Controllable overvoltage absorption device 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 technology of rail transit traction, and in particular, to a controllable overvoltage absorption device based on a traction system.

Background Art

[0002] In an electric locomotive, due to the forced current exchange in a large-capacity power electronics device, the electromagnetic environment of the power supply system of the electric locomotive becomes very complex. The large-capacity power electronics device is provided with a third winding of a transformer that supplies power to the electric locomotive and vehicle electrical devices. Because the electromagnetic environment of the locomotive is complex, there is an extremely high voltage in the third winding of the transformer, which is likely to cause damage to the electrical devices in the power supply system of the locomotive.

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

[0004] However, in the prior art, when absorbing excessive interference voltage by continuously charging a capacitor in a varistor and an RC circuit, since the amplitude of the residual voltage is high, the voltage across both ends of the varistor and the RC circuit exceeds the safety voltage, and other interference voltages are generated. In addition, due to the low-resistance characteristic of the varistor and the continuous charging characteristic of the RC circuit, other failures may occur, and the potential risk of failure of the electrical device also increases.

Summary of the Invention

Problems to be Solved by the Invention

[0005] This application provides a controllable overvoltage absorption device based on a traction system for improving the elimination efficiency of excessive voltage, and the stability and reliability of the elimination of excessive voltage, and reducing the potential risk of failure of electrical devices.

Means for Solving the Problem

[0006] This application provides a controllable overvoltage absorption device based on a traction system, which is arranged in an auxiliary power supply system for supplying power to the traction system and filters the interference overvoltage of the auxiliary power supply system. The controllable overvoltage absorption device includes a power supply interface, a control module, and an operation module. The power supply interface includes a first input end connected to the control module and a second input end connected to the operation module. The power supply interface is for obtaining an input voltage including a positive half-cycle 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. The circuit unit is connected to the first input end. The operation module is connected to the second input end and also to the circuit unit. The circuit unit is for connecting the operation module to the circuit.

[0007] Optionally, the circuit unit includes a first thyristor. The first end of the first thyristor is connected to the first input end. The second end of the first thyristor is connected to the operation module. The second end of the first thyristor is further connected to the main control unit.

[0008] Optionally, the circuit unit further includes a second thyristor. The first end of the second thyristor is connected to the operation module. The second end of the second thyristor is connected to the first input end. The 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. The second end of the second thyristor is further connected to the first end of the first thyristor.

[0009] Optionally, the main control unit includes 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.

[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, determines the state of the absorption device including the operating state and the non-operating state according to the input voltage, controls the conduction of the circuit unit according to the operating state of the absorption device, and controls the disconnection of the circuit unit according to the non-operating state of the absorption device.

[0011] Optionally, the operating 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, and the first end of the second avalanche tube is further connected to the 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 obtains 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 to control the absorption device to be in the operating state at this time; Accordingly, the operating module reduces the input voltage to the clamping voltage through the second avalanche tube.

[0013] Optionally, controlling the disconnection of the circuit unit according to the non-operating state of the absorption device specifically includes: When the absorption device obtains and determines that the input voltage of the power supply interface is smaller than the conduction voltage of the first avalanche diode of the main control unit, the main control unit controls the circuit unit to be cut off, controls the operating module not to connect to the auxiliary power supply circuit according to the cut-off state of the circuit unit, and controls the absorption device to be in a non-operating state at this time.

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

[0015] Optionally, the main control unit further includes a current limiting resistor. The first end of the current limiting resistor is connected to the first end of the first avalanche diode, and the second end of the current limiting resistor is connected to the second end of the second thyristor. The current limiting resistor is used to control and trigger the circuit currents of the first thyristor and the second thyristor in the circuit unit.

Advantages of the Invention

[0016] The controllable overvoltage absorption device based on the traction system provided by the present application includes a power supply interface, a control module, and an operation module. The control module further includes a main control unit and a circuit unit. It is connected to the circuit unit through the first input end of the power supply interface, and the second input end is connected to the operation module. After the thyristor in the circuit unit is turned on, it is connected to the main control unit through the other end of the circuit unit. The main control unit is configured to control the conduction and interruption of the entire circuit of the circuit unit where the thyristor is arranged to conduct. After the circuit unit is turned on, through the connection between the circuit unit and the operation module, the operation module is connected to the power supply interface, thereby obtaining the input voltage and performing overvoltage absorption. The absorption device according to the present application further improves the absorption efficiency by strengthening the control of overvoltage absorption, and improves the stability and reliability of overvoltage absorption by strengthening the applicability of the absorption device in different scenarios.

