scholarly journals A Wireless Power Transfer Charger with Hybrid Compensation Topology for Constant Current/Voltage Onboard Charging

2021 ◽  
Vol 11 (16) ◽  
pp. 7569
Author(s):  
Guangyao Li ◽  
Dong-Hee Kim
Keyword(s):  
Wireless Power Transfer ◽  
Constant Current ◽  
Maximum Efficiency ◽  
Power Transfer ◽  
Wireless Power ◽  
Control Logic ◽  
Zero Voltage Switching ◽  
Hybrid Topology ◽  
Battery Chargers ◽  
Current Voltage

Compared with plugged-in chargers, wireless power transfer (WPT) systems for battery chargers have numerous advantages, e.g., safety, efficiency, and convenience. To satisfy the important wireless charging requirements of efficiency and safety of the battery, this paper proposes a constant current/voltage (CC/CV) charging compensation topology with near-communication based on receiving-side hybrid topology switching, which is unaffected by the dynamic loads. The proposed hybrid topology is systematically analyzed by using the M-mode, and the system parameters are designed to satisfy the constraints of zero phase angle (ZPA) and the specified CC output. In the CV mode, one shunt capacitor is employed to the compensation topology for the CV output and ZPA realization. Both the CC and CV modes are operated under the conditions of zero voltage switching (ZVS) for reducing the loss of the WPT systems. The proposed hybrid compensation topology is controlled by the receiving side and does not require real-time communication to avoid sophisticated control logic. Finally, a 1.1-kW experimental prototype charger based on DS-LCC and LCC-S topologies was established to verify the charging performance of the proposed WPT systems. The maximum efficiency of the proposed WPT charger was found to be approximately 91%. The experimental results were consistent with those of the theoretical analysis.

scholarly journals Reconfigurable Hybrid Resonant Topology for Constant Current/Voltage Wireless Power Transfer of Electric Vehicles

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1323
Author(s):  
Sang-Hoon Hwang ◽  
Yafei Chen ◽  
Hailong Zhang ◽  
Kang-Yoon Lee ◽  
Dong-Hee Kim
Keyword(s):  
Detailed Analysis ◽  
Electric Vehicles ◽  
Constant Current ◽  
Maximum Efficiency ◽  
Constant Voltage ◽  
Wireless Power ◽  
Stable Mode ◽  
Hybrid Topology ◽  
Current Voltage ◽  
Output Characteristics

This paper proposes a reconfigurable hybrid topology (RHT) for the constant current (CC)/constant voltage (CV) charging of electric vehicles. The proposed system combines the series–series and the inductor and double capacitors-series topologies. Two AC switches (ACSs) are utilized to change the CC and CV charging modes, without requiring an additional resonant network. A detailed analysis for designing the hybrid topology parameters is also presented; a three-kilowatt prototype was configured based on this analysis in order to validate the proposed system. The constructed prototype confirmed the stable mode changes, load fluctuations, CC/CV output characteristics and efficiency of the proposed system. The maximum efficiency of the proposed RHT was found to be 92.58%.

scholarly journals Maximizing Transfer Efficiency with an Adaptive Wireless Power Transfer System for Variable Load Applications

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1417
Author(s):  
Jung-Hoon Cho ◽  
Byoung-Hee Lee ◽  
Young-Joon Kim
Keyword(s):  
Loading Condition ◽  
Wireless Power Transfer ◽  
Input Voltage ◽  
Transfer Efficiency ◽  
Maximum Efficiency ◽  
Variable Load ◽  
Power Transfer ◽  
Wireless Power ◽  
Variable Loading ◽  
Power Transfer Efficiency

Electronic devices usually operate in a variable loading condition and the power transfer efficiency of the accompanying wireless power transfer (WPT) method should be optimizable to a variable load. In this paper, a reconfigurable WPT technique is introduced to maximize power transfer efficiency in a weakly coupled, variable load wireless power transfer application. A series-series two-coil wireless power network with resonators at a frequency of 150 kHz is presented and, under a variable loading condition, a shunt capacitor element is added to compensate for a maximum efficiency state. The series capacitance element of the secondary resonator is tuned to form a resonance at 150 kHz for maximum power transfer. All the capacitive elements for the secondary resonators are equipped with reconfigurability. Regardless of the load resistance, this proposed approach is able to achieve maximum efficiency with constant power delivery and the power present at the load is only dependent on the input voltage at a fixed operating frequency. A comprehensive circuit model, calculation and experiment is presented to show that optimized power transfer efficiency can be met. A 50 W WPT demonstration is established to verify the effectiveness of this proposed approach.

scholarly journals A Novel Single-switch Phase Controlled Wireless Power Transfer System

Electronics ◽  
2018 ◽  
Vol 7 (11) ◽  
pp. 281 ◽  
Author(s):  
Xin Liu ◽  
Nan Jin ◽  
Xijun Yang ◽  
Khurram Hashmi ◽  
Dianguan Ma ◽  
...  
Keyword(s):  
Wireless Power Transfer ◽  
Phase Control ◽  
Constant Current ◽  
Power Transfer ◽  
Wireless Power ◽  
Effective Implementation ◽  
Active Rectifier ◽  
Switching Patterns ◽  
Control Scheme ◽  
Wireless Power Transfer System

Battery charging is a fundamental application of Wireless Power Transfer (WPT) systems that requires effective implementation of Constant Current (CC) and Constant Voltage (CV) power conduction modes. DC-DC converters used in WPT systems utilize large inductors and capacitors that increase the size and volume of the system in addition to causing higher DC losses. This work proposes a novel single-switch active rectifier for phase controlled WPT systems that is smaller in volume and weight as compared to conventional WPT topologies. The proposed method simplifies the control scheme using improved Digital Phase Control (DPC) and Analog Phase Control (APC) to realize the CC and CV power transfer modes. Furthermore, it prevents forward voltage losses in Silicon Carbide (SiC) switches and shoot through states with improved switching patterns. Simulation studies and experimental results are added to verify the effectiveness of the proposed methodology.

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