Start-up control method of power converter, controller and charging pile

Abstract

The application provides a starting control method, a controller and a charging pile of a power converter. After the power converter changes the series-parallel connection relationship of the output ends of each voltage conversion module, the given rate of the electrical parameter in the PWM control loop corresponding to each voltage conversion module is set to a preset given rate greater than the normal given rate, so that each voltage conversion module starts, thereby accelerating the starting speed of the corresponding voltage conversion module, and the rapid gear shifting of the power conversion module is realized.

Description

Technical Field

[0001] This application relates to the field of power control technology, and in particular to a start-up control method for a power converter, a controller, and a charging pile. Background Technology

[0002] With the continuous development of technology, power supplies are being used more and more widely. Especially in the industrial sector, high-power power supply equipment is prevalent. Generally, high-power power supply equipment consists of multiple low-power power modules connected in parallel to output voltage that meets user needs. In charging station scenarios, to match the usage requirements of different vehicles, some existing charging stations change the series-parallel connection of power modules, allowing the power modules to operate at different voltage levels. When switching power modules from a series to a parallel connection, or vice versa, it is necessary to first ensure that the power modules are in a switched-off state. After completing the change in series-parallel connection, the power modules must be restarted to allow the power supply equipment to operate according to user needs. The process of completely shutting down and restarting the power modules to normal output takes a considerable amount of time, impacting the user experience. Summary of the Invention

[0003] This application provides a startup control method for a power converter, a controller, and a charging pile to solve the problem of long restart times for each power module in existing charging piles.

[0004] In a first aspect, this application provides a startup control method for a power converter. The power converter includes a power switch and at least two voltage conversion modules, each with its input terminal connected to an external power supply. The power switch is used to change the series-parallel connection relationship of the output terminals of each voltage conversion module according to different switching commands, so that the power converter operates at different voltage levels. This method, applied after changing the series-parallel connection relationship of the output terminals of each voltage conversion module, includes: The setpoint rate of the electrical parameters in the PWM control loop corresponding to each voltage conversion module is increased from the normal setpoint rate to the preset setpoint rate, so that each voltage conversion module can start. The preset setpoint rate is greater than the normal setpoint rate.

[0005] In one possible implementation, the electrical parameters include at least one of the following: PI parameters, given voltage, given current, input limiting, and output limiting.

[0006] In one possible implementation, after the power converter operates at the voltage level corresponding to the switching command, the method further includes: The setpoint rate of the electrical parameters in the PWM control loop corresponding to each voltage conversion module is restored from the preset setpoint rate to the normal setpoint rate.

[0007] In one possible implementation, the power converter further includes at least one PFC module, each PFC module being connected to at least two voltage conversion modules. The PFC module is connected between its corresponding voltage conversion module and the power supply. Maintaining each PFC module in an operational state and changing the series-parallel connection relationship at the output terminals of each voltage conversion module includes: Upon receiving a switching command, all voltage conversion modules that are in operation will be switched to the off state, and all power switches that are currently in the closed state will be switched to the open state, so that each PFC module continues to be in operation. The corresponding power switch is closed according to the switching command, so that the power converter operates at the voltage level corresponding to the switching command.

[0008] In one possible implementation, all power switches currently in the closed state are switched to the open state, including: Monitor the output voltage of the power converter; When the output voltage meets the switching conditions, all power switches that are currently closed will be switched to open.

[0009] In one possible implementation, the switching condition includes: the time when the output voltage first falls below a preset voltage threshold is less than a preset time.

[0010] Secondly, this application provides a start-up control device for a power converter. The power converter includes a power switch and at least two voltage conversion modules, the input terminals of each voltage conversion module being connected to an external power supply. The power switch is used to change the series-parallel connection relationship of the output terminals of each voltage conversion module according to different switching commands, so that the power converter operates at different voltage levels. The start-up control device includes: The speed-up unit is used to increase the setpoint rate of the electrical parameters in the PWM control loop corresponding to each voltage conversion module from the normal setpoint rate to the preset setpoint rate after changing the series-parallel connection relationship at the output terminals of each voltage conversion module, so as to start each voltage conversion module. The preset setpoint rate is greater than the normal setpoint rate.

