CN207164126U - Peak value and excessively peak moment tracing detection circuit - Google Patents

Abstract

The utility model discloses peak value and peak moment tracing detection circuit is crossed, including：Voltage comparator, in-phase amplifier, sampling hold circuit, drive circuit, sampling hold circuit include：Resistance, voltage follower, controlled switch, holding circuit, the voltage of voltage follower track and hold circuit, i.e. voltage follower output voltage is equal to the voltage of holding circuit, and voltage comparator compares the output voltage signal and the voltage signal U of tracing detection circuit input of in-phase amplifier_in, output of the comparative result through voltage comparator removes to control the drive circuit, and drive circuit control controlled switch is turned on or off, and the circuit is directly to voltage signal U_inMagnitude of voltage detected and compared, rather than to voltage signal U_inWaveform handled, with voltage signal U_inWaveform it is not related, so as to avoid the introducing of the nonlinear circuits such as differential, improve the precision and reliability of tracing detection circuit.

Description

Peak value and excessively peak moment tracing detection circuit

Technical field

A kind of electronic circuit technology field is the utility model is related to, more specifically to peak value and crosses the tracking inspection of peak moment Slowdown monitoring circuit.

Background technology

Peak voltage detection circuit is as a kind of basic circuit of detectable voltage signals waveform peak to nuclear radiation detector It is essential, it is often used in high-energy physics and nuclear physics spectral measurement and time spectrometry.In addition pressed in measurement Power, acceleration, magnetic flux detector in also to use this circuit.In a word, it is every to be converted to physical quantity or chemical quantity During electric signal, this circuit is typically necessary.Therefore, peak voltage detection circuit is applied very wide in terms of data sampling, very Need collection peak value to be as a result worth in multisystem to be handled, generally require to obtain in this process and accurately spend the peak moment To ensure the data accuracy of collection and reliability.And signal waveform is random in real work, particularly in signal Waveform is mostly acyclic in detecting system, and size and cycle are all constantly changing, and the judgement to peak value moment is brought Inconvenience.

Voltage signal peak value and excessively peak moment measuring circuit are the cores of signal data acquisition in basic electric quantity test instrument Circuit, traditionally mainly there are two kinds of measuring methods.It is a kind of be the peak value of voltage-type and cross peak moment measuring circuit, another kind be across The peak value of conductivity type and excessively peak moment measuring circuit.Although the peak value of transconductance type and peak moment measuring circuit performance excessively are better than voltage-type , but two methods integral nonlinearity is all bigger, in order to improve the linear properties of circuit, it is necessary to as big as possible electric capacity, and The result for increasing electric capacity is to reduce the passband and Slew Rate of circuit, circuit is diminished the responding range of signal.And mistake The measurement at peak moment is then completed using differential circuit and zero passage voltage comparator, and its principle is that tested waveform passes through differential circuit Crest is converted to zero crossing afterwards, and zero passage voltage comparator is that high level is converted at zero in magnitude of voltage.Crest value is corresponding by low electricity High level change is put down, this level change that subsequent conditioning circuit detects thinks that peak value arrives, while starts to peak detection circuit The peak value of output measures.But this circuit reliability depends not only on differential circuit stability, and depending on being detected letter Number waveform, false triggering is easily caused to some slow pickup electrodes of change, has a strong impact on measurement result.

Utility model content

The purpose of this utility model is to provide a kind of strong antijamming capability, excessively high-precision, high reliability peak value and peak Moment tracing detection circuit.

