Lateral Routing of Inductive Windings for Creepage Clearance
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Solution Overview
Problem
Existing inductive devices with two or more windings fail to maximize creepage and clearance distances, which is crucial for reducing electronic component size while maintaining electrical performance, and are not compatible with automated production methods.
Innovation Solution
The design includes a surface mount inductive device with primary and secondary windings routed via a lateral port to enhance creepage and clearance, featuring a self-leaded header with terminals on multiple sides and a winding post, allowing windings to exit via the port and be routed to terminals on opposing sides, thereby increasing clearance and enabling heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional inductive device configurations are used with cores considered as conductors, then the device structure is simple, but the total clearance distance is reduced by the diameter of the core
Solution Approach 1:
The patent extracts the core from the clearance calculation by routing windings laterally around the core rather than through it. The primary winding enters and exits laterally, and the secondary winding is routed around the exterior of the core, effectively removing the core diameter from the clearance path and increasing the effective clearance distance without adding device complexity.
Solution Approach 2:
The patent transitions from a traditional top-bottom winding arrangement to a lateral routing configuration. By routing windings around the sides of the core rather than through the top and bottom, the design utilizes the lateral dimension to increase clearance distance while maintaining a compact overall device structure.
2Volume of moving object
If compact inductive devices are designed to reduce size, then the form factor is improved, but creepage and clearance distances are compromised
Solution Approach 1:
The patent uses lateral routing of windings around the core to maximize the use of available space. By routing conductors around the exterior of the core rather than through the interior, the design achieves longer creepage and clearance paths within a compact footprint, effectively utilizing the lateral dimension to overcome the size-reliability tradeoff.
Solution Approach 2:
The patent employs curved routing paths for the windings around the core, following the contours of the core structure. This curved configuration allows the windings to maintain optimal clearance distances while fitting within a compact device envelope, maximizing space utilization without compromising electrical isolation.
3Extent of automation
If self-leaded headers with multiple side terminals are used, then automated production compatibility is improved, but device complexity increases
Solution Approach 1:
The self-leaded header structure integrates multiple functions: it provides mechanical support for the windings, serves as the electrical connection interface for automated assembly, and defines the lateral routing path for the conductors. This multi-functional design achieves automated production compatibility without proportionally increasing device complexity.
Solution Approach 2:
The patent merges the header structure with the winding support and routing features into an integrated assembly. The self-leaded header incorporates the terminal structure, winding support, and lateral routing channels in a single component, reducing overall device complexity while maintaining compatibility with automated production processes.
Data Source
AI summary
A low profile, small size and high performance electronic device for use in, e.g., electronic circuits which provides maximum creepage and/or clearance distances. In one embodiment, the device is configured for a small footprint and utilizes two or more windings that require isolation. The exemplary device includes a self-leaded header made from a unitary construction which comprises a generally a box-like support body having a cavity for mounting a circuit element with primary and secondary windings, the support body having a base and a plurality of leads extending generally horizontally outward from the support body adjacent the base, the support body having one side opening on a side with leads permitting the loading of the inductive device in the cavity, and a routing channel residing on the top of the base, so as to maximize the creepage and clearance distance of the electronic device. Shaped-core and other embodiments are also disclosed.