A transformer control method, device, apparatus, and storage medium

Abstract

The application discloses a converter control method, device and equipment and a storage medium, and belongs to the technical field of converter control, and the method comprises the following steps: determining a target mode group from candidate mode groups according to a target output voltage and an expected voltage; wherein the target output voltage refers to the output voltage of a dual active full-bridge converter; determining a target boundary slope corresponding to the target mode group from candidate boundary slopes; determining a target working mode from the target mode group according to the target output voltage, the expected voltage, the target boundary slope and a target inductor current; and controlling the dual active full-bridge converter to stably operate in the target working mode under a constant power load according to the target working mode. The application realizes large signal stability of the dual active full-bridge converter under the constant power load.

Description

Technical Field

[0001] This invention relates to the field of converter control technology, and in particular to a converter control method, apparatus, device, and storage medium. Background Technology

[0002] Compared to traditional non-isolated DC-DC converters, isolated bidirectional DC-DC converters are widely used in personal electronics, power systems, and hybrid electric vehicles (HEVs). As one type of isolated bidirectional DC-DC converter, the dual active full-bridge converter serves as a power interface between the DC link and renewable energy sources, offering numerous advantages such as electrical isolation, fewer passive components, high reliability, high power density, bidirectional energy flow, and high power efficiency due to zero-voltage switching (ZVS).

[0003] However, the large-signal stability problem of dual active full-bridge converters under constant power load remains an urgent issue to be addressed. Summary of the Invention

[0004] This invention provides a converter control method, apparatus, device, and storage medium to achieve large-signal stability of a dual active full-bridge converter under constant power load.

[0005] According to one aspect of the present invention, a converter control method is provided, the method comprising:

[0006] Based on the target output voltage and the desired voltage, the target mode group is determined from the candidate mode group; where the target output voltage refers to the output voltage of the dual active full-bridge converter.

[0007] Determine the target boundary slope corresponding to the target mode group from the candidate boundary slopes;

[0008] The target operating mode is determined from the target mode group based on the target output voltage, desired voltage, target boundary slope, and target inductor current.

[0009] Based on the target operating mode, control the dual active full-bridge converter to operate stably under constant power load in the target operating mode.

[0010] According to another aspect of the present invention, a converter control device is provided, the device comprising:

[0011] The target mode group determination module is used to determine the target mode group from the candidate mode groups based on the target output voltage and the desired voltage; wherein, the target output voltage refers to the output voltage of the dual active full-bridge converter;

[0012] The target boundary slope determination module is used to determine the target boundary slope corresponding to the target mode group from the candidate boundary slopes.

[0013] The target operating mode determination module is used to determine the target operating mode from the target mode group based on the target output voltage, desired voltage, target boundary slope, and target inductor current.

[0014] The converter control module is used to control the dual active full-bridge converter to operate stably under constant power load in the target operating mode according to the target operating mode.

[0015] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0016] At least one processor; and

[0017] A memory that is communicatively connected to at least one processor; wherein,

[0018] The memory stores a computer program that can be executed by at least one processor, such that the at least one processor is able to perform the converter control method of any embodiment of the present invention.

[0019] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement the converter control method of any embodiment of the present invention.

[0020] The technical solution of this invention determines a target mode group from a candidate mode group based on the target output voltage and the desired voltage; wherein, the target output voltage refers to the output voltage of the dual active full-bridge converter; the target boundary slope corresponding to the target mode group is determined from the candidate boundary slopes; the target operating mode is determined from the target mode group based on the target output voltage, the desired voltage, the target boundary slope, and the target inductor current; and the dual active full-bridge converter is controlled to operate stably under constant power load in the target operating mode according to the target operating mode. This technical solution, while ensuring stable operation of the dual active full-bridge converter under constant power load, achieves large-signal stability of the dual active full-bridge converter under constant power load, shortens the start-up transient time of the dual active full-bridge converter, and allows the output voltage of the dual active full-bridge converter to reach the desired voltage more quickly.

[0021] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1A This is a flowchart of a converter control method provided according to Embodiment 1 of the present invention;

[0024] Figure 1B The equivalent circuit diagram of the dual active full-bridge converter provided in Embodiment 1 of the present invention under four operating modes;

[0025] Figure 2A This is a flowchart of a converter control method provided according to Embodiment 2 of the present invention;

[0026] Figure 2B This is a schematic diagram of the time-domain waveform and trajectory phase plane of a dual active full-bridge converter during the startup process of a conventional single-direction control method provided in Embodiment 2 of the present invention.

[0027] Figure 2C This is a schematic diagram of the time-domain waveform and trajectory phase plane during the startup process of the dual active full-bridge converter of the present invention, provided in Embodiment 2 of the present invention;

[0028] Figure 2D This is a schematic diagram showing the change in output voltage of the dual active full-bridge converter provided in Embodiment 2 of the present invention from 100V to 150V.

[0029] Figure 3A This is a flowchart of a converter control method provided according to Embodiment 3 of the present invention;

[0030] Figure 3B This is a schematic diagram of the voltage and current stability range of the target mode group provided in Embodiment 3 of the present invention;

[0031] Figure 3C This is a schematic diagram of the stable operation trajectory of the dual active full-bridge converter provided in Embodiment 3 of the present invention under constant power load in the target operating mode;

[0032] Figure 4 This is a schematic diagram of the structure of a converter control device according to Embodiment 4 of the present invention;

[0033] Figure 5 This is a schematic diagram of the structure of an electronic device that implements the converter control method of the present invention. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "objective," "expected," "first," and "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0036] Furthermore, it should be noted that the collection, storage, use, processing, transmission, provision, and disclosure of the target output voltage, target inductor current, and target current involved in the technical solution of the present invention all comply with the provisions of relevant laws and regulations and do not violate public order and good morals.

[0037] Example 1

[0038] Figure 1A This is a flowchart of a converter control method provided in Embodiment 1 of the present invention. This embodiment is applicable to the control of converters, especially to the control of dual active full-bridge converters under constant power loads. This method can be executed by a converter control device, which can be implemented in hardware and / or software and can be configured in electronic equipment. Figure 1A As shown, the method includes:

[0039] S101. Determine the target mode group from the candidate mode group based on the target output voltage and the desired voltage; where the target output voltage refers to the output voltage of the dual active full-bridge converter.

[0040] The target output voltage can be obtained through a voltage sensor. The desired voltage is the voltage expected to be output by the dual active full-bridge converter; optionally, the desired voltage can be preset according to actual business needs, for example, the desired voltage can be 5V, but this embodiment of the invention does not specifically limit it. The candidate mode group refers to the selectable mode group; optionally, the candidate mode group includes a first mode group and a second mode group; wherein, the first mode group includes a first operating mode and a fourth operating mode; the second mode group includes a second operating mode and a third operating mode. The first, second, third, and fourth operating modes are the four operating modes of the dual active full-bridge converter.

[0041] Optionally, the equivalent circuit diagram and state equations of the dual active full-bridge converter under the above four operating modes can be determined by analyzing the operating principle of the dual active full-bridge converter. See [link to relevant documentation]. Figure 1B . Figure 1B In the diagram, (a) is the equivalent circuit diagram of the dual active full-bridge converter in the first operating mode, (b) is the equivalent circuit diagram of the dual active full-bridge converter in the second operating mode, (c) is the equivalent circuit diagram of the dual active full-bridge converter in the third operating mode, and (d) is the equivalent circuit diagram of the dual active full-bridge converter in the fourth operating mode. Figure 1B S1-S8 in the diagram are switching devices, V in C0 is the input voltage, C1 is the output capacitor, and C1 is the input capacitor. ab V is the voltage across the primary side of the dual active full-bridge converter, L is the inductance, and v is the voltage across the primary side. cb V0 is the voltage across the secondary side of the dual active full-bridge converter, and i is the output voltage. L This refers to the inductor current, specifically the current flowing through the inductor in the dual active full-bridge converter. Correspondingly, based on the equivalent circuit diagrams of the dual active full-bridge converter in each operating mode, and grounded in Kirchhoff's voltage and current laws, the state equations of the dual active full-bridge converter in each operating mode can be obtained:

[0042] The first state equation of the dual active full-bridge converter in the first operating mode is as follows:

[0043]

[0044] Where x1 is the inductor current (i.e., the inductor current i in the dual active full-bridge converter). L x2 is the output voltage (i.e., the output voltage V0 in the dual active full-bridge converter), L is the inductance, and V in C0 is the input voltage, C0 is the output capacitor, and P is the output capacitor. out This refers to the output power.

[0045] The second state equation of the dual active full-bridge converter in the second operating mode is as follows:

[0046]

[0047] The third state equation of the dual active full-bridge converter in the third operating mode is as follows:

[0048]

[0049] The fourth state equation of the dual active full-bridge converter in the fourth operating mode is as follows:

[0050]

[0051] It should be noted that if the operating modes of a dual active full-bridge converter are fixed, its state equations are also fixed, that is, one operating mode corresponds to one state equation.

[0052] The target mode group refers to the mode group actually selected by the dual active full-bridge converter.

[0053] Specifically, the target output voltage and desired voltage can be used as inputs to the mode group screening model. The model processes the data to determine the target mode group from the candidate mode groups. The mode group screening model can be pre-set according to actual business needs; this embodiment of the invention does not impose specific limitations on it.

[0054] Optionally, the voltage difference between the target output voltage and the desired voltage can be used as the first target voltage; if the first target voltage is greater than the voltage threshold, the first mode group is selected from the candidate mode group as the target mode group; if the target voltage is less than or equal to the voltage threshold, the second mode group is selected from the candidate mode group as the target mode group.

[0055] The voltage threshold can be preset according to actual business needs. For example, the voltage threshold can be 0V. This embodiment of the invention does not specifically limit it.

[0056] For example, if the voltage threshold is 0V, the first target voltage can be determined using the following formula:

[0057] v = V0 - v ref

[0058] Where v is the first target voltage, V0 is the target output voltage, and v ref This is the desired voltage.

