Patent ID: 6977518

Claim:
An electrical leak detecting apparatus that detects an electrical leak of a power supply device including a DC/DC conversion circuit in which a DC voltage supplied from a DC power supply is chopped and boosted to a desired level by an insulated transformer so as to be outputted through its rectification and smoothing and a DC/AC conversion circuit that converts the DC voltage outputted from the DC/DC conversion circuit into an AC voltage, the power supply device being operable electrically insulated from ground so as to supply the AC voltage to a load, the electrical leak detecting apparatus comprising: two voltage division elements which have an identical impedance value and which are connected to each other in series between one of input terminals and output terminals of the DC/AC conversion circuit; a detection element which has one end connected to a junction of the two voltage division elements; a capacitor which is inserted between an other end of the detection element and ground, that isolates the electrical leak detecting apparatus from ground; a decider which receives a voltage drop across the detection element as a detection signal and processes the detection signal to judge an occurrence of the electrical leak.