Charging apparatus, charging method and charging system

Abstract

Disclosed in the embodiments of the present disclosure are a charging apparatus, a charging method and a charging system. The charging apparatus comprises three charging modules, wherein a first charging module receives a first voltage from an alternating current power grid, converts the first voltage into a first output voltage, and provides same to a first device to be charged for charging; a second charging module receives a second voltage from the alternating current power grid, converts the second voltage into a second output voltage, and provides same to a second device to be charged for charging; a third charging module receives a third voltage from the alternating current power grid, converts the third voltage into a third output voltage, and provides same to a third device to be charged for charging; the first voltage, the second voltage and the third voltage have the same frequency and amplitude, and have a phase difference of 120 degrees between each other; and the three charging modules are configured to control the three voltages from the alternating current power grid to charge said first device, said second device and said third device simultaneously.

Description

Charging device, charging method and charging system

[0001] Cross-reference to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202410912856.X, filed on July 9, 2024, entitled “Charging Device, Charging Method and Charging System”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of power grid charging technology, and in particular to a charging device, charging method and charging system. Background Technology

[0004] As cities impose increasingly stringent environmental requirements on automobiles, the usage rate of pure electric vehicles is rising in China, making convenient and safe energy replenishment for these vehicles particularly important. Currently, existing electric vehicle charging stations typically consist of several charging piles, but each pile can only connect to one charging gun at a time, allowing only one electric vehicle to be charged simultaneously. To enable simultaneous charging of multiple electric vehicles, multiple charging piles are needed, increasing costs. Conversely, to reduce costs, the limited number of charging piles may lead to queuing, reducing charging efficiency. Summary of the Invention

[0005] This disclosure provides a charging device, charging method, and charging system that can reduce costs while improving charging efficiency.

[0006] The technical solution disclosed herein is implemented as follows:

[0007] In a first aspect, embodiments of this disclosure provide a charging device comprising three charging modules, namely a first charging module, a second charging module, and a third charging module, wherein:

[0008] The first charging module is used to receive the first voltage from the AC power grid, convert the first voltage into a first output voltage, and provide it to the first device to be charged for charging.

[0009] The second charging module is used to receive the second voltage from the AC power grid, convert the second voltage into a second output voltage, and provide it to the second device to be charged for charging.

[0010] The third charging module is used to receive the third voltage from the AC power grid, convert the third voltage into a third output voltage, and provide it to the third device to be charged for charging.

[0011] The first charging module, the second charging module, and the third charging module have a one-to-one correspondence with the first, second, and third devices to be charged; the first, second, and third voltage channels have the same frequency and amplitude, and their phases differ by 120 degrees; and the three charging modules are used to control the three voltage channels of the AC power grid to charge the first, second, and third devices to be charged simultaneously.

[0012] Through the aforementioned technical means, the charging device includes three charging modules, which can control three voltages from the AC power grid to simultaneously charge three devices (e.g., electric vehicles). Specifically, the first charging module receives the first voltage from the AC power grid, the second charging module receives the second voltage, and the third charging module receives the third voltage. The first, second, and third voltages have the same frequency and amplitude, and are 120 degrees out of phase. Thus, the charging device can simultaneously charge three vehicles, avoiding queuing and improving charging efficiency. Furthermore, the separate connection of the three charging modules to the three voltages of the AC power grid, with a 120-degree phase difference, simplifies the circuit structure and reduces costs. Simultaneous charging of three vehicles also ensures three-phase balance in the AC power grid, preventing damage to components and improving charging safety.

[0013] In some embodiments, the first input terminal of the first charging module is connected to the first phase line of the AC power grid; the first input terminal of the second charging module is connected to the second phase line of the AC power grid; the first input terminal of the third charging module is connected to the third phase line of the AC power grid; and the second input terminal of the first charging module is connected to the second input terminals of the second charging module and the third charging module, respectively.

[0014] Through the above-mentioned technical means, the first charging module, the second charging module and the third charging module are connected to the AC power grid in a star configuration. This connection method is simple, and the three voltages received have the same frequency and amplitude, and their phases differ by 120 degrees. This allows the AC power grid to charge the three devices simultaneously and ensures the three-phase balance of the AC power grid during the charging process, thereby improving the charging efficiency.

[0015] In some embodiments, the first input terminal of the first charging module is connected to the first phase line of the AC power grid, and the second input terminal of the first charging module is connected to the third phase line of the AC power grid; the first input terminal of the second charging module is connected to the second phase line of the AC power grid, and the second input terminal of the second charging module is connected to the first phase line of the AC power grid; the first input terminal of the third charging module is connected to the third phase line of the AC power grid, and the second input terminal of the third charging module is connected to the second phase line of the AC power grid.

[0016] Through the aforementioned technical means, the first, second, and third charging modules are connected to the AC power grid in a delta configuration. This configuration allows the AC power grid to charge the three devices simultaneously while maintaining the three-phase balance of the AC power grid during charging. Furthermore, the three voltages in the delta configuration are higher than those in the star configuration, providing higher charging power and further improving charging efficiency.

[0017] In some embodiments, the first charging module, the second charging module, and the third charging module have the same circuit structure; the first charging module includes a first power unit, a first switching unit, and a first charging interface, the first switching unit is connected between the first power unit and the first charging interface, and the first charging interface is used to connect a first device to be charged.

[0018] Through the above-mentioned technical means, since the first switch unit is connected between the first power unit and the first charging interface, the opening and closing of the first switch unit can control the connection and disconnection of the path between the first power unit and the first charging interface. Thus, before the first charging interface is connected to the first device to be charged, the first switch unit is in the open state, thereby avoiding electric shock when the user manually connects the first device to be charged, and reducing the harm to personal safety.

[0019] In some embodiments, the first switching unit includes a first switch and / or a second switch, wherein: the first switch is connected between the positive terminal of the first power unit and the positive terminal of the first charging interface; and the second switch is connected between the negative terminal of the first power unit and the negative terminal of the first charging interface.

[0020] By using the above-mentioned technical means, the opening and closing of the first switch and / or the second switch can control the connection and disconnection of the path between the first power unit and the first charging interface. Thus, before the first charging interface is connected to the first device to be charged, both the first switch and the second switch are in the open state, thereby avoiding electric shock when the user manually connects the first device to be charged and reducing the harm to personal safety.

[0021] In some embodiments, the first charging module further includes a first pre-charging unit, wherein: the first pre-charging unit is connected in parallel across the two ends of the first switch; or, the first pre-charging unit is connected in parallel across the two ends of the second switch.

[0022] Using the aforementioned technical means, the first pre-charging unit can be connected in parallel across the two ends of the first switch, or it can be connected in parallel across the two ends of the second switch. During the initial power-on phase, the first pre-charging unit operates, pre-charging with a smaller current to avoid damage to some components from high-voltage surges, thereby improving the reliability of vehicle charging.

[0023] In some embodiments, the first pre-charging unit includes a third switch and a first resistor, wherein the third switch and the first resistor are connected in series, and the first pre-charging unit is used to control the first charging module to enter the pre-charging mode when the third switch is in the closed state; and / or to control the first charging module to close the pre-charging mode when the third switch is in the open state.

[0024] Through the above-mentioned technical means, the third switch is connected in series with the first resistor. The first resistor here has a large resistance value as a pre-charging resistor. When the third switch is closed, the presence of the first resistor can reduce the charging current at the beginning of power-on. At this time, pre-charging is carried out with a smaller current to avoid damage to some components caused by high voltage impact, thereby improving the reliability of vehicle charging.

[0025] In some embodiments, the first charging module further includes a first protection device, wherein the first protection device is connected between the first power unit and the first charging interface, and is used to control the path between the first power unit and the first charging interface to be disconnected when the first charging module fails.

[0026] Through the above-mentioned technical means, if the first charging module fails during the charging process of the first device to be charged, the first protection device can control the path between the first power unit and the first charging interface to be disconnected, thereby improving the reliability of the first charging module.

[0027] In some embodiments, the first protection device includes a first fuse and / or a second fuse, wherein: the first fuse is connected between the positive terminal of the first power unit and the positive terminal of the first charging interface; and the second fuse is connected between the negative terminal of the first power unit and the negative terminal of the first charging interface.

[0028] Using the aforementioned technical means, a first fuse is typically installed between the positive terminal of the first power unit and the positive terminal of the first charging interface, and a second fuse is installed between the negative terminal of the first power unit and the negative terminal of the first charging interface. If the first charging module malfunctions, the first fuse and / or the second fuse may trip due to excessive current. In the event of a malfunction, disconnecting the first fuse and / or the second fuse can cut off the path between the first power unit and the first charging interface, thereby providing protection and improving the reliability of the first charging module.

[0029] In some embodiments, the first power unit includes an H-bridge circuit composed of four power devices.

[0030] Through the above-mentioned technical means, the first power unit is an H-bridge circuit composed of four power devices, which makes the circuit structure of the first charging module simple and low in cost. Moreover, when all three charging modules use H-bridge circuits, not only can multiple connection methods on the AC side be realized (such as star connection and delta connection), but also the AC grid can charge the three devices to be charged at the same time, and the three devices to be charged can feed back electrical energy to the AC grid together, realizing the vehicle-to-grid (V2G) function.

[0031] Secondly, embodiments of this disclosure provide a charging method applied to a charging device, the charging device including three charging modules, and the three charging modules including a first charging module, a second charging module, and a third charging module; the charging method includes:

[0032] The first charging module receives a first voltage from the AC power grid, converts it into a first output voltage, and provides it to the first device to be charged for charging. The second charging module receives a second voltage from the AC power grid, converts it into a second output voltage, and provides it to the second device to be charged for charging. The third charging module receives a third voltage from the AC power grid, converts it into a third output voltage, and provides it to the third device to be charged for charging. The first, second, and third charging modules correspond one-to-one with the first, second, and third devices to be charged. The first, second, and third voltages have the same frequency and amplitude, and their phases differ by 120 degrees.

[0033] Using the aforementioned technical means, three voltage lines from the AC power grid are utilized, with each voltage output connected to a charging module. Each charging module then charges the corresponding connected device. Specifically, the first charging module receives the first voltage line from the AC power grid, the second receiving the second, and the third receiving the third. These three modules allow for simultaneous charging of three devices (e.g., electric vehicles) using the three voltage lines, avoiding queuing and improving charging efficiency. Furthermore, the separate 120-degree phase difference between the three voltage lines simplifies the charging device's circuit structure and reduces costs. Simultaneous charging of three vehicles ensures three-phase balance in the AC power grid, preventing damage to components and improving charging safety.

