Stacked Transformer Coil Layout for Lower Parasitic Capacitance
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Solution Overview
Problem
Existing transformer designs face challenges in balancing inductance, quality factor, and parasitic capacitance due to different winding methods, particularly in spiral structures where higher mutual inductance leads to increased parasitic capacitance.
Innovation Solution
A transformer device comprising a first coil and a second coil with specific wire configurations, including overlapping and interlacing patterns, to optimize the balance between inductance, quality factor, and parasitic capacitance, featuring vertical connectors and Z-shaped connectors to reduce interlacing areas and enhance structural symmetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spiral winding method is used to increase mutual inductance, then inductance is improved, but parasitic capacitance increases
Solution Approach 1:
The patent divides the winding structure into stacked planar coils rather than a continuous spiral, segmenting the inductance into discrete circular loops arranged in multiple layers. This segmentation reduces the continuous parasitic capacitance paths found in spiral windings while maintaining cumulative inductance through the stacked configuration.
Solution Approach 2:
The patent transitions from a two-dimensional spiral planar structure to a three-dimensional stacked configuration of planar coils. By adding the vertical dimension with multiple stacked layers, the design achieves higher mutual inductance through increased turn-to-turn coupling while reducing parasitic capacitance by separating winding paths in the vertical direction.
2Object-generated harmful factors
If stacked coil structure is used to reduce parasitic capacitance, then parasitic capacitance is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple planar coil layers into a single integrated stacked structure that functions as one unified inductor. This merging approach reduces manufacturing complexity by eliminating the need for separate assembly steps for multiple discrete inductors, while the layered design inherently reduces parasitic capacitance through vertical separation of winding paths.
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 solution results in improved quality factor at specific frequencies, such as 2.4 GHz and 5 GHz, indicating better performance and structural symmetry, while reducing resistance and parasitic capacitance.
Implementation Method 1
a first side of a first one of the first coil is adjacent to one of the first coil, and a second side of the first one of the first coil is adjacent to one of the second coil. A first side and a second side of a second one of the first coil are adjacent to one of the second coil, respectively.
Data Source
AI summary
A transformer device includes a first coil and a second coil. The first coil includes a number of first circles. The second coil includes a number of second circles. A first side of a first one of the first coil is adjacent to one of the first coil, and a second side of the first one of the first coil is adjacent to one of the second coil. A first side and a second side of a second one of the first coil are adjacent to one of the second coil, respectively.