Intelligent circuit breaker and regenerated energy recovery system

Abstract

The invention relates to an intelligent circuit breaker and a regenerated energy recovery system, and the intelligent circuit breaker comprises an adhesion detection module which is connected with a contact of an external control electric appliance, and provides an adhesion test signal for an adhesion detection loop; the insulation detection module is connected with an external insulation loop and provides an insulation test signal for an insulation detection loop; the fast fuse protection module is connected in series in a direct current main loop of the intelligent circuit breaker; the master control module obtains the adhesion sampling signal from the adhesion detection loop, determines an adhesion diagnosis result of the contact according to the adhesion sampling signal, obtains the insulation sampling signal from the insulation detection loop, determines an insulation diagnosis result of the external insulation loop according to the insulation sampling signal, and sends the insulation diagnosis result to the external insulation loop. Monitoring the state of a fuse unit in the fast fuse protection module, and outputting an alarm signal when the fuse unit is monitored to be fused; extreme short circuit fault response, contact adhesion diagnosis of a control electric appliance in the system and insulation state monitoring of the system can be realized.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to an intelligent circuit breaker and a regenerative energy recovery system. Background Technology

[0002] With the widespread application of regenerative energy recovery systems such as elevators, lifts, and pumping stations, the technical limitations of traditional electrical protection solutions are becoming increasingly prominent. Related technologies often employ a modular architecture of discrete components to build protection systems, which not only suffers from drawbacks such as large size and complex wiring, but also exhibits significant shortcomings in electrical performance. Summary of the Invention

[0003] Therefore, it is necessary to provide an intelligent circuit breaker and regenerative energy recovery system to address the above-mentioned technical problems, which can realize extreme short-circuit fault response, contact adhesion diagnosis of control electrical appliances in the system, and insulation status monitoring of the system.

[0004] In a first aspect, this application provides an intelligent circuit breaker, which includes a main control module and a fast-blow protection module;

[0005] The intelligent circuit breaker also includes an adhesion detection module and / or an insulation detection module;

[0006] The adhesion detection module is connected to the contacts of an external control appliance and is used to provide an adhesion test signal to the adhesion detection circuit connected to the contacts according to the adhesion detection control signal output by the main control module.

[0007] The insulation detection module is connected to an external insulation circuit and is used to provide an insulation test signal to the insulation detection circuit connected to the external insulation circuit according to the insulation detection control signal output by the main control module.

[0008] The fast-blow fuse protection module is connected in the DC main circuit of the intelligent circuit breaker;

[0009] The main control module is connected to the adhesion detection module, the insulation detection module, and the fast-blow protection module respectively; the main control module is used to monitor the status of the fuse unit in the fast-blow protection module and output an alarm signal when the fuse unit is detected to have blown.

[0010] The main control module is also used to acquire adhesion sampling signals from the adhesion detection circuit and determine the adhesion diagnosis result of the contact based on the adhesion sampling signals, and to acquire insulation sampling signals from the insulation detection circuit and determine the insulation diagnosis result of the external insulation circuit based on the insulation sampling signals, and / or, the main control module is also used to monitor the status of the fuse unit in the fast-blow protection module and output an alarm signal when the fuse unit is detected to have blown.

[0011] In one embodiment, the adhesion detection module includes at least a constant current source unit, and the adhesion test signal includes a constant current pulse signal;

[0012] The constant current source unit is used to provide the constant current pulse signal to the adhesion detection circuit according to the adhesion detection control signal;

[0013] The adhesion sampling signal includes the loop voltage value of the adhesion detection circuit;

[0014] The main control module is used to determine the adhesion diagnosis result of the contact point based on the preset voltage threshold and the circuit voltage value.

[0015] In one embodiment, the insulation detection module includes at least a direct digital frequency synthesizer unit, and the insulation test signal includes a waveform excitation signal;

[0016] The direct digital frequency synthesizer unit is used to provide the waveform excitation signal to the insulation detection circuit according to the insulation detection control signal;

[0017] The insulation sampling signal includes the insulation resistance value of the external insulation circuit;

[0018] The main control module is used to determine the insulation diagnosis result of the external insulation circuit based on the preset resistance threshold and the insulation resistance value.

