This document discusses a batteryless phone prototype that was developed by researchers. The phone is able to operate without a battery by harvesting energy from ambient light and radio frequency signals using a small photo diode. It converts the harvested light and RF energy into direct current power that allows the phone to perform basic calling functions. While this prototype demonstrates the potential of batteryless phones, their range is currently limited and they lack many features of traditional smartphones. Researchers hope to expand the technology to add capabilities like encryption, video streaming, and internet access in the future.

1. GUIDED BY ABHIRAM J
MR.SREEHARI V K REG NO:17201080
(Lecture of ECE) ROLL NO:01
1

2. CONTENTS
 INTRODUCTION
 HOW ITS WORKS
 ADVANTAGES
 LIMITATIONS
 FUTURE ENHANCEMENTS
 CONCLUTION
 REFERENCES
2

3. INTRODUCTION
 Even the companies that sell smart phones at
phenomenal rates have the issue of battery’s
performance.
 The performance is better as compared to others, but it is
still a mystery if discussed in terms of long life.
3

4. What is batteryless phone?
 Needed no battery.
 Phone used to only calling function.
 device uses a minute photo diode to harvest energy from the
ambient light or RF sources.
 It operate the RF wave to convert DC power.
4

5. Conversion of RF to DC power
5

6. WORKING
 Antenna receive RF wave.
 RF to DC converter convert radio frequency signal
to DC.
 Power condition check the required voltage and fed
to the output.
6

7. Conversion of Signals to Power
 A photo diode for converting ambient signals and
light into current.
 It is a semiconductor, with p-n junction diode and an
intrinsic layer between two junctions.
 When photons of energy greater than 1.1 electron volt
(eV) strike the diode, electron-hole pairs are
originated.
7

8.  Holes proceed toward the anode and the electrons
move toward the cathode(generate photo current).
 The sum of photocurrents and dark currents, which
flow with or without light.
 It is the amount of current progressing through the
photodiode.
 Small amount of power is generated in the battery less
phone with the assistance of a tiny photo diode.
8

9. Structure of a simple photo
diode
9

10. PROTOTYPE
 The team of researchers utilized the shell components on a
printed circuit board.
 It perform basic functions like calling someone up and then
hanging up the call without any inadequate call drops.
 A custom base station collects the data in form of digital
packages with the help of a “Backscatter.”
 The device inherits the signals with a technology referred as
“Zero Power Amplitude Modulation.”
10

11. SHELL COMPONENT
11

12. BACK SCATTER
12

13. How solar cell works?
 Solar cell constitutes of P-N junction diode, which is
assembled from Silicon and Germanium.
 This process constructs open space for light to fall on P layer
and hence underlying the P-N junction.
 The bottom of N layer comprises of current assembling
electrode.
 When a light photon arrives at the junction, they exhilarate
electrons from valence band to conduction band.
13

14. A solar cell used as in the
battery less phone
14

15. ADVANTAGES
 Conserves Electricity
 Saves Time
 Low Power Consumption
 No Charging Issues
15

16. LIMITATIONS
 Limited range
 Use of solar cell
 Lacking multiple operational features
16

17. FUTURE SCOPE
 Increase in the range
 Encryption
 Video streming
 Internet access
 Low power E-ink display
17

18. CONCLUSION
 It was extremely astonishing to witness that a group of
researchers have finally developed a phone that uses no
power.
 which means the phone has no battery and harnesses energy
from ambient signals and light sources.
 That convert light and signal strength into a current which is
furthermore converted into few microwatts of power.
 With the phone, we can just dial a number and call to another
person.
18

19. REFERENCE
 Paret, Dominique. RFID at ultra and super high frequencies:
Theory and application. John Wiley & Sons, 2009.
 Shin, Choonsung, Jin-Hyuk Hong, Anind K. Dey,
"Understanding and prediction of mobile application usage for
smart phones", In Proceedings of the 2012 ACM Conference
on Ubiquitous Computing, pp. 173-182. ACM, 2012.
 Goodenough, John B., Kyu-Sung Park,"The Li-ion
rechargeable battery: A perspective." Journal of the American
Chemical Society 135, No. 4, pp. 1167-1176, 2013
19

20. 20

21. 21