[0011] Thirdly, this application provides a controller, including a memory and a processor, wherein the memory stores a computer program that can run on the processor, and the processor executes the computer program to implement the steps of switching control methods as described in the first aspect or any possible implementation of the first aspect.

[0012] Fourthly, this application provides a charging pile, including the controller and power converter as described in the third aspect above. The power converter includes a power switch and at least two voltage conversion modules. The input terminals of each voltage conversion module are connected to an external power supply. The power switch is used to change the series-parallel connection relationship of the output terminals of each voltage conversion module according to different switching commands, so that the power converter operates at different voltage levels.

[0013] Fifthly, this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the switching control method as described in the first aspect or any possible implementation of the first aspect.

[0014] This application provides a power converter startup control method, controller, and charging pile. After the power converter changes the series-parallel connection relationship of the output terminals of each voltage conversion module, the given rate of the electrical parameters in the PWM control loop corresponding to each voltage conversion module is set to a preset given rate greater than the normal given rate, so as to start each voltage conversion module, thereby speeding up the startup speed of the corresponding voltage conversion module and realizing the rapid switching of the power conversion module. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a power converter provided in an embodiment of this application; Figure 2 This is a schematic diagram of another power converter provided in an embodiment of this application; Figure 3 This is a circuit diagram of a power converter provided in an embodiment of this application; Figure 4 This is a flowchart illustrating the implementation of the switching control method provided in the embodiments of this application; Figure 5 This is a schematic diagram of a PWM control loop provided in an embodiment of this application; Figure 6 This is provided by the embodiments of this application. Figure 3 The schematic diagram of the PWM control loop structure of the circuit shown; Figure 7 This is a schematic diagram comparing the output speed of the PWM control loop provided in the embodiments of this application; Figure 8This is a schematic diagram of another power converter provided in the embodiments of this application; Figure 9 This is an example flowchart of a switching control method provided in an embodiment of this application; Figure 10 This is a schematic diagram of the switching control device provided in the embodiments of this application; Figure 11 This is a schematic diagram of the controller provided in an embodiment of this application. Detailed Implementation

[0017] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, circuits, and methods are omitted so as not to obscure the description of this application with unnecessary detail.

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following description will be provided in conjunction with the accompanying drawings and specific embodiments.

[0019] The switching control method provided in this application is mainly applied to a power converter, which may include a power switch and at least two voltage conversion modules, the input terminals of each voltage conversion module being connected to an external power supply. The power switch is used to change the series-parallel connection relationship of the output terminals of each voltage conversion module according to different switching commands, so that the power converter operates at different voltage levels.

[0020] Optionally, the voltage conversion module can be any one of AC / DC conversion module, AC / AC conversion module, DC / AC conversion module, and DC / DC conversion module. The voltage conversion module in this application includes a converter circuit composed of multiple switching transistors, and the output of each voltage conversion module can be controlled by adjusting the PWM.

[0021] The output terminal of the power converter can be used to connect to a load. The output terminal may include a first output terminal and a second output terminal. The output terminals of each voltage conversion module are connected through power switches. By adjusting the switching state of each power switch, the series and parallel connection relationship of each voltage conversion module can be changed to adjust the output voltage range of the power converter.

[0022] Optionally, when the power switch is in the first operating state, the voltage conversion modules in the power converter are connected in series, and the power conversion modules can output operating voltages within a first range.

[0023] When the power switch is in the second operating state, the voltage conversion modules in the power converter are connected in parallel, and the power conversion modules can output the operating voltage in the second range.

[0024] When the power switch is in the third operating state, the first number of voltage conversion modules in the power converter are connected in series, the remaining voltage conversion modules are in a dormant state, and the power conversion modules can output the operating voltage in the third range.

[0025] When the power switch is in the fourth operating state, the second number of voltage conversion modules in the power converter are connected in parallel, and the remaining voltage conversion modules are in a dormant state. The power conversion modules can output the operating voltage in the fourth range.

[0026] The first range should not be less than the second range, and the third range should not be greater than the first range. For example, the first range could be 500V-1000V, the second range could be 300V-500V, and the third range could be 400V-800V. Specific adjustments can be made based on actual circumstances.

