The Experts below are selected from a list of 20391 Experts worldwide ranked by ideXlab platform

Lifang Wang - One of the best experts on this subject based on the ideXlab platform.

  • design of wireless power transfer system for autonomous underwater vehicles considering seawater eddy current loss
    Microsystem Technologies-micro-and Nanosystems-information Storage and Processing Systems, 2021
    Co-Authors: Zhimeng Liu, Chengxuan Tao, Lifang Wang
    Abstract:

    This paper presents a multi-objective design method of underwater wireless power transfer (UWPT) system for autonomous underwater vehicles (AUV) based on the cooperative design of Compensation Network and a DC/DC converter, considering seawater eddy current loss. Firstly, the electromagnetic field model of the underwater coil is established based on the non-axisymmetric model, and the analysis method of eddy current loss is given. Then, according to the circuit model with seawater eddy current loss, a two-port Network including a Compensation Network and coil coupling model, is established. The cooperative design method of Compensation Network and DC/DC converter is presented to improve the efficiency of the UWPT system and reduce the electrical stress of the inverter, considering seawater eddy current loss. Finally, a 1 kW AUV UWPT system prototype is built. The experimental results prove that the proposed seawater eddy current loss analysis method is effective. The experimental results also show that the proposed Compensation Network and DC / DC converter duty cycle design method can achieve the purpose of constant voltage output, optimization of system efficiency, reduction of inverter electrical stress and inverter zero-voltage-switch.

  • Power Stabilization With Double Transmitting Coils and T-Type Compensation Network for Dynamic Wireless Charging of EV
    IEEE Journal of Emerging and Selected Topics in Power Electronics, 2020
    Co-Authors: Lifang Wang, Yanjie Guo, Chengxuan Tao
    Abstract:

    Power fluctuation caused by the movement of the receiver has always been a difficult problem for the development of dynamic wireless charging of electric vehicles (EVs). A segmented dynamic wireless charging system (DWCS) based on double transmitting coils and T-type Compensation Network is presented in this paper to restrain the power fluctuation. Cross-coupling effects are removed by adding switches in series with the transmitting coils. A genetic algorithm based multiobject optimization for the power fluctuation factor (PFF) and the reactive component is used to design the parameters of the T-type Network. Simulations show that the optimization of the T-type Network is not limited to a certain structure of the transmitter and receiver coils but can minimize the PFF for different values of the gap between the transmitting coils. Experiments for separated and overlapped transmitting coils show that the proposed double-transmitting-coil power supply scheme T-type Network can maintain the power fluctuation less than 6% of the average output power with the dc–dc efficiency above 85%.

  • Analysis of the input impedance of the rectifier and design of LCC Compensation Network of the dynamic wireless power transfer system
    IET Power Electronics, 2019
    Co-Authors: Yanjie Guo, Chengxuan Tao, Lifang Wang
    Abstract:

    A design method of line commutated converter (LCC) Compensation Network for the dynamic wireless power transfer (DWPT) system based on a complex impedance model (Z-model) of the input impedance of the rectifier is proposed in this study. The continuous conduction mode and discontinuous conduction mode (DCM) of the rectifier are analysed to calculate the equivalent input impedance of the rectifier. Based on the proposed model of the input impedance of the rectifier, a design method of LCC Compensation Network for the DWPT system is presented. Simulation results prove that the Z-model of the rectifier is more accurate than the prevailing resistive model. Experiments show that the DWPT system with the designed LCC Network meets the requirement of the average output power with an average DC–DC efficiency over 93%.

  • Designing of the transmitting coils and Compensation Network of a segmented DWPT system
    2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference (COBEP SPEC), 2019
    Co-Authors: Lifang Wang, Chengxuan Tao, Wang Liye
    Abstract:

    A multi-objective designing method of the dynamic wireless power transfer(DWPT) system considering both the coupling coils and Compensation Networks is proposed in this paper. The operating process of the DWPT system is analyzed based on LCC Compensation Network. The power transfer performance, electrical stress, ZVS condition and cost of the DWPT system are analyzed as the objectives or constraints of the optimization. Finally, a 4-coil segmented prototype is built to verify the proposed method.

