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Zero-Voltage Switching Galvanically Isolated Current-Fed FullBridge DC-DC Converter ABSTRACT: This paper presents a new soft-switching technique for the current-fed full-bridge DC-DC converter that enables zero voltage switching of the input side inverter switches. To achieve this, the secondary side voltage doubler rectifier has to be realized with active switches. Two control channels synchronous with the control signals of the inverter switches are added for driving those switches. Zero voltage switching achieved is assisted with the body diodes that conduct current during soft-switching transients as a result of the leakage inductance current shaping from the secondary side. Moreover, the converter does not suffer from voltage overshoots thanks to natural clamping from the secondary side. Theoretical predictions were verified with simulation.
KEYWORDS: 1. Zero-voltage switching 2. Current-fed DC-DC converter 3. Full-bridge 4. Soft-switching 5. Switching` control method
SOFTWARE: MATLAB/SIMULINK
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0-9347143789/9949240245 CIRCUIT DIAGRAM:
Fig. 1. Galvanically isolated full-bridge current-fed DC-DC converter with controlled output rectifier stage.
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EXPECTED SIMULATION RESULTS:
Fig. 2. Simulated current and voltage waveforms along with control signals
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0-9347143789/9949240245 of the input and output side switches.
Fig. 3. Experimental current and voltage waveforms.
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CONCLUSION: The novel ZVS technique intended for the galvanically isolated full-bridge current-fed DC-DC converter with the controlled output rectifier stage were presented. It enables full ZVS in the input side current-fed inverter assisted with the leakage inductance and body diodes. Moreover, partial ZCS is provided in the secondary side assisted with the leakage inductance. Simulation study corroborates the theoretical predictions made. Experimental prototype operation was quite similar to the simulation model created in PSIM. Nevertheless, the prototype features oscillations caused by parasitic elements of the circuit and reverse recovery of the body diodes the input side MOSFETs. Further research will be aimed towards derivation of design guidelines that take into account reverse recovery effect and, consequently, result in high efficiency and low parasitic oscillations.
REFERENCES: [1] Blaabjerg, F.; Zhe Chen; Kjaer, S.B., "Power electronics as efficient interface in dispersed power generation systems," IEEE Transactions on Power Electronics, vol. 19, no. 5, pp. 11841194, Sept. 2004. [2] Kouro, S.; Leon, J.I.; Vinnikov, D.; Franquelo, L.G., "Grid-Connected Photovoltaic Systems: An Overview of Recent Research and Emerging PV Converter Technology," IEEE Industrial Electronics Magazine, vol. 9, no. 1, pp. 47-61, March 2015. [3] Rathore, A.K.; Prasanna, U., "Comparison of soft-switching voltage-fed and current-fed bidirectional isolated Dc/Dc converters for fuel cell vehicles," in Proc. ISIE’2012, pp. 252-257, 28-31 May 2012. [4] Prasanna, U.R.; Rathore, A.K., "Extended Range ZVS Active-Clamped Current-Fed FullBridge Isolated DC/DC Converter for Fuel Cell Applications: Analysis, Design, and For Simulation Results of the project Contact Us
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ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail:asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in
0-9347143789/9949240245 Experimental Results," IEEE Transactions on Industrial Electronics, vol. 60, no. 7, pp. 26612672, July 2013. [5] Iannello, C.; Shiguo Luo; Batarseh, I., "Small-signal and transient analysis of a full-bridge, zero-current-switched PWM converter using an average model," IEEE Transactions on Power Electronics, vol.18, no.3, pp.793-801, May 2003.
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