Battery ia protection plate for portable mining intrinsic safety type equipment

Abstract

The utility model discloses a battery ia protection plate for portable mining intrinsic safety type equipment, and relates to a battery protection technology. The battery ia protection board comprises an input unit, a protection circuit and an output unit, the input unit is connected with a battery, and the output unit is connected with the input unit and used for outputting power to mining intrinsic safety type equipment; the protection circuit comprises a protection control unit, a current limiting unit and a fusing unit which are connected between the input unit and the output unit in series, the protection control unit is used for cutting off power output of the output unit when it is detected that output current of the protection circuit is larger than a set value, the current limiting unit is used for limiting the magnitude of the output current, and the fusing unit is used for fusing the output current. The fusing unit is used for changing into a fusing state when the output current exceeds the set value. According to the utility model, three-layer protection measures are provided, the high-standard requirement of ia protection grade is met, and the reliability of mining intrinsic safety type equipment and the operation safety of miners are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery protection, in particular to a battery ia protection board for a portable intrinsically safe mine equipment. Background Technique

[0002] The explosion-proof standard requires that there are three protection levels for coal mine products, namely ia, ib and ic. 90% of the commonly used coal mine equipment adopts the ib protection level. Due to the increasing requirements, for some equipment in very high-risk working areas, the ib protection level is no longer sufficient to meet the safety requirements. Therefore, the protection level of the equipment used in very high-risk working areas is raised to ia.

[0003] In the early stage, it was required that some commonly used fixed intrinsically safe mine equipment should reach the ia protection level when used in very high-risk working areas. Later, it was found that portable equipment was also often carried by workers into very high-risk working areas. Therefore, the protection level of portable equipment also needs to reach the ia protection level.

[0004] The requirements for the ia protection level are relatively high and at least three layers of protection treatment are required. In the related art, there is a lack of a battery ia protection solution applicable to portable intrinsically safe mine equipment. Content of the Utility Model

[0005] Aiming at the above technical problems and defects, the purpose of the utility model is to provide a battery ia protection board for a portable intrinsically safe mine equipment, which integrates a protection control unit, a current limiting unit and a fusing unit to provide three layers of protection measures, meets the high-standard requirements of the ia protection level, and improves the reliability of the intrinsically safe mine equipment and the operation safety of miners.

[0006] To achieve the above purpose, the utility model provides a battery ia protection board for a portable intrinsically safe mine equipment, including an input unit, a protection circuit and an output unit. The input unit is connected to the battery, and the output unit is connected to the input unit for outputting power to the intrinsically safe mine equipment. The protection circuit includes a protection control unit, a current limiting unit and a fusing unit connected in series between the input unit and the output unit. The protection control unit is used to cut off the power output of the output unit when detecting that the output current of the protection circuit is greater than the set value. The current limiting unit is used to limit the magnitude of the output current, and the fusing unit is used to change to a fusing state when the output current exceeds the set value.

[0007] Using the above battery ia protection board, its protection circuit integrates three protection mechanisms: a protection control unit, a current limiting unit, and a fusing unit, achieving strict monitoring and control of the battery output current. Firstly, the current limiting unit effectively reduces the current intensity to prevent overload. Secondly, the protection control unit is responsible for real-time detection of the current status. Once it detects that the current exceeds the set value (safety threshold), it immediately cuts off the current output. Thirdly, if the protection control unit fails to cut off the circuit in time and the current abnormally rises to a dangerous level, the fusing unit, as the last line of defense, will automatically fuse to physically cut off the current path, ensuring the safety of the device and personnel. The organic combination of these three protection measures not only meets the high standards of the ia protection level but also provides strong guarantee for the safe operation of the device in high-risk environments, significantly enhancing the reliability of mine intrinsically safe devices and the operation safety of miners.

[0008] In some embodiments, the protection control unit includes a detection unit and a control unit. The control unit is connected to the current limiting unit, the current limiting unit is connected to the fusing unit, and the fusing unit is connected to the output unit. The detection unit is configured to send a control signal to the control unit when it detects that the output current is greater than the set value, so that the control unit becomes in a cut-off state.

[0009] Adopting this embodiment, by subdividing the protection control unit into a detection unit and a control unit and realizing effective connection among the detection unit, the control unit, the current limiting unit, and the fusing unit, the detection and response speed of current anomalies are significantly improved. This design ensures that when the current exceeds the safety threshold, the power output can be quickly cut off, effectively preventing overload and short circuit, and enhancing the safety performance and reliability of the system.

