Incremental integrator and the resulting servosensors

Details Incremental integrator and the resulting servosensors Incremental integrator and the resulting servosensors

1980-06-26

1982-09-14

Dobeck, B.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318681, 328127, 73503, G05F 100

Patent

active

043497691

DESCRIPTION:

BRIEF SUMMARY
The purpose of the present invention is the development of a precision integrator and the incremental-output servosensors resulting from it.
This invention is particularly applicable to integrators with an operational amplifier mounted as a summing integrator that sums currents I.sub.1 and I.sub.2 at the integrator input and in which the current I.sub.2 may result from the connection of a resistor R.sub.2 to a symmetrical reference voltage generator (Vr-), (Vr+) through two switches (FIG. 1); as the output of the analog integrator (point S) is connected on the one hand, to a reversing switch via a flip-flop which gives the sign of the output voltage and on the other hand, to a level detector via a full-wave rectifier; this detector controls a monostable circuit connected to each of the two switches through the reversing switch, the effect of which is to deliver through resistor R.sub.2 quantities of electricity calibrated according to the following formula: ##EQU1##
The main difficulty in the realization of known incremental-output integrators lies in the fact that the quantity of electricity is generally defined by a current pulse of calibrated intensity and duration.
Another disadvantage with the known system is that two symmetrical and adjusted reference voltages are necessary.
A further disadvantage with known systems of this type is linked with their sensitivity to switching speed on the one hand and to the spurious conduction resistance of the switches on the other hand.
All of these disadvantages are suppressed in the precision incremental-output integrator according to the present invention.
In this new integrator the current I.sub.2 is obtained by the discharge of a capacitor C.sub.2, delivering quantities of electricity calibrated according to the following formula:
The present invention also concerns an incremental-output servosensor resulting from the use of the said precision incremental-output integrator. This is a sensor in which the magnitude to be measured, originally electrical, becomes a physical magnitude shown by an electromechanical force generator, owing to the fact that the analog amplifier of the precision incremental-output integrator (terminals A-S, FIG. 2) is replaced by the force generator of the servosensor (FIG. 3), the return current of which is current I.sub.2 discharged by capacitor C.sub.2.
One of the prime aims of this sensor is to minimize the difference between a measured magnitude converted into force and the return force, and to express it in digital form.
Another aim of this sensor is to be applicable generally to all the servosensors in all cases where the magnitude to be measured can be converted into a force, implying a force generator such as an electromagnet for instance intended to measure an acceleration or an angular velocity, to give just two examples.
The features and advantages of the invention will be explained in the description following and the appended drawings, but the features and advantages listed are not exhaustive.
FIGS. 1 and 2 attached represent respectively a known integrator circuit (FIG. 1) and the precision integrator according to the present invention (FIG. 2).
FIG. 3 is a diagram of the incremental-output servosensor resulting from the use of the precision integrator according to the present invention (FIG. 2).
FIG. 4 is an enlarged representation of the dotted area on FIG. 3.
FIG. 1 shows a precision incremental-output integrator of the type comprising: an operational amplifier mounted as an analog summing integrator which sums currents I.sub.1 and I.sub.2 at the integrator input (point A); a current I.sub.2 that may result from connecting a resistor R.sub.2 to a symmetrical reference voltage generator (Vr-), (Vr+) via two switches (FIG. 1); the output of the analog integrator (point S) is connected on the one hand to a reversing switch via a flip-flop that gives the sign of the output voltage, and on the other hand to a level detector through a full-wave rectifier, the said detector controlling a monostable circuit connected to each on

REFERENCES:
patent: 3355952 (1967-12-01), Romberg
patent: 3429189 (1969-02-01), Krabbe
patent: 3782205 (1974-01-01), Fletcher
patent: 3842371 (1974-10-01), Kelley
patent: 4001662 (1977-01-01), LeGallais
patent: 4263627 (1981-04-01), Rose
patent: 4280083 (1981-07-01), Hirai
Strong, LSI converts an old technique into low cost AD conversion, in Electronics, pp. 102-105, Sep. 11, 1972.
Horner et al., DMM and DAC Modules Expand Low Cost Measuring System, Hewlett Packer Journal, pp. 7-14, vol. 24, Jun. 1973.

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