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AC sockets and DC sockets are devices that convert one AC voltage into another (or several) DC voltages through AC input circuits, rectifier circuits, and switching devices. Sockets and power supplies are divided into isolated and non-isolated types. The "isolation" and "non-isolation" mentioned here are all for the power grid.

Isolated socket power supply is also known as off-line socket power supply. It belongs to AC socket and DC socket. It is characterized by high-frequency transformer and optocoupler feedback circuit to isolate the output voltage from the grid, so that the switching power supply meets the requirements. Safety regulations.

The safety of the isolated socket power supply is good, but the circuit is more complicated and the cost is high; the non-isolated socket has a simple power supply circuit, but the safety is poor. It should be selected according to the designed socket, the purpose of the power supply and the safety regulations. For example, according to relevant standards, certain white goods (such as household air conditioners, dishwashers, rice cookers, refrigerators, household electric heaters, etc.) internal control power supplies are allowed to use non-isolated switching power supplies to reduce costs. Because the manufacturer prohibits users from repairing by themselves, it can avoid the occurrence of safety accidents.