Power Capacitor with Integrated Dielectric Interference Suppression
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Solution Overview
Problem
Existing power capacitors in pulse-controlled inverters for hybrid or electric vehicles require separate interference-suppression capacitors, which increase costs and space requirements, and impair capacitive effects due to inductive connecting lines.
Innovation Solution
Integration of dielectric material within the power capacitor to form planar capacitors directly between energizing units and the housing, eliminating the need for separate interference-suppression capacitors and reducing impedance for interference current discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If separate interference-suppression capacitors are integrated into the pulse-controlled inverter by connecting them between the battery terminal and housing ground, then electromagnetic interference is suppressed, but device complexity and installation space increase
Solution Approach 1:
The patent combines the power capacitor and interference-suppression capacitor into a single integrated component. The power capacitor includes both the main capacitor element and integrated interference-suppression capacitors (Y-capacitors) formed by dielectric layers between energizing units and the housing, eliminating the need for separate interference-suppression capacitors and their connecting lines.
Solution Approach 2:
The power capacitor housing serves multiple functions: it contains the main capacitor elements, provides structural support, acts as an electrical connection to housing ground, and forms integrated interference-suppression capacitors with the dielectric layers between energizing units and housing walls.
2Object-affected harmful factors
If separate interference-suppression capacitors are connected via connecting lines, then electromagnetic interference is suppressed, but impedance increases due to inductive connecting lines
Solution Approach 1:
The patent removes the inductive connecting lines from the interference-suppression capacitor configuration. Instead of connecting separate Y-capacitors to the housing ground through wires, the interferenc-suppression capacitors are formed directly between the energizing units and the housing wall, eliminating the inductive impedance of connecting lines.
Solution Approach 2:
The housing wall acts as an intermediary that provides both mechanical support and electrical connection to housing ground. The dielectric layers between energizing units and the housing wall create capacitance without requiring separate connecting lines, as the housing wall itself serves as the reference potential.
3Object-affected harmful factors
If separate interference-suppression capacitors are used, then electromagnetic interference is suppressed, but costs increase
Solution Approach 1:
The patent merges the power capacitor and interference-suppression capacitor into a single manufactured component. The same housing, energizing units, and dielectric materials serve both the main power storage function and the interference suppression function, eliminating the need to manufacture and assemble separate interference-suppression capacitors.
Solution Approach 2:
The housing and dielectric materials perform dual functions: providing mechanical containment and structural support while simultaneously creating interference-suppression capacitors. This multi-functionality reduces the total component count and manufacturing complexity.
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 reduces costs and space requirements while enhancing interference suppression by allowing interference currents to discharge with lower impedance and improving capacitive effects through the use of high-frequency dielectric materials.
Implementation Method 1
a layer made of a dielectric material other than air being situated between the first subregion of the first energizing unit and the housing wall of the electronics unit
Implementation Method 2
a layer made of a dielectric material other than air being situated between the first subregion of the first energizing unit and the housing wall of the electronics unit
Data Source
AI summary
A power capacitor, in particular a DC link capacitor, having a capacitor housing which has a first housing wall, in particular made of metal, which is galvanically connectable to a housing of an electronics unit, in particular a power electronics unit, and planar energizing units for energizing the power capacitor. A first subregion of a first energizing unit extends in an inner space of the housing adjacent to and at a distance from the first housing wall or from a different housing wall of the capacitor housing that is conductively connected to the first housing wall. A layer made of a dielectric material other than air is situated between the first subregion of the first energizing unit and this housing wall.