How do PWMs work? A theoretical and practical overview
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- Опубликовано: 4 июн 2024
- We have referenced Pulse Width Modulation or PWMs multiple times in many of our tutorials but in this one, we decide to actually explain what it is. We go through the different aspects of pulse width modulation such as duty cycle, frequency, cycle period, and pulse height, while also discussing the various ways that PWMs can be used. After that, we show what a Pulse Width Modulated signal looks like on an oscilloscope using a frequency generator and how it varies with different frequencies and duty cycles.
This video tutorial is actually loosely based on one of our EEFAQs on CircuitBread, go check out the written portion that Jayesh did here: www.circuitbread.com/ee-faq/w...
0:00 Introduction
0:52 Conceptual overview and introduction of terms
2:42 Usages of PWMs
4:30 Frequency considerations
6:38 Practical view of a PWM
9:14 Overview and summary
11:50 The toast will never pop up
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got me interested in electrical engineering! thumbs up for me
As always, great video on important topics for even an RF engineer like me!
Thanks!
Video came as I’m reviewing the topic, making circuits using square waves… perfect coincidence perfect lesson
Awesome timing! Glad to hear it helped.
Thank you for your great educational videos...i have a question please : why for this square wave we are using average value and not RMS value ? .
Thank you in advance
I noticed that as you increased the frequency, the average voltage also got closer to 1V. Went from 1.15V to 1.05V when we increased frequency from 1kHz to 3kHz which would further confirm that duty cycle is a function of averaging
Theoretically, no, the frequency shouldn't affect the averaging. However, in reality, due to imperfections in the waveform generator, there is an affect as the frequency changes.
Thank you. Would you consider making a playlist that would guide someone through setting up a photovoltaic system and or a Archimedes’ screw Hydro generator?
Yes, actually. I did the PV system on my own house and am planning on showing some other people in the small town I live in how to do it (or at least help them in the process). Having done it once, now I feel I could do a slightly better job of documenting the experience while working with someone else. The hydro generator... not so much, just as I basically live in the high desert where we need irrigation for our crops to grow. Not much free water just flowing around.
please make an inverter. Teach us
Are you talking about creating an inverter at the CMOS level? Using an NMOS and PMOS transistor? I could do that, it's pretty straightforward, actually.
Pwm is great for many reason. But using it on oled is torchere for your eyes
Done poorly, I totally agree! And for actual lighting, I don't really like it in general, I think I'm getting more sensitive to it. But for dimming status LEDs or smaller projects like that, it is incredibly convenient.