A method and system for ups maintenance and condition monitoring

Abstract

This invention relates to the field of UPS power supply technology, specifically to a UPS maintenance and status monitoring method and system. The method includes: when a preset maintenance cycle is reached, opening a controllable switch of the mains input circuit and monitoring the battery pack voltage; comparing the battery pack voltage with a preset discharge lower limit value, and based on the comparison result, closing the controllable switch of the mains input circuit to promptly switch back to mains power and charge the battery pack; monitoring the battery pack voltage and / or charging current, and determining to stop charging the battery pack based on the battery pack voltage and / or charging current; converting the battery maintenance data of the current maintenance cycle into a waveform graph, performing anomaly curve analysis on the waveform graph based on historical maintenance data, obtaining the battery pack status monitoring results, and realizing online monitoring of the battery's health status.

Description

Technical Field

[0001] This invention relates to the field of UPS power supply technology, and specifically to a UPS maintenance and status monitoring method and system. Background Technology

[0002] UPS (Uninterruptible Power Supply) plays a crucial role in the operation of automatic control and monitoring systems. It ensures the system continues to operate normally in the event of a power outage, prevents data loss, and protects the system's hardware and software. The battery pack, as a component of the UPS system, directly determines whether the UPS can function properly and provide power. Therefore, it is necessary to periodically charge and discharge the UPS to keep the batteries in a healthy state.

[0003] Currently, UPS systems are typically discharged manually, meaning the AC mains input is manually disconnected, allowing the UPS to output AC power through the battery pack. Once the battery pack has discharged to a certain extent, the AC mains input is manually restored. However, UPS systems are usually installed in equipment rooms that lack long-term operational conditions, making it inconvenient for maintenance personnel to monitor their operation nearby for extended periods. This can lead to the following technical problems during UPS discharge under load: failure to switch back to mains power promptly after discharge, resulting in the UPS battery being completely depleted and the UPS output losing power; and false charge levels due to battery issues (such as aging, damage, or memory effect), preventing normal AC output. Both of these situations affect the stability and reliability of the UPS system, causing sudden shutdowns of systems, equipment, and computers under load, impacting safe production, and potentially leading to significant economic losses. Therefore, there is an urgent need to research a method or system that can accurately and promptly switch back to mains power and monitor the battery's health status online. Summary of the Invention

[0004] This invention proposes a UPS maintenance and condition monitoring method and system, aiming to solve at least one of the technical problems existing in the prior art.

[0005] To achieve the above technical objectives, the present invention adopts the following technical solution: a UPS maintenance and status monitoring method, comprising the following steps: A preset maintenance cycle is set. When the preset maintenance cycle is reached, the controllable switch of the mains input circuit is disconnected, and the battery pack voltage is monitored. The battery pack voltage is compared with a preset discharge lower limit value. Based on the comparison result, the controllable switch of the mains input circuit is closed, and the battery pack is charged. Monitor the battery pack voltage and / or charging current, and determine to stop charging the battery pack based on the battery pack voltage and / or charging current; The data on battery pack charging and discharging during the current maintenance cycle is stored and recorded as battery maintenance data. Battery maintenance data is converted into waveforms, and anomaly curve analysis is performed on the waveforms based on historical maintenance data to obtain the battery pack status monitoring results.

[0006] This invention controls the disconnection of the controllable switch in the mains input circuit through a preset maintenance cycle and monitors and charges / discharges the battery pack voltage. Since the battery pack voltage directly reflects the battery's charging status and remaining capacity, monitoring the battery pack voltage and comparing it with a preset discharge lower limit allows for a more accurate assessment of the battery's remaining capacity. This enables more timely switching of the controllable switch in the mains input circuit, ensuring the normal operation of the load is not affected by false charge levels while effectively preventing UPS output power loss due to excessive battery discharge. This reduces manual intervention and ensures the stable operation of the UPS system. By converting the battery pack charging and discharging data into waveform graphs and performing anomaly curve analysis based on historical maintenance data, the invention visually displays the changing trends of battery maintenance data, allowing for a more accurate assessment of the battery pack's health status and reducing misjudgments caused by false charge levels.