[0010] In some embodiments, the detection unit includes a plurality of current detection chips, and the current detection chips are connected in parallel with each other.

[0011] Adopting this embodiment, by connecting multiple current detection chips in parallel, the accuracy and stability of current detection are improved. This design not only enhances the redundancy of the system, reduces the risk of single point of failure, but also improves the overall detection efficiency and accuracy by dispersing the detection tasks.

[0012] In some embodiments, the control unit includes a plurality of field effect transistors, and the field effect transistors are connected in parallel with each other.

[0013] Adopting this embodiment, by connecting multiple field effect transistors in parallel, the current control ability of the control unit is strengthened. This design not only improves the load-bearing capacity of the system but also reduces the thermal loss of a single component by sharing the current load, extends the service life, and improves the redundancy and stability of the system at the same time.

[0014] In some embodiments, the battery ia protection board further includes a voltage regulation unit, which is respectively connected to the input unit, the detection unit, and the control unit.

[0015] By adopting this embodiment, the introduction of the voltage regulation unit provides a stable voltage environment for the entire protection board, reduces the influence of voltage fluctuations on current control, and improves the stability and reliability of the system. This design is crucial for ensuring the stable operation of the device in high-risk environments.

[0016] In some embodiments, the voltage regulation unit includes a voltage regulation capacitor. The first end of the voltage regulation capacitor is respectively connected to the VDD pin of the current detection chip of the detection unit and the positive electrode of the input unit. The second end of the voltage regulation capacitor is respectively connected to the VSS pin of the current detection chip, the negative electrode of the input unit, and the control unit.

[0017] By adopting this embodiment, by using a voltage regulation capacitor in the voltage regulation unit, the voltage stability is further improved, the voltage supply of key components is ensured, the influence of voltage fluctuations on current detection and control is reduced, and the stability and anti-interference ability of the system are improved.

[0018] In some embodiments, the gate of the field effect transistor of the control unit is connected to the control signal output end of the current detection chip, and the source is respectively connected to the current limiting unit and the second end of the voltage regulation capacitor.

[0019] By adopting this embodiment, by connecting the gate of the field effect transistor of the control unit to the control signal output end of the detection unit, precise control of the current is achieved. This design improves the response speed of the system, enhances the control ability for abnormal current conditions, and effectively prevents equipment damage or safety accidents.

[0020] In some embodiments, the control signal output end includes a data signal output end and a clock signal output end. The gate of the field effect transistor includes a first gate and a second gate. The first gate is connected to the clock signal output end, and the second gate is connected to the data signal output end.

[0021] By adopting this embodiment, through the introduction of data signals and clock signals, as well as the dual-gate design of the field effect transistor, more complex control logic is achieved. This design improves the flexibility and precision of control, makes the current control more optimized, and reduces the electromagnetic interference during the current switching process.

[0022] In some embodiments, the battery ia protection board further includes a sampling resistor. One end of the sampling resistor is connected to the detection unit and the output unit, and the other end is connected to the control unit.

[0023] With this embodiment, the accuracy of current detection is further improved by introducing a sampling resistor. This design provides more accurate current information for the control unit, enabling the control unit to perform more precise control based on the real-time current state, thereby enhancing the stability and reliability of the system.

[0024] In some embodiments, the current limiting unit includes a plurality of current limiting resistors connected in series.

[0025] With this embodiment, by using a plurality of current limiting resistors connected in series in the current limiting unit, effective current limitation is achieved. This design not only improves the load-bearing capacity of the system, but also ensures that the current flows within a safe range through physical-level limitation, reducing the risk of abnormal current.

[0026] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0027] 1. Through the integrated protection control unit of the present utility model, the real-time performance and response speed of current monitoring are significantly improved. The coordinated operation of the detection unit and the control unit ensures that when the current rises abnormally, it can be quickly identified and measures can be taken. This rapid response mechanism effectively avoids overload and short-circuit situations, improving the safety and reliability of mining equipment in high-risk environments.

[0028] 2. By paralleling multiple current detection chips and field effect transistors, the present utility model enhances the redundancy and stability of the system. This design not only improves the accuracy of current detection and control, but also reduces the thermal loss of components and extends the service life by distributing the load. At the same time, even if some components fail, the system can still operate stably, ensuring the continuous operation ability of mining equipment.

