Power distribution method, system and terminal equipment of vehicle charger system

Abstract

The present invention proposes a power allocation method for an on-board charger system, the method comprising the following steps: obtaining the required current of the battery; determining the first number of chargers to be turned off by a first redundant calculation, and turning off the chargers corresponding to the first number to be turned off; and allocating the required current of the battery to the output of each turned-on charger. The power allocation method for an on-board charger system proposed by the present invention turns off unnecessary chargers through redundant calculation, avoids all chargers working in a low current state for a long time when the battery demand is low, improves the efficiency of the on-board charger system, reduces the loss of the on-board charger system, and prolongs the life of the on-board charger system.

Description

Technical Field

[0001] The present invention belongs to the technical field of on-board chargers, and in particular relates to a power distribution method, system and terminal equipment of an on-board charger system. Background Art

[0002] At present, with the development of electric vehicles, the application of on-board chargers is becoming more and more widespread. Due to the limitations of the single-unit capacity and space volume of on-board chargers, the two-stage parallel on-board charger system has become a trend. The two-stage parallel on-board charger system is that multiple power modules in the charger are centrally connected in parallel, and multiple chargers are distributed in parallel.

[0003] Traditional on-board charger systems use the vehicle battery management system's average distribution method to distribute power, but this will cause all chargers and power modules in the system to work in a low current state for a long time when the battery demand is small, resulting in low efficiency, high loss, and shortened life.

[0004] Therefore, the traditional technical solutions have the problems of low efficiency, high loss and shortened life of the on-board charger system. Summary of the invention

[0005] The purpose of the present invention is to provide a power distribution method, system and terminal device of an on-board charger system, aiming to solve the problems of low efficiency, high loss and shortened life of traditional on-board charger systems.

[0006] A first aspect of an embodiment of the present invention provides a power distribution method for a vehicle charger system, the method comprising the following steps:

[0007] Get the battery demand current;

[0008] Determine a first number of chargers to be shut down by a first redundant calculation, and shut down the chargers corresponding to the first number of chargers to be shut down;

[0009] The required current of the battery is distributed to each of the charger outputs that are turned on.

[0010] In one embodiment, the formula for calculating the first redundancy is:

[0011] Where i represents the required current of the battery, i n represents the sum of the rated currents of the chargers, n represents the number of the chargers, and x represents the first number of chargers to be turned off.

[0012] In one embodiment, shutting down the chargers corresponding to the first number to be shut down comprises the following steps:

[0013] Arrange the chargers in order from small to large rated current;

[0014] The chargers corresponding to the first number to be shut down are shut down in sequence starting from the charger with the smallest rated current.

[0015] In one embodiment, allocating the required current of the battery to each of the turned-on charger outputs comprises:

[0016] The demand current of the battery is distributed to the outputs of each of the turned-on chargers according to the ratio of the rated current of each of the turned-on chargers to the sum of the rated currents of the turned-on chargers.

[0017] In one embodiment, the method further comprises the following steps:

[0018] Determine a second number of power modules to be turned off in each of the turned-on chargers by a second redundant calculation, and turn off the power modules corresponding to the second number of power modules to be turned off;

[0019] The demand current allocated to each turned-on charger is allocated to the output of each turned-on power module in each turned-on charger.

[0020] In one embodiment, the formula for calculating the second redundancy is:

[0021] where i o represents the demand current allocated to the charger when it is turned on, i k represents the rated current of the charger that is turned on, m represents the number of power modules in the charger that is turned on, and s represents the second number of power modules to be turned off in the charger that is turned on.

[0022] In one embodiment, shutting down the power modules corresponding to the second number to be shut down comprises the following steps:

[0023] Arrange the power modules in the turned-on chargers in order from small to large rated current of the power modules;

[0024] The power modules corresponding to the second number to be shut down are shut down in sequence starting from the power module with the smallest rated current.

