Internet-of-things electric leakage circuit breaker with electric leakage disable function and method

Abstract

The invention discloses an Internet of Things electric leakage circuit breaker with an electric leakage disable function and a method, and relates to the field of power equipment. The invention discloses an Internet of Things electric leakage circuit breaker with an electric leakage disability function. The Internet of Things electric leakage circuit breaker comprises a control module, an electric leakage acquisition module, an electric leakage disability module and a tripping module, according to the invention, remote accurate control of the electric leakage function is realized by controlling the multi-path change-over switch through the processor, the intelligent level and the practicability of the electric leakage circuit breaker of the Internet of Things are improved, and the development requirements of a novel power system are better met.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment, and in particular to an Internet of Things leakage circuit breaker with a leakage disabling function and a method thereof. Background Art

[0002] IoT circuit breakers play a vital role in power systems. They are generally categorized as either externally powered or internally powered. While externally powered circuit breakers offer advantages like cost savings and the ability to add power protection hardware, they also present challenges in preventing leakage.

[0003] The IoT circuit breaker has a metering part that needs to be calibrated. During the calibration process, it is necessary to apply a voltage between LN and a current to the L line to calibrate the amplitude and phase. Since the leakage part is powered by the upper end of the circuit breaker, the circuit breaker will trigger the leakage trip, making calibration impossible; at the same time, some users need to shield the leakage function and disable the leakage function. Therefore, the leakage function needs a user-controllable enable and disable switch. The existing technology is achieved by manually mechanically switching the size of the input circuit resistance, which is extremely inconvenient to operate. In addition, the manual mechanical switching method cannot be integrated with modern IoT technology to achieve intelligent leakage function management.

[0004] Therefore, the method of controlling the multi-way switching switch by a processor proposed in the present invention can effectively overcome the above problems, realize remote and precise control of the leakage function, improve the intelligence level and practicality of the Internet of Things leakage circuit breaker, and better adapt to the development needs of modern power systems. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the manual mechanical switching mode is extremely inconvenient to operate. The present invention discloses an Internet of Things leakage circuit breaker with a leakage disabling function and a method to achieve remote and precise control of the leakage function, thereby improving the intelligence level and practicality of the Internet of Things leakage circuit breaker.

[0006] To achieve the above object, the present invention provides the following technical solutions: An Internet of Things leakage circuit breaker with a leakage disabling function, comprising: The control module controls the enabling and disabling of the circuit breaker leakage function through the CPU; The leakage current acquisition module collects the leakage current signal in the circuit through the zero-sequence mutual inductor; A leakage disabling module, comprising a single-pole double-throw switch U38 and a first power supply unit; the leakage disabling module is used to achieve leakage disabling; A trip module, comprising a leakage protection chip U28, a trip unit and a second power supply unit; the trip module is used to cut off the power supply; The output end of the control module is connected to the input end of the leakage disabling module, the output end of the leakage current acquisition module is connected to the input end of the leakage disabling module, and the output end of the leakage disabling module is connected to the input end of the tripping module.

[0007] Preferably, the leakage current acquisition module includes a zero-sequence transformer secondary side output CN5 and a differential amplifier U24.3; the two ends of the leakage current acquisition module are respectively connected to the B pin and the A1 pin of the single-pole double-throw switch U38; the zero-sequence transformer secondary side output CN5 is used to monitor the magnitude of the leakage current and transmit it to the leakage current acquisition module; the differential amplifier U24.3 is used to amplify the collected leakage current information; the 2nd pin of the zero-sequence transformer secondary side output CN5 is connected to the 10th pin of the differential amplifier U24.3, and the 11th pin of the zero-sequence transformer secondary side output CN5 is connected to the 9th pin of the differential amplifier U24.3.

[0008] Preferably, the first power supply unit includes a lithium battery U39 and an external power supply device; the external power supply device is used to convert the voltage 12V into 3.3V; the lithium battery U39 is used to ensure that the leakage function works when there is no 12V power supply from the external power supply device.