[0019] In one embodiment, the fast-blow protection module includes:

[0020] The fuse unit is connected in series in the DC main circuit of the intelligent circuit breaker;

[0021] A current limiting unit, wherein the first end of the current limiting unit is connected to the first end of the fuse unit;

[0022] An optocoupler unit, wherein a first end of the optocoupler unit is connected to a second end of the current limiting unit, a second end of the optocoupler unit is connected to a second end of the fuse unit, and a third end of the optocoupler unit is connected to the main control module;

[0023] The main control module is used to determine whether the fuse unit is blown or normal based on the output signal of the optocoupler unit.

[0024] In one embodiment, the smart circuit breaker further includes:

[0025] A communication interface module, connected to the main control module, is used to transmit the adhesion diagnosis results, insulation diagnosis results, and alarm signals output by the main control module to an external controller;

[0026] The power management module is used to provide power to the adhesion detection module, the insulation detection module, the fast-blow fuse protection module, the main control module, and the communication interface module, respectively.

[0027] In one embodiment, the smart circuit breaker further includes a metal heat dissipation component;

[0028] The adhesion detection module and the insulation detection module are respectively located inside the corresponding metal shielding cover;

[0029] The main control module and the power management module in the intelligent circuit breaker are each equipped with heat-conducting components.

[0030] Wherein, the heat-conducting component is in contact with the metal shielding cover, or the heat-conducting component is in contact with the metal heat dissipation component;

[0031] The metal shielding cover contacts the metal heat dissipation component through thermally conductive pads.

[0032] In one embodiment, the adhesion detection module includes multiple sets of adhesion detection interfaces, and the contact is connected to the adhesion detection circuit through the adhesion detection interfaces;

[0033] The insulation detection module includes multiple sets of insulation detection interfaces, and the external insulation circuit is connected to the insulation detection circuit through the insulation detection interfaces.

[0034] In one embodiment, the internal circuit of the smart circuit breaker is divided into at least two of the following layers: a power layer, a sensing and driving layer, a control and signal processing layer, and a digital layer.

[0035] The internal space of the intelligent circuit breaker is divided into at least two of the first, second, third, and fourth regions arranged in the same direction;

[0036] The power layer is located in the first region and includes at least the fuse unit, main contact, and primary conductor;

[0037] The sensing and driving layer is located in the second region and includes at least a current transformer and a power isolation circuit.

[0038] The control and signal processing layer is located in the third region and includes at least the main control module, the adhesion detection module, the insulation detection module, the adhesion detection interface, and the insulation detection interface.

[0039] The digital layer is located in the fourth region and includes at least a communication interface module.

[0040] Secondly, embodiments of this application provide a regenerative energy recovery system, which includes an intelligent circuit breaker as described in the first aspect above; the intelligent circuit breaker is disposed on the DC bus side of the regenerative energy recovery system.

[0041] In one embodiment, the regenerative energy recovery system is an elevator, lift, or nodding donkey.

[0042] The aforementioned intelligent circuit breaker and regenerative energy recovery system, by incorporating an adhesion detection module, can connect to the contacts of the control electrical appliances in the regenerative energy recovery system. The adhesion detection module provides adhesion test signals to the adhesion detection circuit connected to the contacts based on the adhesion detection control signal output by the main control module. The main control module can obtain adhesion sampling signals from the adhesion detection circuit and determine the adhesion diagnosis result of the contacts based on the adhesion sampling signals, thereby realizing the contact adhesion diagnosis of the control electrical appliances in the system. Furthermore, by incorporating an insulation detection module, which can connect to the system's insulation circuit, insulation detection... The module can provide insulation test signals to the insulation detection circuit connected to the system insulation circuit based on the insulation detection control signal output by the main control module. The main control module can obtain insulation sampling signals from the insulation detection circuit and determine the insulation diagnosis results of the system insulation circuit based on the insulation sampling signals, thereby realizing the insulation status monitoring of the system. By setting a fast-blow protection module, which is connected in series in the DC main circuit of the smart circuit breaker, the main control module can monitor the status of the fuse unit in the fast-blow protection module and output an alarm signal when the fuse unit is detected to have blown, thereby realizing the response to extreme short-circuit faults. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is one of the structural schematic diagrams of a smart circuit breaker in one embodiment;

