低功耗反激軟開關(guān)變換器的研究
[Abstract]:At present, switching power supply is widely used in computer, communication, power, traffic, machinery, aerospace, medical and other fields because of its small size, lightweight and high efficiency. With the increasing use of modern portable devices, the performance requirements of switching power supply are also improved, and the volume and conversion efficiency need to reach a higher standard in order to meet the needs of the market. The traditional rectifying and filtering circuit has low power factor and large harmonic current, which causes serious harmonic pollution to the power network. Adding the power factor corrector (PFC),) to the front stage of the converter can effectively improve the power factor of the converter and meet the harmonic correlation standard of the power grid. In addition, the higher the working frequency of the converter, the more the switching loss also increases synchronously. Without decreasing the working frequency of the converter, the improvement of the overall efficiency of the converter depends on the soft-switching technology and the synchronous rectifier technology. Therefore, power factor correction (PFC) technology, synchronous rectifier technology and soft-switching technology are the hot topics in the research of switching power supply. The circuit structure of the low-power flyback soft-switching converter studied in this paper is that the input front stage is boost-type PFC circuit, the intermediate stage is ZCS-PWM (zero-current-switching) flyback soft-switching circuit, and the second stage is synchronous rectifier output circuit. In this paper, the passive power factor correction (PFC) and active power correction (APFC) techniques are compared to determine that this scheme adopts APFC.. Then the paper introduces the development of soft switching technology and synchronous rectifier technology. In this paper, the principle of boost type APFC circuit is analyzed in detail, and the working process of flyback soft-switching circuit is studied in stages, and the derivation process and working waveform analysis diagram are given. Then, a prototype of a flyback soft-switching converter with the back-stage synchronous rectifier output of APFC is designed, and the design method of the main components of the circuit is given. Finally, the system is simulated and the test waveform of the key points of the circuit is given. At the same time, the power factor of the prototype, the harmonic current data, the input voltage regulation, the output load regulation and the efficiency of the whole machine are tested. Through the analysis of the simulation waveform and test data, it is shown that the test indexes of the prototype accord with the expected design requirements, and the correctness of the scheme is verified. Finally, the work of this topic is summarized, and the future research direction is put forward.
【學(xué)位授予單位】:湖南工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM46
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