Power-off loss prevention prompt expansion circuit and method for USB device

• Main Authors: WANG XIAOHONG, SU WEILIN, TIAN LIANFANG, CHEN YINGJIE, LIU SHOUSONG, HUANG-SHI QIUJIANG
• Format: Patent
• Language: Chinese; English
• Published: 21.12.2016
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention discloses a power-off loss prevention prompt expansion circuit and a method for a USB device. The circuit comprises a USB interface circuit, a charging and discharging module and an alarming module, wherein the charging and discharging module is respectively connected with the USB interface circuit and the alarming module; the USB interface circuit is respectively connected with a USB interface in a computer and a USB interface in the USB device; when the computer is power-on, a USB power supply of the computer is connected, the USB interface circuit transmits the USB power of the computer to the charging and discharging module for charging; and when the computer is power-off, the USB power supply of the computer is disconnected, the charging and discharging module performs discharging, the alarming module is power-on, and loss prevention prompt is carried out. According to the power-off loss prevention prompt expansion circuit and the method for the USB device, the structure is simple; the cost