Surge protection failure detection circuit for railway communication equipment
By designing a surge protection failure detection circuit for railway communication equipment, using two LED lamps and voltage stabilization tubes and other components, the problem of inconspicuous indications when surge protection equipment fails, and the reliability and stability of the equipment are improved.
Patent Information
- Application Number
- CN202411740899.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-03-04
AI Technical Summary
In the prior art, when surge protection equipment fails, it is difficult to clearly indicate, resulting in an increased risk of serious damage to the equipment.
A surge protection failure detection circuit for railway communication equipment is designed. Through the indication of two LED lamps, combined with the voltage stabilization tube and the oscillation circuit, the indication of the fuse module during normal operation is realized, and the interference of the oscillation circuit to the front-level circuit is avoided.
The normal operation of the fuse module is achieved to avoid the long-term weak current conduction state of the second LED lamp, and improve the reliability and stability of the circuit.
Smart Images
Figure CN119560972A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of railway communications, and in particular to a surge protection failure detection circuit for railway communication equipment. Background Art
[0002] In the field of railway communications, since signal equipment is related to the safety of train operation and signal equipment is precision equipment, surge protection equipment is generally configured to protect the stable and reliable operation of the equipment.
[0003] Surge protection equipment is an electronic device that provides safety protection for various electronic equipment, instruments and communication lines. It can conduct shunt in a very short time, thereby preventing surges from damaging other devices in the circuit. However, surge protection equipment may face the problem of failure. Technical personnel in this field are committed to improving the reliability of surge protection equipment and reducing the probability of its failure.
[0004] However, no matter how to improve its reliability, the surge protection device will face the problem of failure. At this time, if the failure of the surge protection device cannot be discovered in time, it will cause serious damage to the device.
[0005] How to indicate whether the surge protection device itself has failed while protecting other devices from surge damage? The commonly used method for indicating the status of a surge protector is through a window. If the window is green, it indicates that the surge protector is in normal condition. If the window is red, it indicates that the surge protector is in fault condition. This indication method is not obvious enough and it is difficult to serve as a fault warning. Summary of the invention
[0006] The purpose of the present invention is to provide a surge protection failure detection circuit for railway communication equipment.
[0007] The purpose of the present invention can be achieved by the following technical solutions:
[0008] A surge protection failure detection circuit for railway communication equipment comprises a first triode, a first current limiting protection branch, a fuse module, a second current limiting protection branch, a first LED lamp, a second LED lamp, a fifth resistor, a voltage regulator and an oscillation circuit, wherein the positive electrode of the first current limiting protection branch is connected to the positive electrode of a power supply, and the negative electrode is connected to the negative electrode of the power supply through the collector and emitter of the first triode, one end of the fuse module is connected to the positive electrode of the power supply, and the other end is connected to the positive electrode of the second current limiting protection branch, the negative electrode of the second current limiting protection branch is connected to the positive electrode of the first LED lamp, and the negative electrode is connected to the base of the first triode, the positive electrode of the voltage regulator is connected to the connection point of the first current limiting protection branch and the first triode through the fifth resistor, and the negative electrode is connected to the negative electrode of the power supply, the input end of the oscillation circuit is connected to the two ends of the voltage regulator, the output end is connected to the positive electrode of the second LED lamp, and the negative electrode of the second LED lamp is connected to the negative electrode of the power supply.
[0009] The first current limiting protection branch includes a first diode, a first resistor and a second resistor which are connected in sequence.
[0010] The second current limiting protection branch includes a second diode, a third resistor and a fourth resistor which are connected in sequence.
[0011] The fuse module includes a current fuse and a temperature fuse which are connected in sequence.
[0012] The voltage regulator tube is also connected in parallel with a filter capacitor.
[0013] The first transistor is an NPN transistor, the collector of the first transistor is connected to the cathode of the second current limiting protection branch, and the emitter is connected to the cathode of the power supply.
[0014] The oscillation circuit includes a second triode, a third triode, a ninth resistor, a charging capacitor, a seventh resistor and an eighth resistor. One end of the ninth resistor is respectively connected to the base of the second triode and the first end of the charging capacitor, and the other end is connected to the negative electrode of the power supply. The second end of the charging capacitor is connected to the negative electrode of the power supply through the seventh resistor, the collector and emitter of the third triode, one end of the sixth resistor is connected to the connection point of the seventh resistor and the third triode, and the other end is connected to the positive electrode of the voltage regulator tube, and is connected to one end of the eighth resistor through the emitter and collector of the second triode. The other end of the eighth resistor is connected to the base of the third triode.
