A power line communication coupling device, power converter and system

Abstract

The application discloses a power line communication coupling device, a power converter and a system, relates to the technical field of power electronics, and the shell (401) of the device comprises a cable channel (402), a first interface (471), a second interface (472), a third interface (473) and a fourth interface (474). A first magnetic ring (403) and a second magnetic ring (404) are arranged around the cable channel (402) in the inner cavity of the shell (401); the first interface (471) is connected with the second interface (472) through a first winding (405), and the first winding (405) is wound on the first magnetic ring (403); the third interface (473) is connected with the fourth interface (474) through a second winding (406), and the second winding (406) is wound on the second magnetic ring (404); the first winding (405) generates an arc signal; and the second winding (406) transmits a PLC signal. The device supports individual power line communication on a photovoltaic string.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, specifically to a power line communication coupling device, a power converter, and a system. Background Technology

[0002] In the power converter of a photovoltaic system, power line communication (PLC) can use the cables used for power transmission as a carrier to realize communication functions, thereby avoiding the need to lay additional communication lines, and the communication signal is stable.

[0003] To achieve power line communication, it is generally necessary to pass the cable through the magnetic ring of the power line communication coupling device, and then couple the output signal to the cable through the magnetic ring for transmission, or couple the input signal from the cable through the magnetic ring.

[0004] However, in current power converters, multiple positive DC buses or multiple negative DC buses of the power conversion circuit are usually passed through the same magnetic ring. The voltage of each DC bus may be provided by one or more photovoltaic strings. Therefore, each magnetic ring corresponds to multiple photovoltaic strings, which makes it impossible for a single power line communication coupling device to perform individual power line communication for each photovoltaic string. Utility Model Content

[0005] In view of this, this application provides a power line communication coupling device, power converter and system that can support individual power line communication for each photovoltaic string and improve the integration of the device.

[0006] In a first aspect, this application provides a power line communication coupling device, which includes: a housing (401), a first magnetic ring (403), a second magnetic ring (404), a first winding (405), and a second winding (406); the housing (401) includes a cable channel (402), a first interface (471), a second interface (472), a third interface (473), and a fourth interface (474); the cable channel (402) is for transmitting a DC cable (500); the first magnetic ring (403) and the second magnetic ring (404) A cable channel (402) surrounds the inner cavity of the housing (401); the first interface (471) is connected to the second interface (472) through the first winding (405), the first winding (405) being wound around the first magnetic ring (403); the third interface (473) is connected to the fourth interface (474) through the second winding (406), the second winding (406) being wound around the second magnetic ring (404); the first winding (405) is used to sense and generate an arcing signal; the second winding (406) is used to transmit power line communication PLC signals.

[0007] In this implementation, the second magnetic ring used for coupling power line communication signals and the first magnetic ring of the arcing sensor are integrated into the same housing. The first and second interfaces are used to transmit arcing signals, while the third and fourth interfaces are used to transmit power line communication signals. This power line communication coupling device simultaneously supports power line communication signal coupling and arcing signal sampling, improving the device's integration. Current arcing detection methods, in order to locate the cable experiencing arcing, detect a single DC cable. However, since the first and second magnetic rings surround the same cable channel, the second magnetic ring can also be used for signal coupling to a single DC cable, enabling power line communication for that single DC cable. When the DC cable is used to connect a single photovoltaic string, this power line communication coupling device can perform power line communication for that single photovoltaic string.

[0008] In one possible implementation, the first magnetic ring (403) and the second magnetic ring (404) are respectively disposed at different positions along the cable channel (402).

[0009] By separating the positions of the first magnetic ring (403) and the second magnetic ring (404), the mutual interference between the first magnetic ring (403) and the second magnetic ring (404) can be reduced.

[0010] In one possible implementation, the first magnetic ring (403) and the second magnetic ring (404) are made of soft magnetic material.

[0011] In one possible implementation, the power line communication coupling device includes multiple sets of magnetic rings, multiple cable channels, multiple sets of interfaces, and multiple sets of windings; each set of magnetic rings includes a first magnetic ring and a second magnetic ring; each set of magnetic rings surrounds a corresponding cable channel within the inner cavity of the housing; each set of interfaces includes a first interface, a second interface, a third interface, and a fourth interface; each set of windings includes a first winding and a second winding; the first and second interfaces of each set of interfaces are connected through a first winding, and the third and fourth interfaces of each set of interfaces are connected through a second winding; each first winding is wound around a corresponding first magnetic ring; each second winding is wound around a corresponding second magnetic ring.

