Core-Based Current Sensors With Integrated Coils for Closed-Loop Compensation
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Solution Overview
Problem
Closed-loop core-based current sensors require a cumbersome and costly process to loop a coil around the core for compensation, resulting in a larger footprint and increased complexity compared to open-loop sensors.
Innovation Solution
Integration of a compensation coil with the substrate and magnetic field sensor in a closed-loop current sensor, utilizing a magnetic core with a gap and a coil configured for negative magnetic feedback, enabling simplified manufacturing and reduced cost while maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coil is looped around the magnetic core for compensation, then closed-loop compensation is achieved, but the manufacturing process becomes cumbersome and costly
Solution Approach 1:
The compensation coil is integrated directly into the substrate with the magnetic field sensor, merging what were previously separate components (coil wound around core) into a unified structure. This integration eliminates the cumbersome manual winding process while maintaining the compensation function through the substrate-integrated coil that provides negative magnetic feedback.
2Reliability
If a coil is looped around the magnetic core for compensation, then closed-loop compensation is achieved, but the device footprint increases
Solution Approach 1:
The compensation coil is merged with the substrate and magnetic field sensor assembly, eliminating the need for a separate coil structure that would occupy additional space. The integrated coil utilizes the existing substrate area, thereby maintaining a compact footprint while achieving closed-loop compensation.
3Reliability
If a coil is looped around the magnetic core for compensation, then closed-loop compensation is achieved, but additional complexity is introduced
Solution Approach 1:
The compensation coil is integrated into the substrate alongside the magnetic field sensor, merging multiple functions into a single structural unit. This reduces structural complexity by eliminating the need for separate coil winding operations and associated components, while the electrical connections remain integrated within the substrate.
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
The integrated coil configuration provides high bandwidth and reduced complexity, achieving similar accuracy to prior-art techniques at a lower cost and with simplified manufacturing processes.
Implementation Method 1
The magnetic core has a gap 101a formed in it, where a magnetic field sensor 105, typically a Hall effect sensor, is positioned. In operation, the current carried by the conductor 102 creates a magnetic field. This field is concentrated by the magnetic core 101
Implementation Method 2
a magnetic field sensor 105, typically a Hall effect sensor, is positioned
Implementation Method 3
closed loop transducers utilize the magnetic field sensor voltage to create a compensation current (IC) in a circuit secondary coil 103 to create a total flux, as measured by the magnetic field sensor, equal to zero
Data Source
AI summary
Systems, circuits, and methods provide core-based closed-loop current sensors utilizing a coil connected to an IC having a magnetic field sensor configured to measure current in one or more conductors such as busbars. A closed-loop current sensor includes a magnetic core having first and second ends separated by a gap and an aperture receiving the one or more conductors; a magnetic field sensor disposed on a substrate and integrated in an IC is disposed in the gap, where the magnetic field sensor is configured to receive magnetic flux from the gap, where the IC is configured to measure AC current in the one or more conductors; and a coil integrated with the substrate and coupled to the IC, wherein the coil is configured to provide negative magnetic feedback for closed-loop compensation.