[0015] The resistance of the ninth resistor is more than 2000 times that of the sixth resistor.
[0016] The second transistor is a PNP transistor, the emitter of the second transistor is connected to the sixth resistor, and the collector is connected to the eighth resistor.
[0017] The third transistor is an NPN transistor, the emitter of the third transistor is connected to the negative electrode of the power supply, and the collector is connected to the seventh resistor and the sixth resistor.
[0018] Compared with the prior art, the present invention has the following beneficial effects:
[0019] 1. Based on two LED lamps, and the cathode of the first LED lamp is connected to the base of the first transistor, the CE level of the first transistor cooperates with the fifth resistor to short-circuit the voltage regulator tube, and the second LED lamp is powered by the voltage at both ends of the voltage regulator tube through the oscillation circuit. Therefore, when the fuse module works normally, the first LED lamp is lit, while the second LED lamp is not lit, and the second LED lamp can be prevented from being in a weak current conduction state for a long time. Secondly, the oscillation circuit can be prevented from interfering with the previous circuit, thereby improving reliability while keeping the circuit structure simple.
[0020] 2. The ninth resistor with a very large resistance is used to prevent the current from flowing through the ninth resistor during the flashing of the second LED light, thereby improving the working stability.
[0021] 3. The oscillation circuit composed of the charging capacitor, the sixth resistor, the seventh resistor, the eighth resistor and the two-stage transistor has high working stability and long service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a structural schematic diagram of the present invention;
[0023] Among them: J3, power supply, D1, first diode, D2, second diode, D3, voltage regulator, R1, first resistor, R2, second resistor, R3, third resistor, R4, fourth resistor, R5, fifth resistor, R6, sixth resistor, R7, seventh resistor, R8, eighth resistor, R9, ninth resistor, C1, filter capacitor, C2, charging capacitor, Q1, first transistor, Q2, second transistor, Q3, third transistor, GDT1, gas discharge tube, F1, current fuse, F2, temperature fuse, LED1, lamp module. DETAILED DESCRIPTION
[0024] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.
[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0026] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "proximal", "distal", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Physical quantities in formulas, if not separately marked, should be understood as basic quantities of the base units of the International System of Units, or derived quantities derived from the basic quantities through mathematical operations such as multiplication, division, differentiation or integration.
[0027] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0029] A surge protection failure detection circuit for railway communication equipment, such as Figure 1 As shown, it includes a first triode, a first current limiting protection branch, a fuse module, a second current limiting protection branch, a first LED lamp, a second LED lamp, a fifth resistor R5, a voltage regulator D3 and an oscillation circuit. The positive electrode of the first current limiting protection branch is connected to the positive electrode of the power supply J3, and the negative electrode is connected to the negative electrode of the power supply J3 through the collector and emitter of the first triode. One end of the fuse module is connected to the positive electrode of the power supply J3, and the other end is connected to the positive electrode of the second current limiting protection branch. The negative electrode of the second current limiting protection branch is connected to the positive electrode of the first LED lamp, and the negative electrode is connected to the base of the first triode. The positive electrode of the voltage regulator D3 is connected to the connection point of the first current limiting protection branch and the first triode through the fifth resistor R5, and the negative electrode is connected to the negative electrode of the power supply J3. The input end of the oscillation circuit is connected to the two ends of the voltage regulator D3, and the output end is connected to the positive electrode of the second LED lamp, and the negative electrode of the second LED lamp is connected to the negative electrode of the power supply J3.
[0030] Based on two LED lamps, and the negative pole of the first LED lamp is connected to the base of the first transistor Q1, the CE level of the first transistor Q1 cooperates with the fifth resistor R5 to short-circuit the voltage regulator D3, and the second LED lamp is powered by the voltage at both ends of the voltage regulator D3 through the oscillation circuit. Therefore, when the fuse module works normally, the first LED lamp is lit and the second LED lamp is not lit, and the second LED lamp can be prevented from being in a weak current conduction state for a long time. Secondly, the oscillation circuit can be prevented from interfering with the previous circuit, thereby improving reliability while keeping the circuit structure simple.
