An open-loop current sensor using Hall induction principle
1. Single power supply 5V power supply
2 supports unidirectional and bidirectional output
3 Analog signal output
The measurement current range of the 4 primary sides can range from ± 50A to ± 1500A
5. Sensor operating temperature range: -40 ° C to+125 ° C
6 Good accuracy, linearity, and temperature drift
7 low internal resistance, effectively controlling heating power consumption
Applied to electric vehicles and motor controllers; The measurement types include DC, AC, and pulse.
The open-loop current sensor utilizes Ampere's law (the magnetic field generated around a straight wire is proportional to the current in the wire), and utilizes the characteristics of Hall devices to detect the magnitude of the magnetic field intensity B generated by the primary current, thereby detecting the current in the wire. The proportional relationship between B and I within the linear range of hysteresis is:
B (IP)=K * IP (K is a constant)
Hall voltage can be expressed as:
VH=(RH/d) * I * K * IP
Except for IP, which is a variable, all others are constants, thus:
VH=K1 * IP (K1 is a constant)
A specific Hall chip calculates the primary current by amplifying VH to obtain voltage.