High-voltage switch tube drive signal testing device and method

Abstract

The present invention is applicable to the field of high-voltage signal detection technology and provides a high-voltage switching tube drive signal testing device. The device includes a measurement module; the measurement module is used to collect the high-voltage switching tube drive signal and convert it into an optical signal for transmission to the outside; the measurement module is detachably fixedly mounted within a high-voltage electrical module device box and connected to the high-voltage switching tube. Due to its small size and the lack of space required, the measurement module can be directly mounted on the high-voltage switching tube and convert the drive signal into an optical signal for output. This allows testing during normal operation without opening the metal device box, effectively ensuring test safety. Furthermore, optical signal transmission is not subject to electromagnetic interference and exhibits minimal attenuation, ensuring signal distortion even during long-distance measurements, effectively ensuring test accuracy.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-voltage signal detection, and in particular relates to a device and method for testing a high-voltage switch tube drive signal. Background Art

[0002] High-voltage IGBTs and high-voltage MOSFETs are indispensable electronic components in the field of high-voltage, high-current power transmission and conversion. During product development and testing, it's necessary to measure the normal operation of the drive signals for high-voltage switching transistors. However, high-voltage switching transistors typically operate at voltages of hundreds or even thousands of volts, posing significant measurement challenges and potential safety risks.

[0003] High-voltage power modules are typically installed in metal enclosures. When testing these modules (including the resonant charging power supply (RC), solid-state switching power supply (SSS), and solid-state switching and pulse boost power supply (SSPB)), if the high-voltage switching transistors within them need to be tested, one method is to use a low-voltage probe to measure the drive signal under low voltage conditions. However, this method does not reflect the operating status of the device and switching transistors under actual high-voltage conditions.

[0004] Another method involves opening the metal device box after applying high voltage to the device and testing the high-voltage switching transistors using a high-voltage differential probe. However, to ensure the functionality of the entire high-voltage module, sufficient insulation strength must be ensured between the switching transistor under test and the probe; otherwise, a dangerous situation can easily occur. Furthermore, unboxing the tester will not guarantee accuracy and will affect safety. Furthermore, high-voltage differential probes are generally large, making them inconvenient for test layout. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a high-voltage switch tube drive signal testing device and method.

[0006] In the present invention, when testing the high-voltage switch tube drive signal, the measurement module is directly fastened to the high-voltage switch tube without affecting the test accuracy. No other support is required and no space is occupied. In addition, there is no need to open the metal device box during testing, which effectively ensures safety during testing.

[0007] In a first aspect, the present invention provides a high-voltage switch tube drive signal test device, the device comprising a measurement module for collecting the drive signal of the high-voltage switch tube, converting it into an optical signal and transmitting it to the outside;

[0008] The measuring module is detachably fixedly mounted in the high-voltage electric module device box and is connected to the high-voltage switch tube.

[0009] Preferably, the device further comprises: an optical fiber and a signal analysis module;

[0010] The measuring module transmits the optical signal to the signal analyzing module through the optical fiber to test the driving signal of the high-voltage switch tube.

[0011] Preferably, the measuring module comprises a current limiting resistor and an optical fiber transmitter head connected to each other; the measuring module is inserted into the gate and emitter of the high-voltage switch tube;

[0012] The optical fiber transmitter is used to convert the electrical drive signal output by the high-voltage switch tube into an optical signal and transmit it to the optical fiber;

[0013] The input end of the optical fiber transmitter is connected to the emitter of the high-voltage switch tube, and the output end is connected to the input end of the optical fiber;

[0014] The current limiting resistor is connected to the grid of the high-voltage switch tube and the optical fiber transmitting head respectively.

[0015] Preferably, the signal analysis module includes:

[0016] An optical signal acquisition module is used to analyze the optical signal output by the measurement module and convert it into an electrical signal that can be collected;

[0017] The optical signal acquisition module is connected to the measurement module via an optical fiber.

