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TIDA-00366: Line-to-line voltage

Part Number: TIDA-00366

Dear TI Experts:

I think TIDA-00366 is a wonderful design example!

We can find some specifications in the TIDA-00366 document, shown below.

"Reinforced Isolated Inverter Suited for 200-V to 690-V AC Drives Rated up to 10 kW"

"DC bus input voltage: 400 to 1200 V (Table 1)"

"Motor Three-phase 400-V AC induction motor (Table 1)"

In Page 7 of  TIDA-00366 document, it mentions that Line-to-line voltage (VLL)=415V AC, which is an important parameter for the following derivation.

Could you kindly show me how to get Line-to-line voltage (VLL)=415V AC?  I hope to apply the concept to other designs.

Happy New Year!

Tang Han 

  • Tang, hello and Happy New Year. Your query has been forwarded to our Industrial Systems Motor Drives team. However, the owner of this design is going to be out of the office until his return on Monday, January 7th. Please expect to have an answer back from the team early next week.

    Best Regards,

    J. Fullilove
    Texas Instruments
  • Hello Tang Han,

                                         Thank you for your interest in TIDA-00366. Line to line voltage is considered as 1.732 times of phase voltage. In 366, we have considered 240vac which translates to 415vac. These numbers might vary depending upon regulation in each country. The DC link nominal voltage can be roughly considered to be 1.414 times 415 which translates to 587. The upper limit for DC bus voltage is decided by IGBT module rating and the amount of regeneration allowed with de-rating. In 400vac drives its typically 850vdc, however in this design we have claimed the Vce rating of the module which is 1200v. The lower limit on the DC link voltage is decided by the application and theoretically in this design nothing stops the inverter working at lower voltages provided we stay less than current rating of the IGBT Module. Hope this helps.



  • Dear Navaneeth:

    I am so pleased to hear from you.
    You are really a professional engineer and so kind to a novice. ^_^
    I appreciate your reply so much! I also thank John for passing my question to you.
    Wish you a prosperous new year!
    Tang Han