Lamp having integral voltage controller

Details Lamp having integral voltage controller Lamp having integral voltage controller

H - Electricity

01

K

H01K 1/62 (2006.01) H02M 5/293 (2006.01)

Patent

CA 2538853

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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