Active learning method and active learning system applied to switch box output circuit

Abstract

The invention relates to an active learning method and an active learning system applied to a switch box output circuit, and belongs to the field of power electronics. The active learning method comprises the following steps: after equipment is connected to the output end of a switch box output circuit, obtaining an equipment characteristic curve of the access equipment according to the parameter change of the access equipment; obtaining a fitted equipment characteristic curve according to the equipment characteristic curve of the access equipment and a preset curve deviation range; determining whether the device type of the access device is a device type needing voltage stabilization or a device type needing current limiting according to the fitted device characteristic curve; if the equipment needs voltage stabilization, working parameters of a pre-charging circuit in a switch box output circuit are adjusted; and if the current is required to be limited, adjusting a threshold value in a short circuit identification criterion. According to the invention, the equipment type of the access equipment can be accurately identified, and the intelligent management degree of the switch box output circuit is improved.

Description

Technical Field

[0001] The invention relates to an active learning method and an active learning system applied to a switch box output circuit, and belongs to the field of power electronics. Background Art

[0002] In today's rapidly developing field of power electronics and intelligent control technology, with the vigorous rise of industrial automation, smart home, new energy vehicles and other fields, the importance of the design of the switch box output circuit as a key link in power distribution and protection has become increasingly prominent. Both domestic and foreign research and application in this field have made significant progress. However, in the face of increasingly complex and changeable circuit environments and ever-increasing intelligent needs, the existing technology still has certain limitations. For example, it is impossible to accurately identify the type of equipment connected to the device, resulting in a low degree of intelligent management of the switch box output circuit. Summary of the invention

[0003] The purpose of the present invention is to provide an active learning method and an active learning system applied to a switch box output circuit, so as to solve the problem in the prior art that the intelligent management level of the switch box output circuit is not high.

[0004] To achieve the above object, the solution of the present invention includes: An active learning method for a switch box output circuit of the present invention comprises the following steps: After the device is connected to the output end of the output circuit of the switch box, the device characteristic curve of the connected device is obtained according to the parameter change of the connected device; Obtaining a fitted device characteristic curve according to the device characteristic curve of the access device and a preset curve deviation range; Determine, based on the fitted device characteristic curve, whether the device type of the connected device is a device type that requires voltage stabilization or a device type that requires current limiting; If it is a device that requires voltage stabilization, adjust the operating parameters of the pre-charging circuit in the output circuit of the switch box; if it is a device that requires current limiting, adjust the threshold in the short-circuit identification criterion.

[0005] Furthermore, after obtaining the fitted device characteristic curve, determine whether the fitted device characteristic curve is similar to the device characteristic curve in the database; if similar, classify the access device into the corresponding device type; otherwise, store the fitted device characteristic curve in the database. If it is later determined manually that the access device is a device that requires voltage stabilization or a device that requires current limiting, the fitted device characteristic curve newly stored in the database is marked as the corresponding device type.

[0006] Further, the short circuit identification criterion includes: when the current value of the connected device at the current moment exceeds the current value at the corresponding moment of any one of the preset multiple short circuit identification curves and reaches the preset threshold of the short circuit identification curve, it is determined that a short circuit occurs and short circuit protection is executed; Adjusting the threshold in the short circuit identification criterion includes: lowering the preset threshold of the short circuit identification curve to meet the current upper limit required by the current limiting device; Among them, each short-circuit identification curve corresponds to a different short-circuit situation.

[0007] Further, performing the short circuit includes: cutting off the fault line.

[0008] Furthermore, executing the short circuit also includes: recording fault information.

[0009] Furthermore, executing the short circuit also includes: alarming.

[0010] Furthermore, the alarm includes: an indicator light lighting up and / or a buzzer alarm.

[0011] Furthermore, the pre-charging circuit includes: a pre-charging resistor for current limiting, a capacitor for filtering and voltage stabilization, and a contactor for controlling the pre-charging resistor to join and exit the charging circuit; Adjusting the working parameters of the pre-charging circuit includes: the charging and discharging time of the capacitor and the opening and closing time of the contactor, so as to stably output the voltage required by the voltage-stabilizing equipment.

[0012] An active learning system applied to a switch box output circuit of the present invention comprises a processor, and the processor executes a computer program to implement the steps of the active learning method applied to the switch box output circuit as described above.

