Parallel Power Supply Frequency Staggering for EMI Reduction
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Solution Overview
Problem
Existing power supply systems face challenges in reducing system-level noise accumulation and electromagnetic interference due to multiple power supplies operating at the same frequency, leading to inefficiencies and decreased power density.
Innovation Solution
The power supply system includes a control module that coordinates multiple power supplies to operate at inconsistent frequencies and adjusts power allocation between critical and non-critical loads, using a system controller to stagger operating frequencies and optimize efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple power supplies operate at the same frequency, then power conversion efficiency is maintained, but electromagnetic interference and noise accumulation increase
Solution Approach 1:
The patent changes the operating frequency parameter of multiple power supplies from being identical to being staggered/different. The system controller adjusts the switching frequencies of individual power supplies within their operating ranges, creating frequency differentiation that reduces electromagnetic interference while maintaining overall power conversion efficiency.
2Device complexity
If multiple power supplies operate at the same frequency, then system complexity is reduced, but noise accumulation increases
Solution Approach 1:
The system controller implements feedback control by monitoring the operating status of multiple power supplies and dynamically adjusting their switching frequencies. This feedback mechanism ensures that frequency staggering is maintained without requiring complex manual configuration, thereby reducing noise accumulation while keeping system complexity manageable through automated control.
3Object-generated harmful factors
If power supplies operate at inconsistent frequencies, then electromagnetic interference is reduced, but control complexity increases
Solution Approach 1:
The patent merges the control functions of multiple power supplies into a single system controller that coordinates frequency adjustment across all units. This centralized control approach simplifies the overall control architecture compared to having independent control circuits in each power supply, while still achieving frequency differentiation to reduce electromagnetic interference.
Data Source
AI summary
A power supply equipment supplies power to a critical load and a non-critical load. The power supply equipment includes a plurality of power supplies coupled in parallel and a system controller. The system controller is coupled to the power supplies, and communicates with the power supplies to set a specific sequence. The system controller notifies the power supplies to adjust operating frequencies to be inconsistent according to the specific sequence.