Method and device for detecting high-voltage safety loop, electronic equipment and storage medium

Abstract

The application provides a high-voltage safety loop detection method and device, electronic equipment and a storage medium. The method comprises the following steps: real-time sampling of a high-voltage safety signal of a high-voltage safety loop of an elevator; converting the high-voltage safety signal into a first low-voltage signal and a square wave signal, and converting the first low-voltage signal into a voltage actual value; determining whether the high-voltage safety loop is faulty through the voltage actual value, the square wave signal, a preset first voltage threshold value and a preset detection time threshold value; and triggering a fault alarm process if the high-voltage safety loop is faulty. The analog quantity and digital quantity double-checking mechanism is used to detect the fault of the high-voltage safety loop of the elevator, so as to ensure the accuracy and timeliness of the fault detection of the high-voltage safety loop, thereby avoiding the risk of arc in the running contactor.

Description

Technical Field

[0001] This invention relates to the field of signal detection technology, and specifically to a method, apparatus, electronic device, and storage medium for detecting high-voltage safety circuits. Background Technology

[0002] When any switch in the elevator's high-voltage safety circuit trips, the coil of the elevator's running contactor (also known as the main circuit contactor) loses power, and the main contacts of the running contactor quickly open. When the main contacts of the running contactor open, an extremely high self-induced electromotive force is generated between the contacts, leading to air breakdown and arcing. This high-temperature arc can cause severe erosion of the main contacts of the running contactor, reducing its service life and operational reliability.

[0003] The common method for detecting high-voltage safety circuits is to send a high-voltage safety signal to the elevator control system. When the safety circuit signal is detected to be disconnected, the elevator control system stops outputting. However, the elevator's running contactor operates very quickly. If the elevator control system's detection time for the high-voltage safety signal exceeds the operating contactor's operating time, the running contactor may experience arcing, thus affecting its service life and operational reliability.

[0004] Therefore, there is an urgent need for a way to quickly detect whether there is a fault in the high-voltage safety circuit of an elevator, in order to avoid the risk of arcing in the operating contactor. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a method, apparatus, electronic device and storage medium for detecting high-voltage safety circuits, so as to quickly detect whether there is a fault in the high-voltage safety circuit of an elevator.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] The first aspect of this invention discloses a method for detecting a high-voltage safety circuit, the method being applicable to an elevator control system, the method comprising:

[0008] Real-time sampling of the high-voltage safety signal in the elevator's high-voltage safety circuit;

[0009] The high-voltage safety signal is converted into a first low-voltage signal and a square wave signal, and the first low-voltage signal is converted into an actual voltage value.

[0010] The fault status of the high-voltage safety circuit is determined by the actual voltage value, the square wave signal, the preset first voltage threshold, and the preset detection time threshold.

[0011] If the high-voltage safety circuit fails, a fault alarm process is triggered.

[0012] Preferably, determining whether the high-voltage safety circuit is faulty by using the actual voltage value, the square wave signal, a preset first voltage threshold, and a preset detection time threshold includes:

[0013] The first accumulated count value is determined by the actual voltage value and the preset first voltage threshold, and the duration of high level and duration of low level are counted by the square wave signal.

[0014] The first accumulated count value is corrected, and the product between the corrected first accumulated count value and the pulse width modulation carrier period of the elevator's frequency converter is calculated to obtain the actual accumulated time.

[0015] If the actual cumulative time is greater than the preset detection time threshold, and / or if the duration of the low level is greater than the first duration threshold, the high-voltage safety circuit is determined to be faulty.

[0016] If the actual cumulative time is less than the detection time threshold, and if the duration of the high level is greater than the second duration threshold, then the high-voltage safety circuit is determined to be fault-free.

[0017] Preferably, the process of determining the first accumulated count value by means of the actual voltage value and a preset first voltage threshold includes:

[0018] When the actual voltage value is less than the first voltage threshold, the counter is incremented during the pulse width modulation carrier period interruption of the elevator's frequency converter to obtain the first accumulated value.

[0019] When the actual voltage value is greater than the first voltage threshold, the counter is cleared to obtain the first accumulated value with a value of 0.

