An active relay tester for passive adaptive binary input circuit

An active relay tester for passive adaptive binary input circuit, wherein the circuit is isolated by the DC-DC power supply DC, an asymmetric bridge rectifier circuit and a photocoupler circuit. The DC-DC power supply for the DC isolation circuit provides a binary input power; photocoupler circuit for opening the intake side located on the strong electric real-time status is transmitted to the weak side, and the main control circuit for monitoring the weak side; not symmetrical bridge rectifier circuit for converting the active input voltage to a fixed polarity voltage to effect input of the adaptive active polarity; upper bridge the asymmetric bridge rectifier circuit wherein a leg lower bridge arm and another series of three high speed diodes, and the other two bridges each having only one fast diode. For the present invention in the form of various types of inputs, binary input to the active polarity, can be adaptive. The present invention is applicable to a relay tester active, passive adaptive binary input circuit.