The solution that the utility model solves its technical problem is：Including：Voltage comparator, in-phase amplifier, sampling Holding circuit, drive circuit, the sampling hold circuit include：Resistance, voltage follower, controlled switch, holding circuit, it is described Holding circuit is made up of an electric capacity, peak value and the input voltage signal U for crossing peak moment tracing detection circuit_inFrom the resistance One end inputs, and the other end of the resistance is connected to one end of the controlled switch, and the other end of the controlled switch is connected to The in-phase input end of the voltage follower and one end of electric capacity, the other end of the electric capacity connect over the ground, the holding circuit For keeping the tracing detection circuit input voltage signal U when controlled switch disconnects after controlled switch disconnection_in's Magnitude of voltage, the voltage follower track the voltage of the holding circuit, i.e., described voltage follower output voltage is equal to described The voltage of holding circuit, the output end of the voltage follower are connected with the in-phase amplifier and the inverting input of itself, The output end of the in-phase amplifier is connected with the inverting input of the voltage comparator, the tracing detection circuit input electricity Press signal U_inBe connected with the in-phase input end of the voltage comparator, the voltage comparator in-phase amplifier it is defeated Go out voltage signal and tracing detection circuit input U_inVoltage signal, output of the comparative result through the voltage comparator goes The drive circuit is controlled, the drive circuit controls being turned on or off for the controlled switch.

Further, the in-phase amplifier includes：Operational amplifier, first resistor, second resistance, the operational amplifier Output end be connected to the inverting input of the voltage comparator and one end of first resistor, the other end of the first resistor The in-phase input end of the operational amplifier and one end of second resistance are connected to, the other end and the ground of the second resistance connect Connect, the inverting input of the operational amplifier is connected with the output end of the voltage follower, the resistance of the first resistor Much smaller than the resistance of the second resistance, compared with the in-phase amplifier realizes hysteresis voltage together with the voltage comparator Function.

The beneficial effects of the utility model are：The utility model is kept using voltage comparator, in-phase amplifier and sampling Circuit cooperates, directly to voltage signal U_inMagnitude of voltage detected and compared, rather than to voltage signal U_inWaveform Handled, with voltage signal U_inWaveform it is not related, so as to avoid the introducing of the nonlinear circuits such as differential, improve with Track detects the precision and reliability of circuit.

Brief description of the drawings

, below will be to needed for embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model The accompanying drawing to be used is briefly described.Obviously, described accompanying drawing is part of the embodiment of the present utility model, rather than entirely Portion's embodiment, those skilled in the art on the premise of not paying creative work, can also obtain it according to these accompanying drawings His design and accompanying drawing.

Fig. 1 is the utility model peak value and the circuit diagram for crossing peak moment tracing detection circuit；

Fig. 2 is the input waveform of the utility model peak value and mistake peak moment tracing detection circuit and the relation of output waveform Figure.

Embodiment

Design, concrete structure and caused technique effect of the present utility model are carried out below with reference to embodiment and accompanying drawing Clear, complete description, to be completely understood by the purpose of this utility model, feature and effect.Obviously, described embodiment It is part of the embodiment of the present utility model, rather than whole embodiments, based on embodiment of the present utility model, the skill of this area The other embodiment that art personnel are obtained on the premise of not paying creative work, belong to the model of the utility model protection Enclose.In addition, all annexations being previously mentioned in text, not single finger element directly connects, and refer to can according to specific implementation feelings Condition, by adding or reducing connecting element, to form more excellent circuit structure.Each technical characteristic in the invention, Can be with combination of interactions on the premise of not conflicting conflict.

Embodiment 1, with reference to figure 1, term is explained：U_inBe tracing detection circuit input voltage signal, U_BVoltage ratio compared with The voltage signal of device b5 outputs, U_outIt is the voltage signal of sampling hold circuit b2 outputs, and the electricity of tracing detection circuit output Press signal, U_CIt is in-phase amplifier to U_outVoltage signal after amplification.

A kind of peak value and excessively peak moment tracing detection circuit, including：Voltage comparator b5, in-phase amplifier b1, sampling are protected Circuit b2, drive circuit are held, the sampling hold circuit b2 includes：Resistance R, voltage follower b4, controlled switch S, holding electricity Road b3, the holding circuit b3 are made up of an electric capacity C, and one end of the electric capacity C is same mutually defeated with the voltage follower b4's Entering end and controlled switch S other end connection, the other end of the electric capacity C is connected to ground, when controlled switch S disconnects, electric capacity C Keep tracing detection circuit input voltage signal U during controlled switch S disconnections_inMagnitude of voltage, voltage follower b4 tracking electric capacity C Voltage, i.e., described voltage follower output voltage be equal to electric capacity C voltage.

