CN2278966Y - Electrical switch group opto-electric isolated data acquisition and display effictive interface - Google Patents

Abstract

The utility model relates to an efficient interface for electrical switch group photoelectric isolation data acquisition and display, which belongs to the field of the electronic technology and computer application. The utility model aims to enhance the effect of a batch switching value data acquisition interface. The utility model is composed of a TD plate, a photoelectric isolating interface circuit, a photoelectric isolating power supply, a plug and a socket, the utility model needs only m photoelectric electronic isolated switches and n photoelectric isolating circuits to provide hardware support for the photoelectric isolation type data acquisition for the on-off state of m*n electrical switches of a computer. The utility model has the advantages of powerful functions, wide applicability, convenient operation, high durability and low cost. The utility model can be used for industrial control and the field of detection.

Description

Electric switch group photoelectricity buffer data acquisition and the efficient interface of demonstration

The utility model relates to a kind of computer carries out photoelectric-isolated data acquisition and light emitting diode (being called for short LED) demonstration to the on off operating mode of a collection of electric switch high-effect interface, mainly belong to electronic technology field, and relate to computer some general knowledge in Industry Control and context of detection application.

Up to the present, the on-off value data acquisition technology, photoelectric isolation technology and LED display technique are respectively in a lot of applications for many years, but how with the integrated application better of these technology, and how to make it have the usefulness of adaptability and Geng Gao widely, still be worth so far continuing to inquire into and research.The data acquisition plug-in card of the on off operating mode of the electric switch of selling in the market that supplies usefulness such as production line automatic measuring and controlling system, industrial computer and PLC remains in unsatisfactory part, and it is convenient inadequately for example to detect or keep in repair; The on-state equivalent resistance of electric switch is required quite strict, be unfavorable for oxidized easily or used for a long time by occasions such as dust pollutions easily at switch contact; Anti-220V～accidental shock ability is strong inadequately and price is more high.Prior art document and the data close with the utility model have: " the single-chip microcomputer application technology a collection of selected materials (1) " what upright democracy is compiled, (publishing house of BJ University of Aeronautics ﹠ Astronautics 1993 February the 1st edition), " industrial control computer " periodical in 95 years to 96 years, technical information such as the IO plug-in card of PLC and STD.

The purpose of this utility model is to provide a kind of high-effect interface to the computer that is used for Industry Control or detection (comprising with the single-chip microcomputer being micro computer, industrial control computer, universal microcomputer of core etc.), the computer interface of a kind of " components and parts are few; cost is low; can be used for disperseing the data acquisition of the switching value of electric switch group on off operating mode within the specific limits; isolate with computer photoelectricity; each electric switch all has corresponding LED to show its on off operating mode; installation, debugging and easy to maintenance, wide adaptability, durable in use " promptly is provided.

To the effect that of the present utility model: it is by " being welded with connecting terminal block, current-limiting resistance R _LC, LED circuit board " TD plate, " photoelectricity isolating interface circuit " ISO, photoelectricity insulating power supply and plugs and sockets form.Each electric switch is connected to terminal row on the TD plate by external wire, and m * n SRL branch road (their available symbols SRL can be arranged on the TD plate _1-1To SRL _M-nExpression, its general symbol(s) can be write as SRL _X-Y, wherein m, n, X and Y are the natural numbers in 4 to 32 scopes, and X≤m, m photoelectricity insulating electron switch A among the Y≤n), they and ISO ₁To A _mWith n photoelectricity coupled circuit B ₁To B _nLink to each other, i.e. SRL _1-YTo SRL _M-YInput meet A respectively ₁To A _mOutput, SRL _X-1To SRL _X-nOutput meet B respectively ₁To B _nInput.Each SRL branch road is respectively by an external electric switch, a R _LCBe connected in series with one to three LED, wherein LED can be external near the electric switch or on the panel of electrical equipment, also can be welded on the TD plate.M photoelectricity insulating electron switch A ₁To A _mCircuit theory can be identical, promptly it can be by " circuit that field effect transistor output type photoelectrical coupler or function are identical with it " and resistance R _A1, diode D _A1Constitute, wherein the latter two R _A1And D _A1Be serially connected in the former LED input circuit and field effect transistor output loop respectively.N photoelectricity coupled circuit B ₁To B _nCircuit theory can be identical, promptly it can be by general light electric coupler and stabilivolt D _ZB, capacitor C _B, resistance R _B1And R _B2Constitute LED and R in the photoelectrical coupler _B1After the parallel connection again with R _B2Series connection forms a series-parallel circuit, this circuit and C _B, D _ZBTwo element parallel connections.The TD plate links to each other by a cover plug, socket with ISO, and promptly (m+n) root line of TD plate can be connected to plug P _TD, A among the ISO ₁To A _mM root output line and B ₁To B _nN root input (being connected to the LED in each photoelectrical coupler) signal wire can be connected to socket SK _ISO, SK _ISOAlso need external photoelectricity insulating power supply, this power supply can be connected into the formula of floating, both with the center line of civil power (have be called zero line) or insulate greatly, also with the ground wire of computer circuits

Insulation.Work as P _TDInsert SK _ISOThe time, but the utility model operate as normal.P in addition _TDAlso can insert another dedicated test socket SK _Ch, it and SK _ISOModel is identical, but the terminal wiring difference of the two each jack (or contact pin, reed and so on, below analogue is still arranged, no longer repeat specification), particularly, SK _ChOne of connection plan of each jack end is: SK _ChOn the socket " with SK _ISOMeet A on the socket ₁To A _mEach jack of output line is corresponding " the end of each jack connect together, connect the photoelectricity insulating power supply or detect the positive pole of power source special; SK _ChGo up " with SK _ISOMeet B ₁To B _nInput link respectively to connect the hole corresponding " the end of each jack connect together, connect the photoelectricity insulating power supply or detect the negative pole of power source special.With P _TDInsert SK _Ch, then can break away from ISO and computer, TD plate and external electric switch and line thereof etc. are debugged, detected or keep in repair.Particularly, can understand the break-make situation of each corresponding electric switch or line by the bright dark state of observing each LED.As for other details of the present utility model, will further specify in conjunction with the accompanying drawings in the back.

Compared with prior art, advantage and the good effect that the utlity model has mainly contain: 1. it can provide hardware supported for computer carries out data acquisition to electric switch group's on off operating mode, and isolate with the circuit photoelectricity of computer, and each electric switch all has LED to show its on off operating mode; 2. surpass under 95 the prerequisite in external electric switch quantity, the used components and parts of the utility model obviously reduce, and cost obviously reduces; 3. its configure dedicated test socket can debug, detect or keep in repair TD plate and external electric switch and line thereof etc. under the situation that breaks away from photoelectric isolating circuit and computer easily; 4. when the on-state equivalent resistance of electric switch and line thereof during, can support that still computer carries out the normal data collection greatly to 1.5K Ω, therefore applied widely; 5. anti-220V～accidental shock ability is strong; 6. antijamming capability is strong, and is durable in use.

Fig. 1 is one of embodiment block diagram of the present utility model.

Fig. 2 is one of the enforcement circuit block diagram of ISO among Fig. 1.

Fig. 3 be ISO among Fig. 1 the enforcement circuit block diagram two.

Fig. 4 is one of the enforcement circuit diagram of the interior SRL of TD among Fig. 1.

Fig. 5 is among Fig. 1 in the TD two of the enforcement circuit diagram of SRL.

Fig. 6 is among Fig. 1 in the TD three of the enforcement circuit diagram of SRL.

Fig. 7 is among Fig. 1 in the TD four of the enforcement circuit diagram of SRL.

Fig. 8 is B among Fig. 2 and Fig. 3 ₁To B _nOne of enforcement circuit diagram.

Fig. 9 is A among Fig. 2 and Fig. 3 ₁To A _mOne of enforcement circuit diagram.

Figure 10 is A among Fig. 2 and Fig. 3 ₁To A _mThe enforcement circuit diagram two.

Figure 11 is the illustration of single channel equivalent electrical circuit of the present utility model.

Figure 12 is one of embodiment block diagram of linking to each other with the dedicated test socket of TD plate.

Above among each figure with the connection between them of the arabic numeral in the circle or character representation, promptly the point that arabic numeral are identical or character is identical in the circle is corresponding links to each other.The utility model is described in further detail below in conjunction with above-mentioned accompanying drawing.

(1) " PC " represents computer among Fig. 1, and it can be to be the micro computer of core with the single-chip microcomputer, also can be industrial control computer or universal microcomputer; " ISO " is photoelectricity isolating interface circuit, and Fig. 2 and Fig. 3 have described its two kinds of enforcement block diagrams; " P _TD-SK _ISO" be a cover plugs and sockets, its heart yearn radical should be not less than (m+n), P _TDEnd link to each other SK with the TD plate _ISOEnd link to each other with ISO, as for P _TDAnd SK _ISOWhich is a plug, and which is a socket, how easy to use next definite can consider as the case may be.In order to narrate conveniently, in claims and this instructions P _TDSay into plug, SK _ISOWith the SK among Figure 12 _ChSay into socket.Can be connected to m * n SRL branch road among Fig. 1 on the TD plate, the numbering with them among the figure is designated as SRL _1-1To SRL _M-n, they and (m+n) root main line (X ₁To X _mAnd Y ₁To Y _n) be connected into so-called determinant or matrix form circuit.

(2) voltage is designated as V among Fig. 2 and Fig. 3 _ISODirect supply be the photoelectricity insulating power supply that is connected into the formula of floating, it can be external or places in the ISO; Mark "+5V " locate can with computer in+5V links to each other, Fig. 2 gets the bid The place should with the ground wire in the computer

Link to each other.R among these two figure ₁To R _nBe resistance, its resistance can be selected in 4.7K Ω to 10K Ω scope; B ₁To B _nBe the photoelectricity coupled circuit, Fig. 8 is one of their enforcement circuit diagram; A ₁To A _mBe photoelectricity insulating electron switch, Fig. 9 and Figure 10 have described A ₁To A _mTwo kinds implement circuit; Be labeled as A among Fig. 2 and Fig. 3 _S1To A _SmLead-in wire can connect the output of m 74HC type driver respectively, the input end of this m driver can link to each other with the output port that computer has a latch function, or link to each other with the output of code translator, the input of code translator can connect the output of data latches, and computer instruction should make A _S1To A _SmOne of be low level, could carry out data acquisition to the on off operating mode of corresponding electric switch.When not carrying out data acquisition, A _S1To A _SmCan all be low level or, just can make the S that is in on-state for high-low level alternate (showing similar) with scanning _wThe LED of corresponding (being in series) is bright state or blink states.B among Fig. 2 ₁To B _nOutput D ₀To D _N-1Can link to each other with I/O data bus in the computer through tri-state switch; Fig. 3 D that gets the bid ₀To D ₇Lead-in wire can link to each other and Fig. 3 A that gets the bid with I/O two-way three-state data bus driver in the computer 245 is corresponding one by one _Sb1And A _Sb2Deng lead-in wire can connect the output of 74HCTO5, when needing data acquisition, computer instruction should make A _Sb1And A _Sb2Deng timesharing is low level one by one.When not carrying out data acquisition, the output of 74HCTO5 should be open-circuit condition.

(3) Fig. 4 to Fig. 7 has described four kinds of SRL and has implemented circuit, wherein T _W1And T _W2Be the connection terminal on the terminal row in the TD plate, T _Wa, T _Wb, T _WcAnd T _WdIt also is connection terminal; S _wBe the electric switch of external (dotting external meaning among the figure) or the A.C. contactor that plays on-off action, relay, travel switch, near the contact or the auxiliary contact of switch and so on; R _LCBe resistance, be welded on the TD plate; LED ₁, LED _aAnd LED _bBe light emitting diode, LED wherein ₁Be welded on the TD plate LED _aAnd LED _bExternal.In addition, S among Fig. 4 to Fig. 7 _w, R _LCBe in series with LED, its position can be exchanged as one sees fit, in order to easy-to-connect.

