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The performance, including efficiency, harmonics and dead-time effect of the three major digital sinusoidal pulse width modulations (DSPWMs) presented in Part 1 are investigated in this study using a 2 kVA single-phase full-bridge inverter. Each DSPWM is implemented using a low-cost 8-bit micro-controller and the effect of different switching frequencies on the inverter performance is analysed and the inverter switching, conduction and transformer losses investigated. The experimental results confirm the validity of the mathematical and simulation analysis presented in Part 1. The work shows that the type of DSPWM used for a single-phase full-bridge inverter and the switching frequency selected can have a significant effect on the inverter performance and that switch and transformer losses make up the majority of the inverter losses. [ABSTRACT FROM AUTHOR]

Nowadays, Digital Sinusoidal Pulse Width Modulation (DSPWM) is playing a major role in the generation of pure sinusoidal waveforms using micro-controller based inverters (Kawabata, Miyashita and Yamamoto 1991; Herrmann, Langer and Broeck 1993; Ying-Yu 1995; PICREF-1 1997; Shih-Liang, Meng-Yueh, Jin-Yi, Li-Chia and Ying-Y 1999; The Electrical Engineering Handbook 2000; Koutroulis, Chatzakis, Kalaitzakis and Voulgaris 2001; Skvarenina 2002; Pop, Chindris and Dulf 2004; Zhongyi, Mingzhu and Yan 2005). The types of DSPWM that can be generated depend on the micro-controller hardware resources and are therefore limited, but provide performance benefits not possible with an analogue controller. For instance, digital controllers offer a programmable solution and therefore more flexibility, as advanced algorithms and additional features can be added to the system in software instead of hardware (Monti, Santi, Dougal, and Riva 2003; Brush 2005). Digital controllers are also less sensitive to environmental conditions and show precise behaviour compared with their analogue counterparts (Skvarenina 2002). This two-part article looks at the benefits and limitations of three major DSPWMs for a single-phase full-bridge inverter and investigates their performance. In Part 1, the theory of the three major DSPWMs are presented, including mathematical models and simulation results. It looks at the PWM patterns required to generate these DSPWMs and the benefits and limitations of each. To evaluate the proposed mathematical models and simulation results, a 2kVA single-phase full-bridge inverter was developed and the DSPWMs implemented. In Part 2, experimental results from the implementation of the DSPWMs on the prototype 2kVA inverter are presented, which confirms the validity of the proposed analysis in Part 1. Moreover, the performance, including efficiency and losses (switching, conduction, and transformer) of the different DSPWMs implemented on the 2kVA inverter under different loads were examined and recommendations presented. [ABSTRACT FROM AUTHOR]