[0007] Preferably, the battery pack voltage is compared with a preset discharge lower limit value, and based on the comparison result, a controllable switch of the mains input circuit is closed to charge the battery pack, including: Calculate the battery capacity of the battery pack and record it as the first battery capacity; Calculate the battery's usable time based on the first battery capacity and the battery pack's rated power; When the battery's usable time decreases to a preset value, the battery pack voltage is compared with a preset discharge lower limit value. Based on the comparison result, the controllable switch of the mains input circuit is closed, and the battery pack is charged.

[0008] Preferably, the battery's usable time is calculated based on the first battery capacity and the battery pack's rated power, including: The first battery capacity is divided by the rated power of the battery pack, and the resulting value is recorded as the battery's usable time.

[0009] Preferably, the calculation of battery availability time based on the first battery capacity and the rated power of the battery pack also includes: The actual battery capacity of the battery pack after degradation is calculated based on the first battery capacity and recorded as the second battery capacity. The second battery capacity is divided by the rated power of the battery pack, and the resulting value is recorded as the battery's usable time.

[0010] Preferably, the expression for calculating the actual battery capacity of the battery pack after degradation based on the first battery capacity is as follows: C2 = (V1 - V3) ÷ (V2 - V3) × C1 Where C2 represents the second battery capacity, V1 represents the battery pack voltage measured during the current charging and discharging process, V2 represents the rated voltage of the battery pack, V3 represents the battery pack voltage after the battery has actually degraded after a period of use, and C1 represents the first battery capacity.

[0011] Preferably, determining to stop charging the battery pack based on the battery pack voltage and / or charging current includes: When the battery pack voltage reaches the preset saturation voltage and the charging current is less than the preset current value, charging of the battery pack is stopped.

[0012] Preferably, battery maintenance data is converted into waveforms, and anomaly curve analysis is performed on the waveforms based on historical maintenance data to obtain the battery pack's condition monitoring results, including: Convert the battery maintenance data into a waveform graph, which is denoted as the first curve. The battery maintenance data waveform diagram based on historical maintenance data is denoted as the second curve. The abnormal range of battery maintenance data is preset. Based on the second curve, the upper limit waveform and the lower limit waveform of battery maintenance data are determined according to the preset abnormal range, and are respectively denoted as the third curve and the fourth curve. If the first curve is higher than the third curve or lower than the fourth curve, the battery pack status monitoring result is abnormal. If the first curve is not higher than the third curve or lower than the fourth curve, the battery pack status monitoring result is normal.

[0013] Preferably, the UPS maintenance and status monitoring method includes the following steps: A preset maintenance cycle is set. When the preset maintenance cycle is reached, the controllable switch of the mains input circuit is disconnected, and the UPS output voltage is monitored. The UPS output voltage is compared with a preset UPS voltage value. Based on the comparison result, the controllable switch of the mains input circuit is closed, and the battery pack is charged. Monitor the battery pack voltage and / or charging current, and determine to stop charging the battery pack based on the battery pack voltage and / or charging current; The data on battery pack charging and discharging during the current maintenance cycle is stored and recorded as battery maintenance data. Battery maintenance data is converted into waveforms, and anomaly curve analysis is performed on the waveforms based on historical maintenance data to obtain the battery pack status monitoring results.

[0014] A UPS maintenance and condition monitoring system, comprising: The discharge control module is used to preset the maintenance cycle. When the preset maintenance cycle is reached, it controls the controllable switch of the mains input circuit to disconnect. The data acquisition module is used to monitor the battery pack voltage and / or charging current; The charging control module compares the battery pack voltage with a preset discharge lower limit value, controls the controllable switch of the mains input circuit to close based on the comparison result, charges the battery pack, and determines to stop charging the battery pack based on the battery pack voltage and / or charging current. The data storage module is used to store the charging and discharging data of the battery pack during the current maintenance cycle, which is recorded as battery maintenance data. The condition monitoring module is used to convert battery maintenance data into waveforms, perform abnormal curve analysis on the waveforms based on historical maintenance data, and obtain the condition monitoring results of the battery pack.

