Power Converter Capacitor Mounting for Vibration Resistance
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Solution Overview
Problem
Power conversion apparatuses with large-capacity capacitors face challenges in resisting vibration while maintaining sufficient space for components, as fixing frames for capacitors occupy space needed for switching elements, increasing the size of the cooler base.
Innovation Solution
The apparatus includes capacitor units, power converters, a base, coupling members, and fitting members, where coupling members are fixed to adjacent capacitor units and fitting members are attached to both sides of capacitor units and the base, allowing for vibration resistance without occupying additional space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixing frames are fixed to the cooler base to secure capacitor units against vibration, then vibration resistance is improved, but the space for accommodating switching elements is reduced, resulting in an increase in the size of the cooler base
Solution Approach 1:
The fixing structure is divided into two independent parts: fixing frames for capacitor units and the cooler base for switching elements. The capacitor units are fixed to the housing body rather than the cooler base, separating the fixing functions and allowing independent optimization of each component's space requirements.
Solution Approach 2:
The fixing function for capacitor units is extracted from the cooler base structure. Instead of integrating both fixing functions into the cooler base, the capacitor unit fixing is taken out and implemented through separate fixing frames mounted on the housing body, freeing up cooler base space for switching elements.
2Reliability
If capacitor units are disposed in the vicinity of switching elements to reduce inductance, then electrical performance is improved, but the space for accommodating both components is reduced
Solution Approach 1:
The spatial arrangement transitions from a two-dimensional layout on the cooler base to a three-dimensional configuration utilizing the housing body volume. Capacitor units are positioned in the vicinity of switching elements through vertical or lateral arrangement in the housing space, maintaining electrical performance while preserving cooler base area for switching element accommodation.
Data Source
AI summary
A power conversion apparatus includes a base having a main surface to which switching elements of each of power converters are fixed, capacitor units, coupling members fixed to some of the capacitor units adjacent to each other, and fitting members fixed to the respective capacitor units and fixed to the base. The capacitor units are disposed along the main surface of the base.