CN102739235B - Switching value acquisition insulating circuit - Google Patents

Switching value acquisition insulating circuit Download PDF

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Publication number
CN102739235B
CN102739235B CN201210237784.0A CN201210237784A CN102739235B CN 102739235 B CN102739235 B CN 102739235B CN 201210237784 A CN201210237784 A CN 201210237784A CN 102739235 B CN102739235 B CN 102739235B
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voltage
unit
triode
buffer circuit
switch acquisition
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CN102739235A (en
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付如愿
汪文心
罗林
贺盛文
易伟民
王雨
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CRRC Zhuzhou Institute Co Ltd
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CSR Zhuzou Institute Co Ltd
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Abstract

The invention discloses a switching value acquisition insulating circuit.The switching value acquisition insulating circuit comprises a reverse protection unit, a current fixing unit, a voltage measurement unit and a photoelectric insulation unit, wherein a switching value signal is input into the reverse protection unit which is connected with the current fixing unit, a circuit is not damaged under the protection of the reverse protection unit after the switching value signal input and the ground are reversely connected, and the current fixing unit fixes the input current of a circuit after meeting a voltage opening condition. The voltage measurement unit is connected with the current fixing unit and controls the threshold voltage so as to reach a voltage signal condition for opening the circuit. The photoelectric insulation unit is connected with the voltage measurement unit and insulates an external input signal and an internal control signal so as to avoid the interference of external input signals and avoid the damage to an inner circuit caused by external fault. The invention can ensure the constancy of the input current in the acquisition process of a switching value input signals, ensures the photoelectric coupler to work reliably and has the advantages of simple circuit calculation, low power and low heating value.

Description

A kind of switch acquisition buffer circuit
Technical field
The present invention relates to a kind of switch acquisition buffer circuit, especially relate to the switch acquisition buffer circuit that a kind of front end input current is constant.
Background technology
On-off signal Acquisition Circuit is as the basic input circuit of one, its task has been the status information capture process of on-the-spot switching value, by the low voltage digital signal that the transform electric of outside becomes internal circuit to use, field apparatus is coordinated to complete corresponding control, closest to on-the-spot actuator in physical layout, work under bad environment, reliability requirement is high.
What existing the type circuit adopted is electric resistance partial pressure form, input current changes with the change of input voltage, parameter calculation procedure is more complicated, and be unfavorable for related device steady operation, when input voltage is larger, circuitry consumes power is also comparatively large, circuit can be caused to generate heat, affect peripheral circuits and normally work.
A kind of prior art is that Nanrui Jibao Electric Co., Ltd and Nanjing Nanrui Jibao Engineering Technology Co., Ltd applied on 07 24th, 2009, and open on 02 02nd, 2011, publication number is the Chinese invention patent application " switching value input circuit " of CN 101964653A.This circuit is by R4 and R5 electric resistance partial pressure, after the breakdown voltage value that the voltage on R5 reaches zener diode Z1, circuit just meets voltage turn-on condition, along with the increase of input voltage, the electric current of circuit also increases gradually, after meeting the current lead-through condition of optocoupler, input results feeds back a high level to actuator, shows input circuit conducting.
The technical disadvantages of circuit in the past:
(1) input circuit in the past adopts the mode voltage gathered on divider resistance of electric resistance partial pressure to carry out the conducting of completing circuit, the electric current of circuit changes with the change of external switch amount voltage, calculation of complex, precision are lower, power consumption is comparatively large, are unfavorable for photoelectrical coupler long-term stable operation;
(2) circuit counting is complicated, need calculating voltage to satisfy condition, then calculating current satisfies condition, and the condition also needing calculating photoelectrical coupler current transfer ratio to meet, also should consider circuit derate etc.;
(3) circuit power consumption is relatively high.
Summary of the invention
The object of this invention is to provide a kind of switch acquisition buffer circuit, this circuit can guarantee the constant of input current in On-off signal signal acquisition process, and ensure the work that photoelectrical coupler is reliable and stable, circuit counting is simple, power is lower, and circuit caloric value is few.
