Early warning device and photovoltaic system

Abstract

The utility model provides an early warning device and a photovoltaic system. The early warning device comprises a terminal detection module and a signal processing module. The terminal detection module is used for electrically connecting a positive terminal and a negative terminal of the photovoltaic module and detecting the temperature of the positive terminal and / or the negative terminal. And the signal processing module is in signal connection with the terminal detection module and is used for receiving the temperature information sent by the terminal detection module and sending out an early warning signal according to the temperature information. The terminal detection module is used for detecting the temperatures of the positive terminal and the negative terminal of the photovoltaic module respectively, the detected temperature information is sent to the signal processing module, the signal processing module sends out the early warning information according to the temperature information, early warning of abnormal work of the photovoltaic system is achieved, and the effect of early warning and prevention in advance is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic systems, and in particular to a warning device and a photovoltaic system. BACKGROUND

[0002] In a household photovoltaic system, when a photovoltaic panel catches fire, the main switch needs to be actively closed and turned off before rescue. This method is mainly a remedial method after property loss has occurred, and cannot maximize the maintenance of user property safety. CONTENT OF THE INVENTION

[0003] Therefore, the present application provides a warning device and a photovoltaic system to improve the problem that the current photovoltaic system uses a post-remedial method after a fire, which cannot maximize the maintenance of property safety.

[0004] The technical scheme adopted by the present application to solve the above technical problems is as follows:

[0005] In a first aspect, an embodiment of the present application provides a warning device, comprising:

[0006] a terminal detection module, configured to electrically connect a positive terminal and a negative terminal of a photovoltaic module, and detect the temperature of the positive terminal and / or the negative terminal; and

[0007] a signal processing module, connected to the terminal detection module, configured to receive temperature information from the terminal detection module, and send a warning signal according to the temperature information.

[0008] Optionally, the terminal detection module comprises a plurality of input connectors and a plurality of first temperature detection modules, the plurality of input connectors are configured to electrically connect a plurality of terminals of the photovoltaic module, and each input connector is electrically connected to a first temperature detection module, so as to detect the temperature of the terminal through the first temperature detection module.

[0009] Optionally, the terminal detection module further comprises a plurality of output connectors and a plurality of second temperature detection modules, each output connector is electrically connected to a second temperature detection module, so as to detect the temperature of the output connector through the second temperature detection module.

[0010] Optionally, the terminal detection module further comprises a first power module and a first control module, the first control module is electrically connected to the first power module, the first temperature detection module, and the second temperature detection module.

[0011] Optionally, the terminal detection module further comprises a voltage detection module, the voltage detection module is configured to electrically connect to the positive terminal and the negative terminal of the photovoltaic module to obtain the voltage of the photovoltaic module, and the voltage detection module is electrically connected to the first control module.

[0012] Optionally, the terminal detection module further comprises a signal sending module, the signal sending module being electrically connected with the first control module, and the signal sending module being further signal connected with the signal processing module to send temperature information from the temperature detection module to the signal processing module.

[0013] Optionally, the signal processing module comprises a signal receiving module, a second control module and a communication module, the signal receiving module being signal connected with the terminal detection module and the second control module, and the second control module being further signal connected with the communication module, and the communication module being used for signal connection with a terminal device.

[0014] Optionally, the signal processing module further comprises a current detection module, the current detection module being used for detecting current of the photovoltaic module and being electrically connected with the second control module to obtain current information of the photovoltaic module and transmit the current information to the second control module.

[0015] Optionally, a plurality of terminal detection modules are provided, and the plurality of terminal detection modules are electrically connected with a plurality of photovoltaic modules one by one, and the plurality of terminal detection modules are connected in series or in parallel.

[0016] Optionally, each terminal detection module is further used for sending an encoding information to the signal processing module, and the encoding information sent by different terminal detection modules is different.

[0017] In a second aspect, the present application provides a photovoltaic system, comprising:

[0018] a photovoltaic module;

[0019] The early warning device as described in the first aspect is electrically connected with the positive terminal and the negative terminal of the photovoltaic module, and is used for detecting temperature of the positive terminal and the negative terminal, and sending an early warning signal according to the temperature.