[0012] In one possible implementation, the power line communication coupling device further includes a shielding material layer located between the first magnetic ring (403) and the second magnetic ring (404).

[0013] In this implementation, the electromagnetic interference between the first and second magnetic rings can be reduced by using a shielding material layer, thereby improving reliability.

[0014] Secondly, this application also provides a power converter, which includes: an input port and a power line communication coupling device; the input port is used to connect a DC cable; the power line communication coupling device includes: a housing, a first magnetic ring, a second magnetic ring, a first winding, and a second winding; the housing includes a cable channel, a first interface, a second interface, a third interface, and a fourth interface; each cable channel is used to transmit a DC cable; the first magnetic ring and the second magnetic ring surround the cable channel in the inner cavity of the housing; the first interface is connected to the second interface through the first winding, the first winding being wound around the first magnetic ring; the third interface is connected to the fourth interface through the second winding, the second winding being wound around the second magnetic ring; the first winding is used to induct and generate an arcing signal; the second winding is used to transmit power line communication PLC signals.

[0015] The power line communication (PFC) coupling device used in this power converter integrates a second magnetic ring for coupling PSC signals and a first magnetic ring for arcing sensors into the same housing. The first and second interfaces are used to transmit arcing signals, while the third and fourth interfaces are used to transmit PSC signals. This allows the PSC coupling device to simultaneously support PSC signal coupling and arcing signal sampling, improving the device's integration. Arcing detection, used to locate the arcing cable, is performed on a single DC cable. Since the first and second magnetic rings surround the same cable channel, the second magnetic ring can also be used for signal coupling on a single DC cable, enabling PSC for that specific cable. When the DC cable is used to connect a single photovoltaic (PV) string, the PSC coupling device can perform PSC for that individual PV string, allowing the power converter to distinguish the PV string corresponding to the PSC signal and independently sample and process the PSC signals for each PV string.

[0016] In one possible implementation, the power converter is a photovoltaic inverter.

[0017] In one possible implementation, the cable channel is used to pass through a DC cable.

[0018] In one possible implementation, the power converter further includes an arc detection circuit (101) and a power line communication circuit; a first interface and a second interface are connected to the arc detection circuit (101); and a third interface and a fourth interface are connected to the power line communication circuit.

[0019] In one possible implementation, the first magnetic ring and the second magnetic ring are respectively positioned at different locations along the cable channel.

[0020] In one possible implementation, the first and second magnetic rings are made of soft magnetic materials.

[0021] In one possible implementation, the power line communication coupling device includes multiple sets of magnetic rings, multiple cable channels, multiple sets of interfaces, and multiple sets of windings; each set of magnetic rings includes a first magnetic ring and a second magnetic ring; each set of magnetic rings surrounds a corresponding cable channel within the inner cavity of the housing; each set of interfaces includes a first interface, a second interface, a third interface, and a fourth interface; each set of windings includes a first winding and a second winding; the first and second interfaces of each set of interfaces are connected through a first winding, and the third and fourth interfaces of each set of interfaces are connected through a second winding; each first winding is wound around a corresponding first magnetic ring; each second winding is wound around a corresponding second magnetic ring.

[0022] In one possible implementation, the power line communication coupling device further includes a shielding material layer located between the first magnetic ring and the second magnetic ring.

[0023] Thirdly, this application also provides a power conversion system, which includes the power converter described in the second aspect and any implementation thereof.

[0024] In one possible implementation, the power conversion system can be a photovoltaic power generation system, and the power conversion system also includes photovoltaic strings connected to the input port of the power converter. Attached Figure Description

[0025] Figure 1 A schematic diagram of a power converter provided in this application;

[0026] Figure 2 Schematic diagram of the power line communication coupling device provided in the embodiments of this application Figure 1 ;

[0027] Figure 3 Provided for the embodiments of this application Figure 2 The corresponding top view;

[0028] Figure 4 Schematic diagram of the power line communication coupling device provided in the embodiments of this application Figure 2 ;

[0029] Figure 5 Schematic diagram of the power line communication coupling device provided in the embodiments of this application Figure 3 ;

[0030] Figure 6 Schematic diagram of the power line communication coupling device provided in the embodiments of this application Figure 4 ;

[0031] Figure 7 A schematic diagram of the power converter provided in the embodiments of this application. Figure 1 ;

[0032] Figure 8 A schematic diagram of the power converter provided in the embodiments of this application. Figure 2 ;

[0033] Figure 9 This is a schematic diagram of a power conversion system provided in an embodiment of this application. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of this application, the application scenarios of the technical solution of this application will be described first below.

