CN110768815A

CN110768815A - Method for switching signal line and solar energy system

Info

Publication number: CN110768815A
Application number: CN201810843838.5A
Authority: CN
Inventors: 姜宪明
Original assignee: Hanergy Mobile Energy Holdings Group Co Ltd
Current assignee: Dongjun New Energy Co ltd
Priority date: 2018-07-27
Filing date: 2018-07-27
Publication date: 2020-02-07
Anticipated expiration: 2038-07-27
Also published as: CN110768815B

Abstract

The invention discloses a method for switching signal lines and a solar system, wherein a plurality of junction boxes which correspond to solar components one by one are preset, the junction boxes are sequentially connected in series through the signal lines, and the plurality of the junction boxes after being connected in series are connected with a controller in series to form a loop, and the method comprises the following steps: the controller receives and analyzes the data information uploaded by the junction boxes, judges whether the data information of all the junction boxes in the loop is received or not, if not, the input end and the output end of the controller are switched, and the input end after switching receives the missing data information. After the communication cable has a fault, the invention receives the data information of all the junction boxes on two sides of the fault point through the input end and the output end of the switching controller, thereby realizing the communication during the fault. Therefore, the embodiment of the invention can solve the problem that communication cannot be carried out due to the fault of the communication cable, and can ensure that the communication cable can also communicate with each junction box after the fault of the communication cable occurs, thereby receiving the communication data of each junction box.

Description

Method for switching signal line and solar energy system

Technical Field

The invention relates to the technical field of photovoltaic modules, in particular to a method for switching signal lines and a solar system.

Background

For switching of communication signal ports, a common practice of those skilled in the art is to use a bidirectional controllable switch to realize signal port selection, for example, two-open and two-close relays are used to respectively guide input and output of the communication signal ports to different ports, and switching of input and output of communication signals between two different ports can be realized by controlling the closing and conduction of the relays.

Disclosure of Invention

In view of the above, the present invention provides a method for switching signal lines and a solar energy system, so as to solve the technical problems in the prior art.

According to a first aspect of the present invention, there is provided a method for switching signal lines, wherein a plurality of junction boxes corresponding to solar modules one to one are preset, the plurality of junction boxes are sequentially connected in series through the signal lines, and the plurality of connected junction boxes are connected in series with a controller to form a loop, the method comprising:

the controller receives and analyzes the data information uploaded by the junction boxes, judges whether the data information of all the junction boxes in the loop is received or not, if not, the input end and the output end of the controller are switched, and the input end after switching receives the missing data information.

In some embodiments of the present invention, switching the input and the output of the controller, and receiving the missing data information through the switched input includes:

the controller sends a port switching command to the junction box in the loop through a signal output line connected with the output end of the controller, so that the junction box receiving the port switching command switches a receiving end and a sending end of the junction box;

the controller switches the input end and the output end of the controller;

and the controller receives the data information uploaded by the junction boxes of the receiving end and the sending end of the controller through the switched input end.

the controller sends a data acquisition command and a port switching command to the junction box in the loop through a signal output line connected with the output end of the controller, so that the junction box receiving the port switching command switches the receiving end and the sending end of the junction box;

the controller switches the input end and the output end of the controller;

and the controller receives data information returned by the junction boxes of the receiving end and the sending end of the controller in response to the data acquisition command through the switched input end.

In some embodiments of the present invention, the data information includes an encoded number of the junction box, and the method further includes:

the controller judges whether the data information of all the junction boxes is acquired or not according to the code number in the received data information;

if not, determining a fault point in the loop according to the missing code number;

and carrying out fault alarm according to the determined fault point.

According to a second aspect of the present invention, there is provided a method for switching signal lines, wherein a plurality of junction boxes corresponding to solar modules one to one are preset, the plurality of junction boxes are sequentially connected in series through the signal lines, and the plurality of connected junction boxes are connected in series with a controller to form a loop, the method comprising:

the junction box receives a port switching command sent by the controller when judging that the data information of all junction boxes in the loop is not received;

the junction box switches a receiving end and a sending end of the junction box;

and the junction box sends the data information acquired by the junction box to the switched input end of the controller through the switched sending end.

In some embodiments of the present invention, the terminal box sends its own data information to the switched input end of the controller through the switched sending end, including:

the junction box actively or in response to a data acquisition command issued by the controller transmits the data information acquired by the junction box to the junction box with the smallest code number and/or the junction box with the largest code number;

and the terminal box with the minimum code number and/or the terminal box with the maximum code number uploads the collected data information to the input end switched by the controller.

In some embodiments of the invention, the method further comprises:

if the controller and the junction box are not communicated within the preset time threshold, the junction box actively transmits the data information of the junction box to the controller through a signal line and the junction box in a loop in sequence.

According to a third aspect of the invention, a solar energy system is provided, which comprises a plurality of junction boxes corresponding to solar energy components one by one, wherein the junction boxes are sequentially connected in series through signal lines, and the plurality of serially connected junction boxes are connected with a controller in series to form a loop; the controller comprises a switching unit, the controller is coupled with the signal line through the switching unit, each junction box comprises a signal input and output unit and a switching unit, and the junction boxes are coupled with the signal line through the switching units.

In some embodiments of the present invention, the switching unit includes a plurality of multiplexing units connected in parallel through a control signal line, and the plurality of multiplexing units connected in parallel are connected in series with the signal input-output unit through the control signal line.

In some embodiments of the present invention, the switching unit includes a plurality of bus transceivers connected in parallel through a control signal line, the plurality of bus transceivers connected in parallel being connected in series with the signal input output unit through the control signal line, and an inverter connected in series between one of the bus transceivers and the signal input output unit.

In some embodiments of the present invention, the switching unit further includes a plurality of tri-state data buffers and an inverter, the plurality of tri-state data buffers are divided into two groups, wherein control pins of one group of tri-state data buffers are all connected to the control signal line, control pins of the other group of tri-state data buffers are connected to an output terminal of the inverter, and an input terminal of the inverter is connected to the control signal line;

the input end of one tri-state data buffer in one group of tri-state data buffers is connected with the receiving end of the first bus transceiver, the output end of the tri-state data buffer is connected with the input pin of the signal input and output unit, the input end of the other tri-state data buffer is connected with the output pin of the signal input and output unit, and the output end of the tri-state data buffer is connected with the transmitting end of the second bus transceiver; the input end of one tri-state data buffer in the other set of tri-state data buffers is connected with the receiving end of the second bus transceiver, the output end of the tri-state data buffer is connected with the input pin of the signal input and output unit, the input end of the other tri-state data buffer is connected with the output pin of the signal input and output unit, and the output end of the tri-state data buffer is connected with the transmitting end of the first bus transceiver.

