Railway signal power supply equipment testing device

Abstract

A railway signal power supply equipment testing device comprises a body, a DL37 connector and a switching circuit. The control end of the switching circuit is connected with one end of a first resistor, the other end of the first resistor is connected with one end of a second resistor and a base electrode of a triode, and the second resistor and an emitting electrode of the triode are grounded. The collector of the triode is connected with one end of the third resistor, the anode of the first diode and the control input end of the double-pole double-throw relay, the other end of the third resistor is connected with the cathode of the second diode, and the anode of the second diode, the cathode of the first diode and the output end of the double-pole double-throw relay are jointly connected with a first power supply; the first moving contact is connected with an alternating current live wire, the second moving contact is connected with an alternating current zero line, the first normally closed static contact and the second normally open static contact are connected with a terminal 2 of the DL37 connector, and the second normally closed static contact and the first normally open static contact are connected with a terminal 7 of the DL37 connector. Therefore, the problem of switching compatibility of the wiring terminal 2 and the wiring terminal 7 can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of railway signal power supply detection, in particular to a railway signal power supply equipment testing device. Background Art

[0002] As the power supply equipment for railway signal equipment, the railway signal power supply system plays a vital role in the reliability and safety of railway signal operation, and various types of power supply equipment are key components of the power supply system. As the power supply equipment ages, it will cause failures, and frequent on-site testing is required.

[0003] Railway signal power supply is mainly divided into high-frequency DC power supply and high-frequency AC power supply. The high-frequency AC power supply is divided into single-phase 50Hz and 25Hz. The 50Hz output is 220Vac, and the 25Hz output is 2-way, one track power supply is 220Vac, and the other local power supply is 110Vac. The DC high-frequency power supply is divided into 24V, 48V and 220V output. The input and output terminals of each power supply device use a unified DL37 connector (as specified by the railway standard).

[0004] Among them, the terminal of DL37 connector is as follows Figure 3 As shown, the definitions of each terminal are as follows Figure 4 As shown. Figure 2 It can be seen that the interface definition of terminal 2 and terminal 7 in the 25Hz AC power supply is completely incompatible with the interface definition (neutral and live wire definition) of the other power supplies of the terminal. If the 25Hz power supply is tested with the terminal for testing other power supplies, once powered on, the AC input will be short-circuited, which will not only damage the power supply but also pose a threat to the tester. At present, a set of test tools is required for each power supply type, or manual switching is required, which makes the on-site testing equipment numerous and the debugging difficulty increased. Utility Model Content

[0005] The utility model aims to provide a railway signal power supply equipment testing device, which can automatically switch between terminal 2 and terminal 7 when testing 25Hz power supply, and does not switch in other cases, thereby solving the problem of input AC terminal compatibility.

[0006] In order to achieve the above purpose, this utility provides the following technical solutions:

[0007] A railway signal power supply equipment testing device, the device comprising a body, a DL37 connector and a switching circuit; the body is electrically connected to the DL37 connector, the DL37 connector comprises a terminal 2 and a terminal 7;

[0008] The switching circuit includes a control terminal and a double-pole double-throw relay, wherein the double-pole double-throw relay includes a control input terminal, a control output terminal, a first moving contact, a second moving contact, a first normally closed static contact, a second normally closed static contact, a first normally open static contact, and a second normally open static contact;

[0009] The control end is connected to one end of the first resistor, the other end of the first resistor is respectively connected to one end of the second resistor and the base of the transistor, the second resistor and the emitter of the transistor are grounded, the collector of the transistor is respectively connected to one end of the third resistor, the positive electrode of the first diode and the control input end of the double-pole double-throw relay, the other end of the third resistor is connected to the negative electrode of the second diode, and the positive electrode of the second diode, the negative electrode of the first diode and the output end of the double-pole double-throw relay are commonly connected to the first power supply;

[0010] Among them, the first moving contact is used to connect the AC live wire, the second moving contact is used to connect the AC neutral wire, the first normally closed static contact and the second normally open static contact are connected to the terminal 2, and the second normally closed static contact and the first normally open static contact are connected to the terminal 7.

[0011] Preferably, the control end is connected to a controller, and the controller is configured to provide a high level when the device tests a 25Hz AC power supply, and to provide a low level when the device tests a 50Hz AC power supply, a 24V DC power supply, a 48V DC power supply, and a 220V DC power supply.

[0012] Preferably, the high level is 5V, and the low level is 0V.

[0013] Preferably, the first power supply is +24V.

[0014] Preferably, the transistor is an NPN transistor.

[0015] Preferably, the second diode is a light emitting diode.

