Arc detection device and photovoltaic system

Abstract

The utility model provides an arc detection device and a photovoltaic system, the arc detection device comprises a signal output module, and the signal output module comprises an arc acquisition unit and an alarm output unit; a first input end and a second input end of the arc acquisition unit are respectively used for being electrically connected with a first terminal electrically connected with a photovoltaic panel and a second terminal electrically connected with an inverter in a photovoltaic system, and an output end of the arc acquisition unit is electrically connected with the alarm output unit. The signal acquisition unit is used for acquiring an initial arc signal between the first terminal and the second terminal and sending a processed target arc signal to the alarm output unit; and the alarm output unit is used for carrying out alarm output according to the accessed target arc signal. Compared with an existing mode based on current characteristics, the device does not need a complex algorithm, is not liable to be interfered by harmonic waves of an inverter, reduces the cost of an arc detection scheme, and improves the efficiency of the arc detection scheme.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, specifically to an arc detection device and a photovoltaic system. Background Technology

[0002] Fires in photovoltaic systems are often caused by unreliable connectors between the photovoltaic panels and the inverter, leading to excessive contact resistance, electric arcing, and ultimately, overheating and a fire.

[0003] Existing technologies typically detect the current characteristics in a circuit and analyze these characteristics to determine if an arc has occurred. However, this requires complex algorithms and is susceptible to harmonic interference generated by the inverter. Especially under high current conditions, the current characteristics corresponding to an arc can be submerged, making it impossible to identify the arc. Ultimately, this results in existing arc detection schemes based on current characteristics being both costly and inefficient. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides an arc detection device and a photovoltaic system.

[0005] In one embodiment, the present invention provides an arc detection device, which includes a signal output module, and the signal output module includes an arc acquisition unit and an alarm output unit.

[0006] The first and second input terminals of the arc acquisition unit are respectively used to connect to the first terminal electrically connected to the photovoltaic panel and the second terminal electrically connected to the inverter in the photovoltaic system. The output terminal of the arc acquisition unit is electrically connected to the alarm output unit to acquire the initial arc signal between the first and second terminals and send the processed target arc signal to the alarm output unit.

[0007] The alarm output unit is used to output an alarm based on the target arc signal received.

[0008] In one embodiment, the arc acquisition unit includes a power processing unit;

[0009] The power processing unit is used to receive the initial arc signal between the first terminal and the second terminal, use the initial arc signal as the initial power supply for power conversion processing, and output the processed target power supply to the alarm output unit, with the target power supply serving as the target arc signal.

[0010] The alarm output unit is used to power on the target power supply and output an alarm after power-on.

[0011] In one embodiment, the power processing unit includes a rectifier circuit and a voltage regulator circuit;

[0012] The first and second input terminals of the rectifier circuit are used to be electrically connected to the first and second terminals, respectively. The output terminal of the rectifier circuit is electrically connected to the voltage regulator circuit, and the output terminal of the voltage regulator circuit is electrically connected to the alarm output unit.

[0013] In one embodiment, the voltage regulator circuit includes a current-limiting resistor, a transistor, and a Zener diode;

[0014] The first end of the current-limiting resistor is electrically connected to the output terminal of the rectifier circuit and the collector of the transistor, respectively. The second end of the current-limiting resistor is electrically connected to the base of the transistor and the cathode of the Zener diode, respectively. The emitter of the transistor is electrically connected to the alarm output unit, and the anode of the Zener diode is used for grounding.

[0015] In one embodiment, the power processing unit further includes a boost circuit;

[0016] The input terminal of the boost circuit is electrically connected to the output terminal of the rectifier circuit, and the output terminal of the boost circuit is electrically connected to the input terminal of the voltage regulator circuit.

[0017] In one embodiment, the boost circuit includes an energy storage inductor, a boost controller, and a MOSFET;

[0018] The first end of the energy storage inductor is electrically connected to the output of the rectifier circuit and the power supply of the boost controller, respectively. The second end of the energy storage inductor is electrically connected to the drain of the MOSFET and the input of the voltage regulator circuit, respectively. The output of the boost controller is electrically connected to the gate of the MOSFET, and the source of the MOSFET is grounded.

[0019] In one embodiment, the alarm output unit includes a transmission control circuit and a signal transmission circuit;

[0020] The power supply terminal of the transmitting control circuit is electrically connected to the output terminal of the power processing unit, and the output terminal of the transmitting control circuit is electrically connected to the signal transmitting circuit.

[0021] The transmitting control circuit is used to send a control signal to the signal transmitting circuit after the target power supply is powered on, so that the signal transmitting circuit generates an alarm signal and outputs it.

