A CURRENT FED TWO-INDUCTOR BOOST CONVERTER FOR GRID INTERACTIVE PHOTOVOLTAIC APPLICATIONS

A current fed two-inductor boost converter is combined with a low frequency unfolder stage to produce a Module Integrated Converter (MIC) for photovoltaic applications. A two-phase buck converter with an interphase transformer is modulated to produce a rectified sinusoid waveform as an input to the fixed duty cycle two-inductor boost cell. The boost cell features an integrated magnetics approach to combine the two inductors and the transformer cores, non-dissipative snubbers to recover switching losses and silicon carbide output rectifiers. The MIC interfaces with the mains via an unfolder stage which uses optically driven mosfets as switching elements. Experimental results for a converter with an average power of 50 W are provided.

[1]  Peter J. Wolfs.  A current-sourced DC-DC converter derived via the duality principle from the half-bridge converter , 1993, IEEE Trans. Ind. Electron..

[2]  Pavel Ivanov,et al.  High voltage SiC diodes with small recovery time , 2000 .

[3]  Peng Xu,et al.  Investigation of candidate VRM topologies for future microprocessors , 2000 .

[4]  B. R. Pelly,et al.  Thyristor Phase-Controlled Converters and Cycloconverters: Operation, Control, and Performance , 1971 .

[5]  F. P. Dawson,et al.  DC-DC converter interphase transformer design considerations: volt-seconds balancing , 1990 .

[6]  Jacobus D. Van Wyk,et al.  Transistor Inverter Design Optimization in the Frequency Range Above 5 kHz Up to 50 kVA , 1983, IEEE Transactions on Industry Applications.

[7]  P. Wood,et al.  Synchronous rectifiers versus Schottky diodes: a comparison of the losses of a synchronous rectifier versus the losses of a Schottky diode rectifier , 1994, Proceedings of 1994 IEEE Applied Power Electronics Conference and Exposition - ASPEC'94.

[8]  M. J. Kumar,et al.  Lateral thin-film Schottky (LTFS) rectifier on SOI: a device with higher than plane parallel breakdown voltage , 2002 .

[9]  Gordon Ed Bloom,et al.  The generalized use of integrated magnetics and zero-ripple techniques in switchmode power converters , 1984, 1984 IEEE Power Electronics Specialists Conference.

[10]  Vassilios G. Agelidis,et al.  Inverters for single-phase grid connected photovoltaic systems-an overview , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).