About Adaptive SR in LLC.

YUKIOOYAMA

Hi all, I down loaded design files below.

https://www.wolfspeed.com/products/power/reference-designs/crd-22dd12n/

There is training presentation in that design files.

/crd_22dd12n_all_design_files

+training presentation

+ Wolfspeed 22kW High Efficiency Bi-directional DCDC Converter online Oct.pdf

In page 27, that document say "Adaptive SR is achieved …".

There are five parameters listed, but can you please provide more information on how the CPU controls the gate signal based on the state of these signals?

I may be able to understand it if I request the firmware and analyze the code (assuming it is provided in text code not an image file). However, since I am not knowledgeable about software, I wouldn't be able to analyze it even if I have access to the firmware.

Therefore, I would appreciate it if you could provide information about adaptive SR control.

BR, YUKIOOYAMA

Forum_Moderator

Thank you for your post, it has been approved and we will respond as soon as possible.

CChen

Hi YUKIOOYAMA,

Please see below brief description:

Operation mode: Under charging mode, Q1 to Q4 are main switches and Q5 to Q8 are SR switches, revise under discharging mode. The main switches will always turn on before and turn off after the SR switches with a leading or lagging time which is defined by the other four parameters mentioned in the pdf, i.e.:

DC-Link voltage

Output voltage

Output current

Switching frequency

The leading or lagging time is directly related to the current in the SR MOSFETs which is affected by the four parameters above.

Best regards

Carter

TBhatia

Hi, I hope that this answered your question. I will close this discussion for now but if you have a follow up question, please "Start a New Discussion" and we would be glad to support you further.