CN110456132B - Current acquisition device and distributed control system - Google Patents
Current acquisition device and distributed control system Download PDFInfo
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- CN110456132B CN110456132B CN201910769434.0A CN201910769434A CN110456132B CN 110456132 B CN110456132 B CN 110456132B CN 201910769434 A CN201910769434 A CN 201910769434A CN 110456132 B CN110456132 B CN 110456132B
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- 238000005070 sampling Methods 0.000 claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims description 42
- 230000001052 transient effect Effects 0.000 claims description 27
- 230000001629 suppression Effects 0.000 claims description 22
- 239000011324 bead Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 description 25
- 238000010586 diagram Methods 0.000 description 6
- 238000011084 recovery Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Abstract
The application discloses current collection system includes: the current acquisition device comprises a current acquisition device body, wherein a power supply terminal and a signal access terminal are arranged on the current acquisition device body, the power supply terminal is connected with the negative electrode of D1, the positive electrode of D1 is connected with the first end of a thermosensitive element, the second end of the thermosensitive element is respectively connected with the negative electrode of D2 and the first end of a first fuse, the positive electrode of D2 is grounded, and the second end of the first fuse is connected with a protection circuit in the current acquisition device body; the signal access terminal is connected with the first end of the second fuse, the second end of the second fuse is connected with the positive electrode of the TVS and the drain electrode of the NMOS tube respectively, the negative electrode of the TVS is grounded, the source electrode of the NMOS tube is connected with the sampling circuit in the current collecting device body, and the grid electrode of the NMOS tube is used for receiving target voltage. The device can avoid damage to the current acquisition device when the strong current is mistakenly connected to the wiring terminal of the current acquisition device.
Description
Technical Field
The invention relates to the technical field of industrial collection, in particular to a current collection device and a distributed control system.
Background
Along with the rapid development of the industrial collection field, the types of current collection devices on the market are more and more, however, in the prior art, the current collection devices cannot support strong current attack, namely, if a worker connects strong current to a wiring terminal of the current collection device in the operation field by mistake, the current collection device can be burnt, so that not only can huge economic loss be brought to people, but also the safety and the reliability of the current collection device in the use process can be reduced. At present, no effective solution is available for the technical problem.
Therefore, how to further improve the safety and reliability of the current collecting device in the using process is a technical problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
In view of the above, the present invention provides a current collecting device and a distributed control system, so as to further improve the safety and reliability of the current collecting device during the use process. The specific scheme is as follows:
a current collection device, comprising: the electric current collection device body, be provided with power supply terminal and signal access terminal on the electric current collection device body, still include: the circuit comprises a first diode, a second diode, a thermosensitive element, a first fuse, a second fuse, a transient suppression diode and an NMOS tube;
the power supply terminal is connected with the cathode of a first diode, the anode of the first diode is connected with the first end of the thermosensitive element, the second end of the thermosensitive element is respectively connected with the cathode of a second diode and the first end of the first fuse, the anode of the second diode is grounded, and the second end of the first fuse is connected with a protection circuit in the current collection device body;
the signal access terminal is connected with a first end of the second fuse, a second end of the second fuse is respectively connected with an anode of the transient suppression diode and a drain electrode of the NMOS tube, a cathode of the transient suppression diode is grounded, a source electrode of the NMOS tube is connected with a sampling circuit in the current acquisition device body, and a grid electrode of the NMOS tube is used for receiving a target voltage triggering the NMOS tube to work.
Preferably, the first fuse is a square fuse.
Preferably, the second fuse is a self-recovery fuse.
Preferably, the method further comprises the following steps: a first capacitor and a second capacitor;
the first end of the first capacitor is connected with the power supply terminal, and the second end of the first capacitor is grounded; and the first end of the second capacitor is connected with the signal access terminal, and the second end of the second capacitor is grounded.
Preferably, the method further comprises the following steps: a third capacitor;
the first end of the third capacitor is connected with the connecting line of the power supply terminal, and the second end of the third capacitor is connected with the connecting line of the signal access terminal.
Preferably, the method further comprises the following steps: a fourth capacitor;
the first end of the fourth capacitor is connected with the anode of the transient suppression diode, and the second end of the fourth capacitor is grounded.
