EV Charging Input Filter Layout for Stable Multi-Phase Suppression

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Solution Overview

Problem

Conventional charging devices for electric vehicles face challenges in maintaining consistent filter properties to suppress interfering signals across different phase configurations, leading to suboptimal filtering and increased component size, weight, and cost.

Innovation Solution

The filter means is positioned directly at the input connection of the charging device, comprising capacitive and inductive components arranged in specific configurations to maintain constant filtering properties regardless of the phase selection, optimizing component design and minimizing dimensions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the filter means is positioned after the switching means (conventional arrangement), then the filter properties vary depending on phase selection, but the component design becomes more complex and larger

Engineering Contradiction:

Improvefiltering consistencyVSAvoidfilter configuration complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The filter means is positioned at the input connection before the switching means, performing filtering action in advance. This preliminary filtering ensures that regardless of which phases are selected by the switching means, the interfering signals are already filtered, maintaining consistent filter properties across all phase configurations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The conventional arrangement places the filter after the switching means, but this invention inverts the sequence by placing the filter before the switching means. This inversion resolves the technical contradiction by ensuring that the filter operates on all input phases uniformly, eliminating the variability in filter properties that occurs with different phase selections.

Inventive Principle:

Principle #13The other way round (Inversion)

2Object-affected harmful factors

If the filter means is positioned after the switching means, then filtering can be phase-specific, but component size, weight, and cost increase

Engineering Contradiction:

Improveinterfering signal suppressionVSAvoidcharging device weight

Core Design Contradiction:

Object-affected harmful factorsVSWeight of stationary object

Solution Approach 1:

The filter means positioned at the input connection serves all phase configurations (single-phase and multi-phase) with a single universal filter design. This eliminates the need for multiple phase-specific filter configurations, reducing the overall component size, weight, and cost while maintaining effective interfering signal suppression across all operating modes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The filter means combines the filtering function for all phases into a single integrated component arrangement at the input connection, rather than having separate filter components for each phase configuration. This merging reduces the total component count, minimizing weight and construction volume while maintaining filtering effectiveness.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If the filter means is positioned after the switching means, then filtering adapts to phase selection, but construction volume increases

Engineering Contradiction:

Improveinterference suppression reliabilityVSAvoidcharging device volume

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

By performing filtering at the input connection before phase selection, the filter needs to handle only the incoming signals once, rather than requiring redundant filtering capabilities for each possible phase configuration. This preliminary action reduces the total filter component volume while maintaining reliable interference suppression.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Inverting the conventional sequence places the filter before the switching means, allowing a single compact filter design to serve all phase configurations. This eliminates the volume penalty associated with having multiple filter configurations, reducing construction volume while maintaining suppression reliability.

Inventive Principle:

Principle #13The other way round (Inversion)

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 configuration enhances filtering efficiency, reduces costs, and minimizes weight and construction volume while ensuring consistent suppression of interfering signals across single-phase and multi-phase charging operations.

Implementation Method 1

The filter means is configured to filter out electrical interfering signals on the electrical connections between the input connection and the output connection

Methodology Applied

Scientific EffectElectrical filtering: Filter (electronic)

Data Source

PatentUS12187144B2Connection device for a device for charging an electrical energy accumulator, charging device and electric vehicle

Publication Date: 2025.01.07 ROBERT BOSCH GMBH

AI summary

The present invention relates to the connection of a charging circuit for charging an electrical energy accumulator by means of a single-phase or multi-phase electrical alternating voltage. To this end, a filter means for suppressing interfering signals is provided at an input before a switchover between a single-phase or multi-phase charging process. In this way, the properties, in particular the capacitive properties, of the filter means are not influenced by the circuit configuration at the switchover between single-phase or multi-phase charging.