Noise reduction in a power converter

Details Noise reduction in a power converter Noise reduction in a power converter

2007-04-10

2007-04-10

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S2090SC, C315S244000, C315S276000

Reexamination Certificate

active

10504140

ABSTRACT:
A power converter includes a control device (28) for a switching power converter (10), a switching power converter and a method of controlling a switch in a power converter for reducing audible noise. The power converter includes the control device (28) and at least one switch (26) for regulating the power conversion. The control device (28) includes a timer (45) for monitoring a switching frequency of the switch (26) to indicate when the frequency has dropped to a certain level, and a gate driving circuit (32) connected to the timer and arranged to regulate the switching of the switch in dependence of the indication from the timer, so that the frequency rises above the certain level in order to reduce generation of audible noise.

REFERENCES:
patent: 5500575 (1996-03-01), Ionescu
patent: 6011361 (2000-01-01), Blankers
patent: 6204649 (2001-03-01), Roman
patent: 6211625 (2001-04-01), Nilssen
patent: 6212079 (2001-04-01), Balakrishnan et al.
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patent: 6525514 (2003-02-01), Balakrishnan et al.
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Kleuskens et al., 75W SMPS with TEA 1507 Quasi-Resonant Flyback controller, Philips Semiconductor Jun. 30, 2000.

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