Method and circuit for accelerating suppression of transient energy of mining intrinsic safety battery

Abstract

The invention relates to a method and a circuit for accelerating suppression of transient energy of a mining intrinsic safety battery, and belongs to the field of mining intrinsic safety equipment. The circuit comprises at least two stages of cascaded protection modules, and each stage of protection module has the same circuit structure. Wherein the protection module comprises a current acquisition and comparison chip, a comparator, MOS (Metal Oxide Semiconductor) transistors Q1 and Q2, a voltage stabilizing diode and a resistor component. A protection circuit formed by at least two cascaded protection modules is arranged between an intrinsic safety type battery and mining equipment; and the output voltage and the output current of the intrinsic safety type battery are monitored in real time through the protection circuit. And if the output voltage or the output current is monitored to be abnormal, the connection between the intrinsic safety type battery and the mining equipment is quickly disconnected through the protection circuit, so that the instantaneous energy of the mining equipment is prevented from exceeding a dangerous value. The comparator can quickly act within about 15 microseconds to disconnect the mos tube, and the transient energy is controlled within 20 microseconds, which completely conforms to the specification.

Description

Technical Field

[0001] The invention belongs to the field of intrinsically safe equipment for mining, relates to mining batteries, and in particular to a method and a circuit for accelerating the suppression of transient energy of intrinsically safe batteries for mining. Background Art

[0002] As a key component of the mine monitoring system and personnel positioning system, the mine intrinsically safe battery undertakes the important task of providing backup power supply for these devices. In explosive environments such as coal mines, the safety of equipment is of vital importance, so the design and manufacture of mine intrinsically safe batteries must strictly comply with relevant safety standards and regulations.

[0003] GB3836.4-2021 "Explosive atmospheres Part 4: Equipment protected by intrinsic safety type "i"" is an important standard for regulating intrinsic safety equipment for mining. Among them, Article 10.1.5.3 clearly stipulates that the allowable passing energy of Class I equipment at the moment of a sharp short circuit should not exceed 260μJ. This regulation is to ensure that in abnormal conditions such as short circuits, the equipment will not generate enough energy to cause an explosion, thereby ensuring the safety of personnel and equipment.

[0004] As a Class I device, the short-circuit transient energy control of intrinsically safe batteries for mining is particularly important. However, traditional control methods mostly use control chips combined with MOS tubes to suppress transient energy. Although this method can work to a certain extent, it often has the problem of long control chip action time. Due to the long action time, the transient energy may exceed the specified 260μJ threshold, resulting in the failure of the explosion-proof type of the intrinsically safe battery, increasing the safety risk in explosive environments.

[0005] In addition, traditional control methods have shortcomings such as slow response speed and insufficient stability. In complex mining environments, these shortcomings may cause equipment to fail to work properly at critical moments, affect the accuracy of monitoring and positioning, and even endanger personnel safety. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a method and circuit for accelerating the suppression of transient energy of intrinsically safe batteries for mining, which can achieve the effect of suppressing transient energy by significantly shortening the shutdown action time, thereby ensuring the effectiveness of the explosion-proof type of the intrinsically safe battery.

[0007] To achieve the above objectives, the present invention provides a circuit for accelerating the suppression of transient energy of an intrinsically safe battery for mining. The circuit includes at least two cascaded protection modules, and each protection module has the same circuit structure.

[0008] The protection module includes a current acquisition comparison chip, a comparator, MOS tubes Q1 and Q2, a voltage stabilizing diode and first to eighth resistors.

[0009] The VDD pin of the current acquisition comparison chip is connected to the positive electrode of the intrinsically safe battery through the first resistor, the OUTA pin and the OUTB pin are connected to the gates of the MOS tubes Q2 and Q1 respectively, and the INA pin is connected to the source of the MOS tube Q1 through the third resistor. The negative electrode of the voltage regulator diode is connected to the positive electrode of the intrinsically safe battery through the eighth resistor, and the positive electrode of the voltage regulator diode is connected to the negative electrode of the intrinsically safe battery; the second resistor and the fourth resistor are connected in series and bridged between the voltage regulator diode and the negative electrode of the intrinsically safe battery for voltage division. The positive input terminal of the comparator is connected to the positive electrode of the intrinsically safe battery through the sixth resistor, and the positive input terminal is also connected to the connection point of the second resistor and the fourth resistor; the reverse input terminal of the comparator is connected to the source of the MOS tube Q2 through the fifth resistor, and the reverse input terminal is also connected to the negative electrode of the intrinsically safe battery; the output terminal of the comparator is connected to the gate of the MOS tube Q2 through the seventh resistor.

[0010] On the other hand, the present invention proposes a method for accelerating the suppression of transient energy in an intrinsically safe battery for mining, wherein a protection circuit composed of at least two cascaded protection modules is arranged between the intrinsically safe battery and mining equipment; and the output voltage and output current of the intrinsically safe battery are monitored in real time through the protection circuit.

