HOW-TO GUIDE
Introduction of Step Up and
Step Down Chopper
Introduction
A chopper is a high speed on/off semiconductor
switch. It connects source to load and disconnects the load
from source at a fast speed.
Step Up or Boost converter.
Step Down or Buck Converter.
Step Up or Boost converter
In this converter Output Voltage is greater than input
voltage. This is achieved by fast switching of a semiconductor
device. The increase in output voltage depends on the
frequency of switching (i.e.) depends on pulse given to the
device. While switch is off the output voltage almost same as
input. While switch is ON mosfet is assumed as short hence
current flow in a shortest path so inductor gets energized, and
in continues flow we get output voltage greater than input.
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Step Down or Buck converter
In this converter Output Voltage is less than input
voltage. This is achieved by switching of a semiconductor
device. The decrease in output voltage depends on the switch
off and on time. While device is off state it means there will not
be any contact between load and input so the output voltage
will be zero. While device is On state there will the output
voltage hence the loop continues.
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