CN211701474U - Isolated signal lightning protection device - Google Patents
Isolated signal lightning protection device Download PDFInfo
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- CN211701474U CN211701474U CN202020154108.7U CN202020154108U CN211701474U CN 211701474 U CN211701474 U CN 211701474U CN 202020154108 U CN202020154108 U CN 202020154108U CN 211701474 U CN211701474 U CN 211701474U
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Abstract
The utility model relates to a lightning protection device field discloses an isolated signal lightning protection device, including RS485 signal coding circuit, electro-optical conversion circuit, first microprocessor, optic fibre, photoelectric conversion circuit, RS485 signal decoding circuit, second microprocessor, first power module and second power module, RS485 signal coding circuit is connected with electro-optical conversion circuit, RS485 signal coding circuit and electro-optical conversion circuit all are connected with first microprocessor; the first power module comprises an alternating current input end, a fuse, a first capacitor, a fourth diode, a first triode, a first resistor, a second triode, a second capacitor, a first diode, a second diode, a third capacitor, a fourth capacitor, a transformer, a third diode, a fifth capacitor, a second resistor and a voltage output end. The utility model discloses circuit structure is comparatively simple, the cost is lower, the security and the reliability of convenient maintenance, circuit are higher.
Description
Technical Field
The utility model relates to a lightning protection device field, in particular to isolated signal lightning protection device.
Background
The signal lightning protector is lightning protection equipment specially used for network, communication, optical cable, broadcasting, television, monitoring, video and other signal equipment. The signal lightning protection device is divided into B, C, F grades according to the requirements of IEC 61644 on the design of products. Class B (Base protection) basic protection level (coarse protection level), class C (Combination protection) combined protection level, class F (Medium & fine protection) Medium & fine protection level. Fig. 1 is a schematic circuit diagram of a power supply portion of a conventional signal lightning arrester, and it can be seen from fig. 1 that the power supply portion of the conventional signal lightning arrester uses many components and parts, has a complex circuit structure, has a high hardware cost, and is inconvenient to maintain. In addition, the power supply part of the traditional signal lightning protector lacks corresponding circuit protection functions, such as: the safety and reliability of the circuit are poor due to the lack of the current-limiting protection function.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a circuit structure comparatively simple, the cost is lower, the security and the higher isolated signal lightning protection device of reliability of convenient maintenance, circuit.
The utility model provides a technical scheme that its technical problem adopted is: an isolated signal lightning protector is constructed and comprises an RS485 signal coding circuit, an electro-optical conversion circuit, a first microprocessor, an optical fiber, an electro-optical conversion circuit, an RS485 signal decoding circuit, a second microprocessor, a first power module and a second power module, wherein the RS485 signal coding circuit is connected with the electro-optical conversion circuit, the RS485 signal coding circuit and the electro-optical conversion circuit are both connected with the first microprocessor, the electro-optical conversion circuit is connected with the electro-optical conversion circuit through the optical fiber, the RS485 signal decoding circuit is connected with the electro-optical conversion circuit, the electro-optical conversion circuit and the RS485 signal decoding circuit are both connected with the second microprocessor, the first power module is connected with the first microprocessor, and the second power module is connected with the second microprocessor;
the first power module comprises an alternating current input end, a fuse, a first capacitor, a fourth diode, a first triode, a first resistor, a second triode, a second capacitor, a first diode, a second diode, a third capacitor, a fourth capacitor, a transformer, a third diode, a fifth capacitor, a second resistor and a voltage output end, one end of the alternating current input end is respectively connected with one end of the first capacitor, the anode of the fourth diode, one end of the third capacitor and one end of a primary coil of the transformer, a collector of the first triode is respectively connected with the other end of the third capacitor and the other end of the primary coil of the transformer, a base of the first triode is respectively connected with the cathode of the fourth diode, the collector of the second triode and one end of the second capacitor, and an emitter of the first triode is respectively connected with one end of the first resistor, The anode of the first diode is connected with the base electrode of the second triode, and the other end of the second capacitor is respectively connected with the cathode of the second diode and one end of the feedback coil of the transformer;
the cathode of the first diode is connected with one end of the fourth capacitor and the other end of the feedback coil of the transformer respectively, the other end of the alternating current input end is connected with the other end of the first capacitor, the other end of the first resistor, the emitting electrode of the second triode, the anode of the second diode and the other end of the fourth capacitor through the fuse respectively, one end of the secondary coil of the transformer is connected with one end of the fifth capacitor, one end of the second resistor and the voltage output end respectively, the other end of the secondary coil of the transformer is connected with the cathode of the third diode, and the anode of the third diode is connected with the other end of the fifth capacitor and the other end of the second resistor respectively.
