A hierarchical busbar type flexible charging system

Abstract

The present invention discloses a hierarchical bus type flexible charging system, which includes: at least one extended bus and at least two power matrices; each power matrix includes at least one power module and at least two matrix buses, the power module outputs current through the matrix buses, at least two matrix buses include a power supply bus and a borrowed bus, each power supply bus is respectively connected to a charging gun, the borrowed bus is connected to the extended bus through an extended output controllable switch, the extended bus is connected to the power supply input end of the power matrix through an extended input controllable switch, and a controllable switch is respectively connected between the power supply input end and each charging gun. The charging system provided by the present invention requires fewer controllable switches, so the cost is lower, the assembly efficiency is higher, and the system expansion is more convenient; and in this system, the buses are divided into two levels, namely the extended bus and the matrix bus, and the buses are hierarchically managed, and the network configuration of the charging station is more flexible.

Description

Technical Field

[0001] The present invention relates to the technical field of charging, and particularly relates to a hierarchical bus type flexible charging system. Background Art

[0002] High-power charging is an important trend. However, there are significant differences in individual charging power requirements. The charging power is affected by factors such as temperature and internal battery level, and the charging power requirements vary greatly each time. Independent operation of individual charging modules will cause great waste. In order to improve the utilization rate of charging modules, the current matrix-type charging piles use a large number of controllable switches. For example, Figure 1 As shown in the traditional matrix-type charging system, all power modules are switched to all charging guns in the system. For example, if there are a charging guns and b power modules, then the number of controllable switches required for the system is a * b. When the system has a large-scale topology, it will cause a geometric increase in the number of controllable switches, an increase in components, resulting in a significant increase in cost, and the risk of charging pile failure also increases accordingly. Summary of the Invention

[0003] In order to solve the problems of the prior art, an embodiment of the present invention provides a hierarchical bus type flexible charging system. The technical solution is as follows:

[0004] An embodiment of the present invention provides a hierarchical bus type flexible charging system, which includes: at least one extended bus and at least two power matrices; each power matrix includes at least one power module and at least two matrix buses. The power module outputs current through the matrix buses. Among the at least two matrix buses, there are a power supply bus and a borrowed bus. Each power supply bus is respectively connected to a charging gun. The borrowed bus is connected to the extended bus through an extended output controllable switch. The extended bus is connected to the power supply input end of the power matrix through an extended input controllable switch. A controllable switch is respectively connected between the power supply input end and each charging gun.

[0005] Optionally, in any one of the power matrices, a controllable switch is respectively connected between any one of the power modules and each of the matrix buses.

[0006] Optionally, the borrowed bus is respectively connected to each of the extended buses through one of the extended output controllable switches;

[0007] Correspondingly, each extended bus is respectively connected to the power supply input end through one of the extended input controllable switches.

[0008] Optionally, the number of the extended buses is the same as the number of the power matrices;

[0009] Correspondingly, the i-th extended bus is connected to the power supply input end of the i-th power matrix through one of the extended input controllable switches. For the i-th power matrix, the borrowed bus and the other extended buses except the i-th extended bus are respectively connected through one of the extended output controllable switches, where i = 1, 2,..., I, and I is the number of extended buses.

[0010] Optionally, for any one of the power matrices, by controlling the opening and closing of the controllable switches therein, the power modules in the power matrix are controlled to supply power to the target charging gun, so as to realize the independent operation of the power matrix.

[0011] Optionally, when the target charging gun needs multiple power matrices to supply power to it jointly, the power borrowing between the power matrices is realized through the extended bus.

[0012] Optionally, when one extended bus cannot meet the current-carrying requirement, by controlling the opening and closing of the extended output controllable switch and the extended input controllable switch, the output current of each borrowed power matrix is controlled to flow to at least two different extended buses.

[0013] The charging system provided by the embodiment of the present invention requires fewer controllable switches, so the cost is lower, the assembly efficiency is higher, and the system expansion is more convenient; and this system divides the bus into two levels, namely the extended bus and the matrix bus, and the bus is hierarchically managed, and the charging station networking configuration is more flexible; at the same time, the application efficiency of the power module is relatively high, and it can adapt to the current situation and future with large differences in charging power requirements. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings without creative efforts based on these drawings.

