1k Watt PFC Schematic Review Part 2

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Kiss Analog

Күн бұрын

Пікірлер: 28

@garthhowe297 2 ай бұрын

It took me a day to get to this one. I knew I would need to be awake and wearing my thinking hat. I enjoyed it.

@KissAnalog 2 ай бұрын

Thank you! I gave you an extra day - now tomorrow I post the video on the board layout. ;) Let me know what you think;)

@versace885 2 ай бұрын

Hi Eddie, I really appreciate you doing such a great informative video. Thank you so much.

@KissAnalog 2 ай бұрын

I appreciate you!

@northox 2 ай бұрын

Totally in agreement. It’s a logical representation, not a physical representation. Looking forward to see your Kicad diagrams.

@KissAnalog 2 ай бұрын

Thank you!

@deviantmultimedia9497 2 ай бұрын

14:07 Supposedly Sheng-Yang Yu designed the circuit and drew the schematic. That's why you get a real sense of his personal passion for electronics when you read the schematic. It's also for public release too so he did something extra special and took an extra 14 seconds writing in the supply voltages for us. And the 9 extra seconds he spent labelling the soft start circuit- he really didn't have to do that. But he did do that, because that's how much he cares. He considers those little things way worth it, because when he goes home at night, he wants to be able to say... "I'm glad I was able to complete the schematic in 53 seconds today. When I take over a minute I'm penalized." That's the spirit!

@KissAnalog 2 ай бұрын

I love it;)

@Hellhound604 2 ай бұрын

Hi Eddie, sorry for chipping in again…😂😂😂 glad to see I am not the onliest one freaking out about readability and just common sense with circuit diagrams. When I see some of the circuit diagrams nowadays, I just want to scream and rip my hair out!!!! For a guy doing software or digital stuff 99% of the time, I guess it might make sense, but from a person that actually wants to make sense and visualize the actual working of the circuit, it makes no sense at all… Having an important chip with a huge impact on EMI on one page, and its decoupling caps is nowhere to be found, until a couple later where all the decoupling caps are just thrown together on a single page. 😱😱😱😱 In anycase, I started off in a R&D company where neat and structured circuit diagrams were drilled into us by the wise old men with grey beards that learned on vacuum tubes, so that became an ingrained part of me, so I tried teaching the young engineers landing under me the same structure. THEN we merged with another company who had no logical structure in either their designs, circuit diagrams nor PCB-layouts. The cultural differences were too large and the ship started sinking slowly. Still sad to think of that.😢😢😢

@KissAnalog 2 ай бұрын

This feedback from a real world engineer - is fantastic!!! Right on point!! Thank you for doing your part to impart the 'ART' in design;)

@frnkbooth6871 2 ай бұрын

I’m glad I’m not the only one that has continuous issues with TI schematics. Pretty horrible if you don’t have a reference board.

@KissAnalog Ай бұрын

Thanks - I agree;)

@tristankordek 2 ай бұрын

👍

@KissAnalog 2 ай бұрын

Thanks!

@kecsrobi6854 2 ай бұрын

That Zenner diode on the relays seems wrong, also the gate drive power of the chips is strong to begin with , tho i think it is clamped to 12-13V or something , maybe they used the totem-pole to boost ti to 14V to get lower RDSON ? regarding ART i sort of prefer tons of GND symbols since i dont have to follow long lines BUT i agree with functional symbol gin placement. I sort of dont like spaghetti schematics but also hate excessive use of net labels. BTW when it comes to high voltage caps how do you settle on a array? so you guess-timate a economic value and scale that up ? like i need 600-800uF and simply use 3-4 220uF caps in parallel? or try fing something 330 or tons of 100uF ? how does the market swing these days?

@KissAnalog 2 ай бұрын

Thanks for your feedback! Yes, this chip has a pretty good driver - but driving 2 high voltage FETs can be challenging...so a totem pole driver is essentially just a boost to what is inside the chip. I think they made options so that people could try their own FETs and drive types.

@kecsrobi6854 2 ай бұрын

Yea, Btw if my next stage is llc how much regulation is really required ? Asking since I feel that I can drastically my apfc , based on what I see in reference designs.

@jedi-mic 2 ай бұрын

I was thinking could you not make a schematic in a cube shape like 3D, especially if you have multiple ground planes on the PCB, digitally it could look quite good because you can rotate the cube and have different color aspects to the cube. Have you ever seen anything like that, would it work?? also you could make it into augmented reality like that, when you seeing the circuit board on the bench and in your glasses / monitor 3D, seeing the schematic test points physically would match up in 3D in the cube or rectangle. or am I getting ahead of myself☺

@KissAnalog 2 ай бұрын

I like it;)

@sanjikaneki6226 2 ай бұрын

R115 SHOULD be 220 ohm according to datasheet , regarding the relay zener does that even help i dont think so

@KissAnalog 2 ай бұрын

Great point! I'd have to analyze the circuit and even simulate it to see if the zener is needed;)

@sanjikaneki6226 2 ай бұрын

@@KissAnalog great also noticed some minor mistakes but but problem overall.

@ronaldhofman1726 2 ай бұрын

R117 and R119 , 499 K is not a standard E value resistor , never seen that

@KissAnalog 2 ай бұрын

Thanks for your feedback. I do see 499k resistor in the standard EIA resistor tables.

@scottbrady419 2 ай бұрын

In your earlier days, I'm guessing you would have graded this a C-

@KissAnalog 2 ай бұрын

Thanks for your feedback! But, I do have to ask you what you mean?? My earlier days I would hav\e rated this an a+ and now I would rate this as an A-. Only because today - with this 1kW power - there are other ways...