Loading [a11y]/accessibility-menu.js
EMI-Regulated GaN-Based Switching Power Converter With Markov Continuous Random Spread-Spectrum Modulation and One-Cycle on-Time Rebalancing | IEEE Journals & Magazine | IEEE Xplore

EMI-Regulated GaN-Based Switching Power Converter With Markov Continuous Random Spread-Spectrum Modulation and One-Cycle on-Time Rebalancing


Abstract:

To meet stringent electromagnetic interference (EMI) requirements in modern integrated systems, this article presents a gallium nitride (GaN)-based switching power conver...Show More

Abstract:

To meet stringent electromagnetic interference (EMI) requirements in modern integrated systems, this article presents a gallium nitride (GaN)-based switching power converter operating at 8.3 MHz. It employs a Markov continuous random spread-spectrum modulation (RSSM) technique to spread EMI spectra almost uniformly, and thus attenuate EMI level effectively. On the other hand, a one-cycle ON-time rebalancing scheme is designed to stabilize the duty-ratio of the converter even if the switching frequency changes randomly, suppressing the output voltage jittering without influencing the EMI reduction by RSSM. A prototype was designed and fabricated using a 0.18-μm HV CMOS process. With ±10% modulation range of a nominal switching frequency of 8.3 MHz, peak EMI is reduced from 66 to 35 dBμV at the fundamental frequency and from 62 to 27 dBμV at the third-order harmonic. In the meantime, the RSSM-induced output voltage jittering is suppressed from 240 to below 10 mV. The converter achieves above 60% efficiency over 96.6% of 7.5-W full power range, with a peak efficiency of 86.8% at 6.25 W.
Published in: IEEE Journal of Solid-State Circuits ( Volume: 54, Issue: 12, December 2019)
Page(s): 3306 - 3315
Date of Publication: 12 August 2019

ISSN Information:

Funding Agency:


References

References is not available for this document.