Switch Module for Selective Ground Wiring Isolation
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Solution Overview
Problem
In motor driving apparatuses, poor ground environments can lead to electrical instability and reliability issues due to electromagnetic compatibility (EMC) and conduction noise being introduced between the EMC filter and inverter through shared ground wiring, degrading the performance of the apparatus.
Innovation Solution
A board apparatus with a printed circuit board, an EMC filter, and an inverter, featuring a switch module that selectively interrupts the connection between ground wirings using a conductive bolt and nut configuration with an insulating member to isolate the EMC filter and inverter, allowing for adaptive grounding based on the ground environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a typical insulating ground supply is used to provide electrical stability, then electrical stability is improved, but ground wiring of EMC filter and inverter may be electrically connected through the ground supply in poor ground environments, causing EMC and conduction noise to be introduced
Solution Approach 1:
The ground supply's electrical connection state is made dynamic rather than fixed. The control module dynamically switches between first and second ground supplies based on detected ground environment quality, allowing the system to adapt between connected and disconnected states to prevent noise introduction while maintaining electrical stability.
Solution Approach 2:
The system changes the electrical connection parameter of the ground supply based on ground environment conditions. By detecting ground quality and switching between different ground supply configurations, the system adjusts the connection state parameter to prevent harmful noise introduction while maintaining necessary electrical stability.
2Object-affected harmful factors
If a switch is added to interrupt the connection between ground wirings to prevent noise introduction, then noise immunity is improved, but device complexity increases
Solution Approach 1:
The control module automatically detects ground environment quality and autonomously switches between ground supply configurations without manual intervention. This self-service capability simplifies operation while maintaining the necessary switching functionality to prevent noise introduction.
Solution Approach 2:
The system incorporates a detection mechanism that monitors ground environment quality and provides feedback to the control module. Based on this feedback, the control module automatically adjusts the ground supply connection state, creating a closed-loop control system that prevents noise introduction while managing complexity through intelligent automation.
Data Source
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AI summary
Disclosed herein is a board apparatus including a printed circuit board 101, including a first ground wiring 111 disposed on one surface of the printed circuit board; a second ground wiring 121 disposed on the other surface of the printed circuit board; and a switch module 130 disposed in an overlapped region between the first ground wiring and the second ground wiring, and including a bolt 131 which penetrates through the printed circuit board and a nut 132 which is in contact with the second ground wiring and is coupled to a screw 1311 of the bolt. The switch module further includes an insulating member 133 disposed between a head 1312 of the bolt and the first ground wiring to interrupt the connection between the first and second ground wirings. When the switch module does not include the insulating member, the switch module connects between the first and second ground wirings.