Title:
SYSTEM CONTROL CIRCUIT
Document Type and Number:
Japanese Patent JPH05204403
Kind Code:
A
Abstract:
PURPOSE:To attain minituarization and to execute proper control by reducing the number of constitution elements in a system control circuit outputting a control signal whose pulse width is controlled by means of an input signal. CONSTITUTION:The input signal is inputted to a comparator 4 by an analog multiplexer 3 by time division so as to be compared with a reference signal transmitted from a D/A converter 2. An electronic switching circuit 5 changes over an output electron to reference potential and ground potential in accordance with the output of the comparator 4 so as to input it to respective integration circuits X1-X4. At this time, the output of the electronic switching circuit 5 is inputted synchronous with the time division timing of the analog multiplexer 3 by respective electronic switches Sc1-Sc4. Then, the respective comparators Q1-Q4 compare the charge and discharge output of capacitors C1-C4 in the respective integration circuits X1-X4 with a triangle wave signal transmitted from a triangle wave signal generating circuit 8 so as to output a control signal whose pulse width is controlled.
Inventors:
SUZUKI KOJI
KISHIMOTO JUNICHI
KISHIMOTO JUNICHI
Application Number:
JP1505992A
Publication Date:
August 13, 1993
Filing Date:
January 30, 1992
Export Citation:
Assignee:
CANON KK
International Classes:
G05B11/26; G05B11/36; (IPC1-7): G05B11/26; G05B11/36
Attorney, Agent or Firm:
Hiroyuki Niwa (1 outside)
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