Charging system of electrical automation equipment

Abstract

The invention relates to the technical field of charging control of electrical automation equipment, in particular to a charging system of the electrical automation equipment, which comprises a storage battery module. The data acquisition module comprises a timer, a voltage sensor, an electric quantity determination assembly and a temperature sensor; the charging control module is used for analyzing the input voltage to determine single-time voltage fluctuation and fluctuation frequency so as to determine whether the stability of the input voltage is qualified or not, and is used for determining whether the residual electric quantity is corrected or not based on the open-circuit voltage so as to determine a switching sequence, a charging sequence and a preset charging duration of each standby battery based on the residual electric quantity; whether the preset charging duration is corrected or not is determined based on the charging temperature, and an alarm is given under the condition that the actual charging duration is greater than the preset charging duration; and switching to the storage battery module based on the unqualified input voltage, and controlling each standby battery based on the switching sequence and the charging sequence. The working efficiency of the electrical automation equipment is improved, and the service life of the electrical automation equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of charging control of electrical automation equipment, and in particular to a charging system for electrical automation equipment. Background Art

[0002] For example, some electrical automation equipment in new energy vehicles, machine tools, robots and PLC controllers have high requirements for voltage stability. Voltage stability is crucial to equipment safety and equipment operation accuracy, and voltage stability also directly affects the equipment's operating efficiency and performance. For example, charging piles can ensure voltage stability during the charging process through the steady-state DC charging technology, thereby improving charging efficiency and safety. Secondly, voltage stability is also closely related to the long-term operating cost and maintenance cost of the equipment. Unstable voltage may cause equipment overload, overheating and failure, increasing maintenance costs, while precise voltage control can extend the service life of the equipment and reduce maintenance costs.

[0003] With the continuous development of electrical automation equipment, the requirements for voltage stability are also increasing. This requires us to continuously optimize control algorithms, improve system design, and make full use of modern sensor technology and artificial intelligence technology during the design, manufacturing and use of the equipment's charging system to achieve real-time monitoring and control of voltage stability.

[0004] Chinese Patent Publication No.: CN102570566A discloses a charger system, which belongs to power electronics and power automation equipment, and is suitable for electric vehicle charging occasions, solving the problem of low efficiency of existing two-stage charger equipment. The invention includes a high-frequency rectifier, a high-frequency DC transformer and a controller. The high-frequency rectifier and the high-frequency DC transformer are connected through a DC bus. The controller generates the first to sixth drive signals and sends them to the high-frequency rectifier. The controller generates the seventh and eighth drive signals and sends them to the high-frequency DC transformer. The controller includes a sampling and conditioning module, a double closed-loop control module, a first signal generation module and a second signal generation module. The invention has the characteristics of high power factor and low current harmonics of the high-frequency rectifier and the characteristics of high efficiency and electrical isolation of the high-frequency DC transformer. It can realize two working modes of constant current charging and constant voltage charging of energy storage batteries and power batteries, and is suitable for electric vehicle charging systems.

[0005] It can be seen that the charger system has the following problems: although the invention realizes two working modes of constant current charging and constant voltage charging of energy storage batteries and power batteries by setting high-frequency rectifiers, high-frequency DC transformers and controllers, the invention lacks monitoring of the stability of the input voltage of the charger system, and cannot guarantee the working efficiency of the charging system, resulting in a short service life of the charging system. Summary of the invention

[0006] To this end, the present invention provides a charging system for electrical automation equipment, so as to overcome the problem in the prior art that the stability of the input voltage of the equipment is not monitored, resulting in low working efficiency and short service life of the equipment.

[0007] To achieve the above object, the present invention provides a charging system for electrical automation equipment, comprising:

[0008] A battery module, which includes a number of backup batteries arranged in the electrical automation equipment;

[0009] A data acquisition module, comprising a timer, a voltage sensor for monitoring the input voltage of the electrical automation equipment, a power determination component for monitoring the remaining power of each of the backup batteries, and a temperature sensor for monitoring the charging temperature and the power supply temperature of each of the backup batteries, wherein the power determination component comprises a multimeter for detecting the open circuit voltage of each of the backup batteries;

[0010] A charging control module, which is connected to the battery module and the data acquisition module respectively, includes:

[0011] a charging analysis unit, configured to analyze the input voltage to determine a single voltage fluctuation and a fluctuation frequency, so as to determine whether the stability of the input voltage is qualified, to determine whether to correct the remaining power based on the open circuit voltage, to determine a switching sequence, a charging sequence and a preset charging time of each backup battery based on the remaining power, to determine whether to correct the preset charging time based on the charging temperature, and to issue an alarm if the actual charging time is longer than the preset charging time;

[0012] A charging control unit, responsive to the analysis result of the charging analysis unit, controls the power supply to switch to the battery module based on the unqualified input voltage, and controls each of the backup batteries based on the switching sequence and the charging sequence.