[0013] The beneficial effects of the present invention are as follows: as a pioneering invention, the present invention is an active learning method and active learning system applied to the switch box output circuit, by obtaining the device characteristic curve of the access device according to the parameter changes of the access device; obtaining the fitted device characteristic curve according to the device characteristic curve of the access device and the preset curve deviation range; determining whether the device type of the access device is a device type that requires voltage stabilization or a device type that requires current limiting according to the fitted device characteristic curve; if it is a device that requires voltage stabilization, adjusting the working parameters of the pre-charging circuit in the switch box output circuit; if it is a device that requires current limiting, adjusting the threshold in the short circuit identification criterion. The present invention can accurately identify the device type of the access device, determine the corresponding control strategy according to the device type, so that the access device can work in the optimal working environment, and improve the degree of intelligent management of the switch box output circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1is a flow chart of an active learning method applied to a switch box output circuit provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of a flow chart of a short circuit time determination criterion provided by an embodiment of the present invention; Figure 3 It is a structural schematic diagram of a pre-charging circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] The idea of ​​the present invention is to obtain a device characteristic curve of the access device according to parameter changes of the access device; obtain a fitted device characteristic curve according to the device characteristic curve of the access device and a preset curve deviation range; determine whether the device type of the access device is a device type that requires voltage stabilization or a device type that requires current limiting according to the fitted device characteristic curve; if it is a device that requires voltage stabilization, adjust the working parameters of the pre-charging circuit in the output circuit of the switch box; if it is a device that requires current limiting, adjust the threshold in the short circuit identification criterion.

[0017] An embodiment of an active learning method applied to a switch box output circuit: Figure 1 is a flow chart of an active learning method applied to a switch box output circuit provided by an embodiment of the present invention, such as Figure 1 As shown, the active learning method includes: S101. Obtain a device characteristic curve of an access device according to parameter changes of the access device.

[0018] Among them, parameter changes refer to changes in the voltage, current, etc. of the connected equipment; the equipment characteristic curve refers to the voltage-current curve, power-time curve, etc. of the equipment. These characteristic curves reflect the electrical characteristics and working rules of the connected equipment and are the basis for subsequent learning and memory.

[0019] As an optional implementation, parameter changes of access devices in different operating states can be collected to generate device characteristic curves in corresponding operating states. The operating state can be a normal operating state or a fault operating state, etc., which is not particularly limited in the present invention.

[0020] Among them, the parameter changes can be monitored in real time through voltage sensors and current sensors, and then the monitored data (i.e., the voltage, current and other electrical quantities of the connected equipment) are processed and analyzed to obtain the equipment characteristic curve of the connected equipment.

[0021] After obtaining the device characteristic curve of the access device, the characteristic curve of the access device is stored for subsequent calling.

[0022] S102: Obtain a fitted device characteristic curve according to the device characteristic curve of the access device and a preset curve deviation range.

[0023] Since the device characteristic curve formed by the data directly collected by the voltage sensor and the current sensor may be inaccurate, in order to make the device characteristic curve of the connected device more accurately reflect the electrical characteristics and working rules of the device, as an optional implementation method, a preset curve deviation range will be added, and a fitted device characteristic curve will be obtained based on the device characteristic curve of the connected device and the preset curve deviation range. The fitted device characteristic curve can more accurately reflect the electrical characteristics and working rules of the connected device.

[0024] The preset curve deviation range may be set based on the standard deviation or the allowable error range of the device characteristic curve, which is used to determine the acceptable difference between the device characteristic curve of the access device and the ideal or standard characteristic curve.

[0025] In order to further understand the preset curve deviation range, the following is an exemplary description of how to set the curve deviation range in advance when the device characteristic curve is a voltage-current curve and a power-time curve.

[0026] Specifically, if the device characteristic curve of the access device is a voltage-current curve, the preset curve deviation range can be set to a percentage value or a specific voltage or current value. For example, it can be set that any point of the voltage-current curve deviates from the standard curve by no more than ±5% or ±0.5 amperes (A). It can be understood that ±5% and ±0.5A are only examples for illustrative purposes. In actual applications, they can be set according to actual conditions, and the present invention does not specifically limit this.

