In order to solve the problem that the Hall current sensor has a small dynamic current test range, low linearity, and a bandwidth that cannot meet the actual engineering needs, a zero-flux Hall current sensor is designed. The zero-flux principle is used to detect the current of the secondary coil and the feedback current is used to calculate the primary current. The REF232 voltage reference chip is used to provide the working current for the HW300B Hall element. The instrument amplifier AD620 is used to amplify the Hall voltage generated by the Hall element. Tests show that the current dynamic test range of the sensor is 50% higher than that of the same type of sensor, the linearity can reach 0.2% of the input current, and the bandwidth can reach 300 kHz.
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