CN117595682A - Solar inverter - Google Patents
Solar inverter Download PDFInfo
- Publication number
- CN117595682A CN117595682A CN202310161818.0A CN202310161818A CN117595682A CN 117595682 A CN117595682 A CN 117595682A CN 202310161818 A CN202310161818 A CN 202310161818A CN 117595682 A CN117595682 A CN 117595682A
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- Prior art keywords
- circuit board
- arc detection
- solar inverter
- input terminal
- circuit
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- 238000001514 detection method Methods 0.000 claims abstract description 190
- 230000006698 induction Effects 0.000 claims abstract description 3
- 230000001629 suppression Effects 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 description 3
- 238000010183 spectrum analysis Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Inverter Devices (AREA)
Abstract
A solar inverter comprises a shell, at least one circuit board arranged in the shell, a current sensor arranged on the circuit board, an arc detection coil arranged on the circuit board, a self-detection circuit arranged on the circuit board and at least one direct current input terminal arranged on the shell and connected with the circuit board. The self-detection circuit is configured to deliver a test signal for induction by the arc detection coil. The direct current input terminal is configured to deliver a current through the arc detection coil, and the current sensor is configured to detect a magnitude of the current through the direct current input terminal.
Description
Technical Field
The present disclosure relates to a solar inverter.
Background
In the solar power system, a solar panel is installed outdoors and is connected to an inverter, a battery, and the like through a cable. Under the influence of outdoor environment, the cable is easy to damage, and electric arcs can appear when the cable is damaged, so that the cable is very dangerous.
Disclosure of Invention
In view of the foregoing, an object of the present disclosure is to provide a solar inverter with an arc detection mechanism.
To achieve the above object, according to some embodiments of the present disclosure, a solar inverter includes a housing, at least one circuit board disposed in the housing, a current sensor disposed on the circuit board, an arc detection coil disposed on the circuit board, a self-detection circuit disposed on the circuit board, and at least one direct current input terminal disposed on the housing and connected to the circuit board. The self-detection circuit is configured to deliver a test signal for induction by the arc detection coil. The direct current input terminal is configured to deliver a current through the arc detection coil, and the current sensor is configured to detect a magnitude of the current through the direct current input terminal.
In summary, unlike the existing solar inverter that uses an arc detection coil wound on a ring frame (core), the solar inverter of the present disclosure integrates the arc detection coil and the self-detection circuit on a circuit board, which is beneficial to saving cost and space, and can more conveniently perform arc detection and self-function detection for each solar string (string).
Drawings
The foregoing and other objects, features, advantages and embodiments of the present disclosure will be more readily understood from the following description of the drawings in which:
fig. 1 is a schematic diagram illustrating a solar power system according to an embodiment of the present disclosure.
Fig. 2 is an internal structural view of a solar inverter illustrating the solar power system shown in fig. 1.
Fig. 3 is a partially enlarged cross-sectional view illustrating a solar inverter according to another embodiment of the present disclosure.
Fig. 4 is a partially enlarged cross-sectional view illustrating a solar inverter according to another embodiment of the present disclosure.
Fig. 5 is a front view illustrating the solar inverter shown in fig. 4.
Fig. 6 is a partially enlarged cross-sectional view illustrating a solar inverter according to another embodiment of the present disclosure.
Fig. 7 is a front view illustrating a second circuit board of the solar inverter shown in fig. 6.
Fig. 8 is a partially enlarged cross-sectional view illustrating a solar inverter according to another embodiment of the present disclosure.
Fig. 9 is a partially enlarged cross-sectional view illustrating a solar inverter according to another embodiment of the present disclosure.
Fig. 10 is a partially enlarged cross-sectional view illustrating a solar inverter according to another embodiment of the present disclosure.
Fig. 11 is a partial enlarged sectional view illustrating a circuit board according to an embodiment of the present disclosure.
Fig. 12 is a partial enlarged sectional view illustrating a circuit board according to another embodiment of the present disclosure.
