Overload protection device for photovoltaic energy storage circuit

Abstract

The utility model discloses an overload protection device for a photovoltaic energy storage circuit, and relates to the technical field of overload protection in a power electronic technology and a photovoltaic power generation system, the overload protection device comprises a mounting shell, a main control unit, a current sensor, a driving circuit and a combination switch module, and a shell door is hinged to one side of the mounting shell. The current sensor continuously collects current data in a circuit and transmits the current data to the main control unit, and the main control unit analyzes the received current data, calculates a current actual current value, compares the current actual current value with a preset safety threshold value, and controls each silicon controlled rectifier in the composite switch module to be switched on or switched off. And in the recovery stage, the main control unit continuously monitors the current condition, closes the circuit again after confirming that no abnormity exists, and recovers normal work, so that the response speed of the overload protection device is improved, the circuit can be rapidly cut off when overload occurs, and equipment damage and potential safety hazards are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics and overload protection in photovoltaic power generation systems, in particular to a photovoltaic energy storage circuit overload protection device. BACKGROUND

[0002] With the increasing demand for renewable energy worldwide, solar energy has received widespread attention as a clean and sustainable energy source. However, in practical applications, the safety of photovoltaic energy storage systems has gradually become a problem. Among them, overload protection is an important safety measure that can effectively prevent equipment damage and fire accidents caused by excessive current.

[0003] Although the existing overload protection device can meet the demand to some extent, there are still some deficiencies; for example, the action of the traditional fuse is irreversible, the maintenance cost is high, the electromagnetic relay is easily affected by environmental factors, the reliability is not high, the cost of solid-state switch is relatively high, and the performance is unstable under extreme conditions, therefore, it is urgent to develop a new type of overload protection device to improve the reliability and economy of the system. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to solve or at least alleviate the problem of the electromagnetic relay being easily affected by environmental factors in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a photovoltaic energy storage circuit overload protection device, comprising a mounting shell, a main control unit, a current sensor, a driving circuit and a composite switch module, one side of the mounting shell is hinged with a shell door, the mounting shell is provided with a positioning mechanism for positioning and installing the main control unit and the current sensor;

[0006] The positioning mechanism comprises a first adjusting rod fixedly installed on the inner wall of the top of the mounting shell, the telescopic end of the first adjusting rod is fixedly installed with a first positioning plate, the bottom of the first positioning plate is fixedly installed with a second adjusting rod, the telescopic end of the second adjusting rod is fixedly installed with a second positioning plate, one side of the first adjusting rod and the second adjusting rod is respectively screwed with a first adjusting bolt and a second adjusting bolt, the first adjusting rod and the second adjusting rod are composed of a sleeve and a sleeve rod, and are embedded.

[0007] The above-mentioned technical scheme is adopted, the first positioning plate and the second positioning plate are pulled down to move, and contact with the corresponding main control unit and current sensor, at this time, the corresponding first adjusting bolt and second adjusting bolt can be rotated, so that the positioning and installation of the corresponding first adjusting rod and second adjusting rod can be completed.

[0008] Optionally, the top of the composite switch module is symmetrically fixedly provided with mounting ears, and a fixing bolt is screwed on each of the two mounting ears.

[0009] By rotating the fixing bolt, the positioning and installation of the composite switch module can be completed.

[0010] Optionally, a box body is fixedly arranged on the inner wall of one side of the mounting shell, and a temperature sensor is arranged in the box body.

[0011] By arranging the box body, the auxiliary installation effect can be achieved.

[0012] Optionally, an exhaust hole is arranged on the top of the mounting shell, and an exhaust fan is arranged in the exhaust hole, and the exhaust fan and the temperature sensor are signal-connected with the main control unit.

[0013] By arranging the exhaust fan, the cooling effect can be achieved.

[0014] Optionally, a wire hole is arranged on each side of the mounting shell for the wire to be connected.

[0015] By arranging the wire hole, the line connection is facilitated.

[0016] Optionally, a frame is arranged on the top of the mounting shell, a filter screen is fixedly arranged in the frame, and the filter screen blocks the exhaust fan.

[0017] By arranging the filter screen, the dust can be blocked.

