The Ultimate Guide to Wireless Charging
When wireless charging first hit mainstream devices around 2012, the media hype was huge. Tech writers promised readers they'd be able to throw out their collections of mismatched cables and adapters. To charge, you'd plop your phone on a table, bowl, or desk as you walked by—like magic.
Although there were still a few kinks to work out, wireless charging technology continued to advance. Today, it's safe to say that convenient and efficient wireless charging has arrived—and it just keeps getting better.
Was the initial hype surrounding the technology warranted? As more consumers discover the ease and simplicity of wireless charging, it looks like the answer is yes.
History of wireless inductive charging
The desire to go wireless isn't new. People have been trying to transmit power without wires as long as there have been practical applications for it.
Here's a brief timeline of the early years of wireless power transmission:
Despite this progress, significant barriers to efficient wireless transmission remained. With few practical applications to be found, the technology crawled forward over the next 100 years. But the mobile device boom at the beginning of the 21st Century created a big incentive for researchers to revisit wireless charging.
This massive new market for wireless charging spurred progress, but it also created conflict—and headaches for consumers. For several years starting in 2006, different wireless charging standards competed for dominance.
These included the Powermat standard (adopted by heavy hitters like General Motors, Starbucks, and Delta Airlines) and the Wireless Power Consortium's (WPC's) Qi standard (first backed by tech powerhouses like Samsung, Google, and Verizon).
During this period, wireless charging fell short of its promise to make mobile devices easier to use. Most smartphone brands supported only one wireless charging standard (with the notable exception of Samsung). This often left consumers unable to use wireless charging stations without an adaptive case for their device.
By 2018, the Qi standard had won out. Apple's iPhone 8 family was the first generation of Apple phones to support wireless charging, and the rest is history. Powermat's entry into the WPC and the widespread adoption of the Qi standard ended the wireless charging wars.
Finally, wireless charging became practical thanks to everyone following a single standard.
Today, almost every wireless charger uses Qi, and most mobile devices support Qi wireless charging. The glass backs found on many new smartphones reflect the enormous demand for wireless charging (metal backs interfere with charging efficiency).
In the future, we can expect wireless charging to move well beyond smartphones. Before long, laptops, kitchen appliances, and even electric cars may all be capable of wireless charging.
"Today, almost every wireless charger uses Qi, and most mobile devices support Qi wireless charging."
How does wireless charging work?
Wireless charging works off the principle of electromagnetic induction. It's the same principle behind those induction stoves that have been around for years.
Both the charger and the receiving device contain wireless charging coils. The transmitting coil is located in the charging pad. The receiving coil is situated at the back of the phone and connected to the battery.
The transmitting coil converts electricity and emits an alternating electromagnetic field. When the receiving coil is within this field, it turns the energy into an electric current that is sent to the battery.
The evolution of Qi
The Qi standard (pronounced "chee") is named after the Chinese concept of the flow of vital energy through every living thing.
Set by the WPC, the Qi standard defines various power specifications that correspond to how much energy flows between charger and device. Qi also includes a data transfer spec which lets the device request the optimal amount of power from the wireless charger.
The Baseline Power Profile (BPP) specification supports up to 5 W of power output. The Extended Power Profile (EPP) specification supports up to 15 W. Both BPP and EPP are used to charge mobile devices, but EPP is more advanced thanks to its fast-charging support. For a more in-depth explainer, check out our blog article.
The Qi standard also includes a Medium power spec that currently delivers 30-65 W (it's expected to eventually support up to 200 W). This spec is used for larger devices like kitchen appliances, robotic vacuum cleaners, power tools, and drones.
Fast-charging with Qi
The difference between BPP and EPP may seem technical, but it has a significant impact on your wireless charging experience. All wireless charging products for mobile devices use either BPP (5 W maximum) or EPP (15 W maximum), and you might think that since EPP chargers can output more power, buying an EPP charger will automatically lead to faster charging. But that's not necessarily the case.