Fig. 13 is a partial enlarged sectional view illustrating a circuit board according to still another embodiment of the present disclosure.
Reference numerals illustrate:
10: solar power system
11: solar panel
12: solar inverter
13: arc detection unit
14: DC switch
15: detection circuit controller
20: shell body
25: DC input terminal
30: circuit board
50: circuit board
31: an opening
53: an opening
32: internal circuit
57: internal circuit
33: current sensor
35: arc detection coil
38: self-detection circuit
56: arc detection coil
58: self-detection circuit
37: connection terminal
39: electromagnetic interference suppression capacitor
60: cable with improved heat dissipation
65: cable with improved heat dissipation
70: electric connector
90: fastening piece
L1 to L6: layer(s)
AC: air shaft
Detailed Description
For a more complete and thorough description of the present disclosure, reference is made to the accompanying drawings and the various embodiments described below. The elements in the drawings are not drawn to scale and are provided merely to illustrate the disclosure. Numerous practical details are described below to provide a thorough understanding of the present disclosure, however, one of ordinary skill in the relevant art will understand that the present disclosure may be practiced without one or more of the practical details, and thus, these details are not to be taken as limiting the present disclosure.
Referring to fig. 1, a solar power system 10 includes a plurality of solar panels 11 and a solar inverter 12, wherein the solar inverter 12 is connected to the solar panels 11 and configured to convert dc power generated by the solar panels 11 into ac power, and then output the ac power to a power grid or power-using equipment. The solar inverter 12 includes an arc detection unit 13, and the arc detection unit 13 is configured to determine whether an arc fault (arc fault) occurs in a line between the solar inverter 12 and the solar panel 11. The solar inverter 12 further includes a dc switch 14. When the arc detection unit 13 determines that an arc fault has occurred in the line between the solar inverter 12 and the solar panel 11, the dc switch 14 is configured to cut off the dc power supplied from the solar panel 11 to the solar inverter 12. The solar inverter 12 further comprises a detection circuit controller 15. The detection circuit controller 15 is configured to inject a white noise or high frequency signal through a self-detection circuit (e.g., the self-detection circuit 38 of fig. 2), thereby detecting whether the arc detection unit 13 is functioning properly.
Further, the solar inverter 12 may stop receiving energy from the solar panel 11 when the arc detection unit 13 determines that an arc fault occurs in a line between the solar inverter 12 and the solar panel 11 (e.g., the solar inverter 12 may be turned off and stopped, or the solar panel 11 may cut off power to the solar inverter 12 by the dc switch 14). Because the solar panel 11 is a passive element, electricity is generated when the solar panel is irradiated by sunlight, and other direct current power sources such as a power supply, a battery and the like can be turned off when an abnormality is detected, the solar power system 10 of the present disclosure integrates an arc detection function into the solar inverter 12, and the solar inverter 12 detects an arc fault and cuts off (stops extracting current from the solar panel 11) when the arc fault occurs, so as to protect the solar power system 10.
Referring to fig. 2, the solar inverter 12 includes a housing 20 and one or more dc input terminals 25. The dc power input terminal 25 is provided on a wall surface of the housing 20 and is connected to the solar panel 11 (not shown in fig. 2, see fig. 1) to receive a current from the solar panel 11. In some embodiments, each dc input terminal 25 is connected to a string of solar energy, each string may comprise one or more solar panels 11.
As shown in fig. 2, the solar inverter 12 further includes a circuit board 30, and the circuit board 30 is disposed in the housing 20 facing the dc input terminal 25 and is connected to the dc input terminal 25. In the present embodiment, the dc power input terminal 25 is connected to the circuit board 30 via the cable 60. Specifically, the circuit board 30 has an opening 31, and one end of the cable 60 is connected to the dc power input terminal 25 and extends through the circuit board 30 via the opening 31. In some embodiments, the cable 60 passes through the circuit board 30 and then connects with a connection interface (e.g., connection terminals 37) on the circuit board 30.
