I need to design dc to ac inverter from DC +12Volt to AC 230. But i need to use PWM to control the inverter. I using "Sinusoidul Pulse Modulation" to control the MOSFET transistor.
When i using PWM to control the MOSFET transistor (inverter). The PWM signal will distortion. I have testing connect the AC load (lamp 230Vac/5W) , the output voltage from inverter drop to ~120Vac.
How to control or maintian the output voltage always 230Vac when connect AC-Load?
Your design is of the driven type.
To regulate the o/p voltage, you need to feed part of the o/p voltage (step-down tapping---->rectify---->filter) and give it to the input. The fed back signal will generate an erroe voltage and o/p correction will take place based on this error voltage.
As far as the o/p waveform is concerned, you have not included (indicated) any form of filter to remoce the carrier. This o/p filter will integrate the pulses to give you sinewave.
Your design is of the driven type.
To regulate the o/p voltage, you need to feed part of the o/p voltage (step-down tapping---->rectify---->filter) and give it to the input. The fed back signal will generate an erroe voltage and o/p correction will take place based on this error voltage.
As far as the o/p waveform is concerned, you have not included (indicated) any form of filter to remoce the carrier. This o/p filter will integrate the pulses to give you sinewave.
U mean the o/p voltage(AC 230Volt) need to step-down tapping---->rectify---->filter.
So that,
step 1) the filter signal will feedback to input
step 2) than compare the input signal with the feedback signal the
step 3) than generate the error signal
step 4) than ??
can you have a block diagram from me, may be i more understand from your block diagram. Your block diagram size don't so big because i no enough point to down load. TQ
How to do the o/p filter will integrate the pulses to give you sinewave?
Your circuit is very simple. Some basic rules of inverter such as complimentary drive with deadzone to drive the o/p bridge are missing. This will result in decreased efficiency, o/p distortion and heating.
I recommend you hit the books and work on some basics. As far as ready reference is concerned, get hold of 12V DC to 230V AC inverter circuit published in ElekTor*
Thank you for your suggestion i will brush- up my basics but now i no have time. I need to complete my project 2 month and this is just of the one part i need to do. Can u help me, i really need your help. How can i improve my inverter? How to design converting astable o/p to trianglular wave?