[0045] Figure 2 This is a second schematic diagram of the structure of a smart circuit breaker in one embodiment;

[0046] Figure 3 This is an electrical layout diagram of a smart circuit breaker in one embodiment;

[0047] Figure 4 This is a schematic diagram of a regenerative energy recovery system in one embodiment. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0049] It should be noted that the terms "first," "second," etc., used in this application can be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the second element. The terms "comprising" and "having," and any variations thereof, used in this application, are intended to cover non-exclusive inclusion. The term "multiple" used in this application refers to two or more. The term "and / or" used in this application refers to one of the embodiments, or any combination of multiple embodiments.

[0050] The intelligent circuit breaker provided in this application embodiment is applied, for example but not limited to, to a regenerative energy recovery system, which is for example but not limited to elevators, lifts, or nodding donkeys.

[0051] In one exemplary embodiment, reference is made to Figure 1 A smart circuit breaker is provided, which includes a main control module 110 and a fast-blow protection module 140; and the smart circuit breaker also includes at least one of an adhesion detection module 120 and an insulation detection module 130.

[0052] The main control module 110 is connected to the adhesion detection module 120, the insulation detection module 130, and the fast-blow protection module 140 respectively. The main control module 110 can be used to generate adhesion detection control signals and insulation detection control signals. The main control module 110 can also be used to monitor the status of the fuse unit in the fast-blow protection module 140, wherein the status of the fuse unit includes blown or normal.

[0053] As an example, the main control module 110 can be an MCU (Microcontroller Unit) with a high-precision ADC (Analog-to-Digital Converter) and DSP (Digital Signal Processor) core. As an example, the main control MCU can also have a built-in FPU (Floating Point Unit), and the main control MCU can be configured with a digital phase-locked loop (PLL) amplification algorithm. As an example, the main control MCU uses the STM32H743 series MCU.

[0054] The adhesion detection module 120 is connected to the contacts of an external control appliance. The adhesion detection module 120 can provide adhesion test signals to the adhesion detection circuit connected to the contacts based on the adhesion detection control signal output by the main control module 110. The main control module 110 can also acquire adhesion sampling signals from the adhesion detection circuit and determine the adhesion diagnosis result of the contacts based on the adhesion sampling signals.

[0055] As an example, the external control electrical appliance can be an external relay or contactor used in conjunction with the intelligent circuit breaker. The adhesion detection circuit can be composed of the contacts and other circuit components and connecting wires in the adhesion detection module 120; as an example, other circuit components in the adhesion detection module 120 may include a constant current source, a sampling resistor, etc., and the connecting wires can be shielded twisted pair cables, such as RVVP 2x0.75mm² shielded twisted pair cables.

[0056] Within a system safety timeframe (e.g., elevator standby time), the main control module 110 outputs an adhesion detection control signal to the adhesion detection module 120. The adhesion detection module 120 then provides an adhesion test signal to the adhesion detection circuit connected to the contact point based on the control signal. The main control module 110 obtains the adhesion sampling signal from the adhesion detection circuit and determines the adhesion diagnosis result of the contact point based on the sampling signal. The adhesion diagnosis result includes whether the contact is adhered or not. This embodiment of the application thus achieves contact adhesion diagnosis of the control electrical appliances in the system, which helps to avoid safety accidents caused by system malfunctions or energy backflow due to contact adhesion of the control electrical appliances.

[0057] In some exemplary embodiments, the adhesion detection module 120 includes at least a constant current source unit, and the adhesion test signal includes a constant current pulse signal; the constant current source unit is used to provide a constant current pulse signal to the adhesion detection circuit according to the adhesion detection control signal; wherein, the adhesion sampling signal includes the loop voltage value of the adhesion detection circuit; the main control module 110 is also used to determine the adhesion diagnosis result of the contact point according to the preset voltage threshold and the loop voltage value.

[0058] As an example, the adhesion detection module 120 can diagnose contact adhesion of the control electrical appliances in the system based on the pulse resistance measurement method. During the system's safe time (such as the elevator's standby time), the main control module 110 can control the constant current source unit to inject a short, safe constant current pulse signal I into the adhesion detection circuit. The main control module 110 can obtain the circuit voltage value through a high-precision ADC. If the circuit voltage value is close to zero, the adhesion diagnosis result of the contact is determined to be adhesion. If the circuit voltage value V meets the expectation (V = I * R_loop), the adhesion diagnosis result of the contact is determined to be normal, where R_loop refers to the total resistance of the adhesion detection circuit through which the adhesion detection current flows. As an example, the constant current source unit includes a constant current source, and the constant current source is an isolated constant current source. As an example, the constant current source output is configured to 1mA, the pulse width is 10ms, and the preset voltage threshold is configured to 2V, that is, if the circuit resistance is less than 2kΩ, the adhesion diagnosis result of the contact is determined to be adhesion.

[0059] The insulation detection module 130 is connected to an external insulation circuit. This connection allows the module to provide insulation test signals to the insulation detection circuit connected to the external insulation circuit based on the insulation detection control signal output by the main control module 110. The main control module 110 can also acquire insulation sampling signals from the insulation detection circuit and determine the insulation diagnosis result of the external insulation circuit based on these signals. In this way, the intelligent circuit breaker can achieve insulation status monitoring of the system.

[0060] As an example, the external insulation circuit can be an insulation circuit formed by the DC bus and the system reference ground; for example, the insulation detection module 130 is connected to the DC bus, the system casing, or the safety grounding bus, thereby realizing the connection between the insulation detection module 130 and the system insulation circuit. As an example, the insulation detection circuit can be composed of an insulation circuit and other circuit components and connecting wires in the insulation detection module 130; as an example, other circuit components in the insulation detection module 130 may include a bridge circuit, a differential amplifier, etc.

[0061] In some exemplary embodiments, the insulation detection module 130 includes at least a direct digital frequency synthesizer unit, and the insulation test signal includes a waveform excitation signal; the direct digital frequency synthesizer unit is used to provide a waveform excitation signal to the insulation detection circuit according to the insulation detection control signal; wherein, the insulation sampling signal includes the insulation resistance value of the external insulation circuit; the main control module 110 is also used to determine the insulation diagnosis result of the external insulation circuit according to the preset resistance threshold and the insulation resistance value.

[0062] As an example, the insulation detection module 130 can employ an insulation resistance detection scheme based on low-frequency, low-amplitude signal injection. The insulation detection module 130 can generate a waveform excitation signal through a high-precision DDS (Direct Digital Frequency Synthesize) unit and inject it into the DC bus of the system. For example, the excitation square wave frequency is 1Hz, the resistance values ​​of the bridge precision resistors R1 and R2 are both 1MΩ with 1% accuracy, the differential amplifier gain is configured to 100 times, and the preset resistance threshold is configured to 10MΩ. For example, if the insulation resistance value is greater than or equal to the preset resistance threshold, the insulation diagnosis result is determined to be insulation degradation; if the insulation resistance value is less than the preset resistance threshold, the insulation diagnosis result is determined to be normal. The insulation resistance detection range of this embodiment can reach 100KΩ to 50MΩ.

[0063] The fast-blow fuse protection module 140 is connected to the DC main circuit of the smart circuit breaker. The main control module 110 is also used to monitor the status of the fuse unit in the fast-blow fuse protection module 140 and output an alarm signal when the fuse unit is detected to have blown, thereby realizing the response to extreme short-circuit faults. As an example, the fast-blow fuse protection module 140 is connected to the DC main circuit of the smart circuit breaker.

[0064] In some exemplary embodiments, the fast-blow protection module 140 includes: a fuse unit, a current limiting unit, and an optocoupler unit.

[0065] A fuse unit is connected in series in the DC main circuit of the smart circuit breaker. As an example, the fuse unit may include a fast-acting device such as a silver fuse or a copper fuse. The first terminal of the current-limiting unit is connected to the first terminal of the fuse unit. As an example, the current-limiting unit may include a current-limiting resistor. The first terminal of the optocoupler unit is connected to the second terminal of the current-limiting unit, the second terminal of the optocoupler unit is connected to the second terminal of the fuse unit, and the third terminal of the optocoupler unit is connected to the main control module 110. The main control module 110 is also used to determine whether the fuse unit is blown or functioning normally based on the output signal of the optocoupler unit.

[0066] As an example, the fuse is connected in series in the main current path, located upstream or downstream of the main contacts. In the DC main circuit of a smart circuit breaker with a rated current of 200A, a fast-breaking silver fuse with a rated current of 250A can be connected in series, encapsulated in a glass fiber reinforced nylon shell. A monitoring circuit consisting of a 1MΩ resistor and an optocoupler input stage is connected in parallel across the fuse, and the optocoupler output stage is connected to the main control module 110. The output of the optocoupler output stage differs depending on whether the fuse is blown or functioning normally, allowing the main control module 110 to determine the fuse unit status as blown or functioning normally based on the output signal of the optocoupler output stage.

[0067] In one exemplary embodiment, reference continues to... Figure 1 The adhesion detection module 120 includes multiple adhesion detection interfaces, and the contacts are connected to the adhesion detection circuit through the adhesion detection interfaces; the insulation detection module 130 includes multiple insulation detection interfaces, and the external insulation circuit is connected to the insulation detection circuit through the insulation detection interfaces.

[0068] As an example, each set of adhesion detection interfaces includes terminals KP and KN, which are respectively connected to both sides of the contact. As an example, each set of insulation detection interfaces includes terminals ISO_HV+, ISO_HV-, and ISO_GND, wherein terminals ISO_HV+ and ISO_HV- are connected to the DC bus, and terminal ISO_GND is connected to the regenerative energy recovery system housing or safety grounding bus, with a measurement range of 100KΩ-50MΩ.

[0069] In one exemplary embodiment, reference is made to Figure 2 The intelligent circuit breaker also includes: a communication interface module 160 and a power management module 150.

[0070] The communication interface module 160 is connected to the main control module 110. The communication interface module 160 is used to transmit the adhesion diagnosis results, insulation diagnosis results, and alarm signals output by the main control module 110 to an external controller. As an example, the communication interface module 160 can be integrated with an isolated CAN transceiver.

[0071] The power management module 150 provides power to the adhesion detection module 120, insulation detection module 130, fast-blow protection module 140, main control module 110, and communication interface module 160, respectively. As an example, the power management module 150 may employ an isolated DC-DC converter to provide a stable and electrically isolated power supply to all internal circuits of the smart circuit breaker.

[0072] In an exemplary embodiment, the smart circuit breaker further includes a metal heat dissipation component; the adhesion detection module 120 and the insulation detection module 130 are respectively located inside their respective metal shields; the main control module 110 and the power management module 150 in the smart circuit breaker are respectively provided with heat-conducting components; wherein, the heat-conducting component is in contact with the metal shield, or the heat-conducting component is in contact with the metal heat dissipation component; the metal shield is in contact with the metal heat dissipation component through a heat-conducting pad.

