Conducted EMI Suppression Using Power Semiconductor Filter With Dynamic Ramp Modulation to Regulate Series Pass Device Voltage

• Published in: IEEE transactions on power electronics Vol. 36; no. 6; pp. 6608 - 6623
• Main Authors: Zhang, Kun, Fan, John Wing-to, Tung, Chung-Pui, Chung, Henry Shu-Hung
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.06.2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Active electromagnetic interference (EMI) filter; Circuit boards; Circuit design; Circuits; Converters; dynamic ramp modulation; Electric potential; Electromagnetic interference; Harmonic analysis; Impedance; Inductance; Low level; Performance degradation; power factor correction; Power management; power semiconductor filter (PSF); Printed circuits; Prototypes; Resonant frequencies; Resonant frequency; Switches; Switching; Switching frequency; Voltage; Voltage control
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2020.3037416

The concept of the power semiconductor filter (PSF) is based on utilizing a series pass device (SPD) operated in linear mode to regulate the input current of switching converters. In order to avoid input current oscillation, a fixed-frequency dynamic ramp modulator has been proposed. It is based on operating the converter at a fixed switching frequency and setting the switching frequency away from the grid-side resonant frequency. Regardless of the input variation, the voltage across the SPD is also maintained at a low level by a dynamic ramp, resulting in low power dissipation in the SPD. An optimized fast-current regulation circuit is designed to achieve high conducted electromagnetic interference (EMI) suppression. A method to predict the EMI suppression performance of the PSF has been proposed in this article. Furthermore, the ground loop inductance in the fast-current regulation circuit has been analyzed, and PCB layout guidelines have been given to mitigate the performance degradation of the PSF caused by this inductance. A 100-W, 90-264 Vac/200 Vdc buck-boost PFC prototype has been built and evaluated; the prototype with the PSF satisfies EMC standard EE55015 class B in the whole range of 150 kHz to 30 MHz.