[0013] Furthermore, the charging analysis unit records a voltage fluctuation in which the input voltage is greater than a first preset voltage or less than a second preset voltage as a single voltage fluctuation.

[0014] Furthermore, the charging analysis unit counts the number of single voltage fluctuations within a preset period to determine the fluctuation frequency, and determines that the stability of the input voltage is unqualified based on a comparison result that the fluctuation frequency is greater than the preset frequency.

[0015] Furthermore, when the stability of the input voltage is unqualified, the charging analysis unit determines the switching order of the backup batteries based on the remaining power of each battery collected by the data acquisition module in descending order, and controls the charging control unit to switch to the backup battery with the largest remaining power.

[0016] Further, the charging analysis unit controls the charging control unit to switch to the next backup battery based on a comparison result that the power supply temperature of the backup battery is greater than a first preset temperature.

[0017] Furthermore, the charging analysis unit detects the open circuit voltage of the corresponding backup battery under the condition that the remaining power of each battery collected by the data acquisition module is less than a preset power, and determines to correct the remaining power based on the comparison result that the open circuit voltage is less than the preset voltage, so as to calculate the preset charging time based on the remaining power and determine the charging order in ascending order.

[0018] Further, the charging analysis unit subtracts the open circuit voltage from the preset voltage to obtain a voltage difference, and determines to reduce the remaining power by a first power correction coefficient based on a comparison result that the voltage difference is greater than the preset voltage difference;

[0019] Based on the comparison result that the voltage difference is less than or equal to the preset voltage difference, it is determined to reduce the remaining power by a second power correction coefficient.

[0020] Furthermore, the charging analysis unit determines to correct the preset charging time based on a comparison result that the charging temperature is greater than a second preset temperature.

[0021] Further, the charging analysis unit subtracts the charging temperature from the second preset temperature to obtain a temperature difference, and determines to correct the preset charging duration by a first duration adjustment coefficient based on a comparison result that the temperature difference is greater than a preset difference value;

[0022] Based on the comparison result that the temperature difference is less than or equal to the preset difference value, it is determined to correct the preset charging time by using a second time adjustment coefficient.

[0023] Furthermore, the charging analysis unit issues an alarm based on a comparison result that the actual charging time is greater than the preset charging time.

[0024] Compared with the prior art, the beneficial effect of the present invention lies in that the present invention monitors the input voltage of the electrical automation equipment, determines to switch the power supply to the battery module to provide a stable voltage for the electrical automation equipment when the stability of the input voltage is unqualified, determines the power supply sequence and the charging sequence according to the remaining power of each backup battery when the battery module is used to power the equipment, switches to the backup battery of the next sequence to supply power when the temperature of the backup battery being powered is higher than the first preset temperature, charges the backup battery whose power does not reach the storage power threshold, and determines that the backup battery has a virtual power phenomenon when the remaining power of the backup battery is less than the preset power, detects its open circuit voltage, the lower the open circuit voltage, the more serious the virtual power situation is, and the less the actual power is, corrects the remaining power according to the open circuit voltage, and charges in ascending order according to the corrected remaining power and calculates the preset charging time, corrects the preset charging time according to the temperature during charging, and determines whether to issue an alarm based on the comparison result between the actual charging time and the preset charging time, thereby improving the stability of the input voltage of the electrical automation equipment, further improving the working efficiency of the equipment, and extending the service life of the equipment.

[0025] Furthermore, the present invention monitors the input voltage of the device to determine whether to switch to the battery module. The larger or smaller the input voltage, the larger the voltage fluctuation amplitude, and the larger the fluctuation frequency, the more unstable the input voltage. Unstable input voltage will cause current fluctuations in the device, resulting in reduced device performance, increased equipment wear, and thus reduced device service life. Therefore, monitoring the input voltage of the device helps to improve the stability of the input voltage of the electrical automation equipment, thereby improving the working efficiency of the equipment and extending the service life of the equipment.

