CN212726472U - Communication equipment switching value output type explosion-proof safety barrier - Google Patents
Communication equipment switching value output type explosion-proof safety barrier Download PDFInfo
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- CN212726472U CN212726472U CN202022066465.0U CN202022066465U CN212726472U CN 212726472 U CN212726472 U CN 212726472U CN 202022066465 U CN202022066465 U CN 202022066465U CN 212726472 U CN212726472 U CN 212726472U
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Abstract
The explosion-proof safety barrier can limit the energy of switching value equipment, and at the same time can make explosion-proof treatment, and can limit the energy on the data line when the switching value signal is transferred into dangerous site, so that it is not enough to ignite explosive mixture, and at the same time can electrically isolate two equipments so as to raise the anti-interference property and safety of industrial control network. For example, if the electromagnetic valve is electrically connected to a non-explosion natural gas on-off controller, reliable communication guarantee can be realized by adding the electromagnetic valve provided by the invention, switching value signals of the controller are transmitted to field equipment and simultaneously subjected to explosion-proof treatment, any switching value signal in the controller is transmitted to the field, the energy on a line is not enough to ignite explosive mixtures, and meanwhile, the two equipment are electrically isolated, so that the safety and the reliability of industrial control are enhanced.
Description
Technical Field
The invention relates to a signal isolation safety device, in particular to a switching value output type explosion-proof safety barrier of communication equipment, which can perform voltage limiting and current limiting energy control and electrical isolation on a switching value control circuit when a controller sends a downlink control instruction between field execution mechanisms, ensures the reliability of the transmission circuit in an automatic control occasion with explosive factors, realizes automatic control and remote operation, and can ensure signal isolation transmission and explosion-proof processing.
Background
With the continuous improvement of the industrial automation degree, the application of automatic control is higher and higher, and the downlink control instruction of the controller is indispensable for controlling the on-off of the field device. However, when an explosive factor exists, the electric arc can be caused by directly powering off the equipment, and the ignition caused by overlarge current can occur when the equipment is directly powered on, so that the situation is not allowed in an explosive environment, and the safety of life and property cannot be guaranteed. Ordinary switching value signals can not be directly used in places with explosive dangers, for example, in the fields of coal, petrochemical industry, natural gas and the like, when the switching value signals are switched on and off in the fields, lines are struck, explosive combustible materials are ignited, and the dangers are extremely high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a switching value output type explosion-proof safety barrier of communication equipment, which can perform voltage limiting and current limiting energy control and electrical isolation on a switching value control circuit when a controller sends a downlink control instruction between field execution mechanisms, ensures the reliability of a transmission line in an automatic control situation with explosive factors, realizes automatic control and remote operation, and can ensure signal isolation transmission and explosion-proof processing.
The technical scheme adopted by the invention for solving the technical problems is as follows: a switching value output type explosion-proof safety barrier of communication equipment comprises an input end power supply management circuit, a transformer output rectifying filter circuit and an explosion-proof processing circuit of an intrinsic safety end, wherein the input end power supply management circuit consists of a pulse width modulation chip U3, a transformer U1, an input terminal U2C and an on-off signal indicator lamp D8, the input terminal U2C transmits signals to a pulse width modulation chip U3, the pulse width modulation chip U3 controls a primary side coil of the transformer U1, the transformer U1 feeds back coil feedback signals to a pulse width modulation chip U3, the voltage stabilizing function can be achieved, the transformer output rectifying filter circuit outputs signals to the rectifying filter circuit through a secondary side coil of the transformer U1, the signals are rectified and filtered and then transmitted to the explosion-proof processing circuit of the intrinsic safety end, and then the signals are output through an output terminal U2A.
The invention has the advantages that the invention can provide the switching value output type explosion-proof safety barrier of the communication equipment, can limit the energy of the switching value equipment, simultaneously carry out explosion-proof treatment, limit the energy on a data line when a switching value signal is transmitted to a dangerous site, ensure that the energy is not enough to ignite explosive mixtures, simultaneously electrically isolate the two equipment, and enhance the anti-interference performance and the safety of an industrial control network. For example, if the electromagnetic valve is electrically connected to a non-explosion natural gas on-off controller, reliable communication guarantee can be realized by adding the electromagnetic valve provided by the invention, switching value signals of the controller are transmitted to field equipment and simultaneously subjected to explosion-proof treatment, any switching value signal in the controller is transmitted to the field, the energy on a line is not enough to ignite explosive mixtures, and meanwhile, the two equipment are electrically isolated, so that the safety and the reliability of industrial control are enhanced.
