DC-DC Converter PWM Frequency Control for Audible Noise Reduction
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Solution Overview
Problem
Conventional DC-DC converters experience a decrease in operating frequency of their PWM signals when load variations occur, leading to noise interference as the frequency falls within the human-hearable range, compromising the utilization quality of electronic devices.
Innovation Solution
A DC-DC converter with an adjustment circuit and control circuit that detects the frequency of the PWM signal and reduces its pulse width when it falls below a predetermined frequency, ensuring the operating frequency remains above the human-hearable range without affecting voltage conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the COT regulator reduces the operating frequency of the PWM signal to improve voltage conversion efficiency, then energy loss decreases, but noise interference increases as the frequency falls into the human-hearable range
Solution Approach 1:
The patent changes the pulse width parameter of the PWM signal while maintaining the operating frequency above the human-hearable range. By adjusting the pulse width rather than the frequency, the system achieves improved voltage conversion efficiency without generating audible noise interference.
2Loss of energy
If the COT regulator increases the pulse width of the PWM signal to improve voltage conversion efficiency, then energy loss decreases, but the operating frequency falls below the human-hearable range causing noise interference
Solution Approach 1:
The patent adjusts the pulse width parameter within acceptable ranges to optimize voltage conversion efficiency while maintaining the operating frequency above the human-hearable range. This parameter optimization allows the system to achieve high efficiency without sacrificing frequency performance.
Data Source
AI summary
A DC-DC converter is provided. When a load of the DC-DC converter is too light, the DC-DC converter can raise a frequency of its PWM signal, and reduce a pulse width of the PWM signal, so as to avoid the frequency of the PWM signal falling into a frequency range that can heard by human's ear and maintain high conversion efficiency of the DC-DC converter.