Communication network structure, control method, controller and charging system

Abstract

The invention discloses a communication network structure, a control method, a controller and a charging system, and the communication network structure comprises a plurality of power module groups, each power module group comprises a main power module and a plurality of sub power modules; and the hierarchical communication network comprises an inter-group communication network and a plurality of intra-group communication networks, the inter-group communication network is used for communication of the main power modules among the plurality of power module groups, and the intra-group communication networks are used for communication of the main power modules in the power module groups and the sub power modules. The technical problems that in the prior art, due to the fact that the CAN bus load rate of a centralized CAN network in a large-scale distributed power module system is too high, periodic communication of the power module is interrupted, and output current is unstable and jumps are solved. Through a layered CAN communication network structure, the technical effects of reducing the CAN bus load rate, ensuring continuous and stable communication of the module and outputting current are achieved.

Description

Technical Field

[0001] The present application relates to the field of power module communication, and in particular to a communication network structure, a control method, a controller and a charging system. Background Art

[0002] With the development of high-power power equipment, multiple power modules need to be used in parallel to meet high power requirements. In the prior art, a centralized CAN network structure is usually used to achieve communication between power modules. However, when the number of power modules is large, the CAN bus load rate is too high, resulting in periodic communication interruptions in some power modules, causing significant fluctuations in the overall output current, and may also cause safety hazards, affecting the stability, reliability and safety of the charging system. Especially in high-power, fast-charging scenarios, excessive CAN bus load rates can cause the coordinated control between power modules to fail, resulting in local overload or uneven charging of the charging equipment, which in turn leads to safety accidents such as overheating of the charging equipment, battery damage, and even fire.

[0003] Therefore, how to reduce the CAN bus load rate in a large-scale distributed power module system, ensure the stability of power module communication and output current, and improve the safety and reliability of the charging process is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The main purpose of this application is to provide a communication network structure, a control method, a controller and a charging system, aiming to solve the technical problem in the prior art that the CAN bus load rate of the centralized CAN network in a large-scale distributed power module system is too high, resulting in periodic communication interruption of the power module and unstable output current fluctuations.

[0005] To achieve the above-mentioned purpose, the present application provides a communication network structure, including: multiple power module groups, each power module group includes a main power module and multiple sub-power modules; a hierarchical communication network, including an inter-group communication network and multiple intra-group communication networks, wherein the inter-group communication network is used for the main power module communication between the multiple power module groups, and the intra-group communication network is used for the main power module and each sub-power module in the power module group.

[0006] Optionally, the main power module includes a first CAN channel and a second CAN channel; the inter-group communication network includes a first CAN bus, and the intra-group communication network includes a second CAN bus; the first CAN channel of each of the main power modules is respectively connected to the first CAN bus, and the first CAN bus is used to transmit communication signals between the main power modules; the second CAN channel of the main power module is connected to each of the corresponding sub-power modules through the second CAN bus, and the second CAN bus is used to transmit communication signals between the sub-power module and the corresponding main power module.

[0007] Optionally, the first CAN bus and the second CAN bus both include a CAN_H signal line and a CAN_L signal line; the CAN_H signal line and the CAN_L signal line of the first CAN bus are connected via a terminal resistor on the input side and the output side respectively; the CAN_H signal line and the CAN_L signal line of the second CAN bus are connected via a terminal resistor on the input side and the output side respectively.

[0008] In addition, to achieve the above-mentioned purpose, the present application also provides a power module control method, which performs power scheduling based on the communication network, and the method is executed by a power controller, and the method includes: receiving a power demand signal, and obtaining a power demand parameter based on the power demand signal; calculating the required main power module call number and sub-power module call number based on the multiple power module groups and the power demand parameters; through the hierarchical communication network, selecting the corresponding main power module and sub-power module for power output based on the main power module call number and the sub-power module call number.

[0009] Optionally, the required number of main power module calls and the number of sub-power module calls are calculated according to the multiple power module groups and the power demand parameters, including: obtaining the maximum output current of each main power module and each sub-power module and the total number of main power modules, the total number of sub-power modules, the distributed maximum total current and the distributed total power of the communication network; based on the power demand parameters, obtaining the required power and the required current; when the distributed total power is less than or equal to the required power, the number of main power module calls is the total number of main power modules, and the number of sub-power module calls is the total number of sub-power modules; when the distributed total power is greater than the required power, the number of main power module calls and the number of sub-power module calls are determined according to the maximum output current of each main power module, the maximum output current of each sub-power module, the total number of main power modules, the total number of sub-power modules, the distributed maximum total current and the required current.

