There are a few in this domain already the standard of establish. Nevertheless, a lot of application do not need any standards. Accordingly, can use the power that optimizes individually to transmit. Graph 1 show gave power of type of a kind of induction to transmit a concept, rely on two coil closely together, alternating current generates in the meeting in former edge coil, like be in transformer, traverse the magnetic field of generation, n/ele be induced by in deputy edge coil alternating current.

 

Graph 1. The inductive type power that has former margin control and receiver transmits a concept.

 

In principle, former edge transmitter can use to simple oscillator is built with a few schism component compose and be become, this is other to low power level transmitting is very effective. To higher power, the LTC4125 that should use ADI of a such as compositive change transmitter circuit. Transmitter adjusts accurately given syntonic frequency. This makes can use specific component to come true most high-power is transmitted.

 

LTC4125 still can detect the eyewinker on former edge coil. For example, a metal relies on if closely on coil, can form eddy current in this metal. They make this metal warms up (be in especially the circumstance) of high power, can bring about personnel to get hurt. In low power level, the eyewinker can be caused only extremely faint calorific, can not produce significant risk. LTC4125 can detect metallic object, reduce power next or interrupt power to transmit. To save electric energy, LTC4125 can ask to adjust according to the power of deputy edge deliver power.

 

Graph 2 showed what adopt specific package to demonstrate circuit example. What does the meeting when this graphic representation went out to be measured when the existence is specific deflection between two coil or interval produce. In transformer, coupling coefficient uprights normally at 0.95 and 1 between. In wireless power transmission system, 0.8 to the coupling coefficient of 0.05 it is very common. In the graph 2 in, coil deflection (unit: Millimeter) show at X axis. The interval between two coil showed on Y axis (also be unit) with millimeter.

 

Accordingly, fill electric power to the batteries of 1W, if two coil are complete perpendicular alignment (for instance, coil deflection is 0) , criterion the removed distance of two coil can be 12mm most. Power is higher, two coil must be stood by more and aim accurately. The choice that can send power to be able to carry circuit element undertakes adjustment. However, what the relation between coil deflection and coil interval will show with the place in the exemple is similar.

 

Graph 2. The deflection between two coil and the effect that removed place produces.

 

To more the wireless power of Sunday run is transmitted, can use RF power to transmit. The job is in ISM frequency paragraph test device. Nevertheless, the photograph of method of inductive type coupling that narrates with here is compared, their can send power wants with transmission efficiency low much.