REMOTE CONTROL CIRCUIT FOR POWER SOURCE SWITCH

摘要

PURPOSE:To operate a power source relay from an operating system by the use of a power source for transmitting a control signal thereby to reduce the number of wires of a cable connecting an operating system to the main body by using an auxiliary power source as a power source for driving a comparison circuit for detecting a current and a power source relay. CONSTITUTION:An auxiliary power source charged to a capacitor 12 through a resistor 5 and a diode 6 from between an AC source 1 and a single-pole single- throw relay contact 28 and formed by a rectified voltage, is connected to one l1 of connection wires connected with ON-OFF switches through a second impedance (resistors 22 and 25). A voltage fall of the second impedance caused by the turning ON is detected, and an exciting current is caused to flow from the auxiliary power source to a coil 30 for exciting the single-pole single-throw relay.