Abstract
This paper presents a cascaded H-bridge multilevel boost inverter for electric vehicle (EV) and hybrid EV (HEV) applications implemented without the use of inductors. Currently available power inverter systems for HEVs use a dc-dc boost converter to boost the battery voltage for a traditional three-phase inverter. The present HEV traction drive inverters have low power density, are expensive, and have low efficiency because they need a bulky inductor. A cascaded H-bridge multilevel boost inverter design for EV and HEV applications implemented without the use of inductors is proposed in this paper. Traditionally, each H-bridge needs a dc power supply. The proposed design uses a standard three-leg inverter (one leg for each phase) and an H-bridge in series with each inverter leg which uses a capacitor as the dc power source. A fundamental switching scheme is used to do modulation control and to produce a five-level phase voltage. Experiments show that the proposed dc-ac cascaded H-bridge multilevel boost inverter can output a boosted ac voltage without the use of inductors.
Original language | English |
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Pages (from-to) | 963-970 |
Number of pages | 8 |
Journal | IEEE Transactions on Industry Applications |
Volume | 45 |
Issue number | 3 |
DOIs | |
State | Published - 2009 |
Funding
Paper IPCSD-08-070, presented at the 2007 Industry Applications Society Annual Meeting, New Orleans, LA, September 23–27, and approved for publication in the IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS by the Industrial Power Converter Committee of the IEEE Industry Applications Society. Manuscript submitted for review January 6, 2008 and released for publication September 30, 2008. Current version published May 20, 2009. This work was supported by the Oak Ridge National Laboratory, Oak Ridge, TN, which is managed by UT-Battelle for the U.S. Department of Energy under Contract DE-AC05-00OR22725.
Keywords
- Cascaded H-bridge multilevel boost inverter
- Electric vehicle (EV)/hybrid electric vehicle (HEV)