Optocoupler input expansion circuit
US5925888A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 8, 1997 |
| Grant date | Jul 20, 1999 |
| Priority date | — |
| Expiry date | May 8, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY04S10/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrical system is provided which includes multiple electrical loads which are powered by an AC voltage source. A synchronization circuit generates a synchronization signal which is representative of the half-cycle of the AC voltage source. A load circuit includes multiple AC line-voltage switching devices and the multiple electrical loads. Each AC line-voltage switching device controls the application of power from the AC voltage source to a respective one of the electrical loads. An input circuit senses the multiple AC line-voltage switching devices and generates a single output signal which is representative of the states of the multiple AC line-voltage switching devices. A processing circuit determines the states of the multiple AC line-voltage switching devices based upon the synchronization signal and the single output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.