Abstract
This paper presents a new class of multilevel inverters based on a multilevel dc link (MLDCL) and a bridge inverter to reduce the number of switches, clamping diodes or capacitors. An MLDCL can be a diode-clamped phase leg, a flying capacitor phase leg, or cascaded half-bridge cells with each cell having its own dc source. A multilevel voltage source inverter can be formed by connecting one of the MLDCLs with a single-phase bridge inverter. The MLDCL provides a dc voltage with the shape of a staircase approximating the rectified shape of a commanded sinusoidal wave, with or without pulse width modulation, to the bridge inverter, which in turn alternates the polarity to produce an ac voltage. Compared with the cascaded H-bridge, diode-clamped and flying-capacitor multilevel inverters, the MLDCL inverters can significantly reduce the switch count as the number of voltage levels increases. For a given number of voltage levels, m, the required number of active switches is 2×(m-1) for the existing multilevel inverters but is m+3 for the MLDCL inverters. Simulation and experimental results are included to verify the operating principles of the MLDCL inverters.
| Original language | English |
|---|---|
| Pages (from-to) | 806-812 |
| Number of pages | 7 |
| Journal | Conference Record - IAS Annual Meeting (IEEE Industry Applications Society) |
| Volume | 2 |
| State | Published - 2004 |
| Event | Conference Record of the 2004 IEEE Industry Applications Conference; 39th IAS Annual Meeting - Seattle, WA, United States Duration: Oct 3 2004 → Oct 7 2004 |
Keywords
- Cascaded half-bridge
- Diode-clamped
- Flying capacitor
- Multilevel dc link
- Multilevel inverter
- Reduced part count