Voltage monitoring circuit

Abstract

The embodiment of the invention provides a voltage monitoring circuit, and belongs to the technical field of integrated circuits. The voltage monitoring circuit comprises a specification configuration circuit, a voltage monitoring module and a latch module. The specification configuration circuit is used for acquiring a to-be-tested signal, and performing voltage division on the to-be-tested signal through a divider resistor with preset parameters to obtain an upper limit voltage and a lower limit voltage corresponding to the to-be-tested signal; the voltage monitoring module is connected with the specification configuration circuit, and is used for comparing the upper limit voltage with the rising threshold voltage through a window comparator, comparing the lower limit voltage with the falling threshold voltage, and outputting a comparison result; and the latch module is connected with the voltage monitoring module and is used for outputting an abnormal indication signal and latching the abnormal indication signal under the condition that the comparison result represents abnormity. According to the embodiment of the invention, the processing speed of the abnormal signal is improved, and the instant abnormal phenomenon of the to-be-detected signal is monitored.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of integrated circuits, in particular to a voltage monitoring circuit. BACKGROUND

[0002] With the rapid development of science and technology, various electronic products play an important role in various industries, such as automated production equipment on the production line, portable medical instruments in life, etc. The emergence of such dehumanized electronic products greatly improves production efficiency and significantly improves people's living standards; but the safety problems of electronic products that follow are also common, such as fires caused by line short circuits, car electronic door lock failures that prevent doors from being opened, and production line automation equipment accidents that cause injuries, which cause very serious harm. Therefore, the importance of the safety of electronic products or systems and the fault handling mechanism is self-evident.

[0003] In various electronic products or systems, various ways of monitoring the voltage of key signals are used to ensure that the product or system is in a safe working state. However, these monitoring functions will increase the cost of the product or system, and some monitoring mechanisms have low real-time performance or cannot monitor transient abnormalities, resulting in failure to intervene and handle in a timely manner after a fault occurs. In the face of these difficulties, some low-cost products or systems cancel the monitoring mechanism or use a low-cost, low-time-effective fault handling mechanism, resulting in a certain degree of safety hazard in the product or system.

[0004] In related technologies, the voltage monitoring method for electronic products is usually to sample the voltage value of the to-be-measured signal through an ADC, and then calculate whether the collected voltage value exceeds the preset range by an MCU to realize voltage monitoring. However, this method needs to perform analog-to-digital conversion through an ADC and then analyze by a software program in the MCU, which is time-consuming and costly. In addition, since the ADC may not be able to sample transient change signals, it may not be able to monitor whether the voltage of the to-be-measured signal instantaneously exceeds the specification range.

[0005] In summary, the technical problems in related technologies need to be improved. SUMMARY

[0006] The main purpose of the embodiments of the present application is to provide a voltage monitoring circuit, which aims to improve the processing efficiency of signals.

[0007] To achieve the above purpose, one aspect of an embodiment of the present application provides a voltage monitoring circuit, which comprises a specification configuration circuit, a voltage monitoring module and a latch module. The specification configuration circuit is configured to obtain a to-be-measured signal, and perform voltage division on the to-be-measured signal through a voltage division resistor of a preset parameter to obtain an upper limit voltage and a lower limit voltage corresponding to the to-be-measured signal. The voltage monitoring module is connected with the specification configuration circuit, and is configured to compare magnitudes of the upper limit voltage and the rising threshold voltage and compare the lower limit voltage and the falling threshold voltage by using a window comparator, and output a comparison result; The latch module is connected with the voltage monitoring module, and is configured to output an abnormality indication signal in a case where the comparison result represents an abnormality, and latch the abnormality indication signal.

[0008] In some embodiments, the voltage monitoring circuit further comprises an alarm module; The alarm module is connected with the latch module, and comprises a relay module and a loudspeaker, wherein the relay module is connected with the loudspeaker, and the relay module is configured to control the loudspeaker to sound according to the abnormality indication signal.

