Photovoltaic module level turn-off device based on temperature sensing protection mechanism

Abstract

The invention discloses a photovoltaic module level turn-off device based on a temperature sensing protection mechanism, the photovoltaic module level turn-off device is used in a photovoltaic system to control a photovoltaic module string connected with the photovoltaic module level turn-off device, the photovoltaic module string comprises at least two photovoltaic modules connected in series, and the photovoltaic module level turn-off device comprises a temperature fuse, a processor, a turn-off device and a quick switch unit, a temperature fuse and a turn-off device are connected in series on a loop of each photovoltaic module, the temperature fuse is attached to the surface of the turn-off device, and when the temperature fuse is fused by the working temperature of the turn-off device, the loop of the photovoltaic module is disconnected; the turn-off device on the loop of each photovoltaic module is provided with a quick switch unit, each quick switch unit is electrically connected with the processor, and when the processor turns off the turn-off device on the loop of the photovoltaic module through the quick switch unit, the loop of the photovoltaic module is disconnected.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic technology, and particularly relates to a photovoltaic module-level disconnector based on a temperature sensing protection mechanism. Background Art

[0002] Due to the renewable and clean nature of solar energy, photovoltaic grid-connected power generation technology has developed rapidly. Currently, a photovoltaic system is formed by connecting multiple photovoltaic modules in series to form a photovoltaic string, and then converting it into alternating current through an inverter and transmitting it to the grid. The DC voltage formed by the series-connected photovoltaic module array is very high and there are great safety hazards. In order to improve the safety of the photovoltaic system, it is required that when sudden situations such as arcing and open flames occur in the photovoltaic module array, the voltage of all components in the array can be quickly turned off, thereby rapidly reducing the DC high voltage of the entire power station and minimizing the impact.

[0003] In the prior art, a disconnector is connected behind each photovoltaic module, and the power output of each photovoltaic module is controlled by the disconnector. Under normal circumstances, the component-level disconnection requirements can be met. However, when the disconnector itself is damaged, at high temperature, or even on fire, it cannot have a refined sensing and judgment function for itself, so there are still great safety risks.

[0004] When the component disconnector is damaged inside, the device damage cannot be sensed inside, and the MOS transistor presents a short circuit state between the S pole and the D pole, resulting in an unsafe state of a single disconnector, the damaged disconnector cannot be turned off, and the voltage of the entire string still cannot be reduced to a safe voltage. Summary of the Invention

[0005] The purpose of the present invention is to provide a photovoltaic module-level disconnector based on a temperature sensing protection mechanism, which monitors the internal temperature of the disconnector, and when the internal temperature is abnormal, timely turns off the MOS (M1, M2) to make the disconnector in an absolutely safe and controllable state.

[0006] The technical solution adopted by the present invention to solve its technical problems is to propose a photovoltaic module-level disconnector based on a temperature sensing protection mechanism, which is used in a photovoltaic system to control a photovoltaic module string connected thereto. The photovoltaic module string includes at least two photovoltaic modules connected in series. The photovoltaic module-level disconnector includes a thermal fuse, a processor, a disconnector, and a fast switch unit. The thermal fuse and the disconnector are connected in series on the loop of each photovoltaic module, and the thermal fuse is attached to the surface of the disconnector. When the operating temperature of the disconnector melts the thermal fuse, the loop of the photovoltaic module is disconnected; Each disconnect switch on the circuit of each of the photovoltaic modules is configured with one of the fast switch units, and each of the fast switch units is electrically connected to the processor. When the processor turns off the disconnect switch on the circuit of the photovoltaic module through the fast switch unit, the circuit of the photovoltaic module is disconnected.

[0007] Further, it further includes bypass diodes. Each of the photovoltaic modules of the photovoltaic module string is configured with a bypass diode, and the bypass diode is used to supply continuous current to the subsequent stage output.

[0008] Further, one end of the bypass diode is connected to the positive electrode of the photovoltaic module, the other end of the bypass diode is connected to the negative electrode of the photovoltaic module, and the negative electrode of the photovoltaic module is connected to the positive electrode of the subsequent photovoltaic module. When the circuit of the photovoltaic module is disconnected, the subsequent photovoltaic module is supplied with continuous current through the bypass diode.