[0026] Furthermore, the present invention determines the power supply sequence and charging sequence according to the remaining power of each backup battery when using the battery module to power the equipment, preferentially uses the backup battery with more remaining power for power supply, and starts charging from the backup battery with the least remaining power, thereby avoiding the situation where a backup battery is charged and discharged at the same time; when the temperature of the battery currently supplying power is higher than the first preset temperature, it switches to the backup battery in the next sequence. If the operating temperature of the battery is too high, the chemical reaction inside the battery will become more intense, thereby reducing the energy conversion efficiency of the battery. In order to maintain the same output power, the battery needs to consume more electrical energy, resulting in increased power consumption and reduced power supply efficiency. At the same time, the heating of the battery will accelerate the aging process of the battery, further reducing the battery's endurance and service life. Charging and discharging the battery at the same time will aggravate the temperature increase. By monitoring the power supply temperature of the backup battery and setting multiple backup batteries for switching, the service life of the backup battery is extended while ensuring the power supply efficiency, thereby improving the working efficiency of the equipment and extending the service life of the equipment.

[0027] Furthermore, the present invention determines a preset charging time for the backup battery being charged according to the remaining power, and corrects the preset charging time according to the charging temperature. High temperature will make the electrolyte inside the battery unstable, thereby reducing the migration rate of ions and the charging speed of the battery. If the actual charging time is longer than the preset charging time, it means that the battery is seriously aged and cannot stably provide sufficient power for the equipment. Therefore, an alarm needs to be issued for replacement reminder, so as to improve the stability of the input voltage of the electrical automation equipment, further improve the working efficiency of the equipment, and extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural block diagram of a charging system for an electrical automation device according to an embodiment of the present invention;

[0029] Figure 2 A flow chart for determining a single voltage fluctuation according to an embodiment of the present invention;

[0030] Figure 3 A flow chart for determining the eligibility of input voltage stability according to an embodiment of the present invention;

[0031] Figure 4 This is a flow chart of correcting the preset charging time according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0034] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0035] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] See also Figure 1 - Figure 4 As shown, Figure 1 It is a structural block diagram of a charging system for an electrical automation device according to an embodiment of the present invention; Figure 2 A flow chart for determining a single voltage fluctuation according to an embodiment of the present invention; Figure 3 A flow chart for determining the eligibility of input voltage stability according to an embodiment of the present invention; Figure 4 This is a flow chart of correcting the preset charging time according to an embodiment of the present invention.

[0037] An embodiment of the present invention provides a charging system for an electrical automation device, comprising:

[0038] A battery module, which includes a number of backup batteries arranged in the electrical automation equipment;

[0039] A data acquisition module, comprising a timer, a voltage sensor for monitoring the input voltage of the electrical automation equipment, a power determination component for monitoring the remaining power of each of the backup batteries, and a temperature sensor for monitoring the charging temperature and the power supply temperature of each of the backup batteries, wherein the power determination component comprises a multimeter for detecting the open circuit voltage of each of the backup batteries;

[0040] A charging control module, which is connected to the battery module and the data acquisition module respectively, includes:

[0041] a charging analysis unit, configured to analyze the input voltage to determine a single voltage fluctuation and a fluctuation frequency, so as to determine whether the stability of the input voltage is qualified, to determine whether to correct the remaining power based on the open circuit voltage, to determine a switching sequence, a charging sequence and a preset charging time of each backup battery based on the remaining power, to determine whether to correct the preset charging time based on the charging temperature, and to issue an alarm if the actual charging time is longer than the preset charging time;

[0042] A charging control unit, responsive to the analysis result of the charging analysis unit, controls the power supply to switch to the battery module based on the unqualified input voltage, and controls each of the backup batteries based on the switching sequence and the charging sequence.

[0043] Specifically, the number of backup batteries in the battery module can be set according to the power of the electrical automation equipment, and is not specifically limited. In the embodiment of the present invention, three backup batteries are selected and numbered as battery No. 1, battery No. 2, and battery No. 3.

[0044] Specifically, there is no limitation on the specific models of the timer, voltage sensor and temperature sensor, as long as they meet the usage requirements; the power determination components include but are not limited to power meter chips, battery management integrated circuits, current sensors and multimeters, and there is no limitation on the specific models, as long as the remaining power of the battery can be obtained in real time.

