Magnetic Detection Apparatus Dynamic Threshold Adjustment
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Solution Overview
Problem
Conventional magnetic detection apparatuses face accuracy issues in detecting the traveling direction of magnetic moving bodies due to deviations in the amplitude range of output voltages from threshold values, leading to fixed output signals and inability to determine rotation direction.
Innovation Solution
The apparatus includes first and second groups of magnetoelectric conversion elements, comparison circuits, and analogue/digital conversion circuits that adjust threshold values and reference potentials based on peak or bottom values of output signals, ensuring accurate detection even when amplitude ranges deviate from threshold values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional magnetic detection apparatus uses fixed threshold values for comparison circuits, then the device complexity is reduced, but measurement precision deteriorates due to amplitude range deviations
Solution Approach 1:
The patent applies dynamics by making the threshold values and reference potentials dynamically adjustable rather than fixed. The threshold value adjusting apparatus modifies comparison circuit thresholds based on detected peak or bottom values, while the reference potential adjusting apparatus adjusts amplification circuit reference potentials similarly. This dynamic adjustment ensures accurate traveling direction detection despite amplitude range deviations caused by productional or thermal variations in magnetoelectric conversion elements.
2Reliability
If the amplitude range of output voltage deviates from threshold value, then the output signal becomes fixed, but the ability to detect traveling direction is lost
Solution Approach 1:
The patent implements feedback mechanisms where the threshold value adjusting apparatus continuously monitors the output signal characteristics and adjusts comparison circuit thresholds accordingly. Similarly, the reference potential adjusting apparatus uses feedback from detected peak or bottom values to adjust amplification circuit reference potentials. This feedback ensures that even when amplitude ranges deviate, the system adapts to maintain both signal stability and traveling direction detection capability.
Solution Approach 2:
The patent changes critical parameters (threshold values and reference potentials) dynamically based on detected signal characteristics. When amplitude range deviations occur, the system modifies these parameters to restore proper detection functionality. This parameter adjustment prevents the output signal from becoming fixed and maintains the ability to determine traveling direction accurately.
3Adaptability or versatility
If productional or thermal variation occurs in magnetoelectric conversion element, then offset between output voltages increases, but detecting accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by detecting peak or bottom values of output signals and adjusting threshold values and reference potentials in advance before actual traveling direction detection occurs. This preliminary adjustment compensates for offsets caused by productional or thermal variations, ensuring that the system is properly calibrated before measurement, thereby maintaining detecting accuracy under varying environmental 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 allows for accurate detection of the traveling direction of magnetic moving bodies by dynamically adjusting threshold values and reference potentials, preventing fixed output signals and ensuring reliable rotation direction determination.
Implementation Method 1
a first group of magnetoelectric conversion elements that is disposed in such a way as to face a magnetic moving body and that converts a change in a magnetic field, caused by a travel of the magnetic moving body, into a change in an electric quantity
Data Source
AI summary
There is provided a magnetic detection apparatus in which based on a second comparison signal or a first comparison signal, a second analog/digital conversion circuit or a first analog/digital conversion circuit converts a second amplification signal or a first amplification signal into a digital value at a time when the peak value of the first amplification signal or the second amplification signal is detected or at a time when the bottom value of the first amplification signal or the second amplification signal is detected, as the case may be, and that can implement at least one of actions in which based on comparison between the digital value converted and a predetermined reference value, a second threshold value adjusting apparatus or a first threshold value adjusting apparatus adjusts a second threshold value or a first threshold value, as the case may be.