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Research and Implementation of 3kW High Power Factor DC/DC Converter

Author: CuiLei
Tutor: ZouYunPing
School: Huazhong University of Science and Technology
Course: Power Electronics and Power Drives
Keywords: PFC Boost ZVS Phase Shift Full Bridge Small Signal Mode Hardware Design UC3854 UC3875
CLC: TM46
Type: Master's thesis
Year: 2011
Downloads: 118
Quote: 1
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Abstract


With the strict requirement of the research organizations and institutions to harmonic, the power factor almost becomes the symbol of greening power supply. And Active Power Factor Correction (APFC) technique is one of the development trends of switching power supply. This system designs a single-phase high power factor DC/DC for higher power consisted of two parts, which are Boost step-up circuit and ZVS phase shift full bridge DC/DC converting circuit.It achieves high power factor and gets the output voltage with well dynamic performances in a broader range.Firstly, the thesis introduces the developing process and research situation about PFC at home and abroad nowadays. Comparing with the advantages and applied scope of various PFC circuits, we fix the final main circuit and control strategy. Namely, The input stage adopts Boost step-up circuit and average current mode control, the secondary stage uses ZVS phase shift full bridge DC/DC converting circuit with clamp diodes on transformer primary.The thesis detailedly analyzes the mathematical model of Boost circuit and phase shift full bridge DC/DC converting circuit. In this way, we design the two-level controller. For non-minimum phase characteristic about the Boost circuit, we design a double-loop controller based on feedback linearization theory. Then we discuss the characteristic about soft switch and duty cycle loss of the phase shift full bridge circuit. And the simulation for this two-level circuit respectively verifies the feasibility of circuit design.After the theory model analysis, we calculate the component parameter for main circuit and control circuit, and build the hardware circuit. The prototype adopts analog circuit based on UC3854 and UC3875 chips. Then, we revise their peripheral circuits to satisfy the request about isolation between main circuit and control circuit.Finally, the experiment result shows that the prototype satisfies all the technology index requirements.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter
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