Power supply for a television apparatus

Details Power supply for a television apparatus Power supply for a television apparatus

H - Electricity

04

N

350/109

H04N 5/63 (2006.01)

Patent

CA 1292562

ABSTRACT During a power-up mode of a television receiver power supply, a first run supply voltage is generated by rectifying a retrace voltage in a flyback transformer of a horizontal output stage of the television receiver. The rectified voltage is coupled through a resistor and a diode to a power supply voltage receiving terminal of a load circuit. A voltage regulator that includes a pass transistor regulates the voltage at the terminal during both the power-up and standby modes. During the power-up mode, when the ambient temperature is higher than during the standby mode, the current in the transistor is lowered, as a result of a current that is coupled to the terminal via the diode. This reduces the power dissipation in the transistor during the power-up mode. A second transistor, having a base electrode that is coupled to the anode of the diode, generates a second run supply voltage that is temperature compensated at an emitter electrode of the transistor.

589974

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