| 摘要 |
PURPOSE:To obtain a DC control circuit which is always reset to a normal operation by making the output range of a limitter narrower than the plus and minus identification value intervals respectively, and limiting the output range of a controller down to a level at which the prescribed conditions are satisfied. CONSTITUTION:The range of the DC voltage 103 superposed on a subtractor 3 is limited to the prescribed value + or -L within + or -d. Therefore the input 102 of an A/D converter 4 is set at +L or -L although an input is cut off and the input 100 of the subtractor 3 is set at zero potential. Now the expected maximum DC drift containing the DC variance of a quadruple input signal is set at + or -D, and the value of L is selected to satisfy d>=(D+L). Thus it is possible to prevent the generation of such initial conditions that causes and abnormal lead-in phenomenon. Then the output range of a limiter 6 is limited to the value which satisfies the conditions less than the plus minus identification value interval (d). It is easy to obtain a DC voltage control circuit which is free from an abnormal lead- in phenomenon. |
