+ Post New Thread
Results 1 to 3 of 3
  1. #1
    Newbie level 2
    Points: 96, Level: 1

    Join Date
    Feb 2019
    Posts
    5
    Helped
    0 / 0
    Points
    96
    Level
    1

    SPWM Inverter Calculate DC bus current

    Hello everyone,

    I am designing an SPWM inverter

    The output is 220 V 2.5A
    DC BUS Voltage 320V

    what should the minimum of DC bus Current ?

    •   AltAdvertisement

        
       

  2. #2
    Super Moderator
    Points: 75,476, Level: 67
    Achievements:
    7 years registered
    Awards:
    Most Frequent Poster 3rd Helpful Member

    Join Date
    Apr 2014
    Posts
    15,301
    Helped
    3485 / 3485
    Points
    75,476
    Level
    67

    Re: SPWM Inverter Calculate DC bus current

    Hi,

    Take a piece of paper and draw the exoected currents.

    You will soon find out that your information is no sufficient.
    * I assume the 220V, 2.5A is AC....but what kind of AC? RMS or amplitude or peak to peak?
    What phase angle?
    What is the expected inverter efficiency at this load?

    And what DC bus current?
    * The absolute maximum peak value (within 100ns or so)
    * Or the maximum expectable average current?

    Klaus
    Please don´t contact me via PM, because there is no time to respond to them. No friend requests. Thank you.


    1 members found this post helpful.

    •   AltAdvertisement

        
       

  3. #3
    Advanced Member level 5
    Points: 9,413, Level: 23

    Join Date
    Aug 2015
    Posts
    1,523
    Helped
    554 / 554
    Points
    9,413
    Level
    23

    Re: SPWM Inverter Calculate DC bus current

    220Vac rms is 311 Vpk, a 320V bus is a little light for this, the DC bus current will be the average current flowing to the load:

    for 2.5A rms, assuming all real power, the Po = 220x2.5 = 550 watts divided by 325 Vbus say = 1.70 amps DC average ...


    1 members found this post helpful.

--[[ ]]--