After the communication cable has a fault, the embodiment of the invention receives the data information of all the junction boxes on two sides of the fault point through the input end and the output end of the switching controller, thereby realizing the communication during the fault. Therefore, the embodiment of the invention can solve the problem that communication cannot be carried out due to the fault of the communication cable, and can ensure that the communication cable can also communicate with each junction box after the fault of the communication cable occurs, thereby receiving the communication data of each junction box. In addition, the embodiment of the invention adopts the switching unit to switch the input end and the output end of the controller, thereby solving the problems of higher cost, higher power consumption and unsuitability for transmitting digital communication signals of the bidirectional controlled switch.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a solar energy system according to an embodiment of the present invention;

FIG. 2 is a flow chart of a method for switching signal lines according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a signal input/output unit and a switching unit according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a solar energy system according to another embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a solar energy system according to yet another embodiment of the present invention;

FIG. 6 is a schematic diagram of a signal input/output unit and a switching unit according to still another embodiment of the present invention;

fig. 7 is a schematic structural diagram of a signal input/output unit and a switching unit according to another embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

At least one embodiment of the present invention provides a method for switching signal lines, in which a plurality of terminal boxes corresponding to solar modules one to one are preset, the plurality of terminal boxes are sequentially connected in series through signal lines, and the plurality of terminal boxes connected in series are connected in series with a controller to form a loop, the method including: the controller receives and analyzes the data information uploaded by the junction boxes, judges whether the data information of all the junction boxes in the loop is received or not, if not, the input end and the output end of the controller are switched, and the input end after switching receives the missing data information. And the controller sends a port switching command to the junction boxes in the loop through the output end when judging that the data information of all the junction boxes in the loop is not received. The junction box in the loop receives the port switching command and switches the receiving end and the sending end of the junction box; and the junction box sends the data information acquired by the junction box to the switched input end of the controller through the switched sending end.

Fig. 1 is a schematic structural diagram of a solar energy system according to an embodiment of the present invention. In this embodiment, the system includes a controller 1 and a plurality of terminal boxes 7, 8, 9, 10 corresponding to the solar modules one by one, the plurality of terminal boxes 7, 8, 9, 10 are connected in series in sequence through a signal line 11, the plurality of terminal boxes 7, 8, 9, 10 connected in series are connected in series with the controller 1 to form a loop, and the plurality of terminal boxes are divided into a plurality of terminal box groups (the terminal boxes 7, 8 are in a group, the terminal boxes 9, 10 are in a group) connected in parallel through power lines or one terminal box group (the terminal boxes 7, 8, 9, 10 are in a group) connected in series through power lines. It can be seen that the solar modules can be formed into an orderly and mutually-associated whole through the signal wires 11. Because the communication ground wire can be connected to the ground through the device housings such as the junction box to realize the common-ground relationship in some applications, the default common-ground relationship exists in fig. 1, fig. 2 and the subsequent related schematic diagrams, which is not shown in the drawings in detail, and if the communication ground wire common-ground relationship cannot be formed through the device housings such as the junction box in the applications, only one common-ground wire needs to be supplemented in the schematic diagrams. If there is more than one set of junction boxes shown in fig. 1, each set of junction boxes does not represent junction boxes associated with only two solar modules, each set of junction boxes may include 1 to N junction boxes arbitrarily unequal, and N may be 2, 3, 4, 5, 8, 10, 100, 1000, 10000, and the like, which is not limited in this embodiment of the present invention. If a group of junction boxes is shown in fig. 1, the group of junction boxes may include 1 to N junction boxes that are not equal, where N may be 2, 3, 4, 5, 8, 10, 100, 1000, 10000, and the like, and the embodiment of the present invention is not limited thereto. It is noted that the controller 1 has an encoding function and a communication function.

In another embodiment, the signal line 11 as a communication cable may be only a general cable, the first signal line and the second signal line may be general communication cables, it is not necessary to distinguish a communication input line and a communication output line, and communication is to customize communication contents by using signals of 0, 1, etc. and signals in time series of 0, 1.

In the embodiment of the present invention, the controller 1 sends a communication signal through the sending end 102, the communication signal can only be received by the first junction box 2in the loop (using the receiving end 702 of the first junction box 7 in the loop), the first junction box 2in the loop parses information in the communication signal, uses the information to complete a corresponding function, and sends the received useful information or information that needs to be transmitted to the receiving end 802 of the next junction box 8 connected in series with the first junction box through the sending end 701, the junction box 8 parses information in the signal transmitted from the receiving end 802 to complete a corresponding function until all the junction boxes receive the communication signal, and complete a communication cycle, and if necessary, the last junction box that completes communication sends the collected useful information or information that needs to be transmitted to the receiving end 101 of the controller 1 through the signal sending end thereof.

In the whole communication process, all the communication function modules including the controller and the junction box only communicate with the adjacent communication function modules, the relative communication distance is very short, and the communication function modules can be ensured to communicate at the highest allowable communication speed. The communication function module refers to a full-duplex or half-duplex communication unit circuit with a communication function in a controller or a junction box, such as a full-duplex bus transceiver (such as RS232, RS422 and the like) or a half-duplex bus transceiver (such as RS485 and the like).

It should be noted that, for convenience of describing the implementation of the present invention, 102 is designated as the sending end of the controller 1, and 101 is designated as the receiving end of the controller 1. This designation is for descriptive convenience only and does not mean that the actual deployment and implementation are necessarily implemented in this manner, and the actual implementation may be implemented by setting 101 as the sending end of the controller 1 and setting 102 as the receiving end of the controller 1. Similarly, the receiving end and the sending end of the junction box are not fixed, and can be deployed according to actual conditions. According to the actual application requirements, 702, 802, 902 and 1002 can be deployed as receiving ends, 701, 801, 901 and 1001 as transmitting ends; it is also possible to deploy 702, 802, 902, 1002 as the transmitting end and 701, 801, 901, 1001 as the receiving end.

It should be noted that, in the embodiment of the present invention, the junction box refers to a device corresponding to the solar modules and used for connecting the solar modules, and the inside of the junction box may have a unique factory identification code. The solar component comprises a solar component with an intelligent junction box and a solar component with an external intelligent junction box, so that the solar component junction box in the embodiment of the invention can be a junction box in the solar component with the intelligent junction box and can also be a junction box of the solar component with the external intelligent junction box. That is, the marks 7, 8, 9, and 10 shown in fig. 1 may represent both a solar module with an internal junction box and an external junction box of the solar module.

As an embodiment of the present invention, as shown in fig. 2, the method includes:

step 201, if the controller and the junction box are not communicated within a preset time threshold, the junction box actively transmits data information of the junction box to the controller through a signal line and the junction box in a loop in sequence;

and 202, the controller receives and analyzes the data information uploaded by the junction boxes, judges whether the data information of all the junction boxes in the loop is received, and receives the missing data information in a mode of switching the input end and the output end of the controller if the data information of all the junction boxes in the loop is not received.

In order to avoid communication failure caused by communication cable failure, for example, communication failure occurs when the communication cable is disconnected, the controller 1 and all the junction boxes preset the longest allowed time T (i.e., preset time threshold T) for non-communication (no communication command is received or communication data transmission is not completed), when the junction boxes do not communicate beyond the time T, all the junction boxes try to actively upload data information acquired by themselves to a next junction box in a loop, and the next junction box loads information acquired by the junction box into the data information transmitted by the previous junction box and then continuously uploads the information until all the junction boxes after a disconnection point can automatically upload the information, and communication links of all the junction boxes after the disconnection point are opened. The data information may be identification codes, code numbers, component operating voltages, currents, powers, temperatures, component or terminal block states, fault information, other necessary information related to the component or terminal block, and the like. If 102 is taken as the output end of the controller 1 and 101 is taken as the input end of the controller 1, when a disconnection point occurs between the junction boxes 8 and 9, the junction box 9 and all junction boxes behind the junction box can realize communication when the communication cable fails by actively uploading data. In this process, the controller 1 parses the uploaded data information to clearly know where the communication failure occurred.

In this embodiment, the controller 1 can determine which code number data information is less by analyzing the data information sent by the last junction box, thereby determining the location of the failed junction box. Therefore, any communication problem can be quickly identified and located in the whole communication loop. Then, the input terminal and the output terminal of the controller 1 are switched, after the switching, 102 is the input terminal of the controller 1, 101 is the output terminal of the controller 1, and the data information of the terminal box 8 and all the previous terminal boxes is received through the receiving terminal 102.