[0020] Optionally, the photovoltaic system further comprises an inverter, the inverter being electrically connected with an output end of the early warning device to control the photovoltaic module to stop running according to the early warning signal.

[0021] In summary, due to the adoption of the above technical solutions, the present application at least includes the following beneficial effects:

[0022] The embodiment of the present application provides a pre-warning device and a photovoltaic system, the temperature of the positive terminal and the negative terminal of a photovoltaic module is detected by using a terminal detection module, and the detected temperature information is sent to a signal processing module, the signal processing module sends pre-warning information according to the temperature information, the pre-warning of abnormal work of the photovoltaic system is realized, the function of early pre-warning prevention is played, compared with the active closing of a breaker for rescue after the photovoltaic panel is on fire in the traditional technology, the safety of photovoltaic module operation can be improved, and property safety is protected to a greater extent, and property loss is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A structural schematic diagram of a photovoltaic system is provided for the embodiment of the present application.

[0024] Figure 2 A structural schematic diagram of a pre-warning device is provided for the embodiment of the present application.

[0025] Figure 3 A structural schematic diagram of a terminal detection module in a pre-warning device is provided for the embodiment of the present application.

[0026] Figure 4 A structural schematic diagram of a signal processing module in a pre-warning device is provided for the embodiment of the present application.

[0027] Figure 5 A circuit schematic diagram of a control module in a pre-warning device is provided for the embodiment of the present application.

[0028] Figure 6 A circuit schematic diagram of a current detection module in a pre-warning device is provided for the embodiment of the present application.

[0029] Figure 7 A circuit schematic diagram of a voltage detection module in a pre-warning device is provided for the embodiment of the present application.

[0030] Figure 8 A circuit schematic diagram of a power module in a pre-warning device is provided for the embodiment of the present application.

[0031] Figure 9 A circuit schematic diagram of a signal sending module in a pre-warning device is provided for the embodiment of the present application.

[0032] Figure 10 A circuit schematic diagram of a signal receiving module in a pre-warning device is provided for the embodiment of the present application.

[0033] REFERENCE SIGNS:

[0034] 1, terminal detection module; 11, input terminal; 12, output terminal; 13, first temperature detection module; 14, second temperature detection module; 15, first power module; 16, first control module; 17, voltage detection module; 18, signal sending module; 2, signal processing module; 21, signal receiving module; 22, second control module; 23, communication module; 24, current detection module; 25, second power module; 3, photovoltaic assembly; 31, photovoltaic panel; 32, bypass diode; 4, inverter. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

[0036] In the description of the present application, it should be understood that the words "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0037] In the present application, the word "exemplary" is used to mean "serving as an example, instance, or illustration". Any embodiment described as "exemplary" in the present application is not necessarily to be construed as preferred or advantageous over other embodiments.

[0038] Please refer to Figure 1 The embodiments of the present application provide a photovoltaic system, which comprises a photovoltaic assembly 3 and a warning device. The photovoltaic assembly 3 is used to convert solar energy into electric energy. The warning device is electrically connected with the positive and negative terminals of the photovoltaic assembly 3, used to detect the temperature information of the positive and negative terminals, and send a warning signal according to the temperature information. When the detected temperature information is greater than a preset temperature threshold, the warning device will send a warning signal, and the user can take corresponding measures in time after receiving the warning signal.

[0039] Further, the photovoltaic assembly 3 comprises a photovoltaic panel 31 and a plurality of bypass diodes 32, the plurality of bypass diodes 32 are connected in series to form a diode group, and then the diode group is connected in parallel with the photovoltaic panel 31. When a part of the photovoltaic panel 31 appears hot spot effect, the bypass diode 32 is turned on, so that the current bypasses the part of the photovoltaic panel 31 that appears fault, avoiding local overheating to cause fire. And although part of the current flows through the bypass diode 32, which will cause the voltage to decrease partially, but at least the safe operation of the photovoltaic panel 31 can be ensured.

