Arrangement for actively suppressing interference signals
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Solution Overview
Problem
Existing solutions for suppressing electromagnetic interference (EMI) in high-voltage inverters, such as those in refrigerant compressors, require significant installation space and are costly due to the use of passive EMC filters, and active EMC filters face challenges with power losses and heat dissipation.
Innovation Solution
An active EMC filter arrangement is implemented with a separate, smaller circuit board for the filter components housed within a refrigerant compressor, utilizing a recess for compact installation and effective heat dissipation through thermal conductivity with the compressor's housing, and an electrically conductive coating on the main circuit board for shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive EMC filters are used to suppress electromagnetic interference, then filtering effectiveness is improved, but installation space requirement increases and production cost increases
Solution Approach 1:
The patent changes the fundamental parameter of the EMC filter from passive to active, enabling the filter to dynamically adjust its characteristics and achieve effective interference suppression with significantly reduced component size and installation space requirements
Solution Approach 2:
The patent replaces the traditional passive mechanical filter structure with an active electronic filter system that uses control circuits and power electronics to achieve filtering, thereby reducing the physical space needed for filter components
2Reliability
If passive EMC filters are used to suppress electromagnetic interference, then filtering effectiveness is improved, but production cost increases
Solution Approach 1:
The patent transitions from passive to active filter technology, changing the operational parameters and enabling more efficient filtering with reduced material costs and simplified manufacturing processes
Solution Approach 2:
The patent extracts and eliminates the need for large, expensive passive filter components by implementing an active filter solution that achieves the same filtering effectiveness with smaller, more cost-effective elements
3Area of stationary object
If active EMC filter is used to suppress interference signals, then installation space is reduced, but power loss increases and heat dissipation becomes problematic
Solution Approach 1:
The patent introduces a heat sink as an intermediary thermal management component that efficiently dissipates the heat generated by the active EMC filter, enabling the compact filter design to operate reliably without excessive power loss
Solution Approach 2:
The patent implements feedback control in the active EMC filter to optimize its operation, reducing unnecessary power consumption and improving overall efficiency while maintaining effective interference suppression
4Area of stationary object
If active EMC filter is used to suppress interference signals, then installation space is reduced, but heat dissipation becomes problematic
Solution Approach 1:
The patent introduces a heat sink as an intermediary thermal management component that efficiently dissipates the heat generated by the active EMC filter, enabling the compact filter design to operate reliably without excessive power loss
Solution Approach 2:
The patent integrates multiple functions into the active EMC filter design, including thermal management through integrated heat dissipation structures, allowing the compact filter to handle both filtering and thermal regulation in a single integrated unit
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 configuration reduces installation space, lowers production costs, enhances filtering effectiveness, and improves power density by efficiently dissipating heat, thereby achieving reliable and secure EMI suppression with reduced interference emission.
Implementation Method 1
utilizing a recess for compact installation and effective heat dissipation through thermal conductivity with the compressor's housing
Implementation Method 2
an electrically conductive coating on the main circuit board for shielding
Implementation Method 3
onto the interference signal is superimposed a countersignal with its phase position rotated or shifted by 180°
Data Source
AI summary
The invention, which relates to an arrangement (1) for the active suppression of interference signals, addresses the problem of specifying an arrangement (1) for the active suppression of interference signals, with which the reliable and secure compensation of the EMC interferences is achieved, which has a lower installation space requirement, generates less interference emission and is cost-effective of production. This problem is resolved thereby that beneath the main circuit board (12) disposed on the surface of the housing (10) a recess (14) is disposed and that in this recess (14) a circuit board (15) for the active EMC filter (4) is emplaced.