In order to realize foregoing invention object, the present invention specifically provides a kind of technic relization scheme of switch acquisition buffer circuit, and a kind of switch acquisition buffer circuit, comprising: reverse protection unit, current constant unit, voltage measurement unit and Phototube Coupling unit.On-off model inputs to reverse protection unit, and reverse protection unit is connected with current constant unit, and the input of reverse protection cell protection on-off model connects instead can not damage circuit with ground.Current constant unit is meeting after voltage opens condition, the input current in constant circuit.Voltage measurement unit is connected with current constant unit, and voltage measurement unit controls threshold voltage, to reach the voltage signal condition of circuit debugging.Phototube Coupling unit is connected with voltage measurement unit, and Phototube Coupling unit carries out the isolation of external input signal and internal control signal, avoids the internal circuit that external input signal disturbs and external fault causes to damage.
As the further improvement of a kind of switch acquisition of the present invention buffer circuit technical scheme, current constant unit comprises the second triode and the second resistance, between the gate pole that second resistance is connected to the second triode and emitter, the emitter of the second triode is connected with the negative electrode of counnter attack diode, and the gate pole of the second triode is connected with voltage measurement unit with collector electrode.
As the further improvement of a kind of switch acquisition of the present invention buffer circuit technical scheme, voltage measurement unit comprises the first triode, voltage stabilizing didoe and the first resistance, between the gate pole that first resistance is connected to the first triode and collector electrode, the negative electrode of voltage stabilizing didoe is connected with the collector electrode of the first triode, the anode of voltage stabilizing didoe is connected with Phototube Coupling unit, the emitter of the first triode is connected with the gate pole of the second triode, and the gate pole of the first triode is connected with the collector electrode of the second triode.
Another kind as a kind of switch acquisition buffer circuit of the present invention technical scheme improves, voltage measurement unit comprises the first triode, voltage stabilizing didoe and the first resistance, between the gate pole that first resistance and voltage stabilizing didoe are connected on the first triode and collector electrode, the negative electrode of voltage stabilizing didoe is connected with the first resistance, the anode of voltage stabilizing didoe is connected with Phototube Coupling unit, the anode of voltage stabilizing didoe is also connected with the collector electrode of the first triode simultaneously, the emitter of the first triode is connected with the gate pole of the second triode, the gate pole of the first triode is connected with the collector electrode of the second triode.
As the further improvement of a kind of switch acquisition of the present invention buffer circuit technical scheme, Phototube Coupling unit comprises optical coupling module and the 3rd resistance, optical coupling module comprises transmitting terminal and receiving terminal, the anode of the light-emitting diode of transmitting terminal is connected with the anode of voltage stabilizing didoe, the negative electrode of the light-emitting diode of transmitting terminal is connected with the earth terminal of input, 3rd resistance is connected between the receiving terminal of optical coupling module and ground, and the receiving terminal of optical coupling module is connected with result output.
As the further improvement of the another kind of technical scheme of a kind of switch acquisition of the present invention buffer circuit, Phototube Coupling unit comprises optical coupling module and the 3rd resistance, optical coupling module comprises transmitting terminal and receiving terminal, the anode of the light-emitting diode of transmitting terminal is connected with the gate pole of the second triode, the negative electrode of the light-emitting diode of transmitting terminal is connected with the emitter of the first triode, 3rd resistance is connected between the receiving terminal of optical coupling module and ground, and the receiving terminal of optical coupling module is connected with result output.
As the further improvement of a kind of switch acquisition of the present invention buffer circuit technical scheme, reverse protection unit comprises counnter attack diode, the anode connecting valve amount input signal of counnter attack diode, and the negative electrode of counnter attack diode connects current constant unit.
Another kind as a kind of switch acquisition buffer circuit of the present invention technical scheme improves, and reverse protection unit comprises counnter attack diode, and the negative electrode of counnter attack diode connects ground, and the anode of counnter attack diode connects Phototube Coupling unit.
As the further improvement of a kind of switch acquisition of the present invention buffer circuit technical scheme, the voltage V between the gate pole of the first triode and collector electrode bCbetween 0V to the input voltage and threshold voltage difference of switch acquisition buffer circuit.
As the further improvement of a kind of switch acquisition of the present invention buffer circuit technical scheme, the threshold voltage of switch acquisition buffer circuit is the conduction voltage drop of counnter attack diode, the conducting voltage sum of voltage, the puncture voltage of voltage stabilizing didoe and the light-emitting diode of optical coupling module transmitting terminal between the second transistor emitter and collector electrode.