Preferably, the method further comprises the following steps: magnetic beads;
the first end of the magnetic bead is connected with the power supply terminal, and the second end of the magnetic bead is connected with the negative electrode of the first diode.
Correspondingly, the invention also discloses a distributed control system which comprises the current acquisition device disclosed in the foregoing.
Therefore, in the invention, when a worker connects a strong current into the power supply terminal of the current collection device, firstly, the first diode can block the strong current, and if the strong current enters the rear stage of the first diode through the first diode, the heat-sensitive element can consume the energy generated by the strong current, thereby ensuring that the current collection device cannot be burnt. If an external power supply exists in the current acquisition device, the first fuse is also fused by the current of the external power supply, so that the safety of the circuit where the power supply terminal is located is ensured; when a worker accesses a strong current into a signal access terminal of the current acquisition device, firstly, the second fuse and the transient suppression diode form a primary protection circuit to block the strong current, and the NMOS tube is used for clamping residual voltage on the transient suppression diode so as to prevent the residual voltage from burning out a sampling circuit in the current acquisition device. Obviously, compare in prior art, can avoid through the current acquisition device that this embodiment provided when misconnecting the heavy current at current acquisition device's binding post, damage to current acquisition device caused, just so further guaranteed security and the reliability of current acquisition device in the use from this. Correspondingly, the distributed control system disclosed by the invention also has the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a structural diagram of a current collecting device according to an embodiment of the present invention;
fig. 2 is a structural diagram of another current collecting device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a current collecting device according to an embodiment of the present invention, including: the electric current collection device body is provided with power supply terminal A and signal access terminal B on the electric current collection device body, its characterized in that still includes: the circuit comprises a first diode D1, a second diode D2, a thermosensitive element, a first fuse, a second fuse, a transient suppression diode and an NMOS tube;
the power supply terminal A is connected with the cathode of a first diode D1, the anode of a first diode D1 is connected with the first end of a thermosensitive element, the second end of the thermosensitive element is respectively connected with the cathode of a second diode D2 and the first end of a first fuse, the anode of the second diode D2 is grounded, and the second end of the first fuse is connected with a protection circuit in the current collecting device body;
the signal access terminal B is connected with the first end of a second fuse, the second end of the second fuse is connected with the anode of the transient suppression diode and the drain electrode of the NMOS tube respectively, the cathode of the transient suppression diode is grounded, the source electrode of the NMOS tube is connected with a sampling circuit in the current acquisition device body, and the grid electrode of the NMOS tube is used for receiving a target voltage for triggering the NMOS tube to work.
In the embodiment, in order to further improve the safety and reliability of the current collection device in the using process, the current collection device supporting strong current attack is provided. Specifically, when the staff connects the heavy current into the power supply terminal a of the current collection device, firstly, the first diode D1 blocks the heavy current from entering the inside of the current collection device, and if the heavy current passes through the first diode D1 in a certain time period, then the thermosensitive element will also consume the energy generated by the heavy current, thereby ensuring that the current collection device will not be burned. If an external power supply exists in the current acquisition device, the first fuse is fused by the current of the external power supply, so that the safety of the circuit where the power supply terminal A is located is ensured; when an operator accesses a strong current to the signal access terminal B of the current collection device, first, the second fuse and the Transient Voltage Suppressor (TVS) form a primary protection circuit to block the strong current, and the NMOS transistor is also used to clamp the residual Voltage on the Transient Voltage Suppressor to prevent the residual Voltage from burning the sampling circuit in the current collection device. Therefore, the current collection device provided by the embodiment can avoid damage to the current collection device when the strong current is mistakenly connected to the wiring terminal of the current collection device.
Note that, in the present embodiment, the left side of the dotted line in fig. 1 represents the circuits on the power supply terminal a and the signal access terminal B, and the right side of the dotted line represents the circuits inside the current collection device. That is, the protection circuit, the sampling circuit, and the sampling resistor shown in fig. 1 are all located inside the current collection device.
