| 摘要 |
PURPOSE:To realize an automatic control to an allowable level at a certain torque velocity and regardless of the characteristics of a circuit to be controlled, by detecting whether the comparison value between the output voltage of the circuit to be controlled and a prescribed level of voltage that varies successively is set to zero from a certain level or not. CONSTITUTION:A differential amplifier 12 compares the output of a circuit 11 to be controlled and comparing reference voltages 15-18 of a certain level. A pulse converter 19 produces a pulse when the comparing voltage has the negative value and exceeds a cirtain level. A zero state detecting circuit 20 produces an allowable error switch signal S1 and a motor reverse signal S2 when the comparing voltage reaches a prescribed positive level, and sets the control level with the prescribed accuracy. This procedure is carried out until the required most accurate allowable error by switching the comparing reference voltage. The switch pulse of an allowable error switch indicator 24 at that moment is used as a stop signal to stop the operation of a motor 30. An attenuation ratio calculator 21 calculates the ratio of attenuation by checking the degree of error for the result of control on the basis of the final value and also by comparing the votage obtained at the starting time point of the control with the final value. |