[0045] Specifically, the present invention monitors the input voltage of the electrical automation equipment, determines to switch the power supply to the battery module to provide a stable voltage for the electrical automation equipment under the condition that the stability of the input voltage is unqualified, determines the power supply sequence and the charging sequence according to the remaining power of each backup battery when the battery module is used to power the equipment, switches to the backup battery of the next sequence for power supply when the temperature of the backup battery currently supplying power is higher than the first preset temperature, charges the backup battery whose power does not reach the storage power threshold, and determines that the backup battery has a virtual power phenomenon when the remaining power of the backup battery is less than the preset power, detects its open circuit voltage, the lower the open circuit voltage, the more serious the virtual power situation is, and the less the actual power is, corrects the remaining power according to the open circuit voltage, and charges in ascending order according to the corrected remaining power and calculates the preset charging time, corrects the preset charging time according to the temperature during charging, and determines whether to issue an alarm based on the comparison result between the actual charging time and the preset charging time, thereby improving the stability of the input voltage of the electrical automation equipment, further improving the working efficiency of the equipment, and extending the service life of the equipment.

[0046] Specifically, the charging analysis unit records the voltage fluctuation of the input voltage greater than the first preset voltage or less than the second preset voltage as a single voltage fluctuation;

[0047] The charging analysis unit does not count the voltage fluctuation of the input voltage that is less than or equal to the first preset voltage and greater than or equal to the second preset voltage.

[0048] Specifically, the values ​​of the first preset voltage and the second preset voltage are determined according to the input rated voltage of the electrical automation equipment. The value of the second preset voltage is: rated voltage × 90%, and the value of the first preset voltage is: rated voltage × 110%. For example, when the rated voltage is 220V, the value of the second preset voltage is 220V × 90% = 198V, and the value of the first preset voltage is 220V × 110% = 242V.

[0049] Specifically, the greater the voltage fluctuation, the greater the impact on device performance. When it exceeds the preset value, it will seriously affect device performance and cause equipment operation errors, which need to be recorded.

[0050] Specifically, the charging analysis unit counts the number of single voltage fluctuations within a preset period to determine the fluctuation frequency, and determines that the input voltage is unqualified based on a comparison result that the fluctuation frequency is greater than the preset frequency;

[0051] The input voltage is determined to be unqualified based on a comparison result that the fluctuation frequency is less than or equal to the preset frequency.

[0052] Specifically, the preset period is set to 2 hours, and the value range of the preset frequency is set to [5 times / h, 10 times / h]. The preferred value in the embodiment of the present invention is 7 times / h.

[0053] Specifically, the greater the fluctuation frequency of the input voltage, the more unstable the voltage is, which may cause irreversible damage to the equipment. Therefore, when the voltage fluctuation frequency is large, the battery module is switched to provide a stable voltage for the equipment.

[0054] Specifically, under the condition that the input voltage is unqualified, the charging analysis unit determines the switching order of the backup batteries based on the remaining power of each battery collected by the data acquisition module in descending order, and controls the charging control unit to switch to the backup battery with the largest remaining power.

[0055] Specifically, the charging analysis unit arranges the remaining power of each backup battery in descending order. For example, if the remaining power of battery No. 1 is 85%, the remaining power of battery No. 2 is 92%, and the remaining power of battery No. 3 is 70%, then the charging analysis unit prioritizes controlling battery No. 2 to power the device, and the switching order of the backup batteries is battery No. 2-battery No. 1-battery No. 3.

[0056] Specifically, the more remaining power the backup battery has, the longer it can provide a stable voltage. When using the battery module to supply power, the backup battery with the most remaining power is given priority, avoiding the possibility of device performance degradation caused by frequent power switching due to insufficient battery power.

[0057] Specifically, the charging analysis unit controls the charging control unit to switch to the next backup battery based on the comparison result that the power supply temperature of the backup battery is greater than the first preset temperature;

[0058] The charging analysis unit controls the charging control unit to continue to use the current backup battery for power supply based on the comparison result that the power supply temperature of the backup battery is less than or equal to the first preset temperature until the temperature of the backup battery is greater than the first preset temperature.

[0059] Specifically, the value range of the first preset temperature is set to [45° C., 65° C.], and 50° C. is preferred in the embodiment of the present invention.

[0060] It is understandable that a battery's operating temperature that is too high will cause the chemical reaction inside the battery to become more intense, thereby reducing the battery's energy conversion efficiency. In order to maintain the same output power, the battery needs to consume more electrical energy, resulting in increased power consumption and reduced power supply efficiency. At the same time, battery heating will also accelerate the battery aging process, further reducing the battery's endurance and service life. Therefore, when the battery temperature is too high, switch to the next backup battery to cool down the overheated backup battery, thereby improving the power supply efficiency of the backup battery and extending the service life of the backup battery.