[0025] In one embodiment, allocating the demand current allocated to each of the activated chargers to the output of each of the activated power modules in each of the activated chargers comprises:

[0026] The demand current allocated to each turned-on charger is distributed to the output of each turned-on power module in the turned-on charger according to the ratio of the rated current of each turned-on power module in the turned-on charger to the sum of the rated currents of the turned-on power modules in the turned-on charger.

[0027] A second aspect of an embodiment of the present invention provides a vehicle-mounted charger system, comprising a vehicle battery management system and a plurality of chargers respectively connected to the vehicle-mounted battery management system, wherein the chargers are provided with a centralized controller and a plurality of power modules, and the vehicle-mounted charger system is used to implement the method described above.

[0028] A third aspect of an embodiment of the present invention provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method described above when executing the computer program.

[0029] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: the power allocation method of the on-board charger system shuts down unnecessary chargers and power modules through redundant calculation, thereby avoiding that all chargers and power modules operate in a low current state for a long time when the battery demand is small, thereby improving the efficiency of the on-board charger system, reducing the loss of the on-board charger system, and extending the life of the on-board charger system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A schematic diagram of the structure of a first on-board charger system provided by an embodiment of the present invention;

[0032] Figure 2 A schematic flow chart of a first power distribution method for an on-board charger system provided in an embodiment of the present invention;

[0033] Figure 3 A schematic diagram of a process of shutting down the chargers corresponding to the first number to be shut down provided in an embodiment of the present invention;

[0034] Figure 4 A schematic diagram of the structure of a second on-board charger system provided by an embodiment of the present invention;

[0035] Figure 5A schematic flow chart of a second power distribution method for an on-board charger system provided in an embodiment of the present invention;

[0036] Figure 6 A schematic diagram of a process of shutting down the power modules corresponding to the second number to be shut down provided in an embodiment of the present invention;

[0037] Figure 7 A schematic diagram of the structure of a terminal device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] A first aspect of this embodiment provides a power distribution method for a vehicle charger system. The method can be applied to Figure 1 In the vehicle charger system shown. It should be noted that in this system, n chargers are connected in parallel to supply power to the vehicle battery in a distributed manner, and the vehicle battery management system can communicate with the n chargers respectively through CAN communication, and the n chargers can communicate with each other. Each charger has a centralized controller, and the charger communicates with the vehicle battery management system through the centralized controller.

[0041] See also Figure 2 , Figure 2 This is a flow chart of a power distribution method for a vehicle charger system provided in this embodiment. Figure 2 As shown, the method comprises the following steps:

[0042] S101. Obtain the required current of the battery.

[0043] In this embodiment, it should be noted that the obtaining of the battery demand current may be that the vehicle battery management system sends the battery demand current to each charger through a centralized controller of each charger.

[0044] S102: Determine a first number of chargers to be shut down through a first redundant calculation, and shut down the chargers corresponding to the first number of chargers to be shut down.

[0045] In this embodiment, it should be noted that the first redundant calculation to determine the first number of chargers to be turned off may be calculated by a centralized controller of a master charger among the chargers, and the master charger is determined by master-slave competition among the chargers, and the closing of the chargers corresponding to the first number to be turned off may also be closed by a centralized controller of the master charger among the chargers. The chargers corresponding to the first number to be turned off may be selected according to a certain rule, may be selected by a user, or may be selected in other ways, and this embodiment does not limit this.

[0046] S103, distributing the required current of the battery to the outputs of the chargers that are turned on.

[0047] In this embodiment, it should be noted that the distribution of the battery demand current to the output of each turned-on charger may be that the vehicle battery management system distributes the battery demand current to the centralized controller of each turned-on charger, and the centralized controller of each turned-on charger controls the output of each turned-on charger. The current output ratio of each turned-on charger may be evenly distributed or not, which is not limited in this embodiment.

[0048] The power allocation method for the on-board charger system provided in this embodiment shuts down unnecessary chargers through the first redundant calculation, and only needs to turn on some chargers, thereby avoiding that all chargers work in a low current state for a long time when the battery demand is small, thereby improving the efficiency of the on-board charger system, reducing the loss of the on-board charger system, and extending the life of the on-board charger system.

