13 ms·

It's the same as right now. We have 100W (so 20V at 5A), we will have 240W (48V at 5A). Gauge doesn't change, since current stays the same

xani_ 4y ago
Well, except none of the cables or connectors of them was designed for 48V
- boltzmann-brain 4y ago
  That's not true, a lot of the connectors just-so-happen to be rated for mains levels. This is because often USB chargers aren't ground referenced, so they hover at a little above 1/2 mains voltage. This is why if you touch some chargers or devices that are charging you get this weird electrical "sensation" sometimes.
  - megous 4y ago
    They are galvanically isolated. If you're getting any sensation at all, something is clearly wrong.
    - boltzmann-brain 4y ago
      No, they're not. Two-prong power supplies need to have EMI suppression capacitors which connect the secondary side of the power supply's transformer to mains [1]. The mains voltage is present on the output, but the maximum current is low enough that it is safe. It is considered not an issue by manufacturers [2] and it is a fact of many practical power supply designs. Please have any idea what you're talking about before you throw around technical terms like "galvanically isolated". You're clearly not an EE. [1] https://electronics.stackexchange.com/questions/478607/feeling-a-tingling-sensation-by-touching-stuff-is-this-safe https://electronics.stackexchange.com/questions/478607/feeli... [2] https://www.dell.com/en-us/blog/notebook-tingle-sensation-what-39-s-going-on/ https://www.dell.com/en-us/blog/notebook-tingle-sensation-wh...
      - xani_ 4y ago
        Being connected via 2 caps is considered "galvanically isolated" If you're feeling "tingling sensation" your protection caps are fucked Mr. EE
        boltzmann-brain 4y ago
        Galvanic isolation means "no current is allowed from primary to secondary side". This is true of capacitors... but only in theory. Real life capacitors have leakage resistance and therefore do not, in practice, form full galvanic isolation.
      - megous 4y ago
        Capacitive coupling still counts as galvanically isolated. Dielectric resistance of typical Y caps is in GOhm range, so that's basically galvanically isolated, unless you're some kind of purist. You certainly will not be able to feel that. Reactance of a typical Y capcaitor at 50Hz is in the range of single unit MOhm so even that does not cross perception thresholds of most individuals even at 230 V. But it may for some, I guess.
      - megous 4y ago
        Also what the heck with the first link. Apliances with metal enclosure must be grounded. That guy has no business having 50V against ground on the metal enclosure.
    - deleted 4y ago
      [deleted]

xani_ 4y ago

Well, except none of the cables or connectors of them was designed for 48V

boltzmann-brain 4y ago
That's not true, a lot of the connectors just-so-happen to be rated for mains levels. This is because often USB chargers aren't ground referenced, so they hover at a little above 1/2 mains voltage. This is why if you touch some chargers or devices that are charging you get this weird electrical "sensation" sometimes.
- megous 4y ago
  They are galvanically isolated. If you're getting any sensation at all, something is clearly wrong.
  - boltzmann-brain 4y ago
    No, they're not. Two-prong power supplies need to have EMI suppression capacitors which connect the secondary side of the power supply's transformer to mains [1]. The mains voltage is present on the output, but the maximum current is low enough that it is safe. It is considered not an issue by manufacturers [2] and it is a fact of many practical power supply designs. Please have any idea what you're talking about before you throw around technical terms like "galvanically isolated". You're clearly not an EE. [1] https://electronics.stackexchange.com/questions/478607/feeling-a-tingling-sensation-by-touching-stuff-is-this-safe https://electronics.stackexchange.com/questions/478607/feeli... [2] https://www.dell.com/en-us/blog/notebook-tingle-sensation-what-39-s-going-on/ https://www.dell.com/en-us/blog/notebook-tingle-sensation-wh...
    - xani_ 4y ago
      Being connected via 2 caps is considered "galvanically isolated" If you're feeling "tingling sensation" your protection caps are fucked Mr. EE
      - boltzmann-brain 4y ago
        Galvanic isolation means "no current is allowed from primary to secondary side". This is true of capacitors... but only in theory. Real life capacitors have leakage resistance and therefore do not, in practice, form full galvanic isolation.
    - megous 4y ago
      Capacitive coupling still counts as galvanically isolated. Dielectric resistance of typical Y caps is in GOhm range, so that's basically galvanically isolated, unless you're some kind of purist. You certainly will not be able to feel that. Reactance of a typical Y capcaitor at 50Hz is in the range of single unit MOhm so even that does not cross perception thresholds of most individuals even at 230 V. But it may for some, I guess.
    - megous 4y ago
      Also what the heck with the first link. Apliances with metal enclosure must be grounded. That guy has no business having 50V against ground on the metal enclosure.
  - deleted 4y ago
    [deleted]