Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1987-02-17
1987-12-01
Ro, Bentsu
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318286, 318293, 318434, H02P 122, H02H 708
Patent
active
047106859
ABSTRACT:
A power window control circuit for a motor vehicle includes a FET and SCR in series across the power supply with their junction connected to one side of a motor armature, the other side of the motor armature being switchable between power supply terminals. To provide reverse battery protection, no anti-parallel diode is provided around the SCR. The activation circuit for the FET includes a capacitor bootstrap circuit controlled by a switching transistor and a zener diode from the drain to the gate. When conduction from the switch through the motor and SCR is stopped, the inductive energy from the armature windings dissipates through the internal anti-parallel diode of the FET. When opposite conduction from the FET through the motor and switch is stopped, the inductive energy causes the voltage across the FET to rise to the zener voltage and turn on the FET sufficiently to dissipate it.
REFERENCES:
patent: 4476416 (1984-10-01), Licata et al.
patent: 4496886 (1985-01-01), Gordon et al.
patent: 4562387 (1985-12-01), Lehnhoff
patent: 4575662 (1986-03-01), Lehnhoff
Disser Robert J.
Lehnhoff Richard N.
General Motors Corporation
Ro Bentsu
Sigler Robert M.
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