Dmitriy,

The "traditional" answer to this question is using the bond wire to chassis
(or the live feed wire to the battery) as a current shunt. This works OK
but can be improved by adding temperature compensation. Adding logrithmic
amplifiers (one for each direction) may also be desirable if you are
wanting to cover the whole range.
Are you including cranking current for  example? - or just normal charge &
discharge?.

Embedding a temperature sensor in the bond wire & using it to correct for
wire resistance is probably going to be enough. You will need to figure out
a way of calibrating it however.

 An opamp can perform the amplification, filtering  & any level shift
required.

Richard P





Hello everyone,
 I think about measuring current in car.
 The problem I see - current is big enough and impulses
 may go really high and measure voltage drop on resistor I see chalenging.
 Another thing I'd like to have -
 indication of current direction to or from battery.
 Anybody has any thoughts? Current transformator, Hall sensor (??)
 anything else?
Thanks.
Dmitriy Fitisov.

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