[0029] 3. By introducing a voltage stabilizing unit and a current limiting unit, the present utility model realizes precise management and control of the power supply output. The voltage stabilizing unit ensures voltage stability and reduces the impact of voltage fluctuations on current control. The current limiting unit physically limits the magnitude of the current to prevent the current from abnormally rising to a dangerous level. These designs work together to improve the power management ability of mining equipment under extreme conditions and ensure the safety of the equipment and personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present utility model, and are used together with the specification to explain the principles of the present utility model. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. In the drawings:

[0031] Figure 1 It is a schematic diagram of the architecture of a battery ia protection board for a portable intrinsically safe mining device according to an embodiment of the present utility model;

[0032] Figure 2 It is a schematic diagram of the architecture of a protection circuit according to an embodiment of the present utility model;

[0033] Figure 3 It is a circuit schematic diagram of a protection circuit according to an embodiment of the present utility model;

[0034] Description of reference numerals:

[0035] 1. Input unit; 2. Protection circuit; 21. Protection control unit; 22. Current limiting unit; 23. Fuse unit; 211. Detection unit; 212. Control unit; 3. Output unit. Specific embodiments

[0036] The terms used in the following embodiments of the present utility model are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model. As used in the specification and appended claims of the present utility model, the singular forms "a", "an", "the", "above-mentioned", "said", and "this" are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "or" used in the present utility model refers to and includes any and all possible combinations of one or more of the listed items. Hereinafter, the terms "first" and "second" are only used for descriptive purposes to distinguish technical features, and should not be construed as implying relative importance or implicitly indicating the quantity of the indicated technical features. In the description of the embodiments of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0037] It should also be noted that, unless otherwise clearly defined and limited, in the embodiments of the present utility model, terms such as "set" and "connect" should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components; it can be a wired communication connection or a wireless communication connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. The embodiments of the present utility model are specifically described below.

[0038] An embodiment of the present utility model provides a battery ia protection board for a portable intrinsically safe mining device, which includes an input unit 1, a protection circuit 2 and an output unit 3. The input unit 1 is connected to the battery, and the output unit 3 is connected to the input unit 1 for outputting power to the intrinsically safe mining device. The protection circuit 2 includes a protection control unit 21, a current limiting unit 22 and a fusing unit 23 connected in series between the input unit 1 and the output unit 3. The protection control unit 21 is used to cut off the power output of the output unit 3 when detecting that the output current of the protection circuit 2 is greater than the set value. The current limiting unit 22 is used to limit the magnitude of the output current, and the fusing unit 23 is used to change to a fusing state when the output current exceeds the set value.

[0039] With the above battery ia protection board, its protection circuit 2 integrates three protection mechanisms: a protection control unit 21, a current limiting unit 22 and a fusing unit 23, realizing strict monitoring and control of the battery output current. Firstly, the current limiting unit 22 effectively reduces the current intensity to prevent overload. Secondly, the protection control unit 21 is responsible for real-time detection of the current state. Once it detects that the current exceeds the set value (safety threshold), it immediately cuts off the current output. Thirdly, if the protection control unit 21 fails to cut off the circuit in time and the current abnormally rises to a dangerous level, the fusing unit 23, as the last line of defense, will automatically fuse to physically cut off the current path, ensuring the safety of the device and personnel. The organic combination of these three protection measures not only meets the high-standard requirements of the ia protection level, but also provides a strong guarantee for the safe operation of the device in a high-risk environment, significantly improving the reliability of the intrinsically safe mining device and the operation safety of miners.

[0040] Exemplarily, assume a miner is operating a portable intrinsically safe mining device in a coal mine tunnel filled with gas. In such a high-risk environment, first of all, the current limiting unit 22 starts to work, effectively reducing the current intensity and preventing overload, protecting the device from current impact. At the same time, the protection control unit 21 monitors the current in real time. Once the current abnormally exceeds the set value, it immediately cuts off the current output to prevent potential damage. However, if for some reason the protection control unit 21 fails to cut off the circuit in time and the current continues to abnormally rise to a dangerous level, the fusing unit 23, as the last line of defense, automatically fuses to physically cut off the current path, ensuring the safety of the device and personnel. The organic combination of these three protection measures not only meets the high-standard requirements of the ia protection level, but also provides a strong guarantee for the safe operation of the device in a high-risk environment, significantly improving the reliability of the intrinsically safe mining device and the operation safety of miners, ensuring the safety of miners under extreme working conditions.