  • Design of the Primary Side LCC Compensation Network Based on ZVS for Wireless Power Transfer Systems
    2019 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW), 2019
    Co-Authors: Yuwang Zhang, Yanjie Guo, Lifang Wang
    Abstract:

    When a wireless power transfer system (WPTS) needs to be controlled to regulate the output current or voltage, phase-shifting control is a good choice. So, the operation of zero-voltage switching (ZVS) of the system inverter needs to be considered in the process of phase-shifting. We present a parameter design method of the primary LCC Compensation Network to realize ZVS of the full-bridge inverter for the WPTS in the process of phase-shifting without other auxiliary circuits. In this paper, the condition realizing ZVS of lagging-leg switches is derived and analyzed, and the analytical results are verified by 1kW wireless power transfer prototype.

Yanjie Guo - One of the best experts on this subject based on the ideXlab platform.

  • Power Stabilization With Double Transmitting Coils and T-Type Compensation Network for Dynamic Wireless Charging of EV
    IEEE Journal of Emerging and Selected Topics in Power Electronics, 2020
    Co-Authors: Lifang Wang, Yanjie Guo, Chengxuan Tao
    Abstract:

    Power fluctuation caused by the movement of the receiver has always been a difficult problem for the development of dynamic wireless charging of electric vehicles (EVs). A segmented dynamic wireless charging system (DWCS) based on double transmitting coils and T-type Compensation Network is presented in this paper to restrain the power fluctuation. Cross-coupling effects are removed by adding switches in series with the transmitting coils. A genetic algorithm based multiobject optimization for the power fluctuation factor (PFF) and the reactive component is used to design the parameters of the T-type Network. Simulations show that the optimization of the T-type Network is not limited to a certain structure of the transmitter and receiver coils but can minimize the PFF for different values of the gap between the transmitting coils. Experiments for separated and overlapped transmitting coils show that the proposed double-transmitting-coil power supply scheme T-type Network can maintain the power fluctuation less than 6% of the average output power with the dc–dc efficiency above 85%.

  • Analysis of the input impedance of the rectifier and design of LCC Compensation Network of the dynamic wireless power transfer system
    IET Power Electronics, 2019
    Co-Authors: Yanjie Guo, Chengxuan Tao, Lifang Wang
    Abstract:

    A design method of line commutated converter (LCC) Compensation Network for the dynamic wireless power transfer (DWPT) system based on a complex impedance model (Z-model) of the input impedance of the rectifier is proposed in this study. The continuous conduction mode and discontinuous conduction mode (DCM) of the rectifier are analysed to calculate the equivalent input impedance of the rectifier. Based on the proposed model of the input impedance of the rectifier, a design method of LCC Compensation Network for the DWPT system is presented. Simulation results prove that the Z-model of the rectifier is more accurate than the prevailing resistive model. Experiments show that the DWPT system with the designed LCC Network meets the requirement of the average output power with an average DC–DC efficiency over 93%.

  • Design of the Primary Side LCC Compensation Network Based on ZVS for Wireless Power Transfer Systems
    2019 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW), 2019
    Co-Authors: Yuwang Zhang, Yanjie Guo, Lifang Wang
    Abstract:

    When a wireless power transfer system (WPTS) needs to be controlled to regulate the output current or voltage, phase-shifting control is a good choice. So, the operation of zero-voltage switching (ZVS) of the system inverter needs to be considered in the process of phase-shifting. We present a parameter design method of the primary LCC Compensation Network to realize ZVS of the full-bridge inverter for the WPTS in the process of phase-shifting without other auxiliary circuits. In this paper, the condition realizing ZVS of lagging-leg switches is derived and analyzed, and the analytical results are verified by 1kW wireless power transfer prototype.

