WO2023093083A1

WO2023093083A1 - Charging apparatus and system

Info

Publication number: WO2023093083A1
Application number: PCT/CN2022/106206
Authority: WO
Inventors: 易立琼; 杨泽洲; 陈少娴
Original assignee: 华为数字能源技术有限公司
Priority date: 2021-11-24
Filing date: 2022-07-18
Publication date: 2023-06-01
Also published as: CN114336906A

Abstract

Disclosed in the present application are a charging apparatus and system, which are used for reducing the volume of the charging apparatus. The apparatus comprises: at least one first electric power conversion module, at least one first output apparatus, at least one second electric power conversion module, and at least one second output apparatus, wherein each first electric power conversion module is correspondingly connected to one first output apparatus on a one-to-one basis by means of one first bus and one switch; each second electric power conversion module is correspondingly connected to one second output apparatus on a one-to-one basis by means of one second bus and one switch; and each first bus is respectively connected to each second bus by means of a switch. By means of the apparatus, the number of switches can be reduced, such that the volume of a charging apparatus can be reduced, and the cost of the charging apparatus is thus decreased.

Description

A charging device and system

Cross References to Related Applications

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office of China on November 24, 2021, with application number 202111406527.0 and application name "A Charging Device and System", the entire contents of which are incorporated in this application by reference middle.

technical field

The present application relates to the field of electronic technology, in particular to a charging device and system.

Background technique

With the development of technology, there are more and more devices (for example, electric vehicles, electric vehicles, etc.) that need to be charged. In order to facilitate the use of these devices, corresponding charging devices need to be provided.

Currently, in order to flexibly configure the charging power, a charging device with a full matrix topology can be used. Specifically, the charging device includes: a power conversion module and a charging gun. Wherein, the power conversion module is connected to the busbar of the power conversion module, and the busbar of the power conversion module is connected to the jumper busbar through a controllable switch; the charging gun is connected to the busbar of the charging gun, and the busbar of the charging gun is connected to the jumper busbar through a controllable switch. In this way, the power changing module can provide power for the charging gun, so as to charge the device to be charged connected to the charging gun.

However, when the number of power conversion modules and charging guns is large, the number of busbars and controllable switches is also large, resulting in a high cost of the charging device.

In addition, the controllable switches are mostly switching devices such as contactors, relays, hybrid switches, and short circuits, which are relatively large in size. Therefore, when the number of controllable switches is large, the volume of the charging device is large and takes up a lot of space.

Contents of the invention

Embodiments of the present application provide a charging device and a system to reduce the volume of the charging device.

In the first aspect, an embodiment of the present application provides a charging device, including: at least one first power conversion module, at least one first output device, at least one second power conversion module, and at least one second output device; wherein, each The first power conversion module can be connected to a first output device in a one-to-one correspondence through a first bus bar and a switch; each second power conversion module can be connected in a one-to-one correspondence to a second output device through a second bus bar and a switch; Each first bus is respectively connected to each second bus through a switch.

Wherein, any one of the at least one first output device and/or the at least one second output device may be a charging gun, a charging post or a charging pile.

With this charging device, when the number of at least one first power conversion module is a and the number of at least one second power conversion module is b, the multiple switches between a first bus bars and b second bus bars constitute a The switch matrix of a*b. In the charging device shown in Figure 2 below, when the number of power conversion modules and the number of output devices are both M, the dimension of the switch matrix is M ² , where M=a+b, where a, b and M are all is a positive integer. Therefore, compared with the switch matrix in the charging device shown in FIG. 2 , the dimension of the switch matrix in the charging device provided by the embodiment of the present application is lower, and the number of switches is less.

Moreover, in the charging device provided in the embodiment of the present application, any power conversion module can be connected to any output device through a switch, so as to provide electric energy for any output device. Specifically, any two power conversion modules can be connected in parallel through a switch. Wherein, each first power conversion module can be connected in parallel with each second power conversion module through a switch; every two first power conversion modules can also be connected in parallel through a first target switch, wherein the first target switch is the two A switch between the first power conversion module and any second power conversion module; every two second power conversion modules can also be connected in parallel through a second target switch, wherein the second target switch is the two second power conversion modules A switch between the module and any first power conversion module. Since any two power conversion modules can be connected in parallel through the switch, any power conversion module can provide electric energy for any output device under the control of the switch.

