Optocoupler built-in self test for applications requiring isolation
US5323014A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1993 |
| Grant date | Jun 21, 1994 |
| Priority date | — |
| Expiry date | Mar 1, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/2635
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optocoupler circuit arrangement includes an isolated power source for producing a bipolar test signal, an analog multiplexer switching matrix coupled to the isolated power source for receiving and distributing the test signal, control logic for controlling the analog multiplexer switching matrix, and a plurality of optocouplers, each having a respective electrically isolated output circuit and an input circuit for receiving input signals from an external source. The optocoupler input circuits are coupled to the analog multiplexer switching matrix to receive respective test signals therefrom under control of the control logic. Blocking circuitry is provided at the optocoupler input for isolating the test signals from the external source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.