The document describes the development of a wireless induction modem that can wirelessly charge connected devices using inductive coupling and transmit data without wires. The proposed system includes modules for inductive charging, power saving when not in use, controlling connected devices remotely via radio frequency, and error detection/correction during data transmission. It aims to create a more portable wireless modem and access point that can simultaneously charge devices and stream data without wires in a power efficient manner.

1. DEVELOPMENT OF WIRELESS
INDUCTION MODEM
-B.AJAY
-V.PRASANTH

2. OUTLINE
• Abstract
• Introduction
• Literature survey
• Existing system
• Proposed system
• Hardware requirements
• Working principle
• Conclusion

3. ACKNOWLEDGEMENT
• We would like to acknowledge Dr. K. Kokula
Krishna Hari, Founder & Country Head of
ASDF for his guidance.
• We would like to thank the staff of Velammal
Institute of technology, S.R.M. University and
Amritha University for their guidance and
support.
• Finally we would like to thank our family, friends
and god for their cooperation and help.

4. ABSTRACT
• Objective is to create an inductively coupled wireless
fidelity charger.
• It inductively charges the devices connected to it.
• Effective transmission of data takes place and error
correction techniques are employed.
• Device is found to be power efficient .

5. INTRODUCTION
• In this world of technological advancement, we still
rely on conventional methods for charging and data
transmission.
• The conventional wire system creates a mess when it
comes to charging several devices simultaneously.
• Wireless Power Transmission (WPT) is used for
transmitting data to several devices.
• Error correction techniques are employed in order to
prevent any incorrect data to be transmitted.

6. LITERATURE SURVEY
• Contactless inductive charging system with hysteresis loop control for small-sized
household electrical appliances, Jia-You Lee; Dept. of Electrical Eng., Nat. Cheng
Kung Univ., Tainan, Taiwan ; Hung-Yu Shen; Tsung-Wen Chang.
» The contactless power transmission technique is investigated for inductive charging system of small-sized
household electrical appliances. The application category of contactless power transmission will be briefly
discussed.
• F. Sato, T. Nomoto, G. Kano, H. Matsuki, and T. Sato, "A new contactless
power-signal transmission device for implanted functional electrical
stimulation (FES)," .
» This paper proposes a new contactless power-signal transmission device using electromagnetic coupling
for a functional electrical stimulation system, which consists of two coils. With the primary coil outside
and the secondary inside the body.
• Wireless Charger for Low Power Devices using Inductive Coupling by
Tahsin, Naim Muhammad 08-11718-2Siddiqui, Md. Murtoza 08-11646-2.
» The objective of this project is to design and construct a method to transmit wireless electrical
power through space and charge a designated low power device.

7. EXISTING SYSTEM
• Modems are basically used to send and
receive data.
• The modems which are available are charged
through wires.
• They have to be placed near a power supply,
thus reducing the portability of the modem.
• Multiple routers are used for signal
strengthening .

8. PROPOSED SYSTEM
• To create an inductively coupled wireless
fidelity charger.
• To make the modem an access point for the
connected devices that needs to be
controlled.
• To reduce the power consumption of the
modem.

9. HARDWARE REQUIRED
• QI Wireless Charger PCBA Circuit Board.
• D-Link 300 Mbps N 300 4-Ports Ethernet
Router & ADSL Wireless Router (DSL-2750U).
• RF remote controller(radio frequency
transmitter and receiver).
• Mobile devices and electrical appliances.

10. WORKING PRINCIPLE
• The prototype model has been split into 4
modules for a better understanding .
• The 4 modules are given below
» Inductive charging module
» Power saving module
» Device controlling module
» Error detection and control module

11. STEP BY STEP EXPLANATION OF WORKING
PRINCIPLE
• Modem first charges itself with the help of a strong
electromagnetic field from the charging station .
• This same electro-magnetic field is used to charge
every other inductive and Wi-Fi enabled device in
range.
• Authorization is required for the device to connect to
the modem (to access the Wi-Fi network) and to be
charged inductively.

