Stacked Transformer Trace Layout for Magnetic Field Cancellation
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Solution Overview
Problem
Existing transformers, particularly those with crossing and stacked-type structures, suffer from low inductance density and low Q value, limiting their applications.
Innovation Solution
A transformer device with a specific structural configuration featuring first and second traces with sub-traces on different layers, interconnected by connection members, and input/output members, designed to cancel out magnetic fields and improve harmonic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a crossing structure is used for the transformer, then the structure can be compact, but the inductance density becomes low
Solution Approach 1:
The patent transitions from planar traces to three-dimensional stacked-type inductors with multiple layers (first layer, second layer, third layer). The first and second traces are disposed on different layers and connected via connection members, creating a vertical stacking architecture that increases inductance density while maintaining compact footprint.
2Quantity of substance
If a stacked-type structure is used for the transformer, then the inductance density can be improved, but the Q value becomes low
Solution Approach 1:
The patent employs magnetic field cancellation by configuring the first and second traces to generate opposing magnetic fields. The first trace winds from outer side to inner side while the second trace winds from inner side to outer side, creating counter-directional magnetic fields that cancel common-mode inductance and reduce magnetic interference, thereby improving Q value.
3Object-generated harmful factors
If the first trace is wound from outer side to inner side and then from inner side to outer side on another metal layer, then the magnetic field cancellation is achieved, but the device complexity increases
Solution Approach 1:
The patent divides each trace into multiple sub-traces (first sub-trace, second sub-trace on first layer; third sub-trace, fourth sub-trace on second layer) connected by connection members. This segmentation allows independent optimization of each sub-trace's winding direction and path, facilitating magnetic field cancellation while managing structural complexity through modular design.
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 transformer device achieves low inductance values at common mode and enhances second harmonic performance, addressing the limitations of existing transformer designs.
Implementation Method 1
the magnetic field generated by the traces of the transformer device of the present disclosure during operation can be mutually canceled
Data Source
AI summary
A transformer device includes a first and a second trace, a first and a second connection member, and a first input/output member. A second sub-trace of the first trace is coupled to a first sub-trace of the first trace at a first and a second area. The first connection member is coupled to the first and the second sub-trace. The first and a third sub-trace of the second trace are disposed in turn. A fourth sub-trace of the second trace is coupled to the third sub-trace at the first and the second area. The second and the fourth sub-trace are disposed in turn. The second connection member is coupled to the third and the fourth sub-trace. The first sub-trace includes first wires, and the first input/output member is coupled to the first wire which is located at an inner side among the first wires.