CN201754225U - Intelligent fault-tolerance fault safe acquisition board card - Google Patents

Abstract

The utility model discloses an intelligent fault-tolerance fault safe acquisition board card, which comprises a microcomputer controller and an acquisition circuit, wherein the microcomputer controller comprises two CPUs which are connected in parallel, the acquisition circuit comprises an exclusive-or logic circuit, an output end of the exclusive-or logic circuit is respectively connected with the two CPUs, and the two input ends respectively are a pulse wave input end and a collected direct current component input end. On one hand, pulse waves and collected direct current components do exclusive-or operation, and collected data is alternating current which has a certain phase relation with output pulse, thereby achieving the design purpose of safe fault guidance. On the other hand, the microcomputer controller comprises two CPUs which are connected in parallel, thereby further guaranteeing the reliability of collected signals.

Description

Intelligent fault-tolerance failure safe analog input card

Technical field

The utility model relates to a kind of signal pickup assembly, relates in particular to a kind of intelligent fault-tolerance failure safe analog input card.

Background technology

In recent years, along with the fast development of track traffic, more and more higher to the safety requirements of its opertaing device.And along with the significantly raising of train speed, " fault-safety principle " promptly when equipment broke down, equipment can in time be found fault, and a side of failure to the safe side, avoid the generation of dangerous situation, very big variation has also taken place in the notion of such a kind of " fault-safety principle ".The notion of fault-safety principle of the prior art is that in a single day opertaing device breaks down and can cut off the electricity supply by the whole audience, the speed of a motor vehicle is very fast at present, in the very fast speed of a motor vehicle in this case, the whole audience is cut off the electricity supply and certainly will be caused bullet train to stop in emergency, and so also can cause serious accident.

In the prior art, all cut off the I/O power supply with relay during the opertaing device fault, exist like this and cut off insecure hidden danger, secondly there is swinging cross output hidden danger in the opertaing device I/O before, be the circuit series-parallel connection make the mistake output safeguard function extremely thin a little less than, in case the circuit swinging cross is exported both dangerously, swinging cross will drive does not answer relay picked up to pick up, control that makes the mistake and startup, if such situation occurs in track switch, will cause track switch rotation, consequence is very serious; If occur in the circuit of railway section signal, the relay of malfunction can be given the information of release-locking device error of transmission, can cause very serious consequence equally.

The utility model content

The purpose of this utility model provides a kind of safe and reliable intelligent fault-tolerance failure safe analog input card.

The purpose of this utility model is achieved through the following technical solutions:

Intelligent fault-tolerance failure safe analog input card of the present utility model comprises microcomputerized controller and Acquisition Circuit, and described microcomputerized controller comprises the CPU of two parallel connections, and described Acquisition Circuit comprises XOR circuit;

The output terminal of described XOR circuit is connected with two CPU respectively, and two input ends are respectively the DC quantity input end of pulsating wave input end and collection.

The technical scheme that provides by above-mentioned the utility model as can be seen, intelligent fault-tolerance failure safe analog input card described in the utility model because microcomputerized controller comprises the CPU of two parallel connections, Acquisition Circuit comprises XOR circuit; The output terminal of XOR circuit is connected with two CPU respectively, and two input ends are respectively the DC quantity input end of pulsating wave input end and collection.The DC quantity of pulsating wave and collection is carried out XOR on the one hand, and the data that collect like this are exactly the of ac that certain phase relation is arranged with the output pulse, reaches the purpose of design of fault-safety principle; On the other hand, microcomputerized controller comprises the CPU of two parallel connections, has further guaranteed the reliability of acquired signal.

Description of drawings

Fig. 1 is the circuit general structure synoptic diagram of the utility model intelligent fault-tolerance failure safe analog input card;

Fig. 2 is the structural representation of the specific embodiment of Acquisition Circuit in the utility model;

Fig. 3 is when DA is unsettled in the utility model, the comparison of wave shape synoptic diagram of DAT and PB;

Fig. 4 for DA in the utility model connect-during 24V, the comparison of wave shape figure of DAT and PB.

Embodiment

Intelligent fault-tolerance failure safe analog input card of the present utility model, its preferable embodiment comprises microcomputerized controller and Acquisition Circuit as shown in Figure 1, and described microcomputerized controller comprises the CPU of two parallel connections, and described Acquisition Circuit comprises XOR circuit;

The output terminal of described XOR circuit is connected with two CPU respectively, and two input ends are respectively the DC quantity input end of pulsating wave input end and collection.The output terminal of XOR circuit can be connected with the impact damper of described CPU.

Described Acquisition Circuit has separate multichannel, such as 32 tunnel separate Acquisition Circuit are arranged.

Can communicate to connect between two CPU.This intelligent fault-tolerance failure safe analog input card also comprises safety power supply.

XOR circuit can adopt any XOR circuit of the prior art.Also can adopt XOR circuit as shown in Figure 2.

As shown in Figure 2, the pulsating wave input end of XOR circuit is connected with the output terminal of described XOR circuit by first switching tube (Q1), first photo-coupler (PCT1), second photoelectrical coupler (PCT2), second switch pipe (Q2), the 3rd photo-coupler PCT3 successively;

Be connected with diode (D1) between the collection utmost point of the emitter-base bandgap grading of second photo-coupler (PCT2) and second switch pipe (Q2), the DC quantity input end of the collection of described XOR circuit is connected between second photo-coupler (PCT2) and the diode (D1), and is connected with the 24V power supply by voltage stabilizing diode (TVS1).

