A core pressure relief burst valve controller unlocking device and threshold comparison module thereof

Abstract

The present invention discloses a core pressure relief burst valve controller unlocking device and a threshold comparison module thereof. The present invention belongs to the field of digital instrumentation and control technology for nuclear reactor protection. The threshold comparison module comprises: a comparison unit, wherein the three input ends of the comparison unit are respectively connected to the threshold output by the threshold setting unit, the analog signal output by the signal sampling unit, and the hysteresis value output by the hysteresis setting unit, and the input threshold, analog signal, and hysteresis value are logically processed to generate a threshold trigger signal and a hysteresis trigger signal; a trigger unit, wherein the trigger unit logically processes the threshold trigger signal and the hysteresis trigger signal to generate an unlocking trigger signal or an unlocking non-trigger signal; the setting of the threshold and the hysteresis value are independent of each other, and the threshold generated by the threshold setting unit is less than the hysteresis value generated by the hysteresis setting unit. The threshold comparison module proposed by the present invention adopts the threshold setting unit and the hysteresis setting unit to independently set and adjust the threshold and the hysteresis value, so that the two do not affect each other, the setting is convenient, and the operability is strong.

Description

Technical Field

[0001] The invention belongs to the technical field of digital instrumentation and control for nuclear reactor protection, and in particular relates to a core pressure relief bursting valve controller unlocking device and a threshold comparison module thereof. Background Art

[0002] As a key passive equipment of the nuclear reactor protection system, the burst valve ensures the reliable operation of the passive core cooling system during an accident by reducing the pressure inside the reactor under accident conditions, thereby reducing the radiation exposure to equipment and personnel. The burst valve controller performs burst valve ignition operations according to system instructions. There is a situation where the software system mistakenly sends instructions or is affected by a fault and mistakenly ignites the burst valve. Such situations can be effectively avoided by adding a locking device in front of the burst valve controller. When the reactor is working normally, the burst valve controller is in a locked state, the ignition signal fails, and the burst valve cannot ignite; under accident conditions, it enters an unlocked state, and the burst valve controller can normally output the burst valve ignition signal. The signal that triggers the burst valve controller to enter the unlocked state contains a 0-20mA analog signal. When the analog signal exceeds the set threshold, the locking device will be triggered to output an unlocking signal. When the analog signal reaches the analog signal corresponding to the hysteresis, the output is converted to a non-trigger signal, where the threshold and hysteresis can be adjusted according to the on-site conditions.

[0003] Therefore, the threshold comparison of the burst valve controller locking device needs to have high reliability, high stability, high precision and operability. Usually, the general practice of threshold comparison is to use an operational amplifier and a resistor to form a hysteresis comparison circuit. When using this method to set the threshold and hysteresis, there are the following disadvantages:

[0004] (1) The hysteresis is bilaterally adjusted. When the threshold is adjusted, the hysteresis value changes accordingly.

[0005] (2) The long-term stability is poor. When the threshold drifts, the hysteresis is superimposed on this drift;

[0006] (3) The threshold and hysteresis adjustments are coupled with each other, making them difficult to adjust and calibrate separately, resulting in poor operability. Summary of the invention

[0007] In order to solve the problems existing in the existing threshold comparison technology, such as the mutual coupling and mutual influence of the threshold and hysteresis adjustment, difficulty in adjusting and calibrating separately, and poor operability, the present invention proposes a core pressure relief burst valve controller unlocking device and a threshold comparison module thereof. The threshold comparison module proposed in the present invention independently sets and adjusts the threshold and hysteresis value, so that the threshold and hysteresis value do not affect each other and the operability is strong.

[0008] The present invention is achieved through the following technical solutions:

[0009] A core pressure relief burst valve controller unlocking device threshold comparison module, the threshold comparison module comprising:

[0010] A comparison unit, wherein three input terminals of the comparison unit are respectively connected to the threshold value output by the threshold setting unit, the analog signal output by the signal sampling unit, and the hysteresis value output by the hysteresis setting unit, and the comparison unit performs logic processing on the input threshold value, analog signal, and hysteresis value to generate a threshold trigger signal and a hysteresis trigger signal;

[0011] and a trigger unit, which performs logic processing on the threshold trigger signal and the hysteresis trigger signal to generate an unlock trigger signal or an unlock non-trigger signal;

[0012] The threshold setting unit and the hysteresis setting unit obtain the threshold and the hysteresis value based on the same reference source, the settings of the threshold and the hysteresis value are independent of each other, and the threshold generated by the threshold setting unit is smaller than the hysteresis value generated by the hysteresis setting unit.

