LAN Pulse Transformer Package with Recessed Base
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Solution Overview
Problem
Existing surface-mounted packages for pulse transformers and common mode choke coils in LANs are not sufficiently miniaturized, leading to increased insertion loss due to long lead wire routing.
Innovation Solution
A surface-mounted package with recessed portions of varying diameters for pulse transformers and common mode choke coils, arranged in a longitudinal configuration to reduce transverse and longitudinal widths, and a resin-made cover with joining plate portions and retaining pawls to secure the components, allowing for shorter lead wires and reduced insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the CMCs are disposed in the clearance between the PTs to make the package width small, then the package is miniaturized, but the lead routing becomes long and insertion loss increases
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional configuration by forming recessed portions in the base body. The CMCs are disposed in second recessed portions that are longitudinally connected to first recessed portions containing PTs, creating a stepped three-dimensional layout. This dimensional change allows the CMCs to be positioned closer to the terminals along the longitudinal direction while maintaining a compact transverse width, thereby shortening lead wire length and reducing insertion loss.
Solution Approach 2:
The base body is segmented into multiple recessed portions (first recessed portions for PTs and second recessed portions for CMCs) that are longitudinally connected. This segmentation creates distinct functional zones arranged in sequence from one terminal fixing edge toward the other, allowing optimized positioning of each component type to minimize lead routing distances while maintaining package compactness.
2Area of stationary object
If the package width is reduced by disposing CMCs in terminal intervals, then miniaturization is achieved, but the lead wire length increases
Solution Approach 1:
The patent utilizes the longitudinal dimension (from one terminal fixing edge to the other) to arrange components in a stepped configuration. By forming recessed portions that extend in the longitudinal direction and are connected sequentially, the design moves components out of the constrained transverse plane into the longitudinal axis, effectively using the third dimension to reduce overall lead wire length while maintaining compact package width.
Solution Approach 2:
The base body is given different local qualities through the formation of recessed portions with specific geometries at different locations. The first recessed portions accommodate PTs with larger diameters, while the second recessed portions accommodate CMCs with smaller diameters. This local differentiation allows each component to be optimally positioned and secured, minimizing lead routing distances from each component to its associated terminals.
Data Source
AI summary
A resin-made base body 1 has first recessed portions 11 and 12 for respectively accommodating a plurality of pulse transformers as well as second recessed portions 13 and 14 for accommodating common mode choke coils which are respectively connected to the pulse transformers. The first recessed portions 11 and 12 are formed on one terminal fixing edge 7 side of the base body 1. The second recessed portions 13 and 14 are formed on the other terminal fixing edge 10 side. The first recessed portions 11 and 12 and the second recessed portions 13 and 14 are arranged by being longitudinally connected in a direction from the one terminal fixing edge 7 toward the other terminal fixing edge 10. The adjacent first recessed portions 11 and 12 are connected at one end portion, and the adjacent second recessed portions 13 and 14 are also formed by being connected at one end portion. Thus, provided are a package for parts for LAN and a module for LAN which is miniaturized, and the insertion loss is reduced.