[0027] If the device characteristic curve of the access device is a power-time curve, the preset curve deviation range can be set as a percentage change in power or an upper and lower limit of power fluctuation in a specific time period. For example, the power fluctuation at any time point or time period can be set to not exceed ±10% or ±10 kilowatts (KW). It can be understood that ±10% and ±10KW are only examples for illustrative purposes. In actual applications, they can be set according to actual conditions, and the present invention does not specifically limit this.

[0028] It is understandable that the preset curve deviation range can also be applied to other aspects, for example, when the shape of the curve is required to be consistent: the overall shape of the equipment characteristic curve is required to be similar to the standard curve, and there should be no obvious abnormal fluctuations or mutations; for example, when the tolerance of the dynamic response characteristics is required: for the dynamic response characteristics of the equipment (such as voltage / current changes during startup, stop or load changes), the preset curve deviation range can be set to the maximum deviation or response time in the dynamic process, and the voltage fluctuation of the equipment during the startup process can be set not to exceed ±Z volts (Z is a specific value), or to reach a stable state within a certain period of time.

[0029] S103, determine whether the fitted device characteristic curve is similar to the device characteristic curve in the database. If similar, the access device is classified into the corresponding device type; otherwise, the device characteristic curve of the access device is stored in the database. If it is determined manually later that the access device is a device that requires voltage stabilization or current limiting, the fitted device characteristic curve newly stored in the database is marked as the corresponding device type.

[0030] Among them, there are multiple device characteristic curves in the database, which are stored in advance in the output circuit of the switch box by R&D personnel according to different load conditions before the switch box output circuit leaves the factory. One type of device can correspond to multiple device characteristic curves. The device type can be a device that requires voltage stabilization or a device that requires current limiting, etc. Accordingly, each type of device has a corresponding control strategy.

[0031] As an optional implementation, similarity can be judged by difference. If the difference between the fitted device characteristic curve and the device characteristic curve in the database is less than 1, it is considered that there is a device characteristic curve similar to the fitted device characteristic curve among the numerous device characteristic curves in the database. If there are multiple device characteristic curves with a difference less than 1 in the database, the one with the smallest difference is selected as the most similar device characteristic curve, and the device type of the access device is classified into the device type corresponding to the device characteristic curve. If the difference between the fitted device characteristic curve and the device characteristic curve in the database is not less than 1, it is considered that there is no device characteristic curve similar to the fitted device characteristic curve among the numerous device characteristic curves in the database, and the device characteristic curve of the access device is stored in the database, the database is updated, and the fitted device characteristic curve of the access device is used as the representative of this type of device.

[0032] S104: Determine the device type of the access device according to the fitted device characteristic curve of the access device.

[0033] It is understandable that, for those skilled in the art, after knowing the characteristic curve of the device, it is possible to determine what type of device the device is. S105, automatically adjusting the control strategy according to the device type.

[0034] If the device type is a device that requires current limiting, adjust the threshold in the short circuit identification criterion.

[0035] Among them, the short circuit identification criteria can refer to Figure 2 , Figure 2 FIG. 1 is a flow chart of a short circuit time determination criterion provided by an embodiment of the present invention. Figure 2 As shown, the short circuit identification method includes the following steps: S201. Detect current.

[0036] The current of the output circuit of the switch box can be detected in real time by a current transformer, or by a current sensor, etc., and the present invention does not specifically limit this. The following uses the current sensor detecting the current of the output circuit of the switch box in real time as an example for exemplary description.

[0037] S202, determine whether the preset condition is met. If yes, perform short circuit protection, that is, perform step S203; otherwise, continue to detect the current, that is, perform step S201.

[0038] As an optional implementation, determining whether the preset condition is met can be to determine whether the current value of the connected device at the current moment exceeds the current value at the corresponding moment of any one of the preset multiple short-circuit identification curves. If so, it is considered that a short circuit has occurred, otherwise no short circuit has occurred.

[0039] In order to improve the accuracy of short circuit identification and reduce the situation where the current of the connected device suddenly increases due to jitter or other reasons, rather than the current increase caused by the short circuit, as an optional implementation method, judging whether the preset condition is met can be judging whether the current value of the connected device at the current moment exceeds the current value at the corresponding moment of any one of the preset multiple short circuit identification curves and reaches the preset threshold of the short circuit identification curve. If yes, it is considered that a short circuit has occurred, otherwise no short circuit has occurred.