[0022] In one embodiment, the arc acquisition unit includes an arc acquisition unit;

[0023] The arc acquisition unit is used to acquire the initial arc signal between the first terminal and the second terminal, compare the electrical parameters of the initial arc signal with the electrical parameter threshold, and output an alarm control signal to the alarm based on the comparison result. The alarm control signal serves as the target arc signal.

[0024] In one embodiment, the arc acquisition unit includes a rectifier circuit and a comparator circuit;

[0025] The first and second input terminals of the rectifier circuit are used to be electrically connected to the first and second terminals, respectively. The output terminal of the rectifier circuit is electrically connected to the input terminal of the comparator circuit, and the output terminal of the comparator circuit is electrically connected to the alarm output unit.

[0026] In one embodiment, the comparator circuit includes a first voltage divider resistor, a second voltage divider resistor, and a comparator;

[0027] The first end of the first voltage divider resistor is used to connect to the working voltage. The second end of the first voltage divider resistor is electrically connected to the inverting input of the comparator and the first end of the second voltage divider resistor, respectively. The second end of the second voltage divider resistor is used to ground. The non-inverting input of the comparator is electrically connected to the output of the rectifier circuit. The output of the comparator is electrically connected to the alarm output unit.

[0028] In one embodiment, the alarm output unit includes a transmission control circuit and a signal transmission circuit;

[0029] The power supply terminal of the transmitting control circuit is used to connect to the working voltage. The input terminal of the transmitting control circuit is electrically connected to the output terminal of the arc acquisition unit, and the output terminal of the transmitting control circuit is electrically connected to the signal transmitting circuit.

[0030] The transmitting control circuit is used to send a signal control signal to the signal transmitting circuit according to the incoming target arc signal, so that the signal transmitting circuit generates an alarm signal and outputs it.

[0031] In one embodiment, the signal transmitting circuit includes a wireless transmitting sub-circuit and an antenna;

[0032] The input terminal of the wireless transmitter sub-circuit is electrically connected to the output terminal of the transmitting control circuit, and the output terminal of the wireless transmitter sub-circuit is electrically connected to the antenna.

[0033] The wireless transmitter sub-circuit is used to generate radio frequency signals according to control signals and send them to the antenna so that the antenna can transmit electromagnetic wave signals according to the radio frequency signals.

[0034] In one embodiment, the signal transmitting circuit includes a carrier transmitting sub-circuit and a carrier coupling coil;

[0035] The input terminal of the carrier transmitting sub-circuit is electrically connected to the output terminal of the transmitting control circuit, and the output terminal of the carrier transmitting sub-circuit is connected to the carrier coupling coil;

[0036] The carrier transmitting sub-circuit is used to generate a carrier signal according to the control signal and send it to the carrier coupling coil so that the carrier coupling coil transmits the carrier signal.

[0037] In one embodiment, the arc detection device further includes a signal receiving module;

[0038] The signal receiving module is electrically connected to the alarm output unit and is used for alarm reception.

[0039] In one embodiment, the signal receiving module includes an alarm receiving unit and an execution control unit;

[0040] The alarm receiving unit is electrically connected to both the alarm output unit and the execution control unit, and is used to receive alarms and send alarm information to the execution control unit.

[0041] The execution control unit is used to perform alarm operations based on alarm information.

[0042] In one embodiment, the execution control unit includes a receiving control circuit and an execution unit;

[0043] The receiving control circuit is electrically connected to both the alarm receiving unit and the execution unit, and is used to control the execution unit to perform alarm operations based on the alarm information.

[0044] Secondly, in one embodiment, the present invention provides a photovoltaic system, the photovoltaic system including a photovoltaic panel, a first terminal electrically connected to the photovoltaic panel, an inverter, a second terminal electrically connected to the inverter, and an arc detection device as described in any of the above embodiments;

[0045] The photovoltaic panel is electrically connected to the inverter via the first and second terminals.

[0046] By using the aforementioned arc detection device and photovoltaic system, an arc acquisition unit and an alarm output unit are set up. The arc acquisition unit is directly electrically connected to the first and second terminals in the photovoltaic system, which function as connectors. This allows for the direct acquisition of the initial arc signal between the first and second terminals. After processing the initial arc signal, the arc acquisition unit sends the processed target arc signal to the alarm output unit, enabling the alarm output unit to output an alarm based on the target arc signal. This achieves the entire process of arc detection and alarm. Compared to existing current-characteristic-based methods, this invention eliminates the need for complex algorithms and is less susceptible to inverter harmonic interference, reducing the cost and improving the efficiency of the arc detection scheme. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of the structure of a photovoltaic system including a signal output module in one embodiment of the present invention;

