Signal sampling circuit, method and equipment of power device and medium

Abstract

According to the signal sampling circuit, method and equipment of the power device and the medium provided by the embodiment of the invention, a control module outputs a first control signal to a first driving module and outputs a first sampling synchronization signal to a first measurement module; the first driving module drives the first power device to be switched on or switched off according to the first control signal; the first measurement module collects a current signal of the first power device in the turn-on or turn-off process of the first power device according to the first sampling synchronization signal, transmits a voltage signal of the first power device, and determines the loss of the first power device according to the voltage signal and the current signal. And outputting the digital voltage signal, the digital current signal and the digital loss of the first power device. Therefore, accurate signal measurement in the turn-on and turn-off processes of the power device is realized.

Description

Technical Field

[0001] This invention relates to the field of device signal technology and related technical fields, specifically to a signal sampling circuit, method, device, and medium suitable for a power device. Background Technology

[0002] With the widespread adoption of electrification in industries such as photovoltaic power generation, electric vehicles, and data centers, power electronic converter technology has developed rapidly. The core unit used in these industries is the power converter, which performs functions such as AC-to-DC and DC-to-DC conversion. Power converters require high power density, ultra-high efficiency output, and operation in harsh high-temperature environments. Next-generation wide-bandgap (WBG) semiconductors, with their high voltage withstand capability, fast switching speed, and high-temperature resistance, are particularly suitable for new electronic converter applications. Today, electric vehicles, photovoltaic inverters, and AI data power centers are increasingly using new power devices such as silicon carbide (SiC) and gallium nitride (GaN) as core components to meet increasingly demanding application requirements. The use of SiC power devices can reduce inverter power losses, improve efficiency, and reduce energy consumption; however, the high-speed switching also brings many technical challenges in engineering applications. One particularly challenging task is accurately measuring the actual voltage (current) change waveform from 0V(A) to 1000V(A) within ten nanoseconds. However, in the process of developing and researching power inverters, obtaining accurate and true waveforms of power devices is crucial for studying switching losses, parasitic first inductance and capacitance in the power circuit, gate drive performance, device voltage and current stress margin, and electromagnetic compatibility level.

[0003] In existing technologies, the high-voltage DS signal of the device under test (DUT) is typically input to a high-voltage probe via a probe extension line. The probe then attenuates the acquired signal to a low-voltage analog signal, which is then isolated and input to an oscilloscope for sampling. The oscilloscope displays the measured high-voltage signal waveform using an algorithm. However, the DUT signal travels through long links and multiple conversion stages to the oscilloscope, and parasitic inductance on the lines can cause waveform oscillations, leading to inaccurate testing. High-voltage probes also suffer from reduced input bandwidth and impedance under high voltage, making accurate measurement of high-voltage high-frequency signals difficult. Furthermore, the sampling rate cannot be increased for rapidly changing signals. Using high-bandwidth optically isolated probes is expensive and complex. In short, when measuring the switching waveforms of wide-bandgap power devices such as silicon carbide (SiC) and gallium nitride (GaN), these methods suffer from inaccurate measurements, inconvenient implementation, and high costs.

[0004] Therefore, there is an urgent need to propose a signal sampling circuit for power devices to solve the problems existing in the current technology. Summary of the Invention

[0005] The embodiments described herein provide a signal sampling circuit, method, apparatus, and medium for a power device, addressing problems existing in the prior art.

[0006] In a first aspect, according to the present disclosure, a signal sampling circuit for a power device is provided for acquiring the dynamic waveform of a power device in a power device switching circuit. The power device switching circuit includes a first power device, a second power device, a first inductor, and a first capacitor. The drain terminal of the first power device is electrically connected to the first terminal of the first capacitor. The source terminal of the first power device is electrically connected to the drain terminal of the second power device and the first terminal of the first inductor, respectively. The source terminal of the second power device and the second terminal of the first inductor are electrically connected to the second terminal of the first capacitor, respectively. The circuit includes a control module, a first drive module, and a first measurement module. The control module is configured to output a first control signal to the first drive module and to output a first sampling synchronization signal to the first measurement module; The first driving module is configured to drive the first power device to turn on or off according to the first control signal; The first measurement module is configured to acquire the current signal of the first power device during the turn-on or turn-off process of the first power device according to the first sampling synchronization signal, transmit the voltage signal of the first power device, determine the loss of the first power device according to the voltage signal and the current signal, and output the digital voltage signal, digital current signal and digital loss of the first power device.

[0007] In some embodiments of this disclosure, the first measurement module includes a first measurement unit, a second measurement unit, and a third measurement unit; The first measurement unit is configured to receive the first sampling synchronization signal, acquire the current signal of the first power device at the rising edge of the first sampling synchronization signal, and convert the current signal into a digital current signal; The second measurement unit is configured to receive the first sampling synchronization signal, transmit the voltage signal of the first power device on the rising edge of the first sampling synchronization signal, and convert the current signal into a digital current signal; The third measurement unit is configured to receive the first sampling synchronization signal, determine the loss of the first power device based on the current signal and the voltage signal at the rising edge of the first sampling synchronization signal, and convert the loss into digital loss.

