Method and apparatus for detecting demagnetizing time of...

Details Method and apparatus for detecting demagnetizing time of... Method and apparatus for detecting demagnetizing time of...

2006-08-15

2008-12-30

Vu, Bao Q (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021120, C363S021170, C363S021180, C363S097000, C363S131000

Reexamination Certificate

active

07471523

ABSTRACT:
A detection circuit for detecting the demagnetizing time of a magnetic device is provided. An input circuit is coupled to the magnetic device for detecting a magnetizing voltage and a demagnetizing voltage of the magnetic device. A control circuit is coupled to the input circuit for generating a demagnetizing-time signal in response to the magnetizing voltage, the demagnetizing voltage, and a magnetizing time. The magnetizing time is correlated to the enable period of the magnetizing voltage. The demagnetizing time of the magnetic device is represented by the demagnetizing-time signal.

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