[0040] The embodiment of the present invention is exemplified by judging whether the preset condition is met, which can be judging whether the current value of the connected device at the current moment exceeds the current value at the corresponding moment of any one of the preset multiple short-circuit identification curves and reaches the preset threshold of the short-circuit identification curve.

[0041] Among them, the preset short-circuit identification curve can be one or more, and the present invention does not make any special limitation on this. In order to cover most short-circuit fault conditions, the embodiment of the present invention takes the case where there are multiple preset short-circuit identification curves as an example for illustrative explanation.

[0042] Among them, the preset short-circuit identification curves are all determined according to the short-circuit current characteristics in the corresponding short-circuit situation. Since the current will fluctuate within the rated range during normal operation and increase rapidly during short circuit and present a specific waveform, before the output circuit of the switch box leaves the factory, the developers will extract the short-circuit current characteristics under different short-circuit fault conditions to form the corresponding short-circuit identification curves under different short-circuit fault conditions, and store these short-circuit identification curves in the database for subsequent calls.

[0043] The rated range is determined according to actual conditions, and the present invention does not impose any special limitation on this.

[0044] After the current sensor collects the current of the connected device, it will be compared with the preset short-circuit identification curve in the database. When the current value of the switch box output circuit at the current moment exceeds the current value at the corresponding moment of any of the preset multiple short-circuit identification curves and reaches the preset threshold of the short-circuit identification curve, a short-circuit fault is determined to have occurred.

[0045] S203, executing short circuit protection.

[0046] Specifically, after determining that a short circuit fault has occurred, in order to prevent damage to the access device and reduce the occurrence of safety accidents, as an optional implementation, a control signal can be sent to a protection element, and the protection element will quickly cut off the fault circuit.

[0047] The protection element may be a circuit breaker or a fuse, etc., and the present invention does not specifically limit this.

[0048] In order to facilitate subsequent troubleshooting and handling of faults, as an optional implementation, after determining the short circuit fault, the fault information is also recorded and stored.

[0049] In order to facilitate maintenance personnel to understand the working condition of the circuit, as an optional implementation method, after determining that a short circuit fault has occurred, an alarm is also sent to the maintenance personnel through alarm devices such as indicator lights and buzzers to prompt the maintenance personnel that a short circuit fault has occurred in the circuit, and the maintenance personnel conduct troubleshooting and processing.

[0050] The short-circuit identification criterion provided by the embodiment of the present invention stores the short-circuit identification curves under different short-circuit fault conditions in advance, compares the magnitude relationship between the current value at the current moment and the current threshold value at the corresponding moment on the preset short-circuit identification curve, and when the current threshold value is exceeded, it is considered that a short-circuit fault exists. Due to different short-circuit fault conditions, the magnitude of the short-circuit current under the same short-circuit fault condition is also different. Therefore, compared with the prior art, which has always used a current threshold value as a judgment condition, the present invention forms different short-circuit identification curves according to different short-circuit fault conditions, and has different current threshold values ​​at different moments. By comparing the magnitude of the current threshold value on the preset curve at the corresponding moment and the collected current value, it is possible to better judge whether there is a short-circuit fault, reduce the situation that only one threshold value is set, the threshold value is too low, the fault is misjudged, and the threshold value is set too high, the fault is missed, and the accuracy of the judgment of the short-circuit fault condition is improved, thereby improving the universality of the output circuit of the switch box.

[0051] If the device type is a device that requires voltage regulation, adjust the operating parameters of the pre-charge circuit.

[0052] Specifically, the structural diagram of the pre-charging circuit can be referred to Figure 3 , Figure 3 is a schematic diagram of a pre-charging circuit provided by an embodiment of the present invention, such as Figure 3 As shown, the pre-charging circuit 100 includes: a power supply, a pre-charging group R, a capacitor C and a contactor K. The positive electrode ("+") of the power supply is connected to one end of the capacitor C through the pre-charging group R, and the other end of the capacitor C is connected to the negative electrode ("-") of the power supply. The contactor K is connected in parallel to both ends of the pre-charging group R, and the control end of the contactor K is used to connect to a control system (not shown).

[0053] Among them, the pre-charging resistor R is a current limiting resistor, and its main function is to limit the current at the initial stage of the pre-charging circuit startup to prevent damage to subsequent equipment or grid fluctuations due to instantaneous large currents. The resistance value of the pre-charging resistor R is selected based on the load characteristics of the connected equipment and the expected starting current to ensure that the current always remains within a safe range during the pre-charging process.