Therefore, the charging device provided by the embodiment of the present application can flexibly provide power to any output device through fewer switches, thereby reducing the number of switches, thereby reducing the volume of the charging device and reducing the cost of the charging device.

In addition, in the charging device, each first power conversion module and a first output device are connected in one-to-one correspondence through a first bus, and each second power conversion module and a second output device are connected through a second bus. One-to-one connection. In other words, the charging device multiplexes the power conversion module busbar and the output device busbar, thereby reducing the number of busbars and further reducing the cost of the charging device.

In a possible design, the charging device may further include: at least one third power conversion module and/or at least one fourth power conversion module. Wherein, each third power conversion module is connected to a third bus bar, and each third bus bar is connected to each second bus bar through a switch; each fourth power conversion module is connected to a fourth bus bar, and each The fourth busbars are respectively connected to each first busbar through switches.

Through this design, each fourth power conversion module can be connected in parallel with each first power conversion module through a switch, so as to provide electric energy for an output device connected to the first power conversion module. Each third power conversion module can be connected in parallel with each second power conversion module through a switch, so as to provide electric energy for an output device connected to the second power conversion module. In this way, when the number of power conversion modules is greater than the number of output devices, the charging device can flexibly provide power to any output device through fewer switches, thereby reducing the number of switches, thereby reducing the volume of the charging device, reducing The cost of the charging unit.

In a possible design, the number of the at least one first power conversion module, the number of the at least one second power conversion module, the number of the at least one third power conversion module and the number of the at least one fourth power conversion module The sum of the numbers is 8; the sum of the numbers of the at least one first output device and the at least one second output device is 6. That is to say, in the charging device, the number of power conversion modules is eight, and the number of output devices is six.

In a possible design, the quantity of the at least one first power conversion module and the quantity of the at least one first output device are both M/2; the quantity of the at least one second power conversion module and the quantity of the at least one second The number of output devices is M/2; wherein, M is a positive integer, and M is an even number.

Optionally, M is 8. That is to say, in the charging device, both the number of power conversion modules and the number of output devices are eight.

With this design, the number of switches in the charging device is M ² /4+M. In the charging device shown in FIG. 2 below, when the number of power conversion modules and the number of output devices are both M, the number of switches is M ² +M. Compared with the charging device shown in FIG. 2 , the charging device in this design can reduce 3*M ² /4 switches, and the number of switches is reduced by about 75%. Therefore, this design can effectively reduce the number of switches, thereby reducing the volume of the charging device and reducing the cost of the charging device.

In a possible design, the number of the at least one first power conversion module and the number of the at least one first output device are both (M+1)/2; the number of the at least one second power conversion module and the The quantity of at least one second output device is (M−1)/2; wherein, M is a positive integer, and M is an odd number.

With this design, the number of switches in the charging device is (M ² /4+M-0.25). In the charging device shown in FIG. 2 below, when the number of power conversion modules and the number of output devices are both M, the number of switches is M ² +M. Compared with the charging device shown in FIG. 2 , the charging device in this design can reduce (3*M ² /4+0.25) switches, that is, the number of switches is reduced by about 75%. Therefore, this design can effectively reduce the number of switches, thereby reducing the volume of the charging device and reducing the cost of the charging device.

In a second aspect, the embodiment of the present application further provides a charging system, including: a transformer and any charging device described above, and two ends of the transformer are respectively connected to a power source and the charging device.

The technical effects that can be achieved in the above second aspect can be described with reference to the technical effects that can be achieved by any possible design in the above first aspect, and the repetition will not be discussed.

Description of drawings

FIG. 1 is a schematic structural diagram of a charging device with a full matrix topology;

Fig. 2 is a structural schematic diagram of another charging device;

FIG. 3 is a schematic structural diagram of a charging device provided in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of an example of a charging device provided in an embodiment of the present application;

Fig. 5 is a schematic structural diagram of another example of a charging device provided in an embodiment of the present application;

FIG. 6 is a schematic structural diagram of another charging device provided in the embodiment of the present application;

Fig. 7 is a schematic structural diagram of an example of another charging device provided in the embodiment of the present application;

Fig. 8 is a schematic diagram of a charging system provided by an embodiment of the present application.

Detailed ways

The present application provides a charging device and system for reducing the volume of the charging device.

