Patent ID: 6940246
Filing Date: 2005-09-06
Classification: E05F,E05Y,H02H,H02P

Abstract:
1. A power-window jamming preventing apparatus, comprising; a current sensing circuit, which senses a motor current flowing through a motor for driving a window glass; a current limiting circuit, which increases and decreases the motor current based on a current-limitation control signal outputted from the current sensing circuit when an amount of increase of the motor current exceeds a predetermined vale; and a jamming determining circuit, which determines a jamming of a foreign matter in the window glass based on increase of the motor current to reverse a rotation of the motor, wherein the current sensing circuit includes; wherein the current following circuit includes: the apparatus, further comprising a potential difference generating circuit, which monitors a power source voltage supplied to the current sensing circuit and the power window motor, and which clamps the third reference voltage so as to drop a constant voltage from the third reference when the power source is low, such that a potential difference between the second reference voltage and the third reference voltage is kept greater than a predetermined voltage.