[0010] Optionally, the maximum output current of the main power module and the maximum output current of the sub-power modules are the same; determining the main power module call quantity and the sub-power module call quantity based on the maximum output current of each main power module, the maximum output current of each sub-power module, the total number of main power modules, the total number of sub-power modules, the distributed maximum total current and the demand current includes: determining the total number of power modules based on the total number of main power modules and the total number of sub-power modules; obtaining preset call constraints; determining the main power module call quantity based on the call constraints, the demand current, the distributed maximum total current and the total number of power modules; determining the sub-power module call quantity based on the call constraints, the demand current, the maximum output current of each power module, the total number of power modules and the main power module call quantity.

[0011] Optionally, the call constraint conditions include: the number of main power modules called is less than or equal to the total number of main power modules, the number of sub-power modules called is less than or equal to the total number of sub-power modules, and the demand current is less than or equal to the corresponding specified maximum current.

[0012] In addition, the present application also provides a power controller, which is used to: receive a power demand signal and obtain power demand parameters based on the power demand signal; calculate the required main power module call quantity and sub-power module call quantity based on the multiple power module groups and the power demand parameters; and through the hierarchical communication network, select the corresponding main power module and sub-power module for power output based on the main power module call quantity and the sub-power module call quantity.

[0013] Optionally, the power controller is also used to: obtain the maximum output current of each main power module and each sub-power module and the total number of main power modules, the total number of sub-power modules, the distributed maximum total current and the distributed total power of the communication network; obtain the required power and the required current based on the power demand parameters; when the distributed total power is less than or equal to the required power, the number of main power modules called is the total number of main power modules, and the number of sub-power modules called is the total number of sub-power modules; when the distributed total power is greater than the required power, the number of main power modules called and the number of sub-power modules called are determined according to the maximum output current of each main power module, the maximum output current of each sub-power module, the total number of main power modules, the total number of sub-power modules, the distributed maximum total current and the required current.

[0014] In addition, the present application also provides a charging system, including: the communication network structure and a power controller; wherein the power controller is used to obtain a power demand signal of a charging device, and output power using the communication network structure based on the power demand signal.

[0015] The beneficial effects that this application can achieve are as follows:

[0016] The communication network of the present application groups the power modules and adopts a hierarchical communication network structure, so that the inter-group communication network only transmits the communication signals between the main power modules, and the intra-group communication network only transmits the communication signals between the main power modules and the sub-power modules in the group. This hierarchical structure effectively reduces the number of nodes connected to a single CAN bus, thereby reducing the load rate of the CAN bus, avoiding the periodic communication interruption of the power module, and ensuring the stability of the output current. At the same time, by ensuring the stability of communication, the coordination control failure between the power modules caused by the excessively high load rate of the CAN bus is effectively avoided, and the local overload or uneven charging of the charging equipment is prevented, thereby eliminating the safety hazards such as overheating of the charging equipment and battery damage, especially the safety risks in high-power and fast charging scenarios.

[0017] At the same time, the control method of the present application automatically calculates the number of main power modules and sub-power modules required according to the power demand parameters, and accurately controls them through the hierarchical communication network. This control method not only ensures that the power output meets the demand, but also can flexibly call the modules according to actual needs, thereby improving the system operation efficiency.

[0018] Since the communication tasks carried by each CAN bus are reasonably distributed, communication congestion is avoided, ensuring that each power module can communicate continuously and stably, eliminating the output current jump phenomenon, achieving stable current output control, and providing safe and reliable protection for the charging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the topology of the distributed power module CAN communication network provided for this application;

[0020] Figure 2 It is a schematic diagram of the topological structure of the CAN communication network of the distributed power module in the prior art;

[0021] Figure 3 A schematic flow chart of a power module control method provided in the present application.

