EP0531362A1 - Circuit regulateur de signaux - Google Patents

Circuit regulateur de signaux

Info

Publication number
EP0531362A1
EP0531362A1 EP19910909874 EP91909874A EP0531362A1 EP 0531362 A1 EP0531362 A1 EP 0531362A1 EP 19910909874 EP19910909874 EP 19910909874 EP 91909874 A EP91909874 A EP 91909874A EP 0531362 A1 EP0531362 A1 EP 0531362A1
Authority
EP
European Patent Office
Prior art keywords
signal
signals
circuit arrangement
capacitor
arrangement according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19910909874
Other languages
German (de)
English (en)
Inventor
Günter Gleim
Albrecht Rothermel
Karin Rothermel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Thomson Brandt GmbH
Original Assignee
Deutsche Thomson Brandt GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Publication of EP0531362A1 publication Critical patent/EP0531362A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/941—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated using an optical detector
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/01—Shaping pulses
    • H03K5/08—Shaping pulses by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding
    • H03K5/082—Shaping pulses by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding with an adaptive threshold
    • H03K5/086—Shaping pulses by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding with an adaptive threshold generated by feedback
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/941—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated using an optical detector
    • H03K2217/94114—Optical multi axis

Definitions

  • the invention relates to a circuit arrangement for regulating signals of different amplitudes in order to keep a predeterminable signal level constant.
  • Signals with different levels are e.g. generated by light barriers.
  • lines of a line pattern which are attached to the circumference of the rotor of a motor, these generate pulses with the aid of a light-sensitive element, which e.g. be used for commutation and phase control of the motor.
  • a wider line can be arranged within the line pattern in the form of lines of constant narrow width arranged at equal intervals perpendicular to the scanning direction, which line then e.g.
  • the line widths of the line pattern are now subject to tolerances.
  • the light barrier also has tolerances in its efficiency, so that the signals emitted by it are not constant in their peak values. It is known to regulate the reference level R of the light barrier signal to a constant value.
  • the level of the generated signal impulses is independent of the coupling factor of the light barrier.
  • differences in the beam path of the light barrier such as the bundling of the light beam and deviations in the line width in different line patterns still lead to different signal amplitudes, so that it is difficult to distinguish between two different levels.
  • the invention has for its object to set up a control of the signal so that it is independent of the Shafts and tolerances of the signal generator. This task is solved by the measure specified in the claim. Further embodiments of the invention result from the subclaims.
  • the invention has the advantage that e.g. the light barrier, consisting of light source, optical diaphragm and light receiver, can be constructed with larger tolerances and therefore more cost-effectively, which e.g. the rotor of a rotor, on which such a line pattern is applied, is also made more cost-effective.
  • FIG 1 shows the principle of the invention
  • FIG. 2 shows a detailed circuit example of the invention
  • FIG. 3 shows diagrams for explaining the mode of operation of the invention.
  • 1 denotes a known signal transmitter, which consists of a light source 2 and a light receiver 3, between which a diaphragm 4 provided with optical markings is movably arranged.
  • the markings on the optical diaphragm 4 are mechanically rigidly connected, for example, to the head wheel of a head drum imotor. They consist, for example, of dark stripes 5 and 5 ', which are evenly distributed on the circumference and are used for synchronization and phase control of the motor.
  • the strips 5 1 are highlighted over the strips 5 by a greater width. They are used, for example, to create a Lushi gna Is. Depending on the width of the strip passing the light barrier, a pulse signal S with differently large peak values results at the output of the signal generator 1.
  • the narrow strips 5 Due to the wide str fen 5 1 results in the peak value A2, the narrow strips 5 generate pulses with the peak value A1.
  • the pulses with the peak value A1 have a specific and constant pulse-pause ratio t1: t2 at any speed of rotation of the motor and thus the aperture 4.
  • the sensor signal generated is given to the one (+) input of a comparator 6, at the other (-) input there is a reference potential Uref, which corresponds to the mean value of the positive peak values of the pulses with the target peak value A1.
  • the signal change at the comparator 6 produces a potential increase at the output of the control voltage amplifier 8, so that the light source 2 is controlled darker.
  • the currents 11 and 12 are set in such a way that they correspond approximately to half the pulse-pause ratio of the sensor signal, that is to say a large current 11 flows during the time t1 of the pulses and a relati during the time t2 of the pauses small current 12.
  • the currents 11 and 12 behave in a practical circuit example according to FIG. 2 approximately as 50: 1.
  • FIG. 2 shows a detailed exemplary embodiment of the registered arrangement and is described below. This arrangement is particularly suitable for integrated circuit technology.
  • the operating voltage + Vcc is connected to the connection P1 of the arrangement.
  • the connection P2 is connected to the reference potential of the operating voltage.
  • the photosensitive element 3, for example a phototransistor, is connected to the connection P3 and is connected to the operating voltage Vcc via a resistor 11.
  • the connection P4 is connected to the operating voltage Vcc via a series resistor 10 and via a light-emitting element 2, for example a light-emitting diode.
  • a capacitor 7 is connected to the terminal P4, the other end of which is at the terminal P5.
  • the headset Itsi gna l can be removed at the connection P6 and the commutation pulses can be tapped off at the connection P7.
  • currents CI1 + I2) and (12) are generated via current mirrors T2, T3 and T4, T5.
  • the ratio of 12 to 11 is about 1:50.
  • Three comparators K1, K2, K3 compare the generated sensor signal S with three threshold values S1, S2 and S3 specified by the resistors W1, W2, W3 and W4. As soon as the first threshold S1 determined by the comparator K1 is reached, it generates a pulse at the output P7.
  • the output of the comparator K2 is at reference potential, so that the current 11 + 12 via the transistor T6 connected as a diode is derived by mass.
  • the transistor T8 connected as a diode is blocked and the current 12, which charges the capacitor 7, flows until the threshold value S2 is reached by the sensor signal S.
  • the output of the comparator K2 goes high and thus blocks the transistor T6.
  • the current 11 + 12 is no longer diverted via the transistor T6, but instead divides in the node behind the transistor 8 into the current 11, which charges the capacitor 7, and into the current 12, which continues to flow via the transistor 5 .
  • the base current of transistor T9 can be neglected here.
  • the charging time constant of the capacitor 7 is selected to be large enough that the steady state Charge in the capacitor changes very little with each pulse. This results in a steady state of control precisely when the mean value of the peak values of the pulses has adjusted to the threshold of the comparator K2.
  • the voltage value which arises at the connection P5 of the capacitor 7 is amplified via the control amplifier with the transistors T9, T10 and T11.
  • the amplified control signal is impressed on the light-emitting element 2 in such a way that it is regulated brighter as the peak value decreases and vice versa.
  • the capacitor 7 acts in conjunction with the amplifier as an integrator.
  • the output of the comparator K3 goes high, so that the transistor T7 is turned on and the current 11 is derived again to the reference potential. In this case, the current 12 for charging the capacitor 7 becomes irk ⁇ sam.
  • the potential at the terminal P5 drops, the potential at the terminal P4 rises, as a result of which the current through the light-emitting element 2 is reduced.
  • Figure 3 shows the effect of the measure according to the invention.
  • the output pulses from two different sensors are plotted with the conventional control in FIGS. 3a and 3b. It can be seen that the mean value of the positive peak values of the pulses with the smaller peak value in the sensor according to FIG. 3a is M1 and is greater than the mean value M2 of the positive peak values of a sensor according to FIG. 3b.
  • 3c and 3d show the pulse diagrams of two different sensors using the measure according to the invention.
  • the mean values M3 and M4 of the positive peak values of the pulses with the smaller peak value are of the same size, the peak-peak values of the pulses being of different sizes.
  • the invention is not limited to the application just described using the example of a signal which is generated by a line pattern on the circumference of the rotor of a motor.
  • the control circuit according to FIG. 2 operates and reacts in the same way to other signals of the same type that are fed to port P3.
  • the signals can also originate, for example, from a light barrier on an assembly line, in which case they do not necessarily have to be pulse-shaped with steep edges.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optical Transform (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Manipulation Of Pulses (AREA)
  • Optical Communication System (AREA)