[0009] In some embodiments, the alarm module further comprises a connector, and the connector is connected with the relay module; The alarm module is further configured to control both ends of an input end of the connector to be short-circuited according to the abnormality indication signal; The connector is configured to generate a fault signal in a state where the input end is short-circuited, and the fault signal is configured to control a to-be-detected module generating the to-be-measured signal to stop running.

[0010] In some embodiments, the specification configuration circuit comprises a plurality of input channels, and the input channels are independent of each other, each of the input channels is configured to collect a to-be-measured signal, and perform voltage division on the collected to-be-measured signal to obtain an upper limit voltage and a lower limit voltage corresponding to the to-be-measured signal.

[0011] In some embodiments, each of the input channels comprises a first input port, a first resistor and a second resistor, the first input port is connected with a first end of the first resistor, and a second end of the first resistor is connected with a first end of the second resistor; The first input port is configured to acquire a to-be-measured signal; The first resistor is configured to perform first voltage division on the to-be-measured signal to obtain the upper limit voltage; The second resistor is configured to perform second voltage division on the upper limit voltage to obtain the lower limit voltage.

[0012] In some embodiments, the voltage monitoring module comprises a plurality of first output ports, a second input port, a third input port and a window comparator; The second input port is configured to acquire the upper limit voltage; The third input port is configured to acquire the lower limit voltage; The window comparator is configured to compare whether the upper limit voltage is greater than the rising threshold voltage, and compare whether the lower limit voltage is less than the falling threshold voltage. The first output port is configured to output a comparison result indicating an abnormality when the upper limit voltage is greater than the rising threshold voltage or the lower limit voltage is less than the falling threshold voltage.

[0013] In some embodiments, the voltage monitoring module further comprises a second output port. The second output port is configured to output an overvoltage detection signal when the upper limit voltage is greater than the rising threshold voltage.

[0014] In some embodiments, the latch module comprises a second latch and a plurality of first latches. The first latch is configured to output an abnormality indication signal when the comparison result indicates an abnormality, and latch the abnormality indication signal. The second latch is configured to output an overvoltage indication signal in response to the overvoltage detection signal, and latch the overvoltage indication signal.

[0015] In some embodiments, the latch module further comprises a plurality of display circuits, and the display circuit comprises an indicator light. The display circuit is respectively connected to the first latch and the second latch. The display circuit is configured to drive the indicator light to operate in response to the abnormality indication signal. The display circuit is configured to drive the indicator light to operate in response to the overvoltage indication signal.

[0016] In some embodiments, the latch module further comprises a reset circuit. The output terminal of the reset circuit is connected to the reset port of the first latch and the second latch, respectively. The reset circuit is configured to output a reset signal to the first latch and the second latch, respectively, to release the latching state of the first latch and the second latch.

[0017] The embodiments of the present application at least have the following beneficial effects: the present application provides a voltage monitoring circuit, which comprises a specification configuration circuit, a voltage monitoring module and a latch module; the specification configuration circuit is used to acquire a to-be-tested signal, and the to-be-tested signal is divided by a voltage dividing resistor with preset parameters to obtain an upper limit voltage and a lower limit voltage corresponding to the to-be-tested signal; the voltage monitoring module is connected to the specification configuration circuit, and the voltage monitoring module is used to compare the upper limit voltage and an upper threshold voltage by a window comparator, and compare the lower limit voltage and a lower threshold voltage, and output a comparison result; the latch module is connected to the voltage monitoring module, and the latch module is used to output an abnormal indication signal in the case that the comparison result represents an abnormality, and latch the abnormal indication signal.

