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  1. J

    [SOLVED] Pic 16f876a Pure Sinewave inverter

    Hi Pierre Congratulations. Could you share what are the modification have you done in soft with us?? Regards Jags
  2. J

    [SOLVED] pic16f72 sinewave inverter with asm codes. not working.

    Hi jayananda, please give me the ASM file & HEX file on which your inverter is working, and also tell me the compiler name which you are using. The ASM code which i have found from a forum is not properly documented and also not working after compilation. Thanks & regards Jags
  3. J

    [SOLVED] Pic 16f876a Pure Sinewave inverter

    Hello Taner Thank you for your response. One more question, please go through the sample code of your program below. output_low(PIN_C3); set_adc_channel(stdby_chan); // check vref value; delay_us(10); for(i=0; i<32; i++) { volt_ref=read_adc(); volt_ref_temp+=volt_ref; if(i==31) {...
  4. J

    [SOLVED] Pic 16f876a Pure Sinewave inverter

    some body please answer my previous two posts. jagspaul
  5. J

    [SOLVED] Pic 16f876a Pure Sinewave inverter

    Hi Pierre Did you connect oscilloscope at uC PWM out pin?? If not connect it when your inverter is running (giving output voltage) and take snap of the picture and send us. jags
  6. J

    [SOLVED] Pic 16f876a Pure Sinewave inverter

    Hello Taner Some mistake found in analog reading section of your code, these are listed below. Schematic reference. (PIC16F876A) RC0 = #OE (# = BAR) RC1 = #A/B RC2 = PWM RC2 = MUX_A RB1 = MUX_B AN0 = b/a AN1 = Volt/Stdby AN2 = curr_h/l AN3 = V_BAT AN4 = V_OUT (MC14053) A + C = MUX_A B =...
  7. J

    [SOLVED] Pic 16f876a Pure Sinewave inverter

    Hello Taner Your system is 12 volt DC to 230 Volt AC Inverter, but I need to build a 120 volt i/p DC to 230 Volt o/p AC sign wave inverter. In this regards please tell me what are the consideration I have to do in your existing system? One more thing, please go through the sample code of your...
  8. J

    ringing in flyback SMPS

    Hello FvM, Thank you for your reply. I have made a 12V 2A discontinuous mode flyback SMPS. Which is working fine but some ringing is there in output rail. see this links . for this reason I want to make the same PSU in continuous mode to see whether the ringing is removed or not. One more think...
  9. J

    ringing in flyback SMPS

    One question, the ringing tendency is less in case of flyback continuous mode rather than discontinuous mode. Please tell me whether it is correct or not. Regards jagspaul
  10. J

    Why high ripple present in my first SMPS project

    Hi everybody, I think the issue may be due to bad PCB layout. I request you once again to please send me a PCB layout which quite matches with my design (if required little bit changes, I will do this). One question, the ringing tendency is less in case of flyback continuous mode rather than...
  11. J

    Why high ripple present in my first SMPS project

    I have planed, first develop different types of prototype SMPS to gather the skill on this field as I am new in this field. I know lot of integrated MOSFET SMPS controller is available in the market but I am interested only with discrete MOSFET and SMPS controller chip and soft ferrite core by...
  12. J

    Why high ripple present in my first SMPS project

    Please download the schematic attach here with and post your suggestion.
  13. J

    Why high ripple present in my first SMPS project

    Yes this is off load, I checked it with full load also and found more or less same picture with high p-p value. Added after 27 minutes: I have no differential probe, only have a single ended 1X/10X probe. So I can not connect it with high voltage section (non Isolated). I found same result...
  14. J

    Why high ripple present in my first SMPS project

    Thanks for reply. The Max ripple amplitude is 6volt p-p 100khz. Is it acceptable ? Tomorrow I will send the schematic and PCB layout file.
  15. J

    Why high ripple present in my first SMPS project

    I have made one 12 volt 2 amp smps using uc3844 pwm controller with MOSFET switching frequency 100 Khz. When I measure the output with digital and analog multimeter the output is stable for both meters. But when I connected the output to oscilloscope (2volt/dev and 2us/dev) high ripple voltage...
  16. J

    Virtual assistance in electronix

    I am new in SMPS system. I have only theoretical idea (no practical). I have made the 12 Volt 1Amp rating SMPS with ST Viper22 PWM controller and found excellent result. But i want to built SMPS only with discreet PWM current mode controller (UC3844/45) and power mosfet, which is readily...
  17. J

    need help for 12 volt 4 Amp flyback SMPS Design with UC3844

    12volt 2 amp smps using uc3844 I know the theory of DCM & CCM flyback SMPS (Isolated), but I want to know in design equation how it is differ.
  18. J

    need help for 12 volt 4 Amp flyback SMPS Design with UC3844

    12volt smps I am new in SMPS system. I have only theoretical idea (no practical). I have made the 12 Volt 1Amp rating SMPS with ST Viper22 PWM controller and found excellent result. But i want to built SMPS only with discreet PWM current mode controller (UC3844/45) and power mosfet, which is...
  19. J

    12 watt SMPS using uc3845 & MJE13007

    smps design forum using uc3845 Thank you for your response. Basically i don't have oscilloscope. Finaly i have replaced the BJT with Mosfet 2SK727 and fix the problem. I think Vceo of MJE13007 is not sufficient for this application. Now the problem related with the stability fo the system. The...
  20. J

    12 watt SMPS using uc3845 & MJE13007

    uc3845 i have made a 12V ,1 amp SMPS Using uc3845 and MJE13007 (NPN Transistor). for load current 100 mA the smps is stable but whe load current is 500 mA the transistor getting damage (Base collector junction short circuit). please help. regards Jagadish

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