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INVERTED PWM

Thiyagarajan . S
Expert 2570 points
Other Parts Discussed in Thread: CONTROLSUITE

hi, 

     i have generated the sinepwm for 3 phase inverter using Event Manager A ,see the spec at below:

pwm1 - 0 phase shift - 50 hz sine pwm

pwm2 - 0 phase shift - 50 hz inverted sine pwm with respect to pwm1.

pwm3 - 120 phase shift with respect to pwm1 - 50 hz sine pwm

pwm4 - 120 phase shift with respect to pwm1 - 50 hz inverted sine pwm with respect to pwm3.

pwm5 - 240 phase shift with respect to pwm1 - 50 hz sine pwm

pwm6 - 240 phase shift with respect to pwm1 - 50 hz inverted sine pwm with respect to pwm5.

successfully i have generated this, but (coming to the testing point) my doubt is when am connecting the CRO PROBE positive terminal to any pwm pin and ground terminal to ground am getting signal properly.,  the same when am connecting the CRO PROBE ground terminal to any pwm pin and positive terminal to ground am not getting the inverted signal., so, WHAT I HAVE TO DO , TO GET SUCH INVERTED SIGNAL , IS THEIR ANY REGISTER SETUP OR HARDWARE CIRCUIT TO SOLVE MY PROBLEM ??????????/ PLEASE HELP SOON......, AM NEW TO PWM  

  • 0
    Expert 2570 points

    hi,

      i have checked one more testing, just i generated the high low pulse in normal gpio, and i connect a single led , it corrctly doing the on and off work, now am checking the wave in CRO probe positive terminal to before led and ground terminal to ground AT that particular gpio here am gettting wave,  the same gpio when am connecting cro probe ground terminal to before led and positve terminal to board ground, here i cant able to see the inverted (negative pulse) wave........., please tell me where am doing mistake, is their any thing i want to do in processor setup ?., soon  help me please

  • 0 in reply to Thiyagarajan . S
    Mastermind 7585 points

    If I understand you question right, then you try to get a negative pulse just by exchanging the oscilloscopes ground connector and the measurement probe? Is that correct? If yes, the I'd recomment to take some basic lessons on electrical engineering. Oscilloscopes and (all other power socket based units) do have also a PE (PE stands for "protective earth"). If you try to connect your oscilloscopes GND to lets say a PWM output signal, than you short this PWM with PE.  If you are lucky, the PWM survives this stress. If not, you have to buy a new device.

    To generate a complementary pair of PWM signals is explained in a lot of getting started examples, such as in controlSuite. Or use the examples in chapter 7 of the C2000 CD-ROM (http://www.ti.com/general/docs/gencontent.tsp?contentId=76594).

     

     

     

     

  • 0 in reply to Frank Bormann
    Expert 2570 points

    hi Frank Bormann,

        ya, i have studied about that PE., but yet my problem was not solved. and i verified that link also . already i have that Teaching rom for c2000 with that help only i have generated the pwm... ok without considering this issue shall i feed my pwm to 3 phase inverter circuit.., it will damage anything ??

  • 0 in reply to Thiyagarajan . S
    Expert 2195 points
    now you are cleared........ or required help.