| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply system change-over mechanism which is capable of quickly changing power sources supplying power without causing power failure in a power source to which another power source is changed over. SOLUTION: If either of power sources which supply power to loads independent of each other gets out of order, for example, the power sources are changed so that the load is supplied with power from the other sound power source. In this change-over, a computing controller 64 selects loads so that the other power source is not overloaded, and, after judging whether the inrush current is not more than an allowable value when a bus connection switch is closed, closes the bus connection switch to change the power supply systems so as to supply power from the other power source. Thus, the sound power source is not overloaded, the probability that excessive voltage drop is not caused due to inrush current is eliminated, and power failure is not caused in the power source to which the defective power source is changed over. |
