Power switch
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 27, 1985
Grant Date -
N/A
app pub date -
Aug 24, 1983
filing date -
Aug 24, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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