My original laptop power supply has a 3-prong AC plug (with a ground pin). I have a new power supply with the same power specs which has a 2-prong AC plug (no ground pin). The ground pin on the original plug is directly connected to the negative terminal of the DC power plug that plugs into the computer (tested with ohm meter). I have tried the ungrounded power supply with the laptop and it works fine as far as I can tell. All the desktop computer power supplies I've checked have the earth ground connected through to the common wires. An old laptop power supply I checked has an earth ground pin, but it is not connected through to the DC power plug. Apparently some laptops are supplied with ungrounded power supplies.
Here are my questions:
1. Is there any problem with operating my laptop with the ungrounded power supply?
2. Is the common (or ground) inside the computer connected to earth ground or is it isolated internally?
3. I built a bench power supply from a desktop computer power supply. The common (or ground terminal) on the power supply is connected to earth ground. Are there any potential problems with that? Most DC power supplies seem to have the DC ground isolated from earth ground.
Thanks,
Jack
Here are my questions:
1. Is there any problem with operating my laptop with the ungrounded power supply?
2. Is the common (or ground) inside the computer connected to earth ground or is it isolated internally?
3. I built a bench power supply from a desktop computer power supply. The common (or ground terminal) on the power supply is connected to earth ground. Are there any potential problems with that? Most DC power supplies seem to have the DC ground isolated from earth ground.
Thanks,
Jack