Controllable overvoltage absorber based on traction system

Abstract

To provide a controllable overvoltage absorption device based on a traction system.SOLUTION: An overvoltage absorption device comprises a power supply interface 21, a control module 22, a working module 23. A loop unit 222 is connected to a first thyristor T1 and a second thyristor T2 through a first input end L of the power supply interface; and the working module is connected to a second avalanche tube and an avalanche tube protection fuse FU through a second input end N of the power supply interface. A main control unit 221 is connected between the first tube and the second tube so that the main control unit controls the loop unit to be connected when input voltage is greater than a conduction voltage of the second avalanche tube. A first avalanche tube is also connected with a current-limiting resistor R1 so that the first thyristor and the second thyristor work in a safe state.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] This application relates to the art of rail transit traction, and more particularly to a controllable overvoltage absorption device based traction system. [Background technology]

[0002] Due to the forced current exchange of large-capacity power electronic equipment in an electric locomotive, the electromagnetic environment of the electric locomotive's power supply system is very complex, and the large-capacity power electronic equipment includes a third winding of the transformer that supplies power to the electric locomotive and the vehicle's electrical equipment. Due to the complex electromagnetic environment of the locomotive, extremely high voltages exist in the third winding of the transformer, which is likely to cause damage to the electrical equipment in the locomotive's power supply system.

[0003] In the prior art, in order to ensure the normal operation of vehicle equipment, an overvoltage absorption device has been developed to protect vehicle electrical equipment so that it can operate normally. The prior art overvoltage absorption device eliminates or absorbs excessive voltage by continuously charging a capacitor in a varistor or RC circuit.

[0004] However, in the prior art, when absorbing excessive interference voltages by continuously charging the capacitor of the varistor and RC circuit, the residual voltage amplitude is high, causing the voltage across the varistor and RC circuit to exceed the safe voltage, resulting in the generation of other interference voltages. In addition, due to the low resistance of the varistor and the continuous charging characteristic of the RC circuit, other breakdowns may occur, increasing the potential risk of electrical equipment breakdown. Summary of the Invention [Problem to be solved by the invention]

[0005] The present application provides a controllable overvoltage absorption device based on a traction system to improve the efficiency of overvoltage resolution, and the stability and reliability of overvoltage resolution, and reduce the potential risk of electrical equipment failure. [Means for solving the problem]

[0006] The present application provides a traction system-based controllable overvoltage absorption device, which is arranged in an auxiliary power supply system that supplies power to a traction system and filters disturbance overvoltages of the auxiliary power supply system, the controllable overvoltage absorption device comprising: a power supply interface, a control module, and an operation module; the power supply interface has a first input end connected to the control module and a second input end connected to the operation module, and the power supply interface is for obtaining an input voltage including a positive half cycle of the AC input voltage and a negative half cycle of the AC input voltage; The control module includes a main control unit and a circuit unit, the main control unit is connected to the circuit unit to control the conduction of the circuit unit, and the circuit unit is connected to a first input terminal; The working module is connected to the second input terminal and also to the circuit unit, which is for connecting the working module to the circuit.

[0007] Optionally, the circuit unit comprises a first thyristor; A first end of the first thyristor is connected to the first input end, a second end of the first thyristor is connected to the working module, and a second end of the first thyristor is further connected to the main control unit.

[0008] Optionally, the circuit unit further comprises a second thyristor; A first end of the second thyristor is connected to the working module, a second end of the second thyristor is connected to the first input end, and a second end of the second thyristor is further connected to the main control unit; The first end of the second thyristor is also further connected to the second end of the first thyristor, and the second end of the second thyristor is further connected to the first end of the first thyristor.

[0009] Optionally, the main control unit comprises a first avalanche tube; A first end of the first avalanche tube is connected to a second end of a first thyristor in the circuit unit, and a second end of the first avalanche tube is connected to a second end of a second thyristor in the circuit unit.

[0010] Optionally, the main control unit obtains the input voltage of the power supply interface through the connection between the circuit unit and the power supply interface, and determines the state of the absorption device, including an operating state and a non-operating state, according to the input voltage; The conduction of the circuit unit is controlled in accordance with the operating state of the absorption device, and the disconnection of the circuit unit is controlled in accordance with the non-operating state of the absorption device.

