https://i.stack.imgur.com/YaRcd.png How it's wired. With my wiring, the USB wires are heating up to around 200-300F. Am I using the right voltage? Is the iPad demanding too much power? The PSU worked fine after the incident.
Wires overheated while charging iPad with ATX PSU
Started by ●February 21, 2022
Reply by ●February 21, 20222022-02-21
On Monday, February 21, 2022 at 8:31:16 PM UTC-5, s7382 wrote:> https://i.stack.imgur.com/YaRcd.png > How it's wired. With my wiring, the USB wires are heating up to around 200-300F. > Am I using the right voltage? > Is the iPad demanding too much power? The PSU worked fine after the incident.Remember, D+ and D- are shorted to show the port is a dedicated charging port (DCP).
Reply by ●February 21, 20222022-02-21
On 22-Feb-22 12:31 pm, s7382 wrote:> https://i.stack.imgur.com/YaRcd.png > How it's wired. With my wiring, the USB wires are heating up to around 200-300F. > Am I using the right voltage? > Is the iPad demanding too much power? The PSU worked fine after the incident.I expect the iPad can draw a fair amount of current, and the ATX PS could certainly supply it. How thick are the conductors? Sylvia.
Reply by ●February 22, 20222022-02-22
On Tue, 22 Feb 2022 14:30:00 +1100, Sylvia Else <sylvia@email.invalid> wrote:>On 22-Feb-22 12:31 pm, s7382 wrote: >> https://i.stack.imgur.com/YaRcd.png >> How it's wired. With my wiring, the USB wires are heating up to around 200-300F. >> Am I using the right voltage? >> Is the iPad demanding too much power? The PSU worked fine after the incident. > >I expect the iPad can draw a fair amount of current, and the ATX PS >could certainly supply it. How thick are the conductors? > >Sylvia.I wonder what the actual voltage is. -- I yam what I yam - Popeye
Reply by ●February 22, 20222022-02-22
On 22-Feb-22 3:04 pm, jlarkin@highlandsniptechnology.com wrote:> On Tue, 22 Feb 2022 14:30:00 +1100, Sylvia Else <sylvia@email.invalid> > wrote: > >> On 22-Feb-22 12:31 pm, s7382 wrote: >>> https://i.stack.imgur.com/YaRcd.png >>> How it's wired. With my wiring, the USB wires are heating up to around 200-300F. >>> Am I using the right voltage? >>> Is the iPad demanding too much power? The PSU worked fine after the incident. >> >> I expect the iPad can draw a fair amount of current, and the ATX PS >> could certainly supply it. How thick are the conductors? >> >> Sylvia. > > I wonder what the actual voltage is. > > >Presumably 5V, unless you're thinking that it's drawing too little current for the ATX PS to be stable. Sylvia.
Reply by ●February 22, 20222022-02-22
On Tue, 22 Feb 2022 19:43:32 +1100, Sylvia Else <sylvia@email.invalid> wrote:>On 22-Feb-22 3:04 pm, jlarkin@highlandsniptechnology.com wrote: >> On Tue, 22 Feb 2022 14:30:00 +1100, Sylvia Else <sylvia@email.invalid> >> wrote: >> >>> On 22-Feb-22 12:31 pm, s7382 wrote: >>>> https://i.stack.imgur.com/YaRcd.png >>>> How it's wired. With my wiring, the USB wires are heating up to around 200-300F. >>>> Am I using the right voltage? >>>> Is the iPad demanding too much power? The PSU worked fine after the incident. >>> >>> I expect the iPad can draw a fair amount of current, and the ATX PS >>> could certainly supply it. How thick are the conductors? >>> >>> Sylvia. >> >> I wonder what the actual voltage is. >> >> >> > >Presumably 5V, unless you're thinking that it's drawing too little >current for the ATX PS to be stable. > >Sylvia.Some "USB" (irony emphasis on the U) cables are specifically resistive, to limit current. I'd expect that an ATX switching supply might make a lot of voltage with a light load. OP could measure both. -- If a man will begin with certainties, he shall end with doubts, but if he will be content to begin with doubts he shall end in certainties. Francis Bacon
Reply by ●February 22, 20222022-02-22
