共查询到20条相似文献，搜索用时 15 毫秒
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Herbert H. C. Iu Yufei Zhou Chi K. Tse 《International Journal of Circuit Theory and Applications》2003,31(6):611-624
This paper investigates the fast‐scale instability in a power‐factor‐correction (PFC) boost converter under a conventional average current‐mode control. The converter is operated in continuous mode. Computer simulations and theoretical analysis are performed to study the effects of the time‐varying input voltage under the variation of some chosen parameters on the qualitative behaviour of the system. It is found that fast‐scale instability may occur during a line cycle, which can cause distortion to the line current and degrade the practical power factor. The results provide useful information for the design of PFC boost converters to avoid distortion due to fast‐scale bifurcation. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
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单级功率因数校正变换器中的低频不稳定现象研究 总被引：1，自引：1，他引：0
研究了由Boost 变换器和Forward变换器级联构成的单级功率因数校正(power factor correction,PFC)变换器中的低频不稳定现象。通过数值仿真观察了系统随着输出功率增大时出现的低频振荡现象及其对输入电流总谐波畸变的影响。根据Forward变换器电感电流导电模式的临界条件得到了相应的稳定性边界,并对低频不稳定现象的边界碰撞分岔本质进行分析和讨论。通过实验研究,验证仿真结果。该文的研究有助于更好地理解单级PFC变换中的动力学行为,对该系统参数设计也具有一定的参考价值。 相似文献
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Xiaoqun Wu Chi K. Tse Siu Chung Wong Junan Lu 《International Journal of Circuit Theory and Applications》2006,34(3):341-355
This paper describes the fast‐scale bifurcation phenomena of a single‐stage single‐switch power‐factor‐correction (PFC) regulator comprising a boost stage operating in discontinuous conduction mode (DCM) and a forward stage operating in continuous conduction mode (CCM). The two stages combine into a single stage by sharing one main switch and one control loop. Using ‘exact’ cycle‐by‐cycle computer simulations, the effects of various circuit parameters on fast‐scale instabilities are studied. The results are qualitatively verified by experimental measurements. This work provides a clear picture of how the variation of certain practical parameters can render such a circuit fast‐scale unstable. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
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M. B. D'Amico F. Angulo G. Olivar E. E. Paolini J. L. Moiola 《International Journal of Circuit Theory and Applications》2012,40(1):77-91
The first period‐doubling bifurcation of a dc–dc buck converter controlled by a zero‐average dynamic strategy is studied in detail. Owing to the saturation of the duty cycle, this bifurcation is followed by a border‐collision bifurcation, which is the main mechanism to introduce instability and chaos in the circuit. The multiparameter analysis presented here leads to a complete knowledge of the relatioship between these two bifurcations. The results are obtained by using a frequency‐domain approach for the study of period‐two oscillations in maps. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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The operation parameter of the buck–boost converter is examined for its boundary of the first flip bifurcation. It is found that the parameters exhibit a linear relation for the same parameter at another bifurcation point. The bifurcation parameters also have a linear correlation between them. Theoretical analysis is presented to explain how this can occur. Simulation and experimental results at 20 kHz are used to present these novel results. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
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应用TOPSwitch器件设计功率因数校正电源 总被引：3，自引：0，他引：3
讨论了在Boost功率变换电路中进行功率因数校正的方法,并介绍了如何使用TOPSwitch器件来设计低成本的功率因数校正电源。 相似文献
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In recent years, a wide variety of high‐power‐factor converter schemes have been proposed to solve the harmonic problem. The schemes are based on conventional boost, buck, or buck–boost topology, and their performance, such as output voltage control range in the boost and buck topology or efficiency in the buck–boost topology, is limited. To solve this, the authors propose a single‐phase high‐power‐factor converter with a new topology obtained from a combination of buck and buck–boost topology. The power stage performs the buck and buck–boost operations by a compact single‐stage converter circuit while the simple controller/modulator appropriately controls the alternation of the buck and buck–boost operation and maintains a high‐quality input current during both the buck and buck–boost operations. The proposed scheme results in a high‐performance rectifier with no limitation of output voltage control range and a high efficiency. In this paper, the principle and operation of the proposed converter scheme are described in detail and the theory is confirmed through experimental results obtained from 2‐kW prototype converter. © 2000 Scripta Technica, Electr Eng Jpn, 131(3): 91–100, 2000 相似文献
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论述了单周期控制技术的基本原理,应用单周期控制芯片IR1150制作了一台原理样机,并进行了实验论证。实验结果证明,单周期控制BoostPFC变换器具有功率因数高、效率高、结构简单、工作稳定等优点。 相似文献
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Pham Phu Hieu Yao‐Ching Hsieh Jing‐Yuan Lin Bing‐Siang Huang Huang‐Jen Chiu 《International Journal of Circuit Theory and Applications》2018,46(4):868-881