[0034] In some embodiments, the first charging module includes a first switching unit and a first pre-charging unit. The first switching unit includes a first switch and a second switch, and the first pre-charging unit includes a third switch and a first resistor. When the first pre-charging unit is connected in parallel across the first switch, the charging method further includes: when it is detected that the charging device is simultaneously connected to three devices to be charged, closing the second switch and the third switch to enable the first charging module to enter the pre-charging mode; and when it is detected that the charging voltages of the three devices to be charged all meet preset conditions, closing the first switch and opening the third switch to enable the first charging module to close the pre-charging mode.

[0035] Using the aforementioned technical means, when three devices to be charged are simultaneously connected to the charging device, taking the first charging module as an example, closing the second and third switches indicates that the pre-charging unit in the first charging module has started working, that is, the first charging module has entered the pre-charging mode; when the charging voltage of the three devices to be charged meets the preset conditions, closing the first switch and opening the third switch, that is, the first charging module closes the pre-charging mode; thus, in the pre-charging mode, high-voltage impacts can be avoided from damaging some components, improving the reliability of vehicle charging, and the charging speed of the devices to be charged can be increased after the pre-charging mode is closed.

[0036] In some embodiments, when the first pre-charging unit is connected in parallel across the two ends of the second switch, the charging method further includes: when it is detected that the charging device is simultaneously connected to three devices to be charged, closing the first switch and the third switch to enable the first charging module to enter the pre-charging mode; and when it is detected that the charging voltages of the three devices to be charged all meet the preset conditions, closing the second switch and opening the third switch to enable the first charging module to close the pre-charging mode.

[0037] Using the above-mentioned technical means, when three devices to be charged are simultaneously connected to the charging device, taking the first charging module as an example, closing the first switch and the third switch indicates that the pre-charging unit in the first charging module starts working, that is, the first charging module enters the pre-charging mode; when the charging voltage of the three devices to be charged meets the preset conditions, closing the second switch and opening the third switch means that the first charging module closes the pre-charging mode; thus, in the pre-charging mode, high voltage impact can be avoided from damaging some components, improving the reliability of vehicle charging, and the charging speed of the devices to be charged can also be increased after the pre-charging mode is closed.

[0038] In some embodiments, the charging method further includes: when all three charging modules are in pre-charging mode, controlling the three voltages of the AC power grid through the power units in the three charging modules to simultaneously pre-charge the first device to be charged, the second device to be charged, and the third device to be charged; and when all three charging modules are in pre-charging mode, controlling the three voltages of the AC power grid through the power units in the three charging modules to continue simultaneously charging the first device to be charged, the second device to be charged, and the third device to be charged.

[0039] Through the aforementioned technical means, when all three charging modules enter pre-charging mode, the pre-charging modules in the three charging modules operate, and the power units in the three charging modules can control the AC power grid to pre-charge the three devices to be charged, i.e., to charge slowly with a smaller current. When all three charging modules close the pre-charging mode, the pre-charging units in the three charging modules stop operating, and the power units in the three charging modules can control the AC power grid to charge the three devices to be charged, at which point charging is performed quickly with a larger current. This not only avoids damage to some components caused by high-voltage surges and improves the reliability of vehicle charging, but also increases the charging speed of the three devices to be charged.

[0040] In some embodiments, the first charging module includes a first power unit, and the first power unit includes a first power device, a second power device, a third power device, and a fourth power device. The first charging module receives a first voltage from the AC power grid, converts the first voltage into a first output voltage, and provides it to a first device to be charged for charging. This includes: during the positive half-cycle of the first voltage, controlling the first power device and the third power device to be in a conducting state, and the second power device and the fourth power device to be in a turning state, the first power unit performs voltage conversion on the first voltage and provides the obtained first output voltage to the first device to be charged for charging; during the negative half-cycle of the first voltage, controlling the first power device and the third power device to be in a turning state, and the second power device and the fourth power device to be in a conducting state, the first power unit performs voltage conversion on the first voltage and provides the obtained first output voltage to the first device to be charged for charging.

[0041] Using the aforementioned technical means, four power devices can be used to switch the voltage polarity applied to the first device to be charged. Specifically, during the positive half-cycle, the first and third power devices are controlled to be in the on state, while the second and fourth power devices are in the off state. The first power unit converts the first voltage into the first output voltage to provide charging for the first device to be charged. During the negative half-cycle, the first and third power devices are controlled to be in the off state, while the second and fourth power devices are in the on state. The first power unit converts the first voltage into the first output voltage to provide charging for the first device to be charged, thereby realizing the DC output of the first charging module. Similarly, the DC output of the second and third charging modules can also be realized, thereby enabling the AC grid to charge the three devices to be charged simultaneously, improving charging efficiency.

[0042] Thirdly, embodiments of this disclosure provide a charging system, which includes three devices to be charged and a charging device as described in the first aspect. The three devices to be charged include a first device to be charged, a second device to be charged, and a third device to be charged, wherein:

[0043] The first charging module is connected to the first device to be charged and is used to control the first voltage of the AC power grid to charge the first device to be charged; the second charging module is connected to the second device to be charged and is used to control the second voltage of the AC power grid to charge the second device to be charged; the third charging module is connected to the third device to be charged and is used to control the third voltage of the AC power grid to charge the third device to be charged.

[0044] Through the aforementioned technical means, this charging system enables simultaneous charging of three devices, avoiding queuing for electric vehicles and improving charging efficiency. Furthermore, the three charging modules are connected to three separate voltage lines of the AC power grid, with a 120-degree phase difference between them. This simplifies the circuit structure of the charging device and reduces the construction cost of charging stations compared to scenarios involving simultaneous charging of multiple vehicles in related technologies. Simultaneous charging of three vehicles also ensures the three-phase balance of the AC power grid, preventing damage to components and improving vehicle charging safety.

[0045] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and are not intended to limit the technical solutions of this disclosure. Attached Figure Description

[0046] Figure 1 is a schematic diagram of the composition structure of a charging device provided in an embodiment of this disclosure;

[0047] Figure 2 is a schematic diagram of the composition structure of a charging device provided in an embodiment of this disclosure;

[0048] Figure 3 is a schematic diagram of the composition structure of a charging device provided in an embodiment of this disclosure;

[0049] Figure 4 is a schematic diagram of the composition structure of a first charging module provided in an embodiment of this disclosure;

[0050] Figure 5 is a schematic diagram of the composition structure of a first charging module provided in an embodiment of this disclosure;

[0051] Figure 6 is a schematic diagram of the composition structure of a first charging module provided in an embodiment of this disclosure;

[0052] Figure 7 is a schematic diagram of the composition structure of a charging device provided in an embodiment of this disclosure;

[0053] Figure 8 is a schematic flowchart of a charging method provided in an embodiment of this disclosure;

[0054] Figure 9 is a schematic flowchart of a charging method provided in an embodiment of this disclosure;

[0055] Figure 10 is a schematic diagram of the composition structure of a charging system provided in an embodiment of this disclosure;

[0056] Figure 11 is a detailed structural schematic diagram of a charging system provided in an embodiment of this disclosure;

[0057] Figure 12 is a detailed structural schematic diagram of a charging system provided in an embodiment of this disclosure. Detailed Implementation

[0058] In order to gain a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of this disclosure.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing embodiments of this disclosure only and is not intended to be limiting of this disclosure.

[0060] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0061] It should also be noted that the terms "first, second, third" used in the embodiments of this disclosure are only used to distinguish similar objects and do not represent a specific order of objects. It is understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this disclosure described herein can be implemented in an order other than that illustrated or described herein.

[0062] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0063] The following is a description of the relevant technologies disclosed herein.

[0064] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are being used more and more in the field of energy storage.

[0065] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0066] In this embodiment, the battery can be a single battery cell. A single battery cell refers to a basic unit capable of converting chemical energy into electrical energy, and can be used to manufacture battery modules or battery packs to supply power to electrical devices. A single battery cell can be a rechargeable battery, which is a battery cell that can be recharged after discharge to reactivate its active materials and continue to be used. The single battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this embodiment is not limited to these types.

[0067] In embodiments of this disclosure, the battery may also be a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or mixed via a busbar.

[0068] Electric vehicles (especially electric cars) are vehicles powered by an onboard power source, using an electric motor to drive the wheels, and meeting all road traffic and safety regulations. Due to their relatively smaller environmental impact compared to traditional cars, their prospects are widely viewed as promising; however, the technology is currently not yet mature. Among the key factors restricting the development of electric vehicles are battery performance and charging technology.

[0069] In current electric vehicle charging stations, due to equipment deficiencies, when the number of electric vehicles exceeds the number of charging stations, especially as the number of electric vehicles increases, it can cause congestion on highways, particularly at highway service areas, due to slow charging speeds. To solve this problem, multiple charging stations would be needed, increasing construction costs and overall expenses. To save on construction costs, charging stations typically have a limited number of charging stations, which can lead to queuing and reduced charging efficiency.

[0070] Based on this, the present disclosure provides a charging device, a charging method, and a charging system. The charging device includes three charging modules, which can control three voltages from the AC power grid to simultaneously charge three devices. Specifically, the first charging module receives the first voltage from the AC power grid, the second charging module receives the second voltage from the AC power grid, and the third charging module receives the third voltage from the AC power grid. The first, second, and third voltages have the same frequency and amplitude, and are 120 degrees out of phase. Thus, the charging device can simultaneously charge three devices, avoiding queuing for electric vehicles and improving charging efficiency. Furthermore, the three charging modules are connected to the three voltages of the AC power grid respectively, and the 120-degree phase difference between these three voltages simplifies the circuit structure of the charging device. Compared to scenarios where multiple vehicles are charged simultaneously in related technologies, this also reduces the construction cost of charging stations and lowers overall costs. Simultaneously, charging three vehicles simultaneously ensures the three-phase balance of the AC power grid, preventing damage to components and improving the safety of vehicle charging.

[0071] The present disclosure will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0072] In one embodiment of this disclosure, FIG1 is a schematic diagram of the composition structure of a charging device provided in this embodiment. As shown in FIG1, the charging device 10 may include three charging modules, namely a first charging module 101, a second charging module 102, and a third charging module 103, wherein:

[0073] The first charging module 101 is used to receive the first voltage from the AC power grid 201, convert the first voltage into a first output voltage and provide it to the first device to be charged 202-1 for charging.

[0074] The second charging module 102 is used to receive the second voltage from the AC power grid 201, convert the second voltage into a second output voltage and provide it to the second device to be charged 202-2 for charging.

