Electric lamp and discharge devices: systems – Cathode ray tube circuits – Power supply from deflection circuit source
Patent
1976-05-28
1977-08-16
Engle, Samuel
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Power supply from deflection circuit source
358190, 358243, H04N 138
Patent
active
040428591
ABSTRACT:
A horizontal deflection circuit of a television receiver comprises series-connected first and second capacitors resonated with the deflection coil to provide an oscillating current during the retrace period of horizontal scanning. A switching transistor is provided to disable the deflection coil when rendered conductive. A negative bias voltage is derived from the juncture between the first and second capacitors. A positive bias voltage is derived from the flyback transformer and applied to the base of the transistor together with the negative bias voltage. Under the normal condition of the circuit, the resultant voltage at the base of transistor holds it under the blocking state. Should the first capacitor become faulty, the transistor is biased into the conducting state by the positive potential to disable the circuit.
REFERENCES:
patent: 3688031 (1972-08-01), Fitzgerald, Jr. et al.
patent: 3692932 (1972-09-01), Wilmarth
patent: 3715464 (1973-02-01), Sendelweck
patent: 3740472 (1973-06-01), Fitzgerald, Jr.
patent: 3881135 (1975-04-01), Dietz
Adams Bruce L.
Burns Robert E.
Cangialosi S. A.
Engle Samuel
Lobato Emmanuel J.
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