[0008] In some embodiments of this disclosure, the first measurement unit includes a Hall sensor, a first amplifier, and a first analog-to-digital converter; the second measurement unit includes a high-frequency connector, a first resistor, a second resistor, a second capacitor, a second amplifier, and a second analog-to-digital converter; and the third measurement unit includes a multiplier and a third analog-to-digital converter. The Hall sensor is connected in series between the drain terminal of the first power device and the first terminal of the first capacitor. The first terminal of the first amplifier receives the current signal of the first power device acquired by the Hall sensor. The second terminal of the first amplifier is electrically connected to the first terminal of the first analog-to-digital converter and the first terminal of the multiplier, respectively. The second terminal of the first analog-to-digital converter outputs a digital current signal. The high-frequency connector is connected in parallel between the drain terminal and the source terminal of the first power device. The first terminal of the first resistor receives the voltage signal of the first power device transmitted by the high-frequency connector. The second terminal of the first resistor is electrically connected to the first terminal of the second resistor and the first terminal of the second capacitor, respectively. The second terminal of the second resistor and the second terminal of the second capacitor are electrically connected to the first terminal of the second amplifier, respectively. The second terminal of the second amplifier is electrically connected to the first terminal of the second analog-to-digital converter and the second terminal of the multiplier, respectively. The second terminal of the second analog-to-digital converter outputs a digital voltage signal. The third terminal of the multiplier is electrically connected to the first terminal of the third analog-to-digital converter. The second terminal of the third analog-to-digital converter outputs a digital loss.

[0009] In some embodiments of this disclosure, a main control module is also included; The main control module is configured to generate a first control signal, output the first control signal to the control module, receive the digital voltage signal, digital current signal and digital loss of the first power device output by the first measurement module, and generate the dynamic waveform of the first power device during the turn-on and turn-off process based on the digital voltage signal, digital current signal and digital loss.

[0010] In some embodiments of this disclosure, the main control module communicates with the first measurement module via an optically isolated high-speed communication module.

[0011] In some embodiments of this disclosure, the first measurement module is integrated on the first driving module, and the measurement circuit corresponding to the first measurement module and the driving circuit corresponding to the first driving module are integrally configured.

[0012] In some embodiments of this disclosure, the power device switching circuit further includes a single-pole double-throw switch and a second inductor. The first terminal of the single-pole double-throw switch is electrically connected to the source terminal of the first power device and the drain terminal of the second power device, respectively. The second terminal of the single-pole double-throw switch is electrically connected to the first terminal of the second inductor. The third terminal of the single-pole double-throw switch is electrically connected to the first terminal of the first inductor. The control terminal of the single-pole double-throw switch receives a third control signal output by the control module. The signal sampling circuit of the power device further includes a second driving module and a second measurement module; The control module is further configured to output a second control signal to the second drive module and to output a second sampling synchronization signal to the second measurement module; The second drive module is configured to drive the second power device to turn on or off according to the second control signal; The second measurement module is configured to acquire the current signal of the second power device during the turn-on or turn-off process of the second power device according to the second sampling synchronization signal, transmit the voltage signal of the second power device, determine the loss of the second power device according to the voltage signal and the current signal, and output the digital voltage signal, digital current signal and digital loss of the second power device.

[0013] Secondly, according to the present disclosure, a signal sampling method for a power device is provided for acquiring the dynamic waveform of a power device in a power device switching circuit. The power device switching circuit includes a first power device, a second power device, a first inductor, and a first capacitor. The drain terminal of the first power device is electrically connected to a first terminal of the first capacitor. The source terminal of the first power device is electrically connected to the drain terminal of the second power device and a first terminal of the first inductor, respectively. The source terminal of the second power device and a second terminal of the first inductor are electrically connected to a second terminal of the first capacitor, respectively. The method includes: Output the first control signal and the first sampling synchronization signal; According to the first control signal, drive the first power device to turn on or off; Based on the first sampling synchronization signal, the current signal of the first power device is acquired during the turn-on or turn-off process of the first power device, the voltage signal of the first power device is transmitted, and the loss of the first power device is determined based on the voltage signal and the current signal, and the digital voltage signal, digital current signal and digital loss of the first power device are output.

[0014] Thirdly, according to this disclosure, a computer device is provided, comprising: One or more processors; Storage device for storing one or more programs. When the one or more programs are executed by the one or more processors, the one or more processors perform the method as described in any of the second aspects.

[0015] Fourthly, according to this disclosure, a computer-readable storage medium is provided having a computer program stored thereon that, when executed by a processor, implements the method described in any of the second aspects.

[0016] The power device signal sampling circuit, method, device, and medium provided in this disclosure include a control module that outputs a first control signal to a first drive module and outputs a first sampling synchronization signal to a first measurement module; the first drive module drives the first power device to turn on or off according to the first control signal; the first measurement module collects the current signal of the first power device and transmits the voltage signal of the first power device during the turn-on or turn-off process according to the first sampling synchronization signal, determines the loss of the first power device based on the voltage signal and the current signal, and outputs the digital voltage signal, digital current signal, and digital loss of the first power device. This embodiment of the invention includes an additional first measurement module. This first measurement module directly acquires the current signal and transmits the voltage signal of the power device during its operation. It then determines the power consumption based on the voltage and current signals. The first measurement module accurately measures the signals during the power device's on and off processes. Compared to the prior art, which uses probe extension lines (i.e., long leads) to acquire the voltage and current signals of the power device, this avoids the inaccuracy of the tested power device signals caused by parasitic inductance on the line. Furthermore, in the signal sampling circuit of the power device provided in this embodiment, a first sampling synchronization signal is output to the first measurement module simultaneously with the first control signal output by the control module to the first drive module. This allows the first measurement module to synchronously determine the voltage, current, and power loss of the first power device during its on or off processes. The accuracy of data acquisition can be improved through the first sampling synchronization signal.

