Fault alarm protection circuit and safety device

Abstract

The utility model provides a fault alarm protection circuit and a safety device, and the circuit comprises a photovoltaic circuit which comprises a positive electrode circuit and a negative electrode circuit which are connected in series, the positive electrode circuit is provided with a first resistor, and the negative electrode circuit is provided with a second resistor; the protection circuit comprises a fuse, and the fuse is connected with the negative electrode circuit in series; and the alarm circuit is connected with the photovoltaic circuit in series and comprises an inverter, when the circuit current is lower than a preset parameter, the alarm circuit is short-circuited, and when the circuit current is not lower than the preset parameter, the alarm circuit is switched on. The first resistor and the second resistor respectively protect the whole circuit and the cathode circuit of the photovoltaic circuit, and the above structure cooperates with the fuse arranged in parallel, so that when a grounding fault occurs, the overall safety of the circuit can be ensured, and the circuit can be maintained and repaired only by changing the external resistance wire. The method has the remarkable advantages of economy, reliability, simplicity and convenience in operation, high safety degree and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of protection circuits, in particular to a fault alarm protection circuit and a safety device. Background Art

[0002] In the field of design and manufacturing of contemporary electronic equipment, the safety and reliability of alarm circuits have always been the focus of engineers. At present, the mainstream alarm circuit design adopts a combination of fuses and Hall sensors, in which the fuse is installed on the circuit board, and the Hall sensor is connected in series in the circuit path of the fuse to monitor the change of current. This design converts the current flowing through the fuse into a voltage signal, which is then amplified by the op amp circuit. Finally, when the leakage current exceeds the set threshold, the CPU sends an alarm signal.

[0003] However, this traditional alarm circuit design has exposed some significant deficiencies in practical applications. First, although the introduction of the Hall sensor improves the accuracy of current monitoring, its high cost has become a problem in the overall cost control of the circuit. The Hall sensor is not only expensive in itself, but also requires additional power supply support when used in the circuit, which not only increases the energy consumption of the circuit, but also makes the overall design of the circuit more complicated. This complexity not only increases the difficulty of design, but also in the long-term operation of the circuit, each additional connection point and component may become a potential unstable factor, reducing the reliability of the circuit.

[0004] In addition, when the fuse is damaged due to overload, the existing alarm circuit design requires a cumbersome replacement process. The operator must first disassemble the equipment and then remove the glue that fixes the fuse before replacing the fuse. This process not only consumes a lot of manpower and time, but also may introduce new failure points due to improper operation when reassembling the equipment, further increasing the complexity and cost of maintenance. Summary of the invention

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the problem that the alarm circuit structure in the prior art is complicated and inconvenient for repair and maintenance, and to provide a fault alarm protection circuit and a safety device.

[0006] In order to solve the above technical problems, the utility model provides a fault alarm protection circuit, which includes: a photovoltaic circuit, the photovoltaic circuit includes a positive circuit and a negative circuit arranged in series, wherein the positive circuit is provided with a first resistor, and the negative circuit is provided with a second resistor; a protection circuit, the protection circuit includes a fuse, and the fuse is arranged in series with the negative circuit; an alarm circuit, the alarm circuit is arranged in series with the photovoltaic circuit, and includes an inverter, when the circuit current is lower than a preset parameter, the alarm circuit is in a short-circuit state, when the circuit current is not lower than the preset parameter, the alarm circuit is connected to the photovoltaic circuit.

[0007] In one embodiment of the present invention, it also includes a processing system, and the processing system is connected to the inverter.

[0008] In one embodiment of the present invention, the first resistor and the second resistor are both chip resistors, and the resistance values ​​of the first resistor and the second resistor are both not less than 100KΩ.

[0009] In one embodiment of the utility model, a waterproof structure is provided on the protection circuit.

[0010] In an embodiment of the present invention, the preset parameter is 1A.

[0011] In one embodiment of the present invention, the alarm circuit further includes a third resistor, and the third resistor is connected in series with the inverter.

[0012] In one embodiment of the present invention, the alarm circuit further includes a filter component, and the filter component is connected in series with the inverter.

[0013] In one embodiment of the present invention, the filtering component includes a fourth resistor and a capacitor, and the fourth resistor is connected in parallel with the capacitor.

[0014] In one embodiment of the present invention, the alarm circuit further includes a test point.

[0015] The utility model also provides a safety device, which comprises the above-mentioned fault alarm protection circuit.

