Technical support
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.
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.
In addition to meeting safety requirements, the LED driver circuit should also have two basic functions:
One is to maintain constant current characteristics as much as possible, especially when the power supply voltage changes by ± 15%, the output current should still be able to fluctuate within the range of ± 10%. The main reasons are: 1. To avoid driving current exceeding the rated value, which affects its reliability 2. Obtain the expected brightness requirements and ensure the consistency of brightness and chromaticity of each LED.
The second is that the driving circuit should maintain a low self power consumption in order to maintain a high level of LED system efficiency.
LED driver power supply converts the power supply into a specific voltage and current to drive the voltage converter of LED lighting. Generally, the input of LED driver power supply includes high-voltage power frequency AC (i.e. mains power), low-voltage DC, high-voltage DC, low-voltage high-frequency AC (such as the output of electronic transformers), etc. The output of LED driver power is mostly a constant current source that can change the voltage with the change of LED forward voltage drop value. The core components of LED power supply include switch controllers, inductors, MOSFETs, feedback resistors, input filter devices, output filter devices, and so on. According to the requirements of different occasions, there should also be input overvoltage protection circuit, input undervoltage protection circuit, LED open circuit protection, overcurrent protection circuit, etc.
