Power conversion device, control method and vehicle

Abstract

The invention relates to a power conversion device, a control method and a vehicle, and relates to the technical field of power supplies. The power conversion device comprises a first connecting part, a plurality of converter groups and a second connecting part. And each second connecting part is used for being connected with at least one bus capacitor. The plurality of converter groups are connected with the same first connecting part, and each converter group is correspondingly connected with one second connecting part. Each converter group comprises a plurality of converter modules, and each converter module is connected with the first connecting part and the second connecting part corresponding to the converter group where the converter module is located so as to provide energy for the corresponding bus capacitor. Therefore, the energy of each second connecting part is transmitted to the corresponding bus capacitor, and each converter module in the converter group is connected with the first connecting part and the second connecting part corresponding to the converter group where the converter module is located, namely, all converter modules in the same converter group are connected in parallel. Therefore, the stress borne by the switching tube in the converter module during high-power output is reduced.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a power conversion device, a control method, and a vehicle. Background Art

[0002] In the field of new energy vehicles, electricity is the primary power source, and the efficiency and stability of its energy system are directly related to the vehicle's range and driving experience. Power conversion devices, such as DC-to-DC converters, are core components of power conversion. They convert electrical energy to a voltage level suitable for energy storage devices (such as batteries), improving energy utilization and ensuring efficient operation of the energy system.

[0003] Currently, to increase overall output power, multiple converters are often connected in parallel. While this can address power shortages, it often leads to stress concentration on the converter's switches. This creates significant stress on the switches during high-power output, increasing the risk of converter failure. Therefore, reducing the stress on the converter's switches is a pressing issue. Summary of the Invention

[0004] An embodiment of the present application provides a power conversion device that reduces the stress borne by the switching tube in the converter, so as to at least partially solve the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned object, according to a first aspect of the present application, there is provided a power conversion device, comprising a first connection portion, a plurality of converter groups, and a second connection portion;

[0006] Each of the second connecting portions is used to connect to at least one bus capacitor;

[0007] A plurality of converter groups are connected to the same first connection portion, and each converter group is correspondingly connected to one second connection portion;

[0008] The converter group includes a plurality of converter modules, each of which is connected to the first connection portion and the second connection portion corresponding to the converter group to which it belongs, so as to provide energy to the corresponding bus capacitor; wherein the bus capacitors are connected in series.

[0009] Optionally, the first connecting portion includes a first positive electrode connecting terminal connected to the positive electrode of the power supply and a first negative electrode connecting terminal connected to the negative electrode of the power supply.

[0010] Optionally, the second connection portion includes a second positive connection terminal connected to the first end of the corresponding bus capacitor and a second negative connection terminal connected to the second end of the corresponding bus capacitor.

[0011] Optionally, the converter module includes a drive circuit, a transformer and a rectifier circuit;

[0012] The transformer includes a primary side connected to the drive circuit and a secondary side connected to the rectifier circuit;

[0013] The driving circuit is connected to the first positive electrode connection terminal and the first negative electrode connection terminal respectively, and is used to operate according to the driving signal;

[0014] The rectifier circuit is connected to the second positive connection terminal and the second negative connection terminal, and is used to provide energy to the corresponding bus capacitor.

[0015] According to a second aspect of the present application, a power supply control method is provided, which is implemented based on the above-mentioned power conversion device, including:

[0016] generating current loop parameters and voltage loop parameters according to the output voltage of each converter group and the output current of each converter module, and determining a control mode of the converter module;

[0017] In response to the control mode being the voltage loop control mode, controlling the converter module to operate according to the voltage loop parameters;

[0018] In response to the control mode being the current loop control mode, the converter module is controlled to operate according to the current loop parameters.

