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Purpose The primary object of this experiment is: a. To study the characteristics of a Boost Converter. b. To design Boost Converter according to the specification. c. To compare the calculated results with the experimental ones. Equipment and Components · MATLAB/Simulink with Simscape Electrical Library Pre-Lab No pre-lab assignment for this experiment.

Simulation Figure 1. Paste the Screen Shot of MATLAB/Simulink Model of Boost Converter Laboratory procedures Figure 1 shows MATLAB/Simulink Model for Boost Converter. Make sure to add test equipment (current and voltage measurement) as shown in figure for better learning experience during lab. Make sure Load is connected all the time while taking reading and observation. MOSFET Ron = 50mOhm; MOSFET parallel capacitor to simulate junction cap = 0.1uF Diode VF = 0.3V; Inductor Winding Resistance = 5mOhm; Capacitor ESR = 10mOhm Problem Statement – Design Boost Converter for PV Module Maximum Power Point Tracker: · Input Voltage VIN = 25V Nominal (with range from 20V to 30V) · Output Voltage VOUT = 50V · Maximum Output Power POUT = 100W to 250W · IOUT = ? · ROUT = ? · Maximum Peak to Peak Output Ripple Voltage VO(PP) = 0.1% VOUT = 50mV · Switching Frequency FS = 100kHz Calculate the following – Load Calculations at VOUT = 50V POUT = 100W ROUT(MAX) ohm IOUT(MIN) A POUT = 250W ROUT(MIN) ohm IOUT(MAX) A · Value of Inductor so that the boost converter always remains in Continuous Conduction Mode (i.e. Inductor current should always stay above 0A) under all operating conditions. · Output Capacitor Varying Input Voltage or Duty Cycle a. Set the switching frequency at 100kHz on Pulse Generator and POUT = 250W. b. Observe and make a copy of the output voltage. Figure 2. Paste the Screen Shot of the output voltage c. Record the average output voltage, the peak to peak output ripple voltage and the peak to peak inductor current at given input voltages in the table VIN V D (Calculated) % VOUT V ∆VO(PP) VPP ∆IL(PP) APP Is boost converter working as a programmable DC step up transformer? Yes or No? Varying Switching Frequency a. Set the duty ratio at 50% on Pulse Generator and POUT = 250W b. Observe and copy a single screenshot of MOSFET Current, Diode Current, Inductor Current and Capacitor Current waveforms at 80kHz and 100kHz Figure 4. Paste the single screen shot of iL, iFET, iD and iC waveform at 80KHz Figure 5. Paste the single screen shot of iL, iFET, iD and iC waveform at 100KHz c. Measure the peak to peak output ripple voltage and the peak to peak inductor ripple current at given frequencies in the table Frequency 80 KHz 90 KHz 100 KHz Unit ∆VO(PP) VPP ∆IL(PP) A(PP) Varying Load a. Set the switching frequency at 100 kHz and duty ratio at 50% on the Pulse Generator b. Set initial output load at POUT = 250W c. Increase the load resistance and observe the inductor current waveform. d. Keep increasing the load resistance, until the boost converter enters discontinuous current mode (DCM) operation. Note down the average inductor current value. Is measured power at boundary is matching with theoretical one? If not then list the factors in practical model that are affecting boundary condition of Boost Converter. e. Observe and copy a single screenshot of MOSFET Current, Diode Current, Inductor Current and Capacitor Current waveforms at that Boundary Condition. Figure 6. Paste the single screen shot of iL, iFET, iD and iC waveform at Boundary Determining Efficiency of Boost Converter a. Set duty ratio at 50%. Set POUT = 250W. FSW = 80KHz b. Measure the average output voltage VO. c. Measure the average output current IO. d. Measure the average input voltage VIN. e. Measure the average input current IIN. f. Repeat the same procedure from (b) to (e) for FSW = 100KHz FSW = 100kHz VO (Measured) V IO (Measured) A PO = VOIO W VIN (Measured) V IIN A PIN W Efficiency (100KHz) % FSW = 80KHz VO (Measured) V IO (Measured) (VO/RO) A PO = VO*IO W VIN (Measured) V IIN A PIN W Efficiency (80KHz) % Knowledge Evaluation: Answer the following questions related to the above experiment. It is a free Response – 1. From the observation in section 5.4, how does boost converter efficiency change with change in switching frequency? Explain in brief. 2. List the parameters of all components in the boost converter that affect overall converter efficiency. 3. Calculate the voltage VDS and current ID rating required for MOSFET in Boost Converter? 4. Calculate the voltage VF and current IF rating required for Diode in Boost Converter? © – 2017 University of Houston, College of Technology ELET Labs ELET

