Electronics > Beginners
How to add soft-start feature to a PSU?
TheHolyHorse:
--- Quote from: Siwastaja on June 23, 2019, 10:18:26 am ---I jumped in the STM32 world (from 8-bit AVR) by directly designing it in in an actual customer project and promising delivery in one month :-DD. Funny times. In the end, the customer was satisfied despite delays (took two months to have anything work at all), and I learned a lot, but it happened quickly, and with the customer, we designed a proper V2 (using STM32 as well) a year later, with more realistic schedules.
--- End quote ---
Yeah I've only played with some AVR stuff before as well so this will be my first project with the STM32 ;D
exe:
To me stm32 has a huge learning curve (may be because I'm on Linux). But I don't know an alternative that would be that universal. I use Chibios for firmware. I don't use CubeMX because the code and API it generates is absolutely not to my liking. It's fine for led blinking, but when I tried more sophisticated programs I found Chibios much easier to use. Still difficult nonetheless.
BTW, I'm giving esp32+8Mb psram + micropython a chance. But it doesn't have many IO pins, so I'm stuck with SPI displays.
Kleinstein:
The choice of µC is probably the least problem. One difficulty with the STM32 is that they come in really small cases only. Not everybody can solder this, especially on a board with limited quality. One can do something like AVR or PIC18 on a prototype board - the STM32 essentially needs a professional made board with solder mask.
A big problem of the circuit shown is that it starts with a voltage regulator and kind of adds a poor current limit as a an afterthought. This sytems tends to oscillate. For the same reason Dave's 1 st Version of the µ-supply never got finished. Designing a lab supply (combined voltage and current regulation) is not that easy as it sounds. Using a voltage regulator chips usually does not really help - it is more like making things more difficult.
TheHolyHorse:
--- Quote from: Kleinstein on June 23, 2019, 11:15:10 am ---The choice of µC is probably the least problem. One difficulty with the STM32 is that they come in really small cases only. Not everybody can solder this, especially on a board with limited quality. One can do something like AVR or PIC18 on a prototype board - the STM32 essentially needs a professional made board with solder mask.
--- End quote ---
You can get boards from JLC for almost nothing and solder LQFP with 0.5mm pitch.
Arjunan M R:
Then what is the best way to add current limiting?
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