[0041] In one embodiment, the input unit 1 is connected to the positive electrode B+ and the negative electrode B- of the battery, and can be directly welded to both ends of the battery positive and negative electrodes. The output unit 3 is used as the external output terminal of the ia protection board, and generally can be directly welded to the protection board with red and black wires.

[0042] In some embodiments, the protection control unit 21 includes a detection unit 211 and a control unit 212. The control unit 212 is connected to the current limiting unit 22, the current limiting unit 22 is connected to the fusing unit 23, and the fusing unit 23 is connected to the output unit 3. The detection unit 211 is configured to send a control signal to the control unit 212 when it detects that the output current is greater than the set value, so that the control unit 212 becomes an off state.

[0043] With the above design, the control unit 212, the current limiting unit 22, and the fusing unit 23 are connected in sequence, forming the core protection mechanism of the battery ia protection board, ensuring rapid and effective response under different levels of current abnormalities. First, the current limiting unit 22 acts as the first line of defense to physically limit the current, ensuring that the current flows within a safe range and reducing the risk of current abnormalities. The control unit 212 acts as the second line of defense. By real-time monitoring the current status and reacting promptly, it can quickly cut off the abnormal current and prevent overload situations. Finally, the fusing unit 23 serves as the ultimate safety guarantee. When the current abnormally rises to a dangerous level, it can automatically fuse, physically cutting off the current path and preventing possible safety accidents, ensuring the safety of equipment and personnel. This sequential connection design not only improves the system's safety but also enhances the control ability of current abnormalities through multiple layers of protection, ensuring the stable and safe operation of intrinsically safe mining equipment in high-risk environments.

[0044] In some embodiments, the detection unit 211 includes multiple current detection chips, and the current detection chips are connected in parallel with each other.

[0045] In this embodiment, by integrating multiple current detection chips in the detection unit 211 and making them work in parallel, the accuracy and reliability of current detection are further improved. The parallel current detection chips can distribute the detection tasks, reduce the burden on a single chip, and reduce the failure rate. At the same time, this design also improves the redundancy of the system. Even if a certain chip fails, other chips can still continue to work, ensuring the continuity and stability of current detection. In addition, the parallel use of multiple detection chips can also improve the detection speed and accuracy, providing more accurate current information for the control unit 212, thereby achieving more precise current control.

[0046] Specifically, the detection unit 211 may include current detection chips U3 and U5. In this embodiment, the current detection chips U3 and U5 may be battery protection chips of model S-8261DBU-I6T1U.

[0047] Generally, the faster the battery output protection time is, the better. However, being too fast will also affect the load startup. Therefore, a moderate short-circuit protection time can be selected, such as 200 - 300 μs. In this embodiment, the acquisition protection voltage of the current detection chip is 0.08 V, the discharge overcurrent protection time is 16 ms, and the short-circuit protection time is 280 μs.

[0048] In some embodiments, the control unit 212 includes multiple field effect transistors, and the field effect transistors are connected in parallel with each other.

[0049] By integrating multiple field effect transistors in the control unit 212 and making them work in parallel, the current control ability is enhanced. The field effect transistor, as an efficient electronic switch, can quickly respond to control signals and achieve precise control of the current. The parallel field effect transistors can share the current load, improve the load-bearing capacity of the system, reduce the thermal loss of a single transistor, and extend the service life. At the same time, this design also improves the redundancy of the system. Even if a certain field effect transistor fails, the other transistors can still continue to work, ensuring the continuity and stability of current control. In addition, the parallel use of multiple field effect transistors can also improve the response speed of the system, achieve faster current switching, and thus better protect the safety of equipment and personnel.

[0050] Specifically, the control unit 212 may include field effect transistors U4 and U6. In this embodiment, the field effect transistors U4 and U6 can be semiconductor devices with the model number VBZC8205B.

[0051] In some embodiments, the battery ia protection board further includes a voltage stabilizing unit, and the voltage stabilizing unit is respectively connected to the input unit 1, the detection unit 211, and the control unit 212.

