A group control charging machine system and control method

Abstract

The present application belongs to the field of DC charger control, and particularly relates to a group control charger system and a control method. The present application is provided with a charging module containing several power groups and bridge connection contactors connecting each power group in the charging module with the DC bus corresponding to the charging module, and distinguishes the host and the slave borrowed power corresponding to the same charging module through the charging controller, controls the bridge connection contactor of the host power group and the slave available power group to be closed, so that the host can borrow the power of the slave to output, without calculating and distributing the power, so as to simplify the control process; and when the power is borrowed, the bridge connection contactors of the power group corresponding to the host and all the available power groups corresponding to the slaves are controlled to be closed first, and when the borrowed power exceeds the charging demand, the bridge connection contactors of part of the slave power groups are disconnected, so that the control process is simple, and the cost of realizing the control effect that the output power can meet the demand and no power waste is generated is saved.

Description

Technical Field

[0001] This invention belongs to the field of DC charger control, specifically relating to a group-controlled charger system and control method. Background Technology

[0002] In recent years, my country's new energy vehicle industry has entered a stage of rapid development characterized by large-scale and high-quality growth. With the increase in new energy vehicle sales, the demand for charging piles has also been released, leading to a rapid increase in the number of charging infrastructure facilities. However, against the backdrop of rapid development in charging infrastructure construction, issues such as low utilization rate of charging resources, low level of charging intelligence, poor charging power compatibility, and slow and difficult construction of charging stations have become urgent problems to be solved.

[0003] Most existing DC chargers are either integrated or separate group-controlled models, which suffer from issues such as fixed rated output power, poor compatibility, large footprint, and high construction costs. They also cannot charge vehicles with varying power requirements. When a vehicle's charging demand is low, the charger cannot reach full power output, resulting in wasted power. When a vehicle's charging demand is high, the fixed rated output power cannot be flexibly configured, easily leading to insufficient output power to meet the vehicle's charging needs, thus reducing user experience and convenience.

[0004] Chinese invention patent application CN108528249A discloses a group-controlled charging system and a matrix switch module. The device includes N charger modules, N matrix switch modules, and M charging pile modules. When a charging terminal needs to charge and there is unallocated output power margin in the charging system, the system obtains the required output voltage and current parameters of the electric vehicle at the charging terminal, compares the charging power demand of the electric vehicle at the charging terminal with the remaining unallocated power of the charging system, and the power control unit allocates the required charger modules and matrix switch modules to the charging terminal according to the comparison result and issues corresponding control commands. However, the computational load required to uniformly determine the allocation method of charger modules and matrix switch modules through the power control unit is large, and the control method of issuing commands to each allocated charger module and matrix switch module according to the calculation result also needs to be adapted to a complex information interaction system, making the control process of the group-controlled charging system quite complex. Summary of the Invention

[0005] The purpose of this invention is to provide a group-controlled charger system and control method to solve the problem of the complex control process of existing group-controlled charger systems.

[0006] To achieve the above objectives, the present invention provides a group-controlled charger system, including a charger and its corresponding charging module; the charging module includes several power groups for providing the output power of the charger; it also includes a bridging contactor for each power group; the power groups in the charger and its corresponding charging module are used to form a charging circuit with the device to be charged, and the bridging contactor is used to connect each power group in the charging module to the DC bus corresponding to the charging module.

[0007] It also includes a charging controller, which is used to designate the charger that starts charging as the master and the other chargers in the same charging module as the master as slaves; it detects the output power of the master at certain time intervals, and if it is determined that the output power cannot meet the needs of the device to be charged, and each slave is not in the state of borrowing the bus, it closes the bridge contactor of the power group corresponding to the master and the bridge contactor of the power group corresponding to each slave that is in the available state.

[0008] The beneficial effects of the above technical solution are as follows: a charging module containing several power groups is set up, and a bridge contactor is used to connect each power group in the charging module to the DC bus corresponding to the charging module. By using a charging controller to distinguish between the master unit for charging and the slave unit for borrowing power corresponding to the same charging module, the bridge contactor of the master unit power group and the slave unit available power group is closed accordingly. This allows the master unit to borrow power from the slave unit to increase its own output power through the DC bus. There is no need to calculate the power distribution method and issue power output commands according to the distribution method. Therefore, the structure of this group control charger system can simplify the control process of the group control charger system.

