Power switch

Details Power switch Power switch

1983-08-24

1985-08-27

Eisenzopf, Reinhard J.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307141, 3071414, 307597, 361196, H01H 4300, H03K 1728

Patent

active

045380740

ABSTRACT:
An improved power switch circuit for turning on manually and for turning off either manually or automatically a battery operated electronic instrument. The circuit includes one manual momentary contact on/off switch, a bilateral switch or transmission gate, a microprocessor, and a capacitor that charges to a threshold level when the on/off switch is momentarily closed (on) and that discharges when either the on/off switch is momentarily closed again (off) or after a fixed amount of time has elapsed as determined by the microprocessor. The bilateral switch is switched on when the threshold potential is reached thereby preconditioning the on/off switch for turning the instrument off. The on/off switch can now be closed to discharge the capacitor or the microprocessor can discharge the capacitor thereby switching off the bilateral switch and preconditioning the on/off switch for again turning on the power to the electronic instrument.

REFERENCES:
patent: 3621276 (1971-11-01), Mitchell
patent: 4112764 (1978-09-01), Turner
patent: 4134027 (1979-01-01), Scott et al.
patent: 4267467 (1981-05-01), Tsukoda
patent: 4359655 (1982-11-01), Fukui

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