Plug-and-play IGBT (Insulated Gate Bipolar Translator) state monitoring module adaptive to traditional driving module

Abstract

The invention discloses a plug-and-play IGBT (Insulated Gate Bipolar Translator) state monitoring module adaptive to a traditional driving module. The plug-and-play IGBT state monitoring module comprises a logic control unit, and a quantitative judgment unit, a self-excitation short circuit unit, a junction temperature monitoring unit, a power amplification unit, a power supply unit and a signal processing unit which are electrically connected with the logic control unit respectively, the state monitoring module is movably plugged on the traditional driving module and is provided with a VCC power supply interface, a GND interface, a pulse signal input interface and a feedback signal output interface which are connected with the traditional driving module, and interfaces which are respectively and correspondingly connected with an emitting electrode, a collecting electrode and a gate electrode of the IGBT module. The plug-and-play IGBT state monitoring module adaptive to the traditional driving module can be adaptive to an original traditional driving circuit, is plug-and-play, and realizes on-line health state monitoring and management in the whole life cycle of the module on the basis of ensuring normal use of the original driving circuit, so that the reliability of a traction converter can be improved, and the service life of the traction converter is prolonged. The operation and maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of IGBT status monitoring of a key converter component, and in particular to a plug-and-play IGBT status monitoring module adapted to a traditional drive module. Background Art

[0002] In the existing technology, the application scope of power converters is becoming more and more extensive and common in the fields of aerospace, renewable energy and automobile industry. In order to improve the operating reliability of products in these fields, the industry has placed the reliability of power converters in an important position. One of the core components of the power converter is the IGBT power module. The reliability of IGBT operation is closely related to the corresponding drive circuit connected to it. Taking the field of rail transit as an example, rail transit vehicles can be divided into three categories: subway vehicles, electric locomotives and high-speed trains.

[0003] In the field of rail transit, the demand for IGBT drives is on the rise. With the increasing electrification of rails and the continuous development of other new energy fields, there is still a large demand for IGBT drive modules. IGBT modules are easily damaged in harsh operating environments and under the influence of factors such as humidity and temperature, which accelerates the aging of IGBTs and requires monitoring and evaluation of their health status. In the field of commercialization of drive circuits, there is no mature solution for health status monitoring technology integrated into drive circuits.

[0004] To address the issue of IGBT health degradation, the main current monitoring methods include IGBT life prediction methods based on failure physics. First, it is necessary to obtain the IGBT module loss based on the mission profile, establish an IGBT thermoelectric model, and then monitor appropriate parameters such as train speed and train operation diagram as data input for the model. Finally, a damage assessment is performed to determine whether the current IGBT life meets the requirements.

[0005] The above method requires the use of an external acquisition circuit to obtain a large amount of data for processing, and then build a life prediction model. The accuracy cannot be guaranteed and the process is complicated. The monitoring efficiency is low, and only offline evaluation can be achieved. It is difficult to achieve online evaluation in practical applications, and there is no mature IGBT module drive circuit solution with integrated status monitoring function in the commercial field of drive circuits. Summary of the invention

[0006] The purpose of the present invention is to provide a plug-and-play IGBT status monitoring module that is adapted to a traditional drive module. The module can be adapted to the original traditional drive circuit and is plug-and-play. On the basis of ensuring the normal use of the original drive, it can realize online health status monitoring and management of the module throughout its life cycle, thereby improving the reliability of the traction inverter and reducing operation and maintenance costs.

[0007] To achieve the above-mentioned object, the present invention provides a plug-and-play IGBT state monitoring module adapted to a traditional drive module, comprising a logic control unit and a quantization determination unit, a self-excited short-circuit unit, a junction temperature monitoring unit, a power amplification unit, a power supply unit and a signal processing unit electrically connected to the logic control unit respectively; the state monitoring module is movably plugged into the traditional drive module and is provided with a V connected to the traditional drive module. CC Power supply, GND, pulse signal input, feedback signal output interface and interfaces corresponding to the emitter, collector and gate of the IGBT module.

[0008] Preferably, the V CC The power supply, GND, pulse signal input, and feedback signal output interfaces are all connected to the traditional drive module through pin headers and female headers.

[0009] Preferably, the junction temperature monitoring unit is connected to the collector and emitter of the IGBT module.

