Building a Current sensing circuit using DC-DC converter
Bookmark this page:
 Yahoo!
 Google
 Windows Live
 del.icio.us
 digg
 Netscape
|
|
|||||||||||||
|
Posted by pyose on December 11, 2005, 6:01 am
Please log in for more thread options Building a Current sensing circuit using DC-DC converter Good Afternoon guys, As mentioned at the subject, i really have to build the circuit for my class project..the problem is i dont know where to start and what components should i buy..maybe someone has the practical circuit i could refer to or is there any reference from the internet i should take a look? i really have to start building it right now..thanx Pyose, Malaysia | |||||||||||||
|
Posted by JeffM on December 12, 2005, 1:42 pm
Please log in for more thread options Have your instructor give a class in How to Write a Specification. | |||||||||||||
|
Posted by Jan Wagner on December 12, 2005, 3:03 pm
Please log in for more thread options
pyose wrote: > Building a Current sensing circuit using DC-DC
> converter > > As mentioned at the subject, i really have to build the circuit for my > class project..the problem is i dont know where to start and what > components should i buy..maybe someone has the practical circuit i > could refer to or is there any reference from the internet i should > take a look? i really have to start building it right now..thanx You mean current sensing /for/ a DC-DC converter? There are many ways, for example if you want to measure the switching current then a simple toroidal ferrite core with a single winding (lots of turns) would do. Feed the current carrying wire through the center of the toroid, place a small resistor accross the toroid winding, and there you go, output voltage is proportional to the current in the wire that goes through the toroid. Example coils http://www.coilws.com/Current%20Sensse.htm http://en.wikipedia.org/wiki/Transformer#Current_transformers If you want to sense DC current, a hall effect sensor could do. If it doesn't have to be galvanically isolated current sensing, then you could also use a series resistor ("real resistor" or just a thin ning slab of copper, circuit board trace, etc) which is placed e.g. on the ground lead. Then measure the voltage drop accross the resistance, typically is some millivolts (U=R*I...) If you want to see how to use the current sensing in a DC-DC converter, check the application notes for various PWM controllers, they usually have example circuits that show current sensing, too. For example http://www.onsemi.com/pub/Collateral/AN983-D.PDF TL494, LM3524, UC3864, ... - Jan | |||||||||||||
| Similar Threads | Posted |
| Building a Current sensing circuit using DC-DC converter | December 11, 2005, 6:01 am |
| building your own mic preamp and a/d converter | March 20, 2005, 5:18 pm |
| Building static phase converter? | December 8, 2005, 2:36 pm |
| current sensing | January 16, 2006, 1:08 pm |
| Re: 50A DC Current Sensing | February 13, 2006, 12:17 pm |
| Sensing the flow of current | August 1, 2004, 3:42 pm |
| Need help with current sensing circuits | May 31, 2005, 12:12 pm |
| high-side current sensing chips | April 8, 2008, 12:40 pm |
| LM358A for high-side current sensing | July 13, 2008, 12:41 pm |
| Using the THS4281 for high side current sensing | October 25, 2008, 8:36 am |
| gas sensing circuit help!!!! | April 15, 2006, 3:40 pm |
| sensing circuit w/ out comparator | April 7, 2005, 5:38 pm |
| Newbie: Simple amplifier and voltage to current converter | December 13, 2007, 8:26 am |
| Re: 12V to 7.2V DC converter circuit? | May 11, 2006, 11:45 am |
| Puzzling circuit in EDN design ideas (NE555 voltage to frequency converter) | March 2, 2008, 4:31 pm |
>...i dont know where to start
> Pyose