Patent ID: 9537481
Date: 2017-01-03
CPC Classifications: G01J,G08B,H03K

Claim:
1. A semiconductor relay device of a direct current insulation type for use in an object detecting sensor, which comprises: a signal input unit to which an alternating current signal for relay driving purpose is inputted; a direct current insulation member to insulate a direct current signal component from the alternating current signal; a voltage multiplying circuit to multiply a signal voltage, after the insulation of the direct current signal component, by an integer number; and a relay circuit including two metal-oxide semiconductor field-effect transistors having respective sources connected with each other and connected in a reverse series and also having respective gates connected with each other, those metal-oxide semiconductor field-effect transistors being caused to undergo a bidirectional ON-OFF operation when the respective gates of those metal-oxide semiconductor field-effect transistors are brought into a conducting state by a signal of which voltage has been multiplied by the voltage multiplying circuit, wherein provision of the alternating current signal is controlled by a microcomputer of the object detecting sensor based on an object detection.