Television – Receiver circuitry – Power supply
Patent
1996-12-09
1999-08-24
Peng, John K.
Television
Receiver circuitry
Power supply
315411, H04N 563
Patent
active
059431032
ABSTRACT:
A picture display apparatus includes a non-synchronized self-oscillating switched-mode power supply (SMPS) associated with a line output stage (35) which generates power supply voltages for other elements of the apparatus, the standby state being obtained by stopping the line scan. The switch (1) of the SMPS is a MOS-type field effect transistor, and it is turned on by a winding (6) which is magnetically coupled to a ballast inductance (5), this winding (6) having one end connected to the connection point (50) between the switch and the ballast inductance, and generates, at its other end (51), a control voltage which is in phase opposition with the voltage generated in the ballast inductance, the control voltage being transmitted to the gate of the field-effect transistor (1). A capacitor (42) is arranged as a shunt across the drain-source path of the FET and creates an oscillating circuit together with the ballast inductance (5).
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European search report, for application No 96203524.2 of Dec. 12, 1996, search date Mar. 24, 1997. U.S. patent application paper number 4, Apr. 1997.
Decraemer Alain
Dormet Jean-Claude
Boughner Stephen Thomas
Goodman Edward W.
Peng John K.
U.S. Philips Corporation
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