Boost Converter Current Control for Audible Inductor Noise
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-power power converters generate drastically changing dynamic currents that cause significant fluctuations in inductor currents within the auditory frequency range, leading to noise issues during boost conversion, which negatively impact user experience.
Innovation Solution
A power converter system comprising a rectifier, a boost circuit with a boost inductor, a current sensor, and a processor that senses inductor current values and adjusts operation modes based on reference values calculated from input impedance and output voltage to control the inductor current fluctuations, thereby suppressing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power converter performs boost conversion on AC power, then the output power is increased, but the inductor current fluctuates drastically generating noise
Solution Approach 1:
The patent applies dynamics by switching between different operation modes (first operation mode and second operation mode) based on real-time current conditions. The processor dynamically adjusts the control strategy for the boost circuit depending on whether the current sensor value exceeds the reference value, allowing the system to adaptively suppress noise during high-current operations while maintaining normal boost conversion functionality.
Solution Approach 2:
The patent implements feedback by continuously monitoring the current sensor value and comparing it against a reference value generated by the processor. When the sensed current exceeds the reference threshold, the system triggers a mode switch to adjust the boost circuit operation, creating a closed-loop control mechanism that suppresses inductor current fluctuations and associated noise while maintaining power conversion efficiency.
2Productivity
If the inductor current is allowed to fluctuate freely, then the boost conversion efficiency is maintained, but noise is generated within the auditory frequency range
Solution Approach 1:
The system dynamically switches between operation modes based on real-time current conditions. During high-current scenarios where noise would normally occur, the processor activates the first operation mode with adjusted control parameters that suppress inductor current fluctuations. During normal operation, the system maintains standard boost conversion for optimal efficiency, thus achieving both noise suppression and productivity maintenance.
Solution Approach 2:
The patent changes operational parameters by switching between different operation modes with distinct control strategies. The processor generates dynamic reference values and adjusts control parameters for the boost circuit based on the sensed current relative to the reference value, modifying electrical parameters adaptively to suppress noise during peak conditions while maintaining efficiency during normal operation.
Data Source
AI summary
A power converter and an operation method of the power converter are provided. The power converter includes a rectifier, a boost circuit, a current sensor, and a processor. The rectifier rectifies an AC power to generate a rectified power. The boost circuit includes a boost inductor. The boost circuit boosts the rectified power to generate an output power. The current sensor senses an inductor current value at the boost inductor to generate a sensed value corresponding to the inductor current value. The processor generates a first reference value according to an output voltage value of the output power, an input impedance value, and a first value. When the sensed value is greater than the first reference value, the processor enters a first operation mode to cause the sensed value to be not less than the first reference value.