Phase shift modulation-based control of amplitude of AC...

Details Phase shift modulation-based control of amplitude of AC... Phase shift modulation-based control of amplitude of AC...

2005-01-31

2008-05-06

Tran, Thuy V. (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

C315S224000, C315S276000, C315S307000

Reexamination Certificate

active

07368880

ABSTRACT:
A double-ended, DC-AC converter supplies AC power to a load, such as a cold cathode fluorescent lamp used to back-light a liquid crystal display. First and second converter stages generate respective first and second sinusoidal voltages having the same frequency and amplitude, but having a controlled phase difference therebetween. By employing a voltage controlled delay circuit to control the phase difference between the first and second sinusoidal voltages, the converter is able to vary the amplitude of the composite voltage differential produced across the opposite ends of the load. The converter may be either voltage fed or current fed.

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