Wireless charging uses electromagnetic fields to transfer power without physical connection. It was first conceived in 1902 by Tesla and researchers demonstrated efficient mid-range transfer in 2006. The Wireless Power Consortium formed a low-power inductive charging standard in 2009. Wireless charging can be close range inductive or mid-range resonant, and aims for long range transfer. Benefits include convenience while drawbacks include disconnects and lack of intelligence. Future development may enable high power robotics and wearable charging.

1. Yue Wai Sze(17226279)
Xie Xin Ying(16251172)
Tse Man Fung (17225647)
Wireless
Charging
29 November 2017

2. Contents
Definition History Principle Types Pros & Cons Development

3. Definition
• Wireless charging uses electromagnetic fields to safely transfer
power from a transmitting source to a receiving device for the
purposes of wirelessly charging a battery, without using a
physical connection.

4. History
1902
• Tesla filed a patent titled
“Apparatus for Transmitting
Electrical Energy” in which
he describes a device that
he believed could transmit
electrical power from one
conductor to another
without the need for wires.
2006
• researchers at the MIT
reported that they had
discovered an efficient way
to transfer power between
coils separated by a few
meters.
2009
• a consortium of interested
companies called the
Wireless Power Consortium
announced they were
nearing completion for a
new industry standard for
low power Inductive
charging .

5. Principle
Wireless power transmission technologies
Use time-varying electric, magnetic, or electromagnetic fields.

6. Types
1. CLOSE RANGE
- Inductive charging technology.
- High efficiency, cost effective to deploy and easy to design and
work with.
- Supports a variety of devices, even the big ones like vehicles.

7. MID RANGE
- Uses resonance charging.
- Available in the market in 2016.
- Wireless charging becomes more accessible and can be installed
in more areas.
- Qi and Rezence (A4WP)
Types

8. Types
2. LONG RANGE (Not available now)
- Use a variety of different technologies, including radio
frequencies, infrared light, ultrasound etc.
- Long range charging is considered the holy grail of wireless
charging.
- Efficiency is questionable with long range charging as energy is
lost to the environment.
- likely only be limited to low power devices.

9. Types

10. Pros
• About a half of the
responders have positive
viewpoint of the wireless
charging.
• Another 21.9% have no
particular thoughts about
the wireless charging.
• The rest of 15.6% have
positive viewpoint to the
wireless charging.

11. Pros
• NO WIRE
• FREE
• EASY TO TAKE AWAY
• CONVENIENT

12. 1. Because they are not smart enough sometimes.
2. Connecting difficulty(Easy to be disconnected).
Cons

13. Development
• As advancements continue to be made, wireless charging will
likely become more ubiquitous and convenient.
-medicine and medical care.
-be high power autonomous charging for robotics and
unmanned vehicles.
-Wearable technology is becoming increasingly integrated and
available in our daily lives.

14. Development

15. Reference
• https://www.youtube.com/watch?v=JGcgEXUgIkA
• https://powerbyproxi.com/wireless-charging/#future-of-
wireless-charging
• https://www.chargespot.com/news/state-of-wireless-charging-
the-present-and-the-future/