Power tube conduction voltage drop detection method, device, electronic equipment and storage medium

Abstract

The present application relates to a method, device, electronic device and storage medium for detecting the on-state voltage drop of a power tube, and belongs to the field of voltage drop detection technology. The method comprises: in a first carrier cycle, respectively setting the first current, the second current and the third current of the input inverter bridge, respectively obtaining the corresponding first voltage, the second voltage and the third voltage; in a second carrier cycle, obtaining the fourth voltage corresponding to the third current; according to the first voltage, the second voltage, the third voltage, the fourth voltage, the first current, the second current, the third current, the first carrier cycle, the second carrier cycle and the load impedance, obtaining the on-state voltage drop of the power tube. The method can accurately detect the on-state voltage drop of the power tube, and provides a basis for realizing accurate compensation.

Description

Technical Field

[0001] The present application relates to the technical field of voltage drop detection, and in particular to a method, device, electronic device and storage medium for detecting a power tube conduction voltage drop. Background Art

[0002] In the inverter three-phase inverter bridge PWM drive, the power device needs a certain turn-on and turn-off time when it is turned on and off, so a dead time must be inserted to prevent the bridge arm from short-circuiting and ensure the safe operation of the inverter. The nonlinear factors of the inverter bridge include dead time, the turn-on and turn-off time of the power tube, and the conduction voltage drop. The nonlinear factors work together to cause the output waveform of the inverter to be distorted, reduce the fundamental amplitude, increase the harmonic loss of the motor, and cause no-load oscillation when the motor runs at low speed. In order to meet the low-speed and light-load operation of the motor, the error voltage caused by the nonlinear factors of the inverter bridge must be detected and compensated.

[0003] The error voltage caused by the nonlinear factors of the inverter bridge mainly includes two parts: the error voltage caused by the actual dead time and the error voltage caused by the conduction voltage drop of the inverter bridge power tube. At present, when calculating the error voltage, the conduction voltage drop is generally estimated as a constant, or calculated by checking the parameters in the device manual. However, the device manual only contains relevant parameters under specific operating conditions, and cannot be combined with actual working conditions to obtain an accurate conduction voltage drop. Summary of the invention

[0004] In order to solve the technical problem of inaccurate on-state voltage drop detection, the present application provides a method, device, electronic device and storage medium for detecting on-state voltage drop of a power tube.

[0005] In a first aspect, the present application provides a method for detecting a power tube conduction voltage drop, the method comprising:

[0006] In a first carrier cycle, a first current, a second current and a third current are respectively set to input the inverter bridge, and a first voltage corresponding to the first current, a second voltage corresponding to the second current and a third voltage corresponding to the third current are respectively obtained;

[0007] Under a second carrier cycle, obtaining a fourth voltage corresponding to the third current;

[0008] Obtaining a power tube conduction voltage drop according to the first voltage, the second voltage, the third voltage, the fourth voltage, the first current, the second current, the third current, the first carrier cycle, the second carrier cycle, and load impedance;

[0009] Further, according to the first voltage, the second voltage, the third voltage, the fourth voltage, the first current, the second current, the third current, the first carrier cycle, the second carrier cycle and the load impedance, a power tube conduction voltage drop is obtained, including:

[0010] A total resistance is obtained according to the first voltage, the second voltage, the first current and the second current; a total resistance voltage drop is obtained according to the third current and the total resistance; wherein the total resistance voltage drop is proportional to the third current, proportional to the first difference, and inversely proportional to the second difference; the first difference is the difference between the first voltage and the second voltage, and the second difference is the difference between the first current and the second current;

[0011] A voltage drop affected by the dead time is obtained according to the third voltage, the fourth voltage, the first carrier period, and the second carrier period; wherein the voltage drop affected by the dead time is proportional to the second carrier period, proportional to the third difference, and inversely proportional to the fourth difference; the third difference is the difference between the third voltage and the fourth voltage, and the fourth difference is the difference between the second carrier period and the first carrier period;

[0012] A threshold voltage is obtained according to the third voltage, the total resistance voltage drop and the voltage drop affected by the dead time; wherein the threshold voltage is the difference between the fifth difference and the voltage drop affected by the dead time; and the fifth difference is the difference between the third voltage and the total resistance voltage drop;

[0013] Obtaining the on-resistance according to the total resistance and the load impedance, and obtaining the on-voltage drop of the power tube according to the threshold voltage and the on-resistance;

[0014] Further, the first current is smaller than the second current, and the second current is smaller than the third current;

[0015] Further, respectively obtaining a first voltage corresponding to the first current, a second voltage corresponding to the second current, and a third voltage corresponding to the third current, includes:

[0016] Obtaining a first voltage corresponding to the first current being stably output for a first time period;

[0017] Obtaining a second voltage corresponding to the second current being stably output for a second period of time;

[0018] Obtaining a third voltage corresponding to the third current being stably output for a third time period;

[0019] Further, a total resistance is obtained according to the first voltage, the second voltage, the first current, and the second current; and a total resistance voltage drop is obtained according to the third current and the total resistance, including:

[0020]

[0021]

[0022] Among them, I 1 is the first current, I 2 is the second current, I 3 is the third current, U 1 is the first voltage, U 2 is a second voltage;

[0023] Further, obtaining a voltage drop affected by the dead time according to the third voltage, the fourth voltage, the first carrier period, and the second carrier period includes:

[0024]

[0025] Among them, U dt1 is the voltage drop affected by the dead time in the first carrier cycle, U 3 is the third voltage, U 4 is the fourth voltage, P rd1 is the first carrier cycle, P rd2 is the second carrier period;

[0026] Further, obtaining a threshold voltage according to the third voltage, the total resistance voltage drop and the voltage drop affected by the dead time includes:

[0027]

[0028] Among them, U th is the threshold voltage;

[0029] Further, according to the threshold voltage and the on-resistance, a power tube on-voltage drop is obtained, including:

[0030] Obtaining, according to the on-resistance and the third current, a voltage drop when the third current passes through the on-resistance;

[0031] The on-state voltage drop of the power tube is obtained according to the voltage drop when the third current passes through the on-state resistor and the threshold voltage.

[0032] In a second aspect, the present application provides a power tube conduction voltage drop detection device, the device comprising:

[0033] A first acquisition module is used to respectively set a first current, a second current and a third current of an input inverter bridge under a first carrier cycle, and to respectively acquire a first voltage corresponding to the first current, a second voltage corresponding to the second current and a third voltage corresponding to the third current;

[0034] A second acquisition module, used for acquiring a fourth voltage corresponding to the third current in a second carrier cycle;

[0035] A calculation module is used to obtain a power tube conduction voltage drop according to the first voltage, the second voltage, the third voltage, the fourth voltage, the first current, the second current, the third current, the first carrier period, the second carrier period and the load impedance.

[0036] In a third aspect, the present application provides an electronic device, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus;

[0037] Memory, used to store computer programs;

[0038] The processor is used to implement the steps of the power tube conduction voltage drop detection method described in any embodiment of the first aspect when executing the program stored in the memory.

[0039] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the power tube on-state voltage drop detection method as described in any embodiment of the first aspect are implemented.

[0040] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0041] The method provided in the embodiment of the present application obtains the first voltage, the second voltage and the third voltage respectively corresponding to the first carrier cycle by setting three different first currents, the second current and the third current, and obtains the fourth voltage corresponding to the third current in the second carrier cycle, and obtains the power tube conduction voltage drop according to the first voltage, the second voltage, the third voltage, the fourth voltage, the first current, the second current, the third current, the first carrier cycle, the second carrier cycle and the load impedance. The method realizes accurate detection of the power tube conduction voltage drop without adding additional hardware. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

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

[0044] Figure 1 A three-phase inverter bridge circuit diagram for applying a power tube conduction voltage drop detection method provided in one embodiment of the present application;

