LEAKAGE DETECTION/DIAGNOSIS CIRCUIT AND POWER SUPPLY DEVICE HAVING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a leakage detection/diagnosis circuit and a power supply device therewith, which implement high leakage detection accuracy and high reliability diagnosis of leakage detection performance of the circuit.SOLUTION: A leakage detection/diagnosis circuit 2 includes: a signal line 8 insulated from power supplying wires 4 for supplying power; a signal generation section 5 for generating and outputting to the signal line 8 a diagnostic signal Scorresponding to a leakage current Ithat can appear on the power supplying wires 4; a zero-phase current transformer 61 passing the power supplying wires 4 and the signal line 8 through a primary side 611 to induce an induced current Iin a secondary side winding 612 on the basis of the diagnostic signal Soutput to the signal line 8; a leakage detection circuit 62 for detecting a leakage on the basis of the induced current Iand outputting a leakage detection signal S; and a microcontroller 7 for diagnosing leakage detection performance of the circuit 2 on the basis of the leakage detection signal S.