[0022] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain preset posture (as shown in the accompanying drawings). If the preset posture changes, the directional indication will also change accordingly.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] In the field of high-power power equipment, it is often necessary to convert AC power into DC power. This conversion is achieved through power modules. Each power module has a CAN communication interface for data exchange and can output DC voltage or current. The capacity of a single module is 15kW. As application requirements develop, the power required for high-power power equipment continues to increase. Taking electric vehicle charging devices as an example, the power demand has grown from 300-600kW to 900kW-1200kW. When a capacity of 900kW is required, 60 power modules are required in parallel to meet the demand. Each of these power modules is an independent node, which realizes information exchange through the CAN bus to form a CAN network system. In the prior art, such as Figure 2 As shown in the figure, a centralized CAN network structure is adopted, and all power modules realize information exchange through the same CAN bus. Practice shows that when the number of modules exceeds 50, the CAN bus load rate is too high, resulting in a decrease in communication quality. Specifically, during the 10ms periodic command control process of the host computer, some power modules experience periodic communication interruptions. When the communication is interrupted, the corresponding module stops outputting current; when the communication is restored in the next cycle, normal output is restored. This periodic communication interruption causes significant fluctuations in the overall output current, with a jump value of ±10A, which seriously affects the stability and reliability of the system.

[0028] Embodiment 1, the present application provides a communication network structure, the communication network structure includes multiple power module groups and a hierarchical communication network, the hierarchical communication network includes an inter-group communication network and multiple intra-group communication networks. Wherein, the power module group includes multiple power modules, the multiple power modules include a main power module and multiple sub-power modules; the inter-group communication network is used for the main power module communication between the multiple power module groups, and each of the intra-group communication networks is used for the communication between the main power module and each of the sub-power modules in the corresponding power module group.

[0029] Specifically, if Figure 1 As shown, the communication network structure provided in this embodiment adopts a hierarchical grouping network structure design. Specifically, the communication network includes a plurality of power module groups. Each power module group is provided with a plurality of power modules, and the power modules include a main power module and a plurality of sub-power modules. For example, 10 power modules can be set as a group, wherein the first module is set as the main power module of the group, and the remaining 9 modules are set as sub-power modules.

[0030] The communication network also includes a hierarchical communication network, which is composed of an inter-group communication network and a plurality of intra-group communication networks. The inter-group communication network is used to realize the communication between the main power modules of different power module groups. Specifically, the main power modules of each power module group can exchange information with each other through the inter-group communication network. The intra-group communication network is used to realize the communication within each power module group, that is, the main power module of the group can exchange information with each sub-power module in the group through the intra-group communication network.

[0031] Through the hierarchical and grouped network structure design, the communication tasks are reasonably allocated, and the situation where all modules share the same communication bus is avoided, thereby effectively reducing the load rate of a single communication bus. Since the number of nodes connected to each CAN bus is reduced, communication congestion is avoided, the periodic communication interruption of the power module is eliminated, and it is ensured that each power module can communicate continuously and stably, and the output current is stabilized within ±1A, which effectively solves the problem of output current fluctuation. At the same time, by ensuring the stability of communication, the failure of power module coordination control caused by excessive CAN bus load rate can be prevented, thereby avoiding the possible local overload of equipment and uneven charging during the charging process, eliminating the safety hazards such as overheating of charging equipment and battery damage, and improving the safety and reliability of the charging process.

[0032] As an optional implementation, the main power module includes a first CAN channel and a second CAN channel; the inter-group communication network includes a first CAN bus, and the intra-group communication network includes a second CAN bus; the first CAN channel of each of the main power modules is respectively connected to the first CAN bus, and the first CAN bus is used to transmit communication signals between the main power modules; the second CAN channel of the main power module is connected to each of the corresponding sub-power modules through the second CAN bus, and the second CAN bus is used to transmit communication signals between the sub-power module and the corresponding main power module.

[0033] Specifically, each main power module is provided with two CAN channels, namely a first CAN channel and a second CAN channel. Two CAN buses are provided in the hierarchical communication network: the first CAN bus is used to construct an inter-group communication network, and the second CAN bus is used to construct an intra-group communication network.

