Hot-spot automatic circuit breaker and photovoltaic module with hot-spot automatic circuit breaker

Abstract

The invention relates to the technical field of photovoltaic modules, in particular to a hot spot automatic circuit breaker and a photovoltaic module with the same. The hot spot automatic circuit breaker comprises a main circuit output end M, a battery string access end N, a main circuit connection circuit, a bypass circuit, a short-circuit circuit, a voltage detection module V, a current detection module A1, a current detection module A2, a state switching module, a current comparison module, a switch S1, a switch S2 and a switch S3. According to the photovoltaic module with the hot spot automatic circuit breaker, the circuit structure is optimized, the photovoltaic cell string with the hot spot fault is bypassed and disconnected from the main circuit, the temperature rise of the hot spots is prevented, the heat of the hot spots has time to be dissipated in time, and therefore the temperature on the cell pieces can be greatly reduced when the hot spots occur; whether the hot spots are eliminated or not is detected regularly, and the main circuit is accessed in time after elimination; the preset value of the voltage V can be set so that intervention can be earlier than a bypass diode scheme when a hot spot occurs.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic modules, and particularly relates to a hot spot automatic circuit breaker and a photovoltaic module with the same. BACKGROUND

[0002] The existing photovoltaic module solves the hot spot problem by connecting a bypass diode in parallel with the photovoltaic cell string. When the photovoltaic cell string is shaded, the voltage of the shaded photovoltaic cell string decreases first, and then gradually decreases to the negative value and further decreases to the starting voltage of the bypass diode as the shading area increases. At this time, the bypass diode is turned on, the photovoltaic cell string is bypassed, and part of the current flows through the bypass diode. As the shading area increases, the current flowing through the bypass diode gradually increases, and the current flowing through the shaded photovoltaic cell string gradually decreases. The power consumed by the shaded photovoltaic cell string experiences a process of gradually increasing to the starting voltage of the bypass diode and then gradually decreasing. In fact, when the voltage between the two ends of the shaded cell in the photovoltaic cell string is negative, the cell starts to heat. In some shading conditions, the bypass diode does not start, and the heating of the shaded cell does not stop after the bypass diode starts. The bypass diode mainly solves the problem of not affecting the power generation of other photovoltaic cell strings, and at the same time, the voltage of the shaded cell with hot spot failure is reduced to a certain extent, but it cannot fundamentally solve the problem of heating of the shaded cell. SUMMARY

[0003] The present application solves the technical problem that the existing photovoltaic module intervenes too late after the hot spot problem occurs, and cannot timely solve the heating problem of the shaded cell.

[0004] The technical scheme adopted by the present application to solve its technical problems is: a hot spot automatic circuit breaker, comprising a main circuit output end M, a battery string access end N, a main circuit connection circuit, a bypass circuit, a short circuit circuit, a voltage detection module V, a current detection module A1, a current detection module A2, a state switching module, a current comparison module, a switch S1, a switch S2 and a switch S3, the battery string access end N is used for being connected with a corresponding photovoltaic battery string, the main circuit output end M is used for connecting the corresponding photovoltaic battery string into a main circuit of a photovoltaic module, the battery string access end N and the main circuit output end M are connected through the main circuit connection circuit, the bypass circuit and the short circuit circuit are connected in parallel between positive and negative lines of the main circuit connection circuit, the switch S1 is connected in series in the main circuit connection circuit and is used for turning on and off the main circuit connection circuit, along the current output direction of the main circuit connection circuit, the bypass circuit is located after the switch S1, the short circuit circuit is located before the switch S1, the switch S2 is connected in series in the bypass circuit and is used for turning on and off the bypass circuit, the switch S3 is connected in series in the short circuit circuit and is used for turning on and off the short circuit circuit, the voltage detection module V is also connected in parallel between the positive and negative lines of the main circuit connection circuit and is used for detecting whether the voltage V of the corresponding photovoltaic battery string is less than a preset value, when the voltage detection module V detects that the voltage V is less than the preset value, the voltage detection module V controls the switch S2 to be closed and the switch S1 to be opened, the current comparison module is connected with the current detection module A1, the current detection module A2, the switch S1, the switch S2 and the switch S3, the current detection module A1 is used for detecting a battery string short circuit current I1 flowing through the short circuit circuit, the current detection module A2 is used for detecting a main circuit current I2 flowing through the bypass circuit, the current comparison module controls the switch S3 to be closed in a timing manner and is used for detecting the battery string short circuit current I1 in a timing manner, when the current comparison module detects that the battery string short circuit current I1 is greater than the main circuit current I2, the current comparison module controls the switch S3 to be opened, the switch S1 to be closed and the switch S2 to be opened, the state switching module is connected with the voltage detection module V and the current comparison module, when the voltage detection module V detects that the voltage V is less than the preset value, the voltage detection module V sends a state switching signal, after receiving the state switching signal, the state switching module puts the voltage detection module V in a non-working state and puts the current comparison module in a working state, when the current comparison module detects that the battery string short circuit current I1 is greater than the main circuit current I2, the current comparison module sends a state switching signal, after receiving the state switching signal, the state switching module puts the voltage detection module V in a working state and puts the current comparison module in a non-working state.