[0009] Further, it further includes a temperature sampling unit. Each of the photovoltaic modules is configured with the temperature sampling unit, and the temperature sampling unit is electrically connected to the processor. The temperature sampling unit is disposed close to the temperature fuse or the disconnect switch, or on the attachment surface of the temperature fuse.

[0010] Further, the processor is configured to turn off the disconnect switch on the circuit of the photovoltaic module through the fast switch unit according to the detection data of the temperature sampling unit.

[0011] Further, the temperature sampling unit includes a first detection area and a second detection area. The temperature fuse is placed in the first detection area, and a first detection head is arranged in the first detection area. The first detection head is used to detect the operating temperature of the temperature fuse; the disconnect switch is placed in the second detection area, and a second detection head is arranged in the second detection area. The second detection head is used to detect the operating temperature of the disconnect switch.

[0012] Further, the photovoltaic module string includes a first module and a second module, and the first module and the second module are connected in series. The first module is configured with a first detection unit, a first fuse, a first disconnect switch, and a first fast switch. The second module is configured with a second detection unit, a second fuse, a second disconnect switch, and a second fast switch. The first detection unit and the second detection unit are electrically connected to the processor, the first fast switch and the second fast switch are electrically connected to the processor, the first fast switch is electrically connected to the first disconnect switch, and the second fast switch is electrically connected to the second disconnect switch.

[0013] Further, the first fuse and the first disconnecting switch are connected in series on the loop of the first component. The first fuse is attached to the surface of the first disconnecting switch. The first detection unit is arranged close to the first fuse or the first disconnecting switch, or is arranged on the attaching surface of the first fuse. The second fuse and the second disconnecting switch are connected in series on the loop of the second component. The second fuse is attached to the surface of the second disconnecting switch. The second detection unit is arranged close to the second fuse or the second disconnecting switch, or is arranged on the attaching surface of the second fuse.

[0014] Further, the disconnecting switch is a switching MOS. The S pole and the D pole of the switching MOS are connected in series to access the loop of the photovoltaic module. The G pole of the switching MOS is electrically connected to the fast switching unit.

[0015] Further, a coupling inductor is connected in series on the negative electrode of the last-stage photovoltaic module in the photovoltaic module string.

[0016] The beneficial effects of the present invention are as follows: A photovoltaic module-level disconnecting switch based on a temperature sensing protection mechanism proposed by the present invention has a temperature sensing and shutting-off mechanism at the hardware level, which can further achieve self-shutting-off at the hardware level when both the disconnecting switch and the controller fail, eliminating dangerous situations.

[0017] It has a temperature detection function, can detect the temperature of the device from the software level, monitor the operation state of the device in real time, make a judgment based on the threshold to shut off the device, reduce potential safety hazards, and upload and repair in time.

[0018] The disconnecting switch of the present invention supports a hardware self-shutting-off protection mechanism, adds a hardware protection mechanism on the basis of software protection, and improves the product safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings incorporated into the specification and constituting a part of the specification illustrate embodiments of the present invention and, together with the description, are used to explain the principles of the present invention. In these drawings, like reference numerals are used to represent like elements. The following drawings are some embodiments of the present invention, not all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a structural diagram of a photovoltaic module-level disconnecting switch based on a temperature sensing protection mechanism according to an embodiment of the present invention; Figure 2 It is a structural diagram of the temperature sampling unit NTC; Figure 3 It is a structural diagram of the fast switching unit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention and the prior art, the following will describe the specific embodiments of the present invention with reference to the accompanying drawings. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other embodiments can be obtained. In addition, the terms related to the design orientation only represent the relative positional relationship between components, rather than the absolute positional relationship.

[0022] The embodiments of the present invention provide a photovoltaic module-level disconnector based on a temperature sensing protection mechanism, which is used in a photovoltaic system to control a photovoltaic module string connected thereto. The photovoltaic module string includes at least two photovoltaic modules connected in series. Please refer to Figure 1 , Figure 2 , Figure 3 . The photovoltaic module-level disconnector includes a thermal fuse, a processor U, a disconnector, and a fast switch unit. A thermal fuse and a disconnector are connected in series on the circuit of each photovoltaic module, and the thermal fuse is attached to the surface of the disconnector. When the operating temperature of the disconnector melts the thermal fuse, the circuit of the photovoltaic module is disconnected; A fast switch unit is configured for each disconnector on the circuit of each photovoltaic module. Each fast switch unit is electrically connected to the processor U. When the processor U turns off the disconnector on the circuit of the photovoltaic module through the fast switch unit, the circuit of the photovoltaic module is disconnected.

