Control circuit, method, circuit breaker and computer readable storage medium for a circuit breaker

Abstract

The application relates to the technical field of circuit breakers, and discloses a control circuit and method of a circuit breaker, the circuit breaker and a computer readable storage medium. The control circuit comprises a sampling module, a signal processing module, a control module and a tripper driving module. The sampling module is used for collecting a current signal of a main circuit of the circuit breaker. The signal processing module is electrically connected with the output end of the sampling module, is used for processing the current signal, and outputs a processed sampling signal. The control module acquires a current calibration sampling current according to the processed sampling signal, performs weighted fusion on the current calibration sampling current and an optimized current at a previous moment according to a preset calibration sampling deviation degree and a current predicted current deviation degree, generates a current optimized current, and generates a corresponding tripping control signal according to a comparison result of the current optimized current and a preset protection threshold. The tripper driving module is electrically connected with the control module and the tripper, and is used for controlling the tripper according to the tripping control signal.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, and in particular to a control circuit, method, circuit breaker, and computer-readable storage medium for a circuit breaker. Background Technology

[0002] As a core protection device in power systems, the reliability and accuracy of circuit breakers directly affect the safe and stable operation of the power grid. Currently, power systems commonly use current transformers to collect line current signals in real time, compare them, and then perform control. However, in actual operating environments, the switching arc noise spectrum generated by circuit breaker opening and closing operations can reach several kilohertz levels, the electromagnetic interference field strength in substations can exceed 100 dB / µV, and ambient temperature fluctuations can cause electronic component parameters to drift by up to 10%. These interference factors can intrude into the sampling circuit through electromagnetic coupling effects, leading to current waveform distortion and abrupt changes in sampled values. Especially under critical conditions of severe system load fluctuations and fault currents approaching protection settings, the superposition of sampling distortion and the rigid criteria of protection logic can cause abnormal behavior in protection devices, such as failure to operate when required or erroneous operation when not required, resulting in unpredictable damage. Summary of the Invention

[0003] In view of this, the embodiments of this application provide a control circuit, method, circuit breaker, and computer-readable storage medium for a circuit breaker, which can effectively solve the problems of weak anti-interference capability and high risk of false tripping and failure to trip of existing circuit breakers.

[0004] In a first aspect, embodiments of this application provide a control circuit for a circuit breaker, including: The sampling module is used to collect the current signal of the main circuit of the circuit breaker; The signal processing module is electrically connected to the output terminal of the sampling module and is used to process the current signal and output the processed sampled signal. The control module, electrically connected to the output of the signal processing module, is configured to obtain the current calibration sampling current based on the processed sampled signal, perform weighted fusion of the current calibration sampling current and the optimized current at the previous moment based on the preset calibration sampling deviation and the current predicted current deviation to generate the current optimized current, and generate the corresponding tripping control signal based on the comparison result of the current optimized current and the preset protection threshold. The trip unit drive module is electrically connected to both the control module and the trip unit, and is used to control the trip unit according to the trip control signal.

[0005] In an optional implementation, a gear adjustment module electrically connected to the control module is also included; The gear adjustment module includes an overload long delay current adjustment unit, an overload long delay time adjustment unit, a short circuit short delay current adjustment unit, a short circuit short delay time adjustment unit, and a short circuit instantaneous current adjustment unit, all of which are electrically connected to the control module. The control module is also used to obtain the corresponding adjustment threshold as the preset protection threshold according to each adjustment unit of the gear adjustment module, and compare the current optimized current with the preset protection threshold according to a preset comparison order, and generate a corresponding trip control signal according to the comparison result.

[0006] In an optional implementation, the signal processing module includes: A differential amplifier unit, the input terminal of which is electrically connected to the output terminal of the sampling module, is used to differentially amplify the current signal and output the amplified signal. A reference signal generation unit, one end of which is used to input a power signal, and the reference signal generation unit is used to generate a reference signal based on the power signal; The signal conversion unit has a first input terminal electrically connected to the output terminal of the differential amplifier unit and a second input terminal electrically connected to the output terminal of the reference signal generation unit. The signal conversion unit is used to perform single-ended conversion on the amplified signal based on the reference signal to obtain the processed sampled signal.

[0007] In an optional implementation, a power supply module is also included, one end of which is used to electrically connect to a power source, and the other end of which is used to provide a power signal to the control circuit.