[0027] For example, Figure 1 This is a schematic diagram of the structure of a power converter provided in an embodiment of this application, as shown below. Figure 1 As shown, the power converter may include two voltage conversion modules and three power switches. The input terminals of the two voltage conversion modules are connected to an external power supply, and the output terminals of the two voltage conversion modules are connected through the three power switches.

[0028] Specifically, when K1 is closed and both K2 and K3 are open, the two voltage conversion modules are connected in series to output the first voltage level. When K1 is open and both K2 and K3 are closed, the two voltage conversion modules are connected in parallel to output the second voltage level.

[0029] In other words, upon receiving a switching command for the first output voltage level, K1 can be closed, and both K2 and K3 can be opened. Upon receiving a switching command for the second output voltage level, K1 can be opened, and both K2 and K3 can be closed. The specific settings can be configured according to the actual situation.

[0030] For example, Figure 2 This is a schematic diagram of another power converter provided in an embodiment of this application, as shown below. Figure 2 As shown, the power converter may include four voltage conversion modules and three power switches. The input terminals of the four voltage conversion modules are all connected to an external battery, and the output terminals of the four voltage conversion modules are connected through the three power switches.

[0031] Specifically, when K5 is closed and K4 and K6 are both open, the four voltage conversion modules are connected in series to output the third voltage level. When K1 is open and K2 and K3 are both closed, the two voltage conversion modules are connected in parallel to output the fourth voltage level.

[0032] In other words, upon receiving a switching command for the third output voltage level, K5 can be closed, and both K4 and K6 can be opened. Upon receiving a switching command for the fourth output voltage level, K5 can be opened, and both K4 and K6 can be closed. The specific settings can be configured according to the actual situation.

[0033] For example, Figure 3 This is a circuit diagram of a power converter provided in an embodiment of this application, such as... Figure 3 As shown, the power converter may include four DC / DC conversion modules, and the output terminals of these four DC / DC conversion modules can be connected via three relays (H_Relay, L_Relay_1, L_Relay_2). The power converter may include a high-voltage mode and a low-voltage mode.

[0034] When H_Relay is engaged and L_Relay_1 and L_Relay_2 are both disengaged, the outputs of the four DC / DC converter modules are connected in series, and the power converter can operate in high-voltage mode. When H_Relay is disengaged and L_Relay_1 and L_Relay_2 are both engaged, the outputs of the four DC / DC converter modules are connected in parallel, and the power converter can operate in low-voltage mode.

[0035] Figure 1 , Figure 2 , Figure 3 The diagram shows some structural schematics of power converters according to embodiments of this application. Other power converter structures, including multiple voltage conversion modules and power switches, are similar to those described above, and will not be repeated here.

[0036] See Figure 4 The diagram illustrates the implementation flowchart of the switching control method provided in this application embodiment. Figure 4 As shown, a switching control method can be applied to a power converter including the above, and the method may include S101 to S102.

[0037] S101, upon receiving a switching command, switches all voltage conversion modules in the working state to the off state and switches all power switches currently in the closed state to the open state.

[0038] The switching command is used to indicate the required voltage level of the power converter. When a switching command is received, it indicates that the power converter needs to switch levels. It will first switch the voltage conversion modules that are in operation to the off state, so that each voltage conversion module in operation stops outputting.

[0039] After controlling each voltage conversion module to switch to the off state, control all power switches that are currently in the closed state to switch to the open state.

[0040] Optionally, the switching command can be issued externally. For example, the power converter in this application can be a charging pile for electric vehicles. When the vehicle is charging, the switching command can be issued by the charging gun recognizing the vehicle's charging voltage, or it can be issued directly by the charging vehicle. The charging pile will then act accordingly based on the switching command.

[0041] Optionally, the power switch can be a switching device such as a MOSFET or a relay.

[0042] For example, such as Figure 1 As shown, the power converter can include a high-voltage range and a low-voltage range. The high-voltage range is the output voltage range of the power converter when K1 is closed and both K2 and K3 are open, that is, two voltage conversion modules are connected in series. The low-voltage range is the output voltage range of the power converter when K1 is open and both K2 and K3 are closed, that is, two voltage conversion modules are connected in parallel.