Drawings
The structure and characteristics of the switching value output type explosion-proof safety barrier for communication equipment according to the present invention will be further described with reference to the accompanying drawings and embodiments, wherein:
fig. 1 is a circuit diagram of a first embodiment of the present invention.
Fig. 2 is a block circuit schematic diagram of a first embodiment of the present invention.
In the figure: u1. transformer, U3. pulse width modulation chip, U2C input terminal, U2A output terminal, D8. on-off signal indicator lamp, Q1. reference source and Q2 field effect transistor.
Detailed Description
In the embodiment shown in fig. 1, a transformer (U1), a pulse width modulation chip (U3), an input terminal (U2C), an output terminal (U2A), an on-off signal indicator lamp (D8), a reference source (Q1) and a field effect transistor (Q2) are provided.
In the embodiment shown in fig. 2, the circuit principle of the present invention is labeled as follows: the safety side switching value signal is input into the power supply management circuit, the signal adjusted by the power supply management circuit is input into the pulse width modulation chip, the signal is isolated by the pulse width modulation chip and the high-frequency transformer, rectified and filtered, and then input into the explosion-proof processing circuit, and the signal can be connected to the dangerous side switching value signal after explosion-proof processing, so that the safety purpose is achieved.
The invention relates to a communication equipment switching value output type explosion-proof safety barrier, which comprises an input end power supply management circuit, a transformer output rectifying and filtering circuit and an explosion-proof processing circuit at an intrinsic safety end, wherein the input end power supply management circuit is composed of a pulse width modulation chip (U3), the transformer (U1), input terminal (U2C) and break-make signal indicator lamp (D8) are constituteed, input terminal (U2C) signal transmission is to pulse width modulation chip (U3), pulse width modulation chip (U3) control transformer (U1) primary coil, transformer (U1) feedback coil feedback signal gives pulse width modulation chip (U3), can realize the function of stabilizing voltage, transformer output rectifier filter circuit is given rectifier filter circuit by transformer (U1) secondary winding output signal, the signal is given the explosion-proof processing circuit of this ampere's end after rectifier filter, then export via output terminal (U2A).
According to the communication equipment switching value output type explosion-proof safety grid, the 6 th pin of an input terminal (U2C) is electrically connected with the negative pole GND of a non-intrinsic safety end power supply, the 5 th pin of the input terminal (U2C) is electrically connected with a capacitor (C5) and a fuse (F2), the other end of the capacitor (C5) is electrically connected with the negative pole GND of the non-intrinsic safety end power supply, the other end of the fuse (F2) is electrically connected with the positive pole of a diode (Q3), the negative pole of the diode (Q3) is electrically connected with the positive pole of an electrolytic capacitor (C7), a resistor (R10), the collector of a triode (Q4), a resistor (R7) and the 12 th pin of a transformer (U1) and the positive pole VCC of the non-intrinsic safety end power supply, the negative pole of the electrolytic capacitor (C7) is electrically connected with the negative pole GND of the non-intrinsic safety end power supply, the other end of the resistor (R10) is electrically connected with the base of the triode (Q4) and the negative pole of the diode (D7), the positive pole of the diode (D7) is electrically connected The power supply circuit comprises a 7-pin VCC, a negative electrode end of a capacitor (C9) is electrically connected with a negative electrode GND of a non-intrinsic safety end power supply, the other end of a resistor (R7) is electrically connected with a resistor (R9) and a 6 th pin UV of a pulse width modulation chip (U3), the other end of a resistor (R9) is electrically connected with a resistor (R13) and a 5 th pin OV of the pulse width modulation chip (U3), the other end of a resistor (R13) is electrically connected with a negative electrode GND of the non-intrinsic safety end power supply, and the 8 th pin VD of the pulse width modulation chip (U3) is electrically connected with a 11.
In the communication equipment switching value output type explosion-proof safety barrier, a 4 th pin CMP of a pulse width modulation chip (U3) is electrically connected with a resistor (R12) and a capacitor (C6), the other end of the resistor (R12) is electrically connected with a capacitor (C8), the other end of the capacitor (C8) is electrically connected with the other end of a capacitor (C6), a resistor (R8), a resistor (R11) and a 3 rd pin FB of the pulse width modulation chip (U3), a 2 nd pin CT of the pulse width modulation chip (U3) is electrically connected with a capacitor (C4), the other end of the capacitor (C4) is electrically connected with a capacitor (C3), a 1 st pin GND and a non-intrinsic safety end power supply cathode GND of the pulse width modulation chip (U3), a 10 th pin of a transformer (U1) is electrically connected with the non-intrinsic safety end power supply cathode GND, a 9 th pin of the transformer (U1) is electrically connected with a diode (D2), the cathode end of the diode (D2) is electrically connected with the other end of the, the other end of the resistor (R11) is electrically connected with the negative pole GND of the non-intrinsic safety end power supply.