[0020] Preferably, the process of correcting the first accumulated count value includes:

[0021] Calculate the difference between the actual voltage value and the voltage reference value to obtain a first difference;

[0022] If the first difference is greater than the second voltage threshold, the time interval corresponding to the change process of the input voltage of the high-voltage safety circuit is converted into a second accumulated count value;

[0023] If the first accumulated count value is greater than the second accumulated count value, calculate the difference between the first accumulated count value and the second accumulated count value to obtain the second difference value;

[0024] The second difference is determined to be the corrected first accumulated count value.

[0025] Preferred options also include:

[0026] When the actual voltage value is greater than the first voltage threshold, the voltage reference value is assigned the first voltage threshold to update the voltage reference value;

[0027] When the actual voltage value is less than the first voltage threshold, and when the actual voltage value is less than the voltage reference value, the voltage reference value is assigned the actual voltage value to update the voltage reference value.

[0028] Preferred options also include:

[0029] If the first accumulated count value is less than or equal to the second accumulated count value, the first accumulated count value is set to 0, and the voltage reference value is set to the actual voltage value to update the voltage reference value.

[0030] Preferably, the process of converting the high-voltage safety signal into a first low-voltage signal and a square wave signal includes:

[0031] The high-voltage safety signal is converted into a first low-voltage signal through a voltage divider circuit and an isolation circuit;

[0032] The high-voltage safety signal is converted into a square wave signal by a shaping circuit.

[0033] A second aspect of this invention discloses a detection device for a high-voltage safety circuit, the device being applicable to an elevator control system, the device comprising:

[0034] The sampling unit is used to sample the high-voltage safety signal of the elevator's high-voltage safety circuit in real time.

[0035] The conversion unit is used to convert the high-voltage safety signal into a first low-voltage signal and a square wave signal, and to convert the first low-voltage signal into an actual voltage value;

[0036] The judgment unit is used to determine whether the high-voltage safety circuit is faulty by using the actual voltage value, the square wave signal, the preset first voltage threshold and the preset detection time threshold.

[0037] An alarm unit is used to trigger a fault alarm process if the high-voltage safety circuit fails.

[0038] A third aspect of the present invention discloses a computer device, comprising: a processor and a memory, the processor and the memory being connected via a bus; wherein, the processor is used to call and execute a program stored in the memory; the memory is used to store the program, the program being used to implement the high-voltage safety circuit detection method disclosed in the first aspect of the present invention.

[0039] A fourth aspect of the present invention discloses a storage medium storing computer-executable instructions for executing the high-voltage safety circuit detection method disclosed in the first aspect of the present invention.

[0040] Based on the above embodiments of the present invention, a method, apparatus, electronic device, and storage medium for detecting a high-voltage safety circuit are provided. The method involves: real-time sampling of the high-voltage safety signal of the elevator's high-voltage safety circuit; converting the high-voltage safety signal into a first low-voltage signal and a square wave signal, and converting the first low-voltage signal into an actual voltage value; determining whether the high-voltage safety circuit is faulty using the actual voltage value, the square wave signal, a preset first voltage threshold, and a preset detection time threshold; and triggering a fault alarm process if the high-voltage safety circuit is faulty. A dual verification mechanism using analog and digital signals is employed to detect faults in the elevator's high-voltage safety circuit, ensuring the accuracy and timeliness of fault detection and thus avoiding the risk of arcing in the operating contactor. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0042] Figure 1 A flowchart illustrating a detection method for a high-voltage safety circuit provided in an embodiment of the present invention;

[0043] Figure 2 This is a flowchart for determining whether a high-voltage safety circuit is faulty, provided in an embodiment of the present invention.

[0044] Figure 3 This is a structural block diagram of a high-voltage safety circuit detection device provided in an embodiment of the present invention. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] The core components of an elevator's high-voltage safety circuit typically include an emergency stop switch, safety gear switch, speed governor switch, hall / car door interlock switch, and pit protection switch. When any switch in the high-voltage safety circuit trips, the coil of the elevator's running contactor (also known as the main circuit contactor) is de-energized, and the main contacts of the running contactor quickly open. At this moment, the elevator's frequency converter is still in output mode. At the instant the main contacts of the running contactor open, the load is the high-current frequency converter in operation (equivalent to a strong inductive source). When the large inductive load current is forcibly cut off, an extremely high self-induced electromotive force is generated between the contacts of the running contactor, leading to air breakdown and arcing. The high-temperature arc will cause severe erosion of the main contacts of the running contactor, resulting in increased contact resistance, intensified contact heating, and even contact adhesion failure, significantly reducing the service life and operational reliability of the running contactor.

