In the past, the purpose of using the AC power supply was to provide the voltage and frequency of the utility power in various countries and to simulate various phenomena of abnormal power quality. With the development of new energy sources, in addition to using AC power as input, communications and server power supplies can also directly input DC power (HVDC or LVDC) from UPS or energy storage devices to save power consumption from AC to DC conversion.

In addition, the DC mode of the AC power supply has a faster voltage change response time (compared to the DC power supply), this characteristics can meet the testing needs of vehicle-mounted electrical equipment, and this White Paper will comprehensively describe these applications.