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- เผยแพร่เมื่อ 1 ต.ค. 2024
- 85-260VAC to Dual +/-15VDC-0.5A AC to DC Switching Power Supply
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This article introduces an AC-to-DC flyback switching power supply that converts universal 50Hz/60Hz AC input (85V to 260VAC) to dual-output +/-15VDC to 0.5A (2*7.5W), which can be used in various applications, such as powering dual-supply op amps, amplifiers, and waveform generators circuits.
The transformer’s ferrite core is RM8 and DK124/DK125 is the controller chip. The inductance of the transformer's primary winding is 1.13mH and the switching frequency is 65KHz. The estimated leakage inductance is 22µH and the reflected voltage (VOR) is around 110V. The controller chip does not need any external supply rail (through an auxiliary winding on the transformer) and there is no startup resistor through the HV-DC line. The AC input is protected using a glass Fuse and a Varistor. A common mode choke, small loop areas, low impedance ground plane, and an RM ferrite core ensure a low EMI level. All components are through-hole, making it easy to follow and solder even for electronic beginners.
The DK124/DK125 is a secondary side flyback type AC-DC Switch Mode Power Controlling IC. Designed with a highly integrated CMOS circuit, it has protection functions for short-circuit, secondary side open-circuit, over-temperature over-voltage, etc. It has a built-in HV power transistor and a patented self-powered supply circuit that reduces required external components and follows a simple transformer design.
![How Switch Mode Power Supply Works? Part l [tagalog with subtitles]](http://i.ytimg.com/vi/xaY7fY10Cjo/mqdefault.jpg)
85-260VAC to Dual +/-15VDC-0.5A Switching Power Supply
I have never seen a dual output supply on TH-cam, Very good design, both circuit design and layout ❤
Glad you like it!
Very good design and explanation 😊
Thanks a lot 😊
What is The Turn Number of Pri & Sec Winding?You Did not gave The Article Link
article will be published later, check back again
This is really cool! Do you have any books/references/application notes that can help a new designer in creating designs like this? Thanks again for the amazing content!
truth be told I did not learn through a single reference, I learned discreetly, and always updated myself and learned new things. I mention all the necessary tricks in the videos and articles. if you completely follow them, it's like a shortcut for you, because most people look for freebies and not something to learn, they watch 2 minutes of any content and leave, but I have subscribers that watch everything completely using hands-free. it's up to you :-)
@@MyVanitar Thanks. I've defintiely learned a lot from your content! I want to do some more power electronic and RF based designs.
Nice.
Thank you! Cheers!
That is very large for only 15 Watts. That 86C of the snubber is 60C over ambient. Other parts also have a high temperature rise. Did you plan on a simple, inexpensive thermal path for these hot parts?
it depends compare it with what, cheap online boards?! there is no SMD component, the power rating is correct and continuous (not a fake rating), and EMI/noise/safety was considered.
They don't have high-temperature rise, 50-55C is nothing. Do you have a thermal camera? check your boards for maximum current after 1 hour. if you always edit your comments, I can not reply correctly
Great work. Will this board work in 60Hz, not 50Hz?
it also works with 60Hz, not a problem, I'll edit the text
@@MyVanitar Thanks.=)