Foil Transformer Interleaved Windings Reduce Leakage Inductance
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Solution Overview
Problem
Interleaved foil windings in transformers face challenges in minimizing leakage inductances due to the need for electrical connections between winding portions, which can weaken or lose the advantage of reduced leakage inductances if the inductance of these connections is not minimized.
Innovation Solution
The transformer design features interleaved foil windings with split end-portions folded into strips, allowing for parallel connections over other winding portions, reducing inductance and enhancing symmetry in current distribution without the need for additional conductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If additional conductors are used to connect winding portions, then connection inductance is reduced, but device complexity increases
Solution Approach 1:
The connection function is merged with the winding structure itself. The interleaved arrangement of foil conductor portions directly provides both the winding function and the connection function, eliminating the need for separate additional conductors to connect winding portions.
Solution Approach 2:
The interleaved foil conductor portions serve multiple functions simultaneously: they provide the primary winding function for magnetic coupling and also serve as the connection bridges between winding portions. This multi-functionality reduces the overall complexity of the 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 configuration effectively minimizes the inductance of electrical connections between winding portions, maintaining the benefits of interleaved windings while ensuring efficient energy discharge in applications like switched mode power supplies.
Implementation Method 1
interleaved windings where each winding comprises winding portions which are interleaved with corresponding winding portions of one or more other windings of the transformer
Data Source
AI summary
A transformer comprises first winding portions (101, 102) constituting a first foil winding and second winding portions (103, 104) constituting a second foil winding having a substantially same magnetic axis as the first foil winding. The first and second winding portions are interleaved in directions substantially perpendicular to the magnetic axis so as to reduce the leakage inductances of the first and second foil windings. The first winding portions are electrically interconnected so that at least one end-portion of each first winding portion is split to constitute two strips (105a, 105b) folded to mutually opposite directions substantially parallel with the magnetic axis, and ends of the strips of different first winding portions are interconnected to constitute connection bridges over a particular one of the second winding portions located between these first winding portions. The second winding portions are electrically interconnected in the corresponding way to constitute the second foil winding.