Power conversion device

A power conversion device comprising:

• semiconductor modules forming a power conversion circuit;
• a cooling unit cooling a temperature of the semiconductor modules;
• a capacitor module electrically connected to the semiconductor module;
• a discharge resistance substrate on which a discharge resistance is arranged, the discharge resistance discharging electrical charge accumulated in the capacitor module;
• a control circuit substrate controlling operation of the semiconductor modules;
• and
• a casing accommodating the semiconductor module, the cooling unit, the capacitor module, the discharge resistance substrate and the control circuit substrate;
• and
• a capacitor casing which accommodates the capacitor module,
• wherein the discharge resistance substrate is arranged between an outer wall surface of the capacitor module and the control circuit substrate, and separated from the outer wall surface and the control circuit substrate in a direction perpendicular to the control circuit substrate,
• wherein the capacitor module comprises a filter capacitor and a smoothing capacitor which smooth a current flowing in the power conversion device, and the capacitor casing forms the outer wall surface of the capacitor module, and
• wherein the discharge resistance substrate is attached to a substrate fixing part which extends outside from the outer wall surface of the capacitor module.

A power conversion device comprising:

• semiconductor modules forming a power conversion circuit;
• a cooling unit cooling a temperature of the semiconductor modules;
• a capacitor module electrically connected to the semiconductor module;
• a discharge resistance substrate on which a discharge resistance is arranged, the discharge resistance discharging electrical charge accumulated in the capacitor module;
• a control circuit substrate controlling operation of the semiconductor modules;
• and
• a casing accommodating the semiconductor module, the cooling unit, the capacitor module, the discharge resistance substrate and the control circuit substrate;
• and
• a capacitor casing which accommodates the capacitor module,
• wherein the discharge resistance substrate is arranged between an outer wall surface of the capacitor module and the control circuit substrate, and separated from the outer wall surface and the control circuit substrate in a direction perpendicular to the control circuit substrate,
• wherein the discharge resistance substrate is arranged parallel to an inner wall surface of the casing between the casing and the cooling unit,
• wherein the capacitor module comprises a filter capacitor and a smoothing capacitor which smooth a current flowing in the power conversion device, and the capacitor casing forms the outer wall surface of the capacitor module, and
• wherein the discharge resistance substrate is attached to a substrate fixing part which extends outside from the outer wall surface of the capacitor module.