[0011] Optionally, the active module comprises a second avalanche tube; a first end of the second avalanche tube connected to a second end of the first thyristor of the circuit unit, and the first end of the second avalanche tube further connected to a first end of the second thyristor of the circuit unit; The second end of the second avalanche tube is connected to the second end of the power supply interface.

[0012] Optionally, controlling the conduction of the circuit unit according to the operating state of the absorption device specifically includes: When the absorption device acquires and determines that the input voltage of the power supply interface is greater than the conduction voltage of the first avalanche tube of the main control unit, the main control unit controls the conduction of the circuit unit; Controlling the connection of the operating module to the auxiliary power supply circuit according to the conduction state of the circuit unit, thereby controlling the absorption device to be in an operating state at this time; In response, the operating module reduces the input voltage to a clamp voltage via the second avalanche tube.

[0013] Optionally, the control of disconnecting the circuit unit depending on the non-operating state of the absorption device may specifically include: When the absorption device acquires and determines that the input voltage of the power supply interface is smaller than the conduction voltage of the first avalanche tube of the main control unit, the main control unit controls the cut-off of the circuit unit; The method includes controlling the disconnection of the operating module from the auxiliary power supply circuit due to the disconnection state of the circuit unit, and controlling the absorption device to be in a non-operating state at this time.

[0014] Optionally, the operating module further comprises an avalanche tube protection fuse; The first end of the avalanche tube protection fuse is connected to the second end of the second avalanche tube, and the second end of the avalanche tube protection fuse is connected to the second input end of the power supply interface; When the avalanche tube protection fuse determines according to the input voltage that the corresponding input current is greater than the maximum safe current of the second avalanche tube, the avalanche tube protection fuse is blown to cut off the circuit current of the operating module.

[0015] Optionally, the main control unit further comprises a current limiting resistor; a first end of the current-limiting resistor connected to the first end of the first avalanche tube, and a second end of the current-limiting resistor connected to the second end of the second thyristor; The current limiting resistor is for controlling and triggering the circuit current of the first thyristor and the second thyristor in the circuit unit. [Effects of the Invention]

[0016] The controllable overvoltage absorption device based on the traction system provided by the present application comprises a power supply interface, a control module, and an operating module. The control module further comprises a main control unit and a circuit unit. The control module is connected to the circuit unit through a first input end of the power supply interface and a second input end of the control module is connected to the operating module. After a thyristor in the circuit unit is turned on, the control module is connected to the main control unit through the other end of the circuit unit. The main control unit controls the conduction and cut-off of the entire circuit of the circuit unit in which the thyristor is located, so that it is turned on. After the circuit unit is turned on, the circuit unit is connected to the operating module, and the operating module is connected to the power supply interface, thereby obtaining the input voltage and absorbing the overvoltage. The absorption device of the present application strengthens the control of overvoltage absorption, thereby further improving the absorption efficiency and enhancing the applicability of the absorption device in different scenarios, thereby improving the stability and reliability of overvoltage absorption. [Brief explanation of the drawings]

[0017] The accompanying drawings are incorporated in and constitute a part of this specification to illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. [Figure 1] FIG. 2 is an application scenario diagram of an overvoltage absorption device based on a traction system provided by an embodiment of the present application. [Figure 2] FIG. 2 is a schematic diagram of an overvoltage waveform provided by an embodiment of the present application. [Figure 3] 1 is a structural schematic diagram of an overvoltage absorption device based on a traction system provided by an embodiment of the present application; FIG. [Figure 4] 1 is a structural schematic diagram of an overvoltage absorption device based on a traction system provided by an embodiment of the present application; FIG. [Figure 5a] FIG. 2 is a structural schematic diagram of a controllable overvoltage absorption device based on a traction system provided by an embodiment of the present application. [Figure 5b] FIG. 2 is a structural schematic diagram of a controllable overvoltage absorption device based on a traction system provided by an embodiment of the present application. [Figure 6] FIG. 1 is a circuit principle diagram of a controllable overvoltage absorption device based on a traction system provided by an embodiment of the present application.

