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bidirectional current sensing using hall sensor

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aumkota27

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Hi guys,

My application is sensing of charging and discharging of battery and giving the hall sensor output to controller which senses only positive voltages. so i need to level shift the output voltage of hall sensor. hall sensor used is LA55-P.

Anyone please give me the circuit for interfacing hall sensor voltage and controller. also do we need an isolated supply +/- 12v supply for this application.

Go through my attachment also.

--Om
 

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FvM

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LA 55 has a current output, that is usually converted to a voltage by a shunt. The voltage supply has to be referred to the same ground as the shunt and won't be isolated. A simple level shifting OP circuit can be used to adapt voltange range and offset to your requirements.

For moderate accuracy requirements, LEM has hall sensors with 5V supply and voltage output, e.g. HTFS series, that are lower priced and better suited for simple µP interface. Also other vendors, e.g. Honeywell have similar types.
 

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