Switched constant current driving and control circuit

Details Switched constant current driving and control circuit Switched constant current driving and control circuit

2008-04-15

2008-04-15

Vu, David H. (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S307000, C315S308000

Reexamination Certificate

active

07358681

ABSTRACT:
The driving and control device according to the present invention provides a desired switched current to a load including a string of one or more electronic devices, and comprises one or more voltage conversion means, one or more dimming control means, one or more feedback element and one or more sensing means. The voltage conversion means may be a DC-to-DC converter for example and based on an input control signal converts the magnitude of the voltage from the power supply to another magnitude that is desired at the high side of the load. The dimming control element may comprise a switch such as a FET, BJT, relay, or any other type of switching device, for example, and provides control for activation and deactivation of the load. The feedback means is coupled to the voltage conversion element and a current sensing element and provides a feedback signal to the voltage conversion element that is indicative of the voltage drop across the current sensing element which thus represents the current flowing through the load. The current sensing element may comprise a fixed resistor, variable resistor, inductor, or some other element which has a predictable voltage-current relationship and thus will provide a measurement of the current flowing through the load based on a collected voltage signal. Based on the feedback signal received, the voltage conversion means can subsequently adjust its output voltage such that a constant switched current is provided to the load.

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