[0013] The technology of threshold comparison is usually realized by using an operational amplifier and a resistor to form a hysteresis comparison circuit in the unlocking device of the bursting valve controller. The threshold and hysteresis adjustment are coupled and affect each other, and are difficult to set and adjust separately, resulting in problems such as poor operability or poor stability. The threshold comparison module proposed in the present invention uses a threshold setting unit and a hysteresis setting unit to independently set and adjust the threshold and hysteresis value, so that the two do not affect each other, are easy to set, and have strong operability.

[0014] As a preferred embodiment, the signal sampling unit of the present invention is used to convert the current analog signal into a voltage signal.

[0015] As a preferred embodiment, the signal sampling unit of the present invention includes a precision resistor and an instrument operational amplifier;

[0016] The maximum common-mode rejection ratio and the lowest linearity error are obtained by setting the amplification factor of the instrument operational amplifier.

[0017] As a preferred embodiment, the processing logic of the comparison unit of the present invention is:

[0018] When the analog signal output by the signal sampling unit is less than the threshold value output by the threshold setting unit, the threshold trigger signal output by the comparison unit is a high level, otherwise the threshold trigger signal output by the comparison unit is a low level;

[0019] When the analog signal output by the signal sampling unit is smaller than the hysteresis value output by the hysteresis setting unit, the hysteresis trigger signal output by the comparison unit is at a high level, otherwise the hysteresis trigger signal output by the comparison unit is at a low level.

[0020] As a preferred embodiment, the processing logic of the trigger unit of the present invention is:

[0021] When the threshold trigger signal and the hysteresis trigger signal are both at low levels, the trigger unit outputs a low-level unlocking non-trigger signal;

[0022] When the threshold trigger signal and the hysteresis trigger signal are both at high levels, the trigger unit outputs a high-level unlock trigger signal; after the trigger unit outputs a high-level unlock trigger signal and before the hysteresis trigger signal becomes low level, the trigger unit keeps outputting a high-level unlock trigger signal;

[0023] When the hysteresis trigger signal becomes a low level, the trigger unit outputs a low level unlock non-trigger signal.

[0024] As a preferred embodiment, the threshold setting unit and the hysteresis setting unit of the present invention are both divided into fixed gear setting and continuous gear setting;

[0025] The fixed gear setting and the continuous gear setting are switched by a switching switch.

[0026] As a preferred embodiment, the fixed gear setting of the present invention uses a high-precision voltage divider network to divide the voltage of the reference source to obtain thresholds or hysteresis values ​​of different gears;

[0027] The fixed gear setting uses a rotary switch to switch between different thresholds or hysteresis values.

[0028] As a preferred embodiment, the switching of the threshold value and the hysteresis value of the present invention can be performed simultaneously.

[0029] As a preferred embodiment, the continuous gear setting of the present invention adopts a high-precision voltage regulating network to perform voltage division regulation on the reference source, and can continuously set any threshold value or hysteresis value within a set range.

[0030] On the other hand, the present invention also proposes a core pressure relief burst valve controller unlocking device, which includes the threshold comparison module described in the present invention, and the threshold comparison module is used to automatically trigger unlocking of the analog signal of the unlocking device, so that the unlocking device outputs an unlocking non-trigger signal under normal operating conditions; under abnormal operating conditions, when the analog signal is lower than the threshold, an unlocking trigger signal is output, and when the analog signal reaches the hysteresis value, an unlocking non-trigger signal is output.

[0031] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0032] 1. The threshold comparison module proposed in the present invention can realize the independent setting of the threshold value and the hysteresis value. The setting and adjustment of the threshold value and the hysteresis value do not affect each other, which is convenient for setting and has strong operability. When the threshold value drifts, the hysteresis will not overlap the drift, thereby improving stability.