[0045] Figure 2 A schematic diagram of a power tube conduction voltage drop detection principle provided by an embodiment of the present application;

[0046] Figure 3 An equivalent diagram of the on-state voltage drop of a power tube provided by an embodiment of the present application;

[0047] Figure 4 A schematic diagram of a flow chart of a method for detecting a power tube conduction voltage drop provided by an embodiment of the present application;

[0048] Figure 5 A schematic flow chart of a method for detecting a power tube conduction voltage drop provided by another embodiment of the present application;

[0049] Figure 6 An inverter bridge output current and voltage waveform diagram using a power tube conduction voltage drop detection method provided in one embodiment of the present application;

[0050] Figure 7 A schematic diagram of the structure of a power tube conduction voltage drop detection device provided in one embodiment of the present application;

[0051] Figure 8 A schematic diagram of the structure of an electronic device provided in accordance with an embodiment of the present application. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0053] The first embodiment of the present application provides a method for detecting a power tube conduction voltage drop. The method can be applied to Figure 1 The three-phase inverter bridge circuit shown in FIG. 1 is a three-phase inverter bridge circuit, wherein S1, S2, S3, S4, S5, and S6 are IGBT (Insulated Gate Bipolar Transistor) modules, V dc is the DC power supply, V A 、V B 、V Cis the three-phase AC output after inversion. The schematic diagram of the three-phase inverter bridge circuit during the on-state voltage drop detection process is shown in Figure 2 As shown, E represents the DC power supply, i represents the current passing through the circuit, and U, V, and W represent the three-phase AC power after inversion.

[0054] The equivalent diagram of the power tube conduction voltage drop is as follows: Figure 3 As shown, the horizontal axis is voltage and the vertical axis is current. Part of the on-state voltage drop is a fixed threshold voltage; the other part changes with the current and is approximately the voltage drop generated when the current flows through the on-state resistance. The calculation formula is:

[0055] U d =U th +I×R on (1)

[0056] Among them, U d is the conduction voltage drop of the power tube, U th is the threshold voltage, R on is the on-resistance, and I is the current flowing through the on-resistance. By calculating the threshold voltage and the on-resistance, and then measuring the current in the circuit, the on-voltage drop of the power tube can be accurately calculated. The following is a detailed description of the on-voltage drop detection method for the power tube.

[0057] A method for detecting a power tube conduction voltage drop, such as Figure 4 , methods include:

[0058] Step 401, in a first carrier cycle, respectively set a first current, a second current and a third current of an input inverter bridge, and respectively obtain a first voltage corresponding to the first current, a second voltage corresponding to the second current and a third voltage corresponding to the third current.

[0059] Step 402: acquiring a fourth voltage corresponding to the third current in a second carrier cycle.

[0060] Step 403, obtaining a power tube conduction voltage drop according to the first voltage, the second voltage, the third voltage, the fourth voltage, the first current, the second current, the third current, the first carrier period, the second carrier period and the load impedance.

[0061] The method can accurately detect the conduction voltage drop of the power tube, providing a basis for achieving accurate compensation, and does not require additional hardware. The detection method is simple and convenient.

[0062] There are many ways to calculate the total resistance. It can be calculated by any two of the three sets of current and voltage parameters obtained under the first carrier period. For example, it can be calculated by the first voltage, the second voltage, the first current and the second current. It can be calculated by the first voltage, the third voltage, the first current and the third current. It can be calculated by the second voltage, the third voltage, the second current and the third current. Of course, it is also possible to take any two of the three sets of current and voltage parameters to obtain three sets of total resistances, and then take the average of the three sets of total resistances as the total resistance to make the calculation result more accurate.

