This paper introduces the use of the voltage multiplier technique and passive absorption circuit applied to the non-isolated dc-dc converter in order to obtain high efficiency and high voltage gain. A passive absorption circuit is inserted in the interleaved flyback converter to transfer the leakage energy to load. The operation principle of the circuit is explained. This paper also deals with MPPT controlled high step up dc-dc converter. The switching element used in the flyback converter is MOSFETs, which is completely on and completely off. This is because MOSFET has high power rating and high switching speed. Moreover, high voltage conversion ratio is achieved. The simulated results are presented with R load.
Keywords: Interleaved flyback converter, passive absorption circuit, high voltage gain
1 INTRODUCTION
A DC-DC converter is a device that accepts a DC input voltage and produces a DC output voltage. In many industrial applications, it is required to convert a fixed voltage dc source into variable voltage dc source. Typically the output produced is at a different voltage level than the input.
In any type of DC-DC converter circuit, the selection of power device for a particular application not only the required voltage and current levels but also its switching characteristic. The key parameters to look for in the MOSFET are the switching time and current rating. These two parameters greatly affect the maximum switching frequency of the converter. Because switching speed and associated power losses are very important in the power electronics circuits. For example, the BJT is minority carrier device, whereas the MOSFET is a majority carrier device ...
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...4206, Sep. 2011.
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...hborhood, additive CA are ideally suited for V LSI implementation. Different applications ranging from V LSI test domains to the design of a hardwired version of different CA based schemes have been proposed.
The aim of the project is to increase the power of bike by employing an electric supercharger.
· B-phase transformer (EMTU-TT01) · Feedback electronic wattmeter · Multi-range moving-iron ammeter · Instrument voltage transformer THEORY AND INTRODUCTION ----------------------- Transformers are used all over the world to step-up and step-down electricity. The transformer is one of the most commonly used electrical devices. The reason the transformer is so popular is because they range in size from 240V to well over 240kV, stepping -up and stepping-down electricity all over the world.
In this thesis, MATLAB/SIMULINK (version 11) software has been used to design and develop the control circuit for dc to ac conversion and analyze simulation in MATLAB environment along with Simulink and power system block set (PSB) toolboxes. The name MATLAB symbolizes for MATrix LABoratory. MATLAB was written initially to give easy access to matrix software developed by the LINPACK (linear system package) and EISPACK (Eigen system package) projects.
In the case of high step-down and high frequency applications the conventional interleaved buck converter suffers from the disadvantage of low on-time. Thus, the IBC operates with lower efficiency when operated at higher switching frequency. The voltage conversion ratio of the conventional IBC and buck converter is equal to the duty ratio D whereas the
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Basic Mathematics for Electronics seventh edition: Nelson M. Cooke, Herbert F.R Adams, Peter B. Dell, T. Adair Moore; Copyright 1960
Recent years have shown an increasingly large need for a practical renewable energy source for such reasons as diminishing fossil fuels and increases in greenhouse gasses. Hydrogen appears to be a way out of this gasoline-dug hole, or at least, a way out in the future. Hydrogen fuel cell cars are being engineered as we speak as the technologies to refuel them cleanly are being proposed. Unfortunately, most of the technologies associated with hydrogen are still in the prototype/pre-production stages and require better enhancements before becoming mainstream. This paper assesses the practicality of hydrogen power in cars both now and in the future while explicating the actual process of how a hydrogen fuel cell works.
Nice, K. a. (2000, September 18). "How Fuel Cells Work". Retrieved March 30, 2014, from HowStuffWorks.com: http://auto.howstuffworks.com/fuel-efficiency/alternative-fuels/fuel-cell.htm
A power inverter, or inverter, is an electronic device or circuitry that changes direct current (DC) to alternating current (AC).[1]
Advent of devices with better switching capabilities has enriched the field of power electronics. This enables the development of converter circuits with improved and high performance[6]. The AC-DC
High performance MPPT includes pulse width modulation (PWM) used in large scale PV module, whereas low performance MPPT includes pulse frequency modulation (PFM) used in small scale PV module. PFM is used instead of PWM to attain better efficiency at low power levels. PWM continuously activate the switches of the converter at a fixed frequency whereas PFM adjusts the switching activity of the available power. Higher ripple current can be produced for the frequency modulation which reduces the efficiency. To reduce this problem current limiter is used for higher switching frequency.
The CSC converter is similar to the Cuk converter. The CSC converter includes a switch, diode and a capacitor. It is used for the design of various DC -DC converters [4-5]. Fig. 2. shows a CSC converter.
Factors that are crucial for the efficiency of power bank are the environment, cell type and the quality of component.