[0017] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. It should be understood that the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure, wherein: Figure 1 This is a schematic diagram of the structure of a signal sampling circuit for a power device provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of the signal sampling circuit of another power device provided in an embodiment of this disclosure; Figure 3 This is a schematic diagram of the signal waveform of a power device during the conduction process provided in an embodiment of this disclosure; Figure 4This is a schematic diagram of the signal sampling circuit of another power device provided in this embodiment; Figure 5 This is a schematic flowchart of a signal sampling method for a power device provided in an embodiment of this disclosure; Figure 6 This is a schematic diagram of the structure of a computer device provided in an embodiment of this disclosure.

[0019] In the accompanying diagram, markers with the same last two digits correspond to the same elements. It should be noted that the elements in the diagram are schematic and not drawn to scale. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are also within the scope of protection of this disclosure.

[0021] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this subject matter pertains. It will be further understood that terms such as those defined in commonly used dictionaries shall be interpreted as having the meaning consistent with their meaning in the context of the specification and in the relevant art, and shall not be interpreted in an idealized or overly formal form unless otherwise explicitly defined herein. As used herein, the statement of “connecting” or “coupling” two or more parts together shall mean that these parts are directly joined together or joined through one or more intermediate components.

[0022] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0024] Furthermore, in all embodiments of this disclosure, terms such as “first” and “second” are used only to distinguish one component (or part of a component) from another component (or another part of a component).

[0025] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0026] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0027] In view of the problems existing in the prior art, the present disclosure provides a signal sampling circuit for a power device. Figure 1 This is a schematic diagram of a signal sampling circuit for a power device according to an embodiment of the present disclosure. It is used to acquire the dynamic waveform of the power device in a switching circuit. The switching circuit includes a first power device Q1, a second power device A2, a first inductor L1, and a first capacitor C1. The drain terminal of the first power device Q1 is electrically connected to the first terminal of the first capacitor C1. The source terminal of the first power device Q1 is electrically connected to the drain terminal of the second power device Q2 and the first terminal of the first inductor L1, respectively. The source terminal of the second power device Q2 and the second terminal of the first inductor L1 are electrically connected to the second terminal of the first capacitor C1, respectively. Figure 1 As shown, the signal sampling circuit of the power device includes: a control module 10, a first drive module 20, and a first measurement module 30; the control module 10 is configured to output a first control signal to the first drive module 20 and output a first sampling synchronization signal to the first measurement module 30; the first drive module 20 is configured to drive the first power device Q1 to turn on or off according to the first control signal; the first measurement module 30 is configured to acquire the current signal of the first power device Q1 during the turn-on or turn-off process of the first power device Q1 according to the first sampling synchronization signal, transmit the voltage signal of the first power device, determine the loss of the first power device according to the voltage signal and the current signal, and output the digital voltage signal, digital current signal, and digital loss of the first power device.

[0028] Specifically, the signal sampling circuit of the power device provided in this embodiment is used to collect the dynamic waveform of the power device in the switching circuit of the power device, and the power device is a wide bandgap device such as a silicon carbide power device.

[0029] During the acquisition of the dynamic waveform corresponding to the first power device Q1, the second power device Q2 serves as a test power device. Specifically, when the first power device Q1 is in the on state, the first power device Q1, the first inductor L1, and the first capacitor C1 form a conduction loop. The first measurement module 30 acquires the current signal of the first power device Q1 in the on state, transmits the voltage signal of the first power device Q1 in the on state, and determines the loss of the first power device Q1 in the on state based on the current signal and voltage signal of the first power device Q1 in the on state. When the first power device Q1 is in the off state, the second power device Q2 and the first inductor L1 form a freewheeling loop. The first measurement module 30 acquires the current signal of the first power device Q1 in the off state, transmits the voltage signal of the first power device Q1 in the off state, and determines the loss of the first power device Q1 in the off state based on the current signal and voltage signal of the first power device Q1 in the off state.

[0030] To acquire the dynamic waveform of the power device in the on and off states, the signal sampling circuit of the power device provided in this embodiment includes at least a control module 10, a first driving module 20, and a first measurement module 30. The control module 10 outputs a first control signal to the first driving module 20, and the first driving module 20 drives the first power device Q1 to turn on or off based on the first control signal. In addition, during the process of outputting the first control signal to the first driving module 20, the first control module 10 outputs a first sampling synchronization signal to the first measurement module 30, so that the first measurement module 30 acquires the current signal of the first power device Q1 and transmits the voltage signal of the first power device Q1 during the process of the first driving module driving the first power device Q1 to turn on or off, and determines the loss of the first power device Q1 based on the voltage signal and current signal, and then outputs the digital voltage signal, digital current signal, and digital loss of the first power device Q1, which lays the foundation for the main control module to generate the dynamic waveform of the first power device based on the digital voltage signal, digital current signal, and digital loss of the first power device output by the first measurement module.

[0031] Since the signal sampling circuit of the power device provided in this embodiment is used to collect the dynamic waveform of the power device, and the power device is a wide bandgap device such as silicon carbide power device, based on the characteristics of wide bandgap devices, the switching rate of wide bandgap devices is relatively fast. How to realize the real change waveform of voltage (current) from 0V (A) to 1000V (A) in a time of ten nanoseconds or even less is a very challenging task. Therefore, this embodiment of the present disclosure additionally sets a first measurement module 30. The first measurement module 30 directly collects the current signal of the power device and transmits the voltage signal of the power device during the operation of the power device, and determines the power consumption based on the voltage signal and current signal. Based on the first measurement module 30, the signal is accurately measured during the conduction and turn-off of the power device. Compared with the prior art, which uses a probe extension line, that is, a long lead line method to collect the voltage signal and current signal of the power device, the inaccuracy of the tested power device signal caused by the parasitic inductance on the line is avoided.