[0018] Specific examples of the present application are illustrated by the accompanying drawings mentioned above and described in more detail below. These drawings and contextual descriptions are not intended to limit the scope of the concepts of the present application in any way, but rather to explain the concepts of the present application to those skilled in the art by reference to specific examples. DETAILED DESCRIPTION OF THE INVENTION

[0019] Illustrative examples are described in detail herein, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numerals in different accompanying drawings represent the same or similar elements unless otherwise specified. The embodiments described in the following illustrative examples do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0020] It should be noted that the user information (including, but not limited to, user device information, user personal information, etc.) and data (including, but not limited to, data used for analysis, data to be stored, data to be displayed, etc.) related to this application are information and data authorized by the user or fully authorized by all parties, and the collection, use, and processing of related data must comply with the relevant laws, regulations, and standards of the relevant countries and regions, and an appropriate operation portal is provided for users to select permission or denial.

[0021] The terms "first," "second," "third," "fourth," etc., used in the specification and claims of this application, and in the drawings, are intended to distinguish between similar objects and not necessarily to describe a particular order or sequence. It should be understood that data used in this manner may be interchangeable where appropriate. For example, first information could be referred to as second information, and similarly, second information could be referred to as first information, without departing from the scope of this specification.

[0022] As used herein, the term "if" can be interpreted as "when," "when," or "depending on the decision," depending on the context.

[0023] Additionally, as used herein, the singular forms "a," "one," and "the" are intended to include the plural forms as well, unless the context indicates otherwise.

[0024] Furthermore, it should be understood that the terms "comprises" and "including" indicate the presence of features, steps, operations, components, assemblies, types, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, components, assemblies, types, and / or groups.

[0025] As used herein, the terms "or" and "and / or" are to be construed as inclusive or meaning either or any combination. Thus, "A, B, or C" or "A, B and / or C" means "any of A; B; C; A and B; A and C; B and C; A, B, and C." Exceptions to this definition occur only when combinations of elements, features, steps, or operations are in some way inherently exclusive of each other.

[0026] Railway transportation occupies an important position in economic development. As electric railways develop in the direction of high speed and heavy load, large-capacity power electronic equipment is increasingly being applied to electric locomotives. However, large-capacity power electronic equipment undergoes forced current exchange after operation and use in electric locomotives, making the electromagnetic environment of the electric locomotive power supply system very complex.

[0027] FIG. 1 is an application scenario diagram of an overvoltage absorption device based on a traction system provided by an embodiment of the present application. The application scenario includes a contact network 11, a pantograph 12, a traction system 13, and an auxiliary power supply system 14. The contact network is connected to the pantograph, and transmits energy from the contact network through the pantograph, and transmits the energy to the traction system and the auxiliary power supply system to power them. After the traction system and the auxiliary power supply system are operational, power is supplied to the traction system through the auxiliary power supply system.

[0028] Alternatively, the auxiliary power supply system may contain large-capacity power electronics, such as the third winding of a transformer in an electric locomotive. The third winding of the transformer is in the auxiliary power supply system and is used to supply power to the electric locomotive and its electrical equipment. The normal output current of the third winding of the transformer is 220V AC at 50Hz. However, due to the complex electromagnetic environment inside the electric locomotive, an extremely high voltage exists in the third winding of the transformer. The actual measured overvoltage waveform of the third winding of the transformer is shown in Figure 2. The voltage waveform shows that the highest peak voltage reaches 2202.3V at 17.822ms. The entire voltage waveform exhibits the characteristics of a relatively high amplitude and a long duration, so this high voltage is likely to damage the power equipment in the electric locomotive's power supply system.

[0029] For this reason, in the prior art, an overvoltage absorption device is usually added in the auxiliary power supply system of the electric locomotive, as shown in Figure 3, which is a structural schematic diagram of an overvoltage absorption device based on the traction system provided by the embodiment of the present application, in which the pantograph supplies energy to the traction system and the auxiliary power supply system, and is connected in parallel to both ends of the auxiliary power supply system through a varistor, so as to allow the varistor to absorb interference overvoltage.

