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      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 

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Found 3 results

  1. Submitted by ramkumar on Mon, 09/10/2012 - 21:37 I see that SVM in vissim is making use of pulse centered SVM approach. Hence, it is getting different output(-1 to 1 range) than the normal non pulse centered SVM aprpoach. Note that there is also a small relationship where Vissim_PC_SVM_output. = 1- 2* NPC_SVM_output.http://www.vissim.com/forums/incorrect_output_or_least_confusing_documen... But I did not understand the logic behind the scaling block between SVM and ePWM block. To reproduce the above problem, use the „acim_vf_openloop50Hz_sim.vsm“ and „acim_vf_openloop50Hz_sim.vsm“. http://www.vissim.com/forums/how_use_sv_pwm_vissimecd#comment-101 Here if f= 0.7, then v= 0.789, SVMop = (-0.789 to +.789), ScalingOp = (+0.106 to 0.895) and not (0 to +.789) Again if f= 0.2, then v= 0.5789, SVMop = (-0.58 to +.58), ScalingOp = (+0.21 to 0.79) and not (0 to +.58) I could not get clarifications for the below questions: Is this scaling correct? Here is my concern: I see a relationship viz. Scaled output =0.5 +0.5Vissim_PC_SVM_output. (i.e. pulse centered output using general TI document). But also Vissim_PC_SVM_output. = 1- 2 NPC_SVM_output (i.e. Non pulse centered output using general TI document). That means Scaled output =1 - Vissim_PC_SVM_output. a. Clearly this scaled output is giving toggle value of the non pulse centered output. So, why are we doing this? b. Also, I see that in the example of „acim_vf_openloop50Hz_sim.vsm“, the output from scaling block are fed directly to the ePWM blocks. But, the example uses the following configuration for the action qualifier, ePWMA: CA Up: 0 ; CA Down: 1 ePWMB: CA Up: 1 ; CA Down: 0 However, as per TI documentation http://www.ti.com/lit/ug/sprug04a/sprug04a.pdf (pg 80), we should use the below config: ePWMA: CA Up: 0 ; CA Down: 1 ePWMB: CA Up: 1 ; CA Down: 0 So, are we using output of duty cycles as cmpa signals (when in fact cmpa signal and duty cycles are complementary)? c. Also, we are again converting a pulse centered switching sequence into a non pulse centered switching sequence (although with a toggle status). Are we then not losing the advantage of the PC output approach? Is there any way that I can have a non-pulse centered output instead of getting PC output directly from SVM? How do we do that? Then we do not need any scaling for ePWM. Thanks!
  2. Submitted by Joe on Fri, 10/23/2009 - 21:05 There are 2 inputs to the VisSim ePWM block and when you right click there are many many options. Are there any other blocks or items that go with or belong with the epwm module or is everything self contained. I'm trying to sync a few modules and play with timing. I downloaded the 100+ pages of TI epwm reference (SPRU791F) so this will keep me busy. Any recommendations or tips regarding this module? Thanks
  3. Submitted by Joe on Fri, 04/20/2012 - 20:28 Hi I was using Up/Down count and everything was working fine. Then I switched to Up Count but I can not get the expected PWM waveforms on my oscilloscope. Anything wrong? Please help me.