It should be noted that, in the embodiment of the present invention, the coding of the solar modules corresponding to each junction box is completed, and the coding is performed sequentially according to the sequence of coding numbers from small to large, before the input end and the output end are switched, the coding number of the solar module corresponding to the junction box directly connected to the output end 102 is the smallest, and the coding number of the solar module corresponding to the junction box directly connected to the input end 101 is the largest. After the input end and the output end are switched, the code number of the solar component corresponding to each junction box is not changed.

In another embodiment of the present invention, receiving data information of the terminal block located at the side of the fault point by switching the input terminal and the output terminal of the controller includes: the controller sends a port switching command to a junction box in the loop through a signal output line connected with the output end of the controller; switching an input end and an output end of the controller; and the junction box receiving the port switching command transmits the port switching command to the next adjacent junction box, switches the receiving end and the transmitting end of the junction box, and uploads the data information acquired by the junction box to the controller.

If the controller 1 does not receive complete data information with codes (for example, component data from code number 00 to number XX), it can automatically determine which junction box has a communication fault, at this time, the controller 1 sends a port switching command to the junction boxes by using the signal output lines connected to the output terminal 102, and the port switching command is sequentially received from the first junction box connected to the signal output lines of the controller 1 until the junction boxes with disconnected communication cables, such as the junction boxes 7 and 8, and the port switching process is sequentially completed. Then, after sending the port switching command, the input terminal and the output terminal of the controller 1 are switched, and after the switching, 102 is the input terminal of the controller 1, and 101 is the output terminal of the controller 1, and the receiving end 102 waits for receiving the data information of the terminal box 8 and all the terminal boxes before the terminal box 8. After the exchange process is finished, all the junction boxes exchanged at the sending end and the receiving end automatically upload the data information acquired by the junction boxes, and upload the data information to the controller 1 after the data information of all the solar assemblies is collected by a first junction box (the junction box with the smallest code number, namely the junction box which directly receives the communication signal of the controller originally, and each junction box can judge whether the junction box is the first junction box according to the size of the code number).

As shown in fig. 1, the input terminal of the controller 1 is switched between 101 and 102 in time to receive data information of two groups of solar modules after communication failure, and in order to cooperate with data reception of the controller 1, the first junction box and the last junction box may select to upload the same data information multiple times to ensure that the data is completely received by the controller 1.

Optionally, the junction box of the switching receiving end and the switching transmitting end transmits the data information acquired by the junction box to the junction box with the largest code number or the junction box with the smallest code number; and the junction box with the largest code number or the junction box with the smallest code number uploads the collected data information to the controller. Therefore, the terminal box with the smallest code number and the terminal box with the largest code number can also wait for receiving the complete terminal box data information and then update the data information and transmit the data information to the controller 1, and before updating the data information, the terminal box with the smallest code number and the terminal box with the largest code number can select to upload the received complete terminal box data information for multiple times.

In another embodiment of the present invention, switching the input and the output of the controller, and receiving the missing data information through the switched input includes: the controller sends a data acquisition command and a port switching command to the junction box in the loop through a signal output line connected with the output end of the controller, so that the junction box receiving the port switching command switches the receiving end and the sending end of the junction box; the controller switches the input end and the output end of the controller; and the controller receives data information returned by the junction boxes of the receiving end and the sending end of the controller in response to the data acquisition command through the switched input end. The terminal box sends the data information of self to the input that the controller switched through the sending terminal after switching, include: the junction box responds to a data acquisition command issued by the controller to transmit data information acquired by the junction box to the junction box with the smallest code number and/or the junction box with the largest code number; and the terminal box with the minimum code number and/or the terminal box with the maximum code number uploads the collected data information to the input end switched by the controller.

It should be noted that the data acquisition command and the port switching command may be sent to the terminal block in the loop at the same time, or the data acquisition command may be sent first, and then the port switching command may be sent, both of which are within the protection scope of the present invention. In this embodiment, it is ensured that the terminal block has already sent the data acquisition command and the port switching command to the next terminal block adjacent thereto before switching its receiving end and sending end.

In another embodiment of the present invention, a data acquisition command is sent first, and then a port switching command is sent as an example for description. Receiving data information of the junction box on the side of the fault point by switching an input end and an output end of the controller, wherein the data information comprises: the controller sends a data acquisition command to a junction box in the loop through a signal output line connected with the output end of the controller; a junction box in the loop receives the data acquisition command; the controller sends a port switching command to a junction box in the loop through a signal output line connected with the output end of the controller; switching an input end and an output end of the controller; and the terminal box receiving the port switching command switches the input end and the output end of the terminal box and actively uploads the data information acquired by the terminal box to the controller.

In another embodiment of the present invention, switching the input and the output of the controller, and receiving the missing data information through the switched input includes: the controller sends a port switching command to the junction box in the loop through a signal output line connected with the output end of the controller, so that the junction box receiving the port switching command switches a receiving end and a sending end of the junction box; the controller switches the input end and the output end of the controller; and the controller receives the data information uploaded by the junction boxes of the receiving end and the sending end of the controller through the switched input end. The junction box actively transmits the data information acquired by the junction box to the junction box with the smallest code number and/or the junction box with the largest code number; and the terminal box with the minimum code number and/or the terminal box with the maximum code number uploads the collected data information to the input end switched by the controller.

Optionally, the data information includes an encoding number of the junction box, and the method further includes: the controller judges whether the data information of all the junction boxes is acquired or not according to the code number in the received data information; if not, determining a fault point in the loop according to the missing code number; and carrying out fault alarm according to the determined fault point.

In the embodiment, the junction box actively transmits the data information acquired by the junction box to the junction box with the smallest code number and/or the junction box with the largest code number; and the terminal box with the minimum code number and/or the terminal box with the maximum code number uploads the collected data information to the input end switched by the controller. The implementation mode is as follows:

if 102 is taken as the output end of the controller 1 and 101 is taken as the input end of the controller 1, when a disconnection point occurs between the junction boxes 8 and 9, the junction box 9 and all junction boxes behind the junction box can realize communication when the communication cable fails by actively uploading data. In this process, the controller 1 parses the uploaded data information to clearly know where the communication failure occurred.

The controller 1 sends a data acquisition command to the junction box in the loop via a signal output line connected to its output 102. Due to the communication link being broken, only the junction box 8 and all junction boxes preceding it receive the data acquisition command. The controller 1 then sends a port switch command to the terminal block in the loop via the signal output line connected to its output 102. Since the communication link is disconnected, only the terminal block 8 and all the terminal blocks before the terminal block receive the port switching command, and the terminal blocks from the first terminal block connected to the signal output line of the controller 1 to the terminal block where the communication cable is disconnected, such as the terminal blocks 7 and 8, receive the port switching command in sequence and complete the port switching process in sequence. In order to receive the missing data information, after sending a port switching command, switching the input end and the output end of the controller 1, after switching, 102 is the input end of the controller 1, 101 is the output end of the controller 1, and waiting for receiving the data information of the terminal box 8 and all the previous terminal boxes through the receiving end 102. After the exchange process is finished, all the junction boxes exchanged at the sending end and the receiving end automatically upload the data information acquired by the junction boxes, and upload the data information to the controller 1 after the data information of all the solar assemblies is collected by a first junction box (the junction box with the smallest code number, namely the junction box which directly receives the communication signal of the controller originally, and each junction box can judge whether the junction box is the first junction box according to the size of the code number). After the terminal box with the exchanged sending end and receiving end sends the acquired data, the sending end and receiving end are exchanged back again to ensure that the data acquisition command and the port switching command from the controller 1 can be received next time.