[0009] Preferably, the IN1 pin and IN2 pin of the leakage protection chip U28 in the trip module are signal input terminals, and the OS pin is a signal output terminal; when the leakage protection chip U28 reaches the voltage threshold, the OS pin outputs a high level to the trip unit Q5, and turns on the trip unit Q5 to achieve tripping; when the leakage protection chip U28 does not reach the voltage threshold, the tripping fails; the OS pin of the leakage protection chip U28 is connected to the trip unit Q5, and the output terminal of the second power supply unit is connected to the VS pin of the leakage protection chip U28.

[0010] Preferably, in the leakage disabling module, the B pin and A1 pin of the single-pole double-throw switch U38 are respectively connected to the IN1 pin and IN2 pin of the leakage protection chip U28, and the output end of the first power supply unit is connected to the VCC pin of the single-pole double-throw switch U38; when the ENB pin is at a low level, the B pin is connected to the A2 pin; when the ENB pin is at a high level, the B pin is connected to the A1 pin.

[0011] Preferably, the second power supply unit includes a power supply component, a rectifier component and an anti-reverse component; the power supply component includes H12, H4, H5 and H7, which are used to provide power; the rectifier component includes Schottky diodes D9, D11 and D13; and the anti-reverse component includes D10.

[0012] Preferably, the control module has a built-in communication unit to realize remote control; the output end of the control module is connected to the ENB pin of the single-pole double-throw switch U38 in the leakage disabling module.

[0013] A control method for an Internet of Things leakage circuit breaker with a leakage disabling function, comprising the following steps: S1, the zero-sequence transformer secondary side output CN5 in the leakage current acquisition module monitors the leakage current in the circuit in real time, and transmits the collected leakage current signal to the differential amplifier U24.3 for amplification processing, and transmits the amplified signal to the control module, which monitors the leakage current size and leakage status in real time; S2, the control module outputs a level signal to the ENB pin of the single-pole double-throw switch U38 in the leakage disabling module according to the user instruction; S3. When the control module inputs a low level to the ENB pin, the B pin of the single-pole double-throw switch U38 is connected to the A2 pin, the leakage disabling module is in a normal state, and the tripping module can work normally; S4. When the external 12V power supply is normal and the leakage function needs to be disabled, the control module outputs a high level to the ENB pin, connecting the B pin of the single-pole double-throw switch U38 to the A1 pin, short-circuiting the zero-sequence transformer secondary side output CN5 and the resistor R127, preventing the leakage current signal from being normally transmitted to the leakage protection chip U28, thereby preventing the leakage protection chip U28 from reaching the voltage threshold and disabling the leakage function. Beneficial effects

[0014] An Internet of Things leakage circuit breaker and method with a leakage disabling function can conveniently achieve remote enabling and disabling of the leakage function by controlling a multi-way switching switch through a processor, avoiding the trouble of traditional manual mechanical switching methods and improving operational convenience and efficiency. In addition, the lithium battery in the first power supply unit ensures that the leakage function can still work when the external power supply is lost, and the second power supply unit provides a stable power supply for the trip module, thereby improving the reliability and stability of the entire circuit breaker and ensuring that the circuit can play an effective leakage protection role under various working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an overall circuit diagram of an Internet of Things leakage circuit breaker and method with leakage disabling function according to the present invention; Figure 2 This is a circuit diagram of a leakage disabling module of an Internet of Things leakage circuit breaker and method with a leakage disabling function according to the present invention; Figure 3 This is a circuit diagram of a trip module of an Internet of Things leakage circuit breaker and method with a leakage disabling function according to the present invention; Figure 4 This is a circuit diagram of a leakage collection module of an Internet of Things leakage circuit breaker and method with a leakage disabling function according to the present invention. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention; in addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0018] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0019] An Internet of Things leakage circuit breaker and method with a leakage disabling function, comprising: The control module controls the enabling and disabling of the circuit breaker leakage function through the CPU; The leakage current acquisition module collects the leakage current signal in the circuit through the zero-sequence mutual inductor; A leakage disabling module, comprising a single-pole double-throw switch U38 and a first power supply unit; the leakage disabling module is used to achieve leakage disabling; A trip module, comprising a leakage protection chip U28, a trip unit and a second power supply unit; the trip module is used to cut off the power supply; The output end of the control module is connected to the input end of the leakage disabling module, the output end of the leakage current acquisition module is connected to the input end of the leakage disabling module, and the output end of the leakage disabling module is connected to the input end of the tripping module.

