Lamp that sets desired rms load voltage with variable pulse...

Details Lamp that sets desired rms load voltage with variable pulse... Lamp that sets desired rms load voltage with variable pulse...

H - Electricity

01

K

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

Patent

CA 2538654

A lamp includes a voltage controller that converts a line voltage to a desired RMS load voltage. The voltage controller is entirely within a lamp base and uses pulse width modulation to define the RMS load voltage. The voltage controller has a feed- back circuit that adjusts the RMS load voltage to a desired voltage based on a comparison to a preset reference. The voltage converter also includes a switching transistor that pulse width modulates lamp current and that is responsive to the feed-back circuit. The feed-back circuit may be included in a microcontroller that has a time-based signal source that triggers the transistor, a comparator that compares the load voltage to a reference, and a program that adjusts the time-based signal source based on the comparison so as to provide the desired RMS load voltage.

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