[0032] In addition, in the signal sampling circuit of the power device provided in this embodiment, the control module 10 outputs a first sampling synchronization signal to the first measurement module 30 while outputting a first control signal to the first drive module 20, so that the first measurement module 30 synchronously collects the current signal of the first power device Q1 and transmits the voltage signal of the first power device Q1 during the turn-on or turn-off process. The accuracy of signal acquisition can be improved by the first sampling synchronization signal.

[0033] It should be noted that the first sampling synchronization signal is related to the first control signal. The first sampling synchronization signal is also on the rising edge of the first control signal. During the turn-on and turn-off process of the first power device, the first sampling synchronization signal remains at a high level.

[0034] The signal sampling circuit for the power device provided in this embodiment includes a control module that outputs a first control signal to a first drive module and a first sampling synchronization signal to a first measurement module. The first drive module drives the first power device to turn on or off according to the first control signal. The first measurement module collects the current signal of the first power device and transmits the voltage signal of the first power device during the turn-on or turn-off process according to the first sampling synchronization signal. It also determines the loss of the first power device based on the voltage signal and the current signal, and outputs the digital voltage signal, digital current signal, and digital loss of the first power device. This embodiment of the disclosure adds a first measurement module. During the operation of the power device, the first measurement module directly acquires the current signal of the power device, transmits the voltage signal of the first power device, and determines the power consumption based on the voltage and current signals. Based on the first measurement module, the signal measurement during the power device's on and off processes is accurate. Compared to the prior art using probe extension lines (i.e., long leads) to acquire the voltage and current signals of the power device, this avoids the inaccuracy of the tested power device signals caused by parasitic inductance on the line. Furthermore, in the signal sampling circuit of the power device provided in this embodiment, a first sampling synchronization signal is output to the first measurement module simultaneously with the first control signal output by the control module to the first drive module. This allows the first measurement module to synchronously acquire the voltage, current, and power loss of the first power device during its on or off processes, improving data acquisition accuracy through the first sampling synchronization signal.

[0035] Based on the above embodiments, Figure 2 This is a schematic diagram of the specific circuit structure of a signal sampling circuit for a power device provided in an embodiment of this disclosure, as shown below. Figure 2 As shown, the first measurement module 30 includes a first measurement unit, a second measurement unit, and a third measurement unit. The first measurement unit is configured to receive a first sampling synchronization signal, acquire the current signal of the first power device at the rising edge of the first sampling synchronization signal, and convert the current signal into a digital current signal. The second measurement unit is configured to receive the first sampling synchronization signal, transmit the voltage signal of the first power device at the rising edge of the first sampling synchronization signal, and convert the current signal into a digital current signal. The third measurement unit is configured to receive the first sampling synchronization signal, determine the loss of the first power device based on the current signal and the voltage signal at the rising edge of the first sampling synchronization signal, and convert the loss into a digital loss.

[0036] The first measurement unit includes a Hall sensor G1, a first amplifier A1 and a first analog-to-digital converter U1; the second measurement unit includes a high-frequency connector HF1, a first resistor R1, a second resistor R2, a second capacitor C2, a second amplifier A2 and a second analog-to-digital converter U2; and the third measurement unit includes a multiplier M1 and a third analog-to-digital converter U3. Hall sensor G1 is connected in series between the drain of first power device Q1 and the first terminal of first capacitor C1. The first terminal of first amplifier A1 receives the current signal of first power device Q1 collected by Hall sensor G1. The second terminal of first amplifier A1 is electrically connected to the first terminal of first analog-to-digital converter U1 and the first terminal of multiplier M1, respectively. The second terminal of first analog-to-digital converter U1 outputs a digital current signal. High-frequency connector HF1 is connected in parallel between the drain and source terminals of first power device Q1. The first terminal of first resistor R1 receives the voltage signal of first power device Q1 transmitted by high-frequency connector HF1. ​​The second terminal of first resistor R1 is electrically connected to the first terminal of second resistor R2 and the first terminal of second capacitor C2, respectively. The second terminal of second resistor R2 and the second terminal of second capacitor C2 are electrically connected to the first terminal of second amplifier A2, respectively. The second terminal of second amplifier A2 is electrically connected to the first terminal of second analog-to-digital converter U2 and the second terminal of multiplier M1, respectively. The second terminal of second analog-to-digital converter U2 outputs a digital voltage signal. The third terminal of multiplier M1 is electrically connected to the first terminal of third analog-to-digital converter U3. The second terminal of third analog-to-digital converter U3 outputs digital loss.

[0037] Hall sensor G1 is connected in series between the drain terminal of the first power device Q1 and the first terminal of the first capacitor. Hall sensor G1 collects the current signal flowing through the first power device Q1. The signal is amplified by the first amplifier A1 and sent to the first analog-to-digital converter U1, which converts the current signal of the first power device Q1 into a digital current signal.

[0038] High-frequency connector HF1 is connected in parallel between the drain and source terminals of the first power device Q1, and high-frequency connector HF1 transmits the source-drain voltage of the first power device Q1. That is, the voltage signal of the first power device Q1 is divided by the first resistor R1, and the high-frequency signal in the divided voltage signal is collected by the second resistor R2 and the second capacitor C2. The second amplifier A2 amplifies the signal and sends it to the second analog-to-digital converter U2, which converts the voltage signal of the first power device Q1 into a digital voltage signal.

[0039] It should be noted that the high-frequency connector HF1 can realize the rapid transmission of the voltage signal of the first power device Q1 during the turn-on or turn-off process, and realize the transmission of voltage signal of wide bandgap devices with fast switching speed in a time of ten nanoseconds or even less.

