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Theory:: Experiment 4 Boost Converter

The document summarizes an experiment on a boost converter. The objective is to study the closed loop response of a boost converter under load regulation. The experiment uses a boost converter circuit with an NMOS transistor, Schottky diode, inductor, capacitor and resistor load. It measures the input voltage, on-time, off-time, duty cycle, output voltage and calculated output voltage at different load resistances to examine the open loop response under load regulation. Precautions are provided to ensure safety when conducting the experiment.

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RAVI DUTT
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756 views2 pages

Theory:: Experiment 4 Boost Converter

The document summarizes an experiment on a boost converter. The objective is to study the closed loop response of a boost converter under load regulation. The experiment uses a boost converter circuit with an NMOS transistor, Schottky diode, inductor, capacitor and resistor load. It measures the input voltage, on-time, off-time, duty cycle, output voltage and calculated output voltage at different load resistances to examine the open loop response under load regulation. Precautions are provided to ensure safety when conducting the experiment.

Uploaded by

RAVI DUTT
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Experiment 4

Boost Converter
Objective
To study the closed loop response of a boost converter load regulation
Software/ Hardware Required: Multisim 12.0, DC Power supply(0-30V),
L=250uH,NMOS:2N7000,Schottky Diode 1B0Q015,C=1000uF,R=1kohm,CRO, Function
generator.

Theory:
Boost Converter
A boost converter (step-up converter) is a DC to DC that steps up voltage (while stepping
down current) from its input (supply) to its output (load). It is a class of switched-mode
power supply(SMPS) containing at least two semiconductors (a diode and a transistor) and
at least one energy storage element: a capacitor, inductor, or the two in combination. To
reduce voltage ripple, filters made of capacitors (sometimes in combination with inductors)
are normally added to such a converter's output (load-side filter) and input (supply-side
filter)
Circuit Diagram:
Circuit diagram of boost converter is shown in Figure

Figure 1 Boost DC-DC converter


Working Principle:
The function of boost converter can be divided into two modes, Mode 1 and Mode 2. Mode 1
begins when transistor M1 is switched on at time t=0. The input current rises and flows
through inductor L and transistor M1.
Mode 2 begins when transistor M1 is switched off at time t=t1. The input current now flows
through L, C, load, and diode Dm. The inductor current falls until the next cycle. The energy
stored in inductor L flows through the load.

Observation Table:
Measure and tabulate the following readings.
SET Input voltage = 30V
Set pulse voltage: 10V (Buck operation )
Load Regulation:
S.no Input TON TOFF D= Load Output Output
Voltage TON/T Resistor Voltage calculated
Vin (R Ω) Measured(Vo) Vo=
I*R(volts)
1

Model Calculation:
T = TON +TOFF
= …….𝜇s +…… 𝜇s = ……. 𝜇s
D = TON / T
= …………..

Vo (calculated)= I*R(volts)

Expected Waveforms For Load Regulation

Results: The open loop response for boost converter for load regulation has been examined.
Output voltage is boosted to………V DC voltage.

Precautions:1. Use only isolated power sources (either isolated power supplies or AC power
through isolation power transformers). This helps using a grounded oscilloscope and reduces the
possibility of risk of completing a circuit through your body or destroying the test equipment.
2. Check for all the connections of the circuit and scope connections before powering the circuit, to
avoid shorting or any ground looping that may lead to electrical shocks or damage of equipment.
3. Double-check your wiring and circuit connections. It is a good idea to use a point-to-point wiring
diagram to review when making these checks.
4.After switching off Let the load be connected at the output for some time, so that it helps to
discharge capacitor or inductor if any, completely.

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