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  1. #661
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    Re: Pic 16f876a Pure Sinewave inverter

    Yes, it's tested and worked. But I have small problem with V out /see #653/. Also you can replace current sensing circuit with these:


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  2. #662
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    Re: Pic 16f876a Pure Sinewave inverter

    I have to study your modification and then I have to test it with hardware. It looks logical to me, I also thought about using signal O/E to control of work of the inverter (UPS). Did you test "Opto current sensing" in real?

    Regards


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  3. #663
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    Re: Pic 16f876a Pure Sinewave inverter

    Yes, all shematic, witch I upload, tested and worked.


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  4. #664
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    Re: Pic 16f876a Pure Sinewave inverter

    what about software changes for feedback values? Is there any need to modify it?


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    Re: Pic 16f876a Pure Sinewave inverter

    Hello, I'm looking for some pure sinewave inverter. Cause I'm now writing and almost finishing my diploma thesis where is practical major small photovoltaic power plant. Now I have this schematic:

    PV panel, DC/DC converter with PIC16F876A, battery and trivial dc/ac inverter with square wave.

    So I need to find some pure sinewave inv with switcher "220V,Charge/Ups" which is in modified schematic by maharadga, could u help me please?

    I will analyze back influence of my power plant and I need pure sinewave inverter.

    Thanx so much.


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  6. #666
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    Re: Pic 16f876a Pure Sinewave inverter

    Hello to all.
    My inverter work fine. If increase the power, inverter stop, and both led no light. After a few second inverter go to start. It is OK.
    I have no idea where to change to increase the maximal power with 10%?
    I think may put a resistor in parallel with the current transformer (secondary), but I do not know the value.

    Best regards


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  7. #667
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    Re: Pic 16f876a Pure Sinewave inverter

    Very nice!
    Maybe you should use a trimer pot. with value of ~ 47kohm or higher and then carefully experiment with correct position, but you have to check ACU voltage also.

    Regards


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  8. #668
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    Re: pwm inverter circuits

    Quote Originally Posted by Taner View Post
    My design is a sine-wave stand-alone PWM voltage-source inverter (Not UPS)
    with PIC16F876A MCU, with parameters: Uin=12V DC, Uo=230V AC, 50Hz, P=500W.
    Inverter have an integrated input under/over voltage protection, output voltage regulation, output current protection and overtemperature protection.
    Output voltage is a pure sine-wave, generated with built-in PWM module of PIC MCU,
    with frequency 20Khz.
    :D
    Hi Taner

    I have a doubt in the sircuit

    is this inverter has any standby source like AC power?

    What about re charging the battery

    Regards

    Suresh


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  9. #669
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    Re: pwm inverter circuits

    hi Mr.Taner and all of friends
    I would like to discuss some issues in his inverter design. This design is so interest. I also tested and constructed it. The output is fine results. But, at the output voltage's amplitude is around 170Vac, Pure sine wave form is stable. In order to get the 200 Vac we adjust the gain of the voltage sensing amplifier. However, it can not handle to the variable load. It is stable at 20 Watts (small load). We would like to handle more load to the desired 550 Watts and more. So Some of the factors and source code Program will be updated. I would like to post of my testing results as well as simulations and experimental test results as attachments in order to discuss and suggest for the improvement of taner's design. I would like to thanks a lot for all friends in our forum.
    all of friends, After downloaded and seen my experimental results, Pls give me valuable suggestions and advices.
    with regards
    thuhtay

    Simulation results
    88_1306272200.jpgSimulation Output Waveform of Pure Sine Wave Inverter
    24_1306272200.jpgPeriodic PWM signals and Directional signal
    52_1306272200.jpgPWM output signals of the Pre-driver circuitries
    42_1306272200.jpgPWM Output Waveforms of the High Side MOSFETs57_1306272200.jpgPWM Output Waveform of the Low Sided MOSFETs

    Experimental Test results



    Here, we can see that simulation and experimental results are same as the desired outputs
    Last edited by thuhtay; 25th May 2011 at 11:07.


