DC/DC converter

Details DC/DC converter DC/DC converter

2008-05-06

2008-05-06

Tran, Thuy V. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S291000, C315S2090SC, C315S362000

Reexamination Certificate

active

07368884

ABSTRACT:
A control circuit of a DC/DC converter is provided for supplying a driving voltage to a light emitting element. A hysteresis comparator compares a detection voltage that corresponds to the output voltage of the DC/DC converter with two threshold voltages. If the detection voltage is smaller than the lower threshold voltage, the hysteresis comparator outputs a comparison signal at the low level. Otherwise, the comparison signal is set to the high level. The switching control unit uses the comparison signal as a reference. The switching control unit instructs the switching transistor of the DC/DC converter to perform the switching operation during a period when the comparison signal is at the low level. Otherwise, the switching operation is suspended. The control circuit inhibits light emission of the light emitting element during a period when the comparison signal is at the low level. Otherwise, the control circuit permits the light emission.

REFERENCES:
patent: 6445141 (2002-09-01), Kastner et al.
patent: 6946807 (2005-09-01), Okamoto et al.
patent: 2006/0028148 (2006-02-01), Ichikawa et al.
patent: 2007/0013323 (2007-01-01), De Oto
patent: 2004-201474 (2004-07-01), None
patent: 2005-73483 (2005-03-01), None

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