Sonsivri

I am looking for a project of a dc/ac sinewave inverter with pic, if anybody can help


Thanks

this file is from the cekit magazine...
 
http://kittecnologia.com/download/industrial/down_industrial.php (http://kittecnologia.com/download/industrial/down_industrial.php)
 
 
i'll scan the pages next week for you.
 
 
:o  i hope this code will be useful to you

Thanks a lot picstudent, I´ll test it.

Look also Microchip Application notes for PIC based UPS project.

thanks too. I saw that project but I m looking for somethin using picbasic.
I 'm fighting with some designs with push pull and a 16f73 but couldnt get a good
waveform

U can use MC3PHAC chip from Freescale(free samples!) with PIC as master controller. I now developing drive for high-end vinil turnable with this combination. If any interest arise I'll upload the details.

Yes, please up load it

thank you

OK Just wait a while I clear some shit.

Not cleared yet. Working with real MC3PHAC withouth powerstage. Any questions welcome.

thanks a lot for share your project Kabron

i have a product and software with pic 16F72 , but i cant share it bcause its my buisness product.
pure sinewave 50HZ with pic16f72.

I made a sine wave inverter with PIC16F876A,
Input: 12V DC (10-16V), Output: 220V AC,50Hz, Output power: 500W
Here is the CCS C code and circuit of the sine wave inverter:
http://www.4shared.com/file/216893275/9a3044e6/PIC16_Inverter.html

only sine and modified inverter simulation with proteus. only video  direct download

http://rapidshare.com/files/107494510/matrix.rar

Hi picstudent
Can you upload scanned documents from magazine?

Thanks

Hello
Anyone has the complete list of the parties, because in the Schematic some values are missing.

Thanks

jojora

Hi, sohel, I want to know much will it cost to the investor but output at 60Hz

thanx for sharing Schematic
but there are some values missing and connection of some comparator are also missing can u upload the complete schematic plz

Atmel AVR model ATtiny26 has nice hardware built-in PWM generator for driving bridge's circuits with dead-time generation. I think that it can be good platform for your project.

there are many wayes to build sinewave inverter without microcontroller. some cmos or ttl and eprom, dac

for who want to see circuit with pic16f72.
http://rapidshare.com/files/163986365/scamitic.rar

u need to get topology thats it.

I fully agree with Sohel on this .
Although microcontrollers offer the possibility of pimpy add-ons they are by no means needed .
You can generate that pwm easily with a few opamps or even with some standard pwm generator .
For instance the setup for class d audio pwm generation .
Even the good'oll SG3525 can generate that pwm and is capable of adjusting the dutycycle according to your feedback loop .
Although microcontroller might seem the way '
you should ask yourself the question isn't programming just a longer way to the same goal .
To be honest i wouldnt be suprised when a analog setup outclasses the microcontroller bigtime in speed of feedback etc .
Afterall there wont be any calculations to be done no capture and compare you just feedback your output to your pwm generator (isolated ofcourse ) the reaction is instant (almost)
Maybe it sounds *stoneage* but you should be able to do that with a few opamps and a handfull of discrete components :)

Can anyone explain the working of the above circuit ...plz

Hi sohel,

The hardware schematic you provided is the one many people are using india,I know of many companies here including me who developed software around this hardware....in this I am using Spwm frequency of 6.4Khz.This design also uses BOOST PFC charging by switching lower mosfets @ 15Khz.

please help us with ur firmware and idea.  thanks.

I am extremely sorry as I can not share the code and other details because its a commercial design with some commitments,but still I can give some hints...bythe way ...Sohel as you already own the code then you should be well aware of how this design works????

Hi Friends,
I was redesign the circuit of the Sine-wave Inverter with PIC16F876A MCU
in Altium Designer Summer 08, and You can make your own PCB.
Circuit and C code, here:
http://www.4shared.com/file/216893275/9a3044e6/PIC16_Inverter.html

Best regards
 :)

Circuits for Inverter can be found at

http://www.explorecircuits.com/cir_power_inverter.htm

Hi Friends,
here are the 3 libraries related with electrical circuits of the above design
"Sine-wave Inverter with PIC16F876A MCU" for Altium Designer 08:
http://www.4shared.com/file/90029512/b8a31732/Altium_Library.html

Best regards: Taner
 :)

perhaps this can help

http://www.technology.niagarac.on.ca/people/mcsele/i2k.htm

Hi any body have covertered this program file in hex format? Pls upload it. Thanks.

Hi, In hex format
http://www.4shared.com/file/74830518/15882c5a/sine_pwm_voltage-regulator_32_int.html (http://www.4shared.com/file/74830518/15882c5a/sine_pwm_voltage-regulator_32_int.html)

thanks for sharing the .HEX file but you should also share the circuit diagram for which u had written the code
or share the code   
only the hex file is of no use

Hi every body
Is there any methode to syncronize inverter output with main?
If so please explain.

Hi arash_tah,
yes, there is a two methods for synchronization of the inverter outputs to the main,
first is an simple analog method with analog regulators like TL494, SG3524
and second method is a true digital with digital PLL synchronization. This can be done with
PIC16 or PIC18 MCUs with buil-in PWM modules.
Best regards: Taner
 :)

Hi,
   Without microcontroller you can make a sinewave inverter with operational amplifiers using bubba oscillator. I have attached the circuit.

