November update: Misplacemenet tests, PCB, EMC
Winter has arrived, the tea season has started and we are hurrying to deliver you that amazing tea maker that we all are dreaming off. This month we have continued our momentum and striving towards next milestones. As usual - the development is happening in multiple locations and dedicated teams are dealing with separate tasks. This will be a busy winter with most of the days spent on manufacturers sites. We are so lucky that our development team is willing to spend their days away from home to maintain the momentum. We have a strict timeline as we plan to reach a production ready “works like- looks like” prototype until February and we are so excited to literally see things coming together and taking MIITO shape.
As we mentioned in numerous updates before, we had been struggling with the power to be transferred for a long time. The bottle neck used to be the coil (you probably all remember!). But we have solved that issue: now we can proudly say: We have mastered that challenge and reached our goal! We have tested the performance with different volumes and under different circumstances and the results we are getting are both constant and reliable showing a stable performance without the coil overheating.
Cup misplacement tests
Currently we are running a new set of tests noting down the changes in the system depending on how the cup is placed on the MIITO base. The coil is hiding in the center of MIITO base and here the magnetic field is the most efficient. But what happens if by accident you put your cup not in the middle but on the side of MIITO? Exactly this is what we are now testing but so far it look like the system is still efficiently working. Interesting that tilting the rod makes a way bigger difference in efficiency tests than the misplacement of the cup. We haven’t finished these tests but we can already advice that your rod should be placed in the cup correctly (the metal disk should be parallel to the base) in order to boil your water fast:)
Coil + Ferrite tests
All the tests mentioned above are done with 3 different custom-designed coils. As we mentioned in previous updates- we are very proud of the current designs and now we have to choose the best construction and suitable ferrites to accompany it. Thanks to the work done by our research partners in Germany, we now are running the tests with custom made ferrites that has the accurate mechanical dimensions and are provided by our manufacturing partners.
We have received new simulations that show the magnetic field distribution around the coil and information about the performance of the ferrite during operation. They have also helped us by running theoretical tests on the cup misplacement and tilting the rod, but now we are replicating these tests with real life situations as described earlier.
Meanwhile our manufacturing partner has made a huge step forward and have delivered our first version of PCBA for the main board and for the UI board. They have drawn the schematics, the layout, printed the board and placed the components on it. Now they are running tests to verifying that all components are working simultaneously and fulfilling their functions. We also have the first version of the UI board and we were excited to see the little screen saying Hello and the capacitive touch slider working for the temperature setting.
Before Christmas we plan to run our first EMC test. Then depending on the results we will have to redo the board, test it again and then put everything into the MIITO enclosure. We have chosen 2 partners for the preliminary tests and picked them because of their willingness to step in and help us to figure out solutions to problems. We will run the tests in both locations to get maximum input. We expect that there will be some challenges to be able to comply with the standards. The high power of MIITO makes us have more noise in the system and therefore we have to seek for protections against possible issues caused by the magnetic field. We are making sure that during this phase professionals from this field surround us and luckily our Head of Engineering has loads of experienced when it comes to dealing with EMC. She already has established the testing and verification strategy to be efficient during our EMC and safety tests.
That's it for now. Time to go back to work and we will share our next achievements in December!
Greetings from the Team