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Analysis and design of a current-fed zero-voltage-switching and zero-current-switching CL-resonant push–pull dc–dc converter
ABSTRACT: A current-fed zero-voltage-switching (ZVS) and zero-current-switching (ZCS) CL-resonant push–pull dc – dc converter is presented in this paper. The proposed push–pull converter topology is suitable for unregulated low-voltage to high-voltage power conversion with low ripple input current. The resonant frequency of both capacitor and inductor is operated at approximately twice the main switching frequency. In this topology, the main switch is operated under ZVS because of the commutation of the transformer magnetising current and the parasitic drain–source capacitance. Because of the leakage inductance of the transformer and the resonant capacitance from the resonant circuit, both the main switch and output rectifier are operated by implementing ZCS. The operation and performance of the proposed converter has been verified on a 400-W prototype.
SOFTWARE: MATLAB/SIMULINK
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CIRCUIT DIAGRAM:
Figure 1 Schematic diagram of the proposed current-fed ZVS–ZCS CL-resonant push–pull dc–dc converter
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0-9347143789/9949240245 EXPECTED SIMULATION RESULTS:
Figure 2 Measured waveforms of gate to source voltage and drain to source voltage a ZVS operations for Q1 and Q2 at the full load b Expanded scale of Fig. 7a in point A
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Figure 3 ZCS operations for Q1 and Q2 at the full load
Figure 4 ZCS operations for rectifier diode at the full load
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Figure 5 Waveforms of vin, iin, ip and icr at the full load
Figure 6 Waveforms with excessive dead time
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Figure 7 Step change with resistance load a Load connection b Load disconnection
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CONCLUSION: This study proposed, analysed, and quantified a current-fed ZVS–ZCS CL-resonant push–pull dc–dc converter that utilises the commutation of the transformer magnetizing current and the parasitic drain–source capacitance to obtain the main switch to be operated under ZVS. By using the leakage inductance of a transformer and resonant capacitor, a sinusoidal current is formed in this resonant circuit by turning on and off the switch. Thus, both the main switch and the output rectifier can be operated under ZCS. Because this proposed converter includes an input inductance, the input terminal of the converter cannot be added with a filter. This converter can reach a steady state with a small ripple input current, which is especially suitable for unregulated dc–dc conversion from a low-voltage high-current source. From the experimental results, the main switch can be operated using both ZVS and ZCS and the output rectifier can be operated using ZCS. The operating principles and theoretical analysis of this proposed converter were verified by using a 400-W and 65-kHz prototype. The overall efficiency of the converter nearly reached 93% at full output power.
REFERENCES: [1] SHOYAMA M., HARADA K.: ‘Steady-state characteristics of the push-pull dc-to-dc converter’, IEEE Trans. Aerosp. Electron. Syst., 1984, 20, (1), pp. 50–56 [2] THOTTUVELIL V.J., WILSON T.G., QWEN H.A.: ‘Analysis and design of a push-pull current-fed converter’. Proc. IEEE PESC, 1981, vol. 5, pp. 192–203 [3] REDL R., SOKAL N.: ‘Push –pull current-fed, multiple output regulated wide input range dc/dc power converter with only one inductor and with 0 to 100% switch duty ratio: operation at duty ratio below 50%’. Proc. IEEE PESC, 1981, pp. 204–212
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0-9347143789/9949240245 [4] WILDON C.P., DE ARAGAO F., BARBI I.: ‘A comparison between two current-fed pushpull dc-dc converters – analysis, design and experimentation’. Proc. IEEE INTELEC, 1996, pp. 313–320 [5] YING J., ZHU Q., LIN H., WU Z.: ‘A zero-voltage-switching (ZVS) push-pull dc/dc converter for UPS’. Proc. IEEE PEDS, 2003, pp. 1495–1499
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