[0049] Figure 2 This is a schematic diagram of the specific structure of the signal output module in one embodiment of the present invention;

[0050] Figure 3 This is a schematic diagram of the structure of the arc acquisition unit as a power processing unit in one embodiment of the present invention;

[0051] Figure 4 This is a schematic diagram of the power processing unit in one embodiment of the present invention;

[0052] Figure 5 This is a schematic diagram of a specific circuit including a boost circuit in one embodiment of the present invention;

[0053] Figure 6 This is a schematic diagram of the structure of the arc acquisition unit, specifically the arc acquisition unit, in one embodiment of the present invention;

[0054] Figure 7 This is a schematic diagram of the arc acquisition unit in one embodiment of the present invention;

[0055] Figure 8 This is a schematic diagram of the specific structure of an alarm output unit based on an antenna in one embodiment of the present invention;

[0056] Figure 9 This is a schematic diagram of the specific structure of an alarm output unit based on carrier wave in one embodiment of the present invention;

[0057] Figure 10 This is a schematic diagram of the structure of a photovoltaic system including a signal receiving module in one embodiment of the present invention;

[0058] Figure 11 This is a schematic diagram of the specific structure of a signal receiving module based on an antenna method in one embodiment of the present invention;

[0059] Figure 12 This is a schematic diagram of the specific structure of a carrier-based signal receiving module in one embodiment of the present invention;

[0060] Figure 13 This is a schematic diagram of the specific structure of a photovoltaic system based on carrier wave mode in one embodiment of the present invention. Detailed Implementation

[0061] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0062] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified. In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use this invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of this invention with unnecessary detail. Therefore, this invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0063] Firstly, such as Figure 1 As shown, in one embodiment, the present invention provides an arc detection device, which includes a signal output module.

[0064] Among them, such as Figure 2 As shown, the signal output module includes an arc acquisition unit and an alarm output unit.

[0065] Simultaneously refer to Figure 1 and Figure 2 The first and second input terminals of the arc acquisition unit are respectively used to connect to the first terminal electrically connected to the photovoltaic panel and the second terminal electrically connected to the inverter in the photovoltaic system. The output terminal of the arc acquisition unit is electrically connected to the alarm output unit and is used to acquire the initial arc signal between the first and second terminals and send the processed target arc signal to the alarm output unit.

[0066] When the first terminal and the second terminal are reliably connected, the contact resistance between the two terminals is essentially zero, and the voltage difference between the two terminals is essentially zero. Conversely, when the first terminal and the second terminal are not reliably connected, the contact resistance between the two terminals increases, the voltage between the two terminals increases, and an electric arc is generated between the two terminals. When an electric arc is generated between the first terminal and the second terminal, the arc acquisition unit can acquire the corresponding initial arc signal based on the voltage.

[0067] The arc acquisition unit can perform both voltage acquisition and comparison and power processing. The arc acquisition unit has different functions and can process different target arc signals to trigger the alarm function of the alarm output unit.

[0068] The alarm output unit is used to output an alarm based on the target arc signal received.

[0069] When the arc acquisition unit is used to realize the voltage acquisition and comparison function, the target arc signal received by the alarm output unit can be the comparison result that characterizes whether the voltage difference between the first terminal and the second terminal is too large. When the alarm output unit is connected to the comparison result, if the voltage difference it characterizes is too large, an alarm output will be performed.

[0070] When the arc acquisition unit is used to perform power processing, the target arc signal received by the alarm output unit can be a power supply used for power supply. When the alarm output unit is connected to the power supply, it is powered on and then outputs an alarm.

[0071] The aforementioned arc detection device includes an arc acquisition unit and an alarm output unit. The arc acquisition unit is directly electrically connected to the first and second terminals in the photovoltaic system, which function as connectors. This allows for the direct acquisition of the initial arc signal between the first and second terminals. After processing the initial arc signal, the arc acquisition unit sends the processed target arc signal to the alarm output unit, enabling the alarm output unit to output an alarm based on the target arc signal. This achieves the entire process of arc detection and alarm. Compared to existing current-characteristic-based methods, this invention eliminates the need for complex algorithms and is less susceptible to inverter harmonic interference, reducing the cost and improving the efficiency of the arc detection scheme.

[0072] like Figure 3 As shown, in one embodiment, the arc acquisition unit includes a power processing unit.

[0073] The power processing unit is used to receive the initial arc signal between the first terminal and the second terminal, use the initial arc signal as the initial power supply for power conversion processing, and output the processed target power supply VCC to the alarm output unit. The target power supply is used as the target arc signal.

