Title:
INSULATION-TYPE SIGNAL TRANSMISSION DEVICE
Document Type and Number:
Japanese Patent JP2015076665
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To enable operation of a control object device even at a time of failure of a control side device in an insulation-type signal transmission device that performs insulation transmission of an electric signal in which a direct current signal and a communication signal are superposed from the control side device to the control object device.SOLUTION: An insulation-type signal transmission device performs insulation transmission of an electric signal in which a communication signal is superposed on a direct current signal from a control side device to a control object device. The insulation-type signal transmission device comprises a lower limit limiter circuit to output a lower limit direct current signal to the control object device if a direct current signal from a control device is below a prescribed lower limit value.
Inventors:
ITO KEN
Application Number:
JP2013210143A
Publication Date:
April 20, 2015
Filing Date:
October 07, 2013
Export Citation:
Assignee:
YOKOGAWA ELECTRIC CORP
International Classes:
H04L25/02
Domestic Patent References:
| JP2001052282A | 2001-02-23 | |||
| JP2005072637A | 2005-03-17 | |||
| JPS63209314A | 1988-08-30 | |||
| JP2011239362A | 2011-11-24 | |||
| JPS62125706A | 1987-06-08 | |||
| JP2001052282A | 2001-02-23 | |||
| JP2005072637A | 2005-03-17 | |||
| JPS63209314A | 1988-08-30 |
Foreign References:
| WO1997014213A1 | 1997-04-17 | |||
| US3999084A | 1976-12-21 | |||
| WO1997014213A1 | 1997-04-17 | |||
| US3999084A | 1976-12-21 |