[0009] Furthermore, the charging controller is also used to verify the power group with the bridge contactor closed. If the total power of the power group exceeds the requirements of the device to be charged, the bridge contactor of the corresponding slave device in the available power group is disconnected.

[0010] The beneficial effects of the above technical solution are as follows: When the output power of the host cannot meet the needs of the device to be charged, the charging controller first controls the closing of the bridge contactors of the power group corresponding to the host and all the available power groups corresponding to the slave devices to achieve power borrowing; when it is determined that the borrowed power (i.e., the total power of the power groups connected to the bus) exceeds the needs of the device to be charged, the bridge contactors of some slave power groups are then disconnected; this is equivalent to first borrowing all available power groups in a unified manner, and then selectively cutting off some power groups according to the charging needs. Therefore, only a simple calculation and control process is needed to achieve the effect of allocating charger output with equivalent power according to the charging needs of the vehicle, saving the control cost of achieving the control effect of output power meeting the needs without power waste.

[0011] Furthermore, if it is determined that the output power of the host device itself cannot meet the requirements of the device being charged, and each slave device is not in a state of borrowing the bus, then the methods for closing the bridge contactor of the power group corresponding to the host device and the bridge contactor of the power group corresponding to each slave device that is in an available state include:

[0012] If it is determined that the output power of the host cannot meet the needs of the device to be charged, a request to borrow the bus is sent through the corresponding communication module of the host. When each slave device receives the request through its corresponding communication module, it determines whether it is in the state of borrowing the bus. If it is in the state of borrowing the bus, it replies with the first judgment information; otherwise, it replies with the second judgment information.

[0013] If all slave devices respond with the second judgment information, then close the bridge contactor of the power group corresponding to the master device.

[0014] If any slave device responds with the first judgment information, the request to borrow the bus will continue to be sent according to a certain sending cycle until all slave devices corresponding to the sent request to borrow the bus respond with the second judgment information. Then the bridge contactor of the power group corresponding to the master device will be closed.

[0015] Furthermore, if it is determined that the output power of the host device itself cannot meet the requirements of the device being charged, and each slave device is not in a state of borrowing the bus, then the methods for closing the bridge contactor of the power group corresponding to the host device and the bridge contactor of the power group corresponding to each slave device that is in an available state also include:

[0016] After closing the bridge contactor of the power group corresponding to the host, a power borrowing request is sent to other slave devices through the communication module corresponding to the host. If other slave devices receive the request through their corresponding communication modules, they determine whether their respective power groups are in an available state. If a power group is found to be in an available state, the host replies with the third judgment information and closes the bridge contactor of that power group.

[0017] Furthermore, it also includes a power group connected in series in the charger and the corresponding charging module, and a DC contactor in the charging circuit formed by the device to be charged;

[0018] The charging controller is also used to determine that the slave device is in a borrowed power state if the bridge contactor of the power group corresponding to the slave device is closed during the charging process, and accordingly keep the DC contactor of the slave device in the open state so that the charging circuit remains open.

[0019] The beneficial effects of the above technical solution are: it can prevent the borrowed slave device from being used for charging operations, which would cause changes in the power output of the master device that is borrowing the slave device's power, potentially leading to a situation where the power output of both the master and slave devices cannot meet the corresponding charging requirements.

[0020] Furthermore, the charging controller is also used to control the charging of the power group with the bridge contactor closed when the total power of the power group with the bridge contactor closed does not meet the needs of the device to be charged. During the charging period, it searches for other power groups with unclosed bridge contactors and in an available state in the corresponding charging module according to the set cycle.

[0021] The beneficial effects of the above technical solution are: it can serve as a transitional solution when the output power of the host cannot meet the charging demand, thus avoiding the situation where the charging demand is too high and the charging cannot be completed.

[0022] Furthermore, the charging controller is also used to determine the power demand of the device to be charged and the power of the corresponding power group of each slave device according to a set monitoring cycle during the charging process, so as to monitor the changes in vehicle-side demand and slave device status in real time.