[0008] In an optional implementation, a communication module is further included, which is communicatively connected to the control module and communicates with a host computer. The control module is also used to transmit the fault information of the circuit breaker to the host computer through the communication module, and to calibrate the preset calibration sampling deviation and the current predicted current deviation according to the calibration command sent by the host computer through the communication module.

[0009] In a second aspect, embodiments of this application provide a control method for a circuit breaker, applied to the control circuit of at least one circuit breaker described in the first aspect above, the method comprising: Acquire the processed sampled signal; Based on the processed sampled signal, the current calibration sampled current is obtained; Obtain the current predicted current deviation, the optimized current at the previous time step, and the preset calibration sampling deviation; The current calibrated sampled current and the optimized current at the previous moment are weighted and fused according to the preset calibration sampling deviation and the current predicted current deviation to generate the current optimized current; Obtain the preset protection threshold; Based on the comparison result between the current optimized current and the preset protection threshold, a corresponding trip control signal is generated.

[0010] In an optional implementation, after generating the current optimized current, the control method further includes: Based on the current predicted current deviation The optimized deviation at the current time is obtained by comparing the preset calibration sampling deviation. The process of obtaining the current predicted current deviation includes: Obtain current fluctuation; The current predicted current deviation is obtained based on the optimized deviation and current fluctuation of the previous time step.

[0011] In an optional implementation, the preset protection threshold includes an instantaneous adjustment threshold, a short-delay adjustment threshold, and a long-delay adjustment threshold; The step of generating a corresponding trip control signal based on the comparison result between the current optimized current and the preset protection threshold includes: A trip signal is generated when the current optimized current is not less than the instantaneous adjustment threshold. The tripping signal is generated when the current optimized current remains not less than the short delay adjustment threshold for a first preset time. The tripping signal is generated when the current optimized current remains not less than the long delay adjustment threshold for a second preset time.

[0012] Thirdly, embodiments of this application provide a circuit breaker, the circuit breaker including the control circuit of at least one circuit breaker described in the first aspect above.

[0013] Fourthly, the present invention provides a computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, performs the steps of the control method for a circuit breaker as described in any one of the first aspects.

[0014] The embodiments of this application have the following beneficial effects: The control circuit of this application includes a sampling module, a signal processing module, a control module, and a trip unit drive module. The sampling module is used to acquire the current signal of the main circuit of the circuit breaker. The signal processing module is electrically connected to the output of the sampling module and is used to process the current signal and output the processed sampling signal. The control module obtains the current calibration sampling current based on the processed sampling signal, and performs weighted fusion of the current calibration sampling current and the optimized current at the previous moment based on the preset calibration sampling deviation and the current predicted current deviation to generate the current optimized current. Based on the comparison result of the current optimized current and the preset protection threshold, the corresponding trip control signal is generated. The trip unit drive module is electrically connected to the control module and the trip unit respectively and is used to control the trip unit according to the trip control signal. This application introduces a calibration sampling current and predicted current fusion mechanism based on deviation dynamic weighting, which enables the control module to balance the instantaneous reliability of the measured data and the stability of the historical trend in real time under strong interference, thereby significantly improving the authenticity of the current characterization and the robustness of the protection action, fundamentally supporting the system's synergistic requirements for high precision, fast response, and strong fault tolerance. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A first structural schematic diagram of the control circuit of the circuit breaker according to an embodiment of this application is shown; Figure 2 A circuit diagram of the signal processing module according to an embodiment of this application is shown; Figure 3 A second structural schematic diagram of the control circuit of the circuit breaker according to an embodiment of this application is shown; Figure 4 A first flowchart of the control method for a circuit breaker according to an embodiment of this application is shown; Figure 5 A second flowchart of the control method for a circuit breaker according to an embodiment of this application is shown; Figure 6 A third flowchart of the control method for a circuit breaker according to an embodiment of this application is shown.

[0017] Explanation of key component symbols: 10: Sampling module; 20: Signal processing module; 21: Differential amplifier unit; 22: Reference signal generation unit; 23: Signal conversion unit; 30: Control module; 40: Trip unit drive module; 50: Trip unit; 60: Gear adjustment module; 70: Communication module; 80: Host computer. Detailed Implementation

[0018] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0019] The components of the embodiments of this application described and illustrated in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] In the following text, the terms "comprising," "having," and their cognates, which may be used in various embodiments of this application, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more combinations thereof. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0021] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be construed as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.

