Frequency feedforward for constant light output in backlight...

Details Frequency feedforward for constant light output in backlight... Frequency feedforward for constant light output in backlight...

2007-06-26

2007-06-26

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

Using semiconductor-type converter

C363S041000

Reexamination Certificate

active

11325120

ABSTRACT:
In a method and system for an improved inverter providing power to a load, the inverter receives a direct current (DC) input. A plurality of switches included in the inverter are controlled by a plurality of control signals to generate an alternating current (AC) output in response to the DC input. A zero crossing of the AC output current provided by the plurality of switches is detected, and the controlling of the plurality of switches is delayed in response to the zero crossing. The amount of delay is adjusted responsive to a change in the DC input to effectively maintain a constant switching frequency of the inverter. The delayed AC output current of the plurality of switches is filtered to provide power to the load.

REFERENCES:
patent: 5004969 (1991-04-01), Schanin
patent: 5420779 (1995-05-01), Payne
patent: 5430641 (1995-07-01), Kates
patent: 6108215 (2000-08-01), Kates et al.
patent: 6130509 (2000-10-01), Kates et al.
patent: 6903949 (2005-06-01), Ribarich

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