Center-Tapped Transformer Winding Thickness Optimization
Solution Overview
Problem
Center-tapped transformers face high magnetic core and winding losses due to the asymmetrical current flow in their secondary windings, which are not efficiently addressed by the conventional design of equal copper sheet thickness for primary and secondary windings, leading to suboptimal use of the limited window area and increased volume, weight, and cost.
Innovation Solution
The design of center-tapped transformers is optimized by varying the thickness of primary and secondary winding conductors, with the ratio of total primary conductor thickness to total secondary conductor thickness falling within the range of 0.65 to 0.8, to minimize losses caused by high-frequency skin and proximity effects, using insulating layers and specific conductor materials like copper, silver, and aluminum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If equal thickness copper sheets are used for primary and secondary windings, then manufacturing convenience is improved, but winding loss increases
Solution Approach 1:
The patent applies different copper sheet thicknesses to different windings based on their specific current characteristics. The primary winding uses a first thickness while secondary windings use a different thickness, optimizing each winding's performance for its specific operating conditions rather than using a uniform thickness throughout.
Solution Approach 2:
The patent changes the physical parameter of copper sheet thickness to optimize performance. By adjusting the thickness parameter differently for primary and secondary windings, the design achieves minimum loss in the window area while accounting for the asymmetric current distribution in center-tapped transformers.
2Volume of moving object
If frequency is increased to reduce magnetic element volume, then power density is improved, but magnetic core loss and winding loss increase sharply
Solution Approach 1:
The patent optimizes conductor thickness parameters to minimize losses at high frequencies. By carefully selecting and adjusting the thickness of copper sheets in primary and secondary windings, the design reduces winding loss while maintaining the benefits of high-frequency operation, including reduced magnetic element volume and increased power density.
3Loss of energy
If optimized conductor thickness ratio (0.65-0.8) is used, then winding loss is reduced by 5%-12%, but design complexity increases
Solution Approach 1:
The patent implements local optimization by applying different copper sheet thicknesses to different windings. This localized differentiation reduces overall winding loss while keeping the design relatively simple - only requiring different thickness specifications for primary and secondary windings, not a complete redesign of the entire transformer structure.
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 optimized design reduces winding losses by 5% to 12% compared to conventional designs, particularly effective in frequency ranges between 500 kHz and 2 MHz, by balancing fundamental harmonic and DC losses in the transformer.
Implementation Method 1
The outer surface of each of the primary effective conductor and the first and second secondary effective conductors is coated with an insulating layer
Implementation Method 2
a center-tapped transformer which can achieve a minimum loss in the same window area... comprises a magnetic core and windings
Data Source
AI summary
A center-tapped transformer comprises a magnetic core, and windings including a primary winding and a secondary windings. The primary winding comprises at least one layer of a primary effective conductor, and the secondary winding comprises at least one layer of a first secondary effective conductor and at least one layer of a second secondary effective conductor. The total thickness hp of the primary effective conductor and the total thickness hs of the secondary effective conductor satisfy: 0.65<hp/hs<0.8, wherein hp is equal to the sum of the thicknesses dp of all the layers of the primary effective conductor, and hs is equal to the sum of the thicknesses ds of all the layers of the first and the second secondary effective conductor.