[0030] However, in the prior art, when a varistor is used to absorb interference overvoltage, the amplitude of the absorbed interference voltage still remains high due to limitations on the varistor's own capacity, and the residual overvoltage after absorption exceeds the safe voltage of the auxiliary power supply system, making it difficult to significantly eliminate the overvoltage. Meanwhile, due to the characteristics of varistors, they are not suitable for frequent use in overvoltage situations, increasing the probability of failure. Furthermore, when a failure occurs, the varistor will enter a short-circuit state, which will create a potential risk of new failures in the electrical equipment, further reducing the efficiency, stability and applicability of overvoltage absorption.

[0031] In addition, in the prior art, interference overvoltages are filtered using an RC circuit. FIG. 4 is a structural schematic diagram of an overvoltage absorption device based on a traction system provided by an embodiment of the present application. As shown in FIG. 4, the structure supplies energy to the traction system and the auxiliary power supply system through a pantograph, and is connected in parallel to both ends of the auxiliary power supply system through an RC circuit so that the RC circuit absorbs interference overvoltages. The RC circuit includes a resistor and a capacitor connected in series to form an RC circuit.

[0032] However, in the prior art, when absorbing interference overvoltage using an RC circuit, the capacitor in the RC circuit charges and absorbs the overvoltage. However, because the interference overvoltage generated by the auxiliary power supply system has a high amplitude and long duration, if the capacitor continues to charge based on this high amplitude overvoltage, it will not have time to discharge. As a result, the voltage across the RC circuit will eventually exceed the safe voltage of the auxiliary power supply system. As a result, the interference overvoltage cannot be filtered out. Furthermore, the high amplitude of the interference voltage will damage the capacitor of the auxiliary power supply system, further affecting the overvoltage absorption effect.

[0033] Therefore, the auxiliary power supply system is subject to interference voltages with high amplitude, long duration, and energy levels similar to those of lightning strikes, and conventional filtering means in the prior art are unable to meet these needs. Therefore, in order to ensure the normal operation of the equipment on electric locomotives, it is necessary to improve the overvoltage absorption device to ensure the normal operation of the vehicle electrical equipment.

[0034] In order to solve the above problem, the present application provides a method for connecting a control module and an operating module using a power supply interface connected in parallel to an auxiliary power supply system, the control module including a main control unit and a circuit unit, and the main control unit controls the connection of the circuit unit and the operating module to the power supply interface, the device according to the present application has an operating state and a non-operating state, and obtains an input voltage from the power supply interface, and when the input voltage becomes smaller than the conduction voltage of a first avalanche tube in the main control unit, determines that the input voltage at this time does not reach the amplitude of the interference overvoltage, and While the device is in a non-operating state, if the input voltage becomes larger than the conduction voltage of the first avalanche tube in the main control unit, it is determined that the input voltage at this time has reached the amplitude of the interference overvoltage, and the device is put into an operating state. At this time, the second avalanche tube in the operating module eliminates the input voltage, and the circuit unit and the operating module are brought into conduction so that the amplitude of the input voltage is lower than the clamping voltage, thereby achieving the elimination of the interference overvoltage, thereby improving the stability, reliability and efficiency of the elimination of the interference overvoltage, protecting the power supply equipment and reducing the potential risk of failure of the electrical device.

[0035] The technical solutions of the present application will be described in detail below using specific examples. Some of the following examples can be combined with each other, and the same or similar concepts or processes may not be repeatedly described in some examples.

[0036] The controllable overvoltage absorber is disposed in an auxiliary power supply system that supplies power to a traction system, and as shown in Figure 5a, the controllable overvoltage absorber filters out disturbance overvoltages in the auxiliary power supply system.

[0037] FIG. 5b is a structural schematic diagram of a controllable overvoltage absorption device based on a traction system provided by an embodiment of the present application. As shown in FIG. 5b, the controllable overvoltage absorption device has a structure including a power supply interface 21, a control module 22, and an operating module 23.

[0038] Optionally, the power supply interface comprises a first input end and a second input end, the first input end being connected to the control module and the second input end being connected to the operation module.

[0039] Optionally, the power supply interface is for obtaining an input voltage including a positive half cycle of the AC input voltage and a negative half cycle of the AC input voltage.

[0040] More specifically, the control module 22 includes a main control unit 221 and a circuit unit 222, and the main control unit is connected to one end of the circuit unit, and the first input terminal is connected to the other end of the circuit unit, so that the main control unit is connected to the power supply interface via the circuit unit, and the main control unit is for controlling the conduction of the circuit unit.