[0016] The above technical solution of the utility model has the following advantages compared with the prior art:

[0017] The fault alarm protection circuit and safety device described in the utility model respectively provide critical protection for the whole machine circuit and the negative circuit through the first resistor and the second resistor, thereby ensuring the safety of the circuit under abnormal conditions. These resistors not only stabilize the current and voltage under normal working conditions, but also respond in time and trigger protective measures when potential faults are detected. Another notable feature of the protection circuit is that it is combined with a fuse arranged in parallel to form a dual protection system. In emergency situations such as ground faults, the fuse can be quickly blown to cut off the fault current, prevent the fault from spreading, and protect the circuit from damage. This design not only ensures the overall safety of the circuit, but also greatly improves the reliability of the system. When the fuse is blown, the maintenance personnel only need to replace the external resistance wire to quickly restore the normal operation of the circuit without complicated maintenance procedures. This design greatly simplifies maintenance operations, reduces maintenance costs, and also shortens system downtime. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0019] Figure 1 This is a fault alarm protection circuit diagram in a preferred embodiment of the utility model;

[0020] Figure 2 yes Figure 1 The fuse connection diagram in the fault alarm protection circuit shown;

[0021] Figure 3 yes Figure 1 The schematic diagram of the photovoltaic circuit in the fault alarm protection circuit is shown.

[0022] Explanation of the reference numerals in the specification: 100, photovoltaic circuit; 110, photovoltaic positive pole; 120, photovoltaic negative pole; 130, first resistor; 140, second resistor; 200, fuse; 300, alarm circuit; 310, filter component; 311, fourth resistor; 312, capacitor; 320, inverter; 330, test point; 340, third resistor. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0024] Embodiment 1

[0025] See also Figure 1As shown, this embodiment provides a fault alarm protection circuit, which includes: a photovoltaic circuit 100, wherein the photovoltaic circuit 100 includes a positive circuit and a negative circuit arranged in series, wherein the positive circuit is provided with a first resistor 130, and the negative circuit is provided with a second resistor 140; a fuse 200, wherein the fuse 200 is arranged in series with the negative circuit; an alarm circuit 300, wherein the alarm circuit 300 is arranged in series with the photovoltaic circuit 100, and includes an inverter 320, when the circuit current is lower than a preset parameter, the alarm circuit 300 is in a short-circuit state, and when the circuit current is not lower than the preset parameter, the alarm circuit 300 is connected to the photovoltaic circuit 100.

[0026] The fault alarm protection circuit described in this embodiment, through the first resistor 130 and the second resistor 140, respectively performs critical protection on the whole machine circuit and the negative circuit, ensuring the safety of the circuit under abnormal conditions. These resistors not only play the role of stabilizing current and voltage under normal working conditions, but also can respond in time and trigger protection measures when potential faults are detected. Another notable feature of the protection circuit is that it is combined with the fuse 200 arranged in parallel to form a double protection system. In emergency situations such as ground faults, the fuse 200 can be quickly blown, cut off the fault current, prevent the fault from spreading, and protect the circuit from damage. This design not only ensures the overall safety of the circuit, but also greatly improves the reliability of the system. Furthermore, when the fuse 200 is blown, the maintenance personnel only need to replace the external resistance wire to quickly restore the normal operation of the circuit without complicated maintenance process. This design greatly simplifies maintenance operations, reduces maintenance costs, and also shortens system downtime.

[0027] See also Figure 1 and Figure 2As shown, the current in this embodiment flows from the photovoltaic positive electrode 110 to the photovoltaic negative electrode 120 under normal working conditions, and the fuse 200 is arranged in parallel between the photovoltaic negative electrode 120 and its ground terminal. In the actual processing process, it is necessary to first reserve the bayonet processing for the installation position of the photovoltaic negative electrode 120 and the corresponding ground terminal, so that the fuse 200 can be repeatedly disassembled and replaced outside the photovoltaic circuit 100. Further, in order to improve the safety and stability of this circuit during use, a waterproof structure is also provided between the reserved bayonet in this embodiment and the connection part of the fuse 200. Specifically, the waterproof structure in this embodiment is arranged on the outer surface of the fuse 200, which is preferably a waterproof sealing ring, and is arranged between the protection circuit and the photovoltaic circuit 100 and the ground terminal. When it is necessary to install the corresponding fuse 200 in this circuit, it is necessary to first insert the two ends of the protection circuit into the corresponding two reserved bayonet, and then fill the waterproof sealing ring at the corresponding installation gap. In other embodiments, the waterproof structure can also be configured as other structures or materials, and the utility model does not make specific restrictions on this.

[0028] In this embodiment, the first resistor 130 and the second resistor 140 are both chip resistors, and the resistance of the first resistor 130 and the second resistor 140 is not less than 100KΩ. Further, based on the above structural setting, the preset parameter in this embodiment is 1A. In this embodiment, the selection of chip resistors not only makes the circuit more compact, but also achieves a significant improvement in production efficiency through automated surface mounting technology. High-resistance chip resistors play a role in limiting the flow of current in the circuit, ensuring the safety and stability of the circuit, and also provide necessary protection for the circuit to prevent damage to sensitive components due to overcurrent.

[0029] See also Figure 3 As shown, the alarm circuit 300 in this embodiment also includes a third resistor 340, and the third resistor 340 is arranged in series with the inverter 320. Furthermore, in this embodiment, in order to improve the overall safety of the alarm circuit 300, three third resistors 340 are correspondingly arranged to perform current limiting protection on the alarm circuit 300.

