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It is desired to interface a 500 V DC source to a 400 V, 10 A load using a DC-DC converter. Two approaches are possible, using buck and buck-boost converters.

(a) Derive DC circuit models for buck and buck-boost converters, which model all the conduction losses.

(b) Determine the duty cycle that makes the converters operate with the specified conditions. Use the Secant Method. Verify using LTSPICE simulator.

(c) Compare the efficiencies of the two approaches, and conclude which converter is better suited to the specified application. Give the reasons. Verify using LTSPICE simulator.

Answer :

The given circuit that can be used to obtain a DC voltage from a DC input voltage that is lower than the required output voltage.

(a) The DC model for the boost converter can be represented as:

Buck-Boost Converter is the circuit that can be used to obtain a DC voltage from a DC input voltage that is either higher or lower than the required output voltage.

(b) Determination of duty cycle using Secant Method:

To find the duty cycle for a given DC-DC converter, the following method is used:

Start by guessing a value for the duty cycle then Determine the corresponding steady-state value for the output voltage.

To Compute the corresponding value for the output voltage by performing a simulation.

To Calculate the difference between the calculated value and the steady-state value of the output voltage.

To verify using the LTSPICE simulator, use the parameters: 500 V DC source, 400 V output voltage, and 10 A load.

(c) Comparison of the efficiencies of the two approaches:

The efficiency of the DC-DC converter is defined as the ratio of the output power to the input power. To verify the LTSPICE simulator, calculate the efficiency of each approach using the input and output voltages, and the input and output currents, for each approach. Then, compare the efficiencies of the two approaches.

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