Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1996-09-18
2000-05-30
Shingleton, Michael B
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315DIG7, 315248, 315219, 315224, H05B 3702
Patent
active
060694580
ABSTRACT:
This invention is to provide an inexpensive high intensity discharge lamp lighting device having a simplified circuit construction, which does not use a full-bridge mode inverter. The high intensity discharge lamp lighting device includes a rectifier for a power-frequency power supply, a booster chopper mode sine wave converter, a zero volt switching push pull inverter, and a high intensity lamp of a halide lamp. And, as a starting device for the halide lamp, the high intensity discharge lamp lighting device generates a high voltage (5 KV) using a resonance by a ballast choke for the inverter and a condenser connected in parallel to the halide lamp, thereby inducing a glow discharge. And, a PFM (pulse frequency modulation) circuit controls the lamp current of the halide lamp to keep it constant. And, when the AC power is turned off and turned on again, a re-lighting circuit after lighting works such that the control IC stops operation by a pulse-by-pulse mode current limiter of an inverter control IC, thereafter a soft starting circuit operates to generate a high voltage on the output of the inverter; when the lamp temperature is so high that the mercury vapor pressure inside the tube goes high and lighting cannot be started, the foregoing operation is repeated to achieve re-lighting.
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Masato H. Ohsato, et al.; New Type of Ballast for Hid Lamps Using Series Resonant Circuit; Institute of Electrical and Electronics Engineers, vol. 1; Nov. 9, 1992; pp. 191-195.
E. Rasch, et al.; Behavior of Metal Halide Lamps with Conventional and Electronic Ballasts; Journal of the Illuminating engineering Society, vol. 20; Summer 1991; pp. 88-96.
Sam Ben-Yaakov, et al.; Design and Performance of an Electronic Ballast for High Pressure Sodium (HPS) Lamps; Institute of Electrical and Electronics Engineers, vol. 2; Mar. 5, 1995; pp. 665-669.
Norizuki Masashi
Takehara Takao
Minebea Co. Ltd.
Shingleton Michael B
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