tirsdag den 22. februar 2022 kl. 20.30.01 UTC+1 skrev John Larkin:> On Tue, 22 Feb 2022 19:43:32 +1100, Sylvia Else <syl...@email.invalid> > wrote: > > >On 22-Feb-22 3:04 pm, jla...@highlandsniptechnology.com wrote: > >> On Tue, 22 Feb 2022 14:30:00 +1100, Sylvia Else <syl...@email.invalid> > >> wrote: > >> > >>> On 22-Feb-22 12:31 pm, s7382 wrote: > >>>> https://i.stack.imgur.com/YaRcd.png > >>>> How it's wired. With my wiring, the USB wires are heating up to around 200-300F. > >>>> Am I using the right voltage? > >>>> Is the iPad demanding too much power? The PSU worked fine after the incident. > >>> > >>> I expect the iPad can draw a fair amount of current, and the ATX PS > >>> could certainly supply it. How thick are the conductors? > >>> > >>> Sylvia. > >> > >> I wonder what the actual voltage is. > >> > >> > >> > > > >Presumably 5V, unless you're thinking that it's drawing too little > >current for the ATX PS to be stable. > > > >Sylvia. > Some "USB" (irony emphasis on the U) cables are specifically > resistive, to limit current.examples? can't see any reason to a USB cable being resistive other and as a side effect of trying save money on copper
Reply by ●February 22, 20222022-02-22
On 2/21/2022 6:31 PM, s7382 wrote:> https://i.stack.imgur.com/YaRcd.png > How it's wired. With my wiring, the USB wires are heating up to around 200-300F. > Am I using the right voltage?A VOM seems like the easiest way to VERIFY that. You may find the PSU requires a heavier load on the supply than you are providing. Putting an ammeter in series with the load to give you a rough idea of the amount of current flowing would be a good idea. Likewise, the voltage DROP across the cable's length.> Is the iPad demanding too much power? The PSU worked fine after the incident.iPad get warm (battery)? If you disconnect iPad from your "adapter", there should be NO current flowing and no "heat", right? (i.e., wiring error)
Reply by ●February 22, 20222022-02-22
On Tue, 22 Feb 2022 11:44:13 -0800 (PST), Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:>tirsdag den 22. februar 2022 kl. 20.30.01 UTC+1 skrev John Larkin: >> On Tue, 22 Feb 2022 19:43:32 +1100, Sylvia Else <syl...@email.invalid> >> wrote: >> >> >On 22-Feb-22 3:04 pm, jla...@highlandsniptechnology.com wrote: >> >> On Tue, 22 Feb 2022 14:30:00 +1100, Sylvia Else <syl...@email.invalid> >> >> wrote: >> >> >> >>> On 22-Feb-22 12:31 pm, s7382 wrote: >> >>>> https://i.stack.imgur.com/YaRcd.png >> >>>> How it's wired. With my wiring, the USB wires are heating up to around 200-300F. >> >>>> Am I using the right voltage? >> >>>> Is the iPad demanding too much power? The PSU worked fine after the incident. >> >>> >> >>> I expect the iPad can draw a fair amount of current, and the ATX PS >> >>> could certainly supply it. How thick are the conductors? >> >>> >> >>> Sylvia. >> >> >> >> I wonder what the actual voltage is. >> >> >> >> >> >> >> > >> >Presumably 5V, unless you're thinking that it's drawing too little >> >current for the ATX PS to be stable. >> > >> >Sylvia. >> Some "USB" (irony emphasis on the U) cables are specifically >> resistive, to limit current. > >examples? > >can't see any reason to a USB cable being resistive other and as >a side effect of trying save money on copperI've seen gadgets that come with a specifically resistive USB power cable and warnings to use only that one. I don't have a link. -- If a man will begin with certainties, he shall end with doubts, but if he will be content to begin with doubts he shall end in certainties. Francis Bacon
Reply by ●February 22, 20222022-02-22
On Tue, 22 Feb 2022 13:20:37 -0700, Don Y <blockedofcourse@foo.invalid> wrote:>On 2/21/2022 6:31 PM, s7382 wrote: >> https://i.stack.imgur.com/YaRcd.png >> How it's wired. With my wiring, the USB wires are heating up to around 200-300F. >> Am I using the right voltage? > >A VOM seems like the easiest way to VERIFY that. > >You may find the PSU requires a heavier load on the supply than you are >providing. > >Putting an ammeter in series with the load to give you a rough idea of >the amount of current flowing would be a good idea. Likewise, the voltage >DROP across the cable's length. > >> Is the iPad demanding too much power? The PSU worked fine after the incident. > >iPad get warm (battery)? > >If you disconnect iPad from your "adapter", there should be NO current flowing >and no "heat", right? (i.e., wiring error)Seems like a good way to destroy the ipad. -- If a man will begin with certainties, he shall end with doubts, but if he will be content to begin with doubts he shall end in certainties. Francis Bacon
