Patent ID: 8963530
Filing Date: 2015-02-24
Classification: G01K,H03K

Abstract:
1. A multi input circuit, comprising: a first terminal being supplied with sensing signals of a current means, an RTD (Resistance Temperature Detector) temperature sensor, and a TC (Thermo-Coupler) temperature sensor; a second terminal being supplied with a compensation signal of the RTD (Resistance Temperature Detector) temperature sensor and a sensing signal of a voltage means; a third terminal being supplied with a common signal of the current means, the RTD (Resistance Temperature Detector) temperature sensor, the TC (Thermo-Coupler) temperature sensor, and the voltage means and being grounded; a current means sensing signal detection unit connected between the first terminal and the third terminal; a multiplexer of which input ports are each connected to the first to third terminals and to an output end of the current means sensing signal detection unit; a key input unit selecting the input ports for receiving the sensing signals from the multiplexer; a power supply unit supplying power for sensing a change in a resistance value of the RTD (Resistance Temperature Detector) temperature sensor; a switch turning-on/off power supplied to the RTD (Resistance Temperature Detector) temperature sensor from the power supply unit; and a control unit outputting a control signal selecting the input ports of the multiplexer and a control signal controlling the turn-on/off of the switch according to the selection of the key input unit receiving the sensing signal input to the input port of the multiplexer.