Abstract

Lors de l'évaluation de signaux en provenance de capteurs optiques notamment, il faut souvent reconnaître de manière fiable différents niveaux de signaux utiles. Par exemple, des marques d'épaisseurs diverses sont agencées sur le rotor de moteurs à barrillet de tête, de sorte que les marques étroites fournissent des signaux de détection ayant une valeur maximale réduite et les marques larges fournissent des signaux ayant une valeur maximale élevée. Les premiers signaux servent à commuter le moteur à barrillet de tête et les derniers à commuter les têtes magnétiques d'un magnétoscope. Etant donné les tolérances des marques et des composants du circuit d'évaluation, la distinction entre les différentes amplitudes des signaux n'est pas toujours assurée. Afin d'éliminer cet inconvénient, un circuit régulateur de signaux maintient à un niveau constant la valeur moyenne des valeurs maximales de parties sélectionnées de signaux. Ce circuit est utile dans des magnétoscopes, dans des platines à disques compacts, pour réguler en général des parties de signaux.
EP19910909874 1990-05-28 1991-05-21 Circuit regulateur de signaux Withdrawn EP0531362A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4017124 1990-05-28
DE19904017124 DE4017124A1 (de) 1990-05-28 1990-05-28 Schaltungsanordnung zur regelung von signalen

Publications (1)

Publication Number Publication Date
EP0531362A1 true EP0531362A1 (fr) 1993-03-17

Family

ID=6407323

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910909874 Withdrawn EP0531362A1 (fr) 1990-05-28 1991-05-21 Circuit regulateur de signaux

Country Status (7)

Country Link
EP (1) EP0531362A1 (fr)
JP (1) JP3184214B2 (fr)
KR (1) KR0185663B1 (fr)
AU (1) AU7883691A (fr)
DE (1) DE4017124A1 (fr)
HU (1) HUT64652A (fr)
WO (1) WO1991019350A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19934626A1 (de) * 1999-07-23 2001-01-25 Fotoelek K Pauly Gmbh & Co Kg Detektionsvorrichtung mit Impulsspeicher

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2846207A1 (de) * 1978-10-24 1980-05-08 Licentia Gmbh Anordnung zur pegelregelung fuer digitale empfaengersysteme
US4479057A (en) * 1982-09-27 1984-10-23 Sun Electric Corporation Automatic biasing control circuit for emissions detector
DE3528453A1 (de) * 1985-08-08 1987-02-19 Thomson Brandt Gmbh Videorecorder

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9119350A1 *

Also Published As

Publication number Publication date
HU9203717D0 (en) 1993-04-28
JPH05509206A (ja) 1993-12-16
WO1991019350A1 (fr) 1991-12-12
HUT64652A (en) 1994-01-28
KR0185663B1 (ko) 1999-05-01
DE4017124A1 (de) 1991-12-05
AU7883691A (en) 1991-12-31
JP3184214B2 (ja) 2001-07-09

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