A circuit breaker control system and solid state circuit breaker

Abstract

The application discloses a kind of circuit breaker control system and solid-state circuit breaker, belong to electrical protection technical field.The circuit breaker control system includes: current amplification module, control module, first drive module and first switch module;Current amplification module includes first amplification circuit and second amplification circuit;Control module is used to collect the current of first amplification circuit transmission according to first sampling frequency and obtains first current signal, and is handled based on first current signal;Control module is also used to collect the current of second amplification circuit transmission according to second sampling frequency and obtains second current signal, and is handled based on second current signal;First drive module is used to control first switch module to be turned off in response to the first control signal sent by control module.This scheme meets the needs of two kinds of scene requirements of high-frequency sampling and low-frequency sampling, provides two types of protection, improves the adaptability of circuit breaker control system to different load scenes.

Description

Technical Field

[0001] This application relates to the field of electrical protection technology, and in particular to a circuit breaker control system and a solid-state circuit breaker. Background Technology

[0002] With the development of science and technology, all kinds of electrical equipment have appeared in people's daily lives. During use, the safety of the circuit that supplies power to electrical equipment is of paramount importance.

[0003] Currently, solid-state circuit breakers are the most common protective devices for ensuring circuit safety. They can promptly detect short-circuit faults in loads or power supply lines and provide rapid protection. However, most existing solid-state circuit breakers typically employ a single protection scheme, failing to provide multiple types of protection and exhibiting low adaptability. Summary of the Invention

[0004] To address the problems in related technologies, provide more types of protection in solid-state circuit breakers, and improve adaptability to different load scenarios, this application provides a circuit breaker control system and a solid-state circuit breaker. The technical solution is as follows: In one aspect, this application provides a circuit breaker control system, which includes: a current amplification module, a control module, a first drive module, and a first switch module; The current amplification module is electrically connected to the control module, the current amplification module is also electrically connected to the first switch module, the control module is also electrically connected to the first drive module, and the first drive module is also electrically connected to the first switch module. The current amplification module includes a first amplification circuit and a second amplification circuit. The first amplification circuit is used to amplify the input current of the first switching module based on a first amplification factor and transmit it to the control module. The second sampling circuit is used to amplify the input current of the first switching module based on a second amplification factor and transmit it to the control module. The first amplification factor and the second amplification factor are different. The control module is used to acquire the current transmitted by the first amplifier circuit at a first sampling frequency to obtain a first current signal, acquire the cumulative number of times the first current signal exceeds a preset current range, and send a first control signal to the first drive module when the cumulative number is greater than a preset number threshold. The control module is also used to acquire the current transmitted by the second amplifier circuit at the second sampling frequency to obtain a second current signal, acquire the current accumulation energy based on the second current signal, and send the first control signal to the first drive module when the current accumulation energy is greater than a preset energy threshold. The current accumulation energy is the sum of the energy generated by each of the second current signals acquired within a preset time period. The first drive module is used to receive a first control signal sent by the control module, and in response to the first control signal, control the first switch module to turn off.

[0005] Optionally, the input terminal of the first amplifier circuit is electrically connected to the input terminal of the first switching module, the output terminal of the first amplifier circuit is electrically connected to the control module, and the output terminal of the first amplifier circuit is also electrically connected to the input terminal of the second amplifier circuit. The first amplifier circuit is also used to transmit the amplified input current of the first switching module to the second amplifier circuit.

[0006] Optionally, the circuit breaker control system further includes a first detection module, wherein the first input terminal of the first detection module is electrically connected to the input terminal of the first switch module, the second input terminal of the first detection module is electrically connected to the output terminal of the first switch module, and the output terminal of the first detection module is also electrically connected to the first drive module. The first detection module is used to acquire a first voltage signal, and when the first voltage signal is greater than a first voltage threshold, to send a second control signal to the first drive module; the first voltage signal is the voltage signal between the input terminal and the output terminal of the first switch module. The first driving module is also configured to receive a second control signal sent by the first detection module, and in response to the second control signal, control the first switch module to turn off.

[0007] Optionally, the circuit breaker control system further includes a second detection module, the input terminal of which is electrically connected to the input terminal of the first switch module, and the output terminal of which is electrically connected to the first drive module. The second detection module is used to collect the input current of the first switch module to obtain a third current signal, and when the third current signal is greater than the first current threshold, it sends a third control signal to the first drive module. The first driving module is also configured to receive a third control signal sent by the second detection module, and in response to the third control signal, control the first switch module to turn off.

[0008] Optionally, the circuit breaker control system further includes a second switching module, which is electrically connected to the power line in the AC power supply system, and the power line in the AC power supply system is used to supply power to the load. The second switch module is used to control the power line to turn off after the first switch module turns off; The second switch module is also used to control the power line to be turned on before the first switch module is turned on.

[0009] Optionally, the circuit breaker control system further includes a first sampling module, which is electrically connected to the control module; The first sampling module is used to acquire the second voltage signal and send the second voltage signal to the control module. The second voltage signal is the voltage signal input by the AC power supply system to the circuit breaker control system. The control module is also configured to send the first control signal to the first drive module when the second voltage signal is greater than the second voltage threshold. The control module is also used to send the first control signal to the first drive module when the second voltage signal is less than the third voltage threshold.

[0010] Optionally, the control module is further configured to generate a zero-crossing signal based on the second voltage signal after receiving the second voltage signal, the zero-crossing signal being used to indicate that the voltage signal input by the AC power supply system to the circuit breaker control system drops to zero; The control module is also configured to send a fourth control signal to the first drive module in response to generating the zero-crossing signal; The first driving module is also used to receive a fourth control signal sent by the control module, and in response to the fourth control signal, control the first switching module to turn on.

[0011] Optionally, the circuit breaker control system further includes a second sampling module, which is electrically connected to the control module; The second sampling module is used to acquire the fourth current signal and send the fourth current signal to the control module. The fourth current signal is the leakage current signal between the neutral wire and the live wire in the AC power supply system. The control module is also configured to send the first control signal to the first drive module when the fourth current signal is greater than the second current threshold.

[0012] Optionally, the first switching module includes a first MOSFET and a second MOSFET; The source of the first MOSFET is connected to the source of the second MOSFET, and the gate of the first MOSFET is connected to the gate of the second MOSFET. The first terminal of the first switching module is connected to the drain of the first MOSFET, and the second terminal of the first switching module is connected to the drain of the second MOSFET. There is a first node between the gate of the first MOSFET and the gate of the second MOSFET, and the control terminal of the first switching module is connected to the first node. The first switch module is connected to the first drive module through the control terminal.

[0013] In another aspect, this application provides a solid-state circuit breaker that includes a circuit breaker control system as described in one of the preceding aspects.