[0075] The third charging module 103 is used to receive the third voltage from the AC power grid 201, convert the third voltage into a third output voltage, and provide it to the third device to be charged 202-3 for charging.

[0076] In this embodiment, the first charging module 101, the second charging module 102, and the third charging module 103 have a one-to-one correspondence with the first device to be charged 202-1, the second device to be charged 202-2, and the third device to be charged 202-3. Specifically, the first charging module 101 is connected to the first device to be charged 202-1, the second charging module 102 is connected to the second device to be charged 202-2, and the third charging module 103 is connected to the third device to be charged 202-3. Furthermore, the first, second, and third voltage channels have the same frequency and amplitude, and their phases differ by 120 degrees. The three charging modules control the three voltage channels of the AC power grid 201 to simultaneously charge the first device to be charged 202-1, the second device to be charged 202-2, and the third device to be charged 202-3.

[0077] In this embodiment, the charging device 10 can be a charging pile, similar in function to a gas pump at a gas station. It can be fixed to the ground or wall and installed in parking lots or charging stations in public buildings and residential areas. It can also charge various types of devices according to different voltage levels. Exemplarily, the input end of the charging pile is directly connected to the AC power grid, and the output end can be connected to multiple devices to be charged (e.g., the first device to be charged 202-1, the second device to be charged 202-2, and the third device to be charged 202-3) for charging these devices. The devices to be charged can be new energy electric vehicles or other electrical equipment.

[0078] In this embodiment of the disclosure, the AC power grid 201 can be a three-phase AC power supply. Specifically, the three-phase AC power supply consists of three AC power supplies with the same frequency, equal amplitude, and a phase difference of 120°, which can usually be represented by phase A, phase B, and phase C. Among them, the voltage of each phase A, phase B, and phase C can be called the phase voltage, and the voltage between any two phases is called the line voltage.

[0079] In this embodiment of the disclosure, the three voltages of the AC power grid 201 can refer to the phase voltages of phases A, B, and C, or they can refer to the line voltages between phases A, B, and C. Here, whether it is three phase voltages or three line voltages, they can be regarded as being composed of three AC currents with the same frequency and amplitude, and a phase difference of 120 degrees.

[0080] In this embodiment, three voltages from the AC power grid 201 are utilized, with each voltage output connected to a charging module. Each charging module then charges the corresponding connected device. Since the three voltages are 120 degrees out of phase, the three charging modules can control the three voltages of the AC power grid to simultaneously charge three devices. Specifically, the first charging module 101 receives the first voltage from the AC power grid 201, the second charging module 102 receives the second voltage, and the third charging module 103 receives the third voltage. This allows the charging device 10 to simultaneously charge three devices, avoiding queuing for electric vehicles and improving charging efficiency. Furthermore, the 120-degree phase difference between the three voltages simplifies the circuit structure of the charging device and reduces costs. Simultaneous charging of three vehicles also ensures the three-phase balance of the AC power grid, preventing damage to components and improving charging safety.

[0081] In this embodiment of the disclosure, the three-phase balance of the AC power grid 201 can mean that the voltages of the three phases must be sinusoidal waves with the same frequency and amplitude, and a phase difference of 120 degrees; and that the currents of the three phases must also be sinusoidal waves with the same frequency and amplitude, and a phase difference of 120 degrees. In practical applications, absolute three-phase balance does not exist. Generally, three-phase balance refers to the voltage parameters of the three phases meeting a preset range, and the current parameters of the three phases meeting a preset range. In this case, three-phase balance can be considered satisfied.

[0082] In this embodiment, considering the three-phase balance of the AC power grid 201, the three charging modules have the same charging power and are used to control the AC power grid 201 to charge the three devices simultaneously. That is, when there are many vehicles waiting to be charged, the charging device 10 of this embodiment can charge three electric vehicles simultaneously, saving waiting time and improving charging efficiency. Furthermore, it should be noted that the charging power of each of the three electric vehicles remains consistent when charging simultaneously, thereby ensuring three-phase balance. This avoids the shortened lifespan of the downstream devices, accelerated component replacement frequency, and even component burnout caused by three-phase imbalance, as well as increased line losses due to three-phase imbalance.

[0083] In some embodiments, based on the charging device 10 shown in FIG1 and referring to FIG2, the connection relationship between the AC power grid 201 and the three charging modules may include: the first input terminal of the first charging module 101 is connected to the first phase line of the AC power grid 201; the first input terminal of the second charging module 102 is connected to the second phase line of the AC power grid 201; the first input terminal of the third charging module 103 is connected to the third phase line of the AC power grid 201; and the second input terminal of the first charging module 101 is connected to the second input terminal of the second charging module 102 and the second input terminal of the third charging module 103, respectively.

[0084] In this embodiment of the present disclosure, the connection method shown in Figure 2 can be called a star connection method. In this case, the first voltage of the AC power grid 201 is the phase voltage of phase A (denoted by Ua), the second voltage of the AC power grid 201 is the phase voltage of phase B (denoted by Ub), and the third voltage of the AC power grid 201 is the phase voltage of phase C (denoted by Uc).

[0085] In this embodiment of the disclosure, the first charging module 101, the second charging module 102, and the third charging module 103 are connected to the AC power grid in a star configuration. This connection method is simple, and the frequency and amplitude of the three received voltages (i.e., the three phase voltages) are the same, with a phase difference of 120 degrees. This allows the AC power grid 201 to charge the three devices simultaneously, and ensures the three-phase balance of the AC power grid during the charging process, thereby improving the charging efficiency.

[0086] In some embodiments, based on the charging device 10 shown in FIG1 and referring to FIG3, the connection relationship between the AC power grid 201 and the three charging modules may include: the first input terminal of the first charging module 101 is connected to the first phase line of the AC power grid 201, and the second input terminal of the first charging module 101 is connected to the third phase line of the AC power grid 201; the first input terminal of the second charging module 102 is connected to the second phase line of the AC power grid 201, and the second input terminal of the second charging module 102 is connected to the first phase line of the AC power grid 201; the first input terminal of the third charging module 103 is connected to the third phase line of the AC power grid 201, and the second input terminal of the third charging module 103 is connected to the second phase line of the AC power grid 201.

[0087] In this embodiment of the disclosure, the connection method shown in Figure 3 can be called a delta connection (or "Δ connection"). In this case, the first voltage of the AC power grid 201 is the line voltage between phase A and phase C (represented by Uac), the second voltage of the AC power grid 201 is the line voltage between phase B and phase A (represented by Uba), and the third voltage of the AC power grid 201 is the line voltage between phase C and phase B (represented by Ucb).

[0088] In this embodiment, phase voltage refers to the voltage between any phase line (e.g., phase A, phase B, or phase C) and the neutral line. Three-phase alternating current has three phase voltages, all with the same amplitude, frequency, and a phase difference of 120 degrees. In this embodiment, the voltage between any two phase lines is called line voltage. Three-phase alternating current also has three line voltages, all with the same amplitude, frequency, and a phase difference of 120 degrees.

[0089] The relationship between line voltage and phase voltage is as follows: line voltage equals The line voltage is 380V, which is twice the phase voltage. For example, if the phase voltage is 220V, then the line voltage is 380V.

[0090] In other words, in this embodiment of the present disclosure, the first charging module 101, the second charging module 102, and the third charging module 103 are connected to the AC power grid in a delta configuration. Under this configuration, the three voltages (i.e., the three line voltages) received by the three charging modules have the same frequency and amplitude, and the phase difference between them is also 120 degrees. This enables the AC power grid 201 to charge the three devices simultaneously and ensures the three-phase balance of the AC power grid during the charging process. In addition, the three voltages under the delta configuration are higher than those under the star configuration. Compared with the star configuration, the delta configuration can provide higher charging power and further improve charging efficiency.

[0091] In some embodiments, the first charging module 101, the second charging module 102, and the third charging module 103 have the same circuit structure, and considering the three-phase balance of the AC power grid, the three charging modules have the same charging power to enable simultaneous charging of three devices to be charged.

[0092] In this embodiment, the three charging modules have the same circuit structure. The internal circuit structure of the first charging module 101 will be described below as an example.

[0093] In some embodiments, referring to FIG4, the first charging module 101 may include a first power unit 1011, a first switch unit 1012 and a first charging interface 1013. The first switch unit 1012 is connected between the first power unit 1011 and the first charging interface 1013, and the first charging interface 1013 is used to connect the first device to be charged 202-1.

[0094] In this embodiment of the disclosure, the first switch unit 1012 is connected between the first power unit 1011 and the first charging interface 1013, and can be used to control the on / off state of the path between the first power unit 1011 and the first charging interface 1013.

[0095] For example, before the first charging interface 1013 is connected to the first device to be charged 202-1, the first switching unit 1012 is in the off state, which disconnects the path between the first power unit 1011 and the first charging interface 1013, thereby preventing the user from being electrocuted when manually connecting the first device to be charged 202-1, thus reducing the harm to personal safety.

[0096] Thus, in this embodiment of the present disclosure, since the first switch unit 1012 is connected between the first power unit 1011 and the first charging interface 1013, the opening and closing of the first switch unit 1012 can control the connection and disconnection of the path between the first power unit 1011 and the first charging interface 1013. In this way, before the first charging interface 1013 is connected to the first device to be charged 202-1, the first switch unit 1012 is in the open state, thereby avoiding electric shock when the user manually connects the first device to be charged, and reducing the harm to personal safety.

[0097] In some embodiments, continuing to refer to FIG4, the first switching unit 1012 may include a first switch K1 and / or a second switch K2, wherein:

[0098] The first switch K1 is connected between the positive terminal of the first power unit 1011 and the positive terminal of the first charging interface 1013;

[0099] The second switch K2 is connected between the negative terminal of the first power unit 1011 and the negative terminal of the first charging interface 1013.

[0100] In this embodiment of the disclosure, as shown in FIG4, the first switch K1 is connected between the positive terminal of the first power unit 1011 and the positive terminal of the first charging interface 1013, so the first switch K1 can also be called the "positive side switch"; the second switch K2 is connected between the negative terminal of the first power unit 1011 and the negative terminal of the first charging interface 1013, so the second switch K2 can also be called the "negative side switch".

[0101] In this embodiment of the disclosure, as shown in FIG4, when the first switch unit 1012 includes a first switch K1 and a second switch K2, the first switch K1 and the second switch K2 can be configured to work independently. For example, the state of the first switch K1 is closed and the state of the second switch K2 is open; or, the state of the first switch K1 is open and the state of the second switch K2 is closed; or, the state of the first switch K1 is open and the state of the second switch K2 is open, etc., without specific limitations.