[0040] In some embodiments, the photovoltaic system further comprises an inverter 4, which is electrically connected with the output end of the early warning device to control the photovoltaic module 3 to stop running according to the early warning signal. By connecting the inverter 4 and the early warning device, the early warning device is endowed with the function of directly disconnecting the inverter 4 and stopping the photovoltaic module 3 from running according to the temperature information, which is mainly applicable to the case that there is not enough time to wait for the user to process after receiving the early warning signal in some emergency situations.

[0041] In some embodiments, referring to Figure 1 and Figure 2 , the early warning device comprises a terminal detection module 1 and a signal processing module 2. The terminal detection module 1 is used to electrically connect the positive terminal and the negative terminal of the photovoltaic module 3 to detect the temperature of the positive terminal and the negative terminal. The signal processing module 2 is signal connected with the terminal detection module 1 and is used to send the early warning signal according to the temperature information.

[0042] The technical scheme provided in the present application detects the temperature of the positive terminal and the negative terminal of the photovoltaic module 3 by using the terminal detection module 1 respectively, and sends the detected temperature information to the signal processing module 2, and the signal processing module 2 sends the early warning information according to the temperature information, which realizes the early warning of the abnormal working of the photovoltaic system, plays a role of early warning and prevention, and compared with the traditional technology of actively closing the breaker to rescue after the photovoltaic panel 31 catches fire, can improve the safety of the operation of the photovoltaic module 3, and protect the property safety to a greater extent and reduce the property loss.

[0043] In some embodiments, referring to Figure 3 , the terminal detection module 1 comprises a plurality of input joints 11 and a plurality of first temperature detection modules 13. The plurality of input joints 11 are used to be electrically connected with a plurality of terminals of the photovoltaic module, each input joint 11 is electrically connected with one first temperature detection module 13 to detect the temperature of the terminal by the first temperature detection module 13. It should be noted that the plurality indicates the quantity relationship of two or more than two. In the present embodiment, the input joint 11 is two, and the first temperature detection module 13 is also two. The two input joints 11 are used to be electrically connected with the positive terminal and the negative terminal of the photovoltaic module 3 to form a loop between the photovoltaic module 3 and the terminal detection module 1. Each input joint 11 is electrically connected with one first temperature detection module 13 to detect the temperature of the positive terminal and the negative terminal. By arranging the first temperature detection module 13 at the two input joints 11, the temperature at the two input joints 11 can be obtained in real time. Since the two input joints 11 are electrically connected with the positive terminal and the negative terminal of the photovoltaic module 3 respectively, the temperature detection of the positive terminal and the negative terminal is realized.

[0044] Further, the terminal detection module 1 further comprises a plurality of output terminals 12 and a plurality of second temperature detection modules 14, each output terminal 12 is electrically connected with one second temperature detection module 14 to detect the temperature of the output terminal 12. The output terminal 12 is used to connect external devices, such as connecting loads, when the load is connected, the second temperature detection module 14 can monitor the temperature of the current output terminal 12 in real time.

[0045] It should be noted that one of the reasons for the fire of the photovoltaic system is that the contact resistance of the wire harness terminal becomes large due to poor contact, which causes the local temperature to be too high over a long period of time, resulting in a fire hazard. Therefore, in the foregoing embodiments, the temperature detection module is used to detect the temperature of the input terminal 11 and the output terminal 12 to prevent the temperature from being too high due to poor contact of the wire harness terminal.

[0046] In some embodiments, referring to Figure 3 , the terminal detection module 1 further comprises a first power module 15 and a first control module 16. The first control module 16 is electrically connected with the first power module 15, the first temperature detection module 13 and the second temperature detection module 14. The first power module 15 is used to convert the photovoltaic voltage into a voltage that can be used by the terminal detection module 1 to realize power supply for the terminal detection module 1. The first control module 16 can effectively read the temperature detected by the first temperature detection module 13 and the second temperature detection module 14 by being electrically connected with the first temperature detection module 13 and the second temperature detection module 14.

