Timeline for Battery as reference voltage
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
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| Apr 30, 2016 at 19:08 | comment | added | Mishony | @JImDearden: That's actually very smart - I should have thought of that myself :) I think in general that's the right thing to do if you need the precision and have the proper parts. | |
| Apr 30, 2016 at 18:56 | comment | added | JIm Dearden | Why not just combine the two - a small re-chargable battery and a precision voltage reference run from it to get you over those long winter nights. | |
| Apr 30, 2016 at 18:38 | answer | added | rdtsc | timeline score: 0 | |
| Apr 30, 2016 at 18:32 | comment | added | user57037 | In order for this to work well, you will probably want to use a capacitor on the solar panel side, and an inductor, diode and capacitor on the load side. Basically you are going to be designing a hystertic buck converter that maintains Vin at Vpp. The only practical application I can think of for this is a solar battery charger. An interesting idea that can probably be made to work. You will need to work out a way to avoid over-charging the battery. | |
| Apr 30, 2016 at 18:21 | comment | added | Mishony | @mkeith: Actually, this is exactly the effect I am hoping to abuse - by rapidly switching the load on and off I could keep the panel near its "maximum power voltage" region, hopefully squeezing a bit more power in less-than-optimal conditions. Most probably I would be just wasting power, but it is still fun to try and experiment. I could even learn something in the process. But I agree with you - this is another topic, which I intend to post as soon as I've made up my mind enough to ask a meaningful question :) | |
| Apr 30, 2016 at 17:55 | comment | added | user57037 | There are a lot of pitfalls associated with switching a load connected to a solar panel based on voltage. For example, when you disconnect the load, the panel voltage will typically go up by a lot. This may cause your simple comparator to reconnect the load (after some odd microseconds). But reconnecting the load will cause the voltage to drop back down, so your comparator will disconnect again, etc. This is an oscillation, and can be bad or undesireable for lots of reasons. There are various ways to deal with it, but they can't be explained in a comment. | |
| Apr 30, 2016 at 17:46 | answer | added | Nick Alexeev | timeline score: 4 | |
| Apr 30, 2016 at 17:43 | comment | added | Asmyldof | This sounds infinitely much like fixing a problem that doesn't need fixing. When your solar panels output less than 1V, what, exactly, are you turning on/off with the ouput of the comperator? The answer is either: Something powered by something else -> Supply for your reference. Or: Nothing, because there is no power -> Why the hell do you need the comparator then in the first place? | |
| Apr 30, 2016 at 17:21 | history | asked | Mishony | CC BY-SA 3.0 |