[0048] Research has revealed that the common method for detecting high-voltage safety circuits involves sending a high-voltage safety signal to the elevator control system. When the safety circuit signal is detected as disconnected, the elevator control system stops outputting. However, the elevator's operating contactor operates very rapidly. If the elevator control system's detection time for the high-voltage safety signal exceeds the operating contactor's operating time, the operating contactor risks arcing, thus affecting its lifespan and operational reliability.

[0049] To address this, this invention provides a method, device, electronic equipment, and storage medium for detecting high-voltage safety circuits. The method involves real-time sampling of the high-voltage safety signal from the elevator's high-voltage safety circuit, converting the high-voltage safety signal into a first low-voltage signal and a square wave signal, and then converting the first low-voltage signal into an actual voltage value. The actual voltage value, the square wave signal, a preset first voltage threshold, and a preset detection time threshold are used to determine if the high-voltage safety circuit is faulty. If the high-voltage safety circuit is faulty, a fault alarm process is triggered. A dual verification mechanism using analog and digital signals is employed to detect faults in the elevator's high-voltage safety circuit, ensuring the accuracy and timeliness of fault detection and thus avoiding the risk of arcing in the operating contactor.

[0050] See Figure 1The diagram shows a flowchart of a high-voltage safety circuit detection method provided by an embodiment of the present invention. This detection method is applicable to elevator control systems and includes:

[0051] Step S101: Real-time sampling of the high-voltage safety signal of the elevator's high-voltage safety circuit.

[0052] In the specific implementation step S101, the high-voltage safety signal of the elevator's high-voltage safety circuit is sampled in real time according to the preset sampling period. This high-voltage safety signal is the original signal of the high-voltage safety circuit.

[0053] For example, the high-voltage safety signal is a high-voltage AC110V voltage signal.

[0054] Step S102: Convert the high-voltage safety signal into a first low-voltage signal and a square wave signal, and convert the first low-voltage signal into the actual voltage value.

[0055] In the specific implementation step S102, the high-voltage safety signal is connected to the voltage conversion circuit for preprocessing, thereby converting the high-voltage safety signal into a first low-voltage signal and a square wave signal.

[0056] In some specific embodiments, the voltage conversion circuit includes at least a voltage divider circuit, an isolation circuit, and a shaping circuit. The specific implementation of converting the high-voltage safety signal into a first low-voltage signal and a square wave signal is as follows: the high-voltage safety signal is converted into a first low-voltage signal through a voltage divider circuit and an isolation circuit, and the high-voltage safety signal is converted into a square wave signal through a shaping circuit (such as a Schmitt trigger).

[0057] In other words, on the one hand, the high-voltage safety signal is linearly converted into a first low-voltage signal that matches the input range of the elevator control system through voltage divider circuits and isolation circuits. This first low-voltage signal is directly sent to the analog-to-digital converter (AD) detection port of the elevator control system. On the other hand, the high-voltage safety signal is converted into a square wave signal with clear edges through shaping circuits such as Schmitt triggers. This square wave signal is then sent to the digital input terminal of the elevator control system.

[0058] It should be noted that the analog-to-digital converter (AD) detection port achieves a rapid response to the disconnection of the high-voltage safety signal in the high-voltage safety circuit thanks to its high-speed sampling characteristics. It also combines the shaped digital signal (square wave signal) of the high-voltage safety circuit to form a dual verification mechanism of analog and digital signals, thereby improving the accuracy of detecting the "normal state" and "disconnected state" of the high-voltage safety signal. The specific detection method will be explained in subsequent steps.

[0059] In some embodiments, the specific implementation of converting the first low-voltage signal into the actual voltage value (denoted as Vin) is as follows: the first low-voltage signal is converted into the actual voltage value (Vin) by formula (1).