[0035] See Figure 1 The figure is a schematic diagram of a power converter provided in this application.

[0036] Taking the application of power converter 100 in photovoltaic power generation as an example, the input port of power converter 100 can be connected to multiple photovoltaic strings. Figure 1 The diagram only shows the positive input ports of the power converter 100, which are represented by PV1+, PV2+, ..., PVn+ respectively.

[0037] A photovoltaic string can be formed by connecting multiple photovoltaic modules in series, in parallel, or in a hybrid manner.

[0038] The power converter 100 typically includes an arcing sensor 101. To locate the cable where arcing has occurred, one arcing sensor 101 needs to be installed at each port. The arcing sensor 101 can detect the arcing signal of the photovoltaic string connected to each interface, thereby locating the arcing string.

[0039] To achieve power line communication, the magnetic ring of the power line communication coupling device is usually fitted onto the positive or negative DC bus of the multi-channel first power conversion circuit. Figure 1 The example shown uses four positive DC buses passing through a magnetic ring, but this does not constitute a limitation on specific applications. For ease of explanation, the following description and accompanying drawings use a boost circuit as an example for the first power conversion circuit. Multiple first power conversion circuits can be set in the first power conversion module 40 of the power converter 100.

[0040] The switch in the switching circuit 30 of the power converter 100 can be a relay. Figure 1 The following example illustrates the concept of connecting two photovoltaic (PV) strings to a single switch via a positive input port. When a single power line communication (PLC) coupling device's magnetic ring is mounted on four positive DC buses, it can simultaneously couple with eight PV strings. It should be understood that when the power converter 100 connects to more than eight PV strings, a greater number of magnetic rings are required.

[0041] Each magnetic ring needs to be driven by an independent power line communication chip. For example, magnetic ring 102A is driven by power line communication chip 21, and magnetic ring 102B is driven by power line communication chip 22. The power line communication chips can be set on the power line communication board 20, which can also be called the power line communication master node. The power line communication board 20 couples the power line communication signals to the DC bus through each magnetic ring for communication with optimizers, shutdown devices, etc.

[0042] In practical applications, power line communication signals can be used to transmit the operating status of photovoltaic strings, power generation information, temperature data, switching status of switching circuits, surge protector status, fault information, etc. The embodiments of this application do not impose specific limitations.

[0043] However, in the above methods, the magnetic ring of a single power line communication coupling device couples multiple DC buses, corresponding to multiple photovoltaic strings. This makes it impossible for a single power line communication coupling device to perform individual power line communication for each photovoltaic string, resulting in poor flexibility of power line communication and the inability to achieve photovoltaic string-level identification.

[0044] To address the aforementioned technical issues, this application provides a power line communication coupling device, a power converter, and a system. This device integrates a second magnetic ring for coupling power line communication signals and a first magnetic ring for an arcing sensor into the same housing, enabling the power line communication coupling device to simultaneously support power line communication signal coupling and arcing signal sampling. Since the first and second magnetic rings surround the same cable channel, when arcing detection is performed on a single DC cable, the second magnetic ring can also be used for signal coupling on that single DC cable, thus achieving power line communication on a single DC cable.

[0045] The terms "first" and "second" used in this application description are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0046] In this application, unless otherwise expressly specified and limited, the term "connection" shall be interpreted broadly. For example, "connection" may be a fixed connection, a detachable connection, or an integral part; it may be a direct connection or an indirect connection through an intermediate medium.

[0047] See also Figure 2 and Figure 3 . Figure 2 A schematic diagram of a power line communication coupling device provided in an embodiment of this application; Figure 3 Provided for the embodiments of this application Figure 2 The corresponding top view.

[0048] The power line communication coupling device 400 provided in this application embodiment includes a housing 401, a first magnetic ring 402, a second magnetic ring 403, a first winding 405, and a second winding 406.

[0049] The housing 401 includes a cavity, and the first magnetic ring 402 and the second magnetic ring 403 are both located inside the cavity of the housing 401.