  • Interoperability Analysis of Compensation Network in Electric Vehicle Wireless Charging System
    2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC), 2018
    Co-Authors: Yanjie Guo, Yuwang Zhang, Bingrong Yan, Ke Wang, Zhenjun Zhang, Lifang Wang
    Abstract:

    This paper presents a Compensation Network interoperability analysis for electric vehicle (EV) wireless charging system (WCS), as well as a Compensation Network interoperability evaluation method. Firstly, reflected impedances of WCS secondary sides are calculated, according to two typical Compensation Networks: series capacitor (SC) Compensation and inductor-capacitor-capacitor (LCC) Compensation. Then, an interoperability evaluation method is proposed, considering that system performance does not change much. Finally, an EV wireless charging prototype is developed, and experiments and simulations are conducted to verify the analysis and the proposed method. The results show that SC and LCC Compensation Networks have good interoperability on conditions that equivalent load resistance Re is close to optimal coil load resistance Ropt.

  • applying lcc Compensation Network to dynamic wireless ev charging system
    IEEE Transactions on Industrial Electronics, 2016
    Co-Authors: Qingwei Zhu, Lifang Wang, Yanjie Guo, Chenglin Liao
    Abstract:

    Based on the wireless power transfer (WPT) technology, dynamic wireless charging of electric vehicle (EV) is gaining increasing attentions because it promotes the popularization of EV and also serves a new form of clean transportation. In this paper, we introduce the LCC Compensation Network to WPT system oriented for dynamic wireless EV charging application. First, characteristics of symmetrical T-type Network, which is the origin of the favorable LCC Compensation Network, are summarized. Then, parametric design for both the LCC Network used in the secondary side and the LCC Network used in the primary side is elaborated theoretically. Furthermore, neighboring effects resulting from the combination of the LCC Compensation Network and the inevitable inter-coupling between adjacent segments are investigated. Finally, a two-segment LCC compensated dynamic EV charging system is built up and tested with both intra-segment and inter-segment experiments. Spatially averaged output power and dc–dc efficiency of the prototype are measured to be 2.34 kW and 91.3%, respectively. High consistency of the experimental results validates the correctness of the proposed analyses and parametric design method, as well as the suitability of applying LCC Network in dynamic wireless EV charging applications.

Chengxuan Tao - One of the best experts on this subject based on the ideXlab platform.

  • design of wireless power transfer system for autonomous underwater vehicles considering seawater eddy current loss
    Microsystem Technologies-micro-and Nanosystems-information Storage and Processing Systems, 2021
    Co-Authors: Zhimeng Liu, Chengxuan Tao, Lifang Wang
    Abstract:

    This paper presents a multi-objective design method of underwater wireless power transfer (UWPT) system for autonomous underwater vehicles (AUV) based on the cooperative design of Compensation Network and a DC/DC converter, considering seawater eddy current loss. Firstly, the electromagnetic field model of the underwater coil is established based on the non-axisymmetric model, and the analysis method of eddy current loss is given. Then, according to the circuit model with seawater eddy current loss, a two-port Network including a Compensation Network and coil coupling model, is established. The cooperative design method of Compensation Network and DC/DC converter is presented to improve the efficiency of the UWPT system and reduce the electrical stress of the inverter, considering seawater eddy current loss. Finally, a 1 kW AUV UWPT system prototype is built. The experimental results prove that the proposed seawater eddy current loss analysis method is effective. The experimental results also show that the proposed Compensation Network and DC / DC converter duty cycle design method can achieve the purpose of constant voltage output, optimization of system efficiency, reduction of inverter electrical stress and inverter zero-voltage-switch.

  • Power Stabilization With Double Transmitting Coils and T-Type Compensation Network for Dynamic Wireless Charging of EV
    IEEE Journal of Emerging and Selected Topics in Power Electronics, 2020
    Co-Authors: Lifang Wang, Yanjie Guo, Chengxuan Tao
    Abstract:

    Power fluctuation caused by the movement of the receiver has always been a difficult problem for the development of dynamic wireless charging of electric vehicles (EVs). A segmented dynamic wireless charging system (DWCS) based on double transmitting coils and T-type Compensation Network is presented in this paper to restrain the power fluctuation. Cross-coupling effects are removed by adding switches in series with the transmitting coils. A genetic algorithm based multiobject optimization for the power fluctuation factor (PFF) and the reactive component is used to design the parameters of the T-type Network. Simulations show that the optimization of the T-type Network is not limited to a certain structure of the transmitter and receiver coils but can minimize the PFF for different values of the gap between the transmitting coils. Experiments for separated and overlapped transmitting coils show that the proposed double-transmitting-coil power supply scheme T-type Network can maintain the power fluctuation less than 6% of the average output power with the dc–dc efficiency above 85%.

