Capacitor Axis Orthogonal Arrangement for PCB Noise Suppression
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Solution Overview
Problem
Existing methods for reducing noise generated by laminated ceramic capacitors on printed circuit boards, such as those described in Japanese Patent Applications 2002-232110, 2004-273935, and 2003-324030, face limitations in applicability due to strict arrangement and phase adjustments requirements, increased capacitor size, and manufacturing costs, especially in portable devices with limited mounting space.
Innovation Solution
A novel arrangement structure for laminated ceramic capacitors on a printed circuit board, where four capacitors are mounted with their axes intersecting at right angles, forming two pairs of series-connected capacitors, allowing for effective noise suppression without the need for double-side mounting, thus reducing manufacturing costs and increasing applicability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional noise reduction methods are used (alignment and phase adjustment), then noise suppression is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the geometric arrangement parameter of capacitors from traditional aligned configurations to an orthogonal arrangement where capacitor axes intersect at right angles. This parameter change eliminates the need for precise phase adjustment while maintaining noise suppression effectiveness, thereby reducing manufacturing complexity
Solution Approach 2:
The patent employs asymmetric arrangement of capacitors with their axes intersecting at right angles rather than symmetric aligned configurations. This asymmetric geometry creates inherent phase differences that achieve noise cancellation without requiring additional phase adjustment mechanisms, simplifying manufacturing
2Object-affected harmful factors
If double-side mounting is used, then noise reduction is improved, but mounting space requirements increase
Solution Approach 1:
The patent transitions from planar arrangement of capacitors to a three-dimensional orthogonal arrangement where capacitor axes intersect at right angles. This dimensional change enables effective noise suppression to be achieved on a single side of the PCB, eliminating the need for double-side mounting and reducing mounting space requirements
3Object-affected harmful factors
If precise phase adjustment is required, then noise cancellation is effective, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the geometric configuration parameter to orthogonal arrangement, which inherently produces the necessary phase differences for noise cancellation. This eliminates the need for precise phase adjustment during manufacturing, reducing manufacturing precision requirements while maintaining effective noise cancellation
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
This arrangement effectively suppresses noise on a single-side mounted printed circuit board, reducing vibrations and noise generation, while allowing for broader application in devices with limited space, such as portable computers, without the need for complex phase adjustments or increased capacitor size.
Implementation Method 1
The ceramic materials used in ceramic capacitors exhibit ferroelectric properties and so-called piezoelectric or electrostriction such that the ceramic materials are mechanically deformed when an electric voltage is applied to both ends of the capacitor.
Implementation Method 2
The ceramic materials used in ceramic capacitors exhibit ferroelectric properties and so-called piezoelectric or electrostriction such that the ceramic materials are mechanically deformed when an electric voltage is applied to both ends of the capacitor.
Implementation Method 3
When the voltage of an audible frequency range superimposed on the DC voltage is applied to the decoupling capacitor, the capacitor exhibits a reverse piezoelectric effect in response to an alternating component of the electric field, so that the capacitor's body resonates with its natural frequency and vibrates.
Implementation Method 4
Therefore, when laminated ceramic capacitors are mounted on a printed circuit board (PCB) as decoupling capacitors, the capacitors' vibrations are transmitted to the PCB and generate noise.
Data Source
AI summary
Embodiments of the present invention provide an arrangement structure capable of reducing noise caused by a laminated ceramic capacitor mounted on a printed circuit board. A unit arrangement structure includes ceramic capacitors. Among the laminated ceramic capacitors, capacitors are arranged so that capacitor axes thereof extend along a first axis, while the other ceramic capacitors are arranged so that capacitor axes thereof extend along a second axis crossing the first axis. In accordance with such an arrangement structure, it is possible to effectively suppress noise even in the case of single-side mounting.