Trickle charging early fire protection device

Abstract

The invention discloses a trickle charging early fire protection device, which relates to the technical field of electrical fire protection and comprises a current sampling module, a signal preprocessing module, a spectrum analysis module, a trickle judgment module, an abnormity judgment module, an alarm output module and an equipment context fusion unit which are connected in sequence, the current sampling module is installed on a main circuit of an electric box and used for collecting alternating current signals in real time, and the trickle charging early fire protection device solves the problem that trickle charging can only be discriminated and protected through an intermediate charger or a charging device in an existing charging network mode and cannot be discriminated and protected in a superior circuit. The problems that in an existing charging network mode, when an intermediate charger has a protection fault, charging abrupt change occurs, and a superior loop protection device cannot recognize and perform protection action are solved, and the hidden danger problem that in the existing charging network mode, protection cannot be performed and fire hazards are caused when an electric arc occurs in a no-load state is also solved.

Description

Technical Field

[0001] This invention relates to the field of electrical fire protection technology, and in particular to a trickle-charging early fire protection device. Background Technology

[0002] In the current field of electrical fire prevention, electrical fires caused by trickle charging are common. However, once the charging circuit enters the trickle charging state, the charging anomalies that occur cannot be monitored, identified, or protected by conventional electrical circuit protection devices. Further technologies are needed to identify trickle charging anomalies and provide safety protection for electrical circuits. This is to solve the problem that traditional electrical circuit protection devices cannot monitor and identify the charging anomalies caused by trickle charging and cannot protect the electrical circuit when anomalies occur in the trickle charging state. Summary of the Invention

[0003] The purpose of this invention is to solve at least one of the technical problems existing in the prior art, and to address the problems raised in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a trickle charging early fire prevention device, comprising a current sampling module, a signal preprocessing module, a spectrum analysis module, a trickle discrimination module, an anomaly determination module, an alarm output module, and a device context fusion unit connected in sequence.

[0005] Preferably, the current sampling module is installed on the main circuit of the electrical box for real-time acquisition of AC current signals, with a sampling frequency of not less than 1kHz and a resolution of not less than 10mA.

[0006] Preferably, the signal preprocessing module is connected to the current sampling module and is used to perform detrending, segmented windowing, and power frequency suppression processing on the original current signal.

[0007] Preferably, the spectrum analysis module is used to perform a fast Fourier transform (FFT) on the preprocessed current signal, calculate the power spectral density (PSD), and extract the following characteristic parameters.

[0008] Preferably, the trickle charging discrimination module determines whether the current state is trickle charging based on preset rules.

[0009] Preferably, when the anomaly detection module determines that the state is trickle charging, it further monitors the duration T and the current stability.

[0010] Preferably, the alarm output module is connected to the anomaly determination module and is used to send an anomaly reminder to the user's mobile phone via WIFI and to trigger the circuit breaker to cut off the abnormal circuit when an anomaly is determined.

[0011] Preferably, the device context fusion unit obtains the smart socket status via a local area network.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] (1) The trickle charging early fire protection device solves the problem that the existing charging network mode can only perform trickle charging identification and protection through intermediate chargers or charging devices, and cannot perform identification and protection in the upper-level circuit. It also solves the problem that when the intermediate charger protection fails, there is a sudden change in charging, and the upper-level circuit protection device cannot identify and cannot perform protection action. It also solves the problem that when an arc occurs under no-load in the existing charging network mode, protection cannot be performed, which causes a fire hazard. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0015] Figure 1 This is a structural schematic diagram of the connection diagram of the trickle charging early fire protection functional module of the present invention;

[0016] Figure 2 This is a schematic diagram of the flowchart of the trickle charging early fire prevention and monitoring method of the present invention. Detailed Implementation

[0017] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0018] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0019] In the description of this invention, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0020] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0021] Please see Figure 1-2 The present invention provides a technical solution: a trickle charging early fire protection device, comprising a current sampling module 1, a signal preprocessing module 2, a spectrum analysis module 3, a trickle discrimination module 4, an anomaly judgment module 5, an alarm output module 6, and a device context fusion unit 7 connected in sequence.

