PURE SINE WAVE INVERTER CIRUIT DIAGRAM EXPLAINED

THIS POST EXPLAINS YOU ABOUT THE WORKING OF PURE SINE WAVE INVERTER

NOTE : This is 100% working circuit if any one want to try this circuit  I will provide a programmed microcontroller for free.

CLICK ON THE PICTURE FOR BETTER VIEW OF THE CIRCUIT

this circuit explains about the inverting section of 12v to 230v and protections of battery deep discharge and output volts varying according to the load .


the microcontroller was ATMEGA 8 it contains 5 ADC  pins ,these adc pins will be used to scence the battery voltage and feedback section any how we can use remaining to set ac mains changeover voltage ,charging current and overload .but in this circuit only 2 adc slots is explained

The microcontroller will be powered by the battery voltage followed by the 7805 .

The pins 9 and l0 of microcontroller was connected with 16mhz crystal oscillator for microcontroller operation and the pins 7 ,8 ,21,20 and 22 should be connected to respective 5vcc and ground as it is basic and standard connections which are responsible for entire operation of microcontroller .

working of circuit

The battery voltage is fed to the 23rd pin of microcontroller with a voltage divider network ,here the voltage divider is 30k divided by 10k ,so tha is the battery voltage is 12v that passing threw this voltage divider and become 3v and that is fed to the 23rd adc pin of mcu

u1=12v, R1=30k, R2=10k

u2=3v

the microcontroller adc will continuously read the bits of respective analog voltage,if suppose the battery voltage was down to 10.5v then the microcontroller should shutdown the inverter ,so in code the low battery cutoff voltage should me mentioned such that inverter will generate the shutdown pulse to stop the inverter

lets check as per voltage divider formula the if the battery voltage is 10.5 after passing through voltage divider of 30k /10k the voltage will be 2.6v.

so when the voltage at the 23rd pin is 2.6v the mcu will send the shutdown pulses.


now we will see the inverter and mosfet driver section .
The mosfet driving topology is H bridge driving using IR2110 .before going to the explanation I will say how this ir2ll0 will drive the mosfet

 This image is from the datasheet of ir2110

The vdd & vss are logic supply and logic ground

SD is logic shutdown pin (if the SD pin signal is 1 the driver will be shutdown

COM is low side return and VS is high side return

VB  used to supply the float voltage to drive high side of mosfet

HO & LO  are the outputs which drive the mosfet

so an IR2110 ic will drive the half bridge inorder to drive the full bridge we require 2 * ir2110

then their will be 2 high side driving signals and 2 low side driving signals ,all the 4 signals will be drived from microcontroller  with 70% duty cycle and the frequency of 7.4khz .

when the HO high side driving pin of ic3 is 1 then it will drive the mosfet 1 ,at the same time ic3 LO low side driving pin is 0 so it will switches off the mosfet 2.

after 10ms the HO will become 0 and LO becomes 1 at this time mosfet 1 is off and mosfet 2 is on .

similarly to the ic4 ,but when the high side driver is on at ic3 at the same time low side driver will e on at ic4 and when ic3 low side driver is on at same time the high side driver is on at ic4 .

This cycle will repeats with equal intervals and on time and off time delays .

The diode d7 d8 along with capacitors c10 and c11 will form a boost cirutary which charges VB when the HO is low it will charge the VB and when the HO is high the VB will produce an extra voltage in order to drive the high side mosfet .

The resistors R7 R10 R17 R13 are gate current limiting resistors ..

Finally this h bridge will drive the primary side of transformer and it will produce 230v out at the secondary side ...inorder to produce constant output voltage the feedback network is used when ever change in output voltage the duty cycle will be varied which will adjust output voltage .

    

 A FULL PLEDGED DO IT YOUR SELF CARD WILL BE SUPPLIED WITH LOW BAT CUTOFF,OVERLOAD CUTOFF,MAINS CHANGEOVER,MAINS CHARGING AND LED INDICATIONS

INTRESTED CAN CONTACT  splashelectr@gmail.com