mahmoudomar91
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Hello
I am making a V/F inverter as a part of my graduation project to control the speed of a single phase 1 hp AC motor by rectifying the 220 V AC then inverting it again into AC voltage with variable V/f with PWM from AVR ATmega32
but i have some problems
1- the output wave gets kinda scrambled when the frequency is over 25 hz but works fine before that
2- i wonder if i can drive the mosfets with just optocoupler PC817 or co i need mosfet driver like IR2110 or IR2112 and if i have to use the IR2110 can you please show me how to connect it ??
3- what is the max timer frequency to use in order that the optocoupler can cope up with (i am using timer 0 & 2 with crystal 12MHz and a prescalar of 8) ??
4- what is the best filter to use for the output (RC or LC ) ??
Thanks alot in advance
- - - Updated - - -
And also do i have to create 4 20V supplies for the Mosfet gate voltages ?? and can i do that with one transformer and 4 bridges ??? or 4 transformers and 4 bridges ??
I am making a V/F inverter as a part of my graduation project to control the speed of a single phase 1 hp AC motor by rectifying the 220 V AC then inverting it again into AC voltage with variable V/f with PWM from AVR ATmega32
but i have some problems
1- the output wave gets kinda scrambled when the frequency is over 25 hz but works fine before that
2- i wonder if i can drive the mosfets with just optocoupler PC817 or co i need mosfet driver like IR2110 or IR2112 and if i have to use the IR2110 can you please show me how to connect it ??
3- what is the max timer frequency to use in order that the optocoupler can cope up with (i am using timer 0 & 2 with crystal 12MHz and a prescalar of 8) ??
4- what is the best filter to use for the output (RC or LC ) ??
Thanks alot in advance
- - - Updated - - -
And also do i have to create 4 20V supplies for the Mosfet gate voltages ?? and can i do that with one transformer and 4 bridges ??? or 4 transformers and 4 bridges ??