[0005] A photovoltaic module with a hot spot automatic circuit breaker, comprising a photovoltaic battery string and the above-mentioned hot spot automatic circuit breaker matched with the photovoltaic battery string, the photovoltaic battery string is connected with the matched hot spot automatic circuit breaker and is connected into a main circuit of the photovoltaic module through the matched hot spot automatic circuit breaker.

[0006] In some embodiments, each photovoltaic cell string is matched with a hot spot automatic circuit breaker, and the hot spot automatic circuit breakers are connected in series; or, each two photovoltaic cell strings are matched with a hot spot automatic circuit breaker, the two photovoltaic cell strings connected to the same hot spot automatic circuit breaker are connected in parallel, and the hot spot automatic circuit breakers are connected in series.

[0007] In some embodiments, the hot spot automatic circuit breaker further comprises a box body, the circuit part of the hot spot automatic circuit breaker is located in the box body, and the hot spot automatic circuit breaker is fixed to the back of the photovoltaic module through the box body.

[0008] In some embodiments, the hot spot automatic circuit breaker is divided into a positive hot spot automatic circuit breaker, an intermediate hot spot automatic circuit breaker and a negative hot spot automatic circuit breaker, the intermediate hot spot automatic circuit breaker is located between the positive hot spot automatic circuit breaker and the negative hot spot automatic circuit breaker, and the positive electrode of the main circuit output end M of the positive hot spot automatic circuit breaker and the negative electrode of the main circuit output end M of the negative hot spot automatic circuit breaker serve as the positive electrode and the negative electrode of the photovoltaic module, and are used for outputting the current of the photovoltaic module.

[0009] The hot spot automatic circuit breaker detects the voltage V of the photovoltaic cell string, bypasses the photovoltaic cell string with the bypass circuit when the voltage V of the photovoltaic cell string is obviously smaller than the preset value, does not affect the current of other photovoltaic cell strings, disconnects the photovoltaic cell string, thereby avoiding the temperature rise of the cell sheet hot spot, simultaneously detects the cell string short-circuit current I1 and the main circuit current I2 of the photovoltaic cell string, and when the cell string short-circuit current I1 of the photovoltaic cell string is less than the main circuit current I2 of the photovoltaic module, it is indicated that the cell sheet is still blocked, at this time, the photovoltaic cell string is kept disconnected, and after a certain time delay, the cell string short-circuit current I1 of the photovoltaic cell string is tested again, and if I1 is still less than I2, the above operation is repeated; until I1>I2 is measured, it is indicated that the blocking condition has been eliminated, at this time, the photovoltaic cell string is connected to the main circuit of the photovoltaic module; then the above process is repeated; thereby the photovoltaic cell string with hot spot failure can be bypassed and disconnected from the main circuit without affecting power generation, the hot spot temperature rise is prevented, the heat of the hot spot has time to dissipate in time, thereby the temperature of the cell sheet can be greatly reduced when the hot spot occurs; and whether the hot spot is eliminated is detected at regular time, and the main circuit is connected in time after the hot spot is eliminated; the preset value of the voltage V can be set, so that the intervention can be earlier than the bypass diode scheme when the hot spot occurs. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0011] Figure 1 is the circuit principle diagram of the hot spot automatic circuit breaker of the back surface of the photovoltaic module of the present application; Figure 2 is the front surface schematic diagram of the photovoltaic module of the present application; Figure 3 is the front surface schematic diagram of the photovoltaic module in the prior art; Figure 4 is the back surface schematic diagram of the photovoltaic module of the present application; Figure 5 is the back surface schematic diagram of the photovoltaic module in the prior art; Figure 6 is the circuit principle diagram of the photovoltaic module of the present application; Figure 7 is the circuit principle diagram of the photovoltaic module in the prior art.

