astronomy

Universal Power Adapter for Mobile Devices

Universal Power Adapter for Mobile Devices is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Universal Power Adapter for Mobile Devices rather than just read about it. In short: The Universal Power Adapter for Mobile Devices (UPAMD), codename IEEE 1823-2015 (before approval P1823), is an IEEE standard for power supply design intended to cater to the power range of 10–130 W (optionally 240 W) for mobile devices like laptop computers. The power supply was required to have an output capacitive energy of less than 15.1 µJ and an inductive energy at disconnect of less than 5.3 µJ.

Key takeaways

Universal Power Adapter for Mobile Devices belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Universal Power Adapter for Mobile Devices to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Universal Power Adapter for Mobile Devices from memory before moving on to harder problems.

Reference excerpt

The Universal Power Adapter for Mobile Devices (UPAMD), codename IEEE 1823-2015 (before approval P1823), is an IEEE standard for power supply design intended to cater to the power range of 10–130 W (optionally 240 W) for mobile devices like laptop computers. The power supply was required to have an output capacitive energy of less than 15.1 µJ and an inductive energy at disconnect of less than 5.3 µJ. The standard defines an AC adapter to power devices requiring from 10 W to 130 W (~20 V × 6.5 A) or (extended voltage option) up to 240 W (60 V × 4 A). A new connector (that does not mate with any previously existing connector) is proposed for a lifetime of about ten years with multiple brands and models. This minimum life of adapter was hoped to reduce electronic waste. A common direct current power plug is intended to make life easier by eliminating the confusion regarding what voltage and current transformer one needs to buy and carry. This can help mobile devices, laptops, many consumer electronic devices, office devices like Ethernet switches/hubs, and wireless routers to use the same power adapter around the world. This specification defines a communication channel between device and adapter, to negotiate the requirements and supply.

Usage There seem to be no known examples of commercial deployments of UPAMD in end-user devices. When asked about deployment in 2019, the chair for IEEE 1823 working group wrote the following:

Currently the IT market which 1823 standard was originally intended had been swayed by USB SIG to use type C connector as alternatives. However, EU standard body had made inquiry to see if 1823 should be considered as the preferred connector for the next generation of mobile devices. Also, there are new interests from some automotive industry players that are looking at distributing DC bus inside a car (obvious that 1823 with CAN Bus as control method is preferred than USB type C which was not designed for harsh environment). As for commercial deployment, unfortunately I don’t have a definite answer for you. Several power supply vendor in Asia had made prototypes about 2 years ago but I did not get any further updates after that.

History The Standards Association of the Institute of Electrical and Electronics Engineers (IEEE) approved the Universal Power Adapter for Mobile Devices working group on June 17, 2010. The project was sponsored by the Microprocessor Standards Committee of the IEEE Computer Society. On 15 May 2015 the standard was published as IEEE Std 1823-2015.

See also USB Power Delivery Rev. 3.1 - includes Standard Power Range (SPR) mode with up to 100 W of power (20 V @ 5 A) and Extended Power Range (EPR) mode with up to 240 W of power (48 V @ 5 A) IEC 62700 "IEC Technical Specification 62700: DC Power supply for notebook computer" Common external power supply for smartphones (EN 62684:2010 / IEC 62684:2011)

References

External links IEEE 1823-2015 - IEEE Standard for Universal Power Adapter for Mobile Devices - IEEE

Worked examples

Example 1 — a first encounter with Universal Power Adapter for Mobile Devices

Start with the simplest possible case. Write down what Universal Power Adapter for Mobile Devices claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Universal Power Adapter for Mobile Devices before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Universal Power Adapter for Mobile Devices ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Universal Power Adapter for Mobile Devices

In research: Universal Power Adapter for Mobile Devices appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Universal Power Adapter for Mobile Devices in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Universal Power Adapter for Mobile Devices is common in secondary-school and first-year university syllabi. It links to neighbouring topics Battery charging, DC power connectors, IEEE standards, so understanding it makes those chapters shorter.
In everyday life: Look for Universal Power Adapter for Mobile Devices outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Universal Power Adapter for Mobile Devices in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Universal Power Adapter for Mobile Devices means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Universal Power Adapter for Mobile Devices out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Universal Power Adapter for Mobile Devices in simple terms?

Why does Universal Power Adapter for Mobile Devices matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Universal Power Adapter for Mobile Devices?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Universal Power Adapter for Mobile Devices.