An active‐clamp zero‐voltage‐switching (ZVS) buck‐boost converter is proposed in this paper to improve the performance of converter in light load condition. By employing a small resonant inductor, the ZVS range of switches could be adjusted to very light load condition. Moreover, 2 clamping capacitors are added in the converter to eliminate the voltage spike on the switches during transition. The operating principle of the proposed converter is analyzed, and the optimal design guide for full range ZVS is also provided. A 60‐W output prototype is experimentally built and tested in laboratory to verify the feasibility of proposed converter. The measured results show the critical ZVS operation of power switches at 1 and 0.7‐W output power for buck and boost mode, respectively. The peak conversion efficiency is up to 92.3%. 相似文献
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Alencar Franco de Souza Enio Roberto Ribeiro Eduardo Moreira Vicente Fernando Lessa Tofoli 《International Journal of Circuit Theory and Applications》2019,47(9):1529-1553
The increasing need to improve power quality with the reduction of the harmonic content of current and voltage waveforms has been intensively analyzed in several studies, thus motivating the proposal of many high power factor rectifiers based on the classic converters such as boost and buck-boost. Moreover, distinct control techniques have also been proposed due to the commercial availability of integrated circuits (ICs) dedicated to impose sinusoidal input currents in switch-mode power supplies (SMPSs). The boost converter operating in continuous conduction mode (CCM) is by far the most traditional choice for this purpose due to circuit simplicity and low electromagnetic interference (EMI) levels. Within this context, this work analyzes some of the most important control techniques used in power factor correction (PFC). The performance of a single-phase boost converter using peak current mode control (PCMC), average current mode control (ACMC), and one cycle control (OCC) is evaluated experimentally in detail. A comprehensive analysis of key aspects such as the input current waveform and respective harmonic content, dc output voltage, and dynamic response of the converter is also presented. 相似文献
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《International Journal of Circuit Theory and Applications》2017,45(10):1382-1396
Power converter circuits, such as current‐controlled or voltage‐controlled converters and inverters often have multiple inputs in the controller. The multiple inputs cause high‐frequency and low‐frequency oscillations. In earlier studies, the characteristics of circuits in fast‐scale and slow‐scale dynamics have been investigated. However, in many cases, circuits with multiple inputs have three or more dimensional topology which makes detailed analysis difficult. In this paper, we analyze a simple interrupted electric circuit in order to understand essential characteristics of fast‐scale and slow‐scale dynamics. The advantage of this simple interrupted circuit is that it is possible to derive a 1‐dimensional map, which facilitates rigorous studies. Based on the structure of the return map and the characteristic multiplier, we explain the characteristics of the system. We report the occurrence of pitchfork, period doubling, and border collision bifurcations in slow scale, and period doubling bifurcation in fast scale. We found that local bifurcation, which appears in fast‐scale dynamics, does not significantly affect the global behavior of the system while instabilities in the slow‐scale dynamics strongly affect the system behavior. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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Liangyu Huang Yimin Lu 《IEEJ Transactions on Electrical and Electronic Engineering》2020,15(7):1040-1047
Nonlinear dynamic behaviors such as the bifurcation and chaos of DC‐DC converters with switching constant power load are studied in this paper. Based on the consideration of constant power load switching, a discrete iterative mapping model of the system including the switching process is established, and its Lyapunov exponent spectrum algorithm is derived. The main procedure of the algorithm is as follows: Firstly, the system is divided into six smooth segments, and the zero‐time discontinuous mapping of the load and mode switching is introduced. Secondly, the local mapping of each smooth segment and the zero‐time discontinuous mapping of the switching phase are used to construct the composite Poincaré mapping of the system by the chain rule, and then the discrete iterative mapping model of the system is established. Finally, the Lyapunov exponent spectrum algorithm of the system is derived based on the model to determine the type of nonlinear dynamic behavior of the system. This algorithm overcomes the problems of the existing methods, which lead to inaccurate results due to the neglect of the switching process, and achieves the purpose of accurately describing the dynamic characteristics of power electronic circuits. The simulation and experimental results have verified the validity of the proposed model and algorithm. © 2020 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
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为了提高功率因数校正(Power Factor Correction,PFC)变换器对负载变化的动态响应性能,同时消除输出电压二倍工频纹波,本文将二次型Boost变换器应用于PFC变换器中,并分析了其工作原理。根据主电路电感的工作模式,可以将二次型Boost PFC变换器的工作区域划分为四个区域:CCM-CCM、CCM-DCM、DCM-CCM和DCM-DCM,本论文重点研究了二次型DCM-DCM Boost PFC变换器的输出电压纹波特性及其动态性能。研究结果表明,与传统DCM Boost PFC变换器相比,二次型DCM-DCM Boost PFC变换器可消除输出电压的二倍工频纹波,降低输入电感电流峰值,且提高了负载动态响应速度,极大地降低了输出电压超调量与跌落量。最后,通过实验结果验证了理论分析的正确性。 相似文献
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相较于传统的Boost PFC变换器,无桥Boost PFC变换器省略了开关管前的整流桥,大大提高了变换器的效率。首先主要讨论电流断续模式下无桥Boost PFC的工作原理,推导理想状态下其PF的表达式和电感的计算,探讨实际工作中电路寄生参数对电感电流畸变的影响。然后针对DCM Boost PFC仅适用于中小功率场合这一缺点,引入了交错并联技术,提升了电路的功率量级。最后分别完成了单路500 W和两路交错1 kW的变换器样机实验,实验结果验证了理论分析的正确性。 相似文献
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