Patent ID: 8649193

Claim:
A leakage current reducing apparatus comprising: voltage detection means; an input-side filter; a voltage amplifier unit; and voltage application means, the leakage current reducing apparatus being provided, via a connection line, between a first electric apparatus and a second electric apparatus, wherein the voltage detection means comprises a main winding, and a winding for leakage current detection, the main winding is provided, via the connection line, between the first electric apparatus and the second electric apparatus, so that a leakage current flowing in the connection line is detected, as a detected voltage, by the winding for leakage current detection, the detected voltage is inputted to the input-side filter, and the input-side filter outputs a detected signal by adjusting the amplitude and the phase of the detected voltage for each frequency, the voltage amplifier unit amplifies the detected signal from the input-side filter, and outputs the amplified signal as an output voltage, the voltage application means generates, on the connection line, an application voltage for reducing the leakage current, based on the output voltage, and the input-side filter reduces a frequency component in the detected signal at which the phase of the output voltage inverts from the phase of the detected voltage.