A Supervisory System Of Ship Storage Batteries Based On Power Line Carrier Communication

The lead-acid storage battery group is the drive power supply or contingency power supply for many ships. It is also the contingency power supply for train command management, post commumcation, bank and etc. So the performance of the storage battery group is directly related to the normal running of ship, train, post communication, bank and etc. It is necessary to measure batteries' parameters accurately and frequently in order to enhance their lives, run them reliably and ensure the batteries in the optimal working states. In the past, the testing of the storage batteries' parameters was completed artificially. However, this method has many disadvantages. It's slow to test batteries artificially, the measurement precision is low, and the surroundings of storage battery cabin are very harmful to people's health. So it's very important to design a device which can test batteries automatically.According to the problem which is encountered in the testing of lead-acid storage battery, a supervisory system of lead-acid storage battery based on power line communication is designed and developed in this thesis. The system adopts distributed structure. Applying the DPSK (Differential Phase Shift Keying) technology with the ability of anti-jamming, it uses the DC power line existing in battery cabin as the commumcation medium between the master and the slave computers. Each slaver computer has a MSP430F135 MCU as core, a Pt 100 as the temperature sensor, a density sensor, a liquid switch and corresponding signal processing circuit. They can detect the working states of all the storage batteries in a cabin. The master computer uses a MSP430F149 MCU as core to set the alarm parameters, patrol or inquire slaver computers. It also has functions such as key input, display, storage and uploading to PC computer.Demarcating the corresponding sensors, the measurement precision meets the need of lead-acid storage batteries testing at present. Trying to run the DC power line carrier communication, the master computer can patrol or inquire slaver computers in each storage battery's testing box reliably. This system also can be applied to storage batteries testing in the fields of electric power, communications or finance.