[0019] Optionally, generating current loop parameters and voltage loop parameters according to the output voltage of each converter group and the output current of each converter module, and determining the control mode of the converter module includes:

[0020] generating voltage loop parameters according to the output voltage of the converter group;

[0021] generating current loop parameters according to the output current of the converter module;

[0022] If the voltage loop parameter is smaller than the current loop parameter, the control mode is determined to be the voltage loop control mode; if the current loop parameter is smaller than the voltage loop parameter, the control module is determined to be the current loop control mode.

[0023] Optionally, generating voltage loop parameters according to the output voltage of the converter group includes:

[0024] Based on the number of the converter groups, the preset target voltage is evenly divided to obtain a reference voltage for each of the converter groups;

[0025] Obtaining first voltage differences between the reference voltage and each of the output voltages;

[0026] Each of the first voltage differences is input into a corresponding proportional-integral controller, and the proportional-integral controller performs a proportional-integral operation on the first voltage difference to obtain the voltage loop parameter.

[0027] Optionally, generating a current loop parameter according to the output current of the converter module includes:

[0028] According to the number of the converter groups, the preset target current is evenly divided to obtain a reference current of each converter group;

[0029] superimposing the output currents of the converter modules in each converter group to obtain a current sum value of each converter group;

[0030] Obtaining first current differences between the reference current and each of the current sum values;

[0031] Each of the first current differences is input into a corresponding proportional-integral controller, and the proportional-integral controller performs a proportional-integral operation on the first current difference to obtain the current loop parameter.

[0032] Optionally, controlling the converter module to operate according to the voltage loop parameter includes:

[0033] Correcting the voltage loop parameters according to the output voltages of the converter groups to obtain corrected voltage parameters;

[0034] A control signal is generated according to the modified voltage parameter, and the operation of each converter module is controlled according to the control signal.

[0035] Optionally, the correcting the voltage loop parameters according to the output voltage of each converter group to obtain corrected voltage parameters includes:

[0036] Calculating a voltage deviation value between output voltages of each of the converter groups;

[0037] The voltage difference between the voltage loop parameter and the voltage deviation value is used as the correction voltage parameter.

[0038] Optionally, controlling the converter module to operate according to the current loop parameters includes:

[0039] Correcting the current loop parameters according to the output current of each converter module to obtain corrected current parameters;

[0040] A control signal is generated according to the corrected current parameter, and the operation of each converter module is controlled according to the control signal.

[0041] Optionally, the correcting the current loop parameters according to the output current of each converter module to obtain corrected current parameters includes:

[0042] Calculating a current deviation value between the converter modules in each converter group;

[0043] Accumulating the current deviation values to obtain a total current deviation value;

[0044] A current difference between the current loop parameter and the total current deviation value is used as the corrected current parameter.

[0045] Optionally, controlling the operation of each converter module according to the control signal includes:

[0046] generating a phase shift angle according to the number of the converter modules;

[0047] The control signal is sequentially phase-shifted according to the phase shift angle to obtain a plurality of drive signals; wherein the phase difference between any two adjacent drive signals is the phase shift angle;

[0048] The plurality of driving signals are respectively output to the converter modules to control the operation of the converter modules.

[0049] According to a third aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above method are implemented.

[0050] According to a fourth aspect of the present application, a controller is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0051] According to a fifth aspect of the present application, a vehicle is provided, comprising the above-mentioned power conversion device.

[0052] In summary, in the power conversion device of the embodiment of the present application, a first connection portion is connected to multiple converter groups, and each converter group corresponds to a second connection portion, and is respectively connected to a bus capacitor connected in series, so that the energy of each second connection portion is transmitted to the corresponding bus capacitor. At the same time, each converter module in the converter group is connected to the first connection portion and the second connection portion corresponding to the converter group to which it belongs, that is, all converter modules in the same converter group are connected in parallel. This allows the stress on the switching tube in the converter module during high power output to be reduced through multiple second connection portions while maintaining only one first connection portion.