[0018] Optionally, two L-shaped frames are symmetrically fixedly arranged on the top of the mounting shell, a connecting column is fixedly arranged on each of the two L-shaped frames, a return spring is sleeved on each of the two connecting columns, a fixed plate is slidingly sleeved on each of the two connecting columns, the two ends of the return spring are fixedly arranged on the side of the fixed plate and the L-shaped frame that are close to each other, the top of each of the two fixed plates is fixedly provided with a same synchronous rod, and each of the two fixed plates is located on one side of the frame.

[0019] By pulling the synchronous rod, the synchronous rod moves to drive the two fixed plates to move and compress the corresponding return springs, so that the positioning and installation of the frame can be released, the frame and the filter screen can be disassembled and cleaned, and the convenience and flexibility during use can be improved.

[0020] Optionally, the main control unit is composed of a microprocessor and a power management module, and the composite switch module is composed of a plurality of silicon controlled rectifiers connected in series.

[0021] Adopting the technical scheme, the plurality of thyristors are connected in series to form the composite switch module, so that each thyristor can be turned on or turned off to instantaneously cut off the circuit.

[0022] In summary, the application has the following advantages:

[0023] 1. In the novel application, the current data in the circuit is continuously collected by the current sensor and transmitted to the main control unit, which analyzes the received current data, calculates the current actual current value, compares it with the preset safety threshold, and controls each thyristor in the composite switch module to turn on or turn off, so that the circuit is instantaneously cut off. In the recovery stage, the main control unit continuously monitors the current situation and confirms that there is no abnormality before re-closing the circuit to resume normal operation, thereby improving the response speed of the overload protection device and ensuring that the circuit can be quickly cut off when an overload occurs to avoid equipment damage and safety hazards.

[0024] 2. In the novel application, the first positioning plate and the second positioning plate are pulled down to contact the corresponding main control unit and current sensor, and the corresponding first adjusting bolt and second adjusting bolt can be rotated to complete the positioning and installation of the corresponding first adjusting rod and second adjusting rod. At this time, rotating the fixing bolt can also complete the positioning and installation of the composite switch module. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic diagram of the overall structure of the application;

[0026] Figure 2 is a schematic diagram of the inside of the installation housing of the application;

[0027] Figure 3 is a schematic diagram of the cooling structure of the application;

[0028] Figure 4 is a schematic diagram of the dustproof structure of the application.

[0029] BRIEF DESCRIPTION OF DRAWINGS: In the figure: 1, installation housing; 2, shell door; 3, threading hole; 4, frame; 5, filter screen; 6, main control unit; 7, current sensor; 8, composite switch module; 9, first adjusting rod; 10, first adjusting bolt; 11, first positioning plate; 12, second adjusting rod; 13, second adjusting bolt; 14, second positioning plate; 15, mounting ear; 16, fixing bolt; 17, box body; 18, temperature sensor; 19, exhaust hole; 20, exhaust fan; 21, connecting column; 22, return spring; 23, L-shaped bracket; 24, fixed plate; 25, synchronous rod. DETAILED DESCRIPTION

[0030] The following will be described in conjunction with the accompanyingFigures 1-4 The application is further described in detail.

[0031] Please refer to Figures 1-3 A photovoltaic energy storage circuit overload protection device, comprising a mounting shell 1, a main control unit 6, a current sensor 7, a drive circuit and a composite switch module 8, the drive circuit in the application is the prior art in the field, therefore the specific circuit and the connection mode are not elaborated too much, the main control unit 6 is composed of a microprocessor and a power management module, the composite switch module 8 is composed of a plurality of thyristors connected in series, a shell door 2 hinged on one side of the mounting shell 1, a positioning mechanism arranged in the mounting shell 1 and used for positioning and installing the main control unit 6 and the current sensor 7, a cooling mechanism arranged at the top of the mounting shell 1 and a dustproof mechanism.

[0032] The positioning mechanism comprises a first adjusting rod 9 fixedly installed on the inner wall of the top of the mounting shell 1, a first positioning plate 11 fixedly installed at the telescopic end of the first adjusting rod 9, a second adjusting rod 12 fixedly installed at the bottom of the first positioning plate 11, a second positioning plate 14 fixedly installed at the telescopic end of the second adjusting rod 12, a first adjusting screw 10 and a second adjusting screw 13 respectively screwed on one side of the first adjusting rod 9 and the second adjusting rod 12, the first adjusting rod 9 and the second adjusting rod 12 are both composed of a sleeve and a sleeve rod and are embeddedly arranged, and the top of the composite switch module 8 is symmetrically fixedly installed with mounting ears 15, and the two mounting ears 15 are both screwed with fixing screws 16.

