An Internet of Things leakage circuit breaker and method with a leakage power loss function

Abstract

The present invention discloses an Internet of Things leakage circuit breaker with a leakage power loss function and a method, which relates to the field of power equipment; an Internet of Things leakage circuit breaker with a leakage power loss function includes a control module, a leakage acquisition module, a leakage power loss module and a tripping module; the present invention realizes the remote precise control of the leakage function by means of a processor controlling a multi-way switch, improves the intelligent level and practicality of the Internet of Things leakage circuit breaker, and better meets the development needs of the new power system.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment, and particularly relates to an Internet of Things leakage circuit breaker with a leakage de - energization function and a method therefor. Background Art

[0002] The Internet of Things circuit breaker plays an important role in the power system, and it is generally divided into externally - powered and internally - powered types. Although the externally - powered type has advantages such as cost savings and the ability to add power protection hardware, there are problems in the implementation of the leakage part.

[0003] The Internet of Things circuit breaker has a metering part that needs to be calibrated. During the calibration process, a voltage needs to be applied between L and N and a current needs to be applied on the L line for amplitude and phase calibration. Since the leakage part is powered from the upper end of the circuit breaker, the circuit breaker will trigger a leakage trip at this time, making the calibration impossible to carry out; at the same time, in some user usage scenarios, the leakage function needs to be shielded, that is, the leakage function needs to be disabled. Therefore, the leakage function needs a user - controllable enable - disable switch. The prior art realizes this through a manual mechanical switching method to adjust the size of the input circuit resistance, which is extremely inconvenient to operate, and the manual mechanical switching method cannot be integrated with modern Internet of Things technology to achieve intelligent leakage function management.

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

[0005] In view of the deficiencies of the prior art that the manual mechanical switching method is extremely inconvenient to operate, the present invention discloses an Internet of Things leakage circuit breaker with a leakage de - energization function and a method therefor, which realizes remote and precise control of the leakage function and improves the intelligent 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:

[0007] An Internet of Things leakage circuit breaker with a leakage de - energization function, comprising:

[0008] A control module that controls the enabling and disabling of the leakage function of the circuit breaker through a CPU;

[0009] A leakage current acquisition module that acquires leakage current signals in the circuit through a zero - sequence current transformer;

[0010] A leakage de - energization module, including a single - pole double - throw switch U38 and a first power supply unit; the leakage de - energization module is used to realize leakage de - energization;

[0011] The tripping module includes 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;

[0012] 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.

[0013] Preferably, the leakage current acquisition module includes the secondary side output CN5 of a zero-sequence current transformer and a differential amplifier U24.3; both 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 secondary side output CN5 of the zero-sequence current transformer 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 acquired leakage current information; the 2 pin of the secondary side output CN5 of the zero-sequence current transformer is connected to the 10th pin of the differential amplifier U24.3, and the 11th pin of the secondary side output CN5 of the zero-sequence current transformer is connected to the 9th pin of the differential amplifier U24.3.

[0014] 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 of 12V into 3.3V; the lithium battery U39 is used to ensure the normal operation of the leakage protection function when there is no 12V power supply from the external power supply device.

[0015] Preferably, in the tripping module, the IN1 pin and the IN2 pin of the leakage protection chip U28 are signal input ends, and the OS pin is a signal output end; when the leakage protection chip U28 reaches the voltage threshold, the OS pin outputs a high level to the tripping unit Q5 and turns on the tripping unit Q5 to achieve tripping; when the leakage protection chip U28 does not reach the voltage threshold, tripping fails; the OS pin of the leakage protection chip U28 is connected to the tripping unit Q5, and the output end of the second power supply unit is connected to the VS pin of the leakage protection chip U28.

[0016] Preferably, in the leakage disabling module, the B pin and the A1 pin of the single-pole double-throw switch U38 are respectively connected to the IN1 pin and the 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.

[0017] Preferably, the second power supply unit includes a power supply component, a rectification component, and an anti-reverse component; the power supply component includes H12, H4, H5, and H7 for providing power; the rectification component includes Schottky diodes D9, D11, and D13; the anti-reverse component includes D10.

[0018] Preferably, the control module has a built-in communication unit to achieve 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 power-off module.

