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shikhar-kumar
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BOOST converter
• Widely Used in regulated Switch mode DC power supply
• Variable DC input Voltage is obtained by PV array cells• Four Basic components –Electronic Switch, Inductor,
Diode and output Capacitor• Works on two modes-Continuous mode and
Discontinuous mode which depends upon Energy injection and absorption of the circuit
Circuit Model of Boost converter
Continuous Mode
• Mode 1(0<t ≤ ton)
• Mode 2 (ton<t<t)
cycledutyisDvoltageinputisV
VoltageoutputisVwhereD11
VV
i
o
i
o
currentinputisIcurrentoutputisIwhere
D11
II
i
o
i
o
Discontinuous Mode
• Mode 1 and Mode 2 is same as Continuous Modes
• Mode 3(toff <t<T)
DDD
II
directionnegetiveintimeonturnisDDDD
VV
11
i
o
1
1i
o
Simulation of DC-DC Boost COnverter
• Selection of Semiconductor Device
currentloadtocurrentrippleofpercentis*
pvinpoweroutputimummaxisP
VP*
VP
I
cellPVofvoltageMaximumisV
deviceswitchingonsstressvoltageMaximumisVwhere
VV
max,in
pv
max,in
pv
max,inpeak
max,pv
stressmax,
max,pvstressmax,
• Selection of Inductor
resistanceloadequvalentisRcycledutyisD
frequencyswitchingisFF*2
)D1(D*RL
s
s
2c
• Selection of Capacitance Required
resistanceequivalentisRvoltagerippleisΔV
cycledutyisDfrequencyswitchingtheisF
voltageoutputtheisVR*V*F
D*VC
o
s
o
os
ob
• Selection Of Diode1. Ability to block required off state voltage stress
2.Sufficient peak and average handling capability
3. Fast Switching Characteristics 4.Low reverse recovery current 5.Low Forward Voltage Drop