Method and apparatus for reducing audio noise in a switching...

Details Method and apparatus for reducing audio noise in a switching... Method and apparatus for reducing audio noise in a switching...

2007-05-01

2007-05-01

Patel, Rajnikant B. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S283000, C363S131000

Reexamination Certificate

active

11404688

ABSTRACT:
A switching regulator utilizing on/off control that reduces audio noise at light loads by adjusting the current limit of the switching regulator. In one embodiment, a switching regulator includes a state machine that adjusts the current limit of the switching regulator based on a pattern of feedback signal values from the output of the power supply for a preceding N cycles of the drive signal. The state machine adjusts the current limit lower at light loads such that cycles are not skipped to reduce the operating frequency of the switching regulator into the audio frequency range until the flux density through the transformer is sufficiently low to reduce the generation of audio noise.

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Power Integrations, Inc. “TinySwitch Family,” TNY253-254-255, product information, pp. 1-16, (Feb. 1999).

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