[0053] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0055] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0056] Figure 1 is a block diagram of a power conversion device provided in an exemplary embodiment of the present disclosure;

[0057] Figure 2 is a circuit connection diagram of a power conversion device provided in an exemplary embodiment of the present disclosure;

[0058] Figure 3 is a circuit connection structure diagram of a converter module provided in an exemplary embodiment of the present disclosure;

[0059] Figure 4 is a flow chart of a power control method provided in an exemplary embodiment of the present disclosure;

[0060] Figure 5 is a flow chart of a method for determining a control mode provided in an exemplary embodiment of the present disclosure;

[0061] Figure 6 is a flow chart of a method for generating voltage loop parameters provided in an exemplary embodiment of the present disclosure;

[0062] Figure 7 is a flow chart of a method for generating current loop parameters provided in an exemplary embodiment of the present disclosure;

[0063] Figure 8 is a flow chart of a method for generating a driving signal provided in an exemplary embodiment of the present disclosure;

[0064] Figure 9 is a graph showing a trend of output current changes of a converter module in an exemplary embodiment of the present disclosure.

[0065] Explanation of the accompanying drawings: 1. First connecting part; 11. First positive connecting terminal; 12. First negative connecting terminal; 2. Converter group; 21. Converter module; 211. Drive circuit; 212. Rectifier circuit; 3. Second connecting part; 31. Second positive connecting terminal; 32. Second negative connecting terminal. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only 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 those skilled in the art without creative work are within the scope of protection of the present application.

[0067] According to the first aspect of this application, referring to Figures 1 to 4 The present disclosure provides a power conversion device, comprising a first connection portion 1, a plurality of converter groups 2, and a second connection portion 3. Each second connection portion 3 is used to connect to at least one bus capacitor. A plurality of converter groups 2 are connected to the same first connection portion 1, and each converter group 2 is connected to a corresponding second connection portion 3. The converter group 2 includes a plurality of converter modules 21, each converter module 21 being connected to the first connection portion 1 and the second connection portion 3 corresponding to the converter group 2 in which it is located to provide energy to the corresponding bus capacitor.

[0068] Among them, each bus capacitor is connected in series. Figure 2 , C represents a bus capacitor. The first connection portion 1 can be used for energy input to receive energy; the second connection portion 3 can be used for energy output to output energy to the corresponding bus capacitor.

[0069] In the above embodiment, multiple converter groups 2 are connected via a single first connection portion 1. Each converter group 2 corresponds to a corresponding second connection portion 3, which is connected to a corresponding bus capacitor in series. This allows energy from each second connection portion 3 to be transferred to the corresponding bus capacitor. Simultaneously, each converter module 21 in a converter group 2 is connected to the first connection portion 1 and the corresponding second connection portion 3 of its respective converter group 2. That is, all converter modules 21 in the same converter group 2 are connected in parallel. This allows multiple second connection portions 3 to reduce the stress on the switching transistors in the converter modules 21 during high-power output while maintaining a single first connection portion 1.

[0070] Reference Figure 2 In some embodiments, the first connection portion 1 includes a first positive connection terminal 11 connected to the positive electrode of the power supply and a first negative connection terminal 12 connected to the negative electrode of the power supply.

[0071] As an example, all first connection parts 1 connected to the positive pole of the power supply can be collectively referred to as the first positive pole connection terminal 11, and all first connection parts 1 connected to the negative pole of the power supply can be collectively referred to as the first negative pole connection terminal 12, that is, all converter groups 2 are connected to the same power supply.

[0072] Reference Figure 2In some embodiments, the second connection portion 3 includes a second positive connection terminal 31 connected to the first end of the corresponding bus capacitor and a second negative connection terminal 32 connected to the second end of the corresponding bus capacitor.

[0073] Reference Figure 2 In some embodiments, the converter module 21 includes a drive circuit 211, a transformer, and a rectifier circuit 212. The transformer includes a primary side connected to the drive circuit 211 and a secondary side connected to the rectifier circuit 212. The drive circuit 211 is connected to the first positive terminal 11 and the first negative terminal 12, respectively, and is configured to operate according to a drive signal; the rectifier circuit 212 is connected to the second positive terminal 31 and the second negative terminal 32, and is configured to provide energy to the corresponding bus capacitors.

