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Boost Converter Lab Report

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CHAPTER 2
BOOST CONVERTER

2.1 GENERAL
A power converter with an output DC voltage greater than its input DC voltage is A step-up converter(boost converter). A class of SMPS(switching-mode power supply) containing semiconductor switches (a diode and a transistor). Filters made of capacitors to reduce output voltage ripple are normally added to the output of the converter . Fig. 2.1 Basic circuit of a boost converter using switch is typically a MOSFET, IGBT.[1]

Power can also come from batteries, solar panels, rectifiers and DC generators. DC to DC conversion is a process that changes one DC voltage to a different DC voltage. A boost converter is called a step-up converter when it “steps up” the source voltage. power (P = VI) must be conserved …show more content…
2.2.b shows the current path during the low period of the switching square wave cycle. As the MOSFET is rapidly turned off the sudden drop in current causes L1 to produce a back emf in the opposite polarity to the voltage across L1 during the on period, to keep current flowing. This results in two voltages, the supply voltage VIN and the back emf (VL) across L1 in series with each other. This higher voltage (VIN +VL), now that there is no current path through the MOSFET, forward biases D1. The resulting current through D1 charges up C1 to VIN +VL minus the small forward voltage drop across D1, and also supplies the load. Boost converter consists of 2 distinct states, it is closed when switch is ON state , with an increase in the inductor …show more content…
This means that overall change in the current is zero: Substituting and by their expressions yields: which can be wrote as: The duty cycle to be: It can be seen that the output voltage is higher than the input voltage, which increases with D, theoretically as D approaches 1 it goes to infinity. That is why this converter is referred to a step up converter.
2.2.3 Discontinuous Mode:
Inductor may be completely discharged before the end of a whole commutation cycle If the ripple amplitude of the current is too high.The current through the inductor drop down to zero during the period. The difference has a strong effect on the output voltage equation. It can be calculated as follows: Fig. 2.4 Operation in Discontinuous mode.[2]
Inductor current at the beginning of the cycle is zero, its maximum value
ILmax (at t = DT) is, During the off-period, IL falls to zero after δT:

The Io is same as to the diode current (ID). The Id is same as to the Il during the off-state. Therefore the output current can be written as: Replacing ILmax and δ by their expressions

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