[0015] Preferably, the data acquisition module is also used to monitor relevant electrical data of the UPS and mains power; The UPS maintenance and status monitoring system also includes an alarm module, which automatically issues an alarm when the status monitoring result of the battery pack is abnormal or when the data monitored by the data acquisition module exceeds a preset threshold.

[0016] The beneficial technical effects of this invention include at least the following: A UPS maintenance and status monitoring method and system is adopted. By controlling the disconnection of the controllable switch of the mains input circuit through a preset maintenance cycle, the battery pack voltage is monitored and charged / discharged. Since the battery pack voltage directly reflects the battery's charging status and remaining capacity, by monitoring the battery pack voltage and comparing it with a preset discharge lower limit, the remaining battery capacity can be more accurately determined. This allows for more timely switching of the controllable switch of the mains input circuit, ensuring that the normal operation of the load is not affected by false charge levels, effectively preventing UPS output power loss due to excessive battery discharge, reducing manual intervention, and ensuring the stable operation of the UPS system. By converting the battery pack charging and discharging data into waveform graphs and performing abnormal curve analysis on the waveform graphs based on historical maintenance data, the changing trend of battery maintenance data is intuitively displayed, allowing for more accurate judgment of the battery pack's health status and reducing misjudgments caused by false charge levels to a certain extent.

[0017] Other features and advantages of the present invention will be disclosed in detail in the following detailed description and accompanying drawings. Attached Figure Description

[0018] The invention will be further described below with reference to the accompanying drawings: Figure 1This is a flowchart of the UPS maintenance and status monitoring method according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of abnormal curve analysis in an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the UPS maintenance and condition monitoring system according to an embodiment of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0022] In the following description, terms such as “inner,” “outer,” “upper,” “lower,” “left,” and “right” are used only to indicate orientation or positional relationship for the convenience of describing the embodiments and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0023] This application provides a UPS maintenance and status monitoring method. Please refer to the appendix. Figure 1 This includes the following steps: Step 102: Preset maintenance cycle. When the preset maintenance cycle is reached, the controllable switch of the mains input circuit is disconnected, and the battery pack voltage is monitored.

[0024] For example, the preset maintenance cycle is 3 days. When the preset maintenance cycle is reached, the controllable switch of the mains input circuit is disconnected. In this way, the original two input voltages of the UPS (AC mains and battery pack) are only supplied by the battery pack. The DC voltage of the battery pack is provided to the load after being inverted by the UPS power supply, which continuously consumes the energy of the battery pack. This is equivalent to discharging the battery pack, replacing the previous operation of manually disconnecting the mains input power.

[0025] Step 104: Compare the battery pack voltage with the preset discharge lower limit value, control the controllable switch of the mains input circuit to close based on the comparison result, and charge the battery pack.

[0026] The lower discharge limit is the depth of discharge. In this embodiment, the preset lower discharge limit is based on the battery pack specifications, including capacity, rated voltage, charging and discharging characteristics, etc., and is reasonably set according to the actual load requirements of the application and the safety requirements of the battery pack, so that the preset lower discharge limit can meet the continuous power supply of the UPS system in emergency situations.

[0027] Specifically, the battery pack voltage is monitored in real time during the discharge process. When the battery pack voltage drops to the preset discharge lower limit, it is determined that the battery pack discharge has reached its limit. The controllable switch of the mains input circuit is immediately closed to restore the AC mains power supply to the UPS and start reversing the charging of the battery pack.

[0028] Step 106: Monitor the battery pack voltage and / or charging current, and determine to stop charging the battery pack based on the battery pack voltage and / or charging current. This completes a full UPS battery pack maintenance process.

[0029] It is understandable that monitoring the battery pack voltage and / or charging current, and determining to stop charging the battery pack based on the battery pack voltage and / or charging current, includes the following three situations: 1. Continue to monitor the battery pack voltage. When the battery pack voltage reaches the preset saturation voltage, stop charging the battery pack.

[0030] 2. Monitor the charging current. When the charging current is less than the preset current value, stop charging the battery pack.