Brief Description of the Drawings

[0017] The attached drawings of this specification are incorporated into the specification and constitute a part of this specification showing embodiments consistent with the present application, and are used together with the specification to explain the principle of the present application.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5a

Figure 5b

Figure 6

[0018] Specific embodiments of the present application are shown by the above-mentioned accompanying drawings, and further detailed descriptions will be given later. The descriptions based on these accompanying drawings and context are not intended to limit the scope of the concept of the present application in any way. Rather, by referring to specific embodiments, it is intended to explain the concept of the present application to those skilled in the art.

Embodiments for Carrying out the Invention

[0019] In this specification, exemplary embodiments are described in detail and the examples are shown in the accompanying drawings. In the following description, when it is related to the description of the accompanying drawings, unless otherwise specifically stated, the same numerals in different accompanying drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments that conform to the present application. Rather, these are merely examples of devices and methods that conform to some aspects of the present application as described in detail in the appended claims.

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

[0021] In the specification, claims, and drawings of the present application, terms such as "first," "second," "third," "fourth," etc. are used to distinguish similar objects and do not necessarily explain a specific order or sequence. It should be understood that the data used in this way is interchangeable when appropriate. For example, without departing from the scope of this specification, the first information can be referred to as the second information, and similarly, the second information can be referred to as the first information.

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

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

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

[0025] The terms "or" and "and / or" as used herein are interpreted as inclusive or meaning any one or any combination. Thus, "A, B, or C" or "A, B and / or C" means "A; B; C; A and B; A and C; B and C; any of A, B, and C." An exception to this definition occurs only when the combination of components, functions, steps, or operations is mutually exclusive in some form.

[0026] Railway transportation occupies an important position in economic development. As electric railways develop in the direction of high speed and heavy load, although large-capacity power electronics equipment is often applied to electric locomotives, after the large-capacity power electronics equipment operates and is used in an electric locomotive, there is a forced current exchange. Therefore, the electromagnetic environment of the power supply system of the electric locomotive has become extremely complex.

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

[0028] Optionally, in the auxiliary power supply system, for example, there is large-capacity power electronics equipment such as the third winding of a transformer in an electric locomotive. The third winding of the transformer exists in the auxiliary power supply system and is used to supply power to the electric locomotive and vehicle electrical devices. The normal output current of the third winding of the transformer is a 220V AC current at 50Hz. However, due to the complex electromagnetic environment inside the electric locomotive, there is an extremely high voltage in the third winding of the transformer. The actually measured overvoltage waveform of the third winding of the transformer is shown in FIG. 2, indicating that the voltage waveform reaches 2202.3V at 17.822ms at the highest peak voltage. Since the entire voltage waveform shows characteristics of relatively high amplitude and long duration, this high voltage is likely to damage the power equipment in the power supply system of the electric locomotive.

[0029] Therefore, in the prior art, an overvoltage absorption device is usually added to the auxiliary power supply system of an electric locomotive. As shown in FIG. 3, FIG. 3 is a schematic structural diagram of an overvoltage absorption device based on the traction system provided by the embodiment of the present application. 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 via a varistor, so that the varistor absorbs the interfering overvoltage.

[0030] However, in the prior art, when using a varistor to absorb interfering overvoltage, due to the limitation of the varistor's own capabilities, the amplitude of the absorbed interfering voltage still has a high voltage, and the residual overvoltage after absorption exceeds the safety voltage of the auxiliary power supply system. It is difficult to greatly eliminate the overvoltage. On the other hand, because the varistor is not suitable for frequent use in overvoltage scenarios due to its own characteristics, the probability of failure increases. And when a failure occurs in the varistor, it will be in a short-circuit state. At this time, due to the short-circuit of the varistor, the electrical device generates a potential risk of a new failure, so the overvoltage absorption efficiency, stability and applicability are further reduced.

[0031] Also, in the prior art, interfering overvoltage is filtered using an RC circuit. FIG. 4 is a schematic structural diagram of an overvoltage absorption device based on the traction system provided by the embodiment of the present application. As shown in FIG. 4, in this structure, energy is supplied to the traction system and the auxiliary power supply system via a pantograph, and an RC circuit is connected in parallel to both ends of the auxiliary power supply system via the RC circuit to absorb the interfering overvoltage. The RC circuit includes a resistor and a capacitor connected in series that constitute the RC circuit.