[0102] In this embodiment, since the first switch K1 is connected between the positive terminal of the first power unit 1011 and the positive terminal of the first charging interface 1013, and the second switch K2 is connected between the negative terminal of the first power unit 1011 and the negative terminal of the first charging interface 1013, the opening and closing of the first switch K1 and / or the second switch K2 can control the connection and disconnection of the path between the first power unit 1011 and the first charging interface 1013. Thus, before the first charging device 202-1 is connected to the first charging interface 1013, both the first switch K1 and the second switch K2 are in the open state, thereby avoiding electric shock when the user manually connects the first charging device and reducing the harm to personal safety.

[0103] In some embodiments, continuing to refer to FIG4, the first charging module 101 may further include a first protection device 1014, wherein:

[0104] The first protection device 1014 is connected between the first power unit 1011 and the first charging interface 1013, and is used to control the path between the first power unit 1011 and the first charging interface 1013 to be disconnected when the first charging module 101 fails.

[0105] In this embodiment, the first protection device 1014 can be a fuse, circuit breaker, or the like. Thus, during the charging process of the first device to be charged 202-1, if the first charging module 101 malfunctions, the first protection device 1014 can control the path between the first power unit 1011 and the first charging interface 1013 to be disconnected, thereby improving the reliability of the first charging module.

[0106] In some embodiments, taking a fuse as an example, continuing to refer to FIG4, the first protection device 1014 may include a first fuse F1 and / or a second fuse F2, wherein:

[0107] The first fuse F1 is connected between the positive terminal of the first power unit 1011 and the positive terminal of the first charging interface 1013;

[0108] The second fuse F2 is connected between the negative terminal of the first power unit 1011 and the negative terminal of the first charging interface 1013.

[0109] In this embodiment of the present disclosure, as shown in FIG4, the first fuse F1 is connected between the positive terminal of the first power unit 1011 and the positive terminal of the first charging interface 1013, so the first fuse F1 can also be called the "positive side fuse"; the second fuse F1 is connected between the negative terminal of the first power unit 1011 and the negative terminal of the first charging interface 1013, so the second fuse F1 can also be called the "negative side fuse".

[0110] In this embodiment of the present disclosure, in order to improve reliability, a first fuse F1 is typically provided between the positive terminal of the first power unit 1011 and the positive terminal of the first charging interface 1013, and a second fuse F2 is provided between the negative terminal of the first power unit 1011 and the negative terminal of the first charging interface 1013. If the first charging module 101 fails, the first fuse F1 and / or the second fuse F2 will be disconnected due to excessive current. In the event of a failure, disconnecting the first fuse F1 and / or the second fuse F2 will cut off the path between the first power unit 1011 and the first charging interface 1013, thereby providing protection and improving the reliability of the first charging module.

[0111] In some embodiments, based on the charging device 10 shown in FIG4, and referring to FIG5 or FIG6, the first charging module 101 may further include a first pre-charging unit 1015. The first pre-charging unit 1015 is used to control whether the first charging module 101 enters a pre-charging mode.

[0112] In this embodiment of the disclosure, pre-charging is a charging process that provides a small current to the battery before the formal charging process begins. The main purpose of this process is to optimize battery performance, extend battery life, protect the battery, and improve charging efficiency. Pre-charging is particularly important in the early stages of the battery's lifespan, especially during the first charge, because it helps the battery reach its optimal state of charge.

[0113] In addition, pre-charging is an essential high-voltage safety feature in new energy electric vehicles. Its function is to charge with a smaller current during the initial power-on phase, reducing sparking and arcing when the high-voltage relay closes, and preventing damage to components from high-voltage surges, thereby improving the safety of vehicle charging.

[0114] In one possible implementation, as shown in Figure 5, the first pre-charge unit 1015 is connected in parallel across the two ends of the first switch K1. Alternatively, in another possible implementation, as shown in Figure 6, the first pre-charge unit 1015 is connected in parallel across the two ends of the second switch K2.

[0115] In this embodiment of the present disclosure, when the first pre-charging unit 1015 is connected in parallel across the two ends of the first switch K1, if the first pre-charging unit 1015 is working, then the first switch K1 is open. Conversely, when the first pre-charging unit 1015 is connected in parallel across the two ends of the second switch K2, if the first pre-charging unit 1015 is working, then the second switch K2 is open.

[0116] In other words, in this embodiment, the first pre-charging unit 1015 can be connected in parallel across the two ends of the first switch K1, or it can be connected in parallel across the two ends of the second switch K2. During the initial power-on phase, the first pre-charging unit 1015 operates, pre-charging with a smaller current to avoid damage to some components from high-voltage surges, thereby improving the reliability of vehicle charging.

[0117] In some embodiments, continuing to refer to FIG5 or FIG6, the first pre-charge unit 1015 includes a third switch K3 and a first resistor R1, wherein the third switch K3 and the first resistor R1 are connected in series, wherein:

[0118] The first pre-charging unit 1015 is used to control the first charging module 101 to enter the pre-charging mode when the third switch K3 is in the closed state; and / or to control the first charging module 101 to close the pre-charging mode when the third switch K3 is in the open state.

[0119] In this embodiment, the operation of the first pre-charging unit 1015 is controlled by the closing and opening of the third switch K3, thereby controlling whether the first charging module 101 enters the pre-charging mode. For example, in the initial power-on phase when the first device to be charged 202-1 is connected to the first charging module 101, closing the third switch K3 indicates that the first pre-charging unit 105 is working, meaning the first charging module 101 enters the pre-charging mode. At this time, the first power unit 1011 can control the AC power grid 201 to pre-charge the first device to be charged 202-1, i.e., to charge slowly with a smaller current. When the charging voltage of the first device to be charged 202-1 meets preset conditions (e.g., the charging voltage reaches a preset value, or the charging time reaches a preset time), opening the third switch K3 indicates that the first pre-charging unit 105 stops working, i.e., the first charging module 101 closes the pre-charging mode. At this time, the first power unit 1011 can control the AC power grid 201 to charge the first device to be charged 202-1, allowing for rapid charging with a larger current.

[0120] Thus, in this embodiment of the present disclosure, the third switch K3 is connected in series with the first resistor R1. Here, the first resistor R1 has a relatively large resistance value as a pre-charging resistor. When the third switch K3 is closed, the presence of the first resistor R1 can reduce the charging current at the beginning of power-on. At this time, pre-charging is performed with a smaller current to avoid damage to some components caused by high voltage impact, thereby improving the reliability of vehicle charging.

[0121] Understandably, in the embodiments of this disclosure, the first switch K1, the second switch K2, and the third switch K3 can be mechanical switches (e.g., knife switches), or relays, or semiconductor devices such as switching transistors, triodes, transistors, metal-oxide-semiconductor field-effect transistors (MOSFETs or MOS transistors), etc., without any limitation.

[0122] In some embodiments, as shown in FIG4, FIG5 or FIG6, the first power unit 1011 may include a first power device T1, a second power device T2, a third power device T3 and a fourth power device T4. That is, the first power unit 1011 includes an H-bridge circuit composed of four power devices.

[0123] In this embodiment, the first power device T1 and the fourth power device T4 are connected in series, and the first input terminal of the first charging module 101 is led out from the series branch of the first power device T1 and the fourth power device T4; the second power device T2 and the third power device T3 are connected in series, and the second input terminal of the first charging module 101 is led out from the series branch of the second power device T2 and the third power device T3; moreover, the first terminal of the first power device T1 and the first terminal of the second power device T2 are connected, and the second terminal of the fourth power device T4 and the second terminal of the third power device T3 are connected.

[0124] In this embodiment of the disclosure, taking the first charging module 101 as an example, through the working states of these four power devices (first power device T1, second power device T2, third power device T3 and fourth power device T4, etc.), not only can the AC grid charge the three devices to be charged at the same time, but the three devices to be charged can also feed back electrical energy to the AC grid together, thereby realizing the vehicle-to-grid (V2G) function.

[0125] In some embodiments, the charging device 10 may further include a control module for sending drive signals to four power devices, wherein the drive signals are used to control the on and off states of the corresponding power devices. For example, if the drive signal is at a high level, the corresponding power device is turned on; if the drive signal is at a low level, the corresponding power device is turned off.

[0126] For example, the control module sends a first drive signal to the first power device T1 and controls the first power device T1 to turn on and off according to the level state of the first drive signal (e.g., low level and high level); the control module sends a second drive signal to the second power device T2 and controls the second power device T2 to turn on and off according to the level state of the second drive signal; the control module sends a third drive signal to the third power device T3 and controls the third power device T3 to turn on and off according to the level state of the third drive signal; the control module sends a fourth drive signal to the fourth power device T4 and controls the fourth power device T4 to turn on and off according to the level state of the fourth drive signal.

[0127] In this embodiment, taking the charging of a first device to be charged by an AC power grid as an example, during the positive half-cycle of the first voltage of the AC power grid 201, the first power device T1 and the third power device T3 are controlled to be in the on state, while the second power device T2 and the fourth power device T4 are in the off state. The first power unit 1011 performs voltage conversion on the first voltage and provides the obtained first output voltage to the first device to be charged 202-1 for charging. During the negative half-cycle of the first voltage of the AC power grid 201, the first power device T1 and the third power device T3 are controlled to be in the off state, while the second power device T2 and the fourth power device T4 are in the on state. The first power unit 1011 performs voltage conversion on the first voltage and provides the obtained first output voltage to the first device to be charged 202-1 for charging. Here, the first voltage of the AC power grid 201 is an AC voltage, and the obtained first output voltage is a DC voltage; that is, the voltage during the charging process is converted from AC to DC, for example, by an AC / DC converter.

[0128] In this embodiment, taking the feedback of electrical energy from the first device to be charged to the AC power grid as an example, firstly, the first power device T1 and the third power device T3 are controlled to be in the on state, while the second power device T2 and the fourth power device T4 are in the off state. The first power unit 1011 performs voltage conversion on the DC voltage provided by the first device to be charged, and feeds back the obtained positive half-cycle voltage to the AC power grid 201. Then, the first power device T1 and the third power device T3 are controlled to be in the off state, while the second power device T2 and the fourth power device T4 are in the on state. The first power unit 1011 performs voltage conversion on the DC voltage provided by the first device to be charged, and feeds back the obtained negative half-cycle voltage to the AC power grid 201. The voltage conversion during the feedback of electrical energy to the AC power grid is a reverse conversion from DC to AC.

