Power Converter Switching Frequency Tuning for Peak Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mass-produced power converters often have underrated designed efficiency due to unaccounted variations in components, leading to suboptimal performance.
Innovation Solution
A method that involves acquiring samples of electrical characteristics over a range of switching frequencies to estimate a corner value and set the switching frequency for peak efficiency, adjusting either output voltage or input current to minimize output resistance and maximize efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mass-produced power converters use fixed designed switching frequency, then manufacturing is simplified, but efficiency is underrated due to unaccounted component variations
Solution Approach 1:
The patent implements dynamic switching frequency adjustment by measuring the actual resonant frequency of the power stage components and adapting the switching frequency accordingly. This resolves the contradiction by moving from a fixed, manufacturer-set frequency to a dynamic, measurement-based frequency that accounts for component variations in mass-produced converters, thereby improving efficiency without complicating manufacturing
Solution Approach 2:
The patent changes the switching frequency parameter based on measured electrical characteristics (such as resonant frequency) of the power stage. By adjusting this critical parameter according to actual component values rather than design specifications, the system achieves optimal efficiency while maintaining simple mass production processes
2Loss of energy
If switching frequency is optimized for peak efficiency, then power loss is reduced, but additional measurement and control complexity is introduced
Solution Approach 1:
The system performs self-characterization by automatically measuring its own electrical characteristics (resonant frequency, impedance) and using this information to optimize its switching frequency. This self-service approach reduces power loss without requiring external measurement equipment or complex control systems, as the converter characterizes and optimizes itself
Solution Approach 2:
The patent implements feedback by measuring electrical characteristics of the power stage and using this feedback to adjust the switching frequency to the optimal value. This closed-loop approach reduces power loss while keeping the measurement and control system relatively simple, as it only requires basic electrical measurements rather than complex monitoring
Data Source
AI summary
Techniques for fine tuning efficiency of a power converter are provided. In an example, a method can include acquiring a plurality of samples of an electrical characteristic of the power converter over a range of switching frequencies of the power converter to provide a plurality of sample pairs, estimating a corner value of the electrical characteristic based on the plurality of samples pairs, estimating a corresponding frequency associated with the corner value of the electrical characteristic based on frequencies of the plurality of sample pairs, and setting a switching frequency of the power converter at the corresponding frequency.