CN210401617U - Power-off type electric leakage indicating device adopting electric leakage management chip - Google Patents

Power-off type electric leakage indicating device adopting electric leakage management chip Download PDF

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Publication number
CN210401617U
CN210401617U CN201921108181.4U CN201921108181U CN210401617U CN 210401617 U CN210401617 U CN 210401617U CN 201921108181 U CN201921108181 U CN 201921108181U CN 210401617 U CN210401617 U CN 210401617U
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leakage
circuit
electric leakage
power
chip
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CN201921108181.4U
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Chinese (zh)
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杨晓松
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Nanjing Yuji Electric Technology Co ltd
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Nanjing Yuji Electric Technology Co ltd
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Abstract

The utility model relates to an adopt outage formula electric leakage indicating device of electric leakage management chip, including electric leakage indicator and current transformer, current transformer suit is in the electric wire outside, the electric leakage indicator includes the casing and sets up the PCB board in the casing, integrated central processing unit has on the PCB board still integrated electric leakage management chip, signal acquisition circuit, voltage stabilizing circuit, double-circuit transformer and reset circuit on the PCB board, electric leakage management chip passes through signal acquisition circuit and links to each other with central processing unit's signal input part, voltage stabilizing circuit links to each other with the electric leakage management chip, central processing unit's output links to each other with reset circuit, reset circuit links to each other with the electric leakage management chip. The utility model has the advantages that can find transient state electric leakage characteristic fast to the accurate electric leakage point of discovering accomplishes not have the mistake and reports, does not have the hourglass and reports.