  • Analysis of the input impedance of the rectifier and design of LCC Compensation Network of the dynamic wireless power transfer system
    IET Power Electronics, 2019
    Co-Authors: Yanjie Guo, Chengxuan Tao, Lifang Wang
    Abstract:

    A design method of line commutated converter (LCC) Compensation Network for the dynamic wireless power transfer (DWPT) system based on a complex impedance model (Z-model) of the input impedance of the rectifier is proposed in this study. The continuous conduction mode and discontinuous conduction mode (DCM) of the rectifier are analysed to calculate the equivalent input impedance of the rectifier. Based on the proposed model of the input impedance of the rectifier, a design method of LCC Compensation Network for the DWPT system is presented. Simulation results prove that the Z-model of the rectifier is more accurate than the prevailing resistive model. Experiments show that the DWPT system with the designed LCC Network meets the requirement of the average output power with an average DC–DC efficiency over 93%.

  • Designing of the transmitting coils and Compensation Network of a segmented DWPT system
    2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference (COBEP SPEC), 2019
    Co-Authors: Lifang Wang, Chengxuan Tao, Wang Liye
    Abstract:

    A multi-objective designing method of the dynamic wireless power transfer(DWPT) system considering both the coupling coils and Compensation Networks is proposed in this paper. The operating process of the DWPT system is analyzed based on LCC Compensation Network. The power transfer performance, electrical stress, ZVS condition and cost of the DWPT system are analyzed as the objectives or constraints of the optimization. Finally, a 4-coil segmented prototype is built to verify the proposed method.

Trong Duy Nguyen - One of the best experts on this subject based on the ideXlab platform.

  • a double sided lcc Compensation Network and its tuning method for wireless power transfer
    IEEE Transactions on Vehicular Technology, 2015
    Co-Authors: Junjun Deng, Trong Duy Nguyen
    Abstract:

    This paper proposes a double-sided LCC Compensation Network and its tuning method for wireless power transfer (WPT). With the proposed topology and its tuning method, the resonant frequency is irrelevant with the coupling coefficient between the two coils and is also independent of the load condition, which means that the system can work at a constant switching frequency. Analysis in frequency domain is given to show the characteristics of the proposed method. We also propose a method to tune the Network to realize zero voltage switching (ZVS) for the Primary-side switches. Simulation and experimental results verified analysis and validity of the proposed Compensation Network and the tuning method. A wireless charging system with output power of up to 7.7 kW for electric vehicles was built, and 96% efficiency from dc power source to battery load is achieved.

Junjun Deng - One of the best experts on this subject based on the ideXlab platform.

  • a double sided lcc Compensation Network and its tuning method for wireless power transfer
    IEEE Transactions on Vehicular Technology, 2015
    Co-Authors: Junjun Deng, Trong Duy Nguyen
    Abstract:

    This paper proposes a double-sided LCC Compensation Network and its tuning method for wireless power transfer (WPT). With the proposed topology and its tuning method, the resonant frequency is irrelevant with the coupling coefficient between the two coils and is also independent of the load condition, which means that the system can work at a constant switching frequency. Analysis in frequency domain is given to show the characteristics of the proposed method. We also propose a method to tune the Network to realize zero voltage switching (ZVS) for the Primary-side switches. Simulation and experimental results verified analysis and validity of the proposed Compensation Network and the tuning method. A wireless charging system with output power of up to 7.7 kW for electric vehicles was built, and 96% efficiency from dc power source to battery load is achieved.