Timeline for Is it appropriate to model a DC/DC converter as a variable resistance if I have input voltage and current datapoints?
Current License: CC BY-SA 4.0
12 events
| when toggle format | what | by | license | comment | |
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| Mar 5, 2022 at 17:53 | comment | added | needbrainscratched | @ a concerned citizen I made a detailed post today showing my exact issue: electronics.stackexchange.com/questions/610916/… Could you take a look? | |
| Mar 1, 2022 at 19:38 | answer | added | Verbal Kint | timeline score: 4 | |
| Mar 1, 2022 at 19:28 | answer | added | Simon B | timeline score: 0 | |
| Mar 1, 2022 at 18:55 | comment | added | Verbal Kint | The easiest way is to model the dc-dc converter with a constant power load which is a current source whose value is \$i(t)=\frac{P_{out}}{v_{in}(t)}\$. This mimics a converter featuring a negative incremental resistance and an infinite input voltage rejection. \$v_{in}(t)\$ represents the voltage across the current source. | |
| Mar 1, 2022 at 17:55 | comment | added | user57037 | You could model that with a variable resistance, I guess. | |
| Mar 1, 2022 at 17:50 | comment | added | user57037 | To a first approximation, the DC/DC converter is a constant power load, not a resistance. The rule it enforces is Vin * Iin = k where Vin is the input voltage, Iin is the input current, and k is a constant. This ignores transient response, but is reasonably true for DC behavior. | |
| Mar 1, 2022 at 17:07 | comment | added | a concerned citizen | You'll probably need to help the solver, it sounds like convergence problems. Without seeing any schematic, it's impossible to say what/who/where, but you could try to add some small capacitances across the rectifier diodes (series RC snubbers), or across the nodes that have the sharpest transitions. | |
| Mar 1, 2022 at 16:53 | history | edited | TonyM | CC BY-SA 4.0 |
Split up solid block of text.
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| Mar 1, 2022 at 16:34 | comment | added | Andy aka | I think you need to show your circuit. | |
| Mar 1, 2022 at 16:30 | comment | added | needbrainscratched | @Andy aka yes there is a capacitor at the output of rectifier. | |
| Mar 1, 2022 at 16:30 | comment | added | Andy aka | Have you fitted a smoothing capacitor on the output of the rectifier? | |
| Mar 1, 2022 at 16:25 | history | asked | needbrainscratched | CC BY-SA 4.0 |