Patent ID: 8487578
Filing Date: 2013-07-16
Classification: G01D

Abstract:
1. A position sensing device configured to output a voltage signal to an electronic control unit according to a movement of a detected object, the electronic control unit being configured to control the movement of the detected object, the position sensing device comprising: a movement detection unit configured to output the voltage signal according to the movement of the detected object; a buffer unit configured to implement buffer amplification on the voltage signal of the movement detection unit; a current detection unit configured to detect a direction of an electric current, which flows through a wiring portion between a pull-up resistor element or a pull-down resistor element and the buffer unit, the pull-up resistor element or the pull-down resistor element being electrically connected to the wiring portion such that the electronic control unit receives a voltage signal, which enables control of the movement of the detected object, on a safe side, on disconnection of the wiring portion; a power-supply-voltage detection unit configured to detect decrease in a power supply voltage applied to the movement detection unit; and a voltage switching unit configured to set the voltage signal, which is outputted to the electronic control unit through the wiring portion, on a high-voltage side or a low-voltage side according to the direction of the electric current detected by the current detection unit, when the power-supply-voltage detection unit detects decrease in the power supply voltage.