[0012] In the figure, 1. photovoltaic module, 11. photovoltaic cell string, 2. hot spot automatic circuit breaker, 21. positive hot spot automatic circuit breaker, 22. intermediate hot spot automatic circuit breaker, 23. negative hot spot automatic circuit breaker, 3. box body, 4. junction box. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0014] As shown in Figure 1 , a hot spot automatic circuit breaker includes a main circuit output end M, a cell string access end N, a main circuit connection circuit, a bypass circuit, a short circuit circuit, a voltage detection module V, a current detection module A1, a current detection module A2, a state switching module, a current comparison module, a switch S1, a switch S2 and a switch S3.

[0015] The battery string access end N is used for connecting with the corresponding photovoltaic battery string 11, the main circuit output end M is used for connecting the corresponding photovoltaic battery string 11 into the main circuit of the photovoltaic module 1, the battery string access end N and the main circuit output end M are connected through the main circuit connection circuit, the bypass circuit and the short circuit circuit are connected in parallel between the positive and negative lines of the main circuit connection circuit, the switch S1 is connected in series in the main circuit connection circuit, and is used for opening and closing the main circuit connection circuit, along the current output direction of the main circuit connection circuit, the bypass circuit is located after the switch S1, the short circuit circuit is located before the switch S1, the switch S2 is connected in series in the bypass circuit, and is used for opening and closing the bypass circuit, and the switch S3 is connected in series in the short circuit circuit, and is used for opening and closing the short circuit circuit.

[0016] The voltage detection module V is also connected in parallel between the positive and negative lines of the main circuit connection circuit, and is used for detecting whether the voltage V of the corresponding photovoltaic battery string 11 is less than a preset value, and the voltage detection module V controls the switch S2 to be closed and the switch S1 to be opened when detecting that the voltage V is less than the preset value.

[0017] The current comparison module is connected with the current detection module A1, the current detection module A2, the switch S1, the switch S2 and the switch S3, the current detection module A1 is used for detecting the battery string short circuit current I1 flowing through the short circuit circuit, and the current detection module A2 is used for detecting the main circuit current I2 flowing through the bypass circuit.

[0018] The current comparison module controls the switch S3 to be closed in time, and is used for detecting the battery string short circuit current I1 in time, and the current comparison module controls the switch S3 to be opened, the switch S1 to be closed and the switch S2 to be opened when detecting that the battery string short circuit current I1 is greater than the main circuit current I2.

[0019] The state switching module is connected with the voltage detection module V and the current comparison module, the voltage detection module V sends a state switching signal when detecting that the voltage V is less than the preset value, and the state switching module sets the voltage detection module V to be in a non-working state and sets the current comparison module to be in a working state after receiving the state switching signal.

[0020] The current comparison module sends a state switching signal when detecting that the battery string short circuit current I1 is greater than the main circuit current I2, and the state switching module sets the voltage detection module V to be in a working state and sets the current comparison module to be in a non-working state after receiving the state switching signal.

[0021] As shown in Figure 1 , Figure 2 and Figure 4 , a photovoltaic module with a hot spot automatic circuit breaker includes a photovoltaic battery string 11 and a hot spot automatic circuit breaker 2 matched with the photovoltaic battery string 11, and the photovoltaic battery string 11 is connected with the matched hot spot automatic circuit breaker 2 and is connected into the main circuit of the photovoltaic module 1 through the matched hot spot automatic circuit breaker 2.

[0022] Each photovoltaic cell string 11 is matched with a hot spot automatic circuit breaker 2, and the hot spot automatic circuit breakers 2 are connected in series; or, each two photovoltaic cell strings 11 are matched with a hot spot automatic circuit breaker 2, the two photovoltaic cell strings 11 connected to the same hot spot automatic circuit breaker 2 are connected in parallel, and the hot spot automatic circuit breakers 2 are connected in series, as shown in Figure 6 .

