Patent ID: 7518890

Claim:
A power converter device comprising: a converter part which converts a power from a power source to a DC power; a smoothing part which smoothes an output from the converter part where a first capacitor part and a second capacitor part are connected in series; and an inverter part which converts an output of the smoothing part to an AC power and outputs it; wherein four electrode terminals of the first capacitor part and the second capacitor part are arranged to make a square on a plane; next to a positive electrode terminal of the first capacitor part a negative electrode terminal of the second capacitor part is arranged; next to a negative electrode terminal of the first capacitor part a positive electrode terminal of the second capacitor part is arranged; and a first wiring planar conductor which connects the positive electrode terminal of the first capacitor part and a P phase on a positive electrode side of the inverter part; a second wiring planar conductor which connects the negative electrode terminal of the second capacitor part and an N phase on a negative electrode side of the inverter part, said second wiring planar conductor being arranged so as to mutually overlap with said first wiring planar conductor; and a third wiring planar conductor which connects the negative electrode terminal of the first capacitor part and the positive electrode terminal of the second capacitor part, said third wiring planar conductor being arranged so as to mutually overlap with said first wiring planar conductor and said second wiring planar conductor are provided; wherein a direction of a current which flows in said third wiring planar conductor flows in a direction opposite to a direction of a current which flows in said first wiring planar conductor or said second wiring planar conductor.