Pulse generating device for testing power device

Abstract

The invention provides a pulse generating device for testing a power device, which relates to the technical field of pulse generating devices, and comprises a power supply module, a control module, a communication module, a control module, a display module, a pulse synthesis module and a pulse amplification module, and the synthesized pulse signal parameter and the pulse mode are directly input to the control module through the control module or transmitted to the control module through the communication module. The control module calculates first and second pulse signal parameters and a synthesis parameter, generates a first path of pulse signals and a second path of pulse signals respectively according to the first and second pulse signal parameters, the synthesis parameter and a pulse mode and first and second timers in the control module, and converts the first and second pulse signals into a first pulse signal and a second pulse signal through the pulse synthesis module. And the synthesized pulse signal is subjected to signal amplification and shaping through the pulse amplification module.

Description

Technical Field

[0001] The invention relates to the technical field of pulse generating devices, in particular to a pulse generating device for testing power devices. Background Art

[0002] In the field of power semiconductor device testing, the performance parameters of semiconductor devices can usually be evaluated through single pulse, double pulse, and multi-pulse tests. In addition, the design of the drive circuit and the design of the power circuit of the power device can also be optimized and verified through the above tests. Therefore, the accuracy of the pulse signal will greatly affect the test results. At the same time, a large amount of repeated verification and pulse parameter adjustment are often required during the test process, and waveform data and image collection are also required during the test. Therefore, the generation of pulse signals, parameter modification, and the simplicity of waveform data and image collection also greatly affect the efficiency of the test. The above application scenarios put forward high requirements on the repeatability of pulse signals, amplitude smoothness, edge steepness, pulse width accuracy, parameter adjustment convenience, intuitive display, and remote online function. Therefore, a special pulse generator is required to generate pulse signals.

[0003] The traditional commonly used methods are: 1. Use a signal generator instrument, which can output arbitrary waveforms with high precision and intuitive display, but is large in size and expensive; 2. Use a 555-like oscillation circuit to obtain a time reference, supplemented by logic gates and analog circuits to obtain a pulse signal, but the circuit is complex, the signal is not intuitive, and it is difficult to achieve remote online operation.

[0004] The above information disclosed in the Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may include information that does not constitute the prior art that is already known to one of ordinary skill in the art. Summary of the invention

[0005] The object of the present invention is to provide a pulse generating device for testing a power device to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A pulse generating device for testing a power device, comprising: A power supply module, the power supply module comprising a power input terminal, a control power terminal and a drive power terminal, the power input terminal being electrically connected to an external AC power grid and used to rectify the AC power of the AC power grid into DC power, the control power terminal being electrically connected to the control module and used to provide a control power supply, and the drive power terminal being electrically connected to a display module and a pulse amplification module and used to provide a drive power supply; A control module, which is electrically connected to the control module and is used to set the required synthetic pulse signal parameters and pulse mode and send them to the control module; A control module, wherein the control module is used to calculate the first and second pulse signal parameters and the synthesis parameters after extracting the synthesis pulse signal parameters and the pulse mode, and generate the first and second pulse signals respectively according to the first and second pulse signal parameters, the synthesis parameters and the pulse mode and the first and second timers inside the control module; A pulse synthesis module, which is electrically connected to the control module and is used to combine the first and second pulse signals generated by the control module into a synthesized pulse signal; A pulse amplification module, wherein the pulse amplification module includes an amplification circuit and a shaping circuit. The amplification circuit is electrically connected to the pulse synthesis module and is used to amplify the synthesized pulse signal after being merged by the pulse synthesis module. The shaping circuit is electrically connected to the amplification circuit and is used to shape the pulse signal amplified by the amplification circuit.

[0007] Furthermore, it also includes a communication module and a display module, the communication module is electrically connected to the control module and the manipulation module, the control module and the manipulation module transmit data through the communication module, and is used to receive control instructions such as synthetic pulse signal parameters and pulse modes, and send them to the control module, the display module is electrically connected to the control module and the pulse synthesis module, and is used to display the first and second pulse signal waveforms, as well as the synthesized synthetic pulse signal waveform; Furthermore, the control power supply terminal provides a 3.3 volt control power supply, and the drive power supply terminal provides a 5 volt drive power supply.