[0034] In terms of specific connection methods, the first CAN channel of each main power module is respectively connected to the first CAN bus, and the communication signal transmission between the main power modules is realized through the bus. At the same time, the second CAN channel of each main power module is connected to each sub-power module in its group through the second CAN bus, which is used to realize the communication signal transmission between the main power module and its corresponding sub-power module.

[0035] Through the hierarchical hardware connection structure, physical isolation between inter-group communication and intra-group communication is achieved, providing a reliable hardware foundation for subsequent hierarchical communication control, thereby ensuring the effective implementation of the hierarchical communication network.

[0036] As an optional implementation, the first CAN bus and the second CAN bus both include a CAN_H signal line and a CAN_L signal line; the CAN_H signal line and the CAN_L signal line of the first CAN bus are connected via a terminal resistor on the input side and the output side respectively; the CAN_H signal line and the CAN_L signal line of the second CAN bus are connected via a terminal resistor on the input side and the output side respectively.

[0037] Specifically, the first CAN bus and the second CAN bus each include a CAN_H signal line and a CAN_L signal line.

[0038] For the first CAN bus, each main power module is defined as the first main power module to the Nth main power module in the connection direction of the first CAN bus. The location of the connection end of the first main power module is defined as the input side, and the location of the connection end of the Nth main power module is defined as the output side. A terminal resistor is set on the input side and the output side respectively to connect the CAN_H signal line and the CAN_L signal line.

[0039] For the second CAN bus, the sub-power modules are defined as the first sub-power module to the Mth sub-power module in the connection direction of the second CAN bus. The location of the main power module connection end is defined as the input side, and the location of the Mth sub-power module connection end is defined as the output side. Similarly, a terminal resistor is set on the input side and the output side respectively to connect the CAN_H signal line and the CAN_L signal line.

[0040] By setting terminal resistors at both ends of each CAN bus, signal reflection can be effectively suppressed and communication quality can be improved.

[0041] For example, Figure 1 As shown, the communication network includes multiple power module groups. Among them, power module 1, power module 11, power module 21, power module 31, power module 41, and power module 51 are respectively the main power modules of the corresponding power module groups, and the other power modules corresponding to each main power module are sub-power modules. Each main power module has a first CAN channel and a second CAN channel, and each CAN channel includes a CAN_H channel and a CAN_L channel.

[0042] In the inter-group communication network, the first CAN bus includes a CAN_H signal line and a CAN_L signal line. The connection end of power module 1 is defined as the input side, and the connection end of power module 51 is defined as the output side. On the input side, the CAN_H signal line and the CAN_L signal line of the first CAN bus are connected through a 120Ω terminal resistor; on the output side, the CAN_H signal line and the CAN_L signal line of the first CAN bus are also connected through a 120Ω terminal resistor. The CAN_H channel and the CAN_L channel of the first CAN channel of power module 1 are respectively connected to the CAN_H signal line and the CAN_L signal line of the first CAN bus, and the first CAN channels of power module 11, power module 21, power module 31, power module 41, and power module 51 are also connected to the first CAN bus in the same way, thereby forming an inter-group communication network.

[0043] In the intra-group communication network, the second CAN bus also includes CAN_H signal line and CAN_L signal line. Taking the group where power module 1 is located as an example, the connection end of power module 1 is defined as the input side, and the connection end of the last sub-power module is defined as the output side. On the input side, the CAN_H signal line and CAN_L signal line of the second CAN bus are connected through a 120Ω terminal resistor; on the output side, the CAN_H signal line and CAN_L signal line of the second CAN bus are also connected through a 120Ω terminal resistor. Power module 1 is connected to each sub-power module in the group through its second CAN channel to achieve intra-group communication.

[0044] Through the hierarchical communication network structure, inter-group communication and intra-group communication are realized through different CAN buses, which effectively reduces the number of nodes on a single bus, thereby ensuring the stability of communication. In addition, through the hierarchical communication network structure, it can ensure that the CAN bus load rate is at a reasonable level, ensure the effectiveness of coordinated control between power modules, avoid charging imbalance caused by communication interruption, and prevent safety accidents such as overheating of charging equipment and battery damage.

