EMI reduction of switching power supply by frequency jitter

Author

Cai, Li ; Yang, Zhihui ; Chen, Wei

Author_Institution

Delta Power Electron. Center, Shanghai, China

Volume

4

fYear

2005

fDate

2-6 Oct. 2005

Firstpage

2790

Abstract

Frequency jitter is a technique to lower the EMI noise by spreading the noise energy around the main switching frequency. The RBW of IF filter in EMI receiver has great effects on the performance of frequency jitter. In this paper, a model and MathCAD calculation algorithm of IF filter and AV detector are build to exactly predict the peak amplitude reduction of switching power supply using frequency jitter. Based on frequency modulation theory and the EMI receiver model, the critical parameters of frequency jitter are selected optimally. A 65 W flyback converter with UC3842 has been built as a prototype, and the test results are given.

Keywords

electromagnetic interference; filters; interference suppression; jitter; mathematics computing; power engineering computing; switching convertors; 65 W; AV detector; EMI noise; EMI receiver; IF filter; MathCAD calculation algorithm; UC3842; electromagnetic interference; flyback converter; frequency jitter; frequency modulation theory; peak amplitude reduction; switching power supply; Detectors; Electromagnetic interference; Filters; Frequency modulation; Jitter; Power supplies; Predictive models; Prototypes; Switching frequency; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005

ISSN

0197-2618

Print_ISBN

0-7803-9208-6

Type

conf

DOI

10.1109/IAS.2005.1518855

Filename

1518855