Pulse tracking device for IGBT (Insulated Gate Bipolar Translator) driving signal

Abstract

The utility model provides a pulse tracking device for IGBT (Insulated Gate Bipolar Translator) driving signals, which relates to the technical field of IGBT detection and is characterized in that a detection end of a voltage detection module is respectively connected with a source electrode and a drain electrode of an IGBT module; the voltage receiving end of the detection voltage processing module is connected with the voltage output end of the voltage detection module; the signal receiving end of the pulse processing module is connected with the signal output end of the upper control system, and the signal output end of the pulse processing module is connected with the driving end of the IGBT module; the signal receiving end of the signal feedback module is connected with the voltage output end of the voltage detection module, the signal output end of the detection voltage processing module and the signal output end of the pulse processing module, and the signal output end of the signal feedback module is connected with the signal input end of the upper control system. The beneficial effects are that pulse tracking is realized so as to protect the IGBT when a short circuit fault occurs, and an upper control system provides a hardware basis for rapid fault positioning by analyzing a voltage waveform during operation.

Description

Technical Field

[0001] This utility model relates to the field of IGBT detection technology, and in particular to a pulse tracking device for IGBT drive signals. Background Technology

[0002] While existing high-capacity high-voltage frequency converters are widely used in fields such as steam turbine electrification (e.g., LNG equipment), BEST miniature generators, and compressed air energy storage equipment, their IGBT drive technology still has significant shortcomings. Although 3300V and above high-voltage IGBT modules are typically used to increase the output voltage of the power unit and reduce the number of cascaded units to enhance reliability, and multiple modules are connected in parallel to increase capacity, there is still room for improvement in IGBT drive and monitoring. Although current IGBT driver boards on the market integrate short-circuit protection, they lack the function of pulse tracking by detecting the voltage between the IGBT source and drain. This deficiency makes it impossible to effectively track the IGBT drive pulse signal, making it difficult to monitor the IGBT status in real time, thus affecting the product optimization of high-power IGBTs. Especially when an IGBT fails, the lack of operating voltage waveform data makes it difficult to quickly and accurately locate the fault, greatly increasing the difficulty of frequency converter operation and maintenance and the time required to resolve the problem. Therefore, existing IGBT drive technology has significant limitations in product optimization and fault analysis. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model provides a pulse tracking device for IGBT drive signals, comprising:

[0004] A voltage detection module, wherein the detection terminals of the voltage detection module are respectively connected to the source and drain of the IGBT module;

[0005] A voltage detection processing module, wherein the voltage receiving terminal of the voltage detection processing module is connected to the voltage output terminal of the voltage detection module;

[0006] A pulse processing module, wherein the signal receiving end of the pulse processing unit is connected to the signal output end of the upper control system, and the signal output end of the pulse processing module is connected to the driving end of the IGBT module;

[0007] The signal feedback module has its signal receiving end connected to the voltage output end of the voltage detection module, the signal output end of the detection voltage processing module, and the signal output end of the pulse processing module, respectively. The signal output end of the signal feedback module is connected to the signal input end of the upper control system.

[0008] Preferably, the voltage detection module includes:

[0009] A voltage divider unit, wherein the detection terminal of the voltage divider unit is connected to the source and drain of the IGBT module;

[0010] A surge suppression unit is provided, wherein the voltage input terminal of the surge suppression unit is connected to the voltage output terminal of the voltage divider unit, and the voltage input terminal of the surge suppression unit is connected to the voltage receiving terminal of the voltage detection and processing module.

[0011] Preferably, the voltage detection processing module includes a comparator, the voltage input terminal of which is connected to the voltage output terminal of the voltage detection module, and the signal output terminal of which is connected to the signal receiving terminal of the signal feedback module.

[0012] Preferably, the signal feedback module includes:

[0013] The fault handling unit has its signal receiving end connected to the signal output end of the pulse processing module and the signal output end of the detection voltage processing module, respectively, and its signal output end connected to the signal input end of the upper control system.

[0014] Preferably, the signal feedback module includes:

[0015] A conduction state processing unit is provided, wherein the signal receiving end of the conduction state processing unit is connected to the signal output end of the pulse processing module and the voltage output end of the voltage detection module, and the signal output end of the conduction state processing unit is connected to the signal input end of the upper control system.

