Electrical leak detecting apparatus
First Claim
1. 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.
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Accused Products
Abstract
An electrical leak detecting apparatus for detecting electrical leak of a power supply device includes two voltage division elements which have an identical impedance value and are connected to each other in series between input terminals or output terminals of a DC/AC conversion circuit of the power supply device, a detection element which has one end connected to a junction of the voltage division elements, a capacitor which is inserted between the other end of the detection element and ground and a decision member which receives a voltage drop across the detection element as a detection signal and processes the detection signal so as to judge occurrence of the electrical leak.
28 Citations
11 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification