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Original question:

SSR TIDA-050063: Enquiry on the technical capability

TIDA-050063 Schematic

Monica bagade
Prodigy 170 points
Other Parts Discussed in Thread: TIDA-050063, PMP21735

Hi team,

I am working on BMS with 48V, 60A rating. I want to explore this active pre charging circuit for my application

I am not able to understand few things in the schematic.

1. As we have to charge capacitor till rated voltage, Vcap= 400V, but  inductor side of R6 is grounded. How current will flow and voltage will build up? Please excuse me but I am not able to get it.

2. This is high side side drive circuit as load is connected to source, but UCC27517AQDBVRQ1 is low side driver.

3. Once the capacitor is charge, we should not turn on the precharge circuit. Do we have to use voltage measurement at capacitor?

It would be really helpful, if you can elaborate.

Thanks and regards,

Monica

  • 0
    TI__Prodigy 120 points

    Hello Monica,

    The TIDA-050063 design is meant to charge the capacitors to the same voltage as the Vin supply. It is a hysteretic Buck topology configured as a constant-current source. The inductor current ripple will always "bounce" between a programmed peak current and a programmed valley current, where the average inductor current becomes the average charge current into the capacitor. Once the capacitor voltage reaches Vin, the high-side switch (i.e. FET) remains ON.

    I believe for your application the more appropriate design to consider will be PMP21735: www.ti.com/.../PMP21735
    It does have a lower input voltage range than the 48V of your system, as well as potentially other design specs being different, but it is a great starting point.

    Regards,

    Hrag

  • +1 in reply to Hrag Kasparian
    Prodigy 170 points

    Thank you for the reply.

    I can use TIDA-050063 design circuit by changing inductor calculation for my application with 48V battery input and 48V capacitor, right?

  • 0 in reply to Monica bagade
    TI__Prodigy 120 points

    Hello Monica,

    Yes.  If the capacitor(s) (at the output) needs to be charged all the way up to the input voltage, the TIDA-050063 can be used, with the appropriate modifications. If the capacitor(s) need to be charged up to a voltage that is higher than Vin, then a step-up converter will be needed.  In the case of the PMP21735 design, an isolated Flyback topology is used to step the input voltage (9Vin to 32Vin) to 400V, which the capacitor gets charged to.

    Regards,

    Hrag

  • +1 in reply to Hrag Kasparian
    Prodigy 170 points

    Thank you for the reply.