Isolated ZVT boost converter with switched capacitors and coupled inductors

An interleaved and isolated boost converter with switched capacitors is proposed in this paper. The switched capacitors are used to realize the inherent voltage-lift function which increases the voltage gain and reduces the turns ratio of the transformers greatly. Because the transformers can operate in flyback and forward modes which make part of the output energy stored in the switched capacitors, the size of magnetic components can be reduced. Moreover, the load current can be auto-shared by each phase according to capacitor charge balance. Active clamp circuits are applied for the interleaved two phases to recycle the leakage energy and absorb the voltage spikes caused by the leakage inductance. Both the main and the clamp switches are ZVT performances during the whole switching transition which reduce the switching losses. Since the current falling rates of the clamping and output diodes when they turn-off are controlled by the leakage inductance, the diode reverse-recovery problem is alleviated. The experimental results based on a 1 kW 48 V-to-380 V DC/DC prototype verify the effectiveness of the theoretical analysis.

[1]  Jun Wen,et al.  A new interleaved isolated boost converter for high power applications , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..

[2]  A. Consoli,et al.  A Multi-stage Converter for Domestic Generation Systems Based on Fuel Cells , 2006, Conference Record of the 2006 IEEE Industry Applications Conference Forty-First IAS Annual Meeting.

[3]  Fred C. Lee,et al.  High performance coupled-inductor DC-DC converters , 2003, Eighteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2003. APEC '03..

[4]  T. Senjyu,et al.  Feedforward maximum power point tracking of PV systems using fuzzy controller , 2002 .

[5]  L. Balogh,et al.  Power-factor correction with interleaved boost converters in continuous-inductor-current mode , 1993, Proceedings Eighth Annual Applied Power Electronics Conference and Exposition,.

[6]  Wuhua Li,et al.  A new soft switching snubber for the interleaved boost converters , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[7]  J.R. Pinheiro,et al.  Generalized switching logic scheme for CCM-PFC interleaved boost converters , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[8]  R. Leyva,et al.  Sliding-mode control of interleaved boost converters , 2000 .

[9]  Po-Wa Lee,et al.  Steady-state analysis of an interleaved boost converter with coupled inductors , 2000, IEEE Trans. Ind. Electron..

[10]  Jih-Sheng Lai,et al.  Parasitic ringing and design issues of digitally controlled high power interleaved boost converters , 2004, IEEE Transactions on Power Electronics.

[11]  J.-J. Huselstein,et al.  Multicell Interleaved Flyback Using Intercell Transformers , 2007, IEEE Transactions on Power Electronics.

[12]  E.C. dos Santos,et al.  Reducing the inductor size and current stress by interleaved bidirectional boost rectifiers used for power factor correction , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..