[0129] In other words, in this embodiment of the present disclosure, the first power unit 1011 is an H-bridge circuit composed of four power devices, which makes the circuit structure of the first charging module 101 simple and low in cost; moreover, when all three charging modules use H-bridge circuits, not only can multiple connection methods on the AC side be realized (such as star connection and delta connection), but also the AC grid can charge the three devices to be charged at the same time, and the three devices to be charged can feed back electrical energy to the AC grid together, realizing V2G function.

[0130] It is also understood that in the embodiments of this disclosure, the power device can be a switching transistor, a triode, a transistor, an insulated-gate bipolar transistor (IGBT), a metal-oxide-semiconductor field-effect transistor (MOSFET), or a MOS transistor, etc., and no limitation is made here.

[0131] It is also understood that in this embodiment of the present disclosure, the second charging module 102 and the third charging module 103 have the same circuit structure as the first charging module 101, that is, all three charging modules use H-bridge circuits, which not only simplifies the circuit structure and reduces costs. In addition, the use of H-bridge circuits by these three charging modules also enables star or delta connection on the input side, thereby controlling the AC power grid 201 to charge the three devices to be charged simultaneously, and ensuring the three-phase balance of the AC power grid during the charging process, thereby improving charging efficiency.

[0132] In some embodiments, as shown in FIG4, FIG5 or FIG6, the first charging module 101 may further include a first capacitor C1, which is connected in parallel across the two ends of the first power unit 1011.

[0133] In this embodiment, the first capacitor C1 can serve as an energy storage filter and voltage stabilizer, and can also improve power quality, reduce electromagnetic interference and noise emitted by the charging device 10, thereby improving the working stability of the charging device 10.

[0134] In some embodiments, as shown in FIG4, FIG5 or FIG6, the first power unit 1011 may further include a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4. The first diode D1 is connected in parallel to the first terminal and the second terminal of the first power device T1, the second diode D2 is connected in parallel to the first terminal and the second terminal of the second power device T2, the third diode D3 is connected in parallel to the first terminal and the second terminal of the third power device T3, and the fourth diode D4 is connected in parallel to the first terminal and the second terminal of the fourth power device T4.

[0135] In the embodiments disclosed herein, whether it is the first diode D1, the second diode D2, the third diode D3, or the fourth diode D4, they can be integrated inside the corresponding power device, that is, they are the body diodes of the corresponding power device. For example, the first diode D1 is the body diode of the first power device T1, the second diode D2 is the body diode of the second power device T2, the third diode D3 is the body diode of the third power device T3, and the fourth diode D4 is the body diode of the fourth power device T4. Alternatively, they can also be separately disposed from the corresponding power device, that is, they are independent components. For example, the first diode D1 is independently disposed from the first power device T1, the second diode D2 is independently disposed from the second power device T2, the third diode D3 is independently disposed from the third power device T3, and the fourth diode D4 is independently disposed from the fourth power device T4; no limitation is made here.

[0136] It is also understood that, in this embodiment of the present disclosure, if the grid voltage of the AC power grid 201 is too high and not suitable for the input of the charging device 10, the grid voltage of the AC power grid 201 can be transformed, and the transformed three-phase AC power can be used as the input of the charging device 10.

[0137] In some embodiments, based on the charging device 10 shown in FIG1 and referring to FIG7, the charging device 10 may further include a first transformer U1. The input terminal of the first transformer U1 is the AC power grid 201, and the output terminal of the first transformer U1 is connected to the input terminals of the three charging modules.

[0138] In this embodiment, the first transformer U1 can be a three-phase power frequency transformer, which converts the voltage of the AC power grid into the three-phase AC power required by the charging device 10. For example, the voltage of the AC power grid is 500kV, 220kV, 110kV, 35kV, 10kV, 6kV, 3kV, etc., which can be converted into 380V three-phase AC power by the first transformer U1.

[0139] In this embodiment, the charging device 10 can support high-power fast charging. That is, compared to single-phase AC power in related technologies, the three-phase AC power here can provide greater charging capacity, thereby improving the charging speed.

[0140] In some embodiments, the charging device 10 may further include an energy storage module, wherein: the energy storage module is connected to the first device to be charged 202-1 through the first charging interface of the output end of the first charging module 101, the energy storage module is connected to the second device to be charged 202-2 through the second charging interface of the output end of the second charging module 102, and the energy storage module is connected to the third device to be charged 202-3 through the third charging interface of the output end of the third charging module 103.

[0141] In the embodiments disclosed herein, the energy storage module may contain only one energy storage element, or it may contain multiple energy storage elements. The energy storage element can take various forms, including, for example, batteries, supercapacitors, flywheel energy storage, gas compression energy storage, or any combination thereof. Alternatively, other devices known in the art capable of storing electrical energy, such as secondary batteries, may be selected. Those skilled in the art can choose from these devices according to actual needs.

[0142] In one specific embodiment, the energy storage element can be a battery, and the energy storage module can be composed of one or more batteries connected in series and parallel. In this case, the energy storage module can also be called a battery module.

[0143] In this embodiment, during the process of simultaneously charging three devices to be charged by the AC power grid 201 through three charging modules (i.e., the first charging module 101, the second charging module 102, and the third charging module 103), the energy provided by the energy storage module and the energy provided by the AC power grid can also be supplied to the three devices to be charged simultaneously. Thus, this embodiment allows the AC power grid and the energy storage module to simultaneously power the three devices to be charged. Compared to the previous embodiment where only the AC power grid 201 was used to charge the three devices, this method of simultaneous power supply from the AC power grid and the energy storage module in this embodiment can provide higher charging power to the three devices, further shortening the charging time and improving charging efficiency, thereby achieving fast charging or supercharging functionality.

[0144] This disclosure provides a charging device in which a first charging module 101 receives a first voltage from the AC power grid, a second charging module 102 receives a second voltage from the AC power grid, and a third charging module 102 receives a third voltage from the AC power grid. The first, second, and third voltages have the same frequency and amplitude, and are 120 degrees out of phase. This charging device allows for simultaneous charging of three devices, avoiding queuing for electric vehicles and improving charging efficiency. Furthermore, the three charging modules are connected to the three voltages of the AC power grid respectively, and the 120-degree phase difference between these voltages simplifies the circuit structure of the charging device. Compared to scenarios where multiple vehicles are charged simultaneously in related technologies, this reduces the construction cost of charging stations and lowers overall costs. Simultaneous charging of three vehicles also ensures the three-phase balance of the AC power grid, preventing damage to components and improving vehicle charging safety.

[0145] In another embodiment of this disclosure, FIG8 is a schematic flowchart of a charging method provided by an embodiment of this disclosure. As shown in FIG8, the charging method includes:

[0146] S801, the first charging module receives the first voltage from the AC power grid, converts the first voltage into a first output voltage, and provides it to the first device to be charged for charging.

[0147] S802, the second charging module receives the second voltage from the AC power grid, converts the second voltage into a second output voltage, and provides it to the second device to be charged for charging.

[0148] S803, the third charging module receives the third voltage from the AC power grid, converts the third voltage into a third output voltage, and provides it to the third device to be charged for charging.

[0149] In this embodiment, the first, second, and third voltage channels have the same frequency and amplitude, and are 120 degrees out of phase. Furthermore, this charging method is applied to a charging device comprising three charging modules: a first charging module, a second charging module, and a third charging module. These three modules correspond one-to-one with the first, second, and third devices to be charged. Moreover, these three charging modules control the three voltage channels of the AC power grid to simultaneously charge the first, second, and third devices to be charged.

[0150] In this embodiment of the disclosure, the AC power grid can be a three-phase AC power supply. Specifically, the three-phase AC power supply consists of three AC power supplies with the same frequency, equal amplitude, and a phase difference of 120°, which are usually represented by phase A, phase B, and phase C. Among them, the voltage of each phase A, phase B, and phase C can be called the phase voltage, and the voltage between any two phases is called the line voltage.

[0151] In this embodiment of the disclosure, the three voltages of the AC power grid can refer to the phase voltages of phases A, B, and C, or they can refer to the line voltages between phases A, B, and C. Here, whether it is three phase voltages or three line voltages, they can be regarded as consisting of three AC currents with the same frequency and amplitude, and a phase difference of 120 degrees.

[0152] In this embodiment, three voltage lines from the AC power grid are utilized, with each voltage line's output connected to a charging module. Each charging module then charges the corresponding connected device. Specifically, the first charging module receives the first voltage line from the AC power grid, the second charging module receives the second voltage line, and the third charging module receives the third voltage line. These three charging modules can control the three voltage lines of the AC power grid to simultaneously charge three devices, avoiding queuing for electric vehicles and improving charging efficiency. Furthermore, the three charging modules are connected to the three voltage lines of the AC power grid, with a 120-degree phase difference between them, which simplifies the circuit structure of the charging device and reduces costs. Simultaneous charging of three vehicles also ensures the three-phase balance of the AC power grid, preventing damage to components and improving vehicle charging safety.

[0153] In some embodiments, to improve charging reliability, referring to Figure 9, the charging method may further include:

[0154] S901, when it detects that the charging device is connected to three devices to be charged at the same time, controls all three charging modules to enter the pre-charging mode, and controls the three voltages of the AC power grid through the power unit in the three charging modules to pre-charge the first device to be charged, the second device to be charged, and the third device to be charged at the same time.

[0155] S902, when it is detected that the charging voltage of the three devices to be charged all meet the preset conditions, controls the three charging modules to turn off the pre-charging mode, and controls the three voltages of the AC power grid through the power unit in the three charging modules to continue to charge the first, second and third devices to be charged simultaneously.

[0156] In this embodiment of the disclosure, if it is detected that the charging device is simultaneously connected to three devices to be charged, then at the initial stage of power-on, all three charging modules are controlled to enter the pre-charging mode. That is, when all three charging modules are in the pre-charging mode, the power units in the three charging modules control the three voltages of the AC power grid to simultaneously pre-charge the first, second, and third devices to be charged, i.e., to charge them slowly with a smaller current.

[0157] In this embodiment, if the charging voltages of the three devices to be charged all meet preset conditions (e.g., the charging voltage reaches a preset value, or the charging time reaches a preset duration), then the three charging modules can be controlled to turn off the pre-charging mode. That is, when the three charging modules have turned off the pre-charging mode, the power units in the three charging modules control the three voltages of the AC power grid to continue simultaneously charging the first, second, and third devices to be charged, using a larger current for rapid charging.