[0033] 2. The processing logic adopted by the threshold comparison module proposed in the present invention can ensure that the signal is stably output within the hysteresis value near the threshold, avoiding the switching back and forth between the unlocking trigger signal and the non-trigger signal near the threshold, and further improving the stability;

[0034] 3. In the threshold comparison module proposed by the present invention, the threshold setting unit and the hysteresis setting unit adopt a voltage divider or voltage regulating network with low temperature drift, which can ensure long-term stability, and the threshold and hysteresis value are adjusted separately. Even if the threshold or hysteresis value has a slight temperature drift, they will not overlap and affect each other;

[0035] 4. The threshold comparison module proposed in the present invention has the advantages of high reliability, good stability, strong operability, etc., and can be well applied to the automatic triggering unlocking of the analog signal of the burst valve controller unlocking device of the reactor digital instrumentation and control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0037] Figure 1 4 is a principle block diagram of a threshold comparison module according to an embodiment of the present invention.

[0038] Figure 2 This is an example of the structure of the threshold comparison module according to an embodiment of the present invention.

[0039] Figure 3 This is a schematic diagram of a fixed gear threshold or hysteresis setting principle according to an embodiment of the present invention.

[0040] Figure 4 This is a schematic diagram of the continuous gear position threshold or hysteresis setting principle of an embodiment of the present invention.

[0041] Figure 5 A schematic diagram of input and output signals of an example of a threshold comparison module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0042] Hereinafter, the term "include" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. In addition, as used in various embodiments of the present invention, the terms "include", "have" and their cognates are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be understood as first excluding the presence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or the possibility of adding one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0043] In various embodiments of the present invention, the expression "or" or "at least one of A or / and B" includes any combination or all combinations of the words listed at the same time. For example, the expression "A or B" or "at least one of A or / and B" may include A, may include B, or may include both A and B.

[0044] The expressions (such as "first", "second", etc.) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only used for the purpose of distinguishing one element from other elements. For example, without departing from the scope of various embodiments of the present invention, the first element may be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0045] It should be noted that if it is described that one component element is “connected” to another component element, the first component element may be directly connected to the second component element, and a third component element may be “connected” between the first component element and the second component element. Conversely, when one component element is “directly connected” to another component element, it can be understood that there is no third component element between the first component element and the second component element.

[0046] The terms used in various embodiments of the present invention are only used for the purpose of describing specific embodiments and are not intended to limit various embodiments of the present invention. As used herein, the singular form is intended to also include the plural form, unless the context clearly indicates otherwise. Unless otherwise limited, all terms used here (including technical terms and scientific terms) have the same meaning as the meaning generally understood by those of ordinary skill in the art to which the various embodiments of the present invention belong. The terms (such as the terms defined in the dictionary generally used) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in various embodiments of the present invention.

[0047] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0048] Embodiment 1:

[0049] In the burst valve controller unlocking device, the existing method of using an operational amplifier and a resistor to form a hysteresis comparison circuit to realize threshold comparison has the problems that the threshold and hysteresis adjustment are coupled and affect each other, it is difficult to adjust them separately, and the long-term stability is poor or the operability is poor. In view of the above problems, this embodiment proposes a threshold comparison module for the core pressure relief burst valve controller unlocking device. The comparison module proposed in this embodiment can independently set and adjust the threshold and hysteresis value, so that the two do not affect each other, the setting is convenient, and the operability is strong.

[0050] like Figure 1 As shown, the comparison module proposed in this embodiment specifically includes:

[0051] a threshold setting unit, the threshold setting unit being used to generate a threshold and input it to the comparison unit;

[0052] A signal sampling unit, which is used to convert the analog signal and input it into the comparison unit;

[0053] A hysteresis setting unit, the hysteresis setting unit is used to generate a hysteresis value and input it to the comparison unit;

[0054] A comparison unit, which generates a threshold trigger signal and a hysteresis trigger signal according to a preset comparison logic and an input threshold value, an analog signal and a hysteresis value, and inputs the signals to the trigger unit;

[0055] and a trigger unit, which generates an unlock trigger signal or an unlock non-trigger signal according to a preset trigger logic and a threshold trigger signal and a hysteresis trigger signal output by the comparison unit;

[0056] The threshold value setting unit and the hysteresis setting unit obtain the threshold value and the hysteresis value by dividing the voltage of the same reference source, and the settings of the threshold value and the hysteresis value are independent of each other.

[0057] Furthermore, the signal sampling unit of this embodiment is used to convert the current analog signal of 0 to 20 mA into a voltage signal of 0 to 2 V (I / V conversion); the threshold and hysteresis value are set according to actual needs, and the threshold generated by the threshold setting unit must be smaller than the hysteresis value generated by the hysteresis setting unit.