[0018] The voltage monitoring circuit of the present application is a pure hardware circuit design, which analyzes and processes signals by pure hardware without software processing. The continuously acquired to-be-tested signal is divided by a voltage dividing resistor with preset parameters to quickly determine the upper limit voltage and the lower limit voltage of the to-be-tested signal. The upper limit voltage and the lower limit voltage represent the allowable specification range of the to-be-tested signal. The upper limit voltage and the lower limit voltage are compared by the comparator of the voltage monitoring module, which can quickly determine whether the to-be-tested signal exceeds the specification range. The pure hardware design improves the response rate of the voltage monitoring module, and realizes the rapid processing of signals. The latch function of the latch module can keep the abnormal indication signal output by the latch unchanged, thereby monitoring the instantaneous abnormal phenomenon of the to-be-tested signal. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a structural schematic diagram of a voltage monitoring circuit provided by the embodiments of the present application; Figure 2 FIG. 2 is a structural schematic diagram of a specification configuration circuit provided by the embodiments of the present application; Figure 3 FIG. 3 is a structural schematic diagram of a voltage monitoring module provided by the embodiments of the present application; Figure 4 FIG. 4 is a structural schematic diagram of a latch module and a display circuit provided by the embodiments of the present application; Figure 5 FIG. 5 is a structural schematic diagram of a reset circuit provided by the embodiments of the present application; Figure 6 FIG. 6 is a structural schematic diagram of an alarm module provided by the embodiments of the present application; Figure 7 FIG. 7 is a system architecture schematic diagram of a voltage monitoring circuit provided by the embodiments of the present application. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application. When the following description relates to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with embodiments of the present application, but are only examples of devices and methods consistent with some aspects of the embodiments of the present application as detailed in the appended claims.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the specification herein is for describing the embodiments of the present application only and is not intended to limit the present application.

[0022] With the rapid development of science and technology, various electronic products play an important role in various industries, such as automated production equipment on production lines, portable medical instruments in life, etc. The emergence of such dehumanized electronic products greatly improves production efficiency and significantly improves people's living standards; but the safety problems of electronic products that follow are also common, such as fire caused by line short circuit, failure of car electronic door lock to open the door, and injury accident of production line automation equipment, which cause very serious harm. Therefore, the importance of safety and fault handling mechanism of electronic products or systems is self-evident.

[0023] In various electronic products or systems, various ways of monitoring the voltage of key signals are used to ensure that the product or system is in a safe working state. However, these monitoring functions will increase the cost of the product or system, and some monitoring mechanisms have low real-time performance or cannot monitor transient abnormalities, resulting in failure to intervene and handle in a timely manner after a fault occurs. In the face of these difficulties, some low-cost products or systems cancel the monitoring mechanism or use a low-cost, low-time-effective fault handling mechanism, resulting in a certain degree of safety hazard in the product or system.

[0024] The main shortcomings in the related art are as follows: The MCU (Micro Controller Unit, microcontroller unit) controls the ADC to sample the signal to be measured, or the signal to be measured and the reference signal are compared by the comparator, and output to the MCU, and then the MCU analyzes and processes through the software program to realize the monitoring function, but the scheme has poor timeliness and high cost; The monitoring of special signals does not have universality and can only monitor a single signal; Some voltage monitoring mechanisms are unable to detect when the signal under test momentarily exceeds the specified range, resulting in the inability to intervene and handle the fault in a timely manner.

[0025] Based on this, this application proposes a voltage monitoring circuit to improve signal processing efficiency and detect when a signal momentarily exceeds the specified range.

[0026] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a voltage monitoring circuit provided in an embodiment of this application. The voltage monitoring circuit includes a specification configuration circuit, a voltage monitoring module, and a latch module. The specification configuration circuit is used to acquire the signal to be tested, and divides the signal to be tested by a voltage divider resistor with preset parameters to obtain the upper limit voltage and lower limit voltage corresponding to the signal to be tested; The voltage monitoring module is connected to the specification configuration circuit. The voltage monitoring module is used to compare the upper limit voltage and the rising threshold voltage, as well as the lower limit voltage and the falling threshold voltage, through a window comparator, and output the comparison results. The latch module is connected to the voltage monitoring module. The latch module is used to output an abnormality indication signal and latch the abnormality indication signal when the comparison result indicates an abnormality.

