Power Converter Housing Structure for High-Frequency Noise Suppression
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Solution Overview
Problem
Existing power conversion devices struggle to effectively suppress noise propagation, especially at high frequencies, due to the limitations of capacitors used for noise suppression, which are influenced by equivalent series inductance, resistance, and wiring impedance.
Innovation Solution
The implementation of a pseudo capacitor structure within the power conversion device, formed by a metal housing extension portion and an insulator, eliminates the need for traditional capacitors, reducing noise propagation without equivalent series inductance and resistance, and enhances noise suppression across high frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional capacitors are used for noise suppression, then noise propagation can be suppressed at low frequencies, but noise propagation at high frequencies cannot be effectively suppressed due to equivalent series inductance, resistance, and wiring impedance
Solution Approach 1:
The patent extracts the noise suppression function from traditional capacitors and implements it through a pseudo capacitor structure formed by the housing extension portion and insulator. This eliminates the equivalent series inductance and resistance that limit traditional capacitors at high frequencies, thereby resolving the contradiction between low-frequency noise suppression and high-frequency noise suppression effectiveness.
Solution Approach 2:
The patent introduces an insulator as an intermediary element between the housing extension portion and the external connection terminal. This insulator forms a pseudo capacitor that mediates the noise suppression function, allowing effective noise suppression across both low and high frequency ranges without the limitations of traditional capacitor components.
2Object-affected harmful factors
If traditional capacitors and additional noise suppression components are used, then noise propagation can be suppressed, but the device complexity and component count increase
Solution Approach 1:
The patent merges the noise suppression function with the existing housing structure by forming a pseudo capacitor using the housing extension portion and insulator. This integration eliminates the need for separate traditional capacitors and additional noise suppression components, thereby reducing device complexity and component count while maintaining effective noise suppression across wide frequency ranges.
Solution Approach 2:
The housing extension portion serves multiple functions: it provides structural support as part of the housing, creates the pseudo capacitor for noise suppression, and forms the first ground. This multi-functionality reduces the need for additional components and simplifies the overall device structure while achieving effective noise suppression.
3Ease of manufacture
If the metal housing is directly connected to the external connection terminal, then electrical connection is simplified, but noise propagation occurs due to lack of insulation
Solution Approach 1:
The patent introduces an insulator as an intermediary element between the housing extension portion and the external connection terminal. This insulator blocks noise propagation while the housing extension portion maintains the electrical connection function as the first ground, thereby resolving the contradiction between connection simplicity and noise suppression.
Solution Approach 2:
The insulator is selectively placed only at the critical interface between the housing extension portion and the external connection terminal where noise propagation occurs. This localized insulation approach maintains electrical connection simplicity in other areas while effectively suppressing noise at the specific location where it is needed.
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 solution effectively reduces noise propagation across a wide frequency range, including high frequencies, without the need for additional components, thereby improving noise suppression efficiency.
Implementation Method 1
an insulator having at least a part disposed between the metal housing and the external connection terminal, and insulating the metal housing and the external connection terminal from one another
Implementation Method 2
implementation of a pseudo capacitor structure within the power conversion device, formed by a metal housing extension portion and an insulator, eliminates the need for traditional capacitors, reducing noise propagation without equivalent series inductance and resistance
Data Source
AI summary
A power conversion device, as an electronic device, includes a circuit substrate, a metal housing, an external connection terminal, and an insulator. The external connection terminal projects from the interior to the exterior of the metal housing, and is used to connect an output terminal of the circuit substrate to the exterior. A part of the insulator is disposed between the metal housing and the external connection terminal, and insulates the metal housing and the external connection terminal from one another. A housing extension portion is formed in the metal housing, extending from a body portion of the metal housing, in the inward direction with respect to the metal housing, in a condition facing the external connection terminal. A part of the insulator is disposed between the external connection terminal and the housing extension portion.