[0014] The beneficial effects of the technical solutions provided in this application include at least the following: The circuit breaker control system provided in this application includes: a current amplification module, a control module, a first drive module, and a first switch module; the current amplification module is electrically connected to the control module, and also electrically connected to the first switch module; the control module is also electrically connected to the first drive module, and the first drive module is also electrically connected to the first switch module; the current amplification module includes a first amplification circuit and a second amplification circuit, the first amplification circuit being used to amplify the input current of the first switch module based on a first amplification factor and transmit it to the control module, and the second sampling circuit being used to amplify the input current of the first switch module based on a second amplification factor and transmit it to the control module, wherein the first amplification factor and the second amplification factor are different; the control module is used to sample the first sampling frequency according to the first sampling frequency. A first current signal is obtained by amplifying the current transmitted by a second amplifier circuit. The first current signal is accumulated by determining the number of times it exceeds a preset current range. If the accumulated number exceeds a preset threshold, a first control signal is sent to the first drive module. The control module is also used to acquire a second current signal by sampling the current transmitted by a second amplifier circuit at a second sampling frequency. Based on the second current signal, the accumulated current energy is obtained. If the accumulated current energy exceeds a preset energy threshold, a first control signal is sent to the first drive module. The accumulated current energy is the sum of the energy generated by each of the accumulated second current signals within a preset time period. The first drive module receives the first control signal sent by the control module and, in response, controls the first switch module to turn off. This solution amplifies the input current of the first switch module by different factors using a current amplification module, and allows the control module to sample the amplified input current at two different sampling frequencies to obtain the required first and second current signals. This allows the control module to perform different processing based on different current signals, satisfying the needs of both high-frequency and low-frequency sampling scenarios, providing two types of protection, and improving the adaptability of the circuit breaker control system to different load scenarios. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the architecture of a circuit breaker control system provided in an exemplary embodiment of this application; Figure 2 This is a schematic diagram of the circuit structure of a current amplification module in a circuit breaker control system provided by an exemplary embodiment of the present application, in which the first amplification circuit and the second amplification circuit are respectively connected to the input terminal of the first switching module. Figure 3 This application relates to an exemplary embodiment. Figure 2 A schematic diagram of the circuit structure of an amplifier circuit; Figure 4 This is a schematic diagram of the circuit structure of a second amplification circuit of a current amplification module in a circuit breaker control system, provided by an exemplary embodiment of this application, which is indirectly connected to the input terminal of a first switching module through a first amplification circuit. Figure 5 This application relates to an exemplary embodiment. Figure 4 A schematic diagram of the circuit structure of an amplifier circuit; Figure 6 This is a schematic diagram of the circuit structure of a circuit breaker control system provided in an exemplary embodiment of this application; Figure 7 This is a schematic diagram of the circuit structure of a circuit breaker control system provided in an exemplary embodiment of this application; Figure 8 This is a schematic diagram of the circuit structure of a first sampling module provided in an exemplary embodiment of this application; Figure 9 This is a schematic diagram of the circuit structure of a current sampling unit according to an exemplary embodiment of this application; Figure 10 This is a schematic diagram of the circuit structure of a temperature detection module according to an exemplary embodiment of this application. Detailed Implementation

[0017] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0018] In this article, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0019] The solution provided in this application can be used in the architecture of various electrical devices used in daily life, and in real-world scenarios where solid-state circuit breakers are used for short-circuit protection. To facilitate understanding, some terms and application scenarios involved in the embodiments of this application will be briefly introduced below.

[0020] Overload current: When the load on a circuit exceeds its rated permissible power, the current remains higher than the rated current for an extended period, but has not yet reached the level of a short circuit. The circuit remains conductive, but the load is excessive. Examples include situations where sockets are filled with high-power appliances, motors are stalled for extended periods, or cables with insufficient cross-sections are used to power too many devices. In these cases, the current generated in the circuit can be considered an overload current.

[0021] Overload protection: This refers to circuit protection in the event of an overload current.

[0022] Short-circuit current: In alternating current, when phase conductors are directly connected to each other or to the neutral / ground wire, and the load impedance is almost zero, a very large instantaneous inrush current is generated. Common types: three-phase short circuit, two-phase short circuit, and single-phase ground fault.

[0023] Short circuit protection: This refers to circuit protection provided in the event of a short circuit current.

[0024] With the development of science and technology, various electrical devices have appeared in people's daily lives. These include household socket circuits, high-power appliances (including refrigerators, air conditioners, washing machines, etc.), household transformers, relays, and other devices forming a vast electrical network. To quickly disconnect the load of the faulty part in the event of a system failure and ensure the normal operation of the fault-free parts, solid-state circuit breakers are commonly used as electrical protection devices.

[0025] Traditional molded case circuit breakers (MCCBs) suffer from high resistance during closing, resulting in a significant voltage drop in the circuit. They also exhibit slow response times during fault shutdown and are prone to arcing, requiring additional arc suppression devices. The presence of arcing during shutdown also significantly reduces their lifespan. In recent years, wide-bandgap semiconductor silicon carbide (SiC) devices have seen rapid development. SiC devices exhibit significantly lower on-state resistance and on-state voltage drop, high junction temperature tolerance (>350℃), and can be fabricated into high-performance normally-on devices. Among these, the most mainstream SiC device is the silicon carbide metal-oxide-semiconductor field-effect transistor (SiC MOSFET).

[0026] Currently, to improve the response speed of circuit breakers, SiC MOSFET devices are used in solid-state circuit breakers. To adapt to the short-circuit protection of these solid-state circuit breakers, the main short-circuit protection schemes fall into three categories: software algorithm protection, hardware protection using a shunt and comparator, and protection using a dedicated driver chip with Desat desaturation protection. While these three methods can provide protection when a short circuit occurs in the circuit, their primary function is to protect against short-circuit current. In practical applications, in addition to short circuits, circuits may also experience overloads, leakage currents, and other scenarios. Furthermore, most solid-state circuit breakers only employ one protection scheme, resulting in overly simplistic protection against overload currents and leakage currents. They cannot provide comprehensive protection against multiple types of currents and suffer from low adaptability.

[0027] To address the technical challenges of providing more types of protection in solid-state circuit breakers and enhance adaptability to different load scenarios, this application provides a circuit breaker control system. This system can be implemented by combining a first sampling module and a control module. The control module can satisfy both high-frequency sampling for short-circuit protection and low-frequency sampling for overload protection, making the circuit breaker control system more comprehensive and flexibly adaptable to different load scenarios.

[0028] Please refer to Figure 1 This illustrates a schematic diagram of the architecture of a circuit breaker control system provided in an exemplary embodiment of this application. Figure 1 As shown, the circuit breaker control system 100 includes: a current amplification module 101, a control module 102, a first drive module 103, and a first switch module 104.

[0029] The current amplification module 101 is electrically connected to the control module 102, and the current amplification module 101 is also electrically connected to the first switch module 104. The control module 102 is also electrically connected to the first drive module 103, and the first drive module 103 is also electrically connected to the first switch module 104.

[0030] The current amplification module 101 includes a first amplification circuit 101a and a second amplification circuit 101b. The first amplification circuit 101a amplifies the input current of the first switching module 104 based on a first amplification factor and transmits it to the control module 102. The second amplification circuit 101b amplifies the input current of the first switching module 104 based on a second amplification factor and transmits it to the control module 102. The first amplification factor and the second amplification factor are different. That is, in the current amplification module 101, the first amplification circuit 101a amplifies the input current of the first switching module 104 based on the first amplification factor, and the second amplification circuit 101b amplifies the input current of the first switching module 104 based on the second amplification factor, so that the control module 102 receives two amplified input currents.

