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Difference between sine wave and PWM

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Maverickmax

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Hi

I need to know what is the difference between sine wave and PWM when using a microcontroller for driving inverter section with IGBT.

What I understood is that microcontroller can be used to look up the table for sine wave.

Im sure that some of microcontrollers have PWM generator which need to be configured...

One more thing...should I use simple lowpass filter (Resistor and capacitor) to remove high frequency content?

By the way is it possible to control PWM in the range between 2kHz to 10kHz by adjusting the knob?


Maverick Max
 

Nimer

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pwm filtered sinewave

hi
there are many methods of PWM , one of them is sinosuidal PWM
that uses a sine wave to be compared with triangular signal to produce the
PWM wave required .
regarding the use of microcontrollere pic 16F877a
has such capapilities

best regards
 

Maverickmax

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pwm sine wave capacitor

Ok

Which method is the best in term of cost-effective, less time consumation, reliable?

Maverick Max
 

haytham

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pwm vs sine wave

PIC16877,76,74,73 have embeded powerful PWM generator.
You may get use of them
 

Davood Amerion

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pwm frequency content

Hi

I need to know what is the difference between sine wave and PWM when using a microcontroller for driving inverter section with IGBT.

What I understood is that microcontroller can be used to look up the table for sine wave.

Im sure that some of microcontrollers have PWM generator which need to be configured...

One more thing...should I use simple lowpass filter (Resistor and capacitor) to remove high frequency content?

By the way is it possible to control PWM in the range between 2kHz to 10kHz by adjusting the knob?

If you mean diffrence of Sinusoidal PWM and PWM :
SPWM is the PWM which its pulse widths change according to sine wave value.
Yes you can use RC lowpass filter wherever output frequency is much lower than PWM frequency.
Yes if you use some microcontroller such as 16F877 which have ADC and PWM,
you can use potentiometer connect to ADC input and generate PWM,
but its maximum frequency depend on clock frequency of microcontroller.

Regards
Davood
 

hoang_quy

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ups pwm v/s sine wave

If you don't use feedback ,It is very easy .You design the sintable from exel .Examle :Use function ROUND(1024*SIN((2*3.14159*($C1))/400),0) for 400point per cycle .If you have feedback ,It is hard with some control such as PID,Fuzzy...
 

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