12. INDUCTIVE CHARGING MODULE
• In the prototype model, the device gets charged and charges
other devices by resonant induction .
• Inductive charging uses an electromagnetic field to transfer
energy between two objects.
• A charging station is used to charge the modem and the
devices connected to it.
• An electric current of 25v is supplied to the charging dock
which is placed in accordance to the proximity sensor.

13. POWER SAVING MODULE
• When a device is connected to the modem and internet
access is authorized, information is either uploaded or
downloaded (or both) at any given instant.
• Hence, if there is no upload or download in progress, it is
obvious that no device is connected to the modem .
• If no device is connected, the modem can automatically be
switched off saving power and data .
• This ensures efficiency of the model and also prevents the
security and safety of the network from being compromised.

14. DEVICE CONTROLLING MODULE
• To control devices, an RF remote control programmed into a
modem is used.
• RF remote control is used as it sends out radio frequencies (
like Wi-Fi modems ) instead of light signals . Also, the range of
RF remote control is impressive .
• The modem does it’s work of being an internet access point
while the embedded radio frequency (RF) remote sends out
radio frequencies which will be received and decoded by the
connected device(s).
• The final modem/remote byproduct obtained will basically be
like a modem with buttons of a remote control integrated
onto it.

15. ERROR DETECTION AND CONTROL
MODULE• Wireless transmission is an unreliable communication
channel.
• For data error detection, the CRC( cyclic redundancy check)
technique is used to check if the transmitted data has errors
or not .
• A CRC is a single-burst-error-detecting cyclic code and non-
secure hash function designed to detect accidental changes to
digital data in computer networks.
• For error correction we use Forward error Correction as it is
the only error – correction scheme that actually detects and
corrects transmission errors when they are received without
retransmission.

16. TRANSMITTER

17. RECEIVER

18. ADVANTAGES
• The prototype model is found to be highly
power efficient
• The chances of error occurring is minimized .
• The device is found to be even more portable
with respect to the new device.
• This devices monitors activity.

19. DISADVANTAGES
• It is tough to create an E.M.F of a very high
voltage
• High amount of heat radiation is emitted .
• The devices have to be inductively chargeable

20. CONCLUSION
• The proposed system integrates more than
one transmission device(data and power) into
a single device.
• The system transmits the data to the devices
that are connected.
• This project is helpful to provide efficient
power consumption.

21. REFERENCE
• [1] Russell M Kerchner and George F Corcoran, ―Alternating-Current Circuits‖, pp. 273-324,
1960.
• [2] G. Grandi, M.K. Kazimierczuk, A. Massarini, ―Optimal Design of Single-Layer Solenoid Air-
CoreInductors for High Frequency Applications‖, Circuit Systems, Vol. 1, pp. 358-361, 1997.
• [3] A. Kurs, A. Karalis, R. Moffatt, J. D. Joannopoulos, P.Fisher, M. Soijacic, ―Wireless
Power Transfer via Strongly Coupled Magnetic Resonances‖, Massachusetts Institute of
Technology, 2007Science, Vol. 317. no. 5834, pp. 83 —86, 2007.
• [4] Jacob Millman and Christos C. Halkias, ―Integrated Electronics: Analog and Digital Circuits
andSystems‖, pp. 103-107, 2012.
• [5] Muhammad H. Rashid, ―Power Electronics: Circuits, Devices, and Applications‖, pp.37-
63, 2nd Edition, 2010.
• [6] Robert L. Boylestad and Louis Nashelsky,‖Electronic Devices and Circuit Theory‖,9th
Edition,2006, pp. 79-82.
• [7] William H.Hayt,Jr. and John A.Buck,‖Engineering
Electromagnetics‖,7thEdition,2012,pp.292-299.
• [8]http://info.ee.surrey.ac.uk/Workshop/advice/coils/air_coils.html.
• [9] http://en.wikipedia.org/wiki?curid=10375..

22. THANK YOU