[0011] If the output voltage or output current is abnormal, the protection circuit will quickly disconnect the connection between the intrinsically safe battery and the mining equipment to prevent the instantaneous energy of the mining equipment from exceeding the dangerous value, that is, 260μJ specified in GB3836.4-2021.

[0012] The beneficial effects of the present invention are as follows: the present invention adopts a multi-level protection module, and the circuit structure of each level of protection module is the same, which meets the requirements of ib intrinsically safe equipment. When the current exceeds the preset threshold, the comparator can quickly act in about 15μs to disconnect the MOS tube and control the transient energy within 20μJ, which fully complies with the provisions of GB3836.4.

[0013] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0015] Figure 1 A schematic diagram of a two-stage cascade protection circuit structure provided by an embodiment of the present invention;

[0016] Figure 2 This is the instantaneous energy waveform diagram generated when the protection circuit is composed of a battery protection chip and a MOS tube.

[0017] Figure 3 The instantaneous energy waveform diagram generated when the protection circuit described in the embodiment of the present invention is used. DETAILED DESCRIPTION

[0018] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0019] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0020] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0021] An embodiment of the present invention provides a protection circuit for accelerating the suppression of transient energy of an intrinsically safe battery for mining, the circuit being composed of two-stage cascaded protection modules, such as Figure 1 As shown, the two cascade protection modules of the protection circuit have the same circuit structure. The protection circuit monitors the output voltage and output current of the intrinsically safe battery in real time. When the output current or voltage of the intrinsically safe battery is detected to be abnormal, the connection between the intrinsically safe battery and the mining equipment is quickly disconnected, thereby preventing the mining equipment from passing energy exceeding 260μJ in an instant under abnormal conditions such as short circuit.

[0022] Specifically, in the two-stage cascade protection circuit, each stage of the protection module includes components such as a current acquisition comparison chip, a comparator, a MOS tube, a resistor, a diode, and a voltage regulator. Figure 1 As shown, this embodiment describes the first-level protection module in detail:

[0023] The VDD terminal of the current acquisition comparison chip U1 is connected to the positive electrode of the intrinsically safe battery through the resistor R1. In addition, a capacitor C1 is connected between the VDD terminal and the negative electrode of the battery; the OUTA terminal and OUTB terminal of the chip U1 are connected to the gates of the MOS tubes Q2 and Q1 respectively; the INA terminal of the chip U1 is connected to the source of the MOS tube Q1 through the resistor R3; and the GND terminal of the chip U1 is connected to the negative electrode of the battery. The reverse input terminal of the comparator U2 is connected to the negative electrode of the battery, and its reverse input terminal is also connected to the source of the MOS tube Q2 through the resistor R5; the positive input terminal of the comparator U2 is connected to the positive electrode of the battery through the resistor R6, and at the same time, its positive input terminal is connected to the reference voltage provided by the voltage regulator U3; the output terminal of the comparator U2 is connected to the gate of the MOS tube Q2 through the resistor R7, and a diode D1 is also connected across the two ends of the resistor R7, and the negative electrode of D1 is connected to the output terminal of U2. The negative electrode of the voltage regulator U3 is connected to the positive electrode of the battery through the resistor R15, and the positive electrode is connected to the negative electrode of the battery. On the negative electrode side of the voltage regulator U3, the resistor R2 and the resistor R4 are connected to the negative electrode of the battery.

[0024] The working principle of the protection circuit is as follows: In normal operation, the intrinsically safe battery discharges externally, and the current acquisition comparison chip U1 detects that the voltage and current of the intrinsically safe battery are within the normal range. The OUTA and OUTB pins respectively output high levels to turn on the MOS tubes Q1 and Q2. The current flows through the internal resistance of the MOS tube and the current limiting resistor R5 to generate a voltage drop. The INA pin of the protection chip is connected to the source of the MOS tube Q1, and the voltage drop at this point is detected and compared with the built-in reference voltage; at the same time, the voltage regulator U3 provides a stable voltage, which is divided by R2 and R4 to form the same reference voltage as the protection chip and connected to the positive input of the comparator U2. The source of the MOS tube Q2 is connected to the reverse input of the comparator. When a short circuit occurs, the current becomes large and the voltage drop of the INA pin exceeds the reference voltage. The chip U1OUTA pin outputs a low level, the voltage of the reverse input terminal of the comparator is greater than the voltage of the positive input terminal, the comparator outputs a low level, and the comparator acts faster, turning off the MOS tube Q2, achieving the purpose of limiting transient energy.

[0025] In this way, through the two-stage cascade protection circuit, it can be ensured that when any level of protection module fails, it can still guarantee timely response to abnormal situations such as short circuits. In order to further improve the safety of mining equipment, multiple protection modules can be cascaded to further improve the intrinsic safety protection of mining equipment and intrinsically safe batteries.

