ELECTRICAL MEASUREMENT TECHNIQUES TO COMPENSATE A SHIFT DRIFT

摘要

A method (70) for determining a resistance value of a shunt (30) coupled to a battery connector (26), the method comprising: receiving (72) an input signal corresponding to a voltage across the shunt (30); during a first conversion cycle in the absence of a excitation applied to the shunt (30) and during a second conversion cycle in the presence of the excitation applied to the shunt (30): generating a first digital signal using a combination of a chopped input signal and an offset error; determining a first output signal (Vout1) under Using a stripped first digital signal; anddetermining a second output signal (Vout2) using the first digital signal; anddetermining the resistance (rShunt) of the shunt (30) using the first and second output signals (Vout1, Vout2) from the first and second conversion cycles.