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The existing simultaneous wireless power and information transmission (SWPIT) technology used for wireless power transfer (WPT) systems is seriously plagued by the interference between the power and information transmission and the complex design of the information transmission and receiving circuits. To combat these problems, this paper proposes a novel SWPIT method, which does not need additional information transmitting or receiving coils. The stroboscopic mapping model of the WPT system is established first, and the soft-switching points of the DC-AC inverter are derived and compared for better utilizing deviation frequency enlargement effect (DFEE) to transfer power and information simultaneously. Subsequently, the information detection circuit is designed based on DFEE. The impacts caused by the detection circuit on the power and information transmission are analyzed in detail. Then the parameters of the detection circuit are optimized for minimizing the mutual interference between the power and information transmission. Finally, a 50 W experimental platform is established to verify the correctness and effectiveness of the proposed SWPIT strategy. The experimental results show that the information transmission rate can reach up to 16 kbps, the load voltage fluctuation can be controlled below 3%, and the efficiency of the whole system can be maintained at 90%.
Xu Liu; Chenyang Xia; Xiaozuo Han; Zhen Wu; Zhijuan Liao. Simultaneous Wireless Power and Information Transmission Based on Harmonic Characteristic of Soft-Switching Inverter. IEEE Transactions on Industrial Electronics 2021, PP, 1 -1.
AMA StyleXu Liu, Chenyang Xia, Xiaozuo Han, Zhen Wu, Zhijuan Liao. Simultaneous Wireless Power and Information Transmission Based on Harmonic Characteristic of Soft-Switching Inverter. IEEE Transactions on Industrial Electronics. 2021; PP (99):1-1.
Chicago/Turabian StyleXu Liu; Chenyang Xia; Xiaozuo Han; Zhen Wu; Zhijuan Liao. 2021. "Simultaneous Wireless Power and Information Transmission Based on Harmonic Characteristic of Soft-Switching Inverter." IEEE Transactions on Industrial Electronics PP, no. 99: 1-1.
N6-methyladenosine (m6A) has been shown to play crucial roles in RNA metabolism, physiology, and pathological processes. However, the specific regulatory mechanisms of most methylation sites remain uncharted due to the complexity of life processes. Biological experimental methods are costly to solve this problem, and computational methods are relatively lacking. The discovery of local co-methylation patterns (LCPs) of m6A epi-transcriptome data can benefit to solve the above problems. Based on this, we propose a novel biclustering algorithm based on the beta distribution (BDBB), which realizes the mining of LCPs of m6A epi-transcriptome data. BDBB employs the Gibbs sampling method to complete parameter estimation. In the process of modeling, LCPs are recognized as sharp beta distributions compared to the background distribution. Simulation study showed BDBB can extract all the three actual LCPs implanted in the background data and the overlap conditions between them with considerable accuracy (almost close to 100%). On MeRIP-Seq data of 69,446 methylation sites under 32 experimental conditions from 10 human cell lines, BDBB unveiled two LCPs, and Gene Ontology (GO) enrichment analysis showed that they were enriched in histone modification and embryo development, etc. important biological processes respectively. The GOE_Score scoring indicated that the biclustering results of BDBB in the m6A epi-transcriptome data are more biologically meaningful than the results of other biclustering algorithms.
Zhaoyang Liu; Yuteng Xiao; Yin Hongsheng; Xiaodan Li; Shutao Chen; Kaijian Xia; Lin Zhang. BDBB: A Novel Beta-distribution-based Biclustering Algorithm for Revealing Local Co-methylation Patterns in Epi-transcriptome Profiling Data. IEEE Journal of Biomedical and Health Informatics 2021, PP, 1 -1.
AMA StyleZhaoyang Liu, Yuteng Xiao, Yin Hongsheng, Xiaodan Li, Shutao Chen, Kaijian Xia, Lin Zhang. BDBB: A Novel Beta-distribution-based Biclustering Algorithm for Revealing Local Co-methylation Patterns in Epi-transcriptome Profiling Data. IEEE Journal of Biomedical and Health Informatics. 2021; PP (99):1-1.
Chicago/Turabian StyleZhaoyang Liu; Yuteng Xiao; Yin Hongsheng; Xiaodan Li; Shutao Chen; Kaijian Xia; Lin Zhang. 2021. "BDBB: A Novel Beta-distribution-based Biclustering Algorithm for Revealing Local Co-methylation Patterns in Epi-transcriptome Profiling Data." IEEE Journal of Biomedical and Health Informatics PP, no. 99: 1-1.