[0022] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] Considering the problems of weak anti-interference capability and high risk of false tripping and failure to trip of existing circuit breakers, this application introduces a calibration sampling current and predicted current fusion mechanism based on dynamic weighting of deviation degree. This enables the control module to weigh the instantaneous reliability of measured data and the stability of historical trends in real time under strong interference, thereby significantly improving the authenticity of current characterization and the robustness of protection action, fundamentally supporting the coordinated requirements of DC system for high precision, fast response and strong fault tolerance.

[0024] The control circuit of this circuit breaker will be described below with reference to some specific embodiments.

[0025] Figure 1 A schematic diagram of a control circuit for a circuit breaker according to an embodiment of this application is shown. This control circuit can be applied to various types of circuit breakers, including but not limited to DC molded case circuit breakers, and is not limited thereto. In specific implementations, it is preferably integrated inside a DC electronic three-stage protected molded case circuit breaker, forming a controller integrating sampling, calculation, judgment, driving, and communication. Exemplarily, the control circuit of the circuit breaker of this application is set in a DC circuit breaker, including: a sampling module 10, a signal processing module 20, a control module 30, and a trip unit drive module 40.

[0026] The sampling module 10 is used to acquire the current signal of the main circuit of the circuit breaker. In one exemplary embodiment, the sampling module 10 uses a low-temperature coefficient precision alloy sampling resistor with a resistance of 0.1mΩ, which is connected in series between the positive and negative terminals of the main circuit. The measured current is linearly converted into a millivolt-level voltage signal, providing a high-quality raw input for subsequent high signal-to-noise ratio processing while ensuring minimal power loss.

[0027] Signal processing module 20 is electrically connected to the output terminal of sampling module 10, and is used to process the current signal and output a processed sampled signal adapted to the input range of the microcontroller analog-to-digital converter; exemplary, such as Figure 2 As shown, the signal processing module 20 includes a differential amplifier unit 21, a reference signal generation unit 22, and a signal conversion unit 23. Specifically, the input terminal of the differential amplifier unit 21 is electrically connected to the output terminal of the sampling module 10. The differential amplifier unit 21 is used to differentially amplify the current signal and output the amplified signal, effectively reducing the high-frequency noise generated during the switching process and the common-mode component introduced by spatial electromagnetic interference. One end of the reference signal generation unit 22 is used to input the power supply signal. The reference signal generation unit 22 is used to generate a reference signal based on the power supply signal. Exemplarily, the reference signal generation unit 22 generates an initial reference voltage of 3.0V based on a built-in high-precision reference chip, and after being divided by a precision resistor and buffered by an operational amplifier, it stably outputs a reference level of 1.5V as the reference signal.

[0028] The first input terminal of the signal conversion unit 23 is electrically connected to the output terminal of the differential amplifier unit 21, and the second input terminal of the signal conversion unit 23 is electrically connected to the output terminal of the reference signal generation unit 22. The signal conversion unit 23 is used to perform single-ended conversion on the amplified signal based on the reference signal to obtain the processed sampled signal. Specifically, the signal conversion unit 23 uses a 1.5V reference as a reference to convert the differentially amplified signal into a single-ended voltage signal centered at 1.5V and fluctuating within a range of ±1.0V, so that the output signal is completely within the unipolar input range of the general-purpose microcontroller, while eliminating the influence of zero-point drift and ensuring that both forward and reverse currents can be detected and quantized with equal accuracy and without bias.

[0029] Compared to traditional solutions that use Hall effect sensors or cascaded multi-stage operational amplifiers, the hardware cost of the signal processing module in this application is reduced by more than half. Furthermore, the deterministic analog circuit structure pre-suppresses common-mode interference and zero-point drift, significantly reducing the dependence of digital algorithms on noise suppression, thereby improving the engineering stability and long-term operational consistency of the entire sampling system.

[0030] The control module 30 is electrically connected to the output of the signal processing module 20. Based on the processed sampled signal, it performs current optimization and protection judgment. Its core function is to convert the voltage signal acquired in the analog domain into a digital current value, and use this value as the basis for driving and protecting logic. This process strictly follows a three-level progressive structure of calibration, prediction, and fusion, taking into account both the inherent continuity characteristics of DC current and the uncertainty of data under strong interference conditions.