[0043] The power converter is currently in the high-voltage position. When it receives a switching command to switch from the high-voltage position to the low-voltage position, it shuts down the two voltage conversion modules and stops outputting. Then, it switches K1 from closed to open.

[0044] Alternatively, if the current power converter is in the low-voltage position, when it receives a switching command to switch from the low-voltage position to the high-voltage position, it will shut down the two voltage conversion modules and stop the output, and then switch K2 and K3 from closed to open.

[0045] In the embodiments of this application, the voltage conversion module can be turned off first, and then the power switch can be disconnected. Alternatively, the power switch can be disconnected first, and then the voltage conversion module can be turned off. Or both can be operated simultaneously, depending on the actual situation.

[0046] S102, close the corresponding power switch according to the switching command, so that the power converter operates at the voltage level corresponding to the switching command.

[0047] The switching command includes information about the power switches that need to be closed. After all power switches are opened, the power switch for the corresponding voltage level can be closed to make the power converter operate at the voltage level corresponding to the switching command. The power converter can include at least two voltage levels, each voltage level corresponding to a switching command, and each switching command includes information about the power switches that need to be closed for that voltage level.

[0048] For example, such as Figure 1 As shown, the power converter can include a high-voltage range and a low-voltage range. The high-voltage switching command includes information about the power switch that needs to be closed for the high-voltage range, i.e., closing K1. The low-voltage switching command includes information about the power switches that need to be closed for the low-voltage range, i.e., closing K2 and K3.

[0049] The power converter is currently in the low-voltage position. Upon receiving a high-voltage switching command, it shuts down both voltage conversion modules and disconnects K2 and K3. Then, it closes K1 to switch the power converter to the high-voltage position.

[0050] The power converter is currently in the high-voltage position. Upon receiving a low-voltage switching command, it shuts down both voltage conversion modules and disconnects K1. Subsequently, it closes K2 and K3 to switch the power converter to the low-voltage position.

[0051] This embodiment of the application controls the shutdown of each operating voltage conversion module in the power converter and disconnects all power switches upon receiving a switching command. Then, according to the switching command, it closes the corresponding power switch to complete the voltage level switching of the power converter. This expands the output voltage range of the power converter and can adapt to more user needs.

[0052] In some embodiments of this application, after closing the corresponding power switch according to the switching instruction, the method may further include: The setpoint rate of the electrical parameters in the PWM control loop corresponding to each voltage conversion module is increased from the normal setpoint rate to the preset setpoint rate, so that each voltage conversion module can start. The preset setpoint rate is greater than the normal setpoint rate.

[0053] Each voltage conversion module corresponds to a PWM control loop. The PWM control loop can control the state of each switching transistor in the corresponding voltage conversion module, thereby controlling the start or stop of the voltage conversion module.

[0054] Optionally, the electrical parameters may include at least one of the following: given voltage, given current, input limiting, output limiting, and PI parameters. PI parameters may include KP parameters and KI parameters.

[0055] Increasing the setpoint rate of the electrical parameters in the PWM control loop can start the voltage conversion module faster. The normal setpoint rate is the setpoint rate when the voltage conversion module is working normally, and the preset setpoint rate is generally greater than the normal setpoint rate. For example, the preset setpoint rate is 4 times the normal setpoint rate.

[0056] For example, Figure 5 This is a schematic diagram of a PWM control loop provided in an embodiment of this application.

[0057] like Figure 5 As shown, this PWM control loop generates PWM waves based on corresponding current, voltage, and PI parameters, thereby controlling the state of each switch in the voltage conversion module and enabling the normal operation of the voltage conversion module. By accelerating the input rates of the given current Io_ref, given voltage Uo_ref, and PI parameters, the startup speed of the voltage conversion module can be increased.

[0058] For example, Figure 6 This is provided by the embodiments of this application. Figure 3 The diagram shows the PWM control loop structure of the circuit shown.

