Vehicle On-Board EMC Filter Layout for Inverter-Battery Links
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing on-board electrical systems in vehicles face challenges in achieving electromagnetic compatibility (EMC) due to unshielded connections between high-voltage components like inverters and batteries, leading to electromagnetic interference issues.
Innovation Solution
The integration of an EMC filter device with a common-mode and differential-mode filter stage, connected via shielded and unshielded external connections, along with electromagnetic shielding, to suppress electromagnetic interference and comply with EMC standards without modifying existing components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If unshielded connections are used between inverter and battery, then device complexity is reduced and ease of manufacture is improved, but electromagnetic interference increases and EMC compliance deteriorates
Solution Approach 1:
An EMC filter device is introduced as an intermediary component between the inverter and battery connections. This filter device includes common-mode and differential-mode filter stages that actively suppress electromagnetic interference while allowing legitimate electrical signals to pass through, thus resolving the contradiction between ease of manufacture and electromagnetic compatibility
Solution Approach 2:
The electrical parameters of the connection system are modified by adding filtering components that change the impedance characteristics and frequency response of the connections. This allows the system to maintain manufacturability while fundamentally altering the electromagnetic behavior to reduce interference
2Reliability
If shielded connections and EMC filter device are added, then electromagnetic compatibility is improved, but device complexity and cost increase
Solution Approach 1:
The EMC filtering function is segmented into distinct common-mode and differential-mode filter stages within the filter device. This segmentation allows each stage to address specific types of electromagnetic interference independently, improving overall EMC effectiveness while keeping individual stages relatively simple and manageable
Solution Approach 2:
The EMC filter device is designed to perform multiple functions simultaneously: it filters common-mode interference, filters differential-mode interference, and provides a standardized interface for connection. This multi-functionality reduces overall system complexity by consolidating multiple potential components into a single integrated device
3Object-affected harmful factors
If existing components are modified to add shielding, then electromagnetic interference is reduced, but ease of manufacture and adaptability decrease
Solution Approach 1:
The EMC filtering and shielding functionality is extracted from the existing inverter and battery components and placed into a separate, dedicated EMC filter device. This extraction allows the original components to remain unchanged and adaptable, while the separate filter device provides the necessary electromagnetic interference suppression
Solution Approach 2:
The EMC filter device serves as an intermediary that connects to existing components without requiring modifications to them. This intermediary approach preserves the adaptability and versatility of the original inverter and battery components while still achieving electromagnetic compatibility through the filtering provided by the intermediate device
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
The solution effectively suppresses electromagnetic interference, ensuring compliance with EMC requirements and allowing for flexible installation and cross-platform reuse of existing electrical systems.
Implementation Method 1
The EMC filter device or a housing of the EMC filter device has at least one electromagnetic shield. Furthermore, a shield is provided for the at least one primary external connection
Implementation Method 2
The EMC filter device has a common-mode filter stage and a differential-mode filter stage. Both of these stages mentioned are connected in series within the housing
Implementation Method 3
the internal connections, usually two, connected in parallel in the EMC filter device are connected to one another via at least one Class X capacitance as an electrical filter component. Alternatively or additionally, at least one, usually every, internal connection is connected to the housing of the EMC filter device via a Class Y capacitance as an electrical filter component
Implementation Method 4
Furthermore, alternatively or additionally, at least one inductance, e.g., a self-inductance, is associated with at least one internal connection as an electrical filter component
Data Source
AI summary
The disclosure relates to a system for an on-board electrical system of a vehicle, wherein the on-board electrical system has an inverter and a battery. The system has at least one primary shielded external electrical connection and an electromagnetic compatibility (EMC) filter device, wherein the EMC filter device is connected to the inverter via the at least one primary shielded external electrical connection and, wherein the EMC filter device is connected to the battery via at least one secondary external electrical connection.