[0010] Preferably, the self-excited short-circuit unit is connected to the collector, emitter and gate of the IGBT module.

[0011] Preferably, the power amplification unit is connected to the gate of the IGBT module.

[0012] Preferably, the logic control unit uses a CPLD chip as a processing core.

[0013] Preferably, the quantization determination unit is composed of V CE It is composed of an amplifier circuit, several comparators and a threshold setting circuit.

[0014] Preferably, during the implementation process, the priority is set by the control core in the traditional drive module to complete the determination of the current operating condition of the drive circuit, the priority of the state monitoring condition is set to be greater than the priority of the traditional drive condition, and the corresponding number of cycles is set, so that when the state monitoring module is installed on the traditional drive module, it will first enter the state monitoring condition to complete the state monitoring function, and then enter the conventional drive condition to execute the traditional drive function. The traditional drive function and state monitoring function of the drive circuit act independently on the IGBT module to complete the state monitoring, drive and protection functions of the IGBT module.

[0015] Preferably, when the state monitoring module is not connected to the traditional drive module, it enters the traditional drive condition, and the traditional drive module works normally and acts independently to realize various functions of driving the IGBT module; when the state monitoring module is connected to the traditional drive module, the control core in the traditional drive module detects the state monitoring module, and the control core determines to enter the state monitoring condition first. The drive circuit first completes junction temperature monitoring, then performs self-excited short circuit and finally completes quantitative judgment to feedback the health status of the IGBT module.

[0016] Preferably, when the status monitoring module is connected, if the logic monitoring unit detects the input of a specific frequency signal, the status monitoring module will activate the health status monitoring function, the junction temperature monitoring unit will inject a small current to collect the voltage between the collector and the emitter to determine the junction temperature, and the self-excited short-circuit unit will control the gate signal to turn on the IGBT module to generate and collect short-circuit current. At this time, the traditional drive function will not work; if the logic monitoring unit does not detect the input of a specific frequency signal, it will not affect the traditional drive circuit to perform the traditional drive function.

[0017] Therefore, the present invention adopts the above-mentioned plug-and-play IGBT status monitoring module that is adapted to the traditional drive module, which can be adapted to the original traditional drive circuit and is plug-and-play. On the basis of ensuring the normal use of the original drive, it can realize online health status monitoring and management of the module throughout its life cycle, thereby improving the reliability of the traction inverter and reducing operation and maintenance costs.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural block diagram of a plug-and-play IGBT state monitoring module adapted to a traditional drive module of the present invention;

[0020] Figure 2 It is the overall circuit connection block diagram of the present invention;

[0021] Figure 3 It is a block diagram of the stacked design of the driving circuit of the present invention;

[0022] Figure 4 It is the overall working flow diagram of the driving circuit of the present invention;

[0023] Figure 5 This is a conventional driving working condition workflow diagram of the present invention;

[0024] Figure 6 It is a working flow chart of the state monitoring working condition of the present invention. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0026] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] Example

[0028] The drive circuit of the IGBT module is closely connected to the IGBT module, and can obtain the electrical parameters of the IGBT module from the bottom layer, which can directly determine the aging status of the IGBT module. As a drive circuit that directly controls the operation of the IGBT module, it has the advantages of high scalability and complete basic functions. Therefore, using the traditional drive circuit as a carrier, an additional IGBT health status monitoring module based on electrical characteristic parameters is added to realize the integration of the plug-and-play status monitoring function module into the drive circuit, which has high executability and convenience.

[0029] The self-excited short-circuit monitoring technology will actively cause the IGBT module to short-circuit. This technology reduces the value of the short-circuit current parameter by reducing the gate voltage, and will not cause damage to the IGBT module. It collects the short-circuit current flowing through the IGBT module and compares it with the aging judgment threshold. When the current is less than the judgment threshold, it is considered that the IGBT module has aged, otherwise it is in a healthy state.

[0030] like Figure 1 As shown, the present invention provides a plug-and-play IGBT status monitoring module adapted to a traditional driving module. The plug-and-play status monitoring module combines self-excited short-circuit technology, including a logic control unit and a quantization determination unit, a self-excited short-circuit unit, a junction temperature monitoring unit, a power amplification unit, a power supply unit and a signal processing unit electrically connected to the logic control unit respectively.

