Coupling Loop Circuit Parasitic Inductance Cancellation
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Solution Overview
Problem
Existing coupling loop circuits fail to cancel parasitic inductance when there is a positional deviation between the first and second inductors, leading to ineffective noise filtering.
Innovation Solution
A coupling loop circuit design where the sixth conductor three-dimensionally crosses the second conductor, and the eighth conductor three-dimensionally crosses both the second and fourth conductors, ensuring spatial overlap between the first and second loop areas formed by the conductors, thereby maintaining effective electromagnetic field coupling and canceling parasitic inductance even with positional deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first inductor and the second inductor are layered in mutually different layers and spatially overlap each other, then the parasitic inductance is canceled out by the mutual inductance caused by electromagnetic field coupling, but the cancellation becomes ineffective when a positional deviation occurs in the spatial overlap
Solution Approach 1:
The patent transitions from a two-dimensional planar overlap arrangement to a three-dimensional spatial arrangement where conductors are positioned at different heights (different layers) and oriented at different angles. Specifically, the first loop area is formed by conductors in a first plane while the second loop area is formed by conductors in a second plane intersecting the first plane, creating a three-dimensional overlapping configuration that maintains magnetic coupling effectiveness despite positional deviations in any single plane
2Reliability
If the sixth conductor three-dimensionally crosses the second conductor and the eighth conductor three-dimensionally crosses the second and fourth conductors, then the overlapping area is formed by four conductors providing stable magnetic coupling, but the circuit complexity increases
Solution Approach 1:
The patent divides the coupling loop circuit into two distinct functional segments: a first loop area formed by four conductors (first, second, third, fourth) and a second loop area formed by four conductors (fifth, sixth, seventh, eighth). Each segment independently forms a complete loop, and the segmentation allows each loop to be designed and manufactured separately before being integrated through three-dimensional overlapping, thereby simplifying the overall manufacturing process while maintaining stable magnetic coupling
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 ensures that the parasitic inductance is consistently canceled, maintaining efficient noise filtering capabilities regardless of positional deviations between the conductors, thus enhancing the performance of the noise filter circuit.
Implementation Method 1
the first inductor and the second inductor are arranged in such a way that electromagnetic field coupling occurs between the inductors, and the mutual inductance caused by the electromagnetic field coupling cancels out the inductance parasitic in the bypass capacitor
Data Source
AI summary
A coupling loop circuit is constructed in such a way that a sixth conductor is made to three-dimensionally cross a second conductor, an eighth conductor is made to three-dimensionally cross each of the second conductor and a fourth conductor, a first loop area and a second loop area spatially overlap each other, and an overlapping area between the first loop area and the second loop area is formed by the second conductor, the fourth conductor, the sixth conductor, and the eighth conductor.