[0050] The housing 401 includes a cable channel 402, a first interface 471, a second interface 472, a third interface 473, and a fourth interface 474. Figure 2 and Figure 3 Taking the example of each interface being located on the same surface of the housing 401, this does not constitute a limitation on the technical solution of this application. Each interface can also be located on different surfaces of the housing 401, thereby alleviating the possible congestion of signal transmission lines when connecting signal transmission lines through the interfaces.

[0051] For example, the first interface 471 and the second interface 472 are located on one surface of the housing 401, and the third interface 473 and the fourth interface 474 are located on the other surface of the housing 401; or, for another example, the first interface 471 and the third interface 473 are located on one surface of the housing, and the second interface 472 and the fourth interface 474 are located on the other surface of the housing 401; or, for yet another example, the first interface 471, the second interface 472, the third interface 473, and the fourth interface 474 can each be disposed on one surface of the housing 401.

[0052] The cable channel 402 is used to carry the DC cable 500. In this embodiment, the cross-sectional shape of the cable channel 402 is not specifically limited. Figure 2 and Figure 3 The example shown here uses a circular cross-section, but in practical applications, rectangles, rhombuses, ellipses, etc., can also be used.

[0053] The first magnetic ring 403 and the second magnetic ring 404 surround the cable channel 402 within the inner cavity of the housing 401. This application embodiment does not limit the specific dimensions of the first magnetic ring 403 and the second magnetic ring 404, and the dimensions of the first magnetic ring 403 and the second magnetic ring 404 may be the same or different.

[0054] The first interface 471 is connected to the second interface 472 via a first winding 405, which is wound around a first magnetic ring 403. In this embodiment, the specific number of turns of the first winding 405 is not limited.

[0055] In this embodiment, the first winding 405 is used to sense and generate an arcing signal. The first magnetic ring 403 can then function as the sensing magnetic ring for the arcing sensor. When an arc occurs on the cable 500, the first winding 405 can sense and generate an arcing signal, which is then output through the first interface 471 and the second interface 472. The first interface 471 and the second interface 472 can be connected to an arcing plate via a signal transmission line. Therefore, the power line communication coupling device 400 in this embodiment integrates the detection function of an arcing sensor.

[0056] The third interface 473 is connected to the fourth interface 474 via the second winding 406, which is wound around the second magnetic ring 404. In this embodiment, the specific number of turns of the second winding 406 is not limited.

[0057] The second winding 406 is used to transmit power line communication (PLC) signals. The third interface 473 and the fourth interface 474 can be connected to the power line communication chip via signal transmission lines. The second winding 406 can couple the PLC signals transmitted by the power line communication chip to the cable 500, or couple PLC signals from the cable 500, and send them to the power line communication chip through the third interface 473 and the fourth interface 474.

[0058] In practical applications, arc detection, in order to locate the cable where arcing has occurred, is performed on a single DC cable. Therefore, cable channel 402 typically only carries one DC cable 500. Since the first magnetic ring 403 and the second magnetic ring 404 of this power line communication coupling device surround the same cable channel 402, the second magnetic ring 404 can also be used for signal coupling on a single DC cable, thus enabling power line communication on that single DC cable. When this device is applied to a power converter, the DC cable 500 is used to connect a single photovoltaic string, thus enabling power line communication on that single photovoltaic string using this power line communication coupling device.

[0059] In this embodiment, the first magnetic ring 403 and the second magnetic ring 404 can be made of the same or different materials. In one possible implementation, the first magnetic ring 403 and the second magnetic ring 404 can be made of soft magnetic materials, such as one or more of nanocrystalline soft magnetic materials, amorphous soft magnetic materials, permalloy, or iron-silicon-aluminum alloys. Utilizing the easy magnetization and demagnetization properties of soft magnetic materials, the first magnetic ring 403 can improve the sensitivity of arc detection, the second magnetic ring 404 can improve the efficiency of energy coupling, and both the first magnetic ring 403 and the second magnetic ring 404 can reduce electromagnetic radiation to the outside.

[0060] In addition, this power line communication coupling device supports both power line communication signal coupling and arcing signal sampling, and also improves the integration of the device.

[0061] Furthermore, since two magnetic rings are simultaneously disposed in a single device, to prevent the two magnetic rings from interfering with each other during signal coupling, the solution provided in this application embodiment places the first magnetic ring 403 and the second magnetic ring 404 at different positions along the cable channel 402. At this time, the plane containing the first magnetic ring 403 and the plane containing the second magnetic ring 404 are... Figure 2 The coordinates corresponding to the Z-axis are different.

