The authors have proposed a soft switching SAZZ (Snubber Assisted Zero Voltage and Zero Current Transition) chopper circuits for the FCEV applications, and verified the high efficiency at 100 kHz switching frequency and 8 kW output. The SAZZ circuit topology can be extended to a bilateral SAZZ chopper for HEV. A new SAZZ bilateral buck-boost chopper circuit (SAZZ-1) with boost and buck capabilities in any direction is presented in this paper, and the performance verifications through simulations and experiments will be described. A very high efficiency is obtained even at the very high switching frequency. The EMI noise is reduced due to the soft switching, and due to the low loss the energy density will be increased drastically. The experimental results, 96.57 % efficiency at 25 kW with boost mode (input: 250 V/output: 390 V) in forward direction and 97.44 % efficiency at 25 kW with buck mode (input: 420 V/output: 300 V) in forward direction were obtained. The chapter 2 describes the topology of the proposed circuit, and the operation principles are presented in the chapter 3. The simulation and experimental results are shown in the chapter 4 and the chapter 5 is the conclusions.
50 kHz-25 kW bilateral chopper circuit SAZZ-1 for HEV
Bilaterale Chopper-Schaltung SAZZ-1 mit 50 kHz und 25 kW für elektrische Hybridfahrzeuge
2006
10 Seiten, 13 Bilder, 4 Tabellen, 3 Quellen
Conference paper
Storage medium
English
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