[0031] 3. Continue to monitor the battery pack voltage and charging current. When the battery pack voltage reaches the preset saturation voltage and the charging current is less than the preset current value, stop charging the battery pack.

[0032] Step 108: Store the charging and discharging data of the battery pack during the current maintenance cycle, and record it as battery maintenance data; Step 110: Convert the battery maintenance data into a waveform graph, perform anomaly curve analysis on the waveform graph based on historical maintenance data, and obtain the battery pack status monitoring results.

[0033] Optionally, the method for obtaining the battery pack's condition monitoring results by analyzing the waveform based on historical maintenance data in this embodiment includes, but is not limited to, the following: 1. Threshold detection method: Set a threshold, and waveform data exceeding the threshold is identified as abnormal, and abnormal curve analysis is performed accordingly.

[0034] 2. Frequency Domain Analysis: Using frequency domain analysis methods such as Fourier transform, the waveform is converted to the frequency domain for analysis to identify abnormal frequency components, thereby assessing the battery pack status.

[0035] 3. Wavelet Transform: Wavelet transform can decompose a signal into components of different scales. It can be used to identify local abnormal changes in the waveform and monitor the status of the battery pack.

[0036] 4. Time-frequency analysis: such as short-time Fourier transform (STFT) or continuous wavelet transform (CWT), which considers both the time and frequency characteristics of the signal to detect abnormal changes in the waveform.

[0037] This embodiment controls the disconnection of the controllable switch of the mains input circuit through a preset maintenance cycle and monitors and charges / discharges the battery pack voltage. Since the battery pack voltage directly reflects the battery's charging status and remaining capacity, monitoring the battery pack voltage and comparing it with a preset discharge lower limit allows for a more accurate assessment of the battery's remaining capacity. This enables more timely switching of the controllable switch of the mains input circuit, effectively preventing UPS output power loss due to excessive battery discharge, reducing manual intervention, and ensuring the stable operation of the UPS system. Furthermore, when the battery has false charge levels caused by aging, the battery pack voltage will drop rapidly and the current will increase instantaneously after switching from mains power to battery power. Therefore, by monitoring the battery pack voltage and comparing it with the preset discharge lower limit, the UPS system can respond quickly and immediately switch back to mains power, ensuring that the normal operation of the load is not affected by false charge levels. At the same time, this embodiment converts the battery pack charging and discharging data into waveform graphs, intuitively displaying the changing trends of battery maintenance data. Based on historical maintenance data, abnormal curve analysis of the waveform graphs can more accurately determine the health status of the battery pack, reducing misjudgments caused by false charge levels to a certain extent.

[0038] In one embodiment of this specification, the battery pack voltage is compared with a preset discharge lower limit value, and based on the comparison result, a controllable switch of the mains input circuit is closed to charge the battery pack, including: Calculate the battery capacity of the battery pack and record it as the first battery capacity; Calculate the battery's usable time based on the first battery capacity and the battery pack's rated power; When the battery's usable time decreases to a preset value, the battery pack voltage is compared with a preset discharge lower limit value. Based on the comparison result, the controllable switch of the mains input circuit is closed, and the battery pack is charged.

[0039] In this embodiment, the methods for calculating the first battery capacity include, but are not limited to, the following: 1. Static discharge method: By connecting the battery pack to a known load, the time from full charge to complete discharge of the battery pack is recorded, and the capacity of the battery pack is calculated based on the relationship between current and time.

[0040] 2. Pulse discharge method: The internal resistance of the battery is measured by pulse discharge, and the capacity of the battery pack is calculated by combining the current and time of the discharge pulse.

[0041] 3. Calculation method: By mathematically modeling the discharge characteristics of the battery pack and combining parameters such as voltage, current, and temperature, the capacity of the battery pack is derived using mathematical calculation methods.

[0042] 4. Internal resistance method: By applying different currents to the battery pack and measuring the voltage change of the battery pack, the internal resistance of the battery is calculated according to Ohm's law, thereby indirectly deriving the capacity of the battery pack.

[0043] The rated power of the battery pack is usually specified by the battery manufacturer, and the common unit is watt (W). The battery usable time indicates the remaining time that the battery can maintain its discharge.