As shown in fig. 2, the solar inverter 12 further includes a current sensor 33 (only schematic, not depicted in specific structure) disposed on the circuit board 30, the current sensor 33 being configured to detect the magnitude of the current through the dc power input terminal 25. In other words, the circuit board 30 has a function of detecting the input current of the dc power input terminal 25.
As shown in fig. 2, the solar inverter 12 further includes an arc detection coil 35, and the arc detection coil 35 is disposed on the circuit board 30 and disposed around the opening 31 of the circuit board 30. Thus, the dc power input terminal 25 may carry current through/across the arc detection coil 35 via the cable 60. In some embodiments, the arc detection coil 35 may be disposed on a surface of the circuit board 30. In other embodiments, the arc detection coil 35 may be embedded within the circuit board 30. The solar inverter 12 further includes a self-detection circuit 38, and the self-detection circuit 38 is also disposed on the circuit board 30 and is disposed on a portion of the arc detection coil 35. The self-detection circuit 38 sinks a white noise or high frequency signal, thereby detecting whether the white noise or high frequency signal can be detected by the arc detection coil 35.
The arc detection coil 35 is, for example, a Rogowski coil. The arc detection coil 35 may be connected to the arc detection unit 13 through a signal line (refer to fig. 1). The arc detection unit 13 may be provided on the circuit board 30 or may be provided on another circuit board. The arc detection unit 13 is configured to receive a signal (e.g., a voltage signal) from the arc detection coil 35, and perform signal processing and spectrum analysis on the received signal to determine whether an arc fault occurs in the string group corresponding to the dc input terminal 25. The arc detection unit 13 may include filters, amplifiers, digital signal processors or other electronic components to perform filtering, amplification, fourier analysis, etc. to perform spectral analysis to determine whether an arc fault occurs.
In the design of solar inverters, it is common practice to use arc detection coils wound around a toroidal skeleton (core) for arc detection, and the self-detection circuit 38 is part of the segment wound around the toroidal skeleton. However, this form of arc detection coil is bulky, the circuitry of the self-detection circuit 38 is also very cluttered, and is also costly. The solar inverter 12 of the present disclosure integrates the arc detection coil 35 and the self-detection circuit 38 together on the circuit board 30, so that the assembly space of the arc detection coil and the self-detection circuit can be saved, the cost is lower than that of the arc detection coil in the form of an annular skeleton, and the arc detection can be independently performed for the corresponding string group only by arranging the arc detection coil 35 on the direct current input terminal 25 on the circuit board 30.
Further, in the embodiment shown in fig. 2, the arc detection coil 35 and the self-detection circuit 38 are integrated on the original circuit board 30 for matching with the dc input terminal 25 and having the current detection function, so that the structure of the solar inverter 12 is simplified.
It should be noted that fig. 2 only representatively illustrates one of the dc input terminals 25 connected to the circuit board 30 via the cable 60, and the arc detection coil 35 and the self-detection circuit 38 corresponding to one of the dc input terminals 25. In actual practice, each dc input terminal 25 of the solar inverter 12 may be connected to one cable 60, and the circuit board 30 may be provided with a plurality of arc detection coils 35, each arc detection coil 35 passing through one of the dc input terminals 25 (i.e., surrounding one cable 60), and having a section of the self-detection circuit 38 surrounding the arc detection coil 35.
In some embodiments, the circuit board 30 is a bus circuit board. Specifically, the circuit board 30 is configured to receive current from a plurality of direct current input terminals 25 and output current via at least one output terminal (e.g., the connection terminal 37) provided on the circuit board 30, wherein the number of output terminals is smaller than the number of direct current input terminals 25. Therefore, in these embodiments, the arc detection coil 35 and the self-detection circuit 38 are integrated on the original bus circuit board, so that the structure of the solar inverter 12 becomes more compact.
In some embodiments, the solar inverter 12 further includes an electromagnetic interference suppression capacitor 39 disposed on the circuit board 30. Therefore, in these embodiments, the arc detection coil 35 is integrated on the circuit board 30 that is used to match with the dc input terminal 25 and has the electromagnetic interference suppression function, so that the structure of the solar inverter 12 is simplified.
