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

1979-11-19

1981-08-04

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

315408, H01J 2970, H01J 2976

Patent

active

042824605

ABSTRACT:
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 transformer primary winding. After initiation of the on-state of the command signal, the regulator ciruit 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.

REFERENCES:
patent: 3949403 (1976-04-01), Yoshida et al.
patent: 4024577 (1977-05-01), Diethelm
patent: 4112465 (1978-09-01), Willis

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