Switch socket function introduction

Update:10-05-2019
Summary:

The switch socket mainly includes an input grid filter, […]

The switch socket mainly includes an input grid filter, a input rectifier filter, an inverter, an output rectifier filter, a control circuit, and a protection circuit. Their functions are described below.
(1) Input grid filter: Eliminate interference from the power grid, such as the start of the motor, the on/off of the electric appliance, the lightning strike, etc., and also prevent the high-frequency noise generated by the switch socket from spreading to the power grid.
(2) Input rectification filter: rectify and filter the input voltage of the grid to provide DC voltage to the converter.
(3) Inverter: It is a key part of the switch socket. It converts the DC voltage into a high-frequency AC voltage and functions to isolate the output from the input grid.
(4) Output rectification filter: rectify and filter the high-frequency AC voltage outputted by the converter to obtain the required DC voltage, and also prevent the interference of high-frequency noise on the load.
(5) Control circuit: Detects the output DC voltage and compares it with the reference voltage to amplify and modulate the pulse width of the oscillator, thereby controlling the converter to keep the output voltage stable.
(6) Protection circuit: When the switching power supply has an overvoltage or overcurrent short circuit, the protection circuit stops the switching power supply to protect the load and the power supply itself.