Recent studies have shown that in-depth studies on epi-transcriptomic patterns of N6-methyladenosine (m6A) may be helpful to understand its complex functions and co-regulatory mechanisms. Since most biclustering algorithms are developed in scenarios of gene expression analysis, which does not share the same characteristics with m6A methylation profile, we propose a weighted Plaid bi-clustering model (FBCwPlaid) based on Lagrange multiplier method to discover the potential functional patterns. The model seeks for one bi-cluster each time. Thus, the goal of each time turns into a binary classification problem. It initializes model parameters by k-means clustering, and then updates the parameters of the Plaid model. To address the issue that site expression level determines methylation level confidence, it uses RNA expression levels of each site as weights to make lower expressed sites less confident. FBCwPlaid also allows overlapping bi-clusters, indicating some sites may participate in multiple biological functions. FBCwPlaid was then applied on MeRIP-seq data of 69,446 methylation sites under 32 experimental conditions. Finally, 3 patterns were discovered, and further pathway analysis and enzyme specificity test showed that sites involved in each pattern are highly relevant to m6A methyltransferases. Further detailed analyses even showed that some patterns are condition relevant.
Shutao Chen; Lin Zhang; Lin Lu; Jia Meng; Hui Liu. FBCwPlaid: A Functional Bi-clustering Analysis of Epi-transcriptome Profiling Data via a Weighted Plaid Model. IEEE/ACM Transactions on Computational Biology and Bioinformatics 2021, PP, 1 -1.
AMA StyleShutao Chen, Lin Zhang, Lin Lu, Jia Meng, Hui Liu. FBCwPlaid: A Functional Bi-clustering Analysis of Epi-transcriptome Profiling Data via a Weighted Plaid Model. IEEE/ACM Transactions on Computational Biology and Bioinformatics. 2021; PP (99):1-1.
Chicago/Turabian StyleShutao Chen; Lin Zhang; Lin Lu; Jia Meng; Hui Liu. 2021. "FBCwPlaid: A Functional Bi-clustering Analysis of Epi-transcriptome Profiling Data via a Weighted Plaid Model." IEEE/ACM Transactions on Computational Biology and Bioinformatics PP, no. 99: 1-1.
The frequency splitting phenomenon (FSP) is a critical issue in wireless power transfer (WPT) systems. When the FSP exists, the load power will sharply increase and can be dozens of times of the power obtained at the resonant frequency if the driving frequency varies from the resonant frequency, which seriously affects the system safety. This paper studies the impacts caused by the FSP in detail and then proposes a system control method by utilizing the advantages of the FSP to realize constant power output and zero voltage switching (ZVS) of the DC-AC inverter simultaneously. The splitting frequencies are tracked and the driving frequency is precisely adjusted together with the DC-link voltage. The specific implementation method is given in this work to minimize the impacts on the power transfer performance. An 85 kHz, 3.3 kW WPT system is built up to validate the proposed method. The experimental results show that when the FSP occurs at 150 mm coil-to-coil distance and 5 Ω load resistance, the load power can be hold at 3.3 kW with the DC-link voltage reduced from 327 V to 160 V. Meanwhile, ZVS of the inverter is realized and the inverter efficiency is improved from 95% to 97%.
Xu Liu; Xibo Yuan; Chenyang Xia; Xiaojie Wu. Analysis and Utilization of the Frequency Splitting Phenomenon in Wireless Power Transfer Systems. IEEE Transactions on Power Electronics 2020, 36, 3840 -3851.
AMA StyleXu Liu, Xibo Yuan, Chenyang Xia, Xiaojie Wu. Analysis and Utilization of the Frequency Splitting Phenomenon in Wireless Power Transfer Systems. IEEE Transactions on Power Electronics. 2020; 36 (4):3840-3851.
Chicago/Turabian StyleXu Liu; Xibo Yuan; Chenyang Xia; Xiaojie Wu. 2020. "Analysis and Utilization of the Frequency Splitting Phenomenon in Wireless Power Transfer Systems." IEEE Transactions on Power Electronics 36, no. 4: 3840-3851.
This paper analyses the relationship between the coil design parameters and the system performance, including power transfer efficiency and amount, when circular flat spiral coils are adopted in a wireless power transfer (WPT) system. Coil design variables including outer radius, inner radius, channel width and coil turns are thoroughly studied to improve the system performance with a limited maximum outer radius for practical purposes. A two-coil WPT system has been built to verify the analysis, and the experimental results show good consistency with the theoretical calculations and simulation results, which show that the coil design parameters have a significant impact on the system performance, even with the same coil size. In the experiments, the coil-to-coil distance is 150 mm, the maximum coil outer radius is limited in 300 mm, and the DC input voltage and the load resistance are 100 V and 5 Ω, respectively. When the coils are tightly-wound in the most traditional way to maximize the coil size, the coil-system efficiency is 62.6% with only 4.5 W load power. In contrast, the efficiency optimized coil can improve the coil-system efficiency to 91.2% with the outer radius stayed the same. Besides, when the power transfer efficiency and amount are considered simultaneously, the system can achieve 1279 W load power with 85.94% coil-system efficiency.
