Optimised PWM? - question about transistors

[ee01akk]

Optimised PWM?

I am using optimum PWM to control the transistors in my inverter circuit
. In optimum PWM, to eliminate harmonics, switching angles need to be calculated for turning transistors on and off. Does anyone know how to find out which pulses belong to certain switches being turned on or off.

e.g. 1 pulse might control transistors 1and 2 in my inverter or it might control 3 and 4. How do you know which is correct?

 

[23402027]

Re: Optimised PWM?

Shortly ,
you must use zero crossing detector.
I'm sory i'm weak on analogue design, but I know that to control like that you must use zero crossing detector. btw, what is your signal? sine or what?

 

[neelandan]

Re: Optimised PWM?

Don Lancaster has extensive info on what he calls "magic sines"

https://www.tinaja.com

You might go there and search for them. It involves switching the active devices at precise instants to minimise the harmonics produced.