General > General Technical Chat
Simple voltage cutoff schematic for solar charger, any tips?
Psi:
--- Quote from: Zero999 on April 18, 2022, 04:11:22 pm ---
--- Quote from: Psi on April 18, 2022, 10:42:50 am ---The more I think about it the more i like the MCU option. That was until I looked at stock levels of sub $1 MCUs at digikey.
--- End quote ---
How many do you need?
--- End quote ---
Not that many. Maybe 1000 a year, but I like to design products using a MCU that digikey/mouser stock at least 30k of, which is getting very hard of late.
I just really hate having to redesign a product every few months to use a new MCU, its starting to get annoying.
thm_w:
Digikey only has stock of ancient MSP430 and Cypress parts, so I think that methodology doesn't work so well anymore, for MCUs at least.
https://lcsc.com/product-detail/ST-Microelectronics_STMicroelectronics-STM32G030F6P6TR_C529330.html
nctnico:
--- Quote from: Psi on April 18, 2022, 09:32:51 pm ---Yeah, i've been looking at options for driving a N-FET low side switch using a comparator with hysteresis. Which is looking like it should work fine and be small enough to fit in the tight space.
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Maybe an NE555 can be used for such a circuit >:D
Zero999:
I was thinking of something like this.
Part of, or all of R1 or R2 can be a thermistor.
It's a crude model so don't take it seriously. CL is the battery, which I know doesn't look like a battery in real life. There's diode to prevent self-discharge, but that's often integrated into the panel.
mikerj:
--- Quote from: Zero999 on April 19, 2022, 12:03:00 pm ---I was thinking of something like this.
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Once it's switched off it wouldn't switch on again during the day if the battery voltage drops, though it would (probably) reset overnight. Maybe that's ok for the OP?
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