Abstract
The cascaded H-bridge multilevel inverter (MLI) requires separate isolated dc sources to generate more than three voltage levels and to generate higher output voltage. This paper proposes a newMLI topology that requires only one dc source and is capable of generating seven voltage levels with triple voltage boosting gain. Three H-bridges are interconnected through two bidirectional voltage blocking switches to enable the integration of two switched-capacitors. Unlike the existing two-stage structure switched-capacitor-based MLI, the proposed MLI is a single-stage topology. It alleviates the voltage stress across switches such that low voltage stress of not more than the dc source voltage is ensured on all switches. In addition, capacitors voltage balancing is achieved automatically during operation. The operation of the proposed MLI is analyzed followed by verification through simulation and experimental test of a low power/voltage prototype.
Highlights
Multilevel inverters (MLIs) have been an emerging power electronics technology with promising developments and growing importance for dc-ac electrical energy conversion system [1], [2]
While retaining the use of two switched-capacitors, the proposed MLI topology is accomplished with only singlestage configuration
A new single-phase MLI topology integrated with the switched-capacitor concept has been established in this paper
Summary
Multilevel inverters (MLIs) have been an emerging power electronics technology with promising developments and growing importance for dc-ac electrical energy conversion system [1], [2] They are exceptionally popular for high/medium voltage applications and envisaged to continue garner continuous attention in the near future. Parallel connection between the half-bridge and the T-type inverter can effectively increase the number of voltage level. The floating capacitor connected to the H-bridge is charged to quarter of the dc source voltage and enable up to seven voltage levels generation. Attention should be drawn to the fact that multiple isolated dc sources are inevitable in these topologies if higher output voltage is desired In this sense, the incorporation of the so-called switched-capacitor circuit into MLIs is recently attempted to increase the voltage boosting gain [17]–[24].
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