[0074] The power processing unit directly uses the electric arc generated between the first and second terminals as its power source, and uses the energy of the electric arc to power the alarm output unit.

[0075] The alarm output unit is used to power on according to the target power supply VCC and output an alarm after power-on.

[0076] When no electric arc is generated, the power processing unit cannot output the target power supply VCC to the alarm output unit. Since the alarm output unit is not connected to any other power source in this embodiment, it remains in a dormant state. When an electric arc is generated, the power processing unit can output the target power supply VCC to the alarm output unit, causing it to switch from a dormant state to an active state, thus powering on and starting the alarm output unit. At this time, the alarm output unit can output an alarm.

[0077] Since the generation of the electric arc is basically synchronized with the power-on of the alarm output unit, it is only necessary to pre-set the alarm output unit to the mode of alarming upon power-on, so that the generation of the electric arc can be directly used as the trigger condition for the alarm.

[0078] In one embodiment, the power processing unit includes a rectifier circuit and a voltage regulator circuit, such as... Figure 4 As shown, the rectifier circuit includes a rectifier bridge D1, and the voltage regulator circuit includes a current-limiting resistor R1, a transistor Q1, and a Zener diode D2.

[0079] The first and second input terminals of rectifier bridge D1 are electrically connected to the first and second terminals, respectively. The first terminal of current-limiting resistor R1 is electrically connected to the first output terminal of rectifier bridge D1 and the collector of transistor Q1. The second terminal of current-limiting resistor R1 is electrically connected to the base of transistor Q1 and the cathode of Zener diode D2. The emitter of transistor Q1 is electrically connected to the alarm output unit to output the target power supply VCC. The anode of Zener diode D2 and the second output terminal of rectifier bridge D1 are used for grounding.

[0080] The rectifier bridge D1 is used to achieve AC / DC conversion. In other embodiments, other specific single devices or combinations of devices besides the rectifier bridge D1 can also be used to achieve the function of the rectifier circuit.

[0081] When the DC voltage output by rectifier bridge D1 is greater than the breakdown voltage of Zener diode D2, Zener diode D2 breaks down and conducts. At this time, the DC voltage output by rectifier bridge D1 goes to ground through current limiting resistor R1 and Zener diode D2. The base voltage of transistor Q1 is pulled low, and transistor Q1 is cut off, unable to output the target power supply VCC to the alarm output unit. In this process, current limiting resistor R1 is mainly used to limit the current flowing through Zener diode D2 to avoid damage to Zener diode D2.

[0082] Similarly, when the DC voltage output by rectifier bridge D1 is not greater than the breakdown voltage of Zener diode D2, Zener diode D2 is cut off. At this time, the DC voltage output by rectifier bridge D1 passes through current limiting resistor R1 to the base of transistor Q1. The base voltage of transistor Q1 is pulled high, transistor Q1 is turned on, and the target power supply VCC can be output to the alarm output unit.

[0083] In this embodiment, the voltage regulator circuit may further include a filter capacitor C3 and a filter capacitor C4, where the filter capacitor C4 is used for input-side filtering and the filter capacitor C3 is used for output-side filtering.

[0084] In other embodiments, other topologies can also be used to implement the function of the voltage regulator circuit.

[0085] In one embodiment, the power processing unit further includes a boost circuit, such as... Figure 5 As shown, the boost circuit includes an energy storage inductor L1, a boost controller, and a MOSFET Q2.

[0086] The first end of the energy storage inductor L1 is electrically connected to the first output end of the rectifier bridge D1 and the power supply end of the boost controller. The second end of the energy storage inductor L1 is electrically connected to the drain of the MOSFET Q2 and is electrically connected to the first end of the current limiting resistor R1 and the collector of the transistor Q1 through the rectifier diode D6. The output end of the boost controller is electrically connected to the gate of the MOSFET Q2, and the source of the MOSFET Q2 is grounded.

[0087] When the voltage generated by the electric arc is low, the switching on and off of the MOSFET Q2 can be controlled by the boost controller, thereby controlling the energy storage and release of the energy storage inductor L1, and ultimately achieving the purpose of boosting the voltage.

[0088] In other embodiments, other boost topologies can also be used to implement the function of the boost circuit.

[0089] like Figure 6 As shown, in one embodiment, the arc acquisition unit includes an arc acquisition unit.

[0090] The arc acquisition unit is used to acquire the initial arc signal between the first terminal and the second terminal, compare the electrical parameters of the initial arc signal with the electrical parameter threshold, and output the alarm control signal CTRL to the alarm output unit according to the comparison result. The alarm control signal CTRL is used as the target arc signal.

