Device for controlling lighting of discharge lamp and H-bridge c

Details Device for controlling lighting of discharge lamp and H-bridge c Device for controlling lighting of discharge lamp and H-bridge c

1998-11-19

2000-04-04

Philogene, Haissa

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315291, 315309, 363 13, 363 98, H05B 3702

Patent

active

060465514

ABSTRACT:
A discharge lamp lighting control device comprises an H-bridge circuit connected between the secondary coil of a transformer and a discharge lamp and provided with a first pair of transistors and a second pair of transistors, capable of converting a DC voltage produced from an AC voltage that appears at the secondary coil of the transformer into an AC voltage whose polarity is changed at predetermined intervals so as to apply the AC voltage to the discharge lamp. The first pair of transistors have withstand voltage characteristic superior to that of the second pair of transistors. The on-state resistances of the four transistors of the first and second pairs can be equal to each other so that the difference between the on-state resistances may be ignored. A control unit turns on only the first pair of transistors when applying a high voltage to the discharge lamp to cause a discharge to pass through the gas contained in the discharge lamp. The control unit can estimate an on-state resistance of the first and second pair of transistors and also predict an AC voltage actually applied to the discharge lamp from the estimated on-state resistance to control a voltage applied to the primary coil of the transformer so that a predetermined power is supplied to the discharge lamp.

REFERENCES:
patent: 5434474 (1995-07-01), Ukita et al.
patent: 5481163 (1996-01-01), Nakamura et al.
patent: 5486740 (1996-01-01), Yamashita et al.
patent: 5705897 (1998-01-01), Hanazaki et al.
patent: 5910712 (1999-06-01), Toyama

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