Here, a description is given by way of a specific example. The following first describes parameters of the selected electronic components in the current collection device. First, the thermistor may be provided as a thermistor, and the selected thermistor (PTC) may also have the following characteristics: 1) when the resistance of the thermistor is in the range of-20 ℃ to 60 ℃, the maximum resistance and the minimum resistance of the thermistor are respectively 55 omega and 29 omega; 2) the non-action current of the thermistor is 30mA @25 ℃; 3) the action current of the thermistor is 40mA @25 ℃; 4) the action time of the thermistor is less than 300 ms; 5) the maximum working voltage of the thermistor is 265V; the back voltage resistance of the first diode D1 is 660V, the transient power of the transient diode is 600W, the maximum clamping voltage is 36V, and the maximum allowable voltage Vgs between the gate and the source of the NMOS transistor is ± 20V, NMOS, and the maximum allowable voltage Vds between the drain and the source of the NMOS transistor is 60V.
Then, when the 220V ac power is connected to the power supply terminal a of the current collecting device, the first diode D1 blocks the positive half-wave of the 220V ac power, and the negative half-wave of the 220V ac power passes through the first diode D1 and then is clamped by the second diode D2, at this time, the energy generated by the 220V ac power is consumed by the thermistor, and even if the external power source is connected to the current collecting device, the current of the external power source will fuse the first fuse, thereby cutting off the connection channel of the power supply terminal a, obviously, in this case, the 220V ac power will not burn the current collecting device.
When 220V ac is connected to the signal connection terminal B of the current collection device, firstly, the 220V ac is blocked by the primary protection circuit composed of the second fuse and the transient suppression diode, because the transient power of the selected transient suppression diode is 600W, the current required for cutting off the second fuse is about 3mA, and the maximum clamping voltage of the transient suppression diode is 36V. In this case, the NMOS transistor can suppress the residual voltage on the diode instantaneously so as not to burn out the 36V residual voltage in the sampling circuit at the subsequent stage of the current sampling device.
Specifically, when the input current of the sampling circuit of the current acquisition device is less than 40mA, the voltage of the source electrode of the NMOS tube is less than 5V, the voltage between the grid electrode and the source electrode of the NMOS tube is more than 7V, and at the moment, the NMOS tube works in the variable resistance area; because the voltage between the grid electrode and the source electrode of the NMOS tube is large, when the drain current Id of the NMOS tube changes within 4-20 mA, the voltage between the drain electrode and the source electrode of the NMOS tube is almost zero; and when the input current of the current acquisition device sampling circuit is greater than 40mA, the voltage between the grid electrode and the source electrode of the NMOS tube is reduced, under the condition, the NMOS tube works in a constant current region, at the moment, the current of a channel where a signal access terminal B in the current acquisition device is located can be kept unchanged at 40mA, and therefore the acquisition circuit in the current acquisition device cannot be burnt. Obviously, when the residual voltage at the rear end of the instantaneous suppressor diode is 36V, the sampling current of the sampling circuit in the current acquisition device can be kept unchanged at 40mA, and at the moment, the current acquisition device cannot be burnt. Therefore, the current acquisition device provided by the embodiment can avoid damage to the current acquisition device when a worker mistakenly connects a strong current to the wiring port of the current acquisition device on an operation site, so that the safety and the reliability of the current acquisition device in the use process are further ensured.
It can be seen that, in this embodiment, when a worker connects a strong current to the power supply terminal of the current collecting device, the first diode will block the strong current, and if the strong current enters the rear stage of the first diode through the first diode, the heat sensitive element will consume the energy generated by the strong current, thereby ensuring that the current collecting device will not be burned out. If an external power supply exists in the current acquisition device, the first fuse is also fused by the current of the external power supply, so that the safety of the circuit where the power supply terminal is located is ensured; when a worker accesses a strong current into a signal access terminal of the current acquisition device, firstly, the second fuse and the transient suppression diode form a primary protection circuit to block the strong current, and the NMOS tube is used for clamping residual voltage on the transient suppression diode so as to prevent the residual voltage from burning out a sampling circuit in the current acquisition device. Obviously, compare in prior art, can avoid through the current acquisition device that this embodiment provided when misconnecting the heavy current at current acquisition device's binding post, damage to current acquisition device caused, just so further guaranteed security and the reliability of current acquisition device in the use from this.