[0049] Optionally, the formula for calculating the first redundancy is:

[0050] Where i represents the required current of the battery, i n represents the sum of the rated currents of the chargers, n represents the number of the chargers, and x represents the first number of chargers to be turned off.

[0051] In this embodiment, it should be noted that the rated current of the charger can be obtained through the centralized controller of the charger, and the chargers can communicate with each other to obtain the sum of the rated currents of the chargers. The formula for the first redundant calculation is a rounding formula, that is, if the calculated result contains a decimal, only the integer part is taken.

[0052] Through the first redundant calculation formula, the number of unnecessary chargers can be calculated reasonably, simply and effectively, thereby controlling the specifications and number of chargers turned on in the on-board charger system.

[0053] Alternatively, if Figure 3 As shown, in step S102, shutting down the chargers corresponding to the first number to be shut down includes the following steps:

[0054] S1021. Arrange the chargers in order of their rated currents from small to large.

[0055] In this embodiment, it should be noted that the arrangement of the chargers in order of the rated current of the chargers from small to large may be performed by a centralized controller of a main charger among the chargers.

[0056] S1022: Shut down the chargers corresponding to the first number to be shut down in order, starting from the charger with the smallest rated current.

[0057] In this embodiment, it should be noted that shutting down the chargers corresponding to the first number to be shut down in sequence starting from the charger with the smallest rated current may be performed by a centralized controller of a main charger among the chargers.

[0058] By shutting down the chargers corresponding to the first number to be shut down in sequence starting from the charger with the smallest rated current, unnecessary chargers can be shut down, and only the charger closest to the demand needs to be turned on, thereby improving the efficiency of the on-board charger system.

[0059] Optionally, step S103 of allocating the required current of the battery to each of the turned-on charger outputs includes:

[0060] The demand current of the battery is distributed to the outputs of each of the turned-on chargers according to the ratio of the rated current of each of the turned-on chargers to the sum of the rated currents of the turned-on chargers.

[0061] In this embodiment, it should be noted that each turned-on charger can obtain its rated current through its centralized controller, and each turned-on charger can communicate with each other to obtain the sum of the rated currents of the turned-on chargers, and the vehicle battery management system distributes the required current of the battery to the output of each turned-on charger through the centralized controller of each turned-on charger.

[0062] By allocating the battery demand current to the output of each turned-on charger according to the ratio of the rated current of each turned-on charger to the sum of the rated currents of the turned-on chargers, the battery demand can be intelligently allocated so that the power output of chargers of each specification is as close to their respective rated powers as possible.

[0063] Optionally, the method can also be applied to Figure 4 In the vehicle charger system shown, it should be noted that charger 1 has x power modules, charger 2 has y power modules, and charger n has z power modules, and the current parameters of each power module can be the same or different. The power modules in the charger output current to the charger in a centralized parallel manner, and the centralized controller in the charger can communicate with the power modules.

[0064] like Figure 5 As shown, the method further comprises the following steps:

[0065] S104: Determine a second number of power modules to be turned off in each of the turned-on chargers through a second redundant calculation, and turn off the power modules corresponding to the second number to be turned off.

[0066] In this embodiment, it should be noted that the second redundant calculation to determine the second number of power modules to be turned off in each of the turned-on chargers may be calculated by a centralized controller of each of the turned-on chargers, and the power modules corresponding to the second number to be turned off may be turned off by a centralized controller of each of the turned-on chargers. The power modules corresponding to the second number to be turned off may be selected according to a certain rule, may be selected by the user, or may be selected in other ways, and this embodiment does not limit this.

[0067] S105: Distribute the demand current allocated to each turned-on charger to the output of each turned-on power module in each turned-on charger.

[0068] In this embodiment, it should be noted that the demand current allocated to each turned-on charger to each turned-on power module output in each turned-on charger may be allocated by a centralized controller of each turned-on charger to each turned-on power module output in the turned-on charger. The current output ratio of each turned-on power module may be evenly distributed or not, which is not limited in this embodiment.

