Inserting delay before synchronized pwm signal

nitin29 · ‎2016-08-18

Posted on August 18, 2016 at 12:01

Hi All,

I have two signal, one high signal having 20% duty cycle and a low signal with 40% duty cycle. High signal is synchronized to low signal with reset trigger. I want to insert a delay of 100-400ns (t2 in diagram) before high signal so it looks like as in attached diagram. I tried to synchronized complementery pwm with dead time insertion but no success.

How can I insert such a delay? please let me know.

Thanks!

#stm32-pwm-timers #delay

Walid FTITI_O · ‎2016-08-22

Posted on August 22, 2016 at 18:21

Hi kumar.nitin.002,

Yes, you should insert a dead-time on complementary output signals OCx and OCxN of the same timer TIMx .

There is no synchnoization to be done here. Just apply the same code of the ''TIM_complymebtarySignals'' example on the

http://www.st.com/content/st_com/en/products/embedded-software/mcus-embedded-software/stm32-embedded-software/stm32cube-embedded-software/stm32cubef3.html

at this path:

STM32Cube_FW_F3_V1.6.0\Projects\STM32F3-Discovery\Examples\TIM\TIM_ComplementarySignals

You will have the OCx as the low signal (falling) and the complimentary high ignal (rising) with a delay. (in the example delay is : 100/SystemCoreClock (around 1.4us) )

-Hannibal-