[0058] Furthermore, the comparison unit includes three input terminals and two output terminals, and the output of the threshold setting unit, the output of the signal sampling unit and the output of the hysteresis setting unit are respectively used as input signals of the three input terminals of the comparison unit, and the first output terminal and the second output terminal of the comparison unit respectively output the threshold trigger signal and the hysteresis trigger signal; the comparison logic of the comparison unit is specifically as follows: when the output of the signal sampling unit is lower than the output of the threshold setting unit, the first output terminal of the comparison unit outputs a high level, otherwise (that is, the output of the signal sampling unit is higher than the output of the threshold setting unit), the first output terminal of the comparison unit outputs a low level; when the output of the signal sampling unit is lower than the output of the hysteresis setting unit, the second output terminal of the comparison unit outputs a high level, otherwise (that is, the output of the signal sampling unit is higher than the output of the hysteresis setting unit), the second output terminal of the comparison unit outputs a low level.

[0059] Furthermore, the trigger unit includes two input terminals and an output terminal, and the threshold trigger signal and the hysteresis trigger signal are respectively used as input signals of the first input terminal and the second input terminal of the trigger unit, and the output terminal of the trigger unit outputs the threshold comparison result, that is, the unlocking trigger signal or the unlocking non-trigger signal. The trigger logic of the trigger unit is specifically as follows: under normal working conditions, when both input terminals of the trigger unit input a low level, the output terminal outputs a low-level unlocking non-trigger signal; when both input terminals of the trigger unit input a high level, the output terminal outputs a high-level unlocking trigger signal; after the high-level unlocking trigger signal is output, and before the second input terminal of the trigger unit (that is, the output signal of the second output terminal corresponding to the comparison unit) is not input with a low level, the output terminal of the trigger unit maintains the output of the high-level unlocking trigger signal; when the second input terminal of the trigger unit inputs a low level (at this time, the first input terminal also inputs a low level), the output terminal of the trigger unit outputs a low-level unlocking non-trigger signal. That is, the signal input to the first input terminal of the trigger unit and the signal input to the second input terminal respectively control the rising edge and falling edge of the output signal of the output terminal.

[0060] Furthermore, the threshold setting unit and the hysteresis setting unit are both divided into fixed gear setting and continuous gear setting, and the fixed gear setting and the continuous gear setting can be switched with each other. Among them, the fixed gear setting can preset different thresholds or hysteresis values, and the switching of different thresholds or hysteresis values ​​can be carried out by means of, but not limited to, a rotary switch; the continuous gear setting can continuously adjust the threshold or hysteresis value within a large range.

[0061] The threshold comparison module proposed in this embodiment can realize independent setting of the threshold and the hysteresis. The setting and adjustment of the threshold and the hysteresis do not affect each other, the setting is convenient, and the operability is strong. At the same time, the threshold and the hysteresis value are adjusted separately. Even if the threshold or the hysteresis drifts, the drift of the threshold and the hysteresis will not affect each other, and it has higher stability.

[0062] The threshold comparison module proposed in this embodiment has the advantages of high reliability, good stability, strong operability, etc. It can be well applied to the automatic triggering of unlocking by the analog signal of the unlocking device of the burst valve controller of the reactor digital instrumentation and control system, so that the unlocking device outputs an unlocking non-triggering signal under normal working conditions; under abnormal working conditions, when the input analog signal is lower than the threshold, an unlocking triggering signal is output, and when the input analog signal reaches the hysteresis value, an unlocking non-triggering signal is output.

[0063] Embodiment 2:

[0064] The threshold comparison module proposed in the above embodiment 1 can be implemented in hardware, software or a combination of hardware and software. This embodiment describes the threshold comparison module proposed in the above embodiment 1 in detail in a hardware implementation manner.

[0065] like Figure 2 As shown, in this embodiment, the signal sampling unit is mainly composed of a precision resistor and an instrument operational amplifier, and the 0-20mA analog signal is converted into a voltage signal by the signal sampling unit. In this embodiment, the maximum common mode rejection ratio and the lowest linear error can be obtained by setting the amplification factor of the instrument operational amplifier to ensure the reliability of the signal.

