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In order to improve volumetric power density or gravimetric power density and reduce passive component losses of the power-receiver in inductive power transfer (IPT) system, a LCCN (inductor-capacitor-capacitor-none) compensated IPT system is proposed in this paper. The secondary compensation topology is eliminated to construct a compact and light-weight power-receiver. And a design method for the open-loop IPT system to achieve not only load-independent constant current (CC) output or constant voltage (CV) output transfer characteristics but also load-independent zero phase angle (ZPA) operating conditions is investigated. With the proposed method, the VA ratings of inverter is reduced and DC-DC converter for CV output is discarded to reduce system cost and power losses. At last, a compact LCCN compensated IPT system for automated guided vehicle (AGV) was designed and system parameters according to configuration requirements was calculated. A 1.0 kW MATLAB simulation platform and experimental prototype have been implemented to demonstrate the feasibility and validity of the theoretical analysis. The efficiency of the system can reach 92.046% at CC mode and 93.675% at constant voltage CV mode.
Di Zhang; Guorong Zhu; Jianghua Lu; Kai Du; Jing V. Wang. Characteristics Research on Compact and Light-Weight IPT System Based on LCCN Compensation. International Conference on Communication, Computing and Electronics Systems 2021, 109 -121.
AMA StyleDi Zhang, Guorong Zhu, Jianghua Lu, Kai Du, Jing V. Wang. Characteristics Research on Compact and Light-Weight IPT System Based on LCCN Compensation. International Conference on Communication, Computing and Electronics Systems. 2021; ():109-121.
Chicago/Turabian StyleDi Zhang; Guorong Zhu; Jianghua Lu; Kai Du; Jing V. Wang. 2021. "Characteristics Research on Compact and Light-Weight IPT System Based on LCCN Compensation." International Conference on Communication, Computing and Electronics Systems , no. : 109-121.
The successful commercialization of wireless power transfer (WPT) technology in mobile phones, laptops, and electric vehicles (EV), requires a safe, reliable, and efficient charging infrastructure. A metal object, such as a coin, a key, or a nail, however, may be inadvertently exposed, by close proximity, to the magnetic fields generated by the WPT coupler, creating a potential safety hazard and affecting the electrical characteristics of the WPT system. In addition, the magnetic fields may produce adverse symptoms, such as dizziness and breathlessness, in living objects near the charging systems. This paper provides a current state of the art review of all available designs for detecting metal and living objects in WPT systems. Working principles and qualitative comparisons in terms of sensitivity, accuracy, and cost of major detection methods are presented to reveal their inherent limitations and available applications. Finally, a number of research topics on foreign object detection (FOD) are suggested to encourage more researchers to make contributions to the development and commercial application of wireless charging systems.
Jianghua Lu; Guorong Zhu; Chunting Chris Mi. Foreign object detection in wireless power transfer systems. IEEE Transactions on Industry Applications 2021, PP, 1 -1.
AMA StyleJianghua Lu, Guorong Zhu, Chunting Chris Mi. Foreign object detection in wireless power transfer systems. IEEE Transactions on Industry Applications. 2021; PP (99):1-1.
Chicago/Turabian StyleJianghua Lu; Guorong Zhu; Chunting Chris Mi. 2021. "Foreign object detection in wireless power transfer systems." IEEE Transactions on Industry Applications PP, no. 99: 1-1.
Wireless power transfer (WPT) techniques have gained wide acceptance across a range of battery charging applications such as cell phones, cardiac pacemakers, and electric vehicles. In a wireless battery charging system, a constant current/constant voltage (CC/CV) charging strategy, regardless of the variation of the battery load which may roughly range from a few ohms to several hundred ohms, is typically adopted to ensure the safety, durability, and performance of the battery. However, system efficiency drops significantly as the load increases in CV mode, especially at very light-load conditions. This paper proposes an efficiency optimization method for an LCC-parallel compensated inductive power transfer (IPT) battery charging system without the help of any additional power converter and control method. The equivalent circuit and resonant conditions of the LCC-parallel compensation topology are firstly analyzed to achieve the load-independent CV output at a zero phase angle (ZPA) operating frequency. Over the full range of CV charging mode, the efficiency of the LCC-parallel resonant tank circuit is analyzed and optimized. An IPT battery charger prototype with 48 V charging voltage and 1 A charging current is implemented. A measured DC–DC transfer efficiency of greater than 90.48% is achieved during the whole CV charging profile.
Shuangcheng Yang; Xiangtian Deng; Jianghua Lu; Zhixuan Wu; Kai Du. Light-Load Efficiency Optimization for an LCC-Parallel Compensated Inductive Power Transfer Battery Charger. Electronics 2020, 9, 2080 .
AMA StyleShuangcheng Yang, Xiangtian Deng, Jianghua Lu, Zhixuan Wu, Kai Du. Light-Load Efficiency Optimization for an LCC-Parallel Compensated Inductive Power Transfer Battery Charger. Electronics. 2020; 9 (12):2080.
