Magnetic Sensor Blocks for Dual-Linearity
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Solution Overview
Problem
Existing dual linear current sensors face challenges such as increased chip area due to the need for amplifiers and complex processes for forming different magnetoresistance elements on the same chip.
Innovation Solution
A magnetic sensor configuration that includes a substrate with blocks arranged on one surface, where magnetoresistance elements are disposed in these blocks, allowing for dual or multi-linearity without the need for amplifiers, by utilizing magnetoresistance elements with identical magnetic sensing directions in series to form resistor sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an amplifier with variable amplification factor is used to achieve dual linear current sensing, then measurement precision is improved, but chip area increases
Solution Approach 1:
The sensor is divided into multiple blocks (first block and second block) with magnetoresistance elements having different sensitivity characteristics. Each block operates independently to provide linear measurement in different current ranges, eliminating the need for a single amplifier to handle all ranges.
Solution Approach 2:
Different regions of the sensor (first block and second block) are designed with different local properties - magnetoresistance elements with different saturation characteristics are placed in different blocks. This allows each region to optimize for specific current ranges without requiring global amplification adjustments.
2Measurement precision
If two types of magnetoresistance elements with different structures are formed on the same chip to achieve dual linearity, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Instead of creating fundamentally different magnetoresistance element structures, the invention achieves dual linearity by changing operational parameters - specifically, by placing magnetoresistance elements at different distances from the conductor to create different magnetic field strengths, resulting in different sensitivity and saturation characteristics without complex structural variations.
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 achieves dual or multi-linearity with adjustable sensitivity, reducing chip area and simplifying the manufacturing process, while maintaining effective current measurement capabilities.
Implementation Method 1
a plurality of magnetoresistance elements disposed on the substrate, wherein a part of the plurality of magnetoresistance elements is disposed in the first block and another part is disposed in the second block
Implementation Method 2
A magnetic sensor and a current sensor... installed on a conductor... measuring a current in a range equal to or less than the detection limit
Data Source
AI summary
A magnetic sensor 60 includes a substrate 61 installed on a conductor 24, where a plurality of blocks including first blocks 62a, 63a and second blocks 62b, 63b positioned near and far from the center of the conductor, respectively, relative to each other are arranged on one surface of the substrate, and a plurality of magnetoresistance elements 51 disposed on the substrate, wherein a part of the plurality of magnetoresistance elements is disposed in the first block and another part is disposed in the second block, and the first and second blocks include first subblock 62a1, 63a1, 62b1, 63b1, respectively, on which the magnetoresistance elements 51 having magnetic sensing directions that are directions identical to each other, and the magnetoresistance elements in the first subblocks 62a1, 63a1, 62b1, 63b1 of the first and second blocks 62a, 63a, 62b, 63b are connected in series to form the resistor side R1.