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TIDA-010054: TIDA-010054

martin supolik
Prodigy 70 points
Part Number: TIDA-010054

Hello

I am going to design bidirectional DC/DC conveter. Here are the design parameters. Uin=400V, Uout=from 44V to 58V, Pout=3000W. Which type of converter is better solution Dual active bridge or CLLLC?

Thank you 

  • 0
    TI__Mastermind 19545 points

    Hi Martin,

    Thank you for the query.

    Given your requirement of fixed bus voltage of 400V and variable battery voltage, Dual Active Bridge is better than a CLLLC. But it will come at a cost. A large variation in phase will be needed to regulate the output voltage and it can increase circulating currents and can hamper efficiency of converter. This where Dual and triple phase shift schemes for DAB can be helpful in increasing the efficiency marginally.

    If there is room for you to vary the bus voltage by 10%, I think CLLLC will be better than DAB. In the CLLLC, in addition to the normal resonant modes of operation additional phase shift can be used as a control parameter to improve operating range.

    Thank you

    Regards

  • 0 in reply to Harish Ramakrishnan5
    Prodigy 70 points

    Hello

    I have already simulated both of the types converter. Switching frequency was 200Khz for both converter. In CLLLC converter secondary LR2 is too small 250nH because it depends on resonant frequency,turns ratio and output power. I am afraid of it becuase so small inductance can be in secondary leakage of transformer and it can be difficult to abide in serious production. Please what do you think about this problem?