We got power! + other exciting news
This month has been filled with meetings and hands on work. MIITO team has been working on site with both: our manufacturing partner and the German research institute. We have successfully increased the system power and meanwhile continued sourcing the next suppliers and components. Our internal communication channel has been busier than ever with daily reports of development progress. We have been extremely productive and its so exciting to see how things starts to come along.
Here are the main things we have been busy with during the last weeks from both of our development partner
- Tested the inductance of the new coil designs (proposed by the research institute) and the impact of ferrite material options.
- With these new coil designs we were able to increase the system power transfer to 800w. As we have mentioned in our previous updates: it has been a major struggle for us to increasing the amount of power that can be transferred into the disk to heat your liquid. In the past we were able to power up 600w but we felt that the power transfer of 600W meant that the time it took to boil water [one of the benchmarks for product performance] was too long. We are so excited to reach 800w! The tests will continue and we are very positive that in further tests we will be able to increase the power transfer to additional 20% to reach the boiling time for 250ml to less than 2min.
- Based on the outcome of our repeatability tests (start mid of October) we will select the final coil (currently we are running tests with 3 different designs) and modify our power electronics to meet the MIITO custom form factor.
- Selected the final coil wire material
MIITO team giving instructions how to wind the coil:
We have selected a display module- we will use an OLED display panel. An OLED display works without a backlight; thus, it can display deep black levels and can be thinner and lighter than a liquid crystal display (LCD) As well OLED displays consumes lower power than LCD displays and can operate in a broader temperature range. After reviewing multiple suppliers- we have found a good partner that has also worked with well recognized brands. Their quality standards fits MIITO and seems to fit out budget.
MIITO Head of Engineering also visited external certification labs for EMC product certification. At each development milestone we will test MIITO to be sure it meets EMC and safety requirements. Before mass production we will submit the final certification, but it is important to test throughout the development and manufacturing processes as test results could influence necessary modifications to the product and result in updates to the design.
Our research partner has created a tool and an algorithm to simulate thousands of coils and propose only the best fit [to meet our functional requirements]. These “best fit” designs are then reviewed by the development team, and a selection is made to be verified in real life. So far our partner has already simulated more then 10 000 coils for us.
- Three different coil designs with different layers and winding techniques. All three are working in the same frequency range. First these coils were hand wound by the MIITO team and tested together with the manufacturing partner.
- Our research partner have defined the system operation conditions- these are the settings that we need to provide for the software for the power electronics to operate (ex frequency, restrictions for current and voltage etc).
- Additionally, we have sourced three different ferrite materials that were tested together with the new coils in order to find the best performing material in combination with the best coil design. Ferrites are non-conductive ferromagnetic ceramic compounds derived from iron oxides. In our case the ferrite is attached to the coil fixture and its important to choose the right one as this influences the power transfer.
What to expect in the next update:
- Results from repeatability tests
- The final coil will be chosen
- New results on increasing the power transfer
- Form our power electronics into the MIITO shape ( adjust to the circular shape)
- Input the MIITO image files into the display demo board (movies coming up)
Until next time!
Your MIITO team