[0008] Furthermore, the synthesized pulse signal parameters include the synthesized pulse width and the synthesized pulse interval time of each pulse; The pulse modes include a single pulse mode, a double pulse mode and a continuous pulse mode.

[0009] Furthermore, the specific steps of calculating the first and second pulse signal parameters and synthesis parameters are: The first and second pulse signal parameters include each pulse width and pulse occurrence time in the first and second pulse signals; When the pulse generating device is in single pulse mode; In the single pulse mode, the number of synthesized pulse signals is one pulse signal, the synthesized pulse width is the pulse width of the first pulse signal, and the synthesized pulse interval time is not set; When the pulse generating device is in dual pulse mode; The number of synthesized pulse signals in the dual pulse mode is two pulse signals, the first pulse signal in the synthesized pulse signal is generated by the first pulse signal, the synthesized pulse width of the first pulse signal in the synthesized pulse signal is the pulse width of the first pulse signal, the second pulse signal in the synthesized pulse signal is generated by the second pulse signal, and the synthesized pulse width of the second pulse signal in the synthesized pulse signal is the pulse width of the second pulse signal; The calculation method of the synthesis parameters is: in, is the synthesis parameter, is the pulse width of the first pulse signal in the synthetic pulse signal, is the synthetic pulse interval time; Calculate the time when the second pulse signal occurs by synthesizing the parameters: in, is the time when the second pulse signal in the synthetic pulse signal occurs, is the time when the first pulse signal in the synthetic pulse signal occurs, is the synthesis parameter; When the pulse generating device is in continuous pulse mode; The number of the synthesized pulse signals in the continuous pulse mode is more than two pulse signals, the first pulse signal in the synthesized pulse signal is generated by the first pulse signal, and the synthesized pulse width of the first pulse signal in the synthesized pulse signal is the pulse width of the first pulse signal; The second and subsequent pulse signals in the synthesized pulse signal are generated by the second pulse signal, and the synthesized pulse width of the second and subsequent pulse signals in the synthesized pulse signal is the pulse width of the pulse signal in the second pulse signal; The calculation method of the synthesis parameters is: in, The number of pulse signals is The synthesis parameters of is the pulse width of the first synthetic pulse signal, For the The synthetic pulse interval time, For the The synthesized pulse width, is a positive integer, ; By calculating the synthesis parameters The time when the synthetic pulse signal occurs: in, For the The moment when the synthetic pulse signal occurs, is the time when the first synthetic pulse signal occurs, For the Synthesis parameters of a synthetic pulse signal; The calculation formula for the time when the rising edge of the first and second pulse signals is generated is: in, is the moment when the rising edge of the first pulse signal occurs. is the moment when the rising edge of the second pulse signal occurs. is the number of pulse signals, Is a positive integer.

[0010] Furthermore, the specific method of combining the first and second pulse signals generated by the control module into a synthetic pulse signal is: Of the two pulse signals generated by the control module, as long as any one of the signals is at a high level, the final output signal is also at a high level after passing through the pulse synthesis module; only when both pulse signals are at a low level, the final output signal is at a low level after passing through the pulse synthesis module. When the two pulse signals are both at a high level, after passing through the pulse synthesis module, the two pulse high-level signals are synthesized into one signal for output.

[0011] Further, the amplifier circuit is used to amplify the pulse voltage of the synthesized pulse signal to 5 volts; The shaping circuit is a Schmidt circuit, which is used to shorten the rising time of the rising edge and the falling time of the falling edge of the synthetic pulse signal.