[0040] Specifically, considering the characteristics of high-frequency connectors, which are connection elements suitable for circuits above 100MHz and are key components for data transmission, high-frequency connectors offer excellent signal transmission performance and extremely high reliability, making them suitable for high-frequency signal transmission scenarios. Since the signal sampling circuit of the power device provided in this embodiment is used to acquire data from a new generation of wide-bandgap semiconductors, and this device under test has a very high bandwidth during switching—meaning its voltage signal changes within nanoseconds—a high-frequency connector is used. The RF connection probes of the high-frequency connector are connected to the drain and source terminals of the first power device Q1, respectively, and the voltage signal is transmitted through the RF connector.

[0041] It should be specifically noted that the high-frequency connector is a connecting device. The first connection port of the high-frequency connector is electrically connected to the drain terminal of the first power device Q1, the second connection port of the high-frequency connector is electrically connected to the source terminal of the first power device Q1, and the third connection port of the high-frequency connector is electrically connected to one end of the first resistor R1. The drain-source signal of the first power device Q1 can be transmitted through the high-frequency connector to the circuit containing the first resistor R1, the second resistor R2, the second capacitor C2, and the second amplifier A2. After conversion by the first resistor R1, the second resistor R2, the second capacitor C2, and the second amplifier A2, the signal is input to the second analog-to-digital converter U2. After the second analog-to-digital converter U2 converts the voltage signal of the first power device Q1 into a digital voltage signal, the control module acquires the digital voltage signal generated by the second analog-to-digital converter U2 through the digital interface.

[0042] Furthermore, it should be noted that the on / off state of the first power transistor is determined based on the first control signal output from the control module to the first drive module, which in turn drives the first power transistor to turn on or off. Specifically, when the signal output from the first drive module to the gate of the first power transistor is high, the first power transistor is on; when the signal output from the first drive module to the gate of the first power transistor is low, the first power transistor is off. Therefore, the control module can predict the change in the drain-source voltage of the first power transistor, and thus, through the first measurement module, acquire the current signal and transmit the voltage signal in the on / off state of the first power device.

[0043] Furthermore, as a connection probe, the high-frequency connector has no effect on the first power device in either the on or off state.

[0044] Furthermore, the loss of the first power device is the integral of the product of the voltage signal and the current signal, that is, the loss of the first power device satisfies: Therefore, by setting a multiplier M1 in the third measurement unit, the multiplier M1 receives the voltage signal from the first power device Q1. and current signal The voltage signal received from the first power device Q1 and current signal By multiplying and integrating, we can obtain the loss of the first power device.

[0045] Because the voltage and current signals of wide-bandgap devices change very rapidly, precise measurement of these signals and losses requires extremely small and high-bandwidth sampling loops. In this solution, the first drive module and the first measurement module are located close to the first power device to ensure a minimal measurement loop. The transmitted voltage signal is then sent to the second analog-to-digital converter (ADC), the acquired current signal to the first ADC, and the loss signal to the third ADC. These three ADCs are high-speed ADCs, enabling high-bandwidth sampling.

[0046] Based on the above embodiments, see below. Figure 2 The signal sampling circuit of the power device further includes: a main control module 40, configured to generate a first control signal, output the first control signal to the control module 10, and receive the digital voltage signal, digital current signal and digital loss of the first power device output by the first measurement module 30, and generate the dynamic waveform of the first power device during the conduction and turn-off process based on the digital voltage signal, digital current signal and digital loss.

[0047] The main control module 40 communicates with the first measurement module 30 via an optically isolated high-speed communication module.

[0048] On one hand, the main control module 40 generates a first control signal to the control module 10, and the control module 10 controls the first power device Q1 to turn on and off based on the first control signal. On the other hand, the main control module 40 receives the digital voltage signal, digital current signal, and digital loss of the first power device output by the first measurement module 30, and generates the waveform of the first power device during the turn-on and turn-off process based on the digital voltage signal, digital current signal, and digital loss. The main control module 40 communicates with the first measurement module 30 through an optically isolated high-speed communication module. The first measurement module 30 sends the digital voltage signal, digital current signal, and digital loss of the first power device Q1 to the main control module 40 through the optically isolated high-speed communication module. The main control module 40 generates the dynamic waveform of the first power device during the turn-on and turn-off process based on the received digital voltage signal, digital current signal, and digital loss of the first power device Q1. Figure 3 An example is shown illustrating the dynamic waveforms of the voltage signal, current signal, and losses of the first power device Q1 during conduction, wherein, The gate-source voltage input to the first power device Q1, This is the voltage signal of the first power device Q1. This is the current signal of the first power device Q1. This represents the power loss of the first power device, Q1.

[0049] In a preferred embodiment, the first measurement module 30 is integrated on the first drive module 20, and the measurement circuit corresponding to the first measurement module and the drive circuit corresponding to the first drive module are integrated into one unit.

[0050] To accurately measure the voltage, current, and losses of the first power device during its turn-on and turn-off processes, it is necessary to shorten the measurement loop. In this solution, the first measurement module can be integrated into the first drive module. The measurement circuit corresponding to the first measurement module and the drive circuit corresponding to the first drive module are integrated into one unit, so that the first drive module and the first measurement module are close to the first power device, ensuring a very small measurement loop.

