What type of 24 VDC to 730 V converter is this?
Flyback without galvanic isolation, and a poor one.
If your schematic does not match reality (&quot;The feedback connection is actually via a voltage divider and an optocoupler but I just simplified it for easing the sketch&quot;), then it does provide galvanic isolation.
If you simulate it, you will see that two of the diodes may or may not be forward biased when the transistor is on and the circuit will operate in forward mode, but it depends on your output voltage, transformer inductance, transformer leakage inductance, winding direction (I assumed flyback in the schematic below) and switch frequency. When the switch is off and any energy is stored in the core (or air gap), it's a flyback.

I'll let you experiment at determine if more energy is transferred during the flyback or forward period. Hint: Vary the output voltage and observe what happens.