| 摘要 |
PURPOSE:To reduce the size of the whole system by mounting an auxiliary power supply for back-up of a main power supply and a device for switching from the main power supply to the auxiliary power supply or vice versa on an electronic components mounting board. CONSTITUTION:On an electronic components 4 mounting board 50, an auxiliary power supply 20 for back-up of a main power supply 1 and voltage supplement 1 element 3 to work as a device for switching from the main power supply to an auxiliary power supply 20 or vice versa are mounted. The capacity of the auxiliary power supply for back-up 20 can be small. By mounting such an auxiliary power supply on the board 50, no special location space is necessary for the auxiliary power supply for back-up 20 when constructing the system with the plurality of the boards 50. By this method, the size of the whole system can be reduced. |
