Quick-Charging Line Grounding With Y-Capacitors for Noise Reduction
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Solution Overview
Problem
Quick-charging systems for vehicles lack effective noise countermeasures, leading to potential noise influx from circuits like DC/DC converters and air-conditioning compressors during charging, which can disrupt the system.
Innovation Solution
A charging apparatus with a quick-charging line equipped with a first noise filter, such as Y capacitors, connected to the line between the battery and noise sources, and grounded at a neutral point to reduce noise influx.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a quick-charging line is used to supply large DC power to the storage battery, then charging speed is improved, but noise from circuits like DC/DC converters and air-conditioning compressors flows into the quick-charging system
Solution Approach 1:
A common ground line is introduced as an intermediary connection between the vehicle body ground and the quick-charging system ground. This mediator provides a dedicated noise return path that prevents noise from circuits like DC/DC converters and air-conditioning compressors from flowing into the quick-charging system while maintaining high-speed charging capability.
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 adding complex noise filters to the quick-charging line, a common ground line is introduced as a simple intermediary structure. This approach reduces noise through proper grounding without increasing device complexity, as the ground line is a fundamental component already present in the system architecture.
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
Reduces noise flowing into the quick-charging system, preventing electric shocks and maintaining system integrity during both quick and normal charging modes.
Implementation Method 1
a Y capacitor that eliminates noise
Implementation Method 2
The switch is configured to connect and disconnect the intermediate grounding conductor
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).