[0063] In one embodiment, the power tube conduction voltage drop is obtained according to the first voltage, the second voltage, the third voltage, the fourth voltage, the first current, the second current, the third current, the first carrier cycle, the second carrier cycle and the load impedance, such as Figure 5 ,include:

[0064] Step 501, obtain the total resistance according to the first voltage, the second voltage, the first current and the second current; obtain the total resistance voltage drop according to the third current and the total resistance; wherein the total resistance voltage drop is proportional to the third current, proportional to the first difference, and inversely proportional to the second difference; the first difference is the difference between the first voltage and the second voltage, and the second difference is the difference between the first current and the second current.

[0065] Step 502, obtain the voltage drop affected by the dead time according to the third voltage, the fourth voltage, the first carrier period and the second carrier period; wherein the voltage drop affected by the dead time is proportional to the second carrier period, proportional to the third difference, and inversely proportional to the fourth difference; the third difference is the difference between the third voltage and the fourth voltage, and the fourth difference is the difference between the second carrier period and the first carrier period.

[0066] Step 503, obtaining a threshold voltage according to the third voltage, the total resistance voltage drop and the voltage drop affected by the dead time; wherein the threshold voltage is the difference between the fifth difference and the voltage drop affected by the dead time; and the fifth difference is the difference between the third voltage and the total resistance voltage drop.

[0067] Step 504, obtaining the on-resistance according to the total resistance and the load impedance, and obtaining the on-voltage drop of the power tube according to the threshold voltage and the on-resistance.

[0068] In this embodiment, the carrier cycle of the PWM control module is set to the first carrier cycle, and a DC current is input to the inverter bridge. The current size is set to the first current, and the first voltage corresponding to the first current is recorded. The current is set to the second current, and the second voltage corresponding to the second current is recorded. The current is set to the third current, and the third voltage corresponding to the third current is recorded. The carrier cycle of the PWM control module is set to the second carrier cycle, and the fourth voltage corresponding to the third current is recorded.

[0069] Among them, the total resistance can be calculated according to the first voltage, the second voltage, the first current and the second current; after obtaining the total resistance, the total resistance voltage drop under any current can be obtained, and here the total resistance voltage drop under the third current is obtained according to the third current and the total resistance; wherein the total resistance voltage drop is proportional to the third current, proportional to the first difference, and inversely proportional to the second difference; the first difference is the difference between the first voltage and the second voltage, and the second difference is the difference between the first current and the second current.

[0070] Then, based on the third voltage and the fourth voltage under different carrier periods under the same third current, as well as the first carrier period and the second carrier period, the voltage drop affected by the dead time is obtained; the voltage drop affected by the dead time is proportional to the second carrier period, proportional to the third difference, and inversely proportional to the fourth difference; the third difference is the difference between the third voltage and the fourth voltage, and the fourth difference is the difference between the second carrier period and the first carrier period.

[0071] A threshold voltage is obtained according to the third voltage, the total resistance voltage drop and the voltage drop affected by the dead time; wherein the threshold voltage is the difference between the fifth difference and the voltage drop affected by the dead time; and the fifth difference is the difference between the third voltage and the total resistance voltage drop.

[0072] The total resistance is the sum of the load impedance and the on-resistance. Therefore, the on-resistance can be obtained according to the total resistance and the load impedance. Combining the above formula (1), the on-voltage drop of the power tube can be obtained according to the threshold voltage and the on-resistance.

[0073] In this embodiment, the total resistance obtained based on the first voltage, the second voltage, the first current and the second current that are relatively independent of the third current is relatively stable. When the total resistance voltage drop is calculated with the third current, a relatively stable total resistance voltage drop can be obtained, thereby improving the accuracy of the result. In this embodiment, the power tube conduction voltage drop detection method can adapt to various power levels, and can accurately detect the power tube conduction voltage drop when the power tube conduction voltage drop changes due to different operating temperatures and driving voltages, thereby providing a basis for achieving precise compensation. Moreover, it is only necessary to detect the current and voltage parameters under different carrier cycles, combined with the known load impedance, to obtain the accurate power tube conduction voltage drop, without the need for additional hardware resources, and the detection method is simple and convenient.

