Television receiver start-up circuit

Details Television receiver start-up circuit Television receiver start-up circuit

1982-08-12

1983-11-15

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

358190, H01J 2970

Patent

active

044158424

ABSTRACT:
A television receiver start-up circuit wherein the conventional start-up transformer is eliminated by initiating horizontal output circuit operation directly from the unregulated B+ driven horizontal driver transformer is disclosed. An astable multivibrator energized by the line referenced unregulated B+ power supply provides a pulsed output to the horizontal driver transformer for initiating oscillation of the horizontal output transistor in initiating television receiver sweep operation.Multivibrator operation is timed out following application of the unregulated B+ thereto for termination of the start-up signal and operation of the horizontal drive circuitry by the television receiver's line isolated power supply in sustaining television receiver operation.

REFERENCES:
patent: 3621134 (1971-12-01), Waring
patent: 3814851 (1974-06-01), Nakagawa et al.
patent: 3947632 (1976-03-01), Giger et al.
patent: 4112465 (1978-09-01), Willis
patent: 4127875 (1978-12-01), Fernsler et al.
patent: 4188641 (1980-02-01), Baker et al.
patent: 4240013 (1980-12-01), Wedam
patent: 4246634 (1981-01-01), Purol

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