[0031] In this embodiment, the first current limiting protection branch includes a first diode D1, a first resistor R1 and a second resistor R2 connected in sequence, so that the first diode D1 can play a role in preventing backflow, and the first resistor R1 and the second resistor R2 can limit current and divide voltage. In addition, the second current limiting protection branch includes a second diode D2, a third resistor R3 and a fourth resistor R4 connected in sequence, and the principle is similar to that of the first current limiting protection branch. In this embodiment, the fuse module includes a current fuse F1 and a temperature fuse F2 connected in sequence. When the surge protection device fails, one or both of the current fuse F1 and the temperature fuse F2 will be blown. In this application, when any fuse is blown, it is not conducting. In addition, in this embodiment, the first transistor Q1 is an NPN transistor, and the collector of the first transistor Q1 is connected to the negative electrode of the second current limiting protection branch, and the emitter is connected to the negative electrode of the power supply J3.
[0032] Specifically, when the fuse module is normal, the current from the positive electrode of the power supply J3 is divided into two paths, one end passes through the first current limiting protection branch to the collector of the first transistor Q1, and the other end passes through the current fuse F1 and the temperature fuse F2 through the second current limiting protection branch to power the first LED lamp. At this time, the first LED lamp will light up. Generally, the first LED lamp can be selected as a green light, which is in line with general cognition. Since the cathode of the first LED lamp is connected to the base of the first transistor Q1, at this time, when the first LED lamp is turned on, the first transistor Q1 will also At this time, the oscillation circuit is shielded. Since the power supply source of the second LED lamp is the oscillation circuit, the second LED lamp will not light up and is in an off state. Subsequently, when any one of the current fuse F1 and the temperature fuse F2 blows, the first LED lamp will not light up. At this time, the first transistor Q1 is also turned off, and the current from the first current limiting protection branch is limited to a specified voltage by the voltage regulator D3. In this embodiment, since the voltage regulator D3 is of 6.2V specification, it will be limited to 6.2V, and the input of the oscillation circuit is 6.2V.
[0033] In addition, in this embodiment, the voltage regulator tube D3 is also connected in parallel with a filter capacitor C1, which can improve the power supply quality of the oscillation circuit.
[0034] In this embodiment, the oscillation circuit includes a second triode Q2, a third triode Q3, a ninth resistor R9, a charging capacitor C2, a seventh resistor R7 and an eighth resistor R8. One end of the ninth resistor R9 is respectively connected to the base of the second triode Q2 and the first end of the charging capacitor, and the other end is connected to the negative electrode of the power supply J3. The second end of the charging capacitor C2 is connected to the negative electrode of the power supply J3 through the seventh resistor R7, and the collector and emitter of the third triode are connected to the negative electrode of the power supply J3. One end of the sixth resistor R6 is connected to the connection point of the seventh resistor R7 and the third triode Q3, and the other end is connected to the positive electrode of the voltage regulator tube D3, and is connected to one end of the eighth resistor R8 through the emitter and collector of the second triode Q2. The other end of the eighth resistor R8 is connected to the base of the third triode Q3.
[0035] The resistance of the ninth resistor R9 is more than 2000 times that of the sixth resistor R6.
[0036] In addition, the second transistor Q2 is a PNP transistor, the emitter of the second transistor Q2 is connected to the sixth resistor R6, and the collector is connected to the eighth resistor R8. The third transistor Q3 is an NPN transistor, the emitter of the third transistor Q3 is connected to the negative electrode of the power supply J3, and the collector is connected to the seventh resistor R7 and the sixth resistor R6.
[0037] Specifically, when the current fuse and the temperature fuse F2 of the oscillation circuit are not blown, the charging capacitor C2 is in an uncharged state. When either the current fuse or the temperature fuse F2 is blown, in the initial state, since the charging capacitor C2 is not fully charged, there is no current in the base of the second triode Q2, and the second triode Q2 and the third triode Q3 are both in a non-conducting state. The current from one side of the voltage regulator tube D3 charges the charging capacitor C2 via the sixth resistor R6 and the seventh resistor R7. After the charging capacitor C2 is fully charged, the base of the second triode Q2 begins to obtain current, the second triode Q2 is turned on, and the third triode Q3 is also turned on. The third transistor Q3 is turned on, thereby accelerating the discharge of the charging capacitor C2. The charging capacitor C2 is discharged through the seventh resistor R7 and the third transistor Q3 until it is discharged to the equilibrium point. The discharge of the charging capacitor C2 is cut off, the base of the second diode D2 has no current, and the third transistor Q3 is turned off. Since the power supply of the second LED lamp actually comes from the emitter of the third transistor Q3, when the third transistor Q3 is turned on, the second LED lamp will light up. Conversely, when the third transistor Q3 is not turned on, the second LED lamp will not light up, thereby forming a flashing effect of the second LED lamp. Generally, the second LED lamp can be red, which is the same as the general cognition.