[0020] In the present invention, the leakage current acquisition module includes a zero-sequence transformer secondary side output CN5 and a differential amplifier U24.3; the two ends of the leakage current acquisition module are respectively connected to the B pin and the A1 pin of the single-pole double-throw switch U38; the zero-sequence transformer secondary side output CN5 is used to monitor the magnitude of the leakage current and transmit it to the leakage current acquisition module and the leakage disabling module; the differential amplifier U24.3 is used to amplify the collected leakage current information; the 2 pin of the zero-sequence transformer secondary side output CN5 is connected to the 10 pin of the differential amplifier U24.3, and the 11 pin of the zero-sequence transformer secondary side output CN5 is connected to the 9 pin of the differential amplifier U24.3.

[0021] In the present invention, the first power supply unit includes a lithium battery U39 and an external power supply device; the external power supply device is used to convert the voltage 12V into 3.3V; the lithium battery U39 is used to ensure that the leakage function works when there is no 12V power supply from the external power supply device.

[0022] In a specific embodiment, the leakage protection chip U28 adopts a model SS54123G3; the single-pole double-throw switch U38 adopts a model BL1551B.

[0023] In a specific embodiment, when the external 12V power supply is abnormal, the lithium battery U39 in the first power supply unit starts working to provide power support for the leakage disabling module, ensuring that the leakage function is still in a triggerable state, that is, the zero-sequence transformer secondary side output CN5 can normally monitor the leakage current situation. Once leakage occurs and reaches the threshold, the trip module can still perform the tripping operation to ensure circuit safety.

[0024] R156 is a current limiting resistor and R127 is used to adjust the threshold voltage.

[0025] In the present invention, the IN1 pin and IN2 pin of the leakage protection chip U28 in the trip module are signal input terminals, and the OS pin is a signal output terminal; when the leakage protection chip U28 reaches the voltage threshold, the OS pin outputs a high level to the trip unit Q5, and turns on the trip unit Q5 to achieve tripping; when the leakage protection chip U28 does not reach the voltage threshold, the tripping fails; the OS pin of the leakage protection chip U28 is connected to the trip unit Q5, and the output terminal of the second power supply unit is connected to the VS pin of the leakage protection chip U28.

[0026] In the present invention, in the leakage disabling module, the B pin and A1 pin of the single-pole double-throw switch U38 are respectively connected to the IN1 pin and IN2 pin of the leakage protection chip U28, and the output end of the first power supply unit is connected to the VCC pin of the single-pole double-throw switch U38; when the ENB pin is at a low level, the B pin is connected to the A2 pin; when the ENB pin is at a high level, the B pin is connected to the A1 pin.

[0027] In the present invention, the second power supply unit includes a power supply component, a rectifier component and an anti-reverse component; the power supply component includes H12, H4, H5 and H7, which are used to provide power; the rectifier component includes Schottky diodes D9, D11 and D13; and the anti-reverse component includes D10.

[0028] In a specific embodiment, the power supply component, rectifier component and anti-reverse component in the second power supply unit work together to provide a stable power supply for the leakage protection chip U28 in the trip module. D24 and C30 are placed next to the power pin of the leakage protection chip U28 to stabilize the voltage and prevent surge current from destroying U28.

[0029] In the present invention, the control module has a built-in communication unit to realize remote control; the output end of the control module is connected to the ENB pin of the single-pole double-throw switch U38 in the leakage disabling module.

[0030] In a specific embodiment, the communication unit is compatible with Zigbee, LoRa, NB-IoT or 4G / 5G cellular network communication.