[0044] This embodiment first compares the battery's available time with a preset value, and then controls the closing of the controllable switch of the mains input circuit based on the comparison result of the battery pack voltage and the preset discharge lower limit value. This allows for more precise control of the switching of the mains input according to actual usage conditions, avoiding errors that may occur if the comparison is based solely on the battery pack voltage. Specifically, relying directly on the comparison of the battery pack voltage may be affected by factors such as battery internal resistance and temperature, resulting in errors. This avoids erroneous switching caused by voltage fluctuations, thereby avoiding the adverse effects of frequent charging or over-discharging on battery life, and helps improve the stability and reliability of the UPS system.

[0045] In one embodiment of this specification, calculating the battery's usable time based on the first battery capacity and the battery pack's rated power includes: The quotient of the first battery capacity and the rated power of the battery pack is recorded as the battery's usable time.

[0046] For example, the expression for calculating battery life in this embodiment is: T1 = C1 ÷ P Where T1 represents the battery's usable time, which can be in hours (H), C1 represents the battery capacity of the battery pack, i.e., the first battery capacitor, which can be in milliampere-hours (mAh), and P represents the rated power of the battery pack, which can be in watts (W).

[0047] It is understood that the battery usability time calculated in this embodiment is the battery usability time under normal circumstances, without considering battery degradation.

[0048] In one embodiment of this specification, calculating the battery's usable time based on the first battery capacity and the battery pack's rated power further includes: The actual battery capacity of the battery pack after degradation is calculated based on the first battery capacity and recorded as the second battery capacity. The quotient of the second battery capacity and the rated power of the battery pack is recorded as the battery's usable time.

[0049] As battery usage time increases, battery capacity gradually decreases, and the actual battery usable time decreases accordingly. Therefore, this embodiment takes into account the actual capacity after battery degradation and calculates the battery usable time accordingly, which is more in line with the actual performance characteristics of the battery pack, and thus enables more precise control over the switching of mains power input.

[0050] In one embodiment of this specification, the expression for calculating the actual degraded battery capacity of the battery pack based on the first battery capacity is as follows: C2 = (V1 - V3) ÷ (V2 - V3) × C1 Where C2 represents the actual battery capacity of the battery pack after degradation, i.e., the second battery capacity; V1 represents the battery pack voltage measured during the current charging and discharging process; V2 represents the rated voltage of the battery pack, i.e., the full-charge voltage of the battery pack set by the factory program; V3 represents the battery pack voltage after actual degradation after a period of battery use, i.e., the full-charge voltage of the battery pack after actual degradation; and C1 represents the battery capacity of the battery pack under normal conditions, i.e., the first battery capacity.

[0051] Where V3 = V2 × D, D represents the degradation rate. The degradation rate needs to be estimated based on the actual usage time and charging frequency of the battery. For example, it is normal for a new mobile phone battery to be charged more than 1,000 times. A mobile phone battery is generally considered to be usable when its capacity is greater than or equal to 80%. That is to say, the degradation rate reaches 80% after about 1,000 charge and discharge cycles.

[0052] In one embodiment of this specification, determining to stop charging the battery pack based on the battery pack voltage and / or charging current includes: When the battery pack voltage reaches the preset saturation voltage and the charging current is less than the preset current value, charging of the battery pack will stop.

[0053] This embodiment limits the charging of the battery pack to stopping only when the battery pack voltage reaches a preset saturation voltage and the charging current is less than a preset current value. Compared with stopping the charging of the battery pack only when the battery pack voltage reaches a preset saturation voltage or when the charging current is less than a preset current value, it can more accurately determine the charging status of the battery, avoid misjudgment under a single condition, more effectively protect the UPS battery pack, and avoid overcharging.

[0054] In one embodiment of this specification, battery maintenance data is converted into a waveform graph, and anomaly curve analysis is performed on the waveform graph based on historical maintenance data to obtain the battery pack status monitoring results, including: Convert the battery maintenance data into a waveform graph, which is denoted as the first curve. The battery maintenance data waveform diagram based on historical maintenance data is denoted as the second curve. The abnormal range of battery maintenance data is preset. Based on the second curve, the upper limit waveform and the lower limit waveform of battery maintenance data are determined according to the preset abnormal range, and are respectively denoted as the third curve and the fourth curve. If the first curve is higher than the third curve or lower than the fourth curve, the battery pack status monitoring result is abnormal. If the first curve is not higher than the third curve or lower than the fourth curve, the battery pack status monitoring result is normal.

