Segmented Shielding for Electrical Connecting Device Ground Loops
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Solution Overview
Problem
Electrical connecting devices in motor vehicles can create ground loops due to uncontrolled currents flowing across shields, leading to electromagnetic compatibility issues and potential damage when there are defects in the ground connection, especially when transmitting high-voltage energy.
Innovation Solution
An electrical connecting device with bidirectional shielding, where the first shielding device is connected to the first housing and the second shielding device is connected to the second housing, and both are electrically isolated from each other, preventing undesired current flow and thus avoiding ground loops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a single shield is connected to reference potential at both ends of the cable, then electromagnetic shielding is provided, but ground loops are created causing uncontrolled currents and electromagnetic compatibility issues
Solution Approach 1:
The single continuous shield is segmented into a first shield portion at the transmitting end and a second shield portion at the receiving end. These portions are electrically isolated from each other, breaking the ground loop path while maintaining local shielding effectiveness at each end of the cable.
Solution Approach 2:
The problematic continuous connection between shield portions is extracted/removed. Instead of a single connected shield, separate shield portions are used that are not electrically connected, eliminating the ground loop formation while preserving the shielding function against electromagnetic interference.
2Power
If high-voltage energy is transmitted through the cable, then energy transmission capability is improved, but the risk of damage from uncontrolled currents increases
Solution Approach 1:
The shield system is segmented into isolated portions that cannot conduct uncontrolled currents across the entire cable length. This segmentation prevents high-voltage damage by limiting current paths to localized areas only, while the cable maintains its high-power transmission capability through the conductor.
Solution Approach 2:
Electrical insulation acts as an intermediary between the first and second shield portions, preventing direct electrical connection. This intermediary element blocks uncontrolled current flow while allowing the cable to transmit high-voltage energy through the insulated conductor core.
3Object-affected harmful factors
If the first shield portion is electrically connected to the first housing and the second shield portion to the second housing, then local shielding effectiveness is improved, but ground loops are formed between housings
Solution Approach 1:
The shield is divided into separate portions that are locally connected to respective housings but electrically isolated from each other. This segmentation provides effective local shielding at each housing interface while preventing the formation of ground loops between housings through the electrical insulation between shield portions.
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 solution effectively prevents ground loops and uncontrolled current flow, ensuring safe and reliable transmission of energy and data between electrical components, even in high-voltage applications, by isolating the shielding devices and reducing electromagnetic interference.
Implementation Method 1
the electrical connecting device has a first shielding device for shielding the electrical conductor, wherein the first shielding device can be electrically connected to the first housing, and a second shielding device for shielding the electrical conductor, wherein the second shielding device can be electrically connected to the second housing
Data Source
AI summary
An electrical connecting device includes an electrical conductor configured to transmit at least one of electrical energy and data between a first electrical component, which is arranged in a first housing that is electrically connected to a reference potential, and a second electrical component, which is arranged in a second housing that is electrically connected to the reference potential. The electrical connecting device also includes a first shielding device configured to shield the electrical conductor, wherein the first shielding device is electrically connected to the first housing, and a second shielding device configured to shield the electrical conductor, wherein the second shielding device is electrically connected to the second housing. The first shielding device is electrically isolated from the second shielding device.