[0031] A control method for an Internet of Things leakage circuit breaker with a leakage disable function, comprising the following steps: S1, the zero-sequence transformer secondary side output CN5 in the leakage current acquisition module monitors the leakage current in the circuit in real time, and transmits the collected leakage current signal to the differential amplifier U24.3 for amplification processing, and transmits the amplified signal to the control module, which monitors the leakage current size and leakage status in real time; S2, the control module outputs a level signal to the ENB pin of the single-pole double-throw switch U38 in the leakage disabling module according to the user instruction; S3. When the control module inputs a low level to the ENB pin, the B pin of the single-pole double-throw switch U38 is connected to the A2 pin, the leakage disabling module is in a normal state, and the tripping module can work normally; S4. When the external 12V power supply is normal and the leakage function needs to be disabled, the control module outputs a high level to the ENB pin, connecting the B pin of the single-pole double-throw switch U38 to the A1 pin, short-circuiting the zero-sequence transformer secondary side output CN5 and the resistor R127, preventing the leakage current signal from being normally transmitted to the leakage protection chip U28, thereby preventing the leakage protection chip U28 from reaching the voltage threshold and disabling the leakage function.

[0032] In a specific embodiment, the working steps of the measurement calibration mode, i.e., disabling the leakage function, are as follows: The operator sends a command to the control module through the remote control terminal to enter the measurement calibration mode, and at the same time ensures that the external 12V power supply is normal; After receiving the command, the control module outputs a high-level signal to the ENB pin of the single-pole double-throw switch U38, connecting the B pin of the single-pole double-throw switch U38 to the A1 pin, and short-circuiting the secondary side output CN5 of the zero-sequence transformer and the resistor R127; The leakage protection chip U28 cannot reach the voltage threshold and will not trigger the tripping action, thereby disabling the leakage function.

[0033] In a specific embodiment, the working steps of the normal leakage protection working mode are: The control module initializes the system and outputs a low-level signal to the ENB pin of the single-pole double-throw switch U38 in the leakage disabling module, and the B pin of the single-pole double-throw switch U38 is connected to the A2 pin; Leakage current collection and monitoring: When there is no leakage in the circuit, the voltage across the zero-sequence transformer secondary output CN5 is essentially zero; the differential amplifier U24.3 continuously receives the signal from the zero-sequence transformer secondary output CN5. Since the leakage current is extremely small, the signal amplified by the differential amplifier U24.3 is not sufficient to trigger any action of the control module. The entire system is in normal operation and the circuit remains conductive. Leakage protection: The sum of the current vectors on the primary side of the zero-sequence transformer is no longer zero, and a corresponding voltage signal is sensed at both ends of the secondary output CN5. The voltage signal is amplified by the differential amplifier U24.3 and transmitted to the control module. It is also transmitted to the IN1 and IN2 pins of the leakage protection chip U28 of the trip module. After receiving the amplified leakage current signal, the leakage protection chip U28 analyzes and judges it. When the signal voltage reaches the threshold voltage set by the leakage protection chip U28, the OS pin outputs a high-level signal to the trip unit Q5; After receiving the high-level signal, the trip unit Q5 is turned on, driving the trip mechanism to operate, thereby cutting off the circuit and achieving leakage protection for the circuit.

[0034] The above is a detailed introduction to the disclosed method of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An Internet of Things leakage circuit breaker with leakage disabling function, characterized in that: include: The control module controls the enabling and disabling of the circuit breaker leakage function through the CPU; The leakage current acquisition module acquires the leakage current signal in the circuit through the zero-sequence mutual inductor; A leakage disabling module, comprising a single-pole double-throw switch U38 and a first power supply unit; the leakage disabling module is used to achieve leakage disabling; A tripping module, comprising a leakage protection chip U28, a tripping unit and a second power supply unit; the tripping module is used to cut off the power supply; The output end of the control module is connected to the input end of the leakage disabling module, the output end of the leakage current acquisition module is connected to the input end of the leakage disabling module, and the output end of the leakage disabling module is connected to the input end of the tripping module.

