svpwm genration using 8051

[abc_de]

hello
can any one help me in svpwm generation for 3 phase inverter. till now i have worked on spwm by pic18f4431.

i have understand only switch pattern.
how to generate desire output frequency?
how to set modulation index?
how to set carrier frequency?

please help me

 

[KlausST]

Hi,

If you did an internet search you found a lot of informations.
In my eyes it makes not much sense to repeat all this information here in this thread.

--> look for reliable and detailed descriptions, tutorials, documents, videos....
Most reliable are from semiconductor manufacturers and universities.
Don´t rely on brief descriptions from random hobbyists. (They may be good or may not be good)

For sure the "reliable" ones come with a lot of stuff you may never heared before... but that´s learning. Go through them and soon you will understand the details.

After that you are welcome here to ask more detailed questions.
* Give (links to) documents you refer to
* show us your sketch - even hand drawn
* show us your idea
* show us your code
* tell us what you expect and what is not like expected. (scope pictures...)

Klaus

 

[FvM]

Which 8051 chip are you planning to work with? Standard 8051 has no hardware features supporting pwm generation, no good idea to use it for a pwm project.

 

[abc_de]

@fvm i am planning with 89c51.
@ KlausST
this link which i am following https://electrotech4u.blogspot.com/2011/07/implementation-of-space-vector.html

till now i have learn about switch state and angle calculation. by which we can calculate the vector timing.
but still very confused about software implementation

 

[KlausST]

Hi,

till now i have learn about switch state and angle calculation. by which we can calculate the vector timing.

The angle is rotating, rotating with time. 360° per full wave. For 50Hz this are 360° in 20ms.
So if you are able to calculate the angle (at a given time) then "this is the timing".

Klaus

 

[abc_de]

@klausst one more thing how many angles are necessary from 360degree. for example i just presume for 20msec for 360degree then after every 2.5msec. i have to cal. angle ?
also i am following this link https://www.switchcraft.org/learning/2017/3/15/space-vector-pwm-intro

in this website they have show the timing at different angles.

please correct me if i am wrong

- - - Updated - - -

i mean for every 2.5msec i have to follow 8 sectors....
yes then how many angle cal is required?