Electronic monitoring system with selective signal inverter
US4135124A · kind A · utility
Inventor
Key dates
| Filing date | Jun 20, 1977 |
| Grant date | Jan 16, 1979 |
| Priority date | — |
| Expiry date | Jun 20, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/945
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A contactless motion detector is energized from a source of direct current via a pair of supply leads and delivers an output signal by way of a further conductor to a control electrode of a binary electronic switch, such as a thyristor, in series with the source and a load to modify the flow of load current upon the approach of a metallic element, for example. An Exclusive-OR gate is inserted in the further conductor to act as a selective signal inverter, one input of this gate being permanently connected to one supply lead while being also selectively connectable to the other supply lead whereby the load current can be either increased or reduced upon the occurrence of the event to be detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.