[0033] In use, the first positioning plate 11 and the second positioning plate 14 are moved downward by pulling, and are in contact with the corresponding main control unit 6 and the current sensor 7, at this time, the corresponding first adjusting screw 10 and the second adjusting screw 13 can be rotated, so that the positioning and installation of the corresponding first adjusting rod 9 and the second adjusting rod 12 can be completed, at this time, the fixing screw 16 is rotated, so that the positioning and installation of the composite switch module 8 can also be completed.

[0034] The current sensor 7 continuously collects current data in the circuit and transmits it to the main control unit 6, the main control unit 6 analyzes the received current data, calculates the current actual current value and compares it with the preset safety threshold value, if the actual current value exceeds the threshold value, the main control unit 6 immediately sends a disconnection instruction to the drive circuit, after the drive circuit receives the instruction, the drive circuit controls each thyristor in the composite switch module 8 to be turned on or turned off, so that the circuit is instantaneously cut off, in the recovery stage, the main control unit 6 continuously monitors the current condition, and re-closes the circuit after confirming that there is no abnormality, to restore normal work, which improves the response speed of the overload protection device, ensures that the circuit can be quickly cut off when overload occurs, avoids equipment damage and safety hazards, enhances the reliability and stability of the overload protection device, and reduces the misoperation and failure phenomenon caused by environmental factors;

[0035] In order to further improve the response speed and reliability of the system, a redundant design can be added in the main control unit 6, that is, two identical main control units 6 are set as backup, when one of the main control units 6 fails, the other main control unit 6 automatically takes over the work, ensures the continuity and stability of the system. In addition, on the basis of the composite switch module 8, intelligent diagnosis function can be introduced, through the built-in self-checking program, the state of each component is evaluated regularly, and early warning is given when potential hidden dangers are found, so that the maintenance personnel can take timely measures to prolong the service life of the equipment.

[0036] With reference to Figure 3 and Figure 4 , the cooling mechanism includes a box body 17 fixedly installed on one side of the inner wall of the mounting shell 1, a temperature sensor 18 arranged in the box body 17, an exhaust hole 19 opened at the top of the mounting shell 1, an exhaust fan 20 arranged in the exhaust hole 19, and the exhaust fan 20 and the temperature sensor 18 are signal connected with the main control unit 6, and the two sides of the mounting shell 1 are provided with wire holes 3 for wire connection.

[0037] In use, the temperature sensor 18 can sense the temperature inside the mounting shell 1, and control the exhaust fan 20 to ventilate and cool, so as to play a cooling role.

[0038] With reference to Figure 4 , the dustproof mechanism includes a frame 4 arranged on the top of the mounting shell 1, a filter screen 5 fixedly installed in the frame 4, the filter screen 5 shielding the exhaust fan 20, two L-shaped frames 23 fixedly installed on the top of the mounting shell 1, two connecting columns 21 fixedly installed on the two L-shaped frames 23, two reset springs 22 sleeved on the two connecting columns 21, two fixed plates 24 slidingly sleeved on the two connecting columns 21, the two ends of the reset spring 22 are fixedly installed on the fixed plate 24 and the L-shaped frame 23 respectively, and the top of the two fixed plates 24 is fixedly installed with a same synchronous rod 25, and the two fixed plates 24 are located on one side of the frame 4.

[0039] In use, by pulling the synchronous rod 25, the synchronous rod 25 moves to drive the two fixed plates 24 to move and compress the corresponding reset spring 22, at this time, the positioning and installation of the frame 4 can be removed, so that the frame 4 and the filter screen 5 can be disassembled and cleaned, thereby improving the convenience and flexibility during use.

[0040] The implementation principle of the present application is: in use, first, pull down the first positioning plate 11 and the second positioning plate 14 to move downwards and contact the corresponding main control unit 6 and the current sensor 7, at this time, the corresponding first adjusting bolt 10 and the second adjusting bolt 13 can be rotated to complete the positioning and installation of the corresponding first adjusting rod 9 and the second adjusting rod 12, at this time, the fixing bolt 16 is rotated to complete the positioning and installation of the composite switch module 8;