[0055] For example, please refer to the appendix. Figure 2 The implementation method of this embodiment is as follows: Convert the battery pack's charge and discharge data during the current maintenance cycle into a waveform graph, denoted as the first curve (i.e., the attached curve). Figure 2 (Curve I in the middle) The battery maintenance data waveform diagram, determined based on historical maintenance data, is denoted as the second curve (i.e., attached). Figure 2 Curve II in the figure), wherein the specific implementation of determining the standard battery maintenance data waveform based on historical maintenance data may include: cleaning and preprocessing historical maintenance data, feature extraction, establishing a mathematical model (such as regression model, clustering model, time series model, etc. can be selected), using historical data for verification, and determining the standard battery maintenance data waveform based on the verified model. This waveform can reflect the typical characteristics and scope of battery maintenance data. Assuming the preset abnormal range for battery maintenance data is 10% above and below the standard curve (i.e., the second curve), then the upper limit waveform and the lower limit waveform of the abnormal battery maintenance data are determined and denoted as the third curve (i.e., the attached curve). Figure 2 Curve III and the fourth curve (i.e., the appendix) Figure 2 (Curve IV in the middle) If the voltage at a certain point in the actual charge / discharge curve (i.e., the first curve) exceeds the range of these two "envelopes" (i.e., the third and fourth curves), then we consider that the health status of the battery pack corresponding to this actual charge / discharge curve is abnormal. Figure 2 If two points on the first curve exceed the third curve, then the state monitoring result of the battery pack corresponding to the first curve is abnormal.

[0056] The preset range of abnormal battery maintenance data can be set according to the actual load conditions.

[0057] This embodiment uses the visualization of multiple waveforms to intuitively compare the trends of battery maintenance data. At the same time, it determines the third and fourth curves based on the first curve and the preset abnormal range, and automatically judges the monitoring results of the battery pack status according to the relationship between these curves. This can improve the efficiency of battery pack status monitoring, thereby enabling more timely early warning and maintenance, reducing the subjectivity of human judgment, and making the abnormal analysis of battery maintenance data more accurate.

[0058] In one embodiment of this specification, a UPS maintenance and status monitoring method includes the following steps: A preset maintenance cycle is set. When the preset maintenance cycle is reached, the controllable switch of the mains input circuit is disconnected, and the UPS output voltage is monitored. The UPS output voltage is compared with the preset UPS voltage value. Based on the comparison result, the controllable switch of the mains input circuit is closed, and the battery pack is charged. Monitor the battery pack voltage and / or charging current, and determine to stop charging the battery pack based on the battery pack voltage and / or charging current; The data on battery pack charging and discharging during the current maintenance cycle is stored and recorded as battery maintenance data. Battery maintenance data is converted into waveforms, and anomaly curve analysis is performed on the waveforms based on historical maintenance data to obtain the battery pack's condition monitoring results.

[0059] This embodiment is compared to the appendix Figure 1 The corresponding embodiment differs in that it uses the UPS output voltage as the criterion for determining the closing of the controllable switch in the mains input circuit. Since changes in the UPS output voltage directly reflect the status of the mains input, the controllable switch closing operation of the mains input circuit can be performed relatively promptly. This ensures that the UPS system can effectively restore AC mains power supply when the UPS output changes. Furthermore, by monitoring the UPS output voltage and controlling the controllable switch of the mains input circuit, the stability of the UPS output and the load conditions can be considered more comprehensively, resulting in more flexible control of the mains input circuit. The technical solution proposed in this embodiment helps improve the stability and reliability of the UPS system under complex power grid environments and load fluctuations.

