What is a Fly-buck Converter?
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- Опубликовано: 11 июл 2024
- If you combine our recent exploration of Flyback converters with our frequent conversations on Buck converters, you end up with a very unique power converter topology. Tech Consultant Zach Peterson explores this "Fly-buck" converter, focusing on how it works, its advantages, and how to set up its grounding strategy if you need galvanic isolation.
0:00 Intro
0:41 Reviewing Flyback Converters and Buck Converters
6:03 A Third Rail?
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Thank you, Dr. Peterson.
Brilliant, thank you.
My first thought for this is that it would be good for a hybrid triode/Class D amplifier, for those who want that "sweet, sweet triode distortion" that we still haven't been able to replicate with solid state components. 6V6 for the triode filaments and Class D amplifier; 40 turns ratio transformer for decent triode plate supply, Bob's your uncle.
Please do a deep dive in HV non isolated buck. Like a mains level input to non isolated, non inverting 3.3V or 5V output for devices within few watts running a MCU, small sensor, etc.
There are dedicated chips but some people have used a flyback converter chip for this.
Ok I can put something together about it, this is a good question but I would bring up the fact that people use isolated converters when connecting to mains or high voltage because of safety, not necessarily because the design must be isolated in order to work correctly. This is especially the case when the input is AC because the AC input will be unregulated, so it can be very dangerous if there was ever a fault in a non-isolated buck converter. Either a short between mains and output would destroy the load or it would injure the user.
Great video, thank you! How about connecting the secondary voltage output to the primary ground, then the secondary ground becomes inverted, with a 1:1 transformer you would get a dual rail output for the price of one buck controller say for powering opamps
Very interesting idea, it sounds like a quick way to build an inverting power supply, kind of like a flyback with a center tap?
@Zachariah Peterson indeed, very quick and useful circuit but not exactly like a center tapped flyback since the ground is not a virtual one. I first came across the circuit in the application examples for the LT1616 stepdown regulator. Last page shows a bipolar output dcdc converter and having used it with different controllers, it's now my go to power supply circuit for my analog designs! What do you think ?
@@YoussefEl. Would you mind sending it over to me and I can take a look? You can find me on LinkedIn and send me a direct message. I could also look at it for our upcoming 1 Minute Design Reviews series that we are doing for RUclips shorts and TikTok.
I wonder how the loading affect each other's outputs due to the current passing thru the transfomer affecting the mutual magnetics
Sounds like a great simulation topic if you ask me, I think this would be easy enough to do in SPICE.