Module trigger protection system applied to IGBT

Abstract

The application provides a module trigger protection system applied to an IGBT, which comprises an application control unit configured to generate a phase modulation reference voltage signal and a carrier polarity signal; a module control protection unit configured to receive the phase modulation reference voltage signal and the carrier polarity signal, and generate an IGBT control signal by using the phase modulation reference voltage signal and the carrier polarity signal; and a module device trigger unit configured to trigger the IGBT according to the IGBT control signal. According to the embodiment of the application, the fast trigger protection of the IGBT device is realized by generating the IGBT control signal in the module control protection unit.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and more specifically, to a module triggering protection system for IGBTs. Background Technology

[0002] Three-level single-phase module, such as Figure 1 As shown, it includes four IGBT units (including anti-parallel diodes for each IGBT device) and two clamping diode units. Each IGBT unit can be a single IGBT device or two or more IGBT devices connected in series. Each clamping diode unit can be a single diode device or two or more diode devices connected in series. The four IGBT units are divided into two external units and two internal units. This three-level single-phase module is used to construct power circuits for power electronic converters of various structures.

[0003] For three-level phase modules using press-fit IGBTs, independent components are used. The four IGBT units and two clamping diode units are all composed of independent press-fit IGBT devices and independent diode devices. Due to the limitations of the module's mechanical structure, the integrated trigger protection method used in modular three-level phase modules cannot be adopted.

[0004] For a three-level phase module, in the event of a module failure, to ensure the safety of each device within the module, its four IGBT units need to be turned off in a specific order: first the outer units, then the inner units. There are two existing approaches: 1) The fault information detected by the IGBT driver is sent to the application controller, which then turns off the module sequentially. However, due to the slow response speed of the application controller (microseconds), the timeliness and reliability of the triggering protection system are not high. Furthermore, during fault shutdown, since the inner and outer units are not distinguished, the IGBT driver relies on a unique technology to suppress the IGBT device fault overvoltage caused by the out-of-sequence shutdown. This can lead to the driver failing to suppress the fault overvoltage, thus posing a safety hazard to the IGBT devices. Summary of the Invention

[0005] This application aims to propose a module triggering protection system for IGBTs to solve the problem of IGBT device fault overvoltage caused by the failure to turn off IGBTs in sequence in the prior art.

[0006] According to an aspect of the present application, a module trigger protection system applied to IGBT is provided, comprising: an application control unit configured to generate a phase modulation reference voltage signal and a carrier polarity signal; a module control protection unit configured to receive the phase modulation reference voltage signal and the carrier polarity signal, and generate an IGBT control signal by using the phase modulation reference voltage signal and the carrier polarity signal; and a module device trigger unit configured to trigger the IGBT according to the IGBT control signal.

[0007] According to some embodiments, the application control unit is further configured to generate a module control protection unit start and stop signal.

[0008] According to some embodiments, the module control protection unit is further configured to select to send the IGBT control signal to the module device trigger unit or stop sending the IGBT control signal according to the module control protection unit start and stop signal.

[0009] According to some embodiments, the module device trigger unit is further configured to detect the state of the IGBT and send the state to the module control protection unit.

[0010] According to some embodiments, the module trigger protection system further comprises an IGBT unit, wherein the IGBT unit comprises at least one IGBT.

[0011] According to some embodiments, the IGBT unit comprises IGBTs of an outer unit and IGBTs of an inner unit, wherein the module control protection unit is further configured to, when detecting that the state of the IGBT is abnormal, first turn off the IGBTs of the outer unit by the module device trigger unit, and then turn off the IGBTs of the inner unit after a preset time delay.

[0012] According to some embodiments, the module device trigger unit comprises at least one device trigger subunit, and the number of device trigger subunits is the same as the number of IGBTs in the IGBT unit.

[0013] According to some embodiments, the device trigger subunit and the IGBT in the IGBT unit are in a one-to-one correspondence.

