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Author Topic: I need a help with DC to AC converter ( pure sine )  (Read 22045 times)
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Sun_rise_pt
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« on: June 14, 2007, 08:09:58 20:09 »

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...
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jeanninemtv
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« Reply #1 on: June 14, 2007, 11:49:27 23:49 »

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...








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Sun_rise_pt
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« Reply #2 on: June 15, 2007, 06:43:28 18:43 »

Hi jeanninemtv.

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

Thank you.
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Taner
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« Reply #3 on: June 18, 2007, 03:46:00 15:46 »

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

 Smiley
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Sun_rise_pt
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« Reply #4 on: June 19, 2007, 08:22:47 20:22 »

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.
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Taner
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« Reply #5 on: June 20, 2007, 12:15:08 00:15 »

OK
 Smiley
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mayli
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« Reply #6 on: July 03, 2007, 09:09:48 09:09 »

Does sohel has your design pic16f72 source code?
 Cheesy
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juk
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« Reply #7 on: July 06, 2007, 11:32:53 11:32 »

Hi Taner,

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

Thank you
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ipek
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« Reply #8 on: July 06, 2007, 10:56:42 22:56 »

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
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juk
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« Reply #9 on: July 07, 2007, 02:18:13 02:18 »

Hi ipek

   Thanks...That's good site
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Taner
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« Reply #10 on: July 07, 2007, 07:34:13 19:34 »

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

Best regards,
Taner
 Smiley
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juk
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« Reply #11 on: July 08, 2007, 12:24:12 00:24 »

Hello Taner,

Thank you very much.
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zawmintun1
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« Reply #12 on: August 02, 2007, 11:39:08 11:39 »

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
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MAXPAYNE
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It's a little funny......


« Reply #13 on: August 07, 2007, 08:28:54 08:28 »

Hey Sohel, What's up with uor promise.. Huh Huh Huh
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smainj
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« Reply #14 on: August 07, 2007, 04:22:59 16:22 »

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

« Last Edit: August 10, 2007, 01:05:52 13:05 by smainj » Logged

Sun_rise_pt
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« Reply #15 on: August 10, 2007, 08:43:18 20:43 »

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

me too!!!

 Wink
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« Reply #16 on: August 12, 2007, 09:32:51 21:32 »

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

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

I think it is a modified squarewave.
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Ahmad_k
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« Reply #17 on: August 13, 2007, 05:39:43 17:39 »

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 Huh  it will simplify your board size
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Sun_rise_pt
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« Reply #18 on: August 13, 2007, 07:23:15 19:23 »

Thank you Sohel.

The schematics have a "good look"...

Have you the firmware to share with us?
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sam_des
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« Reply #19 on: August 13, 2007, 09:00:04 21:00 »

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 Tongue

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

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
« Last Edit: August 13, 2007, 09:04:57 21:04 by sam_des » Logged

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sohel
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« Reply #20 on: August 13, 2007, 10:35:27 22:35 »

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 Tongue

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

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.  Roll Eyes

by the way i have deleted all topics from me, because my team  Shocked
« Last Edit: August 13, 2007, 10:38:24 22:38 by sohel » Logged

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Ahmad_k
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« Reply #21 on: August 14, 2007, 10:14:57 22:14 »

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 ??
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sohel
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« Reply #22 on: August 14, 2007, 10:51:29 22:51 »

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 ??

 Grin 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
« Last Edit: August 14, 2007, 11:30:39 23:30 by sohel » Logged

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Ahmad_k
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« Reply #23 on: August 15, 2007, 09:50:41 09:50 »

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
« Last Edit: August 15, 2007, 09:59:42 09:59 by Ahmad_k » Logged
sohel
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« Reply #24 on: August 15, 2007, 12:06:21 12:06 »

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 ? Huh Huh Huh
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