Planar Transformer Insulation via Electrophoretic Deposition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for insulating planar transformer conductive components, such as lead frames and printed circuit boards, are inefficient, prone to human error, and fail to provide uniform coverage, especially on edges, leading to potential electrical breakdown and increased production costs.
Innovation Solution
An electrophoretic deposition process is used to apply a conformal insulating coating, with an intervening oxidized metal layer for enhanced adhesion and stability, ensuring comprehensive coverage of conductive components, including edges, to prevent electrical breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual gluing or hot pressing of polymeric films is used to insulate lead frames, then insulation is provided, but the process is time-consuming, requires trained manpower, and produces uneven coverage especially on edges
Solution Approach 1:
The patent replaces the manual mechanical process of gluing or hot pressing polymeric films with an automated electrophoretic deposition process. The insulating coating is applied electrochemically through immersion in a coating bath with applied voltage, eliminating the need for manual handling, alignment, and pressing operations. This substitution dramatically improves both productivity through automation and reliability through uniform edge coverage achieved by the electrophoretic mechanism.
Solution Approach 2:
The patent changes the fundamental parameter of how insulation is applied - from mechanical attachment of pre-formed films to electrochemical deposition of coating material from solution. By controlling electrical parameters (voltage, time, bath composition), the process achieves uniform coating thickness including on vertical edges, while enabling automated high-volume production without trained manual labor.
2Reliability
If thick polymeric films are used to ensure sufficient insulation, then dielectric strength is improved, but the overall thickness of the planar transformer increases
Solution Approach 1:
The patent changes the material parameters of the insulating coating by using electrophoretically deposited ceramic-containing coatings that achieve high dielectric strength at much thinner thicknesses compared to conventional polymeric films. The electrochemical deposition process enables precise control of coating thickness and composition, providing sufficient insulation with minimal added thickness to the planar transformer structure.
Solution Approach 2:
The patent employs composite insulating coatings containing ceramic particles dispersed in a polymeric binder matrix. This composite structure provides superior dielectric properties and breakdown strength at reduced thickness compared to homogeneous polymeric films, as the ceramic phases create tortuous paths for electrical breakdown while the polymer provides mechanical flexibility and adhesion.
3Ease of manufacture
If conventional coating methods are used, then application is simple, but uniform coverage on irregular copper shapes and edges cannot be achieved
Solution Approach 1:
The patent replaces simple mechanical dipping or spraying methods with electrophoretic deposition that uses electrical fields to drive uniform coating formation. The electrochemical mechanism ensures that coating material is deposited proportionally on all conductive surfaces including vertical edges and irregular copper geometries, achieving manufacturing precision that mechanical methods cannot attain while maintaining automated simplicity.
Solution Approach 2:
The electrophoretic deposition process is self-regulating through the electrochemical mechanism - the coating builds up until the electrical field is balanced by the insulating layer formed, automatically achieving uniform thickness without requiring precise control of immersion time or speed. The process self-adjusts to complex geometries, with edges and irregular surfaces receiving appropriate coating coverage through the electrical field distribution.
4Productivity
If automated coating processes are implemented, then productivity increases, but complex equipment and process control are required
Solution Approach 1:
The patent uses electrophoretic deposition that replaces complex multi-step mechanical coating equipment with a relatively simple electrochemical cell setup. The automation is inherent in the electrochemical process itself rather than requiring complex robotic manipulation or precision positioning systems. This substitution achieves high productivity through automated batch or continuous processing while keeping equipment complexity manageable through the simplicity of the electrochemical cell 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 method provides a reliable, automated, and cost-effective insulation solution with improved adhesion and dielectric strength, effectively addressing the limitations of traditional insulation techniques by ensuring uniform coverage and enhanced protection against electrical breakdown.
Implementation Method 1
an insulating coating can be applied to the conductive components of planar transformers by means of an electrophoretic deposition
Implementation Method 2
an intervening layer should be formed between the conductive component and the EPD coating... the first layer comprises an oxidized metal coating
Data Source
AI summary
Provided is an electrically insulated component for use in a planar transformer. The insulated component may include a planar transformer conductive component having a first surface, a second surface and a plurality of edges. The insulated component may also include a first layer including an oxidized metal coating, as well as a second layer including an electrophoretically deposited (EPD) insulating coating. The EDP coating may include a polymer and an inorganic material. The first layer and the second layer may cover at least the first surface and the plurality of edges of the conductive component and the first layer may be disposed between the conductive component and the second layer. Also provided is a method of manufacturing of the electrically insulated component.