As a matter of fact, I don't think those inductors form the filter everyone thinks they do. There is no way you can drag 10 amps through those and not have them pop.Hahaha. Apparently, they make their drawing available.
I would've thought the inductors were bigger.
That was my thought too.As a matter of fact, I don't think those inductors form the filter everyone thinks they do. There is no way you can drag 10 amps through those and not have them pop.
As far as the bigger L4, it is out of the way and connected to an LM2574 simple switcher regulator. Nothing to do with an LC filter for the peltiers.
This is a capacitor only board I believe.
That is a very good question.That was my thought too.
I wonder if that board can be programmed for Vmax limiting.
I wasn't talkng about on/off control but about high speed delta-sigma modulation.PaulEE said:...
However, I also agree that it can be done with on/off control, but the equivalent switching frequency would end up being the same as my pulse-width modulation signal!
I'll have to look into this. I did look at whether Vmax limiting was present on the controller...and it seems that it is up to the user to supply only the Vmax that is needed. I think Ron_H inquired about that a day or so ago.They just use unfiltered PWM to the peltier device like most manufacturers, you only need filtered PWM if it is less than about 4kHz to reduce thermal cycling shock.
I wasn't talkng about on/off control but about high speed delta-sigma modulation.
Basically the same result as PWM (and similar high frequency output) but not limited to a low resolution, and the resolution is fully under your control, so if you need resolution of 1 million, or 10 million etc its up to you and just needs changing one constant in your code.
You can have a very high resolution power adjustment to the heater load (which makes the precision temperature PID so much easier).
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