Can the USB port convert voltage?

Firstly, we need to understand the basic electrical characteristics of USB ports. The standard USB port provides a 5 volt DC power supply, which is the standard voltage required for most USB devices to operate. This 5 volt power supply can provide a maximum current of 500 milliamperes (mA) to connected devices, which is sufficient for most small peripherals such as smartphones, USB drives, mice, etc. However, some high-power devices, such as tablets or portable hard drives, may require higher currents and may even require different voltage levels. This raises the question of whether the USB port can convert voltage.
In early versions of the USB standard, there was no requirement that USB ports must support voltage conversion functionality. USB ports usually only provide a fixed voltage output of 5V and do not have the ability to adjust voltage. This means that if a device requires power supplies of different voltage levels, it usually requires an external power adapter to achieve this.
However, with the development of USB technology, especially the advancement of USB charging technology, some new USB specifications have begun to support higher current output and even voltage regulation functions. For example, the USB Power Delivery (USB PD) standard allows the USB port to adjust the output voltage and current according to the device's needs. This technology can adjust the voltage between 5V and 20V and provide a power output of up to 100W, allowing the USB port to charge high-power devices such as laptops and tablets.
In addition, some specially designed USB chargers are equipped with voltage conversion function, which can adjust the output voltage according to the specific requirements of the connected device. These chargers typically identify the required voltage and current through communication with the device, and then adjust the output accordingly.
In addition to USB PD, there are other proprietary charging protocols such as Qualcomm's Quick Charge technology, which also provide similar dynamic voltage and current adjustment functions. The emergence of these technologies has made USB ports no longer a single 5V power output, but more intelligent and multifunctional.
In summary, traditional USB ports do not have voltage conversion capabilities and typically only provide a fixed voltage output of 5V. But with the introduction of new technologies, some USB ports can now adjust the output voltage and current according to the needs of the connected devices. These advances have greatly expanded the functionality of USB ports, enabling them to adapt to a wider range of electronic devices and providing users with more flexible and convenient charging solutions. In the future, we can foresee that with the continuous advancement of technology, the voltage conversion function of USB ports will be more perfect, meeting a wider range of application needs.