nametc3 Posted August 20, 2006 Report Share Posted August 20, 2006 I need design a fixed current power supply DC 100A, about 200W, help me thank you ! Quote Link to comment Share on other sites More sharing options...
audioguru Posted August 20, 2006 Report Share Posted August 20, 2006 What are you going to use 2V at 100A for? Quote Link to comment Share on other sites More sharing options...
nametc3 Posted August 20, 2006 Author Report Share Posted August 20, 2006 I want measure resistance about micro ohm, by mV metter drop on resistance Quote Link to comment Share on other sites More sharing options...
ante Posted August 20, 2006 Report Share Posted August 20, 2006 You could rewind the secondary 5Volts (or 3.3V) in a computer PSU to 2Volts (or which voltage you want) and boost the rectifier circuit. You have to arrange a shunt and some feedback to the regulator circuit to obtain a constant current. There are different ways to do this but these are heavier and more expensive. Quote Link to comment Share on other sites More sharing options...
indulis Posted August 20, 2006 Report Share Posted August 20, 2006 But 1 micro ohm and 100A gives you .1mV. You said you have a mV meter.Seems like a better meter would be an "easier road", than the cost and trouble of constructing a 100A source (these current levels are not easy to deal with). Contact resistance and wire IR drop come into consideration REALLY FAST!! Quote Link to comment Share on other sites More sharing options...
ante Posted August 20, 2006 Report Share Posted August 20, 2006 Hi indulis,I agree, 100A is not easy to handle and there might be a better solution to this depending on the target for the measurements. This amount of current will sure require some heavy duty KELVIN CLIPS! ;D Quote Link to comment Share on other sites More sharing options...
Muhammad Abu Bakar Posted August 20, 2006 Report Share Posted August 20, 2006 Hello nametc3,To measure R in uOhm range KELVIN bridge is used. It uses meter movement (as your v-meter) to detect the test resistense arainst a variable known R. If u plan I-surce V-meter then even the connecting wires can add up to many more u-ohms. Its not practical approach at this level of R.Search www for more on Kelvin Bridge. Quote Link to comment Share on other sites More sharing options...
nametc3 Posted August 21, 2006 Author Report Share Posted August 21, 2006 thank But I want have diagram source fixed current 100A DC, help me Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.