Timeline for Is it possible to *proportionally* reduce a DC voltage supply?
Current License: CC BY-SA 3.0
15 events
| when toggle format | what | by | license | comment | |
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| Oct 15, 2016 at 19:58 | vote | accept | boardbite | ||
| Aug 9, 2016 at 7:46 | comment | added | winny | @boardbite If you are only driving a DC motor you may get away with it anyway. Didn't see the schematic yesterday. If you wanted a true DC output, DCM vs. CCM would be a real problem for you with fixed PWM. | |
| Aug 9, 2016 at 1:50 | comment | added | boardbite | @Brian: Started looking into PWM and added an EDIT to my question text above. | |
| Aug 9, 2016 at 1:49 | history | edited | boardbite | CC BY-SA 3.0 |
added 106 characters in body
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| Aug 9, 2016 at 1:35 | comment | added | boardbite | @winny: Based on a quick google search, "continuous conduction mode" means "the current in the energy transfer inductor never goes to zero between switching cycles". I didn't understand exactly how that figures into my application... I'm certainly interested in a simple solution (a bit new to circuitry) and if PWM is that, I'd like to try it out -- can you perhaps make an answer describing this implementation further? I'm not familiar with PWM besides using it via software on a PWM-capable pin on a microcontroller. | |
| Aug 8, 2016 at 16:31 | answer | added | Claudio Avi Chami | timeline score: 1 | |
| Aug 8, 2016 at 15:38 | comment | added | winny | @BrianDrummond Keep in mind that that requires continuous conduction mode. As long as you have that in all load conditions, fixed PWM is the fast and easy solution. | |
| Aug 8, 2016 at 13:14 | comment | added | boardbite | @Brian: Yep, that is what I am trying to achieve. | |
| Aug 8, 2016 at 13:13 | answer | added | Spehro 'speff' Pefhany | timeline score: 2 | |
| Aug 8, 2016 at 13:11 | comment | added | user16324 | Sounds like you want PWM with a fixed duty cycle of 5/24. | |
| Aug 8, 2016 at 13:06 | comment | added | Ignacio Vazquez-Abrams | ... Use a voltage divider for the reference voltage. You may not be able to use a COTS regulator, but it can definitely be done. | |
| Aug 8, 2016 at 13:05 | comment | added | Vladimir Cravero | you could use some sort of reversed charge pump. that would be fun | |
| Aug 8, 2016 at 13:05 | comment | added | boardbite | I meant because a regulator (at least typically?) would output a fixed voltage, as opposed to something continuously proportional to the varying input voltage. | |
| Aug 8, 2016 at 13:03 | comment | added | Ignacio Vazquez-Abrams | "Regulators are out for obvious reasons" Why? Because the current draw would appear to be too high? That's why switching regulators and MOSFETs are used for this. | |
| Aug 8, 2016 at 12:59 | history | asked | boardbite | CC BY-SA 3.0 |