[0032] However, in the prior art, when absorbing the interference overvoltage using an RC circuit, while the capacitor in the RC circuit charges and absorbs the overvoltage, since the interference overvoltage generated by the auxiliary power supply system has a high amplitude and a long duration, if the capacitor continues to charge based on this high-amplitude overvoltage, there will be no time for discharging. As a result, the voltage across both ends of the RC circuit will ultimately be higher than the safety voltage of the auxiliary power supply system. Consequently, not only can the interference overvoltage not be filtered, but also due to the high amplitude of the interference voltage, the capacitor of the auxiliary power supply system will be damaged, further affecting the overvoltage absorption effect.

[0033] Therefore, there is interference voltage with a high amplitude, a long duration, and energy at the same level as lightning strikes in the auxiliary power supply system. Since the conventional filtering means of the prior art cannot meet the needs at all, in order to ensure the normal operation of the electric locomotive equipment, it is necessary to improve the overvoltage absorption device to ensure the normal operation of the vehicle electrical equipment.

[0034] In response to the above problems, the present application connects a control module and an operating module using a power supply interface connected in parallel to an auxiliary power supply system. The control module includes a main control unit and a circuit unit. The main control unit controls the connection of the circuit unit to the power supply interface of the operating module. The device according to the present application includes an operating state and a non-operating state. The device acquires an input voltage from the power supply interface. When the input voltage is smaller 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 not reached the amplitude of the interference overvoltage, and the device is set to the non-operating state. On the other hand, when the input voltage is 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 set to the 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 conducted so that the amplitude of the input voltage becomes lower than the clamp voltage, thereby achieving the elimination of the interference overvoltage, 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] Hereinafter, specific embodiments will be used to explain in detail the technical solutions of the present application. Several of the following embodiments can be combined with each other, and similar or similar concepts or processes may not be repeatedly described in some embodiments.

[0036] The controllable overvoltage absorption device is arranged in an auxiliary power supply system that supplies power to a traction system. As shown in Figure 5a, the controllable overvoltage absorption device filters the interference overvoltage of the auxiliary power supply system.

[0037] Figure 5b is a schematic structural diagram of a controllable overvoltage absorption device based on the traction system provided by an embodiment of the present application. As shown in Figure 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 includes a first input terminal and a second input terminal. The first input terminal is connected to the control module, and the second input terminal is connected to the operation module.

[0039] Optionally, the power supply interface is for obtaining an input voltage including a positive half-cycle 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. One end of the circuit unit is connected to the main control unit, and the other end of the circuit unit is connected to the first input terminal. In this way, the main control unit is connected to the power supply interface through the circuit unit, and the main control unit is for controlling the conduction of the circuit unit.

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

[0042] Even more specifically, one end of the operation module is connected to the second input terminal. After the circuit unit is conducted, the other end of the operation module is for connecting to the circuit unit, and the other end of the operation module is connected to the first input terminal of the power supply interface through the conducted circuit unit.

[0043] The controllable overvoltage absorption device based on the traction system according to the present application includes a power supply interface, a control module, and an operation module. By controlling the connection of the operation module to the power supply interface by the control module, the overvoltage absorption operation is performed, the control of the operation conditions of the overvoltage absorption device is achieved, the adaptability to the absorption demand is enhanced, the service life is improved, and the probability of the potential risk of failure is reduced.

[0044] Optionally, FIG. 6 is a circuit schematic diagram of a controllable overvoltage absorption device based on the traction system provided by the embodiments of the present application. As shown in FIG. 6, the main control unit includes 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 the first input terminal L of the power supply interface via the first thyristor, and the first thyristor and the second thyristor are also connected to the first input terminal L of the power supply interface. When the input voltage flowing through the first input terminal L is greater than the conduction voltage of the first thyristor, the first thyristor is turned on. When the absolute value of the input voltage flowing through the first input terminal L is greater than the absolute value of the conduction voltage of the second thyristor, the second thyristor is turned on. The power supply interface through which the input voltage flows includes an AC input voltage L terminal and an AC input voltage N terminal. The L terminal waits to enter the circuit unit through the first thyristor, and the N terminal waits to enter the circuit unit through the second thyristor.

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

[0048] In one possible embodiment, when the AC input voltage is in the positive half cycle and the AC input voltage in the positive half cycle is greater than the conduction voltage of the first thyristor, the first thyristor is turned on so that the input voltage in the positive half cycle 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. The first end of the second thyristor is connected to the operating module, the second end of the second thyristor is connected to the first input end, and the second end of the second thyristor is further connected to the main control unit.