[0045] Embodiment 2, the present application also provides a control method for a power module, which performs power scheduling based on the communication network, and the method is executed by a power controller, such as Figure 3 As shown, the method includes:

[0046] S1: receiving a power demand signal, and obtaining a power demand parameter according to the power demand signal;

[0047] S2: Calculating the required number of main power modules and the number of sub-power modules to be called according to the multiple power module groups and the power demand parameter;

[0048] S3: Through the hierarchical communication network, corresponding main power modules and sub-power modules are selected for power output according to the calling quantity of the main power modules and the calling quantity of the sub-power modules.

[0049] Specifically, the control method performs power scheduling based on the above-mentioned communication network. First, a power demand signal is received, and a power demand parameter is obtained according to the power demand signal. For example, a power demand signal sent by an electrical device is received, and the required power demand parameters such as power size, voltage, and current are extracted therefrom. Secondly, according to the configuration of multiple power module groups and the acquired power demand parameters, the number of main power module calls and the number of sub-power module calls required to meet the power demand are calculated, thereby determining the specific number of main power modules and sub-power modules that need to be activated. Afterwards, through the above-mentioned hierarchical communication network, according to the calculated number of main power module calls and the number of sub-power module calls, a corresponding number of main power modules and sub-power modules are selected from multiple power module groups for control.

[0050] Through the control method of the power module mentioned above, the required number of modules can be flexibly called according to actual needs, which can not only meet the power demand but also avoid unnecessary module startup. At the same time, due to the use of a hierarchical communication network structure, the main power module communicates through the inter-group communication network, and the sub-power module communicates through the intra-group communication network, which effectively reduces the load rate of the CAN bus, so that the system can accurately send control instructions to the selected main power module and sub-power module, ensuring the timely and accurate transmission of control signals, avoiding the problem of unstable module output current caused by communication interruption, ensuring that each power module continuously and stably outputs current, and realizing stable operation of the entire system. At the same time, through the control method of the power module mentioned above, the output state of each power module is accurately controlled to ensure the balance and stability of the charging process, prevent potential safety hazards during the charging process, and improve the safety of the charging system.

[0051] As an optional implementation manner, calculating the required number of main power module calls and the number of sub-power module calls according to the multiple power module groups and the power demand parameter includes:

[0052] S21: Obtain the maximum output current of each main power module and each sub-power module, as well as the total amount of main power modules, the total amount of sub-power modules, the distributed maximum total current and the distributed total power of the communication network;

[0053] S22: based on the power demand parameter, obtaining required power and required current;

[0054] S23: When the distributed total power is less than or equal to the required power, the number of main power modules to be called is the total number of main power modules, and the number of sub-power modules to be called is the total number of sub-power modules;

[0055] S24: When the distributed total power is greater than the required power, the number of main power modules to be called and the number of sub-power modules to be called are determined according to the maximum output current of each main power module, the maximum output current of each sub-power module, the total number of main power modules, the total number of sub-power modules, the distributed maximum total current and the required current.

[0056] Specifically, when calculating the required number of main power modules and sub-power modules to be called according to the power module group and power demand parameters, first, according to the configuration of multiple power module groups, obtain the maximum output current of each main power module and each sub-power module, as well as the total number of main power modules, the total number of sub-power modules, the distributed maximum total current and the distributed total power of the communication network. Among them, the total number of main power modules refers to the total number of main power modules in multiple power module groups; the total number of sub-power modules refers to the total number of sub-power modules in multiple power module groups; the distributed maximum total current refers to the maximum total current that multiple power module groups can provide; the distributed total power refers to the total power that multiple power module groups can provide.

[0057] At the same time, the specific required power and required current are extracted from the received power demand parameters. The required power refers to the actual power required by the power-consuming equipment; the required current refers to the current required to meet the power demand. For example, in the electric vehicle charging scenario, the 2015 charging standard requires the current not to exceed 250A, the 2015+ charging standard requires the current not to exceed 800A, and the CHAdeMO charging standard requires the current not to exceed 200A.

[0058] Then, determine the number of modules to be called according to different situations. When the distributed total power is less than or equal to the required power, it means that all modules need to be called to meet the power demand. At this time, the number of main power module calls is set to the total number of main power modules, and the number of sub-power module calls is set to the total number of sub-power modules. When the distributed total power is greater than the required power, it means that the power demand can be met without calling all modules. At this time, according to the maximum output current of each main power module and each sub-power module, the total number of main power modules, the total number of sub-power modules, the distributed maximum total current, and the required current, the required number of main power module calls and sub-power module calls are calculated to achieve on-demand calls.

