Filter Circuit Ground Path Using Cable Wire
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Solution Overview
Problem
Filter circuit mounting units on printed circuit boards face challenges in effectively reducing noise propagation from the ground path to the power supply line due to adjacent wiring, which either fails to achieve sufficient noise reduction or requires increased board size by spacing the power supply line and ground path apart.
Innovation Solution
The use of cable wires as ground paths for filter circuits, spaced apart from the printed circuit board, allows for effective noise reduction without increasing the board size, with multiple stages of filter circuits and varying noise levels addressed by different ground path configurations, including cable wires and board-patterned wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the power supply line and ground path are spaced apart to prevent noise propagation, then noise reduction effect is improved, but the size of the printed circuit board increases
Solution Approach 1:
The ground path is moved from the two-dimensional plane of the printed circuit board to the third dimension by using a cable wire that extends vertically from the board surface. This dimensional transition allows the ground path to be spatially separated from the power supply line without increasing the board's footprint area.
Solution Approach 2:
A cable wire serves as an intermediary element connecting the filter circuit to the ground terminal. This cable wire acts as a mediator that carries the ground path outside the board plane, enabling noise suppression while maintaining compact board dimensions.
2Area of stationary object
If the power supply line and ground path are placed adjacent to each other for compact layout, then board size is reduced, but radiation noise propagates from the ground path to the power supply line
Solution Approach 1:
By transitioning the ground path to three-dimensional space using a cable wire, the invention achieves spatial separation from the power supply line in the vertical dimension, thereby preventing radiation noise coupling while maintaining compact two-dimensional board layout.
3Ease of manufacture
If ground paths are formed by patterning on the printed circuit board, then manufacturing is simplified, but noise reduction effectiveness is insufficient due to adjacent wiring constraints
Solution Approach 1:
The cable wire serves as an intermediary that bridges the filter circuit and ground terminal outside the board plane. This approach maintains the simplicity of board-level patterning for other connections while introducing a specialized intermediate element to achieve the noise reduction function.
Solution Approach 2:
The ground path transitions from being confined to the two-dimensional board plane to extending into the third dimension via cable wire, enabling effective noise separation while preserving the simplicity of standard PCB manufacturing processes for other circuit elements.
Data Source
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AI summary
Filter circuit(s) (60, 70) and switching circuit(s) (20, 40) are mounted on a printed circuit board (51). A ground path of the filter circuit (70) is composed of a ground wire (78) arranged so as to be spaced apart from the printed circuit board (51).