The reason why it should be a smartphone charging "rapid support" but late

Digital life

ちょっとした知識や工夫で、充電時間を短縮したり、バッテリーの寿命を延ばしたりできる（写真はイメージ＝PIXTA）

Laptops and smartphones that are usually charged casually.In fact, a little knowledge and ingenuity can reduce charging time and extend the life.Answer the battery and charging questions based on the latest circumstances.

Q.What does "rapid" and "fast" charging mean?

In a USB cable or USB charger for smartphones / tablets, products that claim "fast charging" and "high -speed charging" are available in the package."Fast charge" or "high -speed charging" has no clear definition.The time required for charging depends on the amount of current (ampair) flowing during charging."Rapid" and "high speed" are USB2.0 standard 0.In many cases, products that support charging with the amount of current exceeding 5A (amper) are claimed.

市販のUSBケーブルやUSB充電器のパッケージには、「急速充電」や「高速充電」と記載された製品が多い

However, it is early to think that if you buy a USB charger or cable that supports "rapid" and "high speed", it will always be a quick charge.This is because the number of amperts described in the product only indicates the performance that passes through the current.

As shown in the figure, all three of the USB charger, mobile battery, which are the supplier of power, cables that flow power, and charging terminals are realized for the first time.

急速充電が可能になるのは、電力供給側とケーブル、充電する端末の三者がそろって対応している必要がある。充電量が大きいほど条件が厳しい

If you know that the terminal is compatible with rapid charging, the correct answer is to choose a product that supports chargers and cables.

Q.Does the charging time change depending on the terminal?

The amount of current that can be played depends on the USB terminal standard.The USB terminal of the personal computer can be easily used for charging, but the maximum current current is USB2..0 in 0.5a, USB3.0 but 0.Stay only 9A.2.Chargers and mobile batteries corresponding to the current volume of 4A and 3A can be charged higher than the USB terminal of the computer.

USB給電の標準的な規格や仕様をまとめた。主にアンドロイド端末の充電時に影響する。最近増え始めたタイプC端子は最大で3Aだ。ちなみに、iPhoneなどのアップル製品は独自の仕様となっている

In recent years, the battery capacity of smartphones has increased, so the current amount is 1..A standard called "USB Battery Charge (BC)" extended to 5A has been formulated.Most recent Android devices support this USB BC.If you use a USB charger or use a dedicated cable for charging, you can charge it using the USB BC standard.In fact, the current is 1 on the normal USB terminal of a personal computer..It went up to about 2A.

Furthermore, recent laptops and smartphones have the increasingly adoption of USB type C, which have no front and back of the terminal shape, and is compatible with the standard.On the other hand, Apple products such as iPhone use their own specifications.The iPhone6 or later and iPads are compatible with high -output charging.

Some of the products that use Type C have a new standard called USB PD (Power Delivery).The PD specification is a power supply of up to 20V (bolt) with a voltage and a current of 5A and a maximum of 100W (watts), and is attracting attention as a next -generation charging standard.

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