[0062] In one possible implementation, a shielding material layer can also be provided between the first magnetic ring 403 and the second magnetic ring 404 to further reduce the mutual influence between the two magnetic rings when they are coupled to a signal. This will be explained in detail below with reference to the accompanying drawings.

[0063] See Figure 4 This figure is a schematic diagram of the power line communication coupling device provided in an embodiment of this application. Figure 2 .

[0064] Figure 4 The power line communication coupling device shown is Figure 2 The difference is that it also includes a shielding material layer 408.

[0065] The shielding material layer 408 is located between the first magnetic ring 403 and the second magnetic ring 404. In this embodiment of the application, the thickness of the shielding material layer 408 is not specifically limited. It should be understood that the shielding material layer 408 is also located in the cavity of the housing 401.

[0066] The shielding material layer 408 can be made of metal, such as copper; the shielding material layer 408 can also be made of soft magnetic material. By utilizing the high magnetic permeability of soft magnetic material, the magnetic field lines are concentrated, thereby reducing the magnetic field strength of the external space and achieving the shielding purpose. Specifically, the soft magnetic material can be one or more of nanocrystalline soft magnetic material, amorphous soft magnetic material, permalloy or iron-silicon-aluminum alloy.

[0067] A first magnetic ring 403 and a second magnetic ring 404 can be referred to as a set of magnetic rings. The above description uses a power line communication coupling device including a set of magnetic rings as an example. The following describes the implementation of a power line communication coupling device including multiple sets of magnetic rings.

[0068] See Figure 5 This figure is a schematic diagram of the power line communication coupling device provided in an embodiment of this application. Figure 3 .

[0069] The power line communication coupling device 400 in this embodiment includes N sets of magnetic rings, N cable channels, N sets of interfaces, and N sets of windings, where N is an integer greater than or equal to 2. For ease of explanation, this embodiment uses N as an example of 2. In practical applications, N can also take other values, which will not be elaborated here.

[0070] Each set of magnetic rings includes a first magnetic ring and a second magnetic ring. Specifically, the first set of magnetic rings includes a first magnetic ring 403A and a second magnetic ring 404A; the second set of magnetic rings includes a first magnetic ring 403B and a second magnetic ring 404B.

[0071] Each set of magnetic rings surrounds a corresponding cable channel within the inner cavity of the housing. Specifically, the first magnetic ring 403A and the second magnetic ring 404A surround cable channel 402A within the inner cavity of the housing 401; the first magnetic ring 403B and the second magnetic ring 404B surround cable channel 402B within the inner cavity of the housing 401.

[0072] Each set of interfaces includes a first interface, a second interface, a third interface, and a fourth interface. Specifically, the first set of interfaces includes first interface 471A, second interface 472A, third interface 473A, and fourth interface 474A; the second set of interfaces includes first interface 471B, second interface 472B, third interface 473B, and fourth interface 474B.

[0073] Each winding group includes a first winding and a second winding, and the first and second interfaces of each group are connected through a first winding, while the third and fourth interfaces of each group are connected through a second winding. Specifically, the first interface 471A is connected to the second interface 472A through the first winding 405A; the third interface 473A is connected to the fourth interface 474A through the second winding 406A; the first interface 471B is connected to the second interface 472B through the first winding 405B; and the third interface 473B is connected to the fourth interface 474B through the second winding 406B.

[0074] Each first winding is wound on a corresponding first magnetic ring, and each second winding is wound on a corresponding second magnetic ring. Specifically, the first winding 405A is wound on the first magnetic ring 403A, and the second winding 406A is wound on the second magnetic ring 404A; the first winding 405B is wound on the first magnetic ring 403B, and the second winding 406B is wound on the second magnetic ring 404B.

[0075] Figure 5 The power line communication coupling device shown not only supports simultaneous coupling of power line communication signals and sampling of arcing signals, but also effectively combines multiple... Figure 2 The corresponding devices are centrally configured, enabling simultaneous power line communication for multiple photovoltaic strings, further enhancing the integration of the devices.

[0076] In this implementation, since multiple sets of magnetic rings are set inside the housing 401 of a single device, a shielding material layer can be set inside the housing 401 to avoid mutual interference between the magnetic rings during signal coupling. This will be explained in detail below with reference to the accompanying drawings.