According to the solutions provided by the embodiments of the present application, the charging device includes: at least one first power conversion module, at least one first output device, at least one second power conversion module, and at least one second output device. Wherein, each first power conversion module can be connected to a first output device in a one-to-one correspondence through a first bus bar and a switch; each second power conversion module can be connected to a second output device through a second bus bar and a switch. One corresponding connection; each first bus is connected to each second bus through a switch. In this way, a plurality of switches between the a first bus bars and the b second bus bars constitute a switch matrix of a*b. In the charging device shown in Figure 2 below, when the number of power conversion modules and the number of output devices are both M, the dimension of the switch matrix is M ² , where M=a+b, where a, b and M are all is a positive integer. Therefore, compared with the switch matrix in the charging device shown in FIG. 2 , the dimension of the switch matrix in the charging device provided by the embodiment of the present application is lower, and the number of switches is less. Moreover, in the charging device provided by the embodiment of the present application, any at least two power conversion modules can be connected in parallel through a switch, and any power conversion module can provide electric energy for any output device under the control of the switch. Therefore, the charging device provided by the embodiment of the present application can flexibly provide power to any output device through fewer switches, thereby reducing the number of switches, thereby reducing the volume of the charging device and reducing the cost of the charging device.

In the following, some terms used in the embodiments of the present application are explained, so as to facilitate the understanding of those skilled in the art.

1) The power conversion module is a device for converting the electric energy provided by the power supply into electric energy for charging.

The input side of the power conversion module may be connected to a power source; after processing the power provided by the power source, the power conversion module may provide power (eg, power) to an output device. The manner in which the power conversion module processes the electric energy provided by the power supply may include at least one of the following: converting direct current provided by the power supply into alternating current, converting alternating current provided by the power supply into direct current, and so on.

The power conversion module may be a device such as a rectifier or a power converter.

2) The bus bar is a wire used to transmit electric energy, which can connect multiple devices in parallel.

The power conversion module can output electric energy to the output device through the bus bar. When the power conversion module has the ability to convert direct current into alternating current, one bus bar connected to the power conversion module may include a positive bus bar and a negative bus bar. The output terminals of the power conversion module can be respectively connected to the output device through the positive bus bar and the negative bus bar, so as to provide electric energy for the output device.

The bus bar connected to the power conversion module may be called the power conversion module bus bar, and the bus bar connected to the output device may be called the output device bus bar. For example, when the output device is a charging gun, the output device bus may be called a charging gun bus.

In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. "And/or" describes the association relationship of associated objects, indicating that there may be three kinds of relationships, for example, A and/or B may indicate: A exists alone, A and B exist simultaneously, and B exists independently. "At least one (individual) of the following" or similar expressions refer to any combination of these items (individuals), including any combination of a single item (individuals) or a plurality of item (individuals).

In addition, it should be understood that in the description of this application, words such as "first" and "second" are only used to distinguish the purpose of description, and should not be interpreted as indicating or implying relative importance, nor should they be understood as To indicate or imply an order.

In order to provide power flexibly, a charging device with a full matrix topology is currently provided. Figure 1 shows a charging device comprising a full matrix topology. Wherein, each output device is connected to an output device bus bar, and each power conversion module is connected to a power conversion module bus bar; each output device bus bar is connected to a jumper bus bar through a switch, and each power conversion module bus bar is connected to a power conversion module bus bar through a switch. Jumper bus connections. By controlling the closing and opening of the switch, the power conversion module that provides electric energy for the output device can be adjusted, so that the electric energy can be flexibly provided for the output device. When the charging device includes M output devices (for example, output device 1-output device M in FIG. 1 ) and N power conversion modules (for example, power conversion module 1-power conversion module N in FIG. 1 ), and the bridge When the number of busbars (for example, busbar 1-busbar M in FIG. 1 ) is M, the number of switches in the charging device is M*N+ ^M2 .

Although the charging device shown in FIG. 1 can provide electric energy flexibly, it needs more switches and busbars.

In order to reduce the number of switches and busbars, a charging device as shown in Fig. 2 has also been proposed. Wherein, each output device is connected to an output device bus, and each power conversion module is connected to a power conversion module bus; each output device bus is connected to each power conversion module bus through a switch. By controlling the closing and opening of the switch, the power conversion module that provides electric energy for the output device can be adjusted, so that the electric energy can be flexibly provided for the output device. When the charging device includes M output devices (for example, output device 1-output device M in FIG. 2 ) and N power conversion modules (for example, power conversion module 1-power conversion module N in FIG. 2 ), the charging device The number of switches is M*N. In addition, in practical applications, there is usually a switch at the current inlet of each output device. Therefore, in the charging device shown in FIG. 2 , the number of switches is M*N+M.