[0027] Specifically, the specification configuration circuit includes an external interface circuit that connects to the electronic product or system requiring voltage monitoring. The signal to be measured is generated by the external electronic product or system and input to the specification configuration circuit. The specification configuration circuit includes multiple input channels, each independent, capable of receiving and processing one signal to be measured. Voltage division of the signal to be measured can be achieved using a circuit with multiple resistors connected in series. The resistance values ​​are determined by the specification range of the signal to be measured and the voltage monitoring module; the specification range represents the allowable variation range of the signal. The voltage monitoring module can determine whether the signal to be measured exceeds the specification range based on the upper and lower voltage limits and output the corresponding comparison result. The comparison result can be represented as a high-level signal or a low-level signal. Since each input channel outputs an upper and lower voltage limit, the voltage monitoring module has two input ports for each input channel; the signals from each pair of input ports determine the comparison result output from one output port. The rising threshold voltage of the second input port and the falling threshold voltage of the third input port are determined by the hardware characteristics of the voltage monitoring module. For example, when the voltage of all the signals under test is within the specified range, the voltage monitoring module outputs a high-level signal. When the voltage of the signal under test in a certain channel exceeds the specified range, the corresponding output port of the voltage monitoring module will output a low-level signal to indicate that the signal under test is abnormal. When the latch module receives a low-level signal, the latch module outputs an abnormality indication signal (such as a low-level signal). By latching and maintaining the low-level output state, the latch module latches the state of the signal under test momentarily exceeding the specified range. This can be communicated to the user through a warning device, allowing the user to be aware of the abnormality in a timely manner and avoid ignoring momentary abnormalities. In addition, the embodiments of this application use pure hardware circuits to analyze and process the signal, eliminating the need for software processing, thereby improving the response rate and enabling rapid processing of fault signals.

[0028] In some embodiments, the voltage monitoring circuit further includes an alarm module; The alarm module is connected to the latching module. The alarm module includes a relay module and a speaker. The relay module is connected to the speaker and is used to control the speaker to sound according to the abnormal indication signal.

[0029] Specifically, please refer to Figure 6 For example, the alarm module includes six input channels, each connected to a different first latch output terminal. D1-D6 are ordinary diodes that monitor the output signals of the six first latches. If any first latch outputs a low level, the relay module is driven. The relay module includes K1, D7, R17 and LED8. After the relay module is driven, the speaker SPK emits an alarm sound signal, thereby promptly informing the user of the abnormal situation of the device under test.

[0030] In some embodiments, the alarm module further includes a connector that connects to the relay module; The alarm module is also used to short-circuit the two ends of the connector's input terminal based on the abnormal indication signal; The connector is used to generate a fault signal after a short circuit at the input terminal. The fault signal is used to control the module under test that generates the signal to be tested to stop operating.

[0031] Specifically, please refer to Figure 6 The connector can be a Fixture connector. When the relay module is driven, the speaker emits an alarm sound, and at the same time, the two pins of the Fixture connector are short-circuited. This can serve as a fault signal interface to feed back to the module under test or the system, thereby controlling the module under test to stop working and stopping its abnormal operation, thus improving operational safety.

[0032] In some embodiments, the configuration circuit includes multiple input channels, which are independent of each other. Each input channel is used to acquire a signal to be tested and to divide the acquired signal to obtain the upper limit voltage and lower limit voltage corresponding to the signal to be tested.

[0033] Specifically, as in the above embodiment, each input channel is independent and does not affect the others. Each channel has a series resistor to divide the voltage of the signal under test, thereby meeting the range between the rising and falling threshold voltages required by the voltage monitoring module. Each input channel can receive the signal under test from an external device, and each input channel can independently acquire and divide multiple signals under test simultaneously.

[0034] In some embodiments, each input channel includes a first input port, a first resistor, and a second resistor, wherein the first input port is connected to a first end of the first resistor, and the second end of the first resistor is connected to the first end of the second resistor. The first input port is used to acquire the signal to be tested; The first resistor is used to perform the initial voltage division of the signal under test to obtain the upper limit voltage; The second resistor is used to perform a second voltage division on the upper limit voltage to obtain the lower limit voltage.

