Electronic switching device and circuits with a plurality of such switching devices
US5977662A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 1997 |
| Grant date | Nov 2, 1999 |
| Priority date | — |
| Expiry date | May 20, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/945
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An electronic proximity switching device with a proximity indicator and with an electronic switch which can be controlled by the proximity indicator. A plurality of these switching devices can be series connected without an unacceptable voltage drop occurring on the series connection when the switching devices are conductive, by the electronic switch of each switching device being connected to one input (2) of an AND element (3), another input (4) of the AND element (3) representing a control input (5) of the switching device, the output (6) of the AND element (3) representing the output (7) of the switching device, and load current flowing via the AND element (3) in the conductive state of the switching device. In other words there is AND element (3) in addition to an inductive proximity switch (1). A circuit for monitoring of the state of a system, for example, a fault state in an aerial railway or chairlift system, is provided with a plurality of switching devices (10), and with a control and evaluation unit (11), the switching devices (10) being series connected to one another and to the control and evaluation unit (11). When a fault state of the system is detected by the serie…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.