Sine wave power inverter

[karthickefy]

HI sougata

can you please send me the sourcecode for pic 16f72 based inverter. please find the attachment for 16f72 based inverter circuit.
i'm waiting for your valuable reply.

Thanks and regards,
Karthick
[email protected]

[karthickefy]

HI sougata

can you please send me the sourcecode for pic 16f72 based inverter. please find the attachment for 16f72 based inverter circuit.
i'm waiting for your valuable reply.

Thanks and regards,
Karthick
[email protected]

[pksinha]

Source code is property of jetmark technology,delhi, of above schematic available on commercial terms.
Best regards
pksinha

[babalola]

Hi Das,
What a long time! thanks that the forum is back again, we cannot wait too long to see your inverter design for all.
I think this time around it will afford all of us opportunity to explore every aspect of digital sine wave inverter design.
Thanks for your effort so far,
Regards,
Babalola

[TahmidMahbub]

Regarding sine wave generation and sinusoidal pulse width modulation, I have written quite a few articles and have posted them on my blog. You can find them here:


Generation and Implementation of Sine Wave Table
http://tahmidmc.blogspot.com/2011/01...n-of-sine.html

Smart Sine - Software to generate sine table
http://tahmidmc.blogspot.com/2012/10...rate-sine.html

Generation of sine wave using SPWM in PIC16F684
http://tahmidmc.blogspot.com/2012/10...pwm-in_10.html

600W 50Hz sine wave inverter test circuit
http://tahmidmc.blogspot.com/2012/10...rter-test.html

Feedback in sine wave inverter (PIC16F series based)
http://tahmidmc.blogspot.com/2012/11...er-pic16f.html

Demystifying The Use of Table Pointer in SPWM - Application in Sine Wave Inverter
http://tahmidmc.blogspot.com/2013/02...ointer-in.html

Sine Wave Generation without ECCP - Using single CCP Module of PIC16F877A
http://tahmidmc.blogspot.com/2013/02...t-eccp_16.html

Sine Wave Generation with "Fast PWM Mode" of AVR - using ATmega16
http://tahmidmc.blogspot.com/2013/02...mode_2525.html

I hope everyone finds these articles/tutorials helpful.

Regards,
Tahmid.

[iw2fvo]

Thanks a lot for this post:
this is the most interesting article I have found in this forum.
There are a lot of things to learn.
congratulation to Tahmid.
Regards,
Ambrogio
IW2FVO

[TahmidMahbub]

Thanks a lot for this post:
this is the most interesting article I have found in this forum.
There are a lot of things to learn.
congratulation to Tahmid.
Regards,
Ambrogio
IW2FVO

Thanks.

Tahmid, I've tried to access those files but it seems the file path is unavailable. can you please refresh the link

The links should be fine. They're working fine for me. Please try again.

[wire042]

Tahmid, I've tried to access those files but it seems the file path is unavailable. can you please refresh the link

[wire042]

I have built this inverter but am having some issues with the charging, when I put on the mains my FETs get burnt especially the 2 Low side.
Can some one give me solution to this problem

[babalola]

can you post the aspect of your code that deal with the charging?. here you are talking about syncronouse boost charging when you are using the 2 lower fet to efect the charging. in this case the 6v at the secondary of the same power tansformer is boosted to about 14v to cgarge the battery.note however that at this time of cgarging the upper 2 fets must be switched off then pass you PWModulated signal of a particular duty cycle to drive the lower mosfet. remember equally you are using the leakage inductance of the power transformer for the inductor part of a typical boost converter.
i hope this help,
regards,
babalola.

[sougata]

Hi,
I feel sorry that I am not being able to support this thread as I should and could not complete the conversion of my SMD design to Hobbyist version. (I wish though) Here are some quick tips that may help you babalola:

Synchronous Rectification Deals with Switching on the upper FETs on a per cycle,phase basis so that the rectifier efficiency is best while charging, where the Body Diode is superseded by the RDSon of the MOSFET. For the upper one this may sound simple if you are sensing the input AC and know the Transformer connected as ( Primary Start/Finish vs Secondary Start/Finish, My Pro Design detects it) but for the lower one it gets tricky.

So lets forget Synchronous for now and let the upper MOSFETs behave just like diodes.

Apply PWM to both the Lower MOSFETs simultaneously but only in the middle of a single cycle, with upper limited duty cycle.
To experiment what is the limit with your transformer and profile entire system.
Have a load () connected to the Bridge +DC- and ensure Caps in order of 10000uF
Run a slow loop to increase the PWM (till you fry your MOS )
Idea is to figure out if you are actually achieving any boost

And Tahmid thanks for the great post. I wish I could actually spend sometime giving back to the community for which I am whatever I am today. But I personally would not buy the idea of, a set of different lookup tables for voltage regulation. You can have a 8x8 unsigned multiply within 54uS as stated by Darrel somewhere else and an unrolled Bit tested, rolling multiply takes about 42-44uS to call from PBP. For a proportional control and tricky retention of portion's of older error (I call it pseudo I, cause a software automatically introduces the integration Time) at least a PI system can be designed.

What I have learned from experience is that sometimes it is the Hardware that is crap than my own code (Loads of Crap ) which is to be blamed. Post a schema if possible.

Something to read : http://www.researchgate.net/publicat...fe3d4e9275.pdf

Thanks to all
Regards
Sougata