[0016] Preferably, the system further includes an optical fiber module, wherein the signal input terminal of the optical fiber module is connected to the signal output terminal of the host control system and the signal output terminal of the pulse processing module, respectively, and the signal output terminal of the optical fiber module is connected to the signal input terminal of the host control system and the signal input terminal of the pulse processing module, respectively.

[0017] The above technical solution has the following advantages or beneficial effects: On the one hand, the signal feedback module can monitor the IGBT conduction status in real time and achieve pulse tracking by feeding back the IGBT conduction status to the upper control system; on the other hand, when a short circuit fault occurs in the IGBT module, the signal feedback module can transmit the fault signal to the upper control system, thereby blocking the IGBT drive signal in time. The pulse processing module cannot receive the PWM signal and cannot parse the drive signal, thus realizing software pulse blocking, thereby protecting the IGBT from damage. In addition, it can also upload the detected voltage to the upper control system, providing a hardware basis for quickly locating faults by analyzing the voltage waveform during operation. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the structure of a pulse tracking device for IGBT drive signals, which is a preferred embodiment of the present invention. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment; other embodiments that conform to the spirit of the present invention may also fall within its scope.

[0020] In a preferred embodiment of this utility model, based on the above-mentioned problems existing in the prior art, a pulse tracking system for IGBT drive signals is provided, such as... Figure 1 As shown, it includes:

[0021] Voltage detection module 1, wherein the detection terminals of voltage detection module 1 are respectively connected to the source and drain of IGBT module 2;

[0022] A voltage detection processing module 3 is provided, wherein the voltage receiving end of the voltage detection module 3 is connected to the voltage output end of the voltage detection module 1.

[0023] Pulse processing module 4, the signal receiving end of the pulse processing module 4 is connected to the signal output end of the upper control system 6, and the signal output end of the pulse processing module is connected to the driving end of the IGBT module;

[0024] The signal feedback module 7 has its signal receiving end connected to the voltage output end of the voltage detection module 1, the signal output end of the detection voltage processing module 3, and the signal output end of the pulse processing module 4, respectively. The signal output end of the signal feedback module 7 is connected to the signal input end of the upper control system 6.

[0025] Specifically, this embodiment provides a pulse tracking system for IGBT drive signals, including a voltage detection module 1 connected to the source and drain of an IGBT module 2, used to detect the voltage between the source and drain of the IGBT module 2 to obtain the detection voltage.

[0026] Voltage detection processing module 3 is connected to voltage detection module 1 and is used to output a short-circuit signal when the detected voltage is lower than the preset short-circuit voltage value.

[0027] The pulse processing module 4 is connected to the upper control system 6 and the IGBT module 2. It is used to parse the PWM signal sent by the upper control system to obtain the pulse signal to drive the IGBT module 2.

[0028] The signal feedback module 7 is connected to the voltage detection module 1, the upper control system 6, the detection voltage processing module 3 and the pulse processing module 4. It is used to obtain the conduction status signal based on the detection voltage and pulse signal, and to obtain the fault signal based on the pulse signal and short circuit signal. It then uploads the conduction status signal, the fault signal and the detection voltage to the upper control system 6.

[0029] The upper control system 6 records the conduction status signal and detection voltage in real time, and stops outputting PWM signal when a fault signal is received.

[0030] On one hand, the system feeds back the IGBT's conduction state to the upper control system 6, enabling real-time monitoring of the IGBT's conduction state and achieving pulse tracking. On the other hand, when a short-circuit fault occurs in IGBT module 2, the pulse tracking system latches the IGBT's conduction state at the time of the fault and transmits the fault signal to the upper control system 6, achieving software blocking of the PWM signal. This promptly blocks the IGBT's drive signal, and the pulse processing module 4, unable to receive the PWM signal, cannot parse the drive signal, thus achieving software pulse blocking. Furthermore, a short-circuit protection circuit can be set up, inputting the fault signal to the short-circuit protection circuit for hardware protection, thereby protecting the IGBT from damage. The upper control system 6 also receives the detected voltage and analyzes the voltage waveform during operation to quickly locate the cause of the fault.