[0026] In another embodiment of the present invention, two protection circuit combinations are provided for comparison, wherein combination 1 is a battery protection chip plus a MOS tube, and combination 2 is a protection circuit proposed in an embodiment of the present invention. The transient energy waveforms of the two combinations are measured respectively.

[0027] like Figure 2 As shown, it is the transient energy waveform of the combined protection circuit. Figure 2 In the figure, the yellow line is the voltage waveform, the blue line is the current waveform, and the pink line is the transient energy waveform. During the test, the input end of the battery protection circuit is connected to the battery, and the output end is led out by a wire and directly short-circuited to simulate the short circuit of the mobile phone. Figure 2 It can be seen that when a short circuit occurs, the action time from the MOS tube being actuated to being completely shut down is 290μs, and the transient energy reaches 645μJ, which is greater than 260μJ and does not meet the relevant provisions of GB3836.4.

[0028] Figure 3 The figure shows the transient energy waveform of the combination two protection circuit. Figure 3 In the figure, the yellow line is the voltage waveform, the blue line is the current waveform, and the pink line is the transient energy waveform. It can be seen that when a short circuit occurs, the action time from the MOS tube to complete shutdown is only 14.5μs, and the transient energy is only 15μJ, which fully complies with the relevant provisions of GB3836.4.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A circuit for accelerating the suppression of transient energy of an intrinsically safe battery for mining, the circuit being connected between the intrinsically safe battery and mining equipment and used for real-time monitoring of the output current and output voltage of the intrinsically safe battery, characterized in that: The circuit comprises at least two levels of cascaded protection modules, and each level of protection modules has the same circuit structure.

2. The circuit according to claim 1, characterized in that The protection module includes a current acquisition comparison chip, a comparator, MOS tubes Q1 and Q2, a voltage regulator diode and first to eighth resistors; the VDD pin of the current acquisition comparison chip is connected to the positive electrode of the intrinsically safe battery through the first resistor, the OUTA pin and the OUTB pin are respectively connected to the gates of the MOS tubes Q2 and Q1, and the INA pin is connected to the source of the MOS tube Q1 through the third resistor; the negative electrode of the voltage regulator diode is connected to the positive electrode of the intrinsically safe battery through the eighth resistor, and the positive electrode of the voltage regulator diode is connected to the negative electrode of the intrinsically safe battery; the second resistor and the fourth resistor are connected in series and bridged between the voltage regulator diode and the negative electrode of the intrinsically safe battery for voltage division; the positive input terminal of the comparator is connected to the positive electrode of the intrinsically safe battery through the sixth resistor, and the positive input terminal is also connected to the connection point of the second resistor and the fourth resistor; the reverse input terminal of the comparator is connected to the source of the MOS tube Q2 through the fifth resistor, and the reverse input terminal is also connected to the negative electrode of the intrinsically safe battery; the output terminal of the comparator is connected to the gate of the MOS tube Q2 through the seventh resistor.

3. A method for accelerating the suppression of transient energy in an intrinsically safe battery for mining, characterized in that: The method comprises: providing a protection circuit composed of at least two cascaded protection modules between an intrinsically safe battery and mining equipment; The output voltage and output current of the intrinsically safe battery are monitored in real time by the protection circuit; If the output voltage or output current is detected to be abnormal, the protection circuit quickly disconnects the connection between the intrinsically safe battery and the mining equipment to prevent the instantaneous energy of the mining equipment from exceeding a dangerous value.

4. The method according to claim 3, characterized in that In the protection circuit, each level of protection module has the same circuit structure.

5. The method according to claim 4, characterized in that The protection module includes a current acquisition comparison chip, a comparator, MOS tubes Q1 and Q2, a voltage regulator diode and first to eighth resistors; the VDD pin of the current acquisition comparison chip is connected to the positive electrode of the intrinsically safe battery through the first resistor, the OUTA pin and the OUTB pin are respectively connected to the gates of the MOS tubes Q2 and Q1, and the INA pin is connected to the source of the MOS tube Q1 through the third resistor; the negative electrode of the voltage regulator diode is connected to the positive electrode of the intrinsically safe battery through the eighth resistor, and the positive electrode of the voltage regulator diode is connected to the negative electrode of the intrinsically safe battery; the second resistor and the fourth resistor are connected in series and bridged between the voltage regulator diode and the negative electrode of the intrinsically safe battery for voltage division; the positive input terminal of the comparator is connected to the positive electrode of the intrinsically safe battery through the sixth resistor, and the positive input terminal is also connected to the connection point of the second resistor and the fourth resistor; the reverse input terminal of the comparator is connected to the source of the MOS tube Q2 through the fifth resistor, and the reverse input terminal is also connected to the negative electrode of the intrinsically safe battery; the output terminal of the comparator is connected to the gate of the MOS tube Q2 through the seventh resistor.

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