[0022] Furthermore, the current sampling module 1 is installed on the main circuit of the household distribution box to collect AC current signals in real time, with a sampling frequency of not less than 1kHz and a resolution of not less than 10mA; the signal preprocessing module 2 is connected to the current sampling module 1 and is used to perform detrending, segmented windowing and power frequency suppression processing on the original current signal.

[0023] Furthermore, the spectrum analysis module 3 is used to perform a Fast Fourier Transform (FFT) on the preprocessed current signal, calculate the power spectral density (PSD), and extract the following characteristic parameters:

[0024] Low-frequency energy percentage (Elow): The proportion of energy in the 0–5Hz frequency band to the total energy;

[0025] Total Harmonic Distortion (THD)

[0026] RMS current Irms and mean active power Pavg;

[0027] Power fluctuation standard deviation σP.

[0028] Furthermore, the trickle charging discrimination module 4 determines whether the current state is trickle charging based on preset rules, including the following criteria:

[0029] Pavg < 5W;

[0030] Irms < 0.1A;

[0031] Elow > 80%;

[0032] σP / Pavg<0.1.

[0033] Furthermore, after determining that the state is trickle charging, the anomaly detection module 5 further monitors its duration T and current stability. If any of the following conditions are met, it is determined to be an anomaly:

[0034] T>12 hours;

[0035] Irms > 80mA (corresponding to AC equivalent value);

[0036] THD suddenly increased to >10% and was accompanied by a significant increase in spectral entropy.

[0037] Furthermore, the alarm output module 6 is connected to the anomaly determination module 5, and is used to send an anomaly reminder to the user's mobile phone via WIFI and to link the circuit breaker to cut off the abnormal circuit when an anomaly is determined. The device context fusion unit 7 obtains the status of the smart socket through the local area network.

[0038] Furthermore, during operation, the current sampling module 1 collects the main circuit current at a sampling rate of 1.28kHz. After the preprocessing module 2 removes the trend term and adds a Hanning window, the current is sent to the spectrum analysis module 3 for 1024-point FFT. The anomaly judgment module 5 starts a timer. If the trickle charging condition is still met after 14 hours, it is judged as an "inferior charger long-term trickle charging" anomaly. The alarm output module 6 pushes a message to the user's mobile APP via Wi-Fi: "Abnormal long-term charging detected, please check the socket device," and the circuit breaker disconnects the circuit.

[0039] The contents or structures not described in detail in this specification are existing technologies known to those skilled in the art, and therefore will not be elaborated upon further.

[0040] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A trickle-charging early fire prevention device, characterized in that: It includes the current sampling module (1), signal preprocessing module (2), spectrum analysis module (3), trickle discrimination module (4), anomaly judgment module (5), alarm output module (6) and device context fusion unit (7) connected in sequence.

2. The trickle-charging early fire prevention device according to claim 1, characterized in that: The current sampling module (1) is installed on the main circuit of the electrical box and is used to collect AC current signals in real time. The sampling frequency is not less than 1kHz and the resolution is not less than 10mA.

3. The trickle-charging early fire prevention device according to claim 2, characterized in that: The signal preprocessing module (2) is connected to the current sampling module (1) and is used to perform detrending, segmented windowing and power frequency suppression processing on the original current signal.

4. The trickle-charging early fire prevention device according to claim 3, characterized in that: The spectrum analysis module (3) is used to perform a fast Fourier transform (FFT) on the preprocessed current signal, calculate the power spectral density (PSD), and extract the following characteristic parameters.

5. The trickle-charging early fire prevention device according to claim 4, characterized in that: The trickle charging discrimination module (4) determines whether the current state is trickle charging according to preset rules.

6. The trickle-charging early fire prevention device according to claim 5, characterized in that: When the anomaly determination module (5) determines that the state is trickle charging, it further monitors the duration T and current stability.

7. A trickle-charging early fire prevention device according to claim 6, characterized in that: The alarm output module (6) is connected to the anomaly determination module (5) and is used to send an anomaly reminder to the user's mobile phone via WIFI and to link the circuit breaker to cut off the abnormal circuit when an anomaly is determined.

8. The trickle-charging early fire prevention device according to claim 7, characterized in that: The device context fusion unit (7) obtains the status of the smart socket through the domain network.

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