| 摘要 |
A method for reducing audible monotonic noise in a power conversion system (10) using one or more controllable converters (20, 120, 26, and 136) includes generating a set of pulse width modulated (PWM) signals so that each converter has a different average switching frequency, and randomly varying successive cycle time intervals of the generated signals so that a respective instantaneous frequency shift relative to the respective average switching frequency of the converters is achieved over each of the time intervals.
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