Circuit arrangement method for obtaining an output signal, and rotational speed measurement device comprising such a circuit arrangement

Abstract

The present invention provides a circuit arrangement for obtaining an output signal (Va) form a signal (Vs) containing at least one alternating component comprises a signal source (1) that supplies this signal (Vs), a first peak value detection device (2) for determining a maximum value (Vmax) of the signal (Vs), a second peak value detection device (3) for determining a minimum value (Vmin) of the signal (Vs), a first signal linking device (4, 5, 6, 71) for obtaining a first resulting signal (V1) by additive linking of the signal (Vs), the maximum value (Vmax) and the minimum value (Vmin) in accordance with the rule: V1 = K1*{Vs - (Vmax + Vmin) / 2}, in which K1 is a freely selectable first constant factor, a second signal linking device (7, 72) for obtaining a second resulting signal (V2) by additive linking of the maximum value (Vmax) and a minimum value (Vmin) in accordance with the rule: V2 = (Vmax - Vmin)*K2, in which K2 is a freely selectable second factor, a first squaring device (8) for squaring the first resulting signal (V1), a second squaring device (9) for squaring the second resulting signal (V2) and a third signal linking device (100, 11, 101) for obtaining the output signal (Va) by additive linking of the squared first resulting signal ((V1)<2>) and the squared second resulting signal ((V2)<2>) in accordance with the rule: Va = K3*{(1 / 8)*(K1 / K2)<2>*(V2)<2> - (V1)<2>}, in which K3 is a freely selectable third constant factor. By means of the invention, which furthermore includes a rotational speed measurement device comprising such a circuit arrangement and also a method of obtaining an output signal, an unchanged or increased resolution of the output signal can be achieved from the signal containing an alternating component having a restricted resolution.

Description

technical field [0001] The invention relates to a circuit arrangement for obtaining an output signal from a signal containing at least one AC component. The invention also relates to a rotational speed measuring device comprising such a circuit arrangement and to a method for obtaining an output signal from a signal containing at least one AC component. Background technique [0002] From part 5.6 of the document "Technical Information TI 861105" published by the company Valvo on May 11, 1986 under the title "Uses of magnetic field sensors KMZ 10" (Uses of magnetic field sensors KMZ 10)" and related appendices image 3 A device for measuring rotational speed is known in .3, which device comprises a reluctance magnetic field sensor and a magnetic or magnetizable gear as an encoder, which device provides a practically sinusoidal output voltage. Using the number of teeth of the gear and thus the number of magnetic poles of the encoder, the instantaneous resolution of the output ...

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Problems solved by technology

However, this means that the output voltage resolution of the magnetic field sensor drops undesirably during encoder operation, since the magnetic poles of the encoder represent a greater angle of rotation for the latter

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