Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2011-07-26
2011-07-26
Owens, Douglas W (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S2090SC, C315S224000, C315S307000, C315S308000, C315S312000, C345S102000
Reexamination Certificate
active
07986106
ABSTRACT:
A discharge lamp driving device includes a power stage circuit, a transformer circuit, a control circuit, a feedback circuit and a lamp protection circuit. The lamp protection circuit includes a current sensing circuit, a reference voltage selecting circuit, a comparing circuit and a protection signal generating circuit. The current sensing circuit senses current signals flowing through the lamps, and transforms the current signals to voltage signals. The reference voltage selecting circuit is connected to the current sensing circuit. The comparing circuit is connected to the current sensing circuit and the comparing circuit. The protection signal generating circuit is connected between the comparing circuit and the control circuit. The control circuit is connected to the comparing circuit.
REFERENCES:
patent: 6922023 (2005-07-01), Hsu et al.
patent: 2005/0225261 (2005-10-01), Jin
Chao Yu-Hsiao
Chen Hung-Yi
Lee Chi-Hsiung
Ampower Technology Co., Ltd.
Niranjan Frank R.
Owens Douglas W
Pham Thai
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