Other Parts Discussed in Thread: UCD3138
Hi guys,
I’ve got a couple of questions for you regarding the TIDA-00653. I’m having a hard time understanding what the current loop of the firmware really controls.
My understanding of the circuit is the following:
When the load from one side diminishes, automatically the other voltage is going to become the source.
Let’s say for example there is a high current demand on the 48V. The 12V will then become the generator and the DC/DC will change direction. Once the 12V is the generator, the current seen by the sense logic will be reversed. The MCU will then see this switch and switch its logic.
The part I’m not sure to understand is the following:
If the analog circuits have already electrically made the switch from one side of the converter to the other, what does the logic of the MCU really drive?
Furthermore, I’m going through the code and I can’t figure out which electrical changes will me made once the MCU changes its state in its state machine. What will physically change on the board?
Also, do the PWMs change (any change in frequency/duty cycle) when the converter goes from one direction to the other, or do they always stay the same ?
Ultimately, I’m wondering I don’t see any controller (PI/PID). Who assumes the role of slowly ramping up the voltage of the converter? Is it the UCC2721XDRM circuit that charges the gate?
Thanks a lot for the support, you guys do an amazing job.