[0018] Preferably, the signal analysis module further includes: a signal display module;

[0019] The signal display module is connected to the optical signal acquisition module and is used to display the electrical signal output by the optical signal acquisition module.

[0020] Preferably, the optical signal acquisition module includes:

[0021] Fiber optic receiving head, used to convert the optical signal output by the measurement module into an electrical signal;

[0022] The analog signal amplifying circuit is used to amplify the electrical signal converted by the optical fiber receiving head to obtain an amplified electrical signal;

[0023] BNC connector, used to transmit the amplified electrical signal to the signal display module;

[0024] The optical fiber receiving head is connected to the output end of the optical fiber;

[0025] The analog signal amplifying circuit is connected to the optical fiber receiving head and the BNC connector respectively;

[0026] The output end of the BNC connector is connected to the signal display module.

[0027] Preferably, the optical signal acquisition module further includes:

[0028] The power supply system is connected to the optical fiber receiving head and the analog signal amplifying circuit respectively, and is used to supply power to the optical fiber receiving head and the analog signal amplifying circuit respectively.

[0029] In a second aspect, the present invention provides a method for testing a high-voltage switch tube drive signal, the method comprising:

[0030] The measurement module collects the driving signal of the high-voltage switch tube and converts it into an optical signal;

[0031] The optical fiber transmits the optical signal to the signal analysis module;

[0032] The signal analysis module performs data analysis on the optical signal to test the driving signal of the high-voltage switch tube.

[0033] Preferably, the step of the measuring module collecting the driving signal of the high-voltage switch tube and converting it into an optical signal includes:

[0034] The measurement module collects the driving signal between the gate and emitter of the high-voltage switching tube;

[0035] The optical fiber transmitter in the measuring module converts the collected driving signal into an optical signal.

[0036] Preferably, the step of the signal analysis module performing data analysis on the optical signal to test the driving signal of the high-voltage switch tube includes:

[0037] The optical fiber receiving head in the signal analysis module receives the optical signal and converts the optical signal into an electrical signal;

[0038] The analog signal amplifying circuit of the signal analysis module amplifies the electrical signal to obtain an amplified electrical signal;

[0039] The BNC connector of the signal analysis module sends the amplified electrical signal to the signal display module of the signal analysis module;

[0040] The signal display module displays the collectible electrical signal;

[0041] The signal display module determines whether the driving signal of the high-voltage switch tube has reached a preset threshold.

[0042] In the high-voltage switch tube drive signal test device shown in the present invention, the measurement module is small and does not need to occupy too much space. The measurement module can be directly installed on the high-voltage switch tube and converts the drive signal into an optical signal for output. There is no need to open the metal device box and the test can be performed during normal operation, effectively ensuring the safety of the test. In addition, the optical signal transmission is not subject to electromagnetic interference and the attenuation of the optical transmission itself is small. The signal can still be guaranteed not to be distorted during long-distance measurement, effectively ensuring the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 This is a structural diagram of a high-voltage switch tube drive signal testing device according to a first embodiment of the present invention.

[0045] Figure 2 This is another structural schematic diagram of the high-voltage switch tube drive signal testing device according to the first embodiment of the present invention.

[0046] Figure 3 It is a structural diagram of the measurement module 1 in the high-voltage switch tube drive signal testing device according to the first embodiment of the present invention.

[0047] Figure 4 1 is a schematic diagram of the structure of the signal analysis module 3 in the high-voltage switch tube drive signal test device according to the first embodiment of the present invention.

[0048] Figure 5 1 is a schematic structural diagram of the optical signal acquisition module 31 in the high-voltage switch tube drive signal testing device according to the first embodiment of the present invention.

[0049] Figure 6 It is a flow chart of a method for testing a high-voltage switch tube drive signal according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0051] The following describes the specific implementation of the present invention in detail with reference to specific embodiments:

[0052] Example 1:

[0053] As attached Figure 1As shown, the high-voltage switch tube drive signal test device provided in this embodiment includes a measuring module 1, which is used to collect the drive signal of the high-voltage switch tube 0 and convert it into an optical signal and send it to the outside; the measuring module 1 is detachably fixedly installed in the high-voltage electric module device box and is connected to the high-voltage switch tube 0.

