scholarly journals Generalized Design Approach on Industrial Wireless Chargers

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2697 ◽  
Author(s):  
Vladimir Kindl ◽  
Michal Frivaldsky ◽  
Martin Zavrel ◽  
Miroslav Pavelek
Keyword(s):  
Conceptual Design ◽  
Design Strategy ◽  
Resistive Load ◽  
Wireless Power ◽  
Electrical Parameters ◽  
Paper Briefly ◽  
Electromagnetic Design ◽  
Leakage Magnetic Field ◽  
Experimental Laboratory ◽  
Standards And Regulations

The paper briefly discusses the most important standards and regulations established for high-power wireless power transfer systems and introduces the main issues concerned with the conceptual design process. It analyses the electromagnetic design of the inductive magnetic coupler and proposes key formulas to optimize its electrical parameters for a particular load. The method applies to both the resistive load and the battery charging. It also suggests basic topologies for conceptual design of power electronics and discusses its proper connection to the grid. The proposed design strategy is verified by experimental laboratory measurement including analyses of the leakage magnetic field.

scholarly journals Theoretical and Practical Design Approach of Wireless Power Systems

2021 ◽  
Author(s):  
Vladimir Kindl ◽  
Michal Frivaldsky ◽  
Jakub Skorvaga ◽  
Martin Zavrel
Keyword(s):  
Power Systems ◽  
Conceptual Design ◽  
Mathematical Concept ◽  
Wireless Power ◽  
Key Factors ◽  
Electromagnetic Design ◽  
Factors Influencing ◽  
Leakage Magnetic Field ◽  
Experimental Laboratory

The paper introduces the main issues concerned with the conceptual design process of wireless power systems. It analyses the electromagnetic design of the inductive magnetic coupler and proposes the key formulas to optimize its electrical parameters for a particular load. For this purpose, a very detailed analysis is given focusing on the mathematical concept procedure for determination of the key factors influencing proper coupling coils design. It also suggests basic topologies for conceptual design of power electronics and discusses its proper connection to the grid. The proposed design strategy is verified by experimental laboratory measurement including analyses of leakage magnetic field.

scholarly journals Analysis and Introduction of Effective Permeability with Additional Air-Gaps on Wireless Power Transfer Coils for Electric Vehicle Based on SAE J2954 Recommended Practice

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4797 ◽  
Author(s):  
Dongwook Kim ◽  
Hongseok Kim ◽  
Anfeng Huang ◽  
Qiusen He ◽  
Hanyu Zhang ◽  
...  
Keyword(s):  
Coupling Coefficient ◽  
Effective Permeability ◽  
Impedance Matching ◽  
Wireless Power Transfer ◽  
The Self ◽  
Power Transfer ◽  
Wireless Power ◽  
Electrical Parameters ◽  
Testing Procedures ◽  
Receiving Coil

The wireless power transfer (WPT) method for electric vehicles (EVs) is becoming more popular, and to ensure the interoperability of WPT systems, the Society of Automotive Engineers (SAE) established the J2954 recommended practice (RP). It includes powering frequency, electrical parameters, specifications, testing procedures, and other contents for EV WPT. Specifically, it describes the ranges of self-inductances of the transmitting coil, the receiving coil, and coupling coefficient (k), as well as the impedance matching values of the WPT system. Following the electrical parameters listed in SAE J2954 RP is crucial to ensure the EV wireless charging system is interoperable. This paper introduces a method for adjusting the effective permeability of the ferrite blocks in the standard model, to tune the self-inductance of the coils as well as the coupling coefficient. To guarantee the given values of the self-inductance of the coil and coupling coefficient matched those in the standard, we slightly modified the air-gap between the ferrite tiles in a specific region. Based on this method, it was possible to successfully tune the self-inductance of the transmitting coil and receiving coil as well as the coupling coefficient. The proposed method was verified by simulation and experimental measurements.

scholarly journals A Copper Foil Electromagnetic Coupler and Its Wireless Power Transfer System without Compensation

