Drive circuit system for power window

Details Drive circuit system for power window Drive circuit system for power window

1998-07-20

1999-07-20

Ip, Paul

Electricity: motive power systems

Automatic and/or with time-delay means

Moisture content or wetness

318283, 318444, 318DIG2, E05F 1520, B06J 100

Patent

active

059259973

ABSTRACT:
A drive circuit system includes an opening control circuit Eo adapted to close an opening relay to drive a motor in a window opening direction by operation of a control switch to an opening position, and a closing control circuit Es adapted to close a closing relay to drive the motor in a window closing direction by operation of the control switch to a closing position. The opening control circuit Eo and the closing control circuit Es include final output stage transistors To and Ts, respectively, each of which comprises a PNP-type transistor. When the drive circuit system becomes wet due to the entry or condensation of water or liquid, a leak current I is permitted to flow simultaneously between bases of the final output stage transistors To and Ts and ground 2. Both of the transistors To and Ts are simultaneously turned on to close the opening relay and the closing relay. As a result, opposite ends of a motor are brought into high-potential states, so that the motor cannot be driven, thereby preventing the unintended opening and closing of the power window.

REFERENCES:
patent: 5057754 (1991-10-01), Bell
patent: 5293105 (1994-03-01), West, Jr.
patent: 5300395 (1994-04-01), Hotta et al.
patent: 5416702 (1995-05-01), Kitagawa et al.
patent: 5459380 (1995-10-01), Augustinowicz

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