Hi,
Few years back, i did that exacte same project, using a full bridge built of IRFB630 Mosfet, to control a DC motor and make it work on the Four-Quadrant, meaning: two directions with brake regeneration. To control of the full bridge i used pwm signal, in a manner to have asymmetrical PWM in the output of the bridge. I can help you with that. i have a couple of questions though :
- do you want to generate the basic PWM using code - microcontroller-?
- or just analog electronic components?
- the asymmetric PWM signal (the one you showed in the picture), do you want this signal; at the output of the full bridge, then the bridge will control a load that needs asymmetrical PWM; it would help to know, what kind of load you will be using?