Each junction box collects data information of itself, and transmits the data information of each junction box to the junction box with the smallest code number (namely, the junction box directly connected with the input end 102 of the controller 1) through the signal line and the junction box in the loop, the junction box with the smallest code number uploads the collected data information to the controller 1, and the controller 1 receives the data information and judges whether the data information of all the junction boxes is received or not.

After the communication cable has a fault, the embodiment of the invention receives the data information of all the junction boxes on two sides of the fault point through the input end and the output end of the switching controller, thereby realizing the communication during the fault. Therefore, the embodiment of the invention can solve the problem that communication cannot be carried out due to the fault of the communication cable, and can ensure that the communication cable can also communicate with each junction box after the fault of the communication cable occurs, thereby receiving the communication data of each junction box.

It should be noted that, under the condition that the present invention can be realized, the order of the above steps can be adjusted according to needs, and the adjusted technical solutions are all within the protection scope of the present invention.

Similarly, the controller may send the data acquisition command and the port switching command to the junction box in the loop at the same time, that is, the controller sends the data acquisition command and the port switching command to the junction box in the loop at the same time through the signal output line connected to the output end of the controller; a junction box in the loop receives the data acquisition command and the port switching command; switching an input end and an output end of the controller; the junction box receiving the data acquisition command and the port switching command switches the input end and the output end of the junction box first, and then uploads the data information acquired by the junction box to the controller.

In a further embodiment of the present invention, when a communication link is disconnected due to a failure, for example, after the junction boxes 8 and 9 are disconnected, the data of the junction boxes of each component can be received in a master-slave manner, which is implemented as follows:

for example, when a disconnection point occurs between the terminal blocks 8 and 9, the terminal block 8 and all the terminal blocks before the terminal block can receive a data acquisition command from the controller 1, the data acquisition command comprises the code number of the terminal box with the largest code number or the code numbers of the terminal boxes with the largest code number and the smallest code number in all the terminal boxes in the string, after the data acquisition command is sent, switching 102 to input end, waiting for receiving data, all the terminal boxes receiving data acquisition command forwarding the data acquisition command to the next terminal box, and after the data acquisition command is transmitted, the transmitting end and the receiving end of the terminal box are exchanged to transmit the acquired data and the data transmitted by the previous terminal box to the port direction of the controller 1, the terminal box with the largest code number in the string sends out the acquired data, and then exchanges the sending end and the receiving end again to prepare for the next round of data acquisition. And checking whether all the terminal box data information from the terminal box to the terminal box with the largest code number is obtained or not by the non-largest code number terminal box, if so, sending the data information, then exchanging the sending end and the receiving end of the terminal box again to prepare for the next round of data acquisition, and if not, waiting until all the terminal box data information from the terminal box code number to the terminal box code number with the largest code number is obtained and sent, and then exchanging the sending end and the receiving end of the terminal box (or exchanging the sending end and the receiving end of the terminal box after a preset time threshold value is exceeded). And by analogy, after the terminal box with the smallest code number obtains and uploads the data information of all the terminal boxes of the string and exchanges the sending end and the receiving end of the terminal box, all the terminal boxes of the string are changed into a state capable of receiving the data acquisition command of the controller 1 again, and a complete active data acquisition process at one side of the fault point is completed.

For example, when a disconnection point occurs between the junction boxes 8 and 9, the junction box 9 and all junction boxes behind the junction box 9 can also realize communication between the junction boxes 9 and 10 when a communication cable fails in a master-slave communication mode, and the specific principle is as follows: when a breakpoint occurs between the terminal boxes 8 and 9, the terminal boxes 9 and 10 cannot receive data information of the terminal boxes before the terminal boxes 9 and 10 within a preset time threshold T1, then automatically switch the sending ports and the receiving ports thereof, so that the original sending port is changed into the receiving port, the original receiving port is changed into the sending port, the terminal boxes 9 and 10 after the port switching can receive a command sent by the controller 1, in cooperation therewith, the controller 1 also changes 101 into an output port to send a data acquisition command, the data acquisition command includes the minimum code number or the minimum code number and the maximum code number in all the terminal boxes in the string, after the data acquisition command of the controller 1 is sent, changes 101 into the receiving port again to wait for receiving data, all the terminal boxes receiving the data acquisition command forward the data acquisition command to the next terminal box, and after the data acquisition command is forwarded, interchanging the transmitting end and the receiving end of the junction box again to transmit the acquired data and the data transmitted by the previous junction box to the port direction of the controller 1, after the junction box with the minimum code number in the string transmits the acquired data, interchanging the transmitting end and the receiving end again to prepare the next round of data acquisition, checking whether all the junction box data information from the minimum code number to the code number is obtained by the junction box with the non-minimum code number, if so, interchanging the transmitting end and the receiving end of the junction box again to prepare the next round of data acquisition, and if not, waiting until all the junction box data information from the minimum code number to the code number is obtained and the data are transmitted, interchanging the transmitting end and the receiving end of the junction box (or interchanging the transmitting end and the receiving end of the junction box after exceeding a preset time threshold T2), by analogy, after the terminal box with the largest code number obtains and uploads the data information of all the terminal boxes of the string and exchanges the sending end and the receiving end of the terminal box, all the terminal boxes of the string are changed into a state capable of receiving the data acquisition command of the controller 1 again, and a complete active data acquisition process on one side of the fault point is completed.

The steps can be repeatedly executed, and the data information of all the junction boxes on two sides of the fault point can be circularly acquired.

To sum up, the communication method after the communication cable has a fault includes: 1) the left side and the right side of the fault point are communicated in an active uploading mode; 2) the left side of the fault point adopts a master-slave mode to communicate, and the right side adopts an active uploading mode to communicate; 3) the left side of the fault point adopts an active uploading mode to communicate, and the right side adopts a master-slave mode to communicate; 4) and the left side and the right side of the fault point are communicated in a master-slave mode. In the above embodiment, the description is given with emphasis on the communication modes 1), 2), and 4), and from the implementation details of 1), 2), and 4), the implementation details of the communication mode 3) can be easily derived from the details of the three communication implementation modes that have been described, which are not described herein again, but still within the protection scope of the present invention, and subsequently, if necessary, the right to supplement the embodiment of the communication mode 3) according to the previous three described embodiments of the communication mode is retained.

The embodiment of the invention also provides a solar system, which comprises a plurality of junction boxes corresponding to the solar components one by one as shown in fig. 1, wherein the junction boxes are sequentially connected in series through signal lines 11, and the plurality of the junction boxes connected in series are connected in series with the controller 1 to form a loop. As shown in fig. 3, the controller 1 includes a switching unit, the controller 1 is coupled to the signal line 11 through the switching unit, each of the terminal blocks includes a signal input/output unit 70 and a switching unit, and the terminal block is coupled to the signal line 11 through the switching unit. It should be noted that, in the embodiment of the present invention, the switching unit in the junction box 7 is described in detail, and the switching units in the junction boxes 8, 9, and 10 are the same as the switching unit in the junction box 7, and are not described again.

