• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 40 subscribers
  • Views 472 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TIDA-00364: DC LINK CAPACITOR & INRUSH CURRENT PROTECTION

kalyanraj durairaj
Prodigy 30 points
Part Number: TIDA-00364

Hi,

This is Kalyanraj, currently working on the 5kW PMSM drive system.

spec:

input voltage: 36-60V (battery)

Fsw: ~20kHz

output current max: 136A

Due to size constraints, we are facing some issues with DC link capacitor and inrush current protection implementation. I request you to clarify on the below points,

1. For the given spec, calculated ripple current value is ~ 70A. For this much high current, number of capacitor need to be used is more (say 20). 

Is it recommended to operate the system without these capacitors? (Battery may supply the ripple current to inverter) 

2. If DC link capacitor is mandatory, for this voltage range (60V max) inrush current protection is needed or not?  

Regards,

Kalyanraj D

  • 0
    TI__Intellectual 1185 points

    Kalyanraj,

    Capacitors will be needed supporting the instantaneous current requirements especially for high dynamic loads. For non-dynamic loads, capacitors can be reduced, Please refer http://www.ti.com/tool/TIDA-00472 for one such use-case demonstration.

    Inrush current requirement is highly specific to your application. For controlling inrush current, you can think of a series switch in between whose ON time can be controlled.

    Thanks,

    Jasraj