I need a help with DC to AC converter ( pure sine )

[Sun_rise_pt]

I need schematics of a converter DC (12 or 24V) to AC (220V 50 or 60Hz pure sine) and 1kW aprox with IGBT´s or FET's (PWM).
Can anybody help me?

Thak you...

[jeanninemtv]

hummm.... i remember one version with micro, DAC and an 3055 and up transformer ...

yout other way is using pwm and a cap and a opamp to post filter instead of DAC...

[Sun_rise_pt]

Hi jeanninemtv.

Please share with us your infos if possible with schematics...

Thank you.

[Taner]

Hi,
i made a sine-wave inverter project with PIC16F876A,
here is a circuit and CCS PCWH C source file:
http://www.4shared.com/dir/2136086/3afe23e/sharing.html

 

[Sun_rise_pt]

Dear Taner,

Thank you for the msg here.

Please send me the picture of inverter (schematics) because aren't possible the download from http://www.4shared.com/dir/2136086/3afe23e/sharing.html
The C code are ok...

Regards.

[Taner]

OK
 

[mayli]

Does sohel has your design pic16f72 source code?
 

[juk]

Hi Taner,

I need too, Please send me the picture of inverter (schematics)

Thank you

[ipek]

hi  Uninterruptible Power Supply pure sine high eff.....
http://www.nalanda.nitc.ac.in/industry/datasheets/microchip/Mchipweb/1010/Appnote/Category/rDesigns/index.htm#1
good idea

[juk]

Hi ipek

   Thanks...That's good site

[Taner]

Electrical circuit and source code of the inverter, here:
http://mihd.net/qf94no

Best regards,
Taner
 

[juk]

Hello Taner,

Thank you very much.

[zawmintun1]

Hi Sohel
Are you kidding all?
Pls give source for your Schematics of PIC 16x72
as you can
Thank you for your idea
Your Ckt is very good and I interest in it with source code
Peace upon for you

[MAXPAYNE]

Hey Sohel, What's up with uor promise..

[smainj]

500 watts inverter
http://www.electronicsteacher.com/circuits-and-diagrams/power-supplies-and-control-schematics/500Watts_Inverter2.gif
maybe  to help you

[Sun_rise_pt]

 Thank you for the pix sohel.  Manny people are happy if you can send de PIC code...

me too!!!

 

[Ahmad_k]

I think after examining the design that is not a true simewave inverter. If yes, where is the output filter ?

If you using PWM technique then why your transformer is so big

I think it is a modified squarewave.

[Ahmad_k]

Thanks Sohel, and sorry.

One more question please. I see that you calculate your transformer on 50 hz is that right ?? because you did not use a toroide or ferrite transformer.

and why you did not use two IR2110 or similar par to drive mosfet   it will simplify your board size

[Sun_rise_pt]

Thank you Sohel.

The schematics have a "good look"...

Have you the firmware to share with us?

[sam_des]

Hello Everyone,

1) Output Filter must be L-C, not just C to produce SINE Wave. Though it is not directly apperant from sch or photos, there is L. Observe that Transformer is SECTIONAL, i.e. it is wound as S-P-S (S-Secondary, P-Primary).Winding xformer this way produces a very large LEAKAGE INDUCTANCE which acts as L.

2) Xformer seems large for PWM switching, because I guess switching frequency is pretty low around 5-6 kHz. That's what F72 will be able to produce with Software generated 4-Bridge Drives.

3) Is that really 2kV inverter ? Schmeatic shows C19, C20 as 4700u/25V across battery. Battery then must be of only 12V. Am I right ? Nothing wrong in operation, though I wonder how much back-up time this inverter will give at full-load of 2kV !

4) I think there is one mistake in schematic - at Chg Control LM358. Pin no. 4(GND) of this 358(U1) should not be connected to GND of rest of the circuit(i.e. Battery -ve). But it should be rather connected to A point.  Can you verify this, Sohel

Rest of the circuit is quite straight forward. Software for this can be written easily(I guess )

Any one wanting more information about this circuit,can ask questions.

Please note that I don't have the source code, so don't ask it. Neither I've built this in real hardware. But I do have exprience with designing Inverters/UPS so, If anyone willing to write software & test in actual hardware and more importantly share results with everyone here, I can be of help.

reagrds,

sam_des

[sohel]

Hello Everyone,

1) Output Filter must be L-C, not just C to produce SINE Wave. Though it is not directly apperant from sch or photos, there is L. Observe that Transformer is SECTIONAL, i.e. it is wound as S-P-S (S-Secondary, P-Primary).Winding xformer this way produces a very large LEAKAGE INDUCTANCE which acts as L.

2) Xformer seems large for PWM switching, because I guess switching frequency is pretty low around 5-6 kHz. That's what F72 will be able to produce with Software generated 4-Bridge Drives.

3) Is that really 2kV inverter ? Schmeatic shows C19, C20 as 4700u/25V across battery. Battery then must be of only 12V. Am I right ? Nothing wrong in operation, though I wonder how much back-up time this inverter will give at full-load of 2kV !

4) I think there is one mistake in schematic - at Chg Control LM358. Pin no. 4(GND) of this 358(U1) should not be connected to GND of rest of the circuit(i.e. Battery -ve). But it should be rather connected to A point.  Can you verify this, Sohel

Rest of the circuit is quite straight forward. Software for this can be written easily(I guess )

Any one wanting more information about this circuit,can ask questions.

Please note that I don't have the source code, so don't ask it. Neither I've built this in real hardware. But I do have exprience with designing Inverters/UPS so, If anyone willing to write software & test in actual hardware and more importantly share results with everyone here, I can be of help.

reagrds,

sam_des

if u want sine wave without L-C no problem. i have use cap for filter (smooth curve). u have seen online transformer for igbt which show on my site. 

by the way i have deleted all topics from me, because my team 

[Ahmad_k]

Another question to sohel. I see in your schematic that the used output for driving the Mosfet are RC0, RC1, RC4 and RC5. I think that the pwm signal are transmitted by RC0 and RC1. That mean that you use the PWM in software mode and not in hardware mode. Is that right ??

[sohel]

Another question to sohel. I see in your schematic that the used output for driving the Mosfet are RC0, RC1, RC4 and RC5. I think that the pwm signal are transmitted by RC0 and RC1. That mean that you use the PWM in software mode and not in hardware mode. Is that right ??

  u r right.
all pwm work by software.
#define osc_1 PORTC,0
#define osc_2 PORTC,1
#define osc_3 PORTC,4
#define osc_4 PORTC,5
#define BUZZER PORTC,6
#define RELAY PORTC,7
#define SWITCH PORTB,2

look at short video

[Ahmad_k]

Thank You sohel.

I made a simple test yesterday on PWM. I calculate a lookup table using Visual basic (To store it in file automatically) to obtain a 70% amplitude of the sinewave.

when test it with filtering the forme of the signal was very noisy. Then I recalculate the table to obtain 50% and the signal become pure sine. ( I'm using hardware PWM and delay mode)

Any Idea ??

And final question why almost of puresine use the 16F72 or 16C72 ? is there any difference in the PWM interface with 16F72 and 16F873 ?? i'm using 16F873 running on 20Mhz and the PWM signal frequency is 18khz

[sohel]

u Can also use pic16f676. r u know another way make pwm using timer1. some sample with pic16f84. how they did it? f84 have any pwm ?