Apparatus and method of employing combined switching and PWM...

Details Apparatus and method of employing combined switching and PWM... Apparatus and method of employing combined switching and PWM...

2004-08-27

2010-11-16

Tso, Edward (Department: 2858)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S016000, C363S025000, C363S095000, C363S097000

Reexamination Certificate

active

07835164

ABSTRACT:
An AC power supply system modulates a high frequency switching signal with a pulse width modulation (PWM) signal to produce a composite signal. The duty cycle of the PWM component of the composite signal is used to control the brightness of a cold cathode fluorescent lamp for backlighting a liquid crystal display.

REFERENCES:
patent: 4975820 (1990-12-01), Szepesi
patent: 6181092 (2001-01-01), Turner
patent: 6967852 (2005-11-01), Hamilton
patent: 2004/0233663 (2004-11-01), Emslie et al.

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