Title:
SIGNAL PROCESSING DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/013157
Kind Code:
A1
Abstract:
The present invention provides a signal processing device for a two-wire sensor that is capable of exhibiting high performance, without losing any capability thereof, while ensuring that a two-wire cable can be used and that a 4-20 mA output can be obtained, which are merits of a two-wire system. Provided is a signal processing device 300 that has a sensor 10 and a signal converter 100 which converts a signal detected by the sensor, wherein: a pair of output signal terminals 120 and 130 for a semiconductor pulse and a pair of power supply terminals 140 and 150 are provided to an external cable connection part 20 of the sensor; superimposed power supply lines 210 and 220 are formed in which a current consumed by a pulse output circuit is superimposed on a current consumed by the power supply terminals of the sensor with one of the pair of output signal terminals connected to the positive side of the power supply terminals via a prescribed resistance 160 and with the other of the signal terminals and the negative side of the power supply terminals short-circuited; the sensor and the signal converter are connected by the superimposed power supply lines; and the signal converter extracts, from waveforms of superimposed currents flowing through the superimposed power supply lines, only a signal 304 corresponding to a pulse output.
Inventors:
WASHIO KENJI (JP)
Application Number:
PCT/JP2022/014223
Publication Date:
February 09, 2023
Filing Date:
March 25, 2022
Export Citation:
Assignee:
OVAL CORP (JP)
International Classes:
G08C19/02; G01F1/00; G01F1/84; H04B3/54
Foreign References:
| JPS6062198U | 1985-05-01 | |||
| JP2013160767A | 2013-08-19 | |||
| JPS62269016A | 1987-11-21 | |||
| JP4952820B2 | 2012-06-13 | |||
| JP3139502B2 | 2001-03-05 |
Attorney, Agent or Firm:
TOWA INTERNATIONAL PATENT FIRM (JP)
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