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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...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.
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
· 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.
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Such electronic devices often contain several sub-circuits, each with its own voltage level requirement different from that supplied by the battery or an external supply (sometimes higher or lower than the supply voltage). Additionally, the battery voltage declines as its stored power is drained. Switched DC to DC converters offer a method to increase voltage from a partially lowered battery voltage thereby saving space instead of using multiple batteries to accomplish the same
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Power electronics refers to control and conversion of electrical power by power semiconductor devices wherein these devices operate as switches. Advent of silicon-controlled rectifiers, abbreviated as SCRs, led to the development of a new area of application called the power electronics. Prior to the introduction of SCRs, mercury-arc rectifiers were used for controlling electrical power, but such rectifier circuits were part of industrial electronics and the scope for applications of mercury-arc rectifiers was limited. Once the SCRs were available, the application area spread to many fields such as drives, power supplies, aviation
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
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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.
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.