[0074] It should be noted that, in this embodiment, calculating the total resistance by using the first voltage, the second voltage, the first current, and the second current is only an example, and the total resistance may also be calculated by other methods mentioned above.

[0075] In one embodiment, the first current is smaller than the second current, and the second current is smaller than the third current. During the detection process, the carrier cycle of the PWM control module is set to the first carrier cycle, a DC current is input to the inverter bridge, the current magnitude increases slowly from 0 to the stable first current, and the first voltage currently output is recorded; the current magnitude increases slowly from the first current to the stable second current, and the second voltage currently output corresponding to the second current is recorded; the current magnitude increases slowly from the second current to the stable third current, and the third voltage currently output is recorded, the carrier cycle of the PWM control module is set to the second carrier cycle, the current magnitude is the stable third current, and the fourth voltage currently output corresponding to the third current is recorded. Collecting the current in order from small to large is conducive to the stable operation of the inverter circuit.

[0076] In one embodiment, a first voltage corresponding to a first current, a second voltage corresponding to a second current, and a third voltage corresponding to a third current are obtained respectively, including: obtaining a first voltage corresponding to the first current after it has been stably output for a first period of time; obtaining a second voltage corresponding to the second current after it has been stably output for a second period of time; and obtaining a third voltage corresponding to the third current after it has been stably output for a third period of time.

[0077] In this embodiment, during the acquisition process, since the current is gradually changing, when the first current is just reached, the corresponding voltage will fluctuate. After the first voltage is stably output for a first time, a relatively stable first voltage can be obtained. Figure 6 As shown, the same applies when collecting the second voltage, the third voltage, and the fourth voltage, wherein the first duration, the second duration, and the third duration can be set as needed, as long as the collected voltage is relatively stable, and the specific duration is not limited. Of course, the first duration, the second duration, and the third duration can also be set to the same duration.

[0078] The relationship between output voltage and current is:

[0079] U=I×(R s +R on )+U dt +U th (2)

[0080] Among them, R s is the load impedance, R on is the on-resistance, U dt is the influence of the dead time under the corresponding carrier on the output voltage, U th is the power tube conduction threshold voltage, which can also be referred to as the threshold voltage, and U is the voltage corresponding to the current I. According to the current-voltage relationship of formula (2), the threshold voltage and the on-resistance of the inverter bridge power tube can be calculated by combining the first carrier period, the second carrier period, the first current, the second current, the third current, the first voltage, the second voltage, the third voltage and the fourth voltage.

[0081] The specific steps are as follows:

[0082] In one embodiment, the total resistance is obtained according to the first voltage, the second voltage, the first current and the second current; and the total resistance voltage drop is obtained according to the third current and the total resistance.

[0083] In this embodiment, according to the above formula (2), U 1 with I 1 , U 2 with I 2 The corresponding relationship:

[0084] U 1 =I 1 ×(R s +R on )+U dt +U th (3)

[0085] U 2 =I 2 ×(R s +R on )+U dt +U th (4)

[0086] According to equations (3) and (4), the total resistance, which is the sum of the load impedance and the on-resistance, can be obtained by the difference method:

[0087]

[0088] According to the third current I 3 And the above formula (5), the total resistance voltage drop is obtained:

[0089]

[0090] Among them, I 1 is the first current, I 2 is the second current, I 3 is the third current, U 1 is the first voltage, U 2 is the second voltage.

[0091] In one embodiment, obtaining the voltage drop affected by the dead time according to the third voltage, the fourth voltage, the first carrier cycle, and the second carrier cycle includes:

[0092]

[0093] Among them, U dt1 is the voltage drop affected by the dead time in the first carrier cycle, U 3 is the third voltage, U 4 is the fourth voltage, Prd1 is the first carrier cycle, P rd2 is the second carrier cycle.