Compared with the charging device shown in Fig. 1, the charging device shown in Fig. 2 reduces the number of switches and busbars; however, the charging device shown in Fig. 2 still needs more switches and busbars.

In view of this, the present application provides a charging device, which can use fewer switches to provide electrical energy for the output device. Since the number of switches in the charging device is small, the volume of the charging device is also small. Fig. 3 shows a possible structure of the charging device provided by the embodiment of the present application. The charging device includes: at least one first power conversion module, at least one first output device, at least one second power conversion module and at least one second output device.

Each first power conversion module may be connected to a first output device in a one-to-one correspondence through a first bus bar and a switch. That is to say, the at least one first power conversion module may be connected to the at least one first output device in a one-to-one correspondence through a first bus bar and a switch.

Specifically, the at least one first power conversion module is a first power conversion module, which can be respectively recorded as the first power conversion module 1, the first power conversion module 2, ..., the first power conversion module a. The at least one first output device is a first output device, which can be respectively recorded as a first output device 1, a first output device 2, . . . , a first output device a. The number of first busbars is a, and the a first busbars can be respectively recorded as first busbar 1, first busbar 2, . . . , first busbar a. The first power conversion module j may be connected to the first output device j through the first bus j and the switch. Wherein, the switch may be located at the current inlet of the first output device j. Wherein, a and j are positive integers, and j is from 1 to a, that is, 1≤j≤a. In this way, there is only one bus (namely the first bus j) between the first power conversion module j and the first output device j; the first power conversion module j can provide electric energy for the first output device j under the control of the switch.

Each second power conversion module may be connected to a second output device in a one-to-one correspondence through a second bus bar and a switch. That is to say, the at least one second power conversion module may be connected to the at least one second output device in a one-to-one correspondence through a second bus bar and a switch.

Specifically, the at least one second power conversion module is b second power conversion modules, which can be respectively recorded as the second power conversion module 1, the second power conversion module 2, ..., the second power conversion module b. The at least one second output device is b second output devices, which can be respectively recorded as the second output device 1, the second output device 2, . . . , the second output device b. The number of the second busbars is b, and the b second busbars can be respectively recorded as the second busbar 1, the second busbar 2, . . . , the second busbar b. The second power conversion module i may be connected to the second output device i through the second bus bar i and the switch. Wherein, the switch may be located at the current inlet of the second output device i. Wherein, b and i are positive integers, and i takes place from 1 to b, that is, 1≤i≤b. In this way, there is only one bus (namely the second bus i) between the second power conversion module i and the second output device i; the second power conversion module i can provide electric energy for the second output device i under the control of the switch.

Each first bus is respectively connected to each second bus through a switch. That is, the first bus j can be connected to the second bus i through a switch. Among them, j is taken from 1 to a, that is, 1≤j≤a; i is taken from 1 to b, that is, 1≤i≤b.

In this way, any power conversion module can be connected to any output device through a switch, so as to provide electric energy for any output device. Specifically, any two power conversion modules can be connected in parallel through a switch. Wherein, each first power conversion module can be connected in parallel with each second power conversion module through a switch; every two first power conversion modules can be connected in parallel through a first target switch, wherein the first target switch is the two second power conversion modules A switch between a power conversion module and any second power conversion module; every two second power conversion modules can be connected in parallel through a second target switch, wherein the second target switch is the two second power conversion modules and A switch between any of the first power conversion modules. Since any two power conversion modules can be connected in parallel through the switch, any power conversion module can provide electric energy for any output device under the control of the switch. Specifically, any power conversion module can provide electrical energy to the output device connected to it one by one, or can provide electrical energy to the output device by connecting the power conversion module connected to the output device in parallel.

For example, when the switch between the first power conversion module 1 and the first output device 1 is closed, the first power conversion module 1 can provide electric energy for the first output device 1 .

For another example, when the switch 1 in FIG. 3 is closed, the first power conversion module 1 and the second power conversion module 1 are connected in parallel. At this time, if the switch between the first power conversion module 1 and the first output device 1 is closed, the first power conversion module 1 and the second power conversion module 1 can simultaneously provide electric energy for the first output device 1 .

