Thanks for sharing. Two companies come to mind: Strix for kettle controllers and Shimano for bike gears. Maybe they don't fit exactly to the Hidden champions category because they’re not very hidden from the public (many manufacturers mention their names on final products, assuming consumers might take that into account). So the criteria for “hidden champions” could be more flexible imo
Strix became less hidden for me personally after listening to The Life Scientific interview with John Taylor [1]. There is plenty of fascinating information, probably because Jim Al-Khalili is a great scientific interviewer. Recently, I recalled it in the context of AI, self-driving, and safety. Strix controllers have a second level of protection if the main automatic shut-off circuit fails. That’s probably why we never hear of fires or other incidents due to a failed Strix controller.