In the isolated signal lightning arrester of the present invention, the model of the fourth diode is S-352T.
In the isolated signal lightning protection device of the present invention, the first power module further includes a third resistor, one end of the third resistor is connected to the emitter of the first triode, and the other end of the third resistor is connected to one end of the first resistor.
In the isolated signal lightning arrester of the present invention, the resistance of the third resistor is 25k Ω.
In the isolated signal lightning protection device of the present invention, the first transistor is an NPN-type transistor.
In the isolated signal lightning protection device of the present invention, the second triode is an NPN-type triode.
Implement the utility model discloses an isolated signal lightning protection device has following beneficial effect: the RS485 signal encoding circuit, the electro-optical conversion circuit, the first microprocessor, the optical fiber, the photoelectric conversion circuit, the RS485 signal decoding circuit, the second microprocessor, the first power module and the second power module are arranged, the first power module comprises an alternating current input end, a fuse, a first capacitor, a fourth diode, a first triode, a first resistor, a second triode, a second capacitor, a first diode, a second diode, a third capacitor, a fourth capacitor, a transformer, a third diode, a fifth capacitor, a second resistor and a voltage output end, compared with a power supply part of a traditional signal lightning protector, the first power module uses fewer components, saves some components, can reduce hardware cost, and in addition, the fourth diode is used for current limiting protection, so the circuit structure is simpler, the cost is lower, and the maintenance is convenient, The safety and the reliability of the circuit are higher.
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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic circuit diagram of a power supply portion of a conventional signal lightning protector;
fig. 2 is a schematic structural diagram of an embodiment of the isolated signal lightning protection device of the present invention;
fig. 3 is a schematic circuit diagram of the first power supply module in the embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the embodiment of the isolated signal lightning protection device of the present invention, a schematic structural diagram of the isolated signal lightning protection device is shown in fig. 2. In fig. 2, the isolated signal lightning protection device includes an RS485 signal encoding circuit 1, an electro-optical conversion circuit 2, a first microprocessor 3, an optical fiber 4, a photoelectric conversion circuit 5, an RS485 signal decoding circuit 6, a second microprocessor 7, a first power module 8 and a second power module 9, wherein the RS485 signal encoding circuit 1 is connected with the electro-optical conversion circuit 2, the RS485 signal encoding circuit 1 and the electro-optical conversion circuit 2 are both connected with the first microprocessor 3, the electro-optical conversion circuit 2 is connected with the photoelectric conversion circuit 5 through the optical fiber, the RS485 signal decoding circuit 6 is connected with the photoelectric conversion circuit 5, the photoelectric conversion circuit 5 and the RS485 signal decoding circuit 6 are both connected with the second microprocessor 7, the first power module 8 is connected with the first microprocessor 3, and the second power module 9 is connected with the second microprocessor 7.
The electro-optical conversion circuit 2 may be a circuit including an electro-optical conversion device, and converts an electrical signal into an optical signal by the electro-optical conversion circuit 21, so that the optical signal can be transmitted over the optical fiber 4. The photoelectric conversion circuit 5 converts the optical signal into an electrical signal, thereby enabling the electrical signal to be switched in the photoelectric conversion circuit 5. The length of the optical fiber 4 is adapted to the isolation voltage class of the isolated signal lightning protector. The higher the isolation voltage level, the longer the length of the optical fiber 4.