[0060] On the other hand, this application also provides a UPS maintenance and condition monitoring system similar to the aforementioned UPS maintenance and condition monitoring method concept. Please refer to the appendix. Figure 3 ,include: The discharge control module 1 is used to preset the maintenance cycle. When the preset maintenance cycle is reached, it controls the controllable switch of the mains input circuit to disconnect. Data acquisition module 2 is used to monitor battery pack voltage and / or charging current; The charging control module 3 compares the battery pack voltage with a preset discharge lower limit value, controls the controllable switch of the mains input circuit to close based on the comparison result, charges the battery pack, and determines to stop charging the battery pack based on the battery pack voltage and / or charging current. Data storage module 4 is used to store the charging and discharging data of the battery pack during the current maintenance cycle, which is recorded as battery maintenance data; The condition monitoring module 5 is used to convert battery maintenance data into waveforms, perform abnormal curve analysis on the waveforms based on historical maintenance data, and obtain the condition monitoring results of the battery pack.

[0061] For example, in this embodiment, the data acquisition module 2 can be a battery current / voltage measurement circuit, the discharge control module 1, the charging control module 3 and the data storage module 4 can all be a main controller, such as an STM32 series high-performance ARM processor, the status monitoring module 5 can be an industrial computer or software in the industrial computer to perform abnormal curve analysis on the waveform and display it on the touch screen in real time, the data acquisition module 2 is connected to the main controller, the main controller is connected to the controllable switch of the mains power input circuit, and the main controller is communicatively connected to the status monitoring module 5.

[0062] In one embodiment of this specification, the data acquisition module 2 is also used to monitor the relevant electrical data of the UPS and the mains power, including but not limited to the UPS output voltage, output current, output frequency, and mains input voltage, input current, input frequency, and input power; The UPS maintenance and status monitoring system also includes an alarm module, which automatically issues an alarm when the battery pack status monitoring result is abnormal or when the data monitored by the data acquisition module 2 exceeds a preset threshold.

[0063] Optionally, the alarm module can use a buzzer alarm or a screen interface alarm.

[0064] The above description is merely a preferred embodiment disclosed in this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of protection involved in this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-disclosed concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this disclosure.

[0065] Furthermore, while the operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential order. In certain environments, multitasking and parallel processing may be advantageous. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this disclosure. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

Claims

1. A UPS maintenance and condition monitoring method, characterized in that, Includes the following steps: A preset maintenance cycle is set. When the preset maintenance cycle is reached, the controllable switch of the mains input circuit is disconnected, and the battery pack voltage is monitored. The battery pack voltage is compared with a preset discharge lower limit value. Based on the comparison result, the controllable switch of the mains input circuit is closed, and the battery pack is charged. Monitor the battery pack voltage and / or charging current, and determine to stop charging the battery pack based on the battery pack voltage and / or charging current; The data on battery pack charging and discharging during the current maintenance cycle is stored and recorded as battery maintenance data. Battery maintenance data is converted into waveforms, and anomaly curve analysis is performed on the waveforms based on historical maintenance data to obtain the battery pack status monitoring results. The process includes comparing the battery pack voltage with a preset discharge lower limit, controlling the closing of a controllable switch in the mains input circuit based on the comparison result, and charging the battery pack. Calculate the battery capacity of the battery pack and denote it as the first battery capacity; Calculate the battery's usable time based on the first battery capacity and the battery pack's rated power; When the battery's usable time decreases to a preset value, the battery pack voltage is compared with a preset discharge lower limit value. Based on the comparison result, the controllable switch of the mains input circuit is closed, and the battery pack is charged. This process involves converting battery maintenance data into waveforms, performing anomaly analysis on the waveforms based on historical maintenance data, and obtaining the battery pack's condition monitoring results, including: Convert the battery maintenance data into a waveform graph, which is denoted as the first curve. The battery maintenance data waveform diagram based on historical maintenance data is denoted as the second curve. The abnormal range of battery maintenance data is preset. Based on the second curve, the upper limit waveform and the lower limit waveform of battery maintenance data are determined according to the preset abnormal range, and are respectively denoted as the third curve and the fourth curve. If the first curve is higher than the third curve or lower than the fourth curve, the battery pack status monitoring result is abnormal. If the first curve is not higher than the third curve or lower than the fourth curve, the battery pack status monitoring result is normal.