Chicago/Turabian StyleShuangcheng Yang; Xiangtian Deng; Jianghua Lu; Zhixuan Wu; Kai Du. 2020. "Light-Load Efficiency Optimization for an LCC-Parallel Compensated Inductive Power Transfer Battery Charger." Electronics 9, no. 12: 2080.
Non-radiative inductive power transfer is one of the most studied and commercially applied wireless charging technologies, where the magnetic field is employed as the medium for power transfer. In the wireless charging of electric vehicles, the strong magnetic field will heat up any metal items falling in the charging area due to eddy current induced in the metal objects, causing hazards like fire. Metal object detection (MOD) is necessary for the market penetration of inductive power transfer technology. This paper aims to improve the performance of systems that detect metal objects based on inductance variations. Two novel multi-layer detection coil layouts are proposed, which can not only cover the entire charging area without blind spots but can also be decoupled from the transmitter and receiver to minimize the influence of the magnetic field that is used for power transfer. Two mixed resonant circuits are proposed and proven to have better performance than parallel and series resonance. The impacts of the detection coil layer, trace width, and turn-number are investigated. The test results indicate that the MOD system can detect one-cent coins at various positions of the detection coil printed circuit board, and can also detect various inductance variations without blind spots in the processing circuit.
Bo Cheng; Jianghua Lu; Yiming Zhang; Guang Pan; Rakan Chabaan; Chunting Mi. A Metal Object Detection System with Multilayer Detection Coil Layouts for Electric Vehicle Wireless Charging. Energies 2020, 13, 2960 .
AMA StyleBo Cheng, Jianghua Lu, Yiming Zhang, Guang Pan, Rakan Chabaan, Chunting Mi. A Metal Object Detection System with Multilayer Detection Coil Layouts for Electric Vehicle Wireless Charging. Energies. 2020; 13 (11):2960.
Chicago/Turabian StyleBo Cheng; Jianghua Lu; Yiming Zhang; Guang Pan; Rakan Chabaan; Chunting Mi. 2020. "A Metal Object Detection System with Multilayer Detection Coil Layouts for Electric Vehicle Wireless Charging." Energies 13, no. 11: 2960.
This paper proposes an inductive power transfer (IPT) system with three-bridge switching compensation topology. With the proposed IPT topology, the equivalent circuit and the resonant condition are analyzed to achieve the load-independent constant current (CC) and load-independent constant voltage (CV) outputs. On this basis, multiple power levels can be achieved under CC/CV conditions by bridge arm switching, which makes it possible to complete charging tasks for multiple power level electric vehicles (EV) without switching the IPT system. A circuit simulation was built to verify the different power level switching effects of the structure. A 3.3 kW IPT system was designed to verify the proposed structure. At the rated output power, the experimental efficiency was up to 92.04% and 91.21% in CC and CV output modes, respectively.
Bingyang Luo; Yatao Shou; Jianghua Lu; Ming Li; Xiangtian Deng; Guorong Zhu; Luo; Shou; Lu; Li; Deng; Zhu. A Three-Bridge IPT System for Different Power Levels Conversion under CC/CV Transmission Mode. Electronics 2019, 8, 884 .
AMA StyleBingyang Luo, Yatao Shou, Jianghua Lu, Ming Li, Xiangtian Deng, Guorong Zhu, Luo, Shou, Lu, Li, Deng, Zhu. A Three-Bridge IPT System for Different Power Levels Conversion under CC/CV Transmission Mode. Electronics. 2019; 8 (8):884.
Chicago/Turabian StyleBingyang Luo; Yatao Shou; Jianghua Lu; Ming Li; Xiangtian Deng; Guorong Zhu; Luo; Shou; Lu; Li; Deng; Zhu. 2019. "A Three-Bridge IPT System for Different Power Levels Conversion under CC/CV Transmission Mode." Electronics 8, no. 8: 884.
The static VAR generator (SVG) is an important device in flexible AC transmission systems (FACTS) for the development of smart grids. Based on the basis principle of SVG and instantaneous reactive power theory, the conventional ip–iq and dq methods have a certain error when the three phase voltages are unbalanced. In this paper, the current detection algorithm is improved in cases of three-phase power asymmetry by using the fundamental positive-sequence reactive current instead of the voltage as the input of phase locked loop (PLL). So the problems caused by unbalanced three-phase voltages could be avoided. In addition, a moving average filter is designed to improve the performance of the detection accuracy and dynamic response. Experiments verify the correctness and effectiveness of the proposed scheme.
Xueliang Wei; Guorong Zhu; Jianghua Lu; Wenjing Li; And Erjie Qi; Erjie Qi. Improved Reactive Current Detection Method of SVG. Energies 2017, 10, 1374 .
AMA StyleXueliang Wei, Guorong Zhu, Jianghua Lu, Wenjing Li, And Erjie Qi, Erjie Qi. Improved Reactive Current Detection Method of SVG. Energies. 2017; 10 (9):1374.
Chicago/Turabian StyleXueliang Wei; Guorong Zhu; Jianghua Lu; Wenjing Li; And Erjie Qi; Erjie Qi. 2017. "Improved Reactive Current Detection Method of SVG." Energies 10, no. 9: 1374.