UNIVERSAL SERIAL BUS ADAPTOR AND UNIVERSAL SERIAL BUS CABLE

摘要

A universal serial bus (USB) adaptor supplies a large charging current to charge a device. The USB adaptor includes a voltage conversion circuit, a USB interface, a current detection circuit, a first switch, a second switch, and a third switch. The USB interface includes a power pin, a first data pin, a second data pin, and a ground pin. The current detection circuit detects a charging current of the device, and converts the charging current into a voltage to compare the charging current with a reference voltage to output a comparison signal. The first switch, the second switch, and the third switch control connection relationships between the power pin and the first data pin, the first data pin and the second data pin, and the second data pin and the ground pin according to the comparison signal, respectively. A USB cable is also provided.

主权项

1. A universal serial bus (USB) adaptor comprising:
a voltage conversion circuit converting voltage signals output by an external power; a USB interface comprising a power pin connected to the voltage conversion circuit, a first data pin, a second data pin, and a ground pin; a current detection circuit connected to the voltage conversion circuit and the ground pin, the current detection circuit detecting a charging current of a device, and converting the charging current into a voltage to compare the charging current with a reference voltage to output a comparison signal; a first switch connected to the current detection circuit, the power pin, and the first data pin, the first switch controlling a connection relationship between the power pin and the first data pin according to the comparison signal output by the current detection circuit; a second switch connected to the current detection circuit, the first data pin, and the second data pin, the second switch controlling a connection relationship between the first data pin and the second data pin according to the comparison signal output by the current detection circuit; and a third switch connected to the current detection circuit, the second data pin, and the ground pin, the third switch controlling a connection relationship between the second data pin and the ground pin according to the comparison signal output by the current detection circuit.