Impact of DC Link Pulse Coding on the Harmonic Distortion of the High-Frequency-Link Inverter

This paper presents the effects of information coding at the pulsating dc link on the performance of the high-frequency-link (HFL) inverter. The asymmetrical duty-cycle phase-shift modulation (resulting in pulse placement) of the front-end of the HFL inverter yields reduced frequency of the pulsating dc link voltage. It also results in reduced total harmonic distortion (THD) of the inverter output current and extended soft-switching range. Soft-switching and lower harmonic losses due to reduced THD yield higher inverter output (better source utilization) and higher efficiency. The enhanced performances are verified by the experiment results and comparisons.