[0074] Reference Figure 3 As an example, the drive circuit 211 can adopt a phase-shifted full-bridge circuit, and the rectifier circuit 212 can adopt a full-wave rectifier structure. The phase-shifted full-bridge circuit has a first bridge arm and a second bridge arm. The first bridge arm includes a first switch tube Q1 and a second switch tube Q2, and the second bridge arm includes a third switch tube Q3 and a fourth switch tube Q4. The first switch tube Q1, the second switch tube Q2, the third switch tube Q3, and the fourth switch tube Q4 constitute a phase-shifted full-bridge circuit. The switches on the same bridge arm, such as the first switch tube Q1 and the second switch tube Q2, are complementary and conductive. The switches on the second bridge arm have a phase angle difference with respect to the switches on the first bridge arm. The output voltage of the converter module 21 is controlled by adjusting the phase angle.

[0075] Reference Figure 4 According to the second aspect of the present application, a power control method is provided, which is implemented based on the above-mentioned power conversion device and includes steps S10 to S30, which are described in detail below.

[0076] Step S10 : generating current loop parameters and voltage loop parameters according to the output voltage of each converter group 2 and the output current of each converter module 21 , and determining the control mode of the converter module 21 .

[0077] Step S20 : In response to the control mode being the voltage loop control mode, the converter module 21 is controlled to operate according to the voltage loop parameters.

[0078] Step S30 : In response to the control mode being the current loop control mode, the converter module 21 is controlled to operate according to the current loop parameters.

[0079] In the above embodiment, current loop parameters and voltage loop parameters are first generated based on the output voltage of each converter group 2 and the output current of each converter module 21 to form a closed-loop control loop for the current and voltage loops, thereby determining the control mode of the converter module 21. Subsequently, if the control mode is determined to be the voltage loop control mode, the converter module 21 is regulated based on the voltage loop parameters; otherwise, the converter module 21 is regulated based on the current loop parameters. In this way, the current loop and the voltage loop compete to select the more appropriate control mode to control the converter module 21, thereby optimizing the performance of the converter module 21. Furthermore, by selecting only one of the current loop control mode and the voltage loop control mode at a time, the two control modes mutually inhibit each other, thereby avoiding abnormalities such as overvoltage or overcurrent in the converter module 21, thereby helping to reduce the stress on the switching transistors in the transformer module.

[0080] Reference Figure 5 In some embodiments, step S10 may include steps S101 to S103, which are described in detail below.

[0081] Step S101 : generating voltage loop parameters according to the output voltage of the converter group 2 .

[0082] Step S102 : generating current loop parameters according to the output current of the converter module 21 .

[0083] Step S103: If the voltage loop parameter is smaller than the current loop parameter, the control mode is determined to be the voltage loop control mode. If the current loop parameter is smaller than the voltage loop parameter, the control module is determined to be the current loop control mode.

[0084] In the above embodiment, selecting the smaller of the voltage and current loop parameters as the control mode minimizes the on-time of the switches in converter module 21 while meeting the set output power, thereby reducing conduction losses and minimizing the risk of overcurrent or overvoltage. Furthermore, the competition between the voltage and current loop parameters maintains a relatively balanced converter module 21, ensuring safe operation of the transformer module.

[0085] Reference Figure 6 In some embodiments, step S101 may include steps S1011 to S1013, which are described in detail below.

[0086] Step S1011 : Based on the number of converter groups 2 , the preset target voltage is evenly divided to obtain a reference voltage for each converter group 2 .

[0087] As an example, since the converter groups 2 are connected in parallel, the total output voltage is the sum of the output voltages of all converter groups 2. The preset target voltage is the set required voltage, and the reference voltage of each converter group 2 is the target value of each converter group 2.

