Power supply DC voltage offset detector

Details Power supply DC voltage offset detector Power supply DC voltage offset detector

2011-01-04

2011-01-04

Patel, Rajnikant B (Department: 2838)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

C315S307000, C363S089000

Reexamination Certificate

active

07863828

ABSTRACT:
A power supply output voltage direct current (DC) offset detector determines a DC offset in a power supply output voltage signal, and the output voltage signal has a DC component and an alternating current (AC) “ripple” component. Once during each period of the ripple, the DC offset detector determines the DC offset from an output voltage signal using a comparison between the output voltage signal and a reference voltage. In at least one embodiment, from the comparison and during a period of the ripple, the DC offset detector determines an ‘above’ duration for which the ripple is above the reference voltage, determines a ‘below’ duration for which the ripple is below the reference voltage, or both to determine the DC offset of the power supply output voltage signal. The DC offset detector uses the above and/or below duration(s) to determine the DC offset of the output voltage signal.

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