DE3405130A1 - Pulse transmitter - Google Patents

Abstract

The invention relates to a pulse transmitter comprising a remagnetisable magnetic wire, in the associated induction coil of which, when external magnetic fields occur, electrical pulses are generated which are conducted by means of connections to a location different from the transmitter location for the purpose of evaluation or further processing; in the case of connections consisting of electrical lines, and when these are run in motor vehicles, high-frequency electromagnetic interference (ignition sparks) is not impossible so that noise pulses are also transmitted. This is prevented by the invention in that a light-emitting diode (6) is connected in parallel with the induction coil (3) of the transmitter (1), the light pulses (L) of which diode are coupled into one end (7) of an optical fibre (8) whilst the other end (9) of the optical fibre is associated with a light detector diode (10) from which electrical pulses (E) can be picked up. <IMAGE>

Description

Licentia Patent-VerwaltungB-GmbH
* Theodor-Stern-Kai 1
D-6D0D Frankfurt 70

13.2.B * t

Impulse generator

The invention relates to a pulse generator according to the preamble of claim 1.

There are already pulse generators with a magnetizable magnetic wire known to be connected to an inductive coil is provided; when exposed to RineR external An abrupt Ufnagnetization of the magnetic field takes place Wire and in the induction coil is a voltage pulse induced (DE-OS 32 03 133).

In many cases, such encoders are used the measuring location is not the same as the location of the evaluation or conductor processing of the induced electrical Impulses; the induction coil of the encoder is therefore connected to electrical components by means of electrical lines (Electronics) of the evaluation location connected. If such encoders are used in motor vehicles, see below when laying the electrical lines in the motor area electromagnetic interference, for example from ignition sparks, cannot be ruled out and thus In addition to the actual useful pulses, there are also interference pulses with a voltage-time curve that is similar to the Mutzimpuls on.

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The invention is based on the object that when using the magnetic encoder in an environment in which Electromagnetic interference is to be expected, no interference pulses in the connection between the encoder and electronics be interspersed.

This task is characterized by that in claim 1 Features solved.

Expedient developments of the invention are set out in the subclaims refer to.

The advantages achieved by the invention are that the connection between the transmitter and the electronics at the evaluation or processing location can be of any length; No interference pulses are generated by external electromagnetic fields; for standing under high voltage electrical environment, the compounds do not require such a high isolation j, as in electrical cables he ν

2Π is required; there are neither current nor voltage sources required, since a light pulse is generated from the magnetic energy of the G2bsrrirahtes alone, which a Optical fiber passes through and is implemented again as a voltage pulse to the electronics of the evaluation or üThe place of further processing is output; further advantages of the connection are corrosion and temperature resistance.

The invention is described below with reference to an exemplary embodiment shown schematically in the drawing explained in more detail.

1 with a known encoder is referred to, which in principle consists of a magnetizable magnetic wire 2 and a there is associated induction coil 3, the ends of which are led to connections A, 5; acts on encoder 1 an external magnetic field, then in the coil 3 a

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induced electrical impulse, which occurs at the connections U, occurs.

A light-emitting diode is connected to the connections U , 5, which in the event of an induced pulse carries current and thus emits a light pulse L; this light pulse is coupled into one end 7 of an optical fiber 8 adjacent to the light-emitting diode 6, for example a multimode fiber, and passed through

1D runs this fiber, which is of any length and due to interference-prone environments (engine area of motor vehicles, High voltage areas). The other end the optical fiber 8 is located at one of the transmitter location A. any remote location B; this other end 9 of the optical fiber 8 is assigned a light detector diode 10, the light pulse emerging from the optical fiber 8 receives so that at their terminals 11, 12 a bodice electrical impulse E occurs, which is evaluated or further processed will.

20th

The transmitter 1 and the light-emitting di nrlp f) are expediently seen against high frequency electrnmagnpti? Btn'Tf p.1 γΙργ arranged together in a shield 13.

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Claims (1)

Licentia Patent-l / erujaltungs-GmbH Tneodor-Stern-Kai 1 6G0D Frankfurt 70 F flit / 7 13.2.Bi Impulsgeber Patentäfrsprbcheii 1. Pulse generator with a magnetizable magnetic
Wire, in whose associated induction coil, when external magnetic fields occur, electrical impulses are generated which. by means of. Connections are sent to a location different from the birth for the purpose of evaluation and / or further processing,
characterized,
that parallel to the induction coil (3) of the transmitter (1) a light-emitting diode (G) through which the pulse current flows is connected, the light pulses of which in dnc a
End (7) of an optical fiber (8) are coupled in, while the other end (9) of the optical fiber (B) is assigned a light detector diode (10) from which electrical pulses (E) can be removed. Z. pulse generator according to claim 1,
characterized, that the transmitter (1) and the light-emitting diode (6) jointly protect against high-frequency electromagnetic interference fields are shielded (13).