Full soft switching high step up current fed dc dc converters with reduced conduction losses

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Full Soft-Switching High Step-Up Current-Fed DC-DC Converters with Reduced Conduction Losses

ABSTRACT: Two variants of the full soft-switching high step-up DC-DC converter are proposed. The main advantage of the converters is the minimized conduction losses by the use of the four-quadrant switches and a specific control algorithm. Simulation was performed to verify the principle of operation and to estimate the losses.

KEYWORDS: 1. DC-DC power converters 2. Photovoltaic systems 3. Soft switching 4. Step-up 5.

Isolated

SOFTWARE: MATLAB/SIMULINK

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ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail:asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in

0-9347143789/9949240245 CIRCUIT DIAGRAM:

Fig. 1. Full soft-switching high step-up DC-DC converter

Fig. 2. Proposed converter topology with four four-quadrant switches.

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0-9347143789/9949240245 EXPECTED SIMULATION RESULTS:

Fig. 3. Simulated voltage and current waveforms of S1 (a), S2 (b), S7.1 (c), S5 (d) for the proposed converter topology with a single four-quadrant switch

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CONCLUSION: The proposed converters allow soft-switching of the both inverter and rectifier switches without any auxiliary passive elements and clamping circuits.

As seen from simulation results, the topology with a single four-quadrant switch has higher efficiency than the topology with four four-quadrant switches, but at the same time, it has few disadvantages that could affect the final choice of topology: - Step-up factor is slightly lower than in the topology with four four-quadrant switches; - The switching interval e (and the symmetrical interval in another half-period) must be of strictly right duration, which is equal to the time of current redistribution between switches S4 and S2. The shorter duration of this interval will result in high switching losses and, in extreme cases, can lead to damage of the switch S4. The significantly longer duration will result in current increase through the switch S2 and eventually may result in the boost inductor saturation.

- The original topology and the topology with four four quadrant switches does not have the problem with the longer duration of this switching interval and so they have lower requirements to the control system in dynamic mode. This means that proposed converter with four fourquadrant switches allows robust soft-switching commutation, which is hard to achieve in galvanically isolated current-fed DCDC converters.

The main disadvantage of the topologies is the presence of four switches in series in the inverter stage on the path of the current flow during the energy transfer interval. This leads to the conduction losses higher than in the conventional phase shifted full-bridge topology.

Nevertheless the switching losses are lower due to the introduced soft-switching. It means that switching frequency could be increased while maintaining the efficiency at acceptable level.

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0-9347143789/9949240245 Future work will be devoted to the experimental verification of the proposed converters and further control algorithm optimization.

REFERENCES: [1] A. Blinov, D. Vinnikov, and V. Ivakhno, “Full soft-switching high stepup dc-dc converter for photovoltaic applications,” 2014 16th European Conference on Power Electronics and Applications (EPE’14-ECCE Europe), pp. 1–7, Aug 2014.

[2] Y. Sokol, Y. Goncharov, V. Ivakhno, V. Zamaruiev, B. Styslo, M. Mezheritskij, A. Blinov, and D. Vinnikov, “Using the separated commutation in two-stage dc/dc converter in order to reduce of the power semiconductor switches’ dynamic losses,” Energy Saving. Power Engineering. Energy Audit, 2014.

[3] A. Blinov, V. Ivakhno, V. Zamaruev, D. Vinnikov, and O. Husev, “Experimental verification of dc/dc converter with full-bridge active rectifier,” 38th Annual Conference on IEEE Industrial Electronics Society (IECON 2012), pp. 5179–5184 , Oct 2012.

[4] R.-Y. Chen, T.-J. Liang, J.-F. Chen, R.-L. Lin, and K.-C. Tseng, “Study and implementation of a current-fed full-bridge boost dc-dc converter with zero-current switching for high-voltage applications,” IEEE Transactions on Industry Applications, vol. 44, no. 4, pp. 1218–1226, July 2008.

[5] J.-F. Chen, R.-Y. Chen, and T.-J. Liang, “Study and implementation of a single-stage currentfed boost pfc converter with zcs for high voltage applications,” IEEE Transactions on Power Electronics, vol. 23, no. 1, pp. 379–386, Jan 2008.

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