Low-Inductance Ground Connection Structure for Vehicle Noise Suppression
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Solution Overview
Problem
Existing ground connection structures in vehicles suffer from noise voltage elevation due to potential drops in the electrically conducting connection parts, which can lead to unstable operation of electrical components.
Innovation Solution
A ground connection structure utilizing a low-inductance material, such as a flat braided wire, for the electrically conducting connection part, which reduces impedance and suppresses noise voltage, while maintaining routing capability and durability through a resin covering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single-core circular wire is used as the electrically conducting connection part, then the routing capability is improved, but the impedance increases causing noise voltage elevation
Solution Approach 1:
The patent changes the physical parameters of the electrically conducting connection part by using flat-shaped conductors instead of circular wires. This geometric parameter change reduces inductance and impedance while maintaining routing flexibility, thereby suppressing noise voltage elevation caused by potential drops.
Solution Approach 2:
The patent employs composite construction by combining flat copper conductors with resin insulation materials. The flat copper provides low impedance and low inductance properties, while the resin covering provides insulation and protection, achieving both electrical performance and routing capability.
2Object-affected harmful factors
If the diameter of the single-core circular wire is increased to reduce impedance, then the noise voltage is suppressed, but the routing capability and flexibility deteriorate
Solution Approach 1:
The patent transitions from circular cross-section to flat cross-section for the conductor. This dimensional change allows achieving low impedance without increasing the overall size, as the flat shape provides larger surface area for current flow while maintaining flexibility for routing in confined spaces.
3Reliability
If multiple connection points are formed in the vehicle body to connect grounding wires directly, then the grounding performance is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent merges multiple grounding wire connections into a single connection point on the vehicle body by using a busbar structure. The flat conductors connect multiple electrical components to a common grounding point, simplifying manufacturing while maintaining effective grounding performance through the low-impedance flat conductor design.
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 low-inductance material significantly reduces impedance, preventing noise voltage rises and ensuring stable operation of electrical components by improving conductivity and flexibility, and protecting the connection part from deterioration.
Implementation Method 1
the electrically conducting connection part is made of a low-inductance material having low inductance
Implementation Method 2
the low-inductance material may be covered with a covering member made of resin
Data Source
AI summary
A ground connection structure is a structure for collectively connecting, to a body of a vehicle, a plurality of grounding wires which are connected to respective electrical components installed in the vehicle. The ground connection structure includes: a connection box to which the plurality of grounding wires are connected; a grounding terminal part connected to the vehicle in an electrically conducting state; and an electrically conducting connection part having one end connected to the connection box and the other end connected to the grounding terminal part, the electrically conducting connection part connecting the connection box and the grounding terminal part in an electrically conducting manner. The electrically conducting connection part is made of a low-inductance material having low inductance.