[0031] Optionally, the control module 102 is used to acquire the current transmitted by the first amplifier circuit 101a at a first sampling frequency to obtain a first current signal, acquire the cumulative number of times the first current signal continuously exceeds a preset current range, and send a first control signal to the first drive module 103 when the cumulative number is greater than a preset threshold. That is, the control module 102 uses the first sampling frequency to acquire the current output by the first amplifier circuit 101a to obtain the corresponding first current signal, detects the first current signal according to a preset current range, counts the cumulative number of times the first current signal continuously exceeds the preset current range, compares the cumulative number with a preset threshold, and sends a first control signal to the first drive module 103 when the cumulative number is greater than the preset threshold. For example, the upper and lower limits of the preset current range are A1 and A2, respectively, and the preset current range is [A1, A2]. If the first current signal acquired based on the first sampling frequency is not within the range [A1, A2], it means that the first current signal exceeds the preset current range, and the cumulative number increases by one. If the first current signal is within the range [A1, A2], it means that the first current signal does not exceed the preset current range, and the cumulative number remains unchanged.

[0032] Optionally, the control module 102 is further configured to acquire the current transmitted by the second amplifier circuit 101b at a second sampling frequency to obtain a second current signal, acquire the current accumulation energy based on the second current signal, and send a first control signal to the first drive module 103 if the current accumulation energy is greater than a preset energy threshold. The current accumulation energy is the sum of the energy generated by each of the second current signals acquired within a preset time period. That is, the control module 102 also uses the second sampling frequency to acquire the current output by the second amplifier circuit 101b to obtain the corresponding second current signal, and calculates the sum of the energy generated by each of the second current signals acquired within the preset time period to obtain the corresponding current accumulation energy. The current accumulation energy is compared with the preset energy threshold, and if the current accumulation energy is greater than the preset energy threshold, a first control signal is sent to the first drive module 103. Both the preset time period and the preset energy threshold can be preset by the developers.

[0033] Optionally, in this scheme, the first sampling frequency and the second sampling frequency are different, and the first sampling frequency is greater than the second sampling frequency. That is, in addition to acquiring the first current signal based on the higher first sampling frequency of the first amplifier circuit 101a and executing the corresponding processing logic, the control module also acquires the second current signal based on the lower second sampling frequency of the second amplifier circuit 101b and executes the corresponding processing logic. The first sampling frequency can typically be set above 100kHz, and the second sampling frequency can typically be set between 5kHz and 20kHz.

[0034] Optionally, the first drive module 103 is used to receive a first control signal sent by the control module 102, and in response to the first control signal, control the first switch module 104 to turn off. That is, if the cumulative number of times exceeds a preset threshold, it indicates that a short-circuit current has occurred in the circuit, and the control module 102 can send a first control signal to the first drive module, so that the first drive module 103 controls the first switch module 104 to open, providing corresponding short-circuit protection; if the accumulated current energy exceeds a preset energy threshold, it indicates that an overload current has occurred in the circuit, and the control module 102 can also send a first control signal to the first drive module, so that the first drive module 103 controls the first switch module 104 to open, providing corresponding overload protection.

[0035] In summary, the circuit breaker control system provided in this application includes: a current amplification module, a control module, a first drive module, and a first switch module; the current amplification module is electrically connected to the control module, and also electrically connected to the first switch module; the control module is also electrically connected to the first drive module, and the first drive module is also electrically connected to the first switch module; the current amplification module includes a first amplification circuit and a second amplification circuit, the first amplification circuit being used to amplify the input current of the first switch module based on a first amplification factor and transmit it to the control module, and the second sampling circuit being used to amplify the input current of the first switch module based on a second amplification factor and transmit it to the control module, wherein the first amplification factor and the second amplification factor are different; the control module is used to sample according to a first sampling frequency. The control module obtains a first current signal by collecting the current transmitted by the first amplification circuit, acquires the cumulative number of times the first current signal continuously exceeds a preset current range, and sends a first control signal to the first drive module when the cumulative number exceeds a preset threshold. The control module also acquires a second current signal by collecting the current transmitted by the second amplification circuit at a second sampling frequency, acquires the current accumulation energy based on the second current signal, and sends a first control signal to the first drive module when the current accumulation energy exceeds a preset energy threshold. The current accumulation energy is the sum of the energy generated by each of the second current signals acquired within a preset time period. The first drive module receives the first control signal sent by the control module and, in response to the first control signal, controls the first switch module to turn off. This scheme amplifies the input current of the first switch module by different factors through the current amplification module, and allows the control module to sample the amplified input current at two different sampling frequencies to obtain the required first and second current signals. This allows the control module to perform different processing based on different current signals, meeting the needs of both high-frequency and low-frequency sampling scenarios, providing two types of protection, and improving the adaptability of the circuit breaker control system to different load scenarios.

[0036] In one possible implementation, the first and second amplifier circuits included in the aforementioned current amplification module can be connected in two ways.

[0037] Please refer to Figure 2 This illustration shows a schematic diagram of the circuit structure of a current amplification module in a circuit breaker control system provided by an exemplary embodiment of this application, in which the first amplification circuit and the second amplification circuit are respectively connected to the input terminal of the first switching module. Figure 2 As shown, the circuit breaker control system 200 includes: a current amplification module 201, a control module 202, a first drive module 203, and a first switch module 204.

[0038] The connection relationships of the current amplification module 201, control module 202, first drive module 203, and first switch module 204 are as follows: Figure 1 The same applies to the above, so I will not repeat it here.

[0039] In this embodiment, the current amplification module 201 includes a first amplification circuit 205 and a second amplification circuit 206. The input terminal of the first amplification circuit 205 is electrically connected to the input terminal of the first switch module 204 through a first resistor R1 in the circuit. The output terminal of the first amplification circuit 205 is electrically connected to one input terminal (P1 terminal) of the control module 202. That is, the connection between the first amplification circuit 205 and the input terminal of the first switch module 204 through the first resistor R1 in the circuit realizes the amplification of the input current of the first switch module 204 by a first amplification factor. The first amplification circuit 205 transmits the amplified current to the control module 202 through its own output terminal. The first resistor R1 can be regarded as a shunt sampling resistor connected in series with the input bus of the first switch module 204 in the circuit breaker control system 200. The current amplification module uses the current flowing through this shunt sampling resistor to represent the input current of the first switch module 204.

[0040] In the above Figure 2 In the circuit, the input terminal of the second amplifier circuit 206 is electrically connected to the input terminal of the first switch module 204 via the first resistor R1 in the circuit. The output terminal of the second amplifier circuit 206 is electrically connected to the other input terminal (P2 terminal) of the control module 202. That is, the second amplifier circuit 206 amplifies the input current of the first switch module 204 by a second amplification factor through the connection between the first resistor R1 in the circuit and the input terminal of the first switch module 204. The second amplifier circuit 206 transmits the amplified current to the control module 202 through its own output terminal.

[0041] Optional, please refer to Figure 3 It illustrates an exemplary embodiment of this application relating to Figure 2 A schematic diagram of the circuit structure of an amplifier circuit. Figure 3 The structure of the amplifier circuit 300 shown can be applied to both the first amplifier circuit 205 and the second amplifier circuit 206. That is, both can use the same circuit structure, but with different amplification factors. In actual connection, Figure 3 The first input terminal I of the intermediate amplifier circuit P It can be connected to the left side of the first resistor R1, the second input terminal I N It can be connected to the right side of the first resistor R1, thereby achieving connection with the input terminal of the first switching module, while the input terminal I of the amplifier circuit... OUT It can be connected to the input terminal of the control module. Figure 3 The values ​​of each resistor, capacitor, and first reference voltage VREF1 can be set according to actual needs, and this application does not limit them.