[0047] Further, the terminal detection module 1 further comprises a voltage detection module 17, which is used to be electrically connected with the positive terminal and the negative terminal of the photovoltaic module 3 to obtain the voltage of the photovoltaic module 3. The voltage detection module 17 is electrically connected with the first control module 16 to send the detected voltage information to the first control module 16. It should be noted that the voltage detected by the voltage detection module 17 is the voltage that has not been processed by the first power module 15, that is, the voltage originally output by the photovoltaic module 3.

[0048] In some embodiments, referring to Figure 3 , the terminal detection module 1 further comprises a signal sending module 18. The input end of the signal sending module 18 is electrically connected with the output end of the first control module 16, so that the information obtained by the first control module 16, such as temperature information and voltage information, can be transmitted to the signal sending module 18. The signal sending module 18 is also signal connected with the signal processing module 2, which is used to send the temperature information from the temperature detection module to the signal processing module 2, and send the voltage information from the voltage detection module 17 to the signal processing module 2.

[0049] In some embodiments, referring to Figure 4The signal processing module 2 comprises a signal receiving module 21, a second control module 22 and a communication module 23. The signal receiving module 21 is electrically connected with the terminal detection module 1 and the second control module 22, so that the information detected by the terminal detection module 1, such as temperature information and voltage information, can be transmitted to the second control module 22 through the signal receiving module 21. After receiving the temperature information and the voltage information, the second control module 22 compares the temperature information with a preset temperature threshold and compares the voltage information with a preset voltage threshold. If the temperature reflected by the temperature information is greater than the preset temperature threshold, it means that the wire harness terminal may be in poor contact at this time, and the second control module 22 will generate information for notifying the user to handle. Similarly, according to the relationship between the voltage information and the preset voltage threshold, it can also be judged whether the working condition of the photovoltaic module 3 is normal at this time. The second control module 22 is also signal connected with the communication module 23, and the communication module 23 is used for signal connection with an external terminal device, so that the result information obtained by the second control module 22 according to the obtained information can be transmitted to the external terminal device through the communication module 23. The external terminal device can be a computer, a mobile phone or the like, so that the user can directly observe the current temperature condition and voltage condition and take corresponding measures.

[0050] In some embodiments, referring to Figure 4 The signal processing module 2 further comprises a current detection module 24. The current detection module 24 is connected in the loop of the photovoltaic module 3 or connected in the loop of the photovoltaic module 3 and the early warning device, for detecting the current of the photovoltaic module 3 and electrically connected with the second control module 22, so as to obtain the current information of the photovoltaic module 3 and transmit it to the second control module 22. By detecting the current by using the current detection module 24 and detecting the voltage by using the voltage detection module 17, the second control unit can calculate the running power of the current photovoltaic module 3 according to the current information and the voltage information, so as to more directly know the running state of the current photovoltaic module 3, and also can send the information to the user through the communication module 23, so that the user can perform the statistics of the power generation data.

[0051] In some embodiments, referring to Figure 4 The signal processing module 2 further comprises a second power module 25, and the input end of the second power module 25 is connected with an external power supply and the output end is electrically connected with the second control module 22, so as to provide electric energy for the second control module 22. In other embodiments, the second power module 25 can also be directly connected with the external power supply, that is, the external power supply is directly connected with the second control module 22 to provide electric energy.

[0052] In some embodiments, the terminal detection module 1 is provided in plurality, and is electrically connected to the plurality of photovoltaic modules 3 one by one, so that each terminal detection module 1 can detect the temperature of the photovoltaic module 3 connected thereto, to ensure that all photovoltaic modules 3 can discover the abnormal temperature as early as possible before a fire occurs, to complete the abnormal processing protection before property loss. The output ends of the plurality of terminal detection modules 1 are connected in series or in parallel to the signal processing module 2. In the present embodiment, whether the output ends of the plurality of terminal detection modules 1 are connected in series or in parallel to the signal processing module 2 is not limited, as long as the information obtained by the terminal detection module 1 can be transmitted to the signal processing module 2.