[0091] As mentioned in the above embodiments, when an electric arc occurs, the voltage difference between the first terminal and the second terminal increases. Therefore, in this embodiment, it is possible to determine whether an electric arc has occurred between the first terminal and the second terminal by detecting whether the voltage difference between them exceeds a voltage difference threshold. It should be noted that even when the connection between the first terminal and the second terminal is reliable, a very small voltage difference exists. Therefore, the voltage difference threshold in this embodiment needs to be greater than zero. That is, in this embodiment, the presence of an electric arc is not directly determined simply by detecting a voltage difference between the first terminal and the second terminal.

[0092] When no electric arc is generated, the arc acquisition unit outputs an alarm control signal CTRL indicating the absence of an electric arc to the alarm output unit. When an electric arc is generated, the arc acquisition unit outputs an alarm control signal CTRL indicating the presence of an electric arc to the alarm output unit.

[0093] It should be noted that in this embodiment, since the arc acquisition unit can only output the alarm control signal CTRL to the alarm output unit, the alarm output unit needs to be connected to another power source to ensure its normal operation.

[0094] In one embodiment, the arc acquisition unit includes a rectifier circuit and a comparator circuit, such as Figure 7 As shown, the rectifier circuit includes a rectifier bridge D1, and the comparator circuit includes a first voltage divider resistor R4, a second voltage divider resistor R5, and a comparator U1.

[0095] In this circuit, the first terminal of the first voltage divider resistor R4 is used to connect to the working voltage (such as the target power supply VCC; it should be noted that the target power supply VCC here can be output through the power processing unit in the above embodiment or directly connected elsewhere). The second terminal of the first voltage divider resistor R4 is electrically connected to the inverting input terminal of the comparator U1 and the first terminal of the second voltage divider resistor R5, respectively. The second terminal of the second voltage divider resistor R5 is used to ground. The first and second input terminals of the rectifier bridge D1 are electrically connected to the first terminal and the second terminal, respectively. The non-inverting input terminal of the comparator U1 is electrically connected to the first output terminal of the rectifier bridge D1. The second output terminal of the rectifier bridge D1 is used to ground. The output terminal of the comparator U1 is electrically connected to the alarm output unit to output the alarm control signal CTRL.

[0096] The first voltage divider resistor R4 and the second voltage divider resistor R5 are used to divide the input operating voltage to output a reference voltage to the inverting input terminal of comparator U1. By properly setting the voltage division ratio of the first voltage divider resistor R4 and the second voltage divider resistor R5, the comparator circuit can perform the following operations:

[0097] When an electric arc exists between the first and second terminals, the voltage output from rectifier bridge D1 to the non-inverting input of comparator U1 is greater than the reference voltage, and comparator U1 outputs a high-level alarm control signal CTRL. Similarly, when no electric arc exists between the first and second terminals, the voltage output from rectifier bridge D1 to the non-inverting input of comparator U1 is less than the reference voltage, and comparator U1 outputs a low-level alarm control signal CTRL.

[0098] In this embodiment, the comparison circuit may further include a filter capacitor C12. The filter capacitor C12 is used to filter the voltage output to the non-inverting input terminal of the comparator U1 to ensure the reliability of the comparison function, thereby improving the reliability of arc detection.

[0099] In other embodiments, other topologies may be used to compare the functionality of the voltage regulator circuit.

[0100] In one embodiment, the alarm output unit includes a transmission control circuit and a signal transmission circuit.

[0101] When the arc acquisition unit is specifically a power processing unit, the power supply terminal of the transmitting control circuit is electrically connected to the output terminal of the power processing unit. When the arc acquisition unit is specifically an arc acquisition unit, the power supply terminal of the transmitting control circuit is used to connect to the operating voltage, and the input terminal of the transmitting control circuit is electrically connected to the output terminal of the arc acquisition unit. Furthermore, regardless of whether the arc acquisition unit is specifically a power processing unit or an arc acquisition unit, the output terminal of the transmitting control circuit is electrically connected to the signal transmitting circuit.

[0102] When the arc acquisition unit is specifically a power processing unit, the sending control circuit is specifically used to send a control signal to the signal sending circuit after powering on according to the target power supply, so that the signal sending circuit generates an alarm signal and outputs it.

[0103] When the arc acquisition unit is specifically an arc acquisition unit, the sending control circuit is used to send a signal control signal to the signal sending circuit according to the target arc signal, so that the signal sending circuit generates an alarm signal and outputs it.

[0104] As can be seen from the above, regardless of whether the arc acquisition unit is specifically a power processing unit or an arc acquisition unit, the signal transmission circuit is used to generate and output an alarm signal under the control of the transmission control circuit.