[0060] Vin = K * (Vad - Vbios) (1);

[0061] In formula (1), K is the voltage conversion coefficient calculated based on parameters such as the ratio of the hardware voltage divider resistors and the operational amplifier gain, Vad is the first low-voltage signal (that is, the original AD value obtained in the current sampling period), and Vbios is the zero-bias voltage learned and stored by the elevator control system at the factory. Formula (1) can ensure the accurate conversion of AD value to actual voltage value.

[0062] It should be noted that during the factory testing phase, the elevator control system needs to complete the automatic learning of the zero bias voltage (Vbios) of the analog circuit detection hardware. The automatic learning process is as follows: disconnect the voltage input of the external high-voltage safety circuit, and repeatedly collect and average the sampled value of the analog AD detection port (that is, the low-voltage signal, the acquisition method can be referred to the acquisition method of the first low-voltage signal) to obtain the zero bias voltage (Vbios). This zero bias voltage is stored in the internal parameter area of ​​the non-volatile memory of the elevator control system. This zero bias voltage (Vbios) can be understood as "the zero bias sampled AD value of the midpoint voltage when there is no external high-voltage input stored in the factory learning".

[0063] During the actual operation of the elevator, after obtaining the first low voltage signal, the first low voltage signal is converted in real time using the above formula (1) through the pulse width modulation (PWM) interrupt service, so as to obtain the actual voltage value (Vin).

[0064] Step S103: Determine whether the high-voltage safety circuit is faulty by using the actual voltage value, square wave signal, preset first voltage threshold, and preset detection time threshold. If the high-voltage safety circuit is faulty, proceed to step S104; if the high-voltage safety circuit is fault-free, determine that the high-voltage safety circuit is normal.

[0065] In the specific implementation of step S103, the high-voltage safety circuit is determined to be faulty by using the actual voltage value (Vin), the square wave signal, the preset first voltage threshold (denoted as Vth), and the preset detection time threshold (denoted as T). If the high-voltage safety circuit is faulty (that is, the high-voltage safety signal is determined to be disconnected), step S104 is executed. If the high-voltage safety circuit is fault-free, the high-voltage safety circuit is determined to be normal.

[0066] Step S104: Trigger the fault alarm process.

[0067] In the specific implementation of step S104, if the high-voltage safety circuit fails, a fault alarm process for the high-voltage safety circuit is triggered, and the voltage sampling data (high-voltage safety signal and other data) and timestamp at the time of the fault are recorded.

[0068] In this embodiment of the invention, a dual verification mechanism of analog and digital quantities is used to detect faults in the high-voltage safety circuit of the elevator, ensuring the accuracy and timeliness of fault detection in the high-voltage safety circuit, thereby avoiding the risk of arcing in the operating contactor.

[0069] It should be noted that during the initialization phase, the elevator control system needs to configure the detection time threshold (T) and calculate the first voltage threshold (Vth). The following will explain how to obtain the detection time threshold (T) and the first voltage threshold (Vth).

[0070] During the initialization phase of the elevator control system, the detection time threshold (T) needs to be configured. The value range of the detection time threshold (T) can be 2ms-5ms (for example only). The specific value can be modified and set according to the actual situation and functional parameters.

[0071] Set the minimum effective value of the high-voltage safety circuit voltage (denoted as Vmin). Vmin is generally set to 60% of the rated operating voltage (AC110V), that is, Vmin can be set to 66V (for example only), which can meet the safety specifications.

[0072] The first voltage threshold (Vth) is dynamically set according to the detection time threshold (T). Specifically, the first voltage threshold (Vth) is calculated by formula (2).

[0073] Vth=0.5*Vmin* 1.414 * sin(314*T / 2)(2);

[0074] It should be noted that 1.414 in formula (2) is... , which corresponds to the conversion coefficient from the effective value to the peak value of the AC voltage; 314 in formula (2) is 100π, which corresponds to the angular frequency of 50Hz AC.

[0075] Different detection time thresholds (T) correspond to different first voltage thresholds (Vth). In practical applications, to facilitate direct querying, a data table can be pre-set. This data table contains the correspondence between the detection time thresholds (T) and the first voltage thresholds (Vth). For example, one example of this data table is shown in Table 1.

