| 摘要 |
PURPOSE:To ensure the smooth control of a controlled system by applying the fixed voltage or the manually variable voltage in place of the output voltage supplied from an integration circuit in case the break of a negative feedback loop is detected. CONSTITUTION:The voltage (dd) which is proportional to the deviation between the control quantity (ca) given from a controlled system 30 and the target value is generated by a deviation voltage generating circuit 10. An integration circuit 20 controls the controlled system 30 so as to set the voltage (dd) at O. When a loop break detector 60 detects the break of a negative feedback loop, switches 41 and 51 are actuated. Threfore the voltage (cd) is applied to the controlled system 30 from a voltage generating circuit 40. Then the circuit 20 performs control so that its voltage (id) is equal to the voltage (cd) of the voltage generating circuit 40. When the break of the negative feedback loop is recovered, the switches 41 and 51 are restored. Then the voltage (id) of the circuit 20 is set at a normal level with the voltage (cd) set as the initial value. |
