Circuit for detecting a wrong operation of a flyback transformer

Details Circuit for detecting a wrong operation of a flyback transformer Circuit for detecting a wrong operation of a flyback transformer

1997-09-02

1999-07-13

Do, Diep N.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324546, 324726, G01R 3106

Patent

active

059231734

ABSTRACT:
A circuit, which can detect a wrong operation of a flyback transformer having a low voltage coil and a high voltage coil, includes a voltage sensing coil which is disposed at the flyback transformer in order to generate a sensed voltage corresponding to a high voltage generated by the high voltage coil. A voltage sensing circuit generates a voltage-sensed signal corresponding to the sensed voltage and provides the voltage-sensed signal to a determination circuit. The determination circuit determines whether the flyback transformer is out of order based on the voltage-sensed signal and the horizontal frequency signal, and generates a determination signal according to the determination result. The shut-down circuit shuts down the flyback transformer in response to the determination signal, thereby preventing the abnormal flyback transformer from generating a dangerously high voltage.

REFERENCES:
patent: 3934194 (1976-01-01), Paprocki
patent: 3990002 (1976-11-01), Baum
patent: 4064454 (1977-12-01), Yoshino et al.
patent: 4090111 (1978-05-01), Suzuki
patent: 4885509 (1989-12-01), Ikeuchi
patent: 5278746 (1994-01-01), Matsumoto
patent: 5717338 (1998-02-01), Cook

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