Circuit Board Module Layout for Ceramic Capacitor Noise Reduction
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Solution Overview
Problem
Ceramic capacitors in electronic devices generate noise due to piezoelectric effects causing vibrations and resonance, leading to noise generation and reduced quality and service life.
Innovation Solution
A circuit board module design with symmetrically arranged capacitors on opposite surfaces and an opening in the middle to reduce noise by minimizing contact area and using air isolation, combined with larger capacitors near standing feet and smaller capacitors farther away.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multilayer ceramic capacitors are used in hybrid flyback circuits, then capacitance requirements are met and circuit functionality is achieved, but piezoelectric effects cause vibrations and resonance generating noise
Solution Approach 1:
The patent employs asymmetric placement of capacitors on the circuit board, specifically positioning capacitors at different locations (e.g., one capacitor closer to the standing feet and another farther away) to create asymmetric vibration patterns that do not resonate with the board structure, thereby reducing noise generation while maintaining circuit functionality
Solution Approach 2:
The patent utilizes the third dimension (vertical height) by placing capacitors at different distances from the standing feet along the vertical axis, creating spatial separation that disrupts the resonance between capacitor vibrations and the circuit board structure, effectively reducing noise while preserving electrical performance
2Reliability
If capacitors are fixed on the circuit board, then circuit functionality is maintained, but contact area between capacitors and board allows noise transmission
Solution Approach 1:
The patent extracts the noise transmission path by introducing air gaps between the capacitors and the circuit board, removing the direct solid contact that facilitates noise transmission while maintaining the electrical connection through the standing feet structure
Solution Approach 2:
The patent introduces air as an intermediary substance between the capacitors and the circuit board, which acts as a noise isolation barrier while allowing the capacitors to remain electrically connected through the standing feet, thus reducing noise transmission without compromising circuit functionality
3Area of stationary object
If larger capacitors are placed near standing feet, then space utilization is optimized, but vibration amplitude increases
Solution Approach 1:
The patent employs asymmetric placement of capacitors with different capacitance values at different distances from the standing feet, creating asymmetric vibration patterns that do not resonate with the board structure, thereby reducing noise generation while maintaining space utilization efficiency
Solution Approach 2:
The patent applies different capacitance values at different locations on the circuit board, with larger capacitors near the standing feet and smaller capacitors farther away, creating local variations in electrical properties that optimize both space utilization and vibration characteristics
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 attenuates vibrations and reduces noise transmission, improving the quality and service life of electronic devices while optimizing space utilization and efficiency.
Implementation Method 1
an alternating voltage will be generated at both ends of the multilayer ceramic capacitor and may cause a piezoelectric effect on the multilayer ceramic capacitor, thereby causing the body of the multilayer ceramic capacitor to vibrate and then occurring resonance
Implementation Method 2
the capacitors are symmetrically fixed on a first surface and a second surface opposite to the first surface of the circuit board... Effectively attenuates vibrations and reduces noise transmission
Implementation Method 3
an opening is formed on the circuit board and located between the capacitors... using air isolation to reduce noise transmission
Data Source
AI summary
A circuit board module includes a circuit board and a plurality of capacitors. The circuit board has a plurality of standing feet for erecting on a main board, and the capacitors are symmetrically fixed on a first surface and a second surface opposite to the first surface of the circuit board. An opening is formed on the circuit board of the circuit board module and the opening is located between the capacitors. In addition, an electronic device adopting the circuit board module design is also disclosed herein.