External grid power supply and self-generated power supply conversion circuit

In order to avoid production losses caused by power outages from external power grids, some companies are equipped with self-generated power generation equipment. However, sometimes in a hurry
, it is easy to accidentally send the self-generated power to the external power grid , or send it back to the generator when the external power source comes in , endangering the safety of people and equipment. A conversion circuit as shown in the figure can be used for this purpose .