[0023] The hot spot automatic circuit breaker 2 further comprises a box body 3, and the circuit part of the hot spot automatic circuit breaker 2 is located in the box body 3. The hot spot automatic circuit breaker 2 is fixed to the back of the photovoltaic module 1 through the box body 3.

[0024] The several hot spot automatic circuit breakers 2 on the back of the photovoltaic module 1 are divided into positive hot spot automatic circuit breakers 21, intermediate hot spot automatic circuit breakers 22 and negative hot spot automatic circuit breakers 23. The intermediate hot spot automatic circuit breakers 22 are located between the positive hot spot automatic circuit breakers 21 and the negative hot spot automatic circuit breakers 23. The positive electrode of the main circuit output end M of the positive hot spot automatic circuit breaker 21 and the negative electrode of the main circuit output end M of the negative hot spot automatic circuit breaker 23 serve as the positive electrode and the negative electrode of the photovoltaic module 1, and are used for outputting the current of the photovoltaic module 1 to the outside.

[0025] The voltage detection module V, the current detection module A1, the current detection module A2, the state switching module and the current comparison module can be realized by a hardware circuit, or part or all of the functions of each module can be realized by an existing computer program in a chip. Based on different current detection principles, the current detection module A1 and the current detection module A2 are respectively connected in series or in parallel in the short circuit circuit and the bypass circuit, or the current detection module A1 and the current detection module A2 are arranged near the short circuit circuit and the bypass circuit in a non-contact manner.

[0026] In the embodiment, the current detection module A1 and the current detection module A2 are respectively connected in series in the short circuit circuit and the bypass circuit for current detection.

[0027] The switch S1 is a normally closed switch, the switch S2 and the switch S3 are normally open switches, and the switch S1, the switch S2 and the switch S3 are all electronic switches.

[0028] In order to clearly show the connection relationship between the main circuit output end M, the cell string connection end N, the main circuit connection circuit, the bypass circuit, the short circuit circuit, the voltage detection module V, the current detection module A1, the current detection module A2, the switch S1, the switch S2 and the switch S3, the state switching module and the current comparison module are omitted in the drawings.

[0029] The working principle of the hot spot automatic circuit breaker 2 is as follows: During normal operation, switch S1 is normally closed, and switches S2 and S3 are normally open. The photovoltaic module 1 connects the photovoltaic cell strings 11 inside the photovoltaic module 1 together through three hot spot automatic circuit breakers 2 and transmits current to the outside.

[0030] The voltage detection module V periodically measures the voltage V of the photovoltaic cell string 11. Since the normal voltage of crystalline silicon cells when generating electricity is between 0.5 and 0.7V, assuming the number of cells in the photovoltaic cell string 11 is n, the voltage V that should be measured during normal operation is 0.5n to 0.7nV. If it is lower than this value, it indicates that external shading has occurred, or that the cells in the photovoltaic cell string 11 are damaged, or that the power output has significantly decreased. If the shading area is large enough, such as... Figure 7 As shown, in the existing photovoltaic module 1, the bypass diode connected in parallel will activate, which is equivalent to shielding this photovoltaic cell string 11 and will not affect the power generation of other photovoltaic cell strings 11. However, the photovoltaic cell string 11 with hot spots will still have reverse bias voltage and current at both ends, and the cells in the photovoltaic cell string 11 will continue to heat up, which will affect the lifespan of the photovoltaic module 1, and in severe cases, may even cause a fire.