[0059] Through the call strategy based on different situations, it can ensure that enough modules are called to meet the demand when the power demand is large, and avoid unnecessary module startup when the power demand is small. At the same time, due to the use of a hierarchical communication network structure, control instructions can be sent to the selected main power module through the inter-group communication network, and then the main power module distributes instructions to the sub-power modules in its group through the intra-group communication network. This hierarchical control method not only reduces the load rate of the CAN bus, but also avoids the problem of unstable module output current caused by communication interruption, ensuring the continuous and stable output of each power module, thereby improving the operating efficiency of the system.

[0060] As an optional implementation manner, the maximum output current of the main power module and the maximum output current of the sub-power module are the same; the determining the main module call quantity and the sub-module call quantity according to the maximum output current of each main power module, the maximum output current of each sub-power module, the total number of main modules, the total number of sub-modules, the distributed maximum total current and the demand current includes:

[0061] S241: Determine the total amount of power modules according to the total amount of the main power modules and the total amount of the sub-power modules;

[0062] S242: Obtaining preset call constraint conditions;

[0063] S243: Determine the calling quantity of the main power module based on the calling constraint condition, the demand current, the distributed maximum total current and the total number of power modules;

[0064] S244: Determine the number of sub-power modules to be called based on the call constraint conditions, the demand current, the maximum output current of each power module, the total number of power modules and the number of main power modules to be called.

[0065] Specifically, the maximum output current of the main power module and the maximum output current of the sub-power module are the same. When the distributed total power is greater than the required power, first, the total amount of the main power module and the total amount of the sub-power module are added to obtain the total number of all available power modules as the total amount of power modules, providing basic parameters for subsequent module call calculations. At the same time, the preset call constraints are obtained to ensure the rationality of the module call, for example, the number of main power module calls and the number of sub-power module calls cannot exceed their corresponding total amounts.

[0066] Then, based on the call constraints, demand current, distributed maximum total current and total number of power modules, the number of main power modules to be called is determined. The specific calculation formula is:

[0067]

[0068] Among them, n11 The number of calls to the main power module, I 1 is the demand current, I 总 is the maximum total current of the distributed system, and N is the total number of power modules. Specifically, the ratio of the demand current to the maximum total current of the distributed system is first calculated, and then multiplied by the total number of power modules to obtain the number of main power module calls. At the same time, the max function is used to ensure that at least one main power module is called to ensure the basic operation requirements of the system.

[0069] Next, based on the call constraint conditions, the required current, the maximum output current of the main power module and the sub-power module, the total number of power modules and the number of main power module calls, the number of sub-power module calls is determined. The specific calculation formula is:

[0070]

[0071] Among them, n 21 The number of calls for the sub-power module, I 单 is the maximum output current of each power module, including the main power module and the sub-power module. The maximum output current of each main power module and each sub-power module is the same. Specifically, first calculate n 11 ×I 单 Get the total current that the main power module can provide, and divide it from the required current I 1 Subtract from I to get 1 -(n 11 ×I 单 ), that is, the current value that needs to be provided by the sub-power module, divided by the required current I 1 Get the current ratio that needs to be supplemented by the sub-power module, and finally multiply it by the total number of power modules N to get the number of sub-power modules that need to be called n 21 .

[0072] The above method is used to determine the number of calls to the main power module and the number of calls to the sub-power module. While ensuring that the required power is met, some modules are prohibited from being called, thereby avoiding unnecessary module startup. At the same time, due to the use of a hierarchical communication network structure, control instructions can be sent to the selected main power module through the inter-group communication network, and then the main power module distributes instructions to the sub-power modules in its group through the intra-group communication network. This hierarchical control method not only reduces the load rate of the CAN bus, but also avoids the problem of unstable module output current caused by communication interruption, ensures the continuous and stable output of each power module, and eliminates safety hazards such as overvoltage and overcurrent that may occur during the charging process, thereby improving the operating efficiency and safety of the system.

