Power supply device

A power supply device comprising:

• a first voltage generator having a first coolant path allowing a coolant for cooling the first voltage generator to pass therethrough;
• a second voltage generator having a second coolant path allowing the coolant for cooling the second voltage generator to pass therethrough;
• a first cooling system supplying the coolant to a coolant intake side of said first coolant path;
• a second cooling system supplying the coolant to a coolant intake side of said second coolant path;
• a coolant discharge path connected to both of a coolant discharge side of said first coolant path and a coolant discharge side of said second coolant path;
• a first temperature sensor attached to said first voltage generator;
• a second temperature sensor attached to said first voltage generator on the coolant discharge side of said first coolant path, relative to said first temperature sensor;
• and
• a control circuit controlling an operation of each of said first and second cooling systems,
• when said control circuit issues an operation instruction to each of said first and second cooling systems, said control circuit detecting failure in said first cooling system when a temperature difference between temperature detected by said first temperature sensor and temperature detected by said second temperature sensor is larger than a reference value.