[0023] In the embodiments of the present application, when the circuit of the photovoltaic module is disconnected, only the circuit of the current photovoltaic module is disconnected, and the circuits of the subsequent photovoltaic modules remain in a conducting state. A bypass conduction can be configured for the circuit of each photovoltaic module, so that when the circuit of a certain photovoltaic module is disconnected, the circuits of the subsequent photovoltaic modules can still remain in a conducting state.

[0024] Specifically, a bypass diode can be set. Each photovoltaic module of the photovoltaic module string is configured with a bypass diode, and the bypass diode is used to supply continuous current to the subsequent stage.

[0025] Exemplarily, one end of the bypass diode is connected to the positive electrode of the photovoltaic module, and the other end of the bypass diode is connected to the negative electrode of the photovoltaic module, so that the bypass diode forms a branch in a parallel state with the circuit of the photovoltaic module and is in a parallel relationship with other electronic components on the circuit of the photovoltaic module. When the circuit of the photovoltaic module is disconnected, the branch is still conducting and can supply continuous current to the subsequent photovoltaic modules.

[0026] Based on the series relationship between photovoltaic modules, the negative electrode of a photovoltaic module is connected to the positive electrode of the subsequent photovoltaic module. When the circuit of the current-stage photovoltaic module is disconnected, continuous current is supplied to the subsequent photovoltaic modules through the bypass diode.

[0027] In this application, the photovoltaic module-level shutdown device includes the following two shutdown behaviors: The first is based on the shutdown of the hardware itself, which is a passive form. Specifically, a thermal fuse is connected in series with a circuit breaker, and the thermal fuse is attached to the circuit breaker. When the circuit breaker is damaged and short-circuited, the temperature of the circuit breaker rises rapidly, and the thermal fuse blows to disconnect the circuit.

[0028] The second is software-based shutdown, which is an active form. Specifically, the shutdown threshold of a specific parameter can be set and the parameter can be detected. When the parameter reaches the shutdown threshold, the circuit breaker is disconnected through the fast switching unit, thereby disconnecting the circuit.

[0029] In a specific embodiment, the specific parameter may be preferably temperature, and the detection object may be a temperature fuse or a circuit breaker. A temperature sampling unit may be configured for each photovoltaic module, and the temperature sampling unit is electrically connected to the processor. The temperature sampling unit may be arranged close to the temperature fuse or the circuit breaker, or may be arranged on the surface of the temperature fuse, so as to detect the operating temperature of the temperature fuse or the circuit breaker nearby, so as to facilitate active real-time shutdown behavior.

[0030] Based on active shutdown, the processor can shut down the circuit breaker on the circuit of the photovoltaic component through the fast switch unit according to the detection data of the temperature sampling unit, so as to disconnect the circuit of the current photovoltaic component.

[0031] Furthermore, the temperature sampling unit can synchronously perform temperature detection on the temperature fuse and the circuit breaker, wherein the temperature detection data of the temperature fuse is used as loop status monitoring, and the temperature detection data of the circuit breaker is used as the basis for active shutdown, or the two sets of temperature detection data are combined as the basis for active shutdown.

[0032] In a feasible embodiment, the temperature sampling unit includes a first detection area and a second detection area. The temperature fuse is placed in the first detection area. A first detection head is set in the first detection area. The first detection head is used to detect the working temperature of the temperature fuse; the circuit breaker is placed in the second detection area. A second detection head is set in the second detection area. The second detection head is used to detect the working temperature of the circuit breaker.

[0033] The operating temperature of the temperature fuse is used as the loop status monitoring of the photovoltaic module at this level to determine whether the loop is disconnected; the operating temperature of the circuit breaker is used as the basis for implementing active shutdown. When the operating temperature of the circuit breaker reaches the set shutdown threshold, active shutdown can be implemented.

[0034] In an embodiment of the present application, the circuit breaker may be a switch MOS, the S pole and the D pole of the switch MOS are connected in series to the loop of the photovoltaic component, and the G pole of the switch MOS is electrically connected to the fast switch unit.

[0035] A temperature detection unit is provided at each switching MOS, which can determine whether there is damage by detecting the temperature of the switching MOS, and can promptly perform a turn-off operation through the processor.