[0051] Based on the above embodiments, Figure 4 This is a schematic diagram of the signal sampling circuit of another power device provided in this disclosure embodiment, as shown below. Figure 4 As shown, the power device switching circuit also includes a single-pole double-throw switch K and a second inductor L2. The first terminal of the single-pole double-throw switch K is electrically connected to the source terminal of the first power device Q1 and the drain terminal of the second power device Q2, respectively. The second terminal of the single-pole double-throw switch K is electrically connected to the first terminal of the second inductor L2, and the third terminal of the single-pole double-throw switch K is electrically connected to the first terminal of the first inductor L1. The control terminal of the single-pole double-throw switch K receives a third control signal output by the control module 10. The signal sampling circuit of the power device also includes a second drive module 50 and a second measurement module 60. The control module 10 is also configured to output a second... The second control module 50 is configured to send a control signal to the second drive module 50 and output a second sampling synchronization signal to the second measurement module 60. The second drive module 50 is configured to drive the second power device Q2 to turn on or off according to the second control signal. The second measurement module 60 is configured to acquire the current signal of the second power device Q2 during the turn-on or turn-off process according to the second sampling synchronization signal, transmit the voltage signal of the second power device, determine the loss of the second power device based on the voltage signal and the current signal, and output the digital voltage signal, digital current signal and digital loss of the second power device.

[0052] The most common application scenario for power devices is the half-bridge topology, such as... Figure 4 The first power device Q1 and the second power device Q2 shown form a half-bridge power topology. In practical applications, it is necessary to drive and measure the dynamic waveforms of the first power device Q1 and the second power device Q2. Therefore, this scheme can integrate more sampling resources to simultaneously measure the dynamic waveforms of the two power devices, such as... Figure 4As shown, in the application scenario of a half-bridge topology for power devices, a second driving module 50 and a second measurement module 60 are added to the signal sampling circuit of the power device. The second driving module 50 is used to drive the second power device to turn on or off according to the second control signal. The second measurement module 60 collects the current signal of the second power device, transmits the voltage signal of the second power device, determines the loss of the second power device based on the voltage signal and the current signal, and outputs the digital voltage signal, digital current signal and digital loss of the second power device. The specific circuit of the second measurement module is the same as the circuit structure of the first measurement module, and the acquisition method is the same as the dynamic acquisition process of the first power device Q1. This embodiment of the disclosure will not describe this in detail.

[0053] It should be noted that during the acquisition of the dynamic waveform corresponding to the first power device, the second power device serves as a test power device. Specifically, when the first power device is on, the first power device, the first inductor, and the first capacitor form a conduction loop, and the voltage signal, current signal, and loss of the first power device in the on state are acquired. When the first power device is off, the second power device and the first inductor form a freewheeling loop, and the voltage signal, current signal, and loss of the first power device in the off state are acquired. When the second power device is on, the first power device, the second inductor, and the first capacitor form a conduction loop, and the voltage signal, current signal, and loss of the second power device in the off state are acquired. The voltage signal, current signal, and loss of the second power device in the on state are collected. In the off state of the second power device, the first power device and the second inductor form a freewheeling circuit. Therefore, a single-pole double-throw switch and a second inductor need to be set in the power device switching circuit. The first terminal of the single-pole double-throw switch is electrically connected to the source terminal of the first power device and the drain terminal of the second power device, respectively. The second terminal of the single-pole double-throw switch is electrically connected to the first terminal of the second inductor. The third terminal of the single-pole double-throw switch is electrically connected to the first terminal of the first inductor. The control terminal of the single-pole double-throw switch receives the third control signal output by the control module.

[0054] Specifically, when the signal sampling circuit of the power device acquires the dynamic waveform of the first power device, the control module 10 outputs a third control signal to the single-pole double-throw switch K, controlling the first and third terminals of the single-pole double-throw switch K to be electrically connected. This enables the first power device Q1, the first inductor L1, and the first capacitor C1 to form a conduction loop when the first power device Q1 is on, and to acquire the voltage signal, current signal, and loss of the first power device in the on state. When the first power device Q1 is off, the second power device Q1 and the first inductor L1 form a freewheeling loop, and to acquire the voltage signal, current signal, and loss of the first power device Q1 in the off state. When the signal sampling circuit of the power device acquires the dynamic waveform of the second power device Q2, the control module 10 outputs a third control signal to the single-pole double-throw switch K, controlling the first and second terminals of the single-pole double-throw switch K to be electrically connected. This enables the second power device Q2, the second inductor L2, and the first capacitor C1 to form a conduction loop when the second power device Q2 is on, and to acquire the voltage signal, current signal, and loss of the second power device Q1 when it is on. When the second power device Q2 is off, the first power device Q1 and the second inductor L2 form a freewheeling loop, and to acquire the voltage signal, current signal, and loss of the second power device Q2 when it is off.

[0055] In addition, the control module 10 is also configured to output a second control signal to the second drive module 50 and a second sampling synchronization signal to the second measurement module 60, so that the second drive module 50 drives the second power device Q2 to turn on or off according to the second control signal, and the second measurement module 60 collects the current signal of the second power device Q2 during the turn-on or turn-off process according to the second sampling synchronization signal, transmits the voltage signal of the second power device, determines the loss of the second power device according to the voltage signal and the current signal, and outputs the digital voltage signal, digital current signal and digital loss of the second power device.

[0056] In the above implementation process, the first sampling synchronization signal is related to the first control signal. The first sampling synchronization signal is also a rising edge on the rising edge of the first control signal. During the turn-on and turn-off process of the first power device, the first sampling synchronization signal remains at a high level. When the control module stops outputting the first control signal, the first sampling synchronization signal becomes a low level. The second sampling synchronization signal is related to the second control signal. The second sampling synchronization signal is also a rising edge on the rising edge of the second control signal. During the turn-on and turn-off process of the second power device, the second sampling synchronization signal remains at a high level. When the control module stops outputting the second control signal, the second sampling synchronization signal becomes a low level.

