Television power supply shutdown circuit

Details Television power supply shutdown circuit Television power supply shutdown circuit

1985-04-29

1987-02-03

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

358243, 358190, H01J 2970, H04N 568

Patent

active

046410643

ABSTRACT:
In a power-up mode, the power supply of a television receiver generates the normal operating level of an energizing voltage. An overload detector generates a first control signal to shutdown the power supply and remove the energizing voltage when an overload condition occurs. A control circuit periodically samples the level of the energizing voltage. When the level is lower than normal, the control circuit generates a second control signal that maintains the power supply in the shut-down mode so as to prevent the power supply from attempting to restart. A third control signal inhibits the generation of the second control signal when an input alternating current voltage that supplies the power to the power supply suffers a voltage drop or blackout for only a short duration.

REFERENCES:
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U.S. patent application Ser. No. 445,776, entitled Shutdown Circuit for a Switching Regulator in a Remote Controlled Television Receiver, in the name of J. E. Hicks, filed 11/30/82.
Technical Information Report No. 006, "Switching Regulator Control IC (AN5900)", Semiconductor Division Matsushita.
Electronics Corporation, published prior to the filing date of this U.S. patent application.
Color Television Basic Service Data Manual for CTC 111 Chassis Series, Cover Sheet and Schematic, pp. 36, 37 of MSC 025, F.S. Tuner Control Module.
U.S. patent application Ser. No. 728,661, entitled Television Power Supply Turn-On Protection Circuit in the names of W. J. Testin et al, filed concurrently with the above-captioned patent application.

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