[0042] Please refer to Figure 4 This illustration shows a schematic diagram of the circuit structure of a second amplification circuit of a current amplification module in a circuit breaker control system provided by an exemplary embodiment of this application, in which the second amplification circuit is indirectly connected to the input terminal of a first switching module through a first amplification circuit. Figure 4 As shown, the circuit breaker control system 400 includes: a current amplification module 401, a control module 402, a first drive module 403, and a first switch module 404.

[0043] The connection relationships of the current amplification module 401, control module 402, first drive module 403, and first switch module 404 are as follows: Figure 1 The same applies to the above, so I will not repeat it here.

[0044] With the above Figure 2 The difference is that in this embodiment, the first amplifier circuit 405 and the second amplifier circuit 406 included in the current amplification module 401 are directly connected. For example... Figure 4 As shown, the input terminal of the first amplifier circuit 405 is electrically connected to the input terminal of the first switching module 404, the output terminal of the first amplifier circuit 405 is electrically connected to the control module 402, and the output terminal of the first amplifier circuit 405 is also electrically connected to the input terminal of the second amplifier circuit 406. The output terminal of the second amplifier circuit 406 is also electrically connected to the control module 402. That is, in Figure 4 In this circuit, the output terminal of the first amplifier circuit 405 is electrically connected to one input terminal (P3 terminal) of the control module 402, and is also connected to the input terminal of the second amplifier circuit 406.

[0045] Optionally, the first amplifier circuit 405 is also used to transmit the amplified input current of the first switching module 104 to the second acquisition circuit 406, which amplifies the current based on the amplification of the first amplifier circuit 405.

[0046] In other words, the first amplifier circuit 405, through its connection with the input terminal of the first switch module 404, amplifies the input current of the first switch module 204 by a first amplification factor. When the first amplifier circuit 405 transmits the amplified current to the control module 402 through its own output terminal, the first amplifier circuit 405 also provides the amplified current to the second amplifier circuit 406 through its own output terminal. The input terminal of the second amplifier circuit 406 receives the amplified current and amplifies the current output by the first amplifier circuit 405 again based on the second amplification factor. The output terminal of the second amplifier circuit 406 is electrically connected to another input terminal (P4 terminal) of the control module 402, and the second amplifier circuit 406 sends the amplified current to the control module 402 through its own output terminal.

[0047] Optional, please refer to Figure 5 It illustrates an exemplary embodiment of this application relating to Figure 4 A schematic diagram of the circuit structure of an amplifier circuit. Figure 5 The structure of the amplifier circuit 500 shown can be applied to the above. Figure 4 The second amplifier circuit 406. That is, in Figure 4 In the architecture, the second amplifier circuit 406 needs to use Figure 5 The circuit structure is shown. Here, IS represents the current amplified by the first amplifier circuit after amplifying the input current of the first switching module, and IL represents the current amplified by the second amplifier circuit after amplifying IS. In actual connection, the first amplifier circuit adopts... Figure 3 In the structure, the input terminal of the second amplifier circuit can be directly connected to the output terminal of the first amplifier circuit, and the input terminal of the second amplifier circuit can also be directly connected to the input terminal of the control module. Figure 5 The values ​​of each resistor and the second reference voltage VREF2 can also be set according to actual needs, and this application does not limit them.

[0048] Optionally, the control module can receive the amplified current through different input ports and execute the corresponding processing logic.

[0049] In one possible implementation, the control module can have two analog-to-digital converters (ADCs). One ADC receives the current from the first amplifier circuit, and the other receives the current from the second amplifier circuit. The control module sets one ADC to high-frequency sampling and the other to low-frequency sampling, thereby acquiring the first and second current signals. For example, the control module includes a first ADC unit and a second ADC unit. The input of the first ADC unit is connected to the output of the first amplifier circuit, and the input of the second ADC unit is connected to the output of the second amplifier circuit. The control module acquires the current signal from the first amplifier circuit based on a first sampling frequency through the first ADC unit, and acquires the current signal from the second amplifier circuit based on a second sampling frequency through the second ADC unit.

[0050] Optionally, the first sampling frequency can be set to 100kHz, and the second sampling frequency can be set to 6kHz.

[0051] It should be noted that, in addition to the method of acquiring the signal of the current transmitted by the first amplifier circuit based on the first sampling frequency through the first ADC unit and acquiring the signal of the current transmitted by the second amplifier circuit based on the second sampling frequency through the second ADC unit, the control module described above can also acquire the signal of the current transmitted by the first amplifier circuit based on the second sampling frequency through the first ADC unit and the signal of the current transmitted by the second amplifier circuit based on the first sampling frequency through the second ADC unit. In this case, the first current signal obtained by the control module is the current signal acquired by the second ADC unit based on the first sampling frequency, and the second current signal obtained by the control module is the current signal acquired by the first ADC unit based on the second sampling frequency. The control module can still perform subsequent processing according to the processing logic for the first current signal and the processing logic for the second current signal. That is to say, the first ADC unit can use either the first sampling frequency or the second sampling frequency; similarly, the second ADC unit can use either the first sampling frequency or the second sampling frequency. In this scheme, the control module does not limit which sampling frequency to use for sampling the current output by the two amplifier circuits.

[0052] Optionally, for the above Figure 2 or Figure 4 In addition to the connection structure, the control module is also used to, upon acquiring a first current signal, calculate the cumulative number of times the first current signal continuously exceeds a preset current range, and send a first control signal to the first drive module if the cumulative number exceeds a preset threshold. The control module is also used to, upon acquiring a second current signal, calculate the accumulated current energy based on the second current signal, and send a first control signal to the first drive module if the accumulated current energy exceeds a preset energy threshold.

[0053] For example, the control module includes a first counter. The control module detects the acquired first current signal within a preset current range. Each time the first current signal exceeds the preset current range, the counter's count is incremented by 1, thus accumulating the number of times the acquired first current signal continuously exceeds the preset current range. Furthermore, after updating the accumulated count, the control module continues to detect the accumulated count. If the accumulated count exceeds a preset threshold, a first control signal is sent to the first drive module. High-frequency sampling is achieved through a first amplification circuit, which can be used to detect short-circuit current and trigger short-circuit current protection.

[0054] For example, let Count represent the counting result of the first counter. Taking the preset current range of [A1, A2] as an example, if the first current signal is not within the range of [A1, A2], it means the first current signal exceeds the preset current range, and Count = Count + 1. If the first current signal is within the range of [A1, A2], it means the first current signal does not exceed the preset current range, and Count = Count. After each update of the accumulated count, if the control module finds that Count is greater than the preset count threshold, it sends a first control signal to the first drive module.

[0055] For the acquired second current signal, the control module can calculate the energy generated by the second current signal using a fast-blowout inverse-time algorithm. For example, the calculation formula for the fast-blowout inverse-time algorithm is as follows: ; Where 5.0625 is the constant of the selected curve characteristic, I is the current value indicated by the currently acquired second current signal, Ir is the setting current, and Tr is the setting time. The protection time T under different current levels can be calculated using this formula.

