Magnetic Detector Bridge Circuit Reduces Current Consumption
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Solution Overview
Problem
Existing magnetic detectors face challenges in reducing consumption current due to limited space for element resistance increase, particularly in NS detection sensors, where the number of elements required reduces available space, leading to insufficient element resistance and increased current consumption.
Innovation Solution
A magnetic detector design incorporating a bridge circuit with a series circuit of magnetoresistance elements and a parallel series circuit of fixed resistance elements, where the fixed resistance elements have higher resistance values, allowing for increased element resistance without matching with magnetoresistance elements, and incorporating these elements into an integrated circuit to reduce consumption current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of elements is increased to achieve NS detection functionality, then the detection capability is improved, but the available space for each element is reduced, leading to insufficient element resistance and increased current consumption
Solution Approach 1:
The patent divides the bridge circuit into two separate series circuits: the first series circuit contains magnetoresistance elements for detection, while the second series circuit contains only fixed resistance elements. This segmentation allows the fixed resistance elements to have higher resistance values without needing to match the magnetoresistance elements, thereby reducing current consumption while maintaining NS detection capability through the differential bridge configuration
Solution Approach 2:
The patent changes the resistance parameter configuration by allowing fixed resistance elements in the second series circuit to have resistance values that do not need to match the magnetoresistance elements. This parameter change enables the use of higher resistance fixed resistance elements, which directly reduces the consumption current while preserving the detection functionality through the bridge circuit's differential operation
2Use of energy by moving object
If the element resistance is increased to reduce current consumption, then the current consumption is reduced, but the available space for element placement is insufficient
Solution Approach 1:
By segmenting the bridge circuit into two independent series circuits with different resistance requirements, the patent enables the second series circuit to use high-resistance fixed resistance elements without requiring large physical dimensions. The fixed resistance elements can achieve high resistance values through material selection and geometric configuration within the available space, thereby reducing current consumption without increasing element placement area
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 design effectively reduces consumption current while maintaining high detection accuracy and operational stability, with the ability to increase element resistance and flexibility in detector design, even in smaller sizes.
Implementation Method 1
at least one of the resistance elements is a magnetoresistance element having an electric resistance that changes in accordance with an external magnetic field using a magnetoresistance effect
Data Source
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AI summary
[Object] To provide a magnetic detector capable of reducing a consumption current, as compared with those of existing magnetic detectors. [Solving Means] A second series circuit 34 is connected in parallel to a first series circuit 26 including a first magnetoresistance element 23. The second series circuit 34 is further connected in parallel to a third series circuit 30 including a second magnetoresistance element 27. The second series circuit 34 includes fixed resistance elements 31 and 32. The electric resistance of the fixed resistance elements 31 and 32 is made higher than that of each of the resistance element 23, a resistance element 24, the resistance element 27, and a resistance element 28 included in a sensor unit 21, thereby reducing a consumption current.