Adaptive Resonant DC-Link Boost Inverter with Low-Distortion PWM Strategy

This paper presents the design and implementation of a DC-link Quasi-Switched Boost Inverter (QSBI) integrating a Zero-Voltage Switching (ZVS) quasi-resonant boost converter with a single-phase H-bridge inverter. The proposed system aims to achieve high efficiency, reduced switching losses, and improved power quality in DC–AC conversion. A 24 V DC input is processed through the ZVS quasi-resonant boost converter to obtain a higher DC-link voltage with soft-switching operation. The ZVS condition minimizes switching losses, electromagnetic interference, and device stress, thereby enhancing system efficiency and reliability. The boosted output is regulated using a relay based control mechanism and monitored through voltage sensing circuits. An improved pulse width modulation (PWM) technique is implemented using a microcontroller to control the H-bridge inverter, ensuring reduced harmonic distortion and improved output waveform quality. The inverter output is further stepped up using a transformer to drive AC loads. Experimental results demonstrate improved voltage gain, reduced switching losses, and enhanced output performance compared to conventional boost inverter systems. The proposed system is suitable for renewable energy applications, battery-powered inverters, and low-cost power conversion systems