[0014] According to some embodiments, when the number of IGBTs in the IGBT unit is greater than 1, the device trigger subunit is further configured to be responsible for dynamic voltage sharing control of the corresponding IGBT.

[0015] According to some embodiments, the module control protection unit is further configured to generate a carrier signal according to the carrier polarity signal, and generate the IGBT control signal by using the phase modulation reference voltage signal and the carrier signal, and send the IGBT control signal to the module device trigger unit.

[0016] According to some embodiments, the application control unit is connected with the module control protection unit through an optical fiber; the module control protection unit is connected with the module device trigger protection unit through an optical fiber; and the module device trigger unit is connected with the IGBT unit through an electrical connection.

[0017] According to the embodiments of the present application, the IGBT device is triggered and protected quickly by generating the IGBT control signal in the module control protection unit.

[0018] According to some other embodiments, the trigger control pulse generation of the IGBT unit and the sequential turn-off in case of failure are implemented in the module control protection unit, and the turn-off sequence of the IGBT of the outer unit and the IGBT of the inner unit is controlled in the module control protection unit, so that the rapidity and reliability of the IGBT module trigger protection are improved.

[0019] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. The above and other objects, features and advantages of the present application will become more apparent through the detailed description of the example embodiments with reference to the drawings.

[0021] Figure 1 A three-level single-phase module of the prior art is shown.

[0022] Figure 2 A module trigger protection system block diagram applied to an IGBT according to an example embodiment of the present application is shown.

[0023] Figure 3 Another module trigger protection system block diagram applied to an IGBT according to an example embodiment of the present application is shown.

[0024] Figure 4 A module trigger protection system schematic diagram applied to an IGBT according to an example embodiment of the present application is shown. DETAILED DESCRIPTION

[0025] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings; however, the example embodiments can be implemented in any number of ways not necessarily depicted in the drawings. The embodiments described should not be interpreted as limiting the application. Rather, the embodiments are provided as illustrative examples so as to provide a thorough understanding of the application. Persons of ordinary skill in the art will recognize that there are numerous variations and modifications that can be made to the application as described herein.

[0026] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the application can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In these instances, well-known structures, methods, devices, materials, and so forth are described at a high-level, rather than in detail, in order to avoid obscuring aspects of the application.

[0027] The flow diagrams depicted in the accompanying drawings are merely illustrative examples, not necessarily the complete and only set of operations / steps that can be implemented in these embodiments. For example, some operations / steps can be combined or partially combined with others, and some operations / steps can be expanded into multiple operations / steps, thus possibly altering the order of certain operations / steps. All such modifications and variations are considered to be within the scope of the present application.

[0028] The terms "first", "second", "third", etc., in the specification and claims of this application and in the above description of the drawings are used to distinguish between similar objects, not to describe a particular sequential order. Moreover, the terms "include", "have", and "contain" and any variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a list of steps or elements is not limited to the listed steps or elements, but can optionally include additional steps or elements not expressly listed or inherent to such process, method, system, product, or device.

[0029] With reference to the accompanying drawings, specific embodiments according to the present application will now be described in detail.

[0030] Figure 2 A block diagram of a module trigger protection system applied to an IGBT according to an example embodiment of the present application is shown. A module trigger protection system applied to an IGBT according to an example embodiment of the present application will now be described in detail below with reference to Figure 2 as an example.

[0031] As shown in Figure 2 The module trigger protection system includes an application control unit 201, a module control protection unit 203, and a module device trigger unit 205.

[0032] According to an embodiment of the present application, the application control unit 201 is configured to generate a phase modulation reference voltage signal and a carrier polarity signal; the module control protection unit 203 is configured to receive the phase modulation reference voltage signal and the carrier polarity signal, and generate an IGBT control signal using the phase modulation reference voltage signal and the carrier polarity signal; and the module device triggering unit 205 is configured to trigger the IGBT according to the IGBT control signal.

