High voltage protection circuit having predictable firing point

Details High voltage protection circuit having predictable firing point High voltage protection circuit having predictable firing point

1977-07-26

1978-09-12

Birmiel, Howard A.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

358190, H01J 2970

Patent

active

041140729

ABSTRACT:
A rectifying device, a switching device and a reference voltage device are coupled in parallel relationship between a winding of a transformer associated with the deflection circuitry of a television receiver and a filter capacitor of a power supply circuit for providing operating voltage to other portions of the receiver. The reference voltage device is also coupled to a control terminal of the switching device to control its conduction. Under normal conditions, the rectifying device is conductive in only one direction so that the filter capacitor is charged to a sufficient operating voltage to permit the normal operation of the receiver. The reference voltage device is selected so that if, under abnormal conditions, the difference between the voltage developed across the filter capacitor and the voltage developed across the transformer winding exceeds a level corresponding to an excessively high and therefore possibly harmful deflection voltage, the reference voltage device conducts a conduction control current to the control terminal of the switching device sufficient to render it conductive. Under these conditions, the development of sufficient voltage across the capacitor to support the normal operation of the receiver is inhibited and a viewer is effectively warned of the abnormal and potentially harmful condition.

REFERENCES:
patent: 3296498 (1967-01-01), Chassanoff et al.
patent: 3475653 (1969-10-01), Odenberg
patent: 3906304 (1975-09-01), Willis

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