CN108400571B - Leakage protector with leakage alarm - Google Patents
Leakage protector with leakage alarm Download PDFInfo
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- CN108400571B CN108400571B CN201810372392.2A CN201810372392A CN108400571B CN 108400571 B CN108400571 B CN 108400571B CN 201810372392 A CN201810372392 A CN 201810372392A CN 108400571 B CN108400571 B CN 108400571B
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- Prior art keywords
- leakage
- module
- alarm
- resistor
- capacitor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/042—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned combined with means for locating the fault
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/14—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to occurrence of voltage on parts normally at earth potential
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
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- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a leakage protector with leakage alarm, relating to the technical field of leakage protectors, comprising: the device comprises an action module, a leakage protection control module, a leakage detection module and a leakage alarm module; the action module is used for disconnecting the power supply; the leakage protection control module is used for controlling the action module to cut off the power supply; the leakage detection module is used for detecting whether the ground wire, the live wire and the zero wire leak electricity or not, when the leakage is detected, the leakage detection module sends out a leakage signal, and the leakage protection control module sends out a power-off signal after receiving the leakage signal; the action module disconnects the power supply after receiving the power-off signal; compared with the prior art, the leakage alarm module sends an alarm after receiving the power-off signal, the leakage protector not only cuts off the power supply of the load, but also sends an alarm through the leakage alarm module, and the leakage alarm module can stop alarming only when the leakage alarm module is powered off, so that the leakage protector is safer.
Description
Technical Field
The invention relates to the technical field of leakage protectors, in particular to a leakage protector capable of giving an alarm when leakage occurs.
Background
Along with the improvement of living standard, the popularization rate of household water heaters is higher and higher, and the electric shock event of using the water heaters is also rare, so that the water heaters need a leakage protector to protect the safety of users, and the existing leakage protector has a plurality of defects.
The leakage protection device with ground wire live protection disclosed in CN3178492A of china includes three poles of phase line L, zero line N and ground line E with switches, zero sequence current transformers passing through the phase line L and the zero line N, test circuits, releases, rectification circuits, power supply step-down and silicon controlled rectifiers, a current detector and a dual input end amplifier, wherein one end of a primary coil of the current detector is connected with the ground line E, the other end of the primary coil of the current detector is connected with the zero line N after being connected in series with a large resistance current limiting step-down circuit, a secondary coil of the current detector is connected with one input end of the dual input end amplifier, two output ends of the dual input end amplifier are respectively connected with trigger electrodes of the two silicon controlled rectifiers, and the output end of the zero sequence current transformer is connected with the other input end of the dual input end amplifier; although the invention can detect whether the zero line, the live line and the ground wire are leaked or not at the same time, the invention only cuts off the power supply when the leakage occurs, and the user does not know the power failure of the water heater caused by any reason, so that the user is likely to try to electrify the water heater again under the condition of not solving the leakage point problem, and the user is directly exposed to the risk of electric shock.
Disclosure of Invention
First, technical problem to be solved
The problem that the safety of the household appliance is low is solved aiming at the defects in the prior art.
Second, technical scheme
In order to solve the above problems, a leakage protector for leakage alarm is provided, comprising: the device comprises an action module, a leakage protection control module, a leakage detection module and a leakage alarm module;
the action module is used for disconnecting the power supply;
the leakage protection control module is used for controlling the action module to cut off the power supply;
the leakage detection module is used for detecting whether the ground wire, the live wire and the zero wire leak electricity or not, when the leakage is detected, the leakage detection module sends out a leakage signal, and the leakage protection control module sends out a power-off signal after receiving the leakage signal;
the action module disconnects the power supply after receiving the power-off signal; the electric leakage alarm module sends out an alarm after receiving the power-off signal;
the electric leakage alarm module receives the power-off signal and then continuously gives an alarm until the electric leakage alarm module is powered off;
the electric leakage alarm module comprises an alarm generating unit, an optocoupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a first triode and a second triode;
an emitting electrode of the optocoupler is electrically connected with a first end of a first resistor, a second end of the first resistor is electrically connected with a base electrode of a first triode and a first end of a first capacitor respectively, a collector electrode of the first triode is electrically connected with a first end of an alarm generating unit, a second end of the alarm generating unit is electrically connected with a first end of a second resistor and a first end of a third resistor respectively, a second end of the third resistor is electrically connected with a first end of a second capacitor and a base electrode of a second triode respectively, a collector electrode of the second triode is electrically connected with a first end of a fourth resistor and a first end of a fifth resistor respectively, a second end of the fourth resistor is electrically connected with a first end of the first capacitor, and a second end of the first capacitor, an emitting electrode of the first triode and a second end of the fifth resistor are electrically connected with a zero line;
the electric leakage alarm module is in communication connection with the leakage protection control module through an optical coupler;
the first capacitor and the second capacitor are used for preventing the false triggering of the electric leakage alarm module.