[0158] Thus, in this embodiment, when three devices to be charged are simultaneously connected to the charging device, the pre-charging units in all three charging modules start working, so that all three charging modules enter the pre-charging mode. At this time, the power units in the three charging modules can control the AC power grid to pre-charge the three devices to be charged, that is, to charge slowly with a small current. When the charging voltage of the three devices to be charged meets the preset conditions, the pre-charging units in the three charging modules stop working, so that all three charging modules close the pre-charging mode. At this time, the power units in the three charging modules can control the AC power grid to charge the three devices to be charged, and to charge quickly with a large current. This not only avoids damage to some components caused by high voltage impact and improves the reliability of vehicle charging, but also increases the charging speed of the three devices to be charged.

[0159] Understandably, in the embodiments of this disclosure, the first charging module, the second charging module, and the third charging module have the same circuit structure, and considering the three-phase balance of the AC power grid, the three charging modules have the same charging power to enable simultaneous charging of the three devices to be charged.

[0160] It is also understood that, in this embodiment of the disclosure, since the three charging modules have the same circuit structure, the same working principle, and the same charging and discharging operation, the following description takes the first charging module as an example. The first charging module may include at least a first power unit, a first switching unit, and a first pre-charging unit. The first switching unit includes a first switch and a second switch, and the first pre-charging unit includes a third switch and a first resistor.

[0161] For example, as shown in Figures 4, 5 and 6 above, the first switch is connected between the positive terminal of the first power unit and the positive terminal of the first charging interface, and the second switch is connected between the negative terminal of the first power unit and the negative terminal of the first charging interface.

[0162] In this embodiment of the disclosure, for the first pre-charging unit, the third switch is connected in series with the first resistor. Here, the first resistor has a large resistance value as a pre-charging resistor. When the third switch is closed, the presence of the first resistor can reduce the charging current at the beginning of power-on. At this time, pre-charging is performed with a smaller current to avoid damage to some components caused by high voltage impact, thereby improving the reliability of vehicle charging.

[0163] In one possible implementation, when the first pre-charging unit is connected in parallel across the two ends of the first switch, the charging method may further include: when it is detected that the charging device is simultaneously connected to three devices to be charged, closing the second switch and the third switch to enable the first charging module to enter the pre-charging mode; and when it is detected that the charging voltages of the three devices to be charged all meet the preset conditions, closing the first switch and opening the third switch to enable the first charging module to close the pre-charging mode.

[0164] In this embodiment of the present disclosure, the first pre-charging unit is controlled to operate based on the closing and opening of the third switch, thereby controlling whether the first charging module enters the pre-charging mode.

[0165] For example, taking the first charging module as an example, when the first device to be charged is detected to be connected, the third switch is closed and the second switch is closed simultaneously, indicating that the first pre-charging unit starts working, that is, the first charging module enters the pre-charging mode. When the charging voltage of the first device to be charged meets the preset conditions (e.g., the charging voltage reaches a preset value, or the charging time reaches a preset time, etc.), the third switch is opened and the first switch is closed simultaneously, indicating that the first pre-charging unit stops working, that is, the first charging module closes the pre-charging mode.

[0166] In other words, in this embodiment of the present disclosure, when it is detected that the charging device is simultaneously connected to three devices to be charged, the second switch and the third switch are closed, indicating that the pre-charging unit in the first charging module starts working, that is, the first charging module enters the pre-charging mode; similarly, it is determined that the second charging module and the third charging module have entered the pre-charging mode. At this time, due to the presence of the first resistor, the power units in the three charging modules can slowly charge the three devices to be charged with a smaller current; when it is detected that the charging voltage of the three devices to be charged meets the preset conditions, the first switch is closed and the third switch is opened, that is, the first charging module closes the pre-charging mode; similarly, after it is determined that the second charging module and the third charging module have closed the pre-charging mode, the power units in the three charging modules can quickly charge the three devices to be charged with a larger current.

[0167] Thus, in this embodiment of the present disclosure, when it is detected that the charging device is simultaneously connected to three devices to be charged, taking the first charging module as an example, the second switch and the third switch are closed, indicating that the pre-charging unit in the first charging module starts working, that is, the first charging module enters the pre-charging mode; when it is detected that the charging voltage of the three devices to be charged all meet the preset conditions, the first switch is closed and the third switch is opened, that is, the first charging module closes the pre-charging mode; thereby, in the pre-charging mode, high voltage impact can be avoided from damaging some components, improving the reliability of vehicle charging, and the charging speed of the devices to be charged can also be improved after the pre-charging mode is closed.

[0168] In another possible implementation, when the first pre-charging unit is connected in parallel across the two ends of the second switch, the charging method may further include: when it is detected that the charging device is simultaneously connected to three devices to be charged, closing the first switch and the third switch to enable the first charging module to enter the pre-charging mode; and when it is detected that the charging voltages of the three devices to be charged all meet the preset conditions, closing the second switch and opening the third switch to enable the first charging module to close the pre-charging mode.

[0169] In this embodiment of the disclosure, the first pre-charging unit is connected in parallel across the two ends of the first switch, or the first pre-charging unit is connected in parallel across the two ends of the second switch. The operation process of both is similar, still controlling whether the first pre-charging unit works based on the closing and opening of the third switch, and thus controlling whether the first charging module enters the pre-charging mode.

[0170] For example, taking the first charging module as an example, when the first device to be charged is detected to be connected, the third switch is closed and the first switch is closed simultaneously, indicating that the first pre-charging unit starts working, that is, the first charging module enters the pre-charging mode. When the charging voltage of the first device to be charged meets the preset conditions (e.g., the charging voltage reaches a preset value, or the charging time reaches a preset time, etc.), the third switch is opened and the second switch is closed simultaneously, indicating that the first pre-charging unit stops working, that is, the first charging module closes the pre-charging mode.

[0171] In other words, in this embodiment of the present disclosure, when it is detected that the charging device is connected to three devices to be charged at the same time, taking the first charging module as an example, the first switch and the third switch are closed, indicating that the pre-charging unit in the first charging module starts to work, that is, the first charging module enters the pre-charging mode; when it is detected that the charging voltage of the three devices to be charged meets the preset conditions, the second switch is closed and the third switch is opened, that is, the first charging module closes the pre-charging mode; thus, in the pre-charging mode, high voltage impact can be avoided from damaging some components, improving the reliability of vehicle charging, and the charging speed of the devices to be charged can also be improved after the pre-charging mode is closed.

[0172] It is also understood that, in the embodiments of this disclosure, the first power unit in the first charging module may include a first power device, a second power device, a third power device and a fourth power device.

[0173] In some embodiments, taking the first charging module as an example, for step S801, the first charging module receives a first voltage from the AC power grid, converts the first voltage into a first output voltage, and provides it to the first device to be charged for charging. This may include: during the positive half-cycle of the first voltage, controlling the first power device and the third power device to be in a conducting state, and the second power device and the fourth power device to be in a turning state, the first power unit performs voltage conversion on the first voltage and provides the obtained first output voltage to the first device to be charged for charging; during the negative half-cycle of the first voltage, controlling the first power device and the third power device to be in a turning state, and the second power device and the fourth power device to be in a conducting state, the first power unit performs voltage conversion on the first voltage and provides the obtained first output voltage to the first device to be charged for charging.

[0174] In this embodiment, taking the charging of a first device to be charged by an AC power grid as an example, during the positive half-cycle of the first voltage of the AC power grid, the first power device T1 and the third power device T3 are controlled to be in a conducting state, while the second power device T2 and the fourth power device T4 are in a turning state. The first power unit performs voltage conversion on the first voltage and provides the resulting first output voltage to the first device to be charged for charging. During the negative half-cycle of the first voltage of the AC power grid, the first power device T1 and the third power device T3 are controlled to be in a turning state, while the second power device T2 and the fourth power device T4 are in a conducting state. The first power unit performs voltage conversion on the first voltage and provides the resulting first output voltage to the first device to be charged for charging. Here, the first voltage of the AC power grid is an AC voltage, and the resulting first output voltage is a DC voltage; that is, the voltage during the charging process is converted from AC to DC, for example, by an AC / DC converter.

[0175] In this embodiment, four power devices can be used to switch the voltage polarity applied to the first device to be charged. Specifically, during the positive half-cycle, the first power device T1 and the third power device T3 are controlled to be in the on state, while the second power device T2 and the fourth power device T4 are in the off state. The first power unit converts the first voltage into a first output voltage to provide charging for the first device to be charged. During the negative half-cycle, the first power device T1 and the third power device T3 are controlled to be in the off state, while the second power device T2 and the fourth power device T4 are in the on state. The first power unit converts the first voltage into a first output voltage to provide charging for the first device to be charged, thereby realizing the DC output of the first charging module. Similarly, the DC output of the second charging module and the third charging module can also be realized, thereby enabling the AC grid to charge the three devices to be charged simultaneously, improving charging efficiency.

[0176] In some embodiments, still taking the first charging module as an example, if the first device to be charged feeds back electrical energy to the AC power grid, the charging method may further include: controlling the first power device and the third power device to be in a conducting state, and the second power device and the fourth power device to be in a turning state, the first power unit performs voltage conversion on the DC voltage provided by the first device to be charged, and feeds back the obtained positive half-cycle voltage to the AC power grid; controlling the first power device and the third power device to be in a turning state, and the second power device and the fourth power device to be in a conducting state, the first power unit performs voltage conversion on the DC voltage provided by the first device to be charged, and feeds back the obtained negative half-cycle voltage to the AC power grid.

[0177] In this embodiment, the voltage conversion during the feedback of electrical energy to the AC grid can be a reverse conversion from direct current (DC) to alternating current (AC). Specifically, the DC-to-AC inversion can be achieved by switching four power devices. First, the first power device T1 and the third power device T3 are controlled to be in the ON state, while the second power device T2 and the fourth power device T4 are in the OFF state. The first power unit inverts the DC voltage provided by the first device to be charged into a positive half-cycle AC voltage, which is then fed back to the AC grid. Then, the first power device T1 and the third power device T3 are controlled to be in the OFF state, while the second power device T2 and the fourth power device T4 are in the ON state. The first power unit inverts the DC voltage provided by the first device to be charged into a negative half-cycle AC voltage, which is then fed back to the AC grid.

[0178] In other words, in this embodiment of the present disclosure, the first power unit 1011 is an H-bridge circuit composed of four power devices, which makes the circuit structure of the first charging module 101 simple and low in cost; moreover, when all three charging modules use H-bridge circuits, not only can multiple connection methods on the AC side be realized (such as star connection and delta connection), but also the AC grid can charge the three devices to be charged at the same time, and the three devices to be charged can feed back electrical energy to the AC grid together, realizing V2G function.

