US 12,255,643 B2
Proximity switch and method for detecting an object to be sensed
Alexander Magnus Makkinga, Muelheim an der Ruhr (DE); Oliver Marks, Duisburg (DE); and Michael Faber, Luedenscheid (DE)
Assigned to TURCK HOLDING GMBH, Halver (DE)
Filed by TURCK Holding GmbH, Halver (DE)
Filed on Jan. 15, 2021, as Appl. No. 17/149,767.
Claims priority of application No. 10 2020 100 939.9 (DE), filed on Jan. 16, 2020.
Prior Publication US 2021/0226625 A1, Jul. 22, 2021
Int. Cl. H03K 17/95 (2006.01); H03K 17/955 (2006.01)
CPC H03K 17/954 (2013.01) [H03K 17/9545 (2013.01); H03K 17/955 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A proximity switch comprising:
an oscillating circuit configured to detect carbon based on a change in amplitude of a detection signal,
wherein the oscillating circuit has a resonant frequency in a range of from 0.8 MHz to 20 MHz,
wherein the oscillating circuit comprises a first pair of coils, a second pair of coils, and a capacitor,
wherein the first pair of coils includes a first transmitting coil and a first receiving coil, and
wherein the second pair of coils includes a second transmitting coil and a second receiving coil.