| Electronics > Beginners |
| Tapping into the ~400vdc from an active pfc circuit |
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| justinjja:
Never mind I'll do this one without help, thanks anyway. I need something in the range of 300-400vdc for a 3phase motor driver I'm working on. My first plan was to just rectify a 240v mains circuit to ~340v, but I figured modding a desktop psu would work just as well. Plan is to plug the psu in without an earth wire, so the 12v/5v grounds can be connected to the 400v ground. I know I'll have to make sure I program the micro controller out of circuit so I don't blow the whole thing up. (USB ground would short out the circuit) Also the case won't be earthed, so I'll have to be careful not to shock my self too. Anything else to watch out for? |
| drussell:
Do NOT disconnect the ground! The 5V/12V output grounds should already be at ground potential anyway. You still have to treat the 400V just like you would mains, though! Be sure you know exactly what you're doing since it is completely un-isolated, potentially lethal, and has high current available to fry things or start fires. The fact that you're thinking about disconnecting chassis ground leads me to suspect that you haven't thought this through completely and may not be at the level where you should be playing with the mains in random fashion. |
| justinjja:
So the 5v/12v grounds are at my house ground, but the 400v capacitor is not, that is why the ground needs to be disconnected. |
| ArthurDent:
My advice is that with your level of understanding that you may end up getting injured or electrocuted if you try this, whatever your vague idea of this is. Just forget it or hire someone who understands electrical circuits to do it. |
| justinjja:
The 400v capacitor is floating with respect to my house ground. If I tried to use both the 12v and the 400v it will short out. |
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