Your mobile device's ability to receive power is the limiting factor when it comes to charging speed. Your device must be able to receive 7 W of power to be capable of fast wireless charging, no matter what kind of charger you use.
Your phone's ability to receive power output is predetermined by the manufacturer. Here are the specs for a few major brands:
- Apple: 7.5 W
- Sony: 11 W
- LG: 10 W
- Google: 12 W*
- Samsung: 9 W**
*12 W charging for Pixel 5 devices
** Samsung requires that wireless chargers pass the additional Samsung Proprietary Power Delivery Extension (PPDE) certification in order to deliver power above 5 W. EPP chargers not certified under this extension will only charge at BPP wattage when used with Samsung phones. Read more about Samsung phones which support Qi wireless charging.
"Your device must be able to receive 7 W of power to be capable of fast wireless charging, no matter what kind of charger you use."
Even if your phone and charger both support fast wireless charging, choosing the wrong accessories can still slow you down. Both your cable and wall adapter must be able to receive enough power to be capable of fast charging. For example, if you own a 10 W charging pad plugged into a 5 W wall charger, your device will only charge at 5 W so you won't get the benefits of fast charging.
Make sure your device, cable, and wall charger all support enough power to enable fast wireless charging. Here's an example of a setup that will work:
- USB-C Wall Charger (10 W)
- USB-C to USB-C cable
- Charging pad (10 W)
What are the key advantages of wireless charging?
Less clutter
The main benefit of wireless charging is right there in the name—wireless. Wireless charging cuts down on clutter from charging cables. The only cable you'll need is the charging pad's power cable.
Easier charging
Wireless charging also eliminates the need to plug a cable into your phone. Ever plugged your phone in and discovered hours later that the cable connection wasn't secure—and your phone is still dead? Wireless charging eliminates that problem. Just place your phone on your charging pad, and it'll start charging right away.
Longer device life
No repeated cable plugging and pulling means less wear and tear on your phone's charging port. Since the charging port is a common point of failure for mobile devices, your phone may even last longer.
No cable compatibility issues
No charging cables also means you can say goodbye to that timeless problem among tech enthusiasts—mismatched connectors. No need to worry about not having a Lightning, USB-C, or Micro USB cable on hand anymore. All Qi devices work on all Qi charging pads.
Less e-waste
The benefits of reducing e-clutter go far beyond your personal tidiness. The current lack of a common wired charging standard leads to an enormous amount of unnecessary e-waste. The widespread adoption of wireless charging could help solve this problem.
Currently, most Android devices use USB-C ports, while Apple devices use the Lightning connector exclusively. That means that to switch from Android to Apple or vice versa, you need to get new charging cables (and maybe new adapters). Unfortunately, your old cables and adapters are very likely to end up in a landfill.
Charging cables may be small, but the e-waste problem isn't.
In January 2020, the European Parliament voted for new regulations to establish a universal charging standard for phone manufacturers in the European Union. The EU claims that agreeing on a shared charger standard will put an end to charger clutter and 50 million metric tonnes of e-waste annually (16.6 kg per inhabitant).
Wireless charging is ahead of the game when it comes to reducing e-waste. Qi wireless charging has already achieved a universal charging standard. Apple, Android, and Google all support the Qi standard, making it the most reliable charging standard today.
Safer charging products
As more users adopt wireless charging, additional benefits of standardized chargers will become clear. The quality of charging products on the market should go up, with fewer counterfeit chargers being sold. That will guarantee a higher level of safety for users worldwide.
6 myths about wireless charging
Despite its advancements, there are still many people with concerns about wireless charging. Most of these worries are holdovers from the old days of wireless charging when the standards weren't quite as refined.
Here are some of the most common myths and misconceptions busted.