[0041] When the photovoltaic energy storage system is running normally, the current sensor 7 continuously collects current data in the circuit and transmits it to the main control unit 6, the main control unit 6 analyzes the received current data, calculates the current actual current value and compares it with the preset safety threshold value, if the actual current value exceeds the threshold value, the main control unit 6 immediately sends a disconnection instruction to the drive circuit, after receiving the instruction, the drive circuit controls each thyristor in the composite switch module 8 to turn on or turn off, so that the circuit is instantaneously cut off, in the recovery stage, the main control unit 6 continuously monitors the current situation, and after confirming that there is no abnormality, the circuit is re-closed to restore normal work, which improves the response speed of the overload protection device, ensures that the circuit can be quickly cut off when an overload occurs, avoids equipment damage and safety hazards, enhances the reliability and stability of the overload protection device, reduces the misoperation and failure phenomenon caused by environmental factors, reduces the manufacturing and maintenance cost of the overload protection device, and makes it more suitable for large-scale popularization and application.

[0042] The temperature sensor 18 can sense the temperature inside the installation housing 1 and control the start of the exhaust fan 20 to ventilate and cool down, thereby playing a role in cooling down. By pulling the synchronous rod 25, the synchronous rod 25 moves and drives the two fixed plates 24 to move and compress the corresponding return springs 22, at this time, the positioning and installation of the frame 4 can be released, thereby the frame 4 and the filter screen 5 can be disassembled and cleaned, thereby improving the convenience and flexibility in use.

[0043] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. An overload protection device for a photovoltaic energy storage circuit, characterized in that: It includes a mounting housing (1), a main control unit (6), a current sensor (7), a drive circuit and a composite switch module (8). A door (2) is hinged to one side of the mounting housing (1). A positioning mechanism for positioning and installing the main control unit (6) and the current sensor (7) is provided inside the mounting housing (1). The positioning mechanism includes a first adjusting rod (9) fixedly installed on the inner wall of the top of the mounting housing (1). A first positioning plate (11) is fixedly installed on the telescopic end of the first adjusting rod (9). A second adjusting rod (12) is fixedly installed on the bottom of the first positioning plate (11). A second positioning plate (14) is fixedly installed on the telescopic end of the second adjusting rod (12). A first adjusting bolt (10) and a second adjusting bolt (13) are screwed onto one side of the first adjusting rod (9) and the second adjusting rod (12), respectively. The first adjusting rod (9) and the second adjusting rod (12) are both composed of a sleeve and a sleeve rod, and are designed for fitting together.

2. The photovoltaic energy storage circuit overload protection device according to claim 1, characterized in that: The top of each composite switch module (8) is symmetrically fixed with mounting ears (15), and each mounting ear (15) is screwed with a fixing bolt (16).

3. The photovoltaic energy storage circuit overload protection device according to claim 1, characterized in that: A box (17) is fixedly installed on one side of the inner wall of the mounting shell (1), and a temperature sensor (18) is provided inside the box (17).

4. The photovoltaic energy storage circuit overload protection device according to claim 3, characterized in that: The top of the mounting housing (1) is provided with an exhaust hole (19), and an exhaust fan (20) is provided inside the exhaust hole (19). The exhaust fan (20) and the temperature sensor (18) are both connected to the main control unit (6) for signal transmission.

5. The photovoltaic energy storage circuit overload protection device according to claim 1, characterized in that: Both sides of the mounting housing (1) are provided with wire holes (3) for wires to be connected through the holes.

6. The photovoltaic energy storage circuit overload protection device according to claim 4, characterized in that: The top of the mounting housing (1) is provided with a frame (4), and a filter (5) is fixedly installed inside the frame (4), which covers the exhaust fan (20).

7. The photovoltaic energy storage circuit overload protection device according to claim 6, characterized in that: Two L-shaped frames (23) are symmetrically fixedly installed on the top of the mounting housing (1). A connecting column (21) is fixedly installed on each of the two L-shaped frames (23). A reset spring (22) is sleeved on each of the two connecting columns (21). A fixing plate (24) is slidably sleeved on each of the two connecting columns (21). The two ends of the reset spring (22) are respectively fixedly installed on the side of the fixing plate (24) and the L-shaped frame (23) that are close to each other. The same synchronizing rod (25) is fixedly installed on the top of the two fixing plates (24). The two fixing plates (24) are located on one side of the frame (4).

8. The photovoltaic energy storage circuit overload protection device according to claim 1, characterized in that: The main control unit (6) consists of a microprocessor and a power management module, and the composite switch module (8) is composed of multiple thyristors connected in series.

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