Since I already expected an increased temperature development of the heatsink for the MOSFETs, the side covers got one 80mm fan each to ensure at least a little airflow inside. When the hardware was completely finished, the measuring technique looked like this (a boxed cooler sits on top, because you can’t run the system completely without cooling:
The software
The microcontroller is quite easy to program in C with common means. I programmed 100 Hertz as PWM switching frequency and followed Igor’s template, so that there are ten power levels to be set by turning the potentiometer. The programmed PWM duty cycles can be set in the software from 0-255 at any time, so that future or even exotic TDP values can be implemented without having to change the hardware.
That was actually already the whole magic, the software for the measuring station covers just barely two pages. Alternatively, the set power level, the temperature and the current values can also be output via serial monitor on the PC. This is very practical, also for logging.
Summary
As a conclusion I would like to say: It was an interesting excursion, also into the production technology concerning metals. Nevertheless, I now know exactly why I prefer to lay out 8-layer boards with thousands of airwires rather than cutting a single thread: I just don’t like it. For future versions of the metrology I have now already some basic improvements in mind and it was as always an honor and pleasure to help my friend Igor. Projects like this always feel less like work and more like: doing cool projects with cool people.
33 Antworten
Kommentar
Lade neue Kommentare
Urgestein
Urgestein
1
Urgestein
Urgestein
Urgestein
1
Veteran
1
Veteran
Urgestein
Mitglied
Mitglied
Mitglied
Urgestein
Urgestein
Urgestein
Mitglied
Alle Kommentare lesen unter igor´sLAB Community →