[0094] The specific calculation process can refer to the calculation method of dead time voltage drop, as follows:

[0095] According to formula (2), we can get U 3 with U 4 :

[0096] U 3 =I 3 ×(R s +R on )+U dt1 +U th (8)

[0097] U 4 =I 3 ×(R s +R on )+U dt2 +U th (9)

[0098] Among them, U dt2 is the voltage drop affected by the dead time in the second carrier cycle. By subtracting equations (8) and (9), we can obtain:

[0099] U 3 -U 4 =U dt1 -U dt2 (10)

[0100] in addition,

[0101]

[0102] Among them, DT is the actual dead time, U dc is the bus voltage. Combining equations (10), (11) and (12), we can get the result of equation (7).

[0103] In this embodiment, the voltage drop U affected by the dead time in the first carrier cycle can be obtained according to the third voltage, the fourth voltage, the first carrier cycle and the second carrier cycle. dt1 .

[0104] In one embodiment, the threshold voltage is obtained according to the third voltage, the total resistance voltage drop and the voltage drop affected by the dead time. That is, through the above equations (2), (6) and (7), it can be obtained:

[0105]

[0106] Among them, U this the threshold voltage.

[0107] In one embodiment, the on-state voltage drop of the power tube is obtained according to the threshold voltage and the on-state resistance, including: obtaining the voltage drop when the third current passes through the on-state resistance according to the on-state resistance and the third current; obtaining the on-state voltage drop of the power tube according to the voltage drop when the third current passes through the on-state resistance and the threshold voltage.

[0108] The on-resistance can be obtained by equation (5) and the load impedance.

[0109] According to formula (1), when the current flowing through the on-resistance is the third current, it can be known that:

[0110] Power tube conduction voltage drop U d =U th +I 3 ×R on (14)

[0111] Combining equations (13) and (14), we can get the power tube conduction voltage drop U d .

[0112] In this embodiment, without increasing the hardware structure, the threshold voltage and on-resistance of the inverter bridge power tube are accurately learned, providing a size basis for realizing accurate compensation of the on-voltage drop of the inverter bridge power tube.

[0113] It should be noted that the calculation of the total resistance by the first voltage, the second voltage, the first current and the second current in this embodiment is only an example, and the total resistance can also be calculated by other methods mentioned above. For example, when the calculation is performed by the first voltage, the third voltage, the first current and the third current, one set of currents can be reduced and the second voltage corresponding to the second current does not need to be collected, thereby simplifying the detection method.

[0114] It should be noted that, since the device manual only contains the on-state voltage drop under specific operating temperature, driving voltage and other conditions, the above embodiments can also solve the problem that it is not only inconvenient but also the data is incomplete when obtaining the on-state voltage drop by checking the device manual.

[0115] Since the on-state voltage drop of the power tube is related to both temperature and driving voltage, the verification results of the whole machine cannot be compared and analyzed with the device manual. Therefore, this method is used to verify the effect on a semi-physical simulation platform.

[0116] The verification idea is: set different threshold voltages, as long as the learned threshold voltage is basically consistent with the set threshold voltage, the effectiveness of the learning method is proved; set different on-resistances, as long as the learned resistance is basically consistent with the set on-resistance, the effectiveness of the learning method can be proved. The results of verifying the threshold voltage are shown in Table 1, and the results of verifying the on-resistance are shown in Table 2.

[0117] Table 1

[0118] Set threshold voltage: V 0.5 1 1.5 2 Learning threshold voltage: V 0.497 0.994 1.493 1.987

[0119] Table 2

[0120] Set on-resistance: mΩ 30 50 80 100 Learning on-resistance: mΩ 29.7 50.2 79.9 100.2

[0121] After the above verification, the learning threshold voltage is basically the same as the setting threshold voltage, and the learning on-resistance is basically the same as the setting on-resistance, which can prove the effectiveness of this method.

