US2020287541A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2020287541-A1 |
| Application number | US-201816647845-A |
| Country | US |
| Kind code | A1 |
| Filing date | Sep 27, 2018 |
| Priority date | Sep 27, 2017 |
| Publication date | Sep 10, 2020 |
| Grant date | — |
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Official abstract text for this publication.
The invention relates to an inductive proximity switch. The object of the invention to present a very simplified inductive position sensor, which can be reliably used for detecting a zero crossing of its output voltage when a target moves by will be solved by an inductive proximity switch comprising a transmitter coil, a receiver coil, an integrated circuit for excitation of the transmitter coil and a signal processing unit for processing a received signal from the receiver coil, wherein an oscillator excites a resonant circuit comprising the transmitter coil and a parallel capacitor for inducing a voltage in the receiver coil, wherein the receiver coil comprises two symmetrical segments with opposite orientation that are connected in series, wherein the transmitter coil surrounds the segments of the receiver coil or the transmitter coil is surrounded by the segments of the receiver coil.
Opening claim text (preview).
1 . An inductive proximity switch comprising a transmitter coil, a receiver coil, a circuit for excitation of the transmitter coil and a signal processing unit for processing a received signal from the receiver coil, wherein an oscillator excites the transmitter coil for inducing a voltage in the receiver coil, wherein the receiver coil comprises two symmetrical segments with opposite orientation that are connected in series, whereas the transmitter coil ( 2 ) surrounds the segments of the receiver coil or the transmitter coil is surrounded by the segments of the receiver coil. 2 . The inductive proximity switch according to claim 1 , wherein the transmitter coil is part of a resonant circuit, which comprises also a parallel capacitor. 3 . The inductive proximity switch according to claim 1 , wherein the transmitter coil and the receiver coil have a rectangular shape. 4 . The inductive proximity switch according to claim 1 , wherein the receiver coil has a sinusoidal, trapezoidal, triangular or random geometrical shape. 5 . The inductive proximity switch according to one of the claim 1 , wherein the two segments of the receiver coil have a symmetrical shape. 6 . The inductive proximity switch according to claim 1 , wherein the transmitter coil has multiple turns. 7 . The inductive proximity switch according to claim 1 , wherein the receiver coil has multiple turns. 8 . The inductive proximity switch according to claim 1 , wherein the signal processing unit comprises an active rectifier controlled by the oscillator frequency followed by a low pass filter for converting an alternating current into a direct current value, an amplifier and a comparator for outputting a position of a target detected by the inductive proximity switch. 9 . The inductive proximity switch according to claim 7 , wherein the signal processing unit comprises a low pass or band pass EMI filter. 10 . The inductive proximity switch according to claim 1 , wherein the inductive proximity switch comprises a target detection coil and means for signal processing of additional received signals by the target detection coil. 11 . The inductive proximity switch according to claim 10 , wherein the target detection coil comprises three segments, a center segment and two side segments, connected in series, whereas an area of the center segment is the sum of the areas covered by the two side segments. 12 . The inductive proximity switch according to claim 11 , wherein the two side segments are identically sized.
Sensor · CPC title
incorporating printed inductors · CPC title
Constructional details · CPC title
controlled by an oscillatory signal · CPC title
Phase comparison, i.e. where a phase comparator receives at one input the signal directly from the oscillator, at a second input the same signal but delayed, with a delay depending on a sensing capacitance · CPC title
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