[0066] In this embodiment, the three input terminals of the comparison unit (i.e., IN1, IN2, and IN3 of the comparison unit) are respectively connected to the output signal of the signal sampling unit, the output signal of the threshold setting unit, and the output signal of the hysteresis setting unit, and the two output terminals of the comparison unit (i.e., OUT1 and OUT2 of the comparison unit) respectively output the threshold trigger signal and the hysteresis trigger signal to the two input terminals of the trigger unit (i.e., IN1 and IN2 of the trigger unit). The comparison logic of the comparison unit is: when the output of the signal sampling unit is lower than the output of the threshold setting unit, OU1 of the comparison unit outputs a high level, otherwise, OUT1 of the comparison unit outputs a low level; when the output of the signal sampling unit is lower than the output of the hysteresis setting unit, OUT2 of the comparison unit outputs a high level, otherwise, OUT2 of the comparison unit outputs a low level.

[0067] In this embodiment, the two input ends of the trigger unit (i.e., IN1 and IN2 of the trigger unit) are connected to the threshold trigger signal and the hysteresis trigger signal respectively, and the output end of the trigger unit (i.e., OUT of the trigger unit) outputs the threshold comparison result, i.e., the unlock trigger signal or the unlock non-trigger signal. The trigger logic of the trigger unit is: under normal working conditions, both IN1 and IN2 of the trigger unit input low levels, and the OUT of the trigger unit outputs a low-level unlock non-trigger signal; under abnormal working conditions, when the IN1 of the trigger unit inputs a high level, the IN2 input is also high at this time, and the OUT of the trigger unit outputs a high-level unlock trigger signal; after the high-level unlock trigger signal is output, before the IN2 of the trigger unit inputs a low level, the OUT end of the trigger unit keeps outputting a high-level unlock trigger signal; when the IN2 of the trigger unit inputs a low level, the IN1 input is also low at this time, and the OUT end of the trigger unit outputs a low-level unlock non-trigger signal, i.e., the IN1 and IN2 of the trigger unit respectively control the rising edge and falling edge of the OUT output signal of the trigger unit. Specifically, the signal logic relationship between the comparison unit and the trigger unit of this embodiment is shown in Table 1 below.

[0068] Table 1 Logical relationship of threshold comparison module

[0069]

[0070] Furthermore, the threshold setting unit and the hysteresis setting unit in this embodiment are both divided into fixed gear and continuous gear setting, and the fixed gear and continuous gear can be switched by switching the switch. The fixed gear switching realizes the switching of thresholds or hysteresis values ​​of different gears by a multi-gear rotary switch. Specifically, the fixed gear can use a high-precision voltage divider network to divide the reference source voltage to obtain thresholds or hysteresis values ​​of different gears, and the threshold and hysteresis value can be switched at the same time by rotating the switch. The threshold or hysteresis value setting of the fixed gear is realized by the following principle: Figure 3 The continuous gear uses a high-precision voltage regulation network to divide the reference source and can continuously set any threshold or hysteresis within the set range. The threshold or hysteresis value setting of the continuous gear is implemented as follows: Figure 4 shown.

[0071] Whether you use a fixed or continuous gear to set the threshold and hysteresis value, both can be set separately, and the threshold and hysteresis value do not affect each other. Use a voltage divider or voltage regulator network with low temperature drift to ensure long-term stability, and the threshold and hysteresis value are adjusted separately. Even if the threshold or hysteresis value drifts slightly, they will not affect each other. When the fixed gear is selected, the threshold and hysteresis value are intuitive and clear. You can select them by simply switching the switch without adjustment and calibration; when the continuous gear is selected, the threshold and hysteresis can be adjusted independently. Set the threshold or hysteresis value first, and then set the other value.

[0072] This embodiment tests the above threshold comparison module, and the specific process is as follows:

[0073] Step 1, 0-20mA analog signal is converted into 0-2.0V voltage signal by signal sampling unit. The threshold value set by threshold setting unit is 1.6V (80% of full scale), the hysteresis value set by hysteresis setting unit is 1.7V (85% of full scale), and the input analog signal is initially full scale 2.0V.

[0074] Step 2, when the input analog signal gradually drops from 2.0V to 1.7V, OUT2 of the comparison unit outputs a high level, and when the input analog signal continues to drop to 1.6V, OUT1 of the comparison unit outputs a high level, and at this time, OUT of the trigger unit outputs a high level unlock trigger signal. Before the input analog signal is restored to 1.7V, the high level unlock trigger signal output will be maintained. This ensures that the signal is stably output within the hysteresis value near the threshold, avoiding switching back and forth between the unlock trigger signal and the non-trigger signal near the threshold.

