Bidirectional converter device lem current sensor signal line detection device

Abstract

The utility model relates to the field of circuit detection equipment, concretely relates to bidirectional converter device LEM current sensor signal line detection device, include: power module is used to provide 5V direct current power supply, including general switch, general fuse, the general switch is connected after series connection with general fuse and accesses 5V direct current power supply input end, three groups of independent detection circuit, each group corresponds to the core line of signal line, each group of circuit includes fuse, LED pilot lamp, current -limiting resistance and 50Ω load resistance, and three groups of LED pilot lamp color and core line color correspond to each other, the input of three groups of detection circuit all are connected with the output of power module electricity, and the output all are grounded. Advantageous effects lie in: the detection device of the utility model is applicable to various industrial equipment wire arrangement detection, and the versatility is strong, and can quickly position line sequence, crimping and so on, reduces the error troubleshooting time, and through the LED color and the brightness direct observation judgment line sequence, contact state, and the practicality is strong.

Description

Technical Field

[0001] This utility model relates to the field of circuit testing equipment, specifically to a device for detecting the signal line of a LEM current sensor in a bidirectional converter device. Background Technology

[0002] Rail trains primarily rely on rectifier units to convert AC 1180V to DC 1500V to provide kinetic energy. During startup, electrical energy is converted into mechanical energy, causing a drop in the contact wire voltage. At this time, the rectifier unit provides traction energy and maintains the contact wire voltage at around 1500V. During braking, the contact wire voltage rises. Since the rectifier unit lacks energy recovery capabilities, it can only dissipate excess energy through onboard resistors. Against this backdrop, the bidirectional converter was developed. The bidirectional converter not only provides traction energy during train startup but also feeds excess electrical energy back to the high-voltage power supply network during braking, achieving energy recovery and reuse. During operation, the bidirectional converter also shares the load of the rectifier unit during traction, extending the equipment's lifespan.

[0003] The power unit is the main component for executing the control algorithm. In the early stages of equipment installation and commissioning, the focus is primarily on functional testing of the power unit. Because the power unit has a closed structure, any abnormalities in internal components or errors in the installation process can affect the commissioning progress, making data acquisition from key components particularly important. The compact power unit contains two driver boards: one is a pulse distribution board for pulse calculation and processing, and the other is a large driver board for driving the IGBTs. After the unit structure upgrade, the LEM current sensor is integrated inside the unit. The pulse board acquires data and transmits it to the main board for processing via optical signals. To check whether the signal lines between this board and the sensor meet the requirements, a testing fixture needs to be fabricated to quickly locate the problem point based on the status indicator lights, avoiding damage to components due to incorrect signal line wiring.

[0004] In the existing technology, the detection of the signal line between the LEM current sensor and the pulse board in the power unit of the bidirectional converter has problems such as inconvenient operation, unintuitive fault diagnosis, and inability to quantify detection. There is an urgent need for an improved detection device to solve these problems. Utility Model Content

[0005] The purpose of this invention is to provide a signal line detection device for LEM current sensor in a bidirectional converter to solve the above-mentioned problems. The detection method is applicable to the wiring detection of various types of industrial equipment, has strong versatility, and can quickly locate problems such as wiring sequence and crimping, reducing the time for error troubleshooting. In addition, the wiring sequence and contact status can be intuitively judged by the LED color and brightness, which is highly practical. See the following description for details.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The LEM current sensor signal line detection device for bidirectional converters provided by this utility model includes:

[0008] The power module is used to provide 5V DC power, including a main switch and a main fuse. The main switch and the main fuse are connected in series to the 5V DC power input terminal.

[0009] Three independent detection circuits, each corresponding to one core wire of the signal line. Each circuit includes a fuse, LED indicator, current limiting resistor and 50Ω load resistor. The colors of the three LED indicator lights correspond to the colors of the core wires. The input terminals of the three detection circuits are electrically connected to the output terminals of the power module, and the output terminals are all grounded.

[0010] The status indicator module includes three-color LEDs: green, blue, and red.