[0033] In some other embodiments, the module control protection unit 203 first generates a carrier signal according to the carrier polarity signal, and generates the IGBT control signal using the phase modulation reference voltage signal and the carrier signal, and sends the IGBT control signal to the module device triggering unit 205.

[0034] According to some embodiments, the application control unit is further configured to generate a module control protection unit start and stop signal, and the module control protection unit 203 selects to send the IGBT control signal to the module device triggering unit 205 or stop sending the IGBT control signal according to the module control protection unit start and stop signal.

[0035] According to Figure 2 As shown in the embodiment, the module control protection unit generates the IGBT control signal, so that the IGBT device is triggered and protected quickly.

[0036] Figure 3 Another application control unit 201, module control protection unit 203 and module device triggering unit 205 are shown in the embodiment of the module triggering protection system for IGBT according to an example embodiment of the present application, as shown in the figure. Figure 3 The module triggering protection system shown in the figure includes the IGBT unit 207 in addition to the application control unit 201, the module control protection unit 203 and the module device triggering unit 205. The IGBT unit 207 includes at least one IGBT.

[0037] According to an embodiment of the present application, the IGBT unit 207 includes IGBTs of an outer unit and IGBTs of an inner unit.

[0038] In some embodiments, the module device triggering unit 205 is further configured to detect the state of the IGBT in the IGBT unit 207, and send the state to the module control protection unit 203. When the module control protection unit 203 detects that the state of the IGBT is abnormal, the module control protection unit 203 first turns off the IGBT of the outer unit through the module device triggering unit 205, and then turns off the IGBT of the inner unit after a preset time delay.

[0039] In a specific embodiment, the module device triggering unit 205 includes at least one device triggering subunit, and the number of device triggering subunits is the same as the number of IGBTs in the IGBT unit. In some embodiments, the device triggering subunits and the IGBTs in the IGBT unit have a one-to-one correspondence. When the number of IGBTs in the IGBT unit is greater than 1, the device triggering subunit is responsible for the dynamic voltage equalization control of the corresponding IGBT.

[0040] In some specific embodiments, the application control unit 201 is connected to the module control and protection unit 203 via optical fiber, the module control and protection unit 203 is connected to the module device trigger protection unit 205 via optical fiber, and the module device trigger unit 205 is electrically connected to the IGBT unit 207.

[0041] according to Figure 3 The embodiment shown improves the speed and reliability of IGBT module trigger protection by generating the trigger control pulse of the IGBT unit and sequentially shutting it off in case of a fault within the module control and protection unit. Furthermore, the module control and protection unit controls the sequential shutdown order of the IGBTs in the outer unit and the IGBTs in the inner unit.

[0042] Figure 4 A schematic diagram of a module triggering protection system applied to an IGBT according to an example embodiment of this application is shown. Figure 4 The module trigger protection system shown includes an application control unit, a module control and protection unit, a module device trigger unit, and an IGBT unit.

[0043] like Figure 4 As shown, the module device triggering unit includes four device triggering modules. The number of connection ports of the device triggering modules is the same as that of the IGBTs in the IGBT unit, and each device triggering module is connected in series with an IGBT. The module device triggering unit is used to trigger the four IGBT units and detect faults.

[0044] exist Figure 4 In the embodiment shown, the application control unit and the module control and protection unit are connected by optical fiber, the module control and protection unit and the module device triggering and protection unit are connected by optical fiber, and the device triggering module in the module device triggering unit is electrically connected to the IGBT in the IGBT unit.

[0045] In a specific embodiment, the application control unit generates a phase modulation reference voltage signal, a carrier polarity signal, and start and stop signals for the module control and protection unit, transmitting them to the module control and protection unit at microsecond intervals. The module control and protection unit generates a carrier signal with nanosecond intervals based on the received carrier polarity signal, and uses the overlap of the reference voltage signal and the carrier signal to generate control pulse signals for each IGBT unit, sending them to the module device triggering unit. Based on the received start or stop signal, the module control and protection unit selects to send control pulses to the module device triggering unit or stops sending control pulse signals. When the module device triggering and protection unit receives a stop control pulse signal, it first turns off the IGBTs of two external units, delaying for t seconds. d After a certain time, turn off the IGBTs of the two inner units.

