The principle of switching power supply


The switching power supply mainly includes an input pow […]

The switching power supply mainly includes an input power grid filter, an input rectification filter, an inverter, an output rectification filter, a control circuit, and a protection circuit. Let's take a look at their respective roles: Input Grid Filter: It is used to eliminate interference ripple from light switches such as AC switches, household appliances, switches, air conditioner switches, lightning strikes, etc. It also prevents switching power supplies. The generated high-frequency noise diffuses to the grid; the input rectification filter: it rectifies and filters the grid input voltage to provide DC voltage to the converter; the inverter: it is a key part of the switching power supply. It converts the DC voltage into a high-frequency AC voltage and functions to isolate the output from the input grid. The output rectifier filter: it rectifies and filters the high-frequency AC voltage output from the converter to obtain the required DC voltage, while also preventing High-frequency noise interferes with the load; control circuit: detects the output DC voltage and compares it with the reference voltage for amplification. The pulse width of the oscillator is modulated to control the converter to keep the output voltage stable; the protection circuit: when the switching power supply has an overvoltage or an overcurrent short circuit, the protection circuit stops the switching power supply to protect the load and the power supply itself. The switching power supply is a conversion device that rectifies the alternating current into direct current to supply power.