[0012] Compared with the prior art, the beneficial effect of the present invention is that the synthesized pulse signal parameters and pulse mode are directly input to the control module through the control module or transmitted through the communication module. The control module calculates the first and second pulse signal parameters and the synthesis parameters, and generates the first and second pulse signals respectively according to the first and second pulse signal parameters, the synthesis parameters and the pulse mode, and the first and second timers inside the control module, and the first and second pulse signals are combined into a synthesized pulse signal through the pulse synthesis module, and then the signal is amplified and shaped through the pulse amplification module; The present invention generates a first pulse signal and a second pulse signal respectively through a first timer and a second timer inside a control module, and combines the first pulse signal and the second pulse signal into a synthesized pulse signal through a pulse synthesis module. Since the pulse parameters of the two pulse signals are set by two pulses, the pulse widths of the two pulses can be freely adjusted, and the pulse interval time can be effectively shortened. Meanwhile, the accuracy of the pulse interval time is improved, and the limitation on the pulse interval time due to the hardware of the control module is reduced. Since the two pulse signals are output separately, two signal capture points can be drawn out on each of the two pulse signals, so that the oscilloscope can expand the waveform of the important observation point when the rising edge or the falling edge of any one of the pulses is triggered, and the comparative analysis of multiple test waveforms under the same time axis setting is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the pulse device system of the present invention; Figure 2 This is a schematic diagram of the two-way pulse signal output structure of the control module of the present invention; Figure 3 A schematic diagram of the pulse synthesis module of the present invention being combined into a synthetic pulse signal; Figure 4 It is a schematic diagram of the pulse width and pulse interval time of two pulses of the present invention; Figure 5 This is a schematic diagram of the principle of the control module of the present invention generating two pulse signals; Figure 6 A schematic diagram of important observation points of the pulse signal of the present invention; Figure 7 It is a display schematic diagram of observing important observation points in a pulse signal in an oscilloscope according to the present invention; Figure 8 It is a schematic diagram of the screen display of observing the overflow of important observation points in a pulse signal in an oscilloscope according to the present invention; Fig. 9 The present invention is a schematic diagram of the positions of two signal capture points derived from two pulse signals; Fig.10 The present invention is a schematic diagram of drawing two signal capture points from two pulse signals in an oscilloscope to observe important observation points; Fig.11 It is a schematic diagram of observing important observation points when the pulse width changes when two signal capture points are drawn out from two pulse signals in an oscilloscope according to the present invention; Fig.12 It is a schematic diagram of the principle of combining two pulse signals under different pulse modes of the present invention. DETAILED DESCRIPTION

[0014] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0015] It should be noted that, 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.

[0016] Example

[0017] See also Figure 1 , the present invention provides a technical solution: A pulse generating device for power device testing includes a power module, a control module, a communication module, a control module, a display module, a pulse synthesis module and a pulse amplification module, wherein: The power module adopts a DC step-down module of model LM2596s, including a power input terminal, a control power terminal and a drive power terminal. The power input terminal is electrically connected to the external AC power grid and is used to rectify the AC power of the AC power grid into DC power. The control power terminal is electrically connected to the control module and is used to provide control power. The drive power terminal is electrically connected to the display module and the pulse amplification module and is used to provide drive power. In this embodiment, the control power supply terminal provides a 3.3 volt control power supply to the control module; The driving power supply terminal provides 5V driving power supply for the display module and the pulse amplification module.

[0018] The control module is electrically connected to the control module. The control module uses a micro-switch button of model TOUGLESY to set the required synthetic pulse signal parameters and pulse mode and send them to the control module.

[0019] In this embodiment, the synthetic pulse signal parameters include the synthetic pulse width and synthetic pulse interval time of each pulse; The pulse modes include a single pulse mode, a double pulse mode and a continuous pulse mode.

[0020] The communication module is electrically connected to the control module and the manipulation module, and adopts a communication module of model TELESKY-485. The control module and the manipulation module transmit data through the communication module, which is used to receive control instructions such as synthetic pulse signal parameters and pulse modes, and send them to the control module.

[0021] In this embodiment, the communication module is an RS485 communication interface.

[0022] RS485 is a differential signal communication method that can effectively resist electromagnetic interference and noise, which is particularly important in the test environment of power devices because these environments are usually full of interference generated by various high voltages and currents. Due to the simple structure of the RS485 interface, it is easy to implement and maintain. Compared with other high-speed or more complex communication interfaces, the equipment and maintenance costs of the RS485 interface are relatively low.

