Switching Regulator Wiring Layout for Parasitic Inductance Reduction
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Solution Overview
Problem
Switching regulators generate significant high-frequency noise due to parasitic inductance, which affects nearby electronic components and is difficult to mitigate without increasing device size or manufacturing costs.
Innovation Solution
The configuration of a switching regulator includes a first wiring portion coupling the high-side and low-side elements and a second wiring portion coupled with the low-side element, arranged in a manner that reduces effective inductance by having opposite current directions in specific regions, thereby minimizing high-frequency noise without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional wiring layout is used in switching regulator, then device size can be reduced, but parasitic inductance increases causing high-frequency noise
Solution Approach 1:
The patent applies the inversion principle by arranging wiring portions to carry currents in opposite directions in adjacent regions. Specifically, the first wiring portion carrying current in one direction is positioned adjacent to a second wiring portion carrying current in the opposite direction, causing their magnetic fields to cancel each other out. This reduces parasitic inductance and high-frequency noise without requiring additional components or increasing device size.
Solution Approach 2:
The patent merges the functions of multiple wiring portions into a compact arrangement where the first and second wiring portions are closely positioned and carry opposite currents. This combining approach allows the noise reduction function to be achieved within the existing device footprint, effectively reducing parasitic inductance without increasing overall device volume.
2Object-affected harmful factors
If parasitic inductance is reduced by adding components, then high-frequency noise decreases, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent makes the wiring portions serve multiple functions: they perform their primary function of carrying current between circuit nodes while simultaneously functioning as noise reduction elements through their opposite-current arrangement. This multi-functionality eliminates the need for separate noise reduction components, thereby reducing device complexity and manufacturing cost while still achieving high-frequency noise reduction.
Solution Approach 2:
The wiring portions themselves provide the noise reduction function through their own configuration and current directions, without requiring external noise reduction components. The first and second wiring portions use their own opposite currents to cancel magnetic fields and reduce parasitic inductance, making the system self-sufficient in addressing the high-frequency noise problem.
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 approach effectively reduces high-frequency noise generation, allowing for a more compact and cost-efficient electronic device with improved electromagnetic interference (EMI) performance and power conversion efficiency.
Implementation Method 1
a direction of an electric current flowing the first wiring portion at each of the transition period and the OFF period and a direction of an electric current flowing the second wiring portion at each of the transition period and the OFF period are opposite to each other
Data Source
AI summary
An electronic device comprises a switching regulator. Here, the switching regulator has a first wiring portion (including a parasitic inductance) coupling the high-side element and the low-side element, and a second wiring portion (including a parasitic inductance) coupled with the low-side element. Also, the switching regulator has a first region in where the first wiring portion and the second wiring portion are lined up with each other. As a result, the performance of the electronic device can be improved.