of the inverter through a tuning inductor, while the secondary winding is coupled to the load. A tuning capacitor, which constitutes a resonant circuit in cooperation with the resonance inductance for supplying a resonance current to the load, is connected across the secondary winding of the output transformer in parallel relation to the load. The tuning capacitor is arranged in circuit on the opposite side of the secondary winding from the load such that the tuning capacitor is open-circuited when the load is disconnected from the secondary winding.

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Sunnyvale, CA, United States of America

Naokage Kishimoto