High-voltage output loop open circuit detection circuit

The utility model relates to the technical field of high-voltage detection, in particular to an open-circuit detection circuit for a high-voltage output loop, which comprises a high-voltage isolation optocoupler circuit, a delay transmission circuit and a control signal receiving circuit. One end of an optocoupler U1 of the high-voltage isolation optocoupler circuit is connected with the high-voltage loop through a resistor R2; the delay transmission circuit comprises an RC charging circuit, a reverse breakdown diode Z2 and a triode Q1, a collector electrode of the triode Q1 is connected with a power supply VDD, an emitter electrode is grounded, and a base electrode is connected with the reverse breakdown diode Z2 in series and then connected to one end of the capacitor; the control signal receiving circuit comprises a relay K1 and a grounding triode Q2, a collector electrode of the grounding triode Q2 is connected with one end of the relay K1, and the other end of the relay is connected with the high-voltage