[0038] The aforementioned balance point is specifically the balance point of the sixth resistor R6 and the seventh resistor R7. Figure 1The selection shown is approximately 330 / (330+165)×6.2V. In addition, in some embodiments, the first LED lamp and the second LED lamp can also be integrated into a lamp module LED1, such as Figure 1 As shown, G represents the first LED lamp, and R represents the second LED lamp.
[0039] If the above functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program code.
Claims
1. A railway communication equipment surge protection failure detection circuit, characterized in that: It includes a first triode, a first current limiting protection branch, a fuse module, a second current limiting protection branch, a first LED lamp, a second LED lamp, a fifth resistor, a voltage regulator and an oscillation circuit. The positive electrode of the first current limiting protection branch is connected to the positive electrode of a power supply, and the negative electrode is connected to the negative electrode of the power supply through the collector and emitter of the first triode. One end of the fuse module is connected to the positive electrode of the power supply, and the other end is connected to the positive electrode of the second current limiting protection branch. The negative electrode of the second current limiting protection branch is connected to the positive electrode of the first LED lamp, and the negative electrode is connected to the base of the first triode. The positive electrode of the voltage regulator is connected to the connection point of the first current limiting protection branch and the first triode through the fifth resistor, and the negative electrode is connected to the negative electrode of the power supply. The input end of the oscillation circuit is connected to the two ends of the voltage regulator, and the output end is connected to the positive electrode of the second LED lamp. The negative electrode of the second LED lamp is connected to the negative electrode of the power supply.
2. A railway communication equipment surge protection failure detection circuit according to claim 1, characterized in that: The first current limiting protection branch includes a first diode, a first resistor and a second resistor which are connected in sequence.
3. A railway communication equipment surge protection failure detection circuit according to claim 1, characterized in that: The second current limiting protection branch includes a second diode, a third resistor and a fourth resistor which are connected in sequence.
4. A railway communication equipment surge protection failure detection circuit according to claim 1, characterized in that: The fuse module includes a current fuse and a temperature fuse which are connected in sequence.
5. A railway communication equipment surge protection failure detection circuit according to claim 1, characterized in that: The voltage regulator tube is also connected in parallel with a filter capacitor.
6. A railway communication equipment surge protection failure detection circuit according to claim 1, characterized in that: The first transistor is an NPN transistor, the collector of the first transistor is connected to the cathode of the second current limiting protection branch, and the emitter is connected to the cathode of the power supply.
7. A railway communication equipment surge protection failure detection circuit according to claim 1, characterized in that: The oscillation circuit includes a second triode, a third triode, a ninth resistor, a charging capacitor, a seventh resistor and an eighth resistor. One end of the ninth resistor is respectively connected to the base of the second triode and the first end of the charging capacitor, and the other end is connected to the negative electrode of the power supply. The second end of the charging capacitor is connected to the negative electrode of the power supply through the seventh resistor, the collector and emitter of the third triode, one end of the sixth resistor is connected to the connection point of the seventh resistor and the third triode, and the other end is connected to the positive electrode of the voltage regulator tube, and is connected to one end of the eighth resistor through the emitter and collector of the second triode. The other end of the eighth resistor is connected to the base of the third triode.
8. A railway communication equipment surge protection failure detection circuit according to claim 7, characterized in that: The resistance of the ninth resistor is more than 2000 times that of the sixth resistor.
9. A railway communication equipment surge protection failure detection circuit according to claim 7, characterized in that: The second transistor is a PNP transistor, the emitter of the second transistor is connected to the sixth resistor, and the collector is connected to the eighth resistor.
10. A railway communication equipment surge protection failure detection circuit according to claim 7, characterized in that: The third transistor is an NPN transistor, the emitter of the third transistor is connected to the negative electrode of the power supply, and the collector is connected to the seventh resistor and the sixth resistor.