The Experts below are selected from a list of 20244 Experts worldwide ranked by ideXlab platform
Ya Jun Yu - One of the best experts on this subject based on the ideXlab platform.
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Design of variable bandedge FIR filters with extremely large bandedge Variation Range
2011 IEEE International Symposium of Circuits and Systems (ISCAS), 2011Co-Authors: Ya Jun YuAbstract:The computational complexities of digital variable bandedge finite impulse response (FIR) filters heavily depend on the frequency response approximation precision and bandedge Variation Range, for given transition width and ripple requirements. In this paper, a non- uniform filter bank approach is proposed for the design of variable bandedge FIR filters with extremely large Variation Range, but low computational complexity, while the frequency response of the variable filters are precisely approximated, especially for the filter with sharp transition band.
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ISCAS - Design of variable bandedge FIR filters with extremely large bandedge Variation Range
2011 IEEE International Symposium of Circuits and Systems (ISCAS), 2011Co-Authors: Ya Jun YuAbstract:The computational complexities of digital variable bandedge finite impulse response (FIR) filters heavily depend on the frequency response approximation precision and bandedge Variation Range, for given transition width and ripple requirements. In this paper, a non-uniform filter bank approach is proposed for the design of variable bandedge FIR filters with extremely large Variation Range, but low computational complexity, while the frequency response of the variable filters are precisely approximated, especially for the filter with sharp transition band.
Zhen Zhang - One of the best experts on this subject based on the ideXlab platform.
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Optimal Switching Frequency Variation Range Control for CRM Boost PFC Converter
IEEE Transactions on Industrial Electronics, 1Co-Authors: Kaili Chen, Huanqi Tang, Lei Li, Chengjian Wu, Zhen ZhangAbstract:Critical conduction mode (CRM) boost power factor correction (PFC) converter is widely used in low-to-medium power applications for its advantages of high power factor (PF), zero-current turn-on of the switch and no reverse recovery in diode. Nevertheless, the switching frequency varies continually with the input voltage phase angle with traditional constant on-time (COT) control. This makes the electromagnetic interference (EMI) spectra appear great differences and complicates the design of EMI filter. An optimal switching frequency Variation Range (OFR) control strategy is proposed in this paper. The optimal harmonics amounts for the lowest switching frequency Variation Range without and with a limited PF are both figured out. In addition, a lower output voltage ripple and a higher efficiency is obtained. A prototype has been built and tested in the lab to demonstrate the validity of the theoretical analysis.
Junfang Zhang - One of the best experts on this subject based on the ideXlab platform.
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Reducing the switching frequency Variation Range for CRM buck PFC converter by variable on-time control
2016 IEEE Applied Power Electronics Conference and Exposition (APEC), 2016Co-Authors: Xiaoping Wang, Junfang ZhangAbstract:Critical conduction mode(CRM) Buck power factor correction(PFC) with peak current-controlled of currentmode control, its traditional control is constant on-time control, the switching frequency varies with the input voltage and load Variations, and a relatively large frequency Range, lead to a large of switching loss. This paper proposes a variable on-time control strategy for a CRM Buck PFC converter. By injecting a certain amount of third harmonic in the peak current reference signal, obtaining the optimization of the switching frequency Range, reduction of the switching loss and the ripple of output voltage. Analyzing the operating principle and performance of CRM Buck PFC converter with constant on-time and variable on-time control strategy respectively, further designing the control circuit. Simulation results show that the variable on-time control strategy can effectively reduce the switching frequency of the switch, improve the performance of CRM Buck PFC converter.
Yi Wang - One of the best experts on this subject based on the ideXlab platform.
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Reducing the Variation Range of the switching frequency for CRM boost PFC converter by injecting 3rd harmonic into the input current
2016 IEEE Applied Power Electronics Conference and Exposition (APEC), 2016Co-Authors: Yi WangAbstract:CRM Boost PFC converter features zero-current turn-on for the switch and no reverse recovery in diode. However, its switching frequency varies over a wide Range, which leads to the efficiency deterioration and the EMI filter design complexity. In this paper, a minimum switching frequency Variation Range control (MFVC) strategy is proposed by injecting the optimal 3rd harmonic into the input current. Compared to that with the traditional control (TC), the proposed MFVC strategy achieves a minimum Variation Range of the switching frequency, an output voltage ripple reduction and a higher efficiency. A 60W input prototype has been fabricated and tested in the laboratory. The experimental results are given to verify the effectiveness of the proposed method.
Alireza Bakhshai - One of the best experts on this subject based on the ideXlab platform.
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An Adaptive ZVS Full-Bridge DC–DC Converter With Reduced Conduction Losses and Frequency Variation Range
IEEE Transactions on Power Electronics, 2015Co-Authors: Alireza Safaee, Praveen K. Jain, Alireza BakhshaiAbstract:This paper presents a description and analysis of a full-bridge converter with a novel passive and robust auxiliary circuit for zero-voltage-switching (ZVS) operation. A generalized time-domain state-space analysis is provided to describe the steady-state behavior of the auxiliary circuit. Complete comparison between the well-known single-inductor auxiliary circuit, and the proposed one is presented. For a similar peak current in the auxiliary branch, needed for ZVS, a minimum of 20% reduction in rms current is achieved to decrease the conduction losses in the power switches and in the auxiliary circuit. Also, 65% reduction in switching frequency Variation is obtained. This narrower frequency Range reduces the need for very high-frequency operation and the associated gate driver losses as well as the difficulty of electromagnetic interference (EMI) filter design. All the theoretical results are experimentally verified.
