Magnetic Field Detection Device Using Segmented Coils
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Solution Overview
Problem
Current magnetic field detection technologies face limitations in drive capability and power consumption, especially when dealing with high activating currents, due to increased coil resistance, which restricts the detection of stronger magnetic fields and is inefficient with low supply voltages.
Innovation Solution
The solution involves operating multiple field coils simultaneously with a single control circuit unit, using coupling circuits to distribute excitation signals across electrically separated coils, allowing for adaptable and efficient magnetic field detection, even with low supply voltages, by selectively activating subgroups of field coils and using transistor devices for efficient current driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple coil windings are used to improve detection of higher magnetic fields, then the detectable magnetic field strength is improved, but the coil resistance increases significantly
Solution Approach 1:
The patent divides the excitation function into multiple separate field coils (first field coil, second field coil, third field coil) that are electrically independent. Each coil can be independently controlled by separate control circuits, allowing the system to achieve high magnetic field detection capability without requiring a single high-resistance multi-winding coil. The segmentation of coils reduces individual coil resistance while maintaining overall detection strength through combined excitation.
2Strength
If high activating currents are used to detect stronger magnetic fields, then the detection capability is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic control of field coil excitation through separate control circuits for each coil. The control circuits can selectively activate specific coils based on the required detection strength, adjusting the excitation current dynamically rather than using high constant current continuously. This allows the system to achieve high detection capability when needed while reducing power consumption during normal operation.
Solution Approach 2:
The control circuits generate periodic excitation signals for the field coils, allowing the system to achieve sufficient magnetic field detection through timed excitation cycles rather than continuous high current application. This periodic action reduces average power consumption while maintaining detection capability during active measurement periods.
3Device complexity
If a single control circuit is used for multiple sensor elements, then the device complexity is reduced, but the drive capability for high magnetic fields is limited
Solution Approach 1:
The patent segments the control function by providing separate control circuits for each field coil, which enables independent control and higher drive capability for each coil. This segmentation allows each control circuit to optimize its output for the specific coil it controls, achieving higher overall drive capability while maintaining manageable system complexity through modular control architecture.
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
This approach enables cost-effective, space-saving, and high-performance magnetic field detection with reduced power consumption, allowing for flexible measurement of magnetic fields of varying strengths without being limited by coil resistance, suitable for battery-powered devices.
Implementation Method 1
The excitation device (20) includes a control circuit unit (2) and a plurality of coupling circuits (A1 through An), each of which are electrically connected to the control circuit unit (2), and each coupling circuit being electrically connected to an associated field coil (S1 through Sn).
Implementation Method 2
The sensor element usually includes a closed or open ferromagnetic core, a field coil with single or multiple windings, and a detection coil with single or multiple windings.
Data Source
AI summary
A magnetic field detection device and a corresponding method for detecting a magnetic field. The magnetic field detection device includes a coil core, a receiving coil coupled to the coil core, a plurality of electrically separated field coils coupled to the coil core, an excitation unit for generating a magnetic field excitation via a particular excitation current of the plurality of field coils coupled to the coil core and an evaluation unit for evaluating a magnetic field signal received via a receiving coil coupled to the coil core.