In another embodiment of the present invention, as shown in fig. 3, the switching unit includes a plurality of multiplexing units connected in parallel through a control signal line 6, and the plurality of multiplexing units connected in parallel are connected in series with a signal input output unit 70 through the control signal line 6. The multiplexing unit is characterized in that only one path is allowed to be selected to be conducted by the digital signal in a single direction, and the selected path is conducted under the control of the control signal. Optionally, the multiplexing unit may be a multiplexer such as 74HC153, 74HC251, SN74CBT3257, or a multiplexer of another model with a similar function, and because there are many models to be selected, there are not a list here, and the multiplexer is used in the switching unit, so that the switching between the receiving end and the transmitting end of the junction box is efficiently realized.

It should be noted that, the multiplexing unit mentioned herein refers to one functional unit in the multiplexer, and in this embodiment, a 4-bit 2-to-1 multiplexer may be used, that is, there are 4 multiplexing units in the multiplexer, or a combination of multiple multiplexers may be selected to implement a 4-bit 2-to-1 function, and the control signal line 6 of the multiplexing unit may refer to a control signal line that is located inside the multiplexer and controls gating of each multiplexing unit through a parallel relationship, or may refer to a control signal line that connects multiple multiplexers through a parallel relationship. A multiplexer is a device that receives multiple input signals and combines a single output signal in a recoverable manner for each input signal. A multiplexer is an integrated system that typically contains a number of data inputs with a single output. For components, a multiplexer element typically contains a multi-bit, multi-select-1 multiplexing unit inside.

As shown in fig. 3, an input pin of at least one of the multiplexing units is connected to an output pin TXD of the signal input/output unit 70, and an output pin of at least one of the multiplexing units is connected to an input pin RXD of the signal input/output unit 70, so as to switch a transmitting end and a receiving end of the terminal box, and after the switching, 702 is used as the transmitting end of the terminal box 7, and 701 is used as the receiving end of the terminal box.

In still another embodiment of the present invention, the switching unit includes a first multiplexing unit 2, a second multiplexing unit 3, a third multiplexing unit 4, and a fourth multiplexing unit 5 connected in parallel through a control signal line 6, and the first multiplexing unit 2, the second multiplexing unit 3, the third multiplexing unit 4, and the fourth multiplexing unit 5 connected in parallel are connected in series to a signal input-output unit 70 through the control signal line 6. As shown in fig. 3, for the signal input and output unit 70, it is necessary to establish communication connection with the outside through the output pin TXD and the input pin RXD, that is, in normal communication, one signal line of X0 and X1 shown in fig. 3 is selected as a signal output line of the switching unit, which establishes unidirectional transmission relationship of digital signals with the TXD pin of the signal input and output unit 70, and correspondingly, the other signal line is selected as a signal input line of the switching unit, which establishes unidirectional transmission relationship of digital signals with the RXD pin of the signal input and output unit 70.

Alternatively, the input pin 201 (or 202) of the first multiplexing unit 2 is connected to the output pin TXD of the signal input output unit 70, the output pin 303 of the second multiplexing unit 3 is connected to the input pin RXD of the signal input output unit 70, the output pin 403 of the third multiplexing unit 4 is connected to the input pin RXD of the signal input output unit 70, and the input pin 502 (or 501) of the fourth multiplexing unit 5 is connected to the output pin TXD of the signal input output unit 70. Optionally, the output pin 203 of the first multiplexing unit 2 and the input pin 302 (or 301) of the second multiplexing unit 3 are connected through a first signal line X0 (i.e., a signal output line), and the first signal line X0 is coupled with the receiving end of the next junction box in the loop; the input pin 401 (or 402) of the third multiplexing unit 4 and the output pin 503 of the fourth multiplexing unit 5 are connected through a second signal line X1 (i.e., a signal input line), and the second signal line X1 is coupled to the transmitting end of the previous junction box in the loop.

The control signal line 6 is used to control the gating of each multiplexing unit, in this embodiment, the control signal transmitted on the control signal line 6 is simultaneously effective for all multiplexing units, and taking a binary control signal as an example, for example, 00 selects the first output of the gating multiplexing unit, and 01 selects the second output. For example, when the control signal line 6 outputs a 00 signal, the first input pin 201 of the first multiplexing unit 2 is gated, the first input pin 401 of the third multiplexing unit 4 is gated, and the output signal of the gated signal input-output unit 70 is output through the signal output line X0, that is, X0 as a signal output line and X1 as a signal input line. At this time, the output pin 303 of the second multiplexing unit 3 and the output pin 503 of the fourth multiplexing unit 5 are also connected to their respective input pins 301 and 501, respectively, but they do not externally input and output signals as empty ports.

Similarly, when the control signal line 6 outputs a 01 signal, the pins of the second multiplexing unit 3 and the fourth multiplexing unit 5 are gated to their

respective output pins

302 and 502, respectively, so that X0 serves as a signal input line of the terminal block 7 and X1 serves as a signal output line of the terminal block 7, thereby realizing port interchange of the terminal block 7.

In some embodiments of the present invention, the controller 1 forms the communication link with interchangeable signal input/output ports by using a serial bus transceiver with transceiving control function (such as a communication function chip with transceiving control function, such as RS485 and RS 422), and the junction box associated with the solar module also forms the communication link with interchangeable signal input/output ports by using the serial bus transceiver with input/output control function. The method is characterized in that 2 serial bus transceivers with transceiving control functions are respectively arranged in a controller 1 and each junction box, one of the two serial bus transceivers is controlled to receive data and also can be controlled to transmit data, the other serial bus transceiver is controlled to transmit data and also can be controlled to receive data, and the state of the original bus transceiver can be inverted under the action of a control signal line of the controller 1 or the junction box, namely, the bus transceiver which is originally used as an output function is inverted into a bus transceiver which is used as an input function or the bus transceiver which is originally used as an input function is inverted into a bus transceiver which is used as an output function. The bus transceiver as the receiving end receives data, and the bus transceiver as the transmitting end sends out the received data or the processed data so as to respectively realize the functions of receiving signals and sending signals.

In another embodiment of the present invention, the switching unit includes a plurality of bus transceivers connected in parallel through the control signal line 6 and an inverter 71, the plurality of bus transceivers connected in parallel being connected in series with the signal input output unit 70 through the control signal line 6, the inverter being connected in series between one of the bus transceivers and the signal input output unit 70. As shown in fig. 4, the switching unit includes two serial bus transceivers controllable for transceiving connected in parallel through the control signal line 6, and a functional unit (e.g., an inverter) functioning in reverse, and the two serial bus transceivers connected in parallel through the signal line 6 are connected in series with the signal input/output unit 70 through the control signal line 6. Wherein, the input pins R of the first bus transceiver 72 and the second bus transceiver 73 are connected in series with the input pin RXD of the signal input and output unit 70, and the output pins D of the first bus transceiver 72 and the second bus transceiver 73 are connected in series with the output pin TXD of the signal input and output unit 70. In order to enable one of the first bus transceiver 72 and the second bus transceiver 73 to transmit data and the other to receive data in the same operation cycle, one branch of the inverter 71 and the control signal line 6 is connected to the transceiving selection enable pins (/ RE and DE) of one bus controller, and the other branch is connected to the transceiving selection enable pins (/ RE and DE) of the other bus controller through the inverter 71.