[0088] Step S1012: obtaining first voltage differences between the reference voltage and each output voltage.

[0089] Step S1013: inputting each first voltage difference into a corresponding proportional-integral controller, and performing proportional-integral operation on the first voltage difference by the proportional-integral controller to obtain voltage loop parameters.

[0090] As an example, in voltage loop control mode, each reference voltage is used as the reference value for the corresponding converter group 2. The output voltage of converter group 2 is obtained and compared with the reference value. The voltage loop parameters are adjusted based on the first voltage difference of the error to ensure that each output voltage remains stable near the reference value, thus implementing voltage loop control mode. This ensures that the output voltage does not exceed the safe range, effectively avoiding overvoltage issues.

[0091] Reference Figure 7 In some embodiments, step S102 may include steps S1021 to S1024, which are described in detail below.

[0092] Step S1021 : Divide the preset target current equally according to the number of converter groups 2 to obtain a reference current for each converter group 2 .

[0093] Step S1022 : superimposing the output currents of the converter modules 21 in each converter group 2 to obtain a current sum value of each converter group 2 .

[0094] Step S1023: obtaining first current differences between the reference current and the sum of the currents.

[0095] Step S1024: inputting each first current difference into a corresponding proportional-integral controller, and performing proportional-integral operation on the first current difference by the proportional-integral controller to obtain current loop parameters.

[0096] As an example, in current loop control mode, each reference current is used as the reference value for the corresponding converter group 2. By obtaining the output current of converter group 2 and comparing it with the reference value, the voltage loop parameters are adjusted according to the first current difference of the error to ensure that each output current is stable near the reference value, thereby implementing current loop control mode. In this way, the current loop control mode can quickly respond and limit output current overshoot, preventing the occurrence of overcurrent.

[0097] In some embodiments, step S20 may include steps S201 and S202, which are described in detail below.

[0098] Step S201: Correcting voltage loop parameters according to the output voltages of each converter group 2 to obtain corrected voltage parameters.

[0099] Step S202 : generating a control signal according to the modified voltage parameter, and controlling each converter module 21 to operate according to the control signal.

[0100] As an example, step S201 may include steps S2011 to S2022, which are described in detail below.

[0101] Step S2011 : Calculate the voltage deviation between the output voltages of each converter group 2 .

[0102] As an example, if the number of converter groups 2 is even, the deviation can be calculated using two converter groups 2 as a unit, and all deviations can be added together to obtain the voltage deviation value. If the number of converters is odd, the voltage deviation value can be calculated by calculating the variance or other methods.

[0103] Step S2012: taking the voltage difference between the voltage loop parameter and the voltage deviation value as the correction voltage parameter.

[0104] In the above embodiment, the voltage deviation between the output voltages of each converter group 2 is first calculated to identify the unevenness of the output voltage distribution of each converter module 21. The voltage deviation is then used to adjust the voltage loop parameters to generate corrected voltage parameters. The corrected voltage parameters are then used to generate control signals for controlling the operation of each converter module 21. This adjusts for the unevenness in the output of each converter module 21, thereby achieving voltage balancing control of each converter module 21.

[0105] In some embodiments, step S30 may include steps S301 and S302, which are described in detail below.

[0106] Step S301: Correcting the current loop parameters according to the output current of each converter module 21 to obtain corrected current parameters;

[0107] Step S302 : generating a control signal according to the corrected current parameter, and controlling each converter module 21 to operate according to the control signal.

[0108] As an example, step S301 may include steps S3011 to S3013, which are described in detail below.

[0109] Step S3011: calculating the current deviation value between each converter module 21 in each converter group 2;

[0110] Step S3012: Accumulate the current deviation values to obtain a total current deviation value;

[0111] Step S3013: taking the current difference between the current loop parameter and the total current deviation value as the corrected current parameter.