[0031] First, the control module 30 performs reference correction on the processed sampled signal after each sampling to obtain the current calibration sampled current. This step achieves an accurate mapping from hardware output to physical current and serves as the data starting point for all subsequent algorithm processing. Specifically, the analog-to-digital conversion value corresponding to a 1.5V reference voltage is used as the reference analog-to-digital conversion value. Subtract the reference analog-to-digital conversion value from the analog-to-digital conversion value corresponding to the currently sampled processed signal. Obtain the actual analog-to-digital conversion value Then, the calibration coefficient k is used to... Linear conversion to instantaneous calibration sampling current ,Right now = *k. Understandably, the calibration coefficient K can be set according to the actual application. When the value is greater than zero, the direction of the main circuit current is determined to be positive; when... If the value is less than zero, it is considered to be reversed.

[0032] Next, control module 30 constructs a current trend prediction model. Specifically, based on the fundamental characteristic of continuous change in DC current, the model is constructed using the previous time step t... Optimized current at time 1 Based on, For t The current fluctuation during the period from 1 to t is set. The current fluctuation is B, which is the amount of current fluctuation. It follows a random distribution characterized by the degree of dispersion of current fluctuation B, thus predicting the trend current at time t. = + Therefore, the predicted current deviation at time t can be derived. = +B, where The deviation of the current at the previous moment is optimized, i.e., the optimized deviation. This design enables the system to actively utilize historical trend information, providing a stable reference when the measured signal is disturbed, significantly enhancing the timing consistency of the current characterization. The control module 30 also establishes a current sampling calibration model, which addresses measurement errors introduced by factors such as analog-to-digital conversion, operational amplifier temperature drift, and circuit board layout. This leads to the calibration sampling current. There is a deviation from the actual current. This error is modeled as a preset calibration sampling deviation D, the value of which is determined by the variance obtained from continuously collecting 100 analog-to-digital conversion values ​​under the no-load condition of the circuit breaker, with a typical value of 0.7. Therefore, the deviation of the sampled calibration current at time t is always D, reflecting the essential characteristic that instantaneous reliability is dominated by environmental noise.

[0033] Based on this, the control module 30 executes a dynamic allocation model to obtain the current predicted current deviation, the optimized current at the previous moment, and the preset calibration sampling deviation. It then weights and fuses the current calibrated sampling current and the optimized current at the previous moment according to the preset calibration sampling deviation and the current predicted current deviation to generate the current optimized current. Specifically, the control module 30 defines weights based on the preset calibration sampling deviation and the reciprocal of the current predicted current deviation, and then weights the optimized current at the previous moment... Compared with the current calibration sampling current Weighted fusion to generate the optimal current at time t . Specifically, ; Furthermore, after generating the current optimized current, the control method also includes: obtaining the optimized deviation at the current time based on the current predicted current deviation and the preset calibration sampling deviation. Obtaining the current predicted current deviation includes: obtaining the current fluctuation, and obtaining the current predicted current deviation based on the optimized deviation at the previous time and the current fluctuation. That is, updating the optimized deviation at time t. Current predicted current deviation = +B, this mechanism ensures that data sources with smaller current fluctuations (B) and lower preset calibration sampling deviations (D) receive higher weights, thereby automatically suppressing the influence of measured current when interference surges and fully responding to real changes when the current is stable, achieving an adaptive balance between accuracy and speed.

[0034] Control module 30 repeats the above process with a fixed period of 100 microseconds: each period completes one sampling and one actual analog-to-digital conversion value. Calculate and perform a first-time calibration sampling current. Conversion, primary optimization current Deviation after fusion and first optimization Updated. This deterministic real-time scheduling mechanism ensures that the current value is refreshed every 100 microseconds. The entire current optimization process operates efficiently under the constraints of microcontroller resources, requiring no additional hardware costs. Compared to traditional mean filtering, this embodiment significantly improves the signal-to-noise ratio at the same sampling rate while reducing the false alarm rate, achieving an organic unity of high precision, fast response, and strong fault tolerance.

