Circuit Board Intersecting Inductors Non-Right Angle Parasitic Cancellation
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Solution Overview
Problem
Existing filter circuits face challenges in effectively canceling parasitic inductance of capacitors due to manufacturing variations, which affects noise reduction effects in high frequency bands, especially when using impedance converter circuits.
Innovation Solution
A circuit board design incorporating intersecting inductance elements with non-right angle wire configurations to minimize the impact of manufacturing variations on parasitic inductance cancellation, ensuring effective noise reduction across high frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an impedance converter circuit is used to cancel parasitic inductance of a capacitor, then the noise reduction effect is improved, but the circuit becomes sensitive to manufacturing variations in the circuit board
Solution Approach 1:
The patent applies asymmetry by configuring the inductance elements with non-orthogonal intersecting wires at specific angles (e.g., 45 degrees) rather than perpendicular arrangements. This asymmetric geometric configuration reduces sensitivity to manufacturing variations while maintaining effective parasitic inductance cancellation, directly resolving the contradiction between noise reduction performance and manufacturing precision sensitivity
Solution Approach 2:
The patent changes the geometric parameters of the inductance elements, specifically setting the intersection angle of wires to non-orthogonal values (e.g., 45 degrees) and optimizing wire dimensions. These parameter modifications enable the circuit to maintain stable parasitic inductance cancellation performance across manufacturing variations, addressing both noise reduction effectiveness and manufacturing tolerance sensitivity
2Object-affected harmful factors
If the parasitic inductance is canceled by using an impedance converter circuit, then the filter circuit performance is improved, but the circuit complexity increases
Solution Approach 1:
The patent merges the inductance elements directly into the circuit board structure rather than using separate discrete components. The inductance elements are formed by wire configurations integrated into the PCB layout, combining the filtering function with the circuit board structure itself, thereby reducing overall circuit complexity while maintaining parasitic inductance cancellation capability
Solution Approach 2:
The patent uses planar wire patterns on the circuit board to create inductance elements that replicate the electrical characteristics of traditional discrete inductors. By copying the inductance function through PCB trace configurations rather than physical inductor components, the design simplifies the circuit while achieving the required parasitic inductance compensation
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
The design significantly reduces the influence of manufacturing variations on noise reduction effects in high frequency bands by ensuring that the intersecting inductance elements maintain effective negative inductance cancellation, even with deviations in lamination, thereby improving the overall noise reduction performance.
Implementation Method 1
a noise reduction effect deteriorates due to equivalent series inductance (ESL) that is parasitic inductance of the capacitor... the parasitic inductance of the capacitor is to be canceled by using the impedance converter circuit
Data Source
AI summary
A circuit board mounted with a capacitor includes an electrode to connect one terminal of a capacitor, a first inductor including a wiring pattern that extends from a first end connected with the electrode to a second end across a region mounted with the capacitor, and a second inductor including a wiring pattern that extends from the first end connected with the electrode to a second end across the region mounted with the capacitor from the opposite side from the first inductor. In a plan view, the wiring pattern of the first inductor and the wiring pattern of the second inductor intersect with each other, and an angle defined by the wiring pattern of the first inductor and the wiring pattern of the second inductor is an angle other than a right angle.