[0054] Because measurement module 1 is mounted directly on high-voltage switching tube 0, its shape and size match those of high-voltage switching tube 0. Due to its small size, measurement module 1 does not occupy excessive space. Furthermore, by converting the drive signal into an optical signal for output, testing can be performed during normal operation without opening the metal device box, effectively ensuring test safety. Furthermore, optical signal transmission is immune to electromagnetic interference and exhibits minimal attenuation, ensuring signal distortion even during long-distance measurements and ensuring test accuracy.

[0055] Specifically, such as Figure 2 As shown, the high-voltage switch tube drive signal test device also includes an optical fiber 2 and a signal analysis module 3; the measurement module 1 transmits the optical signal to the signal analysis module 3 through the optical fiber 2 to test the drive signal of the high-voltage switch tube 0.

[0056] Because optical fiber 2 is thin and soft, only a very small gap is needed to lead the optical fiber out. When optical fiber 2 transmits signals, there is no need to open the metal device box and the test can be carried out during normal operation. Moreover, the insulation strength of the optical fiber is infinite, which effectively ensures the safety of the test. In addition, the optical signal will basically not attenuate in the optical fiber. After using this device, the signal can still be guaranteed not to be distorted during long-distance measurement, effectively ensuring the accuracy of the test.

[0057] Specifically, as attached Figure 3 As shown, the measurement module 1 includes a current-limiting resistor 11 and an optical fiber transmitter 12, which are interconnected. The optical fiber transmitter 12 is used to convert the electrical drive signal output by the high-voltage switching tube 0 into an optical signal and transmit it to the optical fiber 2. The input end of the optical fiber transmitter 12 is connected to the emitter of the high-voltage switching tube 0, and the output end is connected to the input end of the optical fiber 2. The current-limiting resistor 11 is connected to the gate of the high-voltage switching tube 0 and the optical fiber transmitter 12 respectively. Therefore, the optical fiber transmitter 12 can collect the drive signal of the high-voltage switching tube, convert the drive signal into an optical signal, and then transmit it through the optical fiber 2.

[0058] Specifically, the measurement module is inserted into the gate G and the emitter E of the high-voltage switch tube 0 , thereby collecting and measuring the voltage signal between the gate G and the emitter E of the high-voltage switch tube 0 .

[0059] Specifically, as attached Figure 4As shown, the signal analysis module 3 includes an optical signal acquisition module 31 and a signal display module 32. The optical signal acquisition module 31 is connected to the measurement module 1 via the optical fiber 2. The optical signal acquisition module 31 is used to analyze the optical signal output by the measurement module 1 and convert it into a collectible electrical signal. The signal display module 32 is connected to the optical signal acquisition module 31 and displays the electrical signal after receiving the electrical signal transmitted by the optical signal acquisition module 31.

[0060] Specifically, the signal display module 32 is an oscilloscope, which is used to display the signal after the optical signal acquisition module 31 performs signal analysis.

[0061] Further, as attached Figure 5 As shown, the optical signal acquisition module 31 includes an optical fiber receiving head 312, an analog signal amplification circuit 313, and a BNC connector 314. The optical fiber receiving head 312 is connected to the output end of the optical fiber; the analog signal amplification circuit 313 is respectively connected to the optical fiber receiving head 312 and the BNC connector 314; and the output end of the BNC connector 314 is connected to the signal display module 32. The optical fiber receiving head 312 is used to convert the optical signal output by the measurement module 1 into an electrical signal; the analog signal amplification circuit 313 is used to amplify the electrical signal converted by the optical fiber receiving head 312 to obtain an amplified electrical signal; and the BNC connector 314 is used to transmit the amplified electrical signal to the signal display module 32.