[0075] Step 3, when the input analog signal gradually increases from less than 1.6V to 1.7V, the OUT2 of the comparison unit outputs a low level, and the OUT of the trigger unit outputs a low level to unlock the non-trigger signal. The input and output signals of the threshold comparison module are as follows: Figure 5 shown.

[0076] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A core pressure relief explosion valve controller unlocking device threshold comparison module, characterized in that: The threshold comparison module comprises: A comparison unit, wherein three input terminals of the comparison unit are respectively connected to the threshold value output by the threshold setting unit, the analog signal output by the signal sampling unit, and the hysteresis value output by the hysteresis setting unit, and the comparison unit performs logic processing on the input threshold value, analog signal, and hysteresis value to generate a threshold trigger signal and a hysteresis trigger signal; and a trigger unit, which performs logic processing on the threshold trigger signal and the hysteresis trigger signal to generate an unlock trigger signal or an unlock non-trigger signal; The threshold value setting unit and the hysteresis setting unit obtain the threshold value and the hysteresis value based on the same reference source, the settings of the threshold value and the hysteresis value are independent of each other, and the threshold value generated by the threshold value setting unit is smaller than the hysteresis value generated by the hysteresis setting unit; The processing logic of the comparison unit is: When the analog signal output by the signal sampling unit is less than the threshold value output by the threshold setting unit, the threshold trigger signal output by the comparison unit is a high level, otherwise the threshold trigger signal output by the comparison unit is a low level; When the analog signal output by the signal sampling unit is less than the hysteresis value output by the hysteresis setting unit, the hysteresis trigger signal output by the comparison unit is a high level, otherwise the hysteresis trigger signal output by the comparison unit is a low level; The processing logic of the trigger unit is: When the threshold trigger signal and the hysteresis trigger signal are both at low levels, the trigger unit outputs a low-level unlocking non-trigger signal; When the threshold trigger signal and the hysteresis trigger signal are both at high levels, the trigger unit outputs a high-level unlock trigger signal; after the trigger unit outputs a high-level unlock trigger signal and before the hysteresis trigger signal becomes low level, the trigger unit keeps outputting a high-level unlock trigger signal; When the hysteresis trigger signal becomes a low level, the trigger unit outputs a low level unlock non-trigger signal.

2. A core pressure relief burst valve controller unlocking device threshold comparison module according to claim 1, characterized in that: The signal sampling unit is used to convert the current analog signal into a voltage signal.

3. A core pressure relief burst valve controller unlocking device threshold comparison module according to claim 2, characterized in that: The signal sampling unit includes a precision resistor and an instrument operational amplifier; The maximum common-mode rejection ratio and the lowest linearity error are obtained by setting the amplification factor of the instrument operational amplifier.

4. A core pressure relief burst valve controller unlocking device threshold comparison module according to claim 1, characterized in that: The threshold setting unit and the hysteresis setting unit are both divided into fixed gear setting and continuous gear setting; The fixed gear setting and the continuous gear setting are switched by a switching switch.

5. A core pressure relief burst valve controller unlocking device threshold comparison module according to claim 4, characterized in that: The fixed gear setting uses a high-precision voltage divider network to divide the voltage of the reference source to obtain thresholds or hysteresis values ​​of different gears; The fixed gear setting uses a rotary switch to switch between different thresholds or hysteresis values.

6. A core pressure relief burst valve controller unlocking device threshold comparison module according to claim 5, characterized in that: The switching of the threshold value and the hysteresis value can be performed simultaneously.

7. A core pressure relief explosion valve controller unlocking device threshold comparison module according to claim 4, characterized in that: The continuous gear setting adopts a high-precision voltage regulating network to perform voltage division regulation on the reference source, and can continuously set any threshold value or hysteresis value within a set range.

8. A core pressure relief explosion valve controller unlocking device, characterized in that: The unlocking device comprises the threshold comparison module as described in any one of claims 1 to 7, and the threshold comparison module is used for automatically triggering unlocking by the analog signal of the unlocking device, so that the unlocking device outputs an unlocking non-trigger signal under normal working conditions; under abnormal working conditions, when the analog signal is lower than the threshold, an unlocking trigger signal is output, and when the analog signal reaches the hysteresis value, an unlocking non-trigger signal is output.

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