[0015] Figure 1 is a circuit schematic diagram of a traditional matrix charging system;

[0016] Figure 2 is a circuit schematic diagram of a hierarchical bus flexible charging system provided by an embodiment of the present invention;

[0017] Figure 3 is a circuit schematic diagram of another hierarchical bus flexible charging system provided by an embodiment of the present invention;

[0018] Figure 4 is a circuit schematic diagram of a power matrix provided by an embodiment of the present invention;

[0019] Figure 5 This is a circuit schematic diagram of another hierarchical bus type flexible charging system provided by an embodiment of the present invention. Specific Embodiments

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will further describe in detail the embodiments of the present invention with reference to the accompanying drawings.

[0021] Refer to Figure 2 , which is a circuit schematic diagram of a hierarchical bus type flexible charging system provided by an embodiment of the present invention. The system includes: at least one extended bus 100 and at least two power matrices 200. Each power matrix 200 includes at least one power module ( Figure 2 not shown) and at least two matrix buses 300. The power module outputs current through the matrix buses 300. Among the at least two matrix buses 300, there are a power supply bus and a borrowing and adjusting bus. Each power supply bus is respectively connected to a charging gun. The borrowing and adjusting bus is connected to the extended bus 100 through an extended output controllable switch. The extended bus 100 is connected to the power supply input terminal P of the power matrix 200 through an extended input controllable switch. A controllable switch is respectively connected between the power supply input terminal P and each charging gun. The controllable switch in this embodiment can be a relay.

[0022] The working principle of the charging system in this embodiment can be summarized as: the power matrix supplies power to the directly connected charging guns through the matrix buses, and at the same time, it can also supply power to other charging guns with demands through the extended bus, so as to achieve power borrowing and adjustment. The charging gun in this embodiment can be a device that is connected to a device to be charged, such as an electric vehicle, and charges the battery of the device to be charged.

[0023] To clearly show the charging system provided by this embodiment, Figure 3 and Figure 4 are taken as examples for illustration. It should be noted that Figure 3 the system circuit diagram shown is for exemplary illustration. The number of charging guns, extended buses, power matrices, and matrix buses can be set according to needs. The embodiments of the present invention do not limit the specific number of charging guns, extended buses, power matrices, and matrix buses. Figure 3The charging system shown includes six charging guns, three extended busbars, and three power matrices. Each power matrix includes three matrix busbars. The six charging guns are: charging gun 11, charging gun 12, charging gun 21, charging gun 22, charging gun 31, and charging gun 32. The three extended busbars are: extended busbar L1, extended busbar L2, and extended busbar L3. The three power matrices are: power matrix 1, power matrix 2, and power matrix 3. The three matrix busbars are matrix busbar 0, matrix busbar 1, and matrix busbar 2. Among them, matrix busbar 0 is a borrowed busbar, and matrix busbar 1 and matrix busbar 2 are both power supply busbars. Matrix busbar 1 of power matrix 1 is connected to charging gun 11, and matrix busbar 2 is connected to charging gun 12. Matrix busbar 1 of power matrix 2 is connected to charging gun 21, and matrix busbar 2 is connected to charging gun 22. Matrix busbar 1 of power matrix 3 is connected to charging gun 31, and matrix busbar 2 is connected to charging gun 32.

[0024] Referring to Figure 4 , any power module is connected to each matrix busbar through a controllable switch respectively, and the power module outputs current through the matrix busbar. For example, power module 1 is connected to matrix busbar 0 through controllable switch K101, power module 1 is connected to matrix busbar 1 through controllable switch K111, and power module 1 is connected to matrix busbar 2 through controllable switch K121. For any power matrix in the system, any power module is connected to each matrix busbar through a controllable switch respectively, so as to control the power supply of the power module to the target charging gun by controlling the opening and closing of the controllable switch, so as to realize the independent operation of the power matrix. For example, referring to Figure 4 the power matrix 1 shown, when it is necessary to supply power to charging gun 11, the controllable switches K111, K112,..., K11n can be closed to connect each power module to matrix busbar 1, so that the power is output to charging gun 11 through matrix busbar 1. Each power cabinet can be configured with a power matrix, that is to say, the embodiments of the present invention can realize the independent operation of a single power cabinet and are not affected by other power cabinets.

