Timeline for MCU 'remote control' of DC-DC converter's Vout adjustment potentiometer
Current License: CC BY-SA 4.0
17 events
| when toggle format | what | by | license | comment | |
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| Feb 27, 2022 at 22:12 | vote | accept | bernd2700 | ||
| Feb 27, 2022 at 22:06 | history | edited | SamGibson♦ |
Rollback to Revision 2 - OP has explained in comments that the answer included as supplemental really was intended as an answer, not a status update.
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| Feb 26, 2022 at 22:16 | history | edited | SamGibson♦ | CC BY-SA 4.0 |
appended answer 610121 as supplemental
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| Feb 26, 2022 at 21:31 | answer | added | bernd2700 | timeline score: 1 | |
| Feb 24, 2022 at 3:54 | comment | added | user57037 | Use a servomotor to turn the screw. | |
| Feb 24, 2022 at 3:33 | answer | added | hacktastical | timeline score: 6 | |
| Feb 24, 2022 at 1:38 | answer | added | user1850479 | timeline score: 3 | |
| Feb 24, 2022 at 0:58 | comment | added | Fred Cailloux | Also, you could ( if common ground ) utilize an FET transistor and a voltage control via DAC ( simple RCRC circuit out of the uController ) The variable resistance of the FET could be utilized as a variable resistor on The DC-DC circuit board. | |
| Feb 24, 2022 at 0:56 | comment | added | Fred Cailloux | Looking at the bottom side of the PCB it looks to me like the adjustable trimpot is connected as a simple variable resistor to ground. Of course that would have to be validated with a multi-meter. If true, then one approach could be an addional circuit composed of , say, 5 little MOSFETs ( BS170 ) each Drain in series with 1 resistors. Then you control those MOSFETs with 5 IO . the uController must be common ground with your DC-DC regulator. If you need galvanic insulation you will need 5 Opto-couplers instead (Faichild H11F1M ) . This would give you 5 preset voltages. | |
| Feb 23, 2022 at 22:44 | comment | added | D.A.S. | If you have a DAC output , inject an offset voltage against the current thru 10k pot at max V using a calculated R to Vfb | |
| Feb 23, 2022 at 22:37 | history | edited | TonyM | CC BY-SA 4.0 |
Clarifications. Spelling and grammar.
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| Feb 23, 2022 at 22:33 | comment | added | GodJihyo | If you're going to control it with a uC you might look at digital pots. | |
| Feb 23, 2022 at 22:27 | comment | added | Justme | Most likely the circuit is not much more complex than what datasheet has. Basically you are looking to solve 2 issues. First is how to remove the trimpot and replace it with four selectable resistances of your liking. Then solve how to select between those resistance values. Too bad relays were discarded already. | |
| Feb 23, 2022 at 22:12 | review | Close votes | |||
| Mar 2, 2022 at 17:06 | |||||
| Feb 23, 2022 at 22:08 | comment | added | D.A.S. | What is the output Vmin,max adjustment range? | |
| Feb 23, 2022 at 21:50 | comment | added | TonyM | Without a circuit diagram, any replies/answers will be just be lists of possible methods for how the regulator might work, not a specific answer for the circuit you actually have. | |
| Feb 23, 2022 at 21:46 | history | asked | bernd2700 | CC BY-SA 4.0 |