[0011] The positive terminal of the green LED is electrically connected to the 5V output terminal of the power module, and the negative terminal is grounded to indicate the standby status.

[0012] The positive terminal of the blue LED is electrically connected to the normally open contact output terminal of the relay, and the negative terminal is grounded, which is used to indicate the test status.

[0013] The positive terminal of the red LED is electrically connected to the output terminal of the logic judgment circuit, and the negative terminal is grounded, which is used to indicate the fault status.

[0014] When using the LEM current sensor signal line detection device of the bidirectional converter device, connect the device to a 5V DC power supply, close the main switch of the power module, and observe the status indicator module. The green LED should be constantly lit, indicating that the device has entered the standby state.

[0015] Press the transient test button of the test trigger module with one hand. The test button is used to replace the traditional rocker switch. At this time, the relay is activated, the blue LED lights up, and the buzzer sounds a short beep, indicating that the test has started. The device automatically starts the RC delay circuit. After 5 seconds, the test circuit is automatically disconnected, the blue LED goes out, and the buzzer stops sounding.

[0016] If the wiring sequence and contact are normal, the red, white, and green LED indicator lights of the three sets of detection circuits will all light up normally and with uniform brightness. The buzzer will sound continuously during the test, indicating that the signal line sequence is correct and the connection is tight.

[0017] If there is poor contact in the wiring, the corresponding LED indicator light will be dimly lit and the corresponding buzzer sound will be weaker, indicating that there is a loose connection in that core wire. The subsequent check should focus on the crimping of the ribbon cable.

[0018] If the wiring sequence is incorrect, the corresponding LED will not light up, and the buzzer will sound a long beep, indicating that the wiring sequence is crossed or misaligned, and the wiring sequence needs to be checked again.

[0019] If a wiring error occurs, use a multimeter to connect to three sets of voltage test points and measure the voltage across the load resistor.

[0020] During self-test, switch the self-locking toggle switch of the self-test module to the self-test position. At this time, there is no need to connect the actual signal line. Press the test button and observe that all three sets of LEDs should light up and the buzzer should emit two short beeps, indicating that the circuit of the test device itself is normal.

[0021] Preferably, in the three independent detection circuits, the red core wire corresponds to the +15V detection circuit, the white core wire corresponds to the signal detection circuit, and the green core wire corresponds to the -15V detection circuit. The fuse of each circuit is connected in series with the power input terminal, and the current limiting resistor and the LED indicator are connected in series and then in parallel across the load resistor.

[0022] Preferably, a test trigger module is also included. The test trigger module includes a normally open transient test button, a relay, and an RC delay circuit. One end of the test button is electrically connected to the 5V output terminal of the power supply module, and the other end is electrically connected to one end of the relay coil. The other end of the relay coil is grounded. The RC delay circuit is connected in parallel with the relay coil and is used to control the relay coil to be de-energized after 5 seconds. The normally open contact of the relay is connected in series between the power supply module and the common input terminal of the three sets of detection circuits.

[0023] The RC delay circuit includes a charging and discharging loop consisting of a resistor and a capacitor connected in series. One end of the resistor is electrically connected to the power supply terminal of the relay coil, and the other end is electrically connected to one end of the capacitor. The other end of the capacitor is grounded, and it is used to control the energizing time of the relay coil to be 5 seconds.

[0024] Preferably, a buzzer prompting module is also included. This buzzer prompting module includes a transistor driving circuit and a logic judgment circuit. The base of the transistor is electrically connected to the output terminal of the test button, the emitter is grounded, the collector is electrically connected to one end of the buzzer, and the other end of the buzzer is electrically connected to the 5V output terminal of the power supply module. The input terminal of the logic judgment circuit is electrically connected to the LED indicator circuits of the three sets of detection circuits, and the output terminal is electrically connected to the control terminal of the buzzer, which is used to control the buzzer to sound according to the circuit status.

[0025] The logic judgment circuit is an AND gate circuit. The LED indicator circuits of the three sets of detection circuits are electrically connected to the 5V output terminal of the power module. The negative terminal of the LED indicator is electrically connected to the input terminal of the AND gate circuit. The output terminal of the AND gate circuit is electrically connected to the control terminal of the buzzer through a current-limiting resistor.

