Miniature circuit breaker with load detection and temperature detection

Abstract

The invention discloses a miniature circuit breaker with load detection and temperature detection, and relates to the technical field of low-voltage electrical appliances, a circuit breaker body comprises a current detection module, one end of a microprocessor control unit is in electrical output connection with a communication module, and the other end of the microprocessor control unit is in electrical output connection with an alarm unit; the alarm unit is in electrical output connection with the display unit; the functions of load monitoring, temperature monitoring, traditional protection, intelligent early warning and remote communication are integrated, and the technical additional value of the miniature circuit breaker is greatly improved; active safety: through temperature monitoring and correlation analysis with current, hidden faults such as poor contact and the like which cannot be found by a traditional circuit breaker can be effectively identified and warned, and the prevention capability of electrical fire disasters is greatly improved. And intelligent management: data remote transmission is realized through a communication module, detailed power utilization data and historical records are provided for users, remote opening and closing operation is supported, and intelligent power utilization management and fault diagnosis are convenient to realize.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical technology, specifically to a miniature circuit breaker with integrated load and temperature detection. Background Technology

[0002] Miniature circuit breakers (MCBs) are the most widely used protective electrical devices in building electrical distribution systems, primarily used for overload and short-circuit protection. Traditional thermal-magnetic circuit breakers achieve their basic functions through bimetallic strips (overload protection) and electromagnetic trip units (short-circuit protection), but they have significant drawbacks: Limited functionality: It can only provide protection when the line current is abnormal, and cannot monitor and record the line's operating status (such as real-time current magnitude), let alone realize the remote transmission of power consumption data.

[0003] Unable to provide preventative alarms: Traditional circuit breakers do not provide any warning before tripping, which can cause inconvenience to users and make it impossible to detect potential electrical hazards in advance.

[0004] Unable to detect connection point faults: Many faults in power distribution systems (such as electrical fires) are not caused by line overload, but by excessive contact resistance and localized overheating due to loose or oxidized terminals. Traditional circuit breakers cannot detect this dangerous situation of "normal current but abnormal temperature," thus limiting their ability to prevent electrical fires.

[0005] With the development of the Internet of Things and smart grids, the market demand for intelligent circuit breakers with status monitoring, remote data transmission, and early warning functions is becoming increasingly urgent. Therefore, developing a miniature circuit breaker that integrates both load and temperature detection functions is of significant practical importance. To this end, we have improved the aforementioned existing technology based on actual usage. Summary of the Invention

[0006] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this section, the abstract and title of the invention. Such simplifications or omissions shall not be used to limit the scope of the present invention.

[0007] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A miniature circuit breaker with built-in load detection and temperature detection, comprising a circuit breaker body; The circuit breaker body includes a current detection module, the current detection module's electrical output is connected to a temperature detection module, the temperature detection module's electrical output is connected to a microprocessor control unit, one end of the microprocessor control unit's electrical output is connected to a communication module, the other end of the microprocessor control unit's electrical output is connected to an alarm unit, and the alarm unit's electrical output is connected to a display unit.

[0009] Furthermore: the communication module is a wireless communication module, which adopts one of the following communication protocols: Wi-Fi, Bluetooth, ZigBee, NB-IoT, or LoRa.

[0010] Furthermore, the temperature detection module is one of the following: a surface-mount thermistor, a thermocouple, or an infrared temperature sensor.

[0011] Furthermore: the current detection module is a Rogowski coil or a current sensor based on the magnetoresistive effect.

[0012] Furthermore: the display unit is located on the panel of the circuit breaker body.

[0013] Compared with the prior art, the beneficial effects of the present invention are: The miniature circuit breaker proposed in this paper integrates load and temperature detection, and is multifunctional: it integrates load monitoring, temperature monitoring, traditional protection, intelligent early warning and remote communication functions into one, which greatly enhances the technical added value of the miniature circuit breaker. Active safety: Through temperature monitoring and correlation analysis with current, it can effectively identify and warn of hidden faults such as poor contact that traditional circuit breakers cannot detect, greatly improving the ability to prevent electrical fires.

[0014] Intelligent management: Data is transmitted remotely through the communication module, providing users with detailed electricity consumption data and historical records, supporting remote opening and closing operations, and facilitating intelligent electricity management and fault diagnosis.

[0015] Compact structure: Each module adopts a highly integrated design, which can realize all functions without significantly increasing the size of the circuit breaker, and is easy to install and replace existing products.

[0016] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0017] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram illustrating the principle of the present invention.

[0020] In the diagram: 1. Circuit breaker body; 2. Current detection module; 3. Temperature detection module; 4. Microprocessor control unit; 5. Communication module; 6. Alarm unit; 7. Display unit. Detailed Implementation

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0023] Secondly, the present invention will be described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure will be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0024] Furthermore, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments. Example

