DC High-Voltage Ultra-High-Power IGBT Short-Circuit Protection Circuit

Abstract

This application relates to a short-circuit protection circuit for a DC high-voltage ultra-high-power IGBT. Among them, the master and slave drive modules are used to synchronously control multiple parallel-connected IGBTs respectively, and the output current is detected by the over-current detection module, so that the on and off control of the DC high-voltage ultra-high-power power supply can be realized. After abnormalities such as short circuit or over-current occur in the load, the power supply can be cut off within microseconds, solving the problem of too long response time of existing short-circuit protection devices and effectively protecting the safety of the load and related circuits. This short-circuit protection circuit can be used in various occasions such as traction and railway power supply to effectively protect electrical equipment.

Description

Technical Field

[0001] This application relates to the technical field of short - circuit protection, and particularly to a short - circuit protection circuit for a DC high - voltage and ultra - high - power IGBT. Background Art

[0002] At present, high - power short - circuit protection devices all use mechanical tripping, and the response time is in the millisecond level. When an over - current or short - circuit fault occurs in the load, due to the too long response time of the protection device, it is easy to damage the switching device and the load, and it is also easy to trigger the protection tripping of the superior power supply department, thus affecting the normal use of other power supply lines. In addition, if the contact point adheres and cannot be separated, the fault range will be expanded, and even personal injury and major equipment accidents will occur, causing economic losses. Therefore, there is an urgent need for a DC high - voltage and ultra - high - power circuit protection switch with a fast enough response speed. Summary of the Invention

[0003] This application provides a short - circuit protection circuit for a DC high - voltage and ultra - high - power IGBT to solve the problem of too long response time of high - power short - circuit protection devices in the prior art.

[0004] The above object of this application is achieved by the following technical solutions:

[0005] An embodiment of this application provides a short - circuit protection circuit for a DC high - voltage and ultra - high - power IGBT, which includes:

[0006] Multiple parallel - connected IGBTs, a main drive module, at least one slave drive module, and an over - current detection module; wherein,

[0007] The collectors of the multiple IGBTs are connected together as the input end of the DC high - voltage and ultra - high - power power supply; the gate of each IGBT is connected to the control signal output end of the main drive module or the control signal output end of the slave drive module; the emitters of the multiple IGBTs are connected together as the output end of the DC high - voltage and ultra - high - power power supply for connecting to the load;

[0008] The main drive module and the slave drive module are connected through a parallel interface, and the main drive module drives the slave drive module to act synchronously after receiving a trigger signal;

[0009] The over - current detection module is connected to the detection signal input end of the main drive module, and is used to detect the output current at the output end of the DC high - voltage and ultra - high - power power supply and send it to the main drive module; when the main drive module determines that the output current exceeds a preset value, it synchronously controls each IGBT to be in the off state with the slave drive module to cut off the output of the DC high - voltage and ultra - high - power power supply.

[0010] Optionally, the short - circuit protection circuit further includes a remote control module connected to the main drive module;

[0011] The remote control module is configured to send a trigger signal to the main drive module based on user operations to control the operating states of the main drive module and the slave drive module.

[0012] Optionally, the remote control module includes an alarm unit;

[0013] When the main drive module determines that the output current exceeds a preset value, it also sends an alarm signal to the remote control module to cause the alarm unit to give an alarm.

[0014] Optionally, the remote control module is connected to the main drive module through an optical fiber.

[0015] Optionally, the over - current detection module includes a Hall current sensor.

[0016] Optionally, the power input terminal of the main drive module is connected to a power supply through a high - voltage isolation module.

[0017] Optionally, the short - circuit protection circuit further includes a temperature detection module connected to the detection signal input terminal of the main drive module;

[0018] The temperature detection module is configured to detect the ambient temperature where the short - circuit protection circuit is located and send the detected ambient temperature to the main drive module; when the main drive module determines that the ambient temperature exceeds a preset value, it synchronously controls each IGBT to be in an off state with the slave drive module to cut off the output of the DC high - voltage ultra - high - power power supply.

[0019] Optionally, the short - circuit protection circuit further includes a heat dissipation system;

[0020] The heat dissipation system is configured to reduce the ambient temperature where the short - circuit protection circuit is located during operation.

[0021] Optionally, the main drive module includes a drive chip of model 1SP0635V, and the slave drive module includes a drive chip of model 1SP0635D.