[0061] Specifically, under the condition that the remaining power of each battery collected by the data acquisition module is less than a preset power, the charging analysis unit detects the open circuit voltage of the corresponding backup battery, and determines to correct the remaining power based on the comparison result that the open circuit voltage is less than the preset voltage, so as to calculate the preset charging time based on the remaining power and determine the charging order in ascending order.

[0062] Specifically, the value range of the preset power is set to [15%, 30%], and 20% is preferred in the embodiment of the present invention; the value of the preset voltage is determined according to the rated working voltage of the backup battery. For example, for a backup battery with a rated working voltage of 12V, the preset voltage can be set to 12.5V. It can be understood that the open circuit voltage refers to the voltage of the battery when it is not connected to an external circuit or load, which will be higher than the rated working voltage.

[0063] Specifically, the charging analysis unit subtracts the open circuit voltage from the preset voltage to obtain a voltage difference, and determines to reduce the remaining power by a first power correction coefficient based on a comparison result that the voltage difference is greater than the preset voltage difference;

[0064] Based on the comparison result that the voltage difference is less than or equal to the preset voltage difference, it is determined to reduce the remaining power by a second power correction coefficient.

[0065] Specifically, the value range of the preset voltage difference is set to [0.5V, 2V], and 1.5V is preferably used in the embodiment of the present invention; the value range of the first power correction coefficient is set to [0.5, 0.7], and 0.6 is preferably used in the embodiment of the present invention; the value range of the second power correction coefficient is set to (0.7, 0.9], and 0.8 is preferably used in the embodiment of the present invention.

[0066] Specifically, the charging analysis unit arranges the remaining power of each backup battery in ascending order. For example, if the remaining power of battery No. 1 is 30%, the remaining power of battery No. 2 is 15%, and the remaining power of battery No. 3 is 20%, the charging analysis unit will give priority to charging battery No. 2. The charging order of the backup batteries is battery No. 2-battery No. 3-battery No. 1. The charging order and the power supply switching order are performed in reverse order, which avoids charging the same backup battery while supplying power. Charging and discharging at the same time will aggravate the temperature increase of the battery and accelerate battery aging.

[0067] Specifically, the preset charging time is determined according to the remaining power of the backup battery and the charging current:

[0068] When the charging current is less than or equal to 5% of the battery capacity, the preset charging time = (battery capacity - remaining power (mAh)) × 1.6 ÷ charging current (mA).

[0069] When the charging current is greater than 5% and less than or equal to 10% of the battery capacity, the preset charging time = (battery capacity - remaining power (mAh)) × 1.5 ÷ charging current (mA).

[0070] When the charging current is greater than 10% and less than or equal to 15% of the battery capacity, the preset charging time = (battery capacity - remaining power (mAh)) × 1.3 ÷ charging current (mA).

[0071] When the charging current is greater than 15% and less than or equal to 20% of the battery capacity, the preset charging time = (battery capacity - remaining power (mAh)) × 1.2 ÷ charging current (mA).

[0072] When the charging current is greater than 20% of the battery capacity, the preset charging time = (battery capacity - remaining power (mAh)) × 1.1 ÷ charging current (mA).

[0073] It is understandable that the less the remaining battery power, the longer the preset charging time.

[0074] Specifically, the charging analysis unit determines to correct the preset charging time based on the comparison result that the charging temperature is greater than the second preset temperature;

[0075] The charging analysis unit does not modify the preset charging time based on a comparison result that the charging temperature is less than or equal to the second preset temperature.

[0076] Specifically, the value range of the second preset temperature is set to [30° C., 50° C.], and 45° C. is preferred in the embodiment of the present invention.

[0077] It is understandable that the higher the charging temperature of the battery, the lower the charging efficiency and the longer the charging time.

[0078] Specifically, the charging analysis unit subtracts the charging temperature from the second preset temperature to obtain a temperature difference, and determines to use a first duration adjustment coefficient to correct the preset charging duration based on a comparison result that the temperature difference is greater than a preset difference value;

[0079] Based on the comparison result that the temperature difference is less than or equal to the preset difference value, it is determined to use a second duration adjustment coefficient to correct the preset charging duration.