[0105] like Figure 8 As shown, in one embodiment, the signal transmitting circuit includes a wireless transmitting sub-circuit and an antenna.

[0106] Taking the arc acquisition unit as a power processing unit as an example, the power supply terminal of the transmitting control circuit is electrically connected to the output terminal of the power processing unit through the energy storage capacitor C1 to access the target power supply VCC. The input terminal of the wireless transmitting sub-circuit is electrically connected to the output terminal of the transmitting control circuit, and the output terminal of the wireless transmitting sub-circuit is electrically connected to the antenna.

[0107] The wireless transmitter sub-circuit is used to send control signals according to the signal, generate radio frequency signals and send them to the antenna so that the antenna can send electromagnetic wave signals according to the radio frequency signals.

[0108] In this embodiment, the signal transmitting circuit is wireless, specifically using a wireless transmitting antenna. In other embodiments, the signal transmitting circuit can also be wired, for example, electrically connected to the corresponding signal receiving module via a PLC control line.

[0109] like Figure 9 As shown, in one embodiment, the signal transmitting circuit includes a carrier transmitting sub-circuit and a carrier coupling coil.

[0110] Taking the arc acquisition unit as a specific example of a power processing unit, the power supply terminal of the transmitting control circuit is electrically connected to the output terminal of the power processing unit through the energy storage capacitor C1 to access the target power supply VCC. The input terminal of the carrier transmitting sub-circuit is electrically connected to the output terminal of the transmitting control circuit, and the output terminal of the carrier transmitting sub-circuit is connected to the carrier coupling coil.

[0111] The carrier transmitting sub-circuit is used to generate a carrier signal according to the control signal and send it to the carrier coupling coil so that the carrier coupling coil transmits the carrier signal.

[0112] The similarity between this embodiment and the previous embodiment is that both use wireless means to achieve signal transmission; the difference is that this embodiment uses carrier wave to achieve wireless transmission.

[0113] The wireless transmission methods listed in the above embodiments can avoid the need for corresponding circuit wiring in photovoltaic systems, allowing the arc detection device to be applied to photovoltaic systems more flexibly.

[0114] like Figure 10 As shown, in one embodiment, the arc detection device further includes a signal receiving module.

[0115] The signal receiving module is electrically connected to the alarm output unit in the signal output module for receiving alarms.

[0116] The alarm signal can be transmitted wirelessly or via a wired connection between the signal receiving module and the signal output module.

[0117] When using a wireless method, if the signal output module uses an antenna, then the signal receiving module also needs to use an antenna; similarly, if the signal output module uses a carrier wave, then the signal receiving module also needs to use a carrier wave.

[0118] like Figure 11 As shown, when the signal receiving module adopts an antenna method, the signal receiving module specifically includes an antenna, a wireless receiving sub-circuit, a receiving control circuit, and an execution unit. The antenna and the wireless receiving sub-circuit constitute an alarm receiving unit, and the receiving control circuit and the execution unit constitute an execution control unit.

[0119] In this circuit, the antenna in the signal receiving module is electrically connected to the input terminal of the wireless receiving sub-circuit, the output terminal of the wireless receiving sub-circuit is electrically connected to the input terminal of the receiving control circuit, and the output terminal of the receiving control circuit is electrically connected to the execution unit.

[0120] The antenna in the signal receiving module is used to receive electromagnetic wave signals sent by the antenna in the signal output module and to send corresponding radio frequency signals to the wireless receiving sub-circuit.

[0121] The wireless receiver sub-circuit is used to feed back corresponding alarm information to the receiving control circuit based on the accessed radio frequency signal, so that the receiving control circuit can control the execution unit to perform corresponding operations based on the alarm information.

[0122] Under the control of the receiving control circuit, the execution unit can output sound, light, and digital signals. When outputting sound or light signals, it is used for alarm prompts. When outputting digital signals, it is used to send signals to the inverter for shutdown alarm processing, etc.

[0123] like Figure 12 As shown, when the signal receiving module adopts the carrier mode, the signal receiving module specifically includes a carrier coupling coil, a carrier receiving sub-circuit, a receiving control circuit, and an execution unit. The carrier coupling coil and the carrier receiving sub-circuit constitute an alarm receiving unit, and the receiving control circuit and the execution unit constitute an execution control unit.

[0124] In this circuit, the carrier coupling coil in the signal receiving module is electrically connected to the input terminal of the carrier receiving sub-circuit, the output terminal of the carrier receiving sub-circuit is electrically connected to the input terminal of the receiving control circuit, and the output terminal of the receiving control circuit is electrically connected to the execution unit.