[0059] Then, when v>0, a first mode group is selected from the candidate mode group as the target mode group; wherein, the first mode group includes the first working mode and the fourth working mode; when v≤0, a second mode group is selected from the candidate mode group as the target mode group; wherein, the second mode group includes the second working mode and the third working mode.

[0060] It is understandable that by comparing the voltage difference between the target output voltage and the desired voltage (i.e., the first target voltage) with the voltage threshold, the position of the target output voltage relative to the desired voltage at the current moment can be clearly determined. That is, if the first target voltage is greater than the voltage threshold, it means that the target output voltage at the current moment is to the right of the desired voltage; otherwise, it means that the target output voltage at the current moment is to the left of the desired voltage. This makes it easier to determine the target mode group of the dual active full-bridge converter more accurately.

[0061] S102. Determine the target boundary slope corresponding to the target mode group from the candidate boundary slopes.

[0062] Here, the candidate boundary slope refers to the boundary slope that can be selected; optionally, the candidate boundary slope may include a first boundary slope and a second boundary slope; wherein the first boundary slope and the second boundary slope are opposites of each other. The target boundary slope refers to the boundary slope actually selected by the dual active full-bridge converter.

[0063] Specifically, the target boundary slope corresponding to the target mode group can be determined from the candidate boundary slopes through experiments.

[0064] For example, if the slope of the first boundary is less than 0, the slope of the second boundary is greater than 0; if the target mode group is the first mode group, the target boundary slope corresponding to the target mode group is determined to be the second boundary slope from the candidate boundary slopes through experimental verification; if the target mode group is the second mode group, the target boundary slope corresponding to the target mode group is determined to be the first boundary slope from the candidate boundary slopes through experimental verification.

[0065] S103. Determine the target operating mode from the target mode group based on the target output voltage, desired voltage, target boundary slope, and target inductor current.

[0066] The target inductor current refers to the current flowing through the inductor in the dual active full-bridge converter. The target operating mode refers to the actual operating mode of the dual active full-bridge converter.

[0067] Specifically, the target output voltage, desired voltage, target boundary slope, and target inductor current can be input into the operating mode determination model. After processing by the operating mode determination model, the target operating mode is determined from the target mode group. The operating mode determination model can be pre-set according to actual business needs, and this embodiment of the invention does not impose specific limitations on it.

[0068] S104. Based on the target operating mode, control the dual active full-bridge converter to operate stably under constant power load in the target operating mode.

[0069] Specifically, based on the target operating mode, the dual active full-bridge converter can be controlled to operate stably within the voltage and current stability range under the target operating mode of constant power load. The voltage and current stability range refers to the range within which the target inductor current and target output voltage of the dual active full-bridge converter are stably output.

[0070] The technical solution of this invention determines a target mode group from a candidate mode group based on the target output voltage and the desired voltage; wherein, the target output voltage refers to the output voltage of the dual active full-bridge converter; the target boundary slope corresponding to the target mode group is determined from the candidate boundary slopes; the target operating mode is determined from the target mode group based on the target output voltage, the desired voltage, the target boundary slope, and the target inductor current; and the dual active full-bridge converter is controlled to operate stably under constant power load in the target operating mode according to the target operating mode. This technical solution, while ensuring stable operation of the dual active full-bridge converter under constant power load, achieves large-signal stability of the dual active full-bridge converter under constant power load, shortens the start-up transient time of the dual active full-bridge converter, and allows the output voltage of the dual active full-bridge converter to reach the desired voltage more quickly.

[0071] Example 2

[0072] Figure 2A This is a flowchart of a converter control method provided in Embodiment 2 of the present invention. Based on the above embodiments, this embodiment further optimizes the step of "determining the target operating mode from the target mode group based on the target output voltage, desired voltage, target boundary slope, and target inductor current," providing an optional implementation scheme. It should be noted that parts not detailed in this embodiment can be referred to in the relevant descriptions of other embodiments. For example... Figure 2A As shown, the method includes:

[0073] S201. Determine the target mode group from the candidate mode group based on the target output voltage and the desired voltage; where the target output voltage refers to the output voltage of the dual active full-bridge converter.

[0074] Here, the candidate mode group refers to the mode group that can be selected; optionally, the candidate mode group includes a first mode group and a second mode group; wherein, the first mode group includes a first working mode and a fourth working mode; and the second mode group includes a second working mode and a third working mode.

[0075] S202. Determine the target boundary slope corresponding to the target mode group from the candidate boundary slopes.

[0076] S203. The voltage change between the target output voltage and the desired voltage is taken as the second target voltage.

[0077] The second target voltage refers to the voltage change between the target output voltage and the desired voltage.

[0078] Specifically, the second target voltage can be determined based on the target output voltage and the desired voltage using the following formula:

[0079] d = |V0 - v ref |

[0080] Where d is the second target voltage, V0 is the target output voltage, and v ref This is the desired voltage.

[0081] S204. Determine the boundary current based on the target output voltage, desired voltage, and target boundary slope.

[0082] The boundary current refers to the inductor current at the intersection of the boundary line and the voltage-current trajectory curve of the dual active full-bridge converter. The boundary line controls the direction of change in the voltage-current trajectory of the dual active full-bridge converter. The voltage-current trajectory curve is a curve used to reflect the real-time changes in the inductor current and output voltage of the dual active full-bridge converter.

[0083] Specifically, the boundary current can be determined based on the sign of the target boundary slope, as well as the target output voltage and the desired voltage. For example, if the target boundary slope is negative (less than 0), the boundary current can be determined using the following formula based on the target output voltage, the desired voltage, and the target boundary slope:

[0084] i β =kV0+v ref

[0085] If the target boundary slope is positive, i.e., greater than 0, then the boundary current is determined using the following formula based on the target output voltage, the desired voltage, and the target boundary slope:

[0086] i β =kV0-v ref

[0087] Among them, i β Let k be the boundary current, k be the target boundary slope, V0 be the target output voltage, and v be the target boundary current. ref This is the desired voltage.

[0088] S205. When the second target voltage is greater than the reference voltage, determine the target operating mode from the target mode group based on the boundary current and the target inductor current.

[0089] The reference voltage refers to the maximum output voltage variation that is preset.

[0090] Specifically, when the second target voltage is greater than the reference voltage, the target operating mode is determined from the target mode group based on the operating mode determination rules, according to the boundary current and the target inductor current. The operating mode determination rules can be preset according to actual business needs, and this embodiment of the invention does not impose specific limitations on them.

[0091] Optionally, if the second target voltage is greater than the reference voltage, the target inductor current can be compared with the reference current to obtain a first comparison result; based on the first comparison result and the boundary current, the target operating mode can be determined from the target mode group.

[0092] The reference current refers to the maximum inductor current that is preset.

[0093] Specifically, when the second target voltage is greater than the reference voltage, the target inductor current is compared with the reference current to obtain a first comparison result; if the first comparison result is that the target inductor current is greater than or equal to the reference current, and the target mode group is the first mode group, then the target operating mode is determined to be the first operating mode; if the first comparison result is that the target inductor current is greater than or equal to the reference current, and the target mode group is the second mode group, then the target operating mode is determined to be the third operating mode; if the first comparison result is that the target inductor current is less than the reference current, the target inductor current is compared with the boundary current to obtain a second comparison result; based on the second comparison result, the target operating mode is determined from the target mode group.

[0094] More specifically, if the first comparison result is that the target inductor current is less than the reference current, then the target inductor current is further compared with the boundary current to obtain a second comparison result; if the second comparison result is that the target inductor current is greater than the boundary current, and the target mode group is the first mode group, then the target operating mode is determined to be the first operating mode; if the second comparison result is that the target inductor current is greater than the boundary current, and the target mode group is the second mode group, then the target operating mode is determined to be the third operating mode; if the second comparison result is that the target inductor current is less than or equal to the boundary current, and the target mode group is the first mode group, then the target operating mode is determined to be the fourth operating mode; if the second comparison result is that the target inductor current is less than or equal to the boundary current, and the target mode group is the second mode group, then the target operating mode is determined to be the second operating mode.

[0095] Optionally, if the second target voltage is less than or equal to the reference voltage, no further operation is performed. In this case, the dual active full-bridge converter is already operating stably under constant power load.

[0096] S206. Based on the target operating mode, control the dual active full-bridge converter to operate stably under constant power load in the target operating mode.

[0097] The technical solution of this invention, by comparing the voltage change between the target output voltage and the desired voltage (i.e., the second target voltage) with the reference voltage, can clearly determine whether the change in the output voltage of the dual active full-bridge converter falls within a preset range. This facilitates the determination of subsequent operations to ensure stable operation of the dual active full-bridge converter under a constant power load. Specifically, if the change in the output voltage of the dual active full-bridge converter falls within the preset range, it indicates that the dual active full-bridge converter is operating stably under a constant power load, and its output voltage can reach the desired voltage. If the change in the output voltage of the dual active full-bridge converter does not fall within the preset range, the operating mode of the dual active full-bridge converter is further switched by comparing the target inductor current with the reference current and by comparing the target inductor current with the boundary current, so that the large signal of the dual active full-bridge converter reaches a stable state more quickly under a constant power load.

[0098] Furthermore, based on the time-domain waveforms during the startup process of a dual active full-bridge converter using the traditional Single Phase Shift (SPS) method, see [reference needed]. Figure 2B (a) in the diagram, and the trajectory phase plane, see [reference]. Figure 2B (b) in the figure; and the time-domain waveform during the startup process of the dual active full-bridge converter of the present invention, see also (b). Figure 2C (a) in the diagram, and the trajectory phase plane, see [reference]. Figure 2C In section (b), it can be intuitively observed that, compared to the traditional SPS method, this invention ensures the stable operation of the dual active full-bridge converter under constant power load in the target operating mode. Furthermore, by comparing the transient time of the output voltage change from 100V to 150V between the traditional SPS method and the dual active full-bridge converter of this invention, see [reference needed]. Figure 2D From t1 in (a) and t2 in (b), we can see that t1>t2. That is, compared with the traditional SPS method, the technical solution of this invention shortens the transient time of the output voltage change of the dual active full-bridge converter, thereby shortening the start-up transient time of the dual active full-bridge converter.