Again referring to Fig. 1, Fig. 2, in the utility model, microcomputerized controller is made of CPUA and the two CPU of CPUB, two CPU control the multi pass acquisition signal jointly, and the Acquisition Circuit of each road acquired signal adopts the XOR collection, pulsating wave of single-chip microcomputer output, the DC quantity of this pulsating wave and collection is carried out XOR, the data that collect like this are exactly the of ac that certain phase relation is arranged with the output pulse, have as seen just reached the purpose of design of fault-safety principle, and 32 tunnel acquisition principle are the same.

Acquisition Circuit comprises 3 port: PB0, DA1 and DAT1.Wherein, PB0 is connected with the pulse delivery outlet of single-chip microcomputer, and DA1 is connected with collection terminal, and DAT1 is connected with the impact damper of CPU.

Acquisition Circuit comprises photo-coupler PCT1, PCT2, PCT3, switching tube Q1, Q2, resistance R 1～R10, diode D1 and voltage stabilizing diode TVS1 etc.

The PB0 end is connected with the DAT1 end with PCT2, switching tube Q2, photo-coupler PCT3 by switching tube Q1, photo-coupler PCT1 successively; Be connected with diode D1 between the collection utmost point of the emitter-base bandgap grading of photo-coupler PCT2 and switching tube Q2; The DA1 end is connected between photo-coupler PCT2 and the diode D1, and is connected with the 24V power supply by voltage stabilizing diode TVS1.

The logic analysis of XOR Acquisition Circuit:

(1) DA1 is unsettled:

PB0 exports high:

Triode Q1 (positive-negative-positive triode) ends, not conducting of optocoupler PCT1, and not conducting of PCT2, Q2 (positive-negative-positive triode) ends, not conducting of PCT3, input DAT is low.

PB0 output is low:

Triode Q1 base emitter-base bandgap grading is anti-inclined to one side, the Q1 conducting, and the PCT1 conducting, the PCT2 conducting, the PCT3 conducting, DAT imports high.

(2) DA1 receives-24V:

PB0 exports high:

Triode Q1 ends, PCT1, and not conductings of PCT2, Q2 ends, the PCT3 conducting, DAT is input as height.

PB0 output is low:

Triode Q1 conducting, the PCT1 conducting, the PCT2 conducting, PCT3 has a very short moment conducting, Q2 conducting, the emitter potential of Q2 is 24VGND-(0.2V～0.5V), at this moment the voltage that is clipped in PCT3 light emitting diode two ends has only 0.2V～0.5V, and the forward voltage 1.15V of light emitting diode is so light emitting diode is can not conducting luminous, PCT3 ends, and DAT is input as low.

It is as shown in the table that the analysis and summary result draws XOR:

It is perfect that above-mentioned XOR circuit has structure, control rigorous, stable and reliable operation, fault can in time be found and the advantage of failure to the safe side.Wherein PCT1, PCT2, PCT3 select Light Coupled Device TP521-1GB for use, R1 is 2.2K ohm Chip-R, R2, R3 are 510 ohm of Chip-Rs, R4 is 5.1K ohm Chip-R, and R5, R6, R7 are 62 ohm of Chip-Rs, and R8 is 10K ohm surface-mount resistor, R9, R10 are 3.3K ohm Chip-R, Q1, Q2 are MMBT5401 low speed NPN switching tube, and D1 is Surface Mount diode M7, and voltage stabilizing diode TVS1 is 1.5KE43A.

As shown in Figure 3, Figure 4, in the utility model, two CPU control one or more acquired signal jointly, Acquisition Circuit adopts the XOR collection, pulsating wave of single-chip microcomputer output, the DC quantity of this pulsating wave and collection is carried out XOR, and the data that collect like this are exactly the of ac that certain phase relation is arranged with the output pulse, has as seen just reached the purpose of design of fault-safety principle; On the other hand, microcomputerized controller comprises the CPU of two parallel connections, has further guaranteed the reliability of acquired signal.Through test and on probation, effect is very good, has improved the security of equipment greatly, well satisfies the requirement of fault-safety principle.

The above; it only is the preferable embodiment of the utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.

Claims (6)

1. an intelligent fault-tolerance failure safe analog input card is characterized in that, comprise microcomputerized controller and Acquisition Circuit, described microcomputerized controller comprises the CPU of two parallel connections, and described Acquisition Circuit comprises XOR circuit;

The output terminal of described XOR circuit is connected with two CPU respectively, and two input ends are respectively the DC quantity input end of pulsating wave input end and collection.

2. intelligent fault-tolerance failure safe analog input card according to claim 1 is characterized in that the output terminal of described XOR circuit is connected with the impact damper of described CPU.

3. intelligent fault-tolerance failure safe analog input card according to claim 2 is characterized in that, described Acquisition Circuit has separate 32 the tunnel.

4. intelligent fault-tolerance failure safe analog input card according to claim 3 is characterized in that, communicates to connect between described two CPU.

5. according to each described intelligent fault-tolerance failure safe analog input card of claim 1 to 4, it is characterized in that the pulsating wave input end of described XOR circuit is connected with the output terminal of described XOR circuit by first switching tube (Q1), first photo-coupler (PCT1), second photoelectrical coupler (PCT2), second switch pipe (Q2), the 3rd photo-coupler (PCT3) successively;

Be connected with diode (D1) between the collection utmost point of the emitter-base bandgap grading of second photo-coupler (PCT2) and second switch pipe (Q2), the DC quantity input end of the collection of described XOR circuit is connected between second photo-coupler (PCT2) and the diode (D1), and is connected with the 24V power supply by voltage stabilizing diode (TVS1).

6. according to each described intelligent fault-tolerance failure safe analog input card of claim 1 to 4, it is characterized in that this intelligent fault-tolerance failure safe analog input card also comprises safety power supply.

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