Short-term power dropout arrangement useful in a television rece

Details Short-term power dropout arrangement useful in a television rece Short-term power dropout arrangement useful in a television rece

1979-06-27

1981-02-03

Hix, L. T.

Electrical transmission or interconnection systems

Switching systems

Switch actuation

307200B, 307142, 365228, H01H 8300

Patent

active

042490898

ABSTRACT:
The control portion of a television receiver includes a flip flop which when supplied with operating power stores a binary signal having either an "on" level corresponding to the on condition of the receiver or an "off" level corresponding to the off condition of the receiver. In addition to a user responsive input arrangement for selectively controlling the level of the binary signal, a switching circuit is coupled to the flip flop to return the binary signal to its prior level after power line dropouts having less than a predetermined duration, and otherwise causing the binary signal to have its "off" level. The switching circuit is rendered operative at the end of power line dropouts to cause the binary signal to have its "on" level if an enabling signal selectively developed by a circuit including a capacitor and a diode connected between the flip flop and capacitor during the presence of operating power is still stored in the capacitor.

REFERENCES:
patent: 3558912 (1971-01-01), Spall
patent: 3575612 (1971-04-01), Lunn
patent: 3786282 (1974-01-01), Orndorff
patent: 4052701 (1977-10-01), Leuschner
patent: 4056808 (1977-11-01), Benhamou
patent: 4099372 (1978-07-01), Beyers
"COP Microcontroller Family Chip User Manual", National Semiconductor, FIG. 2.4, p. 12, Sep. 1978.

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