[0025] When a certain target charging gun requires a large power output, that is, when multiple power matrices need to supply power to it together, the power borrowing between power matrices (power cabinets) can be realized through the extended busbar. As Figure 2 shown, the circuit structure for realizing the power borrowing between power matrices is: the borrowed busbar in power matrix 200 is connected to the extended busbar 100 through an extended output controllable switch, and the extended busbar 100 is connected to the power supply input terminal P through an extended input controllable switch. Further, the borrowed busbar in each power matrix 200 can be connected to each extended busbar 100 through an extended output controllable switch respectively. Correspondingly, each extended busbar 100 can be connected to the power supply input terminal P through an extended input controllable switch respectively. Taking Figure 3Taking the power matrix 1 in [the relevant context] as an example, a borrowed bus is introduced. That is, matrix bus 0 is connected to extended bus 1 through extended output controllable switch K111, matrix bus 0 is connected to extended bus 2 through extended output controllable switch K211, and matrix bus 0 is connected to extended bus 3 through extended output controllable switch K311. Correspondingly, extended bus 1 is connected to power supply input terminal P through extended input controllable switch K110, extended bus 2 is connected to power supply input terminal P through extended input controllable switch K210, and extended bus 3 is connected to power supply input terminal P through extended input controllable switch K310.

[0026] Furthermore, each of the said extended buses is respectively connected to the power supply input terminal P through different ones of the said extended input controllable switches. For example, as Figure 2 shown, optionally, each of the said extended buses is respectively connected to the power supply input terminal through different ones of the said extended input controllable switches. That is to say, the extended input controllable switches do not need to correspond one by one with the extended buses, and two or three extended buses can be connected to the power supply input terminal P through the same extended input controllable switch. For example, extended bus 1 and extended bus 2 are connected to the power supply input terminal P through the same extended input controllable switch, and at the same time, extended bus 3 is connected to the power supply input terminal P through another extended input controllable switch.

[0027] The power supply input terminal P and each charging gun are respectively connected through controllable switches. For example, as Figure 2 shown, the power supply input terminal P is connected to charging gun 11 through controllable switch K110, and the power supply input terminal P is connected to charging gun 12 through controllable switch K120.

[0028] The borrowed bus of each power matrix is connected to the charging gun through the extended bus, so as to realize power supply to the charging guns other than those directly connected to this power matrix. For example, when charging gun 11 requires a large power output, it can be provided by power matrix 2 and power matrix 3; by closing the controllable switches in power matrix 2 and power matrix 3 that are connected to matrix bus 0, the power modules are connected to matrix bus 0; if extended bus L1 is selected, power matrix 2 is connected to extended bus L1 through the closed extended output controllable switch K121, and power matrix 3 is connected to extended bus L1 through the closed extended output controllable switch K131; close the extended input controllable switch K110 and controllable switch K110 to output power to charging gun 11.

[0029] When the charging power demand is relatively large and a single extended bus cannot meet the current-carrying requirement, the on / off states of the extended output controllable switch and the extended input controllable switch can be controlled to direct the output current of each borrowed power matrix to at least two different extended buses. For example, extended bus 1 and extended bus 2 can be selected for current-carrying. The power matrix 2 can be connected to extended bus 1 through the closed K121 extended input controllable switch, and the power matrix 3 can be connected to extended bus 2 through the closed K231 extended input controllable switch. By closing the K110 extended output controllable switch, the extended output controllable switch K210, and the controllable switch K110, the power can be output to the charging gun 11.

[0030] In another simplified solution, the borrowed bus does not need to be connected to each extended bus. Correspondingly, the power supply input terminal P also does not need to be connected to each extended bus. In this simplified solution, the number of extended buses is the same as the number of power matrices. This simplified solution can use fewer switches. The specific solution is as follows: The i-th extended bus is connected to the power supply input terminal of the i-th power matrix through an extended input controllable switch. For the i-th power matrix, the borrowed bus is connected to the remaining extended buses except the i-th extended bus through an extended output controllable switch respectively, where i = 1, 2,..., I, and I is the number of extended buses.

