UneXisted Posted April 3, 2012 Report Share Posted April 3, 2012 I would like to measure the current through a coil in a DC circuit, but I'm not sure how to accomplish this. I cannot put a sense resistor in between and the coil is my only option to indicate for the current. I was thinking about measuring the voltage over the coil, but I'm not sure how the voltage relates to the current for this coil. Do you have any ideas? Quote Link to comment Share on other sites More sharing options...
Hero999 Posted April 3, 2012 Report Share Posted April 3, 2012 You need to know both the current and voltage,in order to calculate the resistance, for more information look up Ohm's law. Quote Link to comment Share on other sites More sharing options...
UneXisted Posted April 3, 2012 Author Report Share Posted April 3, 2012 In this case we are talking about DC current. I want to design a circuit that enables me to log the DC current that flows through the coil. Therefore I need a measurement method to measure the current. Quote Link to comment Share on other sites More sharing options...
UneXisted Posted April 4, 2012 Author Report Share Posted April 4, 2012 Another way would be to derive the current by the number of turns of the coil. Deriving the current by the resistance is not possible you guys say? due to the AC current. I have a spare motherboar with the same coil that i can unsolder. I can use it to measure the characteristics if needed. The only option I have is to use a Hall Effect sensor I think, but thats my last solution because i have to place it inside a computer. THere is a great chance that interference will occur. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted April 4, 2012 Report Share Posted April 4, 2012 Another way would be to derive the current by the number of turns of the coil. Deriving the current by the resistance is not possible you guys say? due to the AC current. I have a spare motherboar with the same coil that i can unsolder. I can use it to measure the characteristics if needed. But I thought you were talking about DC current?Deriving the DC current is easy: you need to know the resistance and voltage and use Ohm's law.Calculating the AC current is also not difficult but you need to know the inductance too.The only option I have is to use a Hall Effect sensor I think, but thats my last solution because i have to place it inside a computer. THere is a great chance that interference will occur.A Hall effect sensor will work but for AC it'll need to work up to the frequency being measured.But why do it the hard way? It's DC so measure the resistance of the coil, the voltage across it and calculate the current. Quote Link to comment Share on other sites More sharing options...
login
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.