Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Lighting Corporation

Osram-melco Ltd.

Fumitake Oowada

Hiroyasu Kisaichi

Masatomi Asayama

To provide a high-pressure discharge lamp lighting apparatus which is adapted to be used in common for several kinds of AC voltages such as 100 V and 200 V, which is small in size, and which can secure good starting property with less circuit loss in use at any of the AC voltages, the apparatus is provided with a diode bridge for rectifying an AC voltage, an active filter for converting, with a high power factor, an AC voltage into a DC voltage, a current limiting circuit for controlling the current to be made to flow in the high-pressure discharge lamp, an inverter for converting a DC voltage into a low-frequency AC voltage, a high-voltage pulse circuit for generating a high-voltage pulse for starting the high-pressure discharge lamp, and a control circuit for controlling the active filter, the current limiting circuit, the inverter, a discharge-lamp voltage detecting circuit, a discharge-lamp current detecting circuit and the high-voltage pulse circuit.

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Kanagawa, Japan

Fumitake Oowada