Usb Power Harmonic Data Acquisition System-based Research And Design

Electricity is a essential source of energy for people's lives. With increase of the non-linear loads in power system, harmonics pollution of the power system is growing. Harm of power harmonics is very great. Not only affects the life of power equipment in the grid, but also affects the grid's own security. To study the power harmonic so as to find the way of control is very important. To get the data of harmonic is the primary prerequisite for prevention.Through analysis of the data acquisition, the program of data acquisition basedon USB was put forward in the paper, and compare with the traditional bus-based data acquisition program. Then, the architecture of the USB was deeply analyzed. According as the features of power harmonic data acquisition, the detailed hardware and software design was introduced. In the hardware section, choice of sensor and A/D converter was introduced, and With the CY7C68013-56pin chip of Cypress Company as the core for the entire data acquisition system based on USB is designed. The sensor and chip were introduced detailed. Hardware design is completed, including design of A/D converter and interface chip connection, and design of power conversion circuits, etc. the technology of PCB process was required. In the software part, the data collection and transmission were controlled by firmware in Cy7C68013. The USB driver design process and the design of PC management procedures were introduced in the paper. Finally, the system of data acquisition based on USB was designed complete.The data acquisition system used the USB technology to acquire,transmit and save data have the attributes of plus-and-play.