[0031] In a preferred embodiment of this utility model, such as Figure 1 As shown, voltage detection module 1 includes:

[0032] Voltage divider unit 11, the detection terminal of the voltage divider unit 11 is connected to the source and drain of the IGBT module 1;

[0033] Surge relief unit 12, the voltage input terminal of surge relief unit 12 is connected to the voltage output terminal of voltage divider unit 11, and the voltage input terminal of surge relief unit 12 is connected to the voltage receiving terminal of voltage detection processing module 3.

[0034] Specifically, in this embodiment, the voltage divider unit 11 is connected to the source and drain of the IGBT module and is used to divide the initial voltage between the source and drain.

[0035] Surge removal unit 12 is connected to voltage divider unit 11 and is used to remove surge voltage from the initial voltage after voltage division to obtain the detection voltage.

[0036] The voltage between the source and drain of the IGBT is divided by a voltage divider unit (mainly consisting of multiple voltage divider resistors, which can be the voltage divider circuit in the existing technology), and the surge voltage is removed by a surge suppression unit (mainly consisting of capacitors, which can be the surge suppression circuit in the existing technology). This converts the high voltage unit into a measurable low voltage to obtain the detection voltage between the source and drain.

[0037] In a preferred embodiment of the present invention, the voltage detection processing module 3 includes a comparator, the voltage input terminal of the comparator is connected to the voltage output terminal of the voltage detection module 1, and the signal output terminal of the comparator is connected to the signal receiving terminal of the signal feedback module 7.

[0038] Specifically, the voltage detection processing module 3 includes a comparator connected to the voltage detection module 1, used to compare the detected voltage with the short-circuit voltage value. Under normal conditions, the detected voltage of the IGBT module should be in a state of constant alternation between high and low levels (low level when conducting and high level when turning off). However, during a short circuit, the IGBT module remains in the conducting state, and the corresponding detected voltage will remain at a low level. Therefore, the short-circuit voltage value is set to a low value. If the detected voltage obtained in real time is continuously lower than the set short-circuit power supply value, it indicates that the IGBT module has a short circuit. In the case of a short circuit, the analog signal (detected voltage) is converted into a digital signal (generally 0 / 1 representing the status), and a short-circuit signal is output when the detected voltage is lower than the preset short-circuit voltage value.

[0039] In a preferred embodiment of this utility model, such as Figure 1 As shown, the signal feedback module 7 includes:

[0040] The fault handling unit 71 has its signal receiving end connected to the signal output end of the pulse processing module 4 and the signal output end of the detection voltage processing module 3, respectively, and its signal output end connected to the signal input end of the upper control system 6.

[0041] Specifically, in this embodiment, the fault processing unit 71 is used to generate a fault signal when a pulse signal is missing or a short-circuit signal is present. The pulse signal can reflect whether the IGBT module 2 is driven normally, and the short-circuit signal obtained by the comparator in the aforementioned embodiment can also indicate whether the IGBT module is short-circuited. Therefore, the two are subjected to an "OR" logical operation in the signal feedback module. That is, a short circuit is indicated when either the pulse signal indicates a short circuit or the presence of a short-circuit signal is true. Furthermore, one is obtained through input judgment, and the other is obtained through output feedback judgment, which can improve the accuracy of short-circuit detection. The signal data processing and judgment process here can be implemented using existing software processing methods or by setting hardware logic circuits.

[0042] In a preferred embodiment of this utility model, such as Figure 1 As shown, the signal feedback module 7 includes:

[0043] The conduction state processing unit 72 has its signal receiving end connected to the signal output end of the pulse processing module 4 and the voltage output end of the voltage detection module 1, respectively, and its signal output end connected to the signal input end of the upper control system 6.

[0044] Specifically, the conduction state processing unit 72 in this embodiment is used to generate a conduction state signal indicating that the IGBT module is turned on when the pulse signal is at a high level and the detection voltage is at a low level, and to generate a conduction state signal indicating that the IGBT module is turned off when the pulse signal is at a low level and the detection voltage is at a high level.