[0099] It should be noted that, Figure 2B (a) and Figure 2C The output voltage of the dual active full-bridge converter in (a) is 100V, i.e., V0 = 100V, and the voltage across the primary side of the dual active full-bridge converter is 200V, i.e., v ab =200V, the voltage across the secondary side of the dual active full-bridge converter is 200V, i.e., v cd =200V, the inductor current of the dual active full-bridge converter is 5A, i. L =5A.

[0100] It should be noted that, Figure 2B(b) and Figure 2C The output voltage of the dual active full-bridge converters in (b) is 20V, i.e., V0 = 20V, and the inductor current of the dual active full-bridge converters is 5A, i.e., i L =5A.

[0101] It should be noted that, Figure 2D (a) is a schematic diagram showing the output voltage change of the traditional SPS dual active full-bridge converter from 100V to 150V, and (b) is a schematic diagram showing the output voltage change of the dual active full-bridge converter of the present invention from 100V to 150V. Figure 2D The primary voltage of the dual active full-bridge converters in (a) and (b) is 200V, i.e., v ab =200V, the voltage across the secondary side of the dual active full-bridge converter is 200V, i.e., v cd =200V, the inductor current of the dual active full-bridge converter is 10A, i L =10A, V0 in the figure is the output voltage, t1 is the transient time of the output voltage of the dual active full-bridge converter of the traditional SPS method changing from 100V to 150V, and t2 is the transient time of the output voltage of the dual active full-bridge converter of the present invention changing from 100V to 150V.

[0102] Example 3

[0103] Figure 3A This is a flowchart of a converter control method provided in Embodiment 3 of the present invention. Based on the above embodiments, this embodiment further optimizes the step of "determining the target boundary slope corresponding to the target mode group from candidate boundary slopes," providing an optional implementation scheme. It should be noted that parts not detailed in this embodiment can be referred to in the relevant descriptions of other embodiments. For example... Figure 3A As shown, the method includes:

[0104] S301. Determine the target mode group from the candidate mode group based on the target output voltage and the desired voltage; where the target output voltage refers to the output voltage of the dual active full-bridge converter.

[0105] Here, the candidate mode group refers to the mode group that can be selected; optionally, the candidate mode group includes a first mode group and a second mode group; wherein, the first mode group includes a first working mode and a fourth working mode; and the second mode group includes a second working mode and a third working mode.

[0106] S302. Determine the voltage and current stability range of the target mode group based on the target output voltage, desired voltage, target inductor current, and desired current.

[0107] Here, the desired current refers to the inductor current expected to be output by the dual active full-bridge converter. Optionally, the desired current can be preset according to actual business needs; for example, the desired current can be 0A. This embodiment of the invention does not impose specific limitations on it. The voltage and current stability range refers to the range within which the target inductor current and target output voltage of the dual active full-bridge converter are stably output.

[0108] Specifically, the input voltage, output power, inductance, and output capacitance of the dual active full-bridge converter can be obtained; based on the input voltage, output power, inductance, output capacitance, target output voltage, desired voltage, target inductor current, and desired current, the transition point trajectory of the dual active full-bridge converter in any operating mode of the target mode group can be determined; based on the above transition point trajectory and the positive definite decreasing analogue function, the voltage and current stability range of the target mode group can be determined.

[0109] For example, if the target mode group is the first mode group; obtain the input voltage, output power, inductance, and output capacitance of the dual active full-bridge converter;

[0110] Subsequently, for the first operating mode, based on the input voltage, output power, inductance, output capacitance, target output voltage, desired voltage, target inductor current, and desired current, the transition point trajectory of the dual active full-bridge converter in the first operating mode is determined using the following formula:

[0111]

[0112] Among them, V in P is the input voltage. out x2 is the output power, L is the inductance, C0 is the output capacitor, x2 is the target output voltage (i.e., the output voltage V0 in the dual active full-bridge converter), and v ref x1 is the desired voltage, and x1 is the target inductor current (i.e., the inductor current i in the dual active full-bridge converter). L ), i ref This represents the desired current.

[0113] Furthermore, based on the above formula, the transition point trajectory of the dual active full-bridge converter in the first operating mode is obtained, namely:

[0114] σ1(x):L[-x1 2 x2+x1x2i ref -P out x1+P out i ref ]-C0[V in x2 2 +x2 3 -V in v ref x2-x2 2 v ref ] = 0

[0115] For the fourth operating mode, based on the input voltage, output power, inductance, output capacitance, target output voltage, desired voltage, target inductor current, and desired current, the transition point trajectory of the dual active full-bridge converter in the fourth operating mode is determined by the following formula:

[0116]

[0117] Furthermore, based on the above formula, the transition point trajectory of the dual active full-bridge converter in the fourth operating mode is obtained, namely:

[0118] σ4(x):L[-x1 2 x2+x1x2i ref -P out x1+P out i ref ]-C0[-V in x2 2 +x2 3 +V in v ref x2-x2 2 v ref ] = 0