[0054] The connected devices refer to different electrical devices connected by users, such as refrigerators, air conditioners, electric vehicles, etc., which are not particularly limited in the present invention; the load characteristics of the equipment refer to the electrical characteristics and working rules of the equipment.

[0055] Among them, the capacitor C plays the role of energy storage and filtering in the pre-charging circuit 101. At the initial start-up of the pre-charging circuit 101, the capacitor C is charged through the pre-charging resistor R, gradually accumulating electric energy and smoothing the output voltage waveform, reducing the impact of voltage fluctuations on the subsequent equipment. As the capacitor C is charged, the voltage across it gradually rises. When the physical quantity of the capacitor C reaches a preset threshold, the capacitor C can be used as a temporary power supply support to provide a stable voltage environment for the subsequent equipment; the selection of the capacitance value of the capacitor C is designed according to the actual situation, and the present invention does not make any special restrictions on this.

[0056] Among them, the physical quantity of capacitor C can be the voltage across capacitor C, the charging time of capacitor C, the current change rate of capacitor C, etc. The present invention does not specifically limit this. The following will take the example that the physical quantity of capacitor C is the voltage across capacitor C as an example for exemplary explanation.

[0057] Among them, the contactor K is used as a control element of the pre-charging circuit 101 to control the connection or disconnection of the pre-charging circuit 101 with the main circuit. Before the pre-charging circuit 101 is started, the contactor K is in a disconnected state, and the pre-charging circuit 101 pre-charges the subsequent equipment through the pre-charging resistor R and the capacitor C. When the physical quantity of the capacitor C reaches / exceeds the preset threshold value (for example, the voltage across the capacitor C reaches a preset value), the contactor K is closed, and the pre-charging circuit 101 is connected to the connected equipment, so that the equipment starts and runs in a stable voltage environment.

[0058] In order to better monitor the operating status of the pre-charging circuit 101, as an optional implementation, the pre-charging circuit 101 is also provided with a voltage sensor (not shown) and a current sensor (not shown), which are respectively used to collect the voltage and current of the pre-charging circuit 101, and can report the voltage and current conditions of the pre-charging circuit 101 to the control system for subsequent calls.

[0059] The following explains Figure 3 The working principle of the pre-charge circuit is provided.

[0060] In the startup phase: the contactor K remains disconnected, the pre-charging resistor R is engaged in the work, and the power supply charges the capacitor C through the pre-charging resistor R. Due to the current limiting effect of the pre-charging resistor R, the charging current is controlled within a safe range. At the same time, the voltage sensor and current sensor monitor the current changes in real time to ensure the safety of the charging process.

[0061] In the transition phase: as the capacitor C is charged, the voltage across it gradually rises. When the voltage across the capacitor C reaches a preset threshold, the contactor K closes. At this time, the pre-charging circuit 101 is connected to the connected device, and the device starts and runs in a stable voltage environment.

[0062] In the stable operation stage: after the contactor K is closed, the pre-charging resistor R no longer works, but the capacitor C still exists as a filter element to further smooth the output voltage waveform and reduce the impact of voltage fluctuations on the subsequent equipment. At the same time, the voltage sensor and current sensor monitor the current changes in real time to ensure the safety of the charging process.

[0063] The voltage stabilization control strategy achieves voltage stabilization effects for different needs by controlling the opening and closing time of the contactor K in the pre-charging circuit and controlling the physical quantity at both ends of the capacitor C to reach / exceed the preset threshold (i.e., the charging and discharging time of the capacitor C).

[0064] The pre-charging circuit 101 achieves precise control of the starting current through the coordinated work of the pre-charging resistor R, capacitor C and contactor K, effectively protecting the subsequent equipment from the impact of surge current, ensuring that the subsequent equipment can smoothly transition to normal working state, improving the reliability and stability of the switch box output circuit, reducing equipment failures and grid fluctuations caused by voltage fluctuations; simplifying the structure of the switch box output circuit, reducing costs and maintenance difficulties.