[0073] The metal heat dissipation component can be a specially designed metal heat dissipation bridge inside the smart circuit breaker, or the metal casing of the smart circuit breaker. The main control module 110 and the power management module 150 are the main heat-generating components; therefore, heat-conducting components are provided for both the main control module 110 and the power management module 150. For example, the heat-conducting components can be thermal grease or insulating thermal pads, etc.

[0074] The adhesion detection module 120 and the insulation detection module 130 can each be equipped with independent metal shielding covers to shield against electromagnetic interference in a high-voltage environment. As an example, the metal shielding cover is a 0.2mm thick galvanized steel plate shielding cover. The metal shielding cover achieves low-impedance connection to the simulated ground plane of the PCB through multiple spring contacts. As an example, the metal shielding cover is a copper shielding cover with a thickness of 0.5mm.

[0075] The heat-conducting component contacts either the metal shield or the metal heat-dissipating component, with the metal shield contacting the metal heat-dissipating component via a thermally conductive pad, thereby achieving effective heat dissipation. For example, the thickness of the thermally conductive pad can be approximately 1 mm.

[0076] In one exemplary embodiment, reference is made to Figure 3 or Figure 4 The internal circuit of the intelligent circuit breaker is divided into at least two of the following layers: a power layer 210, a sensing and drive layer 220, a control and signal processing layer 240, and a digital layer 230. The internal space of the intelligent circuit breaker is divided into at least two of the following regions: a first region, a second region, a third region, and a fourth region, arranged in the same direction.

[0077] The power layer 210 (high-voltage layer) is located in the first region. The power layer 210 includes at least a fuse unit, main contacts, and a primary conductor (copper busbar). As the mechanical foundation and bottom layer of the entire circuit breaker, the power layer 210 integrates inseparable high-voltage components such as the main contacts 310, protective cover 308, fuse 309, upper interface 306, lower interface 307, tripping mechanisms (separation tripping 313, overcurrent tripping 314, overload tripping 315, undervoltage tripping 316, and trip unit 317), fuse indicator lights 311, and shunt control interface 312. It provides standardized mounting holes and mechanical interfaces. All upper-layer functional modules are designed based on this base, ensuring that upper-layer modules of different models and functions of circuit breakers can be installed on the same series of bases. The power layer is electrically isolated from the upper-layer low-voltage circuits through physical space and insulating partitions.

[0078] The sensing and driving layer 220 is located in the second region and includes at least a current transformer 303, a MOS driving circuit 304, and a power isolation circuit 305. The sensing and driving layer 220 has an independent PCB and is fixedly connected to the secondary side terminals of the base via heavy-duty connectors or soldering to acquire current signals and provide drive power. The sensing and driving layer is controlled by the upper control layer via optocouplers or magnetic couplers.

[0079] The control and signal processing layer 240 is located in the third or fourth region. The control and signal processing layer 240 includes at least a main control module 110, an adhesion detection module 120, an insulation detection module 130, an adhesion detection interface, and an insulation detection interface. The adhesion detection module 120 and the insulation detection module 130 are respectively covered by corresponding metal shields 121 and 131. The control and signal processing layer 240 can be connected to the lower sensing layer and the upper communication layer via board-to-board connectors. 111 is thermal grease; 317 is a thermal pad; 318 is a heat sink fin.

[0080] Digital layer 230 (i.e., communication and interface) is located in the fourth or third region. Digital layer 230 includes at least a communication interface module 160, an optocoupler isolation 301, and a common-mode choke 302. The communication interface module 160 can be isolated from the main control module 110 via a high-speed optocoupler.

[0081] The digital layer is an independent communication board that can support different communication methods such as CAN and 4G to achieve data interaction with the outside world as needed.

[0082] An insulating partition is provided between the first and second regions; a target physical distance is configured between the second and third regions, such as a creepage distance greater than 8 mm.

[0083] It is understood that the division of the internal circuit hierarchy of the smart circuit breaker and the division of the internal space of the smart circuit breaker into regions are merely examples and are not intended to limit the invention. In actual applications, the division and layout can be carried out as needed.

