to your questions:
a) yes, the coils of the Receiver and Transmitter have to be coupled at a z distance of maximal 10mm as defined in the Qi Standard of the Wireless Power Consortium (WPC). Energy up to 5W will be transferred.
Enotion power Switches operate differently as they only transfer a signal on energy harvesting Basis and not energy.
To cover a distance of 100cm you have to use a different transfer technology like magnetic resonance, RF or IR.
b) Operational energy transfer frequency is at 120kHz, as the Qi Standard defines 100-205kHz as frequency range.
This is published in the Qi Standard of WPC.
c) there is no need for an extra µC as the power Management Controllers of the TI boards can be set according to the parameters of the Qi Standard by the programming Interface of the Evaluation boards or jumpers on the boards. Description on the TI Website you mention in your question a).
You have a great table.
I wonder if you could add the efficiency when the various coils are NOT displaced.
Its very interesting that the 'ebay' electronic receiver performance is not as good, and something a table isn't go to show.
Actually, these number are already there. I just was not clear about them. When looking at the current draw, the lowest value is the one with no displacement. The larger the displacement, the higher the current consumption. So the first number for the current, and therefore the first number of the efficiency, is the one with no displacement.
I will update the articles accordingly, to make that clearer.
Regarding the ebay receiver: with lower loads (and small distances) its efficiency is better. With higher loads it goes to about par. With larger vertical distances it also gets better, also with higher displacement. OTOH its adaptive power management seems not as good, and it needs lower distances to pick up a connection.
What is the range of the WÜRTH " Wireless Power Transfer Solution To Go" solution
It is shipped with
5V, Qi Compliant Wireless Power Transmitter Manager Evaluation Module
BQ51013BEVM-764 WPC 1.1 Compatible Fully Integrated Wireless Power Receiver IC Evaluation Module
Must be transmitter and receiver be together as known from "charging stations",
or might the power transmission work for about 100 cm, like known from Enotion powerswitches ?
My design challenge application needs this distance of 100 cm...
What is the operating RF frequency of the devices ?
I did not find any clues in the TI documents...
I don´t mean the clock speed of of an optional or included microcontroller..
If I see right, there is no microcontroller included in the set?!
If so, do you think that it would be a good idea to add a MSP430 board for controlling the application :-)?! ( I am used to program it ).