Toroid Inductor Nested Turns Reduce EMI Leakage
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Solution Overview
Problem
Toroid inductors suffer from significant electromagnetic field leakage, leading to electromagnetic interference (EMI) that can adversely affect nearby electronic circuits, limiting their application in integrated circuits and mobile/wearable devices.
Innovation Solution
The design incorporates intertwined turns and multiple outer vias to create a built-in enclosure, reducing electromagnetic field leakage and enhancing the quality factor (Q value) and inductance of the toroid inductor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a toroid inductor is designed with higher inductance and quality factor, then the inductance and Q factor are improved, but electromagnetic field leakage increases causing EMI
Solution Approach 1:
The patent applies nesting by placing a first toroid inductor structure inside a second toroid inductor structure, creating a nested configuration where the inner toroid is enclosed by the outer toroid. This nested arrangement contains the electromagnetic fields within the inner toroid, preventing field leakage to surrounding circuits while maintaining high inductance and quality factor performance.
Solution Approach 2:
The patent converts the harmful electromagnetic field leakage into a beneficial contained field by using the outer toroid structure as a shielding enclosure. The outer toroid acts as a Faraday cage that traps the electromagnetic energy generated by the inner toroid, transforming the EMI problem into a contained energy storage solution that improves overall system performance.
2Reliability
If a toroid inductor is designed with higher inductance, then the inductance is improved, but electromagnetic field leakage increases causing EMI
Solution Approach 1:
The patent applies nesting by placing a first toroid inductor structure inside a second toroid inductor structure, creating a nested configuration where the inner toroid is enclosed by the outer toroid. This nested arrangement contains the electromagnetic fields within the inner toroid, preventing field leakage to surrounding circuits while maintaining high inductance and quality factor performance.
Solution Approach 2:
The patent converts the harmful electromagnetic field leakage into a beneficial contained field by using the outer toroid structure as a shielding enclosure. The outer toroid acts as a Faraday cage that traps the electromagnetic energy generated by the inner toroid, transforming the EMI problem into a contained energy storage solution that improves overall system performance.
3Object-generated harmful factors
If electromagnetic field leakage is reduced by adding shielding structures, then EMI is reduced, but device complexity increases
Solution Approach 1:
The patent merges the shielding function with the inductor structure itself by making the outer toroid serve dual purposes: it forms part of the inductive element while simultaneously acting as an electromagnetic shield. This integration eliminates the need for separate shielding components, reducing device complexity while effectively containing EMI.
Solution Approach 2:
The outer toroid structure performs multiple functions: it contributes to the overall inductance of the device, provides electromagnetic shielding, and contains the fields from the inner toroid. This multi-functionality reduces the need for additional components, thereby lowering device complexity while achieving EMI reduction.
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 effectively minimizes electromagnetic interference, allowing toroid inductors to be positioned closer to electronic circuits without adverse effects, resulting in improved performance and smaller device sizes for mobile and wearable applications.
Implementation Method 1
The plurality of second turns is at least partially intertwined with the plurality of first turns... create a built-in enclosure, reducing electromagnetic field leakage
Implementation Method 2
The toroid inductor 100 includes a plurality of first interconnects 102, a plurality of second interconnects 104, a plurality of first vias 110, and a plurality of second vias 112
Data Source
AI summary
A toroid inductor includes a plurality of first turns configured in a first ring shape and a plurality of second turns configured in a second ring shape. The plurality of first turns includes a plurality of first upper interconnects, a plurality of first lower interconnects, and a plurality of first vias coupled to the plurality of first upper interconnects and to the plurality of first lower interconnects. The plurality of second turns is at least partially intertwined with the plurality of first turns. The plurality of second turns includes a plurality of second upper interconnects, a plurality of second lower interconnects, and a plurality of second vias coupled to the plurality of second upper interconnects and to the plurality of second lower interconnects.