Patent ID: 9178426
Filing Date: 2015-11-03
Classification: H02M

Abstract:
1. A three-phase alternating-current power supply switching circuit connected to three first input terminals for respectively receiving a first phase, a second phase, and a third phase that form a three-phase alternating current and connected to a second input terminal for receiving a fourth phase being an N phase, said three-phase alternating-current power supply switching circuit comprising: three output terminals that respectively correspond to said three first input terminals; a first operation circuit that is set to any of a first conductive state and a first non-conductive state; a first contactor that is controlled by said first operation circuit; a second operation circuit that is set to any of a second conductive state and a second non-conductive state; and a second contactor that is controlled by said second operation circuit, wherein said second operation circuit is set to: said second contactor includes an internal switch, said internal switch is set to: said second contactor: said first operation circuit is set to: said first contactor: