Intelligent detection system for branch current of combiner box

Abstract

The utility model discloses an intelligent detection system for branch current of a combiner box. The intelligent detection system comprises a 16-path straight-through Hall direct current transformer, a first IDC puncture-type connector, a second IDC puncture-type connector, a 16-bit analog-to-digital converter detection circuit, a microprocessor, an 8-path nixie tube display circuit, an RS-485 lightning protection output circuit and a power supply isolation circuit. According to the invention, the modular design is adopted, and the straight-through Hall current sensor and the signal processing circuit are adopted, so that the accurate detection of the current of the photovoltaic battery pack string is ensured, and the stability and economic benefits of a photovoltaic power generation system are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation, and in particular to an intelligent detection system for the branch current of a busbar box. Background Art

[0002] In the prior art, in order to timely and efficiently understand the operating conditions of the branch current branches connected to the busbar box, the current detection circuit board and the main control board of the existing photovoltaic busbar box are integrated. As the operating time increases, the components on the circuit board will gradually age. After a failure occurs, the entire circuit board needs to be replaced, which is costly and affects the safe and stable operation of the photovoltaic power generation system. Summary of the Invention

[0003] Object of the Invention: The present invention provides an intelligent detection system for the branch current of a busbar box, which adopts a modular design and a through-hole Hall DC current sensor and a signal processing circuit to ensure accurate detection of the current of a photovoltaic battery string, and greatly improves the stability and economic benefits of the photovoltaic power generation system.

[0004] Technical Solution: The intelligent detection system for the branch current of a busbar box described in the present invention includes: 16 through-hole Hall DC current transformers, a first IDC piercing connector, a second IDC piercing connector, a 16-bit analog-to-digital converter detection circuit, a microprocessor, an 8-segment digital tube display circuit, an RS-485 lightning protection output circuit, and a power isolation circuit; the output signals of the 16 through-hole Hall DC current transformers are given to the first IDC piercing connector, and the collected signals are transmitted to the second IDC piercing connector through an FC flat cable connection, and are given to the microprocessor for arithmetic processing through a high-precision 16-bit analog-to-digital converter detection circuit and output to the 8-segment digital tube display circuit and the RS-485 lightning protection output circuit, and the signals of the RS-485 lightning protection output circuit are transmitted to a remote monitoring center or a host computer through an RS-485 communication protocol, and the power isolation module provides an input power supply and outputs a stable 5V through the power isolation circuit to supply the power required by the above circuits.

[0005] Further, the 16 through-hole Hall DC current transformer acquisition module allows the positive poles of each photovoltaic busbar inside the busbar box to pass through the 16 through-hole Hall DC current transformers respectively through a through-hole design, and each through-hole Hall DC current transformer corresponds to 1 branch, and the current signals of 16 branches can be collected simultaneously.

[0006] Further, the current signals of 16 branches are connected to the second IDC piercing connector through an FC flat cable, and are respectively transmitted to 4 high-precision 16-bit analog-to-digital converter detection circuits through an RC low-pass filter circuit and a diode connected to prevent the input signal from overvoltage breakdown of the subsequent circuit, and then are processed by the microprocessor through an I2C communication protocol.

[0007] Furthermore, the power isolation module provides a 5V power supply access to the pluggable terminal block CN4 for the input power circuit. After passing through the power isolation circuit, a stable and reliable 5V power supply is output to supply the power required by the circuit, and at the same time, the power indicator circuit indicator light works.

[0008] Furthermore, the microprocessor uses the STC15W4K56S4 single-chip microcomputer.

[0009] Furthermore, Schottky diode clamping protection is provided between the 16-channel through-hole Hall DC current transformer and the 16-bit analog-to-digital converter detection circuit.

[0010] Beneficial effects: The present invention has the characteristics of high precision, modularization, scalability, remote monitoring, and intelligent management, and can significantly improve the stability and economic benefits of the photovoltaic power generation system. Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the system structure of the present invention.

[0012] Figure 2 It is a schematic diagram of the microprocessor structure of the present invention.

[0013] Figure 3 It is a connection diagram of the 16-channel through-hole Hall DC current transformer and the first IDC piercing connector of the present invention.

[0014] Figure 4 It is a connection diagram of the second IDC piercing connector, the 16-bit analog-to-digital converter detection circuit, and the microprocessor of the present invention.

[0015] Figure 5 It is a connection diagram of the microprocessor, the 8-digit digital tube display circuit, and the RS-485 lightning protection output circuit of the present invention.

[0016] Figure 6 It is a structure diagram of the power isolation circuit, the power indicator circuit, and the input power circuit of the present invention. Detailed Embodiments

[0017] Such as Figure 1As shown in the figure, an intelligent detection system for the branch current of a busbar box includes: 16 through-hole Hall DC current transformers 1, a first IDC piercing connector 2, a second IDC piercing connector 3, a 16-bit analog-to-digital converter detection circuit 4, a microprocessor 5, an 8-digit LED display circuit 6, an RS-485 lightning protection output circuit 7, and a power isolation circuit 8. The 16 through-hole Hall DC current transformers 1 output signals to the first IDC piercing connector 2, and the collected signals are transmitted to the second IDC piercing connector 3 through an FC flat cable connection. After being processed by the high-precision 16-bit analog-to-digital converter detection circuit 4, the signals are output to the microprocessor 5 for operation and then given to the 8-digit LED display circuit 6 and the RS-485 lightning protection output circuit 7. The signals of the RS-485 lightning protection output circuit 7 are transmitted to a remote monitoring center or a host computer through the RS-485 communication protocol. The power isolation module provides an input power supply, and after passing through the power isolation circuit 8, a stable 5V is output to supply the power required by the above circuits.

[0018] As Figure 2 shown, the microprocessor 5 uses an STC15W4K56S4 single-chip microcomputer. The data measured by the 16-bit analog-to-digital converter detection circuit 4 is transmitted to the corresponding port of the STC15W4K56S4 single-chip microcomputer. After A / D conversion, the corresponding digital signal is calculated, and all the data is transmitted to a remote monitoring center or a host computer through a connected lightning protection RS485 communication module. By using 16 through-hole Hall DC current transformers, accurate detection of the current of a photovoltaic battery string can be achieved. This greatly simplifies the complexity of installation and maintenance, and at the same time improves the accuracy and stability of measurement. Cooperating with a high-precision 16-bit analog-to-digital converter ensures the accuracy of current signal conversion, thereby enhancing the stability and reliability of the entire photovoltaic power generation system.

[0019] As Figure 3 shown, the 16 through-hole Hall DC current transformer acquisition module, through the through-hole design, allows the positive pole of each photovoltaic busbar inside the busbar box to pass through the 16 through-hole Hall DC current transformers 1 respectively. Each through-hole Hall DC current transformer 1 corresponds to one branch, and the current signals of 16 branches can be collected simultaneously. To prevent the overvoltage signals output by the 16 through-hole Hall DC current transformers from breaking down the subsequent 16-bit analog-to-digital converter circuit, a Schottky diode clamping protection design is adopted, which effectively prevents the input signal overvoltage from damaging the subsequent circuit, and further improves the safety and stability of the system.

[0020] As Figure 4As shown, the current signals of 16 branches are connected to the second IDC piercing connector 3 through an FC flat cable, and are connected to the diode after passing through an RC low-pass filter circuit to prevent the input signal from overvoltage breakdown of the subsequent circuit, and the signals are respectively transmitted to 4 high-precision 16-bit analog-to-digital converter detection circuits 4, and then processed by the microprocessor 5 through the I2C communication protocol.

[0021] As Figure 5 shown, the microprocessor 5 outputs the operation processing results to the 8-segment digital tube display circuit 6 and the RS-485 lightning protection output circuit 7. Through the RS-485 lightning protection output circuit and the RS-485 communication protocol, the detected current data can be transmitted to the remote monitoring center or the host computer in real time, realizing the remote monitoring and intelligent management of the photovoltaic power generation system. This not only improves the management efficiency of the system, but also can discover and handle potential problems in the first time, avoiding economic losses caused by system failures.

[0022] As Figure 6 shown, the power isolation module provides a 5V power supply to the pluggable terminal block CN4 for the input power supply circuit 10, and outputs a stable and reliable 5V power supply to the required circuit power supply after passing through the power isolation circuit 8. At the same time, the indicator light of the power index circuit 9 works.

[0023] The intelligent detection system of the present invention adopts a modular design, including independent current acquisition module, signal processing module, display module, communication module, etc. This design is not only convenient for the assembly and maintenance of the system, but also has good scalability. Since the present invention can realize the accurate detection and remote monitoring of the current of the photovoltaic battery string, it can discover and handle problems such as abnormal current in time, thus avoiding the power generation loss caused by system failures. In addition, through intelligent management, the operation efficiency of the photovoltaic power generation system can be optimized, and the economic benefits can be further improved.

Claims

1. An intelligent detection system for the branch current of a busbar trunking, characterized in that, Including: 16-channel through-hole Hall DC current transformer (1), first IDC piercing connector (2), second IDC piercing connector (3), 16-bit analog-to-digital converter detection circuit (4), microprocessor (5), 8-channel digital tube display circuit (6), RS-485 lightning protection output circuit (7) and power isolation circuit (8); The output signal of the 16-channel through-hole Hall DC current transformer (1) is given to the first IDC piercing connector (2), and the acquired signal is transmitted to the second IDC piercing connector (3) through an FC flat cable connection. After being detected by the high-precision 16-bit analog-to-digital converter detection circuit (4), it is given to the microprocessor (5) for operation and processing, and then output to the 8-channel digital tube display circuit (6) and RS-485 lightning protection output circuit (7). The signal of the RS-485 lightning protection output circuit (7) is transmitted to the remote monitoring center or the upper computer through the RS-485 communication protocol. The power isolation module provides the input power supply, and after passing through the power isolation circuit (8), a stable 5V is output to supply the power required by the above circuits.

2. The intelligent detection system for the branch current of the busbar box according to claim 1, characterized in that, 16-channel through-hole Hall DC current transformer acquisition module. Through the through-hole design, each positive pole of the photovoltaic busbar inside the busbar box is allowed to pass through the 16-channel through-hole Hall DC current transformer (1) respectively.

3. The intelligent detection system for the branch current of the busbar box according to claim 2, wherein, Each through-hole Hall DC current transformer (1) corresponds to 1 branch, and the current signals of 16 branches can be collected simultaneously.

4. The intelligent detection system for the branch current of the busbar box according to claim 1, wherein, The current signals of 16 branches are connected to the second IDC piercing connector (3) through an FC flat cable. After passing through an RC low-pass filter circuit and preventing the input signal from overvoltage breakdown of the subsequent circuit by connecting a diode, the signals are respectively transmitted to 4 high-precision 16-bit analog-to-digital converter detection circuits (4), and then processed by the microprocessor (5) through the I2C communication protocol.

5. The intelligent detection system for the branch current of the busbar box according to claim 1, characterized in that A Schottky diode clamping protection is set between the 16-channel through-hole Hall DC current transformer (1) and the 16-bit analog-to-digital converter detection circuit (4).

6. The intelligent detection system for the branch current of the busbar box according to claim 1, wherein The microprocessor (5) uses an STC15W4K56S4 single-chip microcomputer.

7. The intelligent detection system for the branch current of the busbar box according to claim 1, characterized in that, The power isolation module provides a 5V power supply and accesses the pluggable wiring terminal CN4 to supply the input power supply circuit (10). After passing through the power isolation circuit (8), a stable and reliable 5V power supply is output to supply the power required by the circuit. At the same time, the indicator light of the power index circuit (9) works.

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