[0025] Please see Figure 1 The present invention provides a technical solution: a miniature circuit breaker with built-in load detection and temperature detection, including a circuit breaker body 1; The circuit breaker body 1 includes a current detection module 2, which is located at the input or output end of the circuit breaker body 1. It is used to detect the current signal of the line in real time and accurately measure the current value (load) in the line. The current detection module 2 is electrically connected to a temperature detection module 3, which is located near the terminals or contacts of the circuit breaker body 1. It is used to detect the temperature signal at that location in real time and directly measure the temperature of these heat-prone points. The temperature detection module 3 is electrically connected to a microprocessor control unit 4, which is the core processing unit. It receives signals from the current and temperature sensors, performs A / D conversion, digital filtering, and calculation analysis. The MCU has multiple protection algorithms and logic pre-stored. Traditional protection functions include: accurate electronic overload inverse time protection and instantaneous short circuit protection. Temperature protection function: When the temperature at the detection point exceeds the set safety threshold, an alarm can be issued or the tripping mechanism can be directly controlled to operate. Intelligent early warning function (core innovation): The MCU can comprehensively analyze current and temperature information. For example, when the line current is not detected to exceed the rated value, but the temperature of the terminal block continues to rise rapidly or exceeds the warning value, the MCU can determine that there is a potential "poor contact" and send an early warning message to the user in advance through the communication module 5 to achieve preventive maintenance and effectively avoid fire. The microprocessor control unit 4 is configured to: control the operating mechanism to perform opening or closing actions based on the processed current signal and temperature signal; calculate the effective value of the current and compare it with the preset overload current threshold and short circuit current threshold to perform overload delay protection and instantaneous short circuit protection; and compare the temperature signal with the preset temperature alarm threshold and temperature tripping threshold. The system performs a comparison; it executes an early warning logic based on the correlation analysis of current and temperature. Specifically, when the detected current value is within the safe range, but the temperature value continues to rise abnormally or exceeds the early warning threshold, it determines that there is a risk of poor contact and triggers an early warning or protection action. One end of the microprocessor control unit 4 is electrically connected to the communication module 5. The communication module 5 is connected to the microprocessor control unit 4 and is used to send at least one of the current signal, temperature signal, and circuit breaker opening and closing status information to an external device or cloud platform to achieve remote monitoring and management. The other end of the microprocessor control unit 4 is electrically connected to the alarm unit 6. The alarm unit 6 is connected to the microprocessor control unit 4. The microprocessor control unit 4 is configured to control the alarm unit 6 to issue an audible, visual, and / or vibration alarm when the current signal exceeds a preset current threshold and / or the temperature signal exceeds a preset temperature threshold. The alarm unit 6 is electrically connected to the display unit 7.

[0026] Preferably, the communication module 5 is a wireless communication module, which adopts one of the communication protocols of Wi-Fi, Bluetooth, ZigBee, NB-IoT or LoRa.

[0027] Preferably, the temperature detection module 3 is one of a surface-mount thermistor, thermocouple, or infrared temperature sensor.

[0028] Preferably, the current detection module 2 is a Rogowski coil or a current sensor based on the magnetoresistive effect.

[0029] Preferably, the display unit 7 is located on the panel of the circuit breaker body 1, so that it can be used to display the current value, temperature value and / or alarm information in real time. Example

[0030] The current detection module 2 uses a Rogowski coil, which is wrapped around the main circuit wire and outputs a voltage signal proportional to the current to the MCU 4. The temperature detection module 3 uses an NTC thermistor, which is tightly attached to the metal conductor of the power input terminal with thermally conductive adhesive. Its resistance value changes with temperature and is converted into a digital temperature value by the internal circuit of the MCU 4.

[0031] MCU 4 uses a low-power ARM Cortex-M series chip, and its internal program has preset multiple protection thresholds: Current threshold: overload protection value (e.g., 1.13-1.45 times In), short circuit protection value (e.g., 5-10 times In).

[0032] Temperature thresholds: temperature warning value (e.g., 60℃), temperature trip value (e.g., 80℃).

[0033] Operating Logic: After the system powers on, MCU 4 continuously collects current and temperature data. First, it checks for short circuits. If the current exceeds the short circuit threshold, it immediately issues a trip command. Otherwise, it checks for overloads. If the current exceeds the overload threshold, it starts an inverse time delay count. Tripping occurs after the delay. Simultaneously, it checks the temperature. If the temperature exceeds the trip threshold, it trips immediately. If the temperature only exceeds the warning threshold but not the trip threshold, it performs an intelligent judgment based on the current situation: If the current is normal, it indicates the problem is not caused by overload, but is likely due to poor contact. MCU 4 will send a "Contact resistance abnormal, please check" warning message to the host computer via communication module 5 and illuminate the local alarm light. If the current also exceeds the limit, it is handled according to the overload procedure. The communication module 5 uses a Wi-Fi module, which can push all data to the cloud platform. The display unit 7 is a miniature OLED screen used to cyclically display real-time current and temperature.

[0034] It should be noted that the electrical components of this invention have already combed the wire harness during operation, so there will be no problem of wire harness tangling.

[0035] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine task in design, manufacturing, and production without requiring extensive experimentation.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A miniature circuit breaker with integrated load detection and temperature detection, characterized in that: Including the circuit breaker body (1); The circuit breaker body (1) includes a current detection module (2), the current detection module (2) is electrically connected to a temperature detection module (3), the temperature detection module (3) is electrically connected to a microprocessor control unit (4), one end of the microprocessor control unit (4) is electrically connected to a communication module (5), the other end of the microprocessor control unit (4) is electrically connected to an alarm unit (6), and the alarm unit (6) is electrically connected to a display unit (7).

2. The miniature circuit breaker with integrated load detection and temperature detection according to claim 1, characterized in that: The communication module (5) is a wireless communication module, which adopts one of the following communication protocols: Wi-Fi, Bluetooth, ZigBee, NB-IoT or LoRa.

3. A miniature circuit breaker with integrated load detection and temperature detection according to claim 1, characterized in that: The temperature detection module (3) is one of a surface-mount thermistor, thermocouple, or infrared temperature sensor.

4. A miniature circuit breaker with integrated load detection and temperature detection according to claim 1, characterized in that: The current detection module (2) is a Rogowski coil or a current sensor with magnetoresistive effect.

5. A miniature circuit breaker with integrated load detection and temperature detection according to claim 1, characterized in that: The display unit (7) is disposed on the panel of the circuit breaker body (1).

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