EPRS Admin By / May 24, 2022

Charger components

Figure 1 – Charger components

Figure 1 – Charger components

A typical wired mobile charger is made up of an external power supply (EPS), which plugs into the electrical outlet, and a cable (see Figure 1 below). The cable has plugs at either end. One connects to the receptacle on the EPS and the other to the receptacle on the device that needs to be charged. Both the EPS and the device also need to include an interoperable communication protocol (‘handshake protocol’) that enables the EPS and the device to communicate, so that the EPS does not provide more power than the device requires and does not damage the battery.
The 2009 MoU defined the common charger using the USB Micro-B connector, which provided 7.5 watt (W) power. However, this is either insufficient for charging some of today’s phones with larger batteries or would charge them too slowly. The USB-C connector and the USB Power Delivery (USB PD) communication protocol can deliver fast charging with power up to 100 W, while at the same time supporting adaptive charging. This means that they can adjust the power to the charging requirements of a specific device and can therefore be used for charging a wide range of products. According to the 2019 Commission study mentioned above, modern fast-charging technologies typically provide 15 W of power or more.

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