The switching unit has a first signal line and a second signal line, the first signal line can be used as a signal output line or a signal input line, the second signal line can be used as a signal input line or a signal output line, the number of the first signal lines is more than or equal to 1, and the number of the second signal lines is more than or equal to 1. Specifically, as shown in fig. 4, the first signal line is composed of two balanced buses encircled by an oval frame 74, the number of the first signal lines is 2, if a common ground is counted, the number of the first signal lines is 3, the second signal line is composed of two balanced buses encircled by an oval frame 75, the number of the second signal lines is 2, and if a common ground is counted, the number of the second signal lines is 3.

The control signal line 6 is used for controlling the switching unit to control the first signal line as a signal output line and the second signal line as a signal input line, or to control the first signal line as a signal input line and the second signal line as a signal output line, or to control the first signal line as a signal input line or an output line, or to control the second signal line as a signal output line or an input line. Specifically, as shown in fig. 4, when the output signal of the control signal line 6 is low, the first bus transceiver 72 is selected to receive data, and accordingly, the second bus transceiver 73 is selected to transmit data due to the reverse action of the inverter 71, and when the output signal of the control signal line is high, the first bus transceiver 72 is selected to transmit data, and the second bus transceiver 73 is selected to receive data. Accordingly, if it is desired to change the i/o status of only one bus transceiver and the i/o status of the other bus transceiver is fixed (as is generally used in the controller 1, for example, one of the bus transceivers may be fixed in a data receiving status for actively receiving data in the controller 1, and one of the bus transceivers may also be fixed in a data transmitting status in the controller 1 when data receiving problems on one side of a failure point at the time of a communication failure are not considered), a simple implementation is achieved by disconnecting the enable pins (/ RE and DE) of the first bus transceiver 72 from the control signal line 6 and connecting the enable pins (/ RE and DE) to a low level to fix the bus transceiver to receiving data, and connecting the enable pins (/ RE and DE) to a high level to fix the bus transceiver to transmitting data, similarly, the second bus transceiver 73 may also be fixed to receive data or transmit data in a similar manner.

When the first signal line is used as an output signal line, the switching unit leading out the first signal line can prevent a signal on the first signal line from being led onto an input signal line RXD of the signal input/output unit 70, and when the first signal line is used as an input signal line, the switching unit leading out the first signal line can prevent a signal on an output signal line TXD of the signal input/output unit 70 from being led onto the first signal line, which is coupled with a receiving end or a transmitting end of a next junction box in the loop.

When the second signal line is used as an input signal line, the switching unit leading out the second signal line can prevent a signal on the output signal line TXD of the signal input/output unit 70 from being led onto the second signal line, and when the second signal line is used as an output signal line, the switching unit leading out the second signal line can prevent a signal on the second signal line from being led onto the input signal line TXD of the signal input/output unit 70, and the second signal line is coupled with a transmitting end or a receiving end of a last junction box in the loop.

Specifically, as shown in fig. 4, when the first signal line is an output signal line, the first bus transceiver 72 transmits data, and its receiving function is already locked by the control signal on the control signal line 6 when transmitting data, so as to prevent the signal transmitted on the first signal line from being led to the input pin RXD of the signal input/output unit 70 through the receiving pin R of the first bus transceiver, and ensure that the data received on the second bus transceiver is not affected at this time; when the first signal line is used as an input signal line, the first bus transceiver 72 receives data, and its transmitting function is already locked by the control signal on the control signal line 6 when receiving data, so as to prevent the signal output from the output pin TXD of the signal input/output unit 70 from being introduced to the first signal line through the transmitting pin D of the first bus transceiver, thereby ensuring that the data received by the first bus transceiver is not affected. Similarly, when the second signal line is used as an input signal line or an output signal line, the implementation principle is similar to that described above, and is not described herein again.

The first signal line is used as an output signal line, the second signal line is used as an input signal line, the switching unit is used for leading the signal on the output signal line TXD of the signal input and output unit 70 to the first signal line, and leading the signal on the second signal line to the input signal line RXD of the signal input and output unit 70; the first signal line is used as an input signal line, the second signal line is used as an output signal line, and the switching unit is used for leading a signal on the first signal line to the input signal line RXD of the signal input and output unit 70 and leading a signal on the output signal line TXD of the signal input and output unit 70 to the second signal line. Specifically, as shown in fig. 4, the switching unit specifically includes: a first bus transceiver 72, a second bus transceiver 73, an inverter 71; when the signal control line 6 of the signal input/output unit 70 is at a high level, the first bus transceiver 72 is controlled to transmit the signal on the output signal line TXD of the signal input/output unit 70 to the first signal line by the transmitter, and at the same time, the second bus transceiver 73 is controlled to serve as a receiver to transmit the signal on the second signal line to the input signal line RXD of the signal input/output unit 70; similarly, the implementation principle of the first signal line as the input signal line and the second signal line as the output signal line is similar to that described above, and is not described herein again.

In some embodiments of the present invention, the controller 1 forms the communication link with the interchangeable signal input/output port by using the serial bus transceiver without the transceiving control function (for example, a communication function chip such as RS232 and RS422 with the full-duplex communication function and without the transceiving control function). The specific method is that 2 serial bus transceivers without transceiving control function and a data buffer (such as 74AC125) capable of playing data transceiving control function are respectively arranged in the controller 1 and each junction box, by properly designing the strobe direction of the signal across the data buffer, and properly designing the output state of the data buffer, one of the two serial bus transceivers may be controlled to receive data, and may be controlled to transmit data, the other may be controlled to transmit data, and may be controlled to receive data, and the state of the original bus transceiver can be reversed under the action of the control signal wire of the controller 1 or the junction box, namely, the bus transceiver originally used as the output function is converted into the bus transceiver used as the input function, or the bus transceiver originally used as the input function is converted into the bus transceiver used as the output function. The bus transceiver as the receiving end receives data, and the bus transceiver as the transmitting end sends out the received data or the processed data so as to respectively realize the functions of receiving signals and sending signals.

In another embodiment of the present invention, as shown in fig. 5, the switching unit comprises a data buffer unit 80 with controllable output, at least one serial bus transceiver without transceiving control function, and a functional unit 71 (such as an inverter) with reverse function. As shown in fig. 5, the output-controllable data buffer unit 80 includes 4 tri-state data buffers, the output On of the tri-state data buffers is controlled by the input Bn and the control An, when An is at An inactive level (high level or low level or high impedance), the output On is at a high impedance state, and when An is at An active level (high level or low level or high impedance), the output On is the same as or opposite to the input Bn.

The 4 tri-state data buffers may be divided into two groups, wherein the control pin An of one group of tri-state data buffers is connected to the control signal line 6, the control pin An of the other group of tri-state data buffers is connected to the output terminal of the inverter 71 and controlled by the output of the inverter 71, and the input terminal of the inverter 71 is connected to the control signal line 6. An input Bn of one of the tri-state data buffers in the group of tri-state data buffers is connected to the receiving end R of the first bus transceiver 82, an output On of the tri-state data buffer is connected to the input pin RXD of the signal input/output unit 70, an input Bn of the other tri-state data buffer is connected to the output pin TXD of the signal input/output unit 70, and an output On of the tri-state data buffer is connected to the transmitting end D of the second bus transceiver 81; an input Bn of one of the tri-state data buffers in the other set of tri-state data buffers is connected to the receiving end R of the second bus transceiver 81, an output On of the tri-state data buffer is connected to the input pin RXD of the signal input output unit 70, an input Bn of the other tri-state data buffer is connected to the output pin TXD of the signal input output unit 70, and an output On of the tri-state data buffer is connected to the transmitting end D of the first bus transceiver 82.

