Traditional Hall current sensor measuring range is small

accuracy is low

frequency range is narrow

response is slow

now it can’t meet the needs of practical engineering.In order to meet the demand for the field of nuclear fusion

a kind of zero flux Hall current sensor is designed. Based on the principle and properties of zero flux

a kind of digital driving circuit using pulse width modulation（PWM） as the core is designed

through Hall element induces magnetic field to form Hall voltage

after amplification circuit

integral regulation circuit

PWM generation circuit

power amplification circuit

feedback circuit

eventually form secondary side compensation current

thus ensure Hall element in a state of zero-flux. Test show that current measuring range of the sensor is±30 k A

the accuracy grade is 0.5

frequency range can be up to 20 k Hz

response time is within 5 μs.