how to interface current transformer in pic microcontroller

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raman00084

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i bought a 20a / 20ma current transformer if i connect 20a load i will get 20ma output. my project is over current circuit breaker how to read the 20ma current in pic 18f4520 ic it is a ac current.

kindly help
kalyan
 

First decision: read bipolar AC current signal and process it in software (needs input bias to Vref/2) or implement a precision rectifier circuit in front of the ADC and process a DC signal.

You'll find examples for both approaches in previous Edaboard threads, did you already notice the suggested "similar threads" at the bottom of this page?
 
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