[0056] In this scheme, I is used 4 The energy generated by the currently acquired second current signal can be deduced from I using the calculation formula of the aforementioned fast-blowout inverse-time algorithm. 4 The accumulated energy from the acquired current is represented by E. all In other words, E all = I1 4 +I2 4 + I3 4 +……+ I n 4 Where n is the total number of second current signals collected within the preset time period. In other words, for each second current signal collected by the control module within the preset time period, the control module will calculate the corresponding cumulative current energy E. all And accumulate energy E from the current all Compared with a preset energy threshold, the accumulated energy E at the current is... all If the energy level exceeds the preset energy threshold, a first control signal is sent to the first drive module.

[0057] Optionally, the aforementioned preset energy threshold can be pre-set by the developers, or it can be calculated by the control module based on the last acquired second current signal. For example, using E... total Representing a preset energy threshold, E can be used after each acquisition of the second current signal. total = I n 4*5.0625*Tr is used to calculate the preset energy threshold, and then E all With E total After comparison, if E all >E total Then, a first control signal is sent to the first drive module.

[0058] Optionally, the actions of the first drive module in response to the first control signal can be referred to the above. Figure 1 The description in the text will not be repeated here.

[0059] In summary, in the circuit breaker control system provided in this application, the control module samples the current output from the first and second amplifier circuits respectively through two ADC units to obtain the required first and second current signals. This allows the control module to perform different processing based on different current signals, satisfying the needs of both high-frequency and low-frequency sampling scenarios and providing two types of protection. This improves the adaptability of the circuit breaker control system to different load scenarios. Furthermore, the use of dual ADC units saves storage space in the control module, reduces the amount of data that needs to be transmitted internally, and decreases the computational load in the software control process.

[0060] Below, in addition to the two software protection methods mentioned above, the circuit breaker control system can also provide at least one hardware circuit protection scheme by adding circuit structure. Please refer to... Figure 6 This illustration shows a schematic diagram of the circuit structure of a circuit breaker control system provided in an exemplary embodiment of this application. Figure 6 As shown, the circuit breaker control system 600 includes: a current amplification module 601, a control module 602, a first drive module 603, a first switch module 604, a first detection module 605, a second detection module 606, and a second switch module 607.

[0061] The connection relationships of the current amplification module 601, control module 602, first drive module 603, and first switch module 604 are as follows: Figure 1 or Figure 2 or Figure 3 The same as in, here is with Figure 3 The structure in the example is shown.

[0062] In this embodiment, the circuit breaker control system 600 further includes a first detection module 605. The first input terminal of the first detection module 605 is electrically connected to the input terminal of the first switch module 604, the second input terminal of the first detection module 605 is electrically connected to the output terminal of the first switch module 604, and the output terminal of the first detection module 605 is also electrically connected to the first drive module 603.

[0063] The first detection module 605 is used to acquire a first voltage signal and send a second control signal to the first drive module 603 when the first voltage signal is greater than a first voltage threshold. The first voltage signal is the voltage signal between the input and output terminals of the first switch module 604. The first drive module 603 is also used to receive the second control signal sent by the first detection module 605 and, in response to the second control signal, control the first switch module 604 to turn off.

[0064] In practical applications, the first switch module 604 is used to either connect or disconnect the live wire in the AC power supply system. For example, to disconnect the live wire in the AC power supply system from the middle, the first switch module 604 connects to the disconnected end of the live wire via its first terminal and to the other disconnected end via its second terminal. When the first switch module 604 is on, the live wire is also connected by the first switch module 604; when the first switch module 604 is off, the live wire is also disconnected by the first switch module 604. When the first switch module 604 is on, the AC power supply system supplies power to the subsequent load circuit through the first switch module 604. In the above embodiments, the current amplification module 601 amplifies the AC current input from the AC power supply system to the first switch module 604.

[0065] When the first switch module 604 is in the ON state, the first detection module 605 can be used to acquire the voltage signal (i.e., the first voltage signal) between the input and output terminals of the first switch module 604, and detect the acquired first voltage signal. If the first voltage signal is greater than the first voltage threshold, a second control signal is sent to the first drive module 603. The first drive module 603 responds to the second control signal and controls the first switch module 604 to turn off.

[0066] For example, the second control signal can be a low-level signal. Under normal operation, the first switch module 604 is usually in a conducting state. The first detection module 605 collects the first voltage signal across the two ends of the live wire connected to the first switch module 604, judges the first voltage signal, and if the first voltage signal is greater than a preset voltage threshold, it indicates that a short circuit has occurred in the load or subsequent circuit connected to the live wire. The first drive module 603 then outputs a low-level signal to the first drive module 603. The first drive module 603 responds to this low-level signal by sending a corresponding drive signal to the control terminal of the first switch module 604, thereby controlling the first switch module 604 to turn off, disconnecting the live wire, and providing timely short-circuit protection. This hardware short-circuit protection process implemented by the first detection module 605 can be considered as short-circuit protection triggered by desaturation detection technology, without the need for the intervention of the control module 602. The short-circuit protection process is entirely implemented by the hardware outputting the corresponding signal.

[0067] Optionally, in the above Figure 6 In this circuit breaker control system 600, a second detection module 606 is further included. The input terminal of the second detection module 606 is electrically connected to the input terminal of the first switch module 604, and the output terminal of the second detection module 606 is electrically connected to the first drive module 603. The second detection module 606 is used to acquire the input current of the first switch module 604 to obtain a third current signal, and when the third current signal is greater than a first current threshold, it sends a third control signal to the first drive module 603. The first drive module 603 is also used to receive the third control signal sent by the second detection module 606 and, in response to the third control signal, control the first switch module 604 to turn off.

[0068] In other words, when the first switch module 604 is in the ON state, the second detection module 606 can collect the input current at the input terminal of the first switch module 604 to obtain a third current signal. The second detection module 606 then detects this third current signal. If the third current signal exceeds a first current threshold, it sends a third control signal to the first drive module 603. The first drive module 603 responds to this third control signal by controlling the first switch module 604 to turn off. This hardware short-circuit protection implemented by the second detection module 606 does not require the intervention of the control module 602; the short-circuit protection process is entirely achieved by the hardware outputting the corresponding signal.

[0069] Optionally, the second detection module 606 can also be electrically connected to the control module 602 via port e. Through this connection, the second detection module 606 informs the control module 602 of its current operating status. For example, the operating status includes a first operating status and a second operating status. The first operating status indicates that the second detection module 606 outputs a high-level signal to the first drive module 603, while the second operating status indicates that the second detection module 606 outputs a low-level signal (which can serve as a third control signal) to the first drive module 603. The second detection module 606 can inform the control module 602 of its current operating status by transmitting a status flag. If the status flag is 1, it indicates the first operating status; if the status flag is 0, it indicates the second operating status.

[0070] Optionally, after obtaining the status flag bit of the second detection module 606, the control module 602 can determine the current working status of the second detection module 606, and in response to the status flag bit = 0, can stop the above-mentioned operation. Figure 2 or Figure 3 The solution involves collecting the current supplied by the two amplifier circuits, thus avoiding unnecessary calculations by the control module 602 and improving the overall protection efficiency of the system.

