**Part Number:**TIDM-02002

**Other Parts Discussed in Thread:**TIDA-010054

Greetings,

I have been trying to calculate the values of a resonant tank for CLLLC DAB based on TIDM-02002 and simulate it with limited success.

I have used the provided excel spreadsheet (slightly modified) to calculate the values of resonant tank and got following results:

While I was trying to settle down on the values of the resonant tank, I used provided CLLLC_tankSelection matlab script to calculate the gain and this is where I run into an issue.

The system I am designing would be charging and discharging LiFePO4 16S1P battery modules and certainly more of such modules in parallel i.e. 16S2P, 16S3P etc.:

The main concern I have at the moment is that such battery module would have a dc resistance in the range of miliOhms as far as I understand.

Question 1. I calculated that RL @ max power (at the voltage where I need max power during charging) is 0.936Ohm, and if I work backwards and use battery dc resistance I get that max power for 0.2Ohm battery resistance would be at 24V. Would it be possible to move this max power point somewhere closer to battery charging voltage? would that yield max charging power? or am I misunderstanding something.

Question 2. For the battery resistance that I assume to be in miliOhms range the Gain graph that I get when running provided matlab script is very shallow (Which would mean that DC-link would have to have very little ripple for the DAB to function in its intended switching mode, if I understand the theory correctly. See figure attached below) What would be the best way to correct it? Again this could hinge on my misunderstanding of RL as I assume it to be a battery pack's dc resistance.