How PWM and Duty Cycle Works

How PWM and Duty Cycle Works...
www.autodiagnosticsandpublishi...
PWM is used throughout the automotive industry as a command signal. It is meant to make automotive components work less, when the demands are not as heavy. And, we created the PWM Bi Directional controller to help you test and diagnose all solenoids, motors and actuator components.
PWM, or pulse width modulation, is the ability to control a load or component, by pulsing its electrical current. In this way, the load or component can be made to change its speed, without any heat causing parts, like resistors. So, if PWM is using pulses to control a load, then Duty Cycle is the measurement of these pulses.
The Duty Cycle of a PWM signal, tells us the amount of work this signal is supposed to make the component perform. The duty cycle of the signal is always described in percentage. So, a 10% duty cycle means, that the component is on 10% of the time. And a 90% duty cycle means the component is on 90% or most of the time.
Now, there is a close relationship between duty cycle, and how the component is triggered or turned on, which could be by applying power or ground. This relationship is very important, so remember that thoroughly. Here is what we mean by that. Suppose a solenoid is activated by ground. That means, that 12 volts or battery voltage is applied steadily on one side, mostly through a relay, and the other side receives a PWM ground command signal. Now imagine that a 10% duty cycle PWM signal is applied. What we then have is to measure is how long the signal is grounded. And, how long as compared to the entire cycle. A 10% PWM duty cycle means that the solenoid receives a ground only 10% of the time, and receives power 90% of the time. Since we have already mentioned that this is a ground controlled solenoid, the time the drive transistor provides power means that component is off. Why? because you already have steady power on one side, so power on the other side equals no operation.
If, on the other hand, the component is turned on by power, meaning ground is steadily applied on one wire, and power is pulsed, that same mentioned signal, will then become a 90% duty cycle signal. Now with this power actuated component, the positive or 12 volt side is what matters, and what is taken as the duty cycle. It is worth mentioning that most components are triggered or actuated by ground. Why? It is because if that command signal is shorted to chassis ground, the component will simply turn on all the time, like a 100% cycle. If it were power triggered, then there would be a short, and the fuse would blow rendering the system useless. But still, some components are power triggered, and be prepared to understand the nature of PWM to Duty Cycle. Hopefully what you have learned here will give you some insight on using the PWM Bi Directional Controller to perform your diagnostics.

[@ThePippi301]

thanks for the useful teaching

[@omaradan8062]

Thanks that's observe great post video I like

[@sparkden]

super training! its a pity we are on the other side of the globe

[@trainman1209]

Love these videos. Very dignified.

[@ADPTraining]

+Steven Bull PWM Bi Directional Controller... www.autodiagnosticsandpublishing.com/pulse_width_pwm_controller_driver.html

[@seannot-telling9806]

+Steven Bull I must agree. Well done and an easy way for
people that don't understand PWM to get an idea
on just how it works.

[@ADPTraining]

+Sean M Thanks guys, most appreciated... Mandy.

[@jesusmalagon4336]

thanks

[@ADPTraining]

See the PWM Bi Directional Controller

[@ADPTraining]

+ADPTraining www.createspace.com/pub/simplesitesearch.search.do?sitesearch_query=make+your+own+diagnostic+mandy+concepcion&sitesearch_type=STORE

[@SelfatronAudio]

Good..
Mr. Can do you tell me.. this about..
I have a module switching for smps..
Drifer from ic uc3843. How to work for adjust voltage secunder. What is IC working adjust frequensi or duty-cycle. Thanks..

[@ADPTraining]

Don't inow

[@demontagemontage]

شكرا اخي

[@tnamen1307]

Sir, what is PWM idle control valve??
My car i20 1.2 petrol has 3 pins connector to its idle air control valve. Pin 2 gives 12.6 v when grounded. However, pin 1 and 3 gives only about 10.5 V when measure with respect to positive post of battery. Why I'm not getting 12.6 V???
Also, very surprising is that, when pin 1 and 3 are grounded individually, they still give about 1.5 volt. Is there something current nor voltage leaks??? Our main issue is pin 1 and 3.
Please find me solutions!! Thanks.

[@ADPTraining]

See my site

[@clickle23]

The guy should FIRST explain or quote the difference between the HIGH side drive and LO side drive, the latter uses a PNP transistor w.r.t. the power bus. So the output is in reverse and this is why if its BASE is shorted to chassis ground, it is turned on ALL THE TIME.

[@ADPTraining]

+Eric Sun If you need more on this series, here's the Book/DVD links... www.createspace.com/pub/simplesitesearch.search.do?sitesearch_query=make+your+own+diagnostic+mandy+concepcion&sitesearch_type=STORE

[@wojuthegreat8015]

I spent last 20 min trying to figure this out... Thanks!

[@rdvishwa]

does this use QPWM D ?

[@ADPTraining]

+evoL0VE It's a PWM Controller used to test almost any actuator controller, as in cooling fan motors, solenoids, transmission pressure sol and shift solenoids, AC compressor hydraulic valves or any fluid valve for that matter. We have something different for injector, as injectors run differently. Hope that helps.

[@ADPTraining]

+ADPTraining www.autodiagnosticsandpublishing.com/pulse_width_pwm_controller_driver.html

[@user-vj5wd6wq1v]

What does synchronous PWM mean

[@ADPTraining]

See my site

[@jamesbarratt593]

Voice equals info does not get retained 90 percent of the time.

[@ADPTraining]

Ok

[@thekhang5098]

Can i check it by DC volgt like 100% duty

[@ADPTraining]

No

[@gerrys6265]

Lets cut the computer voice. Surely there are still humans in the world?