Transformer Protruding Windings for High Coupling Factor
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Solution Overview
Problem
Conventional transformers in integrated circuits have limited coupling factor values, leading to reduced energy conversion efficiency and increased signal loss, particularly in high-frequency applications.
Innovation Solution
The design incorporates protruding portions and openwork slots on both the primary and secondary windings, allowing them to induct with each other without electrical contact, thereby increasing the coupling factor and enhancing energy conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transformer is disposed far from the substrate to avoid coupling effect with IC devices, then the reliability is improved, but the coupling factor k deteriorates
Solution Approach 1:
The patent transitions from a planar two-dimensional transformer layout to a three-dimensional structure by adding protruding portions that extend vertically between windings. This dimensional change increases the effective coupling area without requiring additional substrate distance, thereby improving the coupling factor while maintaining reliable spacing from IC devices.
Solution Approach 2:
The protruding portions are nested within the spatial gap between the primary and secondary windings, utilizing the existing vertical space more efficiently. This nesting approach increases the magnetic coupling path length without requiring additional horizontal or vertical space that would compromise the distance from IC devices.
2Loss of energy
If the width of windings and distance between windings are reduced to increase coupling factor, then the coupling factor k is improved, but the manufacturing precision requirement worsens
Solution Approach 1:
Instead of reducing winding width and spacing in the planar dimension, the patent introduces protruding portions in the vertical dimension. This approach increases the coupling factor by extending the magnetic interaction path vertically, thereby avoiding the need for tighter tolerances in winding dimensions and spacing.
3Loss of energy
If protruding portions are added to increase coupling factor, then the coupling factor k is improved, but the device complexity worsens
Solution Approach 1:
The protruding portions are integrated with the existing winding structures, merging the coupling enhancement feature with the electrical conductors themselves. This integration approach increases the coupling factor without requiring separate components or complex assembly processes, thereby limiting the increase in device complexity.
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 configuration significantly increases the coupling factor, improving energy conversion rates and reducing signal loss, as demonstrated by increased coupling factor values from 0.745 to 0.942 at 1 GHz, enhancing the performance of transformers in high-frequency circuits.
Implementation Method 1
The secondary winding and the primary winding induct with each other
Data Source
AI summary
A high coupling factor transformer and a manufacturing method thereof are provided. The transformer includes a primary winding and a secondary winding. The secondary winding is adjacent to the primary winding. The secondary winding and the primary winding induct with each other. The primary winding includes a plurality of first protruding portions, and the secondary winding includes a plurality of second protruding portions. The first protruding portions stretch to the secondary winding without electro-contact, and the second protruding portions stretch to the primary winding without electro-contact.