Magnetic Sensor Alternating Current Noise Suppression
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Solution Overview
Problem
Current magnetic sensors face challenges in enhancing sensitivity for detecting magnetic fields, particularly in accurately processing the changes in electrical resistance due to alternating current components, which affects noise suppression and detection accuracy.
Innovation Solution
The magnetic sensor design incorporates a first magnetic element, a conductive member with a corresponding portion, an element current circuit, and a first current circuit that supplies an alternating current with specific duration and pulse values of varying polarities, optimizing the electrical resistance change to achieve high sensitivity detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an alternating current component is supplied to the magnetic sensor, then the sensitivity of magnetic field detection is improved, but noise increases making it difficult to accurately process electrical resistance changes
Solution Approach 1:
The patent applies periodic action by using alternating current with specific frequency components to excite the magnetic sensor. The alternating current causes periodic changes in electrical resistance that correspond to the magnetic field being measured. By using periodic excitation at known frequencies, the system can distinguish the signal from random noise through frequency-selective processing.
Solution Approach 2:
The patent implements feedback by measuring the electrical resistance changes caused by alternating current and using this information to calculate the magnetic field strength. The system continuously monitors the resistance variations and adjusts the calculation to account for the alternating current effects, effectively using the measured data to improve the accuracy of subsequent measurements.
2Productivity
If the alternating current frequency is increased to improve detection speed, then productivity is improved, but noise suppression becomes more difficult
Solution Approach 1:
The patent uses periodic action with specific frequency characteristics to enable fast detection while maintaining noise suppression. By choosing alternating current frequencies that are well-defined and periodic, the system can process signals quickly through frequency-domain analysis while the periodic nature allows for effective filtering of non-periodic noise components.
Solution Approach 2:
The patent applies parameter changes by optimizing the frequency parameters of the alternating current. Specific frequency ranges and duty cycles are selected to balance detection speed and noise suppression. The system changes the temporal parameters of the current waveform to achieve optimal performance for different measurement conditions.
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 configuration enables highly sensitive magnetic field detection by suppressing noise and accurately processing the frequency components of the alternating current, leading to improved sensitivity and accuracy in magnetic field measurement.
Implementation Method 1
a first current circuit configured to supply a first current including an alternating current component to a first corresponding portion of the conductive member
Implementation Method 2
a first magnetic element; a conductive member including a first corresponding portion... an element current circuit configured to supply an element current to the first magnetic element
Data Source
AI summary
According to one embodiment, a magnetic sensor includes a first magnetic element, a conductive member including a first corresponding portion, an element current circuit configured to supply an element current to the first magnetic element, and a first current circuit configured to supply a first current to the first corresponding portion. The first corresponding portion is along the first magnetic element. The first current includes an alternating current component. The first current includes a first duration of a first current value of a first polarity, a first pulse duration of a first pulse current value of the first polarity, a second duration of a second current value of a second polarity, and a second pulse duration of a second pulse current value of the second polarity. The second polarity is different from the first polarity.