I want to implement 2-channel PWM dead time.

RE: I want to implement 2-channel PWM dead time.

ovrebekk — Mon, 21 Dec 2020 10:45:24 GMT

Glad I could be of help, and the best of luck with your project 🙂

RE: I want to implement 2-channel PWM dead time.

schosdas — Sun, 20 Dec 2020 06:00:29 GMT

Thank you for the good information!

I will refer to it and apply it.

RE: I want to implement 2-channel PWM dead time.

ovrebekk — Fri, 18 Dec 2020 12:35:27 GMT

What would the waveform look like if you have a PWM frequency of 50kHz and a dead time of 10us?
At 50kHz a single PWM cycle is only 20us long.

The app_pwm driver will not really work for this use case, and unfortunately the PWM hardware modules don't have proper support for this use case either.

It might be that the best solution here is to do a more custom PWM implementation using a TIMER, some PPI channels and the GPIOTE module, which allows you to control pins accurately by configuring compare events at different points in time using the TIMER, and then connecting these events to pin operations through the PPI and GPIOTE.

This concept is explored in more detail in this hands on example.

Best regards
Torbjørn

RE: I want to implement 2-channel PWM dead time.

schosdas — Fri, 18 Dec 2020 02:49:58 GMT

Thank you!

I'll take a look at this and refer to it.

RE: I want to implement 2-channel PWM dead time.

schosdas — Fri, 18 Dec 2020 02:48:28 GMT

I would like to print out a frequency of 50 kHz using a 2-level PWM.

Thank you.

RE: I want to implement 2-channel PWM dead time.

ovrebekk — Thu, 17 Dec 2020 14:21:00 GMT

What are your requirements in terms of PWM frequency, and number of PWM levels (top value)?

Best regards
Torbjørn

RE: I want to implement 2-channel PWM dead time.

hmolesworth — Thu, 17 Dec 2020 05:06:33 GMT

Maybe have a butchers at this how-to-set-up-pwm-dead-time