Abstract
This paper proposes a triangular modulation with zero current switching (ZCS) for a hybrid Si-SiC isolated bidirectional DC-DC converter (IBDC). Three of the four legs in the IBDC operate at ZCS and use Si IGBTs, while the fourth operates at zero voltage switching (ZVS) and uses SiC MOSFET. In that case, the turn-off switching losses are concentrated regardless of the direction of the power. The main contribution of this paper resides in the proposed dead-band compensation mechanism. This dead-band compensation is crucial when addressing ZCS modulation and improves the overall efficiency of the full operating range. As a co-benefit, the proposed mix of semiconductor technologies can result in an effective cost reduction compared with a full SiC IBDC. The paper contains a detailed explanation of the implemented modulation applied to an IBDC. The paper contributes to deploy a theoretical implementation where the effect of parasitic capacitance on semiconductors during the dead-band is analytically considered. The presented method results are validated on a laboratory set-up using a 20 kW - 40 kHz hybrid Si-SiC IBDC.
Highlights
The penetration of batteries for local storage and electric vehicles (EVs) is increasing day by day
This paper proposes a modulation technique based on zero current switching (ZCS) in three of the four legs because it provides better performance than zero voltage switching (ZVS) in high power Dual active bridge (DAB) converters where IGBTs are commonly used [20]
This paper proposes a hybrid Si-SiC DAB solution taking advantage of lower IGBTs cost, which has been implemented in legs that switch at zero current, avoiding that IGBT tail current generates high turn-off losses
Summary
The penetration of batteries for local storage and electric vehicles (EVs) is increasing day by day. This paper proposes a modulation technique based on ZCS in three of the four legs because it provides better performance than ZVS in high power DAB converters where IGBTs are commonly used [20]. The paper provides an exhaustive dead-band analysis in the DPS triangular ZCS modulation strategy This detailed analysis is complemented with an analytically deadband (DB) compensation proposal to reduce switching losses caused by the flow-back current oscillations. This paper proposes a hybrid Si-SiC DAB solution taking advantage of lower IGBTs cost, which has been implemented in legs that switch at zero current, avoiding that IGBT tail current generates high turn-off losses.
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