Method and apparatus for reducing monotonic audible noise in a p

Details Method and apparatus for reducing monotonic audible noise in a p Method and apparatus for reducing monotonic audible noise in a p

1999-02-03

2000-03-28

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 26, 318375, H02M 112, H02M 3335, H02P 312

Patent

active

060439963

ABSTRACT:
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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Muhammad H. Rashid, Chapter 10 titled Pulse-width-modulated Inverters, "Power Electronics, Circuits, Devices and Applications" 2nd ed., 1993.

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