Paralleling Power Supply Units Made Easy ???
I am considering paralleling a couple of 20a variable adjustable psu's for 40a charging. According to what I have read on the world wide inter-web, it can be done quite easily, provided the following ...
Forum Discussion
LScamper wrote:
It has been many years and my memory is not what it use to be! My terminology may be wrong when I said error amp is over driven. What I am trying to say is that at the point that the control loop, while trying to lower the output voltage, will at some point saturate. At this point I agree with what you say. “The pwm duty cycle will go to zero percent.” At this point the control loop is now open loop. When it is open loop there is no feedback to drive the + and – inputs to the error amp to the same voltage. A long time ago operational amplifiers had a nasty habit of reversing or latching their outputs in the opposite direction than it should when this happened. This would turn the converter output full on, a bad thing. Maybe this condition can no longer happen, I don't know. With parts being made in China I would not bet on anything.
From MEXICOWANDERER's last post it seems as if something bad happens when paralleled! Maybe what I just said?
LScamper wrote:
I don't think anyone can say exactly how they will react to being paralleled without a complete knowledge of how they are designed.
Without having much more information about each power supply, lots of bad things could/can happen.
I agree, trusting everything will work 100% when it isn't designed to operate a specific way, is asking for trouble...
