Magnetoresistive Sensor Phase Shift Adaptation
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Solution Overview
Problem
Magnetic sensor devices based on the magnetoresistive effect are not compatible with processing elements designed for Hall effect sensor devices due to a 90° phase shift in output signals, which is not compatible with further processing elements like ECUs in the automotive industry.
Innovation Solution
A magnetic sensor device with a bridge circuit comprising two half-bridges, each with magnetoresistive structures, that determines the rotation direction by calculating the phase difference between their output signals, allowing for a 90° phase shift adjustment to match the phase behavior of Hall effect sensor devices through a switching circuit operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetoresistive sensor device is used, then sensitivity and jitter performance are improved, but compatibility with processing elements expecting Hall effect phase behavior is lost
Solution Approach 1:
The patent applies dynamics by making the sensor device operable in two different operational modes that can be switched between. The bridge circuit configuration can be dynamically changed to produce either a 90° phase-shifted output signal (magnetoresistive mode) or a 0°/180° phase-shifted output signal (Hall effect compatible mode), allowing the device to adapt to different processing element requirements while maintaining improved sensitivity and jitter performance
Solution Approach 2:
The patent changes the phase parameter of the output signal by altering the bridge circuit configuration. By switching between different operational modes, the phase relationship between the output signal and the sensed magnetic field changes from 90° (inherent to magnetoresistive sensors) to 0° or 180° (compatible with Hall effect processing elements), thus resolving the compatibility issue while preserving the sensitivity advantages
2Length of stationary object
If a magnetoresistive sensor device is used, then distance between sensor and magnetic component can be increased, but phase shift incompatibility with ECUs occurs
Solution Approach 1:
The patent enables dynamic switching between operational modes that produce different phase characteristics. This allows the sensor to operate at increased distances from the magnetic component (utilizing the advantage of magnetoresistive sensing) while switching to Hall effect compatible mode when interfacing with ECUs that expect conventional phase behavior
Solution Approach 2:
The patent makes the magnetoresistive sensor device universal by enabling it to function in two distinct modes: one optimized for distance operation with 90° phase shift, and another for ECU compatibility with 0°/180° phase shift. This multi-functionality allows the single device to replace both magnetoresistive and Hall effect sensors in different application scenarios
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
Enables compatibility with both magnetoresistive and Hall effect-based processing elements, allowing the magnetic sensor device to be used in applications requiring the phase behavior of Hall effect sensor devices, thus expanding its applicability in the automotive industry.
Implementation Method 1
Magnetic sensor devices based on a magnetoresistive effect exhibit improved sensitivity and improved jitter compared to conventional sensor devices based on the Hall effect
Data Source
AI summary
A magnetic sensor device for determining a rotation direction of a magnetic component about a rotation axis is provided. The magnetic sensor device includes a bridge circuit with a first half-bridge and a second half-bridge. Each of the first half-bridge and the second half-bridge comprises at least one magnetoresistive structure. Further, the magnetic sensor device includes an evaluation circuit configured to determine the rotation direction of the magnetic component based on a phase difference between an output signal of the first half-bridge and an output signal of the second half-bridge.