For another example, when the switch 1 and the switch 2 in FIG. 3 are closed, the first power conversion module 1 , the first power conversion module 2 and the second power conversion module 1 are connected in parallel. At this time, if the switch between the first power conversion module 1 and the first output device 1 is closed, the first power conversion module 1 , the first power conversion module 2 and the second power conversion module 1 can be the first output device 1 at the same time. Provide electrical energy.

For another example, when the switch 1 and the switch 3 in FIG. 3 are closed, the first power conversion module 1 , the second power conversion module 1 and the second power conversion module 2 are connected in parallel. At this time, if the switch between the first power conversion module 1 and the first output device 1 is closed, the first power conversion module 1 , the second power conversion module 1 and the second power conversion module 2 can be the first output device 1 at the same time. Provide electrical energy.

Optionally, any one of the at least one first output device and/or the at least one second output device is a charging gun, a charging post or a charging pile. The device to be charged can obtain electric energy through any output device, and the device to be charged can be an electric car, an electric car, etc.

Through the charging device shown in Figure 3, each first power conversion module can be connected to a first output device in a one-to-one correspondence through a first bus bar and a switch; each second power conversion module can be connected through a second bus bar and a switch One-to-one corresponding connection with a second output device; each first bus is respectively connected with each second bus through a switch. In this way, as shown in FIG. 3 , a plurality of switches between a first bus bars and b second bus bars constitute a switch matrix of a*b. In the charging device shown in FIG. 2 , when the number of power conversion modules and the number of output devices are both M, the dimension of the switch matrix is M ² , where M=a+b. Therefore, compared with the switch matrix in the charging device shown in FIG. 2 , the dimension of the switch matrix in the charging device provided by the embodiment of the present application is lower, and the number of switches is less.

Moreover, in the charging device provided in the embodiment of the present application, any two power conversion modules can be connected in parallel through a switch, and any power conversion module can provide power to any output device under the control of the switch. The charging device can flexibly provide power to any output device through fewer switches, thereby reducing the number of switches, thereby reducing the volume of the charging device and reducing the cost of the charging device.

In addition, in the charging device shown in Figure 3, each first power conversion module and a first output device are connected in one-to-one correspondence through a first bus, and each second power conversion module and a second output device are connected through a The second bus bars are connected in one-to-one correspondence. In other words, the charging device multiplexes the busbar of the power conversion module and the busbar of the output device. In the charging device shown in FIG. 2 , the power conversion module and the output device are respectively connected to a bus. Therefore, compared with the charging device shown in FIG. 2, the number of bus bars in the charging device shown in FIG. 3 can be reduced by 50%, thereby reducing the cost of the charging device.

In some possible implementations, a=b. Specifically, when the number of power conversion modules and the number of output devices are both M (that is, a+b=M), and M is an even number, a=b=M/2. Wherein, M is a positive integer.

Fig. 4 shows the structure of a possible example of this implementation. As shown in FIG. 4 , both the number of power conversion modules and the number of output devices are M=8. At this time, a=b=4.

With this implementation, the number of switches in the charging device is M ² /4+M. In the charging device shown in FIG. 2 , when the number of power conversion modules and the number of output devices are both M, the number of switches is M ² +M. Compared with the charging device shown in FIG. 2 , the charging device in this implementation can reduce 3*M ² /4 switches, and the number of switches is reduced by about 75%. Therefore, this implementation can effectively reduce the number of switches, thereby reducing the volume of the charging device and reducing the cost of the charging device.

In other possible implementations, a may not be equal to b.

Optionally, when the number of power conversion modules and the number of output devices are both M (that is, a+b=M), and M is an odd number, a=(M+1)/2, b=(M-1) /2. Wherein, M is a positive integer.

Fig. 5 shows the structure of a possible example of this implementation. As shown in FIG. 5 , the number of power conversion modules and the number of output devices are both M=7, and a=4, b=3.

With this implementation, the number of switches in the charging device is (M ² /4+M-0.25). In the charging device shown in FIG. 2 , when the number of power conversion modules and the number of output devices are both M, the number of switches is M ² +M. Compared with the charging device shown in FIG. 2 , the charging device in this implementation can reduce (3*M ² /4+0.25) switches, that is, the number of switches is reduced by about 75%. Therefore, this implementation can effectively reduce the number of switches, thereby reducing the volume of the charging device and reducing the cost of the charging device.

