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Conversion of resistance based Adjustable Switching Power Supply to PWM based
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gnvrvikram:
I have a switching mode power supply and it can be adjusted from 0 to 12 V DC by adjustable pot. Now I want to control using PWM signals from Arduino. Please let me know how to do that. What are the necessary changes that I need to do for the switching mode power supply for this?

The link for the product is: https://www.amazon.in/gp/product/B07MPPTMLY/ref=ox_sc_act_title_3?smid=A1Z1J4ZDNUBVP8&psc=1
Zero999:
My advice is don't. This power supply isn't suitable for controlling with PWM or an external voltage signal. If you can get hold of a schematic for it or reverse engineer it, then you stand a change, but I suspect if you could do that, you wouldn't be asking this question, in this manner.

Get a power supply which a digital or analogue remote control capability. There's one where I work, but I don't have the make and model number to hand. If you reply to this thread, I'll have a look on Monday.
gnvrvikram:
Please let me know if you can get the details.
My thought is that pot there is serving the purpose of the voltage divider, if not wrong. If not PWM, if I can get the maximum voltage between the terminals of the POT, I think I can use the analogue voltage output of the arduino. Why I am asking the question is that I do not want to damage this power supply. If I want to buy a new one that can be controlled with PWM, in this current range, the cost is going to be too high about 6-7 fold increase. Please suggest any alternate low cost solution.
iMo:
The first step in your effort would be to get the schematics of your power source unit..
T3sl4co1l:
Assuming it is a voltage divider referenced to output or to Vref, it should be a simple matter of setting it to a mid-range value (this depends on which type was used, and whether there are other resistors around it setting the range), and tying a resistor from the wiper or error amp input, to a DAC's output, which is programmed by Arduino.  The DAC can be a filtered PWM channel.

Again, this requires knowing what the circuit is.  If it's completely different, this may not be possible.

Tim
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