FAST AUTOMATIC TRANSFER SWITCHING CIRCUIT AND CONTROL METHOD THEREOF

According to an aspect of the present disclosure, there is provided a switching circuit including a main power supply circuit connected between power sources and a load, wherein the power sources include a first power source and a second power source, and the main power supply circuit includes a transfer switch connected between the power sources and the load and configured to switch between the first power source and the second power source; and a power electronic switch for turning on or off the main power supply circuit, wherein the power electronic switch is connected between the transfer switch and the load.