Title: Realising ZVS and ZCS in a continuous conduction boost converter with boundary mode control

Authors: Nagesh Vangala; Srinivasa Rao Gorantla; Rayudu Mannam

Addresses: Chirra Engineers Pvt. Ltd., Vignan's University, Bangalore 560062, India ' Vignan's University, Vadlamudi Guntur 522213, India ' Chirra Engineers Pvt. Ltd., Vignan's University, Bangalore 560062, India

Abstract: Boost regulators working in the continuous conduction mode (CCM) are very popular in switch-mode power conversion. This configuration is widely adapted for power factor correction (PFC) in switch mode AC to DC converters. For lower power levels of up to 200 watts, boundary conduction mode (BCM) PFC is adapted, and for power requirements beyond about 200 W, CCM boost with average current control scheme is favoured. A novel technique is proposed in this paper to achieve complete soft-switching viz. Zero voltage switching and zero current switching for the main boost switch in CCM mode. The uniqueness of the scheme lies in not adding any auxiliary MOSFET switch and/or control algorithm. All the switching elements exhibit soft-switching, thus improving efficiency and reducing the EMI considerably. Most of the reported techniques for soft switching in CCM boost utilise additional active switches. A working model is fabricated to demonstrate and validate the scheme. The test results and the waveforms are presented and analysed. An 800 watts PFC converter exhibiting complete soft switching is built using the proposed technique and is evaluated for its performance.

Keywords: boost converter; continuous conduction mode; CCM; ZVS; ZCS; soft switching; PFC pre-regulator; variable frequency; resonant converter; CCM; BCM control.

DOI: 10.1504/IJPT.2020.109659

International Journal of Powertrains, 2020 Vol.9 No.3, pp.171 - 185

Received: 29 Jun 2019
Accepted: 04 Sep 2019
Published online: 18 Sep 2020 *

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