[0179] This disclosure provides a charging method in which a first charging module receives a first voltage from the AC power grid, converts it into a first output voltage, and provides it to a first device to be charged. A second charging module receives a second voltage from the AC power grid, converts it into a second output voltage, and provides it to a second device to be charged. A third charging module receives a third voltage from the AC power grid, converts it into a third output voltage, and provides it to a third device to be charged. This charging method allows for the simultaneous charging of three devices (e.g., electric vehicles), avoiding queuing and improving charging efficiency. Furthermore, the three charging modules are connected to three separate voltage lines from the AC power grid, with a 120-degree phase difference between them, simplifying the circuit structure of the charging device. Compared to scenarios where multiple vehicles are charged simultaneously in related technologies, this method reduces the construction cost of charging stations and lowers overall costs. Simultaneous charging of three vehicles also ensures the three-phase balance of the AC power grid, preventing damage to components and improving the safety of vehicle charging.

[0180] In another embodiment of this disclosure, FIG10 is a schematic diagram of the composition structure of a charging system provided in an embodiment of this disclosure. As shown in FIG10, the charging system 100 may include three devices to be charged and a charging device 10 as described in any of the foregoing embodiments. The three devices to be charged include a first device to be charged 202-1, a second device to be charged 202-2, and a third device to be charged 202-3, wherein:

[0181] The first charging module 101 is connected to the first device to be charged 202-1 and is used to control the first voltage of the AC power grid 201 to charge the first device to be charged 202-1.

[0182] The second charging module 102 is connected to the second device to be charged 202-2 and is used to control the second voltage of the AC power grid 201 to charge the second device to be charged 202-2.

[0183] The third charging module 103 is connected to the third device to be charged 202-3 and is used to control the third voltage of the AC power grid 201 to charge the third device to be charged 202-3.

[0184] In some embodiments, as shown in FIG10, the charging system 100 may further include three charging guns, namely a first charging gun 203-1, a second charging gun 203-2, and a third charging gun 203-3.

[0185] Specifically, for the first charging module 101, the second charging module 102, and the third charging module 103, each of the three charging modules has a charging interface at its output end (e.g., the first charging interface 1013 corresponding to the first charging module 101). Moreover, one end of each charging gun is connected to the corresponding charging interface, and the other end of each charging gun is inserted into the corresponding position of the device to be charged, so as to realize the charging connection between the charging gun and the corresponding device to be charged.

[0186] In this embodiment of the present disclosure, the charging gun can be fixedly connected to the corresponding charging interface as part of the charging device 10. In this case, the charging interface can also be regarded as the charging gun, which is used to realize the connection between the charging module and the corresponding device to be charged through the charging gun; or it can be set separately from the charging device 10. When charging is required, one end of the charging gun is connected to the corresponding charging interface, and the other end of the charging gun is inserted into the device to be charged.

[0187] For example, taking the first charging module 101 as an example, one end of the first charging gun is connected to the first charging interface, and the other end of the first charging gun is connected to the first device to be charged 202-1. Here, the first charging gun can be fixedly connected to the first charging interface of the charging device 10, as part of the charging device 10; or the first charging gun can be set separately from the charging device 10, and when it is necessary to charge the first device to be charged 202-1, the user connects the first device to be charged 202-1 to the charging device 10 through the first charging gun.

[0188] This disclosure provides a charging system 100 in which three devices can be charged simultaneously using a charging device, avoiding queuing for electric vehicles and improving charging efficiency. Furthermore, the three charging modules are connected to three separate voltage lines of the AC power grid, with a 120-degree phase difference between them, which simplifies the circuit structure of the charging device. Compared to scenarios where multiple vehicles are charged simultaneously in related technologies, this also reduces the construction cost of charging stations and lowers overall costs. Simultaneous charging of three vehicles also ensures the three-phase balance of the AC power grid, preventing damage to components and improving the safety of vehicle charging.

[0189] In one specific embodiment, Figure 11 is a detailed structural schematic diagram of a charging system provided in an embodiment of this disclosure, and Figure 12 is a detailed structural schematic diagram of a charging system provided in an embodiment of this disclosure. As shown in Figure 11 or Figure 12, the charging system 100 may include a first charging module 101, a second charging module 102, a third charging module 103, a first transformer U1, an AC power grid 201, a first charging gun 203-1, a second charging gun 203-2, a third charging gun 203-3, a first device to be charged 202-1, a second device to be charged 202-2, and a third device to be charged 202-3.

[0190] In this embodiment, the first charging module 101 charges the first device to be charged 202-1 through the first charging gun 203-1, the second charging module 102 charges the second device to be charged 202-2 through the second charging gun 203-2, and the third charging module 103 charges the third device to be charged 202-3 through the third charging gun 203-3. The device to be charged can be an electric vehicle. Additionally, the first transformer U1 converts the voltage of the AC power grid 201 into the three-phase AC power required by the charging device 10. For example, the voltage of the AC power grid can be 500kV, 220kV, 110kV, 35kV, 10kV, 6kV, 3kV, etc., which can be converted into 380V three-phase AC power by the first transformer U1.

[0191] In the first charging module 101, the first charging module 101 may include a first power device T1, a second power device T2, a third power device T3, a fourth power device T4, a first capacitor C1, a first fuse F1, a second fuse F2, a first switch K1, a second switch K2, a third switch K3, and a first resistor R1. The specific connection relationship is detailed in the first charging module 101 in Figure 10. Among them, the H-bridge circuit formed by the first power device T1, the second power device T2, the third power device T3, and the fourth power device T4 is the first power unit. The first fuse F1 and the second fuse F2 are the first protection devices. The third switch K3 and the first resistor R1 are connected in series to form a first pre-charging unit, and the first pre-charging unit is connected in parallel across the first switch K1.

[0192] In the second charging module 102, the second charging module 102 may include a fifth power device T5, a sixth power device T6, a seventh power device T7, an eighth power device T8, a second capacitor C2, a third fuse F3, a fourth fuse F4, a fourth switch K4, a fifth switch K5, a sixth switch K6, and a second resistor R2. The specific connection relationship is detailed in the second charging module 102 in Figure 10. Among them, the H-bridge circuit formed by the fifth power device T5, the sixth power device T6, the seventh power device T7, and the eighth power device T8 is the second power unit; the third fuse F3 and the fourth fuse F4 are the second protection devices; the sixth switch K6 and the second resistor R2 are connected in series to form a second pre-charging unit, and the second pre-charging unit is connected in parallel across the fourth switch K4.

[0193] In the third charging module 103, the third charging module 103 may include a ninth power device T9, a tenth power device T10, an eleventh power device T11, a twelfth power device T12, a third capacitor C3, a fifth fuse F5, a sixth fuse F6, a seventh switch K7, an eighth switch K8, a ninth switch K9, and a third resistor R3. The specific connection relationship is detailed in the third charging module 103 in Figure 10. Among them, the H-bridge circuit formed by the ninth power device T9, the tenth power device T10, the eleventh power device T11, and the twelfth power device T12 is the third power unit. The fifth fuse F5 and the sixth fuse F6 are the third protection devices. The ninth switch K9 and the third resistor R3 are connected in series to form the third pre-charging unit, and the third pre-charging unit is connected in parallel across the seventh switch K7.

[0194] In this embodiment, the third power unit in the third charging module 103 and the second power unit in the second charging module 102 have the same circuit structure (both are H-bridge structures) as the first power unit in the first charging module 101, and their working principles are similar. Similarly, the third protection device in the third charging module 103 and the second protection device in the second charging module 102 have the same circuit structure as the first protection device in the first charging module 101, and their working principles are similar. Likewise, the third pre-charging unit in the third charging module 103 and the second pre-charging unit in the second charging module 102 have the same circuit structure as the first pre-charging unit in the first charging module 101, and their working principles are similar. Based on the foregoing description of the relevant structure and working principle of the first charging module 101, further details are omitted here.

[0195] In this embodiment, the difference between Figure 11 and Figure 12 is that in Figure 11, the AC side connection of the three charging modules is a star connection. In this case, the first voltage of the AC power grid 201 is the phase voltage of phase A (denoted as Ua), the second voltage of the AC power grid 201 is the phase voltage of phase B (denoted as Ub), and the third voltage of the AC power grid 201 is the phase voltage of phase C (denoted as Uc). In Figure 12, the AC side connection of the three charging modules is a delta connection (or "Δ connection"). In this case, the first voltage of the AC power grid 201 is the line voltage between phase A and phase C (denoted as Uac), the second voltage of the AC power grid 201 is the line voltage between phase B and phase A (denoted as Uba), and the third voltage of the AC power grid 201 is the line voltage between phase C and phase B (denoted as Ucb).

[0196] In this embodiment of the disclosure, taking a charging pile as an example, in order to solve the problems of complex circuit structure of charging modules, high cost of charging piles, and low charging efficiency caused by multiple vehicles queuing for charging in related technologies, this embodiment of the disclosure provides a charging pile solution for three vehicles to charge simultaneously, specifically including the following:

[0197] (1) All three charging modules (first charging module 101, second charging module 102 and third charging module 103) adopt H-bridge structure power units, which enable the AC power grid to charge three cars simultaneously.

[0198] (2) All three charging modules (first charging module 101, second charging module 102 and third charging module 103) adopt H-bridge structure power units. Through the H-bridge structure power units, the three vehicles can also feed back electrical energy to the grid together to realize V2G function.

[0199] (3) In the H-bridge structure, the voltage polarity applied to the electric vehicle is achieved by switching four switches (e.g., T1 / T2 / T3 / T4 in the first charging module 101, T5 / T6 / T7 / T8 in the second charging module 102, and T9 / T10 / T11 / T12 in the third charging module 103, etc.), thereby realizing the DC output of the three charging modules. Taking Figure 11 as an example, during the positive half-cycle of phase Ua, in the first charging module 101, T1 and T3 are closed and T2 and T4 are opened, and the first charging gun 203-1 outputs DC power to charge the first device to be charged (e.g., the electric vehicle) 202-1; during the negative half-cycle of phase Ua, in the first charging module 101, T2 and T4 are closed and T1 and T3 are opened, and the first charging gun 203-1 outputs DC power to charge the first device to be charged (e.g., the electric vehicle) 202-1. Similarly, the second charging module 102 and the third charging module 103 change during the positive and negative half-cycles of the Ub and Uc phases.