[0019] A control method for an IoT leakage circuit breaker with a leakage power-off function is as follows:

[0020] S1. The zero-sequence current transformer on the secondary side of the leakage current acquisition module outputs CN5 to continuously monitor the leakage current in the circuit, and at the same time transmits the collected leakage current signal to the differential amplifier U24.3 for amplification processing, and transmits the amplified signal to the control module. The control module continuously monitors the magnitude and leakage state of the leakage current.

[0021] S2. The control module outputs a level signal to the ENB pin of the single-pole double-throw switch U38 in the leakage power-off module according to the user instruction.

[0022] 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 power-off module is in a normal state, and the tripping module can work normally.

[0023] 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, so that the B pin of the single-pole double-throw switch U38 is connected to the A1 pin, short-circuits the output CN5 of the secondary side of the zero-sequence current transformer and the resistor R127, and prevents 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, realizing the disabling of the leakage function. Beneficial effects

[0024] An IoT leakage circuit breaker and method with a leakage power-off function controls a multi-way switch through a processor, which can conveniently realize the remote enabling and disabling of the leakage function, avoiding the trouble of the traditional manual mechanical switching method, improving the operation convenience and efficiency; and the lithium battery in the first power supply unit ensures that the leakage function can still work when the external power supply is missing, and the second power supply unit provides a stable power supply for the tripping module, 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. Description of the drawings

[0025] Figure 1The overall circuit diagram of an IoT leakage circuit breaker and method with a leakage - disabling function according to the present invention;

[0026] Figure 2 The circuit diagram of the leakage - disabling module of an IoT leakage circuit breaker and method with a leakage - disabling function according to the present invention;

[0027] Figure 3 The circuit diagram of the tripping module of an IoT leakage circuit breaker and method with a leakage - disabling function according to the present invention;

[0028] Figure 4 The circuit diagram of the leakage - current acquisition module of an IoT leakage circuit breaker and method with a leakage - disabling function according to the present invention. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] An IoT leakage circuit breaker and method with a leakage - disabling function, comprising:

[0033] A control module that enables and disables the leakage function of the circuit breaker through a CPU;

[0034] A leakage - current acquisition module that acquires leakage - current signals in the circuit through a zero - sequence current transformer;

[0035] The leakage - disabling module includes a single - pole double - throw switch U38 and a first power - supply unit; the leakage - disabling module is used to achieve leakage - disabling.

[0036] The tripping module includes 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.

[0037] 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.

[0038] In the present invention, the leakage - current acquisition module includes the secondary - side output CN5 of a zero - sequence current transformer and a differential amplifier U24.3; both 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 secondary - side output CN5 of the zero - sequence current transformer 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 acquired leakage - current information; the 2 - pin of the secondary - side output CN5 of the zero - sequence current transformer is connected to the 10 - th pin of the differential amplifier U24.3, and the 11 - pin of the secondary - side output CN5 of the zero - sequence current transformer is connected to the 9 - th pin of the differential amplifier U24.3.

[0039] 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 of 12V into 3.3V; the lithium - battery U39 is used to ensure the normal operation of the leakage - disabling function when there is no 12V power supply from the external power - supply device.

[0040] In a specific embodiment, the model of the leakage - protection chip U28 is SS54123G3; the model of the single - pole double - throw switch U38 is BL1551B.

[0041] In a specific embodiment, when the external 12V power supply is abnormal, the lithium - battery U39 in the first power - supply unit starts to work, providing power support for the leakage - disabling module to ensure that the leakage - disabling function is still in a triggerable state, that is, the secondary - side output CN5 of the zero - sequence current transformer can normally monitor the leakage - current situation. Once a leakage occurs and reaches the threshold value, the tripping module can still perform the tripping operation to ensure the safety of the circuit.

[0042] R156 is a current - limiting resistor, and R127 is used to adjust the threshold voltage.

[0043] In the present invention, in the trip module, the IN1 and IN2 pins of the leakage protection chip U28 are signal input terminals, and the OS pin is the 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 the trip unit Q5 is turned on 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.

[0044] In the present invention, in the leakage disabling module, the B pin and the A1 pin of the single-pole double-throw switch U38 are respectively connected to the IN1 pin and the IN2 pin of the leakage protection chip U28, and the output terminal 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.

[0045] In the present invention, the second power supply unit includes a power supply component, a rectification component, and an anti-reverse component; the power supply component includes H12, H4, H5, and H7 for providing power; the rectification component includes Schottky diodes D9, D11, and D13; the anti-reverse component includes D10.

