PCB Layout With Slotted Inductor Mounting for Compact POL Power
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Solution Overview
Problem
The integration of point of load (POL) converters into highly integrated ICs faces challenges in managing space and thermal performance, with traditional designs increasing the footprint and current density, and generating excessive heat, which complicates thermal management.
Innovation Solution
A PCB layout design featuring halogen-free prepreg layers and slotted portions paired with pads on the printed wiring board (PWB) reduces the footprint while maintaining mechanical stability and improving thermal performance by allowing one-sided slotting for inductor mounting and using pads for landing inductors, thus balancing mechanical stability without increasing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional POL converter designs are used, then integration is achieved, but footprint and current density increase
Solution Approach 1:
The patent utilizes the Z-dimension by creating slotted portions that extend through multiple conductive layers of the PCB. This vertical arrangement allows inductors to be mounted on the surface while their leads pass through slots in multiple layers, effectively using three-dimensional space to reduce the horizontal footprint of the power converter assembly.
Solution Approach 2:
The design nests multiple functional elements within a compact structure: inductors are mounted on the PCB surface with leads passing through slotted portions that extend through multiple conductive layers. This nested arrangement integrates the inductor mounting, electrical connection, and thermal management functions within a minimal footprint area.
2Adaptability or versatility
If traditional POL converter designs are used, then integration is achieved, but current density increases
Solution Approach 1:
The slotted portions extend through multiple conductive layers in the vertical dimension, distributing current paths across several layers rather than concentrating them in a single plane. This multi-layer current distribution reduces current density by spreading the electrical load across a larger three-dimensional volume.
3Area of stationary object
If smaller footprint designs are used, then space is reduced, but thermal management becomes more difficult
Solution Approach 1:
The thermal management function is segmented and distributed through the PCB structure. The slotted portions extending through multiple conductive layers create distributed thermal pathways, allowing heat from surface-mounted inductors to conduct through the PCB substrate and dissipate across multiple layers, effectively managing thermal loads within a compact footprint.
4Reliability
If slotted portions extend through multiple layers, then electrical interconnection is improved, but manufacturing complexity increases
Solution Approach 1:
The slotted portions serve multiple functions simultaneously: they provide mechanical support for inductor leads, establish electrical connections between multiple conductive layers, and create thermal conduction pathways. This multi-functionality reduces the need for separate manufacturing steps for each function, thereby reducing overall manufacturing complexity despite the multi-layer structure.
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 reduces the PCB footprint, enhances thermal rigidity, and improves reliability by maintaining mechanical stability and thermal performance, allowing for higher continuous maximum operation temperatures and better heat dissipation.
Implementation Method 1
The at least one slotted portion is at least partially plated with copper that electrically interconnects the two or more electrically conductive layers that the at least one slotted portion extends through
Implementation Method 2
one or more of the insulative layers is a prepreg layer that is halogen-free
Data Source
AI summary
A printed circuit board (PCB) assembly is provided. The PCB assembly comprises a printed wiring board (PWB) and one or more electrical components mounted thereon. The PWB comprises a plurality of layers including conductive layers and insulative layers, where one or more of the insulative layers is a prepreg layer that is halogen-free; one or more slotted portions on a surface of the PWB, which are indented into the PWB; and one or more pads disposed on the surface of the PWB, which are paired with the one or more slotted portions. Each of the one or more electrical components is mounted on the surface of the PWB through a pair of a slotted portion and a pad.