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HOME >> What is the difference between switching power supply and normal power supply?
What is the difference between switching power supply and normal power supply?
Source: | Author:pmo89cafb | Published time: 2020-11-02 | 4162 Views | Share:

Switching power supply is a new type of power supply. It has the advantages of high efficiency, light weight, high lifting, voltage reduction and high output power. But because the circuit is in the switch state, the noise is relatively large.


Examples: buck switching power supply
Let's briefly talk about the working principle of buck switching power supply: the circuit is composed of switch (transistor or field effect transistor in actual circuit), freewheeling diode, energy storage inductor, filter capacitor, etc.
When the switch is closed, the power supply supplies power to the load through the switch and inductance, and part of the energy is stored in the inductor and capacitor. Due to the inductance's self inductance, the current increases slowly after the switch is turned on, that is, the output cannot reach the power supply voltage value immediately.
After a certain period of time, the switch is disconnected, because of the self inductance of the inductor (it can be more vividly considered that the current in the inductor has inertial effect), it will keep the current in the circuit unchanged, that is, continue to flow from left to right. This current flows through the load, returns from the ground wire, flows to the positive pole of the freewheeling diode, passes through the diode and returns to the left end of the inductance, forming a loop.