PRESENTED BY

V.SNEHA(10891A0203)

K.SWETHA(10891A0215)

V.SUDARSHAN(10891A0218)

DC-DC BOOST CONVERTER DC-DC BOOST CONVERTER DESIGN FOR SOLAR DESIGN FOR SOLAR ELECTRIC SYSTEMELECTRIC SYSTEM

CONTENTCONTENT

BLOCK DIAGRAMBLOCK DIAGRAM

BASIC BOOST CONVERTER BASIC BOOST CONVERTER

SWITCHING DEVICE AND ICSSWITCHING DEVICE AND ICS

ADVANTAGESADVANTAGES

DISADVATAGESDISADVATAGES

APPLICATIONSAPPLICATIONS

BLOCK DIAGRAMBLOCK DIAGRAM

Photo voltilic

cell

Solar charge controller

Dc loads

inverter

battaryDc-dc boost converter

Ac loads

BOOST CONVERTERBOOST CONVERTER

Output voltage always higher than the input voltage

When the switch is ON:When the switch is ON:

Diode is reversed biasedDiode is reversed biased

output circuit is thus isolated output circuit is thus isolated inductor is charged.inductor is charged.

When the switch is OFF:When the switch is OFF:

The output stage received energy The output stage received energy from the inductor as well as from from the inductor as well as from the input.the input.

Filter capacitor is very large to Filter capacitor is very large to ensure constant output voltageensure constant output voltage

Vd

L D

CS

+ vL

iL

+vo

Vin +

Vout

– C iC

Iout iin

iL

L

+ vL – iD

Vd

D

CS

+ vL -

iL

+vo

-

SWITCHING DEVICESWITCHING DEVICE

In this MOSFET is used In this MOSFET is used as switching deviceas switching device

It is voltage-controled It is voltage-controled device and also it requires device and also it requires small input currentsmall input current

Switching speed is very Switching speed is very highhigh

It operates in nano sec’sIt operates in nano sec’s

ICSICS

Used for pulse genarationUsed for pulse genaration

SG3525SG3525

HEF 7041 HEF 7041

4425 IC4425 IC

High switching frequency High switching frequency up to 400khzup to 400khz

PULSE GENATATIONPULSE GENATATION

ADVANTAGESADVANTAGES

Only one switchOnly one switchHigh effecienceHigh effecienceUnidirectional output currentUnidirectional output currentProvides one polarity output voltageProvides one polarity output voltageLow costLow costEasy to analyzeEasy to analyzeEasy to understandEasy to understandSimple circuitSimple circuit

DISADVANTAGESDISADVANTAGES

Not sutable for high power conversionNot sutable for high power conversion

Low amount of dc step upLow amount of dc step up

Non isolated SMPSNon isolated SMPS

APPLICATIONSAPPLICATIONS

Commanly used as LED driverCommanly used as LED driver

Used for Solar power systemUsed for Solar power system

Used for Power factor correctionsUsed for Power factor corrections

Used in HVDC systemUsed in HVDC system

Applicable for LCDBACKLIGHTS & Applicable for LCDBACKLIGHTS & FLASH LIGHTSFLASH LIGHTS

Used in HVE(Hybrid electric Used in HVE(Hybrid electric vehicles)vehicles)

ANY QUERIESANY QUERIES

THANK YOUTHANK YOU