Live data from Hacker News

The next generation of wall chargers

theverge.com

131–140 of 203 posts

Re: The next generation of wall chargers

#133
Ok, but they're USB-C, meaning there is an 80% chance they implement the spec incorrectly (resulting in weird issues with random devices), and a 10% chance that they are straight up unsafe. Benson is no longer updating his list AFAIK, but that's not because people have learned to do USB-C correctly; they haven't, e.g. [0]

[0]: https://medium.com/@leung.benson/how-to-design-a-proper-usb-...

Re: The next generation of wall chargers

#134
post #123

Uninformed basic question: Would these charge my phone faster than the standard ones?

Unfortunately, it depends. There are various standards that devices use to negotiate how much power to send over the USB cable. These chargers tend to support all the popular standards so they'll charge your phone at the fastest possible speed (unless you have a OnePlus or OPPO phone). If you have a midrange or higher Android phone, the included charger likely charges at max speed. If you have an iPhone with the 5W a…

Thanks!

My Pixel 4 charges at 18W, and I'm probably good as is.

Re: The next generation of wall chargers

#135

Earlier quoted context omitted.

I've got the same one, very pricey, but amazing to travel with compared to the giant macbook charger. It's only 60W but charges almost as fast as the 87W one for 15" macbooks. It's also really nice to be able to charge all my travel gadgets with one small charger, reducing the number of cables and chargers I have to carry. I'm hoping that giant power bricks and those adapters that power via barrel plugs will disappea…

> Computer monitors are most guilty of having some of the biggest power bricks, and I'd love to see them replaced with regular power cables Dell Monitors have a single power cable (for example this P2418D [1]). Many other manufacturers ship giant power bricks because it allows them to make the screen thinner, and nobody sees the power brick under the table. It comes down to customer preference. 1: https://snpi.dell.c…

I'm fine with a brick for heat dissipation, I just wish OEM bricks came with a label saying which device they're for.

Re: The next generation of wall chargers

#136

WOW... This is a horribly misleading article and discussion. The silicon of the switching circuit PALES in comparison to the real magic here. The wattage capability and size of these chargers is only possible because of US “power delivery”. These chargers are NOT hitting 30+ watts at 5V traditional USB voltage. Yes, there is another power and ground wire pair in the cable, but iirc they got smaller in diameter. These…

You can falsify your own argument by checking out the range of PD2 chargers from Anker or RavPower, observing the models with similar wattage and same multi voltages including up to 20V, and then noting the size differences.

They’re not making the new models bigger just for fun.

Re: The next generation of wall chargers

#137

Earlier quoted context omitted.

I believe the point was that GaN semiconductors make these chargers more compact, cooler, and lighter than their silicon competitors.

But that isn’t really the case. These chargers wouldn’t be pushing 30+W to device at this size if they weren’t also at 20V. One way before the other! Lock it down to 5V and the size goes way up. The comparison to Apple’s 5V and 5W from like 2008 is at best misleading. Are these smaller because of better silicon, yes, are they marginally smaller and the real difference is USB pd, also yes.

No, the real difference isn’t PD2. They have models with identical specs where size difference is not the PD but material.

Re: The next generation of wall chargers

#138

Not seeing UL or CSA approval numbers on those. That's important for switching power supplies, especially small ones. A switching power supply is always a few milliseconds from being a short circuit across the input. And FETs fail in the ON state. That's why those things are inherently fire risks and need protection circuitry. Really tiny ones make it worse; if they fail, there's not much space to dissipate heat befo…

Ugh. I ordered the four-port one they mentioned without considering it might not have UL approval. I'll be looking for the symbol when it comes now. Thanks for bringing it up.

If the thing works as advertised and is safe, it's amazingly useful. It should quickly charge absolutely every device I have except my work 2015 MacBook Pro (that I'll likely replace soon), and up to for of them at once. (Eg laptop, phone, battery pack, and wireless headphones simultaneously.) Handle US or EU input. And be very compact.

Re: The next generation of wall chargers

#139

Not seeing UL or CSA approval numbers on those. That's important for switching power supplies, especially small ones. A switching power supply is always a few milliseconds from being a short circuit across the input. And FETs fail in the ON state. That's why those things are inherently fire risks and need protection circuitry. Really tiny ones make it worse; if they fail, there's not much space to dissipate heat befo…

Aren't they also noisy AF? Wouldn't that affect power meters, or other measuring devices?

Re: The next generation of wall chargers

#140

Not seeing UL or CSA approval numbers on those. That's important for switching power supplies, especially small ones. A switching power supply is always a few milliseconds from being a short circuit across the input. And FETs fail in the ON state. That's why those things are inherently fire risks and need protection circuitry. Really tiny ones make it worse; if they fail, there's not much space to dissipate heat befo…

Gosh that's odd; Ravpower has a blog post about UL certification's importance ( https://blog.ravpower.com/2018/04/usb-charger-safety-certifi... ) but you're right, their RP-PC104 45W GaN USB-C wall charger and its manual don't list UL certification information ( https://cdn.shopify.com/s/files/1/0257/5656/5579/files/RP-PC... , https://www.ravpower.com/products/rp-pc104-45w-pd-wall-charg... ).
Post reply on HN