Vehicle power window control circuit with reverse battery protec

Electricity: motive power systems – Motor-reversing – Armature or primary circuit control

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Details

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

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