[0022] Optionally, the number of IGBTs is 3, and the number of slave drive modules is 2.

[0023] The technical solutions provided by the embodiments of the present application may include the following beneficial effects:

[0024] In the DC high-voltage ultra-high-power IGBT short-circuit protection circuit provided by the embodiments of the present application, the main and slave drive modules are used to synchronously control multiple parallel-connected IGBTs respectively, and the output current is detected by the overcurrent detection module, so that the on and off control of the DC high-voltage ultra-high-power power supply can be realized. After abnormal conditions such as short circuit or overcurrent occur in the load, the power supply can be cut off within microseconds, solving the problem of too long response time of existing short-circuit protection devices and effectively protecting the safety of the load and related circuits. This short-circuit protection circuit can be used in various occasions such as traction and railway power supply to effectively protect electrical equipment.

[0025] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. Brief Description of the Drawings

[0026] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0027] Figure 1 It is a schematic structural diagram of a DC high-voltage ultra-high-power IGBT short-circuit protection circuit provided by an embodiment of the present application;

[0028] Figure 2 It is a schematic structural diagram of another DC high-voltage ultra-high-power IGBT short-circuit protection circuit provided by an embodiment of the present application;

[0029] Wherein: 1 - IGBT; 2 - main drive module; 3 - slave drive module; 4 - overcurrent detection module; 5 - remote control module; 6 - high-voltage isolation module; 7 - temperature detection module; 8 - heat dissipation system. Detailed Embodiments

[0030] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0031] To solve the above problems, the present application provides a DC high-voltage ultra-high-power IGBT short-circuit protection circuit to quickly turn off the load power supply when overcurrent or short circuit occurs in the load and avoid load damage. The specific implementation solution is described in detail through the following embodiments.

[0032] Embodiment

[0033] Refer to Figure 1 , Figure 1Schematic diagram of the structure of a DC high-voltage ultra-high-power IGBT short-circuit protection circuit provided by an embodiment of the present application, as Figure 1 shown. The short-circuit protection circuit includes at least the following structures:

[0034] Multiple parallel-connected IGBTs 1, a main drive module 2, at least one slave drive module 3 ( Figure 1 in this case, there are 2 slave drive modules 3) and an overcurrent detection module 4; among them,

[0035] The collectors (C poles) of multiple IGBTs 1 are connected together and used as the input end of the DC high-voltage ultra-high-power power supply; the gate (G pole) of each IGBT 1 is connected to the control signal output end of the main drive module 2 or the control signal output end of the slave drive module 3; the emitters (E poles) of multiple IGBTs 1 are connected together and used as the output end of the DC high-voltage ultra-high-power power supply for connecting to a load.

[0036] The main drive module 2 and the slave drive module 3 are connected through a parallel interface, and the main drive module 2 drives the slave drive module 3 to act synchronously after receiving a trigger signal.

[0037] The overcurrent detection module 4 is connected to the detection signal input end of the main drive module 2, and is used to detect the output current of the output end of the DC high-voltage ultra-high-power power supply and send it to the main drive module 2; when the main drive module 2 determines that the output current exceeds a preset value, it controls each IGBT 1 to be in an off state synchronously with the slave drive module 3 to cut off the output of the DC high-voltage ultra-high-power power supply.

[0038] Specifically, during normal operation, the main drive module 2 and the slave drive module 3 respectively output high levels to the gates of the corresponding IGBTs 1. At this time, multiple IGBTs 1 are all in a conducting state. Furthermore, after the DC high-voltage ultra-high-power power supply is input to the collector of the IGBT 1, it can normally output from the emitter of the IGBT 1 and supply power to the load after connecting to the load; during this period, the overcurrent detection module 4 continuously detects the current at the output end and sends it to the main drive module 2. When the load has an overcurrent or a short circuit, the current at the output end will increase significantly. When it is greater than the preset value (this preset value can be set by the user in advance according to the actual application scenario), the main drive module 2 and the slave drive module 3 change to output low levels to the gates of the IGBTs 1, so that multiple IGBTs 1 are all turned off, cutting off the power supply of the load, playing a role in short-circuit and overcurrent protection, and avoiding the load or the short-circuit protection circuit from being burned out.

[0039] Among them, only the main drive module 2 is externally connected to a power supply. The power supply provides the power required for the normal operation of the main drive module 2. Moreover, the main drive module 2 and the slave drive module 3 are connected through a parallel interface. The main drive module 2 sends a trigger signal to the slave drive module 3 and provides the power required for the normal operation of the slave drive module 3, so that the slave drive module 3 follows the main drive module 2 to synchronously operate.