[0023] The beneficial effects of the above technical solution are: it facilitates the timely detection of changes in vehicle-side demand and slave-side status, which can serve as a basis for adjusting the control strategy.

[0024] Furthermore, the method for determining whether each slave device is in a bus-borrowing state is as follows:

[0025] If the DC contactor and bridge contactor corresponding to a slave device are both closed, it is determined that the slave device is in the state of borrowing the bus.

[0026] Furthermore, the method for disconnecting the bridge contactor of the corresponding available power group of the slave device is as follows:

[0027] Disconnect the bridge contactors of the available power groups of each slave unit in sequence, from the slave unit number to the master unit number, in order of increasing proximity. The charger number is determined based on the actual installation location of the charger, and the closer the numbers are, the closer the actual installation locations of the two chargers.

[0028] This invention also provides a control method for a group-controlled charger system. The group-controlled charger system described above is used as follows: the charger that starts charging is designated as the master, and the other chargers in the same charging module as the master are designated as slaves; the output power of the master is detected at certain time intervals; if it is determined that the output power cannot meet the requirements of the device to be charged, and each slave is not in the state of borrowing the bus, then the bridge contactor of the power group corresponding to the master and the bridge contactor of the power group corresponding to each slave that is in the available state are closed.

[0029] The control method of this group-controlled charger system can achieve the same beneficial effects as the group-controlled charger system described above. Attached Figure Description

[0030] Figure 1This is a schematic diagram of the structure of the group control charger system in an embodiment of the present invention;

[0031] Figure 2 This is an example diagram illustrating the charging process of the group-controlled charger system in an embodiment of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0033] Example of a group-controlled charger system

[0034] This embodiment provides a technical solution for a group-controlled charger system; the specific structure is as follows. Figure 1 Including chargers (such as Figure 1 The charging terminal and its corresponding charging module (such as Figure 1 The modules within the dashed boxes are: The charging module contains several power groups to provide the charger's output power; it also includes bridge contactors (i.e., bridge contactors) corresponding to different power groups; see reference... Figure 1 The charger and its corresponding power group in the charging module are used to form a charging circuit with the device to be charged. The bridging contactor is used to connect each power group in the charging module to the DC bus corresponding to the charging module. In this embodiment, the device to be charged is the vehicle to be charged, and the charging terminal can be a vehicle charging pile. In this embodiment, a single charger corresponds to a single power group, that is, there is a one-to-one correspondence between the charger and the power group.

[0035] The group-controlled charger system also includes a charging controller, which is used to designate the charger that starts charging as the master, and the other chargers in the same charging module as the master as slaves. The charging controller is also used to detect the output power of the master at certain time intervals. If it is determined that the output power of the master cannot meet the needs of the device to be charged, and the slaves are not in the state of borrowing the bus, then the bridge contactor of the power group corresponding to the master and the bridge contactor of the power group corresponding to each slave that is in the available state are closed, as follows:

[0036] If it is determined that the output power of the host cannot meet the needs of the device to be charged, a request to borrow the bus is sent through the corresponding communication module of the host. When each slave device receives the request to borrow the bus through its corresponding communication module, it determines whether it is in the state of borrowing the bus. If it is in the state of borrowing the bus, it replies with the first judgment information; otherwise, it replies with the second judgment information.

[0037] If all slave devices respond with the second judgment information, then close the bridge contactor of the power group corresponding to the master device.

[0038] If any slave device responds with the first judgment information, the request to borrow the bus will continue to be sent according to a certain sending cycle until all slave devices corresponding to the sent request to borrow the bus respond with the second judgment information. Then the bridge contactor of the power group corresponding to the master device will be closed.

[0039] After closing the bridge contactor of the power group corresponding to the host, a power borrowing request is sent to other slave devices through the communication module corresponding to the host. If other slave devices receive the power borrowing request through their corresponding communication modules, they determine whether their respective power groups are in an available state. If a power group is found to be in an available state, the host replies with the third judgment information for that power group and closes the bridge contactor of that power group.

