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2020-04
26
The basic composition of a switching power supply is roughly composed of four major parts: the main circuit control circuit, the detection circuit, and the auxiliary power supply.
1. Main circuit
Impact current limiting: Limits the impact current on the input side at the moment of power on.
Input filter: Its function is to filter out the clutter existing in the power grid and feedback back to the power grid the clutter that hinders the generation of the local machine.
Rectification and filtering: Directly rectifying the AC power supply of the power grid into smoother DC power.
Inversion: Transforming the rectified DC power into high-frequency AC power, which is the core part of high-frequency switching power supply.
Outgoing rectification and filtering: Provide stable and reliable DC power supply according to load requirements.
2. Control circuit
On the one hand, samples are taken from the output end, compared with the set value, and then the inverter is manipulated to change its pulse width or frequency to make the output stable. On the other hand, based on the data provided by the test circuit and identified by the protection circuit, various protection measures are provided for the power supply by the control circuit.
3. Detection circuit
Provide various parameters and instrument data that are currently in operation in the protection circuit.
4. Auxiliary power supply
Implement software (remote) startup of the power supply to provide power for the protection circuit and control circuit (PWM and other chips).
2020-04
26
Power supply is a technology product centered on power electronics. Power supply "is a terminal product, and" power supply "product is a specific product embodiment of" power electronics "application technology. Power electronic power supplies usually refer to power products that use power electronic technology and are an important component of power electronic equipment. The power supply industry, with power electronics as its core technology, is the foundation for the development of various high-tech industries. All high-precision and cutting-edge technology equipment requires technical support from power electronic power supplies. With the rapid development of the IT industry, CI industry, and PC machine. Drive the takeoff of the power supply industry. The power supply industry is widely used in various industries and is inseparable from the national economy. Chinese power supply enterprises have generally been established for a relatively short period of time, with only 11.3 percentage points of enterprises having been established for more than 10 years. At the same time, with the deepening of China's reform and opening up, foreign-funded enterprises and joint ventures are gradually increasing, promoting competition and also providing opportunities and challenges for local enterprises. For the operational status of power supply enterprises, due to strong overall demand, although competition intensifies, the industry's average revenue and profit have both increased. At the same time, in order to have the potential for further competition in the future, Chinese power companies are increasing their research and development efforts and increasing their research and development personnel. Since the 1990s, the power supply industry has experienced explosive development, with the number of enterprises increasing from a few hundred in the early 1990s to tens of thousands today. The production has increased from over a billion yuan in the 1990s to tens of billions of yuan today. And it is still developing rapidly.
2020-04
26
A power module is a power supply that can be directly mounted on a printed circuit board. Its characteristic is that it can provide power for specialized integrated circuits (ASICs), digital signal processors (DSPs), microprocessors, memory, field programmable gate arrays (FPGAs), and other digital or analog loads. Generally speaking, this type of module is called a Point of Load (POL) power supply system or a Point of Use High Power Power Supply System (PUPS). Due to the many advantages of modular structure, modular power supplies are widely used in communication fields such as switching devices, access devices, mobile communication, microwave communication, optical transmission, routers, and automotive electronics, aerospace, etc.
Especially in recent years, due to the rapid development of data business and the continuous promotion of distributed power supply systems, the growth rate of power modules has exceeded that of primary power supply. With the widespread use of semiconductor technology, packaging technology, and high-frequency soft switching, the power density of modular power supplies is increasing, the conversion efficiency is becoming higher, and applications are becoming simpler.
The power module uses an AC/DC converter controlled by an integrated chip with excellent characteristics, which has excellent off screen anti-interference characteristics and electromagnetic compatibility. The pin uses 5PIN, 24PIN and other dual in-line plug, and is packaged with metal copper and high flame retardant plastic shell. It can operate without any external peripheral components.


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