Based on similar concept, another three dual-mode double-carrier based SPWM
inverters are proposed. With both step-up and step-down functions, this type of inverter
can achieve high efficiency in a wide range because only one switch operates at the
PWM frequency at a time.
Finally, the simulation and experiment results are shown to verify the concept and
the tested CEC (California Energy Commission) efficiency is 97.4%. It performs up to 2%
more efficiently better than the conventional solution.