Solar energy is almost unlimited and can be used in most places. It is the most environmentally friendly energy. The standard PV power conversion system has an isolated or non-isolated first-stage DC-DC converter and a second-stage DC-AC inverter for AC output. In order to meet the safety requirements of the United States, it is usually necessary to isolate PV cells from AC outputs. In Europe and Japan, many inverters are designed with non-isolated topology, which can reduce weight, improve efficiency and reduce cost, but they also need a grounding loop. Protect the circuit from accidental electric shock. For commercial and industrial applications, the typical three-phase power is 10 to 100 kW, which can be served by APS SiC diode and MOSFET solutions.