[0071] Optionally, in the above Figure 6 In this configuration, the first switching module 604 includes a first MOSFET Q1 and a second MOSFET Q2; the source of the first MOSFET Q1 and the source of the second MOSFET Q2 are connected, and the gate of the first MOSFET Q1 and the gate of the second MOSFET Q2 are connected; a first terminal of the first switching module 604 is connected to the drain of the first MOSFET Q1, and a second terminal of the first switching module 604 is connected to the drain of the second MOSFET Q2; a first node X1 exists between the gate of the first MOSFET Q1 and the gate of the second MOSFET Q2, and the control terminal of the first switching module 604 is connected to the first node X1; the first switching module 604 is connected to the first driving module 603 through the control terminal. That is, Figure 6 The first switch module 604 is composed of two reverse-connected MOSFETs (common source connection), which simultaneously turn on and off to achieve the conduction and cut-off of the live wire.

[0072] Optionally, in the above Figure 6 In this configuration, the first driving module 603 may include a logic protection circuit 603a and a first driving unit 603b. The first input terminal a of the logic protection circuit 603a is electrically connected to the output terminal of the control module 602, the second input terminal b of the logic protection circuit 603a is electrically connected to the output terminal of the first detection module 605, and the third input terminal c of the logic protection circuit 603a is electrically connected to the output terminal of the second detection module 606. The output terminal of the logic protection circuit 603a is electrically connected to the input terminal of the first driving unit 603b, and the output terminal of the first driving unit 603b is electrically connected to the control terminal of the first switching module 604.

[0073] When the first drive module 603 controls the first switch module 604 to turn off, it can do the following: When it receives a first control signal output from the control module 602 via the first input terminal a, or when it receives a second control signal output from the first detection module 605 via the second input terminal b, or when it receives a third control signal output from the second detection module 606 via the third input terminal c, the logic protection circuit 603a integrates the signals from the three input terminals and determines that the signal provided from the output terminal of the logic protection circuit 603a to the input terminal of the first drive unit 603b is a low-level signal. In response to this low-level signal, the first drive unit 603b outputs a first drive signal to the control terminal of the first switch module 604, thereby controlling... Figure 6 The two MOSFETs in the circuit are in the off state, cutting off the live wire in the AC power supply system.

[0074] Optionally, when the output of the logic protection circuit 603a provides a low-level signal to the input of the first driving unit 603b, the first driving unit 603b can also output a low-level signal to the control terminal of the first switching module 604, controlling Q1 and Q2 in the first switching module 604 to be in the off state.

[0075] Optionally, the circuit breaker control system 600 further includes a second switch module 607, which is electrically connected to the power line in the AC power supply system used to supply power to the load. The power line in the AC power supply system can refer to the live wire and neutral wire mentioned above. The second switch module 607 is used to control the power line to turn off after the first switch module 604 is turned off; the second switch module 607 is also used to control the power line to turn on before the first switch module 604 is turned on.

[0076] In other words, the second switch module 607 can shut off the power line in the AC power supply system again after the first switch module 604 has been turned off, providing a dual shutdown scheme and increasing the safety of protection. Moreover, the second switch module 607 can also control the power line to conduct before the first switch module 604 is turned on, reducing the arc generated in the circuit and consolidating the stability of the system.

[0077] As mentioned above Figure 6As shown, the second switch module 607 may include a second drive unit 607a, a first switch unit 607b, and a second switch unit 607c. The first switch unit 607b is connected to the live wire in the AC power supply system, and the second switch unit 607c is connected to the neutral wire in the AC power supply system. The input terminal of the second drive unit 607a is electrically connected to one output terminal of the control module 602, and the output terminal of the second drive unit 607a is electrically connected to the first switch unit 607b and also electrically connected to the second switch unit 607c. After the first drive module 603 controls the first switch module 604 to turn off, the control module 602 can send a fifth control signal to the second drive unit 607a. In response to the fifth control signal, the second drive unit 607a sends a third drive signal to the first switch unit 607b and the second switch unit 607c, thereby controlling the first switch unit 607b and the second switch unit 607c to also turn off. When the first drive module 603 controls the first switch module 604 to be turned on, the control module 602 can send a sixth control signal to the second drive unit 607a before the first switch module 604 is turned on. In response to the sixth control signal, the second drive unit 607a sends a fourth drive signal to the first switch unit 607b and the second switch unit 607c, thereby controlling the first switch unit 607b and the second switch unit 607c to be closed, thereby controlling the power lines (live wire and neutral wire) to be turned on before the first switch module 604 is turned on.

[0078] Optionally, the second drive unit 607a described above can be implemented using a relay, for example, in the above... Figure 6 This is equivalent to using an L / N relay. When the first switch module 604 is turned off, the L / N relay will also trigger the first switch unit 607b and the second switch unit 607c to open. This ensures that there is no current when the relay is open, increasing the relay's lifespan. When the first switch module 604 needs to be turned on, the relay first controls the first switch unit 607b and the second switch unit 607c to close, and then closes Q1 and Q2 in the first switch module 604 to turn it on. This way, the relay will not generate an electric arc when the first switch module 604 is turned on, making the entire control system more stable and achieving an arc-free switching effect.

[0079] In summary, in the circuit breaker control system provided in this application, the control module samples the current output from the first amplifier circuit and the second amplifier circuit through two ADC units to obtain the required first current signal and second current signal. This allows the control module to perform different processing based on different current signals, which can meet the needs of both high-frequency sampling and low-frequency sampling scenarios, provide two types of protection, and improve the adaptability of the circuit breaker control system to different load scenarios.

[0080] In addition, two types of hardware short-circuit protection are provided: a first detection module and a second detection module. The first module directly measures the voltage across the first switching module and the AC current input to it, resulting in a faster overall response and improved short-circuit protection efficiency. Furthermore, the second switching module provides dual-switch control, ensuring complete power disconnection to the load after the first switching module is turned off. This prevents leakage when Q1 and Q2 in the first switching module are turned off and also avoids electric shock caused by users reversing the L and N connections of the relays, thus enhancing the safety of the circuit breaker control system.

[0081] In one possible implementation, the circuit breaker control system provides overvoltage protection, undervoltage protection, and leakage current protection. Please refer to [reference needed]. Figure 7 This illustration shows a schematic diagram of the circuit structure of a circuit breaker control system provided in an exemplary embodiment of this application. Figure 7 As shown, the circuit breaker control system 700 includes: a current amplification module 701, a control module 702, a first drive module 703, a first switch module 704, a first detection module 705, a second detection module 706, a second switch module 707, a first sampling module 708, and a second sampling module 709.

[0082] The connection relationships and functions of the current amplification module 701, control module 702, first drive module 703, first switch module 704, first detection module 705, second detection module 706, and second switch module 707 can be referred to the above. Figure 6 The description will not be repeated here.

[0083] In this embodiment, the circuit breaker control system 700 further includes a first sampling module 708, which is electrically connected to the control module 702. The first sampling module 708 is used to acquire a second voltage signal and send the second voltage signal to the control module 702. The second voltage signal is the voltage signal input by the AC power supply system to the circuit breaker control system. The control module 702 is also used to send a first control signal to the first drive module 703 when the second voltage signal is greater than a second voltage threshold. The control module 702 is also used to send a first control signal to the first drive module when the second voltage signal is less than a third voltage threshold.

