Dynamic Frequency Subrange Assignment for Switching Device EMI Reduction
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Solution Overview
Problem
Systems with multiple electrical or electronic switching devices experience peak electromagnetic interference due to uncoordinated switching frequencies, leading to emissions concentration and potential degradation of other electronic devices' efficiency, exceeding EMC regulations.
Innovation Solution
A method involving a controller with a microprocessor and memory to dynamically determine subranges of frequencies for each switching device, using a timer to spread peak frequencies within these subranges, thereby reducing peak electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple switching devices operate independently without coordination, then each device can function autonomously, but peak electromagnetic interference increases due to uncoordinated switching frequencies
Solution Approach 1:
The patent implements dynamic frequency assignment where each switching device is assigned a frequency subrange that changes over time based on system conditions. The controller dynamically adjusts the switching frequencies of individual devices within their assigned subranges to distribute peak emissions across a broader frequency spectrum, thereby reducing peak EMI while maintaining autonomous operation of each device
Solution Approach 2:
The patent divides the overall frequency spectrum into multiple subranges, with each switching device assigned to a specific subrange. This segmentation prevents devices from operating at identical frequencies and distributes electromagnetic emissions across different frequency bands, reducing peak interference while allowing each device to operate independently within its designated range
2Stability of the object's composition
If switching devices use fixed switching frequencies, then device operation is simple and stable, but electromagnetic emissions concentrate at specific frequencies causing peak EMI
Solution Approach 1:
The patent transitions from fixed frequency operation to dynamic frequency modulation within assigned subranges. Each switching device modulates its switching frequency dynamically within its designated subrange, spreading peak emissions over time and frequency while maintaining stable operation. This dynamic approach prevents concentrated emissions at single frequencies while preserving operational stability
Solution Approach 2:
The patent changes the frequency parameter of switching devices from fixed values to dynamically varying values within assigned subranges. By continuously adjusting the switching frequency parameter within the designated subrange, the system spreads electromagnetic emissions across a broader frequency spectrum, eliminating concentration at specific frequencies while maintaining stable device operation
3Object-affected harmful factors
If switching frequencies are coordinated to reduce peak EMI, then electromagnetic compatibility improves, but system complexity increases due to need for coordination
Solution Approach 1:
The patent segments the frequency spectrum into distinct subranges assigned to different switching devices, eliminating the need for complex real-time coordination. Each device operates independently within its assigned subrange, simplifying the system architecture while achieving EMI reduction through frequency distribution. The controller assigns subranges but devices autonomously operate within them
Solution Approach 2:
The patent enables each switching device to autonomously select and adjust its operating frequency within its assigned subrange without requiring continuous coordination with other devices. This self-service approach allows devices to independently spread their emissions while the system as a whole achieves reduced peak EMI, significantly reducing system complexity compared to centralized coordination
Data Source
AI summary
The system and method for dynamically reducing the peak electromagnetic interference produced by a group of electrical or electronic switching devices connected to a common communications bus. The system and method includes a fixed range of frequencies that includes frequencies emitted by the group of switching devices during normal operation and subranges of frequencies within the fixed range of frequencies, each subrange of frequencies being associated with a unique bus address of one switching device in the group of switching devices. Each subrange of frequencies being determined by the unique bus address of its associated switching device and characteristic weights dynamically determined and/or assigned to its associated switching device and/or load by a microprocessor implemented algorithm.