Wherein, the alarm generating unit is an LED indicator light.
Wherein, the alarm generating unit is a buzzer.
The leakage protector further comprises a temperature detection module, the temperature detection module is used for detecting the temperature between the plug pin and the socket, and when the temperature exceeds a preset value, the temperature detection module controls the action module to disconnect the power supply.
Thirdly, the invention has the beneficial effects
Compared with the prior art, when the leakage detection module detects leakage, the leakage protector not only cuts off the power supply of the load, but also gives an alarm through the leakage alarm module, and the leakage alarm module can stop alarming only by powering off the leakage alarm module; and the electric leakage alarm module is electrically isolated from other modules by an isolation circuit in the electric leakage alarm module, so that the invention is safer.
Drawings
FIG. 1 is a diagram of the connection relationship of the main modules of the present invention;
fig. 2 is a circuit diagram of embodiment 1 of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1:
in the present embodiment, the present invention is applied to a water heater.
As shown in fig. 1, the leakage protection control module is electrically connected with the action module, the leakage detection module and the leakage alarm module respectively.
As shown in fig. 2, when the zero-sequence current transformer ZCT1 detects that there is leakage in the zero line or the live line, the induced voltage is respectively input to port 1 and port 2 of the integrated chip U1, when the leakage current strength reaches a preset value, port 5 charges the capacitor C5 in a constant current manner, when the capacitor voltage reaches a preset value, port 7 outputs a high level, that is, the integrated chip U1 sends a power-off signal, the diode D3 triggers the SCR to turn on, and the trip coil L1 is energized, so that the switch S1 is turned off; meanwhile, a power-off signal is transmitted to the leakage alarm module through the optocoupler U2, the leakage alarm module enters an alarm state after receiving the power-off signal, namely, an indicator light LED is turned on, the leakage alarm module is locked in the alarm state through a triode Q1 and a triode Q2, and the alarm state can be relieved only when the leakage alarm module is powered off, namely, a plug of the leakage protector is pulled out; the capacitor C13 and the capacitor C10 are used for preventing the false triggering of the electric leakage alarm module; the electric leakage module is in communication connection with the integrated chip U1 through the optical coupler U2, namely the output end and the input end of a signal are insulated, so that the safety protection circuit is safer.
The indicator light LED can be replaced by components which give out sound and light alarm, such as a buzzer and the like.
When the earth wire current transformer ZCT2 detects that the earth wire has electric leakage, the induced voltage is respectively input into the 2 port and the 4 port of the integrated chip U1, when the intensity of the electric leakage current reaches a preset value, the port 6 charges the capacitor C6 in a constant current mode, when the voltage of the capacitor reaches the preset value, the 7 port outputs high level, the SCR is triggered by the diode D3 to be conducted, the trip coil L1 is electrified, the S1 is disconnected, and meanwhile, the electric leakage alarm module enters an alarm state.
Example 2:
as shown in fig. 1, the invention further includes a temperature detection module, the temperature detection module is electrically connected to the action module, the temperature detection module is used for detecting the temperature between the pin and the socket, when the temperature exceeds a preset value, the temperature detection module turns on the silicon controlled rectifier SCR, and the trip coil L1 is energized, so that the switch S1 is turned off, and the electric leakage alarm module does not enter an alarm state.
The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention is defined by the claims.