By implementing the technical scheme of a kind of switch acquisition buffer circuit of the invention described above, there is following technique effect:
(1) circuit structure of the present invention is simple, adopts diode collector electrode and the constant feature of emitter both end voltage to guarantee that circuital current is constant, can be easy to fast calculate input current size;
(2) input current of circuit of the present invention is all by optocoupler, does not have other circuit to separate electric current, ensure that optocoupler works at steady state;
(3) circuit overall size of current of the present invention reduces, and decreases power consumption.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit theory diagrams of a kind of switching value input circuit of prior art;
Fig. 2 is the structure composition frame chart of a kind of embodiment of switch acquisition buffer circuit of the present invention;
Fig. 3 is the circuit theory diagrams of switch acquisition buffer circuit embodiment 1 of the present invention;
Fig. 4 is the circuit theory diagrams of switch acquisition buffer circuit embodiment 2 of the present invention;
Fig. 5 is the circuit theory diagrams of switch acquisition buffer circuit embodiment 3 of the present invention;
Fig. 6 is the circuit theory diagrams of switch acquisition buffer circuit embodiment 4 of the present invention;
In figure: 1-reverse protection unit, 2-current constant unit, 3-voltage measurement unit, 4-Phototube Coupling unit; Q1-first triode, Q2-second triode, V1-optical coupling module, V2-voltage stabilizing didoe; V3-counnter attack diode, R1-first resistance, R2-second resistance, R3-the 3rd resistance.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in accompanying drawing 2 to accompanying drawing 6, give the present invention a kind of specific embodiment of switch acquisition buffer circuit, below in conjunction with the drawings and specific embodiments, the invention will be further described.
The embodiment of a kind of switch acquisition buffer circuit as shown in Figure 2; comprise: reverse protection unit 1, current constant unit 2, voltage measurement unit 3 and Phototube Coupling unit 4; on-off model inputs to reverse protection unit 1; reverse protection unit 1 is connected with current constant unit 2; the input of reverse protection unit 1 protection switch amount signal connects instead can not damage circuit with ground; current constant unit 2 is meeting after voltage opens condition, the input current in constant circuit.Voltage measurement unit 3 is connected with current constant unit 2, and voltage measurement unit 3 controls threshold voltage, to reach the voltage signal condition of circuit debugging.Phototube Coupling unit 4 is connected with voltage measurement unit 3, and Phototube Coupling unit 4 carries out the isolation of external input signal and internal control signal, avoids the internal circuit that external input signal disturbs and external fault causes to damage.
As shown in the embodiment 1 of accompanying drawing 3, current constant unit 2 comprises the second triode Q2 and the second resistance R2 further, between the gate pole that second resistance R2 is connected to the second triode Q2 and emitter, the emitter of the second triode Q2 is connected with the negative electrode of counnter attack diode V3, and the gate pole of the second triode Q2 is connected with voltage measurement unit 3 with collector electrode.Voltage measurement unit 3 comprises the first triode Q1, voltage stabilizing didoe V2 and the first resistance R1 further, between the gate pole that first resistance R1 is connected to the first triode Q1 and collector electrode, the negative electrode of voltage stabilizing didoe V2 is connected with the collector electrode of the first triode Q1, the anode of voltage stabilizing didoe V2 is connected with Phototube Coupling unit 4, the emitter of the first triode Q1 is connected with the gate pole of the second triode Q2, and the gate pole of the first triode Q1 is connected with the collector electrode of the second triode Q2.Phototube Coupling unit 4 comprises optical coupling module V1 and the 3rd resistance R3 further, optical coupling module V1 comprises transmitting terminal and receiving terminal, the anode of the light-emitting diode of transmitting terminal is connected with the anode of voltage stabilizing didoe V2, the negative electrode of the light-emitting diode of transmitting terminal is connected with the earth terminal of input, between the receiving terminal that 3rd resistance R3 is connected to optical coupling module V1 and ground, the receiving terminal of optical coupling module V1 is connected with result output.Reverse protection unit 1 comprises counnter attack diode V3 further, the anode connecting valve amount input signal of counnter attack diode V3, and the negative electrode of counnter attack diode V3 connects current constant unit 2.