[0112] In the above embodiment, the current deviation values between the individual converter modules 21 within each converter group 2 are first calculated to identify uneven output current distribution. Subsequently, the current deviation values are accumulated to obtain a total current deviation value that reflects the degree of current imbalance across the entire converter group 2. Finally, the difference between the current loop parameters and the total current deviation value is used to calculate a corrected current parameter. This corrected current parameter is then used to generate a drive signal for controlling the operation of each converter module 21, so that the current output of each converter module 21 approaches consistency, thereby achieving current balancing control.

[0113] Reference Figure 8 Step S202 or step 302 may include steps S401 to S403, which are described in detail below.

[0114] Step S401: generating a phase shift angle according to the number of converter modules 21;

[0115] Combine Figure 2 The phase shift angle can be expressed as Ts = 2π / N, where N represents the number of converter modules 21. For example, if the power supply varying device includes two converter groups 2, each of which includes two converter modules 21, and the number of converter modules 21 is four, then the phase shift angle is π / 2.

[0116] Step S402: sequentially phase-shifting the control signal according to the phase-shift angle to obtain a plurality of drive signals;

[0117] The phase difference between any two adjacent drive signals is a phase shift angle. For example, if there are four converter modules 21, the phases of the four converter modules 21 can be expressed as π / 2, π, 3π / 2, and 2π, respectively, so that the phase difference between any two adjacent drive signals is a phase shift angle of π / 2.

[0118] Step S403 : outputting a plurality of driving signals to each converter module 21 respectively to control the operation of each converter module 21 .

[0119] Combine Figure 9 , Figure 9The following example illustrates the output current variation trend of one converter module 21 when there are four converter modules 21. The total output current ripple of all converter modules 21 is the sum of the output current ripples of each converter module 21. The sum of the output current rising curves of individual converter modules 21 forms the total output current rising curve. Similarly, the total output current falling curve is also the sum of the output currents of individual converter modules 21. When the duty cycle is D, when the ripple turning point is on the bisector, that is, k = D × N, the current ripple is ideally zero. In actual operation, there will be certain deviations, but by staggering the phase angle of the drive signals for the switching transistors in each converter module 21, the total output current ripple can be greatly reduced, thereby further reducing the stress on the switching transistors in the converter module 21.

[0120] According to a third aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above method are implemented.

[0121] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0122] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0123] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1The function specified in one or more boxes.

[0124] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0125] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0126] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0127] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology for information storage. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media such as modulated communication signals and carrier waves.

[0128] According to a fourth aspect of the present application, a controller is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0129] According to a fifth aspect of the present application, a vehicle is provided, comprising the above-mentioned power conversion device.

[0130] The vehicle may be a fuel vehicle, a plug-in hybrid vehicle, a new energy vehicle, etc., and this disclosure does not make any specific limitations on this.

[0131] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0132] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0133] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0134] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A power conversion device, characterized in that: It includes a first connection part, a plurality of converter groups and a second connection part; Each of the second connecting portions is used to connect to at least one bus capacitor; A plurality of converter groups are connected to the same first connection portion, and each converter group is correspondingly connected to one second connection portion; The converter group includes a plurality of converter modules, each of which is connected to the first connection portion and the second connection portion corresponding to the converter group to which it belongs, so as to provide energy to the corresponding bus capacitor; wherein the bus capacitors are connected in series.

2. The power conversion device according to claim 1, wherein: The first connection portion includes a first positive connection end connected to the positive electrode of the power supply and a first negative connection end connected to the negative electrode of the power supply.

3. The power conversion device according to claim 2, characterized in that: The second connection portion includes a second positive connection terminal connected to the first end of the corresponding bus capacitor and a second negative connection terminal connected to the second end of the corresponding bus capacitor.

4. The power conversion device according to claim 3, characterized in that: The converter module includes a drive circuit, a transformer and a rectifier circuit; The transformer includes a primary side connected to the drive circuit and a secondary side connected to the rectifier circuit; The driving circuit is connected to the first positive electrode connection terminal and the first negative electrode connection terminal respectively, and is used to operate according to the driving signal; The rectifier circuit is connected to the second positive connection terminal and the second negative connection terminal, and is used to provide energy to the corresponding bus capacitor.