[0016] The advantages of the utility model are:

[0017] The utility model provides a railway signal power supply equipment testing device,

[0018] The railway signal power supply equipment test device provided by the utility model can automatically switch between terminal 2 and terminal 7 when testing a 25Hz power supply, and does not switch in other cases, thereby solving the problem of input AC terminal compatibility. Accordingly, the utility model only needs one set of test tooling to achieve the measurement of various power supply equipment, and does not require a variety of measuring equipment on site, reducing the workload of debugging personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a principle block diagram of a railway signal power supply equipment testing device of the utility model;

[0020] Figure 2 This is a principle structure diagram of a switching circuit of the utility model;

[0021] Figure 3 It is a schematic diagram of the structure of the connection terminal of the DL37 connector in the prior art;

[0022] Figure 4 This is a terminal function definition table of the DL37 connector in the prior art. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0024] See attached Figure 1 The present embodiment provides a railway signal power supply equipment test device including a body, a DL37 connector and a switching circuit. The body is an inherent device for measuring the power supply equipment and can be set in a conventional manner. The body is electrically connected to the DL37 connector, and the body provides an interface for connecting to the outside world through the DL37 connector. The DL37 connector includes a terminal 2 and a terminal 7.

[0025] See attached Figure 2 The switching circuit includes a control end and a double-pole double-throw relay K1. The double-pole double-throw relay K1 includes a control input end, a control output end, a first moving contact, a second moving contact, a first normally closed static contact, a second normally closed static contact, a first normally open static contact and a second normally open static contact.

[0026] The control end is connected to one end of the first resistor R1, the other end of the first resistor R1 is respectively connected to one end of the second resistor R2 and the base of the transistor Q1, the second resistor R2 and the emitter of the transistor Q1 are grounded, the collector of the transistor Q1 is respectively connected to one end of the third resistor R3, the positive electrode of the first diode D1 and the control input end of the double-pole double-throw relay K1, the other end of the third resistor R3 is connected to the negative electrode of the second diode D2, the positive electrode of the second diode D2, the negative electrode of the first diode D1 and the output end of the double-pole double-throw relay K1 are commonly connected to the first power supply; in this embodiment, the first power supply is +24V. The transistor is an NPN transistor. The second diode is a light-emitting diode.

[0027] Among them, the first moving contact is used to connect the AC live wire INL, the second moving contact is used to connect the AC neutral wire INN, the first normally closed static contact and the second normally open static contact are connected to terminal 2, and the second normally closed static contact and the first normally open static contact are connected to terminal 7.

[0028] The control end is connected to a controller, and the controller is configured to provide a high level of 5V when the device tests a 25Hz AC power supply. When the device tests a 50Hz AC power supply, a 24V DC power supply, a 48V DC power supply, and a 220V DC power supply, a low level of 0V is provided. The controller can be configured by software. When the device selects a 25Hz AC power supply measurement, a 5V high level output will be output at the communication (I / O) port (while other models of power supplies are selected, a 0V low level is output). By using this characteristic, we introduce this signal as a control signal. When a 25Hz power supply is selected, the line switching of the terminal 2 and the terminal 7 is performed through a double-pole double-throw relay, and in other cases, no switching is performed, thereby solving the problem of compatibility of the two terminals (2, 7). In this way, the utility model only needs one set of test tooling to realize the measurement of a variety of power supply equipment, and no numerous measuring equipment is required on site, which reduces the workload of the debugging personnel.

[0029] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, so that an article or device / device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to these articles or devices / devices. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0030] The above are the preferred embodiments of the utility model and the technical principles used therein. For those skilled in the art, without departing from the spirit and scope of the utility model, any obvious changes such as equivalent transformation, simple replacement, etc. based on the technical solution of the utility model shall fall within the protection scope of the utility model.

Claims

1. A railway signal power supply equipment testing device, characterized in that: The device comprises a body, a DL37 connector and a switching circuit; the body is electrically connected to the DL37 connector, and the DL37 connector comprises a terminal 2 and a terminal 7; The switching circuit includes a control terminal and a double-pole double-throw relay, wherein the double-pole double-throw relay includes a control input terminal, a control output terminal, a first moving contact, a second moving contact, a first normally closed static contact, a second normally closed static contact, a first normally open static contact, and a second normally open static contact; The control end is connected to one end of the first resistor, the other end of the first resistor is respectively connected to one end of the second resistor and the base of the transistor, the second resistor and the emitter of the transistor are grounded, the collector of the transistor is respectively connected to one end of the third resistor, the positive electrode of the first diode and the control input end of the double-pole double-throw relay, the other end of the third resistor is connected to the negative electrode of the second diode, and the positive electrode of the second diode, the negative electrode of the first diode and the output end of the double-pole double-throw relay are commonly connected to the first power supply; Among them, the first moving contact is used to connect the AC live wire, the second moving contact is used to connect the AC neutral wire, the first normally closed static contact and the second normally open static contact are connected to the terminal 2, and the second normally closed static contact and the first normally open static contact are connected to the terminal 7.

2. The railway signal power supply equipment testing device according to claim 1, characterized in that: The control end is connected to a controller, and the controller is configured to provide a high level when the device tests a 25Hz AC power supply, and to provide a low level when the device tests a 50Hz AC power supply, a 24V DC power supply, a 48V DC power supply, and a 220V DC power supply.

3. The railway signal power supply equipment testing device according to claim 2, characterized in that: The high level is 5V, and the low level is 0V.

4. The railway signal power supply equipment testing device according to claim 1, characterized in that: The first power supply is +24V.

5. The railway signal power supply equipment testing device according to claim 1, characterized in that: The transistor is an NPN transistor.

6. The railway signal power supply equipment testing device according to claim 1, characterized in that: The second diode is a light emitting diode.

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