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- W2159374536 abstract "Abstract —By employing the coupled-inductor technique to the two cascaded boost converters, a single-switch high conversion ratio DC---DC converter is proposed. Unlike its predecessor, high voltage gain can be obtained without operating at extreme duty cycle. In addition to the operating principles and the analysis, a 100 kHz 36-75V DC input, 400V/240W converter is implemented and tested. The 91.2% maximum efficiency can be achieved under high-line 85% full load operation condition. Index Terms —boost, DC-DC, high voltage gain ratio I. I NTRODUCTION High step-up DC-DC converters are necessary in low input-voltage to high output-voltage power conversion applications. By employing the traditional boost converter with extreme duty cycle operation, the voltage gain approximates six times its applied voltage due to the losses of the parasitic components. However, at least ten times voltage gain is needed in many applications such as the front-end stage of the renewable energy systems, the DC bus of the telecom power systems and high intensity discharge (HID) lamp ballast for the automobile headlights. To obtain the required voltage gain, several topologies have been proposed by employing the coupled inductor or the cascaded booster converter techniques [1]-[12]. However, the former technique induces high voltage stress caused by the leakage inductance of the coupled inductor. On the contrary, the latter suffers from the synchronizing of the two power switches [9]. By merging both the coupled inductor and the cascaded techniques, a novel single-switch high conversion ratio DC---DC converter is thus proposed to alleviate these problems. In addition to the analysis and circuit principles, the circuit is implemented and tested to demonstrate its feasibility. II. ANALYSIS AND CIRCUIT OPERATION The circuit diagram and the key waveforms of the proposed converter are shown in Fig. 1 and Fig. 2, respectively. It consists a coupled-inductor with two windings, L1 and L2, with N ()N2:N1 turns-ratio, one switch S1, three diodes D1, D2, D3, one inductor L3, and two output capacitors, C1 and C2. To simplify the analysis of the proposed converter, the capacitors, C1 and C2, are assumed to be sufficiently large that the voltages can be assumed to be constant. Figures 3(a) and 3(b) illustrate the equivalent circuits during the switch-on and the switch-off period, respectively. The operation of the converter can be divided into two stages within one full switching cycle:" @default.
- W2159374536 created "2016-06-24" @default.
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- W2159374536 date "2009-01-01" @default.
- W2159374536 modified "2023-09-27" @default.
- W2159374536 title "A Novel Single-Switch High Conversion Ratio DC--" @default.
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