[0080] Specifically, the value range of the preset difference is set to [5°C, 15°C], and 10°C is preferred in the embodiment of the present invention; the value range of the first duration adjustment coefficient is set to [1.7, 2.1], and 1.8 is preferred in the embodiment of the present invention; the value range of the second duration adjustment coefficient is set to [1.3, 1.6], and 1.4 is preferred in the embodiment of the present invention.

[0081] Specifically, the charging analysis unit issues an alarm based on a comparison result that the actual charging time is greater than the preset charging time.

[0082] Specifically, the preset charging time is determined by the above method.

[0083] It is understandable that the longer the actual charging time is, the more serious the aging of the battery is and the lower the charging efficiency is. In serious cases, an alarm should be issued to replace the battery.

[0084] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A charging system for electrical automation equipment, characterized in that: include: A battery module, which includes a number of backup batteries arranged in the electrical automation equipment; A data acquisition module, comprising a timer, a voltage sensor for monitoring the input voltage of the electrical automation equipment, a power determination component for monitoring the remaining power of each of the backup batteries, and a temperature sensor for monitoring the charging temperature and the power supply temperature of each of the backup batteries, wherein the power determination component comprises a multimeter for detecting the open circuit voltage of each of the backup batteries; A charging control module, which is connected to the battery module and the data acquisition module respectively, includes: a charging analysis unit, configured to analyze the input voltage to determine a single voltage fluctuation and a fluctuation frequency, so as to determine whether the stability of the input voltage is qualified, to determine whether to correct the remaining power based on the open circuit voltage, to determine a switching sequence, a charging sequence and a preset charging time of each backup battery based on the remaining power, to determine whether to correct the preset charging time based on the charging temperature, and to issue an alarm if the actual charging time is longer than the preset charging time; A charging control unit, responsive to the analysis result of the charging analysis unit, controls the power supply to switch to the battery module based on the unqualified input voltage, and controls each of the backup batteries based on the switching sequence and the charging sequence.

2. The charging system for electrical automation equipment according to claim 1, characterized in that: The charging analysis unit records a voltage fluctuation in which the input voltage is greater than a first preset voltage or less than a second preset voltage as a single voltage fluctuation.

3. The charging system for electrical automation equipment according to claim 2, characterized in that: The charging analysis unit counts the number of single voltage fluctuations within a preset period to determine a fluctuation frequency, and determines that the stability of the input voltage is unqualified based on a comparison result that the fluctuation frequency is greater than a preset frequency.

4. The charging system for electrical automation equipment according to claim 3, characterized in that: When the stability of the input voltage is unqualified, the charging analysis unit determines the switching order of the backup batteries based on the remaining power of each battery collected by the data acquisition module in descending order, and controls the charging control unit to switch to the backup battery with the largest remaining power.

5. The charging system for electrical automation equipment according to claim 4, characterized in that: The charging analysis unit controls the charging control unit to switch to a next backup battery based on a comparison result that the power supply temperature of the backup battery is greater than a first preset temperature.

6. The charging system for electrical automation equipment according to claim 1, characterized in that: The charging analysis unit detects the open circuit voltage of the corresponding backup battery under the condition that the remaining power of each battery collected by the data acquisition module is less than the preset power, and determines to correct the remaining power based on the comparison result that the open circuit voltage is less than the preset voltage, so as to calculate the preset charging time based on the remaining power and determine the charging order in ascending order.

7. The charging system for electrical automation equipment according to claim 6, characterized in that: The charging analysis unit obtains a voltage difference by subtracting the open circuit voltage from the preset voltage, and determines to reduce the remaining power by a first power correction coefficient based on a comparison result that the voltage difference is greater than the preset voltage difference; Based on the comparison result that the voltage difference is less than or equal to the preset voltage difference, it is determined to reduce the remaining power by a second power correction coefficient.

8. The charging system for electrical automation equipment according to claim 6, characterized in that: The charging analysis unit determines to correct the preset charging time based on a comparison result that the charging temperature is greater than a second preset temperature.

9. The charging system for electrical automation equipment according to claim 8, characterized in that: The charging analysis unit subtracts the charging temperature from the second preset temperature to obtain a temperature difference, and determines to correct the preset charging duration by a first duration adjustment coefficient based on a comparison result that the temperature difference is greater than a preset difference value; Based on the comparison result that the temperature difference is less than or equal to the preset difference value, it is determined to correct the preset charging time by using a second time adjustment coefficient.

10. The charging system for electric automation equipment according to claim 9, characterized in that: The charging analysis unit issues an alarm based on a comparison result that the actual charging time is greater than the preset charging time.

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