[0035] The control module 30 is also used to acquire a preset protection threshold and generate a corresponding trip control signal based on the comparison between the current optimized current and the preset protection threshold. The preset protection threshold can be set according to the actual application; for example, such as... Figure 3 As shown, the control circuit also includes a gear adjustment module 60 electrically connected to the control module 30, through which a preset protection threshold is set. The gear adjustment module 60 includes an overload long-delay current adjustment unit, an overload long-delay time adjustment unit, a short-circuit short-delay current adjustment unit, a short-circuit short-delay time adjustment unit, and a short-circuit instantaneous current adjustment unit, all electrically connected to the control module 30. Exemplarily, each adjustment unit is a rotary encoder, corresponding to five sets of core parameters: overload long-delay protection current, overload long-delay protection time, short-circuit short-delay protection current, short-circuit short-delay protection time, and short-circuit instantaneous protection current. The control module 30 obtains the corresponding adjustment threshold from each adjustment unit of the gear adjustment module 60 as the preset protection threshold.

[0036] The preset protection thresholds include the instantaneous adjustment threshold corresponding to the short-circuit instantaneous protection current, the short-delay adjustment threshold corresponding to the short-circuit short-delay protection current, and the long-delay adjustment threshold corresponding to the overload long-delay protection current. Rotary encoders are used to construct the gear adjustment function, with each encoder providing 10 physical gears. This supports tool-free, rapid on-site adjustment, offering intuitive operation and immediate response, completely eliminating the cumbersome process of traditional DIP switches or host computer configuration.

[0037] Each parameter setting is designed to strictly adapt to the actual operating requirements of DC power distribution systems: the overload long-delay current Ir covers nine levels: 0.4In, 0.45In, 0.5In, 0.56In, 0.6In, 0.64In, 0.72In, 0.8In, and 0.88In, with fine steps, balancing long-term overload with small current and short-term withstand with large current; the overload long-delay time Tr offers four options: 12 seconds, 60 seconds, 80 seconds, and off. The long-delay protection uses inverse-time characteristics, with the action time T proportional to the current optimized current. Satisfying T= The overload long delay time Tr and overload long delay current Ir are directly determined by the corresponding range, ensuring that the protection curve strictly meets the relevant standard requirements and satisfies the thermal inertia matching requirements of different loads. The short-circuit short delay current Isd is set with 0.4In as the base multiple, covering 2-10 times for a total of 9 ranges, and has an OFF position to achieve functional shielding. The corresponding time Tsd is selectable in three ranges of 30 milliseconds, 45 milliseconds, and 60 milliseconds, ensuring that there is a clear time difference between circuit breakers. The short-circuit instantaneous current Ii is also set based on 0.4In, with 3-10 times for a total of 8 ranges, and the instantaneous tripping time is fixed at 30 milliseconds, ensuring the ability to quickly cut off metallic short circuits.

[0038] The control module 30 compares the current optimized current with a preset protection threshold according to a preset comparison order, and generates a corresponding trip control signal based on the comparison result. Exemplarily, the preset comparison order is a three-level sequential logic: instantaneous priority, short-delay priority, and long-delay fallback. A trip signal is generated when the current optimized current is not less than the instantaneous adjustment threshold; a trip signal is generated when the current optimized current remains not less than the short-delay adjustment threshold for a first preset time; and a trip signal is generated when the current optimized current remains not less than the long-delay adjustment threshold for a second preset time. This hierarchical mechanism effectively avoids cascading tripping and significantly improves system selectivity and power supply continuity. The trip unit drive module 40 is electrically connected to both the control module 30 and the trip unit 50, and is used to control the trip unit 50 according to the trip control signal. Specifically, if the trip control signal is a trip signal, the trip unit 50 is controlled to trip; if the trip control signal is a non-trip signal, the trip unit 50 is not controlled to trip.

[0039] Furthermore, the control circuit also includes a power supply module. One end of the power supply module is used for electrical connection to the power source, and the other end is used to provide power signals to the control circuit. The power supply module integrates input rectification, wide-range DC-DC conversion, and multi-stage voltage regulation and isolation circuits, supporting a wide AC / DC voltage input from 100V to 300V. It is compatible with various power supply systems commonly found in industrial environments, such as AC220V, DC220V, and DC110V, without the need for an external adapter. The output can be set according to the actual application. For example, 12V / 1A is used to drive the trip unit 50 coil; 5V / 500mA is used to power the microcontroller main control unit and communication interface; and 3.3V / 300mA is dedicated to the high-precision analog-to-digital converter module and operational amplifier circuit, eliminating crosstalk of digital noise to the analog signal chain. This allows the control module 30 to operate stably for a long time under complex operating conditions such as power grid fluctuations, harmonic interference, and mixed AC / DC operation, significantly improving the product's environmental adaptability.

