High-voltage transformer protection circuit

Details High-voltage transformer protection circuit High-voltage transformer protection circuit

1989-07-26

1992-06-02

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

315411, 361 57, 363 56, H02H 3087, H02H 704

Patent

active

051192624

ABSTRACT:
A protection circuit against an excessive current in a flyback transformer which supplies a high voltage to a CRT. A fuse and current detecting resistor are inserted on the line which supplies a current to the primary winding of the flyback transformer. The intermediate point of the primary winding and the node of the fuse and current detecting resistor are connected by a semiconductor switching element which becomes conductive when the voltage across the current detecting resistor reaches a certain high voltage. Accordingly, if an excessive current flows in the flyback transformer, the thyristor turns on, causing the fuse to be blown by the large current, whereby the current supply to the flyback transformer can be shut off.

REFERENCES:
patent: 4149209 (1979-04-01), Stark, Jr.
patent: 4754206 (1988-06-01), Sorensen
patent: 4885509 (1989-12-01), Ikeuchi

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