Electric lamp and discharge devices: systems – Cathode ray tube circuits – Pulse storing
Patent
1992-06-25
1996-04-16
Pascal, Robert J.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Pulse storing
315 85, 315370, 363 21, H02M 3335
Patent
active
055085881
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 as 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: 4164775 (1979-08-01), Slegers
patent: 4530550 (1985-07-01), Kondo
IEEE Standard Dictionary of Electrical and Electronics Terms, Third Ed. 1984 p. 377.
Pascal Robert J.
Shingleton Michael B.
Thomson Consumer Electronics S.A.
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