pwm dead band generator

PROMOD · Joined: 01 Feb 2018 Posts: 42

What is "pwm dead band generator"? Could someone please explain it?

temtronic · Posted: Tue Nov 20, 2018 7:49 am

quick reply
deadband is the time between successive PWM signals in the 'stream'
IE say the PWM signal is 1ms long, deadband could be .1 ms long.
during the .1ms 'deadband' the PWM signal will be zero or off. This allows for the controlled device (say a motor) to slow down a bit. You don't want a motor to go from full forward to full reverse ! Now HOW you calculate 'deadband' requires knowledge of the motor, load, drive train, power supply, etc.
Any PIC that has a PWM MODULE with 'deadband' option will explain some of the details. Also, check Microchip's website for 'application note'. Probably lots of information there !

Jay

Ttelmah · Joined: 11 Mar 2010 Posts: 19510

Full bridge or half bridge PWM. You have one something driving one way, then switching to driving the other. Dead band, is where you have a tiny delay between these. Provides time for the cicuitry involved to actually go 'off' before the other drive cycle starts.

MikeW · Joined: 15 Sep 2003 Posts: 184 Location: Warrington UK

@ PROMOD

I resisted replying until 2 other well respected people responded.

point 1- its nothing to do with the CCS compiler
point 2- you dont read the PIC datasheet
point 3- google would have given you loads of answer.

you are clearly lazy

Mike Walne · Joined: 19 Feb 2004 Posts: 1785 Location: Boston Spa UK

This link is just one of those thrown up on Google.

https://electronics.stackexchange.com/questions/134712/what-is-pwm-dead-band-and-when-should-i-use-it

You could have done this for yourself.

Mike

temtronic · Posted: Wed Nov 21, 2018 9:34 am

But Mike... these days, 'kids' have been spoonfed all of their life, so it's natural for them to get stuff without asking. Us 'old guys' probably still have a library FULL of real databooks and printed application notes' we use as reference materials !
It's why I tend to not directly answer 'generic' questions here, rather 'point' to a datasheet or apnote, to get the poster to READ the information. That way , hopefully, what they read, they'll remember. If not the info, then WHERE the information is.

Jay

dluu13 · Joined: 28 Sep 2018 Posts: 395 Location: Toronto, ON

I remember reading a study saying that thanks to how easy it is to find information, kids (like me) these days organize their memories based on where to find the information, rather than what the information is.