Device for transformation of parameters of variable- induction pickups

FIELD: measurement equipment.

SUBSTANCE: the device has a pulse generator, whose output is connected to the measuring and reference arms connected to the measuring and reference arms of the variable-induction pickup, circuit providing for separation of the pulse of mismatch between the durations of the transparent processes in the measuring and reference arms. The duration of the mismatch pulse is determined by the difference of the parameters of the inductance coils of the measuring and reference arms. Each arm of the pickup has an inductance coil, transistor and a capacitor. The transistor bases are connected to the output of the pulse generator. The signal ends of the inductance coils are connected to the transistor emitters and to the comparison inputs of the comparators. The other ends of the coils are connected to a common bus. Capacitors are cut in between the transistor collectors and emitters. The collectors of both transistors are connected to the voltage source.

EFFECT: enhanced sensitivity.

3 dwg

 

The invention relates to measuring technique and can be used in control systems of technological processes, carrying out measurement of mechanical and magnetic quantities with sensors inductive type.

Among the existing conversion parameters inductive sensors are devices, the principle of which is based on the transformation parameters of the sensor in the duration of the transition process (Slangin V.M. Digital measuring device. - M.: Higher. school, 1981). These devices feature high performance compared with similar devices that use a bridge circuit or circuits on the basis of the oscillating LC circuit, though inferior to the latter in sensitivity and measurement accuracy.

The closest to the technical nature of the claimed invention is selected as a prototype conversion device parameters sensors inductive and resistive types (Patent RF №2168728 Method and device for converting signals from sensors inductive and resistive types / B. I. No. 16, 2001). In this device, an inductive sensor consists of a measuring and a reference shoulders, each of which includes the parallel connected inductor, resistor and diode with a large recovery time reverse resistance. Cu is touramanis the current pulse excites the measuring and reference arms of the sensor transients, the length of which depends on the parameters of the inductors. Using comparator and circuit “Exclusive OR” emit a pulse of the error, the duration of which by means of the integrator is converted into voltage and then using the ADC - to-digital Converter.

The prototype of the claimed invention have the following similar characteristics: both use the same principle, based on the transformation parameters of the sensor in the duration of the transition process; in both devices the sensor consists of a measuring and a reference shoulders, each of which contains a coil of inductance; in both devices, the difference in the duration of the transient processes in the measuring and reference the shoulders is converted into a pulse width mismatch.

The disadvantage of the prototype is that the use of the measuring and reference arms of the sensor parallel-connected inductor, resistor, and diode, allowing for high performance devices is not possible to obtain a high sensitivity inherent in the devices using bridge scheme or schemes based on oscillatory LC circuit.

The technical result is an increase in the sensitivity of the transducer parameters of inductive sensors is achieved by the fact that unlike the prototype in the inventive device of each of the e from the shoulders of the sensor includes a transistor T i(i=1, 2), the emitter of which is connected inductor Liand between the collector and emitter switched capacitori(figure 1). Submission of a short electrical pulse U0at the base of the transistor T1and T2causes in the measuring and reference arms of the sensor transients (signals U1and U2), the length of which depends on the parameters of the inductors. The sensitivity of the transducer is determined by the ratio Δτ/ΔL, where Δτ and ΔL changing the duration of the transition process and the change in the inductance of the coil, respectively. As shown by the results of the circuit simulation, the sensitivity of the claimed invention is significantly higher than that of the device of the prototype.

The structural scheme of the device is presented in figure 2. The device includes a pulse generator 1, the output of which is connected to the bases of transistors measuring and reference arms of the sensor T1and T2to the emitters of the transistors connected to the signal ends of the inductors L1and L2, the other ends of the coils connected to a common bus, and between the collectors and emitters of the transistors included capacitors C1and C2while the collectors are connected to the voltage source +Un; Comparators 2 and 3, the first inputs of the comparison to the which is connected to the signal ends of the coils of the sensor, and the second inputs of the comparison with the common bus; two JK-flip-flop 4 and 5, the clock inputs of which are connected to the outputs of the Comparators, the input reset flip-flops with the output of the pulse generator, and the outputs of the triggers two inputs schema Exclusive-OR 6”; the circuit “Logical And” 7, one input of which is connected to the output of the circuit “Exclusive OR”, and the other input with the output of the generator, the pulses of 8; set of series-connected counters 9 and 10, the reset inputs of which are connected with the output of the pulse generator, the clock input of the first counter - with the output of the circuit “Logical And”, and the output end of the account of the first counter with a clock input of the second counter.

The operation of the transducer explain the timing diagram of voltages presented on figure 3. An electrical impulse U0excites the measuring and reference arms of the sensor transients U1and U2. Duration transients τ1and τ2determined by the time of the transition voltages U1and U2through the zero level, depend on the parameters of the inductors L1and L2. Comparator 2 measuring shoulder converts the analog signal U1the pulses U3TTL logic. A similar transformation implements the comparator 3 of the support shoulder. Using JK-flip-flop 4, and installed in the output state of the pulse U 0allocate time τ1at which the output signal of the trigger U4takes the value log.1. A similar transformation provides the trigger 5, highlighting the duration of the transition process in the reference arm, i.e. the time τ2at which the output signal of the trigger 5 takes the value log.1. With schema Exclusive-OR 6 of the signals from the outputs of the triggers emit a pulse of the error U5duration is determined by the difference of the parameters of the coils of the measuring and reference arms of the sensor. Converting the pulse width of the error in the digital code is performed using the scheme of “Logical And” 7, one input of which receives a pulse of the error, and on the other counting the pulses from the generator output of the counting pulses 8. Pulses from the output of the circuit “Logical And” is fed to the input of the counter 9. Overflow of the counter 9 a corresponding pulse of the overflow is fed to the input of the counter 10, which allows to extend the bit width of the digital code. Installation of smart meters in its original state provides the impetus U0from the output of the generator 1.

The positive effect of this technical solution is that the use as a sensing element inductive sensor transistor coil inductance in uh eternal circuit and a capacitor, included between the collector and emitter, instead of the sensitive element of the parallel-connected inductor, resistor and diode can significantly improve the sensitivity of the transducer parameters of inductive sensors.

A device for converting parameters of inductive sensors, which includes the pulse generator, the output of which is connected with the measuring and reference shoulders inductive sensor; two comparator, the first input of the comparison which is connected with the signal ends of the coils of the sensor, and the second inputs of the comparison with the common bus; two JK flip-flop clock inputs of which are connected to the outputs of the Comparators, the input reset flip-flops with the output of the pulse generator, and the outputs of the triggers two inputs schema “Exclusive OR”; the circuit “Logical And”, one input of which is connected to the output of the circuit “Exclusive OR”and the other input with the output of the generator counting pulses; a set of series-connected counters, reset inputs are connected to the output of the pulse generator, the clock input of the first counter with the output of the circuit “Logical And”, and the output end of the account of the first counter with a clock input of the second counter, wherein each of his shoulders sensor includes an inductor, a transistor and a capacitor, whereas the om base of the transistor is connected to the output of the pulse generator, the signal ends of the inductors is connected to the emitters of the transistors and to the inputs of the comparison of the comparator, and the other ends of the coils to the shared bus between the collectors and emitters of the transistors capacitors are included, and the collectors of both transistors are connected to the voltage source.



 

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