Lateral GMR Signal Transmission Across Galvanic Isolation Barriers
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Solution Overview
Problem
Increasing the electrical isolation between a giant magnetoresistive (GMR) sensor and conductors transmitting magnetic signals across an isolation barrier without increasing the thickness of the isolation barrier, which would raise costs and require redesigning the device.
Innovation Solution
Positioning the conductors at least partially laterally relative to the GMR sensor within an insulating material, allowing for increased distance and reduced signal strength to be compensated by increasing the number of turns or current strength, rather than thickening the isolation barrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the isolation barrier is increased to enhance electrical isolation, then the breakdown voltage is improved, but the device cost and complexity increase significantly
Solution Approach 1:
The patent transitions from vertical signal transmission (perpendicular to the isolation barrier) to lateral signal transmission (parallel to the isolation barrier). This dimensional change allows the signal to travel along the isolation barrier rather than through it, maintaining electrical isolation while enabling communication between conductive regions without requiring increased barrier thickness or complex redesign
2Reliability
If traditional vertical communication methods are used, then signal transmission is achieved, but signal strength is reduced and complexity increases
Solution Approach 1:
The patent employs lateral communication where conductors are positioned to transmit signals horizontally along the isolation barrier rather than vertically through it. This approach maintains signal strength by avoiding penetration of the isolation barrier, reduces the need for additional isolation materials, and simplifies the overall device structure while achieving reliable signal transmission
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 method effectively increases the breakdown voltage of the isolation barrier without the need for additional material or redesign, making it a cost-effective and simpler solution for maintaining signal integrity across the barrier.
Implementation Method 1
one or more conductors positioned at least partially inside the insulating material... magnetically coupled to a giant magnetoresistive (GMR) element
Implementation Method 2
The MR or GMR element has a resistance that is variable in response to a magnetic field applied by the coil
Data Source
AI summary
In some examples, a device includes a first conductive region and a second conductive region that is galvanically isolated from the first conductive region. The device further includes one or more conductors, wherein each conductor of the one or more conductors is electrically connected to circuitry in the first conductive region. The device also includes a giant magnetoresistive (GMR) sensor electrically connected to circuitry in the second conductive region and magnetically coupled to the one or more conductors, wherein the GMR sensor is positioned at least partially lateral relative to the one or more conductors.