Working principle of electronic rectifier

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Working principle of electronic rectifier [Copy link]

During the stable operation of the lamp circuit, the voltage on the lamp tube is stable, so the lamp power mainly depends on the size of the lamp current, and the size of the lamp current is related to the impedance of the rectifier element and the level of the power supply voltage, and the power supply frequency also affects the operation of the fluorescent lamp. For example, for inductor rectification, the impedance of the rectifier inductor ZL=2πfL, the inductance of the inductor rectifier is related to its winding turns and the size of the iron core, so when the power supply frequency is high, the volume of the rectifier inductor will be smaller. This is why the volume and size of the rectifier inductor will be very small after adopting the high-frequency AC electronic rectifier circuit. At present, some famous colleges and universities, scientific research institutes, and companies in the world have invested a lot of efforts in the research, development, and production of high-frequency AC electronic rectifiers. For example, the research center led by Professor Li Zeyuan of the Power Electronics Research Center (VPEC) of the University of Virginia in the United States publishes relevant papers and experimental reports in the IEEE Power Electronics Journal every year, and puts forward concepts such as high-frequency energy feedback and electronic rectifiers using charge pump power factor correction. Professor S.CUK of the California Institute of Technology (UCT) in the United States has single-stage high power factor electronic rectifiers, a Class E electronic rectifier for compact fluorescent lamps. Some famous universities, research institutes, and companies in Spain, Brazil, Taiwan and Hong Kong have invested some high-level scientific researchers and laboratories in scientific research and development. At the same time, some famous domestic research institutes and universities have invested a lot of effort in scientific research and development. This can be seen from relevant domestic scientific and technological literature. However, there is no doubt that my country is a major producer of electronic rectifiers in the world, and there are many companies and enterprises engaged in the production of such "green electric light source" products. Especially since the late 1980s and early 1990s, technical standards such as IEC928 (1990), GB15143 (1994) "General and safety requirements for AC electronic rectifiers for tubular fluorescent lamps" and IEC929 (1990), GB/T15144 "Performance requirements for AC electronic rectifiers for tubular fluorescent lamps" have been promulgated and implemented one after another, providing unified technical specifications for the research, development and production of AC electronic rectifiers. Since high-frequency AC electronic rectifiers require small size and low cost, and have strict requirements on technical indicators such as electromagnetic radiation interference, input power factor, crest factor, and reliability, it is not easy to make a high-frequency AC electronic rectifier that meets the requirements of high performance, low price, small size, low electromagnetic radiation interference, and safe and reliable use. Therefore, people often feel that it seems to be a simple electronic product, but it has a high technical content. It is an electronic product involving circuit topology, high-frequency electronic conversion, resonant switch (ZVS, ZCS), LC series, parallel resonance, power factor correction (PFC), electromagnetic interference suppression (EMC, EMI), signal sensing, acquisition and control, electronic components, electric light source devices and other aspects of power electronics technology. At the same time, how to measure the technical parameters of high-frequency AC electronic rectifiers, such as power, high-frequency harmonic components, efficiency, and electromagnetic radiation interference (EMI), is also a research hotspot for high-frequency AC electronic rectifiers.