[0036] In this application, the photovoltaic module string includes a plurality of photovoltaic modules connected in series. A coupling inductor L can be connected in series to the negative electrode of the last-stage photovoltaic module in the photovoltaic module string. When the current demand of the subsequent-stage photovoltaic module increases instantaneously, the current mutation will cause unstable power supply. However, the characteristics of the coupling inductor L itself determine that the current flowing through the inductor cannot mutate, which can well protect the stability of the power supply of the entire system.

[0037] Please refer to Figure 1 , taking the photovoltaic module string including two photovoltaic modules connected in series as an example for illustration and explanation.

[0038] The photovoltaic module string includes a first module PV1 and a second module PV2. The first module PV1 and the second module PV2 are connected in series, and the series connection form is that the negative electrode of the first module PV1 is connected in series with the positive electrode of the second module PV2.

[0039] The first module PV1 is configured with a first detection unit N1, a first fuse F1, a first disconnect switch M1, and a first fast switch S1. The second module PV2 is configured with a second detection unit N2, a second fuse F2, a second disconnect switch M2, and a second fast switch S2. The first detection unit N1 and the second detection unit N2 are electrically connected to the processor U. The first fast switch S1 and the second fast switch S2 are electrically connected to the processor U. The first fast switch S1 is electrically connected to the first disconnect switch M1, and the second fast switch S2 is electrically connected to the second disconnect switch M2.

[0040] The first fuse F1 and the first disconnect switch M1 are connected in series to the loop of the first module PV1. Specifically, the first fuse F1 can be connected in series to the S pole or D pole of the first disconnect switch M1. The first fuse F1 is attached to the surface of the first disconnect switch M1. The first detection unit N1 is disposed close to the first fuse F1 or the first disconnect switch M1, or is disposed on the attached surface of the first fuse F1. The attached surface is the surface of the first disconnect switch M1, which can be the surface attached by the first fuse F1 or other surfaces suitable for attaching the first fuse F1.

[0041] The second fuse F2 and the second disconnect switch M1 are connected in series to the loop of the second module PV2. The series connection position of the second fuse F2 is the same as that of the first fuse F1. The second fuse F2 is attached to the surface of the second disconnect switch M2. The second detection unit N2 is disposed close to the second fuse F2 or the second disconnect switch M2, or is disposed on the attached surface of the second fuse F2.

[0042] Correspondingly, the first module PV1 is configured with a first bypass diode D1, and the second module PV2 is configured with a second bypass diode D2. AsFigure 1 As shown, one end of the first bypass diode D1 is electrically connected to the positive electrode OUT+ of the voltage output in series with the PV module and the positive electrode PV1+ of the first module PV1, and the other end of the first bypass diode D1 is electrically connected to the positive electrode PV2+ of the second module PV2; one end of the second bypass diode D2 is electrically connected to the positive electrode PV2+ of the second module PV2, and the other end of the second bypass diode D2 is electrically connected to the negative electrode OUT- of the voltage output in series with the PV module.

[0043] The coupling inductor L can be located at the negative electrode of the second module PV2, and specifically can be arranged between the access point at the other end of the second bypass diode D2 and the negative electrode OUT- of the voltage output in series with the PV module.

[0044] The function of the temperature sampling unit NTC is to monitor the internal temperature of the disconnector in real time. When the switching MOS works normally, the internal heat is not high. Once the switching MOS is abnormal and may be damaged, the loss of the switching MOS will increase. The manifestation of the increased loss is that the temperature of the switching MOS will rise rapidly. At this time, the processor U can read the specific temperature value for control judgment to protect the disconnector in time without being affected. And the detected temperature information is uploaded to the controller / host computer. The controller / host computer can issue a disconnection instruction to stop the output of the entire string of related disconnectors and upload it to the platform. When the operation and maintenance personnel obtain this information, they will make timely repairs.

[0045] In a feasible embodiment, please refer to Figure 2 , when the temperature sampling unit NTC is applied to different photovoltaic modules, it is divided into the first detection unit N1 and the second detection unit N2. The temperature sampling implementation circuits of the first detection unit N1 and the second detection unit N2 can be exactly the same. The temperature sampling unit can be implemented by the temperature sampling resistor NTC1, the pull-down resistor R1, and the filter capacitor C1. Among them, the resistance value of the pull-down resistor R1 is 10 KΩ, the rated capacitance of the filter capacitor C1 is 100nF, and the resistor NTC1 is a temperature resistor. At room temperature of 25 degrees Celsius, it corresponds to 10KΩ. The higher the temperature, the smaller the resistance value, and it is more accurate for high-temperature acquisition.

