Skip to main content

Understand DC Fast Charging Technology and Standards

3:12
9:46
15.9K views

At 3:12 in

I PUT THE WORLD’S FIRST DC FAST CHARGER IN A HOME! | DAY IN THE LIFE OF AN ELECTRICIAN FAMILY

What happens here

The presenter explains the internal workings of the portable DC fast charger, noting that it contains rectifiers (MOSFETs or diodes) that convert the incoming AC power (sine wave) into DC power. It's clarified that this unit outputs around 400 volts DC, bypassing the vehicle's onboard AC charger. The discussion then shifts to different charging standards: J1772 for standard AC charging, and CCS (which incorporates J1772 for control signals but uses separate pins for DC) and NACS (Tesla's North American Charging Standard, which is also AC/DC compatible).

Goal: Learn how AC power is converted to DC for fast charging and differentiate between EV charging standards.

Tools and materials

  • Standard AC Charger — Comparison and explanation of connector types

What they say

Hide

to 8:00 8:30. So this is the original 50 amp. That's insane. It is insane. What a lifesaver. It is. Well, because we have a little fleet and we need this. Yeah. You know, you got to get going you got to get going. So And how about this guy? Is he charged up? Yeah, this guy is full charged. 129 mile range. >> that's Ken's van, right? >> Yeah. So his tools are all in there. Yeah. If you can't wait, you're going to have to take that van and we'll let your van charge up. Yeah. Awesome. If you have a lightning or anything that's CCS Yeah. Cuz this is doing DC fast charging, not AC, right? >> And how does it really convert like from AC to DC? Is there like something in here that converts it? Yeah, rectifiers. Rectifiers? >> takes the AC sine wave All right. right? Yeah. And then it goes into um like MOSFETs or diodes >> Okay. >> that only allow current to travel either positive or negative, right? >> Yeah. So if they put a diode in line of that sine wave when if they put it in positive bias, so then when the sine wave is up it's conducting. So they do it negative biased so that when the sine wave is negative, it's conducting. But they put those together so you have the positive and the negative. I mean, it's more a little more involved than that, but that's basically what it's doing. It's just conducting. It's allowing the current to conduct Mhm. based on the position of the wave and the configuration of the diode. And there's normally four diodes to make a a individual power supply. Wow. And some capacitors and all that, but And that's what That's what this is doing. That is incredible. But in addition to that, it's also using um MOSFETs to step the voltage up because this is actually putting out almost 400 volts right now. It's putting out volts? Yep. 400 volts DC. So normally when you plug into a regular charger like this charger >> Level two? it's AC going in, right? So it's up to 50 um up to 50 amps, let's say. >> Yeah. Uh AC going into your vehicle. Now your vehicle has a built-in charger. So the vehicle kind of is doing a little bit of what this guy is doing. >> Mhm. But that's losing efficiency. That's why DC fast charging is so much quicker cuz you're bypassing the charging feature. Got it. >> Right? >> Yeah. >> You're just putting right to the mains. That makes sense. All right, so we were at 48% when we first started. We had a little discussion here. Yeah. And now we're at…

Auto-generated from the video audio.