Remote controlled television receiver power supply

Details Remote controlled television receiver power supply Remote controlled television receiver power supply

H - Electricity

04

N

350/109

H04N 5/63 (2006.01)

Patent

CA 1233563

Abstract A mains rectified DC input voltage is applied to a series-pass regulator to develop a regulated B+ supply voltage. To reduce dissipation in the series-pass transistor, a shunt resistor parallels the series-pass transistor. To place the remote controlled television receiver in the standby-mode of operation, a remote standby control circuit applies an on/off command signal to the horizontal deflection circuit. Operation of the horizontal deflection circuit during the off-state of the command signal is disabled, thereby disabling the flyback transformer derived voltage supplies. A thyristor is placed in series with the shunt resistor and blocks current flow to the B+ supply terminal from the input voltage terminal during standby. To resume run-mode operation, the remote standby control circuit generates the on-state of the command signal to reenable horizontal deflection circuit. Current flowing to the B+ supply terminal from the regulator series-pass transistor also flows in an inductor to induce a voltage that is coupled to the gate of the thyristor to turn on the thyristor and reconnect the shunt resistor in parallel with the series-pass transistor.

498213

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