Aug 5, 2013 #1 J john120 Banned Joined Aug 13, 2011 Messages 257 Helped 11 Reputation 22 Reaction score 10 Trophy points 1,298 Activity points 0 Hello everybody can you please help me to solve a problem regarding the on time and off time difference of SPWM generation for DC-AC Converter. I refered to Tahmid blog:https://tahmidmc.blogspot.com/2013/02/generation-of-sine-wave-without-eccp_16.html,I made a circuit using PIC16F876A I get the signal which are not equal according to their on and off time;I changed and use PIC16F877A as Tahmid proceeded but I get the same signals as the first I had and all those are not perfect they don't look like the ones which are on Tahmid's Blog:https://tahmidmc.blogspot.com/2013/02/generation-of-sine-wave-without-eccp_16.html Fig 3 and Fig4. See what I have with Oscilloscope in Proteus and even with physical oscilloscope I have the same signals. I want to control the MOSFET which are powered at 420V I think if I use such signals there will be a short circuit. Please help. Thanks. Attachments Graphs.zip 83.9 KB · Views: 78
Hello everybody can you please help me to solve a problem regarding the on time and off time difference of SPWM generation for DC-AC Converter. I refered to Tahmid blog:https://tahmidmc.blogspot.com/2013/02/generation-of-sine-wave-without-eccp_16.html,I made a circuit using PIC16F876A I get the signal which are not equal according to their on and off time;I changed and use PIC16F877A as Tahmid proceeded but I get the same signals as the first I had and all those are not perfect they don't look like the ones which are on Tahmid's Blog:https://tahmidmc.blogspot.com/2013/02/generation-of-sine-wave-without-eccp_16.html Fig 3 and Fig4. See what I have with Oscilloscope in Proteus and even with physical oscilloscope I have the same signals. I want to control the MOSFET which are powered at 420V I think if I use such signals there will be a short circuit. Please help. Thanks.