Transformer Shielding Winding for High-Frequency Interference Isolation
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Solution Overview
Problem
Existing methods for reducing high-frequency interferences between windings of a transformer wound around a common core are either costly or ineffective.
Innovation Solution
A device with a shielding winding or film between the windings, where the shielding and core are connected to the reference potential of the interference-emitting winding, utilizing capacitive coupling to direct interferences back to the source, thereby enhancing shielding effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding winding is arranged between the first winding and the second winding, then high-frequency interferences are reduced, but the device complexity increases
Solution Approach 1:
The shielding winding is electrically connected to both the first winding and the core, merging multiple functional elements into a single integrated component that provides both shielding and reference potential stabilization, thereby reducing overall device complexity while maintaining interference reduction effectiveness
Solution Approach 2:
The shielding winding acts as an intermediary element between the interference-emitting first winding and the sensitive second winding, providing a controlled electrical path that redirects high-frequency interferences back to the source through capacitive coupling while preventing their propagation to the second winding
2Object-affected harmful factors
If the shielding winding is connected to the reference potential of the first winding, then interference reduction effectiveness is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The shielding winding is connected to the reference potential of the first winding through capacitive coupling, creating an equipotential relationship that stabilizes the electrical reference level and reduces high-frequency interferences without requiring precise mechanical positioning or complex connection structures
Solution Approach 2:
The connection between the shielding winding and the first winding is implemented through capacitive coupling rather than direct electrical connection, changing the electrical parameter from zero impedance to frequency-dependent impedance, which effectively reduces high-frequency interferences while simplifying manufacturing requirements
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
Significantly reduces high-frequency interferences by ensuring the shielding and core are at the same electrical reference potential, effectively preventing interference propagation to the second winding.
Implementation Method 1
utilizing capacitive coupling to direct interferences back to the source
Data Source
AI summary
A device for reducing high-frequency interferences between first and second windings of a transformer that includes a first winding (W1) and a second winding (W2), which are wound around a common core, wherein the first winding (W1) is an interference-emitting winding and a shielding winding (WS) or a shielding film (WS) is arranged between the first winding (W1) and the second winding (W2), wherein the shielding winding (WS) and the core are connected to the reference potential (B) of the first winding (W1).