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  10. #670
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    Re: Pic 16f876a Pure Sinewave inverter

    Hi all friends
    Here, we can see the results of pure sine wave output with respect to 20 kHz PWM signals. It output waveform is so clean sine wave but the voltage amplitude is about maximum 170 Vac nearly. So, how do you exchange or update the program source code or circuitries. I will be discuss the notable point in source code with all friends in coming next post.


    with regrads
    thuhtay


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  11. #671
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    Re: Pic 16f876a Pure Sinewave inverter

    Hm, I suppose output transformer is as it should be?

    Regards



  12. #672
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    Re: Pic 16f876a Pure Sinewave inverter

    Hello Friendz,

    This is my first touch in inverter circuits experience, & I have decided to design and build a true sine wave inverter as my final year project. It seems interested here because im sure my fellow technical friends will help me out, so pls do help me for my up coming doubts regarding my project.

    Regards



  13. #673
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    Re: Pic 16f876a Pure Sinewave inverter

    thuhtay some of our friends had the same problem before, you need to go through the whole thread, so you can know which type of problems arised in this circuits and how they removed, once you go through, you can get answers to many of your questions, its recommended, we all are here to help, but there is always a home work before a constructive discussion

    Best Regards



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    Re: Pic 16f876a Pure Sinewave inverter

    Hi jami007 and all of friends, Californiajoe
    My problem is accomplished, the output voltage is about 230 Vac, the expected average efficiency is about 70%. Do you experiment this inverter design with load test. In my load test experiment, it can be handle good efficiency and pure sine waveform at 300 Watts. And then, In 400 watts and 500 watts load conditions, the output voltage slightly decreased and the waveform is clipped at the peaks. To handle more output power, I think that we will be upgrade taner's design with switch mode type.
    maharadga is also continue to construct UPS design. I also interest his work. But, I think that he consider the current sensing output is adjust at fixed 2.5 V signals and also Other circuitries such as a/b sensing is changed. I think it will be change either source code or use without ab sensing source code. I also want to discuss maharadga for his research.
    The next experimental results are also posted. Thank for interesting our blog!!!



    I would like to meet Mr.Taner again in this post to discuss logical consideration of his source code. Moreover, To improve this design and upgrade other facilities, we should be discuss with all friends especially the pioneer designer Mr.Taner
    with respects
    thuhtay



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    Re: Pic 16f876a Pure Sinewave inverter

    hi tanner
    this is my first time in this forum.
    could you please tell us how to write the program in assembly code, only the lookup table and the output voltage regulation
    thanks

    ---------- Post added at 03:09 ---------- Previous post was at 02:47 ----------

    hi tanner
    this is my first time in this forum.
    could you please tell us how to write the program in assembly code, only the lookup table and the output voltage regulation
    thanks

    ---------- Post added at 03:11 ---------- Previous post was at 03:09 ----------

    hi tanner
    this is my first time in this forum.
    could you please tell us how to write the program in assembly code, only the lookup table and the output voltage regulation
    thanks



  16. #676
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    Re: Pic 16f876a Pure Sinewave inverter

    Very good work. New disighn for PCB looks excelent. If I see correct, your transformar has double coil?
    With increasing of the load you have to check also Ubat.

    Regards


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  17. #677
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    Re: Pic 16f876a Pure Sinewave inverter

    Some time ago Taner told that this inverter works fine under 300 watts load, thuhtay can you please send me the PCB layout of the circuit, also will you please post the models of current and Voltage Transformers

    Best Regards



  18. #678
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    Re: Pic 16f876a Pure Sinewave inverter

    Hi jami007
    I think that A'/B signal is not 50Hz PWM signal in the C program source. It is only the directional signals 1 or 0 in order to alternate switching 20kHz PWM for 50 Hz half-cycle sine wave using SN74HC257D multiplexer. It is the command to generate the each driven PWM for positive half cycle and negative half cycle. I think the CCP2 PWM module is not used in this algorithm. It can see that the switching 20kHz PWM signals within 50Hz are generating sequentially using CCP1 PWM module with respect to the sine look up table 32- bits PWM duty cycle array. how do you think it is true?

    ---------- Post added at 22:18 ---------- Previous post was at 22:09 ----------

    Quote Originally Posted by jami007 View Post
    Californiajoe please mention hex file is for which device??? 16F876A or 16F877A???