[0035] In some embodiments, please refer to Figure 2The circuit configuration has six channels. Connector J1 connects to an external device under test (DUT) or module. PS5V is the system voltage input through connector J1. VIN1-VIN6 are the signals under test. RxA, RxB, and RxC (x = 1-6) are the first, second, and third resistors, respectively. INxP and INxN (x = 1-6) are connected to the voltage monitoring module. The voltage at INxP is the upper limit voltage, and the voltage at INxN is the lower limit voltage. The voltage monitoring module can use a window comparator for voltage monitoring. The reference voltage of the window comparator and the specification range of the signal under test determine the resistance values ​​of RxA and RxB. The window comparator has two reference voltages: the rising threshold voltage (Vthr) and the falling threshold voltage (Vthf). The window comparator is set to the following values: , ; The specification range of the signal under test is Vuv (lower specification limit) to Vov (upper specification limit). RxC is set to a fixed resistance value. The calculation methods for the resistance values ​​of RxA and RxB are as follows: Overvoltage monitoring: ,(1); Undervoltage monitoring: (2); We can calculate from equations (1) and (2) as follows: ; ; For example, if the voltage of the signal to be measured is 3V, the specification range is set as follows: Lower limit of specifications: ; Maximum size: ; If RxC = 100KΩ is set, the values ​​of RxA and RxB are calculated, meaning the preset parameters of the voltage divider resistors can be set as follows: ; ; Therefore, each signal under test can be configured with an independent specification range by flexibly setting the resistance values ​​of RxA and RxB.

[0036] In some embodiments, the voltage monitoring module includes a plurality of first output ports, second input ports, third input ports, and a window comparator; The second input port is used to obtain the upper limit voltage; The third input port is used to obtain the lower limit voltage; The window comparator is used to compare whether the upper limit voltage is greater than the rising threshold voltage and whether the lower limit voltage is less than the falling threshold voltage. The first output port is used to output a comparison result indicating an anomaly when the upper limit voltage is greater than the rising threshold voltage or the lower limit voltage is less than the falling threshold voltage.

[0037] Specifically, please refer to Figure 3 The voltage monitoring module includes a window comparator, with U1 being a 6-channel window comparator; C1 is a power supply bypass capacitor; pins 1-12 are multiple second and third input ports, -INx is the third input port, +INx is the second input port, and x is 1-6. The same x represents the same pair of second and third input ports. INxP connects to +INx, and INxN connects to -INx. COx (x is 1-6) is the window comparator output (first output port). The comparison result of COx is determined by the voltages (i.e., upper and lower limits) of the same pair of second (+INx) and third (-INx) input ports. COPOL (PIN15 of U1) is connected to a low level. When the signal under test is within the specified range, i.e., the upper limit voltage is less than the preset rising threshold voltage and the lower limit voltage is greater than the preset falling threshold voltage, the comparison result indicating an anomaly output by COx is a high-level signal; otherwise, a low-level signal is output. The rising and falling threshold voltages are determined by the hardware characteristics of the window comparator itself.

[0038] In some embodiments, the voltage monitoring module further includes a second output port; The second output port is used to output an overvoltage detection signal if the upper limit voltage is greater than the rising threshold voltage.

[0039] Specifically, please refer to Figure 3 AOV is a set of 6-channel window comparator outputs. When AOSEL (PIN16 of U1) is connected to low level, when any of the signals under test is over-voltage (exceeding the upper limit of the specification), the over-voltage detection signal output by AO (second output port) is low level; otherwise, it is high level.

[0040] In some embodiments, the latching module includes a second latch and a plurality of first latches; The first latch is used to output an anomaly indication signal and latch the anomaly indication signal when the comparison result indicates an anomaly. The second latch is used to respond to the overvoltage detection signal, output an overvoltage indication signal, and latch the overvoltage indication signal.