[0062] Optionally, the optical signal acquisition module 31 further includes a power supply system 311 , which is connected to the optical fiber receiving head 312 and the analog signal amplifying circuit 313 , respectively, for supplying power to the optical fiber receiving head 312 and the analog signal amplifying circuit 313 .

[0063] It should be noted that the optical signal acquisition module 31 may also include other types of interfaces to adapt to the signal display module of the corresponding interface.

[0064] In this embodiment, the high-voltage switch transistor 0 includes an IGBT and a MOSFET. The IGBT drive signal characteristic is that, while the absolute voltage of the gate (G) drive signal can reach thousands of volts, the relative voltage of the gate (G) relative to the emitter (E) is only ±20V at most. Similar to the IGBT, the absolute voltage of the MOSFET drive signal gate (G) can be very high, but the relative voltage relative to the source (S) is also a maximum of ±20V.

[0065] Taking advantage of this characteristic, a measurement module 1 is added between the gate G and emitter E of the high-voltage switching tube 0. This module consists solely of a current-limiting resistor 11 and a fiber optic transmitter 12, and its function is to convert the drive signal into an optical signal. Measurement module 1 is connected to an optical fiber 2, which transmits the optical signal to the subsequent stage. In the subsequent stage, an optical signal acquisition module 31 is installed, which converts the optical signal into an electrical signal and transmits it via a coaxial cable to an acquisition device such as an oscilloscope 32 for collection.

[0066] In this embodiment, the measurement module 1 is compact and lightweight, allowing it to be directly fastened to any type of switch under test without requiring any support or occupying any space. Furthermore, optical fiber is used for signal transmission, providing infinite insulation strength, thus eliminating safety concerns during measurement. The small size of the measurement module 1 and the thin and flexible optical fiber 2 allow the device to perform measurements during normal operation. Once the device is installed in the housing, only a small gap is required to lead the optical fiber out. Optical signal attenuation in the optical fiber 2 is minimal, enabling long-distance measurements while maintaining signal integrity.

[0067] Example 2:

[0068] As attached Figure 6 As shown, the second embodiment shows a flow chart of a method for testing a high-voltage switch tube drive signal, the method comprising:

[0069] Step S110: The measuring module collects the driving signal of the high-voltage switching tube and converts it into an optical signal.

[0070] In step S120 , the optical fiber transmits the optical signal to the signal analysis module.

[0071] In step S130 , the signal analysis module performs data analysis on the optical signal to test the driving signal of the high-voltage switch tube.

[0072] Specifically, when implementing step S110, the measuring module collects the driving signal between the gate and the emitter in the high-voltage switch tube, and then converts the collected driving signal into an optical signal through the optical fiber transmitter head in the measuring module.

[0073] Specifically, when implementing step S130, the optical fiber receiving head in the signal analysis module receives the optical signal and converts the optical signal into an electrical signal, the analog signal amplification circuit in the signal analysis module amplifies the electrical signal to obtain an amplified electrical signal, and the BNC connector of the signal analysis module sends the amplified electrical signal to the signal display module of the signal analysis module; the signal display module displays the collectible electrical signal; and the signal display module determines whether the driving signal of the high-voltage switch tube reaches a preset threshold, and detects the driving signal of the high-voltage switch tube.

[0074] In this embodiment, the preset threshold is ±20V.

[0075] It should be understood that the specific order or hierarchy of steps in the disclosed processes is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0076] In the foregoing detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that embodiments of the claimed subject matter require more features than are expressly recited in each claim. On the contrary, as reflected in the appended claims, the invention comprises less than all the features of any individual disclosed embodiment. The appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0077] The above description of the disclosed embodiments is intended to enable any person skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments presented herein but is intended to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0078] The foregoing description includes examples of one or more embodiments. Of course, it is not possible to describe all possible combinations of components or methods for the purposes of describing the above embodiments, but one of ordinary skill in the art will recognize that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to encompass all such changes, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent the term "comprising" is used in the specification or claims, the term is intended to be encompassed in a manner similar to the term "including," as explained in terms of "including," used as a transitional word in the claims. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or."

