| Autor: |
Ibanez, Federico Martin, Echeverria, Jose Martin, Vadillo, Javier, Fontan, Luis |
| Zdroj: |
IEEE Journal of Emerging and Selected Topics in Power Electronics; September 2016, Vol. 4 Issue: 3 p1026-1035, 10p |
| Abstrakt: |
This paper presents the analysis of a bidirectional series-resonant converter (SRC) for light loads working above or below resonance. In normal operation (heavy load), it is well known that the SRCs have a maximum voltage conversion ratio ( $m$ ) equal to one. This occurs when the switching frequency ( $f_{S}$ ) equals the resonant frequency ( $f_{0})$ and power losses are neglected. This maximum can also be obtained for $f_{S}<f_{0}$ when the switches are turned ON during a half-resonant period. Thus, zero-current switching can be achieved at both the turn-ON and turn-OFF processes. However, anomalous step-up behavior is found when the converter is attached to light loads. A comprehensive analysis of this phenomenon in the time-domain and in the state plane is presented. Based on the latter, an expression that estimates $m$ and shows the influences of the parameters is obtained. With the aid of this expression, a solution that mitigates that effect is presented and implemented in a prototype, which is part of a bidirectional power chain for supercapacitors. This solution can be implemented for both $f_{S}>f_{0}$ and $f_{S}<f_{0}$ . |
| Databáze: |
Supplemental Index |
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