Dirk.S
New Member
Hello everyone
I'm trying to figure out how to implement a current limiter that will be able to limit current up to 5A. I was browsing through the web today to try and find a suitable design but I'm not too sure as to which one to use. One of the promising ones were one found on wikipedia:
**broken link removed**
and alternatively I found a current source circuit that utilizes a opamp and a mosfet.
http://www.freecircuits.net/circuit-57.html
I was thinking about using the current source circuit but just want to confirm that I understand it correctly. As the voltage applied to the opamp negative leg varies so does the output voltage effectively biasing the mosfet more or less on (By setting R1). In turn letting more or less current flow through the mosfet. If this is the case which I'm not too sure about, can't I just replace the opamp with a variable voltage to switch the mosfet more or less on?
My main idea is that I would like to use an analog output from a micro controller to bias the mosfet more or less on to limit the current more or less depending on the analog output value from the micro controller? Thank you in advance.
I'm trying to figure out how to implement a current limiter that will be able to limit current up to 5A. I was browsing through the web today to try and find a suitable design but I'm not too sure as to which one to use. One of the promising ones were one found on wikipedia:
**broken link removed**
and alternatively I found a current source circuit that utilizes a opamp and a mosfet.
http://www.freecircuits.net/circuit-57.html
I was thinking about using the current source circuit but just want to confirm that I understand it correctly. As the voltage applied to the opamp negative leg varies so does the output voltage effectively biasing the mosfet more or less on (By setting R1). In turn letting more or less current flow through the mosfet. If this is the case which I'm not too sure about, can't I just replace the opamp with a variable voltage to switch the mosfet more or less on?
My main idea is that I would like to use an analog output from a micro controller to bias the mosfet more or less on to limit the current more or less depending on the analog output value from the micro controller? Thank you in advance.