[0053] Further, each terminal detection module 1 is also used to send an encoded information to the signal processing module 2, and the encoded information sent by different terminal detection modules 1 is different, so that the signal processing module 2 can accurately determine which terminal detection module 1 the current received temperature information and voltage information come from, to realize the accurate positioning of the plurality of terminal detection modules 1. When the temperature at the input terminal and / or output terminal of a photovoltaic module 3 is too high, the terminal detection module 1 corresponding to the photovoltaic module 3 sends the temperature and encoded information to the signal processing module 2, so that the signal processing module 2 can obtain which photovoltaic module 3 has the temperature too high result, to facilitate the user to timely and accurately process, to reduce the process of the user to check the connection and working condition of the photovoltaic module 3 one by one, and to improve the efficiency of timely processing.

[0054] Exemplarily, the first control module and the second control module used in the above embodiments are existing chips, for example, the first control module and the second control module can adopt an existing single-chip microcomputer chip, for example, a low-power microcontroller, and the model can be N32L403KBQ7. The first power module adopts a direct-current step-down circuit to convert high voltage into low voltage of 3.3V for use by the first control module. The current detection module is an alternating current detection and zero-crossing detection circuit, mainly used for real-time monitoring of the current value of the photovoltaic panel, and combined with zero-crossing detection to realize phase synchronization or power calculation. The voltage detection module is a voltage dividing circuit combined with an RC low-pass filter circuit, used for signal conditioning of the input voltage to ensure that the signal meets the input requirements of the ADC (analog-to-digital converter). The signal sending module is a signal sending based on the UART communication protocol, suitable for serial communication of single-chip microcomputers, sensors or other devices, and is adapted to the interface of the aforementioned single-chip microcomputer N32L403KBQ7. The signal receiving module also receives signals based on the UART communication protocol, suitable for serial communication of single-chip microcomputers, sensors or other devices. The communication module is a 3.3V-powered UART communication module, used for serial data transmission function. The temperature detection module is a temperature sensor signal conditioning circuit, used for converting temperature changes into measurable voltage signals, and the core is a thermistor whose resistance value can change with temperature, thereby realizing temperature detection.

[0055] Please refer to Figures 5 to 10 , the detailed circuit structure of the control module, the current detection module, the voltage detection module, the power module, the signal sending module and the signal receiving module in the specific embodiments will be introduced as follows:

[0056] Please refer to Figure 5, the chip model of the control module is selected as N32L403KBQ7, and of course, other models of chips can also be selected in other examples, without limitation. In the embodiment, the circuit structure of the control module includes: power supply pins VDD, VSS and VDDA (analog power supply), VDD is 3.3V power supply, and VSS is grounded. Capacitors C8, C9, C10, C14, C15 are used to play a decoupling filtering role, resistors R10 and R12 are used for current limiting protection, and capacitors C8, C9, C10, C14, C15 and resistors R10, R12 together constitute a filter circuit. Through multi-stage capacitor parallel connection, such as capacitor C8, C9 filters VDD, capacitor C10 filters VDDA, eliminates high-frequency noise, and ensures stable operation of the chip. Resistor R12 and capacitor C12 constitute an RC filter network for noise suppression of UART communication signals (UART_RX / UART_TX). The temperature sensor interface TEMP SENSE1-TEMP SENSE4 is connected to the chip PA3-PA6 pin. Four-way temperature sensor signals are input through PA3-PA6 pins and converted to digital signals by internal ADC. The UART communication module receives external instructions and uploads temperature data.

