Electric lamp and discharge devices: systems – Cathode ray tube circuits – Power supply from deflection circuit source
Patent
1986-03-28
1987-07-14
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Power supply from deflection circuit source
358190, 3581941, H01J 2970
Patent
active
046805117
ABSTRACT:
An input signal for controlling a television power supply has "power-on" and "power-off" signal states. When the input signal is in the "power-on" state, it couples a clock signal to a primary winding of a transformer causing an alternating current voltage that is conductively isolated from the input signal to be developed across a secondary winding of the transformer. When the input signal is in the "power-off" state, it decouples the clock signal from the primary winding so that no alternating current voltage is developed across the secondary winding. The signal across the secondary winding is demodulated in a demodulator that produces a control signal that is conductively isolated from the input signal. The control signal is coupled to a regulator of the power supply. A power-on state of the control signal occurs when the alternating current voltage is developed at the secondary winding terminal. A power-off state of the control signal occurs when the alternating current voltage is absent.
REFERENCES:
patent: 4185234 (1980-01-01), Baker
patent: 4392090 (1983-07-01), Rinehart et al.
patent: 4441052 (1984-04-01), Willis
patent: 4516168 (1985-05-01), Hicks
patent: 4516169 (1985-05-01), Truskalo
Service Manual entitled RCA Color Television Basic Service Data, CTC 131 Series, Published in 1984 by RCA Corporation (cover sheet and p. 8).
U.S. patent application No. 760,545 entitled Circuit for Generating a Clock Signal at an AC Line Frequency, in the names of D. H. Willis et al.
Fernsler Ronald E.
Fitzgerald William V.
Nortrup Kevin E.
Blum Theodore M.
Henig Sammy S.
Laks Joseph J.
RCA Corporation
Whitacre Eugene M.
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