[0050] In one possible embodiment, when the input AC voltage is in the 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 turned on 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 according to the present application achieves conduction and interruption of the electrical circuit through targeted processing and conduction of the first thyristor and the second thyristor in the circuit unit for the positive half cycle and the negative half cycle of the AC input voltage, realizes continuous and non-interrupted detection of the input voltage value, and when it is greater than the conduction voltage of the first thyristor and / or the second thyristor, enters the control operation stage of the main control circuit for the operating module, strengthens the absorption and control of the interfering overvoltage, and controls intermittent conduction as needed to improve 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 operating state of the absorption device, and controls the disconnection of the circuit unit according to the non-operating state of the absorption device. The absorption device includes an operating state and a non-operating 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 acquires the input voltage value of the power supply interface, and when it is determined that the input voltage value of the power supply interface is greater than the conduction voltage of the first avalanche diode of the main control unit, the main control unit controls the conduction of the circuit unit where the first thyristor and / or the second thyristor are arranged, and controls the connection of the operating module to the auxiliary power supply circuit according to the state after the conduction of the circuit unit, so as to control the absorption device to be in 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 acquires the input voltage value of the power supply interface, and when it is determined that the input voltage value of the power supply interface is less than the conduction voltage of the first avalanche diode of the main control unit, the main control unit controls the cut-off of the circuit unit, and controls the operating module not to connect to the auxiliary power supply circuit according to the cut-off state and / or non-conduction state of the circuit unit, so that the absorption device is in a non-operating state at this time.

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

[0057] Optionally, when the absorption device is in an operating state, the operating module in the absorption device absorbs the interfering overvoltage from the input voltage through the second avalanche diode, and reduces the input voltage to the clamping voltage. The clamping voltage is the voltage fixed value to which the voltage is stabilized after the second avalanche diode absorbs the interfering overvoltage.

[0058] In one possible embodiment, the absorption device obtains an input voltage via a 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. At this time, the input voltage can pass through the first avalanche diode of the main control unit. When the input voltage is greater than the conduction voltage of the first avalanche diode, the input voltage passes through the first avalanche diode. The main control unit controls the conduction of the circuit unit and allows the input voltage to pass through 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, enabling the operating module to obtain the input voltage, absorbing the interfering overvoltage from the input voltage, and reducing the peak value of the input voltage to the clamping voltage.

[0059] Optionally, when the absolute value of the input voltage drops until it is less than the absolute value of the conduction voltage of the first thyristor and / or the second thyristor, the absorption device enters a non-operating state.

[0060] Optionally, when the absolute value of the input voltage rises until it is greater 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 until it is greater than the conduction voltage of the first avalanche diode. If the absolute value of the input voltage has not risen until it is greater than the conduction voltage of the first avalanche diode, the absorption device enters a non-operating state.

[0061] Optionally, when the absolute value of the input voltage rises until it is greater 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 until it is greater than the conduction voltage of the first avalanche diode. If the absolute value of the input voltage has risen until it is greater than the conduction voltage of the first avalanche diode, the absorption device enters an operating state.

[0062] The controllable overvoltage absorption device based on the traction system according to 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, the entire circuit unit is made conductive, and the operating module is connected to the power supply interface through the connection point of the two thyristors in the circuit unit. In this way, the operating module acquires the input voltage and absorbs it so as to reduce it to the voltage value of the clamping voltage, achieving the absorption and elimination of the interfering overvoltage, strengthening the control of the elimination of the interfering overvoltage to further improve the absorption and elimination efficiency, and improving the applicability of the absorption device in different scenarios.

[0063] Optionally, as shown in FIG. 6, the operating module further includes an avalanche tube protection fuse FU. 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 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 circuit current of the operating module is cut off by blowing the avalanche tube protection fuse.

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

[0065] The controllable overvoltage absorption device based on the traction system according to the present application achieves the circuit protection function when the current flows to the main control unit after the first thyristor and / or the second thyristor are turned on by connecting the first avalanche tube in series with the current limiting resistor, strengthens the safety protection for the device, and connects the second avalanche tube in series with the avalanche tube protection fuse. During the process of the second avalanche tube absorbing overvoltage in the operating state, when the amplitude of the overvoltage is too high and causes a high current, the current of the operating module is cut off, avoiding the consumption of the device and components, and improving the use safety of the device.

[0066] In some embodiments provided by the present application, it will be understood that the disclosed devices and methods may be implemented in other ways. For example, the above-described device embodiments are merely illustrative. For example, the division of modules, which is merely a logical function division, may be divided in another way when actually implemented. For example, a plurality of modules may be combined, integrated into another system, or some features may be ignored or not implemented. Also, the couplings, direct couplings, or communication connections illustrated or described between each other may be indirect couplings or communication connections through some interface, device, or module in electrical, mechanical, or other forms.