[0084] The intelligent circuit breaker provided in this application adopts a layered electrical layout to optimize signal integrity and anti-interference capability. Using the power layer as a base, the sensing and drive layer, control and signal processing layer, and digital layer are flexibly stacked from bottom to top on the base via connectors (the position of each layer can be changed as needed during use), or they can be assembled and stacked and fixed at the factory by soldering according to requirements.

[0085] In this embodiment, the interference shielding design of the intelligent circuit breaker employs a multi-layer board with a complete grounding plane. Analog signal lines (especially insulation detection signals) use differential routing and are surrounded by ground wires. Separate metal shielding covers are designed and installed for the adhesion detection signal conditioning circuit and the insulation detection front-end amplification circuit, and these shielding covers are electrically connected to the system reference ground. All internal wires connecting to external detection terminals use shielded twisted-pair cables, and the shielding layer is grounded at a single point on the PCB.

[0086] In some exemplary embodiments, this application also provides a regenerative energy recovery system, which includes an intelligent circuit breaker as described in any of the above embodiments; the intelligent circuit breaker is disposed on the DC bus side of the regenerative energy recovery system.

[0087] As an example, a renewable energy recovery system could be an elevator, a lift, a nodding donkey, etc.

[0088] In this embodiment, the circuit breaker is installed on the DC bus side of the regenerative energy recovery system. It can monitor the status of the charging and discharging relays and the system insulation level in real time. All diagnostic data is uploaded to the regenerative energy recovery main controller via an isolated CAN bus (500kbps baud rate). The regenerative energy recovery system may include a battery (BAT), a motor, a frequency converter, and a system main controller.

[0089] The regenerative energy recovery system and intelligent circuit breaker provided in this application belong to the same inventive concept, can solve the same technical problems, and thus achieve the same technical effects. Repeated content will not be repeated here.

[0090] The beneficial effects of this application's embodiments include: deeply integrating two key safety diagnostic functions—external relay adhesion detection and system insulation monitoring (50MΩ threshold)—into a single intelligent circuit breaker, achieving comprehensive safety monitoring of the regenerative energy recovery system from "components" to "system," preventing problems before they occur. Through a unique electrical hierarchy design, zoned shielding measures (independent shielding covers, shielding wires), and advanced digital signal processing algorithms (such as digital phase-locked loop amplification), accurate measurement of weak detection signals is ensured even in strong electromagnetic interference environments inside the circuit breaker, resulting in high reliability. The chip-shielding cover-shell thermal conductive structure effectively solves the heat dissipation problem caused by high-density integration, ensuring the stability and lifespan of electronic components during long-term operation. It eliminates the need for external dedicated adhesion detection and insulation monitoring instruments, simplifying system wiring and reducing overall installation and maintenance costs. It provides fast-blow fuse protection, ensuring effective interruption of fault current under any extreme conditions, preventing equipment burnout or fire.

[0091] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this application. The above embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An intelligent circuit breaker, characterized in that, Includes adhesion detection module and / or insulation detection module; The adhesion detection module is connected to the contacts of an external control appliance and is used to provide an adhesion test signal to the adhesion detection circuit connected to the contacts according to the adhesion detection control signal output by the main control module. The insulation detection module is connected to an external insulation circuit and is used to provide an insulation test signal to the insulation detection circuit connected to the external insulation circuit according to the insulation detection control signal output by the main control module. Furthermore, the intelligent circuit breaker also includes: The main control module is used to acquire adhesion sampling signals from the adhesion detection circuit and determine the adhesion diagnosis result of the contact based on the adhesion sampling signals, and / or to acquire insulation sampling signals from the insulation detection circuit and determine the insulation diagnosis result of the external insulation circuit based on the insulation sampling signals; The fast-blow protection module is connected to the DC main circuit of the intelligent circuit breaker; the main control module is also used to monitor the status of the fuse unit in the fast-blow protection module and output an alarm signal when the fuse unit is detected to have blown.

