SPLTRAK Abstract Submission
Seven-Level Cascaded H-Bridge Multilevel Single-Phase Inverter Implemented with an ATMEGA Microprocessor
Edgardo Desarden-Carrero1, Rachid Darbali-Zamora2, Erick Aponte-Bezares1, Eduardo I. Ortiz-Rivera1
1University of Puerto Rico-Mayaguez, MAYAGUEZ, PR, United States
/2Sandia National Laboratories, Albuquerque, NM, United States

An inverter is a power electronics circuit that can convert DC power into AC power.  Inverters have a wide range of applications, from battery-powered devices’ power supplies to renewable energy systems such as photovoltaics.  Typically, inverters rely on switching devices to create an AC signal.  The circuit topology refers to the arrangement of the switching devices.  In most cases, these switching devices are arranged in the form of an H-bridge. Although most inverters rely on utilizing a single H-bridge to achieve either two or three levels, the use of multiple H-bridges can reach various levels.  This proves advantageous when reducing total harmonic (THD) to minimize harmonics.  A low-cost, seven-level multilevel single-phase inverter based on cascade H-bridges connections and PWM voltage modulation was developed using an ATMEGA microprocessor.  The multilevel inverter can supply up to 30W with an RMS output voltage of 120 V, 60 Hz, and a THD less than 30% without a lowpass filter.  Three 18V batteries are used to provide the primary DC voltage.  The ATMEGA-based inverter prototype is tested under various lighting load technologies, including filament, compact fluorescent light, and a light-emitting diode.