[0057] See Figure 6 In the embodiment, the current detection module is a differential current sensor chip, which is used to convert the current signal flowing through IP+ / IP- into a linear voltage output. The IP+ pin is a high-precision current detection input terminal, and the IP- pin is a high-precision current detection output terminal, which are connected in series in the measured current loop, i.e. PH_A2_IN and PH_A2_OUT in the drawing. The OUT pin is an analog voltage output terminal after current detection, and the output signal has a linear relationship with the current flowing through IP+ / IP-. The VZCR pin is a zero point calibration or reference voltage pin. Capacitor C16 is used for power supply filtering to eliminate high-frequency noise of 3.3V power supply. Resistor R15 and capacitor C18 constitute an RC low-pass filter network to suppress high-frequency interference output by the OUT pin. PH_A2_IN / PH_A2_OUT is the input / output interface of the current detection main loop, which is connected in series in the current path of the photovoltaic module. The measured current PH_A2_IN flows in through the IP+ pin, flows into the internal Hall element or sampling resistor of the chip, and then flows to PH_A2_OUT through the IP- pin, forming a complete loop. The chip realizes current-voltage conversion through magnetic field induction (Hall effect) or voltage drop measurement (sampling resistor) without disconnecting the original circuit. If the VZCR pin is enabled, the zero point offset voltage can be adjusted through an external resistance network to compensate for errors caused by environmental temperature or electromagnetic interference.

[0058] See Figure 7The voltage detection module includes an input interface Vin, an output interface ADC_V, resistors R11 and R14, and capacitor C13. The input interface Vin is the input terminal for the high-voltage signal to be measured, such as the DC bus voltage of a photovoltaic module. Resistor R11 is the high-voltage side current-limiting resistor, responsible for the main voltage division. Resistor R14 is the low-voltage side sampling resistor; resistors R14 and R11 form a voltage divider network. Capacitor C13 is connected in parallel across resistor R14, forming an RC low-pass filter to suppress high-frequency noise interference. The output interface ADC_V outputs the filtered analog voltage signal to the input pin of the control module, and the actual value of the input interface Vin is calculated using a software algorithm.

[0059] Please see Figure 8 The power module includes an input port INPUT, a rectifier diode D1, a capacitor C1, a chip U1, VIN pin, EN pin, SW pin, FB pin, RT pin, PG pin, inductor L1, capacitors C2 and C3, resistors R5, R6, and R9. The input port INPUT connects to an external DC power supply, such as 12-24V, labeled Vin. Rectifier diode D1 provides reverse connection protection, preventing damage to the circuit from reversed input power polarity. Rectifier diode D1 can be a Schottky diode, featuring low forward voltage drop and high current withstand capability. Capacitor C1 is a 10μF-100μF electrolytic capacitor, filtering out high-frequency noise and transient interference from the input voltage. Chip U1 serves as the core of the DC-DC buck control, employing a synchronous buck controller, such as the MP2315 or LM2676, with an integrated MOSFET driver. The VIN pin is the positive input power terminal, and the EN pin is the enable control terminal, with the start / stop threshold set via a voltage divider between resistors R7 and R8. The SW pin is the switching node output, connected to inductor L1. The FB pin is the feedback input, where the output voltage is adjusted via a resistor divider network (resistors R5, R6, and R9). The RT pin is used to connect an external timing resistor to set the switching frequency; for example, a 100kΩ resistor results in a frequency of 500kHz. The PG pin is used to connect the power-ready signal, indicating whether the output voltage is stable. Inductor L1 is typically 10-47μH, used for energy storage and smoothing the switching waveform. Capacitor C2 is a low-ESR ceramic capacitor, such as 10μF / 25V, used to filter high-frequency switching noise, and capacitor C3 is an electrolytic capacitor, such as 100μF / 16V, used to suppress low-frequency ripple.

[0060] Please see Figure 9The signal transmission module includes a signal transmission chip, a transmitting UART_TX terminal, a receiving UART_RX terminal, a power supply, and a capacitor C11. The signal transmission chip can be a UART communication controller or a serial transceiver chip, such as a chip with signals like MAX3232 or CP2102, responsible for converting logic signals into a serial data stream conforming to the UART protocol. The transmitting UART_TX terminal is used to output serial data, and the receiving UART_RX terminal is used to receive commands or data from external devices. The power supply is connected to a 3.3V power source, and capacitor C11 is connected in parallel between the power supply and ground to filter out high-frequency noise and stabilize the power supply voltage.