[0040] Reference Figure 2 In this embodiment, the first judgment information is a "reject" command, the second judgment information is a "allow" command, and the third judgment information includes a "success" command corresponding to the power group in an available state and the power value of that power group, used to provide borrowed power information so that the charging controller can calculate whether the borrowed power meets the vehicle's needs; in this embodiment, if the power group is in an unavailable state, a fourth judgment information (such as a "failure" command corresponding to the power group) is replied to for that power group, and the bridge contactor of that power group is not closed; the communication modules corresponding to the master and slave communicate through parallel CAN lines; in addition, the The group-controlled charger system also includes a power group connected in series in the charger and the corresponding charging module, and a DC contactor in the charging circuit formed by the device to be charged. The charging controller is also used to determine that the slave device is in a borrowed power state if the bridge contactor of the power group corresponding to the slave device is closed during the charging process, and accordingly keep the DC contactor of the slave device in the open state so that the charging circuit remains open. This can prevent the borrowed slave device from being used for charging operations, which would cause changes in the power output of the master device that is borrowing the power of the slave device, and may result in the power output of both the master device and the slave device being unable to meet the corresponding charging requirements.

[0041] The charging controller is also used to control the charging of the power group with the bridge contactor closed when the total power of the power group with the bridge contactor closed does not meet the needs of the device to be charged. During the charging period, it searches for other power groups with unclosed bridge contactors and available status in the corresponding charging module according to the set cycle. This can serve as a transitional solution when the output power of the host cannot meet the charging demand, and avoid the situation where the charging demand is too high and the charging cannot be completed.

[0042] Furthermore, the charging controller is also used to verify the power group with closed bridge contactors during charging. If the total power of the power group with closed bridge contactors exceeds the demand of the device being charged, the bridge contactors of the corresponding available power groups of the slave devices will be disconnected accordingly. Specifically, the method for disconnecting the bridge contactors of the corresponding available power groups of the slave devices is as follows:

[0043] Following the order of slave and master numbers from farthest to nearest, the bridge contactors of the available power groups corresponding to each slave are disconnected sequentially. The charger number is related to its location, with the charger positions numbered sequentially from left to right. That is, the closer the numbers of two chargers are, the closer their actual installation locations are. Therefore, the order of slave and master numbers from farthest to nearest refers to the distance between the installation locations of the slave and master from farthest to nearest. In other embodiments, other methods can also be used to disconnect the bridge contactors of the available power groups corresponding to each slave sequentially according to the distance between the installation locations of the slave and master, and it is not limited to reflecting the distance of the installation locations through the numbers.

[0044] Therefore, the above method of first controlling the closing of the bridge contactors of the power group corresponding to the master unit and all the available power groups corresponding to the slave units to achieve power borrowing, and then disconnecting the bridge contactors of some slave power groups when it is determined that the borrowed power exceeds the needs of the device to be charged, is equivalent to first borrowing all available power groups uniformly, and then selectively cutting off some power groups according to the charging needs. Therefore, only a simple calculation and control process is needed to achieve the effect of allocating charger output with equivalent power according to the vehicle charging needs, saving control costs to achieve the control effect of output power meeting the needs without power waste.

[0045] In this embodiment, the charging controller is also used to determine the power demand of the device to be charged and the power of the corresponding power group of each slave device according to a set monitoring cycle during the charging process, so as to monitor the changes in vehicle demand and slave device status in real time.

[0046] In summary, referring to Figure 2 The charging process of the group-controlled charger system in this embodiment is exemplified as follows:

[0047] When charging is started, the charging controller takes the charging 1 (i.e., the charging terminal, which is the charging pile equipped with the charging gun) that is started by plugging in the charging gun as the master and can borrow power through the DC bus corresponding to the charging module. The charger that is not plugged in and whose power is borrowed or waiting to borrow power acts as the slave and is used to respond to the master's call.

[0048] During the charging process of the host, the charging controller can close the DC contactor and bridge contactor corresponding to the host. When the slave is borrowed, the charging controller only closes the bridge contactor and keeps the DC contactor in an open state.

[0049] After the main unit enters the charging stage, the charging controller periodically detects the output power; it makes a judgment based on the vehicle's needs. If the main unit's own output power can meet the needs, it will not close the bridge contactor, but will only perform regular charging through its own corresponding power group.

