Car Wireless charging scheme based on Electromagnetic induction

During the long distance journey or business trip, in case the mobile phone battery runs out, people's normal lives have a great impact on the work. Now there have been car parts car cell phone chargers, but due to the different brands of mobile phone charging interface there is a big difference, so if you want to complete charging must be carried in the car charger that matches with their mobile phones, is not very convenient. And because the car power supply is limited, and several phones while charging can not be achieved. The light of the foregoing, is presented in-car wireless charger envisaged, will introduce Electromagnetic induction technology to charge fields, through the electro-magnetic, magneto-electric conversion, enabling mobile contactless charging, the core technology of transformer-like non-core processing.

2 Wireless charging

2.1 General block diagram of the programme 

This article presents a vehicle for charging the mobile phone brand new programmes, modules and system hardware diagram shown in Figure 1 and Figure 2, respectively.

2.2 hardware 

automotive cigarette lighter 12V rrA power inverter reverse it into the mains, Induction coil built into the base output terminal of the inverter. Because square spirals without connection part of the adjacent side to 90. There current mutations. Built-in inductive loop circular Helix of RADIUS 5 ∞ l rings.

Mobile phones receive duanyou receiver modules and the original charging circuit. Will receive the Induction coil, Rectifier, filter circuit with PCB technology integrated in the module that is small enough, placed in a mobile phone battery, receiver module output is 5V DC 11 a. Mobile phone battery provides power, so as to complete the Wireless charging function.

3 Wireless charging principles and parameters

3.1 operating principle

Wireless charging due to the Chargers and receivers ask current there is no direct link, coil current, voltage is produced by magnetic coupling, which is essentially a pair of transformer-coupled coils, coil in the magnet-free material, its equivalent circuit diagram as shown in Figure 3:

3.2 inductive electromotive force

, Loop 1 and loop 2 are located at the base and handset receiver module, assuming coil 1 (number of turns ". ) Pass to I-I......sirl current, line without 2 (turns to the ramp of a bridge) magnetic induction can be approximated as: the flux of coil 2 is:

Outlet of induction electromotive force for round 2:

So, simply adjust the two turns of the coil than can also play a role in transformation of wireless transmission, required charging voltage.

3.3 Rectifier filter

Because the receiver module in the Induction coil is AC induction to, in order to meet the requirements of mobile phone charger, must also include rectifier and filter circuit in the receiver module.

4 conclusions

This article uses electromagnetic induction study on wireless technologies for mobile phone chargers. Allows the charger to charge the battery with no current direct links. And charging for several phones in the car while providing service, convenience and economy, if applied to humid environments, such as bathrooms, its security can be revealed.

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