[0076] Table 1:

[0077]

[0078] Regarding the above embodiments of the present invention Figure 1 The step S103, which involves determining whether the high-voltage safety circuit is faulty, is described in detail below. Figure 2 This document illustrates a flowchart for determining whether a high-voltage safety circuit is faulty, provided by an embodiment of the present invention. Figure 2 Includes the following steps:

[0079] Step S201: Determine the first accumulated count value by using the actual voltage value and the preset first voltage threshold, and count the duration of high level and low level by using the square wave signal.

[0080] In the specific implementation of step S201, the first accumulated count value (denoted as Cnt1) is determined by using the actual voltage value (Vin) and the first voltage threshold (Vth). The specific method of obtaining the first voltage threshold (Vth) has been described in detail in the above embodiments and will not be repeated here.

[0081] In some specific embodiments, the specific implementation of determining the first accumulated count value (Cnt1) is as follows: when the actual voltage value is less than the first voltage threshold (specifically when the absolute value of Vin is less than Vth), the counter is incremented during the interruption of the pulse width modulation carrier period (i.e. PWM carrier period) of the elevator inverter to obtain the first accumulated value (Cnt1).

[0082] When the actual voltage value is greater than the first voltage threshold, it indicates that the high voltage safety signal is within the normal range. The counter is then cleared to obtain the first accumulated value of 0 (Cnt1=0 at this time), and the next round of counter accumulation operation is restarted.

[0083] It should be noted that the square wave signal converted from the high-voltage safety signal consists of high-level signals (represented by 1) and low-level signals (represented by 0). In this square wave signal, when a transition from low to high level is detected, the corresponding input voltage changes from below 30V to above 30V; when a transition from high to low level is detected, the corresponding input voltage changes from above 20V to below 20V.

[0084] Since level detection has low requirements for timing response speed, a 1ms cycle main loop program is deployed in the elevator control system to judge the real-time status of the square wave signal, thereby statistically obtaining the duration of high level and low level. This can balance system resource usage and detection requirements.

[0085] Understandably, the hardware circuit employs a hysteresis comparator design, the core function of which is to avoid frequent level jumps caused by minor fluctuations in the input voltage, thereby improving detection stability. Therefore, the statistically calculated duration of the high-level and low-level signals is used as one of the criteria for determining whether the high-voltage safety circuit is faulty.

[0086] Step S202: Correct the first accumulated count value and calculate the product between the corrected first accumulated count value and the pulse width modulation carrier period of the elevator's frequency converter to obtain the actual accumulated time.

[0087] In the specific implementation of step S202, in order to reduce the false judgment rate of fault detection, after obtaining the first accumulated value (Cnt1), it is necessary to dynamically correct the first accumulated value (Cnt1).

[0088] In some specific embodiments, the correction of the first accumulated count value is implemented by calculating the difference between the actual voltage value (Vin) and the voltage reference value (denoted as VinABSBak) to obtain the first difference. If the first difference is greater than the second voltage threshold (e.g., 3V), it indicates that the input voltage is rising from a low level to a high level, and the time interval corresponding to the change process of the input voltage of the high-voltage safety circuit is converted into the second accumulated count value (denoted as Cnt2).

[0089] If the first accumulated count value is greater than the second accumulated count value (if Cnt1 is greater than Cnt2), calculate the difference between the first accumulated count value and the second accumulated count value to obtain the second difference value. Determine the second difference value as the corrected first accumulated count value, that is, the corrected Cnt1 = Cnt1 - Cnt2.

[0090] In some embodiments, it is necessary to update the voltage reference value (VinABSBak). Specifically, when the actual voltage value (Vin) is greater than the first voltage threshold (Vth), the voltage reference value (VinABSBak) is assigned the first voltage threshold (Vth) to update the voltage reference value, i.e., VinABSBak = Vth.

[0091] When the actual voltage value is less than the first voltage threshold, and when the actual voltage value is less than the voltage reference value, the voltage reference value is assigned to the actual voltage value to update the voltage reference value, i.e., VinABSBak = Vin.