2. The Internet of Things leakage circuit breaker with leakage disabling function as claimed in claim 1, characterized in that: The leakage current acquisition module includes a zero-sequence transformer secondary side output CN5 and a differential amplifier U24.3; the two ends of the leakage current acquisition module are respectively connected to the B pin and the A1 pin of the single-pole double-throw switch U38; the zero-sequence transformer secondary side output CN5 is used to monitor the magnitude of the leakage current and transmit it to the leakage current acquisition module; the differential amplifier U24.3 is used to amplify the collected leakage current information; the pin 2 of the zero-sequence transformer secondary side output CN5 is connected to the pin 10 of the differential amplifier U24.3, and the pin 11 of the zero-sequence transformer secondary side output CN5 is connected to the pin 9 of the differential amplifier U24.

3.

3. The Internet of Things leakage circuit breaker with leakage disabling function as claimed in claim 1, characterized in that: The first power supply unit includes a lithium battery U39 and an external power supply device; the external power supply device is used to convert the voltage of 12V into 3.3V; the lithium battery U39 is used to ensure that the leakage function works when there is no 12V power supply from the external power supply device.

4. The Internet of Things leakage circuit breaker with leakage disabling function as claimed in claim 1, characterized in that: The IN1 pin and the IN2 pin of the leakage protection chip U28 in the trip module are signal input terminals, and the OS pin is a signal output terminal; when the leakage protection chip U28 reaches the voltage threshold, the OS pin outputs a high level to the trip unit Q5, and turns on the trip unit Q5 to achieve tripping; when the leakage protection chip U28 does not reach the voltage threshold, the tripping fails; the OS pin of the leakage protection chip U28 is connected to the trip unit Q5, and the output terminal of the second power supply unit is connected to the VS pin of the leakage protection chip U28.

5. The Internet of Things leakage circuit breaker with leakage disabling function as claimed in claim 1, characterized in that: In the leakage disabling module, the B pin and A1 pin of the single-pole double-throw switch U38 are respectively connected to the IN1 pin and IN2 pin of the leakage protection chip U28, and the output end of the first power supply unit is connected to the VCC pin of the single-pole double-throw switch U38; when the ENB pin is at a low level, the B pin is connected to the A2 pin; when the ENB pin is at a high level, the B pin is connected to the A1 pin.

6. The Internet of Things leakage circuit breaker with leakage disabling function as claimed in claim 1, characterized in that: The second power supply unit includes a power supply component, a rectifier component and an anti-reverse component; the power supply component includes H12, H4, H5 and H7, which are used to provide power; the rectifier component includes Schottky diodes D9, D11 and D13; the anti-reverse component includes D10.

7. The Internet of Things leakage circuit breaker with leakage disabling function as claimed in claim 1, characterized in that: The control module has a built-in communication unit to realize remote control; the output end of the control module is connected to the ENB pin of the single-pole double-throw switch U38 in the leakage disabling module.

8. A control method for an Internet of Things leakage circuit breaker with a leakage disabling function, used for an Internet of Things leakage circuit breaker with a leakage disabling function as claimed in claims 1-7, characterized in that: Here are the steps: S1, the zero-sequence transformer secondary side output CN5 in the leakage current collection module monitors the leakage current in the circuit in real time, and transmits the collected leakage current signal to the differential amplifier U24.3 for amplification, and transmits the amplified signal to the control module, and the control module monitors the leakage current size and leakage state in real time; S2, the control module outputs a level signal to the ENB pin of the single-pole double-throw switch U38 in the leakage disabling module according to the user instruction; S3, when the control module inputs a low level to the ENB pin, the B pin of the single-pole double-throw switch U38 is connected to the A2 pin, the leakage disabling module is in a normal state, and the tripping module can work normally; S4. When the external 12V power supply is normal and the leakage function needs to be disabled, the control module outputs a high level to the ENB pin, connects the B pin of the single-pole double-throw switch U38 to the A1 pin, and short-circuits the zero-sequence transformer secondary side output CN5 and the resistor R127, preventing the leakage current signal from being normally transmitted to the leakage protection chip U28, so that the leakage protection chip U28 cannot reach the voltage threshold, thereby disabling the leakage function.

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