This document discusses wireless charging technology. It works using electromagnetic induction between coils, transferring energy through electromagnetic waves without wires. There are different types of inductive coupling like resonant and normal coupling that can transfer power over short or long ranges. Resonant inductive coupling is more effective using coupled mode theory. Wireless charging has advantages of convenience but also inefficiencies and limitations. Standards like Qi are used to ensure safety and compatibility.

1. Wireless Charging
And everything you need to know about it

3. What is it?
• Wirelessly transfer energy with EM waves.
How does it work?
• Using coils, electricity and principles of electromagnetism.
What principles?
• Biot-Savart Law
• Ampere’s Law
• Faraday’s law of EM Induction

4. Electric CurrentGenerated
Magnetic Field
Electricity
To
Magnetism
Magnetism
To
Electricity
Changing Magnetic Field
(Moving Magnet)
Flux in Coil
Generated Current
Eureka!

5. Thanks to
Electromagnetic Induction
We have transferred
Electric energy
through the
Air!!

6. Types of
Inductive
Coupling
Resonant
Coupling
Normal
Coupling
Short Range
IC<2m
Medium Range
IC <10m
Long Range
>10m

7. Resonant Inductive Coupling
The Advantage:
the coupling becomes stronger
when the "secondary" (load-
bearing) side of the loosely
coupled coil resonates.

8. Coupled Mode Theory
An approach for analyzing the coupling
of vibrational systems.
(In this presentation, Resonant Inductive
Coupling Systems)
Assumptions required when working with CMT:
• Linearity
• Time-reversal symmetry
• Time-invariance
• Weak mode coupling (small perturbation of uncoupled
modes)
• Energy conservation
Helmholtz Equation
Provides Power Transfer relation between 2 resonating
inductive coupled coils

9. Regulations and Safety
Standards
• no direct electrical connection is
needed and hence no possibility of
electric shock
• Conforms to ICNIRP standards
[International], CE [European Union],
F.C.C. [North America]
Characteristic Components
• Resonant Transformer
• High Frequency band pass filter
• Resonance coils
• High Frequency Oscillator
Applications
• Inductive Coupling Systems (Power
Transfer)
• WiTricity
• Rezence
• Qi wireless power transfer
• eCoupled
• Wireless Resonant Energy
Link (WREL)
• Data transmission in passive RFID tags
• Resonant transformer of CCFL inverter
• High voltage X-ray production
• The Tesla Coil

10. Qi Wireless Mobile Charging Technology
D I S P L A Y
Digitizer and Stiffener
PCB
Back Plate (Plastic/Glass only)
Front Cover (Plastic/Glass)
M e t a l S h i e l d
PCB + Components Heat Sink (Fan if necessary)
Base Cover
High Frequency
Alternating Flux
Power COIL
Battery
Radio Antenna & COIL

12. WIRELESS (INDUCTIVE) CHARGING
ADVANTAGES
No Corrosion Durable
Driving
Convenience
Ease-of-use
No Plugging
(Automatic
Charge)
DISADVANTAGES
Slower
Charging
Expensive
No Range of
Movement
Incompatible
Standards
Power
Inefficient

13. Human
Brain
Complex
Neural
Networks
Delicate
Electrical
Activity
Weak
Magnetic
Fields
High Power
External
EM Waves
Interference
Neural
Activity
Disrupted
Cognitive
Health
Affected
Possibility
of Tumors

14. End Summary & Conclusions
• Wireless Charging works on principles of electromagnetism.
• Inductive Coupling is the technology behind it.
• Resonant Circuits are better for inductive coupling.
• Multiple Standards exist unlike the universal Micro-USB port.
• The Qi standard is the most popular one used by most Tech
Conglomerates.
• Wireless charging has a lot of drawbacks, like low efficiency.
• Despite all that, Wireless Charging is still pretty DOPE.

15. አመሰግናለሁ