The in-phase amplifier b1 includes：Operational amplifier A₂, first resistor △ R₁, second resistance R₁, the operation amplifier Device A₂Output end be connected to the inverting input and first resistor △ R of the voltage comparator b5₁One end, it is described first electricity Hinder △ R₁The other end be connected to the operational amplifier A₂In-phase input end and second resistance R₁One end, it is described second electricity Hinder R₁The other end be connected to ground, the operational amplifier A₂Inverting input and the voltage follower b₄Output end connect Connect, in the present embodiment, the first resistor △ R₁Resistance be second resistance R₁Resistance one thousandth, it is described with mutually amplify Device b1 realize hysteresis voltage together with the voltage comparator b5 compared with function.

The in-phase input end input peak value of the voltage comparator b5 and the input voltage for crossing peak moment tracing detection circuit Signal U_in, the voltage comparator b₅Inverting input be connected with the output end of the in-phase amplifier.

The operation principle of the present embodiment is：Under original state, input voltage signal U is detected_in≤ 0, now sampling is kept Circuit b2 exports U_out=0, voltage signal U is obtained after in-phase amplifier amplifies_C, voltage signal U_CIt is added to voltage comparator b5 Inverting input, now U_C>=0, determined by the property of in-phase amplifier, the amplification coefficient of in-phase amplifier is permanent to be more than 1.Electricity Comparator b5 output low levels are pressed, the low level disconnects the switch S in sampling hold circuit b2 through drive circuit, keeps sampling Holding circuit b2 exports U_out=0, now sampling hold circuit b2 in keep working condition.It should be noted that the drive Dynamic circuit is prior art.

As the voltage signal U of tracing detection circuit input_inWaveform as shown in Figure 2, U_in>0 and it is more than voltage U_CWhen, voltage Comparator b5 upset output high level, the high level close the switch S in sampling hold circuit b2 through drive circuit, tracking inspection The voltage signal U of slowdown monitoring circuit input_inDischarge and recharge is carried out to electric capacity C through resistance R, because voltage follower b4 input resistance is infinite Greatly, the voltage on electric capacity C is equal to the voltage signal U of tracing detection circuit input_in, i.e., the voltage-tracing detection circuit on electric capacity C Input voltage signal U_in, because voltage follower b4 amplification coefficient is 1, the change of voltage follower b4 output tracking input Change, namely sampling hold circuit b2 output voltage U_outTrack the voltage signal U of tracing detection circuit input_in, change resistance R Size can change tracking velocity, now sampling hold circuit b2 is in sampling work state, until U_inIn t₁Moment There is first peak value U_h1, now U_out=U_h1The U after in-phase amplifier amplifies_C≥U_h1, i.e. U_C>U_in, voltage comparator b5 turns over Low level is transferred out, the low level disconnects the switch S in sampling hold circuit b2 through drive circuit, and sampling hold circuit b2 is defeated Go out U_out=U_h1, in t₁To t₂' this period, due to U_inIt is consistently less than U_h1, voltage comparator b5 do not overturn, sampling hold circuit B2, which is in, keeps working condition, and sampling hold circuit b2 outputs keep U_out=U_h1；Work as U_inIt is more than U again_h1When, sampling hold circuit B2 is in sampling work state again, until another peak value U_h2Occurring, sampling hold circuit b2 is in and keeps working condition again, Circuit is operated the peak value for tracking detected input voltage signal and spends the peak moment successively.For Fig. 2 shown in, U_BIn t₁ ~t₂'、t₂~t₃'、t₃In~this three times afterwards, sampling hold circuit b2, which is in, keeps working condition, and corresponding sampling is protected Hold circuit b2 output voltage U_outIt is U_inThree peak value U_h1, U_h2And U_h3.0~t₁、t₂'~t₂、t₃'~t₃This three times Interior, sampling hold circuit b2 is in sampling work state.t₁,t₂And t₃It is the peak moment, that is, realize excessively of these three peak values Peak value and excessively peak moment tracing detection.

