hi everyone !
im designind a inverter which low power at beginning.
the generating spwm way is comparing two type of signal(sine and triangle) . the main signal is 50Hz sine wave which generated by icl8038 pulse generator. the carrier signal is 22kHz triangle wave which also generated by icl8038 pretty old but good ic.
the compared spwm is at first zero and going to opamp's Vcc voltage and at least going back to zero . all those times the spwm signal never goes back to zero. because of that situation , icannot use any logic ic's and also mosfet drivers. the problem exactly beggining here !!!
there is a pic of oscilloscope down !
1) what should i do ?
2) should i decrease carrier waveform frequency ?
3) should i use something different way to create spwm signal ?
4) is my spwm signal is good? (at image of oscilloscope, the spwm signal is clamped and in normal it has negative and positive alternans)
5) which way is more suitable for inverter design comparing two type of signal or using a microcontroller ?
the comparison maded by TI's opamp LM324.
im designind a inverter which low power at beginning.
the generating spwm way is comparing two type of signal(sine and triangle) . the main signal is 50Hz sine wave which generated by icl8038 pulse generator. the carrier signal is 22kHz triangle wave which also generated by icl8038 pretty old but good ic.
the compared spwm is at first zero and going to opamp's Vcc voltage and at least going back to zero . all those times the spwm signal never goes back to zero. because of that situation , icannot use any logic ic's and also mosfet drivers. the problem exactly beggining here !!!
there is a pic of oscilloscope down !
1) what should i do ?
2) should i decrease carrier waveform frequency ?
3) should i use something different way to create spwm signal ?
4) is my spwm signal is good? (at image of oscilloscope, the spwm signal is clamped and in normal it has negative and positive alternans)
5) which way is more suitable for inverter design comparing two type of signal or using a microcontroller ?
the comparison maded by TI's opamp LM324.