Power Switching Component With Local Magnetic Filtering
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Solution Overview
Problem
Existing power electronic switches generate thermal losses and common-mode disturbances due to stray capacitances, which are difficult to manage with current filtering solutions, especially with the increasing switching speeds of modern electronic switches, leading to bulkiness, weight, and cost issues.
Innovation Solution
A magnetic core is placed around each elementary component to filter displacement currents through stray capacitances, using ferromagnetic materials with high relative magnetic permeability, and is designed to avoid the path of the conduction current, allowing independent core characteristics and placement for optimal filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic core is placed around each elementary component to filter displacement currents, then filtering efficiency is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent divides the filtering function into separate magnetic cores for each elementary component (transistor, diode) rather than using a single common filter. Each magnetic core is independently positioned around its respective component's stray capacitance, enabling targeted filtering and simplifying the overall system design while maintaining high filtering efficiency.
Solution Approach 2:
The patent applies filtering locally at each elementary component's location rather than globally. Each magnetic core is specifically positioned around the stray capacitance of its associated component, providing localized filtering that addresses common-mode disturbances at their source with optimized effectiveness for each component's specific electrical characteristics.
2Reliability
If magnetic cores are used to filter common-mode disturbances, then filtering performance is improved, but weight and volume increase
Solution Approach 1:
By segmenting the filtering function into multiple small magnetic cores distributed around individual components, the patent reduces the total volume and weight compared to a single large common-mode filter. Each small core only needs to handle the stray capacitance of its associated component, significantly reducing the required magnetic material for each unit.
Solution Approach 2:
The patent introduces magnetic cores as intermediary elements positioned between the elementary components and the common electrical ground. These cores act as local mediators that filter displacement currents through stray capacitances before they propagate, reducing the need for larger downstream filtering components and thereby reducing overall system weight.
3Reliability
If magnetic cores surround elementary components, then displacement current filtering is improved, but conduction current path may be affected
Solution Approach 1:
The patent extracts the conduction current path from the magnetic core's influence by routing it through the central void of each magnetic core. This separation ensures that the useful conduction current does not form turns around the magnetic core material, preventing unwanted magnetic induction and interference with the conduction current while allowing the magnetic core to effectively filter displacement currents through the surrounding stray capacitances.
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 approach effectively reduces common-mode disturbances and thermal losses by minimizing magnetic core size and weight while maintaining high filtering efficiency, even at high switching frequencies.
Implementation Method 1
a magnetic core produced in a ferromagnetic material, the magnetic core surrounding the elementary component concerned without surrounding others of the elementary components and being disposed in the component in such a way that a displacement current between the surrounded elementary component and the baseplate induces a magnetic induction in the magnetic core
Implementation Method 2
using ferromagnetic materials with high relative magnetic permeability
Implementation Method 3
a baseplate onto which the substrate is fixed, the baseplate being configured to discharge heat emitted in the switchings of the switching component
Data Source
AI summary
A switching component configured to switch an electrical signal, the switching component includes a substrate bearing several elementary components each ensuring the switching of the electrical signal, a baseplate onto which the substrate is fixed, the baseplate being configured to discharge heat emitted in the switchings of the switching component, two electrical conductors each connected to one of the elementary components and respectively ensuring the input and the output of the elementary component concerned for the signal (IC) to be switched, a magnetic core produced in a ferromagnetic material, the magnetic core surrounding the elementary component concerned without surrounding others of the elementary components and being disposed in the component in such a way that a displacement current between the surrounded elementary component and the baseplate induces a magnetic induction in the magnetic core, and in such a way that the path followed by a conduction current of the electrical signal switched by the component does not form a turn around the magnetic core.