scholarly journals Interleaved Buck Converter for Inductive Wireless Power Transfer in DC–DC Converters

Electronics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 949
Author(s):  
Marco Carbajal-Retana ◽  
Leobardo Hernandez-Gonzalez ◽  
Jazmin Ramirez-Hernandez ◽  
Juan Gerardo Avalos-Ochoa ◽  
Pedro Guevara-Lopez ◽  
...  
Keyword(s):  
Control Strategy ◽  
Output Voltage ◽  
High Efficiency ◽  
Wireless Power Transfer ◽  
Power Converter ◽  
Buck Converter ◽  
Power Transfer ◽  
Wireless Power ◽  
Operating Modes ◽  
Bridge Rectifier

The use of Inductive Wireless Power Transfer (IWPT) varies from low-power applications such as mobile phones and tablets chargers to high-power electric vehicles chargers. DC–DC converters are used in IWPT systems, and their design needs to consider the demand of high efficiency in the power transfer. In this paper, a DC–DC power converter for IWPT is proposed. Its topology uses a DC–AC converter in the transmitter circuit and an AC–DC converter in the receptor. The transmitter has an interleaved coupled-Buck converter that integrates two Buck converters connected to a half inverter bridge and a parallel resonant load. The control strategy implemented for the semiconductor switching devices allows two operating modes to obtain a sinusoidal output voltage with a low distortion that makes it suitable in high-efficiency power transfer systems. To obtain a DC output voltage, a full wave bridge rectifier is used in the receptor circuit. The proposed topology and the control strategy are validated with simulation and experimental results for a 15 W prototype.

scholarly journals Simulation-Assisted Design Process of a 22 kW Wireless Power Transfer System Using Three-Phase Coil Coupling for EVs

2021 ◽  
Vol 13 (21) ◽  
pp. 12257
Author(s):  
Chia-Hsuan Wu ◽  
Ching-Ming Lai ◽  
Tomokazu Mishima ◽  
Zheng-Bo Liang
Keyword(s):  
High Power ◽  
Coupling Coefficient ◽  
High Efficiency ◽  
Design Procedure ◽  
Wireless Power Transfer ◽  
Power Converter ◽  
Air Gap ◽  
Power Transfer ◽  
Wireless Power ◽  
Three Phase

The objective of this paper is to study a 22 kW high-power wireless power transfer (WPT) system for battery charging in electric vehicles (EVs). The proposed WPT system consists of a three-phase half-bridge LC–LC (i.e., primary LC/secondary LC) resonant power converter and a three-phase sandwich wound coil set (transmitter, Tx; receiver, Rx). To transfer power effectively with a 250 mm air gap, the WPT system uses three-phase, sandwich-wound Tx/Rx coils to minimize the magnetic flux leakage effect and increase the power transfer efficiency (PTE). Furthermore, the relationship of the coupling coefficient between the Tx/Rx coils is complicated, as the coupling coefficient is not only dominated by the coupling strength of the primary and secondary sides but also relates to the primary or secondary three-phase magnetic coupling effects. In order to analyze the proposed three-phase WPT system, a detailed equivalent circuit model is derived for a better understanding. To give a design reference, a novel coil design method that can achieve high conversion efficiency for a high-power WPT system was developed based on a simulation-assisted design procedure. A pair of magnetically coupled Tx and Rx coils and the circuit parameters of the three-phase half-bridge LC–LC resonant converter for a 22 kW WPT system are adjusted through PSIM and CST STUDIO SUITE™ simulation to execute the derivation of the design formulas. Finally, the system achieved a PTE of 93.47% at an 85 kHz operating frequency with a 170 mm air gap between the coils. The results verify the feasibility of a simulation-assisted design in which the developed coils can comply with a high-power and high-efficiency WPT system in addition to a size reduction.

scholarly journals Management of Multiple-Transmitter Multiple-Receiver Wireless Power Transfer Systems Using Improved Current Distribution Control Strategy

Electronics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1160 ◽  
Author(s):  
Weikun Cai ◽  
Xiaoyang Lai ◽  
Dianguang Ma ◽  
Houjun Tang ◽  
Khurram Hashmi ◽  
...  
Keyword(s):  
Current Distribution ◽  
Control Strategy ◽  
Output Voltage ◽  
Power Flow ◽  
Power Level ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Power Handling Capability ◽  
Multiple Receiver

For high-power single-transmitter single-receiver wireless power transfer (STSRWPT) systems, the coils suffer from high voltage and current stresses. With increased power requirements, the coils become bottlenecks for power flow. To increase the power level, multiple-transmitter multiple-receiver wireless power transfer (MTMRWPT) systems with parallel circuits are developed that reduce the voltage and current stresses on the coils and improve power-handling capability. Firstly, an improved current distribution (ICD) control strategy is developed to simultaneously achieve high transfer efficiency, balanced current distribution and constant output voltage. Secondly, it is further shown that the ICD control strategy has the advantage that the currents at the transmitter coils are balanced and it reduces the control complexity simultaneously. Thirdly, an asynchronous particle swarm optimization (APSO) algorithm is applied to the ICD control strategy to verify the feasibility of the proposed control strategy. Lastly, a two-transmitter two-receiver wireless power transfer (WPT) system based on the ICD control strategy is proved to obtain an efficiency of more than 89.1% and provides the target output voltage 20 V with balanced current distribution.

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