[0046] In a specific embodiment, the power supply component, the rectification component, and the 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 beside the power pins of the leakage protection chip U28 to play a role in stabilizing the voltage and preventing the surge current from damaging U28.

[0047] In the present invention, the control module is built-in with a communication unit to achieve remote control; the output terminal of the control module is connected to the ENB pin of the single-pole double-throw switch U38 in the leakage disabling module.

[0048] In a specific embodiment, the communication unit is compatible with Zigbee, LoRa, NB-IoT, or 4G / 5G cellular network communication.

[0049] A control method for an IoT leakage circuit breaker with a leakage disabling function is as follows:

[0050] S1. The zero-sequence current transformer on the secondary side of the leakage current acquisition module outputs CN5 to continuously monitor the leakage current in the circuit, and at the same time transmits the collected leakage current signal to the differential amplifier U24.3 for amplification processing, and transmits the amplified signal to the control module, and the control module continuously monitors the magnitude and leakage state of the leakage current.

[0051] 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;

[0052] 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 trip module can work normally;

[0053] S4. When the external 12V is normally powered and the leakage function needs to be disabled, the control module outputs a high level to the ENB pin, causing the B pin of the single-pole double-throw switch U38 to be connected to the A1 pin, short-circuiting the secondary side output CN5 of the zero-sequence current transformer 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, realizing the disabling of the leakage function.

[0054] In a specific embodiment, the metering calibration mode, that is, the working steps of the disabled leakage function are as follows:

[0055] The operator sends an instruction to the control module through the remote control terminal to enter the metering calibration mode, and at the same time ensures that the external 12V power supply is normal;

[0056] After receiving the instruction, the control module outputs a high level signal to the ENB pin of the single-pole double-throw switch U38, the B pin of the single-pole double-throw switch U38 is connected to the A1 pin, and the secondary side output CN5 of the zero-sequence current transformer is short-circuited with the resistor R127;

[0057] The leakage protection chip U28 cannot reach the voltage threshold and will not trigger a trip action, thus realizing the disabling of the leakage function.

[0058] In a specific embodiment, the working steps of the normal leakage protection working mode are as follows:

[0059] The control module initializes the system, the control module 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;

[0060] Leakage current acquisition and monitoring. When there is no leakage phenomenon in the circuit, the voltage across the secondary side output CN5 of the zero-sequence current transformer is basically zero; the differential amplifier U24.3 continuously receives the signal of the secondary side output CN5 of the zero-sequence current transformer. Since the leakage current is extremely small, the signal amplified by the differential amplifier U24.3 is not enough to trigger any action of the control module, and the whole system is in a normal operation state and the circuit remains conducting;

[0061] For leakage protection, the vector sum of the primary side currents of the zero-sequence current transformer is no longer zero, and a corresponding voltage signal will be induced across both ends of CN5 at the secondary side output. The voltage signal is amplified by the differential amplifier U24.3 and then transmitted to the control module. At the same time, it is also transmitted to the IN1 and IN2 pins of the leakage protection chip U28 in the trip module;

[0062] 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;

[0063] After receiving the high-level signal, the trip unit Q5 conducts, driving the trip mechanism to act, thereby cutting off the circuit and realizing the leakage protection of the circuit.

[0064] The above has introduced in detail a certain one disclosed in the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An Internet of Things leakage circuit breaker with leakage disabling function, characterized in that: include: A control module controls the enabling and disabling of the leakage function of the circuit breaker through the CPU; 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; The leakage current acquisition module acquires the leakage current signal in the circuit through the zero-sequence mutual inductor; The leakage disabling module includes a single-pole double-throw switch U38 and a first power supply unit; the leakage disabling module is used to achieve leakage disabling; after receiving the instruction, the control module outputs a high-level signal to the ENB pin of the single-pole double-throw switch U38, the B pin of the single-pole double-throw switch U38 is connected to the A1 pin, and the secondary side output CN5 of the zero-sequence transformer is short-circuited with the resistor R127; the leakage protection chip U28 cannot reach the voltage threshold and will not trigger the tripping action, thereby achieving the disabling of the leakage function; 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. 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 any one of claims 1 to 6, characterized in that: Here are the 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, 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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