System for supplying current to a load

Details System for supplying current to a load System for supplying current to a load

2009-04-30

2011-10-11

Le, Don (Department: 2819)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S2090SC

Reexamination Certificate

active

08035312

ABSTRACT:
A system for supplying current to a load is disclosed. One embodiment provides a switching converter for providing a load current to the load. The switching regulator includes a switching circuit. A current control unit generates a modulated current control signal representing a desired load current. The switching circuit is driven dependent on the modulated current control signal. A logic circuit receives a pulse-width-modulated control signal representing a desired dimming ratio and is configured to generate a gate signal for driving the switching circuit dependent on the current control signal during a duty cycle of the pulse-width-modulated control signal. The logic circuit is configured to activate the switching converter, independent on the state of the current control signal, at the beginning of the duty cycle of the pulse-width-modulated control signal.

REFERENCES:
patent: 7282870 (2007-10-01), Gong et al.
patent: 7388335 (2008-06-01), Kastle
patent: 2004/0155602 (2004-08-01), Buij et al.
patent: 2007/0210725 (2007-09-01), Marosek
patent: 2010/0308749 (2010-12-01), Liu

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