SU385289A1 - FREQUENCY-PULSE DIFFERENTIATING DEVICE - Google Patents

Description

one

The invention relates to the field of automation (And computing.

In computing and measuring equipment, as well as in control systems, the need arises (receptions p, p1ai1zvodn, th from the analog signal (voltage, current), taken, for example, from the sensor. In this case, in systems using electronic digital machines (ECM) is desirable up to about: per; 1; and differentiation - to have a signal in the frequency-pulse form, which in sTiOiM case is easily converted into a digital form | y.

The well-known solution to this problem is based on the serial connection of two transducers, a differential, an incisive element of the analog signal, and a current converter into the frequency of pulses.

This solution has two drawbacks.

BiO-nep.BbLx, the scheme is complex and contains a lot of (intermediate transformation nodes.

Secondly, the device doesn’t receive inaccurately, since the conversion errors in the intermediate nodes (differentiating element, amplifier) are included in the errors of the device and are summed with the error of the current into the pulse frequency.

The aim of the invention is to simplify the scheme | and increase accuracy.

This gap is achieved due to the fact that in the proposed device, the threshold element 5 is connected between comparing the capacitors and the source of the input terminal.

On f: I1g. 1 given funded cxeiMa device; and FIG. 2 - its local electrical circuit.

The device contains 1 source of input OILNAL 1 and a current converter in the frequency of pulses 2.

Converter 2 is configured on a comparison sensor (subtractive) sensor 3, threshold element 4, pulse duration normalization unit 5, key circuit 6, and sources of reference and bias currents 7 and 8, respectively.

The device works as follows.

With a CONSTANT value of you, of the input signal (of the input signal source / regardless of the level of this signal, the output of the converter is 2 AND: with pulses with a constant (carrier) frequency.

At the same time, there is a d 1m in the circuit (the equilibrium between the amount of electricity when charging comparative capacitor 3 from a source of bias current 8 and the amount of electricity when this capacitor is discharged by a differential reference current

from: Nstoch.vika etalinointo current 7 l displacement tshsam. Each cycle: on a comparative (subtractive) 1container "sator 3", a comparison takes place;

When the key circuit 6 is turned off, the capacitor 3 is charged with current from a source of bias current. 8. When dusti.izhanii cash. 1 to the capacitor 3 threshold value, p-avnogo. On the output of the differential signal source /, the logical element 4 generates a signal that triggers the normal & aH block, and the duration (impulse 5, for example, a single vibrator.

The impulse from the output of block 5 includes a key circuit 6. Circuit 6 1NOD1calls & to the capacitor 3, the SOURCE of the EHTELON (NO-current 7. At the same time, discharge (discharge) occurs. It is spun and the capacitor 3 is a differential reference and bias packs during a time equal to the duration of the pulse of the unit 5. Then the 6 oT circuit | Turns on and the process repeats.

At | V3. Changes at (TimeH | And the output signal of the output signal of differential electric signal 1 in each cycle, the trigger voltage of the element MfiiHTa 4 changes.

This leads to a deviation of the output frequency, proportional to cKOpocTin 1 out: change-and-OUT signal 1I1stechno, ik of differentiated electrical () sigal-a /.

Prev Met of o i6 p ate e "and l

A frequency-impedance differentiating device containing an input source that connects a current-frequency converter to a pulse frequency that is isolated and “closed”

A capacitor connected to the bias current source and through a switch controlled from the output of the duration and impulse duration unit to 1 and the reference current source, and

The moporoiBOM element is connected to the input of the norm block for the duration of the mt pulses, characterized in that for the purpose of wiRO, scaling and device and increasing the accuracy of the differential | Iro; vania, the porous element is connected between the comparing factor and the input source.

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