[0119] Furthermore, based on the transition point trajectories and positive definite decreasing energy analogue functions of the dual active full-bridge converter in the first and fourth operating modes, the voltage and current stability intervals of the target mode group are determined. More specifically, by substituting formula (1) into the expression (2) of the positive definite decreasing energy analogue function and differentiating the positive definite decreasing energy analogue function, the voltage and current stability intervals of the target mode group (i.e., the first mode group) are determined:

[0120] x1=k(x2-v ref )+i ref (1)

[0121] V(x) = ||xx ref || 2 >0 (2)

[0122] Where k is the slope of the target boundary, x ref Represents the relevant data for the expected point. If x is x1, then x ref =i ref If x is x², then x ref =v ref By differentiating the positive definite decreasing class function, the following expression is obtained for the target mode group (i.e., the first mode group):

[0123]

[0124] Furthermore, we can obtain Figure 3BThe voltage and current stability range shown in (a) is when the target mode group is the first mode group. Here, x1 is the target inductor current (i.e., the inductor current i in the dual active full-bridge converter). L x2 is the target output voltage (i.e., the output voltage V0 in the dual active full-bridge converter), σ1 is the first operating mode, and σ4 is the fourth operating mode.

[0125] For example, if the target mode group is the second mode group; obtain the input voltage, output power, inductance, and output capacitance of the dual active full-bridge converter;

[0126] Subsequently, for the second operating mode, based on the input voltage, output power, inductance, output capacitance, target output voltage, desired voltage, target inductor current, and desired current, the transition point trajectory of the dual active full-bridge converter in the second operating mode is determined using the following formula:

[0127]

[0128] Among them, V in P is the input voltage. out x2 is the output power, L is the inductance, C0 is the output capacitor, x2 is the target output voltage (i.e., the output voltage V0 in the dual active full-bridge converter), and v ref x1 is the desired voltage, and x1 is the target inductor current (i.e., the inductor current i in the dual active full-bridge converter). L ), i ref This represents the desired current.

[0129] Furthermore, based on the above formula, the transition point trajectory of the dual active full-bridge converter in the second operating mode is obtained, namely:

[0130] σ2(x):L[x1 2 x2-x1x2i ref -P out x1+P out i ref ]-C0[V in x2 2 -x2 3 -V in v ref x2+x2 2 v ref ] = 0

[0131] For the third operating mode, based on the input voltage, output power, inductance, output capacitance, target output voltage, desired voltage, target inductor current, and desired current, the transition point trajectory of the dual active full-bridge converter in the third operating mode is determined by the following formula:

[0132]

[0133] Furthermore, based on the above formula, the transition point trajectory of the dual active full-bridge converter in the third operating mode is obtained, namely:

[0134] σ3(x):L[x1 2 x2-x1x2i ref -P out x1+P out i ref ]-C0[-V in x2 2 -x2 3 +V in v ref x2+x2 2 v ref ] = 0

[0135] Furthermore, based on the transition point trajectories and positive definite decreasing energy analogue functions of the dual active full-bridge converter in the second and third operating modes, the voltage and current stability intervals of the target mode group are determined. More specifically, by substituting formula (1) into the expression (2) of the positive definite decreasing energy analogue function and differentiating the positive definite decreasing energy analogue function, the voltage and current stability intervals of the target mode group (i.e., the second mode group) are determined:

[0136] x1=k(x2-v ref )+i ref (1)

[0137] V(x) = ||xx ref || 2 >0 (2)

[0138] Where k is the slope of the target boundary, x ref This represents the relevant data for the expected point. If x is x1, then x ref =i ref If x is x², then x ref =v ref By differentiating the positive definite decreasing analogue function, the following expression is obtained for the target mode group (i.e., the second mode group):

[0139]

[0140] Furthermore, we can obtain Figure 3B The voltage and current stability range shown in (b) is when the target mode group is the second mode group. Here, x1 is the target inductor current (i.e., the inductor current i in the dual active full-bridge converter). L x2 is the target output voltage (i.e., the output voltage V0 in the dual active full-bridge converter), σ2 is the second operating mode, and σ3 is the third operating mode.

[0141] S303. Based on the stable voltage and current range, determine the target boundary slope corresponding to the target mode group from the candidate boundary slopes.

[0142] The candidate boundary slope refers to the boundary slope that can be selected; optionally, the candidate boundary slope may include a first boundary slope and a second boundary slope; wherein the first boundary slope and the second boundary slope are opposites of each other.

[0143] Specifically, the target boundary slope corresponding to the target mode group can be determined from the candidate boundary slopes through experimental verification within the voltage and current stability range of the target mode group.

[0144] For example, if the slope of the first boundary is less than 0 and the slope of the second boundary is greater than 0, the slope of the target boundary corresponding to the target mode group is determined to be the second boundary slope by experimental verification within the voltage and current stability range of the target mode group (i.e., the first mode group).