Hi,
I have downloaded your schematic which shows sine wave inverter with pic 16f72. I have some questions regarding your schematic.
I assume that it is linear type and R-C low pass filter is placed before the transformer to demodulate the carrier frequency of 6.4kHz. Please correct me if I am wrong. If I am correct, please let me know the modalities of low pass R-C filter for demodulation. Hope you will throw some light on the above matter and hope that it will not create any problem regarding the commercial interest of your sine wave inverter.

go here

http://www.sonsivri.com/forum/index.php?topic=3950.0

there is  a new reference design available at microchip site http://www.microchip.com/offlineups

Dear Rajeshkk D\L requires password

Hi Rajeshkk,
 I am having some quarries from you regarding the Inverter.

What is the Modulating Frequency ?
What is the value of the RC Filter for Demodulating Carrier Frequency? Hope to hear from you.

Hi every body
I have a question
How can I generate synchronized spwm with main power?
By the way I use PIC to generate spwm

D/l Website still saying- Password Protected File -
Please enter the password below to download this file
The password you entered was invalid, please try again!

Regards
Unhappy

Build DDS_ TO 2.5 to 20khz  sine wave 4 bit generator
this need low pas filter additional

modify value  fase = fase + xxxx
                                  1 TO  4095  this afect output frecuency
use scope to see output

Check the attached file from
http://www.letbasic.com/forum/showthread.php?s=40ea7bac0314261a85ac1f63eebed5b7&t=1846&page=4

Hi
I was trying to develop a sinewave inverter with 16f73. The waveshape with normal domestic load is just perfect.But it was meant to be used with used with a machine which uses a technology like a dimmer . And whenever this machine is turned on , the wave shape is getting disturbed.
I have included the oscilloscope display of the output . Can anyone please give me some advise about how to correct this problem.

hi sudipm
It depends on the type of inverter I have to see your scematic before guiding

Hi;
At my mind it's a mains noise only, caused by the triac-controlled motor at every moment when it's switched on.
Don't worry the system should be work perfectly so ignore it.

However, use a better filtered power supply for the PIC circuit, proper groundings,
 ... and/or use better shielded scope measuring wires :-) :-).

But  ...this is my mind only ...!!
Have a nice day
zuisti
 

Hi Zuisti
I know it is being caused by the triac switching. But i have to find a way to stop this deformation of the wave.


Hi arash_tah
I am using a full bridge inverter followed by a stepup transformer with split bobbin. The input to the inverter is 12VDc. I will draw a block diagram of the inverter and post here. I think the feedback system i am using is not fast enough to correct the wave shape.
 

hi to all users
          in my opinion there may be two issue regarding to wave disturbance
1) dimmer load may be higher then then unit amp rating and other is control method of pure sine wave invertor wich requierd double calculation all of pic16fx7x desgines based on single calculation which only corrects voltage errors on feedback but not the current error calculation and wave calculation points are less mean small no of wave segments per cycle in lookup table
so for solution  if firmware is enhanced and sine lookup table is doubled in segments  then its current segment count for example if present lookup table is devided in 20 portion to farm a complete wave so double this wave segment to 40 this will reduces the hormonic distortion but for best result add current feedback and calculation for ref of my point regarding to control of pure sine plz see freescale online ups ref disgine and also ti online ups desgine and latest ref desgine on dspic based ups desgine

HI shams Iqbal ,
Can you write little more detail about current feedback system. Cz i also made same kind of Inverter where a common problem is wave shape distortion. Normally i am using 18f452 and CCP1 for PWM and 64 Numbers of  Pwm lookup table For Feedback control.

Now i need the idea for Current lookup table, And the method of applying it with main sine lookup table Please help.

Some of those dimmers are pretty nasty in terms of their power factor. You might be seeing big current spikes at times when you're unable to handle it. Those dimmers can appear to be anything but resistive.

The link is died  :'(

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Dear
            During my research on sine wave inverter i found many application note . U can check there are free scale micro controller ups application note which will give u good explanation also check pic offline ups ref design.  Pic ups ref design project is good explanation for ur understanding but remember current control loop requires high computing power of mcu so if u want to build this control then i will recomend u to use stm32 famly mcu with all sported features of sine wave invertor and very cheep even price is lower then  pic18f452

@pushycat: Thanks for the pointer, but there's nothing in Post #99 that I can see. Can you please provide the actual links or rehost HERE?

thanks

Ah..the post #99 in the said thread in EDA board, is having an attachment and without logging in to the forum you cant see the attachment links. And sorry..... while i was modifying the post with fresh file sharing links, i had a power failure.
Ok..here you go with 100% tested and working direct download links in attachments: Contains All PCB files, schematic, Wiring diagram, Winding details, Hex files, and proteus simulations files. Please note: I am not the designer of the project. Problems, doubts, and discussions about the topic may be continued with other members too.
Enjoy..

@pushycat:

All attachments are corrupted (for me) :'( :'( :'(

Ciao

Sorry..fresh links updated in attachments of my last post. Try again
Cheers..Pushy

Dear all,
WARNING!!! The link posted by Pushycat was from EDABOARD forum ... http://www.edaboard.com/thread150224-8.html    ... many people had already made that design and had complained about this design..as the performance is below average ..so better read first those all pages of that thread and then try something.. that may help save you from after effects like "FRUSTRATIONS"  etc.

M_rahman who claims to be the author of the project, say in one of his posts that the project was published in one of the popular electronics magazine, and is fully working. He has also said anyone is open to test or simulate its functionality as all releated files are given including the proteus simulations.
By the way i have not tried it personally till date but surely intend to have a try as we have all the files. In a situation where despite a lot discussions and requests for a sinewave inverter with PIC were going on, no one had posted a single commercial project till date. But as it is rightly said, "something is better than nothing" we have almost everything what we need to have a fully functional Inverter project, and i heartily appreciate M rahman for bieng so liberal to share the full project.
Cheers