As shown in the embodiment 2 of accompanying drawing 4, in the position of the basic up conversion voltage stabilizing didoe V2 of embodiment 1, voltage measurement unit 3 comprises the first triode Q1 further, voltage stabilizing didoe V2 and the first resistance R1, between the gate pole that first resistance R1 and voltage stabilizing didoe V2 is connected on the first triode Q1 and collector electrode, the negative electrode of voltage stabilizing didoe V2 is connected with the first resistance R1, the anode of voltage stabilizing didoe V2 is connected with Phototube Coupling unit 4, the anode of voltage stabilizing didoe V2 is also connected with the collector electrode of the first triode Q1 simultaneously, the emitter of the first triode Q1 is connected with the gate pole of the second triode Q2, the gate pole of the first triode Q1 is connected with the collector electrode of the second triode Q2.
As shown in the embodiment 3 of accompanying drawing 5, in the position of the basic up conversion Phototube Coupling unit 4 of embodiment 2, Phototube Coupling unit 4 comprises optical coupling module V1 and the 3rd resistance R3 further, optical coupling module V1 comprises transmitting terminal and receiving terminal, the anode of the light-emitting diode of transmitting terminal is connected with the gate pole of the second triode Q2, the negative electrode of the light-emitting diode of transmitting terminal is connected with the emitter of the first triode Q1, between the receiving terminal that 3rd resistance R3 is connected to optical coupling module V1 and ground, the receiving terminal of optical coupling module V1 is connected with result output.
As shown in the embodiment 4 of accompanying drawing 6, in the position of the basic up conversion counnter attack diode V3 of embodiment 1, reverse protection unit 1 comprises counnter attack diode V3 further, and the negative electrode of counnter attack diode V3 connects ground, and the anode of counnter attack diode V3 connects Phototube Coupling unit 4.
Voltage V between the gate pole of the first triode Q1 and collector electrode bCfor the input voltage of switch acquisition buffer circuit is between threshold voltage.The threshold voltage of switch acquisition buffer circuit is the conducting voltage sum of the conduction voltage drop of counnter attack diode V3, voltage, the puncture voltage of voltage stabilizing didoe V2 and the light-emitting diode of optical coupling module V1 transmitting terminal between the second triode Q2 emitter and collector electrode.
For embodiment 1, below circuit theory is analyzed as follows: the voltage threshold value condition that the conducting of switch acquisition buffer circuit need meet: the conduction voltage drop of counnter attack diode V3 is the voltage V between 1.0V, AB 2 aB=2*V bethe puncture voltage of=2*0.6=1.2V, voltage stabilizing didoe V2 is 5.6V, the conducting voltage V of the light-emitting diode of optical coupling module V1 transmitting terminal ffor 1.2V, the threshold voltage V of so conducting sat=1.0+1.2+5.6+1.2=9V.After circuit meets voltage conditions, along with the increase of input voltage, electric current keeps constant substantially.Because the first resistance R1 resistance is comparatively large, the electric current that the first resistance R1 produces can be ignored, I=V be/ R2=0.6V/120 Ω=5mA.When voltage and current condition all meets, circuit turn-on, Output rusults is a high level, and wherein in switch acquisition buffer circuit input circuit part, the voltage of other changes is all added in base stage and the collector electrode two ends of the first triode Q1, namely in accompanying drawing 3 B point and C point between voltage V bC, its voltage range is about 0V ~ between input voltage and the difference of threshold voltage.