[0061] Please see Figure 10 The signal receiving module includes a signal receiving chip, a transmitting UART_TX terminal, a receiving UART_RX terminal, a power supply, and a capacitor C17. The signal receiving chip can be a UART communication controller or a serial transceiver chip, such as a chip with signals like MAX3232 or CP2102, responsible for converting logic signals into a serial data stream conforming to the UART protocol. The transmitting UART_TX terminal is used to output serial data, and the receiving UART_RX terminal is used to receive commands or data from external devices. The power supply is connected to a 3.3V power source, and capacitor C17 is connected in parallel between the power supply and ground to filter out high-frequency noise and stabilize the power supply voltage.

[0062] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0063] Similarly, it should be noted that, in order to simplify the description of the embodiments of this application and thus aid in the understanding of one or more embodiments, the foregoing description of the embodiments of this application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of this application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

Claims

1. An early warning device, characterized in that, include: A terminal detection module is used to electrically connect the positive and negative terminals of a photovoltaic module and detect the temperature of the positive and / or negative terminals. as well as The signal processing module is connected to the terminal detection module and is used to receive temperature information from the terminal detection module and issue a warning signal based on the temperature information.

2. The early warning device as described in claim 1, characterized in that, The terminal detection module includes multiple input connectors and multiple first temperature detection modules. The multiple input connectors are used to electrically connect to multiple terminals of the photovoltaic module, and each input connector is electrically connected to one of the first temperature detection modules to detect the temperature of the terminal.

3. The early warning device as described in claim 2, characterized in that, The terminal detection module also includes multiple output connectors and multiple second temperature detection modules. Each output connector is electrically connected to a second temperature detection module to detect the temperature of the output connector through the second temperature detection module.

4. The early warning device as described in claim 3, characterized in that, The terminal detection module further includes a first power module and a first control module, wherein the first control module is electrically connected to the first power module, the first temperature detection module and the second temperature detection module.

5. The early warning device as described in claim 4, characterized in that, The terminal detection module further includes a voltage detection module, which is used to electrically connect to the positive and negative terminals of the photovoltaic module to obtain the voltage of the photovoltaic module. The voltage detection module is electrically connected to the first control module.

6. The early warning device as described in claim 4, characterized in that, The terminal detection module further includes a signal transmission module, which is electrically connected to the first control module and also signal-connected to the signal processing module to send temperature information from the temperature detection module to the signal processing module.

7. The early warning device as described in claim 1, characterized in that, The signal processing module includes a signal receiving module, a second control module, and a communication module. The signal receiving module is signal-connected to both the terminal detection module and the second control module. The second control module is also signal-connected to the communication module. The communication module is used for signal connection to terminal equipment.

8. The early warning device as described in claim 7, characterized in that, The signal processing module further includes a current detection module, which is used to detect the current of the photovoltaic module and is electrically connected to the second control module to obtain the current information of the photovoltaic module and transmit it to the second control module.

9. The early warning device according to any one of claims 1 to 8, characterized in that, The terminal detection module is provided in multiple units, which are used to electrically connect one-to-one with multiple photovoltaic modules. The multiple terminal detection modules are connected in series or in parallel.

10. The early warning device as described in claim 9, characterized in that, Each of the terminal detection modules is also used to send an encoded message to the signal processing module, and the encoded message sent by different terminal detection modules is different.

11. A photovoltaic system, characterized in that, include: Photovoltaic modules; The early warning device as described in any one of claims 1 to 10, wherein the early warning device is electrically connected to the positive terminal and the negative terminal of the photovoltaic module, and is used to detect the temperature of the positive terminal and the negative terminal, and to issue an early warning signal based on the temperature.

12. The photovoltaic system as described in claim 11, characterized in that, The photovoltaic system also includes an inverter, which is electrically connected to the output of the early warning device to control the photovoltaic modules to stop operating based on the early warning signal.

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