High voltage protecting circuit

Details High voltage protecting circuit High voltage protecting circuit

1987-07-09

1988-11-29

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 91, 358190, 358243, 315411, H02H 320

Patent

active

047886188

ABSTRACT:
A high voltage protecting circuit in a cathode ray tube apparatus which comprises a main power switch adapted to be connected in series with an electric power source, a flyback transformer having primary, secondary and third windings, a rectifying circuit connected with the main power switch for rectifying a power source voltage originating from the power source and to be supplied to the flyback transformer, a switching device connected between the main power switch and rectifying circuit and provided with a control terminal, and a high voltage detecting and controlling device for comparing an output voltage, produced across the third winding of the flyback transformer, with a reference voltage and for generating a control signal when the output voltage exceeds the reference voltage. The control signal is utilized to hold the switching device in an OFF position.

REFERENCES:
patent: 2815446 (1957-12-01), Coombs
patent: 4118739 (1978-10-01), Umehara
patent: 4213166 (1980-07-01), Watanabe

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