Non-contact proximity switch
First Claim
1. A non-contact proximity switch with an oscillation circuit having a step-like activation, at least one switch element which affects the time curve of at least one transient response of the oscillation circuit in dependence on its distance from the oscillation circuit, and an evaluation circuit which detects at least one characteristic value for the time curve of the decaying oscillation from at least one transient response of the oscillation circuit after such an activation, comprising:
- (a) a reference voltage source (6) producing at least one reference voltage level (Uref),(b) at least one comparator (5) which compares the amplitude of the transient response with an associated reference voltage level (Uref), and(c) at least one counter (7,
10) which counts the number (DA) of those half-waves of the transient response at least within a portion of the decay period of the transient response, the peak value of which deviates from the associated reference voltage level (Uref) in one of two directions.
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Accused Products
Abstract
A non-contact proximity switch with an oscillation circuit (L 1, C 1) which is activated in a step-like manner, has a reference voltage source (6) which produces at least one reference voltage level (Uref) and has at least one comparator (5) which compares the amplitude of the transient response with the associated reference voltage level (Uref) in order to be able to detect at least one value that is distinctive for the time curve of the decaying oscillation from at least one transient response of the oscillation circuit (L 1, C 1) after such an activation. At least one counter (7, 10) counts, at least within a portion of the decay period of the transient response, the number (DA) of the half-waves of the transient response, the peak of which deviated from the associated reference voltage level (Uref) in one of the two directions.
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Citations
26 Claims
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1. A non-contact proximity switch with an oscillation circuit having a step-like activation, at least one switch element which affects the time curve of at least one transient response of the oscillation circuit in dependence on its distance from the oscillation circuit, and an evaluation circuit which detects at least one characteristic value for the time curve of the decaying oscillation from at least one transient response of the oscillation circuit after such an activation, comprising:
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(a) a reference voltage source (6) producing at least one reference voltage level (Uref), (b) at least one comparator (5) which compares the amplitude of the transient response with an associated reference voltage level (Uref), and (c) at least one counter (7,
10) which counts the number (DA) of those half-waves of the transient response at least within a portion of the decay period of the transient response, the peak value of which deviates from the associated reference voltage level (Uref) in one of two directions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A non-contact proximity switch, comprising:
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at least one switch element (111) in which is arranged an oscillation circuit having a spool (L1) and condensor (C1) which have step-like activation, and an evaluation circuit (101), in which is provided an activation and evaluation spool (L0), said switch element (111) affects the time curve of at least one transient response of the oscillation circuit (L1, C1) in dependence on its distance from the activation and evaluation spool (L0) and said evaluation circuit (101) detects at least one characteristic value for the time curve of the decaying oscillation from at least one transient response of the oscillation circuit (L1, C1) after such an activation; a spool (115) arranged in the switch element (111) magnetically coupled with the activation and evaluation spool (L0) and delivering the operating voltage to the circuit arranged in the switch element (111); a reference voltage source (6) producing at least one reference voltage level (Uref); at least one comparator (5) which compares the reference voltage level (Uref) with a voltage induced in the activation and evaluation spool (L0) by the oscillation circuit (L1, C1) and corresponding to the transient response; and at least one counter (7,10) which counts the number (DA) of those half-waves of the transient response at least within a portion of the decay period of the transient response, the peak value of which deviates from the associated reference voltage (Uref) in one of two directions. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification