CN104868884A - General switching value input signal acquisition circuit - Google Patents
General switching value input signal acquisition circuit Download PDFInfo
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- CN104868884A CN104868884A CN201510295159.5A CN201510295159A CN104868884A CN 104868884 A CN104868884 A CN 104868884A CN 201510295159 A CN201510295159 A CN 201510295159A CN 104868884 A CN104868884 A CN 104868884A
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Abstract
The invention relates to a general switching value input signal acquisition circuit, and belongs to the technical field of signal acquisition. The property (high level or low level) of an input switching value level signal is detected through two triodes of different types respectively, and the two triodes are connected in series to a control loop of a photoelectric coupler. When the input of any type of switching value signal is detected, one triode is always in a cut-off state, and the control loop of the photoelectric coupler is switched off. Only when no switching value signal is input, the two triodes are switched on synchronously, and the control loop of the photoelectric coupler is switched on. Thus, general acquisition of the switching value signals is finished, and differentiation between the existence (high level or low level) and absence (suspending state) of the switching value signals can be finished.
Description
Technical field
The present invention relates to Signal Collection Technology field, be specifically related to a kind of Acquisition Circuit of universal On-off signal signal.
Background technology
Switching value type signal has at industrial control field to be applied comparatively widely, and the signal that puts in place of various plant equipment all will convert the switching value signal of telecommunication to, gathers for computer.On-off model, in transfer process, generally has two kinds of voltage statuss: the high level signal identical with state positive source voltage and the low level signal identical with state power cathode voltage.On-off model is in gatherer process, in order to ensure signals collecting reliability and electrically on fail safe, most needs and processor circuit carry out the isolation electrically, and therefore the collection of on-off model needs to use photoelectrical coupler to complete isolation electrically mostly.
In view of needing the switching value of carrying out gathering to have high level and low level two kinds of signals, switch acquisition method conventional at present has two kinds: one is specifically designed to collection high level signal, and its principle schematic as shown in Figure 1; One is specifically designed to collection low level signal, and its principle schematic as shown in Figure 2.
Gather in the circuit of high level, when there being high level On-off signal, the light-emitting diodes pipe end conducting of photoelectrical coupler, and then make the transistor opens of output, output logic state " low "; When having low level state or do not have level signal to input, the light-emitting diodes pipe end cut-off of photoelectrical coupler, and then the transistor of output is disconnected, output logic state " height ".The logic level exported can be used for computer system to carry out collection judgement.
Gather in low level circuit, when there being low level On-off signal, the light-emitting diodes pipe end conducting of photoelectrical coupler, and then make the transistor opens of output, output logic state " low "; When having high level state or do not have level signal to input, the light-emitting diodes pipe end cut-off of photoelectrical coupler, and then the transistor of output is disconnected, output logic state " height ".The logic level exported can be used for computer system to carry out collection judgement.
When adopting the method in Fig. 1 to gather high level signal switching value, because circuit can only confirm in principle whether high level signal inputs, can not distinguish for low level signal and unsettled signal (not having level to input), cannot gather low level signal; When adopting the method switch amount in Fig. 2 to gather, because circuit can only confirm in principle whether low level signal inputs, can not distinguish for high level signal and unsettled signal (not having level to input), cannot gather high level signal.
In sum, at present when switch amount Acquisition Circuit designs, need the multilevel type of clear and definite On-off signal signal, the circuit types that needs for confirmation adopt.When On-off signal signal demand adjusts, corresponding circuit also needs change.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: the Acquisition Circuit how designing a kind of universal On-off signal signal, can either complete not only to high level signal collection but also to low level signal collection, can also complete switch amount signal has (high level or low level) and the differentiation without (vacant state).
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of Acquisition Circuit of universal On-off signal signal, comprising photoelectrical coupler B1, triode V1, V2, and resistance R1, R2, R3, R4; Wherein,
Photoelectrical coupler B1 is for completing the electrical isolation of On-off signal signal Vin; Resistance R4, as the pull-up resistor of photoelectrical coupler B1, exports for the logic level realizing output end vo ut after electrical isolation; Resistance R3 is the current-limiting resistance of photoelectrical coupler B1 input; Triode V1, V2 are for completing the power supply control in photoelectrical coupler B1 input loop, and triode V1 is different from triode V2 type; Resistance R1 is the current-limiting resistance of triode V1 base loop, and resistance R2 is the current-limiting resistance of triode V2 base loop; The positive source level IVcc of photoelectrical coupler B1 input is connected with the emitter of triode V1, identical with the high level of On-off signal signal Vin; The power cathode level IGND of photoelectrical coupler B1 input is connected with the emitter of triode V2, identical with the low level of On-off signal signal Vin; On-off signal signal Vin has high level, low level and unsettled three kinds of states.
Preferably, On-off signal signal Vin is connected respectively with one end of resistance R1, R2, the base stage of the other end connecting triode V1 of resistance R1, the base stage of the other end connecting triode V2 of resistance R2, one end of the collector electrode contact resistance R3 of triode V1, the other end of resistance R3 connects the positive pole of light-emitting diode in photoelectrical coupler B1, the collector electrode of triode V2 connects the negative pole of light-emitting diode in photoelectrical coupler B1, one end of resistance R4 connects power Vcc, and the other end connects described output end vo ut.
Preferably, triode V1 is positive-negative-positive, and triode V2 is NPN type.
Preferably, the resistance of resistance R4 is determined according to the loading demand of output end vo ut.
Preferably, the resistance of resistance R3 is determined by following computing formula:
R3＝(IVcc-Vce
1-Vce
2-VD)/I
c1
Wherein, Vce
1represent the saturation conduction voltage of triode V1; Vce
2represent the saturation conduction voltage of triode V2; VD represents the forward direction conducting voltage of light-emitting diode in photoelectrical coupler B1; I
c1represent the forward current needed for light-emitting diode in photoelectrical coupler B1;
Wherein, I
c1=I
c2the current transfer ratio of/photoelectrical coupler B1; I
c2represent operating current during output end vo ut conducting:
I
c2≈(Vcc-Vce)/R4
Vce represents photoelectrical coupler B1 output saturation conduction voltage.
Preferably, resistance R1 and R2 determines according to following computing formula:
R1+R2≤β
1(IVcc-V
BE1-V
BE2)/I
c1
R1+R2≤β
2(IVcc-V
BE1-V
BE2)/I
c1
β
1represent the voltage amplification factor of triode V1;
β
2represent the voltage amplification factor of triode V2;
V
bE1represent the emitter junction forward direction conducting voltage of triode V1;
V
bE2represent the emitter junction forward direction conducting voltage of triode V2.
Preferably, β
1=β
2, V
bE1=V
bE2.
(3) beneficial effect
The present invention detects the character (high level or low level) of input switch amount level signal respectively by two no triodes of type, and two triodes are connected in the control loop of photoelectrical coupler, when the on-off model input of any one type being detected, a triode is always had to be in cut-off state, the control loop of photoelectrical coupler is disconnected, only have when not having on-off model to input, the conducting simultaneously of two triode ability, makes the control loop of photoelectrical coupler connect.So complete the generalization collection of switch amount signal, can complete switch amount signal has (high level or low level) and the differentiation without (vacant state).
Accompanying drawing explanation
Fig. 1 is high level On-off signal signals collecting schematic diagram of the prior art;
Fig. 2 is low level On-off signal signals collecting schematic diagram of the prior art;
Fig. 3 is universal On-off signal signals collecting schematic diagram of the present invention.
Embodiment
For making object of the present invention, content and advantage clearly, below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
As shown in Figure 3, the invention provides a kind of Acquisition Circuit of universal On-off signal signal, comprise photoelectrical coupler B1, triode V1, V2, and resistance R1, R2, R3, R4; Wherein,
Photoelectrical coupler B1 is for completing the electrical isolation of On-off signal signal Vin; Resistance R4, as the pull-up resistor of photoelectrical coupler B1, exports for the logic level realizing output end vo ut after electrical isolation; Resistance R3 is the current-limiting resistance of photoelectrical coupler B1 input; Triode V1, V2 are for completing the power supply control in photoelectrical coupler B1 input loop, and triode V1 is different from triode V2 type, and in the present embodiment, triode V1 is positive-negative-positive, and triode V2 is NPN type; Resistance R1 is the current-limiting resistance of triode V1 base loop, and resistance R2 is the current-limiting resistance of triode V2 base loop; The positive source level IVcc of photoelectrical coupler B1 input is connected with the emitter of triode V1, identical with the high level of On-off signal signal Vin; The power cathode level IGND of photoelectrical coupler B1 input is connected with the emitter of triode V2, identical with the low level of On-off signal signal Vin; On-off signal signal Vin has high level, low level and unsettled three kinds of states.
On-off signal signal Vin is connected respectively with one end of resistance R1, R2, the base stage of the other end connecting triode V1 of resistance R1, the base stage of the other end connecting triode V2 of resistance R2, one end of the collector electrode contact resistance R3 of triode V1, the other end of resistance R3 connects the positive pole of light-emitting diode in photoelectrical coupler B1, the collector electrode of triode V2 connects the negative pole of light-emitting diode in photoelectrical coupler B1, and one end of resistance R4 connects power Vcc, and the other end connects described output end vo ut.
The operation principle of circuit of the present invention is: when On-off signal signal Vin is in vacant state, by current-limiting resistance R1 between positive source IVcc and power cathode IGND, R2 and triode V1, the emitter junction of V2 forms loop, two triode emission knots are made all to be in forward bias condition, triode V1, the base loop of V2 produces and controls electric current, by selecting properly current-limiting resistance R1, the parameter value of R2, two triode V1 can be made, V2 is all in the state of saturation conduction, as triode V1, after V2 saturation conduction, the input control end of photoelectrical coupler B1 can be made to form supply access, make the LEDs ON of input, and then cause output conducting, output logic low signal, when On-off signal signal Vin is in high level (namely the level of Vin is identical with IVcc level) state, triode V1 emitter junction both end voltage is identical, emitter junction is in reverse-bias state, triode V1 is in cut-off state, now the input control end of photoelectrical coupler B1 cannot form current supply circuit, the light-emitting diode of input is ended, and then causes output conducting, output logic height signal, when On-off signal signal Vin is in low level (namely the level of Vin is identical with IGND level) state, triode V2 emitter junction both end voltage is identical, emitter junction is in reverse-bias state, triode V2 is in cut-off state, now the input of photoelectrical coupler B1 can not form current supply circuit, the light-emitting diode of input is ended, and then causes output conducting, output logic height signal.In sum, when adopting this circuit switch amount signal to gather, no matter input high level signal or low level signal, equal can at the output output logic height signal of photoelectrical coupler, only when input no signal input (vacant state), the output output logic low signal of photoelectrical coupler, namely this circuit can complete " to have " input switch amount signal and the differentiation of "None", completes switch amount signal generalization collection.
In use, the setting of each running parameter should follow following principle to this circuit:
1) power level of photoelectrical coupler input: positive source level IVcc is identical with the high level of On-off signal signal Vin; Power cathode level IGND is identical with the low level of On-off signal signal Vin;
2) according to the loading demand of logic output terminal, determine the parameter value of pull-up resistor R4, and operating current when calculating logic output terminal conducting accordingly, during output conducting, operating current major part is from the path of logic power through resistance R4, therefore, this operating current calculates by formula (1):
I
c2≈(Vcc-Vce)/R4 (1)
Wherein, Vce-----photoelectric coupler output end saturation conduction voltage,
3) according to I
c2forward current I needed for photoelectrical coupler input diode can be calculated by through type (2) with the current transfer ratio parameter of photoelectrical coupler
c1:
I
c1=I
c2/ current transfer ratio (2)
4) according to I
c1the requirements of parameter, can calculate the resistance of resistance R3 by through type (3):
R3＝(IVcc-Vce
1-Vce
2-VD)/I
c1(3)
Wherein, Vce
1represent triode V1 saturation conduction voltage;
Wherein, Vce
2represent triode V2 saturation conduction voltage;
Wherein, VD represents the forward direction conducting voltage of diode in photoelectrical coupler B1;
5) according to I
c1the requirements of parameter, through type (4) and formula (5) base stage current-limiting resistance R1 and R2 of triode V1, V2 can be determined:
R1+R2≤β
1(IVcc-V
BE1-V
BE2)/I
c1(4)
R1+R2≤β
2(IVcc-V
BE1-V
BE2)/I
c1(5)
Wherein, β
1---the voltage amplification factor of-----triode V1;
β
2---the voltage amplification factor of-----triode V2;
V
bE1the emitter junction forward direction conducting voltage of------triode V1;
V
bE2the emitter junction forward direction conducting voltage of------triode V2;
In engineer applied, triode V1, V2 can choose by complementary pairing, i.e. both voltage amplification factor β
1and β
2identical, forward direction conducting voltage V
bE1and V
bE2also identical, just cast is different, and the parameter value of current-limiting resistance R1 with R2 can be identical.
Can find out, the present invention detects the character (high level or low level) of input switch amount level signal respectively by two no triodes of type, and two triodes are connected in the control loop of photoelectrical coupler, when the on-off model input of any one type being detected, a triode is always had to be in cut-off state, the control loop of photoelectrical coupler is disconnected, only have when not having on-off model to input, the conducting simultaneously of two triode ability, makes the control loop of photoelectrical coupler connect.So complete the generalization collection of switch amount signal, can complete switch amount signal has (high level or low level) and the differentiation without (vacant state).When adopting circuit of the present invention to carry out switch acquisition, without the need to the on-off model electrical level polar of clear needs collection in advance, when extraneous level signal reversing, without the need to again changing circuit design.Adopt the on-off model collection plate of this circuit design can use in more wide scope, greatly improve the versatility of collection plate.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (7)
1. an Acquisition Circuit for universal On-off signal signal, is characterized in that, comprises photoelectrical coupler B1, triode V1, V2, and resistance R1, R2, R3, R4; Wherein,
Photoelectrical coupler B1 is for completing the electrical isolation of On-off signal signal Vin; Resistance R4, as the pull-up resistor of photoelectrical coupler B1, exports for the logic level realizing output end vo ut after electrical isolation; Resistance R3 is the current-limiting resistance of photoelectrical coupler B1 input; Triode V1, V2 are for completing the power supply control in photoelectrical coupler B1 input loop, and triode V1 is different from triode V2 type; Resistance R1 is the current-limiting resistance of triode V1 base loop, and resistance R2 is the current-limiting resistance of triode V2 base loop; The positive source level IVcc of photoelectrical coupler B1 input is connected with the emitter of triode V1, identical with the high level of On-off signal signal Vin; The power cathode level IGND of photoelectrical coupler B1 input is connected with the emitter of triode V2, identical with the low level of On-off signal signal Vin; On-off signal signal Vin has high level, low level and unsettled three kinds of states.
2. the Acquisition Circuit of universal On-off signal signal as claimed in claim 1, it is characterized in that, On-off signal signal Vin and resistance R1, one end of R2 connects respectively, the base stage of the other end connecting triode V1 of resistance R1, the base stage of the other end connecting triode V2 of resistance R2, one end of the collector electrode contact resistance R3 of triode V1, the other end of resistance R3 connects the positive pole of light-emitting diode in photoelectrical coupler B1, the collector electrode of triode V2 connects the negative pole of light-emitting diode in photoelectrical coupler B1, one end of resistance R4 connects power Vcc, the other end connects described output end vo ut.
3. the Acquisition Circuit of universal On-off signal signal as claimed in claim 2, is characterized in that, triode V1 is positive-negative-positive, and triode V2 is NPN type.
4. the Acquisition Circuit of universal On-off signal signal as claimed in claim 3, is characterized in that, the resistance of resistance R4 is determined according to the loading demand of output end vo ut.
5. the Acquisition Circuit of universal On-off signal signal as claimed in claim 3, is characterized in that, the resistance of resistance R3 is determined by following computing formula:
R3＝(IVcc-Vce
1-Vce
2-VD)/I
c1
Wherein, Vce
1represent the saturation conduction voltage of triode V1; Vce
2represent the saturation conduction voltage of triode V2; VD represents the forward direction conducting voltage of light-emitting diode in photoelectrical coupler B1; I
c1represent the forward current needed for light-emitting diode in photoelectrical coupler B1;
Wherein, I
c1=I
c2the current transfer ratio of/photoelectrical coupler B1; I
c2represent operating current during output end vo ut conducting:
I
c2≈(Vcc-Vce)/R4
Vce represents photoelectrical coupler B1 output saturation conduction voltage.
6. the Acquisition Circuit of universal On-off signal signal as claimed in claim 5, it is characterized in that, resistance R1 and R2 determines according to following computing formula:
R1+R2≤β
1(IVcc-V
BE1-V
BE2)/I
c1
R1+R2≤β
2(IVcc-V
BE1-V
BE2)/I
c1
β
1represent the voltage amplification factor of triode V1;
β
2represent the voltage amplification factor of triode V2;
V
bE1represent the emitter junction forward direction conducting voltage of triode V1;
V
bE2represent the emitter junction forward direction conducting voltage of triode V2.
7. the Acquisition Circuit of universal On-off signal signal as claimed in claim 6, is characterized in that, β
1=β
2, V
bE1=V
bE2.
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| CN201510295159.5A CN104868884A (en) | 2015-06-02 | 2015-06-02 | General switching value input signal acquisition circuit |
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|---|---|---|---|
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Cited By (6)
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| CN105116200A (en) * | 2015-09-24 | 2015-12-02 | 深圳市法马新智能设备有限公司 | Detection circuit compatible with switching value and level amount |
| CN105807686A (en) * | 2016-04-05 | 2016-07-27 | 中国船舶重工集团公司第七〇二研究所 | General isolating type on-off input and output module |
| CN105974206A (en) * | 2016-04-25 | 2016-09-28 | 郑州宇通客车股份有限公司 | High-side/low-side effective signal detection circuit |
| CN107966605A (en) * | 2017-11-25 | 2018-04-27 | 贵阳永青仪电科技有限公司 | A kind of lightning protection high level switching value or frequency signal sample circuit |
| CN108845253A (en) * | 2018-10-09 | 2018-11-20 | 华北电力大学（保定） | A kind of switch quantity acquisition circuit |
| CN109120254A (en) * | 2018-10-09 | 2019-01-01 | 华北电力大学（保定） | A kind of switching value input circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105116200A (en) * | 2015-09-24 | 2015-12-02 | 深圳市法马新智能设备有限公司 | Detection circuit compatible with switching value and level amount |
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| CN107966605A (en) * | 2017-11-25 | 2018-04-27 | 贵阳永青仪电科技有限公司 | A kind of lightning protection high level switching value or frequency signal sample circuit |
| CN108845253A (en) * | 2018-10-09 | 2018-11-20 | 华北电力大学（保定） | A kind of switch quantity acquisition circuit |
| CN109120254A (en) * | 2018-10-09 | 2019-01-01 | 华北电力大学（保定） | A kind of switching value input circuit |
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Application publication date: 20150826 |