[0092] If the first accumulated count value is less than or equal to the second accumulated count value, the first accumulated count value is set to 0 (Cnt1 is cleared), and the voltage reference value is set to the actual voltage value to update the voltage reference value, i.e., VinABSBak = Vin.

[0093] In practical applications, one example of updating the voltage reference value (VinABSBak) is to take the absolute value of the actual voltage value (Vin) obtained in the current sampling period and store it in the variable "VinABS".

[0094] When VinABS is greater than Vth, set VinABSBak = Vth.

[0095] When VinABS is less than Vth, if it is detected that VinABS is less than the current VinABSBak, then VinABSBak = VinABS.

[0096] If the difference between VinABS and VinABSBak (i.e., the first difference) is detected to be greater than 3V (the second voltage threshold), it indicates that the input voltage is rising from a low level to a high level. The time interval corresponding to the change process of the input voltage of the high-voltage safety circuit is converted into Cnt2. If Cnt1 is greater than Cnt2, then the corrected Cnt1 = Cnt1 - Cnt2, so that the corrected Cnt1 can be obtained. Otherwise, Cnt1 is cleared to zero, and VinABSBak is set to VinABS.

[0097] The above method can solve the problem of false counting caused by voltage fluctuations during the zero-crossing of sine and cosine signals, and reduce the false judgment rate of fault detection by dynamically correcting Cnt1.

[0098] After obtaining the corrected first accumulated count value, the product between the "corrected first accumulated count value" and the "pulse width modulation carrier period (PWM carrier period) of the elevator inverter" is calculated to obtain the actual accumulated time.

[0099] Step S203: If the actual cumulative time is greater than the preset detection time threshold, and / or if the duration of the low level is greater than the first duration threshold, a high-voltage safety circuit fault is determined.

[0100] In the specific implementation of step S203, if the actual cumulative time is greater than the preset detection time threshold (T), and / or if the duration of the low level is greater than the first duration threshold (e.g., 12ms), a high-voltage safety circuit fault is determined, that is, the high-voltage safety signal input is determined to be disconnected.

[0101] Step S204: If the actual cumulative time is less than the detection time threshold, and if the duration of the high level is greater than the second duration threshold, it is determined that the high-voltage safety circuit is fault-free.

[0102] In the specific implementation of step S204, if the actual cumulative time is less than the detection time threshold, and if the duration of the high level is greater than the second duration threshold (e.g., 8ms), it is determined that the high-voltage safety circuit is fault-free, that is, the high-voltage safety signal input is normal.

[0103] The above embodiments of the present invention Figure 2 This is an explanation of how to determine whether a high-voltage safety circuit is faulty.

[0104] In conjunction with the above embodiments of the present invention Figure 2 As can be seen from the content, this solution employs a comprehensive judgment mechanism combining analog and digital signal detection results to determine whether the high-voltage safety circuit is faulty. This comprehensive judgment mechanism requires either of the following two conditions to be met: "actual cumulative time is greater than the preset detection time threshold" or "low-level duration is greater than the first duration threshold". For the high-voltage safety circuit to be considered fault-free, both the "actual cumulative time is less than the detection time threshold" and "high-level duration is greater than the second duration threshold" conditions must be met simultaneously.

[0105] The aforementioned comprehensive judgment mechanism combines the advantages of rapid analog quantity detection and stable digital quantity detection, enabling comprehensive and accurate monitoring of the status of high-voltage safety circuits.

[0106] Corresponding to the detection method for a high-voltage safety circuit provided in the above embodiments of the present invention, see also... Figure 3 The present invention also provides a structural block diagram of a high-voltage safety circuit detection device, which is applicable to elevator control systems. The detection device includes: a sampling unit 301, a conversion unit 302, a judgment unit 303, and an alarm unit 304.

[0107] The sampling unit 301 is used to sample the high-voltage safety signal of the elevator's high-voltage safety circuit in real time.

[0108] The conversion unit 302 is used to convert the high-voltage safety signal into a first low-voltage signal and a square wave signal, and to convert the first low-voltage signal into an actual voltage value.

