Power conversion device

A power conversion device provided between a DC positive bus, a DC negative bus and a DC neutral point bus, and an AC line, to perform power conversion between DC power and AC power, the power conversion device comprising:

• a first semiconductor element having a first electrode connected to the DC positive bus;
• a second semiconductor element having a first electrode connected to a second electrode of the first semiconductor element, and a second electrode connected to the DC neutral point bus;
• a third semiconductor element having a first electrode connected to the DC neutral point bus;
• a fourth semiconductor element having a first electrode connected to a second electrode of the third semiconductor element, and a second electrode connected to the DC negative bus;
• a fifth semiconductor element having a first electrode connected to the first electrode of the second semiconductor element, and a second electrode connected to the AC line;
• and
• a sixth semiconductor element having a first electrode connected to the AC line, and a second electrode connected to a second electrode of the third semiconductor element, wherein
• each of the first to sixth semiconductor elements includes at least one semiconductor switching element, and at least one diode connected in anti-parallel with the at least one semiconductor switching element, respectively,
• a breakdown resistance of the first and fourth semiconductor elements to cosmic rays is higher than a breakdown resistance of the second and third semiconductor elements to cosmic rays, and
• a breakdown resistance of the fifth and sixth semiconductor elements to cosmic rays is higher than the breakdown resistance of the first and fourth semiconductor elements.