Wireless Charger

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Wireless Charger by Mind Map: Wireless Charger

1. Advantages

1.1. convenient

1.1.1. no need for cable

1.2. safe

1.3. durable

2. Disadvantages

2.1. expensive

2.1.1. increasing complexity + cost of manufacturing

2.2. low performance

2.2.1. low efficenyoncy

2.2.2. longer charging time

2.3. limitation

2.3.1. don't allow charge "on-the-go" (must be left on the pad)

2.3.2. difficult to connect to the devices

3. Background

3.1. development

3.1.1. late 1800s - early 1900s

3.1.1.1. wireless broadcasting & power transmission

3.1.2. 2008

3.1.2.1. Qi norm

3.1.3. 2012

3.1.3.1. Powermat (PMA)

3.1.4. 2012

3.1.4.1. Alliance for Wireless Power (A4WP)

3.1.4.1.1. not available now

3.2. battery lifespan

3.3. technology

3.3.1. standards

3.3.1.1. Qi

3.3.1.1.1. Inductive charging

3.3.1.1.2. 100 - 205kHz

3.3.1.1.3. 5mm of coil distance

3.3.1.1.4. widest global use

3.3.1.2. Powermat

3.3.1.2.1. inductive charging

3.3.1.2.2. 277 - 357kHz

3.3.2. inductive charging

3.3.2.1. magnetic field

3.3.2.2. primary & secondary coil

4. Applications

4.1. smart phones

4.2. laptops

4.3. tablets

4.4. electric toothbrushes

4.4.1. first consumer goods of this techine

5. Safety Problem

5.1. overheat

5.1.1. devices

5.1.2. wireless charger pads

6. Comparison

6.1. differences between wireless charger  and plug charger

6.1.1. function

6.1.2. security

6.2. only available for a few model

6.3. Less risk of electrical faults

7. Questionnaire