[0026] Preferably, a self-test module is also included. The self-test module includes a self-locking toggle switch and an isolation diode. One end of the self-locking toggle switch is electrically connected to the 5V output terminal of the power module, and the other end is electrically connected to the common input terminal of the three sets of detection circuits through the isolation diode. When the toggle switch is turned to the self-test position, the internal signal line interface is shorted to a load resistance equivalent to 50Ω of the normal line.

[0027] When the self-locking toggle switch is set to the self-test position, the internal contacts short-circuit the anode of the isolation diode to the common input terminal of the three sets of detection circuits, and electrically connect the cathode of the isolation diode to the 5V output terminal of the power supply module, simulating the normal connection state of the signal line.

[0028] Preferably, an over-temperature protection module is also included. The over-temperature protection circuit is connected in series between the main fuse of the power module and the three sets of detection circuits. When the temperature exceeds the threshold, the power supply is automatically cut off. A reverse protection diode is connected in parallel between the common input terminal of the three sets of detection circuits and ground, with the cathode facing the output terminal of the power module.

[0029] Preferably, the system also includes voltage test points, which consist of three sets of test interfaces for connecting an external multimeter to measure voltage values. These interfaces are connected in parallel across the load resistors of the three detection circuits, and the three sets of voltage test points correspond to the load resistors of the three detection circuits, respectively, for calculating the contact resistance.

[0030] The beneficial effects are:

[0031] 1. This utility model can quickly locate problems such as incorrect signal line sequence or loose crimping during the assembly of power units by adding status indicator lights to the detection fixture, thereby avoiding repeated disassembly and repair due to line faults and shortening the manual troubleshooting time.

[0032] 2. The detection method used in this application can be directly applied to the wiring detection scenarios of other industrial equipment. Through the modular circuit design of three independent detection circuits, compatibility testing of signal lines of different specifications can be achieved without the need to develop tooling separately for specific equipment.

[0033] 3. The testing fixture uses fuse protection and load resistors to simulate actual working conditions. Combined with the relative correspondence between LED indicator lights and wire core colors, it can intuitively determine whether the wire sequence is disordered and whether the contact points are firm. Specifically, when the wire sequence crosses, the corresponding LED will not light up, and when there is a loose connection, the LED brightness will decrease, thus realizing visual fault diagnosis. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a block diagram illustrating the module connection principle of this utility model;

[0036] Figure 2 This is a circuit diagram showing the connection between the power supply module, three independent detection circuits, and the status indication module of this utility model.

[0037] Figure 3 This is a detailed block diagram illustrating the component connection principle of this utility model;

[0038] Figure 4 This is the operating system flowchart of this utility model.

[0039] Attached diagram labels: 10-Power supply module, 20-Three independent detection circuits, 30-Status indicator module, 40-Test trigger module, 50-Buzzer prompt module, 60-Self-test module, 70-Over-temperature protection module. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0041] See Figures 1-3 As shown, this utility model provides a LEM current sensor signal line detection device for a bidirectional converter device, comprising:

[0042] The power module 10 is used to provide 5V DC power, including a main switch and a main fuse. The main switch and the main fuse are connected in series to the 5V DC power input terminal to control the power supply and realize overload protection.

[0043] Three independent detection circuits 20, each corresponding to one core wire of the signal line. Each circuit includes a fuse, LED indicator, current limiting resistor and 50Ω load resistor. The colors of the three LED indicator lights correspond to the colors of the core wires. The input terminals of the three detection circuits are electrically connected to the output terminals of the power module, and the output terminals are grounded. They are used to determine whether the wire sequence of the corresponding core wire is correct and whether the crimping is tight by observing the on / off state and brightness of the LED indicator lights.

[0044] Status indicator module 30 includes a tri-color LED with green, blue, and red colors, wherein:

[0045] The positive terminal of the green LED is electrically connected to the 5V output terminal of the power module, and the negative terminal is grounded to indicate the standby status.