[0125] The carrier coupling coil in the signal receiving module is used to receive the carrier signal sent by the carrier coupling coil in the signal output module and send the corresponding carrier signal to the carrier receiving sub-circuit.

[0126] The carrier receiving sub-circuit is used to feed back corresponding alarm information to the receiving control circuit based on the received carrier signal, so that the receiving control circuit can control the execution unit to perform corresponding operations based on the alarm information.

[0127] It is important to note that the carrier coupling coil in the signal output module and the carrier coupling coil in the signal receiving module pass through the same power line to achieve power line carrier communication. Specifically, for example... Figure 13 As shown, when the carrier mode is used, the carrier coupling coil corresponding to the signal output module and the carrier coupling coil corresponding to the signal receiving module pass through the DC power line located between the second terminal and the inverter in the photovoltaic system.

[0128] Secondly, such as Figure 1 , Figure 10 or Figure 13 As shown, in one embodiment, the present invention provides a photovoltaic system, which includes a photovoltaic panel, a first terminal electrically connected to the photovoltaic panel, an inverter, a second terminal electrically connected to the inverter, and an arc detection device as described in any of the above embodiments.

[0129] The photovoltaic panel is electrically connected to the inverter via the first and second terminals.

[0130] The arc detection device in the aforementioned photovoltaic system includes an arc acquisition unit and an alarm output unit. The arc acquisition unit is directly electrically connected to the first and second terminals in the photovoltaic system, which function as connectors. This allows for the direct acquisition of the initial arc signal between the first and second terminals. After processing the initial arc signal, the arc acquisition unit sends the processed target arc signal to the alarm output unit, enabling the alarm output unit to output an alarm based on the target arc signal. This achieves the entire process of arc detection and alarm. Compared to existing current-characteristic-based methods, this invention eliminates the need for complex algorithms and is less susceptible to inverter harmonic interference, reducing the cost and improving the efficiency of the arc detection scheme.

[0131] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the detailed descriptions of other embodiments above, which will not be repeated here.

[0132] The above provides a detailed description of the arc detection device and photovoltaic system provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

[0133] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. An arc detection device, characterized in that, The arc detection device includes a signal output module, which includes an arc acquisition unit and an alarm output unit. The first and second input terminals of the arc acquisition unit are respectively used to connect to the first terminal electrically connected to the photovoltaic panel and the second terminal electrically connected to the inverter in the photovoltaic system. The output terminal of the arc acquisition unit is electrically connected to the alarm output unit and is used to acquire the initial arc signal between the first terminal and the second terminal and send the processed target arc signal to the alarm output unit. The alarm output unit is used to output an alarm based on the incoming target arc signal.

2. The arc detection device according to claim 1, characterized in that, The arc acquisition unit includes a power processing unit; The power processing unit is used to receive the initial arc signal between the first terminal and the second terminal, use the initial arc signal as the initial power supply for power conversion processing, and output the processed target power supply to the alarm output unit, wherein the target power supply is used as the target arc signal. The alarm output unit is used to power on according to the target power supply and to output an alarm after power-on.

3. The arc detection device according to claim 2, characterized in that, The power processing unit includes a rectifier circuit and a voltage regulator circuit; The first and second input terminals of the rectifier circuit are respectively used to electrically connect to the first terminal and the second terminal, the output terminal of the rectifier circuit is electrically connected to the voltage regulator circuit, and the output terminal of the voltage regulator circuit is electrically connected to the alarm output unit.

4. The arc detection device according to claim 3, characterized in that, The voltage regulator circuit includes a current-limiting resistor, a transistor, and a Zener diode; The first end of the current-limiting resistor is electrically connected to the output terminal of the rectifier circuit and the collector of the transistor, the second end of the current-limiting resistor is electrically connected to the base of the transistor and the cathode of the Zener diode, the emitter of the transistor is electrically connected to the alarm output unit, and the anode of the Zener diode is used for grounding.

5. The arc detection device according to claim 3, characterized in that, The power processing unit also includes a boost circuit; The input terminal of the boost circuit is electrically connected to the output terminal of the rectifier circuit, and the output terminal of the boost circuit is electrically connected to the input terminal of the voltage regulator circuit.

6. The arc detection device according to claim 5, characterized in that, The boost circuit includes an energy storage inductor, a boost controller, and a MOSFET; The first end of the energy storage inductor is electrically connected to the output end of the rectifier circuit and the power supply end of the boost controller, respectively. The second end of the energy storage inductor is electrically connected to the drain of the MOS transistor and the input end of the voltage regulator circuit, respectively. The output end of the boost controller is electrically connected to the gate of the MOS transistor, and the source of the MOS transistor is grounded.

