Deflection and power supply circuit with reduced start-up drive
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. 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 onstate 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 startup 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 startup below the steady-state value.
- Assignee:
- RCA Corp
- Patent Number(s):
- US 4282460
- OSTI ID:
- 6143555
- Country of Publication:
- United States
- Language:
- English
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