It should be understood that when M is an even number, a and b may not be equal. When M is an odd number, a and b can also take other values, as long as the sum of a and b is M. For example, a=(M+3)/2, b=(M-3)/2. This application is not limited to this.

Fig. 6 shows another possible structure of the charging device of the embodiment of the present application. As shown in FIG. 6 , on the basis of the charging device shown in FIG. 3 , the charging device may further include: at least one third power conversion module and/or at least one fourth power conversion module.

Each third power conversion module is connected to a third bus; each third bus is respectively connected to each second bus through a switch. In this way, each third power conversion module can be connected in parallel with each second power conversion module through a switch, so as to provide electric energy for an output device connected to the second power conversion module.

Specifically, the at least one third power conversion module is o third power conversion modules, which can be denoted as third power conversion module 1, third power conversion module 2, . . . , third power conversion module o. The number of the third busbars is o, and the o third busbars can be respectively recorded as the third busbar 1, the third busbar 2, . . . , the third busbar o. The third power conversion module k is connected to the third busbar k; the third busbar k may be connected to the second busbar i through a switch. Wherein, k takes from 1 to o, that is, 1≤k≤o; i takes from 1 to b, that is, 1≤i≤b. Among them, o, b, k and i are positive integers.

In this way, the third power conversion module k can be connected in parallel with the second power conversion module i through the third bus k, the switch and the second bus i, so as to provide electric energy for the output device connected to the second power conversion module i. Wherein, the output device connected to the second power conversion module i may be any output device connected to the second power conversion module i through a switch, for example, the second output device i.

Each fourth power conversion module is connected to a fourth busbar; each fourth busbar is connected to each first busbar through a switch. In this way, each fourth power conversion module can be connected in parallel with each first power conversion module through a switch, so as to provide electric energy for an output device connected to the first power conversion module.

Specifically, the at least one fourth power conversion module is p fourth power conversion modules, which can be denoted as fourth power conversion module 1, fourth power conversion module 2, . . . , fourth power conversion module p. The number of the fourth busbars is p, and the p fourth busbars can be respectively recorded as the fourth busbar 1, the fourth busbar 2, . . . , the fourth busbar p. The fourth power conversion module h is connected to the fourth bus h; the fourth bus h may be connected to the first bus j through a switch. Wherein, h takes place from 1 to o, that is, 1≤h≤p; j takes place from 1 to a, that is, 1≤j≤a. Among them, p, a, h and j are positive integers.

In this way, the fourth power conversion module h can be connected in parallel with the first power conversion module j through the fourth bus h, the switch and the first bus j, so as to provide electric energy for the output device connected to the first power conversion module j. Wherein, the output device connected to the first power conversion module j may be any output device connected to the first power conversion module j through a switch, for example, the first output device j.

Optionally, the number of power conversion modules is 8, and the number of output devices is 6 (that is, a+b=6).

Wherein, when the charging device includes at least one first power conversion module, at least one second power conversion module and at least one third power conversion module, a+b+o=8.

When the charging device includes at least one first power conversion module, at least one second power conversion module and at least one fourth power conversion module, a+b+p=8.

When the charging device includes at least one first power conversion module, at least one second power conversion module, at least one third power conversion module and at least one fourth power conversion module, a+b+o+p=8.

FIG. 7 shows the structure of a possible example of the charging device shown in FIG. 4 . As shown in FIG. 7 , the number of power conversion modules is eight, and the number of output devices is six. Wherein, the number of at least one first power conversion module is a=3, the number of at least one second power conversion module is b=3, the number of at least one third power conversion module is o=1, and the number of at least one fourth power conversion module is The number of modules is p=1.

With the charging device shown in FIG. 6 , a plurality of switches between the bus bars constitute a switch matrix of (a+o)*b+p*a. In the charging device shown in Figure 2, when the number of output devices is M and the number of power conversion modules is N, the dimension of the switch matrix is M*N, where M=a+b, N=a+b +o+p. Therefore, compared with the switch matrix in the charging device shown in FIG. 2 , the dimension of the switch matrix in the charging device provided by the embodiment of the present application is lower, and the number of switches is less.

