Patent ID: 7771864

Claim:
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.