[0050] If the output power of the host cannot meet the requirements, the host's corresponding communication module will immediately send a 1-frame request to borrow the bus to the CAN bus. The communication modules of the other slaves in the same charging module as the host will receive the request through the parallel CAN line. They will first determine whether they are in the state of borrowing the bus. If they are not borrowing the bus, they will reply "allow".

[0051] If a slave device is currently borrowing the bus, the slave device borrowing the bus will reply "Reject";

[0052] If the host that issued the request to borrow the bus receives "allow" responses, then the bridge contactor of the power group corresponding to the host is closed, preparing to borrow power from the power group corresponding to the slave through the bus.

[0053] When the master charger is charging normally, the charging controller controls the DC contactor of the charger to close. Therefore, if the charging controller detects that the DC contactor and bridge contactor of a slave charger are both closed, it determines that the slave charger is in a bus borrowing state. After receiving a bus borrowing request from the CAN bus, it will reply with the first judgment information, namely a "reject" instruction. Note that the master and slave chargers reply and receive messages through their respective communication modules, while the determination of whether they are in a bus borrowing state and the determination of the reply content are performed by the charging controller. In other embodiments, the determination of whether they are in a bus borrowing state and the determination of the reply content can also be performed by the master and slave chargers themselves, which have built-in simple judgment functions. In this embodiment, the charging controller is a controller subsystem composed of controller modules corresponding to each charger. Each controller module processes the corresponding data of its corresponding charger and controls its corresponding charger, thereby simplifying the overall control structure of the charging controller.

[0054] If any slave device receives a "reject" response, the bridge contactor must not be closed. The host device's corresponding communication module will continue to send bus borrowing requests at a certain transmission cycle until all received responses are "allowed." That is, the bridge contactor for the host device's corresponding power group can only be closed after the charger currently borrowing the bus exits. After the bridge contactor for the host device's corresponding power group successfully closes, it begins sending module borrowing requests to other slave devices via its corresponding communication module. Upon receiving the request, the communication modules of other slave devices begin checking the status of their respective power groups. If a power group is available, it replies with "success" and the power value of that power group. Then, the charging controller initiates the closure of the bridge contactor for that power group.

[0055] If the power group is not in an available state, the system will reply "failure" and will not close the bridge contactor. After receiving the replies related to whether the power group is in an available state, the host will perform power verification based on the power value of the power group with the bridge contactor currently closed. If the total power output by the host after power borrowing (i.e. the total power of the power group with the bridge contactor currently closed) exceeds the vehicle's demand, the excess power group will be cut off according to the charger number from far to near. That is, the bridge contactor of the corresponding power group will be disconnected and the cut-off power group will be removed from this power borrowing.

[0056] If the total power does not meet the vehicle's needs, the charging controller will first control the power group with the bridge contactor currently closed to charge. During the charging period, the charging controller will send a borrow power command according to the set cycle to seek a new available power group.

[0057] During the charging process, the charging controller (in this embodiment, the controller module corresponding to the host) periodically calculates the required power and verifies the slave power, responding in real time to changes in vehicle-side demand and slave status.

[0058] Taking a group-controlled charger with a single charger corresponding to a single power group as an example, the group-controlled charger control method in this embodiment is as follows: Figure 2 As shown; Figure 2 In the diagram, each charger represents the control operation of its corresponding power group, with charger 1 as the master. Figure 2 The flowchart below charger 1 shows the control operations performed by the controller module corresponding to the host on the host itself and the corresponding power group; the flowcharts below chargers 2-6 show the control operations performed by the controller modules corresponding to each slave on each slave and the corresponding power group.

[0059] Therefore, in this embodiment, the charging controller can periodically detect the total output power and compare it with the charging demand power in real time. By sending a power borrowing command to borrow power from idle chargers in the group, a wide output power range can be achieved, with the output power reaching 30kW-240kW, to meet the diverse needs of users for fast and slow charging. Furthermore, if the output power exceeds the charging demand power, the borrowed power group will be cut off accordingly, thus avoiding power waste while meeting the charging demand.

