Laptop battery charging circuit

[Greg81]

Re: Laptop battery charging circuit

Hello,

I have a question to the following:

DCIN/VCC: input voltage from the AC adapter, should be close to AC adapter voltage

Does the input voltage always come from the AC Adapter? Is the charger IC inactive when running from battery? I was trying to understand the input voltage for Quanta FH5 mainboard, there seems to be no connection to the battery rail although in every IC charger datasheet you read about input from battery and in other schematics VCC is connected to the battery input.

[piernov]

Re: Laptop battery charging circuit

Yes indeed, some platforms only have the AC adapter connected to the DCIN/VCC pin of charger IC, and others have the DCIN/VCC pin of the charger IC connected to both battery and AC adapter (through a dual diode).
I don't have a definitive explanation about it.
It makes sense to have the battery connected to it if you still use some features of the charger IC like current sensing on battery only, but at the same time some platforms provide these features on battery only even though the DCIN/VCC pin is not connected to the battery. So I assume they take the power internally from the battery rail.

[Gomez2969]

Re: Laptop battery charging circuit

Thanks so mush

[lappyfixer]

Re: Laptop battery charging circuit

thank you for the detailed post piernov, exactly what ive been searching for...

[Weelcup]

Re: Laptop battery charging circuit

Thanks a lot

[fabio fanesi]

Re: Laptop battery charging circuit

Thank you so much for the precious informations!!

[emirich]

Re: Laptop battery charging circuit

Thanks

[antunes.jrca]

Re: Laptop battery charging circuit

Thanks for this very good topic.

[Cuboy]

Re: Laptop battery charging circuit

Thank you for the post.

[lazaro.089]

Re: Laptop battery charging circuit

Thank you @Piernov!

I have a question. I have 2 identical laptops (HP Pavilion Gaming Laptop 15-dk011la)

1 does charge the other doesn't. Both batteries charge in one laptop. Both adapters are recognized in both laptops.

But one of them refuses to charge the battery. What should I check first?. The battery is detected correctly in the laptop that doesn't charge (powercfg /batteryreport OK). It discharges just fine. But charging doesn't work.

Aný ideas?

[FaissalDZ]

Re: Laptop battery charging circuit

Very helpful information, thanks

[fauzanmint]

Re: Laptop battery charging circuit

Thank You

[crowntoy99]

Re: Laptop battery charging circuit

Good job bro

[mitu_sharma]

Re: Laptop battery charging circuit

great job thanks for sharing

[ghalli]

Re: Laptop battery charging circuit

Thanks
very good informations

[laptopservice]

Re: Laptop battery charging circuit

thanks

[vesponescassato]

Re: Laptop battery charging circuit

Thank you piernov. This helped me a lot understanding how those circuits work!

[Fr4gz0n3]

Re: Laptop battery charging circuit

Thank you. I helped me a lot.

[rediii]

Re: Laptop battery charging circuit

well done, love it

[manuel.it.solution]

Re: Laptop battery charging circuit

Thanks so much