[0059] like Figure 3 and Figure 6 As shown, this PWM control loop can also generate PWM waves based on the corresponding current parameters, voltage parameters, and PI parameters, and control the corresponding switching transistors Q1-Q8 to ensure the normal operation of each voltage conversion module.

[0060] By accelerating the rate at which the relevant power supply parameters are given, the speed at which PWM waves Q1-Q4 and Q5-Q8 are generated can be increased, thereby accelerating the start-up speed of the corresponding voltage conversion module and enabling rapid switching of the power conversion module.

[0061] Figure 7 This is a schematic diagram comparing the output speed of the PWM control loop provided in an embodiment of this application. For example... Figure 7 As shown, to achieve a frequency of 220kHz, increasing the electrical parameter setpoint only requires about 100ms, while the conventional method requires about 500ms. To achieve the same output frequency, the time required to increase the electrical parameter setpoint is significantly less than the time required without increasing it.

[0062] This application embodiment enables the corresponding voltage conversion module to start up quickly by accelerating the rate at which electrical parameters are given in the PWM control loop, thereby reducing the overall switching time.

[0063] In some embodiments of this application, the power converter further includes at least one PFC module. Each PFC module can be connected to at least two voltage conversion modules. The output of the PFC module includes a positive bus and a negative bus, and each bus can be connected to at least one voltage conversion module. Each PFC module is connected between its corresponding voltage conversion module and a power source, which can be the power grid. The PFC module can rectify the AC power from the power grid into DC power and output it to the corresponding voltage conversion module. The voltage conversion module can be a DC / DC converter.

[0064] Switching control methods may also include: Upon receiving a switching instruction, keep all PFC modules in an active state.

[0065] For example, Figure 8 This is a schematic diagram of another power converter provided in an embodiment of this application. For example... Figure 8 As shown, the power converter may include one PFC module and four DC / DC converter modules. Two DC / DC converter modules are connected to the positive output bus of the PFC module, and the other two are connected to the negative output bus of the PFC module. The PFC module is connected between its four corresponding DC / DC converter modules and the power grid. Throughout the switching process, the PFC module remains operational without needing to be restarted, thus reducing switching time.

[0066] This embodiment of the application disables the corresponding voltage conversion module when the switching command is manually entered, while keeping each PFC module in an operational state. Compared to disabling the PFC module when the voltage conversion module is disabled and then restarting the PFC module, the overall switching time can be shortened and the switching efficiency improved.

[0067] In some embodiments of this application, after the power converter operates at the voltage level corresponding to the switching command, the method may further include: The setpoint rate of the electrical parameters in the PWM control loop corresponding to each voltage conversion module is restored from the preset setpoint rate to the normal setpoint rate.

[0068] After the power converter switches gears, the setpoints of the electrical parameters in each PWM control loop can be restored to their normal setpoints to reduce the setpoint frequency of each device and extend the device's lifespan.

[0069] In some embodiments of this application, the phrase "switching all power switches currently in the closed state to the open state" in S101 above may include: Monitor the output voltage of the power converter.

[0070] When the output voltage meets the switching conditions, all power switches that are currently closed will be switched to open.

[0071] After switching all voltage conversion modules that are in operation to the off state, the output voltage of the power converter will not suddenly become zero, but will gradually decrease because each voltage conversion module has a capacitor at its output terminal and the power converter output terminal is generally equipped with a bleed resistor.

[0072] Upon receiving a switching command, the output voltage of the power converter can be monitored in real time. When the output voltage meets the switching conditions, the power switch that is in the closed state is switched to the open state. This reduces the stress on the disconnecting switch, avoids output failure, and reduces the probability of safety accidents.

[0073] Switching conditions can include any of the following: (1) The output voltage of the power converter is less than the preset voltage threshold. The preset voltage threshold can be set according to the actual situation, for example, it can be 60V.

[0074] (2) The time when the output voltage of the power converter is first lower than the preset voltage threshold is less than the preset time. The preset time can be set according to the actual situation.

[0075] If the time it takes for the output voltage of the power converter to first fall below the preset voltage threshold is not less than a preset time, then the output bleeder resistor of the power converter may be faulty. Judging by the time can also monitor whether the power converter has failed to a certain extent.