[0065] Wherein, adjusting the working parameters of the pre-charging circuit includes: adjusting the charging and discharging time of the capacitor C or the opening and closing time of the contactor K. By adjusting the charging and discharging time of the capacitor C and the opening and closing time of the contactor K, a stable voltage can be obtained, and a voltage stabilization control strategy can be implemented. An active learning method applied to a switch box output circuit provided in an embodiment of the present invention obtains a device characteristic curve of an access device according to parameter changes of the access device; obtains a fitted device characteristic curve according to the device characteristic curve of the access device and a preset curve deviation range; determines whether the device type of the access device is a device type that requires voltage stabilization or a device type that requires current limiting according to the fitted device characteristic curve; if it is a device that requires voltage stabilization, adjusts the working parameters of the pre-charging circuit in the output circuit of the switch box; if it is a device that requires current limiting, adjusts the threshold in the short circuit identification criterion. The present invention can accurately identify the device type of the access device, and determine the corresponding control strategy according to the device type, which can make the access device work in the optimal working environment, thereby improving the intelligent management degree of the switch box output circuit. By continuously learning and accumulating data, it is possible to more accurately judge the device status, provide more accurate fault warning and diagnosis services, and improve the intelligence level of the system and user experience.

[0066] An embodiment of an active learning system applied to a switch box output circuit: An embodiment of the present invention provides an active learning system applied to a switch box output circuit, including a processor, wherein the processor executes a computer program to implement the steps of the active learning method applied to the switch box output circuit as described above.

[0067] An active learning system applied to a switch box output circuit provided by an embodiment of the present invention can achieve the same beneficial effects as the aforementioned active learning method applied to a switch box output circuit, which will not be described in detail here.

Claims

1. An active learning method applied to a switch box output circuit, characterized in that: The steps include: After a device is connected to the output end of the output circuit of the switch box, a device characteristic curve of the connected device is obtained according to parameter changes of the connected device; Obtaining a fitted device characteristic curve according to the device characteristic curve of the access device and a preset curve deviation range; Determining, according to the fitted device characteristic curve, whether the device type of the access device is a device type that requires voltage stabilization or a device type that requires current limiting; If it is a device that requires voltage stabilization, adjust the operating parameters of the pre-charging circuit in the output circuit of the switch box; if it is a device that requires current limiting, adjust the threshold in the short-circuit identification criterion.

2. The active learning method applied to the switch box output circuit according to claim 1, characterized in that: After obtaining the fitted device characteristic curve, determining whether the fitted device characteristic curve is similar to the device characteristic curve in the database; If they are similar, the access device is classified into the corresponding device type; otherwise, the fitted device characteristic curve is stored in the database. If it is later determined manually that the access device belongs to a device that requires voltage stabilization or a device that requires current limiting, the fitted device characteristic curve newly stored in the database is marked as the corresponding device type.

3. The active learning method applied to the switch box output circuit according to claim 1, characterized in that: The short circuit identification criterion includes: when the current value of the connected device at the current moment exceeds the current value at the corresponding moment of any one of the preset multiple short circuit identification curves and reaches the preset threshold of the short circuit identification curve, it is determined that a short circuit occurs and short circuit protection is executed; The adjusting the threshold in the short circuit identification criterion includes: lowering the preset threshold of the short circuit identification curve to meet the current upper limit required by the current limiting device; Among them, each short-circuit identification curve corresponds to a different short-circuit situation.

4. The active learning method applied to the switch box output circuit according to claim 3, characterized in that: The performing of short circuiting includes: cutting off the faulty line.

5. The active learning method applied to the switch box output circuit according to claim 4, characterized in that: The performing short circuit further includes: recording fault information.

6. The active learning method applied to the switch box output circuit according to claim 4, characterized in that: The executing short circuit also includes: alarming.

7. The active learning method applied to the switch box output circuit according to claim 6, characterized in that: The alarm includes: an indicator light turning on and / or a buzzer alarm.

8. The active learning method applied to the switch box output circuit according to claim 1, characterized in that: The pre-charging circuit includes: a pre-charging resistor for current limiting, a capacitor for filtering and voltage stabilization, and a contactor for controlling the pre-charging resistor to join and exit the charging circuit; Adjusting the working parameters of the pre-charging circuit includes: the charging and discharging time of the capacitor and the opening and closing time of the contactor, so as to stably output the voltage required by the device that meets the voltage stabilization.

9. An active learning system applied to a switch box output circuit, characterized in that: The method comprises a processor, wherein the processor executes a computer program to implement the steps of the active learning method applied to the switch box output circuit as claimed in any one of claims 1 to 8.

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