[0109] In a specific implementation, the process by which the conversion unit 302 converts the high-voltage safety signal into a first low-voltage signal and a square wave signal includes: converting the high-voltage safety signal into a first low-voltage signal through a voltage divider circuit and an isolation circuit; and converting the high-voltage safety signal into a square wave signal through a shaping circuit.

[0110] The judgment unit 303 is used to determine whether the high-voltage safety circuit is faulty by using the actual voltage value, square wave signal, preset first voltage threshold and preset detection time threshold.

[0111] Alarm unit 304 is used to trigger a fault alarm process if there is a fault in the high-voltage safety circuit.

[0112] In this embodiment of the invention, a dual verification mechanism of analog and digital quantities is used to detect faults in the high-voltage safety circuit of the elevator, ensuring the accuracy and timeliness of fault detection in the high-voltage safety circuit, thereby avoiding the risk of arcing in the operating contactor.

[0113] Preferred, combined Figure 3 The content shown indicates that the judgment unit 303 includes a first processing module, a second processing module, a first determination module, and a second determination module; the execution principle of each module is as follows:

[0114] The first processing module is used to determine the first accumulated count value by the actual voltage value and the preset first voltage threshold, and to count the duration of high level and low level by square wave signal.

[0115] In specific implementation, the process of the first processing module determining the first accumulated count value includes: when the actual voltage value is less than the first voltage threshold, performing an accumulation operation on the counter during the pulse width modulation carrier period interruption of the elevator's frequency converter to obtain the first accumulated value; when the actual voltage value is greater than the first voltage threshold, clearing the counter to obtain the first accumulated value assigned a value of 0.

[0116] The second processing module is used to correct the first accumulated count value and calculate the product between the corrected first accumulated count value and the pulse width modulation carrier period of the elevator's frequency converter to obtain the actual accumulated time.

[0117] In a specific implementation, the process of the second processing module correcting the first accumulated count value includes: calculating the difference between the actual voltage value and the voltage reference value to obtain a first difference; if the first difference is greater than a second voltage threshold, converting the time interval corresponding to the change process of the input voltage of the high-voltage safety circuit into a second accumulated count value; if the first accumulated count value is greater than the second accumulated count value, calculating the difference between the first accumulated count value and the second accumulated count value to obtain a second difference; and determining the second difference as the corrected first accumulated count value.

[0118] The first determining module is used to determine a high-voltage safety circuit fault if the actual cumulative time is greater than a preset detection time threshold, and / or if the duration of the low level is greater than a first duration threshold.

[0119] The second determining module is used to determine that the high-voltage safety circuit is fault-free if the actual cumulative time is less than the detection time threshold and if the duration of the high level is greater than the second duration threshold.

[0120] Preferably, in some embodiments, the determination unit 303 further includes a first update module, a second update module, and a third update module, and the execution principle of each module is as follows;

[0121] The first update module is used to update the voltage reference value by assigning the voltage reference value to the first voltage threshold when the actual voltage value is greater than the first voltage threshold.

[0122] The second update module is used to update the voltage reference value by assigning the voltage reference value to the actual voltage value when the actual voltage value is less than the first voltage threshold and when the actual voltage value is less than the voltage reference value.

[0123] The third update module is used to update the voltage reference value by setting the first accumulated count value to 0 and setting the voltage reference value to the actual voltage value if the first accumulated count value is less than or equal to the second accumulated count value.

[0124] Preferably, the present invention also provides a computer device, including: a processor and a memory, the processor and the memory being connected via a bus; wherein, the processor is used to call and execute a program stored in the memory; the memory is used to store the program, the program being used to implement the high-voltage safety circuit detection method provided in the above method embodiments.

[0125] Preferably, the present invention also provides a storage medium storing computer-executable instructions for executing the high-voltage safety circuit detection method provided in the above-described method embodiments.

[0126] In summary, the embodiments of the present invention provide a method, device, electronic device, and storage medium for detecting high-voltage safety circuits. A dual verification mechanism using analog and digital quantities is employed to detect faults in the high-voltage safety circuits of elevators, ensuring the accuracy and timeliness of fault detection and thus avoiding the risk of arcing in the operating contactor.

