With the development and innovation of power electronics technology, it makes the switching power supply technology also in constant innovation. At present, the switching power supply to small, lightweight and high efficiency is widely used in almost all electronic equipment, is today's electronic information industry rapid development of an indispensable power supply method. So, here's how switching power supplies work.
Introduction of switching power supply
Switching power supply is a widely used circuit controller, which is often used in the automation control of various industrial machines, communication tools, LED lighting equipment, a variety of common household appliances and so on. It is a power supply that utilizes a pulse controller to control the switching of the circuit to maintain the output voltage. It can be said that switching power supply is widely used in almost all electronic equipment, is an indispensable power supply.
Common switching power supply is mainly divided into two categories, one is DC switching power supply, the other is AC switching power supply.
DC switching power supply is mainly used in poor power quality circuits, it can be poor power quality of the ecological power supply into a better quality of DC voltage, which is conducive to the normal work of a variety of machines. The AC power switch can only work in circuits with better power quality. Therefore, in life, the application of DC switching power supply is very wide, while the application of AC switching power supply is less.
Main Applications
Switching power supply products are widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, electric power equipment, instrumentation, medical equipment, semiconductor refrigeration and heating, air purifiers, electronic refrigerators, liquid crystal displays, LED lamps, communication equipment, audiovisual products, security and monitoring.
Switching Power Supply Working Principle
I. Switching Power Supply Working Principle - - Introduction
Switching power supply is mainly to use the modern power electronics technology, through the control of the electronic switching device on and off time ratio, to maintain the stability of the output voltage. Generally consists of PWM (Pulse Width Modulation) control IC and MOSFET, with small size, light weight, low power, high efficiency. It has been widely used in various fields such as military equipment, industrial automation control, medical equipment, digital products and so on.
Second, the working principle of switching power supply - - structure
Switching power supply is mainly composed of the main circuit, control circuit, detection circuit and auxiliary power supply of four major components. The role of each part is as follows:
The main circuit can be divided into inrush current limiting part, input filtering part, rectifier and filtering part, inverter part, output rectifier and filtering part. Among them, the inrush current limiting part is responsible for limiting the inrush current of the input side at the moment of power on; the input filter part is responsible for filtering the stray wave; the rectifier and filter part is responsible for rectifying the grid AC power to DC; the inverter part is responsible for converting the rectified DC into high frequency AC; the output rectifier and filter part is responsible for providing a stable and reliable DC power supply.
The control section is responsible for controlling the inverter to stabilize the output and provide various protection measures for the circuit.
The detection circuit is responsible for providing various parameters and data during operation.
The auxiliary power supply is used to realize the software (remote) startup of the power supply and supply power for the normal operation of the circuit.
Third, the working principle of switching power supply
The working principle of switching power supply is different from that of linear power supply, linear power supply is to let the power transistor work in linear mode, while the switching power supply is to let the power transistor work in the conduction and shutdown of the two working states, in other words, it is through the "chopping", i.e., the amplitude of the input DC voltage, and the switching power supply is to let the power transistor work in the conduction and shutdown of the two working states. In other words, it is realized by "chopping", i.e. chopping the amplitude of the input DC voltage into a pulse voltage equal to the amplitude of the input voltage. This principle of operation of the switching power supply makes the volt-ampere product added to the power transistor is very small (on-state, low voltage, high current; off-state, high voltage, low current), that is, the power transistor on the loss is very small.
Editor's summary: The information about the principle of switching power supply is introduced here, I hope this article is helpful to you. If you still do not understand what you can leave me a message below Oh, we will answer for you as soon as possible.