1. Analysis and Design of Combating Field Complications for Wireless Power Transfer
Sharifa Sharfeldden1, Peter Pham2, Dr. Daniel Costinett2
1 The University of Rochester 2 The University of Tennessee, Knoxville
Final posters will be printed before 3:30pm on 07/22/19
Sections
Introduction
Designs in comparison (show two models (doesn’t have to be a picture)
Data and Analysis (what it means)
Conclusion and Suggestions
INTRODUCTION
RESEARCH PURPOSE
Two main issues with shielding in laptops are one, the EMF induced from the eddy current in the shield may oppose the transmitter EMF and two, stray EMF may interfere with non-charging laptop components
This research works towards addressing these issues by exploring a variety of window and slot cuts in the shield. The coupling coefficient of each design was calculated to make meaningful comparisons.
To achieve more flexibility and efficiency, near-field wireless power transfer is being implemented in consumer electronics for wireless charging. Electromagnetic shielding has long been introduced into wireless power transfer models to control and direct the induced fields.
DESIGN AND DATA OUTCOMES
Expectation: The efficiency of the shielding was best maximized by cutting a window that reached just outside of the receiver coil with a slot cut from the window to the end of the sheet.
Method: ANSYS Maxwell was used to first simulate various combinations of windows and slots before lab testing. Via simulation, it was found that a fitted window, shown in Fig. 1, cut to the outer side of the receiver coil with a slot produced the highest coupling coefficient, shown in Fig. 2. Lab testing furthered this point as shown in Fig. 4.
Fig. 2 Simulation Data
Fig.4 Testing Model Data
Receiver Coil
Transmitter Coil
Slot
Fig.1 Simulation Model Schematic
Fig.3 Testing Model
CONCLUSION AND FUTURE GOALS
Conclusion: The aluminum sheet needed to be cut more than anticipated but without trivializing its presence. A ferrite sheet was added above the receiver coil as it increased coupling while directing the rest of the field away from the components in the center of the laptop without disrupting the charging process.
Future Goals: Explore a way to test if and how much electronic components placed above the coils are impacted or disturbed, different slot locations and sizes, and stronger conductive materials.
REFERENCES
Ahn, Hwang, Park 2013, ‘Optimized shield design for reduction of EMF from wireless power transfer systems’, IEICE Electronics Express, vol.*, no.*, 1-9
This work was supported primarily by the ERC Program of the National Science Foundation and DOE under NSF Award EEC Other US government and industrial sponsors of CURENT research are also gratefully acknowledged. Dr. Daniel Costinett and Peter Pham are gratefully acknowledged for their assistance in this research.