DE2932324A1 - AC tachometer generator with linearising circuit - has lineariser measurement diode bias current for increased null linearity - Google Patents
AC tachometer generator with linearising circuit - has lineariser measurement diode bias current for increased null linearityInfo
- Publication number
- DE2932324A1 DE2932324A1 DE19792932324 DE2932324A DE2932324A1 DE 2932324 A1 DE2932324 A1 DE 2932324A1 DE 19792932324 DE19792932324 DE 19792932324 DE 2932324 A DE2932324 A DE 2932324A DE 2932324 A1 DE2932324 A1 DE 2932324A1
- Authority
- DE
- Germany
- Prior art keywords
- bias current
- circuit
- tachometer generator
- linearity
- voltage
- 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- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/46—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring amplitude of generated current or voltage
Abstract
Description
Wechselcteon-Tachometer-Generator.Interchangeable octeon speedometer generator.
Die Erfindung befaßt sich mit einer Verbesserung des im Nauptpatent P 29 19 594.0 beschriebenen Tachogenerators mit linearisierter, gleichgerichteter Ausgangsspannung.The invention is concerned with an improvement in the main patent P 29 19 594.0 described tachometer generator with linearized, rectified Output voltage.
Die Linearisierung hierin beruht auf der Messung des Spannungsabfalss in einer Diode, der durch den Laststrom erzeugt wird. Dieser Laststrom wird aber in der Nähe des Nullpunkts, - wo gerade die Linearisierung am wichtigsten ist,- sehr klein. Die Dioden eren sehr hochohmig. Deshalb mußte der Meßverstärker sehr hochohnig sein, am besten mit 53T - ingong, was lie Anordnung. verteuert. In Nullpunkt, also bei Stillstand der Maschine, wenn die Tachospannung ebenfalls Nu1l sein sollte, ist auch dies nicht ausreichend, da selbst die kleinsten Offsetströme im eingang des Verstärkers schon merkliche Diodenspannungen erreben. So bleibt eine ausgangsspannung bestehen, die zwsr nur einer sehr kleinen Drehzahl (z.B. 0,5 U/min) entspricht, die aber die Wirksamkeit der Linearisierung empfindlich verschlechtert.The linearization here is based on the measurement of the voltage drop in a diode that is generated by the load current. However, this load current is near the zero point, - where the linearization is most important, tiny. The diodes have a very high resistance. So the measuring amplifier had to work very hard be arrogant, best with 53T-ingong, what lie arrangement. expensive. In zero point, i.e. when the machine is at a standstill, when the tachometer voltage should also be Nu1l, this is also not sufficient, since even the smallest offset currents are in the input of the amplifier can already reach noticeable diode voltages. This leaves an output voltage exist, which corresponds to only a very low speed (e.g. 0.5 rpm), which, however, seriously worsens the effectiveness of the linearization.
.rfindungsgemaA wird dieser Nachteil dadurch beseitigt, daß zusätzlich zu dem, durch den äußeren Lastwiderstand 26 gezogenen Laststrom, ein annähernd konstanter Vorstrom gespeist aus der Versorgungsspannung der Elektronik, mittels einer Konstantstromschaltung durch die jeweilige Meßdiode, jedoch nicht durch den Arbeitswiderstand geschickt wird. Dieser Vorstrom fließt natürlich auch bei Stillstand und beseitigt dadurch dic beschriebenen Nachteile.According to the invention, this disadvantage is eliminated in that, in addition to the load current drawn through the external load resistor 26, an approximately constant one Bias current fed from the supply voltage of the electronics by means of a constant current circuit sent by the respective measuring diode, but not by the working resistance will. Of course, this bias current also flows at standstill and is thus eliminated the disadvantages described.
In Fig. 1 vird al Beispiel einer-,an sich belrannten,-Konstantstromschatung ein Transistor mit Emitterwiderstand verwendet. Es seien 50 der Generator, 51 der Gleichrichter und 52 eine Linearisierungsschaltung nach dem Hauptpatent mit dem Widerstand 19, an dem die Korrekturspannung abfällt.FIG. 1 shows an example of a constant current circuit which is fired per se a transistor with emitter resistor is used. Let 50 be the generator, 51 the Rectifier and 52 a linearization circuit according to the main patent with the Resistor 19, across which the correction voltage drops.
26 ist der äußere Lastwiderstand. 53 ist die Stromversorgung für die Elektronik mit dem Pluspol 54, dem Minuspol 55 und der 4i.tte 56. Die Mitte 56 ist mit dem ausgang des Linearisierers 52 verbunden.26 is the external load resistance. 53 is the power supply for the Electronics with the positive pole 54, the negative pole 55 and the 4i.tte 56. The middle 56 is connected to the output of the linearizer 52.