The present invention utilizes PNP triode V bethe feature of voltage constant, the second resistance R2 in parallel, produces the fixed current of this circuit, I=V be/ R2=0.6/120=5mA, wherein this electric current can adjust by actual conditions, adjusts simple.Utilize PNP triode V bcthe feature of larger voltage can be born, by in circuit except the pressure drop of the light-emitting diode of counnter attack diode V3, the second triode Q2, voltage stabilizing didoe V2 and optical coupling module V1 transmitting terminal, other voltages are all carried in base stage and the collector electrode two ends of the first triode Q1, guarantee the stable of circuit.Utilize the feature of voltage stabilizing didoe V2 burning voltage, substantially determine the threshold value of switch acquisition buffer circuit input voltage, wherein determine voltage threshold value by adjustment voltage stabilizing value, adjust simple.Circuit has anti-reverse function, utilizes the feature of counnter attack diode V3, guarantee input voltage connect anti-after be unlikely to conducting and cause device failure.Circuit has antijamming capability, utilizes the feature of optical coupling module V1 in Phototube Coupling unit, converts the signal of telecommunication to by light signal, realizes the electrical isolation of external electrical circuit and internal signal circuit.Meanwhile, there is no high power device in circuit, encapsulate little, occupy little space, low in energy consumption, be beneficial to intensive multichannel use.This circuit scope of application is comparatively wide, can be used in each system such as industrial circle 24V, 36V, 48V etc. and rail locomotive field 55V, 110V.
The present invention has following technique effect:
(1) PNP triode V is adopted bethe feature of voltage constant, stabilizing circuit input current;
(2) PNP triode V is adopted bcthe feature of larger voltage can be born, by exceeding the voltage-drop loading of gate threshold value at its two ends, applied widely, can be applicable in multi-voltage grade design;
(3) photoelectrical coupler is adopted to carry out signal isolation;
(4) rectifier diode is adopted to carry out reverse protection;
(5) voltage stabilizing didoe is adopted to carry out the setting of input voltage threshold value;
(6) if the mode adopting input current constant, during input voltage change, input current is constant, the work that so optocoupler just can be stable, and opposing circuit calculates simple;
(7) the present invention has novel structure, circuit is simple, practical reliable, with low cost, can meet the features such as the demand of industrial field control within the specific limits, belong to a kind of and integrate economical and practical with reliable and stable On-off signal Acquisition Circuit.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention.Although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention.Any those of ordinary skill in the art, do not departing under technical solution of the present invention ambit, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solution of the present invention, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent replacement, equivalence change and modification, all still belongs in the scope of technical solution of the present invention protection.

Claims (11)

1. a switch acquisition buffer circuit, it is characterized in that, comprise: reverse protection unit (1), current constant unit (2), voltage measurement unit (3) and Phototube Coupling unit (4), on-off model inputs to reverse protection unit (1), described reverse protection unit (1) is connected with current constant unit (2), the input of reverse protection unit (1) protection switch amount signal connects instead can not damage circuit with ground, the input voltage of current constant unit (2) is after meeting the threshold voltage condition that switch acquisition buffer circuit opens, along with the increase of input voltage, input current in switch acquisition buffer circuit is constant, described voltage measurement unit (3) is connected with current constant unit (2), and voltage measurement unit (3) controls threshold voltage, to reach the voltage conditions that switch acquisition buffer circuit is opened, described Phototube Coupling unit (4) is connected with voltage measurement unit (3), and Phototube Coupling unit (4) carries out the isolation of external input signal and internal control signal, avoids the internal circuit that external input signal disturbs and external fault causes to damage, described current constant unit (2) comprises the second triode (Q2) and the second resistance (R2), between the gate pole that second resistance (R2) is connected to the second triode (Q2) and emitter, the emitter of the second triode (Q2) is connected with the negative electrode of counnter attack diode (V3), and the gate pole of the second triode (Q2) is connected with voltage measurement unit (3) with collector electrode, when described input voltage and input current meet switch acquisition buffer circuit open condition time, switch acquisition buffer circuit conducting, and by described Phototube Coupling unit (4) externally outputs level signals, the threshold voltage that described switch acquisition buffer circuit is opened is determined by described reverse protection unit (1), current constant unit (2), voltage measurement unit (3) and Phototube Coupling unit (4).
2. a kind of switch acquisition buffer circuit according to claim 1, it is characterized in that: described voltage measurement unit (3) comprises the first triode (Q1), voltage stabilizing didoe (V2) and the first resistance (R1), between the gate pole that first resistance (R1) is connected to the first triode (Q1) and collector electrode, the negative electrode of voltage stabilizing didoe (V2) is connected with the collector electrode of the first triode (Q1), the anode of voltage stabilizing didoe (V2) is connected with Phototube Coupling unit (4), the emitter of the first triode (Q1) is connected with the gate pole of the second triode (Q2), the gate pole of the first triode (Q1) is connected with the collector electrode of the second triode (Q2).