Prevent from being superimposed upon U to improve measurement accuracy_inUpper small interference signal causes false triggering, and tracing detection circuit utilizes Function compared with realizing hysteresis voltage together with voltage comparator with phase operational amplifier.If U_hnIt is U_inPresent peak value, U_h(n+1)It is U_inNext peak value, then U_C=U_hn+ Δ U, only works as U_in≥U_C=U_hnDuring+Δ U voltage comparator b5 overturn, go with Track U_h(n+1), rather than U_in≥U_hnWhen voltage comparator b5 upset go to track U_h(n+1), that is to say, that U_inOn interference signal be less than During Δ U, circuit, which will not be overturn, is tracked measurement, hereResistance △ R₁Resistance be resistance R₁Resistance A very small part, resistance △ R in the present embodiment₁For resistance R₁Resistance one thousandth.

This tracing detection circuit make use of the linear electricity such as voltage comparator b5, in-phase amplifier b1, sampling hold circuit b2 Road is to voltage signal U_inDetection is tracked, and is used and tracing detection circuit input voltage signal U_inDirect comparison voltage The method of value, determines peak value and peak value moment, during trace detection, is not related to voltage signal U_inThe place of waveform Reason, and with voltage signal U_inWaveform it is not related, so as to avoid the introducing of the nonlinear circuits such as differential, improve tracking Detect the precision and reliability of circuit.

Better embodiment of the present utility model is illustrated above, but the invention be not limited to it is described Embodiment, those skilled in the art can also make a variety of equivalent changes on the premise of without prejudice to the utility model spirit Type or replacement, these equivalent modifications or replacement are all contained in the application claim limited range.

Claims (2)

1. peak value and excessively peak moment tracing detection circuit, it is characterised in that including：Voltage comparator, in-phase amplifier, sampling are protected Circuit, drive circuit are held, the sampling hold circuit includes：Resistance, voltage follower, controlled switch, holding circuit, the guarantor Hold circuit to be made up of an electric capacity, peak value and the input voltage signal U for crossing peak moment tracing detection circuit_inFrom the one of the resistance End input, the other end of the resistance are connected to one end of the controlled switch, and the other end of the controlled switch is connected to institute The in-phase input end of voltage follower and one end of electric capacity are stated, the other end of the electric capacity is connected over the ground, and the holding circuit is used Tracing detection circuit input voltage signal U when keeping the controlled switch to disconnect after controlled switch disconnection_inElectricity Pressure value, the voltage follower track the voltage of the holding circuit, i.e., described voltage follower output voltage is equal to the guarantor The voltage of circuit is held, the output end of the voltage follower is connected with the in-phase amplifier and the inverting input of itself, institute The output end for stating in-phase amplifier is connected with the inverting input of the voltage comparator, the tracing detection circuit input voltage Signal U_inIt is connected with the in-phase input end of the voltage comparator, the output of the voltage comparator in-phase amplifier Voltage signal and tracing detection circuit input U_inVoltage signal, output of the comparative result through the voltage comparator goes to control The drive circuit is made, the drive circuit controls being turned on or off for the controlled switch.

2. peak value according to claim 1 and excessively peak moment tracing detection circuit, it is characterised in that：The in-phase amplifier Including：Operational amplifier, first resistor, second resistance, the output end of the operational amplifier are connected to the voltage comparator Inverting input and first resistor one end, the other end of the first resistor is connected to the same mutually defeated of the operational amplifier Enter end and one end of second resistance, the other end of the second resistance is connected to ground, the inverting input of the operational amplifier Be connected with the output end of the voltage follower, the resistance of resistance≤second resistance of the first resistor thousand/ One, the in-phase amplifier realize hysteresis voltage together with the voltage comparator compared with function.