Power converter and the air conditioner

PROBLEM TO BE SOLVED: To provide a power conversion device capable of reducing a malfunction caused by a switching noise.SOLUTION: The power conversion device includes: a constant voltage output circuit 20 which outputs a constant voltage; an active filter control circuit 21 etc. operated based on the constant voltage applied from the constant voltage output circuit 20 through a power supply line V, to control switching elements 122, 130, 210 to perform power conversion; diode element D0-D3 connected in a forward direction on the V power supply line from the constant voltage output circuit 20 to the active filter control circuit 21 etc.; and capacitors C0-C4 each having one end connected between the diode elements and the active filter control circuit 21 etc., and another end connected to the ground.SELECTED DRAWING: Figure 2