[0046] The module device triggering unit is used to trigger and detect faults in the four IGBT units, and sends the detected status to the module control and protection unit. The module control and protection unit receives normal or abnormal IGBT unit signals from the module device triggering unit. When an abnormal signal is received, it first shuts down the IGBT of the external unit, and then delays for a period of t. d The IGBT in the internal cell is turned off after a certain time. For example, the delay time t. d ≥0.5*t d(off) , t d(off) This is the nominal value for the turn-off time of the IGBT device.

[0047] like Figure 4 The module device triggering unit includes four device triggering modules. Each device triggering module is responsible for triggering the IGBT in the corresponding IGBT unit, detecting the normal or abnormal state of the IGBT in the IGBT unit, and sending the status information to the module control and protection unit. When the number of IGBTs in the IGBT unit is greater than 1, the device triggering module is also responsible for the dynamic voltage equalization control of the IGBTs connected in series in this unit.

[0048] according to Figure 4 The embodiment shown achieves nanosecond-level trigger control pulse generation and sequential shutdown in case of fault. By using a delay, the sequential shutdown order of the external and internal units is ensured, improving the speed and reliability of IGBT module trigger protection.

[0049] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. Furthermore, any changes or modifications made by those skilled in the art based on the ideas of this application, and on the specific implementation methods and application scope of this application, are all within the scope of protection of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A module triggering protection system applied to IGBTs, characterized in that, include: The application control unit is configured to generate a phase modulation reference voltage signal and a carrier polarity signal; The module control and protection unit is configured to receive the phase modulation reference voltage signal and the carrier polarity signal, and generate an IGBT control signal using the phase modulation reference voltage signal and the carrier polarity signal. as well as A module device triggering unit is configured to trigger the IGBT according to the IGBT control signal; IGBT unit, the IGBT unit includes an outer unit IGBT and an inner unit IGBT; The module device triggering unit includes at least one device triggering subunit. The number of device triggering subunits is the same as the number of IGBTs in the IGBT unit, and the device triggering subunits and the IGBTs in the IGBT unit have a one-to-one correspondence. The module control and protection unit is further configured to, when an abnormal state of the IGBT is detected, first turn off the IGBT of the outer unit through the module device triggering unit, and then turn off the IGBT of the inner unit after a preset delay.

2. The module triggering protection system according to claim 1, characterized in that, The application control unit is also configured to generate start and stop signals for the module control and protection unit.

3. The module triggering protection system according to claim 2, characterized in that, The module control and protection unit is further configured to select whether to send the IGBT control signal to the module device triggering unit or stop sending the IGBT control signal based on the start and stop signals of the module control and protection unit.

4. The module triggering protection system according to claim 1, characterized in that, The module device triggering unit is also configured to detect the state of the IGBT and send the state to the module control and protection unit.

5. The module triggering protection system according to claim 4, characterized in that, The IGBT unit includes at least one IGBT.

6. The module triggering protection system according to claim 1, characterized in that, When the number of IGBTs in the IGBT unit is greater than 1, the device trigger subunit is also configured to be responsible for the dynamic voltage equalization control of the corresponding IGBT.

7. The module triggering protection system according to claim 1, characterized in that, The module control and protection unit is further configured to generate a carrier signal based on the carrier polarity signal, generate the IGBT control signal using the phase modulation reference voltage signal and the carrier signal, and send the IGBT control signal to the module device trigger unit.

8. The module triggering protection system according to claim 5, characterized in that: The application control unit and the module control and protection unit are connected via optical fiber; The module control protection unit and the module device trigger protection unit are connected via optical fiber; The module device triggering unit is electrically connected to the IGBT unit.

Images