CN2368056Y - Real-time signal integral processing instrument - Google Patents

Abstract

The utility model relates to a real-time signal integral processing instrument which is composed of a microprocessor, and an accumulator and a timer which are controlled by the microprocessor, a digital display unit, an A/D conversion circuit, etc. The utility model fundamentally overcomes the defects of an instrument simulating a circuit and capacitor integral method, provides an instrument for digitally integrating for input signals by the microprocessor, and is a digital integrator with small error, and especially, the utility model can be used for magnetic flux measuring instruments.

Description

Live signal Integral Processing instrument

The utility model relates to live signal Integral Processing instrument.

The core component of existing live signal Integral Processing instrument is linear discharge circuit and integrating capacitor.Because bias current is difficult for eliminating and capacity cell and imperfect, this integral operation can occur inevitably climbing and moves phenomenon, leakage phenomenon, adsorption phenomena and hysteresis phenomenon, cause very mistake for the result of integral operation, in order to reduce the error of existing integrating circuit, all to compensate integrating circuit, but finally still can't eliminate error to increase nonlinear element or network.The integrating instrument that utilizes analogy method to handle is as magnetic flux meters.This instrument is used for the electromotive force of measuring the inductive coil induction is carried out time integral, thereby corresponding to the performance of magnetic material.And the error of existing this class integrating instrument is bigger, even can't calibrate the measurement with absolute magnitude, can only carry out relative value and relatively judge.This mainly is to make integration output terminal output rising (even when not having input signal) because the input bias current that factors such as capacity fall off cause flows through integrating capacitor, time, longer then error was bigger, even when continuous coverage, still will constantly return to zero, can't guarantee measuring accuracy at all.Referring to Fig. 1, wherein amplifier is T1, and integrating capacitor is C1.

The purpose of this utility model be fundamentally eliminate above-mentioned analogy method instrument intrinsic drawback, a kind of instrument that signal is carried out digital integration with microprocessor is provided; The purpose of this utility model especially provides a kind of magnetic-flux measurement instrument that is used for.

The purpose of this utility model is achieved in that a kind of live signal Integral Processing instrument, comprise formations such as operation amplifier circuit, it is characterized in that also being provided with the totalizer of microprocessor and control thereof and timer, digital display unit, the A/D change-over circuit is formed, the signal input connects the amplifier input end, operational amplifier output terminal connects the A/D change-over circuit, the output of A/D change-over circuit connects totalizer, the timer of microprocessor and control thereof connects totalizer signal controlling end, and totalizer output connects digital display driver unit.

The course of work of the present utility model is as follows: signal input is through amplifying after A/D is converted into totalizer, and adding up of totalizer finish integration after timing is demarcated, and integral result exports numeral to and shows or other output display device.

The utlity model has following characteristics:

The utility model fundamentally eliminate mimic channel capacitance integral method instrument intrinsic deficiency, a kind of method of input signal being carried out digital integration with microprocessor is provided; Be a kind ofly to overcome existing integrating circuit and produce and climb the digital integration instrument that moves equal error; Especially can be used to make a kind of magnetic-flux measurement instrument.

The utility model is described in further detail below in conjunction with accompanying drawing and by embodiment:

Fig. 1 is a prior art analog integrator circuit synoptic diagram

Fig. 2 is the utility model structured flowchart

Fig. 3 is the utility model circuit embodiments synoptic diagram

Fig. 4 is the utility model microprocessor work flow chart

As described in Fig. 2-4, the course of work of the present utility model in Fig. 4 integration software flow pattern,

1.IO mouthful setting, timer conter is provided with working method, adopts the interrupt mode reading of data, and the workspace zero clearing shows zero setting.

Interrupt 2.A/D finish to produce, carry out data accumulation, data-switching.

3. the validity of judgment data effectively then begins to carry out integral operation as data, and its time interval is provided with in initialize routine.The lower limit in the general time interval is more than 100 microseconds, and the utility model is got 400 microseconds, and the precision that the upper limit in the time interval can visual equipment need be set, and does not generally have very big restriction.But,, then can make the corresponding decline of precision of instrument if during large interval.

4. finish when system detects integration, when promptly accumulative total is zero, the result is exported.

5. whether the judgement symbol position is automated manner, as system reset after then showing 3 seconds for automated manner, enters first step, as is manual mode, and then display result keeps for a long time.

The implementation procedure of integral operation:

1. judge that integration begins

2.A/D image data accumulative total

3. EOC produces and interrupts

4. ten six--decimal system conversion

5. the A/D transformation result is averaged

6. repeating above-mentioned 2-5 process, is zero or integration end mark up to detecting A/D.

7. total amount and time interval Δ t are multiplied each other, obtain integral result

8. the result is exported;

In Fig. 3 circuit embodiments, only provide the basic comprising of integrating circuit, so with the circuit diagram of digital integration fine measuring instrument.The present embodiment circuit is again the circuit of magnetic flux meters, equally also is the circuit of other digital integration precision measuring instrument.As shown in the figure, the electromotive force Vi of input is amplified by operational amplifier 7650, output V0, deliver to 0801 input end of analog signal Vin (+) and carry out the A/D conversion, transformation result (digital quantity) is delivered to 2051 single-chip microcomputer P1 ports (P1.0-P1.7), EOC sign INTR triggers the look-at-me INT0 of single-chip microcomputer, realizes Data Receiving, processing and computing by software, finishes integration work.Integral result is sent to the data input pin D of display driver piece 14499 by serial port data sending terminal Rxd, through decoding, drive by the LED charactron in real time, dynamic display result.Information is delivered to display driver piece 14499 by 2051 serial ports, and integral result is shown in real time.

When this device constitutes magnetic flux meters, as long as insert by the electric signal of flux change generation and to its integration at input end.

Claims (3)

1. live signal Integral Processing instrument, comprise formations such as operation amplifier circuit, it is characterized in that also being provided with compositions such as the totalizer of microprocessor and control thereof and timer, digital display unit, A/D change-over circuit, the signal input connects the amplifier input end, operational amplifier output terminal connects the A/D change-over circuit, the output of A/D change-over circuit connects totalizer, and the timer of microprocessor and control thereof connects totalizer signal controlling end, and totalizer output connects digital display driver unit.

2. by the described live signal Integral Processing of claim 1 instrument, it is characterized in that connecting the data input pin (D) of display driver circuit (14499), and connect decoding, driving circuit connection charactron (LED) from totalizer output terminal (Rxd).

3. by the described live signal Integral Processing of claim 1 instrument, it is characterized in that this device constitutes magnetic flux meters.

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