[0041] Optionally, one end of the working module is connected to the second input end and further connected to a circuit unit, the circuit unit for connecting the working module to a circuit.

[0042] More specifically, one end of the operating module is connected to the second input end, and the other end of the operating module is for connecting to the circuit unit after the circuit unit is turned on, and the other end of the operating module is connected to the first input end of the power supply interface through the turned on circuit unit.

[0043] The controllable overvoltage absorption device based on the traction system of the present application comprises a power supply interface, a control module, and an operation module, and performs the operation of overvoltage absorption by controlling the connection of the operation module to the power supply interface by the control module, thereby achieving control of the operation conditions of the overvoltage absorption device, improving adaptability to absorption demand, improving service life, and reducing the probability of potential risk of failure.

[0044] Optionally, FIG. 6 is a circuit principle diagram of a controllable overvoltage absorption device based on a traction system provided by an embodiment of the present application. As shown in FIG. 6, the main control unit is provided with a first avalanche tube, the first end of the first avalanche tube is connected to the second end of the first thyristor in the circuit unit, and the second end of the first avalanche tube is connected to the second end of the second thyristor in the circuit unit.

[0045] Optionally, the first end of the second thyristor is further connected to the second end of the first thyristor, and the second end of the second thyristor is further connected to the first end of the first thyristor.

[0046] In one possible embodiment, the first avalanche tube is connected to a first input end L of the power supply interface via a first thyristor, and the first thyristor and a second thyristor are also connected to the first input end L of the power supply interface, the first thyristor is made conductive when the input voltage flowing through the first input end L is greater than the conduction voltage of the first thyristor, and the second thyristor is made conductive when the absolute value of the input voltage flowing through the first input end L is greater than the absolute value of the conduction voltage of the second thyristor. The power supply interface through which the input voltage flows has an AC input voltage L end and an AC input voltage N end, the L end waiting to enter the circuit unit via the first thyristor, and the N end waiting to enter the circuit unit via the second thyristor.

[0047] More specifically, as shown in FIG. 6 , the circuit unit 222 includes a first thyristor T1, a first end of which is connected to the first input end L of the power supply interface, a second end of which is connected to the operating module 23, and a second end of which is further connected to the main control unit 221.

[0048] In one possible embodiment, when the AC input voltage is in a positive half cycle and the positive half cycle of the AC input voltage is greater than the conduction voltage of the first thyristor, the first thyristor is made conductive so that the positive half cycle of the input voltage enters the circuit segment of the main control unit.

[0049] More specifically, as shown in FIG. 6 , the circuit unit further includes a second thyristor, a first end of which is connected to the operating module, a second end of which is connected to the first input end, and a second end of which is further connected to the main control unit.

[0050] In one possible embodiment, when the input AC voltage is in a negative half cycle and the absolute value of the input voltage in the negative half cycle is greater than the absolute value of the conduction voltage of the second thyristor, the second thyristor is made conductive so that the input voltage in the negative half cycle enters the circuit segment of the main control unit.

[0051] In one possible embodiment, the conduction voltage of the first thyristor is 15V and the conduction voltage of the second thyristor is -15V.

[0052] The controllable overvoltage absorption device based on the traction system of the present application achieves the conduction and interruption of the electric circuit by targeted processing and conduction by the first thyristor and the second thyristor in the circuit unit for the positive half cycle of the AC input voltage and the negative half cycle of the AC input voltage, realizes continuous and uninterrupted detection of the input voltage value, and when the input voltage value is greater than the conduction voltage of the first thyristor and / or the second thyristor, enters a control operation stage by the main control circuit for the operating module, strengthens the absorption and control of interference overvoltage, and controls intermittent conduction as necessary, thereby improving the service life of the device.

[0053] Optionally, the main control unit obtains the input voltage of the power supply interface through the connection between the circuit unit and the power supply interface, determines the state of the absorption device according to the input voltage, controls the conduction of the circuit unit according to the working state of the absorption device, and controls the disconnection of the circuit unit according to the non-working state of the absorption device, wherein the absorption device includes a working state and a non-working state.

