Deflection and power supply circuit with reduced start-up drive

Details Deflection and power supply circuit with reduced start-up drive Deflection and power supply circuit with reduced start-up drive

H - Electricity

04

N

350/101

H04N 3/16 (2006.01) H03K 4/62 (2006.01) H03K 4/64 (2006.01) H04N 3/185 (2006.01)

Patent

CA 1154153

ABSTRACT RCA 74,394 In a remote controlled television receiver, the regulator circuit of the main television receiver power supply is made responsive to a remote on/off command signal in order to turn the receiver on and off. A deflection flyback transformer provides operating voltages to the ultor supply and other auxiliary supplies which power such load circuits as audio and vertical deflection. A horizontal output transistor is coupled to a B+ operating voltage terminal of the main power supply through a flyback trans- former primary winding. After initiation of the on-state of the command signal, the regulator circuit rapidly develops a B+ operating voltage. The initially uncharged filter capacitors of the auxiliary supplies act as a low impedance shunt across the flyback transformer primary winding during the start-up interval. To limit the horizontal output transistor collector current and power dissipated during start-up, the horizontal driver stage holds the forward base current supplied to the horizontal output transistor each deflection cycle during start-up below the steady-state value.

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