Vehicle Electrical System Central Power Low-Pass Filter EMC Design
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Solution Overview
Problem
The high number of components in vehicle electrical systems leads to significant costs associated with electromagnetic compatibility (EMC) filtering, as multiple filters are required to suppress and prevent interference, necessitating a cost-effective EMC-compatible design.
Innovation Solution
A vehicle electrical system utilizing a power low-pass filter as a central filter, connecting a first section with an AC charging terminal to a second section with the energy store, where a DC charging terminal is connected directly to the energy store without additional filters, and additional filters are used for other components to attenuate interference, optimizing filter design and reducing overall costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple filters are used to connect each component to suppress interference, then electromagnetic compatibility is improved, but system cost increases significantly
Solution Approach 1:
The patent merges multiple individual component filters into a single central power low-pass filter that serves the entire first electrical system section. This central filter connects the first section (containing AC charging terminal and other components) to the second section (containing energy store), replacing what would otherwise require multiple separate filters for each component, thereby reducing filter quantity while maintaining EMC performance
Solution Approach 2:
The central power low-pass filter performs multiple functions simultaneously: it filters interference from the AC charging terminal, filters interference from other components in the first section, and provides a common filtering interface between the two electrical system sections. This multi-functional approach eliminates the need for separate dedicated filters for each component
2Device complexity
If a central power low-pass filter is used to connect the two sections, then the number of filters is reduced, but interference attenuation effectiveness may be compromised
Solution Approach 1:
The patent introduces a specifically designed power low-pass filter as an intermediary component between the first and second electrical system sections. This intermediary filter is positioned strategically to block high-frequency switching pulses and interference from propagating between sections, while allowing normal power transmission. The filter acts as a mediator that protects both sections from each other's interference without requiring direct shielding or additional filters at each component
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 effectively reduces costs by using a central power low-pass filter to attenuate interference from the inverter and other components, while allowing DC charging terminals to connect directly to the energy store without additional filters, thereby minimizing overall filter requirements and interference, achieving efficient EMC compatibility.
Implementation Method 1
a power low-pass filter (as central filter) connects a first section of the vehicle electrical system to a second section of the vehicle electrical system
Data Source
AI summary
A vehicle electrical system is equipped with an energy store, a DC charging terminal and an AC charging terminal. The vehicle electrical system also has a power low-pass filter. The power low-pass filter connects a first section of the vehicle electrical system to a second section of the vehicle electrical system. The DC charging terminal is provided in the second section. The AC charging terminal is provided in the first section.