Please refer to fig. 3. Unlike the foregoing embodiment, in the present embodiment, two or more dc power input terminals 25 share one arc detection coil 35. Specifically, the circuit board 30 has a plurality of openings 31, each opening 31 for one cable 60 to pass through, each cable 60 being connected to a different direct current input terminal 25. The arc detection coil 35 is disposed around the plurality of openings 31 such that the plurality of dc power input terminals 25 convey current through the arc detection coil 35 via the plurality of cables 60. The arc detection coil 35 may be connected to an arc detection unit through a signal line, and the arc detection unit is configured to receive a signal from the arc detection coil 35, and perform signal processing and spectrum analysis on the received signal to determine whether an arc fault occurs in a string corresponding to one of the dc input terminals 25. The partial section of the arc detection coil 35 also has a self-detection circuit 38 disposed around it to provide self-detection of the arc detection coil 35 and the arc detection unit.
Please refer to fig. 4 and fig. 5. Unlike the previous embodiment in which the cable 60 is used to connect the dc input terminal 25, in this embodiment, the circuit board 30 is fixed to the dc input terminal 25. In some embodiments, the DC power input terminals 25 are inserted into the openings 31 of the circuit board 30, and the ends of the DC power input terminals 25 are locked with fasteners 90 (e.g., screws), thereby locking and securing the circuit board 30 to the DC power input terminals 25.
As shown in fig. 4 and 5, the solar inverter 12 further includes a connection terminal 37, and the connection terminal 37 is disposed on the circuit board 30 and electrically connected to the dc input terminal 25 through an internal circuit 32 (shown in dashed lines) of the circuit board 30. Thus, current flows through the dc input terminal 25, the internal wiring 32 of the circuit board 30, and the connection terminal 37 in order. Connection terminals 37 may circumscribe cable 65 to carry current to other components of solar inverter 12, such as a direct current switch (DC switch). The arc detection coil 35 is disposed around the direct current input terminal 25 and the connection terminal 37 such that current from the direct current input terminal 25 passes through the arc detection coil 35. A portion of the arc detection coil 35 is also provided with a self-detection circuit 38 to provide self-detection of the arc detection coil 35 and the arc detection unit. In some embodiments, the spiral coil formed by the arc detection coil 35 on the circuit board is a closed rectangular ring, and the self-detection circuit 38 is disposed on a part of the closed ring. In some embodiments, the closed loop shape of the arc detection coil 35 may be circular, elliptical, square, triangular, etc. In some other embodiments, the spiral coil formed by the arc detection coil 35 on the circuit board may be a rectangular ring, a circular ring, an elliptical ring, a square ring, a triangular ring, or the like.
Please refer to fig. 6 and 7. The difference between this embodiment and the embodiment shown in fig. 2 is that the arc detection coil and the current sensor are disposed on different circuit boards. Specifically, in the present embodiment, the current sensor is disposed on the circuit board 30 (see fig. 2), the solar inverter further includes a circuit board 50, and the arc detection coil 56 and its self-detection circuit 58 are disposed on the circuit board 50. The circuit board 50 has an opening 53, and an arc detection coil 56 is disposed around the opening 53. The circuit board 50 is fitted over the cable 60 connected to the dc power input terminal 25, in other words, the cable 60 passes through the opening 53 of the circuit board 50 so that the arc detection coil 56 surrounds the cable 60. Thus, current from the dc input terminal 25 may pass through the arc detection coil 56 via the cable 60. A partial section of the arc detection coil 56 is provided with a self-detection circuit 58 to provide a self-detection function of the arc detection coil 56 and the arc detection unit.
