Electric lamp and discharge devices: systems – Cathode ray tube circuits – Pulse storing
Patent
1996-04-16
1997-09-30
Pascal, Robert
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Pulse storing
361150, 363 21, H04N 929
Patent
active
056729405
ABSTRACT:
A television receiver has a switched mode power supply controller, which may be deflection synchronized, which produces pulses in a power transformer. To power the controller during startup, before the internal power supply has started, a storage capacitor on the power supply input of the controller is coupled through a current limiting resistance to a rectified voltage from the AC mains so as to charge the storage capacitor during first polarity phases of the AC mains. The current limiting resistance includes a positive temperature coefficient (PTC) element which increases its impedance as it heats, to reduce power dissipation after initial connection of the television receiver to AC mains. In addition, a diode is coupled in a current path to the storage capacitor to charge the capacitor to the same polarity during opposite polarity phases of the AC mains. The two paths for charging the capacitor allow a relatively smaller value for the current limiting resistance, which remains coupled to the storage capacitor, and provides sufficient power to the controller without undue power dissipation over a wide range of power mains voltages.
REFERENCES:
patent: 3555343 (1971-01-01), Allen
Bettendorf Justin P.
Laks Joseph J.
Pascal Robert
Sragow Daniel E.
Thomson Consumer Electronics S.A.
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