[0067] Each module may be physically separated, for example, attached to different positions of one device, attached to different devices, distributed among a plurality of network units, or distributed among a plurality of processors. Each module may be integrated, for example, installed on the same device or integrated into a set of codes. Each module may exist in the form of hardware, in the form of software, or implemented in the form of software and hardware. The present application can select some or all of the modules according to actual needs to achieve the purpose of the solution of this embodiment.

[0068] Other embodiments of the present application will be readily envisioned by those skilled in the art in view of the present specification and the practice of the invention as set forth herein. The present application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include known general knowledge or conventional technical means in the art that are not claimed in the present application. The present specification and examples are to be considered illustrative, and the true scope and spirit of the present application are indicated by the following claims.

[0069] It should be understood that the present application is not limited to the exact structures shown in the accompanying drawings described above, and various modifications and changes can be made without departing from its scope. The scope of the present application is limited only by the appended claims.

Claims

1. A controllable overvoltage absorption device based on a traction system, wherein the controllable overvoltage absorption device is arranged in an auxiliary power supply system that supplies power to the traction system, the controllable overvoltage absorption device filters out interference overvoltage of the auxiliary power supply system, and the controllable overvoltage absorption device comprises a power supply interface, a control module, and an operation module. The power supply interface comprises 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 and a negative half-cycle of an AC input voltage. The control module comprises 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 end. The operation module is connected to the second input end, and the operation module is further connected to the circuit unit for connecting the operation module to a circuit, and is characterized in that it is a controllable overvoltage absorption device based on a traction system.

2. 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 operation module, and the second end of the first thyristor is further connected to the main control unit, and is characterized in that it is the controllable overvoltage absorption device according to Claim 1.

3. The circuit unit further comprises a second thyristor. A first end of the second thyristor is connected to the operation module, a second end of the second thyristor is connected to the first input end, the second end of the second thyristor is further connected to the main control unit, 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, and is characterized in that it is the controllable overvoltage absorption device according to Claim 2.

4. The main control unit comprises 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. The controllable overvoltage absorption device according to claim 1, characterized in that.

5. 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 controllable overvoltage absorption device including the operating state and the non-operating state according to the input voltage. The controllable overvoltage absorption device according to claim 4, characterized in that the conduction of the circuit unit is controlled according to the operating state of the controllable overvoltage absorption device, and the disconnection of the circuit unit is controlled according to the non-operating state of the controllable overvoltage absorption device.

6. The operating module includes a second avalanche tube. The first end of the second avalanche tube is connected to the second end of the first thyristor in the circuit unit, and the first end of the second avalanche tube is further connected to the first end of the second thyristor in the circuit unit. The controllable overvoltage absorption device according to claim 1, characterized in that the second end of the second avalanche tube is connected to the second end of the power supply interface.

7. Controlling the conduction of the circuit unit according to the operating state of the controllable overvoltage absorption device specifically includes: When the controllable overvoltage absorption device obtains 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, so as to control the controllable overvoltage absorption device to be in the operating state at this time. Accordingly, the operating module reduces the input voltage to the clamping voltage through the second avalanche tube. The controllable overvoltage absorption device according to claim 5, characterized in that it includes.

8. Controlling the disconnection of the circuit unit according to the non-operating state of the controllable overvoltage absorption device specifically includes: When the controllable overvoltage absorption device obtains and determines that the input voltage of the power supply interface is smaller than the conduction voltage of the first avalanche diode of the main control unit, the main control unit controls the disconnection of the circuit unit, and controls, according to the disconnection state of the circuit unit, that the operating module does not connect to the auxiliary power supply circuit, so that the controllable overvoltage absorption device is in a non-operating state at this time. The controllable overvoltage absorption device according to claim 7 is characterized by including the above.

9. The operating module further includes an avalanche diode protection fuse, wherein a first end of the avalanche diode protection fuse is connected to a second end of the second avalanche diode, and a second end of the avalanche diode protection fuse is connected to a second input end of the power supply interface, and when the avalanche diode protection fuse determines, according to the input voltage, that the corresponding input current is greater than the maximum safe current of the second avalanche diode, the avalanche diode protection fuse blows to cut off the circuit current of the operating module. The controllable overvoltage absorption device according to claim 6 is characterized by the above.

10. The main control unit further includes a current limiting resistor, wherein a first end of the current limiting resistor is connected to a first end of the first avalanche diode, and a second end of the current limiting resistor is connected to a second end of the second thyristor, and the current limiting resistor is for controlling and triggering the circuit currents of the first thyristor and the second thyristor in the circuit unit. The controllable overvoltage absorption device according to claim 1 is characterized by the above.

Images