Diode-clamped Three-Level Dual Buck Inverter

摘要

Dual Buck inverter (DBI) is a new topology which has the characteristics of high frequency and efficiency. But the output voltage of the bridge is a bipolar PWM waveform and voltage stress of the component in DBI is high, just like the half bridge inverter. To overcome these problems, a novel three-level DBI, which has unipolar PWM output waveforms and low voltage stress, is presented in this paper. And the half load-cycle operation mode of DBI is remained in it. But over-voltage may occur if the current of inductor is discontinuous. To solve this problem, a diode-clamped three-level DBI is adopted, then the bridge voltage could be clamped, the volume and weight of magnetic component are reduced at the same time. The merits of DBI such as high efficiency and reliability are remained at the same time. The above analyses are proved to be true through the experimental results.