Please refer to fig. 7 and 8. The difference between this embodiment and the embodiment shown in fig. 4 is that the arc detection coil and the current sensor are disposed on different circuit boards. Specifically, in the present embodiment, the current sensor is disposed on the circuit board 30 (see fig. 2), the solar inverter further includes the circuit board 50, and the arc detection coil 56 is disposed on the circuit board 50. The circuit board 50 has an opening 53, and an arc detection coil 56 is disposed around the opening 53. The circuit board 50 is sleeved on the cable 65 connected to the connection terminal 37 on the circuit board 30, in other words, the cable 65 passes through the opening 53 of the circuit board 50 so that the arc detection coil 56 surrounds the cable 65. Thus, current from the dc input terminal 25 may pass through the arc detection coil 56 via the cable 65.
Please refer to fig. 9. In the present embodiment, the current sensor (see fig. 2), the arc detection coil 56 and the self-detection circuit 58 are respectively disposed on the circuit boards 30 and 50, and the circuit board 50 is disposed between the circuit board 30 and the dc input terminal 25. The dc input terminal 25 is connected to the circuit board 30 through the cable 60, specifically, one end of the cable 60 is fixedly connected to the dc input terminal 25, extends through the opening 53 of the circuit board 50, and the other end is fixedly connected to the circuit board 30. The solar inverter further comprises an electrical connector 70, wherein the electrical connector 70 is connected to the circuit boards 30, 50 and is electrically connected to the arc detection coil 56 disposed around the opening 53 through the internal circuit 57 of the circuit board 50. The electrical connector 70 may include a plurality of pins, and the sensing signal generated by the arc detection coil 56 may be transmitted to the circuit board 30 through the internal circuit 57 of the circuit board 50 and the electrical connector 70.
In some embodiments, an arc detection unit (not shown) is disposed on the circuit board 30, and the sensing signal generated by the arc detection coil 56 is transmitted to the arc detection unit on the circuit board 30 through the electrical connector 70 for analysis. In other embodiments, the arc detection unit may be disposed on other circuit boards, and the sensing signal generated by the arc detection coil 56 is transmitted to the circuit board 30 through the electrical connector 70, and then transmitted to the arc detection unit disposed on other circuit boards through other lines for analysis. In some embodiments, a detection circuit controller (not shown) is disposed on the circuit board 30, and the detection circuit controller 15 injects a white noise or high frequency signal through the self-detection circuit 58 via the electrical connector 70 and the internal circuit 59 of the circuit board 50 to provide the self-detection function of the arc detection coil 56 and the arc detection unit.
Please refer to fig. 10. Unlike the embodiment shown in fig. 9, in this embodiment, the circuit board 30 is fixed to the dc input terminal 25 (for example, by fastening means 90 such as screws), and the circuit board 50 is located between the circuit board 30 and the wall surface of the housing 20 where the dc input terminal 25 is disposed, and is sleeved on the dc input terminal 25 (in other words, the dc input terminal 25 extends through the opening 53 of the circuit board 50). The circuit boards 30, 50 are connected by an electrical connector 70, and the electrical connector 70 is electrically connected to an arc detection coil 56 disposed around the opening 53 by an internal circuit 57 of the circuit board 50. A partial section of the arc detection coil 56 is provided with a self-detection circuit 58 to provide a self-detection function of the arc detection coil 56 and the arc detection unit.
Referring to FIG. 11, an enlarged partial cross-sectional view of a circuit board 30/50 is shown according to one embodiment of the present disclosure. The figure shows a cross-sectional view of a 6-layer (L1-L6) copper foil circuit board 30/50, which partially contains the aforementioned arc detection coil 35/56 and self-detection circuit 38/58. In this embodiment, the arc detection coil 35/56 is formed between layers L2 to L5 to form a spiral coil, and the self-detection circuit 38/58 is formed between layers L1 to L6 to form a spiral coil and surround a partial section of the arc detection coil. In this embodiment, the spiral coils of the arc detection coils 35/56 and the spiral coils of the self-detection circuits 38/58 are coaxial (e.g., both centered on the air axis AC). The self-detection circuit 38/58 is configured to inject a white noise or high frequency signal into the air-axis AC, thereby detecting whether the white noise or high frequency signal in the air-axis AC can be detected by the arc detection coil 35/56 to provide a self-detection function of the arc detection coil and the arc detection unit.
