I'm constructing a boost converter, and I need to measure both the input current and the output current. Currents range anywhere from 25A to 200A, depending on the model. My controller is referenced to the negative rail of the converter. I've been focusing on hall effect sensors, but it occurs to me that I could use shunt resistors in the negative leg instead. What are the advantages and disadvantages of each approach?
Electronic – What are the advantages of a shunt resistor vs. a hall effect sensor
current measurementhall-effectresistorsshunt
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Best Answer
I am not an expert in the field but I can try to help jotting down some quick ideas.
Hall effect sensor
pros:
cons:
Shunt resistor
pros:
small and cheap, I bet that with a good pcb manufacturer you can make your shunt resistor on the pcb paying only for the increased size, but keep in mind that the copper resistivity depends on temperature, moreover the pcb outer layers thickness is not precise while inner layers are somewhat better.
You can get cheap SMD shunt resistors down to 1m\$\Omega\$ from ohmite
cons:
That is just what comes to me from the top of my mind, I'd be very happy to integrate/correct this list reflecting any reasonable comment from below.