Generate variable Duty cycle automatically after each cycle (Ts)

I need to generate 3 different duty cycle automaticaly. D1+ D2+D3 =1

Such as in the first cycle D1= 0.4 , D2=0.5 and D3 =0.1.

Such as in the 2nd cycle D1= 0.3 , D2=0.6 and D3 =0.1. it can be any thing but different than first cycle; however, the sum should be 1.

In the picture delay there are three signal with a constant delay, i just need to develope these automaticaily with variable delay in each cycle.

Please assist

Thank you

Answer 1

[Xu Liu]

You can achieve your requirements by modifying PWM duty cycle.that's not complex actually.