[0145] For example, if the slope of the first boundary is less than 0 and the slope of the second boundary is greater than 0, the target boundary slope corresponding to the target mode group (i.e., the second mode group) is determined to be the first boundary slope by passing through experiments within the voltage and current stability range of the target mode group (i.e., the second mode group).

[0146] S304. Determine the target operating mode from the target mode group based on the target output voltage, desired voltage, target boundary slope, and target inductor current.

[0147] S305. Based on the target operating mode, control the dual active full-bridge converter to operate stably under constant power load in the target operating mode.

[0148] For example, if the target operating mode is the first operating mode or the fourth operating mode, through Figure 3C In section (a), the boundary line corresponding to the slope of the target boundary controls the direction of change of the voltage and current trajectory curves of the dual active full-bridge converter, thereby controlling the dual active full-bridge converter to operate stably under constant power load in the target operating mode, and thus enabling the output voltage of the dual active full-bridge converter to reach the desired voltage. The voltage and current trajectory curves refer to the curves used to reflect the changes in inductor current and output voltage of the dual active full-bridge converter in real time. (See [reference needed]). Figure 3C The curve with direction in (a)

[0149] For example, if the target operating mode is the second or third operating mode, by Figure 3CIn section (b), the boundary line corresponding to the slope of the target boundary controls the direction of change of the voltage and current trajectory curves of the dual active full-bridge converter, thereby controlling the dual active full-bridge converter to operate stably under constant power load in the target operating mode, and thus enabling the output voltage of the dual active full-bridge converter to reach the desired voltage. The voltage and current trajectory curves refer to the curves used to reflect the changes in inductor current and output voltage of the dual active full-bridge converter in real time. See [reference needed]. Figure 3C (b) The curve with direction.

[0150] The technical solution of this invention determines the voltage and current stability range of the target mode group based on the target output voltage, desired voltage, target inductor current, and desired current; and determines the target boundary slope corresponding to the target mode group from candidate boundary slopes based on the voltage and current stability range. This technical solution, by determining the voltage and current stability range of the target mode group and further determining the target boundary slope corresponding to the target mode group, ensures stable operation of the dual active full-bridge converter under constant power load within the voltage and current stability range of the target mode group, while enabling the output voltage of the dual active full-bridge converter to reach the desired voltage more quickly.

[0151] Example 4

[0152] Figure 4 This is a schematic diagram of a converter control device provided in Embodiment 4 of the present invention. This embodiment is applicable to the control of converters, especially to the control of dual active full-bridge converters under constant power loads. The device can be implemented in hardware and / or software and can be configured in electronic devices. Figure 4 As shown, the device includes:

[0153] The target mode group determination module 401 is used to determine the target mode group from the candidate mode groups based on the target output voltage and the desired voltage; wherein, the target output voltage refers to the output voltage of the dual active full-bridge converter;

[0154] The target boundary slope determination module 402 is used to determine the target boundary slope corresponding to the target mode group from the candidate boundary slopes;

[0155] The target operating mode determination module 403 is used to determine the target operating mode from the target mode group based on the target output voltage, desired voltage, target boundary slope and target inductor current;

[0156] The converter control module 404 is used to control the dual active full-bridge converter to operate stably under constant power load in the target operating mode according to the target operating mode.

[0157] The technical solution of this invention determines a target mode group from a candidate mode group based on the target output voltage and the desired voltage; wherein, the target output voltage refers to the output voltage of the dual active full-bridge converter; the target boundary slope corresponding to the target mode group is determined from the candidate boundary slopes; the target operating mode is determined from the target mode group based on the target output voltage, the desired voltage, the target boundary slope, and the target inductor current; and the dual active full-bridge converter is controlled to operate stably under constant power load in the target operating mode according to the target operating mode. This technical solution, while ensuring stable operation of the dual active full-bridge converter under constant power load, achieves large-signal stability of the dual active full-bridge converter under constant power load, shortens the start-up transient time of the dual active full-bridge converter, and allows the output voltage of the dual active full-bridge converter to reach the desired voltage more quickly.

[0158] Optionally, the candidate mode group includes a first mode group and a second mode group; wherein, the first mode group includes a first working mode and a fourth working mode; and the second mode group includes a second working mode and a third working mode.

[0159] Optionally, the target mode group determination module 401 is specifically used for:

[0160] The voltage difference between the target output voltage and the desired voltage is taken as the first target voltage;

[0161] If the first target voltage is greater than the voltage threshold, the first mode group is selected from the candidate mode group as the target mode group;

[0162] If the first target voltage is less than or equal to the voltage threshold, a second mode group is selected from the candidate mode group as the target mode group.

[0163] Optionally, the target operating mode determination module 403 includes:

[0164] The second target voltage determination unit is used to take the voltage change between the target output voltage and the desired voltage as the second target voltage;

[0165] The boundary current determination unit is used to determine the boundary current based on the target output voltage, the desired voltage, and the target boundary slope.

[0166] The target operating mode determination unit is used to determine the target operating mode from the target mode group based on the boundary current and the target inductor current when the second target voltage is greater than the reference voltage.

