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Research on Single-Stage Full-Bridge Soft-Switching PFC Technology Based on Digital Control

Author: LiuQingYi
Tutor: ZuoHongQi
School: Harbin Institute of Technology
Course: Electrical Engineering
Keywords: Power Factor Correction Single-stage full-bridge Soft-switching Digital control Average current mode Duty cycle forecast
CLC: TM46
Type: Master's thesis
Year: 2011
Downloads: 94
Quote: 0
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Abstract


Power electronic devices generally use a diode rectifier and capacitor filter power supply, this will give a great deal of harmonic pollution grid; power factor correction technology as an important means of governance harmonic pollution by more and more people concern, has become a current research focus in two aspects of the topology and control strategy of the technology research. In high-power applications, generally opt for the full-bridge structure as the power factor correction converter topology, however, the full-bridge converter transformers original side leakage inductance in the circuit commutation process to produce large voltage spikes, which add big switch voltage stress. This article to solve this problem via an increase in the full-bridge converter active clamp circuit, the clamp circuit is capable of absorbing voltage spikes, and will be at a specific time to the release of the stored energy to a load side; while the clamp circuit to the auxiliary bridge arm switch tube to achieve soft switching, clamping switch itself can achieve soft switching. Based on modal analysis, the paper analyzes in detail the working principle of the converter and the realization of soft-switching conditions. The traditional PFC converter commonly used analog control scheme, simulation control, however, there are obvious defects; With the rise of the digital control chip cost-effective and PFC control algorithm development, the introduction of digital control in power factor correction technology has become an inevitable development trend. Digital average current mode PFC control strategy is transplanted from the simulation of the average current mode control strategy based on the advantages of both the average current-mode digital control aspects of the design of digital sinusoidal current given the input voltage feedforward The full digital control advantages. The paper gives a system block diagram of the digital PFC algorithm design voltage loop and current loop PI regulator, the simulation analysis using Pspice software, and hardware circuit platform; experimental results show that the algorithm a converter to obtain a good power factor correction effect. Average current-mode digital PFC algorithm structure is complex, large amount of computation, failed to take full advantage of the features and advantages of the digital control, thus the thesis novel control algorithm for a duty cycle forecast, the algorithm is a small amount, the Executive short time. Constraint relationship between voltage, current, and duty cycle of the converter, the paper gives the theoretical derivation of the algorithm, design of algorithms implemented in software process simulation analysis using Matlab software algorithm, the last in the hardware circuit platform on experimental verification; results show that the algorithm has better control than the average current-mode PFC algorithm performance, power factor correction converter ideal.

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