[0084] For example, the control module 702 also includes a second voltage threshold and a third voltage threshold. The second voltage threshold is greater than the third voltage threshold. The first sampling module 708 collects the voltage signal input from the AC power supply system to the circuit breaker control system to obtain the second voltage signal. The control module 702 detects this second voltage signal. If the second voltage signal is greater than the second voltage threshold, it indicates that the voltage supplied by the AC power supply system to the circuit breaker control system is too high, posing an overvoltage risk, and overvoltage protection needs to be triggered. In this embodiment, the control module 702 can send a first control signal to the first drive module 703, causing the first drive module 703 to respond to the first control signal and control the first switch module 704 to turn off. If the second voltage signal is less than the third voltage threshold, it indicates that the voltage supplied by the AC power supply system to the circuit breaker control system is too low, posing an undervoltage risk, and undervoltage protection needs to be triggered. The control module 702 can also send a first control signal to the first drive module 703, causing the first drive module 703 to respond to the first control signal and control the first switch module 704 to turn off.

[0085] Please refer to Figure 8 This illustrates a schematic diagram of the circuit structure of a first sampling module provided in an exemplary embodiment of this application. Figure 8 As shown, the first sampling module 800 includes a first input terminal 801, a second input terminal 802, and an output terminal 803. The first input terminal 801 can be connected to the live wire of the AC power supply system, the second input terminal 802 can be connected to the neutral wire of the AC power supply system, and the output terminal 803 is used to connect to the control module. Figure 8 The internal circuit structure shown allows the first sampling module 800 to collect the input voltage of the AC power supplied by the AC power supply system and transmit the collected input voltage (i.e., the second voltage signal) to the control module through the output terminal 803. Figure 8 The values ​​of each resistor, capacitor, and third reference voltage VREF3 can be set according to actual needs, and this application does not limit them.

[0086] Optionally, in the above Figure 7In the illustrated scheme, the control module 702 is further configured to generate a zero-crossing signal based on the second voltage signal after receiving it. The zero-crossing signal is used to indicate that the voltage signal input from the AC power supply system to the circuit breaker control system drops to zero. The control module 702 is also configured to send a fourth control signal to the first drive module 703 in response to the generation of the zero-crossing signal. The first drive module 703 is further configured to receive the fourth control signal sent by the control module 702 and, in response to the fourth control signal, control the first switch module 704 to turn on. In other words, the control module 702 can also perform zero-crossing detection based on the received second voltage signal (i.e., the input voltage provided by the AC power supply system to the circuit breaker control system). When a zero-crossing is detected, it can generate a corresponding zero-crossing signal, thereby controlling the sending of a fourth control signal to the first drive module 703 to turn on the first switch module 704.

[0087] Optionally, the control module 702 can, upon generating a zero-crossing signal, send a fourth control signal to the first drive module 703 to turn on the first switch module 704, which can be considered a soft-start based on PWM. In practical applications, the control module 702 can also send a fourth control signal to the first drive module 703 to turn on the first switch module 704 when the second voltage signal is at a lower voltage level (e.g., a fourth voltage threshold, which is greater than the third voltage threshold). For example, if the first switch module 704 is as described above... Figure 6 Taking the structure in the example, the fourth control signal can be a high-level signal. When the first drive module 703 receives the high-level signal sent by the control module 702, the first drive module 703 can output the second drive signal (or a high-level signal) to the control terminal of the first switch module, thereby controlling the two MOS transistors in the first switch module to be in the conducting state and turning on the live wire in the AC power supply system.

[0088] Optionally, the circuit breaker control system 700 further includes a second sampling module 709, which is electrically connected to the control module 702. The second sampling module 709 is used to acquire a fourth current signal and send it to the control module 702. The fourth current signal is the leakage current signal between the neutral and live wires in the AC power supply system. The control module 702 is also used to send a first control signal to the first drive module 703 when the fourth current signal is greater than a second current threshold. In other words, the circuit breaker control system 700 provided in this solution also has the function of detecting leakage current signals. It acquires the leakage current signal between the neutral and live wires in the AC power supply system through the second sampling module 709 and sends it to the control module 702. When the control module 702 determines that the fourth current signal is greater than the second current threshold, it sends a first control signal to the first drive module 703.

[0089] exist Figure 7 In this circuit, the second sampling module 709 comprises a second resistor R2, a push-button switch K1, a zero-sequence current transformer (ZCT), and a current sampling unit. The neutral and live wires of the AC power supply system pass through the ZCT and supply power to subsequent circuits. When leakage occurs in the subsequent circuits or load, the ZCT will sense a corresponding leakage current. This leakage current signal is collected by the current sampling unit 709a and transmitted to the control module 702 for processing. If the fourth current signal exceeds a second current threshold, the control module 702 sends a first control signal to the first drive module 703, causing the first switch module 704 to turn off. The combination of this second sampling unit and the MCU primarily functions to detect leakage current (also known as residual current). The second resistor R2 and the push-button switch K1 form the test circuit for the second sampling module.

[0090] Please refer to Figure 9 The diagram illustrates a circuit structure schematic of a current sampling unit according to an exemplary embodiment of this application. Figure 9 As shown, the two input terminals Coil1 and Coil2 of the current sampling unit 900 can be connected to the two output terminals of the ZCT respectively. The output terminal of the current sampling unit 900 is connected to the control module and can output the acquired fourth current signal Ileak (i.e. leakage current) to the control module. Figure 9 The values ​​of each resistor, capacitor, and fourth reference voltage VREF4 can be set according to actual needs, and this application does not limit them.

[0091] Optionally, the control module can also perform detection through the aforementioned low-frequency sampling, and can also perform current compensation on the zero-sequence current transformer to prevent the leakage protection from malfunctioning due to excessive subsequent load current when the control module does not trigger the sending of the first control signal to the first drive module during the verification of the second current signal. Compared with conventional designs, this circuit breaker control system can save the shielding cover of the zero-sequence current transformer.

[0092] Optional, in Figure 7 The circuit breaker control system 700 also includes a communication module 710 and a temperature detection module 711. The communication module 710 is directly connected to the control module 702, enabling the circuit breaker control system 700 to communicate with external systems. The temperature detection module 711 is also directly connected to the control module 702 and is used to detect the temperature of the two MOSFETs (Q1 and Q2) in the first switching module 704, preventing the entire system from overheating.

[0093] Please refer to Figure 10The diagram illustrates a circuit structure schematic of a temperature detection module according to an exemplary embodiment of this application. Figure 10 As shown, the temperature detection module 1000 includes a thermistor 1001, which detects the temperature of Q1 and Q2 via an operational amplifier voltage follower. In other words, the thermistor 1001 senses temperature changes, and its resistance value can be used as a signal input to the temperature detection module 1000. The output of the temperature detection module 1000 is connected to a control module, which can output a collected voltage signal to the control module in response to the resistance value of the thermistor 1001. This voltage signal indicates the change in temperature (Temp). Figure 10 The values ​​of each resistor and capacitor can also be set according to actual needs.

[0094] It should be noted that this embodiment uses a single-phase AC power supply system as an example. In practical applications, it can also be applied to multi-phase AC power supply systems; there is no limitation here. Moreover, the various current or voltage thresholds required in each embodiment can be preset by the developers.

