Fast charging common detailed explanation
(Glossary) The world of smartphone charging is rapidly advancing and filled with new terms, so here is a brief explanation.
- Fast charging: An abbreviation for quick charging. It is also referred to as rapid charging, and in docomo, it is called high-speed charging, but since the abbreviation does not fit well, we have standardized it as fast charging here. Description of fast charging operation: Built-in QC/PD compatible IC charger → QC/PD cable with an additional signal line → When charging a smartphone: - When the smartphone is QC/PD compatible, the charging voltage progresses as follows: DC 12V 1.5A → 9V 2A → 5V 3A. As charging progresses, the IC control changes the charging voltage from 12V to 5V, protecting the smartphone while charging in about one hour. - When the smartphone is not QC/PD compatible, charging is possible only at 5V. Moreover, since the charger/cable is designed for high current, it can charge faster than the typical 1A charger/cable that usually comes with smartphones. Note: Caution against overheating on the smartphone side!
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