1. Wireless charging is slow
This misconception may date back to wireless charging's 5 W days. It definitely was slow back then. But today's fast wireless charging pads can provide 10 or even 15 W of power, which is as fast or even faster than wired charging.
2. Wireless charging is inefficient
The conversion from electric current to electromagnetic field and back doesn't cause significant efficiency losses. You can recover as much as 80% of the input wattage when charging wirelessly, but make sure your wireless charger features an efficient coil design. Cheap uncertified wireless chargers tend to use inferior materials and components which can affect efficiency.
3. Wireless charging is dangerous
Some people think the energy transmitted wirelessly could be hazardous to your body. However, magnetic induction only works across very short distances. At a distance of only 4 cm, you're totally safe from any potential effects of the radiation, and charging pads do not emit electromagnetic radiation constantly. Qi-certified chargers won't produce a magnetic charging field unless a phone is on the pad.
4. Wireless charging can overheat your phone's battery
All charging (both wired and wireless) generates some heat, but solid electrical engineering can keep heat levels low enough to prevent battery damage. That's why it's essential to buy wireless chargers from a reputable brand. Learn why Moshi’s Q-coil technology keeps your device cool and was rated “the fastest wireless charger” in the world.
5. Frequent wireless charging degrades your phone's battery life
Charging in general doesn’t have an impact on battery life, and wireless charging may actually be safer than certain fast-charging cables. Qi wireless chargers use a lower current compared to wired charging, which creates a more stable charging scenario. Wireless chargers also make it easy to top off your battery throughout the day. By setting your phone on a nearby charging pad when not in use, you can prevent the battery from dropping below 50%, which may increase the overall lifespan of your battery.
6. Overnight wireless charging can damage your phone
For many people, overnight is the most convenient time to charge. However, some worry that charging while you sleep can lead to overcharging and potential battery damage. Luckily, this isn't something we need to be concerned about. Smartphone batteries have a charge control system that disconnects the battery from the charger as soon as the battery is 100% charged. No matter how long the phone sits on the charger, it stays at the cut-off of the charging current with no risk of overcharging. That applies to both wireless and wired charging.
The future of wireless charging
Wireless charging has a bold, bright future ahead of it. More and more manufacturers are including Qi support in their phones, and peripheral manufacturers are adding Qi charging to more devices.
Wirelessly charging your smartphone will probably get even easier as charging technology advances. Manufacturers like Google and Samsung now support reverse wireless charging on some models, which allows phones to wirelessly charge other phones and smaller devices such as earbuds.
The charging pad itself could be getting a makeover. Some devices like monitors and mouse pads now include integrated wireless charging. New accessories like Moshi’s SnapTo Series feature wireless charging built directly into the mount. Even furniture makers are getting in on the action by creating Qi-enabled tables and desks. That's precisely the kind of innovation that got people so excited about wireless charging when it first hit the scene.
Wondering when larger devices will cut the cord? It's already happening.
In June 2017, Dell launched the world's first laptop that can charge wirelessly using magnetic resonance charging technology. You can expect to see more manufacturers rolling out wireless charging-enabled laptops over the next few years.
Tired of trying to find counter space near an outlet for your Instant Pot, rice cooker, or food processor? Soon you won't need to. The WPC's upcoming Ki Cordless Kitchen standard will deliver up to 2200 W to kitchen appliances wirelessly.
When it comes to wireless charging, the future has finally arrived. There's never been a better time to adopt this promising technology.
Learn more: Q-coil Technology
Moshi’s Q-coil wireless charging module features a multilayer heat sink design for enhanced passive cooling. Unlike cheap wireless chargers made with entry-level components, Q-coil chargers stay cool even while fast-charging.
These are some of the high-quality components and materials that make this possible:
- Our charging coil module uses high-purity copper wire and a high quality ferrite sheet to improve charging efficiency and reduce temperature.
- Low-resistance DC/DC power converters improve conversion efficiency and regulate the circuit board's temperature.