Claims (4)
1. A leakage protector with leakage alarm, said leakage protector comprising: the device comprises an action module, a leakage protection control module, a leakage detection module and a leakage alarm module;
the action module is used for disconnecting the power supply;
the leakage protection control module is used for controlling the action module to cut off the power supply;
the leakage detection module is used for detecting whether the ground wire, the live wire and the zero line have electric leakage or not, when the electric leakage is detected, the leakage detection module sends out a leakage signal, and the leakage protection control module sends out a power-off signal after receiving the leakage signal;
the action module disconnects the power supply after receiving the power-off signal; the electric leakage alarm module sends an alarm after receiving the power-off signal;
the electric leakage alarm module continuously gives an alarm after receiving the power-off signal until the electric leakage alarm module is powered off;
the electric leakage alarm module comprises an alarm generating unit, an optical coupler, a first resistor (R3), a second resistor (R4), a third resistor (R5), a fourth resistor (R6), a fifth resistor (R11), a first capacitor (C13), a second capacitor (C10), a first triode (Q1) and a second triode (Q2);
an emitter of the optical coupler is electrically connected with a first end of the first resistor (R3), a second end of the first resistor (R3) is electrically connected with a base of the first triode (Q1) and a first end of the first capacitor (C13) respectively, a collector of the first triode (Q1) is electrically connected with a first end of the alarm generating unit, a second end of the alarm generating unit is electrically connected with a first end of the second resistor (R4) and a first end of the third resistor (R5) respectively, a second end of the third resistor (R5) is electrically connected with a first end of the second capacitor (C10) and a base of the second triode (Q2) respectively, a collector of the second triode (Q2) is electrically connected with a first end of the fourth resistor (R6) and a first end of the fifth resistor (R11) respectively, and a second end of the fourth resistor (R6) is electrically connected with a first end of the first capacitor (C13), the second end of the first capacitor (C13), the emitter of the first triode (Q1) and the second end of the fifth resistor (R11) are all electrically connected with the zero line;
the electric leakage alarm module is in communication connection with the leakage protection control module through the optocoupler;
the first capacitor (C13) and the second capacitor (C10) are used for preventing the false triggering of the electric leakage alarm module.
2. A leakage protector with leakage alarm as claimed in claim 1, wherein the alarm generating unit is an LED indicator.
3. A leakage protector with leakage alarm according to claim 1, wherein the alarm generating unit is a buzzer.
4. A leakage protector with leakage alarm as claimed in claim 1, further comprising a temperature detection module for detecting the temperature between the pin and the socket, wherein the temperature detection module controls the action module to disconnect the power supply when the temperature exceeds a preset value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810372392.2A CN108400571B (en) | 2018-04-24 | 2018-04-24 | Leakage protector with leakage alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810372392.2A CN108400571B (en) | 2018-04-24 | 2018-04-24 | Leakage protector with leakage alarm |
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| Publication Number | Publication Date |
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| CN108400571A CN108400571A (en) | 2018-08-14 |
| CN108400571B true CN108400571B (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810372392.2A Active CN108400571B (en) | 2018-04-24 | 2018-04-24 | Leakage protector with leakage alarm |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066583B (en) * | 2018-09-17 | 2023-09-12 | 余姚市嘉荣电子电器有限公司 | Safe electric leakage protection system |
| CN110297156B (en) * | 2019-08-15 | 2024-04-05 | 山东凌宝智能科技有限公司 | Circuit and method for detecting electric leakage through electric leakage voltage |
| CN114442020A (en) * | 2020-11-06 | 2022-05-06 | 余姚市嘉荣电子电器有限公司 | Leakage protector calibration method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200821609A (en) * | 2006-11-10 | 2008-05-16 | Prodigit Electronics Co Ltd | Digital electric leakage detection monitoring device |
| CN105576603A (en) * | 2016-01-05 | 2016-05-11 | 余姚市嘉荣电子电器有限公司 | Double-input leakage protector |
| CN106253217A (en) * | 2016-09-07 | 2016-12-21 | 余姚市嘉荣电子电器有限公司 | A kind of earth leakage protective device and method of work thereof |
| CN206209036U (en) * | 2016-11-30 | 2017-05-31 | 佛山奇正电气有限公司 | A kind of leakage-current alarm circuit |
| CN107154612A (en) * | 2017-07-18 | 2017-09-12 | 余姚市嘉荣电子电器有限公司 | A kind of dual input circuit for electric leakage protector |
| CN107769158A (en) * | 2017-09-27 | 2018-03-06 | 余姚市嘉荣电子电器有限公司 | A kind of safe leakage protection circuit |
| CN208094162U (en) * | 2018-04-24 | 2018-11-13 | 余姚市嘉荣电子电器有限公司 | A kind of earth leakage protective device of leakage-current alarm |
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- 2018-04-24 CN CN201810372392.2A patent/CN108400571B/en active Active
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| CN108400571A (en) | 2018-08-14 |
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