1. TAMIM ALKHONAINI
UBONG UDOSSIEN
NADEEM QANDEEL
Wireless Power
Charging System
Advisor:
Dr. Yao
Committee:
Dr. Petzold
Dr. Glazos

2. OUTLINE
o BACKGROUND
o PROBLEM STATEMENT
o GOALS
o REQUIREMENTS/ SPECIFICATIONS
o PROJECT CHANGES
o ACCOMPLISHMENTS
o TESTING/ RESULTS
o PROBLEMS
o TIMELINE
o BUDGET
o CONCLUSION
o REFERENCES

3. BACKGROUND
 Transmission of electrical power without the need of conducting
wires.
 Applications of wireless power systems could extend to higher
power applications, like; electric vehicles.
 Increase in demand for wireless power mobile charging devices.
 A widespread interest in finding new applications in consumer
products.

4. PROBLEM STATEMENT
 The aim of the project is to produce a demonstration of
wireless power system for charging a mobile phone and
illustrate how magnetic coupling can be used to transfer
energy wirelessly.

5. GOALS
 Illustrate how inductive power transfer work.
 Transferring sufficient power for charging a mobile phone based on
the Qi standard.
 Wireless power demonstrator system to charge multiple mobile
phones.
 Analyzing and improving power efficiency levels.

6. Wall outlet
Transformer Oscillator
AC/DC
Rectifier
Regulators
Sensors
Switches
Microcontroller
Bluetooth
Communication
Module
LCD
Coils
Coils
Interface
Coupling
Phone
Transmitter
Receiver
High AC V/Low f
Low AC V/Low f
High f
Low AC V3 V
7 V
5 V
7 V each
AC/DC
Rectifier
Regulators
System Block Diagram
Transmitter
Receiver

7. SYSTEM REQUIREMENTS
 A transmitter base station that supplies wireless power to Qi phones.
 A receiver that allows phones without Qi to be charged.
 Charge a phone wirelessly from a small distance of few millimeter,
possibly extending it to 1 cm or 2 cm on the long run.
 Charge the phone efficiently within a reasonable amount of time.
 Charge multiple phones on the long term.
 Ability to form communication between device and station.
 Displaying informative information to users on a screen.

8. SYSTEM SPECIFICATIONS
Parameter Symbol Value
Outer diameter do 43+-0.5mm
Inner diameter di 20.5+-0.5mm
Thickness dc 2.1+-0.5mm
Number of Turns per
Layer
N 10
Number of Layers – 2
A1 Primary Coil Design

9. SYSTEM SPECIFICATIONS
Receiver coils

10. Shielding of Power Transmitter Design A1
The alignment aid in this case would be a helped by the disc shaped magnet in the center
of the coil. This magnet would align with a similar positioned magnet in the secondary coil.
Shielding must extend at least 2mm beyond the outer diameter of the primary coil and
have a thickness of at least 0.5mm. A distance, ds = 1mm is need between the shielding
and primary coil. The shield most comprise of a material chosen from a definite list of
materials given in the Qi design specification.

11. SYSTEM SPECIFICATIONS
• The inductance of the primary coil, Lp
along with the shielding and magnet is
24μH and the value of the series
capacitor, Cp = 100nF.
• An input voltage of about 20V is
required to the half bridge inverter.
Power Transmitter A1 design

12. PROJECT CHANGES
 Alternative to Bluetooth for communication.
 Generating PWM from microcontroller.
 Charge only 2 phones rather than a bigger number.
 Change in circuit design.
 Use resonant frequency coupling.

13. ACCOMPLISHMENTS
 Generating a PWM signal with high frequency.
 Detecting objects with weight sensor.
 Showing informative messages on LCD.
 Charging light indicator.
 Receiver charging circuit.
 Transmitter charging circuit.

14. (Schematic)
• Phone type: iPhone 4s
• Charging Voltage: 5 V
• Required Current: 1 A
• Required power: 5 W
• Voltage Regulator (LM7805C) is used
to have an output of 5 V
(Results)
Receiver Unit Simulation
TESTING/ RESULTS

15. TESTING/ RESULTS
 Voltage Regulator (LM7805C) is
used to have an output of 5 V.
 Input using function generator.
 Vpp = 7 V
 Frequency = 110 KHz
 wave type: sine
 Output readings:
 Voltage = 4.9 V
 Current = 0.7 A
 Add pictures of breadboard,
multimeter, function generator,
and phone when it is being
charged.
Receiver Unit Implementation

16. TESTING/ RESULTS
 Input: function generator
 Time to be fully charged=
 Input: coils (magnetic induction)
 Time to be fully charged =
Receiver unit

17. PROBLEMS
 LCD buttons
 PWM 4 output
 Receiver circuit
 Transmitter circuit

18. FUTURE WORK
 Goals for the first semester include:
 Design and Build the transmitter base station
 Design and build power system
 Design and Build the receiver
 Test one charging unit
 Goals for the second semester include:
 Modify the design
 Bluetooth communication
 LCD Output

19. SCHEDULE
GANNT CHART
Task Start Date
Duration
(Days) End Date
Research 1/12/2015 34 2/15/2015
Proposal 1/20/2015 31 2/20/2015
Shopping 3/15/2015 15 4/1/2015
Design & Simulation 2/28/2015 5 3/5/2015
Parts Testing 3/3/2015 7 3/10/2015
Transmitter Testing ????? ???? ????
Receiver Testing 3/20/2015 30 4/19/2015
Arduino Testing 3/23/2015 23 4/15/2015
Progress Report 4/21/2015 14 5/5/2015
Hardware Demo 4/27/2015 4 5/1/2015
Communication 9/15/2015 30 10/15/2015
Evaluation 10/20/2015 5 10/25/2015
Improvements 10/25/2015 21 11/15/2015
Final Hardware
Demo 12/7/2015 3 12/10/2015
Final Report 11/20/2015 26 12/16/2015

20. BUDGET
item Number of units Price per unit
Sensors 3 $ 4.00
Transmitter Coils 3 $ 10.00
Receiver Coils 1 $ 8.00
Shipping $ 30.00
Budget (2nd semester)
Total cost is $ 77.00
item Number of units Price per unit
LCD Display Board 1 $ 20.00
Transmitter Coils 1 $ 10.00
Receiver Coils 1 $ 8.00
Arduino 1 $ 30.00
Bluetooth Module 1 $ 35.00
Sensor 1 $ 4.00
USB breakout 1 $ 10.00
Shipping $ 30.00
Budget (1st semester)
Total cost is $ 147.00

21. CONCLUSIONS
What we hope to achieve in this project is a wireless
charging system, that is convenient in it is operation,
efficient in power transfer, smart in communication and
data transfer.
In this presentation, we highlighted four sections; power
system, charging system, the control and communication
system.
Using the concept of induced coupling in strict adherence
to the Qi Standard we should be able to successfully
design a functional wireless power transmitter.

22. REFERENCES
 1) The Qi interface specification, System Description Wireless Power
Transfer Volume I: Low Power Part 1: Interface Definition,
http://www.wirelesspowerconsortium.com/blog/11/qi-specification-
available-for-download
 2) Power By Proxy, Wireless Charging ,
http://powerbyproxi.com/wireless-charging/
 3) Inductive Power Transfer, http://www.instructables.com
 4) Engaged Primed: how wireless and inductive charging works,
http://www.engadget.com/2011/06/24/engadget-primed-how-
wireless-and-inductive-charging-works/