[0077] See Figure 6 This figure is a schematic diagram of the power line communication coupling device provided in an embodiment of this application. Figure 4 .

[0078] Figure 6 The power line communication coupling device shown is Figure 5 The difference lies in the inclusion of shielding material layers 408A and 408B. Shielding material layer 408A reduces mutual interference between multiple magnetic rings distributed in the Z direction, while shielding material layer 408B reduces mutual interference between multiple magnetic rings distributed in the X direction. In practical applications, only one of shielding material layers 408A and 408B may be used.

[0079] The shielding material layer 408 can be made of metal or soft magnetic material, as can be seen in the description of the above embodiments. The embodiments of this application will not be repeated here.

[0080] Based on the power line communication coupling device provided in the above embodiments, this application also provides a power converter, which will be described in detail below with reference to the accompanying drawings.

[0081] See Figure 7 This figure is a schematic diagram of the power converter provided in an embodiment of this application. Figure 1 .

[0082] The power converter 100 provided in this application includes an input port and a power line communication coupling device 400. The input port can connect to multiple photovoltaic strings. Figure 7 The diagram only shows the positive input ports of the power converter 100, denoted by PV1+, PV2+, ..., PVn+. The power converter can connect to n photovoltaic strings, where n is a positive integer.

[0083] The power converter 100 may include n power line communication coupling devices 400. Each power line communication coupling device 400 includes a housing, a first magnetic ring, a second magnetic ring, a first winding, and a second winding. The housing includes a cable channel, a first interface, a second interface, a third interface, and a fourth interface. Each cable channel is used to transmit a DC cable; the first and second magnetic rings surround the cable channel within the housing cavity. The first interface is connected to the second interface via the first winding, which is wound around the first magnetic ring. The third interface is connected to the fourth interface via the second winding, which is wound around the second magnetic ring. The first winding is used to induct and generate an arcing signal. The second winding is used to transmit power line communication signals. For specific implementation details of the communication coupling device 400, please refer to the relevant descriptions in the above embodiments; these details will not be repeated here.

[0084] In this embodiment, the cable channel of each power line communication coupling device 400 is used to connect a corresponding input port via a DC cable. Figure 7 The following explanation uses a DC cable connection to a corresponding positive input port as an example.

[0085] For each power line communication coupling device 400, the second magnetic ring used for coupling power line communication signals and the first magnetic ring of the arc sensor are integrated in the same housing. The first and second interfaces are used to transmit arc signals, and the third and fourth interfaces are used to transmit power line communication signals. This allows the power line communication coupling device to simultaneously support power line communication signal coupling and arc signal sampling, thereby improving the integration of the device.

[0086] Arcing detection, in order to locate the cable where arcing has occurred, always involves testing a single DC cable. Figure 7 Each power line communication coupling device 400 has a cable channel through only one DC cable, which is connected to a positive input port. The first and second magnetic rings surround the same cable channel, so the second magnetic ring can also be used to couple signals for a single DC cable, realizing power line communication for a single DC cable. This allows the power line communication coupling device to perform power line communication for a single photovoltaic string. The power converter 100 can distinguish the photovoltaic string corresponding to the power line communication signal and independently sample and process the power line communication signal corresponding to each photovoltaic string.

[0087] In one possible implementation, the power converter 100 further includes an arc detection circuit 101, power line communication circuits P1-Pn, and a first power conversion module 40.

[0088] The first and second interfaces of each power line communication coupling device 400 are connected to the arc detection circuit 101, thereby transmitting the arc detection signal to the arc detection circuit 101.

[0089] Each power line communication coupling device 400 has its third and fourth interfaces connected to a corresponding power line communication circuit. Specifically, the third and fourth interfaces of the power line communication coupling device corresponding to the positive input port PV1+ are connected to power line communication circuit P1, the third and fourth interfaces of the power line communication coupling device corresponding to the positive input port PV2+ are connected to power line communication circuit P2, ..., and the third and fourth interfaces of the power line communication coupling device corresponding to the positive input port PVn+ are connected to power line communication circuit Pn.

[0090] Figure 7 The diagram only illustrates the specific connection methods of the power line communication coupling devices corresponding to the positive input ports PV1+ and PVn+. It should be understood that the connection methods of the power line communication coupling devices corresponding to other positive input ports, although not shown in the diagram, should be similar.

