6 comparisons between linear power supply and switching power supply
1. Input grid filter: Eliminate the interference from the grid, such as the start of the motor, the switching of electrical appliances, lightning strikes, etc., and also prevent the high-frequency noise generated by the switching power supply from spreading to the grid.
2. Input rectification filter: rectify and filter the input voltage of the grid to provide DC voltage for the converter.
3. Inverter: It is a key part of switching power supply. It transforms the DC voltage into a high-frequency AC voltage and plays a role in isolating the output part from the input grid.
4. Output rectification filter: rectify and filter the high-frequency AC voltage output by the converter to obtain the required DC voltage, and at the same time prevent high-frequency noise from interfering with the load.
5. Control circuit: detect the output DC voltage, compare it with the reference voltage, and amplify it. The pulse width of the oscillator is modulated to control 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.
