Dear Sir/ Madam,
We are building a project having the title: " Closed - Loop Hall Effect Sensors for DC Residual Ground Fault Current Detection"
Exact Current to be sensed is : 20 mA DC Current
I have read the Datasheet and Application document for 50 and 100 A detection, but some concepts were not clear to me.
Following are the questions :
1.] a.] Does the H- Bridge Driver also function as an Amplifier ? Or the Amplification for Compensation is done by the "Pre - Driver" ? Is the Gain Selection for Pre - Driver ?
Can you please send a link or suggest a source where I can clearly understand the working of a H-Bridge Driver to drive Electromagnetic/ Compensation Coil ?
b.] How does the Closed Loop Compensation exactly work ?
2.] Will the Current Spinning eliminate the Hall Sensor Offsets for such Low Current Detection ? Apart from the Magnetic Core, which we have to design.
Below is an extra question just for understanding:
3.] Will Earth's Magnetic Flux need to be taken into account for such Low Current Sensing ? Will it create great offset in the Hall Sensor and finally in the DRV 411 or this will be mitigated through Current Spinning ?
Sorry if the questions are basic, this being my first time designing a Sensing Circuit. Flux- Gate Sensors have better sensitivity but we are using Hall - Effect to obtain good shielding from noises or external fields.
Thank you very much.