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TIDA-050063: Hardware selection

ZY W
Prodigy 60 points

Part Number: TIDA-050063

Hi,

Hope you are well.

In the TIDA-050063, the pre-charge circuit design (the link is showing as below). I want to understand how to select the inductor and the MOSFET.

 www.ti.com/.../tiduf21a.pdf

In the design, the average current is calculated that based on charge time, namely I=C*dV/dt (let us use the example, 4A for the 800V charging). This current value is using for the inductor and MOSFET selction, right? 

My question is, If the DC current is 600A in the full-load scenario, is it okay to use a 10A inductor and MOSFET? Will these stuff not get hot and damage? 

Can you please explain the basic rule to select the components of precharge circuit, espeicially fo the high power application.

Many thanks,

Kind regards,

Zu

  • 0
    TI__Expert 8801 points

    Hello Zu,

    The precharge circuit happens at the very start of sytem powering on, it is only to charge up the link capacitance. Now since link capacitance voltage is same as battery voltage, then turn-on contactor. The contactor has low resistance and can handle the high current load such as 600 A.

  • 0 in reply to Tilden Chen
    Prodigy 60 points

    Hi Tilden,

    Thanks for your reply. 

    Based on your reply, I can understand that I can select small current value's inductor.

    My other question is, when the contactor has been turned on, should the MOSFET be turned off? Because the MOSFET's resistance is also low, a large current will flow at this time. this question relates to the selection of the MOSFET. 

    Furthermore, for the rectifier circuit, would you recommend using this pre-charging circuit? or would you recommend using a traditional three-phase pre-charge circuit, namely contactor and NTC. 

    Many thanks for your help.

    Kind  regards,

    Zu