The input signal of the electro-optical conversion circuit 2 is isolated from the output signal of the photoelectric conversion circuit 5 through the optical fiber 4, so that the electric signal is transmitted in a short optical path in the optical fiber 4, a circuit through which high voltage generated by thunder flows is cut off, the high voltage generated by the thunder is isolated on one side of the isolated signal lightning protector, and the electronic equipment is prevented from being damaged. Since the signal propagates through the optical fiber 4 as an optical signal, there is no need to propagate through a metal wire signal line, and even if the lightning is multi-pulse discharge, if the optical fiber 4 cannot be broken down, the optical fiber 4 cannot be penetrated by a plurality of discharges. Meanwhile, the optical fiber 4 has no recovery problem under the non-breakdown condition, and the problem of voltage leakage after the lightning high voltage is over can not be caused.
The first microprocessor 3 receives the optical signal transmitted through the electro-optical conversion circuit 2, performs coding control on the optical signal, and converts the output optical signal into a binary signal, thereby being capable of more conveniently performing subsequent processing. The second microprocessor 7 receives the optical signal transmitted through the photoelectric conversion circuit 5, and performs decoding control on the optical signal, so that the output optical signal is more conveniently subjected to subsequent processing. By arranging the first microprocessor 3 and the second microprocessor 7, the encoding and decoding control is carried out on the electro-optical conversion circuit 2 and the photoelectric conversion circuit 5, and meanwhile, the signal sending of the electro-optical conversion circuit 2 and the signal receiving of the photoelectric conversion circuit 5 are controlled, so that the automation level of the isolated signal lightning protector is improved.
In this embodiment, the RS485 signal encoding circuit 1, the electro-optical conversion circuit 2, the first microprocessor 3, the optical fiber 4, the photoelectric conversion circuit 5, the RS485 signal decoding circuit 6, the second microprocessor 7, and the second power module 9 are all implemented by using a structure in the prior art, and the working principle thereof is also a structure in the prior art, which is not described in detail herein.
Fig. 3 is a schematic circuit diagram of a first power module in this embodiment, in fig. 3, the first power module 8 includes an AC input terminal AC, a fuse FU, a first capacitor C1, a fourth diode D4, a first transistor Q1, a first resistor R1, a second transistor Q2, a second capacitor C2, a first diode D1, a second diode D2, a third capacitor C3, a fourth capacitor C4, a transformer T, a third diode D3, a fifth capacitor C5, a second resistor R2, and a voltage output Vo, wherein one end of the AC input terminal AC is connected to one end of the first capacitor C1, an anode of the fourth diode D4, one end of the third capacitor C3, and one end of a primary winding of the transformer T, collectors of the first transistor Q1 are connected to the other end of the third capacitor C3 and the other end of the primary winding of the transformer T, and bases of the first transistor Q1 are connected to cathodes 4 of the fourth diode D4, The collector of the second triode Q2 is connected with one end of the second capacitor C2, the emitter of the first triode Q1 is connected with one end of the first resistor R1, the anode of the first diode D1 and the base of the second triode Q2, respectively, and the other end of the second capacitor C2 is connected with the cathode of the second diode D2 and one end of the feedback coil of the transformer T, respectively.
The cathode of the first diode D1 is connected to one end of a fourth capacitor C4 and the other end of a feedback coil of the transformer T, the other end of the AC input terminal AC is connected to the other end of the first capacitor C1, the other end of the first resistor R1, the emitter of the second triode Q2, the anode of the second diode D2 and the other end of the fourth capacitor C4 through a fuse FU, one end of the secondary coil of the transformer T is connected to one end of the fifth capacitor C5, one end of the second resistor R2 and the voltage output terminal Vo, the other end of the secondary coil of the transformer T is connected to the cathode of the third diode D3, and the anode of the third diode D3 is connected to the other end of the fifth capacitor C5 and the other end of the second resistor R2.