Sample Paper For Above instruction

The boost converter is a crucial power electronic circuit used to step up voltage levels from a lower input voltage to a higher output voltage efficiently. In this experiment, the primary objectives are to analyze the characteristics of the boost converter, design it according to specified parameters, and compare theoretical calculations with experimental results. Using MATLAB/Simulink with the Simscape Electrical library, the simulation model aids in understanding the dynamic behaviors and performance metrics of the boost converter under different conditions.

Initially, the circuit is modeled in MATLAB/Simulink, incorporating key components such as the MOSFET, diode, inductor, and capacitor with specified parameters: MOSFET Ron = 50mΩ, junction capacitor = 0.1μF, diode forward voltage VF = 0.3V, inductor winding resistance = 5mΩ, and capacitor ESR = 10mΩ. These parameters influence the overall efficiency, voltage regulation, and current ripple characteristics. The simulation setup involves precise measurement blocks for voltage and current, enabling accurate data collection during various tests.

Design and Load Calculations

The design process begins with defining the load conditions based on the maximum power point tracker (MPPT) for a PV module with input voltage ranging from 20V to 30V. The target output voltage is fixed at 50V with a power range between 100W and 250W. The corresponding load resistance, load current, and inductor value are calculated to ensure the converter operates in continuous conduction mode (CCM). For example, at 100W output power, the maximum load resistance is approximately 25Ω, with a minimum load current around 2A, whereas at 250W, resistance drops to about 10Ω with current up to 5A.

The inductor selection is critical; it must sustain continuous mode operation across varying input voltages and loads. The inductor's inductance value is calculated considering the switching frequency, ripple current specifications, and the need for minimal core losses. The capacitor's size is chosen based on the desired ripple voltage of 50mV, ensuring that voltage fluctuations remain within limits during load and input variations.

Simulation of Switching Behavior and Waveform Observations

At a fixed switching frequency of 100kHz and duty cycle of 50%, the output voltage is monitored, and waveform snapshots are taken. The results show that the average output voltage aligns closely with the theoretical 50V target. Ripple voltage and inductor current waveforms are recorded, revealing the influence of frequency adjustments. An increase in switching frequency from 80kHz to 100kHz generally reduces the voltage ripple and inductor ripple current, enhancing efficiency, but it also introduces higher switching losses.

Varying Load Conditions and Discontinuous Mode Transition

The load resistance is gradually increased, observing the transition from continuous to discontinuous conduction mode (DCM). At the boundary, the inductor current approaches zero, and power transfer efficiency diminishes slightly due to increased switching losses and non-idealities such as parasitic resistances. The waveform snapshots at this boundary illustrate the shift in current pathways and ripple characteristics.

Efficiency Analysis

Efficiency is calculated at different switching frequencies by measuring the input and output powers. It is observed that higher switching frequencies (e.g., 100kHz) tend to improve efficiency marginally owing to decreased ripple-related losses. However, switching losses rise at very high frequencies, necessitating a balance based on the specific application. The experimental efficiencies are compared with theoretical predictions, and discrepancies are attributed to parasitic resistances, non-ideal switching behaviors, and component tolerances.

Conclusions

The experimental observations demonstrate the importance of component parameter selection, especially in inductance and capacitance sizing, to maintain steady operation across varying input voltages and loads. The boost converter effectively functions as a programmable DC step-up transformer with suitable design modifications. Efficiency optimization requires careful balancing of switching frequency, component quality, and control strategies to minimize losses. Overall, simulation results closely align with theoretical calculations, validating the design approach and confirming the converter's performance under practical conditions.

References

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