| 摘要 |
PURPOSE:To improve the reliability of a duplicated control system with a simple circuit constitution by connecting both ends of the sense resistance of each control system to each other to shunt a control current and at the same time controlling an operation terminal with the sum of shunted currents. CONSTITUTION:Sense resistances AR0 and BR0 are set to control systems A and B respectively, and at the same time an operation terminal D is controlled with the current supplied from a current source A1 or B1. Thus the control output current sent from the system A, for example, is shunted to the resistances AR0 and BR0 and then flowed into the terminal D. Therefore the system A can fetch the voltage of both ends of the resistance AR0 via an operational amplifier A5; while the system B can fetch the voltage of both ends of the resistance BR0 via an operational amplifier B5 respectively. Then the operation output current of a waiting sytem follows that of a using system. |