[0200] For example, during the positive half-cycle of the Ub phase, in the second charging module 102, T5 and T7 are closed and T6 and T8 are opened, and the second charging gun 203-2 outputs DC power to charge the second device to be charged (e.g., an electric vehicle) 202-2; during the negative half-cycle of the Ub phase, in the second charging module 102, T6 and T8 are closed and T5 and T7 are opened, and the second charging gun 203-2 outputs DC power to charge the second device to be charged (e.g., an electric vehicle) 202-2. During the positive half-cycle of phase Uc, in the third charging module 103, T9 and T11 are closed, and T10 and T12 are opened. The third charging gun 203-3 outputs DC power to charge the third device to be charged (e.g., an electric vehicle) 202-3. During the negative half-cycle of phase Uc, in the third charging module 103, T10 and T12 are closed, and T9 and T11 are opened. The third charging gun 203-3 outputs DC power to charge the third device to be charged (e.g., an electric vehicle) 202-3.

[0201] (4) In the H-bridge structure, the DC to AC inversion is achieved by switching four power devices (such as T1 / T2 / T3 / T4 in the first charging module 101, T5 / T6 / T7 / T8 in the second charging module 102, and T9 / T10 / T11 / T12 in the third charging module 103, etc.), thereby realizing the V2G function.

[0202] This disclosure provides a charging system that utilizes three charging modules to simultaneously charge three devices, avoiding queuing for electric vehicles and improving charging efficiency. Furthermore, the three charging modules are connected to three separate voltage lines of the AC power grid, with a 120-degree phase difference between them. This simplifies the circuit structure of the charging device and reduces construction costs compared to simultaneous charging of multiple vehicles in related technologies. Simultaneous charging of three vehicles also ensures three-phase balance in the AC power grid, preventing damage to components and improving charging safety.

[0203] In yet another embodiment of this disclosure, a computer-readable storage medium is provided having a computer program stored thereon that, when executed, implements the charging method of any of the foregoing embodiments.

[0204] In yet another embodiment of this disclosure, a computer program product is also provided, including a computer program or instructions that, when executed, implement the charging method as described in any of the foregoing embodiments.

[0205] It should be understood that those skilled in the art will recognize that this disclosure may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0206] It should also be understood that the phrase "an embodiment" or "one embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this disclosure. Therefore, "in one embodiment" or "one embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this disclosure, the sequence numbers of the above steps / processes do not imply a sequential order of execution; the execution order of each step / process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this disclosure. The sequence numbers of the above embodiments of this disclosure are merely descriptive and do not represent the superiority or inferiority of the embodiments.

[0207] It should be noted that, in this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0208] In the several embodiments provided in this disclosure, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components may be combined, or integrated into another system, or some features may be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0209] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; they may be located in one place or distributed across multiple network units; some or all of the units may be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the embodiments of this disclosure, all functional units may be integrated into one processing unit, or each unit may be a separate unit, or two or more units may be integrated into one unit; the integrated unit may be implemented in hardware or in a combination of hardware and software functional units.

[0210] The above are merely preferred embodiments of this disclosure and are not intended to limit the scope of protection of this disclosure. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A charging device, the charging device comprising three charging modules, the three charging modules comprising a first charging module, a second charging module, and a third charging module, wherein: The first charging module is used to receive a first voltage from the AC power grid, convert the first voltage into a first output voltage, and provide it to the first device to be charged for charging. The second charging module is used to receive the second voltage from the AC power grid, convert the second voltage into a second output voltage, and provide it to the second device to be charged for charging. The third charging module is used to receive the third voltage from the AC power grid, convert the third voltage into a third output voltage, and provide it to the third device to be charged for charging. The first charging module, the second charging module, and the third charging module have a one-to-one correspondence with the first device to be charged, the second device to be charged, and the third device to be charged; the first voltage, the second voltage, and the third voltage have the same frequency and amplitude, and their phases differ by 120 degrees; and the three charging modules are used to control the three voltages of the AC power grid to charge the first device to be charged, the second device to be charged, and the third device to be charged simultaneously.

2. The charging device according to claim 1, wherein, The first input terminal of the first charging module is connected to the first phase line of the AC power grid; The first input terminal of the second charging module is connected to the second phase line of the AC power grid; The first input terminal of the third charging module is connected to the third phase line of the AC power grid; The second input terminal of the first charging module is connected to the second input terminal of the second charging module and the second input terminal of the third charging module, respectively.

3. The charging device according to claim 1, wherein, The first input terminal of the first charging module is connected to the first phase line of the AC power grid, and the second input terminal of the first charging module is connected to the third phase line of the AC power grid. The first input terminal of the second charging module is connected to the second phase line of the AC power grid, and the second input terminal of the second charging module is connected to the first phase line of the AC power grid. The first input terminal of the third charging module is connected to the third phase line of the AC power grid, and the second input terminal of the third charging module is connected to the second phase line of the AC power grid.

4. The charging device according to any one of claims 1 to 3, wherein, The first charging module, the second charging module, and the third charging module have the same circuit structure; The first charging module includes a first power unit, a first switch unit, and a first charging interface. The first switch unit is connected between the first power unit and the first charging interface, and the first charging interface is used to connect the first device to be charged.

5. The charging device according to claim 4, wherein, The first switching unit includes a first switch and / or a second switch, wherein: The first switch is connected between the positive terminal of the first power unit and the positive terminal of the first charging interface; The second switch is connected between the negative terminal of the first power unit and the negative terminal of the first charging interface.

6. The charging device according to claim 5, wherein, The first charging module further includes a first pre-charging unit, wherein: The first pre-charging unit is connected in parallel across the two ends of the first switch; or, The first pre-charge unit is connected in parallel across the two ends of the second switch.

7. The charging device according to claim 6, wherein, The first pre-charge unit includes a third switch and a first resistor, wherein the third switch is connected in series with the first resistor, wherein: The first pre-charging unit is configured to control the first charging module to enter the pre-charging mode when the third switch is in the closed state; and / or, control the first charging module to close the pre-charging mode when the third switch is in the open state.

8. The charging device according to any one of claims 4 to 7, wherein, The first charging module further includes a first protection device, wherein: The first protection device is connected between the first power unit and the first charging interface, and is used to control the path between the first power unit and the first charging interface to be disconnected when the first charging module fails.

9. The charging device according to claim 8, wherein, The first protection device includes a first fuse and / or a second fuse, wherein: The first fuse is connected between the positive terminal of the first power unit and the positive terminal of the first charging interface; The second fuse is connected between the negative terminal of the first power unit and the negative terminal of the first charging interface.

10. The charging device according to any one of claims 4 to 9, wherein, The first power unit includes an H-bridge circuit composed of four power devices.

11. A charging method applied to a charging device, the charging device comprising three charging modules, wherein the three charging modules include a first charging module, a second charging module, and a third charging module; the charging method comprising: The first charging module receives a first voltage from the AC power grid, converts the first voltage into a first output voltage, and provides it to the first device to be charged for charging. The second charging module receives a second voltage from the AC power grid, converts the second voltage into a second output voltage, and provides it to the second device to be charged for charging. The third charging module receives the third voltage from the AC power grid, converts the third voltage into a third output voltage, and provides it to the third device to be charged for charging. The first charging module, the second charging module, and the third charging module have a one-to-one correspondence with the first device to be charged, the second device to be charged, and the third device to be charged; the first voltage, the second voltage, and the third voltage have the same frequency and amplitude, and their phases differ by 120 degrees.

12. The charging method according to claim 11, wherein, The first charging module includes a first switching unit and a first pre-charging unit. The first switching unit includes a first switch and a second switch, and the first pre-charging unit includes a third switch and a first resistor. When the first pre-charging unit is connected in parallel across the first switch, the charging method further includes: When the charging device detects that three devices are connected to the charging device at the same time, the second switch and the third switch are closed to make the first charging module enter the pre-charging mode. When the charging voltage of the three devices to be charged is detected to meet the preset conditions, the first switch is closed and the third switch is opened, so that the first charging module turns off the pre-charging mode.

13. The charging method according to claim 12, wherein, When the first pre-charging unit is connected in parallel across the two ends of the second switch, the charging method further includes: When the charging device detects that three devices are connected to the charging device at the same time, the first switch and the third switch are closed to allow the first charging module to enter the pre-charging mode. When the charging voltage of the three devices to be charged is detected to meet the preset conditions, the second switch is closed and the third switch is opened, so that the first charging module turns off the pre-charging mode.

14. The charging method according to claim 12 or 13, wherein, The charging method further includes: When all three charging modules enter the pre-charging mode, the power units in the three charging modules control the three voltages of the AC power grid to simultaneously pre-charge the first device to be charged, the second device to be charged, and the third device to be charged. When all three charging modules are in pre-charging mode, the power units in the three charging modules control the three voltages of the AC power grid to continue charging the first device to be charged, the second device to be charged, and the third device to be charged simultaneously.

15. The charging method according to any one of claims 11 to 14, wherein, The first charging module includes a first power unit, and the first power unit includes a first power device, a second power device, a third power device, and a fourth power device; the first charging module receives a first voltage from the AC power grid, converts the first voltage into a first output voltage, and provides it to the first device to be charged for charging, including: During the positive half-cycle of the first voltage, the first power device and the third power device are controlled to be in the on state, while the second power device and the fourth power device are in the off state. The first power unit performs voltage conversion on the first voltage and provides the obtained first output voltage to the first device to be charged for charging. During the negative half-cycle of the first voltage, the first power device and the third power device are controlled to be in the off state, while the second power device and the fourth power device are in the on state. The first power unit performs voltage conversion on the first voltage and provides the obtained first output voltage to the first device to be charged for charging.

16. The charging method according to claim 15, wherein, The charging method further includes: The first power device and the third power device are controlled to be in the on state, while the second power device and the fourth power device are in the off state. The first power unit performs voltage conversion on the DC voltage provided by the first device to be charged and feeds back the obtained positive half-cycle voltage to the AC power grid. The first power device and the third power device are controlled to be in the off state, and the second power device and the fourth power device are in the on state. The first power unit performs voltage conversion on the DC voltage provided by the first device to be charged and feeds back the obtained negative half-cycle voltage to the AC power grid.

17. A charging system comprising three devices to be charged and a charging device as described in any one of claims 1 to 10, wherein the three devices to be charged comprise a first device to be charged, a second device to be charged, and a third device to be charged, wherein: The first charging module is connected to the first device to be charged and is used to control the first voltage of the AC power grid to charge the first device to be charged. The second charging module is connected to the second device to be charged and is used to control the second voltage of the AC power grid to charge the second device to be charged. The third charging module is connected to the third device to be charged and is used to control the third voltage of the AC power grid to charge the third device to be charged.

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