[0122] Based on the same technical concept, the second embodiment of the present application provides a power tube conduction voltage drop detection device, such as Figure 7 , the device comprises:

[0123] A first acquisition module 701 is used to respectively set a first current, a second current and a third current of an input inverter bridge in a first carrier cycle, and respectively acquire a first voltage corresponding to the first current, a second voltage corresponding to the second current and a third voltage corresponding to the third current;

[0124] A second acquisition module 702, configured to acquire a fourth voltage corresponding to the third current in a second carrier cycle;

[0125] The calculation module 703 is used to obtain the power tube conduction voltage drop according to the first voltage, the second voltage, the third voltage, the fourth voltage, the first current, the second current, the third current, the first carrier period, the second carrier period and the load impedance.

[0126] The power tube conduction voltage drop detection device can adapt to various power levels, and can accurately detect the power tube conduction voltage drop when the power tube conduction voltage drop changes due to different operating temperatures and driving voltages. In addition, it only needs to detect the current and voltage parameters under different carrier cycles, combined with the known load impedance, to obtain the accurate power tube conduction voltage drop, which provides a basis for accurate compensation, and does not require additional hardware resources. The detection method is simple and convenient. The device manual only contains the conduction voltage drop under specific operating temperature, driving voltage and other conditions. The power tube conduction voltage drop detection device also overcomes the problem that it is not only inconvenient to obtain the conduction voltage drop by checking the device manual, but also the data is not comprehensive.

[0127] like Figure 8 As shown, the third embodiment of the present application provides an electronic device, including a processor 111, a communication interface 112, a memory 113 and a communication bus 114, wherein the processor 111, the communication interface 112, and the memory 113 communicate with each other through the communication bus 114.

[0128] Memory 113, used for storing computer programs;

[0129] In one embodiment, the processor 111 is used to execute the program stored in the memory 113 to implement the power tube conduction voltage drop detection method provided by any one of the above method embodiments, including:

[0130] In a first carrier cycle, a first current, a second current and a third current are respectively set to input the inverter bridge, and a first voltage corresponding to the first current, a second voltage corresponding to the second current and a third voltage corresponding to the third current are respectively obtained;

[0131] Under a second carrier cycle, obtaining a fourth voltage corresponding to the third current;

[0132] A power tube conduction voltage drop is obtained according to the first voltage, the second voltage, the third voltage, the fourth voltage, the first current, the second current, the third current, the first carrier cycle, the second carrier cycle and the load impedance.

[0133] The communication bus mentioned in the above terminal can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0134] The communication interface is used for communication between the above terminal and other devices.

[0135] The memory may include a random access memory (RAM) or a non-volatile memory, such as at least one disk memory. Optionally, the memory may also be at least one storage device located away from the aforementioned processor.

[0136] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0137] The fourth embodiment of the present application further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the power tube conduction voltage drop detection method provided in any of the aforementioned method embodiments are implemented.

[0138] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive Solid State Disk (SSD)), etc.

[0139] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0140] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In the description, the use of suffixes such as "module", "component" or "unit" used to represent elements is only to facilitate the description of the present invention and has no specific meaning in itself. Therefore, "module", "component" or "unit" can be used in a mixed manner.

[0141] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for detecting the on-state voltage drop of a power tube, It is characterized in that The method comprises: In a first carrier cycle, a first current, a second current and a third current are respectively set to input the inverter bridge, and a first voltage corresponding to the first current, a second voltage corresponding to the second current and a third voltage corresponding to the third current are respectively obtained; Under a second carrier cycle, obtaining a fourth voltage corresponding to the third current; A power tube conduction voltage drop is obtained according to the first voltage, the second voltage, the third voltage, the fourth voltage, the first current, the second current, the third current, the first carrier cycle, the second carrier cycle and the load impedance.