2. The UPS maintenance and status monitoring method as described in claim 1, characterized in that, The battery's usable time is calculated based on the first battery capacity and the battery pack's rated power, including: The first battery capacity is divided by the rated power of the battery pack, and the resulting value is recorded as the battery's usable time.

3. The UPS maintenance and status monitoring method as described in claim 1, characterized in that, The calculation of battery availability time based on the first battery capacity and the rated power of the battery pack also includes: The actual battery capacity of the battery pack after degradation is calculated based on the first battery capacity and recorded as the second battery capacity. The second battery capacity is divided by the rated power of the battery pack, and the resulting value is recorded as the battery's usable time.

4. The UPS maintenance and status monitoring method as described in claim 3, characterized in that, The expression for calculating the actual battery capacity of the battery pack after degradation based on the first battery capacity is as follows: C2 = (V1 - V3) ÷ (V2 - V3) × C1 Where C2 represents the second battery capacity, V1 represents the battery pack voltage measured during the current charging and discharging process, V2 represents the rated voltage of the battery pack, V3 represents the battery pack voltage after the battery has actually degraded after a period of use, and C1 represents the first battery capacity.

5. The UPS maintenance and status monitoring method as described in claim 1, characterized in that, Determining to stop charging the battery pack based on the battery pack voltage and / or charging current includes: When the battery pack voltage reaches the preset saturation voltage and the charging current is less than the preset current value, charging of the battery pack is stopped.

6. The UPS maintenance and status monitoring method as described in claim 1, characterized in that, Includes the following steps: A preset maintenance cycle is set. When the preset maintenance cycle is reached, the controllable switch of the mains input circuit is disconnected, and the UPS output voltage is monitored. The UPS output voltage is compared with a preset UPS voltage value. Based on the comparison result, the controllable switch of the mains input circuit is closed, and the battery pack is charged.

7. A UPS maintenance and condition monitoring system, characterized in that, include: The discharge control module is used to preset the maintenance cycle. When the preset maintenance cycle is reached, it controls the controllable switch of the mains input circuit to disconnect. The data acquisition module is used to monitor the battery pack voltage and / or charging current; The charging control module compares the battery pack voltage with a preset discharge lower limit value, controls the controllable switch of the mains input circuit to close based on the comparison result, charges the battery pack, and determines to stop charging the battery pack based on the battery pack voltage and / or charging current. The data storage module is used to store the charging and discharging data of the battery pack during the current maintenance cycle, which is recorded as battery maintenance data. The condition monitoring module is used to convert battery maintenance data into waveforms, perform abnormal curve analysis on the waveforms based on historical maintenance data, and obtain the condition monitoring results of the battery pack. The charging control module is used to perform the following steps: Calculate the battery capacity of the battery pack and denote it as the first battery capacity; Calculate the battery's usable time based on the first battery capacity and the battery pack's rated power; When the battery's usable time decreases to a preset value, the battery pack voltage is compared with a preset discharge lower limit value. Based on the comparison result, the controllable switch of the mains input circuit is closed, and the battery pack is charged. The status monitoring module is used to perform the following steps: Convert the battery maintenance data into a waveform graph, which is denoted as the first curve. The battery maintenance data waveform diagram based on historical maintenance data is denoted as the second curve. The abnormal range of battery maintenance data is preset. Based on the second curve, the upper limit waveform and the lower limit waveform of battery maintenance data are determined according to the preset abnormal range, and are respectively denoted as the third curve and the fourth curve. If the first curve is higher than the third curve or lower than the fourth curve, the battery pack status monitoring result is abnormal. If the first curve is not higher than the third curve or lower than the fourth curve, the battery pack status monitoring result is normal.

8. The UPS maintenance and status monitoring system as described in claim 7, characterized in that, The data acquisition module is also used to monitor relevant electrical data of the UPS and mains power. The UPS maintenance and status monitoring system also includes an alarm module, which automatically issues an alarm when the status monitoring result of the battery pack is abnormal or when the data monitored by the data acquisition module exceeds a preset threshold.

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