The high precise boost dc-dc is used for portable electronic-products power supply, the DC-DC converter in this paper is used for mobile USB OTG power supply.

Due to many advantages of USB (universal serial bus), the interfaces of more and more peripheral products begin to use USB.

Compared with traditional RS232, Universal Serial Bus has been the most favorite choice of data transmission interface in the measuring and control application system.

This paper briefly introduces the development and present conditions of universal serial bus,discusses the hardware construction of USB system in detail,studies the characteristic of USB system thoroughly and explores the problems of USB system nowadays.

Then the use of the CRC in the environment of the universal serial bus(USB) is discussed.

A communication interface system based on C8051F040 single chip micyoco(SCM),universal serial bus(USB) and field programmable gate array(FPGA) technology is designed for C/O logging system to complete bidirectional transmission of data/instruction through a single-core cable as a bridge across surface system and downhole tool.

Based on the convenience and efficiency of the USB interface bus,a new solution is brought forward to combine the Power Line Carrier Communication Module with USB interface,it is easy to fulfill the automatic and network control for familial electric devices.

For the portable transfer device for numerical control program, numerical control program was saved to universal disk of portable transfer device through USB interface by appointment format.

When some microprocessors working with USB equipments in embedded systems without their own USB controller,their USB interface must be expanded .

A new kind of Data Acquisition System is designed in this thesis, which is based on Universal Serial Bus (USB) technology with data acquisition, analysis and display together.