CHANGEOVER SWITCH CIRCUIT FOR DRIVING ACTUATOR, CAPABLE OF PREVENT DARK CURRENT BY OUTPUTTING CONTROL CURRENT BY USING TRANSISTOR

摘要

PURPOSE: A changeover switch circuit for driving an actuator to prevent dark current is provided to prevent the generation of the dark current due to a switching operation of the changeover switch circuit by using a transistor for outputting control current. CONSTITUTION: A first switching unit slides along a contact point in order to generate a first control signal, a second control signal, and a third control signal. A relay unit(13,14) generates a first driving signal or a third driving signal by the first control signal or the third control signal of the first switching unit. A second switching unit(16) generates a second driving signal by the second control signal of the first switching unit. A control unit(21) generates a predetermined amplification signal by the second driving signal. A current mirror unit(15) is triggered by the amplification signal of the control unit and transfers the first control signal or the third control signal to a load terminal.