Connecting multiple switched power supplies together

Thread Starter


Joined Jan 16, 2007

I am planning a project that would involve 3.3v logic (microprocessor) driving relatively high-current 24 volt DC solenoids, via a mosfet interface. Can I use separate switched power supplies of the appropriate voltages and power capabilities, and tie the negative side of each supply together and to the overall circuit's ground ? I.e. two separately plugged-in supplies ? I have read things elsewhere on the net suggesting this is a bad idea when the context is a PC motherboard (ground loop currents will flow and upset regulation, or burn up), but I don't think my case is the same. I think they are talking of putting separate supplies of the same voltage in parallel in order to boost the total power available.

Thanks in advance...


Joined Apr 20, 2004

Perhaps you could post a schematic so we could have a better idea of your project? In general, though, switchers don't play well together.