[0052] In this way, by introducing the voltage stabilizing unit, it is ensured that the entire protection board works under a stable voltage. The voltage stabilizing unit is connected to the input unit 1, the detection unit 211, and the control unit 212 to provide a stable voltage supply for them. This design can reduce the impact of voltage fluctuations on the system performance, improve the stability and reliability of the system. Especially in high-risk environments such as coal mines, the voltage stability is crucial for protecting the safety of equipment and personnel. The use of the voltage stabilizing unit can also reduce the current abnormality caused by voltage fluctuations, reduce the risk of equipment damage, and improve the reliability of intrinsically safe mine equipment.

[0053] In some embodiments, the voltage stabilizing unit includes voltage stabilizing capacitors C2 and C3. Taking the voltage stabilizing capacitor C3, the current detection chip U5, and the field effect transistor U6 as examples for illustration. Among them, the capacitance values of the voltage stabilizing capacitors C2 and C3 can be selected as 1 μF.

[0054] Specifically, the first end of the voltage-stabilizing capacitor C3 is respectively connected to the VDD pin of the current detection chip U5 of the detection unit 211 and the positive electrode of the input unit 1, and the second end of the voltage-stabilizing capacitor is respectively connected to the VSS pin of the current detection chip U5, the negative electrode of the input unit 1, and the field-effect transistor U6 of the control unit 212.

[0055] Both ends of the voltage-stabilizing capacitor C3 are respectively connected to the current detection chip U5 of the detection unit 211, the positive and negative electrodes of the input unit 1, and the field-effect transistor U6, ensuring the voltage supply of these key components. This design can reduce the impact of voltage fluctuations on current detection and control, and improve the stability of the system. Especially during the current detection and control process, the stability of the voltage is crucial for achieving precise current control. In addition, the use of the voltage-stabilizing capacitor C3 can also reduce electromagnetic interference caused by voltage fluctuations, improve the anti-interference ability of the system, and ensure the stable operation of the intrinsically safe mining equipment in a complex environment.

[0056] For the connection method and technical effects of the voltage-stabilizing capacitor C2, the current detection chip U3, and the field-effect transistor U4, refer to the above embodiments and will not be elaborated here.

[0057] In some embodiments, the gate of the field-effect transistor of the control unit 212 is connected to the control signal output end of the current detection chip, and the source is respectively connected to the current-limiting unit 22 and the second end of the voltage-stabilizing capacitor.

[0058] In this embodiment, by connecting the gate of the field-effect transistor of the control unit 212 to the control signal output end of the detection unit 211, precise control of the current is achieved. This design enables the field-effect transistor to quickly respond according to the control signal of the detection unit 211 and achieve precise switching of the current. The source is connected to the current-limiting unit 22 and the second end of the voltage-stabilizing capacitor, ensuring the stable output of the current. This design not only improves the response speed of the system but also enhances the control ability for abnormal current conditions, effectively preventing equipment damage or safety accidents caused by excessive current. In addition, this design can also reduce electromagnetic interference during the current switching process and improve the stability and reliability of the system.

[0059] Specifically, the field-effect transistor adopts a dual-source design, with its first source S1 connected to the current-limiting unit 22 and the second source S2 connected to the second end of the voltage-stabilizing capacitor.

[0060] In some embodiments, the control signal output end includes a data signal output end DOUT and a clock signal output end COUT, and the gate of the field-effect transistor includes a first gate G1 and a second gate G2. The first gate G1 is connected to the clock signal output end COUT, and the second gate is connected to the data signal output end DOUT.

[0061] In this embodiment, by introducing the data signal output terminal DOUT, the clock signal output terminal COUT, and the dual-gate design of the field-effect transistor, a more complex control logic is achieved. The introduction of the data signal output terminal DOUT and the clock signal output terminal COUT enables the control unit 212 to achieve more refined current control according to different signal combinations. The dual-gate design allows the field-effect transistor to perform switching operations according to the combination of the clock signal and the data signal, improving the flexibility and accuracy of control. This design can adjust the current output according to different requirements to achieve more optimized power management. In addition, this design can also reduce the electromagnetic interference during the current switching process, improving the stability and reliability of the system.

