ABSTRACT
DC/AC inverters convert DC source energy for AC users, and are a big category of power electronics. Power electronics is the technology to process and control the flow of electric energy by supplying voltages and currents in a form that is optimally suited for user loads. The spectrum of a periodic function in the time domain is a discrete function in the frequency domain. For a nonperiodic function in the time domain, it is possible to represent it by Fourier integration. DC/AC conversion techniques can be grouped into two categories: pulse width modulation (PWM) and multilevel modulation. The PWM method is suitable for DC/AC conversion since the input voltage is usually a constant DC voltage. The soft switching technique has been widely used in switching circuits for a long time. It effectively reduces the power losses of equipment and greatly increases the power transfer efficiency.