[0046] The positive terminal of the blue LED is electrically connected to the normally open contact output terminal of the relay, and the negative terminal is grounded, which is used to indicate the test status.

[0047] The positive terminal of the red LED is electrically connected to the output terminal of the logic judgment circuit, and the negative terminal is grounded, which is used to indicate the fault status.

[0048] As an optional implementation, in the three independent detection circuits 20, the red core wire corresponds to the +15V detection circuit, the white core wire corresponds to the signal detection circuit, and the green core wire corresponds to the -15V detection circuit. The fuse of each circuit is connected in series with the power input terminal to prevent the detection circuit from overloaded. The current limiting resistor is connected in series with the LED indicator and then in parallel across the load resistor. With this setting, the load resistor simulates the actual operating current. Combined with the correspondence between the LED indicator and the core color, faults such as incorrect wiring sequence or poor contact can be intuitively judged.

[0049] It also includes a test trigger module 40, which includes a normally open transient test button, a relay, and an RC delay circuit. One end of the test button is electrically connected to the 5V output terminal of the power supply module, and the other end is electrically connected to one end of the relay coil to trigger the relay coil to be energized. The other end of the relay coil is grounded to form a circuit for the relay coil. The RC delay circuit is connected in parallel with the relay coil to control the relay coil to be de-energized after 5 seconds. The normally open contact of the relay is connected in series between the power supply module and the common input terminal of the three sets of detection circuits to control the on and off of the detection circuit.

[0050] The RC delay circuit includes a charging and discharging loop consisting of a resistor and a capacitor connected in series. One end of the resistor is electrically connected to the power supply terminal of the relay coil, and the other end is electrically connected to one end of the capacitor. The other end of the capacitor is grounded. This circuit is used to control the energizing time of the relay coil to 5 seconds. This setting can prevent the detection circuit from overheating due to prolonged energizing.

[0051] It also includes a buzzer prompt module 50, which includes a transistor driving circuit and a logic judgment circuit for providing sound feedback on the line status. The base of the transistor is electrically connected to the output terminal of the test button, the emitter is grounded, the collector is electrically connected to one end of the buzzer, and the other end of the buzzer is electrically connected to the 5V output terminal of the power module. It is used to drive the buzzer to sound when the test button is pressed. The input terminal of the logic judgment circuit is electrically connected to the LED indicator circuits of the three sets of detection circuits, and the output terminal is electrically connected to the control terminal of the buzzer for controlling the buzzer to sound according to the line status.

[0052] The logic judgment circuit is an AND gate circuit. The LED indicator circuits of the three sets of detection circuits are electrically connected to the 5V output terminal of the power module. The negative terminal of the LED indicator is electrically connected to the input terminal of the AND gate circuit, which is used to determine whether the three sets of detection circuits are working normally. The output terminal of the AND gate circuit is electrically connected to the control terminal of the buzzer through a current limiting resistor. With this setting, when all three sets of circuits are normal, the buzzer will emit a short beep, and when any one set is abnormal, it will emit a long beep, realizing the sound warning of the fault.

[0053] It also includes a self-test module 60, which includes a self-locking toggle switch and an isolation diode. One end of the toggle switch is electrically connected to the 5V output terminal of the power module, and the other end is electrically connected to the common input terminal of the three sets of detection circuits through the isolation diode. This is used to simulate the normal connection state of the signal line to verify the reliability of the device itself. When the self-locking toggle switch is turned to the self-test position, the internal signal line interface is shorted to a load resistance equivalent to a normal line of 50Ω to generate a self-test signal.

[0054] When the self-locking toggle switch is turned to the self-test position, the internal contacts short-circuit the anode of the isolation diode to the common input terminal of the three sets of detection circuits, and electrically connect the cathode of the isolation diode to the 5V output terminal of the power module, simulating the normal connection state of the signal line. This setting makes it easy to quickly verify the circuit integrity of the detection device without connecting the actual signal line.

