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Original question:

CCS/TMS320F28377D: PWM Deadband

CCS/TMS320F280049: Dead band insertion

Vineeth N
Expert 1180 points
Part Number: TMS320F280049

Tool/software: Code Composer Studio

Hi Team,

For a specific converter application I need complimentary pwm signals ePWM1B compliment to ePWM1A. Also I need to insert 1 micro second delay on either side of ePWM1B, while keeping ePWM1A as it is. Is it possible to do so? 

Can I use dead band module for this purpose?

Thank you,

Vineeth

  • 0
    Guru 14640 points

    One really good video:  https://training.ti.com/getting-started-c2000-epwm-module

    About 8 minutes into the video is treatment of deadband.

    Hopefully, that helps.

  • 0
    TI__Genius 10845 points

    Hi,

    Vineeth N said:
    Can I use dead band module for this purpose

    Yes, deadband module can be used for this.

    Thanks
    Vasudha

  • 0 in reply to Todd Anderson78572
    Expert 1180 points

    Hi Todd,

    Thank you for your response. The video was helpful. 

    Regards,

    Vineeth

  • 0 in reply to Vasudha Bhadoria
    Expert 1180 points

    Hi Vasudha,

    Thanks for your response. While going through dead band module section I found active high complimentary PWM. I think AHC will serve my purpose, But I have a doubt regarding the same.

    Is it like that in AHC, ePWMB is derived from ePWMA, so that we can control only ePWMA?

    If I am using rising edge delay, the rising edge of ePWMA is delayed. If I am using falling edge delay again the the rising edge of the complimentary wave form is delayed so that I can create delay on both sides of the pulse. Am I understanding this correctly?

    Thank you,

    Vineeth

  • 0 in reply to Vineeth N
    TI__Genius 10845 points

    Hi,

    Is it like that in AHC, ePWMB is derived from ePWMA, so that we can control only ePWMA?

    The input for output outB signal from deadband module can be selected through S5 (DBCTL[IN_MODE]). This can either be ePWMA or ePWMB signal.

    If I am using rising edge delay, the rising edge of ePWMA is delayed. If I am using falling edge delay again the the rising edge of the complimentary wave form is delayed so that I can create delay on both sides of the pulse. Am I understanding this correctly?

    Yes, this is correct. The falling edge delay(FED) will also delay the rising edge of the signal as in AHC mode, signal is inverted in outB path.

    Thanks
    Vasudha