    ---------- Post added at 04:05 PM ---------- Previous post was at 03:54 PM ----------

    SN74HC257 is a data line selector

    when A'/B= L it will give value from A at output (L or H), B is dont care
    when A'/B= H it will give value from B at output (L or H), A is dont care
    ( G'= L to enable chip)

    I think it should be more like PWM

    ---------- Post added at 04:09 PM ---------- Previous post was at 04:05 PM ----------

    LM393 is a dual comparator, output should be PWM and PWM' at pin 1 and 7, check this on scope

    ---------- Post added at 04:11 PM ---------- Previous post was at 04:09 PM ----------

    A'/B is a 50Hz sine wave signal

    ---------- Post added at 04:14 PM ---------- Previous post was at 04:11 PM ----------

    ohh.... sorry.... A'/B is a square wave 50Hz, 50% duty cycle signal
    Hi jami007
    I think that A'/B signal is not 50Hz PWM signal in the C program source. It is only the directional signals 1 or 0 in order to alternate switching 20kHz PWM for 50 Hz half-cycle sine wave using SN74HC257D multiplexer. It is the command to generate the each driven PWM for positive half cycle and negative half cycle. I think the CCP2 PWM module is not used in this algorithm. It can see that the switching 20kHz PWM signals within 50Hz are generating sequentially using CCP1 PWM module with respect to the sine look up table 32- bits PWM duty cycle array. how do you think it is true?

    ---------- Post added at 23:13 ---------- Previous post was at 22:18 ----------

    Quote Originally Posted by jami007 View Post
    Some time ago Taner told that this inverter works fine under 300 watts load, thuhtay can you please send me the PCB layout of the circuit, also will you please post the models of current and Voltage Transformers

    Best Regards
    Hi fri 'jami007'
    I posted my PCB design which is developed by using Circuit Maker 2000. Current transformer is constructed with reference (http://www.es.co.th/Schemetic/PDF/TZ2L9-TAEH.PDF). The Output Transformer rating is around 8Vac (Primary) to 250 Vac (secondary) E-I iron core low frequency transformer (50Hz).

    Switching Controller PCB Design

    H-Bridge Inverter PCB Design

    Best regards
    Last edited by thuhtay; 1st June 2011 at 00:24.


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  19. #679
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    Re: Pic 16f876a Pure Sinewave inverter

    I just gave the example of pwm in this algorithm, A'/B is a square wave 50Hz, 50% duty cycle signal

    ---------- Post added at 10:49 ---------- Previous post was at 10:48 ----------

    you are so right it is only directional signal 1 or 0



  20. #680
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    Re: Pic 16f876a Pure Sinewave inverter

    Quote Originally Posted by thuhtay View Post
    Hi jami007
    I think that A'/B signal is not 50Hz PWM signal in the C program source. It is only the directional signals 1 or 0 in order to alternate switching 20kHz PWM for 50 Hz half-cycle sine wave using SN74HC257D multiplexer. It is the command to generate the each driven PWM for positive half cycle and negative half cycle. I think the CCP2 PWM module is not used in this algorithm. It can see that the switching 20kHz PWM signals within 50Hz are generating sequentially using CCP1 PWM module with respect to the sine look up table 32- bits PWM duty cycle array. how do you think it is true?

    ---------- Post added at 22:18 ---------- Previous post was at 22:09 ----------



    Hi jami007
    I think that A'/B signal is not 50Hz PWM signal in the C program source. It is only the directional signals 1 or 0 in order to alternate switching 20kHz PWM for 50 Hz half-cycle sine wave using SN74HC257D multiplexer. It is the command to generate the each driven PWM for positive half cycle and negative half cycle. I think the CCP2 PWM module is not used in this algorithm. It can see that the switching 20kHz PWM signals within 50Hz are generating sequentially using CCP1 PWM module with respect to the sine look up table 32- bits PWM duty cycle array. how do you think it is true?

    ---------- Post added at 23:13 ---------- Previous post was at 22:18 ----------



    Hi fri 'jami007'
    I posted my PCB design which is developed by using Circuit Maker 2000. Current transformer is constructed with reference (http://www.es.co.th/Schemetic/PDF/TZ2L9-TAEH.PDF). The Output Transformer rating is around 8Vac (Primary) to 250 Vac (secondary) E-I iron core low frequency transformer (50Hz).

    Switching Controller PCB Design

    H-Bridge Inverter PCB Design

    Best regards

    Nice design can you please share circuit maker 2000 design file

    thanking you

    Fragrance



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