The output voltage of a USB charger usually ranges from 4.8V to 5.2V, and the maximum output power is usually limited to 2.5W. In addition, a USB charger with a power of more than 10W (i.e. 5V 2A) can be called fast charging.
Types and standards of USB chargers
USB 2.0: The output voltage is 5V, the maximum current is 500mA, and the transmission speed is 480Mbps. Suitable for most old and new smartphones, tablets and other USB devices.
USB 3.0: The output voltage is also 5V, but the maximum current can reach 900mA, and the transmission speed is faster, but it is mainly used for data transmission, and the charging speed is not much different from USB 2.0.
USB Type-C: Supports higher current and power, and is commonly used in modern devices and fast charging technology. For example, a charger using a USB Type-A/B interface can only provide a maximum charging power of 5V@900mA without a charging protocol, which is equivalent to a charging power of 4.5W.
Application fields of USB chargers
Mobile devices: widely used in devices such as smartphones, tablets and MP3 players, providing frequent data transmission and charging functions. Computer peripherals: such as keyboards, mice, printers and external storage devices, Micro USB interfaces are also widely used in these devices. In-vehicle devices: such as car chargers and infotainment systems, support connecting smartphones and other devices through Micro USB interfaces. Home appliances: such as smart TVs, game consoles and smart home devices, Micro USB interfaces are used to connect external storage devices and realize various functions.