[0073] As an optional implementation, the call constraint conditions are: the number of main power modules called is less than or equal to the total number of main power modules, the number of sub-power modules called is less than or equal to the total number of sub-power modules, and the demand current is less than or equal to the corresponding specified maximum current.

[0074] Specifically, the call constraint condition is used to constrain the call of the power module when determining the number of calls of the main power module and the number of calls of the sub-power module, so as to ensure the rationality of the call of the power module. Among them, the number of calls of the main power module cannot exceed the total number of main power modules in the communication network, ensuring that the number of calls is within the available range; the number of calls of the sub-power module cannot exceed the total number of sub-power modules in the communication network, ensuring that the number of calls does not exceed the number of sub-power modules actually available. At the same time, the demand current must be less than or equal to the corresponding maximum current limit. For example, the 2015 charging standard stipulates that the maximum current is 250A, the 2015+ charging standard stipulates that the maximum current is 800A, and the CHAdeMO charging standard stipulates that the maximum current is 200A. For example, when the 2015 charging standard is adopted, if the demand current is 500A, when using the demand circuit to calculate the number of module calls, the demand current is set to 250A to ensure that the demand current is less than or equal to the corresponding maximum current; if the demand current is 200A, since it is less than the maximum current limit of the 2015 charging standard, the demand current is set to 200A.

[0075] By using the preset call constraints, it can be ensured that the number of power module calls is always kept within a reasonable range when calculating the number of power module calls, avoiding the situation where the number of calls exceeds the actual number of available modules, thereby ensuring the reliability of the control method.

[0076] In the third embodiment, the present application also provides a power controller, which is used to: receive a power demand signal, and obtain a power demand parameter based on the power demand signal; calculate the required number of main power module calls and the number of sub-power module calls based on the multiple power module groups and the power demand parameters; and through the hierarchical communication network, select the corresponding main power module and sub-power module for power output based on the number of main power module calls and the number of sub-power module calls.

[0077] As an optional implementation, the power controller is also used to: obtain the maximum output current of each main power module and each sub-power module and the total number of main power modules, the total number of sub-power modules, the distributed maximum total current and the distributed total power of the communication network; obtain the required power and the required current based on the power demand parameters; when the distributed total power is less than or equal to the required power, the number of main power modules called is the total number of main power modules, and the number of sub-power modules called is the total number of sub-power modules; when the distributed total power is greater than the required power, the number of main power modules called and the number of sub-power modules called are determined according to the maximum output current of each main power module, the maximum output current of each sub-power module, the total number of main power modules, the total number of sub-power modules, the distributed maximum total current and the required current.

[0078] As an optional implementation, the maximum output current of the main power module and the maximum output current of the sub-power module are the same; the power controller is also used to: determine the total number of power modules based on the total number of main power modules and the total number of sub-power modules; obtain preset call constraints; determine the number of main power module calls based on the call constraints, the demand current, the distributed maximum total current and the total number of power modules; determine the number of sub-power module calls based on the call constraints, the demand current, the maximum output current of each power module, the total number of power modules and the number of main power module calls.

[0079] As an optional implementation, the call constraint conditions include: the number of main power modules called is less than or equal to the total number of main power modules, the number of sub-power modules called is less than or equal to the total number of sub-power modules, and the demand current is less than or equal to the corresponding specified maximum current.

[0080] In a fourth embodiment, the present application provides a charging system, including a communication network structure and a power controller, wherein the power controller is used to obtain a power demand signal of a charging device, and output power based on the power demand signal using the communication network structure.

[0081] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A communication network structure, characterized in that: include: A plurality of power module groups, each of which comprises a main power module and a plurality of sub-power modules; The hierarchical communication network includes an inter-group communication network and a plurality of intra-group communication networks, wherein the inter-group communication network is used for the main power module communication between the plurality of power module groups, and the intra-group communication network is used for the main power module to communicate with each of the sub-power modules within the power module group.

2. The communication network structure according to claim 1, characterized in that: The main power module includes a first CAN channel and a second CAN channel; the inter-group communication network includes a first CAN bus, and the intra-group communication network includes a second CAN bus; The first CAN channel of each of the main power modules is respectively connected to the first CAN bus, and the first CAN bus is used to transmit communication signals between the main power modules; The second CAN channel of the main power module is connected to each of the corresponding sub-power modules through the second CAN bus, and the second CAN bus is used to transmit communication signals between the sub-power modules and the corresponding main power modules.

