Single-stage digital power converter for driving LEDs

Details Single-stage digital power converter for driving LEDs Single-stage digital power converter for driving LEDs

2008-05-27

2008-05-27

Vu, David H. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S219000, C315S307000

Reexamination Certificate

active

11086955

ABSTRACT:
This invention presents a single-stage power converter for driving many number of Light-Emitting-Diode (LED). The power converter converts an AC input voltage into DC current source and regulates the current flowing into the LED. In addition, the AC input current is controlled to have a sinusoidal waveform synchronized with the AC input voltage so that AC input Power Factor is corrected. Hence, both of Power Factor Correction (PFC) and LED current regulation are obtained simultaneously by using a single power conversion stage. So higher efficiency with low cost can be obtained.

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patent: 2002/0158590 (2002-10-01), Saito et al.
patent: 2006/0113975 (2006-06-01), Mednik et al.

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