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

Wireless Charging Proposal

Feb 13, 2017




Tamim alkhonainiUbong udossienNadeem QandeeLWireless Power Charging System

Advisor:Dr. Yao

Committee:Dr. PetzoldDr. Glazos


BACKGROUNDTransmission 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.


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.

GOALSIllustrate 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.

System Block DiagramTransmitterReceiver

SYSTEM REQUIREMENTSA 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.


ParameterSymbolValueOuter diameterdo43+-0.5mmInner diameterdi20.5+-0.5mmThicknessdc2.1+-0.5mmNumber of Turns per LayerN10Number of Layers2

A1 Primary Coil Design


Receiver coils

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.


The inductance of the primary coil, Lp along with the shielding and magnet is 24H 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

PROJECT CHANGESAlternative 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.

ACCOMPLISHMENTSGenerating 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.


Phone type: iPhone 4sCharging Voltage: 5 VRequired Current: 1 ARequired power: 5 WVoltage Regulator (LM7805C) is used to have an output of 5 V(Results) Receiver Unit Simulation TESTING/ RESULTS


Voltage Regulator (LM7805C) is used to have an output of 5 V.Input using function generator.Vpp = 7 VFrequency = 110 KHzwave type: sineOutput readings: Voltage = 4.9 VCurrent = 0.7 AAdd pictures of breadboard, multimeter, function generator, and phone when it is being charged. Receiver Unit Implementation


Input: function generator Time to be fully charged= Input: coils (magnetic induction)Time to be fully charged = Receiver unit

PROBLEMSLCD buttonsPWM 4 outputReceiver circuitTransmitter circuit

FUTURE WORKGoals for the first semester include:Design and Build the transmitter base station Design and build power systemDesign and Build the receiverTest one charging unitGoals for the second semester include:Modify the designBluetooth communicationLCD Output


GANNT CHARTTask Start DateDuration (Days)End DateResearch1/12/2015342/15/2015Proposal 1/20/2015312/20/2015Shopping3/15/2015154/1/2015Design & Simulation2/28/201553/5/2015Parts Testing3/3/201573/10/2015Transmitter Testing ?????????????Receiver Testing3/20/2015304/19/2015Arduino Testing3/23/2015234/15/2015Progress Report4/21/2015145/5/2015Hardware Demo4/27/201545/1/2015Communication 9/15/20153010/15/2015Evaluation 10/20/2015510/25/2015Improvements10/25/20152111/15/2015Final Hardware Demo12/7/2015312/10/2015Final Report11/20/20152612/16/2015

BUDGETitemNumber of unitsPrice per unitSensors 3$ 4.00 Transmitter Coils 3$ 10.00Receiver Coils 1$ 8.00Shipping$ 30.00

Budget (2nd semester) Total cost is $ 77.00itemNumber of unitsPrice per unitLCD Display Board1$ 20.00 Transmitter Coils 1$ 10.00Receiver Coils 1$ 8.00Arduino1$ 30.00Bluetooth Module1$ 35.00Sensor 1$ 4.00USB breakout1$ 10.00Shipping$ 30.00

Budget (1st semester)Total cost is $ 147.00

CONCLUSIONSWhat 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.


1) The Qi interface specification, System Description Wireless Power Transfer Volume I: Low Power Part 1: Interface Definition, Power By Proxy, Wireless Charging , Inductive Power Transfer, http://www.instructables.com4) Engaged Primed: how wireless and inductive charging works,

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