The principle of differential measurement to eliminate the zero bias of integrated Hall sensors is as follows:
Differential measurement is a commonly used method to eliminate the zero bias. The basic principle of differential measurement is to place two identical sensors in a magnetic field at the same time to measure, and then perform differential operations on their voltage signals to eliminate the effects of zero bias.
Specifically, suppose there are two identical integrated Hall sensors A and B, and they are placed in a magnetic field and measured separately to obtain their output voltages Va and Vb. At this point, their respective zero offsets will have an impact on the output results. However, if their voltage signals are subjected to a differential operation, i.e., (Va-Vb), the zero offsets of the two sensors are eliminated, leaving only their measurements relative to the magnetic field.
The following are the applications of Hall sensors:
1, vehicle electronic system: Hall sensors can be used in the steering system, speed system and braking system of the car to detect the steering angle, speed and brake position and other information.
2, industrial automation: in the industrial environment, Hall sensors are widely used to detect the position, speed and direction of rotation, such as machine tools, robots, rail transportation and other fields.
3, household appliances: in small household appliances, Hall sensors can be used to detect the speed of the motor, such as regulating the cooling effect of refrigerators, controlling the washing time of washing machines.
4, electronic equipment: in electronic equipment, Hall sensors can detect the switch state, such as detecting the switch state of the Smart Cover function in the cell phone.
5, medical equipment: in the medical field, Hall sensors can be used to detect the voltage of human muscles, so as to infer the activity of the muscles.