Circuit Board Ground Bridge for Noise and Heat Control
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Solution Overview
Problem
Existing circuit boards face challenges in suppressing electromagnetic noise and heat conduction from high-frequency circuit units to a conductive housing, leading to increased noise levels and uncomfortable temperatures.
Innovation Solution
A circuit board design featuring a ground portion with a slit and a ground bridge that electrically connects between the slit and the screw insertion hole, allowing for controlled heat dissipation and reduced electromagnetic noise by providing a shorter return path for ground currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a continuous ground portion is provided on the circuit board, then electromagnetic noise is suppressed, but heat is conducted from the circuit unit to the housing
Solution Approach 1:
The ground portion is divided into two separate ground portions by introducing a slit between the circuit unit and the screw insertion hole. This segmentation interrupts the thermal conduction path from the circuit unit to the housing while maintaining electromagnetic shielding through the ground bridge connection.
Solution Approach 2:
A ground bridge is introduced as an intermediary element to connect the two ground portions. This ground bridge provides a low-impedance path for high-frequency return currents (suppressing electromagnetic noise) while having minimal thermal conduction due to its narrow width, thus mediating between the conflicting requirements of electromagnetic shielding and thermal isolation.
2Temperature
If the ground portion is divided into separate portions, then heat conduction to the housing is suppressed, but electromagnetic noise increases
Solution Approach 1:
The ground bridge serves as an intermediary connection between the two separated ground portions. It provides an effective return path for high-frequency ground currents, suppressing electromagnetic noise, while its narrow width minimizes thermal conduction, thus resolving the contradiction between thermal isolation and electromagnetic shielding.
Solution Approach 2:
The ground bridge has different functional requirements at different locations: it needs to provide low-impedance electrical connection for high-frequency signals while maintaining high thermal resistance. The narrow width configuration optimizes this local quality by prioritizing electrical connectivity over thermal conductivity in this specific region.
3Temperature
If a ground bridge with narrow width is provided, then heat conduction is suppressed, but manufacturing precision requirements increase
Solution Approach 1:
The ground bridge width is optimized to a specific narrow dimension that provides sufficient electrical connectivity for suppressing electromagnetic noise while minimizing thermal conduction. This parameter optimization balances the conflicting requirements of heat suppression and manufacturing feasibility.
Solution Approach 2:
The ground bridge is formed as an integrated part of the ground portion pattern on the circuit board, combining the functions of electrical connection and thermal isolation in a single structural element. This integration simplifies manufacturing by eliminating the need for separate components or complex assembly processes.
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
Effectively suppresses electromagnetic noise and heat conduction from high-frequency circuit units to the housing, reducing noise levels by 10 dB in the MHz range and maintaining user comfort by managing heat dissipation.
Implementation Method 1
The ground portion has a ground bridge that electrically connects a portion of the ground portion between the slit and the screw insertion hole and a portion of the ground portion between the slit and the predetermined circuit unit
Implementation Method 2
The ground portion has a slit disposed between the screw insertion hole and the predetermined circuit unit
Data Source
AI summary
A circuit board is a circuit board on which a predetermined circuit unit that causes heat and electromagnetic noise is disposed, and which is to be fixed to a conductive housing with a conductive screw. The circuit board includes: an insulator layer including an insulating plate-shaped base material; a conductor layer having a circuit pattern including a ground portion, which is disposed on at least one surface of the insulator layer; and a screw insertion hole that penetrates the insulator layer and the ground portion, and through which the conductive screw is to be inserted. The ground portion has a slit disposed between the screw insertion hole and the predetermined circuit unit. The ground portion has a ground bridge that electrically connects a portion of the ground portion between the slit and the screw insertion hole and a portion of the ground portion between the slit and the predetermined circuit unit.