Inductive proximity switch based on a transformer coupling factor principle
US7463020B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 8, 2006 |
| Grant date | Dec 9, 2008 |
| Priority date | — |
| Expiry date | Feb 8, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2017/9527
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention relates to a preferably ferriteless inductive proximity switch having at least one transmitting coil, one oscillator circuit and at least two receiving coils arranged in the alternating magnetic field of the transmitting coil, whereby the transmitting coil and the receiving coil are arranged adjacent to each other on a printed circuit board, and also having an evaluation circuit connected to the receiving coil for evaluating the received signal of the receiving coils when a target approaches the proximity switch. The receiving coils (E1, E2, Ei, En, 7, 8, 12, 13) as well as the transmitting coil (S, SA, 11) are made up of at least one polygonal or annular or elliptical winding and they each delineate a polygonal or annular or elliptical coil surface area, whereby either the transmitting coil (S, 11) is surrounded by a first receiving coil (E1, 12) which is, in turn, surrounded by a second receiving coil (E2, 13) and optionally, said second receiving coil is surrounded by a third or nth peripheral receiving coil (En), or a first receiving coil (7) is surrounded by the second receiving coil and optionally, said second receiving coil is surrounded by a third or nth recei…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.