Constant-current drive circuit

Details Constant-current drive circuit Constant-current drive circuit

2011-08-30

2011-08-30

Choi, Jacob Y (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S291000, C315S294000, C315S312000, C363S021090, C363S021100

Reexamination Certificate

active

08008870

ABSTRACT:
A voltage supplied from a power supply is boosted by a boosting circuit unit to generate a direct-current voltage, and the pulse-shape direct-current voltage is applied to LED while a constant-voltage control unit controls the direct-current voltage. The operation of LED is controlled by a control unit and a PWM unit. When the current is passed through LED, the constant-voltage control unit obtains information on the current passed through LED from a potential difference between both ends of a resistor, and on-and-off control of the voltage applied to LED from the boosting circuit unit is performed at a high frequency based on the information. Therefore, the voltage applied to LED can be controlled to keep the current passed through LED constant.

REFERENCES:
patent: 6909249 (2005-06-01), Otake
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patent: 2004/0251854 (2004-12-01), Matsuda et al.
patent: 2007/0035538 (2007-02-01), Garcia et al.
patent: 2000-214825 (2000-08-01), None
patent: WO 2004/057921 (2004-07-01), None

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