Does my iPhone 11 auto detect different power inputs internationally or do I need to purchase a power converter?

No you don't need a power converter. The phone itself only takes in fairly low DC voltage - either 5V or 9V depending on what you use. It's the power adapters (and you don't have to use Apple) that are typically capable of taking in a higher AC voltage and then converting it to the required DC. Or even a typical 12V lighter power adapter that just converts from 12V DC to a lower DC voltage.

Here's an Apple power adapter label. The input is 100-240V AC, but can be used almost anywhere in the world as long as the blades are connected electrically to the power source.

It might require a passive adapter, and that can look pretty awkward sometimes. Some of Apple's power adapters use their modular plug system where there are various plug attachments. Apple sells their "World Travel Adapter Kit" with all of their attachments. The package shows 5 plugs, but the box contains 7.

Apple World Travel Adapter Kit - Apple

Here are some passive adapters designed to work with a US style two-bladed plug. Imagine one of these hanging from a wall outlet and then the power adapter at the end. They often hang rather awkwardly.

kimdenisep wrote:

y_p_w - thank you for taking the time to give me a very thorough and extremely helpful response! I was getting conflicting information, so came here to ask the question....your response is very much appreciated. Kim

The big thing if you're connected to AC will be the power adapter. That's almost universally going to be able to take any worldwide "mains" power safely. I haven't seen a single USB-A or USB-C power adapter that doesn't accept worldwide power, but as I noted the big thing is whether or not the plug fits in the outlet. And if it doesn't, there are those passive adapters I mentioned, which complete the electrical connection. But on a wall they can sometimes sag compared to plugging directly, like this. It's not so bad if you can find a power strip and it's on the ground.

USB-C complicates things though, but as long as you use proper spec Apple certified cables and spec-compliant power adapters, you should be fine.

There are some weird ones in the world, such as in China, where they typically have two different style outlets, but also 220V AC in both. One is compatible with US two-bladed plugs, and I've used Apple power adapters there.

You need not buy a converter. You may need an adapter to suit your country's power socket configuration.

I'll just say that a power adapter shouldn't become damaged from using overseas with just a plug converter. I have a lot of different power adapters, AA battery chargers, notebook computer power supplies, etc,, and they list on the label that they're 100-240V capable, and sometimes even up to 250V. I have a few older "wall wart" power converters though that don't, but I don't really use them any more. They're so ubiquitous that I'm not sure why any would fail.

I have had experiences with poorly made power adapters. However, if you're sure that you have Apple OEM or a quality third party one, I wouldn't worry about it.

I'm not sure about that power strip - or should I say power donut. Looks like a unique shape. I'm not sure exactly what it does, but if I were to guess, it simply passes on the AC power to the three-prong outlets, but the USB ports are like a universal converter where it takes 100-240V and converts that to 5V DC. The labels indicates that it should work when plugged into the typical 230V that is used in Scotland. You'll need a three-prong converter. Most of the UK converters I've seen are two-prong (with a combo blade/pin) outlet even though the UK uses a grounded plug. There are some odd-looking universal converters although I'm sure that there's something out there with a specific UK 3-prong plug and US 3-prong receptacle. But something like this should work, even though it looks really convoluted. I found this one for sale on Amazon.

The important thing when using a higher voltage source input into that strip would be to not plug in anything that is only designed for 110-120V US power. If you make a mistake, you'll probably know by the smell of melting electronics.

That should be fine. I'm sure whatever battery charger for your camera battery is 100-240V. The only thing about the shape out that power strip is that it might not accommodate really wide devices at the same time.