[0040] Furthermore, such as Figure 3 As shown, the control circuit also includes a communication module 70 that communicates with the control module 30. The communication module 70 communicates with the host computer 80. The communication module 70 is implemented based on the microcontroller's built-in UART peripheral, using the standard Modbus RTU protocol, and establishes a reliable connection with the host computer 80 via an RS485 bus. The control module 30 transmits the circuit breaker's fault information to the host computer 80 through the communication module 70, and calibrates the preset calibration sampling deviation and the current predicted current deviation according to the calibration command sent by the host computer 80 through the communication module 70. This achieves remote, precise maintenance and life-cycle accuracy assurance. The fault information may include the fault occurrence time accurate to milliseconds, fault type, fault current peak value, and corresponding protection section operation information.

[0041] Furthermore, the control circuit also includes an LED indicator module, which uses multi-color high-brightness surface-mount LEDs to indicate power status, operating status, fault type, and communication activity. The logic of each indicator light is strictly synchronized with the internal protection actions, enabling rapid on-site status identification and initial fault diagnosis without the need for additional diagnostic tools.

[0042] This control circuit is based on six functional modules: sampling module 10, signal processing module 20, control module 30, trip unit drive module 40, gear adjustment module 60, and communication module 70. Supplemented by a power supply module and an LED indicator module, it constructs a complete closed-loop control system integrating high-precision sensing, intelligent decision-making, flexible setting, reliable execution, and two-way interaction. Compared to traditional thermomagnetic or basic electronic solutions, the hardware cost of this architecture is reduced to less than 50% of similar current sensor solutions. Furthermore, this application utilizes a hardware-software co-design paradigm, enabling the DC molded case circuit breaker to truly possess intelligent characteristics of self-sensing, self-judgment, self-setting, and self-maintenance, providing a safe, reliable, and flexible core protection unit for new DC power distribution systems.

[0043] In one embodiment, Figure 4 This paper illustrates a flowchart of a circuit breaker control method according to an embodiment of this application. The circuit breaker control method provided in this application is applied to the control circuit of the circuit breaker in any of the above embodiments, and specifically includes steps S101-S106: S101, acquire the processed sampled signal; S102, obtain the current calibration sampling current based on the processed sampled signal; S103, obtain the current predicted current deviation, the optimized current at the previous moment, and the preset calibration sampling deviation; S104, The current calibration sampling current and the optimized current at the previous moment are weighted and fused according to the preset calibration sampling deviation and the current predicted current deviation to generate the current optimized current; S105, Obtain the preset protection threshold; S106, Based on the comparison result between the current optimized current and the preset protection threshold, generate the corresponding trip control signal.

[0044] In one embodiment, based on the above embodiments, after generating the current optimized current, the control method further includes obtaining the optimized deviation at the current moment based on the current predicted current deviation and the preset calibration sampling deviation; like Figure 5 As shown, obtaining the current predicted current deviation in S103 includes: S201, obtain the current fluctuation; S202, obtain the current predicted current deviation based on the optimized deviation and current fluctuation of the previous moment.

[0045] In one embodiment, based on the above embodiments, the preset protection threshold includes an instantaneous adjustment threshold, a short-delay adjustment threshold, and a long-delay adjustment threshold; such as Figure 6 As shown, based on the comparison between the current optimized current and the preset protection threshold, the corresponding trip control signal is generated, including: S301, when the current optimized current is not less than the instantaneous adjustment threshold, a trip signal is generated; S302, when the current optimized current is not less than the short delay adjustment threshold for a first preset time, a trip signal is generated; S303: When the current optimized current remains not less than the long delay adjustment threshold for a second preset time, a trip signal is generated.

[0046] It is understood that the methods in the above embodiments correspond to the circuits in the above embodiments, and the options in the above embodiments are also applicable to this embodiment. The control method provided by this application embodiment can realize the function of the control circuit of the circuit breaker corresponding to the above embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0047] This application also provides a circuit breaker, exemplary of which the circuit breaker includes the control circuit of the circuit breaker described above.

