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EXPERIMENT NAME : AIM :- Buck-Boost converter using PSPICE To simulate the Buck-boost converter using PSPICE software and obtain the variation of output voltage with duty cycle variation. APPARATUS REQUIRED:1. PC installed with PSPICE Software 2. VDC (voltage source) 3. VPULSE (voltage source) 4. IRF150 (Switch) 5. R (Resistance) 6. L (Inductance) 7. C (Capacitance) 8. DIN4002 (Diode) 9. GND_SIGNAL/CAPSYM THEORY:The buck–boost converter is a type of DC-to-DC converter that has an output voltage magnitude that is either greater than or less than the input voltage magnitude. It is a switched-mode power supply with a similar circuit topology to the boost converter and the buck converter. The output voltage is adjustable based on the duty cycle of the switching transistor. One possible drawback of this converter is that the switch does not have a terminal at ground; this complicates the driving circuitry. Also, the polarity of the output voltage is opposite the input voltage. Neither drawback is of any consequence if the power supply is isolated from the load circuit (if, for example, the supply is a battery) as the supply and diode polarity can simply be reversed. The switch can be on either the ground side or the supply side. Two different topologies are called buck–boost converter. Both of them can produce an output voltage much larger (in absolute magnitude) than the input voltage. Both of them can produce a wide range of output voltage from that maximum output voltage to almost zero. 1 The inverting topology – The output voltage is of the opposite polarity as the input A buck (step-down) converter followed by a boost (step-up) converter – The output voltage is of the same polarity as the input, and can be lower or higher than the input. Such a non-inverting buck-boost converter may use a single inductor that is used as both the buck inductor and the boost inductor. The basic principle of the buck–boost converter is . while switch is in the On-state, the input voltage source is directly connected to the inductor (L). This results in accumulating energy in L. In this stage, the capacitor supplies energy to the output load. while switch is in the Off-state, the inductor is connected to the output load and capacitor, so energy is transferred from L to C and R. Compared to the buck and boost converters, the characteristics of the buck–boost converter are mainly: polarity of the output voltage is opposite to that of the input; The output voltage can vary continuously from 0 to (for an ideal converter). The output voltage ranges for a buck and a boost converter are respectively 0 to and to in continuous mode, ; CIRCUIT DIAGRAM:- 2 Waveforms of current and voltage in a buck–boost converter operating in continuous mode. PSPICE Simulation Diagram : M2 IRF150 D1 2 V2 D1N4002 L1 12Vdc V1 V1 = 0 V2 = 10 TD = 1us TR = 1us TF = 1us PW = .012ms PER = .02ms C1 40uH 50u R1 10 1 0 dutycycle = PW/PER fswitch = 50khz ripple = 0.01 inductance = {(1-dutycycle)*resistance/(2*fswitch)} capacitance = {(1-dutycycle)/(8*inductance*ripple*fswitch*fswitch)} 3 PLOT NO-1 DUTY CYCLE=0.3 PLOT NO-2 DUTY CYCLE=0.5 4 PLOT NO-3 DUTY CYCLE=0.6 CONCLUSION:The output voltage is of the opposite polarity as the input and can be lower or higher than the input voltage depending upon Duty Cycle. 5