Power Converter Output Capacitor Layout for Low-Inductance Filtering
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Solution Overview
Problem
Conventional power conversion devices are large in size due to the inclusion of a smoothing circuit unit and a filter circuit unit, which increases their overall dimensions.
Innovation Solution
A power conversion device comprising a power conversion circuit with a smoothing circuit including two types of capacitors, a positive-side conductor with a bent structure, and a negative-side conductor, where the capacitors are mounted on a substrate with specific connections and arrangements to minimize parasitic inductance and eliminate the need for an output filter unit, utilizing smaller capacitors for high-frequency noise suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a smoothing circuit unit and a filter circuit unit are included in the power conversion device, then the ripples and switching noise can be suppressed, but the device becomes large in size
Solution Approach 1:
The patent combines the smoothing circuit unit and filter circuit unit into a single integrated structure where output capacitors serve dual purposes. The smoothing capacitors are directly mounted on the substrate connecting part, eliminating the need for separate filter components. This merging approach maintains effective ripple and noise suppression while reducing overall device size.
Solution Approach 2:
The output capacitors perform multiple functions simultaneously: they act as smoothing capacitors for ripple reduction and as filter elements for switching noise suppression. The substrate connecting part serves both as a mounting platform and as a low-inductance connection structure. This multi-functionality eliminates the need for dedicated filter components, achieving both noise suppression and compact size.
2Object-affected harmful factors
If conventional filter components are used, then high-frequency noise suppression is achieved, but additional components increase device complexity
Solution Approach 1:
The patent extracts the filtering function from separate filter components and integrates it directly into the output capacitor structure. By mounting capacitors directly on the substrate connecting part and utilizing the low-inductance connection, the filtering action is embedded within the existing capacitor architecture rather than requiring additional discrete filter elements.
Solution Approach 2:
The output capacitors and substrate connecting part work together as a self-sufficient noise suppression system. The low-inductance connection structure inherently provides high-frequency filtering without requiring external filter components. The system uses its own structural features (capacitor mounting arrangement and conductor design) to achieve noise suppression, eliminating the need for separate filtering mechanisms.
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 device achieves downsizing and cost reduction by improving high-frequency filter performance and reducing parasitic inductance, allowing for compact design without additional components.
Implementation Method 1
a plurality of output capacitors, a positive-side conductor (170) having at least one bent structure, and a negative-side conductor (70)
Implementation Method 2
improving high-frequency filter performance and reducing parasitic inductance
Data Source
AI summary
A power conversion device includes a power conversion circuit, a smoothing circuit including output capacitors, a positive-side conductor having a bent structure, and a negative-side conductor, a positive-side output terminal, a negative-side output terminal, and a substrate having first and second substrate connecting parts. The output capacitors are mounted on the substrate, an end of each of the output capacitors is connected to the positive-side conductor at a first substrate connecting part and the other end of it is connected to the negative-side conductor at a second substrate connecting part. The output capacitors include first and second capacitors, the shortest distance between the first and second substrate connecting parts is shorter than an inter-terminal length of the first capacitor and longer than that of the second capacitor, and the second capacitor is mounted between the first and second substrate connecting parts.