Power Module Layout Using Opposing Magnetic Fields to Cut EMI

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Solution Overview

Problem

The increasing complexity and rated power of power modules lead to significant electromagnetic interference issues, reducing efficiency and reliability in power conversion systems.

Innovation Solution

A power apparatus design featuring staggered first and second power circuits with parallel conductive components on separate metallization regions, offsetting magnetic fields to cancel electromagnetic interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the rated power and complexity of power modules are increased, then the power conversion capability is improved, but electromagnetic interference problems worsen

Engineering Contradiction:

Improverated powerVSAvoidelectromagnetic interference

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The patent utilizes the harmful magnetic fields generated by high-power switching circuits and converts them into beneficial effects by arranging opposing current paths that generate counteracting magnetic fields. The EMI-filterless design leverages the magnetic fields that would normally cause interference to instead cancel each other out, transforming the harmful electromagnetic radiation into a useful noise-cancellation mechanism.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The power module circuit is segmented into multiple independent current paths with alternating polarity arrangements. By dividing the circuit into separate switching units with opposing magnetic field orientations, the patent enables each segment to generate its own magnetic field that counteracts adjacent segments, thereby reducing overall electromagnetic interference while maintaining high power capability.

Inventive Principle:

Principle #1Segmentation

2Productivity

If conventional circuit configurations are used in high-power modules, then power conversion is achieved, but electromagnetic interference reduces system efficiency and reliability

Engineering Contradiction:

Improvepower conversion efficiencyVSAvoidsystem reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent converts the harmful electromagnetic interference that normally reduces reliability into a beneficial cancellation effect. By designing opposing current paths that generate counteracting magnetic fields, the system transforms EMI from a reliability-damaging factor into a protective mechanism that enhances system stability and reduces electromagnetic radiation.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

Reduces electromagnetic interference by opposing magnetic fields generated by conductive components, enhancing system efficiency and reliability.

Implementation Method 1

opposing magnetic fields generated by conductive components

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS12587093B2Power apparatus with electromagnetic interference reduction function

Publication Date: 2026.03.24 SENTEC E&E CO LTD

AI summary

A power apparatus includes a substrate, a first power circuit, and a second power circuit. The substrate includes a first metallization region, a second metallization region, and a third metallization region which are separated from each other. The first power circuit is electrically connected to the first metallization region and the third metallization region, and is arranged across the second metallization region and fails to be in contact with the second metallization region. The second power circuit is electrically connected to the second metallization region and the third metallization region, and fails to be in contact with the first metallization region.