[0062] Among them, the data signal and the clock signal are the key signals in the control unit 212 for precisely controlling the current output. The data signal is responsible for transmitting specific current control instructions, such as turning on or off the current output, or adjusting the magnitude of the current to adapt to different working states and requirements. The clock signal provides a synchronous timing reference for the data signal, ensuring that the data signal is processed and executed at the correct moment. Through the coordinated operation of the data signal and the clock signal, the control unit 212 can achieve precise control of the current, including quickly responding to current anomalies, adjusting the output current in real time to meet the device operation requirements, and quickly cutting off the power output when necessary to protect the device and personnel safety. This design improves the flexibility and accuracy of current control, while ensuring the stability and reliability of the system. Especially in high-risk environments such as coal mines, this precise current control is crucial for ensuring the safe operation of the device.

[0063] In some embodiments, the battery ia protection board further includes a sampling resistor. One end of the sampling resistor is connected to the detection unit 211 and the output unit 3, and the other end is connected to the control unit 212.

[0064] By introducing the sampling resistor, the accuracy of current detection is further improved. One end of the sampling resistor is connected to the detection unit 211 and the output unit 3, and the other end is connected to the control unit 212, enabling the detection unit 211 to monitor the magnitude of the current according to the voltage drop across the sampling resistor. This design can reduce the error in the current detection process and improve the accuracy of current detection. The use of the sampling resistor can also provide more accurate current information for the control unit 212, enabling the control unit 212 to perform more precise control according to the real-time current state. In addition, the use of the sampling resistor can also reduce the electromagnetic interference during the current detection process, improving the stability and reliability of the system.

[0065] Specifically, the sampling resistor includes resistor R1 and resistor R9. The overcurrent protection detection voltage is 0.08V, and resistors R1 and R9 can directly use 0.08Ω resistors. Resistors R4 and R7 are respectively connected to current detection chips U3 and U5, and the resistance values of resistors R4 and R7 are 2kΩ.

[0066] In some embodiments, the current limiting unit 22 includes a plurality of serially connected current limiting resistors.

[0067] Using a plurality of serially connected current limiting resistors in the current limiting unit 22 realizes effective current limitation. These current limiting resistors work together to form a resistor network, which can evenly distribute the current and prevent equipment damage or safety accidents caused by excessive current. This design not only improves the load-bearing capacity of the system, but also reduces the heat loss of a single resistor and extends the service life of the resistor. At the same time, this design can also improve the redundancy of the system. Even if a certain resistor fails, other resistors can still continue to work to ensure the continuity and stability of current limitation. In addition, the use of multiple serially connected resistors can also improve the anti-interference ability of the system and ensure the stable operation of the intrinsically safe mine equipment in a complex environment.

[0068] Specifically, the current limiting resistors include serially connected resistors R11, R10, and R6. The resistance values of these three resistors are all 0.2Ω, the resistor power is all 1W, and the error is 1%.

[0069] The specification of the fusing unit 23 is 1A. According to the standard requirement (1A×1.7)²×0.2Ω×(1 + 1%) = 0.584W, and 1.5 times of it is: 0.584W×1.5 = 0.875W < 1W. Therefore, the resistor of the fusing unit 23 in this embodiment is a reliable device.

[0070] In the protection circuit of this embodiment, resistors R3 and R5 are respectively connected between the voltage stabilizing capacitors C2 and C3 and the positive electrode B+. The resistance values of resistors R3 and R5 are 330Ω. A resistor R8 with a resistance value of 1MΩ is also connected between the second end of the voltage stabilizing capacitor C3 and the negative electrode B-.

[0071] This embodiment proposes a battery ia protection board for a portable intrinsically safe mine equipment, aiming to meet the strict requirements for equipment safety in high-risk environments. The design of this protection board adopts a multi-level and multi-unit protection mechanism, ensuring a rapid and effective response under various abnormal current conditions, thereby significantly improving the reliability of mine equipment and the operation safety of miners.

[0072] First, the protection board consists of an input unit 1, an output unit 3, and a protection circuit 2. The input unit 1 is responsible for connecting to the battery, and the output unit 3 provides a stable power output to the intrinsically safe mining equipment. The protection circuit 2 includes a protection control unit 21, a current limiting unit 22, and a fusing unit 23, which are connected in sequence to form a rigorous current monitoring and control system. The protection control unit 21 is composed of a detection unit 211 and a control unit 212. The detection unit 211 monitors the output current in real time through multiple parallel current detection chips. Once the detected current exceeds the set safety threshold, it immediately sends a control signal to the control unit 212, triggering the control unit to switch to the cut-off state and cut off the power output.