- A special multilayer heat sink dissipates the charger's thermal energy downwards, reducing heat transfer between the charger and the phone.
- Built-in over-voltage, over-current, and over-temperature protection circuits make the charging process safer.
- Qi certification ensures charging compatibility, reliability and safety.
Learn more about the Qi wireless charging specification with our handy guide to Qi EPP, or check out our Q Collection Qi-certified wireless chargers.
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레버리지스탁
로드스탁과 레버리지 방식의 스탁: 투자의 신규 분야
로드스탁에서 제공하는 레버리지 방식의 스탁은 주식 투자의 한 방식으로, 상당한 이익율을 목표로 하는 투자자들을 위해 유혹적인 선택입니다. 레버리지를 이용하는 이 방법은 투자자들이 자신의 투자금을 초과하는 투자금을 투입할 수 있도록 하여, 증권 시장에서 훨씬 큰 힘을 가질 수 있는 기회를 줍니다.
레버리지 스탁의 원리
레버리지 스탁은 원칙적으로 자금을 대여하여 투자하는 방법입니다. 예를 들어, 100만 원의 자금으로 1,000만 원 상당의 증권을 구매할 수 있는데, 이는 투자자들이 기본 투자 금액보다 훨씬 더욱 많은 주식을 구매하여, 증권 가격이 증가할 경우 관련된 훨씬 더 큰 수익을 획득할 수 있게 됩니다. 하지만, 주식 가격이 떨어질 경우에는 그 손실 또한 증가할 수 있으므로, 레버리지를 이용할 때는 신중해야 합니다.
투자 전략과 레버리지
레버리지 사용은 특히 성장 잠재력이 높은 회사에 투자할 때 도움이 됩니다. 이러한 회사에 높은 비율을 통해 적용하면, 성공할 경우 큰 수익을 획득할 수 있지만, 반대의 경우 큰 리스크도 감수해야. 그렇기 때문에, 투자자들은 자신의 위험 관리 능력을 가진 상장 분석을 통해 통해, 어느 회사에 얼마만큼의 자본을 적용할지 선택해야 합니다.
레버리지 사용의 장점과 위험성
레버리지 스탁은 상당한 이익을 약속하지만, 그만큼 큰 위험성 동반합니다. 주식 거래의 변동은 추정이 어렵기 때문에, 레버리지를 사용할 때는 언제나 장터 동향을 세심하게 주시하고, 피해를 최소화하기 위해 수 있는 방법을 세워야 합니다.
최종적으로: 세심한 고르기가 요구됩니다
로드스탁을 통해 제공된 레버리지 방식의 스탁은 효과적인 투자 수단이며, 잘 사용하면 큰 수입을 가져다줄 수 있습니다. 그러나 상당한 위험도 신경 써야 하며, 투자 결정은 충분히 많은 데이터와 신중한 판단 후에 진행되어야 합니다. 투자자 본인의 재정적 상태, 위험을 감수하는 능력, 그리고 시장 상황을 고려한 균형 잡힌 투자 전략이 중요하며.
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chronometer watches
Understanding COSC Validation and Its Importance in Watchmaking
COSC Validation and its Demanding Standards
COSC, or the Controle Officiel Suisse des Chronometres, is the official Swiss testing agency that certifies the precision and accuracy of timepieces. COSC validation is a sign of superior craftsmanship and trustworthiness in timekeeping. Not all timepiece brands follow COSC validation, such as Hublot, which instead follows to its own strict criteria with mechanisms like the UNICO calibre, achieving similar accuracy.
The Art of Precision Timekeeping
The core mechanism of a mechanical watch involves the spring, which provides power as it unwinds. This mechanism, however, can be prone to environmental elements that may impact its accuracy. COSC-validated movements undergo demanding testing—over 15 days in various conditions (five positions, three temperatures)—to ensure their durability and reliability. The tests assess:
Mean daily rate accuracy between -4 and +6 seconds.
