Lamp having integral voltage controller

Details Lamp having integral voltage controller Lamp having integral voltage controller

2006-05-23

2006-05-23

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Plural circuit elements

C315S072000, C315S246000, C315S2090SC, C315S287000, C315S307000, C315S360000

Reexamination Certificate

active

07049750

ABSTRACT:
A lamp includes a voltage conversion circuit that converts a line voltage to a desired RMS load voltage. The voltage conversion circuit is entirely within a lamp base and uses pulse width modulation to define the RMS load voltage. The voltage conversion circuit includes a bridge that supplies the RMS load voltage to a light emitting element, a switching transistor that pulse width modulates a current supplied to the bridge, a timer connected to a gate of the switching transistor to turn the switching transistor on and off at a rate that defines the RMS load voltage, an analog-to-digital converter that converts the RMS load voltage to a digital signal, a comparator that compares an output from the converter to a preset reference value, and a circuit that adjusts the timer in response to an output from the comparator.

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