Xu Liu; Chenyang Xia; Xibo Yuan. Study of the Circular Flat Spiral Coil Structure Effect on Wireless Power Transfer System Performance. Energies 2018, 11, 2875 .
AMA StyleXu Liu, Chenyang Xia, Xibo Yuan. Study of the Circular Flat Spiral Coil Structure Effect on Wireless Power Transfer System Performance. Energies. 2018; 11 (11):2875.
Chicago/Turabian StyleXu Liu; Chenyang Xia; Xibo Yuan. 2018. "Study of the Circular Flat Spiral Coil Structure Effect on Wireless Power Transfer System Performance." Energies 11, no. 11: 2875.
Increasing the resonant frequency of a wireless power transfer (WPT) system effectively improves the power transfer efficiency between the transmit and the receive coils but significantly limits the power transfer capacity with the same coils. Therefore, this paper proposes a coil design method for a series-series (SS) compensated WPT system which can power up the same load with the same DC input voltage & current but with increased resonant frequency. For WPT systems with higher resonant frequencies, a new method of realizing soft-switching by tuning driving frequency is proposed which does not need to change any hardware in the WPT system and can effectively reduce switching losses generated in the inverter. Eighty-five kHz, 200 kHz and 500 kHz WPT systems are built up to validate the proposed methods. Experimental results show that all these three WPT systems can deliver around 3.3 kW power to the same load (15 Ω) with 200 V input voltage and 20 A input current as expected and achieve more than 85% coil-system efficiency and 79% system overall efficiency. With the soft-switching technique, inverter efficiency can be improved from 81.91% to 98.60% in the 500 kHz WPT system.
Xu Liu; Jianhua Liu; Jianjing Wang; Chonglin Wang; Xibo Yuan. Design Method for the Coil-System and the Soft Switching Technology for High-Frequency and High-Efficiency Wireless Power Transfer Systems. Energies 2017, 11, 7 .
AMA StyleXu Liu, Jianhua Liu, Jianjing Wang, Chonglin Wang, Xibo Yuan. Design Method for the Coil-System and the Soft Switching Technology for High-Frequency and High-Efficiency Wireless Power Transfer Systems. Energies. 2017; 11 (1):7.
Chicago/Turabian StyleXu Liu; Jianhua Liu; Jianjing Wang; Chonglin Wang; Xibo Yuan. 2017. "Design Method for the Coil-System and the Soft Switching Technology for High-Frequency and High-Efficiency Wireless Power Transfer Systems." Energies 11, no. 1: 7.
A new design approach is presented in this paper to show that under certain conditions, in a two-coil wireless power transfer system, the double-sided inductor-capacitor-capacitor (LCC) compensated wireless power transfer (LCC-WPT) system can be more energy efficient than the series-series (SS) compensated wireless power transfer (SS-WPT) system for the same load power, with special attention being paid to the effect that the parasitic coil and capacitor resistances have on the system efficiency. To make a fair comparison between the SS and LCC WPT systems, the direct current (DC) link voltage was adjusted to set equal load power for the two systems whilst using identical transmit and receive coils, coil-to-coil distance and load resistance. The system performance in terms of the system efficiency, the voltage stresses on the components, and the losses in the power devices were analysed for a practical system, comparing the LCC-WPT system and the SS-WPT system with respect to the load resistance. The effect of coil misalignment on the transferred power and efficiency for the two systems was compared. The theoretical proof and the conditions for meeting the objective are derived and practically verified in a two-coil WPT practical prototype, showing good agreement between analysis and experiments.
Xu Liu; Lindsay Clare; Xibo Yuan; Chonglin Wang; Jianhua Liu. A Design Method for Making an LCC Compensation Two-Coil Wireless Power Transfer System More Energy Efficient Than an SS Counterpart. Energies 2017, 10, 1346 .
AMA StyleXu Liu, Lindsay Clare, Xibo Yuan, Chonglin Wang, Jianhua Liu. A Design Method for Making an LCC Compensation Two-Coil Wireless Power Transfer System More Energy Efficient Than an SS Counterpart. Energies. 2017; 10 (9):1346.
Chicago/Turabian StyleXu Liu; Lindsay Clare; Xibo Yuan; Chonglin Wang; Jianhua Liu. 2017. "A Design Method for Making an LCC Compensation Two-Coil Wireless Power Transfer System More Energy Efficient Than an SS Counterpart." Energies 10, no. 9: 1346.