[0091] Figure 7 Taking a boost circuit as an example, multiple first power conversion circuits can be configured in the first power conversion module 40 of the power converter 100. The switches in the switching circuit 30 of the power converter 100 can be relays. Figure 1 The following example illustrates this: two photovoltaic strings are combined through the positive input port and then connected to a switch.

[0092] In one possible implementation, the power line communication circuit can be integrated on a chip, in which case the power line communication board 20 is equipped with n power line communication chips.

[0093] The following describes the implementation of a power line communication coupling device that includes multiple sets of magnetic rings.

[0094] See Figure 8 This figure is a schematic diagram of the power converter provided in an embodiment of this application. Figure 2 .

[0095] The power line communication coupling device 400 of the power converter 100 includes N sets of magnetic rings, N cable channels, N sets of interfaces, and N sets of windings, where N is an integer greater than or equal to 2. For ease of explanation, this embodiment uses N as an example of 2; in practical applications, N can also take other values. Figure 8 The power converter 100 in the middle uses Figure 5 or Figure 6 The power line communication coupling device 400 shown is illustrated.

[0096] Each power line communication coupling device 400 includes two cable channels, each cable channel being used to connect to a corresponding input port via a DC cable. Figure 8The following explanation uses a DC cable connection to a corresponding positive input port as an example.

[0097] For each power line communication coupling device 400, the second magnetic ring used for coupling power line communication signals and the first magnetic ring of the arc sensor are integrated in the same housing. The first and second interfaces are used to transmit arc signals, and the third and fourth interfaces are used to transmit power line communication signals. This allows the power line communication coupling device to simultaneously support power line communication signal coupling and arc signal sampling, thereby improving the integration of the device.

[0098] Furthermore, each second magnetic ring can be used for signal coupling to a single DC cable, enabling each power line communication coupling device to perform independent power line communication for the two photovoltaic strings. The power converter 100 can distinguish the photovoltaic string corresponding to the power line communication signal and independently sample and process the power line communication signal corresponding to each photovoltaic string.

[0099] The first and second interfaces of each power line communication coupling device 400 are connected to the arc detection circuit 101, thereby transmitting the arc detection signal to the arc detection circuit 101.

[0100] Each power line communication coupling device 400 has its third and fourth interfaces connected to a corresponding power line communication circuit. Specifically, the first third and fourth interfaces of the power line communication coupling device corresponding to the positive input port PV1+ are connected to power line communication circuit P1, and the second third and fourth interfaces are connected to power line communication circuit P2; and so on, the first third and fourth interfaces of the power line communication coupling device corresponding to the positive input port PVn+ are connected to power line communication circuit Pn-1, and the second third and fourth interfaces are connected to power line communication circuit Pn.

[0101] Figure 8 The power line communication coupling device in the system not only supports power line communication signal coupling and arcing signal sampling simultaneously, but also enables power line communication for multiple photovoltaic strings at the same time, further improving the integration of the device.

[0102] Based on the power converter provided in the above embodiments, this application also provides a power conversion system, which includes the power converter provided in the above embodiments. The power converter system can be a photovoltaic power generation system, and will be described in detail below with reference to the accompanying drawings.

[0103] The following is a detailed explanation with reference to the accompanying drawings.

[0104] See Figure 9 The figure is a schematic diagram of a power conversion system provided in an embodiment of this application.

[0105] The power conversion system 200 shown in the figure includes: a DC side circuit 201, a power converter 100, and an AC side circuit 202.

[0106] For details on the specific implementation and working principle of the power converter 100, please refer to the descriptions in the above embodiments; these will not be repeated here. The power converter 100 can be a photovoltaic inverter, used to invert the DC power provided by the photovoltaic string into AC power for output.

[0107] The DC side circuit 201 is connected to the DC side of the power converter 100.

[0108] In one possible implementation, the DC-side circuit 201 includes at least one photovoltaic string for generating DC power using light energy and outputting it to the DC side of the power converter 10.

[0109] The AC side circuit 202 is connected to the AC side of the power converter 100. The AC side circuit 202 may include an AC power grid, which may be a single-phase AC power grid or a three-phase AC power grid.

[0110] The power converter of this power conversion system uses the power line communication coupling device provided in this application, which can perform power line communication on a single photovoltaic string, enabling the power converter to distinguish the photovoltaic string corresponding to the power line communication signal, and to independently sample and process the power line communication signal corresponding to each photovoltaic string.