Compared with the power supply part of the traditional signal lightning protector in fig. 1, the first power module 8 has the advantages of fewer used components, simpler circuit structure, convenience in maintenance and capability of reducing hardware cost due to the fact that some components are saved. In addition, the fourth diode D4 is a current limiting diode for current limiting protection. The current limiting protection principle is as follows: when the current of the branch in which the fourth diode D4 is located is large, the current of the branch in which the fourth diode D4 is located can be reduced by the fourth diode D4, so that the branch is kept in a normal operating state, and the components in the circuit are not burned out due to too large current, so that the safety and reliability of the circuit are high. It should be noted that in the present embodiment, the model of the fourth diode D4 is S-352T. Of course, in practical applications, the fourth diode D may be another type of diode having the same function.
The working principle of the first power supply module 8 is as follows: after the power supply is switched on, the first capacitor C1 has a dc voltage of about 380V, the base of the first triode Q1 provides a current, the emitter of the first triode Q1 has a current detection resistor, i.e., a first resistor R1, and after the base of the first triode Q1 is powered on, a collector current is generated through the primary coil of the transformer T, and an induced voltage is generated on the feedback coil of the transformer and the secondary coil of the transformer T. The output of the secondary coil of the transformer T is rectified by a third diode D3, filtered by a fifth capacitor C5 and then connected with a voltage output end Vo to supply power to a load.
The feedback coil of the transformer T is rectified by a second diode D2, filtered by a second capacitor C2 and then passes through a first diode D1 and a second triode Q2 to form a sampling comparison circuit, the output voltage is detected to be high and low, the feedback coil of the transformer T and the second capacitor C2 also form a positive feedback circuit of a first triode Q1, the first triode Q1 works in high-frequency oscillation and continuously supplies power to a primary coil switch of the transformer T, when the output voltage is increased due to any reason such as light load or high power voltage, the sampling comparison between the feedback coil of the transformer T and the first diode D1 leads to the conduction of the second triode Q2, the base current of the first triode Q1 is reduced, the collector current of the first triode Q1 is reduced, the load capacity is reduced, so that the output voltage is reduced, the second triode Q2 is cut off after sampling, the load capacity of the first triode Q1 is enhanced, the output voltage will rise again, thus playing the role of automatic voltage stabilization.
When the load is overloaded or short-circuited, the collector current of the first triode Q1 is greatly increased, the first resistor R1 generates a higher voltage drop, the high voltage generated by the overload or short-circuit enables the second triode Q2 to be conducted in a saturated mode, the fifth capacitor C5 plays a role of an accelerating capacitor, the second triode Q2 can be conducted in the fastest time, and therefore the first triode Q1 is cut off to stop outputting, so that overload damage is avoided. Varying the magnitude of the first resistor R1 may vary the load capacity.
The first transistor Q1 operates in a switching state, when the first transistor Q1 is turned off, the transformer T may generate a high electromagnetic induction voltage, and in the absence of a load, a high voltage may be induced at the collector of the first transistor Q1, which may be as high as 800 v or more, which may cause the first transistor Q1 to break down, and the second resistor R2 may prevent the circuit from being under no-load condition, so that the first transistor Q1 may not be damaged by the high voltage breakdown of the collector.
In this embodiment, the first transistor Q1 is an NPN transistor, and the second transistor Q2 is an NPN transistor. Certainly, in practical applications, the first transistor Q1 and the second transistor Q2 may both adopt PNP transistors, but the circuit structure is also changed accordingly.
In this embodiment, the first power module 8 further includes a third resistor R3, one end of the third resistor R3 is connected to the emitter of the first transistor Q1, and the other end of the third resistor R3 is connected to one end of the first resistor R1. The third resistor R3 is a current limiting resistor, and is used for current limiting protection of the emitter current of the first transistor Q1. The current limiting protection principle is as follows: when the emitter current of the first triode Q1 is large, the third resistor R3 can reduce the emitter current of the first triode Q1 to keep the first triode Q1 in a normal working state, so that the elements in the circuit are not burnt out due to too large current, and the safety and reliability of the circuit are further enhanced. It should be noted that, in the present embodiment, the resistance of the third resistor R3 is 25k Ω. Of course, in practical applications, the resistance of the third resistor R3 may be increased or decreased according to specific situations.
