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PRESENTATION ON Step up chopperCAREER POINT UNIVERSITY SUBMITTED TO:- SOMESH SIRASS.PRO.OF EE DEPARTMENTSUBMITTED BY:-SHAILESH KUMAR YADAV (K10708)ME ,3rd ,year

INTRODUCTION:- In many technical applications, it is required to convert a set voltage DC source into a variable-voltage DC output. A DC-DC switching converter converts voltage directly from DC to DC and is simply known as a DC Converter. It can be used to step down or step up a DC voltage source, as a transformer . A chopper is basically a dc to dc converter whose main function is to create adjustable dc voltage from fixed dc voltage sources through the use of semiconductors.

PHOTOVOLTIC The power capacity range of a single PV panel is about 100W to 300W, and the maximum power point (MPP) voltage range is from 15V to 40V, which will be the input voltage of the ac module; in cases with lower input voltage, it is difficult for the ac module to reach high efficiency. However, employing a high step-up dcdc converter in the front of the inverter improves power-conversion efficiency and provides a stable dc link to the inverter.

LOAD RESISTANCE Load Resistance =V0/I0Assuming Io to be 0.4A Load Resistance =15V/0.4A = 37.5DUTY CYCLE Duty Cycle = 1-VIN /V0= 0.67CAPACITORC = 2.03410-3FINDUCTORL = 870H

PRINCIPLE OF STEPDOWN CHOPPER:

There are two major factors related to the efficiency of a high step-up dcdc converter: large input current and high output voltage. shows the solar energy through the PV panel and micro inverter to the output terminal when the switches are OFF.[3] When installation of the ac module is taking place, this potential difference could pose hazards to both the worker and the facilities. A floating active switch is designed to isolate the dc current from the PV panel, for when the ac module is off-grid as well as in the non operating condition.

Applications of Choppers:

They are used for DC motor control (battery-supplied vehicles), solar energy conversion and wind energy conversion.Choppers are used in electric cars, airplanes and spaceships, where onboard-regulated DC power supplies are required.In general, Chopper circuits are used as power supplies in computers, commercial electronics, electronic instruments.

Analysis, modeling and simulation of step up converter using MatlabSimulink

The basic configuration of step up converter usually used in photovoltaic solar systems to increase the DC voltage generated at their outputs suffers from some drawbacks just like high ripple in the output voltage, greater losses in the system and unstable dynamic behavior. To eliminate these drawbacks, this paper introduces a two-phase connection of step up converter with uncoupled smoothing reactors.

Applications of Dc-Dc High Step Up Converter DC-DC Converters -

MATLAB SIMULATION RESULTS:

Result:-

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