A Single-phase quasi-switched boost H-bridge inverter with power loss reduction capability

Abstract

This paper proposes a novel single-phase quasi-switched boost H-bridge inverter (qSB-HBI) topology combined with a hybrid pulse-width modulation (HPWM) strategy to enhance power conversion efficiency and minimize the requirement for passive components. By integrating the boost and inverter stages into a single power stage, the proposed topology simultaneously achieves voltage boosting and inversion with fewer components compared to conventional impedance-source inverter (ISI) structures. In traditional PWM-based inverters, the double-line-frequency (2ω) power oscillation causes significant DC-link voltage oscillations, requiring large inductors and capacitors. To overcome this issue, the proposed HPWM method combines pulse-width modulation (PWM) and pulse-amplitude modulation (PAM) techniques, allowing the DC-link voltage to oscillate within a controlled range while maintaining high output voltage quality. This approach effectively reduces switching frequency, switching losses, and the size of passive elements. The proposed configuration is capable of buck–boost operation. Experimental verification on a 1-kW laboratory prototype confirms that the proposed configuration achieves lower losses, smaller DC-link capacitance, and significantly improved output voltage quality.