Abstract
In this paper, a new active-clamped three-phase current-fed push-pull dc-dc converter is proposed for high-power applications where low-voltage high-current input sources such as fuel cells are used. The proposed converter has the following features: active clamping of the transient surge voltage caused by transformer leakage inductances, natural zero-voltage switching turn-on of main switches using energy stored in transformer leakage inductor, small current rating and zero-voltage and zero-current switching of clamp switches, no additional start-up circuitry for soft starting due to the operating duty cycle range between 0 and 1, and zero-current switching turn-off of rectifier diodes leading to negligible voltage surge associated with the diode reverse recovery. A comparative study along with loss analysis is performed. Experimental results from 5-kW laboratory prototypes of the proposed active-clamped converter and the passive-clamped converter are provided.
| Original language | English |
|---|---|
| Article number | 5654655 |
| Pages (from-to) | 2266-2277 |
| Number of pages | 12 |
| Journal | IEEE Transactions on Power Electronics |
| Volume | 26 |
| Issue number | 8 |
| DOIs | |
| State | Published - 2011 |
Keywords
- Active clamp
- current-fed
- fuel cells
- push-pull
- three-phase dc-dc converter
- three-phase transformer
- zero voltage switching (ZVS)
