Design And Implementation Of Medical High-Speed Centrifuge Control Alarm System

Medical High-Speed Centrifuge is an important application of Centrifuge, which is widely applied for related fields of biological cells and human blood. In order to achieve the effect of solution purification of enrichment and separation, the solution is treated in the way of centrifugation precipitating that make the biological cell, biological macromolecules and plasma particles separate from other substances by high speed rotation way that is applied by Medical High-Speed Centrifuge. Now, in the domestic, the most of researches of Medical High-Speed Centrifuge is based on the theory, which is focused on the control method and the module of control method. The research about application and alarm of Medical High-Speed Centrifuge is fewer. For the current situation, this thesis aims on implementation and design a control and alarming system of Medical High-Speed Centrifuge, and the system is tested according to correlative nation standards.This thesis analyzes the work flow of Medical High-Speed Centrifuge, and demandanalysis is carried on the analysis. When the system of Medical High-Speed Centrifuge is power on, the system checks itself. The item of self-check is the checking of sensor status, the checking of secure state of control system and the checking of secure state of gate. When the self-checking completed, control system follow the control command. The control system controls the speed of motor to achieve the effect of centrifugal sedimentation. In the process of Medical High-Speed Centrifuge, the system adjusts the motor speed that conforms to control command by checking the status of motor in the way of checking sensor data. In order to enable the system work in the limited temperature range, system checks the cavity temperature of Medical High-Speed Centrifuge, if the cavity temperature is higher than threshold, refrigerating system is active to make the temperature down to the threshold.On the basis of demand analysis, the hardware includes control mainboard, liquid crystal display module, temperaturesensor, motor status sensor, motor driver and refrigeratingsystem. The motor state sensor is based on a hall sensor, the system sample the speed data by sampling the data of hall sensor. The motor driver is based on three-phase bridge inverter. The three-phase bridge inverter selects the insulated gate bipolar translator that conforms to the standards, in order to enable insulated gate bipolar translator works properly.The architecture of software system chooses the pipe and filter architecture. The software system includes sensor module, signal and data processing module, motor control driver module and refrigeratingsystem module. The sensor module is a data processing that sensor data is from the motor status sensor and temperaturesensor.The function of sensor module is checking the cavity temperature and motor status in real time. Signal and data processing module adjust parameter according to the sensor module data in real time. The signal and data processing module handle the motor speed in the set range. The signal and data processing module adjust the temperature parameter according to the sensor module data in real time. The signal and data processing module handle the cavity temperature in the set range. The motor control driver module and refrigeratingsystem module adjust the control parameter; change the out signal of driver circuit and refrigerating system.This thesis does the test of system according to relevant standard. The item of testing includes relevant indexes such as the motor speed and cavity temperature. The system is to enable the parameters conform the standard. The alarm system testifies the function in the condition that the indexes are out of the standard.