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Research of Boost PFC Based on Interleaved Control

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Tutor: NanYuRong
School: Zhejiang University of Technology
Course: Detection Technology and Automation
Keywords: Boost PFC,power factor correction,critical mode (CRM),interleaved
Type: Master's thesis
Year:  2011
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With the high speed to the development of power electronics technology and the subsequent popularity of various applications of power electronic devices, people pay more attention to the harmonic pollution in power system. Switching power supply has become one of the most important harmonic source. The power factor correction technology can effectively improve the efficiency of the operational efficiency, improve power quality and reduce the harmonic pollution. Therefore, power factor correction circuit has become one of the research hotspots in the field of power electronics.The circuit of the Boost converter is sample, small and the loss caused by diode reverse recovery current. So the boost topology is widely used in power factor correction circuit. However, due to large input current ripple, the circuit need to pre-level EMI filter, and the switching losses is also large. So the boost topology is generally used only to low-power application. This paper focuses on the research of Boost PFC based on interleaved control under critical mode (CRM), and a phase-shift circuit is designed. Using interleaving technology, the input current ripple and high frequency electromagnetic interference are significantly reduced. Therefore, the boost topology can be applied to high-frequency high-power situation.Firstly, the paper introduces the power factor correction technology, and pointed out the main areas about PFC. Based on the research, Interleaved Boost PFC has been studied. Taking the single-phase Boost PFC for example, the operating principle under CRM is introduced, and the switching characteristics of the circuit are obtained. Compared single-phase and two-phase, it¡¯s analyzed to the advantages of interleaving technique. It also presents the changes about the input current and output voltage ripple.And then the basic control strategy for interleaved CRM Boost PFC converters where the slave converter is synchronized to the turn-on instant. It is pointed out that the most difficult is how to achieve the exact phase delay. This paper presents a fast phase-shift circuit which can achieve precise 180¡ãphase shift and the master and slave converters can work ideally under CRM. Through the simulation about the phase-shift circuit, the feasibility and reliability of the design is verified. On the basis of integrated control chip MC33262, a master-slave control prototype based on interleaved Boost PFC is built. The master converter is controlled by the master control chip, the turn-on drive signal of the slave converter is generated by the phase-shift circuit. Because the main parameters about the master and slave converters are same, we just design the parameters of the master converter.Finally, the problems encountered in the experiment were analyzed and summarized, then presented the approach to solve the problems. Through analyzing the experimental waveforms, it is verified that the theoretical analysis and circuit design are both correct. It is shown that the converter can work in stable operation, achieve the high power factor.
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