[0111] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0112] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power line communication coupling device, characterized in that, include: The housing (401), the first magnetic ring (403), the second magnetic ring (404), the first winding (405), and the second winding (406); The housing (401) includes a cable channel (402), a first interface (471), a second interface (472), a third interface (473), and a fourth interface (474); The cable channel (402) is used for transmitting DC cable (500); The first magnetic ring (403) and the second magnetic ring (404) surround the cable channel (402) within the inner cavity of the housing (401); The first interface (471) is connected to the second interface (472) through the first winding (405), and the first winding (405) is wound around the first magnetic ring (403); The third interface (473) is connected to the fourth interface (474) through the second winding (406), and the second winding (406) is wound around the second magnetic ring (404); The first winding (405) is used to sense and generate an arcing signal; The second winding (406) is used to transmit power line communication PLC signals.

2. The apparatus according to claim 1, characterized in that, The first magnetic ring (403) and the second magnetic ring (404) are respectively disposed at different positions along the cable channel (402).

3. The apparatus according to claim 1, characterized in that, The first magnetic ring (403) and the second magnetic ring (404) are made of soft magnetic material.

4. The apparatus according to any one of claims 1-3, characterized in that, The power line communication coupling device includes multiple sets of magnetic rings, multiple cable channels, multiple sets of interfaces, and multiple sets of windings; Each set of magnetic rings includes one first magnetic ring and one second magnetic ring; Each set of magnetic rings surrounds a corresponding cable channel within the inner cavity of the housing; Each set of interfaces includes one first interface, one second interface, one third interface, and one fourth interface; Each winding group includes a first winding and a second winding; The first and second interfaces of each group of interfaces are connected by a first winding, and the third and fourth interfaces of each group of interfaces are connected by a second winding. Each of the first windings is wound around a corresponding first magnetic ring; Each of the second windings is wound around a corresponding second magnetic ring.

5. The apparatus according to claim 1, characterized in that, The power line communication coupling device further includes: a shielding material layer; The shielding material layer is located between the first magnetic ring (403) and the second magnetic ring (404).

6. A power converter, characterized in that, The power converter includes: an input port and a power line communication coupling device (400); The input port is used to connect a DC cable; The power line communication coupling device includes: a housing, a first magnetic ring, a second magnetic ring, a first winding, and a second winding; The housing includes a cable channel, a first interface, a second interface, a third interface, and a fourth interface; Each of the cable channels is used for the passage of the DC cable; The first magnetic ring and the second magnetic ring surround the cable channel within the inner cavity of the housing; The first interface is connected to the second interface through the first winding, and the first winding is wound around the first magnetic ring; The third interface is connected to the fourth interface through the second winding, and the second winding is wound around the second magnetic ring; The first winding is used to sense and generate an arcing signal; The second winding is used to transmit power line communication PLC signals.

7. The power converter according to claim 6, characterized in that, Each of the cable channels is used for one of the DC cables.

8. The power converter according to claim 6, characterized in that, The power converter also includes an arc detection circuit (101) and a power line communication circuit; The first interface and the second interface are connected to the arc detection circuit (101); The third interface and the fourth interface are connected to the power line communication circuit.

9. The power converter according to any one of claims 6 to 8, characterized in that, The first magnetic ring and the second magnetic ring are respectively disposed at different positions along the cable channel.

10. The power converter according to any one of claims 6 or 8, characterized in that, The first magnetic ring and the second magnetic ring are made of soft magnetic material.

11. The power converter according to claim 6, characterized in that, The power line communication coupling device includes multiple sets of magnetic rings, multiple cable channels, multiple sets of interfaces, and multiple sets of windings; Each set of magnetic rings includes one first magnetic ring and one second magnetic ring; Each set of magnetic rings surrounds a corresponding cable channel within the inner cavity of the housing; Each set of interfaces includes one first interface, one second interface, one third interface, and one fourth interface; Each winding group includes a first winding and a second winding; The first and second interfaces of each group of interfaces are connected by a first winding, and the third and fourth interfaces of each group of interfaces are connected by a second winding. Each of the first windings is wound around a corresponding first magnetic ring; Each of the second windings is wound around a corresponding second magnetic ring.

12. The power converter according to claim 6, characterized in that, The power line communication coupling device further includes: a shielding material layer; The shielding material layer is located between the first magnetic ring and the second magnetic ring.

13. A power conversion system, characterized in that, The power converter includes any one of claims 6-12.

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