[0023] The control module is used to calculate the first and second pulse signal parameters and synthesis parameters after extracting the synthetic pulse signal parameters and the pulse mode, and generate the first and second pulse signals respectively according to the first and second pulse signal parameters, synthesis parameters and pulse mode and the first and second timers inside the control module.

[0024] The control module uses a single-chip microcomputer with an ARM Cotrex-M3 core. The chip contains multiple timer modules that can directly save the setting parameters. It has a high cost-effectiveness and an operating frequency of tens of MHz or higher. The output pulse width adjustment step accuracy is close to 10ns, which can meet the needs of most power device pulse tests.

[0025] In this embodiment, the specific steps of calculating the first and second pulse signal parameters and the synthesis parameters are: The first and second pulse signal parameters include each pulse width and pulse occurrence time in the first and second pulse signals; When the pulse generating device is in single pulse mode; In the single pulse mode, the number of synthesized pulse signals is one pulse signal, the synthesized pulse width is the pulse width of the first pulse signal, and the synthesized pulse interval time is not set; The single pulse mode is a pulse signal sent by the pulse generator. The single pulse test can help measure the switching characteristics, steady-state and transient electrical parameters of the device, such as breakdown voltage and off-state leakage current. This test is mainly used to evaluate the performance of the device in a single moment. In the single pulse mode, after the microcontroller outputs the first pulse, it does not need to output the second pulse, nor does it need to consider the synthetic pulse interval time.

[0026] When the pulse generating device is in dual pulse mode; The number of synthesized pulse signals in the dual pulse mode is two pulse signals, the first pulse signal in the synthesized pulse signal is generated by the first pulse signal, the synthesized pulse width of the first pulse signal in the synthesized pulse signal is the pulse width of the first pulse signal, the second pulse signal in the synthesized pulse signal is generated by the second pulse signal, and the synthesized pulse width of the second pulse signal in the synthesized pulse signal is the pulse width of the second pulse signal; The calculation method of the synthesis parameters is: in, is the synthesis parameter, is the pulse width of the first pulse signal in the synthetic pulse signal, is the synthetic pulse interval time; Calculate the time when the second pulse signal occurs by synthesizing the parameters: in, is the time when the second pulse signal in the synthetic pulse signal occurs, is the time when the first pulse signal in the synthetic pulse signal occurs, is the synthesis parameter; The double pulse mode can simulate the switching operation of the device in actual applications, such as in power electronic converters. Double pulse testing helps to evaluate the thermal stability and reliability of the device under repeated switching loads, and can also be used to analyze the dynamic characteristics of the device, such as switching loss, on-resistance change, etc.

[0027] When the pulse generating device is in continuous pulse mode; The number of the synthesized pulse signals in the continuous pulse mode is more than two pulse signals, the first pulse signal in the synthesized pulse signal is generated by the first pulse signal, and the synthesized pulse width of the first pulse signal in the synthesized pulse signal is the pulse width of the first pulse signal; The second and subsequent pulse signals in the synthesized pulse signal are generated by the second pulse signal, and the synthesized pulse width of the second and subsequent pulse signals in the synthesized pulse signal is the pulse width of the pulse signal in the second pulse signal; The calculation method of the synthesis parameters is: in, The number of pulse signals is The synthesis parameters of is the pulse width of the first synthetic pulse signal, For the The synthetic pulse interval time, For the The synthesized pulse width, is a positive integer, ; By calculating the synthesis parameters The time when the synthetic pulse signal occurs: in, For the The moment when the synthetic pulse signal occurs, is the time when the first synthetic pulse signal occurs, For the Synthesis parameters of a synthetic pulse signal; The calculation formula for the time when the rising edge of the first and second pulse signals is generated is: in, is the moment when the rising edge of the first pulse signal occurs. is the moment when the rising edge of the second pulse signal occurs. is the number of pulse signals, Is a positive integer.