[0048] This application also provides a computer-readable storage medium for storing a computer program corresponding to the control method of the circuit breaker described above. For example, the computer-readable storage medium may include, but is not limited to, various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0049] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that, in alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0050] In addition, the functional modules or units in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0051] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a smartphone, personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0052] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A control circuit for a circuit breaker, characterized in that, include: The sampling module is used to collect the current signal of the main circuit of the circuit breaker; The signal processing module is electrically connected to the output terminal of the sampling module and is used to process the current signal and output the processed sampled signal. The control module, electrically connected to the output of the signal processing module, is configured to obtain the current calibration sampling current based on the processed sampled signal, perform weighted fusion of the current calibration sampling current and the optimized current at the previous moment based on the preset calibration sampling deviation and the current predicted current deviation to generate the current optimized current, and generate the corresponding tripping control signal based on the comparison result of the current optimized current and the preset protection threshold. The trip unit drive module is electrically connected to both the control module and the trip unit, and is used to control the trip unit according to the trip control signal.

2. The control circuit of the circuit breaker according to claim 1, characterized in that, It also includes a gear adjustment module electrically connected to the control module; The gear adjustment module includes an overload long delay current adjustment unit, an overload long delay time adjustment unit, a short circuit short delay current adjustment unit, a short circuit short delay time adjustment unit, and a short circuit instantaneous current adjustment unit, all of which are electrically connected to the control module. The control module is also used to obtain the corresponding adjustment threshold as the preset protection threshold according to each adjustment unit of the gear adjustment module, and compare the current optimized current with the preset protection threshold according to a preset comparison order, and generate a corresponding trip control signal according to the comparison result.

3. The control circuit of the circuit breaker according to claim 1, characterized in that, The signal processing module includes: A differential amplifier unit, the input terminal of which is electrically connected to the output terminal of the sampling module, is used to differentially amplify the current signal and output the amplified signal. A reference signal generation unit, one end of which is used to input a power signal, and the reference signal generation unit is used to generate a reference signal based on the power signal; The signal conversion unit has a first input terminal electrically connected to the output terminal of the differential amplifier unit and a second input terminal electrically connected to the output terminal of the reference signal generation unit. The signal conversion unit is used to perform single-ended conversion on the amplified signal based on the reference signal to obtain the processed sampled signal.

4. The control circuit of the circuit breaker according to claim 1, characterized in that, It also includes a power module, one end of which is used to electrically connect to a power source, and the other end of which is used to provide a power signal to the control circuit.

5. The control circuit of the circuit breaker according to claim 1, characterized in that, It also includes a communication module that is communicatively connected to the control module, and the communication module is communicatively connected to the host computer; The control module is also used to transmit the fault information of the circuit breaker to the host computer through the communication module, and to calibrate the preset calibration sampling deviation and the current predicted current deviation according to the calibration command sent by the host computer through the communication module.

6. A control method for a circuit breaker, characterized in that, The method, applied to the control circuit of the circuit breaker according to any one of claims 1-5, comprises: Acquire the processed sampled signal; Based on the processed sampled signal, the current calibration sampled current is obtained; Obtain the current predicted current deviation, the optimized current at the previous time step, and the preset calibration sampling deviation; The current calibrated sampled current and the optimized current at the previous moment are weighted and fused according to the preset calibration sampling deviation and the current predicted current deviation to generate the current optimized current; Obtain the preset protection threshold; Based on the comparison result between the current optimized current and the preset protection threshold, a corresponding trip control signal is generated.

7. The control method for a circuit breaker according to claim 6, characterized in that, After generating the current optimized current, the control method further includes: The optimized deviation at the current moment is obtained based on the current predicted current deviation and the preset calibration sampling deviation. The process of obtaining the current predicted current deviation includes: Obtain current fluctuation; The current predicted current deviation is obtained based on the optimized deviation and current fluctuation of the previous time step.

8. The control method for a circuit breaker according to claim 6, characterized in that, The preset protection thresholds include instantaneous adjustment thresholds, short-delay adjustment thresholds, and long-delay adjustment thresholds; The step of generating a corresponding trip control signal based on the comparison result between the current optimized current and the preset protection threshold includes: A trip signal is generated when the current optimized current is not less than the instantaneous adjustment threshold. The tripping signal is generated when the current optimized current remains not less than the short delay adjustment threshold for a first preset time. The tripping signal is generated when the current optimized current remains not less than the long delay adjustment threshold for a second preset time.

9. A circuit breaker, characterized in that, The circuit breaker includes the control circuit of the circuit breaker according to any one of claims 1-5.

10. A computer-readable storage medium storing a computer program thereon, characterized in that, When the computer program is run by the processor, it performs the steps of the control method for the circuit breaker as described in any one of claims 6-8.

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