[0031] Among them, the logic control unit uses CPLD chip as the processing core, which is responsible for realizing the logical judgment of various signals; the self-excited short-circuit unit includes variable gate voltage, small current source, collector-emitter voltage collection and comparison function, self-excited short-circuit power supply, and short-circuit current collection function; the junction temperature monitoring unit can judge the current temperature of the IGBT module and realize the temperature interval division function. After meeting the temperature setting requirements, the IGBT module generates self-excited short-circuit current at a lower gate voltage and collector-emitter voltage, and collects the current at the same time; the quantization judgment unit is mainly composed of V CE The amplifier circuit, multiple comparators and threshold setting circuit can convert the lower collector-emitter voltage V CE It is amplified to a level that can realize the judgment, and at the same time, key parameters such as short-circuit current and collector-emitter voltage are converted from analog to digital, and the logic control unit performs logical judgment.

[0032] The overall drive circuit design block diagram is as follows: Figure 2 As shown, the plug-and-play status monitoring module in this embodiment is easy to connect with the traditional drive module. Only one additional signal branch is added to the host computer. The IGBT module needs to be electrically connected to the traditional drive module through the connector pin and female connector, which does not affect the use of other circuits.

[0033] The plug-and-play status monitoring module in this implementation is plugged into the traditional drive module, and a total of seven external interfaces are designed, namely, V CC Power supply, GND, pulse signal input, feedback signal output interface and the interface corresponding to the emitter, collector and gate of the IGBT module. CC The power supply, GND, pulse signal input, and feedback signal output interfaces are all connected to the traditional drive module through pin and female headers.

[0034] The state monitoring module is internally provided with a power supply unit to provide power to each unit. The junction temperature monitoring unit is connected to the collector and emitter of the IGBT module to identify the junction temperature of the IGBT module and generate a junction temperature determination signal. The junction temperature monitoring unit sends the junction temperature determination signal to the logic control unit, and the logic control unit determines and controls whether the self-excited short-circuit unit is working. The self-excited short-circuit unit is connected to the collector, emitter and gate of the IGBT module, receives the signal from the logic control unit, and can realize the generation and collection of the short-circuit current of the IGBT module. The function of the state monitoring module does not include the traditional drive function, so the state monitoring module can decide whether to install it to the traditional drive module according to the needs of the user, and whether it is installed or not will not affect the normal use of the traditional drive module.

[0035] Depend on Figure 2It can be seen that the core components of the traditional drive module include the control core, over-temperature protection circuit and under-voltage protection circuit, etc., including the external power supply circuit and the signal processing circuit. The control core and the logic control unit of the status monitoring module can transmit PWM signals and real-time fault feedback signals in real time. It has power amplification, under-voltage monitoring and protection, over-temperature monitoring and protection, short-circuit monitoring and protection and digital filtering functions.

[0036] like Figure 3 As shown, the drive module designed by the present invention adopts a stacked structure, including a power board, a control board and a power board. Among them, the power board converts the external DC power supply into the voltage required for each function; the control board uses the CPLD chip as the digital core to realize various logic signal processing; the power board is directly connected to the IGBT module, including short-circuit protection, power amplification, soft shutdown and active clamping functions. The plug-and-play status monitoring module of this embodiment integrates the health status monitoring function, and is electrically connected to the other functional boards through the connector pin and female headers.

[0037] The overall working process of the driving circuit in this embodiment is as follows: Figure 4 As shown, specifically: since the user can choose whether to install the state monitoring module, the drive circuit can be divided into a traditional drive condition and a state monitoring condition. The traditional drive condition corresponds to not installing the plug-and-play state monitoring module, and the state monitoring condition corresponds to installing the plug-and-play state monitoring module. Therefore, the overall workflow needs to be divided into two conditions. After the drive circuit is connected to the power supply, each signal is initialized and the current condition is determined.

[0038] By setting the priority of the control core in the traditional drive module, the current operating condition of the drive circuit is determined, the priority of the state monitoring condition is set to be higher than the priority of the traditional drive condition, and the corresponding number of cycles is set, so that when the state monitoring module is installed on the traditional drive module, it will first enter the state monitoring condition to complete the state monitoring function, and then enter the conventional drive condition to execute the traditional drive function. The traditional drive function and state monitoring function of the drive circuit act independently on the IGBT module to complete the state monitoring, drive and protection functions of the IGBT module.

