MODULATION NEAR 0%-100% DUTY IN TRIANGLE WAVE COMPLEMENTARY PWM WITH AUTOMATIC DEAD TIME

MODULATION NEAR 0%-100% DUTY IN TRIANGLE WAVE COMPLEMENTARY PWM: in the old Renesas micro SH7044
I need to replace when one output is at 0% and the complementary output have (2*dead_time) off time,
is also possible to linear modulate this off time until 0. I can not find this possibility in Synergy!
is It possibile that is feature has been lost? does this possibility exist in Synergy?

  • Hi drivetech-
    I'm looking to see how this could be supported. Can you point to the feature/configuration used in the SH7044 (Hardware User manual reference perhaps) so I can try and find the same one for Synergy?

    Warren
  • In reply to WarrenM:

    Thanks Warren! In the SH7044 the complementary PWM mode is described in the hardware manual in chapter 12.4.9 at page 343. It is made by working toghether channels 3 and 4 with the TCNTS counter and in register TDDR you can put an automatic dead time.
    The Synergy GPT timers automatic dead time works in a different way, the compare register GTCCRB is automatically set to GTCCRA-GTTVD or GTCCRA-GTTVU theoretically it could work but seems to be an hardware block to avoid the dead time modulation at the end of the duty. this causes a loss of the output voltage which in my case is 6.4% from the SH7044
  • In reply to drivetech:

    Hi,

    Does the information in the following forum post assist you with your problem?

    renesasrulz.com/.../s5d9-pwm-deadtime

    Regards,

    Ian.