As shown in fig. 5, in order to enable the first bus transceiver 82 and the second bus transceiver 81 to transmit and receive data, the receiving end A, B and the transmitting end Z, Y of the first bus transceiver 82 and the second bus transceiver 81 are interconnected, respectively.

The switching unit has a first signal line and a second signal line, the first signal line can be used as a signal output line or a signal input line, the second signal line can be used as a signal input line or a signal output line, the number of the first signal lines is more than or equal to 1, and the number of the second signal lines is more than or equal to 1. Specifically, as shown in fig. 7, the first signal line is composed of two balanced buses wound around an oval frame 84, the number of the first signal lines is 2, if a common ground is added, the number of the first signal lines is 3, the second signal line is composed of two balanced buses wound around an oval frame 83, the number of the second signal lines is 2, and if a common ground is added, the number of the second signal lines is 3.

The control signal line 6 is used for controlling the switching unit to control the first signal line as a signal output line and the second signal line as a signal input line, or to control the first signal line as a signal input line and the second signal line as a signal output line, or to control the first signal line as a signal input line or an output line, or to control the second signal line as a signal output line or an input line. Specifically, as shown in fig. 5, when the output signal of the control signal line 6 is at a low level, one group (two) of buffers in the output-controllable tri-state data buffering unit (80) is enabled, so that the first bus transceiver 82 is selected to receive data, and the second bus transceiver 81 is selected to transmit data; when the output signal of the control signal line 6 is high level, the other group (two) of buffers in the output controllable tri-state data buffer unit (80) are enabled (due to the action of the inverter 71), so that the first bus transceiver 82 is selected to transmit data, and the second bus transceiver 81 is selected to receive data; on the basis of the structure diagram shown in fig. 5, it is easy for those skilled in the art to separately control the first signal line (the selected part of the ellipse 84) as the signal output line or the signal input line, and control the second signal line (the selected part of the ellipse 83) as the signal output line or the signal input line, and the implementation contents are within the protection scope of the present invention and will not be described herein.

Specifically, as shown in fig. 5, when the first signal line is an output signal line, the first bus transceiver 82 transmits data, one set of buffers (buffer 8003, buffer 8004) in the output-controllable tri-state data buffer 80 is enabled, the other set of buffers (buffer 8001, buffer 8002) is disabled, and since the buffer 8001 is disabled, a signal on the first signal line cannot be introduced to the signal line RXD of the signal input/output unit 70 through the buffer 8001 at this time, and thus, data reception on the second signal line can be effectively prevented from being affected; when the first signal line is used as an input signal line, the first bus transceiver 82 receives data, one set of buffers (buffer 8001 and buffer 8002) in the output-controllable tri-state data buffer 80 is enabled, the other set of buffers (buffer 8003 and buffer 8004) is disabled, and since the buffer 8003 is disabled, a signal on the output signal line TXD of the signal input/output unit 70 cannot be led to the transmitting end D of the first bus transceiver 82 through the buffer 8003 at this time, so that the data reception on the first signal line can be effectively prevented from being influenced.

As shown in fig. 5, when the second signal line is used as an input signal line, the second bus transceiver 81 receives data, one set of buffers (buffer 8003, buffer 8004) in the output-controllable tri-state data buffer 80 is enabled, the other set of buffers (buffer 8001, buffer 8002) is disabled, and since the buffer 8002 is disabled, a signal on the output signal line TXD of the signal input/output unit 70 cannot be introduced to the transmitting end D of the second bus transceiver 81 through the buffer 8002 at this time, so that the data reception on the second signal line can be effectively prevented from being affected; when the second signal line is an output signal line, the second bus transceiver 81 transmits data, one set of buffers (buffer 8001, buffer 8002) in the output-controllable tri-state data buffer 80 is enabled, the other set of buffers (buffer 8003, buffer 8004) is disabled, and since the buffer 8004 is disabled, a signal on the second signal line cannot be introduced to the signal line RXD of the signal input/output unit 70 through the buffer 8004 at this time, and thus, the influence on the reception of data on the first signal line can be effectively avoided.

The first signal line is used as an output signal line, the second signal line is used as an input signal line, the switching unit is used for leading the signal on the output signal line TXD of the signal input and output unit 70 to the first signal line, and leading the signal on the second signal line to the input signal line RXD of the signal input and output unit 70; the first signal line is used as an input signal line, the second signal line is used as an output signal line, and the switching unit is used for leading a signal on the first signal line to the input signal line RXD of the signal input and output unit 70 and leading a signal on the output signal line TXD of the signal input and output unit 70 to the second signal line. Specifically, as shown in fig. 5, the switching unit specifically includes: a first bus transceiver 82, a second bus transceiver 81, an inverter 71, and a tri-state data buffer 80 with controllable output; when the signal control line 6 of the signal input/output unit 70 is at a high level, the buffer 8003 selects the signal on the output signal line TXD of the signal input/output unit 70 to be transmitted to the first signal line, and at the same time, the second bus transceiver 73 is controlled as a receiver to transmit the signal on the second signal line to the input signal line RXD of the signal input/output unit 70 through the buffer 8004; similarly, the implementation principle of the first signal line as the input signal line and the second signal line as the output signal line is similar to that described above, and is not described herein again.

In some embodiments of the present invention, the data buffer (e.g., 74AC125) that can serve as a data transceiving control function can be replaced by another control unit, such as a 4-bit 1-out-of-2 multiplexer 74BCT3257 or a controllable electronic switch, instead of the tri-state data buffer 74AC125, and the purpose of controlling the bus transceiver is achieved by properly designing the gating logic, so that the first bus transceiver can be used to transmit data or receive data, and the second bus transceiver can be used to transmit data or receive data, ensuring that the first bus transmit data and the second bus receive data are not affected or the first bus receive data and the second bus transmit data are not affected at the same time. Specifically, as shown in fig. 6, the internal principle of the multiplexer 2-to-1 is similar to that of the multiplexer shown in fig. 6, and only the electronic switches are taken as an example for description, as shown in fig. 6, control terminals of the first electronic switch 8009 and the fourth electronic switch 8012 are connected to each other and then connected to the control signal line 6, control terminals of the second electronic switch 8010 and the third electronic switch 8011 are connected to each other and then connected to the output terminal of the inverter 71, and the input terminal of the inverter 71 is connected to the control signal line 6; one end of the first electronic switch 8009 and one end of the second electronic switch 8010 are connected to the output pin TXD of the signal input and output unit 70, the other end of the first electronic switch 8009 is connected to the first transmitting terminal T1IN of the bus transceiver 91, and the other end of the second electronic switch 8010 is connected to the second transmitting terminal T2IN of the bus transceiver 91; one end of the third electronic switch 8011 and one end of the fourth electronic switch 8012 are connected to the input pin RXD of the signal input and output unit 70, the other end of the third electronic switch 8011 is connected to the first receiving end R1OUT of the bus transceiver 91, and the other end of the fourth electronic switch 8012 is connected to the second receiving end R2OUT of the bus transceiver 91.