[0060] Example of a control method for a group-controlled charger system

[0061] This embodiment provides a technical solution for a control method of a group-controlled charger system. The group-controlled charger system targeted by this control method is the group-controlled charger system described in the above embodiment. Specifically, the control method of this embodiment designates the charger that starts charging as the master, and the other chargers in the same charging module as the master as slaves. The output power of the master is detected at certain time intervals. If it is determined that the output power of the master cannot meet the requirements of the device to be charged, and each slave is not in the state of borrowing the bus, then the bridge contactor of the power group corresponding to the master and the bridge contactor of the power group corresponding to each slave that is in the available state are closed.

[0062] Since the control method of the group-controlled charger system in this embodiment has been described in detail in the above-described group-controlled charger system embodiments, it will not be repeated here.

[0063] This invention has the following characteristics:

[0064] 1) A charging module containing several power groups is set up, and a bridge contactor is used to connect each power group in the charging module to the DC bus corresponding to the charging module. The charging controller distinguishes between the master unit for charging and the slave unit for borrowing power corresponding to the same charging module. By controlling the bridge contactor of the master unit power group and the slave unit available power group to close accordingly, the master unit can borrow power from the slave unit to improve its own output power through the DC bus. There is no need to calculate the power distribution method and issue power output commands according to the distribution method. Therefore, the structure of this group control charger system can simplify the control process of the group control charger system.

[0065] 2) When the output power of the main unit cannot meet the needs of the device to be charged, the charging controller first controls the bridging contactors of the power group corresponding to the main unit and all the available power groups corresponding to the slave units to close, thereby borrowing power. When it is determined that the borrowed power (i.e., the total power of the power groups connected to the bus) exceeds the needs of the device to be charged, the bridging contactors of some slave power groups are then disconnected. This is equivalent to first borrowing all available power groups and then selectively cutting off some power groups according to the charging needs. Therefore, only a simple calculation and control process is needed to achieve the effect of allocating charger output power equivalent to the vehicle's charging needs, saving control costs to achieve the control effect of meeting the needs of the output power without generating power waste.

[0066] 3) During the charging process, if the slave device is in a borrowed power state (i.e., the bridge contactor of the power group corresponding to the slave device is closed), the DC contactor in the charging circuit formed by the power group connected in series with the slave device, the corresponding charging module, and the device to be charged will be kept in the open state, so that the charging circuit of the slave device remains open. This can prevent the borrowed slave device from being used for charging operations, which would cause changes in the power output of the master device that is borrowing the power of the slave device, and may result in the power output of both the master device and the slave device being unable to meet the corresponding charging requirements.

[0067] 4) If the output power of the host (i.e. the total power of the power group with the bridge contactor closed) after power borrowing is still insufficient to meet the needs of the device to be charged, then charging will start first. During the charging process, the host will continue to search for other power groups with unclosed bridge contactors that are available in the corresponding charging module. This can serve as a transitional solution when the output power of the host cannot meet the charging needs, thus avoiding the situation where the charging demand is too high and charging cannot be achieved directly.

[0068] It should be understood that the above-described specific embodiments of the present invention are merely illustrative or explanatory of the principles of the present invention, and do not constitute a limitation thereof.

Claims

1. A group-controlled charger system, characterized in that, It includes a charger and its corresponding charging module; the charging module contains several power groups for providing the output power of the charger; it also includes a bridge contactor for the corresponding power group; the power groups in the charger and its corresponding charging module are used to form a charging circuit with the device to be charged, and the bridge contactor is used to connect each power group in the charging module to the DC bus corresponding to the charging module. It also includes a charging controller, which is used to designate the charger that starts charging as the master and the other chargers in the same charging module as the master as slaves; it detects the output power of the master at certain time intervals. If it is determined that the output power cannot meet the requirements of the device to be charged and all slaves are not in the state of borrowing the bus, then it closes the bridge contactor of the power group corresponding to the master and the bridge contactor of the power group corresponding to each slave that is in the available state. It also includes the DC contactor in the charging circuit formed by the power group connected in series in the charger and the corresponding charging module and the device to be charged; the method to determine whether each slave device is in the state of borrowing the bus is: if the DC contactor and the bridge contactor corresponding to a slave device are both in the closed state, then the slave device is determined to be in the state of borrowing the bus.