Moreover, in the charging device shown in FIG. 6, when the number of power conversion modules is greater than the number of output devices, each fourth power conversion module can be connected in parallel with each first power conversion module through a switch, so that it can be connected with the fourth power conversion module. An output device connected to a power conversion module provides electrical energy. Each third power conversion module can be connected in parallel with each second power conversion module through a switch, so as to provide electric energy for an output device connected to the second power conversion module. In this way, the charging device can flexibly provide power to any output device through fewer switches, thereby reducing the number of switches, thereby reducing the volume of the charging device and reducing the cost of the charging device.

In addition, in the charging device shown in FIG. 6 , part of the power conversion modules and the output device are connected through a bus, in other words, the charging device multiplexes the bus of the power conversion module and the bus of the output device. In the charging device shown in FIG. 2 , the power conversion module and the output device are respectively connected to a bus. Therefore, compared with the charging device shown in FIG. 2 , the charging device shown in FIG. 6 can effectively reduce the number of bus bars, thereby reducing the cost of the charging device.

The embodiment of the present application also provides a charging system. FIG. 8 shows a possible architecture of the charging system. As shown in FIG. 8 , the charging system includes: a transformer and any of the above-mentioned charging devices; wherein, both ends of the transformer can be respectively connected to a power source and the charging device.

Wherein, the transformer can perform voltage conversion on the electric energy provided by the power supply, and output the converted electric energy to each power conversion module in the charging device. For example, the power supply can provide electric energy with a voltage of 10 kilovolts (kV), and the transformer converts the electric energy of 10 kV into electric energy with a voltage of 380V, and outputs the electric energy of 380V to each power conversion module in the charging device.

In the charging system, each first power conversion module can be connected to a first output device through a first bus bar and a switch; each second power conversion module can be connected to a first output device through a second bus bar and a switch. The two output devices are connected in one-to-one correspondence; each first bus is connected to each second bus through a switch. 3 and 6, compared with the switch matrix in the charging device shown in FIG. The conversion module can provide power to any output device under the control of the switch. Therefore, the charging system can flexibly provide power to any output device through fewer switches, thereby reducing the number of switches, thereby reducing the volume of the charging system and reducing the cost of the charging system.

In addition, in the charging system, part or all of the power conversion modules and the output device are connected through a bus bar. In other words, the charging system multiplexes the power conversion module bus and the output device bus. In the charging device shown in FIG. 2 , the power conversion module and the output device are respectively connected to a bus. Therefore, compared with the charging device shown in FIG. 2 , the charging system can effectively reduce the number of bus bars, thereby reducing the cost of the charging system.

Apparently, those skilled in the art can make various changes and modifications to this application without departing from the protection scope of this application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

A charging device, characterized by comprising: at least one first power conversion module, at least one first output device, at least one second power conversion module, and at least one second output device; wherein,

Each first power conversion module is connected to a first output device in a one-to-one correspondence through a first bus bar and a switch;

Each second power conversion module is connected to a second output device in one-to-one correspondence through a second bus bar and a switch;

Each first bus is respectively connected to each second bus through a switch.
The device according to claim 1, further comprising: at least one third power conversion module and/or at least one fourth power conversion module; wherein,

Each third power conversion module is connected to a third busbar; each third busbar is connected to each second busbar through a switch;

Each fourth power conversion module is connected to a fourth busbar; each fourth busbar is connected to each first busbar through a switch.
The device according to claim 2, characterized in that,

The sum of the number of the at least one first power conversion module, the number of the at least one second power conversion module, the number of the at least one third power conversion module and the number of the at least one fourth power conversion module is 8;

The sum of the number of the at least one first output device and the number of the at least one second output device is six.
A device according to claim 1 or 2, characterized in that

The number of the at least one first power conversion module and the number of the at least one first output device are both M/2;

The number of the at least one second power conversion module and the number of the at least one second output device are both M/2;

Wherein, M is a positive integer, and M is an even number.
The device according to claim 4, wherein said M is 8.
A device according to claim 1 or 2, characterized in that

The number of the at least one first power conversion module and the number of the at least one first output device are both (M+1)/2;

The number of the at least one second power conversion module and the number of the at least one second output device are both (M-1)/2;

Wherein, M is a positive integer, and M is an odd number.
The device according to any one of claims 1 to 6, wherein any one of the at least one first output device and/or the at least one second output device is one of the following:

Charging guns, charging piles and charging stacks.
A charging system, characterized by comprising: a transformer and the charging device according to any one of claims 1 to 7, wherein,

Two ends of the transformer are respectively connected to the power supply and the charging device.