Diagnosis apparatus for photo coupler and photo coupler device with diagnosis function
US4937441A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 28, 1988 |
| Grant date | Jun 26, 1990 |
| Priority date | — |
| Expiry date | Oct 28, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/7955
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A diagnosis apparatus for a photo coupler having at least one photo coupler including a light emitting element the amount of light emitted from which changes in accordance with the value of a current flowing therethrough and a light receiving element which receives the light from the light emitting element to convert it into an electric signal corresponding to the received amount of light, a checking current setting circuit for setting a current flowing through the light emitting element to a current value for checking, a level detecting circuit for controlling a current flowing through the light emitting element on the basis of the current value set by the checking current setting circuit, a reference signal generator for generating a reference signal, a comparing and detecting circuit for comparing the electric signal from the light receiving element with the reference signal and detecting the deterioration of a function of the photo coupler on the basis of the result of comparison.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.