Current driver circuit and method of operation therefor

Details Current driver circuit and method of operation therefor Current driver circuit and method of operation therefor

2005-04-18

2010-12-21

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S291000, C315S307000

Reexamination Certificate

active

07855517

ABSTRACT:
A current driver circuit comprises a digital circuitry having a current adjustment function and operably coupled to a current driver for providing a current to a current consuming device. The digital circuitry comprises, or is operably coupled to, a function arranged to determine a load impedance associated with the current consuming device. The current adjustment function varies a current limit applied to the current driver in response to a variation in the load impedance.In this manner, the load impedance (or temperature) of a current consuming device, such as a light bulb, is used to continuously or intermittently adjusting the current limit of a current driver circuit, such as a lamp driver, to minimize the energy dissipated in case of an overload condition.

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