3. The communication network structure according to claim 2, characterized in that: The first CAN bus and the second CAN bus both include a CAN_H signal line and a CAN_L signal line; The CAN_H signal line and the CAN_L signal line of the first CAN bus are connected via a terminal resistor at the input side and the output side respectively; The CAN_H signal line and the CAN_L signal line of the second CAN bus are connected via a terminal resistor at the input side and the output side respectively.

4. A method for controlling a power module, characterized in that: Power scheduling is performed based on the communication network structure according to any one of claims 1 to 3, and the method is executed by a power controller, and the method includes: receiving a power demand signal, and acquiring a power demand parameter according to the power demand signal; Calculate the required number of main power module calls and the number of sub-power module calls according to the multiple power module groups and the power demand parameter; Through the hierarchical communication network, the corresponding main power module and sub-power module are selected for power output according to the calling quantity of the main power module and the calling quantity of the sub-power module.

5. The method according to claim 4, characterized in that Calculating the required number of main power module calls and the number of sub-power module calls according to the multiple power module groups and the power demand parameter includes: Obtain the maximum output current of each main power module and each sub-power module, as well as the total amount of main power modules, total amount of sub-power modules, distributed maximum total current and distributed total power of the communication network; Based on the power demand parameter, obtaining the required power and the required current; When the distributed total power is less than or equal to the required power, the number of main power modules called is the total number of main power modules, and the number of sub-power modules called is the total number of sub-power modules; When the distributed total power is greater than the required power, the number of main power modules to be called and the number of sub-power modules to be called are determined according to the maximum output current of each main power module, the maximum output current of each sub-power module, the total number of main power modules, the total number of sub-power modules, the distributed maximum total current and the required current.

6. The method according to claim 5, characterized in that The maximum output current of the main power module and the maximum output current of the sub-power module are the same; determining the calling quantity of the main power module and the calling quantity of the sub-power module according to the maximum output current of each main power module, the maximum output current of each sub-power module, the total amount of the main power modules, the total amount of the sub-power modules, the distributed maximum total current and the demand current, comprises: Determine the total amount of power modules according to the total amount of the main power modules and the total amount of the sub-power modules; Get the preset call constraints; Determining the calling quantity of the main power module based on the calling constraint condition, the demand current, the distributed maximum total current and the total number of power modules; The calling quantity of the sub-power modules is determined based on the calling constraint conditions, the demand current, the maximum output current of each power module, the total number of power modules and the calling quantity of the main power modules.

7. The method according to claim 6, characterized in that The call constraints include: The calling quantity of the main power modules is less than or equal to the total number of the main power modules, the calling quantity of the sub-power modules is less than or equal to the total number of the sub-power modules, and the demand current is less than or equal to the corresponding specified maximum current.

8. A power controller, characterized in that: The power controller is used for: receiving a power demand signal, and acquiring a power demand parameter according to the power demand signal; Calculate the required number of main power module calls and the number of sub-power module calls according to the multiple power module groups and the power demand parameters; And through the hierarchical communication network, the corresponding main power module and sub-power module are selected for power output according to the calling number of the main power module and the calling number of the sub-power module.

9. The power controller according to claim 8, characterized in that: The power controller is also used for: Obtain the maximum output current of each main power module and each sub-power module, as well as the total amount of main power modules, total amount of sub-power modules, distributed maximum total current and distributed total power of the communication network; Based on the power demand parameter, obtaining the required power and the required current; When the distributed total power is less than or equal to the required power, the number of main power modules called is the total number of main power modules, and the number of sub-power modules called is the total number of sub-power modules; When the distributed total power is greater than the required power, the number of main power modules to be called and the number of sub-power modules to be called are determined according to the maximum output current of each main power module, the maximum output current of each sub-power module, the total number of main power modules, the total number of sub-power modules, the distributed maximum total current and the required current.

10. A charging system, characterized in that: include: The communication network structure according to any one of claims 1 to 3; The power controller according to claim 8 or 9; in, The power controller is used to obtain a power demand signal of a charging device, and output power based on the power demand signal using the communication network structure.

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