Electricity: motive power systems – Motor-reversing – Periodic- or intermittent-reversing
Patent
1984-11-26
1986-03-11
Shoop, Jr., William M.
Electricity: motive power systems
Motor-reversing
Periodic- or intermittent-reversing
318293, 318345C, H02P 122
Patent
active
045756627
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.
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General Motors Corporation
Ro Bentsu
Shoop Jr. William M.
Sigler Robert M.
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