[0046] The fast-switching unit is used to control the on and off of the switching MOS. When the product is operating normally, the fast-switching unit is turned on. At this time, the power supply forms a conduction path from the positive electrode to the negative electrode, and a power output path is formed from VOUT+ to VOUT-. When it is necessary to cut off the power output, the fast-switching unit is turned off. At this time, the power supply path from the positive electrode to the negative electrode is disconnected, resulting in the disconnection of the output path from VOUT+ to VOUT-, and it cannot be output to the subsequent stage.

[0047] In a feasible embodiment, please refer to Figure 3, the number of fast switch units is consistent with the number of disconnectors. When the fast switch units are applied to different photovoltaic modules, they are divided into fast switch units 1 and fast switch units 2, which can be specifically the first fast switch S1 and the second fast switch S2. The implementation circuits of the first fast switch S1 and the second fast switch S2 can be completely consistent. The fast switch unit can be implemented based on the first resistor R1, the second resistor R2, the third resistor R3 and the MOS tube Q1, wherein the resistance value of the first resistor R1 can be 10KΩ, the second resistor is 100KΩ, and the third resistor is 10KΩ. The first resistor R1 is connected to the GPIO port of the logic control (processor). When the GPIO is high, the MOS tube Q1 is turned on. At this time, the switch MOS is given a low-level signal, and the switch MOS is turned off; when the GPIO is low, the MOS tube Q1 is turned off. At this time, the level given to the switch MOS is the VCC level, that is, the high level, and the switch MOS is turned on. Since the switching speed of the MOS is very fast, the fast switching function can be realized through this circuit.

[0048] In the present application, the first component PV1 and the second component PV2 can input voltage at the same time, and the negative pole of the first component PV1 and the positive pole of the second component PV2 are connected together through the circuit to form a series circuit. The voltage at the output end is the sum of the voltage of the first component PV1 + the voltage of the second component PV2. At the same time, the first component PV1 and the second component PV2 can control the opening and closing of the switch MOS through their respective fast switching units to avoid unstable post-stage output caused by abnormal component input ends.

[0049] In the embodiment of the present application, the switch MOS can be placed on the negative power line to directly control the on and off of the power input and output. At the same time, the probability of failure of the switch MOS is reduced and the service life of the product is increased.

[0050] Two fast switches are connected by a logic control / processor U, and each fast switch unit controls the switch MOS of the corresponding photovoltaic component, so that the two photovoltaic components are independently controlled and can be shut down individually when one component is abnormal.

[0051] In the embodiment of the present application, the temperature fuse FUSE can be a temperature-type fuse. The two pins inside the fuse are connected by a special alloy. This alloy is particularly sensitive to temperature. When the temperature is higher than the alloy's tolerance threshold, the alloy automatically disconnects. The fuse (F1, F2) is attached to the surface of the MOS (M1, M2). When the switch MOS works normally, the surface temperature will be much lower than the tolerance threshold and will not cause the fuse to malfunction (fuse). However, after the switch MOS is damaged, the surface temperature will rise rapidly, and the temperature will be transmitted to the fuse attached to the switch MOS, thereby triggering the fuse to automatically disconnect (fuse).

[0052] In the embodiments of the present application, bypass diodes (D1, D2) are used to conduct when a fault occurs in the input of a photovoltaic module, to construct a bypass for a single photovoltaic module, and to supply continuous current to the subsequent stage output through D1 and D2, so that the entire system is not affected by the failure of a single disconnector for overall power supply; in this circuit, when the first module PV1 is abnormal, the switching MOS (M1) is turned off. At this time, the power supply of the second module PV2 flows to the output OUT+ through the first bypass diode D1, and the output voltage of the entire module is equal to the input voltage of module 2. Similarly, when the second module PV2 is abnormal, the switching MOS (M2) is turned off. At this time, the power supply of the first module PV1 flows to the output OUT- through the second bypass diode D2, and the output voltage of the entire module is equal to the input voltage of module 1.

