Isolation Transformer with Six-Wire Twisted Cable for High Speed Data
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Solution Overview
Problem
Existing high-speed data communication transformers face challenges in achieving optimal coupling between windings due to leakage inductance, particularly at higher frequency ranges, which affects voltage regulation and data transmission rates.
Innovation Solution
The design incorporates a transformer core with elongated through-bores and a six-wire cable configuration, where conductive wires are twisted around a central non-conductive core in a specific angular relationship, enhancing coupling and reducing leakage inductance through improved winding distribution and symmetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional twisting and interleaving techniques are used to reduce leakage inductance, then coupling between windings is improved, but device complexity and manufacturing difficulty increase significantly
Solution Approach 1:
The patent divides the winding structure into discrete segments positioned at specific angular intervals (e.g., every 60 degrees for six segments) around the core. Each segment is independently formed by twisting three wires around a central non-conductive core, creating modular units that are easier to manufacture while maintaining overall coupling performance.
Solution Approach 2:
The patent applies different structural characteristics to different parts of the winding system. Specifically, it positions winding segments at optimized angular intervals around the core, and uses a specific three-wire twist configuration within each segment. This local optimization of structure and positioning improves coupling without requiring complex interleaving of entire winding layers.
2Reliability
If more interleaved windings are used to improve coupling, then leakage inductance is reduced, but the difficulty of controlling wire order and achieving symmetry increases
Solution Approach 1:
Instead of attempting to interleave multiple complete winding layers which requires precise control of wire order throughout, the patent segments the windings into discrete angular positions. Each segment is formed by a simple three-wire twist that maintains inherent symmetry, eliminating the need to track and control complex wire ordering across multiple interleaved layers.
Solution Approach 2:
The patent combines multiple primary and secondary windings into a single twisted cable assembly where three conductive wires are twisted together around a central non-conductive core. This merging of windings into an integrated twisted structure simplifies manufacturing while maintaining the necessary coupling characteristics through the twisted geometry.
3Ease of manufacture
If circular through-bores are used in the core, then winding is simpler, but wire spacing becomes non-uniform causing bunching and increased parasitic capacitance
Solution Approach 1:
Instead of using a circular through-bore and accepting non-uniform wire spacing, the patent inverts the approach by using a rectangular cross-section core with square through-bores. This geometric inversion creates uniform spacing between wires as they pass through the bores, reducing parasitic capacitance while maintaining ease of winding through the straightforward rectangular geometry.
Solution Approach 2:
The patent transitions from a circular cross-section (one-dimensional symmetry) to a rectangular cross-section (two-dimensional grid symmetry). This dimensional change allows wires to be spaced uniformly in both horizontal and vertical directions, creating a more regular distribution pattern that reduces parasitic effects while preserving winding simplicity.
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 improves data transmission rates by increasing coupling between windings, reducing parasitic elements, and supporting bandwidths up to 1,800 MHz, while simplifying the winding process and maintaining symmetry for better electromagnetic perturbation uniformity.
Implementation Method 1
Transformers are devices that transfer electrical energy from one electrical circuit to another electrical circuit through the use of inductively coupled conductors. As is well understood, a varying current in a primary winding creates a varying magnetic flux and thus a varying magnetic field through a secondary winding. This varying magnetic field induces a varying electromotive force ('EMF') or voltage in the secondary winding.
Implementation Method 2
Leakage inductance is caused by an imperfect coupling of the windings, which creates a leakage flux that does not link with all the turns of the secondary transformer windings. The purpose of both twisting and interleaving techniques is to attempt to distribute electromagnetic energy (both internal energy and externally generated energy) to each of the primary and secondary windings as equally and as completely as possible.
Data Source
AI summary
An isolation transformer includes a transformer core. First and second through-bores extend through the transformer core from a first surface to a second surface. Each through-bore has an elongated profile with at least a portion of the elongated profile providing a respective flat winding surface. The flat winding surfaces are spaced apart by a central portion of the transformer core. The transformer is wound with a six-wire cable having a central non-conductive core. First, second, third, fourth, fifth and sixth conductive wires are positioned around and adjacent to the central non-conductive core in a substantially equally spaced angular relationship. The second conductive wire is positioned between the first conductive wire and the third conductive wire; and the fifth conductive wire is positioned between the fourth conductive wire and the sixth conductive wire. The conductive wires are twisted about the central non-conductive core at a selected twist density.