Noise reducing device for electric power conversion device

There is provided a noise reduction apparatus that facilitates the use of a current control device having a low breakdown voltage, improving the operating speed and noise compensation capacity, and the high-frequency filter is minimized to reduce manufacturing costs of the electric power conversion device. Noise reduction device of the present invention includes a noise compensation current source is connected to the secondary winding circuit 6A 5d noise current detector 5; 6A noise compensation current source circuit comprises a transistor Tr