[0053] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0054] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific embodiments of the present invention are only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A photovoltaic module-level switch based on a temperature sensing protection mechanism, used in a photovoltaic system to control a photovoltaic module string connected thereto, wherein the photovoltaic module string comprises at least two photovoltaic modules connected in series, characterized in that: The photovoltaic module-level switch includes a temperature fuse, a processor, a switch and a fast switch unit. The temperature fuse and the switch are connected in series on the circuit of each photovoltaic module, and the temperature fuse is attached to the surface of the switch. When the operating temperature of the switch melts the temperature fuse, the circuit of the photovoltaic module is disconnected; The circuit breaker on the circuit of each photovoltaic component is configured with a fast switch unit, and each fast switch unit is electrically connected to the processor. When the processor turns off the circuit breaker on the circuit of the photovoltaic component through the fast switch unit, the circuit of the photovoltaic component is disconnected.

2. A photovoltaic module-level shutdown device based on a temperature sensing protection mechanism according to claim 1, characterized in that: It also includes a bypass diode. Each photovoltaic component in the photovoltaic component string is equipped with the bypass diode, and the bypass diode is used to provide power for the subsequent output.

3. A photovoltaic module-level shutdown device based on a temperature sensing protection mechanism according to claim 2, characterized in that: One end of the bypass diode is connected to the positive electrode of the photovoltaic component, and the other end of the bypass diode is connected to the negative electrode of the photovoltaic component. The negative electrode of the photovoltaic component is connected to the positive electrode of the subsequent photovoltaic component, so that when the circuit of the photovoltaic component is disconnected, the bypass diode is used to supply power to the subsequent photovoltaic component.

4. A photovoltaic module-level shutdown device based on a temperature sensing protection mechanism according to claim 1, characterized in that: It also includes a temperature sampling unit. Each photovoltaic assembly is equipped with the temperature sampling unit. The temperature sampling unit is electrically connected to the processor. The temperature sampling unit is arranged close to the temperature fuse or the switch, or is arranged on the attachment surface of the temperature fuse.

5. A photovoltaic module-level shut-off device based on a temperature sensing protection mechanism according to claim 4, characterized in that: The processor is used for shutting off the circuit breaker on the photovoltaic assembly circuit through the fast switch unit according to the detection data of the temperature sampling unit.

6. A photovoltaic module-level shut-off device based on a temperature sensing protection mechanism according to claim 4, characterized in that: The temperature sampling unit includes a first detection area and a second detection area. The temperature fuse is placed in the first detection area. A first detection head is set in the first detection area. The first detection head is used to detect the working temperature of the temperature fuse; the circuit breaker is placed in the second detection area. A second detection head is set in the second detection area. The second detection head is used to detect the working temperature of the circuit breaker.

7. A photovoltaic module-level shut-off device based on a temperature sensing protection mechanism according to claim 4, characterized in that: The photovoltaic component string includes a first component and a second component, the first component and the second component are connected in series, the first component is configured with a first detection unit, a first fuse, a first circuit breaker, and a first fast switch, the second component is configured with a second detection unit, a second fuse, a second circuit breaker, and a second fast switch, the first detection unit and the second detection unit are electrically connected to the processor, the first fast switch and the second fast switch are electrically connected to the processor, the first fast switch is electrically connected to the first circuit breaker, and the second fast switch is electrically connected to the second circuit breaker.

8. A photovoltaic module-level shut-off device based on a temperature sensing protection mechanism according to claim 7, characterized in that: The first fuse and the first switch are connected in series to the loop of the first component, the first fuse is attached to the surface of the first switch, and the first detection unit is arranged close to the first fuse or the first switch, or is arranged on the attached surface of the first fuse; the second fuse and the second switch are connected in series to the loop of the second component, the second fuse is attached to the surface of the second switch, and the second detection unit is arranged close to the second fuse or the second switch, or is arranged on the attached surface of the second fuse.

9. A photovoltaic module-level shut-off device based on a temperature sensing protection mechanism according to claim 1, characterized in that: The switch is a switch MOS, the S pole and the D pole of the switch MOS are connected in series to the loop of the photovoltaic component, and the G pole of the switch MOS is electrically connected to the fast switch unit.

10. A photovoltaic module-level shutdown device based on a temperature sensing protection mechanism according to claim 1, characterized in that: A coupling inductor is connected in series to the negative electrode of the last-stage photovoltaic component in the photovoltaic component string.

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