CONTROLLER

PURPOSE:To decrease the number of lines by providing a power supply which holds the current flowing to lines at a prescribed level and at the same time disabling a level discriminator for a timer longer than the changing delay time of a signal given from a slave device owing to the stray capacity ge...

Full description

Saved in:
Bibliographic Details
Main Author HARA YUUJI
Format Patent
LanguageEnglish
Published 10.08.1984
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
PHYSICS
SELECTING
SIGNALLING
TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILARSIGNALS
Online AccessGet full text

Cover

More Information
Summary:PURPOSE:To decrease the number of lines by providing a power supply which holds the current flowing to lines at a prescribed level and at the same time disabling a level discriminator for a timer longer than the changing delay time of a signal given from a slave device owing to the stray capacity generated between lines. CONSTITUTION:It is avoided that an excessive current flows to lines 30 and 31 although a Zener diode Z56 having a low level of breakdown voltage is energized by the function of a constant current circuit. At the same time, it is avoided that just a slight amount of current flows to a Zener diode Z12 having a high level of breakdown voltage. This ensures the accurate working of a level discriminating circuit 33. A disabling circuit 70 contains a compartor M6 and a buffer 71 which receives the signal sent from a resistance R15. The output of the buffer 71 charges quickly a capacitor C, and the electric charge of the capacitor C is supplied to an inverter 74 via a resistance 31. Here the output of the inverter 74 is set at a low level and then delivers a signal of a high level when the input level is larger and smaller than the discriminating level respectively.
Bibliography:Application Number: JP19830013583