[0054] In one possible embodiment, after the input voltage enters the circuit unit via the first thyristor and / or the second thyristor, the absorption device further obtains the input voltage value of the power supply interface, and when it determines that the input voltage value of the power supply interface is greater than the conduction voltage of the first avalanche tube of the main control unit, the main control unit controls the conduction of the circuit unit in which the first thyristor and / or the second thyristor is located, and controls the connection of the working module to the auxiliary power supply circuit according to the state of the circuit unit after conduction, so that the absorption device enters an operating state at this time.

[0055] In one possible embodiment, after the input voltage enters the circuit unit via the first thyristor and / or the second thyristor, the absorption device obtains the input voltage value of the power supply interface, and when it determines that the input voltage value of the power supply interface is smaller than the conducting voltage of the first avalanche tube of the main control unit, the main control unit controls the circuit unit to be cut off, and according to the cut-off state and / or non-conducting state of the circuit unit, controls the working module not to be connected to the auxiliary power supply circuit, and the absorption device is in a non-operating state at this time.

[0056] Optionally, the working module includes a second avalanche tube, the first end of the second avalanche tube is connected to the second end of the first thyristor of the circuit unit, the first end of the second avalanche tube is further connected to the first end of the second thyristor of the circuit unit, and the second end of the second avalanche tube is connected to the second end of the power supply interface.

[0057] Optionally, when the absorber is in an operating state, an operating module in the absorber absorbs the disturbance overvoltage from the input voltage through the second avalanche tube to reduce the input voltage to a clamp voltage, which is a voltage that is stabilized at a fixed voltage value after the second avalanche tube absorbs the disturbance overvoltage.

[0058] In one possible embodiment, the absorption device receives an input voltage through the power supply interface; when the input voltage is greater than the conduction voltage of the first thyristor or the second thyristor, the first thyristor and / or the second thyristor is turned on, and at this time the input voltage can pass through the first avalanche tube of the main control unit; and when the input voltage is greater than the conduction voltage of the first avalanche tube, the input voltage passes through the first avalanche tube; the main control unit controls the conduction of the circuit unit and passes the input voltage to the connection point between the second end of the first thyristor and the first end of the second thyristor, thereby connecting the operating module to the power supply interface, allowing the operating module to receive the input voltage, and absorbing interference overvoltage from the input voltage to reduce the peak value of the input voltage to the clamp voltage.

[0059] Optionally, the absorption device is deactivated when the absolute value of the input voltage drops to a value less than the absolute value of the conduction voltage of the first thyristor and / or the second thyristor.

[0060] Optionally, when the absolute value of the input voltage rises to be larger than the absolute value of the conduction voltage of the first thyristor and / or the second thyristor, it is determined whether the absolute value of the input voltage has risen to be larger than the conduction voltage of the first avalanche tube, and if the absolute value of the input voltage has not risen to be larger than the conduction voltage of the first avalanche tube, the absorption device is put into a non-operating state.

[0061] Optionally, when the absolute value of the input voltage rises to be larger than the absolute value of the conduction voltage of the first thyristor and / or the second thyristor, it is determined whether the absolute value of the input voltage has risen to be larger than the conduction voltage of the first avalanche tube, and if the absolute value of the input voltage has risen to be larger than the conduction voltage of the first avalanche tube, the absorption device is put into operation.

[0062] The controllable overvoltage absorption device based on the traction system of the present application enters the control stage of the main control circuit through the conduction of the first thyristor and the second thyristor, and when the input voltage is greater than the conduction voltage of the first avalanche tube of the main control circuit, it makes the entire circuit unit conduct, and connects the working module to the power supply interface through the connection point of the two thyristors in the circuit unit, so that the working module obtains the input voltage and absorbs it to reduce it to the voltage value of the clamping voltage, thereby achieving the absorption and elimination of interference overvoltage, strengthening the control of the elimination of interference overvoltage, further improving the efficiency of absorption and elimination, and improving the applicability of the absorption device in different scenarios.