[0041] Specifically, please refer to Figure 4 , Figure 4 In this context, (a)-(f) are the first latches. Figure 4In the diagram, (g) represents the second latch. Both the first and second latches can be D flip-flops (DFFs). U2-U8 are all DFF chips, and the truth table for the DFF chips is shown in Table 1. C2-C8 are power supply bypass capacitors, and R2, R4, R6, R8, R10, R12, and R14 are pull-up resistors for the flip-flop output. These components form the flip-flop latch circuit. When the first latch receives a comparison result indicating an anomaly or the second latch receives an overvoltage detection signal (i.e., when the COx and AOV signals change from high to low), the flip-flop output (PIN5 of the DFF) DFFx (x is 1-7) outputs a low level (overvoltage indication signal and anomaly indication signal) and latches this state. At this time, regardless of how the states of COx and AOV change, the output of DFFx will not change, thus enabling the monitoring of instantaneous overvoltage or undervoltage phenomena in the measured signal.

[0042] Table 1 Truth Table of DFF

[0043] In some embodiments, the latching module further includes several display circuits, including indicator lights; The display circuit is connected to the first latch and the second latch respectively; The display circuit is used to drive the indicator lights to operate in response to abnormal indication signals; The display circuit is used to drive the indicator lights in response to overvoltage indication signals.

[0044] Specifically, please refer to Figure 4 The indicator lights LEDx (x is 1-7) and series resistors (R3, R5, R7, R9, R11, R13, and R15) constitute seven display circuits. When DFFx outputs a low level, it drives LEDx to light up. Therefore, when the six signals under test are outside the specified range, the corresponding LED will light up; LED7 lighting up indicates that there is an overvoltage in the signal under test, and when LEDs 1-6 are lit while LED7 is not lit, it indicates that there is an undervoltage in the signal under test.

[0045] In some embodiments, the latch module further includes a reset circuit; The output of the reset circuit is connected to the reset ports of the first latch and the second latch, respectively. The reset circuit is used to output reset signals to the first latch and the second latch respectively, so as to release the latching state of the first latch and the second latch.

[0046] Specifically, please refer to Figure 5The reset circuit includes a tactile switch SW, R16, and C9. When the tactile switch SW is pressed, the PRE signal is set to a low level, and the DFF is unlocked and returns to the monitoring state.

[0047] In some embodiments, please refer to Figure 7 The system architecture of the voltage monitoring circuit includes the module to be monitored, input ports and specification configuration circuits, voltage monitoring module, latching and display module, and alarm module. The module to be monitored refers to an electronic product or system that requires voltage signal monitoring.

[0048] The input port and specification configuration circuit includes an external interface circuit, which connects to an external power supply and the signal under test. The power supply provides the voltage signal to the entire system, and each signal under test is configured with a corresponding specification range through different voltage divider resistors.

[0049] The voltage monitoring module includes a window comparator, which determines whether the signal under test is within the specified range and outputs the detection results in real time.

[0050] The latching and display module is used to monitor the output status of the voltage monitoring module. Once the output is abnormal (the signal under test exceeds the specification range), it drives the display module and alarm module and latches the current status. The alarm module includes a buzzer and an external output interface. The buzzer is used to indicate that the signal under test is abnormal, and the external output interface is used to feed back the abnormal signal to the module under test.

[0051] The embodiments of this application have at least one of the following beneficial effects: Simultaneously monitor the undervoltage or overvoltage status of multiple different voltage signals and set independent specification ranges; The monitoring and alarm functions are implemented using pure hardware circuitry, resulting in fast response and high security. The latching function design enables the monitoring of instantaneous overvoltage or undervoltage phenomena in the signal under test; It implements a 6-channel voltage monitoring and alarm circuit, which can be expanded to monitor more channels.

[0052] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of this application, and do not constitute a limitation on the technical solutions provided in this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in this application are also applicable to similar technical problems.