[0045] The pulse signal is obtained by outputting a PWM signal to the upper-level control system. A high pulse signal indicates that the IGBT module is turned on, and a low pulse signal indicates that the IGBT module is turned off. Furthermore, a low voltage level indicates that the IGBT module is turned on, and a high voltage level indicates that the IGBT module is turned off. By performing logical operations on the high and low levels of the pulse signal and the detected voltage, the on / off state of the IGBT module can be accurately determined. This signal data processing and judgment process can be implemented using existing software methods or by setting up hardware logic circuits.

[0046] In a preferred embodiment of this utility model, such as Figure 1 As shown, it also includes an optical fiber module 5, the signal input terminal of which is connected to the signal output terminal of the upper control system 6 and the signal output terminal of the pulse processing module 4, respectively.

[0047] Specifically, this embodiment also includes an optical fiber module 5, which is connected between the upper control system 6 and the pulse processing module 4, and between the upper control system 6 and the signal feedback module 7. It is used to send the PWM signal output by the upper control system 6 to the pulse processing module 4, and to send the conduction status signal and fault signal output by the signal feedback module 7 to the upper control system 6.

[0048] Signals are transmitted using optical fiber to avoid external interference and provide good isolation.

[0049] In a preferred embodiment of the present invention, the signal feedback module 7 is further used to feed back the drive signal to the upper control system.

[0050] Specifically, in this embodiment, the drive signal obtained by the pulse processing module from the PWM signal is also uploaded to the upper control system. The upper control system can quickly locate the cause of the fault by analyzing the voltage waveform and corresponding drive signal during IGBT operation. Under normal circumstances, when the drive signal indicates that the IGBT module is turned on, the IGBT will be turned on and the corresponding detection voltage cannot be detected (i.e., low level). When the drive signal indicates that the IGBT module is turned off, the IGBT will be turned off and the corresponding detection voltage can be detected (i.e., high level). If the drive signal and the detection voltage are inconsistent, it indicates a fault, and the cause of the fault can be analyzed. The signal data processing and judgment process here can be implemented using existing software processing methods.

[0051] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present utility model.

Claims

1. A pulse tracking device for IGBT drive signals, characterized in that, include: A voltage detection module, wherein the detection terminals of the voltage detection module are respectively connected to the source and drain of the IGBT module; A voltage detection processing module, wherein the voltage receiving terminal of the voltage detection processing module is connected to the voltage output terminal of the voltage detection module; A pulse processing module, wherein the signal receiving end of the pulse processing module is connected to the signal output end of the upper control system, and the signal output end of the pulse processing module is connected to the driving end of the IGBT module; The signal feedback module has its signal receiving end connected to the voltage output end of the voltage detection module, the signal output end of the detection voltage processing module, and the signal output end of the pulse processing module, respectively. The signal output end of the signal feedback module is connected to the signal input end of the upper control system.

2. The pulse tracking device according to claim 1, characterized in that, The voltage detection module includes: A voltage divider unit, wherein the detection terminal of the voltage divider unit is connected to the source and drain of the IGBT module; A surge suppression unit is provided, wherein the voltage input terminal of the surge suppression unit is connected to the voltage output terminal of the voltage divider unit, and the voltage input terminal of the surge suppression unit is connected to the voltage receiving terminal of the voltage detection and processing module.

3. The pulse tracking device according to claim 1, characterized in that, The voltage detection processing module includes a comparator. The voltage input terminal of the comparator is connected to the voltage output terminal of the voltage detection module, and the signal output terminal of the comparator is connected to the signal receiving terminal of the signal feedback module.

4. The pulse tracking device according to claim 1, characterized in that, The signal feedback module includes: The fault handling unit has its signal receiving end connected to the signal output end of the pulse processing module and the signal output end of the detection voltage processing module, respectively, and its signal output end connected to the signal input end of the upper control system.

5. The pulse tracking device according to claim 1, characterized in that, The signal feedback module includes: A conduction state processing unit is provided, wherein the signal receiving end of the conduction state processing unit is connected to the signal output end of the pulse processing module and the voltage output end of the voltage detection module, and the signal output end of the conduction state processing unit is connected to the signal input end of the upper control system.

6. The pulse tracking device according to claim 1, characterized in that, It also includes an optical fiber module, the signal input end of which is connected to the signal output end of the upper control system and the signal output end of the pulse processing module, respectively.

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