Patent ID: 8368572
Filing Date: 2013-02-05
Classification: G01K

Abstract:
1. A detecting device comprising: a detecting element to one end of which a first constant voltage is applied, and an electrical resistance value of which varies in accordance with changes in a physical amount serving as an object of detection; a resistance element having one end connected to another end of the detecting element; a switching element having a first terminal connected to another end of the resistance element, a second terminal controlled to a second constant voltage that is a lower voltage than the first constant voltage, and a control terminal that, when a voltage that is greater than or equal to a predetermined magnitude is applied, sets the first terminal and the second terminal, which are typically in a non-conducting state, in a conducting state; a control unit which, in accordance with a conducting/non-conducting state between the first terminal and the second terminal, controls a voltage applied to the control terminal such that a potential difference between the one end of the detecting element and the other end of the resistance element is maintained at a predetermined potential difference; and an AD converter that converts, into a digital value, a potential obtained by a potential difference between the first constant voltage and the first terminal being voltage-divided at the detecting element and the resistance element that is connected to the other end of the detecting element, and at which a first reference potential is the first constant voltage and a second reference potential is a voltage applied to the first terminal.