(4) Fig. 8 is B among Fig. 2 and Fig. 3 ₁To B _nA kind of enforcement circuit, D among the figure _ZBCan select 1W, 4.7V or 5.1V high-quality stabilivolt for use, C _BCan select the ceramic disc capacitor of 0.033 to 0.1 μ F for use, R _B1Can select 5.1K Ω to 10K Ω metal film resistor for use, R _B2Can select 220 Ω or 240 Ω metal film resistors for use, the PT among the figure _BCan select universal optical electric couplers such as 4N25 for use.

(5) R among Fig. 9 _A1Can select 240 Ω metal film resistors for use, D _A1Can select 1N4007 for use, the PT among the figure _AOptional its specified on state current can reach more than the 0.3A with field effect transistor output type photoelectrical coupler, and the off-state leakage current is less than 20 μ A, and off-state is withstand voltage to be not less than 500V.

(6) circuit shown in Figure 10 is suitable with circuit function shown in Figure 9, but the former is lower to the performance requirement of photoelectrical coupler, i.e. PT among Figure 10 _aCan select universal optical electric couplers such as 4N25 for use; R among Figure 10 _A1And D _A1R with Fig. 9 _A1And D _A1Identical.D among Figure 10 _ZACan select 0.5W, 9.1V or 10V stabilivolt for use, R _A2And R _A3Can select 10K Ω and 18K Ω metal film resistor respectively for use, C _ACan select 1000 to 3300PF ceramic disc capacitor devices for use, T _AShould select P raceway groove VMOS pipe for use, its specified on state current can reach more than the 0.5A, and the off-state leakage current is less than 20 μ A, and off-state is withstand voltage to be not less than 500V.

(7) Figure 11 has described the single pass equivalent electrical circuit of the utility model for example, and each components and parts illustrated in front among the figure, and its some principle problems now are described.1. work as S among the figure _wDuring shutoff, LED _a, LED ₁With photoelectrical coupler PT _BInterior LED can be not luminous; At S _wUnder the closed condition, if be labeled as A among the figure _sLead-in wire be high level (approaching+5V), photoelectrical coupler PT _AInterior LED is not luminous, PT _AThe field effect transistor of outgoing side is turn-offed, LED _a, LED ₁And PT _BInterior LED can be not luminous.Work as S _wClosure, A _sBe low level, PT _AInterior LED is luminous, PT _AThe field effect transistor conducting of outgoing side, and the V among the figure _ISOBe enough to overcome each LED and D _A1Dead band voltage the time, LED _a, LED ₁And PT _BThe conducting of interior LED ability is luminous, and its normally electric current can be estimated by following formula:

I _On≈ (V _ISO-0.7V-2 * 2V-V _ZB) ÷ (r _On+ R _LC) 0.7V and 2V are respectively D in the following formula _A1With the approximate estimated sum of LED forward voltage drop, V _ZBBe stabilivolt D _ZBThe voltage stabilizing value, r _OnBe external electric switch S _wAnd the on-state equivalent resistance of line.If get V _ISO=36V, V _ZB=4.7V, R _LC=1.1K Ω works as r so _OnWhen in 0 to 1.5K Ω scope, changing, can obtain I by following formula _OnVariation range be 24.2 to 10.2mA.Though its amplitude of variation is quite big, because D _ZBPressure stabilization function make the voltage at its two ends constant substantially, so P _TBThe electric current of interior LED is constant substantially.If 2. owing to accidental cause, P among the live wire of 220V AC power and the figure ₁And P ₂When the circuit (external part) on the some line left side overlaps, owing to the photoelectricity insulating power supply is floated, and PT _AAnd PT _BThe circuit on the left side does not connect the center line of civil power or greatly, therefore can not damage.