Based on the above embodiments, the present embodiment further describes and optimizes the technical solution, and as a preferred implementation, the first fuse is specifically a square fuse.
In this embodiment, the first fuse may be a square fuse, and the square fuse has a higher breaking capacity, so that the square fuse can be fused more quickly when the thermosensitive element generates energy consumption, and thus the probability of the current collecting device being burned out can be further reduced.
Based on the above embodiments, the present embodiment further describes and optimizes the technical solution, and as a preferred implementation, the second fuse is specifically a self-healing fuse.
Specifically, in practical application, the second fuse can be set as a self-recovery fuse, and the self-recovery fuse has the advantages of being recoverable and reusable compared with a common fuse, so that when the second fuse is set as the self-recovery fuse, the manufacturing cost of the current collecting device can be relatively reduced.
Based on the above embodiments, the present embodiment further describes and optimizes the technical solution, please refer to fig. 2, and fig. 2 is a structural diagram of another current collecting device provided by the embodiment of the present invention. As a preferred embodiment, the current collection device further includes: a first capacitor C1 and a second capacitor C2;
a first end of the first capacitor C1 is connected with the power supply terminal A, and a second end of the first capacitor C1 is grounded; a first terminal of the second capacitor C2 is connected to the signal access terminal B, and a second terminal of the second capacitor C2 is connected to ground.
In this embodiment, in order to further improve the safety of the current collecting device in the data collecting process, a first capacitor C1 and a second capacitor C2 are further respectively disposed at the inlets of the power supply terminal and the signal access terminal, so as to eliminate high-frequency damped oscillation waves, i.e., high-frequency interference, generated by the power supply terminal a and the signal access terminal B on the respective line channels. Specifically, in practical applications, the capacities of the first capacitor C1 and the second capacitor may be set to be 1 nf.
Therefore, by the technical scheme provided by the embodiment, the current collecting device can be relatively reduced in the current collecting process,
based on the above embodiments, the present embodiment further describes and optimizes the technical solution, please refer to fig. 2, and fig. 2 is a structural diagram of another current collecting device provided by the embodiment of the present invention. As a preferred embodiment, the current collection device further includes: a third capacitance C3;
wherein, the first end of the third capacitor C3 is connected with the connection line of the power supply terminal A, and the second end of the third capacitor C3 is connected with the connection line of the signal access terminal B.
It is understood that, in practical applications, no matter whether a strong current is erroneously connected to the power supply terminal a or the signal access terminal B of the current collection device, a certain current must exist between the connection lines of the power supply terminal a and the signal access terminal B, so in the present embodiment, in order to ensure the normal operation of the current collection device, a third capacitor C3 is further connected between the connection lines of the power supply terminal a and the signal access terminal B to prevent static electricity from being generated between the power supply terminal a and the signal access terminal B. Specifically, in practical applications, the third capacitor C3 may be set to a capacitance of 10 nf.
Therefore, the technical scheme provided by the embodiment further ensures the overall reliability of the current acquisition device in the current acquisition process.
Based on the above embodiments, the present embodiment further describes and optimizes the technical solution, please refer to fig. 2, and fig. 2 is a structural diagram of another current collecting device provided by the embodiment of the present invention. As a preferred embodiment, the current collection device further includes: a fourth capacitance C4;
a first terminal of the fourth capacitor C4 is connected to the anode of the transient suppression diode, and a second terminal of the fourth capacitor C4 is grounded.
It is conceivable that if a strong current is erroneously connected to the signal connection terminal B of the current collection device, the transient suppression diode generates a large current change, which generates a large impedance, and therefore, in the present embodiment, a fourth capacitor C4 is further connected between the positive electrode and the negative electrode of the transient suppression diode, so as to reduce the impedance generated by the transient suppression diode during operation, and thus reduce the probability of a safety accident. Furthermore, a fifth capacitor may be connected between the anode and the cathode of the second diode to filter the current in the connection line on which the supply terminal a is located.