[0053] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0054] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0055] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0056] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0057] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0058] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0059] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A voltage monitoring circuit, characterized in that, The voltage monitoring circuit includes a specification configuration circuit, a voltage monitoring module, and a latch module; The specified configuration circuit is used to acquire the signal to be tested, and to divide the signal to be tested by a voltage divider resistor with preset parameters to obtain the upper limit voltage and lower limit voltage corresponding to the signal to be tested; The voltage monitoring module is connected to the specification configuration circuit. The voltage monitoring module is used to compare the upper limit voltage and the rising threshold voltage, and to compare the lower limit voltage and the falling threshold voltage through a window comparator, and output the comparison result. The latch module is connected to the voltage monitoring module. The latch module is used to output an abnormality indication signal and latch the abnormality indication signal when the comparison result indicates an abnormality.

2. The voltage monitoring circuit according to claim 1, characterized in that, The voltage monitoring circuit also includes an alarm module; The alarm module is connected to the latching module. The alarm module includes a relay module and a speaker. The relay module is connected to the speaker and is used to control the speaker to sound according to the abnormal indication signal.

3. The voltage monitoring circuit according to claim 2, characterized in that, The alarm module also includes a connector, which is connected to the relay module; The alarm module is also used to control the two ends of the input terminal of the connector to be short-circuited according to the abnormal indication signal; The connector is used to generate a fault signal when the input is short-circuited, wherein the fault signal is used to control the module under test that generates the signal to be tested to stop operating.

4. The voltage monitoring circuit according to claim 1, characterized in that, The specified configuration circuit includes multiple input channels, which are independent of each other. Each input channel is used to acquire one of the signals to be tested and to divide the acquired signals to obtain the upper limit voltage and lower limit voltage corresponding to the signals to be tested.

5. The voltage monitoring circuit according to claim 4, characterized in that, Each input channel includes a first input port, a first resistor, and a second resistor, wherein the first input port is connected to a first end of the first resistor, and the second end of the first resistor is connected to the first end of the second resistor; The first input port is used to acquire the signal to be tested; The first resistor is used to perform an initial voltage division on the signal under test to obtain the upper limit voltage; The second resistor is used to perform a second voltage division on the upper limit voltage to obtain the lower limit voltage.

6. The voltage monitoring circuit according to claim 1, characterized in that, The voltage monitoring module includes several first output ports, second input ports, third input ports, and a window comparator; The second input port is used to obtain the upper limit voltage; The third input port is used to obtain the lower limit voltage; The window comparator is used to compare whether the upper limit voltage is greater than the rising threshold voltage, and to compare whether the lower limit voltage is less than the falling threshold voltage. The first output port is used to output a comparison result indicating an anomaly when the upper limit voltage is greater than the rising threshold voltage or the lower limit voltage is less than the falling threshold voltage.

7. The voltage monitoring circuit according to claim 6, characterized in that, The voltage monitoring module also includes a second output port; The second output port is used to output an overvoltage detection signal when the upper limit voltage is greater than the rising threshold voltage.

8. The voltage monitoring circuit according to claim 7, characterized in that, The latch module includes a second latch and several first latches; The first latch is used to output an anomaly indication signal and latch the anomaly indication signal when the comparison result indicates an anomaly. The second latch is used to respond to the overvoltage detection signal, output an overvoltage indication signal, and latch the overvoltage indication signal.

9. The voltage monitoring circuit according to claim 8, characterized in that, The latching module also includes several display circuits, and the display circuits include indicator lights; The display circuit is connected to the first latch and the second latch respectively; The display circuit is used to drive the indicator light to operate in response to the abnormal indication signal; The display circuit is used to drive the indicator light to operate in response to the overvoltage indication signal.

10. The voltage monitoring circuit according to claim 8, characterized in that, The latch module also includes a reset circuit; The output of the reset circuit is connected to the reset ports of the first latch and the second latch, respectively; The reset circuit is used to output reset signals to the first latch and the second latch respectively, so as to release the latching state of the first latch and the second latch.

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