[0127] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described 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 modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0128] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0129] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of detecting a high pressure safety circuit, characterized in that, The method is applicable to elevator control systems, and the method includes: Real-time sampling of the high-voltage safety signal in the elevator's high-voltage safety circuit; The high-voltage safety signal is converted into a first low-voltage signal and a square wave signal, and the first low-voltage signal is converted into an actual voltage value. The fault status of the high-voltage safety circuit is determined by the actual voltage value, the square wave signal, the preset first voltage threshold, and the preset detection time threshold. If the high-voltage safety circuit fails, a fault alarm process is triggered. The determination of whether the high-voltage safety circuit is faulty, based on the actual voltage value, the square wave signal, a preset first voltage threshold, and a preset detection time threshold, includes: The first accumulated count value is determined by the actual voltage value and the preset first voltage threshold, and the duration of high level and duration of low level are counted by the square wave signal. The first accumulated count value is corrected, and the product between the corrected first accumulated count value and the pulse width modulation carrier period of the elevator's frequency converter is calculated to obtain the actual accumulated time. If the actual cumulative time is greater than the preset detection time threshold, and / or if the duration of the low level is greater than the first duration threshold, the high-voltage safety circuit is determined to be faulty. If the actual cumulative time is less than the detection time threshold, and if the duration of the high level is greater than the second duration threshold, the high-voltage safety circuit is determined to be fault-free. The process of determining the first accumulated count value by the actual voltage value and the preset first voltage threshold includes: When the actual voltage value is less than the first voltage threshold, the counter is incremented during the pulse width modulation carrier period interruption of the elevator's frequency converter to obtain the first accumulated count value. When the actual voltage value is greater than the first voltage threshold, the counter is cleared to obtain the first accumulated count value of 0.

2. The method of claim 1, wherein, The process of correcting the first accumulated count value includes: Calculate the difference between the actual voltage value and the voltage reference value to obtain a first difference; If the first difference is greater than the second voltage threshold, the time interval corresponding to the change process of the input voltage of the high-voltage safety circuit is converted into a second accumulated count value; If the first accumulated count value is greater than the second accumulated count value, calculate the difference between the first accumulated count value and the second accumulated count value to obtain the second difference value; The second difference is determined to be the corrected first accumulated count value.

3. The method of claim 2, wherein, Also includes: When the actual voltage value is greater than the first voltage threshold, the voltage reference value is assigned the first voltage threshold to update the voltage reference value; When the actual voltage value is less than the first voltage threshold, and when the actual voltage value is less than the voltage reference value, the voltage reference value is assigned to the actual voltage value to update the voltage reference value.

4. The method of claim 2, wherein, Also includes: If the first accumulated count value is less than or equal to the second accumulated count value, the first accumulated count value is set to 0, and the voltage reference value is set to the actual voltage value to update the voltage reference value.

5. The method of claim 1, wherein, The process of converting the high-voltage safety signal into a first low-voltage signal and a square wave signal includes: The high-voltage safety signal is converted into a first low-voltage signal through a voltage divider circuit and an isolation circuit; The high-voltage safety signal is converted into a square wave signal by a shaping circuit.

6. A detection device for a high-voltage safety circuit, characterized in that The device is used to implement the detection method for the high-voltage safety circuit according to any one of claims 1-5, the device is applicable to elevator control systems, and the device comprises: The sampling unit is used to sample the high-voltage safety signal of the elevator's high-voltage safety circuit in real time. The conversion unit is used to convert the high-voltage safety signal into a first low-voltage signal and a square wave signal, and to convert the first low-voltage signal into an actual voltage value. The judgment unit is used to determine whether the high-voltage safety circuit is faulty by using the actual voltage value, the square wave signal, the preset first voltage threshold and the preset detection time threshold. An alarm unit is used to trigger a fault alarm process if the high-voltage safety circuit fails.

7. A computer device, comprising: include: A processor and a memory are connected via a bus; wherein the processor is used to call and execute a program stored in the memory; The memory is used to store a program for implementing the high-voltage safety circuit detection method as described in any one of claims 1-5.

8. A storage medium, characterized by The storage medium stores computer-executable instructions for executing the detection method for a high-voltage safety circuit as described in any one of claims 1-5.

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