[0095] In summary, in the circuit breaker control system provided in this application, the control module samples the current output from the first amplifier circuit and the second amplifier circuit through two ADC units to obtain the required first current signal and second current signal. This allows the control module to perform different processing based on different current signals, which can meet the needs of both high-frequency sampling and low-frequency sampling scenarios, provide two types of protection, and improve the adaptability of the circuit breaker control system to different load scenarios.

[0096] In addition, this solution enables the circuit breaker control system to provide overvoltage and undervoltage protection functions by adding a first sampling module, and enables the circuit breaker control system to provide leakage current protection function by adding a second sampling module, which greatly increases the protection that the circuit breaker control system can provide.

[0097] In addition, the control module detects zero-crossing points and generates corresponding zero-crossing signals. During soft-start, Q1 and Q2 are turned on when the input voltage crosses zero. After the PWM is activated, different ADC units in the control module are triggered to sample. If none of the aforementioned protections are triggered, Q1, Q2, and the second switching module will be fully turned on. If any protection is triggered, it will be turned off again immediately, and a fault alarm will be activated. This control method can reduce the user's cost for selecting circuit breakers. For example, in factory lighting, when a user turns on multiple light-emitting diode (LED) lights at once, traditional mechanical circuit breakers require higher current ratings due to the capacitive load during startup. However, the circuit breaker control system using this solution can use circuit breakers with lower current ratings, and the slow startup of the system improves the stability of the entire power supply system.

[0098] Optionally, this application also provides a solid-state circuit breaker that includes at least one circuit breaker control system as described in the various embodiments above.

[0099] It should be noted that the circuits provided in the above embodiments are only illustrative examples of the division of functional modules when performing control. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The accompanying drawings provided in each embodiment can be used in combination with each other.

[0100] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0101] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0102] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A circuit breaker control system, characterized in that, The circuit breaker control system includes: a current amplification module, a control module, a first drive module, and a first switch module; The current amplification module is electrically connected to the control module, the current amplification module is also electrically connected to the first switch module, the control module is also electrically connected to the first drive module, and the first drive module is also electrically connected to the first switch module. The current amplification module includes a first amplification circuit and a second amplification circuit. The first amplification circuit is used to amplify the input current of the first switching module based on a first amplification factor and transmit it to the control module. The second sampling circuit is used to amplify the input current of the first switching module based on a second amplification factor and transmit it to the control module. The first amplification factor and the second amplification factor are different. The control module is used to acquire the current transmitted by the first amplifier circuit at a first sampling frequency to obtain a first current signal, acquire the cumulative number of times the first current signal exceeds a preset current range, and send a first control signal to the first drive module when the cumulative number is greater than a preset number threshold. The control module is also used to acquire the current transmitted by the second amplifier circuit at the second sampling frequency to obtain a second current signal, acquire the current accumulation energy based on the second current signal, and send the first control signal to the first drive module when the current accumulation energy is greater than a preset energy threshold. The current accumulation energy is the sum of the energy generated by each of the second current signals acquired within a preset time period. The first drive module is used to receive a first control signal sent by the control module, and in response to the first control signal, control the first switch module to turn off.

2. The circuit breaker control system according to claim 1, characterized in that, The input terminal of the first amplifier circuit is electrically connected to the input terminal of the first switching module, the output terminal of the first amplifier circuit is electrically connected to the control module, and the output terminal of the first amplifier circuit is also electrically connected to the input terminal of the second amplifier circuit. The first amplifier circuit is also used to transmit the amplified input current of the first switching module to the second amplifier circuit.

3. The circuit breaker control system according to claim 1, characterized in that, The circuit breaker control system further includes a first detection module, the first input terminal of the first detection module is electrically connected to the input terminal of the first switch module, the second input terminal of the first detection module is electrically connected to the output terminal of the first switch module, and the output terminal of the first detection module is also electrically connected to the first drive module. The first detection module is used to acquire a first voltage signal, and when the first voltage signal is greater than a first voltage threshold, to send a second control signal to the first drive module; the first voltage signal is the voltage signal between the input terminal and the output terminal of the first switch module. The first driving module is also configured to receive a second control signal sent by the first detection module, and in response to the second control signal, control the first switch module to turn off.

4. The circuit breaker control system according to claim 1, characterized in that, The circuit breaker control system further includes a second detection module, the input terminal of which is electrically connected to the input terminal of the first switch module, and the output terminal of which is electrically connected to the first drive module. The second detection module is used to collect the input current of the first switch module to obtain a third current signal, and when the third current signal is greater than the first current threshold, it sends a third control signal to the first drive module. The first driving module is also configured to receive a third control signal sent by the second detection module, and in response to the third control signal, control the first switch module to turn off.

5. The circuit breaker control system according to claim 1, characterized in that, The circuit breaker control system further includes a second switch module, which is electrically connected to the power line in the AC power supply system, and the power line in the AC power supply system is used to supply power to the load. The second switch module is used to control the power line to turn off after the first switch module turns off; The second switch module is also used to control the power line to be turned on before the first switch module is turned on.

6. The circuit breaker control system according to claim 1, characterized in that, The circuit breaker control system further includes a first sampling module (for over- and under-voltage protection), which is electrically connected to the control module. The first sampling module is used to acquire the second voltage signal and send the second voltage signal to the control module. The second voltage signal is the voltage signal input by the AC power supply system to the circuit breaker control system. The control module is also configured to send the first control signal to the first drive module when the second voltage signal is greater than the second voltage threshold. The control module is also used to send the first control signal to the first drive module when the second voltage signal is less than the third voltage threshold.

7. The circuit breaker control system according to claim 6, characterized in that, The control module is further configured to generate a zero-crossing signal based on the second voltage signal after receiving the second voltage signal, the zero-crossing signal being used to indicate that the voltage signal input by the AC power supply system to the circuit breaker control system drops to zero; The control module is also configured to send a fourth control signal to the first drive module in response to generating the zero-crossing signal; The first driving module is also used to receive a fourth control signal sent by the control module, and in response to the fourth control signal, control the first switching module to turn on.

8. The circuit breaker control system according to claim 1, characterized in that, The circuit breaker control system further includes a second sampling module (to realize leakage protection, i.e., residual current detection), and the second sampling module is electrically connected to the control module; The second sampling module is used to acquire the fourth current signal and send the fourth current signal to the control module. The fourth current signal is the leakage current signal between the neutral wire and the live wire in the AC power supply system. The control module is also configured to send the first control signal to the first drive module when the fourth current signal is greater than the second current threshold.

9. The control circuit according to claim 1, characterized in that, The first switching module includes a first MOSFET and a second MOSFET; The source of the first MOSFET is connected to the source of the second MOSFET, and the gate of the first MOSFET is connected to the gate of the second MOSFET. The first terminal of the first switching module is connected to the drain of the first MOSFET, and the second terminal of the first switching module is connected to the drain of the second MOSFET. There is a first node between the gate of the first MOSFET and the gate of the second MOSFET, and the control terminal of the first switching module is connected to the first node. The first switch module is connected to the first drive module through the control terminal.

10. A solid-state circuit breaker, characterized in that, The solid-state circuit breaker includes a circuit breaker control system as described in any one of claims 1 to 9.

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