[0073] The control unit 212 is composed of multiple parallel field effect transistors. These field effect transistors respond quickly according to the signal of the detection unit 211 to achieve precise control of the current. In addition, the protection board also includes a voltage stabilizing unit, which is connected to the input unit, the detection unit, and the control unit to ensure that the entire system operates under a stable voltage, improving the stability and reliability of the system.

[0074] Furthermore, voltage stabilizing capacitors are used in the voltage stabilizing unit to ensure the voltage supply of key components and reduce the impact of voltage fluctuations on current detection and control. The gates of the field effect transistors in the control unit 212 are connected to the control signal output terminals of the detection unit, achieving precise control of the current. The control signal output terminals include a data signal output terminal and a clock signal output terminal, which are connected to the gates of the field effect transistors to provide a synchronous timing reference and ensure the accurate execution of the control signal.

[0075] In addition, the protection board also introduces a sampling resistor to further improve the accuracy of current detection. One end of the sampling resistor is connected to the detection unit and the output unit, and the other end is connected to the control unit, enabling the detection unit to monitor the magnitude of the current based on the voltage drop across the sampling resistor and providing more accurate current information to the control unit.

[0076] The current limiting unit consists of multiple series-connected current limiting resistors to physically limit the current and ensure that the current flows within a safe range. Finally, as the last safety guarantee, the fusing unit can automatically fuse when the current abnormally rises to a dangerous level, physically cutting off the current path to prevent possible safety accidents.

[0077] In summary, the battery ia protection board of this embodiment realizes rigorous monitoring and control of the battery output current through a multi-level and multi-unit protection mechanism. This design not only meets the high standards of the ia protection level, but also significantly improves the safety and reliability of intrinsically safe mining equipment in high-risk environments through precise current control and rapid abnormal response, providing a safer working environment for miners.

[0078] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A battery ia protection board for portable mining intrinsically safe equipment, characterized in that: It includes an input unit, a protection circuit and an output unit, wherein the input unit is connected to a battery, and the output unit is connected to the input unit, and is used to output power to a mining intrinsically safe device; The protection circuit includes a protection control unit, a current limiting unit and a fuse unit connected in series between the input unit and the output unit. The protection control unit is used to cut off the power output of the output unit when it is detected that the output current of the protection circuit is greater than a set value. The current limiting unit is used to limit the magnitude of the output current. The fuse unit is used to change to a fuse state when the output current exceeds the set value.

2. The battery ia protection plate according to claim 1, characterized in that: The protection control unit includes a detection unit and a control unit, the control unit is connected to the current limiting unit, the current limiting unit is connected to the fuse unit, the fuse unit is connected to the output unit, and the detection unit is used to send a control signal to the control unit when it detects that the output current is greater than the set value, so that the control unit becomes a cut-off state.

3. The battery ia protection plate according to claim 2, characterized in that: The detection unit includes a plurality of current detection chips, and the current detection chips are connected in parallel.

4. The battery ia protection plate according to claim 2, characterized in that: The control unit includes a plurality of field effect transistors, and the field effect transistors are connected in parallel.

5. The battery ia protection plate according to any one of claims 2 to 4, characterized in that: It also includes a voltage stabilizing unit, which is connected to the input unit, the detection unit and the control unit respectively.

6. The battery ia protection plate according to claim 5, characterized in that: The voltage stabilizing unit includes a voltage stabilizing capacitor, a first end of the voltage stabilizing capacitor is respectively connected to the VDD pin of the current detection chip of the detection unit and the positive electrode of the input unit, and a second end of the voltage stabilizing capacitor is respectively connected to the VSS pin of the current detection chip, the negative electrode of the input unit and the control unit.

7. The battery ia protection plate according to claim 6, characterized in that: The gate of the field effect tube of the control unit is connected to the control signal output end of the current detection chip, and the source is connected to the current limiting unit and the second end of the voltage stabilizing capacitor respectively.

8. The battery ia protection plate according to claim 7, characterized in that: The control signal output terminal includes a data signal output terminal and a clock signal output terminal, and the gate of the field effect tube includes a first gate and a second gate, the first gate is connected to the clock signal output terminal, and the second gate is connected to the data signal output terminal.

9. The battery ia protection plate according to claim 2, characterized in that: It also includes a sampling resistor, one end of which is connected to the detection unit and the output unit, and the other end of which is connected to the control unit.

10. The battery ia protection plate according to claim 1, characterized in that: The current limiting unit includes a plurality of current limiting resistors connected in series.

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