used with upss in which an input ac voltage is converted to a dc voltage and one of the converted dc voltage and a dc voltage provided from a battery powered dc voltage source is provided to an input of the inverter to create the ac output voltage of the ups in addition as understood by those skilled in the art inverters in accordance with embodiments of the present invention may also be used in systems and devices other than uninterruptible power supplies in the inverter 200 described above mosfet devices are used as the switches s 1 s 6 as understood by those skilled in the art a number of other electrical or mechanical switches such as igbt 39 s with integral rectifiers or bipolar transistors having a diode across the c e junction may be used to provide the functionality of the switches further in embodiments of the present invention each of the switches s 1 s 6 need not be implemented using the same type of switch in embodiments of the invention discussed above an inductor is used as a resonant element in inverter circuits as understood by one skilled in the art other devices having a complex impedance may be used in place of the inductor however it is desirable that any such device be primarily inductive in nature in the embodiments of the present invention described above energy is returned from the inductor to the voltage source after the load capacitance has been discharged as understood by those skilled in the art the voltage source may include a battery that receives the energy from the inductor or the voltage source may include a storage device other than a battery such as a capacitor coupled in parallel across the voltage source that receives the energy.