Mean variation, maximum variation rates, and impacts of temperature variations.
Why COSC Validation Is Important
For timepiece fans and collectors, a COSC-certified timepiece isn’t just a piece of tech but a demonstration to enduring quality and accuracy. It represents a watch that:
Presents outstanding reliability and precision.
Ensures confidence of quality across the whole design of the timepiece.
Is apt to maintain its value more efficiently, making it a wise investment.
Famous Timepiece Brands
Several famous brands prioritize COSC accreditation for their timepieces, including Rolex, Omega, Breitling, and Longines, among others. Longines, for instance, presents collections like the Record and Soul, which showcase COSC-accredited movements equipped with innovative materials like silicon equilibrium springs to improve durability and performance.
Historic Background and the Evolution of Timepieces
The notion of the chronometer dates back to the need for accurate timekeeping for navigation at sea, emphasized by John Harrison’s work in the eighteenth century. Since the official establishment of COSC in 1973, the accreditation has become a benchmark for assessing the precision of high-end timepieces, maintaining a tradition of excellence in watchmaking.
Conclusion
Owning a COSC-certified watch is more than an visual choice; it’s a commitment to quality and accuracy. For those valuing accuracy above all, the COSC accreditation provides tranquility of mind, ensuring that each certified timepiece will function reliably under various conditions. Whether for personal satisfaction or as an investment, COSC-validated timepieces distinguish themselves in the world of watchmaking, bearing on a legacy of meticulous timekeeping.
Rolex watches
Understanding COSC Certification and Its Importance in Watchmaking
COSC Accreditation and its Rigorous Criteria
Controle Officiel Suisse des Chronometres, or the Official Swiss Chronometer Testing Agency, is the authorized Switzerland testing agency that certifies the accuracy and accuracy of timepieces. COSC accreditation is a symbol of superior craftsmanship and trustworthiness in timekeeping. Not all timepiece brands seek COSC validation, such as Hublot, which instead sticks to its proprietary stringent criteria with mechanisms like the UNICO, attaining equivalent precision.
The Science of Precision Timekeeping
The core mechanism of a mechanical watch involves the mainspring, which provides power as it unwinds. This system, however, can be prone to environmental elements that may influence its precision. COSC-accredited mechanisms undergo strict testing—over fifteen days in various conditions (five positions, three temperatures)—to ensure their durability and reliability. The tests measure:
Mean daily rate precision between -4 and +6 seconds.
Mean variation, highest variation rates, and effects of thermal changes.
Why COSC Accreditation Matters
For watch aficionados and connoisseurs, a COSC-certified timepiece isn’t just a piece of tech but a proof to enduring excellence and precision. It represents a watch that:
Offers excellent dependability and accuracy.
Ensures confidence of quality across the entire design of the timepiece.
Is apt to hold its worth better, making it a wise investment.
Well-known Chronometer Manufacturers
Several famous brands prioritize COSC accreditation for their timepieces, including Rolex, Omega, Breitling, and Longines, among others. Longines, for instance, offers collections like the Record and Soul, which feature COSC-accredited mechanisms equipped with advanced substances like silicon equilibrium springs to improve durability and efficiency.
Historical Context and the Development of Timepieces
The concept of the chronometer originates back to the need for accurate chronometry for navigation at sea, emphasized by John Harrison’s work in the 18th cent. Since the formal foundation of COSC in 1973, the validation has become a yardstick for evaluating the accuracy of luxury watches, continuing a legacy of excellence in watchmaking.
Conclusion
Owning a COSC-accredited watch is more than an aesthetic selection; it’s a dedication to quality and precision. For those valuing precision above all, the COSC validation offers peacefulness of mind, ensuring that each accredited timepiece will operate dependably under various circumstances. Whether for individual satisfaction or as an investment decision, COSC-validated watches stand out in the world of horology, maintaining on a tradition of meticulous chronometry.