Referring to fig. 12, an enlarged partial cross-sectional view of a circuit board 30/50 according to another embodiment of the present disclosure is shown. Unlike the embodiment shown in fig. 11, in this embodiment, the arc detection coil 35/56 is formed between the layers L2 to L5 to form a spiral coil, and the self-detection circuit 38/58 is formed between the layers L3 to L4 to form a spiral coil and is located at the inner ring of a partial section of the arc detection coil. In this embodiment, the spiral coils of the arc detection coils 35/56 and the spiral coils of the self-detection circuits 38/58 are coaxial (e.g., both centered on the air axis AC). The self-detection circuit 38/58 is configured to inject a white noise or high frequency signal into the air-axis AC, thereby detecting whether the white noise or high frequency signal in the air-axis AC can be detected by the arc detection coil 35/56 to provide a self-detection function of the arc detection coil and the arc detection unit.
Referring to fig. 13, an enlarged partial cross-sectional view of a circuit board 30/50 according to yet another embodiment of the present disclosure is shown. Unlike the embodiments shown in fig. 11 and 12, in this embodiment, the circuit board 30/50 is a circuit board of only 4 layers (L1 to L4) of copper foil. The arc detection coil 35/56 is formed between layers L2 to L3 to form a spiral coil, and the self-detection circuit 38/58 is formed between layers L1 to L4 to form a spiral coil and to surround a partial section of the arc detection coil. In other embodiments, similar to the embodiment of FIG. 12, the arc detection coil 35/56 is formed between layers L1 through L4 to form a spiral coil, and the self-detection circuit 38/58 is formed between layers L2 through L3 to form a spiral coil and is located in the inner race of a partial segment of the arc detection coil.
In summary, unlike the existing solar inverter that uses an arc detection coil wound on a ring frame (core), the solar inverter of the present disclosure integrates the arc detection coil and the self-detection circuit on a circuit board, which is beneficial to saving cost and space, and can more conveniently perform arc detection and self-function detection for each solar string (string).
Although the present disclosure has been described with reference to the above embodiments, it should be understood that the present disclosure is not limited thereto, and that various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the present disclosure, and the scope of the present disclosure is defined by the appended claims.
Claims (14)
1. A solar inverter comprising:
a housing;
at least one circuit board arranged in the shell;
a current sensor disposed on the at least one circuit board;
an arc detection coil arranged on the at least one circuit board;
a self-detection circuit arranged on the at least one circuit board; and
at least one direct current input terminal is arranged on the shell and connected with the at least one circuit board, wherein the self-detection circuit is configured to transmit a test signal for induction of the arc detection coil, the direct current input terminal is configured to transmit a current through the arc detection coil, and the current sensor is configured to detect the magnitude of the current passing through the direct current input terminal.
2. The solar inverter of claim 1, wherein the at least one circuit board comprises a first circuit board, the current sensor, the self-detection circuit, and the arc detection coil are disposed on the first circuit board.
3. The solar inverter of claim 2, further comprising a cable connected to the dc input terminal, wherein the first circuit board has an opening through which the cable extends, the arc detection coil is disposed around the opening, and the self-detection circuit is disposed in a portion of the arc detection coil.
4. The solar inverter of claim 2, further comprising a connection terminal, wherein the first circuit board is fixed on the dc input terminal, the connection terminal is disposed on the first circuit board and electrically connected to the dc input terminal through an internal circuit of the first circuit board, and the arc detection coil is disposed around the dc input terminal and the connection terminal.
5. The solar inverter of claim 2, wherein the at least one dc input terminal is a plurality of dc input terminals, the first circuit board is configured to receive current from the dc input terminals and output current via at least one output terminal, wherein the number of the at least one output terminal is less than the number of the dc input terminals.
6. The solar inverter of claim 2, further comprising an electromagnetic interference suppression capacitor disposed on the first circuit board.
