High voltage discharge lamp lighting device

Details High voltage discharge lamp lighting device High voltage discharge lamp lighting device

2009-03-25

2011-10-25

Tan, Vibol (Department: 2819)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

C315S274000, C315S278000, C315S291000, C363S021110, C363S021080

Reexamination Certificate

active

08044601

ABSTRACT:
A high-voltage discharge lamp lighting device provides a starting pulse voltage sufficient to turn on a high-voltage discharge lamp having terminal wire connections of variable length. A power conversion circuit is coupled to a commercial AC power source input and rectifies the AC input into a predetermined DC voltage output. A charging capacitor is coupled to the power conversion circuit. A full bridge circuit is coupled to the power conversion circuit and the charging capacitor and provides a rectangular wave AC output signal to a transformer primary winding circuit of at least a capacitor, a single switching element and a primary winding of a transformer. A low pulse voltage is induced in the primary winding and a transformer secondary winding is connected on one end to the high-voltage discharge lamp, wherein the low pulse voltage is stepped up to a high pulse voltage and applied to the high-voltage discharge lamp. A reference voltage is generated in a reference transformer winding representative of the high pulse voltage. A starting pulse equivalent value detection circuit is connected to the reference winding and detects a value associated with the reference voltage. A control circuit receives said value from said detection circuit, and variably controls at least one of a frequency of the single switching element or an ON impedance of the single switching element in association with said value, wherein said frequency or ON impedance is further associated with a starting pulse voltage sufficient to start the high-voltage discharge lamp.

REFERENCES:
patent: 7035121 (2006-04-01), Umetsu
patent: 7492615 (2009-02-01), Morota et al.
patent: 2010/0327775 (2010-12-01), Komatsu et al.
patent: 2007052977 (2007-03-01), None

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