US 11,736,004 B2
Method and apparatus for reducing EMI for a frequency-modulated DC-DC converter
Chuipong Liu, Hong Kong (CN); and Hungpiu Poon, Hong Kong (CN)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on May 28, 2021, as Appl. No. 17/333,182.
Claims priority of application No. 202010487150.5 (CN), filed on Jun. 1, 2020.
Prior Publication US 2021/0376716 A1, Dec. 2, 2021
Int. Cl. H02M 1/44 (2007.01); H02M 3/155 (2006.01); H02M 7/217 (2006.01); H02M 1/00 (2006.01)
CPC H02M 1/44 (2013.01) [H02M 1/007 (2021.05); H02M 1/0025 (2021.05); H02M 3/155 (2013.01); H02M 7/217 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for reducing electromagnetic interference (EMI) for a frequency-modulated DC-DC converter, the method comprising:
pre-regulating an input voltage of the frequency-modulated DC-DC converter, so that the frequency-modulated DC-DC converter changes an operating frequency of the frequency-modulated DC-DC converter to stabilize an output voltage of the frequency-modulated DC-DC converter, so as to achieve a desired frequency extension; wherein
a spread spectrum range of the operating frequency of the frequency-modulated DC-DC converter is larger than a bandwidth of a bandpass filter of an EMI measurement apparatus.