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EP0166699A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Circuit for detecting the passage through zero of the signal generated by an electromagnetic sensor of the phonic wheel type

Assignee: Marelli Europe SpA
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Filing: 1985-05-27
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Granted: —
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Expires: 2005-05-27
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Abstract

Abstract The circuit comprises a first threshold comparator (2) with hysteresis, intended for connection to the sensor (S) and for outputting a signal (b) indicative of the passage through zero of the signal (V) at its input. The sensor (S) is also connected to an integrating circuit (4) the output of which is connected to the input of a second threshold comparator (5). The latter outputs an electrical enabling signal (D) only when the signal (C) provided by the integrating circuit (4) exceeds a predetermined threshold value (V 2 ). An enabling circuit (7) is connected to the outputs of the first and second threshold comparators (2; 5) and outputs the signal (b) generated by the first comparator (2) only when the second comparator (5) outputs the enabling signal (D).

Inventors

  • 👤 Giuseppe Cotignoli
  • 👤 Ezio Fogliati

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-04 12:51
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/153; H03K5/1536; G; G01; G01R; G01R19/00; G01R19/175

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 163 words
A circuit for detecting the passage through zero of the signal (V) generated by an electromagnetic sensor (S;W) of the phonic wheel type or the like, comprising a first threshold comparator (2) with the hysteresis, intended for connection to the sensor (S) and for outputting a signal (b) indicative of the passage through zero of the signal (V) at its input, characterised in that it further includes: an integrating circuit (4) the input of which is connectible to the sensor (S), a second threshold comparator (5) connected to the output of the integrating circuit (4) for outputting an enabling electrical signal (D) only when the signal (C) output by the integrating circuit (4) exceeds a predetermined threshold value (V 2 ), and an enabling circuit (7) connected to the outputs of the first and second threshold comparators (2; 5) and arranged to output the signal (b) generated by the first comparator (2) only when the second comparator (5) outputs the enabling signal (D).
Claim 2
Dependent Claim 163 words
A circuit for detecting the passage through zero of the signal (V) generated by an electromagnetic sensor (S;W) of the phonic wheel type or the like, comprising a first threshold comparator (2) with the hysteresis, intended for connection to the sensor (S) and for outputting a signal (b) indicative of the passage through zero of the signal (V) at its input, characterised in that it further includes: an integrating circuit (4) the input of which is connectible to the sensor (S), a second threshold comparator (5) connected to the output of the integrating circuit (4) for outputting an enabling electrical signal (D) only when the signal (C) output by the integrating circuit (4) exceeds a predetermined threshold value (V 2 ), and an enabling circuit (7) connected to the outputs of the first and second threshold comparators (2; 5) and arranged to output the signal (b) generated by the first comparator (2) only when the second comparator (5) outputs the enabling signal (D).
Claim 3
Dependent Claim 19 words
A detector circuit according to Claim 1, characterised in that the integrating circuit (4) is of the active type.
Claim 4
Dependent Claim 44 words
A detector circuit according to Claim 1 or Claim 2, in which the first comparator circuit (2) is of the inverting type, characterised in that the second comparator circuit (5) is of the non-inverting type and the enabling circuit (7) is a NOR circuit.

References Cited (Backward Citations)

US3768024A Cited
DE2640242A1 Cited
EP0026588A1 Cited
EP0117789A1 Cited

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