[0039] When the state monitoring module is not connected to the traditional drive module, it enters the traditional drive condition, and the traditional drive module works normally and independently to realize the various functions of driving the IGBT module. When the state monitoring module is connected to the traditional drive module, the control core in the traditional drive module detects the state monitoring module, and the control core determines to enter the state monitoring condition first. The drive circuit first completes the junction temperature monitoring, then performs the self-excited short circuit and finally completes the quantitative judgment to feedback the health status of the IGBT module.

[0040] When the status monitoring module is connected, if the logic monitoring unit detects the input of a specific frequency signal, the status monitoring module will activate the health status monitoring function, the junction temperature monitoring unit will inject a small current to collect the voltage between the collector and the emitter to determine the junction temperature, and the self-excited short-circuit unit will control the gate signal to turn on the IGBT module to generate and collect short-circuit current. At this time, the traditional drive function will not work. If the logic monitoring unit does not detect the input of a specific frequency signal, it will not affect the traditional drive circuit to perform the traditional drive function.

[0041] The specific traditional driving process is as follows: Figure 5 As shown in the figure, under the traditional driving condition, the driving circuit needs to complete the functions of digital filtering of control signals, undervoltage monitoring, overtemperature monitoring, overtemperature monitoring, short circuit monitoring, etc. When in the traditional driving condition, the driving circuit first sets the output signal PWM_OUT low, that is, the driving output -15V gate voltage locks the IGBT module. At the same time, the driver performs undervoltage monitoring on its own power supply and overtemperature monitoring. When the monitoring determines that the drive has an undervoltage fault or an overtemperature fault, the driving circuit first sets the feedback signal low, feedbacks the fault to the upper computer, and keeps the output locked. Even if the input signal is set high again, the driving circuit always keeps the -15V lock. When no fault occurs, the driving circuit determines whether the input signal is flipped. When a flip occurs, the input signal is digitally filtered to eliminate the burr signal; if the signal does not flip, the driving circuit monitors the undervoltage and overtemperature faults again. When the driving circuit determines that the current input control signal is flipped and is high, the driving circuit outputs a +15V gate signal to turn on the IGBT module and performs short circuit monitoring at the same time. When the drive circuit detects a short-circuit fault, the drive circuit first sets the feedback signal to a low level and executes the soft shutdown function to keep the IGBT module locked until it is powered on and restarted; when no short-circuit fault is detected during the IGBT module startup process, the drive circuit performs undervoltage and overtemperature monitoring again and determines the flipping of the input signal until the drive circuit is powered off to complete the entire work process.

[0042] The specific status monitoring process is as follows: Figure 6 As shown in the figure, when the drive circuit enters the state monitoring mode, the gate signal is first output to -15V to lock the IGBT module, and the collector-emitter voltage monitoring circuit VCE_down signal inside the drive circuit is used to monitor V CEMake a judgment to evaluate whether the current support capacitor is high voltage. If it is high voltage, a 200kHz signal is fed back to feedback the high voltage of the support capacitor, and the output is kept locked to end the overall process. When the support capacitor is low voltage, the precondition of the self-excited short-circuit condition is currently met, and the corresponding SC signal is set low inside the control core to shield the short-circuit protection function. After the short-circuit function is shielded, the drive circuit outputs a +15V gate signal to turn on the IGBT module, and sets Iold high at the same time, that is, the drive circuit generates a small current to monitor the current temperature of the IGBT module. The junction temperature judgment unit uses the voltage threshold comparison method to judge the temperature. When Tjup=1 and Tjdown=0, it means that the temperature at this time meets the expected setting and the next step can be taken; when the temperature meets the setting requirements, a 500kHz square wave signal is fed back to show that the temperature does not match, and the output remains locked to end the overall test process. After the set temperature is met, the drive circuit first locks the gate signal, and after a certain delay, executes the gate voltage change function and turns on the short-circuit switch MOS. At this time, the internal signal VG = 1 and M3 = 1, and the self-excited short-circuit current flows through the IGBT module. The voltage value V is obtained through the sampling resistor and the differential chip SC To reflect the short-circuit current, the pre-set aging comparison threshold Vold1-4 is used for judgment. The logic control unit feeds back the health status in the form of coding. After completing the feedback, the logic control unit turns off the self-excited short-circuit switch and locks the gate signal, ending the entire status monitoring process.