[0076] For example, Figure 9 This is an example flowchart of a switching control method provided in an embodiment of this application, such as... Figure 9 As shown, the file-switching process may include: Determine if a switching command has been received; if not, control the DC / DC module to operate at the normal given rate.

[0077] Upon receiving a switching command, the DC / DC module in operation is shut down, and the power switch in the closed state is disconnected. At the same time, the setpoint rate of the electrical parameters in the PWM control loop of the DC / DC module is increased to speed up the startup of the DC / DC module.

[0078] After the shift is completed, the setpoint is restored to the normal setpoint to enable the power converter to work properly.

[0079] This application embodiment monitors the output voltage of the power converter and disconnects the corresponding power switch when the output voltage meets the switching conditions. This reduces the switching stress on the power switch and extends its service life. By changing the setpoint rate of the electrical parameters in the PWM control loop, the startup time of each voltage conversion module is accelerated. At the same time, by not turning off the PFC, the time of the entire switching process is further reduced, thus reducing the user's waiting time and improving the user experience.

[0080] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0081] The following are device embodiments of this application. For details not described in detail, please refer to the corresponding method embodiments described above.

[0082] Figure 10 A schematic diagram of the switching control device provided in an embodiment of this application is shown. For ease of explanation, only the parts related to the embodiment of this application are shown, and are described in detail below: like Figure 10 As shown, the switching control device 20 is applied to the power converter. The device includes a power switch and at least two voltage conversion modules. The input terminals of each voltage conversion module are connected to an external power supply. The power switch is used to change the series-parallel connection relationship of the output terminals of each voltage conversion module according to different switching commands, so that the power converter can operate at different voltage levels. The switching control device 20 may include: The first control unit 201 is used to switch all voltage conversion modules in the working state to the off state and switch all power switches currently in the closed state to the open state when a switching command is received; The second control unit 202 is used to close the corresponding power switch according to the switching command, so that the power converter operates at the voltage level corresponding to the switching command.

[0083] In some embodiments of this application, the device 20 may further include: The speed-up unit is used to increase the setpoint rate of the electrical parameters in the PWM control loop corresponding to each voltage conversion module from the normal setpoint rate to the preset setpoint rate after closing the corresponding power switch according to the switching command, so as to start each voltage conversion module. The preset setpoint rate is greater than the normal setpoint rate.

[0084] In some embodiments of this application, the device 20 may further include: The deceleration unit is used to restore the setpoint rate of the electrical parameters in the PWM control loop corresponding to each voltage conversion module from the preset setpoint rate to the normal setpoint rate after the power converter is operating at the voltage level corresponding to the switching command.

[0085] In some embodiments of this application, the electrical parameters include at least one of PI parameters, given voltage, given current, input limiting, and output limiting.

[0086] In some embodiments of this application, the first control unit 201 may include: The monitoring subunit is used to monitor the output voltage of the power converter. The control subunit is used to switch all power switches that are currently closed to open when the output voltage meets the switching conditions.

[0087] In some embodiments of this application, the switching condition includes: the output voltage is less than a preset voltage threshold.

[0088] Figure 11 This is a schematic diagram of the controller provided in an embodiment of this application. Figure 11 As shown, the controller 30 in this embodiment includes a processor 300 and a memory 301. The memory 301 stores a computer program 302 that can run on the processor 300. When the processor 300 executes the computer program 302, it implements the steps in the various switching control method embodiments described above, for example... Figure 4 S101 to S102 are shown. Alternatively, when the processor 300 executes the computer program 302, it implements the functions of each module / unit in the above-described device embodiments, for example... Figure 10 The functions of modules 201 to 202 are shown.

[0089] For example, computer program 302 can be divided into one or more modules / units, one or more of which are stored in memory 301 and executed by processor 300 to complete this application. One or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of computer program 302 in controller 30. For example, computer program 302 can be divided into... Figure 10 Modules 201 to 202 are shown.

