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Single-Stage Power-Factor-Correction Techniques

Author: XuHuaMin
Tutor: YanYangGuang
School: Nanjing University of Aeronautics and Astronautics
Course: Power Electronics and Power Drives
Keywords: Power Factor Correction Input current shaping Forward Converter Flyback converter Active clamp Discontinuous current mode Continuous current mode Boost Converter Buck-Boost Converter
CLC: TP212
Type: PhD thesis
Year: 2002
Downloads: 1519
Quote: 19
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Abstract


In low-power applications, in order to reduce the device and cost, single-stage power factor correction (PFC) technology is more and more people pay attention. The single stage PFC techniques is the integrated PFC stage and DC / DC stage, common switch and control circuit, while improving the power factor and fast adjustment of the output voltage. In this paper, a single-stage PFC technology analysis and research, is divided into six chapters. Chapter Passive PFC technology, active two PFC technology and active single-stage PFC technology analysis and comparison, and pointed out their advantages and disadvantages, and the scope of application, and draw a single-stage PFC technology is applicable to small Power occasions, is the inevitable trend of development in low-power applications of PFC technology, is also a hot PFC technology. Chapter II of the existing single-stage PFC converter topology analysis, pointed out in a single-stage PFC converter, IEC1000-3-2 standard for quick adjustment of the output voltage to the input current harmonic content, must solve the two problems: how to achieve the input current shaping and control energy storage capacitor voltage under 450V. The single-stage PFC topology Boost-type structure and Buck-Boost-type, single-stage PFC Boost converter can also be divided into both ends of the mode and three-terminal mode two, summed up their general model, elaborated between them conversion as well as mutual conversion law, which some existing single-stage PFC converter topology topology. Chapter transformer windings of the three negative feedback of the single-stage PFC converter study shows the performance of the three topologies similar, and mutual conversion between them, to verify the proposed conversion law. The research results indicate that the transformer winding negative feedback inhibition of the energy storage capacitor voltage have a good effect, but also increase the device less simple structure. Chapter IV presents a novel single-stage PFC converter, energy storage capacitor voltage transformer winding negative feedback inhibition. This chapter analyzes the circuit state to complete the circuit design and experimental verification. And compared with other single-stage PFC converter, draw new topology has a simple structure, low input current harmonic content, low voltage energy storage capacitor, suitable for low-power applications. The fifth chapter of a the DCM flyback single-stage PFC converter. The theoretical analysis and circuit parameters determine the flyback converter for PFC function based on the concept of \RCD snubber circuit flyback converter loss analysis, pointed out that the leakage inductance of the voltage rating of the efficiency of the converter, the device play a decisive role in influencing the converter in the actual application. Flyback active clamp circuit simulation and experiment. Flyback active clamp circuit in the case of a fixed duty cycle, due to the magnetizing energy of the transformer can be bi-directional flow, there is competent when opened the magnetizing inductance and the leakage inductance energy fed back to the input terminal, so that the distortion of the input current, and reduces the input power factor. If the design of a flyback active clamp circuit operates in continuous current mode control the duty cycle of the input current to follow the input voltage can improve the input power factor. Summary of Chapter VI of this work are summarized.

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