Switching controller capable of reducing acoustic noise for...

Details Switching controller capable of reducing acoustic noise for... Switching controller capable of reducing acoustic noise for...

2011-07-19

2011-07-19

Laxton, Gary L (Department: 2838)

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

C363S021130, C363S021180

Reexamination Certificate

active

07983061

ABSTRACT:
The present invention provides a switching controller capable of reducing acoustic noise of a transformer for a power converter. The switching controller includes a switching circuit, a comparison circuit, an activation circuit, and an acoustic-noise eliminating circuit. The acoustic-noise eliminating circuit comprises a first-check circuit, a second-check circuit, a pulse-shrinking circuit, and a limit circuit. The first-check circuit receives a switching-current signal which is correlated to a switching current of the power converter and a PWM signal to generate a trigger signal. The second-check circuit receives the trigger signal to generate a control signal. When the frequency of the trigger signal falls into audio band, the control signal will be enabled to limit the switching current. Therefore, the acoustic noise of the transformer can be eliminated.

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patent: 7701735 (2010-04-01), Park et al.
patent: 7733673 (2010-06-01), Balakrishnan et al.

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