5. A power supply control method, implemented based on the power supply conversion device according to any one of claims 1 to 4, characterized in that: include: generating current loop parameters and voltage loop parameters according to the output voltage of each converter group and the output current of each converter module, and determining a control mode of the converter module; In response to the control mode being the voltage loop control mode, controlling the converter module to operate according to the voltage loop parameters; In response to the control mode being the current loop control mode, the converter module is controlled to operate according to the current loop parameters.

6. The power control method according to claim 5, wherein: Generating current loop parameters and voltage loop parameters according to the output voltage of each converter group and the output current of each converter module, and determining the control mode of the converter module, includes: generating voltage loop parameters according to the output voltage of the converter group; generating current loop parameters according to the output current of the converter module; If the voltage loop parameter is smaller than the current loop parameter, the control mode is determined to be the voltage loop control mode; if the current loop parameter is smaller than the voltage loop parameter, the control module is determined to be the current loop control mode.

7. The power control method according to claim 6, wherein: Generating voltage loop parameters according to the output voltage of the converter group includes: Based on the number of the converter groups, the preset target voltage is evenly divided to obtain a reference voltage for each of the converter groups; Obtaining first voltage differences between the reference voltage and each of the output voltages; Each of the first voltage differences is input into a corresponding proportional-integral controller, and the proportional-integral controller performs a proportional-integral operation on the first voltage difference to obtain the voltage loop parameter.

8. The power control method according to claim 6, wherein: Generating current loop parameters according to the output current of the converter module includes: According to the number of the converter groups, the preset target current is evenly divided to obtain a reference current of each converter group; superimposing the output currents of the converter modules in each converter group to obtain a current sum value of each converter group; Obtaining first current differences between the reference current and each of the current sum values; Each of the first current differences is input into a corresponding proportional-integral controller, and the proportional-integral controller performs a proportional-integral operation on the first current difference to obtain the current loop parameter.

9. The power control method according to claim 5, wherein: The step of controlling the converter module to operate according to the voltage loop parameters includes: Correcting the voltage loop parameters according to the output voltages of the converter groups to obtain corrected voltage parameters; A control signal is generated according to the modified voltage parameter, and the operation of each converter module is controlled according to the control signal.

10. The power control method according to claim 9, wherein: The step of correcting the voltage loop parameters according to the output voltage of each converter group to obtain corrected voltage parameters includes: Calculating a voltage deviation value between output voltages of each of the converter groups; The voltage difference between the voltage loop parameter and the voltage deviation value is used as the correction voltage parameter.

11. The power control method according to claim 5, wherein: The step of controlling the converter module to operate according to the current loop parameters includes: Correcting the current loop parameters according to the output current of each converter module to obtain corrected current parameters; A control signal is generated according to the corrected current parameter, and the operation of each converter module is controlled according to the control signal.

12. The power control method according to claim 11, wherein: The step of correcting the current loop parameters according to the output current of each converter module to obtain corrected current parameters includes: Calculating a current deviation value between the converter modules in each converter group; Accumulating the current deviation values to obtain a total current deviation value; A current difference between the current loop parameter and the total current deviation value is used as the corrected current parameter.

13. The power control method according to claim 9 or 11, characterized in that: The step of controlling the operation of each converter module according to the control signal includes: generating a phase shift angle according to the number of the converter modules; The control signal is sequentially phase-shifted according to the phase shift angle to obtain a plurality of drive signals; wherein the phase difference between any two adjacent drive signals is the phase shift angle; The plurality of driving signals are respectively output to the converter modules to control the operation of the converter modules.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 5 to 13 are implemented.

15. A controller having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 5 to 13 are implemented.

16. A vehicle, characterized in that: The invention comprises the power conversion device according to any one of claims 1 to 4.

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