[0028] By applying multiple pulses to a device, its behavior in complex or extreme working environments can be more fully simulated. Multi-pulse testing helps analyze the durability and thermal behavior of devices in long-term operation, especially in high-power and high-frequency application scenarios such as automotive and industrial electronics. This test can reveal the degree of degradation and failure mode of devices after continuous load.

[0029] The display module is electrically connected to the control module and the pulse synthesis module, and adopts a liquid crystal display screen with model number DMT48270C043_04WNZ0, which is used to display the first and second pulse signal waveforms, and the synthesized pulse signal waveform after synthesis.

[0030] The pulse synthesis module is electrically connected to the control module. The pulse synthesis module adopts an OR gate circuit to combine the first and second pulse signals generated by the control module into a synthesized pulse signal.

[0031] In this embodiment, the specific method of combining the first and second pulse signals generated by the control module into a synthetic pulse signal is as follows: Of the two pulse signals generated by the control module, as long as any one of the signals is at a high level, the final output signal is also at a high level after passing through the pulse synthesis module; only when both pulse signals are at a low level, the final output signal is at a low level after passing through the pulse synthesis module. When the two pulse signals are both at a high level, after passing through the pulse synthesis module, the two pulse high-level signals are synthesized into one signal for output.

[0032] See also Figure 3-4Taking the dual pulse mode as an example, the pulse synthesis module can synthesize the two pulse signals generated by the control module into one signal, which can effectively shorten the pulse interval between the pulse signals and improve the flexibility of pulse waveform modulation. At the same time, since the two pulse signals are set by two pulses, the pulse width of the two pulses can be freely adjusted.

[0033] If the pulse signal is generated by only one timer of the control module in one pulse signal output, the control module needs to reset the internal timer in this very short interval after outputting the first pulse to adjust the pulse width of the second pulse. Because the microcontroller adjustment setting of the control module itself requires a certain running time, in order to ensure the running time of the microcontroller, the interval time cannot be set to a very small value (for example, less than 2us), thereby limiting the time parameter range of the pulse output of the device and limiting the scope of application of the device.

[0034] See also Figure 5 The present invention uses two timers in a single chip to output two pulse signals respectively, one of which is set to the pulse width t1 of the first pulse signal, and the other is set to the pulse interval time t2 and the pulse width t3 of the second pulse signal, and then the two timers are started to run and output pulses.

[0035] After running, one of the timers 1 outputs the first pulse (t1), and then another timer 2 is started. After the pulse interval (t2), the second pulse (t3) is immediately output. It can be seen that the microcontroller first sets the time parameters of the timer, and then there is no need to intervene or reset it. The timer can be run to output pulses, so the pulse interval time is very small and can be accurately output. Therefore, the pulse interval time output by this device can be set to a very small time value (such as 50ns), ensuring practicality.

[0036] See also Figure 6 Taking the double pulse mode as an example, in the pulse test of power semiconductor devices, special attention should be paid to the waveform of the power device at the moment of on and off under high voltage and high current, which occurs at the rising and falling edges of the second pulse. Testers often want to use the rising or falling edge as the trigger moment of the oscilloscope to keep the start time of the oscilloscope consistent when collecting data under different load current conditions, so as to facilitate testers to directly observe and compare the waveforms of the device's on and off characteristics.

[0037] See also Figure 7-8, because the oscilloscope screen can usually only capture the rising edge or falling edge of the first pulse, once the waveform at the important observation point needs to be expanded, or the pulse width time t1 changes, the important observation point will be shifted as a whole, and in some cases, the waveform will move out of the screen. Even every time a test is performed, the tester needs to constantly adjust the oscilloscope screen to observe and collect the expanded waveform at the important observation point, which brings inconvenience to the test.

[0038] Moreover, the observation and acquisition of waveforms at important observation points require repeated comparison and analysis. If the rising or falling edge of the second pulse can be captured, the time position of the important observation point remains unchanged, and multiple waveform comparison and analysis can be performed under the same time axis setting. However, an oscilloscope can usually only capture the rising or falling edge of the first pulse, and the time position of the important observation point will often change, so it is impossible to compare and analyze multiple waveforms under the same time axis setting. Once the waveform width changes, the waveform position needs to be readjusted and aligned, which seriously affects work efficiency.