2021 ◽  
Vol 12 (4) ◽  
pp. 191
Author(s):  
Xueying Wu ◽  
Mingxuan Mao
Keyword(s):  
Copper Foil ◽  
Equivalent Circuit Model ◽  
Wireless Power Transfer ◽  
Circuit Model ◽  
Transfer System ◽  
Coupling Theory ◽  
Power Transfer ◽  
Wireless Power ◽  
Electrical Parameters ◽  
Wireless Power Transfer System

This paper proposes a copper foil electromagnetic coupler integrating inductance and capacitance and its wireless power transfer (WPT) system without additional compensation structure. Firstly, the equivalent circuit model of the integrated electromagnetic coupler is established, and the circuit model is simplified based on the circuit theory and mutual inductance coupling theory. The self-compensating characteristics of the coupler are utilized to analyze and design the relation between electrical parameters of the system, and the basic conditions of full resonance working of the system are given. The system’s performance is verified by simulation.

scholarly journals A Wirelessly Rechargeable AA Battery Using Electrodynamic Wireless Power Transmission

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2368
Author(s):  
Spencer E. Smith ◽  
Miah A. Halim ◽  
Stasiu T. Chyczewski ◽  
Adrian A. Rendon-Hernandez ◽  
David P. Arnold
Keyword(s):  
Power Management ◽  
Power Transmission ◽  
Low Frequency ◽  
Electrolytic Capacitor ◽  
Prototype System ◽  
Resistive Load ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Storage Cell ◽  
And Function

We report the design, fabrication, and characterization of a prototype that meets the form, fit, and function of a household 1.5 V AA battery, but which can be wirelessly recharged without removal from the host device. The prototype system comprises a low-frequency electrodynamic wireless power transmission (EWPT) receiver, a lithium polymer energy storage cell, and a power management circuit (PMC), all contained within a 3D-printed package. The EWPT receiver and overall system are experimentally characterized using a 238 Hz sinusoidal magnetic charging field and either a 1000 µF electrolytic capacitor or a lithium polymer (LiPo) cell as the storage cell. The system demonstrates a minimal operating field as low as 50 µTrms (similar in magnitude to Earth’s magnetic field). At this minimum charging field, the prototype transfers a maximum dc current of 50 µA to the capacitor, corresponding to a power delivery of 118 µW. The power effectiveness of the power management system is approximately 49%; with power effectiveness defined as the ratio between actual output power and the maximum possible power the EWPT receiver can transfer to a pure resistive load at a given field strength.

Design of Multi-function Power Factor Instrument with STM32

2020 ◽  
Vol 13 (6) ◽  
pp. 925-932
Author(s):  
Wenjuan Qi ◽  
Jixuan Gao ◽  
Zhongxian Wang
Keyword(s):  
Circuit Design ◽  
Relative Error ◽  
Power Factor ◽  
Reactive Power ◽  
Resistive Load ◽  
Electrical Parameters ◽  
Current Frequency ◽  
Software Program ◽  
Hardware Circuit ◽  
Maximal Relative Error

Background: A multifunctional power factor device based on the FFT algorithm has been designed. The digital panel can display power factor, voltage, current, frequency, phase angle, active power and reactive power. Objective: To solve the influence of the harmonic interference and the aperiodic component on the accuracy of power factor measurement. Methods: In this paper, by combining a fixed-point 256-point FFT algorithm and taking STM32 as the core microcontroller, the hardware circuit and the software program are designed respectively. The hardware circuit is tested and analyzed in practice. Among them, the hardware circuit mainly includes the main circuit design, STM32 control circuit design, EMI and second-order RC filter circuit design, sampling circuit design, and signal conditioning circuit design. The software program mainly includes the main program, AD conversion subroutine, voltage and current acquisition subroutine, LCD display subroutine and twirl factor array. FFT algorithm is achieved by the table look-up method. Results: Finally, the hardware circuit is built and the software program is debugged to test the designed device. The experimental results show that the designed power factor instrument meets the task requirements under the different types of loads. Conclusion: After processing and analyzing the measurement results, it can be concluded that: under the pure resistive load, the maximal relative error of electrical parameters is 4.49%; and under the resistive inductive load, the maximal relative error of electrical parameters is 2.86%. Both results meet the design requirements.

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