Timeline for Powering Raspberry Pi via battery pack and buck converter - how to solve low voltage reboot issues
Current License: CC BY-SA 4.0
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| Oct 19, 2020 at 11:29 | history | edited | Dmitry Grigoryev | CC BY-SA 4.0 |
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| Oct 16, 2020 at 20:40 | vote | accept | g491 | ||
| Oct 13, 2020 at 9:50 | comment | added | Dmitry Grigoryev | @Seamus No, I'm talking about non-isolated buck converters here. Flyback converters actually rarely use ring cores, they typically have shell core transformers. My point was that the inductor should be physically big to support high currents, surface mount inductors typically won't do. | |
| Oct 13, 2020 at 9:47 | comment | added | Dmitry Grigoryev | @g491 It makes no sense to start the Pi on USB then switch to the battery power. Again: 6 fresh AA cells have enough power to start a Pi, provided you pick the right converter. But those batteries will not last long. Check the picture Seamus posted: at 0.5A (typical Pi 4 idle current), even good batteries will be at 1.1V after just 2 hours, which means if you try to reboot or load the CPU 100%, your Pi will hit undervoltage again, and you'll have to replace the batteries to continue. | |
| Oct 13, 2020 at 6:34 | comment | added | g491 | Any thoughts Dmitry or @Seamus on me starting the Pi up with the USB power supply and then unplugging it and letting it continue running on the battery pack but at lower power draw since under my intended usage? I.e. is it safe to switch out power like that? I'd have the battery pack -> converter already plugged into the 5v and ground pins on the GPIO and then just pull out the USB power. Thanks | |
| Oct 13, 2020 at 6:29 | comment | added | g491 | Interesting to know on the model differences - I see what you're saying on raspberrypi.org/documentation/hardware/raspberrypi/power/… | |
| Oct 12, 2020 at 22:12 | comment | added | Seamus |
a converter featuring a ring inductor... are you referring to a flyback type converter?
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| Oct 12, 2020 at 8:21 | history | edited | Dmitry Grigoryev | CC BY-SA 4.0 |
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| Oct 12, 2020 at 8:16 | history | edited | Dmitry Grigoryev | CC BY-SA 4.0 |
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| Oct 12, 2020 at 8:10 | history | answered | Dmitry Grigoryev | CC BY-SA 4.0 |