3. a kind of switch acquisition buffer circuit according to claim 1, it is characterized in that: described voltage measurement unit (3) comprises the first triode (Q1), voltage stabilizing didoe (V2) and the first resistance (R1), between the gate pole that first resistance (R1) and voltage stabilizing didoe (V2) are connected on the first triode (Q1) and collector electrode, the negative electrode of voltage stabilizing didoe (V2) is connected with the first resistance (R1), the anode of voltage stabilizing didoe (V2) is connected with Phototube Coupling unit (4), the anode of voltage stabilizing didoe (V2) is also connected with the collector electrode of the first triode (Q1) simultaneously, the emitter of the first triode (Q1) is connected with the gate pole of the second triode (Q2), the gate pole of the first triode (Q1) is connected with the collector electrode of the second triode (Q2).
4. a kind of switch acquisition buffer circuit according to Claims 2 or 3, it is characterized in that: described Phototube Coupling unit (4) comprises optical coupling module (V1) and the 3rd resistance (R3), optical coupling module (V1) comprises transmitting terminal and receiving terminal, the anode of the light-emitting diode of transmitting terminal is connected with the anode of voltage stabilizing didoe (V2), the negative electrode of the light-emitting diode of transmitting terminal is connected with the earth terminal of input, between the receiving terminal that 3rd resistance (R3) is connected to optical coupling module (V1) and ground, the receiving terminal of optical coupling module (V1) is connected with result output.
5. a kind of switch acquisition buffer circuit according to Claims 2 or 3, it is characterized in that: described Phototube Coupling unit (4) comprises optical coupling module (V1) and the 3rd resistance (R3), optical coupling module (V1) comprises transmitting terminal and receiving terminal, the anode of the light-emitting diode of transmitting terminal is connected with the gate pole of the second triode (Q2), the negative electrode of the light-emitting diode of transmitting terminal is connected with the emitter of the first triode (Q1), between the receiving terminal that 3rd resistance (R3) is connected to optical coupling module (V1) and ground, the receiving terminal of optical coupling module (V1) is connected with result output.
6. a kind of switch acquisition buffer circuit according to claim 4; it is characterized in that: described reverse protection unit (1) comprises counnter attack diode (V3); the anode connecting valve amount input signal of counnter attack diode (V3), the negative electrode of counnter attack diode (V3) connects current constant unit (2).
7. a kind of switch acquisition buffer circuit according to claim 4; it is characterized in that: described reverse protection unit (1) comprises counnter attack diode (V3); the negative electrode of counnter attack diode (V3) connects ground, and the anode of counnter attack diode (V3) connects Phototube Coupling unit (4).
8. a kind of switch acquisition buffer circuit according to claim 5; it is characterized in that: described reverse protection unit (1) comprises counnter attack diode (V3); the anode connecting valve amount input signal of counnter attack diode (V3), the negative electrode of counnter attack diode (V3) connects current constant unit (2).
9. a kind of switch acquisition buffer circuit according to claim 5; it is characterized in that: described reverse protection unit (1) comprises counnter attack diode (V3); the negative electrode of counnter attack diode (V3) connects ground, and the anode of counnter attack diode (V3) connects Phototube Coupling unit (4).
10. according to claim 2,3, a kind of switch acquisition buffer circuit in 6-9 described in arbitrary claim, it is characterized in that: the voltage V between the gate pole of described first triode (Q1) and collector electrode bCbetween 0V to the input voltage and the difference of threshold voltage of switch acquisition buffer circuit.
11. a kind of switch acquisition buffer circuits according to claim 10, is characterized in that: the threshold voltage of described switch acquisition buffer circuit is the conducting voltage sum of the conduction voltage drop of counnter attack diode (V3), the second triode (Q2) voltage between emitter and collector electrode, the puncture voltage of voltage stabilizing didoe (V2) and the light-emitting diode of optical coupling module (V1) transmitting terminal.
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CN105187049B (en) * 2015-07-21 2018-07-31 北京佳讯飞鸿电气股份有限公司 The dynamic acquisition circuit of fault-safety principle and the device of fault-safety principle
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