[0069] Through the second redundant calculation, unnecessary power modules are turned off, and only some power modules need to be turned on, so as to avoid all power modules working in a low current state for a long time when the battery demand is small, further improving the efficiency of the on-board charger system, reducing the loss of the on-board charger system, and extending the life of the on-board charger system.

[0070] Optionally, a formula for calculating the second redundancy is:

[0071] where i o represents the demand current allocated to the charger when it is turned on, i k represents the rated current of the charger that is turned on, m represents the number of power modules in the charger that is turned on, and s represents the second number of power modules to be turned off in the charger that is turned on.

[0072] In this embodiment, it should be noted that the rated current of the charger that is turned on is the sum of the rated currents of the power modules in the charger that are turned on, and the rated current of the power modules can be obtained through the centralized controller. The formula for the second redundancy calculation is a rounding formula, that is, if the calculated result contains a decimal, only the integer part is taken.

[0073] By using the second redundancy calculation formula, the number of unnecessary power modules can be calculated reasonably, simply and effectively, thereby controlling the specifications and number of power modules turned on in the on-board charger system.

[0074] Alternatively, if Figure 6 As shown, in step S104, shutting down the power modules corresponding to the second number to be shut down includes the following steps:

[0075] S1041. Arrange the power modules in the turned-on charger in order of the rated current of the power modules from small to large.

[0076] In this embodiment, it should be noted that the power modules in the chargers to be turned on are arranged in order of the rated current of the power modules from small to large, and the arrangement may be performed by a centralized controller of each of the chargers to be turned on.

[0077] S1042: Shut down the power modules corresponding to the second number to be shut down in sequence, starting from the power module with the smallest rated current.

[0078] In this embodiment, it should be noted that shutting down the power modules corresponding to the second number to be shut down in sequence starting from the power module with the smallest rated current may be performed by a centralized controller of each turned-on charger.

[0079] By shutting down the power modules corresponding to the second number to be shut down in sequence starting from the power module with the smallest rated current, unnecessary power modules can be shut down, and only the power module closest to the demand needs to be turned on, thereby improving the efficiency of the on-board charger system.

[0080] Optionally, step S105 of allocating the demand current allocated to each of the activated chargers to the output of each activated power module in each of the activated chargers comprises:

[0081] The demand current allocated to each turned-on charger is distributed to the output of each turned-on power module in the turned-on charger according to the ratio of the rated current of each turned-on power module in the turned-on charger to the sum of the rated currents of the turned-on power modules in the turned-on charger.

[0082] In this embodiment, it should be noted that each turned-on charger can obtain the sum of the rated currents of the power modules turned on in the turned-on charger through its centralized controller, and the centralized controller of each turned-on charger distributes the demand current allocated to each turned-on charger to the output of each turned-on power module of each turned-on charger.

[0083] By allocating the required current according to the ratio of the rated current of each turned-on power module in the turned-on charger to the sum of the rated currents of the turned-on power modules in the turned-on charger, the power output of power modules of each specification can be made as close to their respective rated powers as possible.

[0084] The following takes the battery demand current of 20A, the on-board charger system has two chargers, charger 1 has three power modules, namely, one 30A / 11KW power module and two 40A / 20KW power modules, and charger 2 has four power modules, namely, two 30A / 11KW power modules and two 40A / 20KW power modules as an example to illustrate the process of the method.

[0085] After obtaining the battery demand current of 20A, the first redundant calculation is performed:

[0086] Determine that the first number of chargers to be turned off is 1;

[0087] Arrange charger 1 and charger 2 in order from small to large rated current:

[0088] Charger 1 rated current = 30 + 40 × 2 = 110A,

[0089] Rated current of charger 2 = 30 × 2 + 40 × 2 = 140A,

[0090] Turn off charger 1 with the smallest rated current in order;

[0091] Distribute the battery's required current of 20A to the output of charger 2;

[0092] By the second redundant calculation:

[0093] Determine that the second to-be-shutdown number of power modules in charger 2 is 3;

[0094] Arrange the four power modules in charger 2 in ascending order of rated current, and shut down two 30A / 11KW modules and one 40A / 20KW module in order;

[0095] The demand current 20A allocated to the charger 2 is allocated to a 40A / 20KW power module output in the charger 2.

