Dynamic Current Control for Magnetic Proximity Sensing

The patent implements dynamic current control that adjusts the transmitter coil current based on real-time magnetic field strength measurements. The system starts with low current and incrementally increases it only when necessary to achieve the target magnetic field strength at the sensor, rather than continuously applying high current. This dynamic adjustment resolves the contradiction by providing high current only when needed for precision while minimizing overall exposure to damaging current levels.

The system employs a feedback mechanism where the magnetic field strength at the sensor is continuously measured and used to control the transmitter current. The controller compares the measured field strength with the target value and adjusts the current accordingly, creating a closed-loop control system. This feedback ensures that high current is applied only when necessary to achieve precise positioning, thereby maintaining reliability while enabling measurement precision.

The patent implements periodic measurement and adjustment cycles instead of continuous high current application. The system periodically measures the magnetic field strength and adjusts the current in discrete steps, allowing the coil to rest at lower current levels between adjustments. This periodic action maintains positioning accuracy when needed while significantly reducing average power consumption compared to continuous high current operation.

The system dynamically changes the current parameter based on the measured magnetic field strength and distance to the sensor. When the sensor is close or the field is sufficient, the current is reduced to low levels. When the sensor is far or the field is weak, the current is increased only to the minimum level needed to achieve the target field strength. This parameter adaptation resolves the contradiction by maintaining precision only when necessary while minimizing energy consumption.