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Groups > alt.comp.hardware.pc-homebuilt > #43923
| From | Paul <nospam@needed.invalid> |
|---|---|
| Newsgroups | alt.comp.hardware.pc-homebuilt, alt.comp.os.windows-10, sci.electronics.repair |
| Subject | Re: How do I find a power adapter spec for an old Hyundai laptop? |
| Date | 2025-05-04 14:51 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <vv8cuv$2k0fq$1@dont-email.me> (permalink) |
| References | (1 earlier) <vv17e6$3u7u9$1@dont-email.me> <vv6156$2rkhq$1@paganini.bofh.team> <vv63t6$fts8$1@dont-email.me> <vv666t$i3gn$1@dont-email.me> <6817ae85$0$22$882e4bbb@reader.netnews.com> |
Cross-posted to 3 groups.
On Sun, 5/4/2025 2:14 PM, Mark Lloyd wrote: > On Sun, 4 May 2025 00:43:41 +0200, Ivano Rossi wrote: > >> On Sat, 3 May 2025 17:04:01 -0500, Paul in Houston TX wrote: >> >>>>> Google: Hyundai laptop power supply >>>>> >>>>> 12V, 2A >>>> >>>> That will only work if the company makes only one laptop power supply. >>>> Does it? >>> >>> IDK. However, if you search the internet, including the Hyundai >>> website, you will only find the 12V, 2A or 3A models. >> >> Isn't 12 volts far too low for any modern laptop power supply? >> Aren't they usually around 20 volts? > > The only recent laptop I've had that used 12V was the Asus netbook. > You can do VCore power conversion, off the +5V rail. I have an AthlonXP board (A7N8X), where there was no ATX12V connector, and the current came in through the ATX 20 pin main connector. Cylindrical input inductor and three caps on the 5V side. Two iron core toriods on the output side and five electrolytics. Four MOSFETs, a pair per phase, knuckle draggers with high gate capacitance. You don't run these on modern power supplies, you go to the junk room and find one with a "strong" 5V output. While gaming, the +5V consumption was high enough, it would cause most modern PSU to shut off :-) https://images.anandtech.com/reviews/motherboards/roundups/2002/Q4/nForce2/asus/board.jpg Four wires on the 20 pin connector, carried the current (13 amps plus). There was a Richtek 50KHz converter, and there were some "beefy" MOSFETs on there. And somehow, there was enough gate swing, to turn those MOSFETs fully on and fully off. And that powered a 65W processor. Normally, an estimate of a "good" power rating for a phase on VCore, is a target of 30-35 watts, so from an estimation perspective, you would expect to find two phases on such a design (for 65W). The board designs switched to ATX12V right after that, and suddenly RichTek wasn't the only game in town. Most power converters (SMPS) have run at higher frequencies than 50KHz. The record holder, is the Haswell FIVR inside the CPU package, running its power converter at 200MHz. Nobody else has some close to being that bold, since. The designs today, are rather cheesy. There are some "favored" MOSFETs for PC design. You use a shitload of those, for no particular reason. Some of the designs run hot. On the Asus side, they did a multi-phase design, where they had *three* banks in parallel. That's three phases with exactly the same timing and firing point, and the currents from them add. That wouldn't be necessary, if you spent a buck or two more on a better MOSFET. But I have to admit, I'm impressed with the temperature rise that gives. Lukewarm when flat out at 200 Watts. There is as much heat coming from resistive loss in the PCB, as in the MOSFETs! There is likely more VCore ripple on those boards, but there is no sign of instability that I can see. For that board, an electrical type set up a go-fund-me, to buy a small multi-channel scope, so he could take pictures of the phase firing order, and prove what they were doing :-) Which is also a cool aspect of our current time. Donation-ware reverse engineering. Paul
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How do I find a power adapter spec for an old Hyundai laptop? Umberto <canaliumberto@impresatrecolli.com> - 2025-05-01 13:38 -0500
Re: How do I find a power adapter spec for an old Hyundai laptop? Paul in Houston TX <Paul@Houston.Texas> - 2025-05-01 20:33 -0500
Re: How do I find a power adapter spec for an old Hyundai laptop? Randy Jones <randolphJones@randyjones.com> - 2025-05-03 23:17 +0200
Re: How do I find a power adapter spec for an old Hyundai laptop? Paul in Houston TX <Paul@Houston.Texas> - 2025-05-03 17:04 -0500
Re: How do I find a power adapter spec for an old Hyundai laptop? Ivano Rossi <Ivano.Rossi@nospam.tin.it> - 2025-05-04 00:43 +0200
Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-03 21:12 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? Paul in Houston TX <Paul@Houston.Texas> - 2025-05-04 00:31 -0500
Re: How do I find a power adapter spec for an old Hyundai laptop? Mark Lloyd <not.email@all.invalid> - 2025-05-04 18:14 +0000
Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-04 14:51 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? Umberto <canaliumberto@impresatrecolli.com> - 2025-05-07 01:35 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? knuttle <keith_nuttle@yahoo.com> - 2025-05-07 07:33 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-07 15:16 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? Uncle Bob <uncle.bob@nospam.net> - 2025-05-07 18:07 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? knuttle <keith_nuttle@yahoo.com> - 2025-05-07 19:55 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? david <this@is.invalid> - 2025-05-08 05:27 -0600
Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-07 21:58 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? Larry Wolff <larrywolff@larrywolff.net> - 2025-05-08 07:21 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-08 09:08 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? Theo <theom+news@chiark.greenend.org.uk> - 2025-05-08 11:06 +0100
Re: How do I find a power adapter spec for an old Hyundai laptop? Peter <confused@nospam.net> - 2025-05-08 12:15 +0100
Re: How do I find a power adapter spec for an old Hyundai laptop? Theo <theom+news@chiark.greenend.org.uk> - 2025-05-08 12:42 +0100
Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-08 09:18 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? Paul in Houston TX <Paul@Houston.Texas> - 2025-05-07 22:08 -0500
Re: How do I find a power adapter spec for an old Hyundai laptop? micky <NONONOmisc07@fmguy.com> - 2025-05-08 01:13 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-08 08:28 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? micky <NONONOmisc07@fmguy.com> - 2025-05-08 01:10 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-08 09:42 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? Theo <theom+news@chiark.greenend.org.uk> - 2025-05-11 08:33 +0100
Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-01 21:37 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? Frank Slootweg <this@ddress.is.invalid> - 2025-05-03 12:33 +0000
Re: How do I find a power adapter spec for an old Hyundai laptop? "...winston" <winstonmvp@gmail.com> - 2025-05-01 23:52 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? micky <NONONOmisc07@fmguy.com> - 2025-05-02 01:56 -0400
Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-02 13:57 -0400
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