Magnetizing Device for Magnetic Field Sensor Arrays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional magnetic field sensors experience elevated noise and undesirable zero field errors due to misorientation of magnetization when exposed to high magnetic field strengths, and existing magnetizing methods suffer from parasitic capacitances causing undesirable current flows in magnetizing devices.
Innovation Solution
A method and system using a magnetizing device with parallel-connected half-bridges and center tap connections to divide the magnetizing current conductor into separately controllable segments, preventing parasitic capacitance-induced current flows in undesirable directions, thereby ensuring proper magnetization orientation and reducing noise and zero field errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a magnetizing current conductor is used to magnetize magnetic field sensors, then magnetization orientation is improved, but parasitic capacitances cause undesirable current flows in opposite directions
Solution Approach 1:
The magnetizing device is divided into multiple independently controllable half-bridge circuits, each capable of magnetizing specific sensor groups. This segmentation allows selective activation of magnetizing paths, preventing parasitic current flows from affecting the entire array when only certain sensors require magnetization.
Solution Approach 2:
The half-bridge circuits are pre-configured with switches and center tap connections before magnetization begins. This preliminary setup ensures that magnetizing current paths are established in advance, allowing controlled current direction and preventing reverse current flows caused by parasitic capacitances during the magnetization process.
2Adaptability or versatility
If multiple switches are used to control magnetizing segments, then separate magnetization control is improved, but device complexity increases
Solution Approach 1:
Each half-bridge circuit serves multiple functions: it can magnetize different sensor groups, control current direction, and prevent parasitic current flows. This multi-functionality reduces the need for additional dedicated components, balancing control versatility with device complexity.
Solution Approach 2:
The center tap connections act as intermediaries between the power supply and the magnetizing current conductors. These center taps provide a reference point that simplifies the switching control logic, allowing each half-bridge to independently control its magnetizing segment without requiring complex coordination between all switches.
3Reliability
If magnetizing current flows in opposite direction due to parasitic capacitances, then noise and zero field errors increase, but the magnetizing device structure remains simple
Solution Approach 1:
The magnetizing device uses dynamically controllable switches in each half-bridge circuit to adjust current direction and magnitude in real-time. This dynamic control prevents parasitic capacitances from causing reverse current flows, thereby reducing noise and zero field errors without requiring a fundamentally complex static structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces noise in magnetic field sensors, especially at high magnetic field strengths, and prevents undesirable changes in zero field error and gain, ensuring accurate magnetization of magnetic field sensors.
Implementation Method 1
A magnetizing current conductor of the magnetizing device is situated so as to run in the area of the magnetic field sensors in such a way that elements of the magnetic field sensors may be magnetized
Implementation Method 2
Certain conventional magnetic field sensors are based on magnetoresistive effects. Magnetic field sensors of this type include two magnetized layers situated one above the other
Data Source
AI summary
A magnetic field sensor array includes a plurality of sensor segments, each including a plurality of magnetic field sensors. A magnetizing current conductor is situated so as to run in the area of the magnetic field sensors in such a way that elements of the magnetic field sensors may be magnetized. A plurality of parallel-connected half-bridges, each including a high switch pJ and a low switch nJ, each include a center tap connection situated between the switches. The magnetizing current conductor is connected to each center tap connection, by means of which the magnetizing current conductor is divided into separately activatable magnetizing segments. Elements of a sensor segment are magnetized in that two switches nJ and pJ+1 having different electrical potentials, or alternatively pJ and nJ+1, of two directly adjacent half-bridges are closed simultaneously. At least one further switch nX<J or pY>J+1 or alternatively pX<J or nY>J+1 is closed.