Title:
SETTER
Document Type and Number:
Japanese Patent JPS6273303
Kind Code:
A
Abstract:
PURPOSE:To reduce the occurrence of hunting and to prevent the quick change of a set value due to external noise by providing a blind sector so that the set value is not changed when a deviation voltage is lower than a prescribed value. CONSTITUTION:A pair of reverse connected diodes d1 and d2 are connected to the output of an amplifier 10 which amplifies the deviation voltage by prescribed times, and a voltage/frequency converter 12 is connected to outputs of these diodes. Consequently, the deviation between a set voltage and a feedback voltage is absorbed by diodes d1 and d2 and is not inputted to the converter 12 if the absolute value of this deviation is smaller than the diode forward voltage due to diodes d1 and d2. If the deviation voltage exceeds the forward voltage of diodes, the voltage of the excess is inputted to the converter 12 and a pulse having a frequency corresponding to the inputted voltage value is generated, and this pulse is counted up or down by a counter 2.
Inventors:
KOBAYASHI TOSHIHIRO
Application Number:
JP21403785A
Publication Date:
April 04, 1987
Filing Date:
September 26, 1985
Export Citation:
Assignee:
SHIMADZU CORP
International Classes:
G05B5/01; G05B11/36; (IPC1-7): G05B5/01; G05B11/36
Attorney, Agent or Firm:
Nakamura Shigenobu