Electrical power conversion device

An electric power conversion device comprising:

• one or more semiconductor modules, each comprising built-in semiconductor elements, a positive electrode terminal, a negative electrode terminal and a control terminal;
• a control circuit board connected to the control terminal of the semiconductor module, and capable of driving the built-in semiconductor elements;
• a main P bus bar connected to the positive electrode terminal of the semiconductor module, through which direct current power is supplied;
• a main N bus bar connected to the negative electrode terminal of the semiconductor module, through which the direct current power is supplied;
• a capacitor module comprising a first capacitor, a capacitor P bus bar and a capacitor N bus bar, the first capacitor, the capacitor P bus bar and the capacitor N bus bar being molded by capacitor mold resin, the capacitor P bus bar being connected to a positive electrode terminal of the first capacitor, and the capacitor N bus bar being connected to a negative electrode terminal of the first capacitor;
• an input P bus bar connected to a positive electrode terminal of a direct current power source;
• and
• an input N bus bar connected to a negative electrode terminal of the direct current power source, the input N bus bar comprising a first N connection section and a second N connection section, the first N connection section being connected to the capacitor N bus bar, and the second N connection section being connected to the main N bus bar, and the main N bus bar being arranged outside of the capacitor mold resin with which the first capacitor, the capacitor P bus bar and the capacitor N bus bar are molded.