2. The group-controlled charger system according to claim 1, characterized in that, The charging controller is also used to verify the power group with the bridge contactor closed. If the total power of the power group exceeds the needs of the device to be charged, the bridge contactor of the corresponding slave device in the available power group will be disconnected.

3. The group-controlled charger system according to claim 1 or 2, characterized in that, If it is determined that the output power of the host device itself cannot meet the requirements of the device being charged, and none of the slave devices are in a state of borrowing the bus, then the methods for closing the bridge contactor of the power group corresponding to the host device and the bridge contactor of the power group corresponding to each slave device that is in an available state include: If it is determined that the output power of the host cannot meet the needs of the device to be charged, a request to borrow the bus is sent through the corresponding communication module of the host. When each slave device receives the request through its corresponding communication module, it determines whether it is in the state of borrowing the bus. If it is in the state of borrowing the bus, it replies with the first judgment information; otherwise, it replies with the second judgment information. If all slave devices respond with the second judgment information, then close the bridge contactor of the power group corresponding to the master device. If any slave device responds with the first judgment information, the request to borrow the bus will continue to be sent according to a certain sending cycle until all slave devices corresponding to the sent request to borrow the bus respond with the second judgment information. Then the bridge contactor of the power group corresponding to the master device will be closed.

4. The group-controlled charger system according to claim 3, characterized in that, If it is determined that the output power of the host device itself cannot meet the requirements of the device being charged, and none of the slave devices are in a state of borrowing the bus, then the methods for closing the bridge contactor of the power group corresponding to the host device and the bridge contactor of the power group corresponding to each slave device that is in an available state also include: After closing the bridge contactor of the power group corresponding to the host, a power borrowing request is sent to other slave devices through the communication module corresponding to the host. If other slave devices receive the request through their corresponding communication modules, they determine whether their respective power groups are in an available state. If a power group is found to be in an available state, the host replies with the third judgment information and closes the bridge contactor of that power group.

5. The group-controlled charger system according to claim 1 or 2, characterized in that, The charging controller is also used to determine that the slave device is in a borrowed power state if the bridge contactor of the power group corresponding to the slave device is closed during the charging process, and accordingly keep the DC contactor of the slave device in the open state so that the charging circuit remains open.

6. The group-controlled charger system according to claim 1 or 2, characterized in that, The charging controller is also used to control the charging of the power group with the bridge contactor closed when the total power of the power group with the bridge contactor closed does not meet the needs of the device to be charged. During the charging period, it searches for other power groups with unclosed bridge contactors and available status in the corresponding charging module according to the set cycle.

7. The group-controlled charger system according to claim 1 or 2, characterized in that, The charging controller is also used to determine the power demand of the device to be charged and the power of each slave device's corresponding power group according to a set monitoring cycle during the charging process, so as to monitor changes in vehicle-side demand and slave device status in real time.

8. The group-controlled charger system according to claim 3, characterized in that, The first judgment information is a "deny" instruction, and the second judgment information is a "allow" instruction.

9. The group-controlled charger system according to claim 1 or 2, characterized in that, The method for disconnecting the bridge contactor of the corresponding available power group of the slave device is as follows: Disconnect the bridge contactors of the available power groups of each slave unit in sequence, from the slave unit number to the master unit number, in order of increasing proximity. The charger number is determined based on the actual installation location of the charger, and the closer the numbers are, the closer the actual installation locations of the two chargers.

10. A control method for a group-controlled charger system, characterized in that, The control method is for a group-controlled charger system; the charger that starts charging is set as the master, and the other chargers in the same charging module as the master are set as slaves; the output power of the master is detected at a certain time interval; if it is determined that the output power cannot meet the needs of the device to be charged, and each slave is not in the state of borrowing the bus, then the bridge contactor of the power group corresponding to the master and the bridge contactor of the power group corresponding to each slave in the available state are closed. The group-controlled charger system includes a charger and its corresponding charging module; The charging module includes several power groups for providing the output power of the charger; it also includes a bridge contactor for each power group; the charger and the power groups in the corresponding charging module are used to form a charging circuit with the device to be charged, and the bridge contactor is used to connect each power group in the charging module to the DC bus corresponding to the charging module. It also includes a charging controller, which is used to designate the charger that starts charging as the master and the other chargers in the same charging module as the master as slaves; it detects the output power of the master at certain time intervals. If it is determined that the output power cannot meet the requirements of the device to be charged and all slaves are not in the state of borrowing the bus, then it closes the bridge contactor of the power group corresponding to the master and the bridge contactor of the power group corresponding to each slave that is in the available state. It also includes the DC contactor in the charging circuit formed by the power group connected in series in the charger and the corresponding charging module and the device to be charged; the method to determine whether each slave device is in the state of borrowing the bus is: if the DC contactor and the bridge contactor corresponding to a slave device are both in the closed state, then the slave device is determined to be in the state of borrowing the bus.

