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:
Mar. 11, 1986
Filed:
Nov. 26, 1984
Richard N Lehnhoff, Kettering, OH (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A control circuit for a one-touch vehicle window control uses a pair of switches, each switch actuating a still window for movement in one of two opposite directions but being effective to stop a window moving in the opposite direction from that which it initiates. The motor is in an H-switch bridge with SCRs and FETs, with each switch providing actuating signals to an SCR and FET for one armature current direction and further providing an actuating signal through an impedance to a discharge transistor connected across a capacitor connected to the gate of the FET for the opposite armature current direction. The base of each discharge transistor is connected to another capacitor and through another impedance to the junction of a FET and a motor armature terminal. Each connected pair of impedances forms a voltage divider to turn off a FET upon the detection of motor stall current therethrough; and the imepedances further act to ensure the non-conduction of the non-activated FET to prevent a short circuit of the power supply.