Description

Power-off type electric leakage indicating device adopting electric leakage management chip
Technical Field
The utility model relates to an electric leakage indicating device, concretely relates to adopt outage formula electric leakage indicating device of special electric leakage management chip.
Background
It is known that leakage is current leakage due to insulation damage or other causes. The electric leakage can be generated when the electric appliance shell is communicated with a live wire of a mains supply for a certain reason and then the electric appliance shell is in a certain potential difference with the ground.
At present, the power supply systems of vast rural areas and urban villages in China generally have the leakage phenomenon, and at least the rural power supply systems are required to be put into total leakage protection in three-level leakage protection according to the national regulations. However, due to the intermittent characteristics of electric leakage, the electric leakage point is difficult to accurately position in time, so that the total leakage protection in many places cannot be put into use, the power supply safety and the life and property safety of residents are seriously threatened, and the annual average number of electric shock injuries and deaths in the Xuzhou region is more than 10.
In order to solve the problem of the power supply company, the applicant develops the power-off leakage indicator. The product can timely and accurately capture the transient waveform of the electric leakage in a very short time (generally 2-3 milliseconds) before the total leakage protection and the electric jump are caused by the electric leakage, identify the electric leakage characteristic, determine the electric leakage point and give an alarm.
Through retrieval, the Chinese patent with the publication number of CN108828392A discloses a power-off leakage signal identification method and a power-off leakage indicating device, which mainly describe that after the leakage signal is subjected to the processes of differential amplification, operational amplifier rectification, comparison processing by a single-path comparator and the like, an input signal which can be accepted by an MCU is obtained, whether the leakage signal is a leakage characteristic signal is judged by the MCU, and a leakage judgment result is obtained by combining power-off judgment; chinese patent publication No. CN109633356A discloses another power-off leakage signal identification method and power-off leakage indication device, which performs differential voltage bias on a leakage waveform signal, stepping differential amplification of an input signal, integral filtering, comparison with a two-way comparator, and comparison operation with a preceding-stage output analog voltage, so that positive and negative waves relative to the bias voltage are both corrected into square waves in a positive voltage range by the comparator, or operation is performed on the two-way comparison square waves, and after the leakage characteristics are confirmed by an MCU high-speed comparison and identification algorithm, a power-off criterion is added at the same time to determine whether the signal is a leakage signal. Both of the above two methods are leakage detection methods constructed by discrete components, and the circuit structure is complicated.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the problem that prior art exists, provide a outage formula electric leakage indicating device, the device adopts special electric leakage management chip to replace original complicated circuit structure.
The utility model provides an adopt outage formula electric leakage indicating device of electric leakage management chip, includes electric leakage indicator and current transformer (CT for short), the current transformer suit is in the electric wire outside, the electric leakage indicator includes the casing and sets up the PCB board in the casing, integrated central processing unit (MCU for short) on the PCB board still integrated electric leakage management chip, signal acquisition circuit, voltage stabilizing circuit, double-circuit transformer and reset circuit on the PCB board, electric leakage management chip passes through signal acquisition circuit and links to each other with central processing unit's signal input part, voltage stabilizing circuit links to each other with the electric leakage management chip, provides the power for the electric leakage management chip, central processing unit's output links to each other with reset circuit, reset circuit links to each other with the electric leakage management chip.
The utility model discloses in, signal acquisition circuit provides high level signal input for MCU, can be with the high level signal input MCU who gathers from the electric leakage management chip, MCU obtains this signal after, sends the electric leakage warning through handling. The utility model discloses a be used for earth leakage protection equipment leakage detection's special chip M54123, this chip carries out transient state processing through the electric leakage wave form that detects, directly gives the electric leakage signal level that can supply MCU to use, the utility model discloses because the detection chip that special earth leakage protection used has been adopted, so can not carry out processing such as stepping amplification in the intermediate link like the scheme that the former used discrete component, and the M54123 chip need provide 12-18V mains operated, provides certain higher requirement to the power supply of circuit. The utility model discloses an adopt M54123 to leak to protect special chip and carry out another kind of electric leakage transient state detection implementation mode that transient state electric leakage detected, setting to stepping electric leakage detection and setting the occasion that does not have the requirement, there is the possibility of being suitable for.
Preferably, the leakage management chip is an M54123 chip.
Preferably, the PCB board is further integrated with a voltage stabilizing unit circuit, a battery charging circuit, a battery power-off switching circuit, and a mains power failure detection circuit.
Preferably, the voltage stabilizing unit circuit is connected with the central processing unit and supplies power to the MCU and the peripheral circuit.
Preferably, one path of the two-path transformer is connected with a voltage stabilizing unit circuit for supplying power to the mainboard and the periphery of the MCU, and the other path of the two-path transformer is connected with a voltage stabilizing circuit for supplying power to a voltage stabilizing block of the M54123 chip.
Preferably, the battery charging circuit, the battery power-off switching circuit and the mains supply power-off detection circuit are all connected with the central manager.
Preferably, the shell is provided with an indicator light, a key, a buzzer and an infrared receiver which are respectively electrically connected with the central processing unit.
Preferably, an interface is arranged on a shell of the leakage indicator, and a signal wire of the current transformer passes through the interface and is connected with the M54123 chip.
The utility model has the advantages that can find transient state electric leakage characteristic fast to the accurate electric leakage point of discovering accomplishes not have the mistake and reports, does not have the hourglass and reports.
Drawings
The present invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic view of the structure of the housing of the present invention.
Fig. 2 is a logic block diagram of the present invention.
Fig. 3 is a circuit diagram of the M54123 signal acquisition circuit of the present invention.
Fig. 4 is a circuit diagram of the cpu MCU and peripheral circuits of the present invention.
Fig. 5 is a circuit diagram of the M54123 reset circuit of the present invention.
Fig. 6 is a circuit diagram of the middle voltage stabilizing circuit of the present invention.
Fig. 7 is a circuit diagram of the middle double-path transformer of the present invention.
Fig. 8 is a circuit diagram of the voltage stabilizing unit circuit for supplying power to the MCU and the peripheral circuit.
Fig. 9 is a circuit diagram of the power-off switching circuit of the battery of the present invention.
Fig. 10 is a circuit diagram of the power down detection circuit for the medium mains supply of the present invention.
Description of reference numerals: 1. leakage indicator 2, current transformer 3, switch 4, button, 5, reset signal receiving window, 6, red, yellow and green warning indicator lamp, 100, casing, 101, PCB board.
Detailed Description
Example 1
The embodiment provides a power-off type leakage indicating device adopting a leakage management chip, which is structurally shown in fig. 1 and comprises a leakage indicator 1 and a current transformer 2 (CT for short), wherein the current transformer 2 is sleeved on the outer side of an electric wire and used for acquiring residual waveforms of a circuit, and the electric wire comprises a live zero line in a single-family electric meter box, a three-phase line + a zero line in a multi-family electric meter box, an incoming cable, a line cable, an overhead line (special-made) and the like. The leakage indicator comprises a shell 100 and a PCB 101 arranged in the shell 100, wherein the shell 100 is provided with a power switch 3, a key 4, a reset signal receiving window 5, a red, yellow and green alarm indicator lamp 6, a buzzer, an infrared receiver and the like which are respectively electrically connected with a central processing unit. Wherein, 1 of the red, yellow and green alarm indicator lamp 6 is a power supply display lamp, 2 is an internal leakage indicator lamp, and 3 is a leakage jump positioning indicator lamp. The casing 100 of the leakage indicator 1 is provided with a special interface, and two signal wires extending out from the current transformer 2 are connected with the M54123 chip through the interface.
The PCB 101 is integrated with an M54123 chip, an M54123 signal acquisition circuit, a central processing unit (MCU), a voltage stabilizing circuit, a voltage stabilizing unit circuit for supplying power to the MCU and peripheral circuits, a two-way transformer, an M54123 reset circuit, a battery charging circuit, a battery power-off switching circuit, a mains supply power failure detection circuit and other circuit structures. The M54123 chip is connected with a signal input end of the central processing unit through the M54123 signal acquisition circuit, and the M54123 signal acquisition circuit provides high-level signal input for the MCU. The M54123 chip can directly give a leakage signal level available for the MCU through transient processing of the detected leakage waveform, and outputs the leakage signal level to the GPIO pin of the MCU. One power supply of the two-way transformer is connected with a voltage stabilizing unit circuit, the voltage stabilizing unit circuit is connected with the central processing unit and used for supplying power to the MCU mainboard and the MCU periphery, the other power supply is connected with a voltage stabilizing circuit, and the voltage stabilizing circuit is directly connected with the M54123 chip and used for providing a 13V power supply for a voltage stabilizing block of the M54123 chip. The output end of the central processing unit is connected with the M54123 reset circuit, and the M54123 reset circuit is connected with the M54123 chip, so that the circuit reset of the M54123 chip can be controlled.
In addition, a battery is arranged on the PCB 101, and the battery, a battery charging circuit, a battery power-off switching circuit and a mains supply power-off detection circuit are all connected with the central manager. The battery is connected with the battery charging circuit, and the battery charging circuit is connected with the stabilized voltage power supply.
Because the voltage required by the MCU is different from that required by the M54123 chip, the embodiment adopts a double-way transformer, after the power supply passes through the double-way transformer, one way of output is used for supplying power to the MCU mainboard and peripheral circuits, and the other way of output is used for supplying power to the voltage stabilizing block of the M54123 chip. When electric leakage occurs, the M54123 signal acquisition circuit sends out a high level signal and transmits the high level signal to a GPIO pin of the MCU, and the MCU obtains the signal and sends out electric leakage alarm after processing. At the moment, the MCU needs to acquire a signal of the mains supply power failure detection circuit to judge whether the mains supply is powered off, if the mains supply is judged to be powered off within a plurality of milliseconds (requiring time longer than the action of the upper-level leakage protection, such as 600 milliseconds) after the electric leakage alarm, the MCU is determined as a positioning point of the upper-level leakage protection fault of the leakage tripping, and the indicator light displays a red light; otherwise, the commercial power is not powered down and is a common non-trip fault point, the indicating lamp displays a yellow lamp, and the MCU outputs a leakage signal. When the commercial power is lost, the MCU controls the battery power-losing switching circuit to start, and the battery is seamlessly switched to supply power so as to avoid the MCU from being restarted due to instantaneous power loss.
In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention.

