US 12,407,259 B2
Method and apparatus for suppressing audible buzz from high-efficiency switching-mode power supply
Shengyuan Li, Irvine, CA (US); Jianlong Chen, Irvine, CA (US); and Xicheng Jiang, Irvine, CA (US)
Assigned to Avago Technologies International Sales Pte. Limited, Singapore (SG)
Filed by Avago Technologies International Sales Pte. Limited, Singapore (SG)
Filed on Mar. 3, 2023, as Appl. No. 18/117,344.
Prior Publication US 2024/0297584 A1, Sep. 5, 2024
Int. Cl. H02M 3/158 (2006.01); H02M 1/00 (2006.01); H02M 1/14 (2006.01)
CPC H02M 3/1582 (2013.01) [H02M 1/0045 (2021.05); H02M 1/143 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A circuit, comprising:
a boost circuit;
a first circuit coupled to the boost circuit and comprising a digital-to-analog converter (DAC); and
a second circuit coupled to the boost circuit, wherein:
the boost circuit, the first circuit, and the second circuit form an open loop,
the first circuit and the second circuit are configured to maintain a switching frequency of the boost circuit above a threshold frequency, and
the first circuit is configured to:
receive a first current and a second current, and
subtract the second current from the first current to provide a third current to the DAC.