2. The intelligent circuit breaker according to claim 1, characterized in that, The adhesion detection module includes at least a constant current source unit, and the adhesion test signal includes a constant current pulse signal. The constant current source unit is used to provide the constant current pulse signal to the adhesion detection circuit according to the adhesion detection control signal; The adhesion sampling signal includes the loop voltage value of the adhesion detection circuit; The main control module is used to determine the adhesion diagnosis result of the contact point based on the preset voltage threshold and the circuit voltage value.

3. The intelligent circuit breaker according to claim 1, characterized in that, The insulation detection module includes at least a direct digital frequency synthesizer unit, and the insulation test signal includes a waveform excitation signal. The direct digital frequency synthesizer unit is used to provide the waveform excitation signal to the insulation detection circuit according to the insulation detection control signal; The insulation sampling signal includes the insulation resistance value of the external insulation circuit; The main control module is used to determine the insulation diagnosis result of the external insulation circuit based on the preset resistance threshold and the insulation resistance value.

4. The intelligent circuit breaker according to claim 1, characterized in that, The fast-fuse protection module includes: The fuse unit is connected in series in the DC main circuit of the intelligent circuit breaker; A current limiting unit, wherein the first end of the current limiting unit is connected to the first end of the fuse unit; An optocoupler unit, wherein a first end of the optocoupler unit is connected to a second end of the current limiting unit, a second end of the optocoupler unit is connected to a second end of the fuse unit, and a third end of the optocoupler unit is connected to the main control module; The main control module is used to determine whether the fuse unit is blown or normal based on the output signal of the optocoupler unit.

5. The intelligent circuit breaker according to claim 1, characterized in that, The intelligent circuit breaker also includes: A communication interface module, connected to the main control module, is used to transmit the adhesion diagnosis results, insulation diagnosis results, and alarm signals output by the main control module to an external controller; The power management module is used to provide power to the adhesion detection module, the insulation detection module, the fast-blow fuse protection module, the main control module, and the communication interface module, respectively.

6. The intelligent circuit breaker according to claim 1, characterized in that, The intelligent circuit breaker also includes metal heat dissipation components; The adhesion detection module and the insulation detection module are respectively located inside the corresponding metal shielding cover; The main control module and the power management module in the intelligent circuit breaker are each equipped with heat-conducting components. Wherein, the heat-conducting component is in contact with the metal shielding cover, or the heat-conducting component is in contact with the metal heat dissipation component; The metal shielding cover contacts the metal heat dissipation component through thermally conductive pads.

7. The intelligent circuit breaker according to claim 1, characterized in that, The adhesion detection module includes multiple adhesion detection interfaces, and the contact is connected to the adhesion detection circuit through the adhesion detection interfaces; The insulation detection module includes multiple sets of insulation detection interfaces, and the external insulation circuit is connected to the insulation detection circuit through the insulation detection interfaces.

8. The intelligent circuit breaker according to claim 1, characterized in that, The internal circuit of the intelligent circuit breaker is divided into at least two of the following layers: power layer, sensing and driving layer, control and signal processing layer, and digital layer. The internal space of the intelligent circuit breaker is divided into at least two of the first, second, third, and fourth regions arranged in the same direction; The power layer is located in the first region and includes at least the fuse unit, main contact, and primary conductor; The sensing and driving layer is located in the second region and includes at least a current transformer and a power isolation circuit. The control and signal processing layer is located in the third region and includes at least the main control module, the adhesion detection module, the insulation detection module, the adhesion detection interface, and the insulation detection interface. The digital layer is located in the fourth region and includes at least a communication interface module.

9. A renewable energy recovery system, characterized in that, The regenerative energy recovery system includes a smart circuit breaker as described in any one of claims 1-8; the smart circuit breaker is located on the DC bus side of the regenerative energy recovery system.

10. The regenerative energy recovery system according to claim 9, characterized in that, The regenerative energy recovery system is an elevator, lift, or nodding donkey.

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