This presentation discusses a step up chopper, which is a type of DC-DC converter that can increase voltage from a DC source. It operates by using semiconductors to create adjustable DC voltage from a fixed DC voltage source. A high step-up DC-DC converter is important for photovoltaic systems to improve efficiency by providing a stable high voltage link to the inverter. The presentation includes equations to calculate duty cycle, load resistance, capacitor size, and inductor size for a step-down chopper. It also discusses applications of choppers in electric vehicles, aircraft, and computer power supplies and analyzes a two-phase step-up converter design in MATLAB.

1. PRESENTATION ON
Step up chopper
CAREER POINT UNIVERSITY

2.  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.

3.  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 dc–dc converter in the
front of the inverter improves power-conversion
efficiency and provides a stable dc link to the
inverter.

4.  LOAD RESISTANCE
 Load Resistance =V0/I0
 Assuming Io to be 0.4A
 Load Resistance =15V/0.4A = 37.5Ω

 DUTY CYCLE

 Duty Cycle = 1-VIN /V0
 = 0.67

 CAPACITOR
 C = 2.034×10-3F

 INDUCTOR
 L = 870μH

5. PRINCIPLE OF STEP‐DOWN
CHOPPER:
 There are two major factors related to the
efficiency of a high step-up dc–dc 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

6. 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.

7. Analysis, modeling and simulation of step
up converter using Matlab–Simulink
 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.

9. Converter
DC-DC Converters -

10. MATLAB SIMULATION RESULTS:

11. Result:-