Planar Transformer Coil Stacking for Matched Secondary Inductance
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Solution Overview
Problem
Existing planar transformer assemblies in implantable medical devices, such as defibrillators, face challenges in achieving matching inductances among multiple secondary coils, limiting their precision and applicability, particularly in applications requiring high precision.
Innovation Solution
The planar transformer assembly is designed with multiple groups of coil windings distributed across stacked layers, where primary and secondary coil windings are interleaved, ensuring equivalent exposure to the magnetic core and electrical connectivity through vias, thereby matching the inductances of secondary coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple secondary coils are used in a planar transformer assembly, then the device can provide multiple outputs for charging capacitors, but the inductances of the secondary coils cannot be matched precisely
Solution Approach 1:
The transformer assembly is divided into multiple groups of coil windings, where each group contains a first primary coil winding on a first layer, a second primary coil winding on a second layer, and multiple secondary coil windings on intermediate layers between them. This segmentation allows each secondary coil to be independently configured with precise control over its inductance characteristics while maintaining multiple outputs.
Solution Approach 2:
Different regions of the transformer assembly have different winding configurations optimized for their specific functions. The primary coil windings are positioned on outer layers to maximize magnetic flux generation, while secondary coil windings are positioned on intermediate layers with specific turn counts and geometries to achieve precise inductance matching for each secondary output.
2Volume of moving object
If planar transformer assembly uses stacked printed circuit boards with windings, then the device size can be reduced, but achieving precise inductance matching becomes more difficult
Solution Approach 1:
The patent transitions from planar 2D winding arrangements to a 3D stacked configuration across multiple layers and printed circuit boards. By utilizing the vertical dimension with intermediate layers between primary windings on outer layers, the design achieves precise inductance matching while maintaining a compact footprint suitable for implantable devices.
Solution Approach 2:
Multiple coil windings are nested within each other across different layers, with secondary coil windings positioned on intermediate layers between primary coil windings. This nested arrangement allows efficient use of space while providing precise control over magnetic coupling and inductance values for each secondary coil.
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 design achieves inductance matching of secondary coils to within 0.5% or less, enhancing the precision and applicability of the transformer assembly in implantable medical devices.
Implementation Method 1
The secondary coil herein is magnetically coupled to the primary coil by means of a magnetic core about which the windings extend
Data Source
AI summary
A planar transformer assembly includes a primary coil, a multiplicity of secondary coils magnetically coupled to the primary coil, at least one printed circuit board, a multiplicity of layers formed on the at least one printed circuit board, and a multiplicity of groups of coil windings forming said primary coil and said multiplicity of secondary coils. Each group includes a first primary coil winding of said primary coil arranged on a first layer of said multiplicity of layers and a second primary coil winding of said primary coil arranged on a second layer of said multiplicity of layers, and a multiplicity of secondary coil windings of said multiplicity of secondary coils arranged on at least one intermediate layer of said multiplicity of layers in between said first layer and said second layer.