7. The solar inverter of claim 1, wherein the at least one circuit board comprises a first circuit board and a second circuit board, the current sensor is disposed on the first circuit board, the arc detection coil and the self-detection circuit are disposed on the second circuit board, and the self-detection circuit is disposed on a portion of the arc detection coil.
8. The solar inverter of claim 7, further comprising a cable connected to the dc input terminal and extending through the first circuit board, wherein the second circuit board is sleeved on the cable.
9. The solar inverter of claim 7, further comprising a connection terminal and a cable, wherein the first circuit board is fixed on the dc input terminal, the connection terminal is disposed on the first circuit board and is electrically connected to the dc input terminal through an internal circuit of the first circuit board, the cable is connected to the connection terminal, and the second circuit board is sleeved on the cable.
10. The solar inverter of claim 7, further comprising a cable connected between the dc input terminal and the first circuit board and passing through the second circuit board, and an electrical connector connected to the first circuit board and the second circuit board and electrically connected to the arc detection coil through an internal circuit of the second circuit board.
11. The solar inverter of claim 7, wherein the first circuit board is fixed on the dc input terminal, the second circuit board is located between the first circuit board and a wall surface of the housing and is sleeved on the dc input terminal, the solar inverter further comprises an electrical connector, and the electrical connector is connected with the first circuit board and the second circuit board and is electrically connected with the arc detection coil through an internal circuit of the second circuit board.
12. The solar inverter of claim 1, wherein the dc input terminal is configured to connect to a solar panel, the solar inverter further comprising an arc detection unit configured to receive a signal from the arc detection coil and to determine whether an arc fault has occurred in a line between the solar inverter and the solar panel based on the signal, wherein the solar inverter is configured to cease receiving energy from the solar panel when an arc fault has occurred.
13. The solar inverter of claim 1, wherein the arc detection coil is concentric with the spiral coil of the self-detection circuit formed on the at least one circuit board.
14. The solar inverter of claim 1, wherein the spiral coil of the arc detection coil formed on the at least one circuit board is a ring, and the self-detection circuit is disposed on a portion of the ring.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18/328,787 US20240055998A1 (en) | 2022-08-11 | 2023-06-05 | Photovoltaic inverter |
| EP23185363.1A EP4321886A1 (en) | 2022-08-11 | 2023-07-13 | Photovoltaic inverter |
| JP2023120494A JP2024025684A (en) | 2022-08-11 | 2023-07-25 | Photovoltaic inverter |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210963275 | 2022-08-11 | ||
| CN202210963275X | 2022-08-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117595682A true CN117595682A (en) | 2024-02-23 |
Family
ID=89850547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310161818.0A Pending CN117595682A (en) | 2022-08-11 | 2023-02-24 | Solar inverter |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN117595682A (en) |
| WO (1) | WO2024031960A1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3282532B1 (en) * | 2016-08-11 | 2021-06-02 | MARICI Holdings The Netherlands B.V. | An arc fault detection arrangement for a dc electric bus |
| US10573803B1 (en) * | 2018-08-21 | 2020-02-25 | Semiconductor Components Industries, Llc | Current sensor packages with through hole in semiconductor |
| KR101943400B1 (en) * | 2018-08-28 | 2019-01-30 | 주식회사 코본테크 | Instantaneous trip independency type ct device of pcb type for circuit breaker |
| CN215375643U (en) * | 2021-04-02 | 2021-12-31 | 阳光电源股份有限公司 | Arc detection sensor and arc detection circuit |
| CN114675101A (en) * | 2022-03-07 | 2022-06-28 | 福州大学 | Fault arc protection electrical appliance characteristic test method |
| CN114878996A (en) * | 2022-06-14 | 2022-08-09 | 江苏纳通能源技术有限公司 | Arc detection circuit with self-checking function, device and detection method |
-
2023
- 2023-02-24 CN CN202310161818.0A patent/CN117595682A/en active Pending
- 2023-02-24 WO PCT/CN2023/078111 patent/WO2024031960A1/en unknown
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| Publication number | Publication date |
|---|---|
| WO2024031960A1 (en) | 2024-02-15 |
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