The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 08, 1986
Filed:
Jul. 20, 1984
Norman G Planer, Annandale, MN (US);
Zoltan Zansky, Willowdale, CA;
Honeywell Inc., Minneapolis, MN (US);
Abstract
A power-up/power-down safety switch includes a simple, low-cost circuit having one AND gate, which may be a CMOS IC, one voltage-limiting diode and three resistors. The circuit functions in conjunction with a logic control circuit in a manner which assures that the inhibiting voltage to the logic control circuit V.sub.INH is equal to (or slightly less than) the supply voltage, V.sub.CC (t), until V.sub.CC (t) reaches the minimum required supply voltage for the circuit logic to operate properly. V.sub.INH is then rapidly switched to a low state such that the circuit logic operates without interference. Conversely, when the circuit is turned OFF, the value of V.sub.INH is switched to a high state as soon as the supply voltage reaches the minimum value to operate the logic circuit thereby again causing the logic outputs to go low and that all the drive signals to the power switch are in the OFF state.