[0079] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-voltage switch tube drive signal testing device, characterized in that: include: A measuring module (1) is used to collect the driving signal of the high-voltage switch tube (0), convert it into an optical signal and send it to the outside; The measuring module (1) is detachably fixedly mounted in a high-voltage electric module device box and is connected to the high-voltage switch tube (0); and an optical fiber (2); wherein: The measuring module (1) comprises a current-limiting resistor (11) and an optical fiber transmitter (12) connected to each other; the measuring module (1) is inserted into the gate and emitter of the high-voltage switch tube (0); The optical fiber transmitting head (12) is used to convert the electrical drive signal output by the high-voltage switch tube (0) into an optical signal and transmit it to the optical fiber (2); The input end of the optical fiber transmitter (12) is connected to the emitter of the high-voltage switch tube (0), and the output end is connected to the input end of the optical fiber (2); The current-limiting resistor (11) is respectively connected to the grid of the high-voltage switch tube (0) and the optical fiber transmitter head (12).

2. The device according to claim 1, wherein Also included: a signal analysis module (3); The measuring module (1) transmits the optical signal to the signal analysis module (3) via the optical fiber (2) to test the driving signal of the high-voltage switch tube (0).

3. The device according to claim 1, wherein Also included: a signal analysis module (3); The signal analysis module (3) comprises: An optical signal acquisition module (31) is used to analyze the optical signal output by the measurement module (1) and convert it into an electrical signal that can be collected; The optical signal acquisition module (31) is connected to the measurement module (1) via an optical fiber (2).

4. The device according to claim 3, characterized in that The signal analysis module (3) further includes: a signal display module (32); The signal display module (32) is connected to the optical signal acquisition module (31) and is used to display the electrical signal output by the optical signal acquisition module (31).

5. The device according to claim 3, wherein The optical signal acquisition module (31) comprises: An optical fiber receiving head (312) is used to convert the optical signal output by the measuring module (1) into an electrical signal; An analog signal amplifying circuit (313) is used to amplify the electrical signal converted by the optical fiber receiving head (312) to obtain an amplified electrical signal; A BNC connector (314) for transmitting the amplified electrical signal to a signal display module (32); The optical fiber receiving head (312) is connected to the output end of the optical fiber; The analog signal amplifying circuit (313) is connected to the optical fiber receiving head (312) and the BNC connector (314) respectively; The output end of the BNC connector (314) is connected to the signal display module (32).

6. The device according to claim 5, characterized in that The optical signal acquisition module (31) further comprises: The power supply system (311) is connected to the optical fiber receiving head (312) and the analog signal amplifying circuit (313) respectively, and is used to supply power to the optical fiber receiving head (312) and the analog signal amplifying circuit (313) respectively.

7. A method for testing a high-voltage switch tube drive signal using the high-voltage switch tube drive signal testing device according to claim 1, characterized in that: The method comprises: The measurement module collects the driving signal of the high-voltage switch tube and converts it into an optical signal; The optical fiber transmits the optical signal to the signal analysis module; The signal analysis module performs data analysis on the optical signal to test the driving signal of the high-voltage switch tube.

8. The method according to claim 7, wherein The step of the measuring module collecting the driving signal of the high-voltage switch tube and converting it into an optical signal includes: The measurement module collects the driving signal between the gate and emitter of the high-voltage switching tube; The optical fiber transmitter in the measuring module converts the collected driving signal into an optical signal.

9. The method according to claim 7, wherein The signal analysis module performs data analysis on the optical signal to test the driving signal of the high-voltage switch tube, including: The optical fiber receiving head in the signal analysis module receives the optical signal and converts the optical signal into an electrical signal; The analog signal amplifying circuit of the signal analysis module amplifies the electrical signal to obtain an amplified electrical signal; The BNC connector of the signal analysis module sends the amplified electrical signal to the signal display module of the signal analysis module; The signal display module displays the collectible electrical signal; The signal display module determines whether the driving signal of the high-voltage switch tube has reached a preset threshold.

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