The invention relates to a switching value output type explosion-proof safety grid of communication equipment, wherein a 1 st pin of a transformer (U1) is electrically connected with a positive terminal of a diode (D1), a negative terminal of the diode (D1) is electrically connected with a positive terminal of an electrolytic capacitor (C1), a capacitor (C2), a resistor (R5), a fuse (F1) and a positive terminal VO of a local-safety-end power supply, the positive terminal VO of the local-safety-end power supply is electrically connected with a resistor (R7), the other terminal of the resistor (R7) is electrically connected with a positive terminal of an on-off signal indicator lamp (D8), a negative terminal of the on-off signal indicator lamp (D8) is electrically connected with a negative terminal GO of the local-safety-end power supply, a 2 nd pin of a transformer (U1) is electrically connected with a negative terminal of the electrolytic capacitor (C1), the other terminal of the capacitor (C2), a positive terminal of a reference source (Q1) and a resistor (R6), a reference source (Q636) controls an extreme terminal of an electric resistor (R6), a positive, the negative end of a reference source (Q1) is electrically connected with the other end of a resistor (R5), the negative end of a diode (D3) and the source end of a field effect tube (Q2), the other end of a fuse (F1) is electrically connected with the negative end of a Zener diode (D4), the negative end of the Zener diode (D5), the negative end of the Zener diode (D6), a resistor (R1) and a resistor (R3), the other end of a resistor (R1) is electrically connected with the other end of a resistor (R3), a resistor (R2) and a resistor (R4), the other end of a resistor (R2) is electrically connected with the other end of the resistor (R4) and the 1 st pin of an output terminal (U2A), and the drain end of the field effect tube (Q2) is electrically connected with the positive end of the Zener diode (D4), the positive end of the Zener diode (D5), the positive end of the Zener diode (D6) and the 2 nd.
The communication equipment switching value output type explosion-proof safety barrier can limit the energy of switching value equipment, simultaneously carry out explosion-proof treatment, limit the energy on a data line when a switching value signal is transmitted to a dangerous site, ensure that the energy is not enough to ignite explosive mixtures, simultaneously electrically isolate the two equipment, and enhance the anti-interference performance and the safety of an industrial control network. For example, if the electromagnetic valve is electrically connected to a non-explosion natural gas on-off controller, reliable communication guarantee can be realized by adding the electromagnetic valve provided by the invention, switching value signals of the controller are transmitted to field equipment and simultaneously subjected to explosion-proof treatment, any switching value signal in the controller is transmitted to the field, the energy on a line is not enough to ignite explosive mixtures, and meanwhile, the two equipment are electrically isolated, so that the safety and the reliability of industrial control are enhanced.
The communication equipment switching value output type explosion-proof safety barrier receives a switching value signal from a safety area, isolates an explosion-proof treatment and transmits the signal to equipment in a dangerous area, and can control the output of an intrinsic safety end through a dry contact, an open-circuit signal of a collector or a logic level signal to drive the intrinsic safety end low-power equipment or other unit combination instruments in the dangerous area. Such as electromagnetic valve, audible and visual alarm, etc. The input, the output and the power supply are isolated from each other at three ends, so that the interference of an industrial complex environment can be resisted, the reliability and the safety are improved, the requirements of II C-level intrinsic safety and explosion prevention are met, the output stability is high, and the production operation safety in a flammable and explosive environment can be protected. The safety barrier and the dangerous area are separated, the energy on the transmission line is limited in a safe range, and the safety barrier is very convenient and practical.
The invention has good effect.
Claims (4)
1. A communication equipment switching value output type explosion-proof safety barrier comprises an input end power supply management circuit, a transformer output rectifying and filtering circuit and an intrinsic safety end explosion-proof processing circuit, and is characterized in that the input end power supply management circuit is composed of a pulse width modulation chip U3, a transformer U1, an input terminal U2C and an on-off signal indicator lamp D8, the input terminal U2C transmits signals to the pulse width modulation chip U3, the pulse width modulation chip U3 controls a primary coil of the transformer U1, a feedback coil of the transformer U1 feeds back signals to the pulse width modulation chip U3, the function of stabilizing voltage can be achieved, the transformer output rectifying and filtering circuit outputs signals to the rectifying and filtering circuit through a secondary coil of the transformer U1, the signals are rectified and filtered and then transmitted to the intrinsic safety end explosion-proof processing circuit, and then are output to an on-site dangerous area through an output terminal U2A.
