Constant current control

eiphan · Dec 26, 2012

Hi,

I am making a meter that can measure low resistance (0.01 Ohm ~ 1 Ohm). For that, I want to make a dc dc converter that can control constant current 10A. Anyone has sample circuit? Also please tell me which chip should I use? Any analog IC or MCU will do. I have attached my initial thought. Is it correct?
Thank you so much.

alexan_e · Dec 26, 2012

Using such a high current to make the measurement doesn't make sense to me.

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eiphan · Dec 27, 2012

@ Alexan_e
thank you so much. but I have to design it without multimeter.

alexan_e · Dec 27, 2012

I'm not sure what you mean , eventually you will have to measure the voltage drop , are you not?

eiphan · Dec 27, 2012

yes. I will measure voltage drop across test resistance. But the requirement is to inject constant current of 1A or 10A. Since resistance is very small, higher current can ensure accuracy, I guess. I will measure both current and voltage and then send to ADC of Microcontroller for Ohm reading LCD display. I am not sure how to make or choose circuit that can control constant current. Any idea? Thank you,

Constant current control

eiphan

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