CRM Buck PFC變換器的變導(dǎo)通時(shí)間控制研究
[Abstract]:In production and daily life, the power supply of power electronic equipment is mostly direct current, while the power supply of power grid is usually alternating current, so it is necessary to carry on AC-DC conversion. The earliest capacitive filter uncontrollable bridge rectifier circuit, AC input side current waveform distortion is serious, contains more harmonic components, the need for power factor correction technology to reduce harmonic, When the power factor. Buck PFC converter works in CRM mode, the switching frequency varies with the input voltage in the power frequency, and the frequency range is relatively large, resulting in a large switching loss. Also can produce EMI and other adverse effects. In view of the traditional peak current control method, a variable conduction time control strategy is proposed. A certain amount of third harmonic is injected into the peak current reference signal, and the on-on time, turn-off time and switching period are all changed in the power frequency cycle. Find the optimal third harmonic, reduce the maximum switching frequency of the converter, minimize the switching frequency range, enhance the performance of the converter. The Buck topology of AC-DC transform has a defect, when the input voltage is less than the output voltage, The converter does not work, and the input current has a partial dead zone, which causes the power factor to be lower than other topologies. A variable conduction time control strategy is proposed for the traditional control method of fixed conduction time. A certain inverse third harmonic is injected into the peak current reference signal to cancel the original content. The third harmonic function and the conduction time function can be obtained when the PF is maximum. The control process of the circuit is designed. Reduce its harmonic content, improve power factor, optimize other performance, enhance its engineering application. Finally, in order to verify the validity of the theoretical analysis, this paper carried out experimental verification. Based on the experimental parameters, a prototype is developed to improve the power factor of CRM Buck PFC converter by changing the switching frequency and changing the on-time control of the CRM Buck PFC converter. The experimental waveforms under different input voltages are given, and the experimental data and results show the validity of the theoretical analysis.
【學(xué)位授予單位】:南京理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TM46
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