EV Quick-Charging Line Filter Layout for Noise Suppression
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Solution Overview
Problem
The quick-charging system for electric vehicles lacks a noise countermeasure, leading to potential noise interference from circuits like the DC/DC converter and air-conditioning compressor during charging.
Innovation Solution
Incorporating a first noise filter on the quick-charging line that connects the battery to noise-generating components, redirecting noise to the body ground through Y capacitors, thereby reducing noise influx into the quick-charging system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a quick-charging system is used to supply large DC power to the storage battery, then charging speed is improved, but noise may occur from circuits like DC/DC converter and flow into the quick-charging system
Solution Approach 1:
A noise filter is introduced as an intermediary component between the quick-charging line and the vehicle body ground. This filter acts as a mediator that allows the quick-charging system to operate at high speed while simultaneously blocking noise generated by vehicle circuits from flowing into the charging system, thus resolving the contradiction between charging speed and noise reduction
2Object-generated harmful factors
If a noise filter is added to the quick-charging line, then noise reduction is achieved, but device complexity increases
Solution Approach 1:
Instead of implementing a complex noise filtering system throughout the entire quick-charging infrastructure, the solution applies a localized noise filter only at the specific point where the quick-charging line connects to the vehicle. This targeted approach reduces noise effectively while minimizing the increase in device complexity by limiting the filtering component to only where it is most needed
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 minimizes noise entering the quick-charging system, preventing electrical shocks and ensuring compliance with leakage current standards.
Implementation Method 1
Y capacitors that eliminate noise
Implementation Method 2
redirecting noise to the body ground through Y capacitors
Data Source
AI summary
Provided are a charging device and a vehicle capable of reducing the amount of noise flowing into a quick-charging facility. The pair of charging lines connecting the quick-charging facility (20) to an onboard battery (30) are referred to as quick-charging lines, and each of these quick-charging lines is provided with a relay (16-1, 16-2). Each relay (16-1, 16-2) is used to switch the current flowing in the respective quick-charging line on and off, the current being switched on during quick-charge and being switched off during normal charging. Each quick-charging line has a Y-capacitor (17) connected thereto closer to a QC port (15) than the respective relay (16-1, 16-2).