2. The method according to claim 1, It is characterized in that Obtaining a power tube conduction voltage drop according to the first voltage, the second voltage, the third voltage, the fourth voltage, the first current, the second current, the third current, the first carrier cycle, the second carrier cycle, and load impedance, including: A total resistance is obtained according to the first voltage, the second voltage, the first current and the second current; a total resistance voltage drop is obtained according to the third current and the total resistance; wherein the total resistance voltage drop is proportional to the third current, proportional to the first difference, and inversely proportional to the second difference; the first difference is the difference between the first voltage and the second voltage, and the second difference is the difference between the first current and the second current; A voltage drop affected by the dead time is obtained according to the third voltage, the fourth voltage, the first carrier period, and the second carrier period; wherein the voltage drop affected by the dead time is proportional to the second carrier period, proportional to the third difference, and inversely proportional to the fourth difference; the third difference is the difference between the third voltage and the fourth voltage, and the fourth difference is the difference between the second carrier period and the first carrier period; A threshold voltage is obtained according to the third voltage, the total resistance voltage drop and the voltage drop affected by the dead time; wherein the threshold voltage is the difference between the fifth difference and the voltage drop affected by the dead time; and the fifth difference is the difference between the third voltage and the total resistance voltage drop; The on-resistance is obtained according to the total resistance and the load impedance, and the on-voltage drop of the power tube is obtained according to the threshold voltage and the on-resistance.

3. The method according to claim 1, It is characterized in that The first current is smaller than the second current, and the second current is smaller than the third current; respectively obtaining a first voltage corresponding to the first current, a second voltage corresponding to the second current, and a third voltage corresponding to the third current, including: Obtaining a first voltage corresponding to the first current being stably output for a first time period; Obtaining a second voltage corresponding to the second current being stably output for a second period of time; A third voltage corresponding to the third current being stably output for a third period of time is obtained.

4. The method according to claim 2, It is characterized in that Obtaining a total resistance according to the first voltage, the second voltage, the first current, and the second current; and obtaining a total resistance voltage drop according to the third current and the total resistance, including: Among them, I 1 is the first current, I 2 is the second current, I 3 is the third current, U 1 is the first voltage, U 2 is the second voltage.

5. The method according to claim 4, It is characterized in that Obtaining a voltage drop affected by the dead time according to the third voltage, the fourth voltage, the first carrier period, and the second carrier period, includes: Among them, U dt1 is the voltage drop affected by the dead time in the first carrier cycle, U 3 is the third voltage, U 4 is the fourth voltage, P rd1 is the first carrier cycle, P rd2 is the second carrier cycle.

6. The method according to claim 5, It is characterized in that Obtaining a threshold voltage according to the third voltage, the total resistance voltage drop, and the voltage drop affected by the dead time, including: Among them, U th is the threshold voltage.

7. The method according to claim 6, It is characterized in that Obtaining a power tube on-state voltage drop according to the threshold voltage and the on-state resistance includes: Obtaining, according to the on-resistance and the third current, a voltage drop when the third current passes through the on-resistance; The on-state voltage drop of the power tube is obtained according to the voltage drop when the third current passes through the on-state resistor and the threshold voltage.

8. A power tube conduction voltage drop detection device, It is characterized in that The device comprises: A first acquisition module is used to respectively set a first current, a second current and a third current of an input inverter bridge under a first carrier cycle, and to respectively acquire a first voltage corresponding to the first current, a second voltage corresponding to the second current and a third voltage corresponding to the third current; A second acquisition module, used for acquiring a fourth voltage corresponding to the third current in a second carrier cycle; A calculation module is used to obtain a power tube conduction voltage drop according to the first voltage, the second voltage, the third voltage, the fourth voltage, the first current, the second current, the third current, the first carrier period, the second carrier period and the load impedance.

9. An electronic device, It is characterized in that It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; Memory, used to store computer programs; A processor, for implementing the steps of the power tube conduction voltage drop detection method as described in any one of claims 1 to 7 when executing a program stored in a memory.

10. A computer-readable storage medium having a computer program stored thereon, It is characterized in that When the computer program is executed by a processor, the steps of the power tube conduction voltage drop detection method as described in any one of claims 1 to 7 are implemented.

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