Abstract
Switch mode dc-dc converters are attractive for their small size, ease of control and efficient power conversion. Output voltage is regulated by duty cycle control of semiconductor switch of switch mode dc-dc converters. The voltage gain and efficiency of practical switching regulators deviate from ideal values at extreme duty cycles. Also, desired gain /attenuation is not achievable at high/low duty cycles. In applications where high gain or high attenuation of voltage is desired with acceptable energy conversion efficiency, hybrid dc-dc switching converters are used. Hybrid dc-dc converters are combination of voltage multiplier/division circuit with appropriate SMPS circuits. By incorporating voltage multiplier/division cell with conventional SEPIC converters, desired voltage gain (either very low or very high) may be achieved at acceptable energy conversion efficiency. In the present work with an aim to attain very high voltage gain by conventional SEPIC topologies, a new voltage multiplier cell consisting of multiple inductors and diodes is proposed.
Highlights
Modern power electronic switches can operate at high frequencies
The SEPIC dc-dc convertor, the hybrid sepic[1]dc-dc converter with two inductors, the hybrid proposed sepic converter with two inductors and the proposed hybridsepic dc-dc converter with three inductors are studied by simulation at variable duty cycles
The total inductors in all the circuits are kept at 1 mH for the purpose of comparison on the same component value.The conventional SEPIC circuit is shown in figure 6 and its typical waveforms are shown in figure 7
Summary
Modern power electronic switches can operate at high frequencies. The high frequency DC-DC chopperconverters are known as switch mode power supplies (SMPS). SMPS are extensively used as power supplies of computers and electronic equipment. According to the type of voltage regulation (step-down/step-up/step-updown) SMPS has three basic (Buck, Boost and BuckBoost/Ĉuk/Sepic) and many derived configurations. The voltage regulation is achieved by duty cycle (D) control of the switching signal of the semiconductor switch of the SMPS. In a practical SMPS, the efficiency and the voltage-gain are function of the duty cycle D. Each type of SMPS has high value of efficiency for limited range of voltage gain (within a range of duty cycle D). In case of extreme gains (either high or low), hybrid SMPS converters may be used to maintain high conversion efficiency. In this Thesis work the SEPIC, the hybrid boost dc-dc converter with two inductors, the hybrid proposed SEPIC converter with two inductors and the proposed hybrid SEPIC dc-dc converter with three inductors are studied by simulation at variable duty cycles
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