[0055] It also includes an over-temperature protection module 70, which is connected in series between the main fuse of the power module and the three sets of detection circuits. When the temperature exceeds the threshold, it automatically cuts off the power supply to prevent the device from overheating and damaging the components. A reverse connection protection diode is connected in parallel between the common input terminal of the three sets of detection circuits and ground, with the cathode facing the output terminal of the power module to prevent current backflow from damaging the circuit when the signal line is reversed.

[0056] It also includes voltage test points, which include three test interfaces for connecting an external multimeter to measure voltage values. These interfaces are connected in parallel across the load resistors of the three detection circuits. The three voltage test points correspond to the load resistors of the three detection circuits, and are used to calculate the contact resistance by measuring the voltage across the load resistors, thereby achieving quantitative detection.

[0057] When using the LEM current sensor signal line detection device of the bidirectional converter device, connect the device to a 5V DC power supply, close the main switch of the power module, and observe the status indicator module. The green LED should be constantly lit, indicating that the device has entered the standby state.

[0058] Press the transient test button of the test trigger module with one hand. The test button is used to replace the traditional rocker switch. At this time, the relay is activated, the blue LED lights up, and the buzzer sounds a short beep, indicating that the test has started. The device automatically starts the RC delay circuit. After 5 seconds, the test circuit is automatically disconnected, the blue LED goes out, and the buzzer stops sounding.

[0059] If the wiring sequence and contact are normal, the red, white, and green LED indicator lights of the three sets of detection circuits will all light up normally and with uniform brightness. The buzzer will sound continuously during the test, indicating that the signal line sequence is correct and the connection is tight.

[0060] If there is poor contact in the wiring, the corresponding LED indicator light will be dimly lit and the corresponding buzzer sound will be weaker, indicating that there is a loose connection in that core wire. The subsequent check should focus on the crimping of the ribbon cable.

[0061] If the wiring sequence is incorrect, the corresponding LED will not light up, and the buzzer will sound a long beep, indicating that the wiring sequence is crossed or misaligned, and the wiring sequence needs to be checked again.

[0062] If a wiring error occurs, use a multimeter to connect to three sets of voltage test points and measure the voltage across the load resistor.

[0063] During self-test, switch the self-locking toggle switch of the self-test module to the self-test position. At this time, there is no need to connect the actual signal line. Press the test button and observe that all three sets of LEDs should light up and the buzzer should emit two short beeps, indicating that the circuit of the test device itself is normal.

[0064] This invention, by adding status indicator lights to the detection fixture, can quickly locate problems such as incorrect signal wire sequence or loose crimping during the assembly of power units, avoiding repeated disassembly and repair due to line faults and shortening manual troubleshooting time.

[0065] The detection method used in this application can be directly applied to the wiring detection scenarios of other industrial equipment. Through the modular circuit design of three independent detection circuits, it can achieve compatibility testing of signal lines of different specifications without the need to develop tooling separately for specific equipment.

[0066] The testing fixture uses fuse protection and load resistors to simulate actual working conditions. Combined with the relative correspondence between LED indicator lights and wire core colors, it can intuitively determine whether the wire sequence is disordered and whether the contact points are firm. Specifically, when the wire sequence crosses, the corresponding LED will not light up, and when there is a loose connection, the LED brightness will decrease, thus realizing visual fault diagnosis.

[0067] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A signal line detection device for LEM current sensor in a bidirectional converter, characterized in that, include: The power module is used to provide 5V DC power, including a main switch and a main fuse. The main switch and the main fuse are connected in series to the 5V DC power input terminal. Three independent detection circuits, each corresponding to one core wire of the signal line. Each circuit includes a fuse, LED indicator, current limiting resistor and 50Ω load resistor. The colors of the three LED indicator lights correspond to the colors of the core wires. The input terminals of the three detection circuits are electrically connected to the output terminals of the power module, and the output terminals are all grounded. The status indicator module includes three-color LEDs: green, blue, and red. The positive terminal of the green LED is electrically connected to the 5V output terminal of the power module, and the negative terminal is grounded to indicate the standby status. The positive terminal of the blue LED is electrically connected to the normally open contact output terminal of the relay, and the negative terminal is grounded, which is used to indicate the test status. The positive terminal of the red LED is electrically connected to the output terminal of the logic judgment circuit, and the negative terminal is grounded, which is used to indicate the fault status.