11. The control method for the group-controlled charger system according to claim 10, characterized in that, The charging controller is also used to verify the power group with the bridge contactor closed. If the total power of the power group exceeds the needs of the device to be charged, the bridge contactor of the corresponding slave device in the available power group will be disconnected.

12. The control method for the group-controlled charger system according to claim 10 or 11, characterized in that, If it is determined that the output power of the host device itself cannot meet the requirements of the device being charged, and none of the slave devices are in a state of borrowing the bus, then the methods for closing the bridge contactor of the power group corresponding to the host device and the bridge contactor of the power group corresponding to each slave device that is in an available state include: If it is determined that the output power of the host cannot meet the needs of the device to be charged, a request to borrow the bus is sent through the corresponding communication module of the host. When each slave device receives the request through its corresponding communication module, it determines whether it is in the state of borrowing the bus. If it is in the state of borrowing the bus, it replies with the first judgment information; otherwise, it replies with the second judgment information. If all slave devices respond with the second judgment information, then close the bridge contactor of the power group corresponding to the master device. If any slave device responds with the first judgment information, the request to borrow the bus will continue to be sent according to a certain sending cycle until all slave devices corresponding to the sent request to borrow the bus respond with the second judgment information. Then the bridge contactor of the power group corresponding to the master device will be closed.

13. The control method for the group-controlled charger system according to claim 12, characterized in that, If it is determined that the output power of the host device itself cannot meet the requirements of the device being charged, and none of the slave devices are in a state of borrowing the bus, then the methods for closing the bridge contactor of the power group corresponding to the host device and the bridge contactor of the power group corresponding to each slave device that is in an available state also include: After closing the bridge contactor of the power group corresponding to the host, a power borrowing request is sent to other slave devices through the communication module corresponding to the host. If other slave devices receive the request through their corresponding communication modules, they determine whether their respective power groups are in an available state. If a power group is found to be in an available state, the host replies with the third judgment information and closes the bridge contactor of that power group.

14. The control method for the group-controlled charger system according to claim 10 or 11, characterized in that, The charging controller is also used to determine that the slave device is in a borrowed power state if the bridge contactor of the power group corresponding to the slave device is closed during the charging process, and accordingly keep the DC contactor of the slave device in the open state so that the charging circuit remains open.

15. The control method for the group-controlled charger system according to claim 10 or 11, characterized in that, The charging controller is also used to control the charging of the power group with the bridge contactor closed when the total power of the power group with the bridge contactor closed does not meet the needs of the device to be charged. During the charging period, it searches for other power groups with unclosed bridge contactors and available status in the corresponding charging module according to the set cycle.

16. The control method for the group-controlled charger system according to claim 10 or 11, characterized in that, The charging controller is also used to determine the power demand of the device to be charged and the power of each slave device's corresponding power group according to a set monitoring cycle during the charging process, so as to monitor changes in vehicle-side demand and slave device status in real time.

17. The control method for the group-controlled charger system according to claim 12, characterized in that, The first judgment information is a "deny" instruction, and the second judgment information is a "allow" instruction.

18. The control method for the group-controlled charger system according to claim 10 or 11, characterized in that, The method for disconnecting the bridge contactor of the corresponding available power group of the slave device is as follows: Disconnect the bridge contactors of the available power groups of each slave unit in sequence, from the slave unit number to the master unit number, in order of increasing proximity. The charger number is determined based on the actual installation location of the charger, and the closer the numbers are, the closer the actual installation locations of the two chargers.

Images