In some embodiments of the present invention, the purpose of controlling the bus transceiver may be achieved by combining a controllable tri-state buffer with a 2-to-1 multiplexer (or a controllable electronic switch) and by properly designing the gating logic, so that the first bus transceiver may be used for transmitting data or receiving data, and the second bus transceiver may be used for transmitting data or receiving data, and it is ensured that at the same time, the first bus transmission data and the second bus reception data are not affected or the first bus reception data and the second bus transmission data are not affected. Specifically, as shown in fig. 7, the input terminals Bn of the first buffer 8005 and the second buffer 8006 are interconnected and then connected to the output pin TXD of the signal input/output unit 70, the output terminal of the first buffer 8005 is connected to T1IN of the bus transceiver 91, the output terminal of the second buffer 8006 is connected to T2IN of the bus transceiver 91, the control terminal An of the first buffer is connected to the output of the inverter 71, and the control terminal An of the second buffer is connected to the control signal line 6; one ends of the first electronic switch 8007 and the second electronic switch 8008 are connected to an input pin RXD of the signal input/output unit after being interconnected, the other end of the first electronic switch 8007 is connected to R1OUT of the bus transceiver 91, and the other end of the second electronic switch 8008 is connected to R2OUT of the bus transceiver 91; the input terminal of the inverter 71 is connected to the control signal line 6.

In some embodiments of the present invention, the first transmitting output terminal T1OUT of the bus transceiver 91 is connected to the first receiving input terminal R1IN thereof, the second transmitting output terminal T2OUT of the bus transceiver 91 is connected to the second receiving input terminal R2IN thereof, and the bus transceiver after interconnection may respectively lead OUT a first signal line X0 and a second signal line X1; in this embodiment, the bus transceiver 84 can be replaced by two other types of bus transceivers, such as an RS422 bus transceiver with a balanced bus, and the usage method after the replacement is similar to that described in this embodiment, which is not repeated herein, and still the protection content of the present invention is provided.

In some embodiments of the present invention, in the solar energy system, the first signal line X0 and the second signal line X1 in the junction box are connected to each other through a normally closed contact with a controllable state, and the purpose of the mutual connection is to provide a communication bypass for the junction box which is not in operation when the junction box is not in operation or in failure (such as the junction box is damaged or communication fails), so that communication and data transmission of other junction boxes in the solar energy system are not affected. Specifically, as shown in fig. 6, the first signal line X0 and the second signal line X1 are respectively connected to two ends of a contact of the controllable normally closed contact 92, and a control end of the normally closed contact 92 is controlled by another control end of the signal input/output unit 70, so as to ensure that the normally closed contact 92 is in an open state during normal operation, and under the necessary condition of normal operation, the normally closed contact can be controlled to return to the normally closed state, the normally closed contact 92 is naturally in a closed state when the junction box fails, and when the bus transceiver has a problem, the junction box cannot receive data for a predetermined time, and the normally closed contact 92 can be controlled to be in a closed state to bypass the communication of the junction box, so as to ensure that the communication of other junction. In other embodiments, the controllable normally closed contact may also be disposed between the first signal line X0 and the second signal line X1, the basic principle is the same as that described in this embodiment, and when the first signal line or the second signal line is a multi-trace line, the number of normally closed contacts may be increased accordingly, which is within the protection scope of the present invention and will not be described again.

Therefore, after the communication cable has a fault, the embodiment of the invention receives the data information of all the junction boxes on two sides of the fault point through the input end and the output end of the switching controller, thereby realizing the communication during the fault. Therefore, the embodiment of the invention can solve the problem that communication cannot be carried out due to the fault of the communication cable, and can ensure that the communication cable can also communicate with each junction box after the fault of the communication cable occurs, thereby receiving the communication data of each junction box. In addition, the embodiment of the invention adopts the switching unit to switch the input end and the output end of the controller, thereby solving the problems of higher cost, higher power consumption and unsuitability for transmitting digital communication signals of the bidirectional controlled switch.

Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method of the embodiments of the present invention.

It should be noted that, for the sake of simplicity, the above-mentioned embodiments of the system, method and electronic device are all described as a series of acts or a combination of modules, but those skilled in the art should understand that the present invention is not limited by the described order of acts or the connection of modules, because some steps may be performed in other orders or simultaneously and some modules may be connected in other manners according to the present invention.

It should also be understood by those skilled in the art that the embodiments described in the specification are included in one embodiment, the number of the above embodiments is merely for description, and the actions and modules involved are not necessarily essential to the invention.

In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the embodiments provided in the present invention, it should be understood that the disclosed technical contents can be implemented in other manners. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. The storage medium includes volatile storage medium or non-volatile storage medium, such as various media capable of storing program codes, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A method for switching signal lines is characterized in that a plurality of junction boxes which correspond to solar modules one by one are preset, the junction boxes are sequentially connected in series through the signal lines, and the plurality of the junction boxes after being connected in series are connected with a controller in series to form a loop, and the method comprises the following steps:

2. The method of claim 1, wherein switching the input and output of the controller to receive missing data information via the switched input comprises:

the controller switches the input end and the output end of the controller;

3. The method of claim 1, wherein switching the input and output of the controller to receive missing data information via the switched input comprises:

the controller switches the input end and the output end of the controller;

4. The method of switching signal lines according to any one of claims 1 to 3, wherein the data information includes an encoded number of the terminal block, the method further comprising:

and carrying out fault alarm according to the determined fault point.

5. A method for switching signal lines is characterized in that a plurality of junction boxes which correspond to solar modules one by one are preset, the junction boxes are sequentially connected in series through the signal lines, and the plurality of the junction boxes after being connected in series are connected with a controller in series to form a loop, and the method comprises the following steps:

6. The method of claim 5, wherein the terminal box sends its data information to the switched input end of the controller through the switched sending end, and the method comprises:

7. The method of switching a signal line according to claim 1, further comprising:

8. A solar energy system is characterized by comprising a plurality of junction boxes which correspond to solar energy components one by one, wherein the junction boxes are sequentially connected in series through signal wires (11), and the plurality of serially connected junction boxes are connected with a controller (1) in series to form a loop; wherein the controller (1) comprises a switching unit, the controller (1) is coupled with the signal line (11) through the switching unit, each of the junction boxes comprises a signal input and output unit (70) and the switching unit, and the junction boxes are coupled with the signal line (11) through the switching unit.

9. Solar system according to claim 8, characterized in that said switching unit comprises a plurality of multiplexing units connected in parallel by a control signal line (6), said plurality of multiplexing units connected in parallel being connected in series with a signal input output unit (70) by said control signal line (6).

10. The solar energy system according to claim 8, wherein the switching unit comprises a plurality of bus transceivers connected in parallel through a control signal line (6) and an inverter (71), the plurality of bus transceivers connected in parallel being connected in series with the signal input output unit (70) through the control signal line (6), the inverter (71) being connected in series between one of the bus transceivers and the signal input output unit (70).

11. The solar system according to claim 8, wherein the switching unit further comprises a plurality of tri-state data buffers and an inverter (71), the plurality of tri-state data buffers are divided into two groups, wherein the control pins of one group of tri-state data buffers are connected with the control signal line (6), the control pins of the other group of tri-state data buffers are connected with the output terminal of the inverter (71), and the input terminal of the inverter (71) is connected with the control signal line (6);

the input end of one tri-state data buffer in one group of tri-state data buffers is connected with the receiving end of a first bus transceiver (72), the output end of the tri-state data buffer is connected with the input pin of a signal input and output unit (70), the input end of the other tri-state data buffer is connected with the output pin of the signal input and output unit (70), and the output end of the tri-state data buffer is connected with the transmitting end of a second bus transceiver (73); the input end of one tri-state data buffer in the other set of tri-state data buffers is connected with the receiving end of the second bus transceiver (73), the output end of the tri-state data buffer is connected with the input pin of the signal input and output unit (70), the input end of the other tri-state data buffer is connected with the output pin of the signal input and output unit (70), and the output end of the tri-state data buffer is connected with the transmitting end of the first bus transceiver (72).