[0167] Optionally, the target operating mode determination unit includes:

[0168] The first comparison result determination sub-unit is used to compare the target inductor current with the reference current to obtain the first comparison result;

[0169] The target operating mode determination sub-unit is used to determine the target operating mode from the target mode group based on the first comparison result and the boundary current.

[0170] Optionally, the target operating mode determination sub-unit is used for:

[0171] If the first comparison result is that the target inductor current is less than the reference current, then the target inductor current is compared with the boundary current to obtain the second comparison result;

[0172] Based on the second comparison result, the target working mode is determined from the target mode group.

[0173] Optionally, the target boundary slope determination module 402 is specifically used for:

[0174] Determine the voltage and current stability range of the target mode group based on the target output voltage, desired voltage, target inductor current, and desired current.

[0175] Based on the stable voltage and current range, the target boundary slope corresponding to the target mode group is determined from the candidate boundary slopes.

[0176] The converter control device provided in the embodiments of the present invention can execute the converter control method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects for executing each converter control method.

[0177] Example 5

[0178] Figure 5 A schematic diagram of an electronic device 10 that can be used to implement embodiments of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0179] like Figure 5As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 can also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0180] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0181] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as converter control methods.

[0182] In some embodiments, the converter control method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the converter control method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to execute the converter control method by any other suitable means (e.g., by means of firmware).

[0183] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0184] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0185] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0186] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0187] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0188] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0189] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0190] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A converter control method, characterized in that, include: Based on the target output voltage and the desired voltage, a target mode group is determined from the candidate mode group; wherein, the target output voltage refers to the output voltage of the dual active full-bridge converter; the candidate mode group includes a first mode group and a second mode group; the first mode group includes a first operating mode and a fourth operating mode; the second mode group includes a second operating mode and a third operating mode; Determine the target boundary slope corresponding to the target mode group from the candidate boundary slopes; The target operating mode is determined from the target mode group based on the target output voltage, the desired voltage, the target boundary slope, and the target inductor current. Based on the target operating mode, the dual active full-bridge converter is controlled to operate stably under constant power load in the target operating mode; The step of determining the target mode group from the candidate mode group based on the target output voltage and the desired voltage includes: The voltage difference between the target output voltage and the desired voltage is taken as the first target voltage; If the first target voltage is greater than the voltage threshold, the first mode group is selected from the candidate mode group as the target mode group; If the first target voltage is less than or equal to the voltage threshold, a second mode group is selected from the candidate mode group as the target mode group; The step of determining the target operating mode from the target mode group based on the target output voltage, the desired voltage, the target boundary slope, and the target inductor current includes: The voltage change between the target output voltage and the desired voltage is taken as the second target voltage; The boundary current is determined based on the target output voltage, the desired voltage, and the target boundary slope. When the second target voltage is greater than the reference voltage, the target inductor current is compared with the reference current to obtain the first comparison result; If the first comparison result is that the target inductor current is less than the reference current, then the target inductor current is compared with the boundary current to obtain a second comparison result; Based on the second comparison result, the target working mode is determined from the target mode group.

2. The method according to claim 1, characterized in that, Determining the target boundary slope corresponding to the target mode group from the candidate boundary slopes includes: The voltage and current stability range of the target mode group is determined based on the target output voltage, the desired voltage, the target inductor current, and the desired current. Based on the voltage and current stability range, the target boundary slope corresponding to the target mode group is determined from the candidate boundary slopes.

3. A converter control device, characterized in that, include: A target mode group determination module is used to determine a target mode group from a candidate mode group based on a target output voltage and a desired voltage; wherein, the target output voltage refers to the output voltage of the dual active full-bridge converter; the candidate mode group includes a first mode group and a second mode group; the first mode group includes a first operating mode and a fourth operating mode; the second mode group includes a second operating mode and a third operating mode; The target boundary slope determination module is used to determine the target boundary slope corresponding to the target mode group from the candidate boundary slopes; The target operating mode determination module is used to determine the target operating mode from the target mode group based on the target output voltage, the desired voltage, the target boundary slope, and the target inductor current. The converter control module is used to control the dual active full-bridge converter to operate stably under constant power load in the target operating mode according to the target operating mode. The target mode group determination module is specifically used for: The voltage difference between the target output voltage and the desired voltage is taken as the first target voltage; If the first target voltage is greater than the voltage threshold, the first mode group is selected from the candidate mode group as the target mode group; If the first target voltage is less than or equal to the voltage threshold, a second mode group is selected from the candidate mode group as the target mode group; The target operating mode determination module includes: The second target voltage determination unit is used to take the voltage change between the target output voltage and the desired voltage as the second target voltage; A boundary current determination unit is used to determine the boundary current based on the target output voltage, the desired voltage, and the target boundary slope. The target operating mode determination unit is used to compare the target inductor current with the reference current when the second target voltage is greater than the reference voltage to obtain a first comparison result; if the first comparison result is that the target inductor current is less than the reference current, then compare the target inductor current with the boundary current to obtain a second comparison result; and determine the target operating mode from the target mode group according to the second comparison result.

4. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the converter control method according to any one of claims 1-2.

5. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute the converter control method according to any one of claims 1-2.

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