Composite Capacitor Layout for High-Voltage Noise Suppression
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Solution Overview
Problem
Conventional composite capacitors struggle to effectively suppress high-frequency noise and withstand higher voltages due to limitations in capacitance and voltage withstand capability, especially with metallized film and ceramic capacitors, which are inadequate for modern inverter switching speeds.
Innovation Solution
A composite capacitor design comprising a main capacitor with wound or laminated metallized film elements and a parallel plate sub-capacitor with a sheet dielectric, where the sub-capacitor is connected in parallel to the main capacitor, allowing for higher voltage withstand and effective high-frequency noise suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metallized film capacitor is used for noise suppression, then the capacitor can withstand higher voltages, but the capacitance becomes too large to effectively suppress high-frequency noise
Solution Approach 1:
The invention divides the capacitor system into two separate components: a main capacitor for voltage withstand and a sub-capacitor for noise suppression. This segmentation allows each component to be optimized for its specific function without compromise.
Solution Approach 2:
The invention applies different dielectric materials to different parts of the system: a metallized film dielectric for the main capacitor (voltage withstand) and a ceramic dielectric for the sub-capacitor (noise suppression). Each part has locally optimized properties for its specific function.
2Quantity of substance
If a ceramic capacitor is used for noise suppression, then the capacitance is small enough for high-frequency noise, but the voltage withstand capability becomes insufficient
Solution Approach 1:
The invention divides the capacitor system into two separate components: a main capacitor for voltage withstand and a sub-capacitor for noise suppression. This segmentation allows each component to be optimized for its specific function without compromise.
Solution Approach 2:
The invention applies different dielectric materials to different parts of the system: a metallized film dielectric for the main capacitor (voltage withstand) and a ceramic dielectric for the sub-capacitor (noise suppression). Each part has locally optimized properties for its specific function.
3Measurement precision
If the switching elements operate faster, then the inverter control precision is improved, but the high-frequency noise intensity increases
Solution Approach 1:
The invention introduces a sub-capacitor as an intermediary element between the switching elements and the main capacitor. This sub-capacitor acts as a local energy reservoir that absorbs high-frequency noise generated by fast switching, preventing it from propagating through the main capacitor and affecting control precision.
Solution Approach 2:
The invention divides the capacitor system into two separate components: a main capacitor for voltage withstand and a sub-capacitor for noise suppression. This segmentation allows each component to be optimized for its specific function without compromise.
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 design achieves efficient high-frequency noise reduction and higher voltage withstand capability, optimizing capacitance for modern inverter switching speeds while minimizing space and cost.
Implementation Method 1
a sheet dielectric held between the first electrode plate body and the second electrode plate body
Implementation Method 2
a capacitor element formed of a wound or laminated metallized film made up of a dielectric film and electrodes deposited on the dielectric film
Data Source
AI summary
To provide a composite capacitor that withstands higher voltages and handles the high-frequency operations of switching elements. In a main capacitor 10 formed of a metallized film, first and second plate conductor terminals 12c, 13c as cathode and anode are continuously connected to first and second plate conductor bodies 12a, 13a. In a parallel plate sub-capacitor 20, a sheet dielectric 21 is inserted into a gap between opposed first and second electrode plate bodies 22a, 23a. First and second electrode plate terminals 22c, 23c are continuously connected to the first and second electrode plate bodies 22a, 23a. The main capacitor 10 and the sub-capacitor 20 are disposed in close proximity to each other. The first and second plate conductor terminals 12c, 13c and the first and second electrode plate terminals 22c, 23c can be connected to each other by the terminals of the same polarity.