A boost chopper port voltage detection circuit and system

Abstract

The invention discloses a boost chopper port voltage detection circuit and system, comprising: an impulse current generator and a monitoring device, wherein the output end of the impulse current generator is connected to one end of a shell of the boost chopper, the first detection end of the monitoring device is connected to the port of the boost chopper, the second detection end is connected to the impulse current generator, and the other end of the shell of the boost chopper is grounded, wherein: the impulse current generator is used to inject an impulse current into the shell of the boost chopper; the monitoring device is used to collect the output current of the impulse current generator and the port voltage of the boost chopper; during use, the invention can obtain multiple groups of output currents and corresponding port voltages by changing the size of the injected impulse current, so as to evaluate the induced voltage generated by the port of the boost chopper, and provide a basis for the optimal design of the power supply.

Description

Technical Field

[0001] The invention relates to the technical field of maglev trains, and in particular to a boost chopper port voltage detection circuit and system. Background Art

[0002] When the maglev train is running at high speed, it has no contact with the wheels and rails, and there is no protective shielding measures above the train like the EMU, and the grounding structure is also very different from that of ordinary wheel-rail trains. Therefore, when the maglev train runs along the elevated line, it is vulnerable to direct lightning strikes.

[0003] Additional effects may occur when the current from a direct lightning strike flows on a conductor, causing the structural resistive voltage to rise, and when the rapidly changing electromagnetic field couples the voltage and current transiently to the equipment. That is, the transient strong electromagnetic field generated by lightning and the lightning current generated on the conductor are induced through the interconnection line, resulting in high voltage and large current at the interface of the equipment, causing equipment damage or system dysfunction.

[0004] When the large current generated by the indirect effect of lightning passes through the boost chopper casing, an induced voltage is generated at the boost chopper port. Currently, it is impossible to evaluate the induced voltage generated at the boost chopper port in this case, making it difficult to provide a basis for the optimal design of the power supply.

[0005] In view of this, how to provide a circuit and system capable of realizing voltage detection at the port of a boost chopper becomes a problem that needs to be solved by those skilled in the art. Summary of the invention

[0006] The purpose of the embodiments of the present invention is to provide a boost chopper port voltage detection circuit and system, which are helpful for evaluating the induced voltage generated by the boost chopper port during use, and provide a basis for the optimal design of the power supply.

[0007] In order to solve the above technical problems, an embodiment of the present invention provides a boost chopper port voltage detection circuit, comprising: an impulse current generator and a monitoring device, wherein the output end of the impulse current generator is connected to one end of a housing of the boost chopper, the first detection end of the monitoring device is connected to the port of the boost chopper, the second detection end is connected to the impulse current generator, and the other end of the housing of the boost chopper is grounded, wherein:

[0008] The impulse current generator is used to inject an impulse current into the housing of the boost chopper;

[0009] The monitoring device is used to collect the output current of the impulse current generator and the port voltage of the boost chopper.

[0010] Optionally, the impulse current generator includes a voltage regulating device, a first current limiting resistor, a transformer, a second current limiting resistor, a voltage divider, a capacitor, a ball gap switch, a third current limiting resistor, an inductor and a discharge resistor, wherein:

[0011] The input end of the voltage regulating device is connected to the power grid, the first output end of the voltage regulating device is connected to the first input end of the transformer through the first current limiting resistor, the second output end of the voltage regulating device is connected to the second input end of the transformer, the first output end of the transformer is connected to the first end of the capacitor and the first end of the voltage divider through the second current limiting resistor, the second output end of the transformer is connected to the second end of the capacitor and the second end of the voltage divider, and the capacitor, the ball gap switch, the third current limiting resistor, the inductor and the discharge resistor are connected in series.

[0012] Optionally, the impulse current generator also includes a rectifier bridge, the first output end of the transformer is connected to the first input end of the rectifier bridge, the second output end of the transformer is connected to the second input end of the rectifier bridge, the first output end of the rectifier bridge is connected to the first end of the capacitor and the first end of the voltage divider through the second current limiting resistor, and the second output end of the rectifier bridge is connected to the second end of the capacitor and the second end of the voltage divider.

[0013] Optionally, the impulse current generator further includes a discharge electromagnet, and the capacitor is connected in parallel with the discharge electromagnet and then connected in series with the ball gap switch, the third current limiting resistor, the inductor and the discharge resistor.

[0014] Optionally, the impulse current generator further includes a grid circuit breaker, and the voltage regulating device is connected to the grid via the grid circuit breaker.