[0031] Specifically, Figure 5 Taking the charging system shown with 3 extended buses and 3 power matrices as an example for illustration. The borrowed bus of power matrix 1, i.e., matrix bus 0, is connected to extended bus 2 through the extended output controllable switch K211, and matrix bus 0 is connected to extended bus 3 through the extended output controllable switch K311. Extended bus 1 is connected to the power supply input terminal P of power matrix 1 through the extended input controllable switch K110. The borrowed bus of power matrix 2, i.e., matrix bus 0, is connected to extended bus 1 through the extended output controllable switch K121, and matrix bus 0 is connected to extended bus 3 through the extended output controllable switch K321. Extended bus 2 is connected to the power supply input terminal P of power matrix 2 through the extended input controllable switch K220. The borrowed bus of power matrix 3, i.e., matrix bus 0, is connected to extended bus 1 through the extended output controllable switch K131, and matrix bus 0 is connected to extended bus 2 through the extended output controllable switch K231. Extended bus 3 is connected to the power supply input terminal P of power matrix 3 through the extended input controllable switch K330. When the charging gun 11 needs to borrow power from power matrix 2 and power matrix 3, the extended input controllable switch K121, the extended input controllable switch K131, the extended output controllable switch K110, and the controllable switch K11 can be closed to direct the power output from power matrix 2 and power matrix 3 to extended bus 1, and then the power is output to the charging gun 11 through extended bus 1.

[0032] Compared with the traditional matrix charging system, the charging system provided by the embodiments of the present invention requires fewer controllable switches. Taking each power matrix including 10 power modules and 6 charging guns as an example, Figure 3 the shown charging system includes 114 (3*(30 + 6 + 2)) controllable switches; while the traditional matrix charging system requires 180 (6*30) controllable switches, reducing the number of controllable switches by nearly 36%; and Figure 5 the shown simplified charging system includes 105 (3*(30 + 3 + 2)) controllable switches, requiring even fewer controllable switches; if a larger system is expanded according to the topological structure shown in the embodiments of the present invention, the advantages will be more obvious.

[0033] The charging system provided by the embodiments of the present invention requires fewer controllable switches, so the cost is lower, the assembly efficiency is higher, and it is more convenient for system expansion; and this system divides the bus into two levels, namely the extended bus and the matrix bus, and the bus is hierarchically managed, making the charging station networking configuration more flexible; at the same time, the application efficiency of the power module is relatively high, and it can adapt to the current and future situations where the charging power requirements vary greatly.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hierarchical bus-type flexible charging system, characterized in that, the system includes: at least one extended bus and at least two power matrices; each of the power matrices includes at least one power module and at least two matrix buses, the power module outputs current through the matrix buses, and among the at least two matrix buses, there are a power supply bus and a borrowed bus, each power supply bus is respectively connected to a charging gun, the borrowed bus is connected to the extended bus through an extended output controllable switch, the extended bus is connected to the power supply input end of the power matrix through an extended input controllable switch, and a controllable switch is respectively connected between the power supply input end and each charging gun; the borrowed bus is respectively connected to each of the extended buses through one of the extended output controllable switches; correspondingly, each of the extended buses is respectively connected to the power supply input end through one of the extended input controllable switches; when one extended bus cannot meet the current-carrying requirement, the on / off of the extended output controllable switch and the extended input controllable switch can be controlled to control the output current flow of each borrowed power matrix to at least two different extended buses; the number of the extended buses is the same as the number of the power matrices.

2. The system according to claim 1, characterized in that, in any one of the power matrices, any one of the power modules is respectively connected to each of the matrix buses through a controllable switch.

3. The system according to claim 1, characterized in that, correspondingly, the i-th extended bus is connected to the power supply input end of the i-th power matrix through one of the extended input controllable switches. For the i-th power matrix, the borrowed bus is respectively connected to the remaining extended buses except the i-th extended bus through one of the extended output controllable switches, where i = 1, 2,..., I, and I is the number of extended buses.

4. The system according to claim 2, characterized in that, for any one of the power matrices, by controlling the on / off of the controllable switch therein, the power module in the power matrix is controlled to supply power to the target charging gun to realize the independent operation of the power matrix.

5. The system according to claim 1, characterized in that, when the target charging gun needs multiple power matrices to supply power to it jointly, power borrowing between the power matrices is realized through the extended bus.

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