[0057] Based on the above embodiments, this disclosure also provides a signal sampling method for power devices. Figure 5This is a schematic flowchart of the signal sampling method for the power device provided in the embodiments of this disclosure, as shown below. Figure 5 As shown, the signal sampling methods for power devices include: S110 outputs the first control signal and the first sampling synchronization signal.

[0058] S120. Drive the first power device to turn on or off according to the first control signal.

[0059] S130. Based on the first sampling synchronization signal, during the turn-on or turn-off process of the first power device, the current signal of the first power device is collected, the voltage signal of the first power device is transmitted, and the loss of the first power device is determined based on the voltage signal and the current signal, and the digital voltage signal, digital current signal and digital loss of the first power device are output.

[0060] The signal sampling method for power devices provided in this disclosure directly acquires the voltage and current signals of the power device during its operation, and determines the power consumption based on the voltage and current signals. This achieves accurate measurement of signals during the power device's on and off processes. Compared to the prior art, which uses probe extension lines (i.e., long leads) to acquire the voltage and current signals of the power device, this method avoids the inaccuracy of the tested power device signals caused by parasitic inductance on the line. Furthermore, the signal sampling circuit for power devices provided in this disclosure outputs a first sampling synchronization signal simultaneously with the first control signal, so as to simultaneously acquire the voltage, current, and power loss of the first power device during its on or off processes. The accuracy of data acquisition can be improved through the first sampling synchronization signal.

[0061] This application also provides a computer device, please refer to the following for details. Figure 6 , Figure 6 This is a basic structural block diagram of the computer device in this embodiment.

[0062] The computer device includes a memory 510 and a processor 520 that are interconnected via a system bus. It should be noted that only a computer device with components 510-520 is shown in the figure; however, it should be understood that it is not required to implement all the shown components, and more or fewer components may be implemented alternatively. Those skilled in the art will understand that the computer device described herein is a device capable of automatically performing numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes, but is not limited to, microprocessors, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), digital signal processors (DSPs), embedded devices, etc.

[0063] Computer devices can include desktop computers, laptops, handheld computers, and cloud servers. These devices allow for human-computer interaction with users through keyboards, mice, remote controls, touchpads, or voice-activated devices.

[0064] The memory 510 includes at least one type of readable storage medium, including non-volatile memory or volatile memory, such as flash memory, hard disk, multimedia card, card-type memory (e.g., SD or DX memory), random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, magnetic disk, optical disk, etc. RAM may include static RAM or dynamic RAM. In some embodiments, the memory 510 may be an internal storage unit of a computer device, such as the hard disk or memory of the computer device. In other embodiments, the memory 510 may also be an external storage device of the computer device, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, or flash card equipped on the computer device. Of course, the memory 510 may include both internal storage units and external storage devices of the computer device. In this embodiment, the memory 510 is typically used to store the operating system and various application software installed on the computer device, such as the program code of the method described above. In addition, the memory 510 may also be used to temporarily store various types of data that have been output or will be output.

[0065] The processor 520 is typically used to perform the overall operation of a computer device. In this embodiment, the memory 510 is used to store program code or instructions, including computer operation instructions. The processor 520 is used to execute the program code or instructions stored in the memory 510 or to process data, such as program code that runs the methods described above.

[0066] In this article, the bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. This bus system can be divided into address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used to represent it in the diagram, but this does not mean that there is only one bus or one type of bus.

[0067] Another embodiment of this application also provides a computer-readable medium, which may be a computer-readable signal medium or a computer-readable medium. A processor in a computer reads computer-readable program code stored in the computer-readable medium, enabling the processor to execute the functional actions specified in each step or combination of steps in the above method; and to generate means for implementing the functional actions specified in each block or combination of blocks in the block diagram.

[0068] Computer-readable media include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared memory or semiconductor systems, devices or apparatuses, or any suitable combination thereof, wherein the memory is used to store program code or instructions, the program code including computer operation instructions, and the processor is used to execute the program code or instructions of the above-described methods stored in the memory.

[0069] The definitions of memory and processor can be found in the description of the foregoing computer device embodiments, and will not be repeated here.

[0070] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0071] In the various embodiments of this application, the functional units or modules can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0072] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0073] Unless otherwise expressly indicated by the context, the singular form of words used herein and in the appended claims includes the plural form, and vice versa. Thus, when referring to the singular, the plural form of the corresponding term is generally included. Similarly, the terms “comprising” and “including” shall be interpreted as including rather than exclusively. Likewise, the terms “including” and “or” shall be interpreted as including unless such interpretation is expressly prohibited herein. Where the term “example” is used herein, particularly when it follows a set of terms, the “example” is merely exemplary and illustrative and should not be considered exclusive or extensive.

[0074] Further aspects and scope of adaptation become apparent from the description provided herein. It should be understood that various aspects of this application may be implemented individually or in combination with one or more other aspects. It should also be understood that the descriptions and specific embodiments herein are for illustrative purposes only and are not intended to limit the scope of this application.

[0075] Several embodiments of this disclosure have been described in detail above. However, it is obvious that those skilled in the art can make various modifications and variations to the embodiments of this disclosure without departing from the spirit and scope of this disclosure. The scope of protection of this disclosure is defined by the appended claims.