[0040] In this way, the main and slave drive modules 3 are used to synchronously control multiple parallel IGBTs 1 respectively, and the output current is detected by the overcurrent detection module 4. Thus, the on and off control of the DC high-voltage extra-large power supply can be realized. After an abnormality such as a short circuit or overcurrent occurs in the load, the power supply can be cut off within a microsecond, solving the problem of too long response time of the existing short-circuit protection device, and effectively protecting the safety of the load and related circuits. This short-circuit protection circuit can be used in various occasions such as traction and railway power supply to effectively protect electrical equipment.

[0041] For better practical application, on the basis of the above solution, the embodiment of the present application also provides an improved solution, which will be described in detail below in combination with Figure 2 wherein Figure 2 is a schematic structural diagram of another DC high-voltage extra-large power IGBT 1 short-circuit protection circuit provided by the embodiment of the present application.

[0042] Figure 2 The main drive module 2 and the slave drive module 3 in are respectively implemented by driving chips with model numbers 1SP0635V and 1SP0635D. The high-level signal and low-level signal output to the gate of the IGBT can be realized by duty ratios of 100% and 0% respectively. However, it should be understood that the chip model is only exemplary, and other similar chips can also be used in practical applications. In addition, Figure 2 in the short-circuit protection circuit shown in , the number of IGBTs 1 is 3, and the number of slave drive modules 3 is 2. However, it should be noted that since both the 1SP0635V and 1SP0635D chips include 2 completely identical parallel interfaces, therefore, according to actual needs, the number of slave drive modules 3 can be 1 - 3, and the number of IGBTs 1 is 1 more than the number of slave drive modules 3.

[0043] In some embodiments, as shown in Figure 2 the short-circuit protection circuit further includes a remote control module 5 connected to the main drive module 2;

[0044] The remote control module 5 is used to send a trigger signal to the main drive module 2 based on user operations to control the working states of the main drive module 2 and the slave drive module 3. That is, the user can send a trigger signal to the main drive module 2 through the remote control module 5 to remotely control the start and stop of the protection circuit. In actual applications, the remote control module 5 can be connected to the main drive module 2 through an optical fiber.

[0045] In addition, in some embodiments, the remote control module 5 includes an alarm unit; thus, when the main drive module 2 determines that the output current exceeds a preset value, it also sends an alarm signal to the remote control module 5 to enable the alarm unit to give an alarm. The form of the alarm can be an audible and visual alarm, etc., which can be specifically set according to the actual situation and is not limited in this embodiment.

[0046] In addition, in some embodiments, the overcurrent detection module 4 includes a Hall current sensor. The Hall current sensor is a detection device based on the Hall effect. The advantage of using a Hall current sensor is that non-contact detection can be achieved, that is, there is no need to connect the overcurrent detection module 4 to the output terminal of a DC high-voltage and ultra-high-power power supply.

[0047] In addition, in some embodiments, the power input terminal of the main drive module 2 is connected to a power supply through a high-voltage isolation module 6. Considering that the voltage of the DC high-voltage and ultra-high-power power supply is very different from the voltage of the power supply for the main drive module 2, in order to avoid high-voltage interference, the high-voltage isolation module 6 is provided to isolate the high voltage.

[0048] In addition, in some embodiments, the short-circuit protection circuit further includes a temperature detection module 7 connected to the detection signal input terminal of the main drive module 2; the temperature detection module 7 is used to detect the ambient temperature where the short-circuit protection circuit is located and send the detected ambient temperature to the main drive module 2; when the main drive module 2 determines that the ambient temperature exceeds a preset value, it synchronously controls each IGBT1 to be in the off state with the slave drive module 3 to cut off the output of the DC high-voltage and ultra-high-power power supply.

[0049] Specifically, since heat is generated during the operation of the short-circuit protection circuit, in order to avoid potential safety hazards caused by overheating, the temperature detection module 7 is provided to detect the ambient temperature. When the ambient temperature is too high, the main drive module 2 and the slave drive module 3 also act synchronously to cut off the power output, thereby reducing the temperature.