[0063] Optionally, as shown in Figure 6, the working module further includes an avalanche tube protection fuse FU, a first end of the avalanche tube protection fuse is connected to the second end of the second avalanche tube, and the second end of the avalanche tube protection fuse is connected to the second input end N of the power supply interface. When the avalanche tube protection fuse determines according to the input voltage that the corresponding input current is greater than the maximum safe current of the second avalanche tube, the avalanche tube protection fuse is blown to cut off the circuit current of the working module.

[0064] Optionally, the main control unit further includes a current-limiting resistor R1, a first end of which is connected to the first end of the first avalanche tube, and a second end of which is connected to the second end of the second thyristor, for controlling and triggering the circuit currents of the first thyristor and the second thyristor in the circuit unit.

[0065] In the controllable overvoltage absorption device based on the traction system of the present application, the first avalanche tube is connected in series with a current-limiting resistor to achieve the circuit protection function when current flows to the main control unit after the first thyristor and / or the second thyristor is turned on, thereby enhancing safety protection for the device; and the second avalanche tube is connected in series with an avalanche tube protection fuse, so that when the second avalanche tube is absorbing overvoltage in the operating state, if the amplitude of the overvoltage is too high and causes a high current, the current of the operating module is cut off, thereby avoiding wear and tear on the device and parts and improving the safety of the device.

[0066] It will be understood that in some embodiments provided by the present application, the disclosed apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely examples, and the division of modules, which is merely a logical division of function, may be divided in other ways when actually implemented. For example, multiple modules may be combined or integrated into another system, or some features may be ignored or not implemented. Furthermore, the illustrated or described couplings or direct couplings or communication connections between each other may be indirect couplings or communication connections via some interface, device, or module, which may be electrical, mechanical, or other forms.

[0067] The modules may be physically separated, for example, installed in different locations on a single device, installed in different devices, distributed across multiple network units, or distributed across multiple processors. The modules may also be integrated, for example, installed on the same device or integrated into a code set. The modules may exist in the form of hardware, software, or a combination of software and hardware. The present application may select some or all of the modules according to actual needs to achieve the objectives of the solutions of the present embodiment.

[0068] Other embodiments of the present application will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention(s) herein. This application is intended to cover any modifications, uses, or adaptations of the present application in accordance with the general principles of the present application, including common sense or customary technical means known in the art but not claimed herein. The specification and examples are considered exemplary, with the true scope and spirit of the present application being indicated by the following claims.

[0069] It should be understood that the present application is not limited to the exact construction described above and illustrated in the accompanying drawings, and that various modifications and variations are possible without departing from the scope thereof, which is limited only by the appended claims.

Claims

1. An overvoltage absorption device based on a traction system, the overvoltage absorption device being disposed in an auxiliary power supply system that supplies power to the traction system, the overvoltage absorption device filtering a disturbance overvoltage of the auxiliary power supply system, the overvoltage absorption device comprising: a power supply interface, a control module, and an operation module; the power supply interface has a first input end connected to the control module and a second input end connected to the operation module, and the power supply interface is for obtaining an input voltage including a positive half cycle of an AC input voltage and a negative half cycle of the AC input voltage; The control module includes a main control unit and a circuit unit, the main control unit is connected to the circuit unit to control the conduction of the circuit unit, and the circuit unit is connected to the first input terminal; the operating module is connected to the second input terminal, and the operating module is further connected to the circuit unit for connecting the operating module to a circuit; the circuit unit comprises a first thyristor and a second thyristor, the main control unit comprises a first avalanche tube, the operating module comprises a second avalanche tube, the first thyristor and the second thyristor each have a first end and a second end opposite to each other, the first end being a terminal through which a main current flows in, and the second end being a terminal through which a main current flows out; an input voltage absorbing device for absorbing interference overvoltage from the input voltage by the first avalanche tube of the main control unit, the input voltage passing through the first avalanche tube of the main control unit when the input voltage is greater than the conduction voltage of the first thyristor or the second thyristor; and an input voltage absorbing device for absorbing interference overvoltage from the input voltage by the first avalanche tube of the main control unit when the input voltage is greater than the conduction voltage of the first avalanche tube, the input voltage passing through the connection point between the second end of the first thyristor and the first end of the second thyristor, the input voltage absorbing device for absorbing interference overvoltage from the input voltage by the first avalanche tube, the input voltage absorbing device for absorbing interference overvoltage from the input voltage by the first avalanche tube, the input voltage absorbing device for absorbing interference overvoltage from the input voltage by the first avalanche tube

2. An overvoltage absorption device as described in claim 1, characterized in that a first end of the first thyristor is connected to a first input end of the power supply interface, a second end of the first thyristor is connected to an operating module, and the second end of the first thyristor is further connected to the main control unit.