Claims

1. A signal sampling circuit for a power device, used to acquire the dynamic waveform of a power device in a power device switching circuit, the power device switching circuit comprising a first power device, a second power device, a first inductor, and a first capacitor, wherein the drain terminal of the first power device is electrically connected to a first terminal of the first capacitor, the source terminal of the first power device is electrically connected to the drain terminal of the second power device and a first terminal of the first inductor, and the source terminal of the second power device and a second terminal of the first inductor are electrically connected to a second terminal of the first capacitor, characterized in that... include: Control module, first drive module, and first measurement module; The control module is configured to output a first control signal to the first drive module and to output a first sampling synchronization signal to the first measurement module; The first driving module is configured to drive the first power device to turn on or off according to the first control signal; The first measurement module is configured to acquire the current signal of the first power device during the turn-on or turn-off process of the first power device according to the first sampling synchronization signal, transmit the voltage signal of the first power device, determine the loss of the first power device according to the voltage signal and the current signal, and output the digital voltage signal, digital current signal and digital loss of the first power device.

2. The circuit according to claim 1, characterized in that, The first measurement module includes a first measurement unit, a second measurement unit, and a third measurement unit; The first measurement unit is configured to receive the first sampling synchronization signal, acquire the current signal of the first power device at the rising edge of the first sampling synchronization signal, and convert the current signal into a digital current signal; The second measurement unit is configured to receive the first sampling synchronization signal, transmit the voltage signal of the first power device on the rising edge of the first sampling synchronization signal, and convert the current signal into a digital current signal; The third measurement unit is configured to receive the first sampling synchronization signal, determine the loss of the first power device based on the current signal and the voltage signal at the rising edge of the first sampling synchronization signal, and convert the loss into digital loss.

3. The circuit according to claim 2, characterized in that, The first measurement unit includes a Hall sensor, a first amplifier, and a first analog-to-digital converter; the second measurement unit includes a high-frequency connector, a first resistor, a second resistor, a second capacitor, a second amplifier, and a second analog-to-digital converter; and the third measurement unit includes a multiplier and a third analog-to-digital converter. The Hall sensor is connected in series between the drain terminal of the first power device and the first terminal of the first capacitor. The first terminal of the first amplifier receives the current signal of the first power device acquired by the Hall sensor. The second terminal of the first amplifier is electrically connected to the first terminal of the first analog-to-digital converter and the first terminal of the multiplier, respectively. The second terminal of the first analog-to-digital converter outputs a digital current signal. The high-frequency connector is connected in parallel between the drain terminal and the source terminal of the first power device. The first terminal of the first resistor receives the voltage signal of the first power device transmitted by the high-frequency connector. The second terminal of the first resistor is electrically connected to the first terminal of the second resistor and the first terminal of the second capacitor, respectively. The second terminal of the second resistor and the second terminal of the second capacitor are electrically connected to the first terminal of the second amplifier, respectively. The second terminal of the second amplifier is electrically connected to the first terminal of the second analog-to-digital converter and the second terminal of the multiplier, respectively. The second terminal of the second analog-to-digital converter outputs a digital voltage signal. The third terminal of the multiplier is electrically connected to the first terminal of the third analog-to-digital converter. The second terminal of the third analog-to-digital converter outputs a digital loss.

4. The circuit according to claim 1, characterized in that, It also includes the main control module; The main control module is configured to generate a first control signal, output the first control signal to the control module, receive the digital voltage signal, digital current signal and digital loss of the first power device output by the first measurement module, and generate the dynamic waveform of the first power device during the turn-on and turn-off process based on the digital voltage signal, digital current signal and digital loss.

5. The circuit according to claim 4, characterized in that, The main control module communicates with the first measurement module via an optically isolated high-speed communication module.

6. The circuit according to claim 1, characterized in that, The first measurement module is integrated on the first driving module, and the measurement circuit corresponding to the first measurement module and the driving circuit corresponding to the first driving module are integrally set.

7. The circuit according to claim 1, characterized in that, The power device switching circuit further includes a single-pole double-throw switch and a second inductor. The first terminal of the single-pole double-throw switch is electrically connected to the source terminal of the first power device and the drain terminal of the second power device, respectively. The second terminal of the single-pole double-throw switch is electrically connected to the first terminal of the second inductor. The third terminal of the single-pole double-throw switch is electrically connected to the first terminal of the first inductor. The control terminal of the single-pole double-throw switch receives a third control signal output by the control module. The signal sampling circuit of the power device further includes a second driving module and a second measurement module; The control module is further configured to output a second control signal to the second drive module and to output a second sampling synchronization signal to the second measurement module; The second drive module is configured to drive the second power device to turn on or off according to the second control signal; The second measurement module is configured to acquire the current signal of the second power device during the turn-on or turn-off process of the second power device according to the second sampling synchronization signal, transmit the voltage signal of the second power device, determine the loss of the second power device according to the voltage signal and the current signal, and output the digital voltage signal, digital current signal and digital loss of the second power device.

8. A signal sampling method for a power device, used to acquire the dynamic waveform of a power device in a power device switching circuit, the power device switching circuit comprising a first power device, a second power device, a first inductor, and a first capacitor, wherein the drain terminal of the first power device is electrically connected to a first terminal of the first capacitor, the source terminal of the first power device is electrically connected to the drain terminal of the second power device and a first terminal of the first inductor respectively, and the source terminal of the second power device and a second terminal of the first inductor are electrically connected to a second terminal of the first capacitor respectively, characterized in that, The method includes: Output the first control signal and the first sampling synchronization signal; According to the first control signal, drive the first power device to turn on or off; Based on the first sampling synchronization signal, the current signal of the first power device is acquired during the turn-on or turn-off process of the first power device, the voltage signal of the first power device is transmitted, and the loss of the first power device is determined based on the voltage signal and the current signal, and the digital voltage signal, digital current signal and digital loss of the first power device are output.

9. A computer device, characterized in that, include: One or more processors; Storage device for storing one or more programs. When the one or more programs are executed by the one or more processors, the one or more processors perform the method as described in claim 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in claim 8.

Images