7. The arc detection device according to claim 2, characterized in that, The alarm output unit includes a transmission control circuit and a signal transmission circuit; The power supply terminal of the transmission control circuit is electrically connected to the output terminal of the power processing unit, and the output terminal of the transmission control circuit is electrically connected to the signal transmission circuit. The transmitting control circuit is used to send a control signal to the signal transmitting circuit after powering on according to the target power supply, so that the signal transmitting circuit generates an alarm signal and outputs it.

8. The arc detection device according to claim 1, characterized in that, The arc acquisition unit includes an arc acquisition unit; The arc acquisition unit is used to acquire the initial arc signal between the first terminal and the second terminal, compare the electrical parameters of the initial arc signal with the electrical parameter threshold, and output an alarm control signal to the alarm output unit according to the comparison result. The alarm control signal serves as the target arc signal.

9. The arc detection device according to claim 8, characterized in that, The arc acquisition unit includes a rectifier circuit and a comparator circuit; The first and second input terminals of the rectifier circuit are respectively used to electrically connect to the first terminal and the second terminal. The output terminal of the rectifier circuit is electrically connected to the input terminal of the comparator circuit, and the output terminal of the comparator circuit is electrically connected to the alarm output unit.

10. The arc detection device according to claim 9, characterized in that, The comparison circuit includes a first voltage divider resistor, a second voltage divider resistor, and a comparator; The first end of the first voltage divider resistor is used to connect to the working voltage. The second end of the first voltage divider resistor is electrically connected to the inverting input terminal of the comparator and the first end of the second voltage divider resistor, respectively. The second end of the second voltage divider resistor is used to ground. The non-inverting input terminal of the comparator is electrically connected to the output terminal of the rectifier circuit. The output terminal of the comparator is electrically connected to the alarm output unit.

11. The arc detection device according to claim 8, characterized in that, The alarm output unit includes a transmission control circuit and a signal transmission circuit; The power supply terminal of the transmitting control circuit is used to connect to the working voltage. The input terminal of the transmitting control circuit is electrically connected to the output terminal of the arc acquisition unit, and the output terminal of the transmitting control circuit is electrically connected to the signal transmitting circuit. The transmitting control circuit is used to send a transmitting control signal to the signal transmitting circuit according to the incoming target arc signal, so that the signal transmitting circuit generates an alarm signal and outputs it.

12. The arc detection device according to claim 7 or 11, characterized in that, The signal transmitting circuit includes a wireless transmitting sub-circuit and an antenna; The input terminal of the wireless transmitting sub-circuit is electrically connected to the output terminal of the transmitting control circuit, and the output terminal of the wireless transmitting sub-circuit is electrically connected to the antenna. The wireless transmitter sub-circuit is used to generate a radio frequency signal according to the control signal and send it to the antenna so that the antenna transmits an electromagnetic wave signal according to the radio frequency signal.

13. The arc detection device according to claim 7 or 11, characterized in that, The signal transmitting circuit includes a carrier transmitting sub-circuit and a carrier coupling coil; The input terminal of the carrier transmitting sub-circuit is electrically connected to the output terminal of the transmitting control circuit, and the output terminal of the carrier transmitting sub-circuit is connected to the carrier coupling coil; The carrier transmitting sub-circuit is used to generate a carrier signal according to the control signal and send it to the carrier coupling coil so that the carrier coupling coil transmits the carrier signal.

14. The arc detection device according to claim 1, characterized in that, The arc detection device also includes a signal receiving module; The signal receiving module is electrically connected to the alarm output unit and is used for receiving alarms.

15. The arc detection device according to claim 14, characterized in that, The signal receiving module includes an alarm receiving unit and an execution control unit; The alarm receiving unit is electrically connected to the alarm output unit and the execution control unit respectively, and is used to receive alarms and send alarm information to the execution control unit. The execution control unit is used to perform alarm operations based on the alarm information.

16. The arc detection device according to claim 15, characterized in that, The execution control unit includes a receiving control circuit and an execution unit; The receiving control circuit is electrically connected to the alarm receiving unit and the execution unit respectively, and is used to control the execution unit to perform alarm operations according to the alarm information.

17. A photovoltaic system, characterized in that, The photovoltaic system includes a photovoltaic panel, a first terminal electrically connected to the photovoltaic panel, an inverter, a second terminal electrically connected to the inverter, and an arc detection device as described in any one of claims 1 to 16; The photovoltaic panel is electrically connected to the inverter via the first terminal and the second terminal.

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