Input Port Cover PI Filter for Compact Power Conversion

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Solution Overview

Problem

Existing electric power conversion devices face challenges in filtering high-frequency bands while maintaining a compact size due to the need for additional noise filter elements, which typically increase the device's size.

Innovation Solution

The integration of capacitors within an input port cover of the electric power conversion device, utilizing a bus bar system with high-voltage and ground bus bars, and a cover housing to accommodate capacitors without increasing the device's size, forming a PI filter that filters high-frequency bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If additional noise filter elements are added to filter high-frequency bands, then electromagnetic compatibility is improved, but the device size increases

Engineering Contradiction:

Improveelectromagnetic compatibilityVSAvoiddevice size

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

The patent combines the noise filtering function with the existing input port cover structure. Capacitors are integrated into the cover that already houses the bus bar, merging two functions (structural covering and noise filtering) into a single component assembly, thereby avoiding additional space requirements

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The input port cover is designed to serve multiple functions: it provides structural protection for the bus bar, seals the input port, and simultaneously serves as a mounting structure for capacitors that perform high-frequency noise filtering. This multi-functional design eliminates the need for separate filtering components

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Effectively filters high-frequency electromagnetic waves while maintaining the device's size by integrating capacitors in the input port cover, enhancing electromagnetic compatibility without enlarging the device.

Implementation Method 1

capacitors provided between the end and the remaining end of the bus bar

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

a filter configuration that may (e.g., effectively) filter a high-frequency band

Methodology Applied

Scientific EffectElectromagnetic filtering: Filter (electronic)

Data Source

PatentUS20260040477A1Electric Power Conversion Device

Publication Date: 2026.02.05 HYUNDAI MOTOR CO LTD

AI summary

Disclosed is an electric power conversion device including an input port configured such that external power is input thereto through input terminals, and an input port cover provided at one end of the input port to seal the end of the input port and including a bus bar having one end in contact with the input terminals and a remaining end grounded, and capacitors provided between the end and the remaining end of the bus bar.