In a word, in this embodiment, compared with the power supply part of the conventional signal lightning protector, the first power module 8 uses fewer components, has a simpler circuit structure, is convenient to maintain, and can reduce the hardware cost due to the fact that some components are saved. In addition, the first power module 8 is provided with a current-limiting diode, so that the safety and the reliability of the circuit are high.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An isolated signal lightning protection device is characterized by comprising an RS485 signal coding circuit, an electro-optic conversion circuit, a first microprocessor, an optical fiber, an electro-optic conversion circuit, an RS485 signal decoding circuit, a second microprocessor, a first power module and a second power module, wherein the RS485 signal coding circuit is connected with the electro-optic conversion circuit, the RS485 signal coding circuit and the electro-optic conversion circuit are both connected with the first microprocessor, the electro-optic conversion circuit is connected with the electro-optic conversion circuit through the optical fiber, the RS485 signal decoding circuit is connected with the electro-optic conversion circuit, the electro-optic conversion circuit and the RS485 signal decoding circuit are both connected with the second microprocessor, the first power module is connected with the first microprocessor, and the second power module is connected with the second microprocessor;
the first power module comprises an alternating current input end, a fuse, a first capacitor, a fourth diode, a first triode, a first resistor, a second triode, a second capacitor, a first diode, a second diode, a third capacitor, a fourth capacitor, a transformer, a third diode, a fifth capacitor, a second resistor and a voltage output end, one end of the alternating current input end is respectively connected with one end of the first capacitor, the anode of the fourth diode, one end of the third capacitor and one end of a primary coil of the transformer, a collector of the first triode is respectively connected with the other end of the third capacitor and the other end of the primary coil of the transformer, a base of the first triode is respectively connected with the cathode of the fourth diode, the collector of the second triode and one end of the second capacitor, and an emitter of the first triode is respectively connected with one end of the first resistor, The anode of the first diode is connected with the base electrode of the second triode, and the other end of the second capacitor is respectively connected with the cathode of the second diode and one end of the feedback coil of the transformer;
the cathode of the first diode is connected with one end of the fourth capacitor and the other end of the feedback coil of the transformer respectively, the other end of the alternating current input end is connected with the other end of the first capacitor, the other end of the first resistor, the emitting electrode of the second triode, the anode of the second diode and the other end of the fourth capacitor through the fuse respectively, one end of the secondary coil of the transformer is connected with one end of the fifth capacitor, one end of the second resistor and the voltage output end respectively, the other end of the secondary coil of the transformer is connected with the cathode of the third diode, and the anode of the third diode is connected with the other end of the fifth capacitor and the other end of the second resistor respectively.
2. The isolated signal lightning protector of claim 1, wherein the fourth diode is model number S-352T.
3. The isolated signal lightning protector according to claim 2, wherein the first power module further comprises a third resistor, one end of the third resistor is connected to the emitter of the first transistor, and the other end of the third resistor is connected to one end of the first resistor.
4. The isolated signal lightning protector of claim 3, wherein the third resistor has a resistance of 25k Ω.
5. The isolated signal lightning protector according to any one of claims 1 to 4, wherein the first transistor is an NPN transistor.
6. The isolated signal lightning protector according to any one of claims 1 to 4, wherein the second transistor is an NPN transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020154108.7U CN211701474U (en) | 2020-02-05 | 2020-02-05 | Isolated signal lightning protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020154108.7U CN211701474U (en) | 2020-02-05 | 2020-02-05 | Isolated signal lightning protection device |
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| Publication Number | Publication Date |
|---|---|
| CN211701474U true CN211701474U (en) | 2020-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020154108.7U Active CN211701474U (en) | 2020-02-05 | 2020-02-05 | Isolated signal lightning protection device |
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| CN (1) | CN211701474U (en) |
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- 2020-02-05 CN CN202020154108.7U patent/CN211701474U/en active Active
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