Patent ID: 9519253
Filing Date: 2016-12-13
CPC Classification: G03G,H02M,Y02B

Claim Text:
1. An electric power supply device for supplying electric power to a load, said electric power supply device comprising: at least one first relay connected with a live line of an alternating-current voltage source; at least one second relay connected with a neutral line of the alternating-current voltage source; a controller for executing a stopping sequence for rendering Off said first relay and said second relay from On state; and a storing portion for storing information relating to the stopping sequence executed by said controller, said stopping sequence includes a first stopping sequence in which said first relay is rendered Off, and then said second relay is rendered Off, and a second stopping sequence in which said second relay is rendered Off, and then said first relay is rendered Off, wherein when said controller discriminates whether or not the first relay and the second relay fail, said controller executes the second stopping sequence if the storing portion has stored the information relating to the first stopping sequence for a previous stopping sequence.