[0043] The signals in the flow chart corresponding to the two working conditions of the driving circuit are shown in Table 1.

[0044] Table 1 Signal Description Table

[0045]

[0046]

[0047] Therefore, the present invention adopts the above-mentioned plug-and-play IGBT status monitoring module that is adapted to the traditional drive module, which can be adapted to the original traditional drive circuit and is plug-and-play. On the basis of ensuring the normal use of the original drive, it can realize online health status monitoring and management of the module throughout its life cycle, thereby improving the reliability of the traction inverter and reducing operation and maintenance costs.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A plug-and-play IGBT status monitoring module adapted to a conventional driver module, characterized by: The system comprises a logic control unit and a quantization determination unit, a self-excited short-circuit unit, a junction temperature monitoring unit, a power amplification unit, a power supply unit and a signal processing unit, which are electrically connected to the logic control unit respectively; the state monitoring module is movably plugged into the traditional drive module and is provided with a V CC Power supply, GND, pulse signal input, feedback signal output interface and interfaces corresponding to the emitter, collector and gate of the IGBT module.

2. The plug-and-play IGBT status monitoring module adapted to a conventional driver module according to claim 1, characterized in that: The V CC The power supply, GND, pulse signal input, and feedback signal output interfaces are all connected to the conventional drive module via pin headers and female headers.

3. The plug-and-play IGBT status monitoring module adapted to a conventional driver module according to claim 1, characterized in that: The junction temperature monitoring unit is connected to the collector and emitter of the IGBT module.

4. The plug-and-play IGBT status monitoring module adapted to a conventional driver module according to claim 1, characterized in that: The self-excited short-circuit unit is connected to the collector, emitter and gate of the IGBT module.

5. The plug-and-play IGBT status monitoring module adapted to a conventional driver module according to claim 1, characterized in that: The power amplification unit is connected to the gate of the IGBT module.

6. The plug-and-play IGBT status monitoring module adapted to a conventional driver module according to claim 1, characterized in that: The logic control unit uses a CPLD chip as a processing core.

7. The plug-and-play IGBT status monitoring module adapted to a conventional driver module according to claim 1, characterized in that: The quantization decision unit is composed of V CE It consists of an amplifier circuit, several comparators and a threshold setting circuit.

8. The plug-and-play IGBT status monitoring module adapted to a conventional driver module according to claim 1, characterized in that: During the implementation process, the priority is set by the control core in the traditional drive module to complete the judgment of the current operating condition of the drive circuit, the priority of the status monitoring condition is set to be higher than the priority of the traditional drive condition, and the corresponding number of cycles is set, so that when the status monitoring module is installed on the traditional drive module, it will first enter the status monitoring condition to complete the status monitoring function, and then enter the conventional drive condition to execute the traditional drive function. The traditional drive function and status monitoring function of the drive circuit act independently on the IGBT module to complete the status monitoring, drive and protection functions of the IGBT module.

9. The plug-and-play IGBT status monitoring module adapted to a conventional driver module according to claim 8, characterized in that: When the status monitoring module is not connected to the traditional drive module, it enters the traditional drive condition, and the traditional drive module works normally and acts independently to realize the various functions of driving the IGBT module; when the status monitoring module is connected to the traditional drive module, the control core in the traditional drive module detects the status monitoring module, and the control core determines to enter the status monitoring condition first. The drive circuit first completes junction temperature monitoring, then performs self-excited short circuit and finally completes quantitative judgment to feedback the health status of the IGBT module.

10. The plug-and-play IGBT status monitoring module adapted to a conventional driver module according to claim 9, characterized in that: When the status monitoring module is connected, if the logic monitoring unit detects the input of a specific frequency signal, the status monitoring module will activate the health status monitoring function, the junction temperature monitoring unit will inject a small current to collect the voltage between the collector and the emitter to determine the junction temperature, and the self-excited short-circuit unit will control the gate signal to turn on the IGBT module to generate and collect short-circuit current. At this time, the traditional drive function will not work; if the logic monitoring unit does not detect the input of a specific frequency signal, it will not affect the traditional drive circuit to perform the traditional drive function.

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