Develop To The Electric Quantity Measurement Base On The Embedded Processor

The embedded system have largely changed people's life, the work and the entertaining fashion after several dozens year development.moreover these changes also in acceleration. The embedded processor has the innumerable types, each kind has the unique individuality.Such as MP3,digital camera and printer. In the automobile has many embedded systems whitch can make the automobile more livelier, cleaner and easier to drive. This topic mainly designs one kind take ARM7 as the nucleus embedded processor's in electric quantity metering mechanism application. Makes the electric quantity metering mechanism the precision to enhance to 0.5 level. Manifested the embedded processor's precision to be high, the speed was quick, integration good and so on characteristics. This system circuit mainly includes the ethernet interface circuit, the electric power parameter sampling circuit, the status identification circuit, the make-and-break electrically controlled system electric circuit, the liquid crystal electric circuit, the pressed key input circuit, the acousto-optics alarm circuit, the real-time clock electric circuit as well as other control circuit composition. The ethernet interface circuit uses DM9000A to take the ethernet controller, as a result of its fine performance, the inexpensive price, causes it to choose in the network card design is more widespread. In the electrical energy parameter gathering electric circuit, uses the high accuracy the mutual inductor and the improvement software synchronization exchange sampling method carries on the electric power parameter gathering, and has carried on the digital filtering to the sampled data, and the algorithm has carried on data processing according to the integral. The status identification circuit and the make-and-break electrically controlled system electric circuit has composed the intelligence switching circuit. The software aspect, uses the embedded TCP/IP agreement, realized has transmitted the student user using the ethernet to use electricity the data request. Using timer interrupt mode, and the establishment timer interrupt priority is highest, has realized electric quantity gathering and the memory, has guaranteed the electric quantity gathering timely request. Moreover, the use judgment power factor COSφvalue, has realized the judgment malignant load request.This topic embarks from the staff apartment's reality. This system can overcome the deficiency which effectively the present each kind of electric quantity measurement exists. Impelled the electric quantity supervisory system to the informationization, the network, the intellectualized direction to develop.