EEVblog #225 - Lab Power Supply Design Part 4 - PWM Control
Why Electrical Engineering Stack Exchange recommends it
Electronics Stack Exchange users link it when explaining how to turn a PWM signal into an analog voltage with an RC low pass filter, or as an example of PWM control in a power supply and of scope noise.
Recommended by 1 people across 1 different months, 2012 to 2015.
What it is
Part 4 of Dave Jones's EEVblog series on designing a bench lab power supply. He shows how to control the supply's output with a PWM signal and how to choose the RC filter values that turn the PWM into a smooth control voltage. The episode also includes scope probing along the way.
What people said
Recommends Rohan · 2015-12 · Electrical Engineering Stack Exchange · on “How to detect the duty cycle of a laser pointer”
@NesliKöse You can convert a PWM signal to an analogue voltage using a basic RC low pass filter. If you google PWM to analogue you'll get a lot of results. This video on the eevBlog also does a fairly good explanation of the technique. From that analogue voltage you can just use a simple opamp as a comparator! [this video]
Cites rdivilbiss · 2012-08 · Electrical Engineering Stack Exchange · on “Can I use a microcontroller to control the output voltage of a switching powersupply?”
A EEVBLOG YouTube example of PWM control of a power supply here [this video] . Actually #4 of 10. Obviously this can be accomplished in different ways.
Cites efox29 · 2014-10 · Electrical Engineering Stack Exchange · on “How to identify if noise is coming from circuit or scope?”
Occasionally, I'll be probing a circuit and would expect to see something specific and sometimes I see either crap or the signal im expecting with crap. This video from EEVBLOG is a good example of some of the things I've seen. EEVblog #225 - Lab Power Supply Design Part 4 - PWM Control [this video] I've jumped to the time that's relevant for my question. He mentions that those spikes are probably due to his probing. My question is when you probe an arbitrary circuit, and you see something that you weren't expecting, how can you determine if its coming from the scope/probing or from the circuit itself? In another video EEVblog #577 - Precision 1A Current Source Part 2 [LINK] he changed a wire to