(8) mark " P among Figure 12 _TD-SK _Ch" rectangle frame in expression plug P _TDWith socket SK _ChAnd terminal wiring, the left side of this rectangle frame is identical with counterpart among Fig. 1, and its right is to detect power supply, can share with the photoelectricity insulating power supply or join in addition.

Claims (8)

1. one kind " electric switch group photoelectricity buffer data acquisition and the efficient interface of demonstration ", it is by " being welded with connecting terminal block, current-limiting resistance R _LC, LED circuit board " TD plate, " photoelectricity isolating interface circuit " ISO, photoelectricity insulating power supply and plugs and sockets form; it is characterized in that: each electric switch is connected to terminal row on the TD plate by external wire; m * n SRL branch road can be arranged on the TD plate, m photoelectricity insulating electron switch A among they and the ISO ₁To A _mWith n photoelectricity coupled circuit B ₁To B _nLink to each other, wherein m and n are respectively the natural numbers in 4 to 32 scopes; A among the ISO ₁To A _mAnd B ₁To B _nLink to each other with computer, computer can carry out data acquisition to the on off operating mode of m * n electric switch, and is wired to each electric switch on the TD plate, all has corresponding LED to show its on off operating mode.

2. the utility model according to claim 1 is characterized in that: the circuit mutually insulated in TD plate and the computer, the two transmits information by the light that LED in each photoelectrical coupler among the ISO sends.

3. the utility model according to claim 1 is characterized in that: the TD plate can adopt single-clad board, can be welded with above can external m * n terminal row and m * n SRL branch road of an electric switch, each SRL is respectively by an external electric switch, a R _LCBe connected in series with one to three LED, wherein LED can be external near the electric switch or on the panel of electrical equipment, also can be welded on the TD plate.

4. the utility model according to claim 1 is characterized in that: the on-state contact resistance value of external electric switch and its lead resistance value sum r _OnPermissible value can reach 1.5K Ω, that is to say r _OnWhen in 0 to 1.5K Ω scope, changing, computer still can carry out data acquisition to the on off operating mode of external electric switch, obtain and the corresponding correct data of each external electric switch on off operating mode, its prerequisite is: the equivalent resistance of the electric switch off-state that each is external is greater than 1M Ω.

5. the utility model according to claim 1 is characterized in that: m photoelectricity insulating electron switch A ₁To A _mCircuit theory can be identical, promptly it can be by " field effect transistor output type photoelectrical coupler or the identical circuit of function " with it and resistance R _A1, diode D _A1Constitute, wherein the latter two R _A1And D _A1Be serially connected in the former LED input circuit and field effect transistor output loop respectively.

6. the utility model according to claim 1 is characterized in that: n photoelectricity coupled circuit B ₁To B _nCircuit theory can be identical, promptly it is by general light electric coupler and stabilivolt .D _ZB, capacitor C _B, resistance R _B1And R _B2Constitute LED and R in the photoelectrical coupler _B1After the parallel connection again with R _B2Series connection forms a series-parallel circuit, this series-parallel circuit and C _B, D _ZBTwo element parallel connections.

7. the utility model according to claim 1 is characterized in that: though the contact of external electric switch and line thereof or external LED and line thereof and 220V AC power cord accident touch or overlap so that cause the two to connect, the A among the ISO ₁To A _mAnd B ₁To B _mCan not damage yet.

8. the utility model according to claim 1 is characterized in that: the line that needs on the TD plate to receive ISO can be received plug P earlier _TDOn, P _TDCan insert the socket SK on the ISO _ISOOr detection private jack SK _Ch, two socket models are identical, but their terminal wiring difference, thereby effect difference, that is: P _TDInsert SK _ISOThe time, but the utility model operate as normal; P _TDInsert SK _ChThe time, then under the situation that breaks away from ISO and computer, can debug, detect or keep in repair TD plate and external electric switch and line thereof, particularly, can understand the break-make situation of each corresponding electric switch and line thereof by the bright dark state of observing each LED.

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