3. A first end of the second thyristor is connected to an operating module, a second end of the second thyristor is connected to a first input end, and a second end of the second thyristor is further connected to the main control unit; 3. The overvoltage absorption device according to claim 2, wherein the first end of the second thyristor is further connected to the second end of the first thyristor, and the second end of the second thyristor is further connected to the first end of the first thyristor.

4. An overvoltage absorption device as described in claim 1, characterized in that a first end of the first avalanche tube is connected to a second end of a first thyristor in the circuit unit, and a second end of the first avalanche tube is connected to a second end of a second thyristor in the circuit unit.

5. The main control unit obtains an input voltage of the power supply interface through a connection between the circuit unit and the power supply interface, and determines a state of the overvoltage absorption device according to the input voltage, including an operating state and a non-operating state, when the overvoltage absorption device is in the operating state, the operating module removes the input voltage through the second avalanche tube, and when the overvoltage absorption device is in the non-operating state, the operating module does not remove the input voltage; determining that the circuit unit in which the first thyristor and / or the second thyristor is located is in a conductive state according to the operating state of the overvoltage absorption device, and determining that the circuit unit in which the first thyristor and / or the second thyristor is located is in a cut-off state according to the non-operating state of the overvoltage absorption device; Determining whether the circuit unit including the first thyristor and / or the second thyristor is in a conductive state according to the operating state of the overvoltage absorption device includes: When the overvoltage absorption device acquires and determines that the input voltage of the power supply interface is greater than the conduction voltage of the first avalanche tube of the main control unit, determining that the overvoltage absorption device is in an operating state at this time and that the circuit unit in which the first thyristor and / or the second thyristor are located is in a conducting state at this time; the operation module reduces the input voltage to a clamp voltage via the second avalanche tube in response to control of the operation module to connect the circuit unit to an auxiliary power supply circuit of the auxiliary power supply system according to the conduction state of the circuit unit; Determining that the circuit unit including the first thyristor and / or the second thyristor is in an interrupted state according to the non-operating state of the overvoltage absorption device includes: When the overvoltage absorption device acquires and determines that the input voltage of the power supply interface is smaller than the conduction voltage of the first avalanche tube of the main control unit, it determines that the overvoltage absorption device is in a non-operating state at this time, and that the circuit unit in which the first thyristor and / or the second thyristor are located is in a cut-off state at this time; 5. The overvoltage absorption device according to claim 4, further comprising: controlling the operating module so as not to be connected to the auxiliary power supply circuit of the auxiliary power supply system depending on the interruption state of the circuit unit.

6. A first end of the second avalanche tube is connected to a second end of a first thyristor of a circuit unit, and the first end of the second avalanche tube is further connected to a first end of a second thyristor of the circuit unit; 2. The overvoltage absorbing device according to claim 1, wherein the second end of the second avalanche tube is connected to the second end of the power supply interface.

7. The operating module further comprises an avalanche tube protection fuse; a first end of the avalanche tube protection fuse is connected to a second end of the second avalanche tube, and a second end of the avalanche tube protection fuse is connected to a second input end of the power supply interface; 7. The overvoltage absorption device according to claim 6, wherein the avalanche tube protection fuse cuts off the circuit current of the operating module by blowing the avalanche tube protection fuse when it determines, according to the input voltage, that the corresponding input current is greater than the maximum safe current of the second avalanche tube.

8. the main control unit further comprises a current limiting resistor; a first end of the current-limiting resistor connected to a first end of the first avalanche tube, and a second end of the current-limiting resistor connected to a second end of the second thyristor; 2. The overvoltage absorption device according to claim 1, wherein the current limiting resistor controls and triggers the circuit current of the first thyristor and the second thyristor in the circuit unit, thereby achieving a circuit protection function when current flows to the main control unit after the first thyristor and / or the second thyristor is turned on.

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