[0031] Assume that the preset value of the voltage detection module V is set at 0.4nV, when the voltage V measured by the voltage detection module V is greater than 0.4nV, it does not act, and delays for a certain time, such as 2S, and measures the voltage V again, until the measured voltage V is less than 0.4nV, a trigger signal is sent to the switch S2, and the switch S2 is closed, at this time the current in the main circuit of the photovoltaic module 1 can pass through the bypass circuit connected in series with the switch S2, without affecting the power generation of other photovoltaic cell strings 11 in the photovoltaic module 1; after the switch S2 is closed, the switch S1 is opened after a certain time delay, such as 1S, at this time the photovoltaic cell string 11 with hot spot is disconnected, and the cell will start to cool down; when the switch S1 remains in the open state, the switch S3 is closed every certain time, such as 30S, at this time both the current detection device A1 and the current detection device A2 are connected, and the short-circuit current I1 and the main circuit current I2 of the photovoltaic cell string 11 can be measured respectively, the current comparison module detects the short-circuit current I1 and the main circuit current I2 through the current detection device A1 and the current detection device A2, when I1≤I2, it indicates that there is still shading on this string of photovoltaic cell string 11, the switch S3 is opened, and the switch S3 is closed again after 30S, and the short-circuit current I1 and the main circuit current I2 are detected again, if I1≤I2, the above process is repeated; until the current comparison module detects that I1>I2, at this time the shading condition of the cell in this string of photovoltaic cell string 11 is eliminated, and it can be connected to the main circuit of the photovoltaic module 1 for power generation, at this time the switch S3 is opened, the switch S1 is closed after a time delay of 1S, and then the switch S2 is opened, at this time the photovoltaic cell string 11 is connected to the main circuit of the photovoltaic module 1 for power generation; at this time the voltage detection module V detects the voltage V across the photovoltaic cell string 11 again, and the above actions are repeated.

[0032] In this way, even if hot spot occurs, the photovoltaic cell string 11 with hot spot will be quickly disconnected, so the time of hot spot occurrence is discontinuous, and there is a heat dissipation time, and the temperature of the cell in the photovoltaic cell string 11 with hot spot can be greatly reduced.

[0033] The switch S1 and the switch S2 can be closed at the same time, or one is closed and the other is opened, but they cannot be opened at the same time, because if they are opened at the same time, the entire circuit will be disconnected, and when the switches are closed again, arc will occur due to high voltage, damaging the switches.

[0034] The hot spot automatic circuit breaker 2 can not only be applied in the photovoltaic module 1 of the crystalline silicon type, but also can be used in the photovoltaic module 1 of the thin film and other types, as long as the preset value of the voltage detection module V is adjusted according to the type of the cell in the photovoltaic module 1.

[0035] The voltage of the additional crystalline silicon type cell can also be set lower or higher, the higher the value, the more sensitive the start, the lower the risk of hot spot, but too high a value can exceed the MPPT range of the inverter, leading to false action, so it needs to be matched and set according to the performance of the photovoltaic module 1 and the connected inverter.

[0036] As shown in Figure 3 and 7 , the connection structure between the photovoltaic cell strings 11 in the prior art photovoltaic module 1 is a series-parallel-series structure, one bypass diode is connected in parallel between two photovoltaic cell strings 11 to form a cell string group, and three cell string groups are connected in series with each other; while as shown in Figure 2 and Figure 6 , the connection structure between the photovoltaic cell strings 11 in the photovoltaic module 1 with the hot spot automatic circuit breaker 2 is a series-parallel structure, the three hot spot automatic circuit breakers 2 are divided into a positive hot spot automatic circuit breaker 21, a middle hot spot automatic circuit breaker 22 and a negative hot spot automatic circuit breaker 23, one hot spot automatic circuit breaker 2 is matched with every two photovoltaic cell strings 11 to form a cell string group, two photovoltaic cell strings 11 connected to the same hot spot automatic circuit breaker 2 are connected in parallel, the hot spot automatic circuit breakers 2 are connected in series, and each cell string group does not affect each other, so that the cell string group can be disconnected from the main circuit of the photovoltaic module 1 when a hot spot occurs.

[0037] As shown in Figure 5 , the back of the prior art photovoltaic module 1 has three junction boxes 4, and each junction box 4 is provided with a bypass diode, and the three junction boxes are independent of each other; while as shown in Figure 4 , the back of the photovoltaic module 1 with the hot spot automatic circuit breaker 2 has three hot spot automatic circuit breakers 2, and the three hot spot automatic circuit breakers 2 are connected together.

