‭Experiment-8‬
‭Simulation of basic DC-DC converter by using NI Multisim‬
‭Objective of the Experiment:‬
‭ o‬ ‭study‬ ‭DC-DC‬ ‭Converters:‬ ‭Buck,‬ ‭Boost,‬ ‭Asymmetrical‬ ‭Bridge‬ ‭and‬ ‭Full‬ ‭Bridge‬
T
‭Converters.‬ ‭Observing‬ ‭the‬ ‭waveforms‬ ‭in‬ ‭each‬ ‭of‬ ‭the‬ ‭converters‬ ‭through‬ ‭simulation‬ ‭on‬
‭multisim and then deduce some important conclusions from it.‬
‭Theory:‬
‭ C-DC‬ ‭converters‬ ‭are‬ ‭widely‬ ‭used‬ ‭to‬ ‭efficiently‬ ‭produce‬ ‭a‬ ‭regulated‬ ‭voltage‬ ‭from‬ ‭a‬
D
‭source‬‭that‬‭may‬‭or‬‭may‬‭not‬‭be‬‭well‬‭controlled‬‭to‬‭a‬‭load‬‭that‬‭may‬‭or‬‭may‬‭not‬‭be‬‭constant.‬
‭They‬‭are‬‭high-frequency‬‭power‬‭conversion‬‭circuits‬‭that‬‭use‬‭high-frequency‬‭switching‬‭and‬
‭inductors,‬ ‭and‬ ‭capacitors‬ ‭to‬ ‭smooth‬ ‭out‬ ‭switching‬ ‭noise‬ ‭into‬ ‭regulated‬ ‭DC‬ ‭voltages.‬
‭Closed‬ ‭feedback‬ ‭loops‬ ‭maintain‬ ‭constant‬ ‭voltage‬ ‭output‬ ‭even‬ ‭when‬ ‭changing‬ ‭input‬
‭voltages‬ ‭and‬ ‭output‬ ‭currents.‬ ‭At‬ ‭90%‬ ‭efficiency,‬‭they‬‭are‬‭generally‬‭much‬‭more‬‭efficient‬
‭and smaller than linear regulators.‬
‭Buck Converter:‬
‭ uck converter is a step-down dc-dc converter where the output voltage is less than the‬
B
‭input voltage.‬
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‭Boost Converter:‬
‭ oost converter is a step-up dc-dc converter where the output voltage is more than the‬
B
‭input voltage.‬
‭Procedure:‬
1‭ .‬ ‭All the required components are selected and placed in the design area.‬
‭2.‬
‭Appropriate parameters for the components are set up.‬
‭3.‬
‭Circuit connection was made as per the circuit diagram.‬
‭4.‬ ‭Running the Interactive Simulation or Transient Analysis, the load voltage and‬
‭load current are captured.‬
‭5.‬ ‭Changing the circuit connection for different loads, Step 4 was repeated.‬
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‭Simulation:‬
‭DC-DC Buck Converter:‬
‭Circuit Connection:‬
‭Pulse Voltage Source configuration:‬
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‭Transient Analysis Configuration:‬
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‭Waveforms:‬
‭Gate Pulse:‬
‭Dynamic Response of Output Voltage:‬
‭Dynamic Response of Inductor Current:‬
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‭DC-DC Buck Converter:‬
‭Circuit Connection:‬
‭Pulse Voltage Source Configuration:‬
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‭Waveform:‬
‭Gate Pulse:‬
‭Dynamic Response of Output Voltage:‬
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‭Dynamic Response of Inductor Current:‬
‭Asymmetrical Bridge Converter:‬
‭Circuit Connection:‬
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‭Pulse Voltage Source Configuration:‬
‭Waveform:‬
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‭Gate Pulse:‬
‭Dynamic Response of output voltage and Inductor current:‬
‭Full Bridge Converter:‬
‭Circuit Connection:‬
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‭Pulse Voltage Source Configurations:‬
‭Waveform:‬
‭Gate Pulse:‬
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‭Dynamic Response of output voltage and Inductor current:‬
‭Conclusion:‬
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‭1.‬ S
‭ imulations for DC-DC Converters were done successfully. Output waveforms in‬
‭each case were analysed and verified.‬
‭2.‬ ‭In case of Voltage source converter (Inverter), load voltage depends upon the‬
‭source voltage and load current depends upon the load parameter. While, in case of‬
‭current source converter (Inverter), load current depends upon the source current‬
‭and load voltage depends upon the load parameter.‬
‭3.‬ ‭The stepping up or stepping down of voltage of Buck-Boost converter depends‬
‭upon the duty cycle. When D<0.5, it behaves as buck converter and when D>0.5, it‬
‭behaves as boost converter.‬
‭4.‬ ‭In case of Full bridge converter having RLC load, we see over damped response in‬
‭lagging power factor and under damped response in leading power factor.‬
‭Name : Manish Kumar‬
‭Roll: 120EE0476‬
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