2. The switching value output type explosion-proof safety barrier of communication equipment according to claim 1, wherein the 6 th pin of the input terminal U2C is electrically connected to the negative electrode GND of the non-intrinsic safety end power supply, the 5 th pin of the input terminal U2C is electrically connected to the capacitor C5 and the fuse F2, the other end of the capacitor C5 is electrically connected to the negative electrode GND of the non-intrinsic safety end power supply, the other end of the fuse F2 is electrically connected to the positive electrode terminal of the diode Q3, the negative electrode terminal of the diode Q3 is electrically connected to the positive electrode terminal of the electrolytic capacitor C7, the resistor R10, the collector of the triode Q4, the resistor R7, the 12 th pin of the transformer U1 and the positive electrode VCC of the non-intrinsic safety end power supply, the negative electrode GND of the electrolytic capacitor C7 is electrically connected to the negative electrode GND of the non-intrinsic safety end power supply, the other end of the resistor R10 is electrically connected to the base of the triode Q4 and the negative electrode terminal of the diode D7, the positive electrode, the negative electrode end of the capacitor C9 is electrically connected with a non-intrinsic safety end power supply negative electrode GND, the other end of the resistor R7 is electrically connected with the resistor R9 and a 6 th pin UV of the pulse width modulation chip U3, the other end of the resistor R9 is electrically connected with the resistor R13 and a 5 th pin OV of the pulse width modulation chip U3, the other end of the resistor R13 is electrically connected with the non-intrinsic safety end power supply negative electrode GND, and an 8 th pin VD of the pulse width modulation chip U3 is electrically connected with a 11 th pin VD.
3. The switching value output type explosion-proof safety barrier of communication equipment as claimed in claim 1, wherein the 4 th pin CMP of the pulse width modulation chip U3 is electrically connected with the resistor R12 and the capacitor C6, the other end of the resistor R12 is electrically connected with the capacitor C8, the other end of the capacitor C8 is electrically connected with the other end of the capacitor C6, the resistor R8, the resistor R11 and the 3 rd pin FB of the pulse width modulation chip U3, the 2 nd pin CT of the pulse width modulation chip 737u 6 is electrically connected with the capacitor C4, the other end of the capacitor C4 is electrically connected with the capacitor C3, the 1 st pin GND of the pulse width modulation chip U3 and the non-intrinsic-ampere-end power supply negative GND, the 10 th pin of the transformer U1 is electrically connected with the non-intrinsic-ampere-end GND, the 9 th pin of the transformer U1 is electrically connected with the positive terminal of the diode D2, the negative terminal of the diode D2 is electrically connected with the other end of the capacitor C3 and.
4. The switching value output type explosion-proof safety grid for communication equipment as claimed in claim 1, wherein the 1 st pin of the transformer U1 is electrically connected with the positive terminal of a diode D1, the negative terminal of the diode D1 is electrically connected with the positive terminal of an electrolytic capacitor C1, a capacitor C2, a resistor R5, a fuse F1 and the positive terminal VO of a power supply at the intrinsic safety end, the positive terminal VO of the power supply at the intrinsic safety end is electrically connected with a resistor R7, the other terminal of the resistor R7 is electrically connected with the positive terminal of an on-off signal indicator lamp D8, the negative terminal of the on-off signal indicator lamp D8 is electrically connected with the negative terminal GO of the power supply at the intrinsic safety end, the 2 nd pin of the transformer U1 is electrically connected with the negative terminal of an electrolytic capacitor C1, the other terminal of a capacitor C2, the positive terminal of a reference power supply Q1 and a resistor R6, the extreme of the reference power supply Q1 controls the other terminal to be electrically connected with the other terminal of the power supply R6, the negative end of the diode D3, the source end of the field effect transistor Q2, the other end of the fuse F1 is electrically connected with the negative end of the Zener diode D4, the negative end of the Zener diode D5, the negative end of the Zener diode D6, the resistor R1 and the resistor R3, the other end of the resistor R1 is electrically connected with the other end of the resistor R3, the resistor R2 and the resistor R4, the other end of the resistor R2 is electrically connected with the other end of the resistor R4 and the 1 st pin of the output terminal U2A, and the Zener drain end of the field effect transistor Q2 is electrically connected with the positive end of the diode D4, the positive end of the Zener diode D5, the positive end of the Zener diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022066465.0U CN212726472U (en) | 2020-09-09 | 2020-09-09 | Communication equipment switching value output type explosion-proof safety barrier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022066465.0U CN212726472U (en) | 2020-09-09 | 2020-09-09 | Communication equipment switching value output type explosion-proof safety barrier |
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| CN212726472U true CN212726472U (en) | 2021-03-16 |
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| CN202022066465.0U Active CN212726472U (en) | 2020-09-09 | 2020-09-09 | Communication equipment switching value output type explosion-proof safety barrier |
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