Fault-tolerant control system research based on dual CPU redundancy for high-voltage inverter

With the deepening of China´s reform and the rapid development of economic construction, the needs of energy-saving and environmental protection are growing significantly. As the optimal method of induction motor control, high-voltage frequency conversion technology has been widely used. In some industries the reliability of high-voltage high frequency device is concerned. The purpose of this paper is to provide the method of multi-CPU redundancy, fault-tolerant design based on high-voltage inverter, to enhance the reliability of the high voltage inverter. With the application, high-voltage inverter control system can automatically switch main and standby CPU without stopping motor or affecting the operation. The situation that frequency can not be adjusted or motor must be stopped for errors can be avoided. This improves the continuous operation and reliability of control system and the whole system.