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COMPARISON OF BUCK, BOOST, AND BUCK-BOOST CONVERTERS

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- 1. ADVANCE POWER ELCTRONICS Power Converters Report COMSATS INSTITUTE OF INFORMATION & TECHNOLOGY, ABBOTABAD PREPARED BY: ZUNAIB ALI FA13-R09-013 DEPTT: ELECTRICAL ENGINEERING (POWER)
- 2. Power Converters Note: All simulation results are taken by using mosfet at frequency of Buck BOOST CONVERTER Table 1: Conduction Mode & Efficiency For Different values of duty cycle of Buck-Boost Converter For Constant Duty Cycle, Inductance Value Condition Mode Efficiency, DCM 50.71% BCM 57.02% CCM 57.53% Continuouspowergui v+ - V2v+ - V1Scope2Scope1R1PulseGenerator1gmDSMosfetInMeanMean Value3L1i+ - IL2i+ - IL1i+ - IL[H] Goto[H] FromDisplay1Diode1DC Voltage Source1C1
- 3. Inductor Current vs. Gate Signal Figures for Buck-Boost Converter Figure 1: For D=50%, DCM (BUCK BOOST) Figure 2: For D=50%, BCM ( BUCK BOOST)
- 4. Figure 3: For D=50%, L=130μH CCM (BUCK BOOST) Table 2: Conduction Mode & Efficiency For Different values of duty cycle of Buck-Boost Converter For Constant Inductance, Inductance Value Condition Mode Efficiency, DCM 49.47% BCM 51.99% CCM 52.33% Conclusion: By increasing the value of inductor the peal to peak value of ripple decreased. Efficiency of converter is maximum in continuous conduction mode. Conduction modes can be varied by keeping inductance constant and changing duty cycle, there by ripple value remains the same. Hence filter is designed for specific value.
- 5. Buck CONVERTER Table 3: Conduction Mode & Efficiency For Different values of Inductance of Buck Converter For Constant Duty Cycle, Inductance Value Condition Mode Efficiency, DCM 62.27% BCM 64.78% CCM 66.56% Continuouspowerguiv+ - VScope3RPulseGeneratorgmDSMosfet1InMeanMean Value3InMeanMean Value2InMeanMean Value1Li+ - I_L2i+ - I_L1i+ - I_L[E] Goto1Divide2Divide1Divide0.6656DisplayDiodeDC Voltage Source10ConstantC
- 6. Inductor Current vs. Gate Signal Figures for Buck Converter Figure 4: For D=50%, BCM (BUCK) Figure 5: For D=50%, L=90μH DCM (BUCK)
- 7. Figure 6: For D=50%, L=110μH CCM (BUCK) Table 4: Conduction Mode & Efficiency For Different values of duty cycle of Buck Converter For Constant Inductance, Inductance Value Condition Mode Efficiency, DCM 63.29% BCM 64.78% CCM 65.45% Conclusion: By increasing the value of inductor the peal to peak value of ripple decreased. Efficiency of converter is maximum in continuous conduction mode. Conduction modes can be varied by keeping inductance constant and changing duty cycle, there by ripple value remains the same. Hence filter is designed for specific value.
- 8. Boost CONVERTER Table 5: Conduction Mode & Efficiency For Different values of Inductance of Boost Converter For Constant Duty Cycle, Inductance Value Condition Mode Efficiency, DCM 74.91% BCM 76.47% CCM 79.28% Continuouspowerguiv+ - V2Scope1R2PulseGenerator2InMeanMean Value3InMeanMean Value2InMeanMean Value1L2 gm12 Ideal Switch2i+ - I_L1[A] Goto2Divide2Divide1Divide0.5182DisplayDiode2DC Voltage Source2i+ - Current Measurement10ConstantC2
- 9. Inductor Current vs. Gate Signal Figures for Buck Converter Figure 7: For D=50%, L=338μH DCM (BOOST) Figure 8: For D=50%, L=340μH BCM (BOOST)
- 10. Figure 9: For D=50%, L=380μH DCM (BOOST) Table 6: Conduction Mode & Efficiency For Different values of duty cycle of Boost Converter For Constant Inductance, Inductance Value Condition Mode Efficiency, DCM 73.11% BCM 75.21% CCM 76.96% Conclusion: By increasing the value of inductor the peal to peak value of ripple decreased. Efficiency of converter is maximum in continuous conduction mode. Conduction modes can be varied by keeping inductance constant and changing duty cycle, there by ripple value remains the same. Hence filter is designed for specific value.

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