Station Building Power Supply Grounding for High-Frequency Leakage
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Solution Overview
Problem
In station buildings where devices cannot be grounded individually due to installation environments or structural restrictions, high-frequency currents generated by power converters can leak into external electrical apparatuses, causing malfunctions.
Innovation Solution
A station building power supply that includes a power converter, a casing, and a filter circuit, where the power converter and casing are grounded, allowing high-frequency currents to circulate within the system and preventing them from leaking into external electrical apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a shared grounding electrode is used among multiple devices, then installation complexity is reduced and ease of operation is improved, but high-frequency current leakage occurs causing external electrical apparatus to malfunction
Solution Approach 1:
The grounding system is segmented into two distinct paths: a shared grounding electrode for DC equipment (power converter) and a separate grounding terminal for AC equipment (external electrical apparatus). This segmentation prevents high-frequency current generated by the power converter from coupling into the AC system circuit through the grounding path, while still allowing both devices to use a common grounding infrastructure.
Solution Approach 2:
A grounding wire connects the grounding terminal to the shared grounding electrode, serving as an intermediary that provides a dedicated low-impedance path for AC equipment grounding without allowing high-frequency current from the power converter to leak into external AC circuits. The grounding wire acts as a mediator that separates the grounding functions while maintaining electrical connectivity.
2Object-affected harmful factors
If individual grounding is implemented for each device, then high-frequency current leakage is prevented, but installation complexity and difficulty increase
Solution Approach 1:
The patent merges the grounding infrastructure by providing a shared grounding electrode that serves both DC equipment (power converter) and AC equipment (external electrical apparatus). This combining approach reduces the overall number of grounding electrodes needed while maintaining separate grounding paths through the grounding wire connection, thereby reducing installation complexity while preventing high-frequency current leakage.
3Reliability
If power converter and casing are both grounded, then safety and stability are improved, but high-frequency current circulation in loop circuit occurs
Solution Approach 1:
The grounding paths are segmented into separate circuits: the power converter grounding path connects to the shared grounding electrode, while the AC system circuit grounding path connects to the grounding terminal through the grounding wire. This segmentation breaks the loop circuit that would otherwise allow high-frequency current to circulate, while maintaining grounding for both devices to ensure safety and stability.
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
Prevents malfunction of external electrical apparatuses by containing high-frequency currents within the station building power supply, even when a shared grounding electrode is used among devices.
Implementation Method 1
a filter circuit that flows a high-frequency current generated in the power converter from the AC system circuit to the casing
Data Source
AI summary
A station building power supply includes: a power converter that converts DC power to AC power; a casing that houses the power converter; an AC system circuit that supplies the AC power output from the power converter to electrical apparatus outside the casing; and a filter circuit that applies a high-frequency current generated in the power converter from the AC system circuit to the casing. In the station building power supply, the power converter and the casing are grounded.