[0030] Furthermore, the alarm circuit 300 in this embodiment also includes a filter component 310, which is arranged in series with the inverter 320. It not only helps to suppress the high-frequency noise that may be generated by the inverter 320 during the conversion of direct current into alternating current, but also optimizes the output waveform to make it closer to the ideal sine wave, thereby reducing electromagnetic interference to the connected device. At the same time, the filter component 310 is also responsible for stabilizing the output voltage of the inverter 320, smoothing the current, reducing voltage fluctuations and current spikes, thereby protecting the connected device from damage. In addition, the filter component 310 also plays a role in impedance matching, adjusting the electrical characteristics between the inverter 320 and the load to improve the energy transmission efficiency. Specifically, the filter component 310 in this embodiment includes a fourth resistor 311 and a capacitor 312, and the fourth resistor 311 is arranged in parallel with the capacitor 312.

[0031] In this embodiment, in the alarm circuit 300, the filter component 310 adopts a configuration in which the fourth resistor 311 and the capacitor 312 are connected in parallel. The operator can achieve a highly customized filtering effect for a specific frequency range by precisely adjusting the parameters of the fourth resistor 311 and the capacitor 312. Such a configuration can effectively attenuate high-frequency noise while maintaining the main characteristics of the signal and ensuring the stability and smoothness of the output waveform.

[0032] In this embodiment, the alarm circuit 300 further includes a test point 330. The test point 330 is used as a key access point in the circuit, allowing the operator to directly measure and monitor the circuit's voltage, current and other parameters, thereby performing effective debugging and fault diagnosis without destroying the circuit's integrity. Their presence greatly simplifies the process of monitoring circuit performance, allowing engineers to promptly discover and resolve performance degradation or abnormal conditions, ensuring stable operation of the circuit, thereby not only improving functionality and practicality, but also making the circuit more stable and easier to maintain.

[0033] This embodiment also includes a processing system, which is connected to the inverter 320. When the photovoltaic circuit 100 has a grounding fault or other faults, the leakage current will flow through the fuse 200. When the leakage current is greater than 1A, the fuse 200 is disconnected. At this time, the photovoltaic negative pole 120 is not grounded, causing the leakage current to flow to the alarm circuit 300. At this time, the alarm circuit 300 provides real-time feedback to the processing system to drive the inverter 320 to stop working, thereby protecting the entire power generation system.

[0034] Embodiment 2

[0035] This embodiment provides a safety device, which includes the above-mentioned fault alarm protection circuit.

[0036] In summary, the fault alarm protection circuit and safety device described in the present invention protect the entire circuit and the negative circuit of the photovoltaic circuit 100 respectively through the first resistor 130 and the second resistor 140, and the above structure cooperates with the fuse 200 arranged in parallel. When a grounding fault occurs, it can not only ensure the overall safety of the circuit, but also only needs to replace the external resistor to achieve circuit maintenance and repair. Compared with conventional protection circuits, the present application has significant advantages such as economy and reliability, simple operation and high safety.

[0037] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A fault alarm protection circuit, characterized in that: include: A photovoltaic circuit, the photovoltaic circuit comprising a positive circuit and a negative circuit connected in series, wherein the positive circuit is provided with a first resistor, and the negative circuit is provided with a second resistor; A protection circuit, the protection circuit comprising a fuse, the fuse being arranged in series with the negative electrode circuit; The alarm circuit is arranged in series with the photovoltaic circuit, and includes an inverter. When the circuit current is lower than a preset parameter, the alarm circuit is in a short-circuit state. When the circuit current is not lower than the preset parameter, the alarm circuit is connected to the photovoltaic circuit.

2. The fault alarm protection circuit according to claim 1 is characterized in that: It also includes a processing system, which is connected to the inverter.

3. The fault alarm protection circuit according to claim 1, characterized in that: The first resistor and the second resistor are both chip resistors, and the resistance values ​​of the first resistor and the second resistor are not less than 100KΩ.

4. The fault alarm protection circuit according to claim 1, characterized in that: A waterproof structure is provided on the protection circuit.

5. The fault alarm protection circuit according to claim 1, characterized in that: The preset parameter is 1A.

6. The fault alarm protection circuit according to claim 1, characterized in that: The alarm circuit further includes a third resistor, which is arranged in series with the inverter.

7. The fault alarm protection circuit according to claim 1, characterized in that: The alarm circuit further comprises a filter component, and the filter component is arranged in series with the inverter.

8. The fault alarm protection circuit according to claim 7, characterized in that: The filtering component includes a fourth resistor and a capacitor, and the fourth resistor is arranged in parallel with the capacitor.

9. The fault alarm protection circuit according to claim 1, characterized in that: The alarm circuit also includes a test point.

10. A safety device, characterized in that: The invention comprises the fault alarm protection circuit as described in any one of claims 1 to 9.

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