Claims

1. A thermal spot automatic circuit breaker characterized by: The main circuit output end M, the battery string access end N, the main circuit connection circuit, the bypass circuit, the short circuit circuit, the voltage detection module V, the current detection module A1, the current detection module A2, the state switching module, the current comparison module, the switch S1, the switch S2 and the switch S3 are included. The battery string access end N is used for being connected with the corresponding photovoltaic cell string (11), the main circuit output end M is used for connecting the corresponding photovoltaic cell string (11) into the main circuit of the photovoltaic module (1), the battery string access end N and the main circuit output end M are connected through the main circuit connection circuit, the bypass circuit and the short circuit circuit are connected in parallel between the positive and negative lines of the main circuit connection circuit, the switch S1 is connected in series in the main circuit connection circuit and is used for opening and closing the main circuit connection circuit, along the current output direction of the main circuit connection circuit, the bypass circuit is located after the switch S1, the short circuit circuit is located before the switch S1, the switch S2 is connected in series in the bypass circuit and is used for opening and closing the bypass circuit, and the switch S3 is connected in series in the short circuit circuit and is used for opening and closing the short circuit circuit. The voltage detection module V is also connected in parallel between the positive and negative lines of the main circuit connection circuit and is used for detecting whether the voltage V of the corresponding photovoltaic cell string (11) is less than a preset value, and the voltage detection module V controls the switch S2 to be closed and the switch S1 to be opened when detecting that the voltage V is less than the preset value. The current comparison module is connected with the current detection module A1, the current detection module A2, the switch S1, the switch S2 and the switch S3, the current detection module A1 is used for detecting the battery string short circuit current I1 flowing through the short circuit circuit, and the current detection module A2 is used for detecting the main circuit current I2 flowing through the bypass circuit. The current comparison module controls the switch S3 to be closed in time and is used for detecting the battery string short circuit current I1 in time, and the current comparison module controls the switch S3 to be opened, the switch S1 to be closed and the switch S2 to be opened when detecting that the battery string short circuit current I1 is greater than the main circuit current I2. The state switching module is connected with the voltage detection module V and the current comparison module, the voltage detection module V sends a state switching signal when detecting that the voltage V is less than the preset value, and the state switching module sets the voltage detection module V to be in a non-working state and sets the current comparison module to be in a working state after receiving the state switching signal. The current comparison module sends a state switching signal when detecting that the battery string short circuit current I1 is greater than the main circuit current I2, and the state switching module sets the voltage detection module V to be in a working state and sets the current comparison module to be in a non-working state after receiving the state switching signal.

2. A photovoltaic module having a hot spot automatic circuit breaker, characterized by: The photovoltaic cell string (11) and the hot spot automatic circuit breaker (2) matched with the photovoltaic cell string (11) are included, the photovoltaic cell string (11) is connected with the matched hot spot automatic circuit breaker (2) and is connected into the main circuit of the photovoltaic module (1) through the matched hot spot automatic circuit breaker (2).

3. The photovoltaic module with hot spot automatic circuit breaker of claim 2, wherein: Each photovoltaic cell string (11) is matched with one hot spot automatic circuit breaker (2), and the hot spot automatic circuit breakers (2) are connected in series. Or, every two photovoltaic cell strings (11) are matched with a hot spot automatic circuit breaker (2), two photovoltaic cell strings (11) connected in parallel on the same hot spot automatic circuit breaker (2), and the hot spot automatic circuit breakers (2) are connected in series.

4. The photovoltaic module with hot spot automatic circuit breaker of claim 3, wherein: The hot spot automatic circuit breaker (2) further comprises a box body (3), and a circuit part of the hot spot automatic circuit breaker (2) is located in the box body (3), and the hot spot automatic circuit breaker (2) is fixed on the back of the photovoltaic module (1) through the box body (3).

5. The photovoltaic module with hot spot automatic circuit breaker of claim 3, wherein: The hot spot automatic circuit breaker (2) is divided into a positive hot spot automatic circuit breaker (21), an intermediate hot spot automatic circuit breaker (22) and a negative hot spot automatic circuit breaker (23), the intermediate hot spot automatic circuit breaker (22) is located between the positive hot spot automatic circuit breaker (21) and the negative hot spot automatic circuit breaker (23), and the positive electrode of the main circuit output end M of the positive hot spot automatic circuit breaker (21) and the negative electrode of the main circuit output end M of the negative hot spot automatic circuit breaker (23) serve as the positive electrode and the negative electrode of the photovoltaic module (1) and are used for externally conveying the current of the photovoltaic module (1).

Images