[0090] Controller 30 may be a power controller, power manager, etc. Controller 30 may include, but is not limited to, processor 300 and memory 301. Those skilled in the art will understand that... Figure 11This is merely an example of controller 30 and does not constitute a limitation on controller 30. It may include more or fewer components than shown, or combine certain components, or different components. For example, the controller may also include input / output devices, network access devices, buses, etc.

[0091] The processor 300 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0092] The memory 301 can be an internal storage unit of the controller 30, such as a hard disk or RAM of the controller 30. The memory 301 can also be an external storage device of the controller 30, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the controller 30. Furthermore, the memory 301 can include both internal and external storage units of the controller 30. The memory 301 is used to store computer programs and other programs and data required by the controller. The memory 301 can also be used to temporarily store data that has been output or will be output.

[0093] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0094] This application also provides a power supply device, including the controller 30 described above.

[0095] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0096] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0097] In the embodiments provided in this application, it should be understood that the disclosed devices / controllers and methods can be implemented in other ways. For example, the device / controller embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0098] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0099] If an integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various switching control method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0100] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A startup control method for a power converter, characterized in that, The power converter includes a power switch and at least two voltage conversion modules, each with its input terminal connected to an external power supply. The power switch is used to change the series-parallel connection of the output terminals of each voltage conversion module according to different switching commands, so that the power converter operates at different voltage levels. The method, after changing the series-parallel connection of the output terminals of each voltage conversion module, includes: The setpoint rate of the electrical parameters in the PWM control loop corresponding to each voltage conversion module is increased from the normal setpoint rate to a preset setpoint rate to enable each voltage conversion module to start. The preset setpoint rate is greater than the normal setpoint rate.

2. The start-up control method according to claim 1, characterized in that, The electrical parameters include at least one of the following: PI parameters, given voltage, given current, input limiting, and output limiting.

3. The start-up control method according to claim 1, characterized in that, After the power converter operates at the voltage level corresponding to the switching command, the method further includes: The setpoint rate of the electrical parameters in the PWM control loop corresponding to each voltage conversion module is restored from the preset setpoint rate to the normal setpoint rate.

4. The start-up control method according to any one of claims 1-3, characterized in that, The power converter further includes at least one PFC module, each PFC module being connected to at least two voltage conversion modules. The PFC module is connected between its corresponding voltage conversion module and the power supply. Maintaining each PFC module in operation and changing the series-parallel connection relationship at the output terminals of each voltage conversion module includes: Upon receiving a switching command, all voltage conversion modules that are in operation will be switched to the off state, and all power switches that are currently in the closed state will be switched to the open state, so that each PFC module continues to be in operation. The power switch is closed according to the switching command, so that the power converter operates at the voltage level corresponding to the switching command.

5. The start-up control method according to claim 4, characterized in that, Switching all power switches currently in the closed state to the open state includes: Monitor the output voltage of the power converter; When the output voltage meets the switching conditions, all power switches that are currently in the closed state are switched to the open state.

6. The switching control method according to claim 5, characterized in that, The switching conditions include: the time when the output voltage first falls below a preset voltage threshold is less than a preset time.

7. A start-up control device for a power converter, characterized in that, The power converter includes a power switch and at least two voltage conversion modules, the input terminals of each voltage conversion module being connected to an external power supply; wherein, the power switch is used to change the series-parallel connection relationship of the output terminals of each voltage conversion module according to different switching commands, so that the power converter operates at different voltage levels; the start-up control device includes: The speed-up unit is used to increase the setpoint rate of the electrical parameters in the PWM control loop corresponding to each voltage conversion module from the normal setpoint rate to the preset setpoint rate after changing the series-parallel connection relationship at the output terminals of each voltage conversion module, so as to start each voltage conversion module. The preset setpoint rate is greater than the normal setpoint rate.

8. A controller comprising a memory and a processor, the memory storing a computer program executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the startup control method as described in any one of claims 1 to 6 above.

9. A charging pile, characterized in that, The device includes the controller and power converter as described in claim 8, wherein the power converter includes a power switch and at least two voltage conversion modules, and the input terminals of each voltage conversion module are connected to an external power supply; wherein the power switch is used to change the series-parallel connection relationship of the output terminals of each voltage conversion module according to different switching commands, so that the power converter operates at different voltage levels.

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