A novel transistor-less power decoupling solution for single-phase inverters

This paper introduces a novel active method for power decoupling in single-phase PWM inverters, which has the main advantage of not requiring additional switching components, besides the inverter H-bridge. The proposed transistor-less power decoupling solution requires two AC capacitors placed on each inverter leg, while an original control method ensure both the primary function of the inverter and the transfer of the double frequency pulsating power towards the decoupling capacitors. By this solution, the required DC capacitor is substantially reduced and so increasing the inverter lifetime, whereas requiring no additional semiconductors makes it more reliable and less expensive than other solutions. The performed analysis based on simulation results show that the proposed inverter performs as claimed.