[0039] See also Figure 9-11 The above problems bring great inconvenience and a lot of time consumption to the tester. In this device, due to the separate output of two pulse signals, two signal capture points can be drawn on the circuit. In this way, when tracking the edge of any pulse signal, the starting position of the waveform displayed on the oscilloscope screen will no longer change and will not be affected by other factors. When it is necessary to track the rising edge or falling edge (important observation point) of the second pulse, the waveform at this point will always be displayed at the same position of the oscilloscope without adjustment, which brings great convenience and greatly improves the efficiency of waveform observation, collection, comparison and analysis.

[0040] The pulse amplification module is electrically connected to the pulse synthesis module, and comprises an amplification circuit and a shaping circuit, which are used to amplify and shape the synthesized pulse signal after being combined by the pulse synthesis module.

[0041] In this embodiment, the amplifier circuit is used to amplify the pulse voltage of the synthetic pulse signal to 5 volts; The shaping circuit is a Schmidt circuit, which is used to shorten the rising time of the rising edge and the falling time of the falling edge of the pulse signal.

[0042] The pulse signal generated by the single-chip microcomputer is output through the pin. Due to its limited amplitude, the output power is also very small, the driving ability is poor, and it is easy to be damaged. This device adds a shaping amplifier circuit to convert the output pulse into a universal 5V level output, which not only avoids the direct output of the single-chip microcomputer port and protects the single-chip microcomputer port, but also ensures sufficient output power and level amplitude. The pulse signal is shaped by the Schmitt circuit to enhance the edge of the pulse signal, making it more obvious and sharp, and making the upper and lower edges of the pulse waveform steeper. Such steep upper and lower edges help electronic equipment to more accurately and quickly identify the starting and ending points of the signal, reduce the ambiguity and cross misjudgment of the signal, and improve the stability and reliability of the entire system.

[0043] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0044] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented by software, the above embodiments may be implemented in whole or in part in the form of a computer program product. Those skilled in the art may appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein may be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed by hardware or software methods depends on the specific application and design constraints of the technical solution.

[0045] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0046] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A pulse generating device for power device testing, characterized in that: include: A power supply module, the power supply module comprising a power input terminal, a control power terminal and a drive power terminal, the power input terminal being electrically connected to an external AC power grid and used to rectify the AC power of the AC power grid into DC power, the control power terminal being electrically connected to the control module and used to provide a control power supply, and the drive power terminal being electrically connected to a display module and a pulse amplification module and used to provide a drive power supply; A control module, which is electrically connected to the control module and is used to set the required synthetic pulse signal parameters and pulse mode and send them to the control module; A control module, wherein the control module is used to calculate the first and second pulse signal parameters and the synthesis parameters after extracting the synthesis pulse signal parameters and the pulse mode, and generate the first and second pulse signals respectively according to the first and second pulse signal parameters, the synthesis parameters and the pulse mode and the first and second timers inside the control module; A pulse synthesis module, which is electrically connected to the control module and is used to combine the first and second pulse signals generated by the control module into a synthesized pulse signal; A pulse amplification module, wherein the pulse amplification module includes an amplification circuit and a shaping circuit. The amplification circuit is electrically connected to the pulse synthesis module and is used to amplify the synthesized pulse signal after being merged by the pulse synthesis module. The shaping circuit is electrically connected to the amplification circuit and is used to shape the pulse signal amplified by the amplification circuit.

2. A pulse generating device for power device testing according to claim 1, characterized in that: It also includes a communication module and a display module. The communication module is electrically connected to the control module and the manipulation module. The control module and the manipulation module transmit data through the communication module. The module is used to receive control instructions such as synthetic pulse signal parameters and pulse modes, and send them to the control module. The display module is electrically connected to the control module and the pulse synthesis module, and is used to display the first and second pulse signal waveforms, as well as the synthesized synthetic pulse signal waveform.