Claims (8)

1. The utility model provides an adopt outage formula electric leakage indicating device of electric leakage management chip, includes electric leakage indicator and current transformer, current transformer suit is in the electric wire outside, the electric leakage indicator includes the casing and sets up the PCB board in the casing, the integration has central processing unit, its characterized in that on the PCB board: the PCB is further integrated with a leakage management chip, a signal acquisition circuit, a voltage stabilizing circuit, a double-circuit transformer and a reset circuit, the leakage management chip is connected with the signal input end of the central processing unit through the signal acquisition circuit, the voltage stabilizing circuit is connected with the leakage management chip, the output end of the central processing unit is connected with the reset circuit, and the reset circuit is connected with the leakage management chip.
2. A power-off leakage indicator using a leakage manager chip according to claim 1, wherein: the leakage management chip is an M54123 chip.
3. A power-off leakage indicator using a leakage manager chip according to claim 2, wherein: and the PCB is also integrated with a voltage stabilizing unit circuit, a battery charging circuit, a battery power-off switching circuit and a mains supply power-off detection circuit.
4. A power-off leakage indicator using a leakage manager chip according to claim 3, wherein: and the voltage stabilizing unit circuit is connected with the central processing unit.
5. The power-off leakage indicator using the leakage management chip according to claim 4, wherein: one path of the two-path transformer is connected with the voltage stabilizing unit circuit, and the other path of the two-path transformer is connected with the voltage stabilizing circuit.
6. A power-off leakage indicator using a leakage manager chip according to claim 3, wherein: and the battery charging circuit, the battery power-off switching circuit and the mains supply power failure detection circuit are all connected with the central manager.
7. A power-off leakage indicator using a leakage manager chip according to claim 2, wherein: the shell is provided with an indicator light, a key, a buzzer and an infrared receiver which are respectively electrically connected with the central processing unit.
8. A power-off leakage indicator using a leakage manager chip according to claim 2, wherein: an interface is arranged on the shell, and a signal wire of the current transformer penetrates through the interface to be connected with the M54123 chip.
CN201921108181.4U 2019-07-16 2019-07-16 Power-off type electric leakage indicating device adopting electric leakage management chip Active CN210401617U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921108181.4U CN210401617U (en) 2019-07-16 2019-07-16 Power-off type electric leakage indicating device adopting electric leakage management chip

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921108181.4U CN210401617U (en) 2019-07-16 2019-07-16 Power-off type electric leakage indicating device adopting electric leakage management chip

Publications (1)

Publication Number Publication Date
CN210401617U true CN210401617U (en) 2020-04-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921108181.4U Active CN210401617U (en) 2019-07-16 2019-07-16 Power-off type electric leakage indicating device adopting electric leakage management chip

Country Status (1)

Country Link
CN (1) CN210401617U (en)

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