Due to global warming and the seriousness of nuclear accidents, electric power generation using nuclear electric power plants and fossil fuels is being replaced by environmentally friendly renewable energy, and electric power shortages are intensifying due to rapid development of convenience devices. Most Power Co., Ltd. is an eco-friendly company that improves the global environmental problem of reducing carbon emissions by improving electric power efficiency. Most Power Co., Ltd. has a solution that improves electric power quality using phase control. We can use phase control to implement voltage optimization, active power factor calibration and voltage stabilization. The best way to improve electric power quality is to improve electric power quality at loads that use electric power. By optimizing the voltage supplied to the load at the load stage and correcting the power factor close to the ideal 1, the best electric power quality can be achieved. All products that use electricity are connected to the outlet to consume the electric power of use, and when the power saving performance is realized in the outlet, the power saving performance of all products connected to the outlet is realized. In addition, it can be implemented as a high-efficiency power saving product by making it into a module and incorporating it into existing products. The circuit is simple and the circuit implementation cost is the cheapest. It can be applied to various applications.