Microcontroller based Microcontroller based solar inverter & charge solar inverter & charge

controllercontroller

FLOWFLOW OF PRESENTATION OF PRESENTATIONIntroductionLiterature SurveyDesign ManufacturingExperimentationSimulationResult ApplicationConclusion

IntroductionIntroduction

We have designed a small microcontroller based solar inverter & battery charger.

We are taking input from solar panel & going to stored as DC in battery bank. Using this DC voltage as input inverter to get AC at output of inverter. It includes push pull Converter, HF transformer, Rectifier, LC Filter and Full bridge.

we have designed simple, small, feasible inverter of 200VA.

Literature SurveyLiterature Survey

1)Types of solar inverters:-I. Stand-alone inverters

II. Grid tie inverters

III. Battery backup inverters

IV. Solar micro-inverters

2)Types of inverters:-I. Square wave inverter

II. Modified sine wave inverter

III. True sine wave inverter

Literature SurveyLiterature SurveyCharge controller:- A Charge controller is an

electronic DC to DC converter .they convert a higher voltage DC output from solar panels down to the lower voltage needed to charge batteries.

Types of Charger:-1)Constant voltage charger

2)Shunt Charger

3)Series Charger

4)Buck Charger

Design :-Design :-

PICAXE Controller:- Produces two complementary pulses to

control half-bridge MOSFETs. Also it is used to drive full bridge.

Voltage is not sufficient to drive theMOSFETs.A ULN2003 to boost voltage up to 8volt, to drive

MOSFETs. It can supply up to 50volt voltage.PICAXE is also Programmed for Battery charge

controller to drive MOSFET switch.

Push-Pull ConverterPush-Pull Converter It is a DC-DC

converter.Advantages of it are,

it’s simplicity and it can be used for high power applications.

We are using IRF250A as switches in this topology and ferrite core transformer

Bridge RectifierBridge RectifierTo convert high

frequency square wave into DC voltage we have used bridge rectifier.

Since it is high frequency and high voltage AC, we have to use rectifier diodes accordingly.

We are using diodes 6A4.

Low-pass FilterLow-pass Filter

L-C filter◦ Filters 70Khz, 240volts

voltage into pure dc◦ Only two components◦ Current capacity

depends on gauze rating of wire of inductor

◦ Wind inductor (fine tune)

◦ F=1\1.41*L*C

Full-bridge InverterFull-bridge Inverter

Converts 240 VDC ,into 250VAC, 50 Hz, Modified sine wave

IRF830 MOSFETs◦ Vdss = 500 V◦ Id =4. 5A ◦ Rds(on) = 1.5 Ω

Software design:-Software design:-In software design:-

As we are using PICAXE hence

software deign only includesBasic programming of PICAXE

controller.We have simulated design for square

wave generation successfully.

ManufacturingManufacturing

Step Up Transformer:-Steps up voltage from 24VAC to 240 VACOperating frequency :-

35Khz.Output current :-1AmpType:-Ferrite coreShape:-E-E typePrimary current :-10Amp

Experimentation:-Experimentation:-

Modified Sine wave Output Modified Sine wave Output From SimulationFrom Simulation

Gate Drive Waveform:-Gate Drive Waveform:-

Device as BuiltWe have

generated Square wave of

35Khz,5 volt Using PICAXE-18M2

MicrocontrollerSame waveform

for used one for 1st MOSFET, inverted is applied 2nd MOSFET

in push pull converter.

Final output:-Final output:-

APPLICATIONS:-APPLICATIONS:-

1.Rural electrification.

2.Industrial power backup and energy management.

3.Interface alternative energy sources with home appliances.

4.Telecommunications: Remote power management using GSM/GPRS (extensive trending and event logging).

Thank youThank you