Yin Nan Enterprises Co., Ltd.

Hitech Electronics Co., Ltd.

Tsai-Fu Lin

Tsorng-Juu Liang

Chin-Sien Moo

Hau-Chen Yen

A three-stage electronic ballast for metal halide lamps mainly comprises a step-up converter, a step-down converter and a full-bridge DC-AC converter, wherein the step-down converter operates an inductor in a continuous boundary current mode to achieve reducing power loss and enhancing efficiency. Equipped with a micro processor, the electronic ballast further possesses the function of power regulation. The electronic ballast can be added with various protective functions without complex control circuits and sensing elements, thereby becoming a high-quality and low-cost electronic ballast for metal halide lamps.

Three-stage electronic ballast for metal halide lamps

A multi-lamp protection circuit for an electronic ballast includes an inverter circuit of various types, and a transistor switch provided in the inverter circuit and connected to a plurality of lamp circuits, each lamp circuit connected respectively in series to a transistor switch and a disorder checking circuit. The signal got by the disorder checking circuits mixed with a control signal starts resonance transistors so as to checking disorder and separating the damaged lamp(s), lessening its producing cost and achieving normal efficiency of the lamps.

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Pingtung, Taiwan

Tsai-Fu Lin