Therefore, the technical scheme provided by the embodiment further ensures the safety and reliability of the current collecting device in the operation process.
Based on the above embodiments, the present embodiment further describes and optimizes the technical solution, please refer to fig. 2, and fig. 2 is a structural diagram of another current collecting device provided by the embodiment of the present invention. As a preferred embodiment, the current collection device further includes: magnetic beads;
the first end of the magnetic bead is connected with the power supply terminal A, and the second end of the magnetic bead is connected with the negative electrode of the first diode D1.
It can be understood that, in practical applications, static electricity is inevitably generated in the current collecting device during the current collecting process, and this phenomenon can seriously affect the normal operation of the current collecting device, so in this embodiment, a magnetic bead is further disposed between the power supply terminal a and the first diode D1, so as to eliminate the static electricity in the current collecting device by using the magnetic bead.
Therefore, through the technical scheme provided by the embodiment, the electrostatic interference suffered by the current acquisition device in the current acquisition process can be relatively avoided.
Correspondingly, the invention also discloses a distributed control system which comprises the current acquisition device disclosed in the foregoing.
In practical applications, the current collection device is located in an IO slave station slot of a Distributed Control System (DCS), so that the current collection device can collect the current of the electrical equipment in an operation field, and in the process of collecting the current of the electrical equipment, a worker does not worry about mistakenly connecting a strong current to a connection terminal of the current collection device, and the phenomenon of burning the current collection device occurs. Obviously, the safety and the reliability of the current collecting device in the using process are guaranteed, and the overall reliability of the distributed control system in the operation process can be further guaranteed.
The distributed control system disclosed by the embodiment has the beneficial effects of the current collecting device disclosed in the foregoing.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above detailed description of the current collecting device and the distributed control system provided by the present invention is provided, and a specific example is applied in the present document to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A current collection device, comprising: the electric current collection device body, be provided with power supply terminal and signal access terminal on the electric current collection device body, its characterized in that still includes: the circuit comprises a first diode, a second diode, a thermosensitive element, a first fuse, a second fuse, a transient suppression diode and an NMOS tube;
the power supply terminal is connected with the cathode of a first diode, the anode of the first diode is connected with the first end of the thermosensitive element, the second end of the thermosensitive element is respectively connected with the cathode of a second diode and the first end of the first fuse, the anode of the second diode is grounded, and the second end of the first fuse is connected with a protection circuit in the current collection device body;
the signal access terminal is connected with a first end of the second fuse, a second end of the second fuse is respectively connected with an anode of the transient suppression diode and a drain electrode of the NMOS tube, a cathode of the transient suppression diode is grounded, a source electrode of the NMOS tube is connected with a sampling circuit in the current acquisition device body, and a grid electrode of the NMOS tube is used for receiving a target voltage triggering the NMOS tube to work.
2. The current collection device according to claim 1, wherein the first fuse is in particular a square fuse.
3. The current collection device according to claim 1, wherein the second fuse is in particular a self-healing fuse.
4. The current-collecting device of claim 1, further comprising: a first capacitor and a second capacitor;
the first end of the first capacitor is connected with the power supply terminal, and the second end of the first capacitor is grounded; and the first end of the second capacitor is connected with the signal access terminal, and the second end of the second capacitor is grounded.
5. The current-collecting device of claim 1, further comprising: a third capacitor;
the first end of the third capacitor is connected with the connecting line of the power supply terminal, and the second end of the third capacitor is connected with the connecting line of the signal access terminal.
6. The current-collecting device of claim 1, further comprising: a fourth capacitor;
the first end of the fourth capacitor is connected with the anode of the transient suppression diode, and the second end of the fourth capacitor is grounded.
7. The current collection device according to any one of claims 1 to 6, further comprising: magnetic beads;
the first end of the magnetic bead is connected with the power supply terminal, and the second end of the magnetic bead is connected with the negative electrode of the first diode.
8. A distributed control system comprising a current collection apparatus as claimed in any one of claims 1 to 7.
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| 车载监控终端电源的浪涌抑制电路设计;洪炳林;《无线互联科技》;20171031;第76-77页 * |
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| CN110456132A (en) | 2019-11-15 |
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