[0015] Optionally, the monitoring equipment includes an oscilloscope, a differential voltage probe and a flexible current probe; wherein,

[0016] The first channel of the oscilloscope monitors the output current of the impulse current generator through the flexible current probe; the second channel of the oscilloscope monitors the port voltage of the boost chopper through the differential voltage probe.

[0017] Optionally, the other end of the casing of the boost chopper is grounded through a grounding busbar.

[0018] Optionally, the charging polarity of the capacitor is positive.

[0019] Optionally, the maximum charging voltage of the capacitor is 100KV.

[0020] An embodiment of the present invention further provides a boost chopper port voltage detection system, such as the boost chopper port voltage detection circuit described above.

[0021] The embodiment of the present invention provides a boost chopper port voltage detection circuit and system, including: an impulse current generator and a monitoring device, wherein the output end of the impulse current generator is connected to one end of a shell of the boost chopper, the first detection end of the monitoring device is connected to the port of the boost chopper, the second detection end is connected to the impulse current generator, and the other end of the shell of the boost chopper is grounded, wherein: the impulse current generator is used to inject an impulse current into the shell of the boost chopper; the monitoring device is used to collect the output current of the impulse current generator and the port voltage of the boost chopper.

[0022] It can be seen that in the embodiment of the present invention, the impulse current is injected into one end of the housing of the boost chopper through the impulse current generator, and the port of the boost chopper will couple out an induced voltage. The output current of the impulse current generator and the port voltage of the boost chopper can be collected through the monitoring equipment. By changing the size of the injected impulse current, multiple groups of output currents and corresponding port voltages can be obtained to evaluate the induced voltage generated by the port of the boost chopper, providing a basis for the optimal design of the power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of the structure of a boost chopper port voltage detection circuit provided by an embodiment of the present invention;

[0025] Figure 2 A circuit diagram of a boost chopper port voltage detection circuit provided by an embodiment of the present invention;

[0026] Figure 3 A circuit diagram of another boost chopper port voltage detection circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The embodiment of the present invention provides a boost chopper port voltage detection circuit and system, which are helpful for evaluating the induced voltage generated by the boost chopper port during use, and provide a basis for the optimized design of the power supply.

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Please refer to Figure 1 , Figure 1 A schematic diagram of a boost chopper port voltage detection circuit provided by an embodiment of the present invention. The boost chopper port voltage detection circuit comprises: an impulse current generator 1 and a monitoring device 2, wherein the output end of the impulse current generator 1 is connected to one end of a housing of the boost chopper, the first detection end of the monitoring device 2 is connected to a port of the boost chopper, the second detection end is connected to the impulse current generator 1, and the other end of the housing of the boost chopper is grounded, wherein:

[0030] An impulse current generator 1, used for injecting an impulse current into a housing of the step-up chopper;

[0031] Monitoring device 2 is used to collect the output current of the impulse current generator and the port voltage of the boost chopper.

[0032] Specifically, in practical applications, multiple groups of lightning signals can be obtained in advance according to the lightning conditions in the actual operating environment of the maglev train, and the size of the corresponding impact current can be determined according to the lightning signals. In the embodiment of the present invention, an impact current generator 1 can be used to inject an impact current into the housing of the boost chopper, and the size of the impact current can be predetermined according to the above method. After the impact current is injected into the housing of the boost chopper, a corresponding induced voltage will be induced at the port of the boost chopper. In the embodiment of the present invention, the induced voltage at the port of the boost chopper is monitored and collected by the monitoring device 2 to obtain the port voltage of the boost chopper, and the output current of the impact current generator 1 is collected at the same time to obtain the output current and the port voltage. Among them, the other end of the housing of the boost chopper is grounded through the grounding busbar.

[0033] In practical applications, multiple impact currents can be determined according to actual conditions, and the size of the impact current can be changed to obtain multiple sets of output current and port voltage data, so that the staff can evaluate the induced voltage generated by the boost chopper port based on these data, and further optimize the power supply design based on the evaluation results, which is beneficial to improving the safety of maglev trains.

[0034] Further, such as Figure 2As shown, the impulse current generator 1 in the embodiment of the present invention includes a voltage regulating device 110, a first current limiting resistor 111, a transformer 112, a second current limiting resistor 113, a voltage divider 114, a capacitor 115, a ball gap switch 116, a third current limiting resistor 117, an inductor 118 and a discharge resistor 119, wherein:

[0035] The input end of the voltage regulating device 110 is connected to the power grid, the first output end of the voltage regulating device 110 is connected to the first input end of the transformer 112 through the first current limiting resistor 111, the second output end of the voltage regulating device 110 is connected to the second input end of the transformer 112, the first output end of the transformer 112 is connected to the first end of the capacitor 115 and the first end of the voltage divider 114 through the second current limiting resistor 113, the second output end of the transformer 112 is connected to the second end of the capacitor 115 and the second end of the voltage divider 114, and the capacitor 115, the ball gap switch 116, the third current limiting resistor 117, the inductor 118 and the discharge resistor 119 are connected in series.

