| 摘要 |
PROBLEM TO BE SOLVED: To improve the degree of freedom of design and make a cabinet compact by averaging a temperature of each converter device by controlling an output of each of the converter devices. SOLUTION: The temperature of converter devices 31a-31c constituting a power supplying part 21a is detected with temperature sensors 32a-32c. When difference is generated in detection signals of the sensors 32a-32c, a second control unit 45 outputs a voltage sharing signal to a synthetic control unit 46 so as to eliminate the difference, controls voltage sharing circuits 33a-33c, and sets voltage sharing of the converter devices 31a-31c changeably. As a result, the heating value of each of the converter devices 31a-31c is changed, and a relative temperature in the cabinet is held to be the same value. On the basis of a difference voltage between an output voltage detected with an output sensor 41 and a reference voltage from a reference voltage circuit 42, a first control unit 44 and the synthetic control unit 46 control the voltage sharing circuits 33a-33c in such a manner that an output voltage of the power supplying part 21a coincides with the reference voltage. |