[0096] The power distribution method of the on-board charger system provided in this embodiment shuts down unnecessary chargers and power modules through redundant calculations, avoiding all chargers and power modules working in a low current state for a long time when the battery demand is low, thereby improving the efficiency of the on-board charger system, reducing the loss of the on-board charger system, and extending the life of the on-board charger system. It supports parallel mixed operation of on-board charger models with different current parameters and the same voltage specifications, and unequal power distribution. It is applicable to both occasions where the number of power modules in each charger is consistent and also to occasions where they are inconsistent.

[0097] A second aspect of this embodiment provides a vehicle-mounted charger system, including a vehicle battery management system and multiple chargers respectively connected to the vehicle-mounted battery management system, wherein the chargers are provided with a centralized controller and multiple power modules, and the vehicle-mounted charger system is used to implement the method described above.

[0098] A third aspect of this embodiment provides a terminal device, such as Figure 7 As shown, it includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the method as described above when executing the computer program.

[0099] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A power distribution method for a vehicle charger system, characterized in that: The method comprises the following steps: Get the battery demand current; Determine a first number of chargers to be shut down by a first redundant calculation, and shut down the chargers corresponding to the first number of chargers to be shut down; Distributing the required current of the battery to each of the turned-on charger outputs; The method further comprises the steps of: The second number of power modules to be turned off in each of the turned-on chargers is determined by a second redundancy calculation, and the power modules corresponding to the second number to be turned off are turned off. The formula for the second redundancy calculation is: ,in i o Indicates the demand current allocated to the charger when it is turned on, i k Indicates the rated current of the charger that is turned on, m Indicates the number of power modules in the charger that is turned on, s Indicates the second to-be-turned-off number of the power modules in the turned-on charger; Distributing the demand current allocated to each turned-on charger to the output of each turned-on power module in each turned-on charger; The formula for the first redundancy calculation is: ,in i represents the demand current of the battery, i n represents the sum of the rated currents of the chargers, n represents the number of the chargers, x Indicates the first number of chargers to be turned off; The step of shutting down the chargers corresponding to the first number to be shut down comprises the following steps: Arrange the chargers in order from small to large rated current; Turning off the chargers corresponding to the first number to be turned off in sequence, starting from the charger with the smallest rated current; The step of shutting down the power modules corresponding to the second number to be shut down comprises the following steps: Arrange the power modules in the turned-on chargers in order from small to large rated current of the power modules; Shutting down the power modules corresponding to the second number to be shut down in sequence starting from the power module with the smallest rated current; The step of distributing the demand current allocated to each of the turned-on chargers to the output of each of the turned-on power modules in each of the turned-on chargers comprises: The demand current allocated to each turned-on charger is distributed to the output of each turned-on power module in the turned-on charger according to the ratio of the rated current of each turned-on power module in the turned-on charger to the sum of the rated currents of the turned-on power modules in the turned-on charger.

2. The power distribution method of the vehicle charger system according to claim 1, characterized in that: The step of distributing the required current of the battery to each of the turned-on charger outputs comprises: The demand current of the battery is distributed to the outputs of each of the turned-on chargers according to the ratio of the rated current of each of the turned-on chargers to the sum of the rated currents of the turned-on chargers.

3. A vehicle charger system, characterized in that: It comprises a vehicle battery management system and a plurality of chargers respectively connected to the vehicle battery management system, wherein the chargers are provided with a centralized controller and a plurality of power modules, and the vehicle charger system is used to implement the method as claimed in any one of claims 1 to 2.

4. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 2 is implemented.

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