3. A pulse generating device for power device testing according to claim 1, characterized in that: The control power supply terminal provides a 3.3 volt control power supply, and the drive power supply terminal provides a 5 volt drive power supply.

4. A pulse generating device for power device testing according to claim 1, characterized in that: The synthetic pulse signal parameters include the synthetic pulse width of each pulse and the synthetic pulse interval time; The pulse modes include a single pulse mode, a double pulse mode and a continuous pulse mode.

5. A pulse generating device for power device testing according to claim 4, characterized in that: The specific steps of calculating the first and second pulse signal parameters and the synthesis parameters are: The first and second pulse signal parameters include each pulse width and pulse occurrence time in the first and second pulse signals; When the pulse generating device is in single pulse mode; In the single pulse mode, the number of synthesized pulse signals is one pulse signal, the synthesized pulse width is the pulse width of the first pulse signal, and the synthesized pulse interval time is not set; When the pulse generating device is in dual pulse mode; The number of synthesized pulse signals in the dual pulse mode is two pulse signals, the first pulse signal in the synthesized pulse signal is generated by the first pulse signal, the synthesized pulse width of the first pulse signal in the synthesized pulse signal is the pulse width of the first pulse signal, the second pulse signal in the synthesized pulse signal is generated by the second pulse signal, and the synthesized pulse width of the second pulse signal in the synthesized pulse signal is the pulse width of the second pulse signal; The calculation method of the synthesis parameters is: in, is the synthesis parameter, is the pulse width of the first pulse signal in the synthetic pulse signal, is the synthetic pulse interval time; Calculate the time when the second pulse signal occurs by synthesizing the parameters: in, is the time when the second pulse signal in the synthetic pulse signal occurs, is the time when the first pulse signal in the synthetic pulse signal occurs, is the synthesis parameter; When the pulse generating device is in continuous pulse mode; The number of the synthesized pulse signals in the continuous pulse mode is more than two pulse signals, the first pulse signal in the synthesized pulse signal is generated by the first pulse signal, and the synthesized pulse width of the first pulse signal in the synthesized pulse signal is the pulse width of the first pulse signal; The second and subsequent pulse signals in the synthesized pulse signal are generated by the second pulse signal, and the synthesized pulse width of the second and subsequent pulse signals in the synthesized pulse signal is the pulse width of the pulse signal in the second pulse signal; The generation time of each pulse signal is calculated according to the synthesis parameters; The calculation method of the synthesis parameters is: in, The number of pulse signals is The synthesis parameters of is the pulse width of the first synthetic pulse signal, For the The synthetic pulse interval time, For the The synthesized pulse width, is a positive integer, ; By calculating the synthesis parameters The time when a pulse signal occurs: in, For the The moment when the synthetic pulse signal occurs, is the time when the first synthetic pulse signal occurs, For the Synthesis parameters of a synthetic pulse signal; The calculation formula for the time when the rising edge of the first and second pulse signals is generated is: in, is the moment when the rising edge of the first pulse signal occurs. is the moment when the rising edge of the second pulse signal occurs. is the number of pulse signals, Is a positive integer.

6. A pulse generating device for power device testing according to claim 1, characterized in that: The specific method of combining the first and second pulse signals generated by the control module into a synthetic pulse signal is as follows: Of the two pulse signals generated by the control module, as long as any one of the signals is at a high level, the final output signal is also at a high level after passing through the pulse synthesis module; only when both pulse signals are at a low level, the final output signal is at a low level after passing through the pulse synthesis module. When the two pulse signals are both at a high level, after passing through the pulse synthesis module, the two pulse high-level signals are synthesized into one signal for output.

7. A pulse generating device for power device testing according to claim 1, characterized in that: The amplifier circuit is used to amplify the pulse voltage of the synthetic pulse signal to 5 volts; The shaping circuit is a Schmidt circuit, which is used to shorten the rising time of the rising edge and the falling time of the falling edge of the synthetic pulse signal.

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