scholarly journals Dual-Side Phase-Shift Control for Strongly Coupled Series–Series Compensated Electric Vehicle Wireless Charging Systems

2021 ◽  
Vol 13 (1) ◽  
pp. 6
Author(s):  
Yiming Zhang ◽  
Zhiwei Shen ◽  
Yuanchao Wu ◽  
Hui Wang ◽  
Wenbin Pan
Keyword(s):  
Phase Shift ◽  
Power Density ◽  
High Efficiency ◽  
Harmonic Approximation ◽  
Future Trend ◽  
Soft Switching ◽  
Power Transfer ◽  
Strongly Coupled ◽  
Loosely Coupled ◽  
Shift Control

Wireless power transfer (WPT) for electric vehicles is an emerging technology and a future trend. To increase power density, the coupling coefficient of coils can be designed to be large, forming a strongly coupled WPT system, different from the conventional loosely coupled WPT system. In this way, the power density and efficiency of the WPT system can be improved. This paper investigates the dual-side phase-shift control of the strongly coupled series–series compensated WPT systems. The mathematical models based on the conventional first harmonic approximation and differential equations for the dual-side phase-shift control are built and compared. The dual-side phase-shift angle and its impact on the power transfer direction and soft switching are investigated. It is found that synchronous rectification at strong couplings can lead to hard switching because the dual-side phase shift in this case is over 90°. In comparison, a relatively high efficiency and soft switching can be realized when the dual-side phase shift is below 90°. The experimental results have validated the analysis.

scholarly journals Multi-Objective Unified Optimal Control Strategy for DAB Converters with Triple-Phase-Shift Control

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6444
Author(s):  
Jinhui Zeng ◽  
Yao Rao ◽  
Zheng Lan ◽  
Dong He ◽  
Fan Xiao ◽  
...  
Keyword(s):  
Optimal Control ◽  
Phase Shift ◽  
Dynamic Response ◽  
Control Strategy ◽  
High Efficiency ◽  
Soft Switching ◽  
Optimal Control Strategy ◽  
Current Stress ◽  
Multi Objective ◽  
Shift Control

To solve the problems of large current stress, difficult soft-switching of all switches, and slow dynamic response of dual active bridge converters, a multi-objective unified optimal control strategy based on triple-phase-shift control was proposed. The forward power flow global modes of triple-phase-shift control were analyzed, and three high-efficiency modes were selected to establish the analytical models of current stress and soft-switching. Combined with these models, the optimal solutions in different modes were derived by using the cost function-optimization equation to overcome the limitation of the Lagrange multiplier method, such that the DAB converter achieved the minimum current stress, and all switches operated in the soft-switching state over the entire power range. At the same time, the virtual power component was introduced in the phase-shift ratio combination, which improved the dynamic response of output voltage under the input voltage or load steps changed by power control. The theoretical analysis and experimental results show that the proposed control strategy can optimize the performance of the DAB converter from three aspects, such as current stress, soft-switching, and dynamic response, which achieves multi-objective optimization of the steady-state and dynamic performance of DAB converters.

A Modular-Designed Three-Phase High-Efficiency High-Power-Density EV Battery Charger Using Dual/Triple-Phase-Shift Control

2018 ◽  
Vol 33 (9) ◽  
pp. 8091-8100 ◽  
Author(s):  
Juncheng Lu ◽  
Kevin Bai ◽  
Allan Ray Taylor ◽  
Guanliang Liu ◽  
Alan Brown ◽  
...  
Keyword(s):  
Phase Shift ◽  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
High Power Density ◽  
Battery Charger ◽  
Shift Control ◽  
Three Phase

scholarly journals ZVS Auxiliary Circuit for a 10 kW Unregulated LLC Full-Bridge Operating at Resonant Frequency for Aircraft Application

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1850 ◽  
Author(s):  
Yann E. Bouvier ◽  
Diego Serrano ◽  
Uroš Borović ◽  
Gonzalo Moreno ◽  
Miroslav Vasić ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Power Density ◽  
High Efficiency ◽  
Harmonic Approximation ◽  
Maximum Efficiency ◽  
Voltage Gain ◽  
Load Range ◽  
Transition Analysis ◽  
Aircraft Application ◽  
Auxiliary Circuit

In modern aircraft designs, following the More Electrical Aircraft (MEA) philosophy, there is a growing need for new high-power converters. In this context, innovative solutions to provide high efficiency and power density are required. This paper proposes an unregulated LLC full-bridge operating at resonant frequency to obtain a constant gain at all loads. The first harmonic approximation (FHA) model is not accurate enough to estimate the voltage gain in converters with high parasitic resistance. A modified FHA model is proposed for voltage gain analysis, and time-based models are used to calculate the instantaneous current required for the ZVS transition analysis. A method using charge instead of current is proposed and used for this ZVS analysis. Using this method, an auxiliary circuit is proposed to achieve complete ZVS within the whole load range, avoiding a gapped transformer design and increasing the efficiency and power density. A 28 Vdc output voltage prototype, with 10 kW peak output power, has been developed to validate the theoretical analysis and the proposed auxiliary circuit. The maximum efficiency (96.3%) is achieved at the nominal power of 5 kW.

A High Robustness and High Efficiency Single-Ended Wireless V2H System with a New Phase Shift Control.

2020 ◽  
Vol 46 (0) ◽  
pp. 59-67
Author(s):  
Junnosuke Nohara ◽  
Hideki Omori ◽  
Masahito Tsuno ◽  
Toshimitsu Morizane ◽  
Hidehito Matayoshi
Keyword(s):  
Phase Shift ◽  
High Efficiency ◽  
Shift Control ◽  
New Phase
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