Output-Coupled Choke Module for High-Frequency Noise Damping
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Solution Overview
Problem
Existing choke modules with integrated capacitors suffer from resonance effects that reduce noise attenuation in high frequency ranges, particularly between 10 MHz to 1000 MHz, due to parasitic capacitance, which is exacerbated by the number of winding turns.
Innovation Solution
A choke module design where the integrated capacitor is connected only to the output terminal, allowing signals to flow through the choke before reaching the capacitor, utilizing the choke's impedance to damp noise and shift resonance effects to a lower frequency range, thereby improving high-frequency noise attenuation without additional discrete elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of winding turns in the choke is increased to improve noise attenuation in low frequency ranges, then noise attenuation characteristics are improved, but parasitic capacitance effects increase which diminish noise attenuation in high frequency ranges
Solution Approach 1:
The harmful parasitic capacitance effects are extracted and addressed by introducing a dedicated damping capacitor connected only to the output terminal. This separate component specifically targets and compensates for the parasitic capacitance without requiring changes to the original winding structure, thereby resolving the high-frequency attenuation problem while preserving the low-frequency performance achieved through multiple turns.
Solution Approach 2:
The damping capacitor changes the electrical parameters of the circuit by introducing a specific capacitance value that resonates with the parasitic capacitance at the problematic high-frequency range. This parameter adjustment creates a damping effect that counteracts the parasitic capacitance, improving noise attenuation in the 10 MHz to 1000 MHz range without affecting the low-frequency attenuation provided by the winding turns.
2Reliability
If additional discrete elements are added to improve noise attenuation, then noise filtering performance is improved, but device complexity and space requirements increase
Solution Approach 1:
The damping capacitor is integrated into the existing printed circuit board structure rather than being implemented as a separate discrete component. This merging approach combines the damping function with the existing PCB layout, eliminating the need for additional discrete elements and reducing device complexity while maintaining improved noise filtering performance across the frequency spectrum.
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 design effectively reduces resonance effects and enhances noise attenuation in the high frequency range, requiring minimal additional components and space, while maintaining effective noise damping across the frequency spectrum.
Implementation Method 1
The choke comprises a magnetic core and at least one winding... The material of the wires, the core and the number of winding turns define electrical parameters like inductance
Implementation Method 2
The support comprises at least one integrated capacitor... These parasitic capacitance effects increase proportionally with the number of turns in the windings
Data Source
AI summary
In an embodiment a choke module includes a choke with a magnetic core and at least one winding, a support including at least one integrated capacitor, and an input terminal and an output terminal, wherein the choke is located on the support, and wherein each capacitor integrated in the support is connected to the choke only by being connected to the output terminal.