Der Transistor 57 ist über len Emitterwi erstand 58 und den Spannungst iler 59 und 60 30 mit der Stromver prgung verbunden, daß er einen ausreichend konstanten Vorstrom zieht. Wesentlich ist, daß @ein Kollektor 61 nicht mit der gleichen Stromversorgung condern mit dem anderen Pol Der Stro fließt also über den Gleichrichter 51 und den Linearisierer 52 zum Iluspol 54, in jeaem fall über die Meßdiode, jedoch nicht über lestwiderstand 26. Auch, wenn die Tachospannung Null ist, wird durch die halbe Versorgungsspannung am Transistor 57 die Funktion als Vorstromeuelle gewährleistet.The transistor 57 is over the emitter resistor 58 and the voltage iler 59 and 60 30 connected with the Stromver prgung that it has a sufficiently constant Pre-current draws. It is essential that a collector 61 does not have the same power supply condern with the other pole The current thus flows through the rectifier 51 and the Linearizer 52 to Iluspol 54, in each case via the measuring diode, but not via reading resistance 26. Even if the tachometer voltage is zero, half the supply voltage at the transistor 57, the function as a pre-current source is guaranteed.
Selbstverstindlich muß der bnn-Transistor 57 in dem Fall durch einen npn - Transistor - mit entsprechender Polung der Versorgung - ersetzt verden, wenn der linearisierer 52 nicht, wie im Beispiel der Fig. 1, im Pluspol, sondern im Minuspol der gleichgerichteten Tachospannung zwischengeschaltet ist.Of course, the bnn transistor 57 must in this case by a npn - transistor - with appropriate polarity of the supply - replaced verden, if The linearizer 52 is not in the positive pole, as in the example in FIG. 1, but in the negative pole the rectified tacho voltage is interposed.
Schon surch einen Vorstrom von der Größenordnung 1 mA liegt der Meßdioden-Widerstand im Kiloohmbereich, was eine genaue Ausgangsspannung Null bei Stillstand, celbst mit einfachen Verstärkern der 741-Familie, ergibt. Schwankungen des Vorstroms, z.B. durch Individualstreung ler Fransistoren oder durch Temperstursch ankungen haben auf die Genauigkeit keinen Einfluß.A bias current of the order of magnitude of 1 mA already causes the measuring diode resistance in the kilohm range, which means an exact output voltage of zero at standstill, celbst with simple amplifiers from the 741 family. Fluctuations in bias current, e.g. due to individual scattering of transistors or due to temperature changes has no influence on the accuracy.
L e e r s e i t eL e r s e i t e
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19792932324 DE2932324A1 (en) | 1979-08-09 | 1979-08-09 | AC tachometer generator with linearising circuit - has lineariser measurement diode bias current for increased null linearity |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19792932324 DE2932324A1 (en) | 1979-08-09 | 1979-08-09 | AC tachometer generator with linearising circuit - has lineariser measurement diode bias current for increased null linearity |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2932324A1 true DE2932324A1 (en) | 1981-02-26 |
Family
ID=6078050
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19792932324 Withdrawn DE2932324A1 (en) | 1979-08-09 | 1979-08-09 | AC tachometer generator with linearising circuit - has lineariser measurement diode bias current for increased null linearity |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2932324A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3306786A1 (en) * | 1983-02-26 | 1984-08-30 | Fa. J.S. Staedtler, 8500 Nürnberg | WRITING FLUID |
DE3327995A1 (en) * | 1983-08-03 | 1985-02-14 | Helmuth Dr. 6330 Wetzlar Frenk | AC tachometer generator |
DE3341173A1 (en) * | 1983-11-14 | 1985-05-30 | Helmuth Dr. 6330 Wetzlar Frenk | Method for rectifying multiphase AC voltages of tachometer generators |
-
1979
- 1979-08-09 DE DE19792932324 patent/DE2932324A1/en not_active Withdrawn
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3306786A1 (en) * | 1983-02-26 | 1984-08-30 | Fa. J.S. Staedtler, 8500 Nürnberg | WRITING FLUID |
DE3327995A1 (en) * | 1983-08-03 | 1985-02-14 | Helmuth Dr. 6330 Wetzlar Frenk | AC tachometer generator |
DE3341173A1 (en) * | 1983-11-14 | 1985-05-30 | Helmuth Dr. 6330 Wetzlar Frenk | Method for rectifying multiphase AC voltages of tachometer generators |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8141 | Disposal/no request for examination |