[0036] Specifically, the voltage regulating device 110 can control the transformer 112 and charge the capacitor 115 through the first current limiting resistor 111, and can monitor the charge amount of the capacitor 115 through the voltage divider 114 connected in parallel with the capacitor 115. The capacitor 115 is connected in series with the ball gap switch 116, the third current limiting resistor 117, the inductor 118 and the discharge resistor 119. When the capacitor 115 is discharged, the third current limiting resistor 117 and the inductor 118 are used to output the lightning waveform, and the capacitor 115 and the discharge resistor 119 are used to discharge and inject an impact current into the boost chopper through the ball gap switch 116.

[0037] Further, such as Figure 3 As shown, in order to make the discharge of the impulse current generator 1 more directional, the impulse current generator 1 in the embodiment of the present invention may also include a rectifier bridge 120, the first output end of the transformer 112 is connected to the first input end of the rectifier bridge 120, the second output end of the transformer 112 is connected to the second input end of the rectifier bridge 120, the first output end of the rectifier bridge 120 is connected to the first end of the capacitor 115 and the first end of the voltage divider 114 through the second current limiting resistor 113, and the second output end of the rectifier bridge 120 is connected to the second end of the capacitor 115 and the second end of the voltage divider 114.

[0038] Specifically, the output current of the transformer 112 is rectified by the rectifier bridge to charge the capacitor 115 . The rectifier bridge can rectify the negative current into a positive current, thereby making the direction of the capacitor 115 more directional.

[0039] The rated input voltage of the rectifier bridge 120 may be AC220V, the rated output voltage may be DC100KV, and the rated power may be 15KVA. AC stands for Alternating Current, and DC stands for Direct Current.

[0040] Furthermore, in order to make the discharge capability of the impulse current generator 1 stronger, the impulse current generator 1 in the embodiment of the present invention may further include a discharge electromagnet 121, and the capacitor 115 is connected in parallel with the discharge electromagnet 121 and then connected in series with the ball gap switch 116, the third current limiting resistor 117, the inductor 118 and the discharge resistor 119. Specifically, in practical applications, the discharge electromagnet 121 may be a rotating electromagnet, which has the characteristics of ±24V power supply and bidirectional operation.

[0041] In practical applications, the voltage regulating device 110 in the impulse current generator 1 can be connected to the power grid through the power grid circuit breaker 122 to flexibly control whether to access the power grid, and in order to further improve circuit safety, the voltage regulating device 110 can be connected to the first current limiting resistor through the fuse 123 and the circuit breaker 124.

[0042] It should be noted that the impulse current generator 1 in the embodiment of the present invention can be used to generate impulse currents of several thousand amperes to several tens of kiloamperes, and the specifications of the generated impulse currents are, for example: 6.4 / 69us, 20KA; 11 / 30us, 40KA; 9.9 / 37us, 50KA; of course, other specifications of impulse currents can also be generated, which can be determined according to actual conditions. The specifications of the capacitor 115 in the embodiment of the present invention can be 100KV, 2.25uF, which can be realized by connecting two capacitors in parallel. The lightning current waveform output by the capacitor 115 can be 6.4 / 69us, 11 / 30us or 9.9 / 37us, and the corresponding output peak can be 20KA, 40KA or 50KA; the charging voltage of the capacitor 115 can be 100KV. The adjustment range of the inductor 118 can be 0-10uH, the withstand voltage is 100KV, and the maximum current can be 50KA. The capacity of the rectifier bridge 120 can be 15KVA (calculated based on a charging time of 5s), the rectifier bridge 120 is full-wave rectifier, the silicon stack is 300KV / 0.2A, the maximum charging voltage of the capacitor 115 is 100KV, the charging polarity of the capacitor 115 is positive, the third current limiting resistor 117 is 20KOhm built-in, the voltage divider 114 is external, and the ratio sampling is performed. The adjustment accuracy of the ball gap switch can be 0.1mm, the gap adjustment range can be 0-45mm, the withstand voltage test range is 1-120KV, the ball diameter is Φ100, and the maximum remote control distance is 1KM (open space).

[0043] Furthermore, the monitoring device 2 in the embodiment of the present invention includes an oscilloscope 21, a differential voltage probe 22 and a flexible current probe 23; wherein,

[0044] The first channel of the oscilloscope 21 monitors the output current of the impulse current generator 1 through a flexible current probe 23 ; the second channel of the oscilloscope 21 monitors the port voltage of the boost chopper through a differential voltage probe 22 .

[0045] It can be seen that in the embodiment of the present invention, the impulse current is injected into one end of the housing of the boost chopper through the impulse current generator, and the port of the boost chopper will couple out an induced voltage. The output current of the impulse current generator and the port voltage of the boost chopper can be collected through the monitoring equipment. By changing the size of the injected impulse current, multiple groups of output currents and corresponding port voltages can be obtained to evaluate the induced voltage generated by the port of the boost chopper, providing a basis for the optimal design of the power supply.

[0046] On the basis of the above-mentioned embodiment, the embodiment of the present invention further provides a boost chopper port voltage detection system, such as the above-mentioned boost chopper port voltage detection circuit.

[0047] It should be noted that the improved boost chopper port voltage detection system in the embodiment of the present invention has the same beneficial effects as the boost chopper port voltage detection circuit provided in the above embodiment, and for the specific introduction of the boost chopper port voltage detection circuit involved in the embodiment of the present invention, please refer to the above embodiment, and the present invention will not be repeated here.

[0048] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0049] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0050] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A boost chopper port voltage detection circuit, characterized in that: include: An impulse current generator and a monitoring device, wherein the output end of the impulse current generator is connected to one end of the housing of a boost chopper, the first detection end of the monitoring device is connected to the port of the boost chopper, the second detection end is connected to the impulse current generator, and the other end of the housing of the boost chopper is grounded, wherein: The impulse current generator is used to inject an impulse current into the housing of the boost chopper; The monitoring device is used to collect the output current of the impulse current generator and the port voltage of the boost chopper.

2. The boost chopper port voltage detection circuit according to claim 1, characterized in that: The impulse current generator includes a voltage regulating device, a first current limiting resistor, a transformer, a second current limiting resistor, a voltage divider, a capacitor, a ball gap switch, a third current limiting resistor, an inductor and a discharge resistor, wherein: The input end of the voltage regulating device is connected to the power grid, the first output end of the voltage regulating device is connected to the first input end of the transformer through the first current limiting resistor, the second output end of the voltage regulating device is connected to the second input end of the transformer, the first output end of the transformer is connected to the first end of the capacitor and the first end of the voltage divider through the second current limiting resistor, the second output end of the transformer is connected to the second end of the capacitor and the second end of the voltage divider, and the capacitor, the ball gap switch, the third current limiting resistor, the inductor and the discharge resistor are connected in series.

3. The boost chopper port voltage detection circuit according to claim 2, characterized in that: The impulse current generator also includes a rectifier bridge, the first output end of the transformer is connected to the first input end of the rectifier bridge, the second output end of the transformer is connected to the second input end of the rectifier bridge, the first output end of the rectifier bridge is connected to the first end of the capacitor and the first end of the voltage divider through the second current limiting resistor, and the second output end of the rectifier bridge is connected to the second end of the capacitor and the second end of the voltage divider.

4. The boost chopper port voltage detection circuit according to claim 2, characterized in that: The impulse current generator also includes a discharge electromagnet. The capacitor is connected in parallel with the discharge electromagnet and then connected in series with the ball gap switch, the third current limiting resistor, the inductor and the discharge resistor.

5. The boost chopper port voltage detection circuit according to claim 2, characterized in that: The impulse current generator also includes a power grid circuit breaker, and the voltage regulating device is connected to the power grid through the power grid circuit breaker.

6. The boost chopper port voltage detection circuit according to any one of claims 2 to 5, characterized in that: The monitoring equipment includes an oscilloscope, a differential voltage probe and a flexible current probe; wherein, The first channel of the oscilloscope monitors the output current of the impulse current generator through the flexible current probe; the second channel of the oscilloscope monitors the port voltage of the boost chopper through the differential voltage probe.

7. The boost chopper port voltage detection circuit according to claim 6, characterized in that: The other end of the housing of the step-up chopper is grounded through a grounding busbar.

8. The boost chopper port voltage detection circuit according to claim 6, characterized in that: The charging polarity of the capacitor is positive.

9. The boost chopper port voltage detection circuit according to claim 6, characterized in that: The maximum charging voltage of the capacitor is 100KV.

10. A boost chopper port voltage detection system, characterized in that: A boost chopper port voltage detection circuit according to any one of claims 1 to 9.

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