[0050] In addition, in some embodiments, the short-circuit protection circuit further includes a heat dissipation system 8; which is used to reduce the ambient temperature where the short-circuit protection circuit is located during operation. Specifically, in order to accelerate heat dissipation, the heat dissipation system 8 is also provided in this embodiment. The heat dissipation system 8 can be set to be manually controlled by the user to start and stop, or can be set to be automatically controlled by the system according to the ambient temperature to start and stop.

[0051] That is, in addition to the basic overcurrent protection function, the circuits in the above embodiments further include perfect systems such as overheat protection and high-voltage isolation, thus being more capable of meeting the requirements of practical applications.

[0052] It can be understood that the same or similar parts in the above embodiments can be referred to each other, and the content not described in detail in some embodiments can be found in the same or similar content in other embodiments.

[0053] It should be noted that in the description of the present application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise specified, the meaning of "a plurality of" refers to at least two.

[0054] Any process or method description in the flowchart or described in other ways herein can be understood as representing a module, segment, or part of the code of executable instructions including one or more steps for implementing a specific logical function or process. The scope of the preferred embodiments of the present application includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in the reverse order according to the involved functions, rather than in the order shown or discussed, which should be understood by those skilled in the technical field of the embodiments of the present application.

[0055] It should be understood that each part of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following well-known technologies in the art can be used: discrete logic circuits with logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits with appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0056] Those of ordinary skill in the art of the present technology can understand that all or part of the steps carried by the methods in the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0057] In addition, each functional unit in various embodiments of the present application may be integrated into one processing module, or each unit may exist physically alone, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0058] The above-mentioned storage medium may be a read-only memory, a magnetic disk, an optical disc, or the like.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0060] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A DC high-voltage ultra-high-power IGBT short-circuit protection circuit, characterized in that, Including: Multiple parallel-connected IGBTs, one main drive module, at least one slave drive module, and one overcurrent detection module; The power input terminal of the main drive module is connected to a power supply through a high-voltage isolation module; wherein, The collectors of the multiple IGBTs are connected together as the input terminal of a DC high-voltage ultra-high-power power supply; the gate of each IGBT is connected to the control signal output terminal of the main drive module or the control signal output terminal of the slave drive module; the emitters of the multiple IGBTs are connected together as the output terminal of the DC high-voltage ultra-high-power power supply for connecting to a load; The main drive module and the slave drive module are connected through a parallel interface. The main drive module provides a working power supply to the slave drive module through the parallel interface, and the main drive module drives the slave drive module to act synchronously after receiving a trigger signal; The overcurrent detection module is connected to the detection signal input terminal of the main drive module and is used to detect the output current of the output terminal of the DC high-voltage ultra-high-power power supply and send it to the main drive module; when the main drive module determines that the output current exceeds a preset value, it synchronously controls each of the IGBTs to be in an off state with the slave drive module to cut off the output of the DC high-voltage ultra-high-power power supply.

2. The short-circuit protection circuit according to claim 1, wherein It further includes a remote control module connected to the main drive module; The remote control module is used to send a trigger signal to the main drive module based on user operations to control the working states of the main drive module and the slave drive module.

3. The short-circuit protection circuit according to claim 2, wherein, The remote control module includes an alarm unit; When the main drive module determines that the output current exceeds a preset value, it also sends an alarm signal to the remote control module to cause the alarm unit to give an alarm.

4. The short-circuit protection circuit according to claim 2, wherein The remote control module is connected to the main drive module through an optical fiber.

5. The short-circuit protection circuit according to claim 1, wherein The overcurrent detection module includes a Hall current sensor.

6. The short-circuit protection circuit according to claim 1, characterized in that, It further includes a temperature detection module connected to the detection signal input terminal of the main drive module; The temperature detection module is used to detect the ambient temperature where the short-circuit protection circuit is located and send the detected ambient temperature to the main drive module; when the main drive module determines that the ambient temperature exceeds a preset value, it synchronously controls each of the IGBTs to be in an off state with the slave drive module to cut off the output of the DC high-voltage ultra-high-power power supply.

7. The short-circuit protection circuit according to claim 1, wherein It further includes a heat dissipation system; The heat dissipation system is used to reduce the ambient temperature where the short-circuit protection circuit is located during operation.

8. The short-circuit protection circuit according to claim 1, characterized in that The main drive module includes a drive chip with the model 1SP0635V, and the slave drive module includes a drive chip with the model 1SP0635D.

9. The short-circuit protection circuit according to claim 8, characterized in that, The number of IGBTs is 3, and the number of slave drive modules is 2.

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