2. The LEM current sensor signal line detection device for bidirectional converter according to claim 1, characterized in that, In the three independent detection circuits, the red core wire corresponds to the +15V detection circuit, the white core wire corresponds to the signal detection circuit, and the green core wire corresponds to the -15V detection circuit. The fuse of each circuit is connected in series with the power input terminal, and the current limiting resistor and the LED indicator are connected in series and then in parallel across the load resistor.

3. The LEM current sensor signal line detection device for bidirectional converter according to claim 1, characterized in that, It also includes a test trigger module, which includes a normally open transient test button, a relay, and an RC delay circuit. One end of the test button is electrically connected to the 5V output terminal of the power supply module, and the other end is electrically connected to one end of the relay coil. The other end of the relay coil is grounded. The RC delay circuit is connected in parallel with the relay coil and is used to control the relay coil to be de-energized after 5 seconds. The normally open contact of the relay is connected in series between the power supply module and the common input terminal of the three sets of detection circuits. The RC delay circuit includes a charging and discharging loop consisting of a resistor and a capacitor connected in series. One end of the resistor is electrically connected to the power supply terminal of the relay coil, and the other end is electrically connected to one end of the capacitor. The other end of the capacitor is grounded, and it is used to control the energizing time of the relay coil to be 5 seconds.

4. The LEM current sensor signal line detection device for bidirectional converter according to claim 1, characterized in that, It also includes a buzzer prompting module, which includes a transistor driving circuit and a logic judgment circuit. The base of the transistor is electrically connected to the output terminal of the test button, the emitter is grounded, the collector is electrically connected to one end of the buzzer, and the other end of the buzzer is electrically connected to the 5V output terminal of the power module. The input terminal of the logic judgment circuit is electrically connected to the LED indicator circuits of the three sets of detection circuits, and the output terminal is electrically connected to the control terminal of the buzzer, which is used to control the buzzer to sound according to the circuit status. The logic judgment circuit is an AND gate circuit. The LED indicator circuits of the three sets of detection circuits are electrically connected to the 5V output terminal of the power module. The negative terminal of the LED indicator is electrically connected to the input terminal of the AND gate circuit. The output terminal of the AND gate circuit is electrically connected to the control terminal of the buzzer through a current-limiting resistor.

5. The LEM current sensor signal line detection device for bidirectional converter according to claim 1, characterized in that, It also includes a self-test module, which includes a self-locking toggle switch and an isolation diode. One end of the self-locking toggle switch is electrically connected to the 5V output terminal of the power module, and the other end is electrically connected to the common input terminal of the three sets of detection circuits through the isolation diode. When the toggle switch is turned to the self-test position, the internal signal line interface is shorted to a load resistance equivalent to 50Ω of the normal line. When the self-locking toggle switch is set to the self-test position, the internal contacts short-circuit the anode of the isolation diode to the common input terminal of the three sets of detection circuits, and electrically connect the cathode of the isolation diode to the 5V output terminal of the power supply module, simulating the normal connection state of the signal line.

6. The LEM current sensor signal line detection device for bidirectional converter according to claim 5, characterized in that, It also includes an over-temperature protection module, which is connected in series between the main fuse of the power module and the three sets of detection circuits. When the temperature exceeds the threshold, the power supply is automatically cut off. A reverse protection diode is connected in parallel between the common input terminal of the three sets of detection circuits and ground, with the cathode facing the output terminal of the power module.

7. The LEM current sensor signal line detection device for bidirectional converter according to claim 1, characterized in that, It also includes voltage test points, which include three sets of test interfaces for connecting an external multimeter to measure voltage values. These interfaces are connected in parallel across the load resistors of the three sets of detection circuits. The three sets of voltage test points correspond to the load resistors of the three sets of detection circuits, and are used to calculate the contact resistance.

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