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TIDA-01168: Paralleling Two Bidirectional DC/DC Systems

Antonio Fadhel
Genius 9410 points
Part Number: TIDA-01168
Other Parts Discussed in Thread: LM5170-Q1,

Hi Team,

Can 2 independent TIDA-01168-type bidirectional converters (LM5170-Q1+C2000 implementing ACMC loop) be paralleled? The goal is to design a 1.5kW system that could be paralleled to double the output power. Can you please recommend any HW changes or communication between the 2 MCUs needed to implement this?

Thanks,

Antonio

  • 0
    TI__Intellectual 2541 points

    Hi Antonio, I will have a look at the subject this afternoon. 

    Thanks for your understanding, 

    Jiri

  • 0
    TI__Intellectual 2541 points

    Antonio, 

    I understand that you want two independent units around 750W each that you can eventually parallel. The datahseet described the paralleled operation of the LM5170-Q1 device in detail. There can be only one voltage loop in the system. For this reason, you would need to implement a feature that disconnects one voltage loop. This is very easy.

    • One DC-DC converter acts as a "master". The voltage control loop measures the output voltage and calculates the PWM for ISETD signal.
    • The second DC-DC converters acts as a slave. The ISETD pin connects directly to the ISETD signal from the master. Same for DIR and EN signals.
    • The master DC-DC shall detect the slave and adjust the compensation for the voltage loop.

    I hope this helps, 

    best regards, Jiri

  • 0 in reply to Jiri Panacek85
    TI__Genius 9410 points

    Hi Jiri,

    Thanks for the feedback. However, the issue is that the 2 systems are separate PCBs (and enclosures) with their independents C2000 control MCUs and the ISETD pins cannot be connected. Each system will have 2 LM5170-Q1 configured as you mentioned for master/slave, but we are trying to understand if there is a way to parallel the finished converters with each other. I.e. if someone had 2x TIDA-01168 boards , how would they set them up for parallel operation? 

    Thanks,

    Antonio

  • 0 in reply to Antonio Fadhel
    TI__Intellectual 2541 points

    Hi Antonio, I am afraid this is not easily possible. The only option is having the CC/CV mode (constant-current, constant-voltage) implemented in both DC/DC converters. This is doable in software by limiting the max value on ISET pin.

    Behavior would be as follows:

    Under light-load conditions, only one power supply (whichever output voltage is higher) delivers power to the load. When the load starts increasing, sill only one PS delivers power until the point the current to the load reaches the constant current limit. This case the output of the "higher" PS lowers down and the second PS starts delivering power to the load too.

    I am not sure if this behavior would be acceptable. 

    Best regards, Jiri