CN109167332B - Safe leakage protection method - Google Patents
Safe leakage protection methodDownload PDFInfo
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- CN109167332B CN109167332BCN201811078999.6ACN201811078999ACN109167332BCN 109167332 BCN109167332 BCN 109167332BCN 201811078999 ACN201811078999 ACN 201811078999ACN 109167332 BCN109167332 BCN 109167332B
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- module
- leakage
- control module
- leakage protector
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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
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
- 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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- Emergency Protection Circuit Devices (AREA)
Abstract
Description
Technical Field
The invention relates to the field of electrical safety, in particular to a safe leakage protection method.
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 leakage protector can detect whether the zero line, the live line and the ground line leak electricity or not at the same time, in actual use, when the leakage protector is damaged, a user often has the trouble of replacing a new leakage protector, cuts off the leakage protector, directly connects a power line head to commercial power or replaces a cheap inferior product, so that a leakage protection system is similar to a nominal one, and the user is exposed to the risk of electric shock.
Disclosure of Invention
First, technical problem to be solved
Aiming at the defects in the prior art, the safety of the existing leakage protection system is low.
Second, technical scheme
In order to solve the above problems, there is provided a safe leakage protection method implemented by a leakage protection system comprising: a leakage protector and a load control module;
the leakage protector provides working voltage for the load control module;
the leakage protector is used for switching off or switching on a power supply of a load;
the leakage protector can send out an identification signal;
the method comprises the following steps:
the load control module forbids the load function module to work;
then the leakage protector sends out an identification signal;
then the load control module receives the identification signal and compares the signal with the pre-stored information: and if the identification signal is consistent with the prestored information, the load control module releases the power supply which is forbidden to be switched on.
Wherein, earth-leakage protector includes:
the action module is used for switching off or switching on the power supply;
the leakage protection control module is used for controlling the action module to switch off or switch on the power supply;
the leakage detection module is used for detecting whether the ground wire, the live wire and the zero line leak electricity or not, when the leakage is detected, the leakage detection module sends out a leakage signal, and after the leakage protection control module receives the leakage signal, the leakage protection control module controls the action module to disconnect the power supply.
The leakage protector further comprises a low-voltage power supply module, and the low-voltage power supply module is used for supplying power to the load control module.
If the identification signal is consistent with the pre-stored information, the load control module can also send a power-on permission signal to the leakage protector;
wherein the earth leakage protector inhibits turning on the power supply to the load until the earth leakage protector receives the power-on permission signal.
The leakage protector further comprises an alternating current input module, the alternating current input module is electrically connected with a mains supply, the alternating current input module is further electrically connected with the low-voltage power supply module and the action module respectively, and the alternating current input module is used for providing alternating current.
The leakage protector further comprises a port module, and the load control module is in communication connection with the leakage protection control module through the port module.
The port module comprises a signal isolation module, and the signal isolation module is used for electrically isolating the input end and the output end of a signal.
Wherein, the load control module is a water heater controller.
Wherein, the load function module is a heating rod.
Wherein the identification signal is a product code.
The invention has the advantages of
Compared with the prior art, the product code of the leakage protector is verified through the water heater controller, and the leakage protector is forbidden to be electrified before the product code passes the verification, so that a user cannot replace the leakage protector privately, the risk of electric shock of the user is reduced, and the use safety is improved;
the product code of the leakage protector is verified through the water heater controller, and the operation of the heating rod of the water heater is forbidden before the verification is passed or not, so that even if a user replaces the leakage protector in a private mode or cuts the leakage protector, the power line of the water heater is directly connected with commercial power, the water heater cannot work normally, the user is prevented from using a fake and fake leakage protector or directly inserting the power line of the water heater into a socket, the risk of electric shock of the user is greatly reduced, and the use safety is improved;
drawings
FIG. 1 is a block diagram of a leakage protector according to the present invention;
FIG. 2 is a block diagram ofembodiment 1 of the present invention;
FIG. 3 is a flowchart ofembodiment 1 of the present invention;
FIG. 4 is a circuit diagram of an action module of the present invention;
FIG. 5 is a circuit diagram of a low voltage power supply module of the present invention;
FIG. 6 is a circuit diagram of the leakage detection module of the present invention;
FIG. 7 is a circuit diagram of the leakage protection control module of the present invention;
FIG. 8 is a circuit diagram of an AC input module of the present invention;
FIG. 9 is a circuit diagram of a port module of the present invention;
FIG. 10 is a circuit diagram of the load control module of the present invention;
FIG. 11 is a circuit diagram of a display module of the present invention;
fig. 12 is a block diagram ofembodiment 2 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.
In the specific embodiment of the invention, the invention is applied to a water heater, the load is the water heater, and the load control module is a water heater controller;
the water heater controller is a water heater control circuit which is formed by taking an IC with the model number of HD6273 as a core;
the leakage protection control module is a leakage protector control circuit which is formed by taking an IC with the model number of HT66F018 as a core.
Example 1:
as shown in fig. 1, after power-on, the ac input module provides working voltage for the action module, the leakage detection module and the low-voltage power supply module, and the low-voltage power supply module provides working voltage for the leakage protection control module and the port module; the port module comprises a signal isolation module which is used for electrically isolating the input end and the output end of the signal.
As shown in fig. 2, the leakage protector is in communication connection with the control board of the water heater, the leakage protector is also electrically connected with the relay of the water heater, the control board of the water heater is also in communication connection with the relay and the display board of the water heater respectively, and the relay is electrically connected with the heating rod;
the leakage protector also provides working voltage for the water heater control panel, the water heater controller is arranged on the water heater control panel, a control button is further arranged on the water heater control panel, the control button is in communication connection with the water heater controller, and a display module used for displaying the temperature of the water tank is arranged on the water heater display panel.
The load function module refers to a module for realizing main functions of the electric appliance, for example, the function module of the water heater is a heating rod for heating water, and the function module of the refrigerator is a compressor for refrigerating;
as shown in figures 3 to 10 of the drawings,
after the power is on, the water heater control chip U3 prohibits the function module of the water heater from working, namely the water heater control chip U3 prohibits the heating rod of the water heater from working;
the leakage protection control chip U2 prohibits the power-on coil RL1 from being powered on, sends a product code to the water heater control chip U3 through the port module, the water heater control chip U3 compares the product code with a prestored product code after receiving the product code, and if the comparison result is consistent, the water heater control chip U3 releases the prohibition of the work of a heating rod of the water heater and sends a power-on permission signal; if the comparison result is inconsistent, the operation of the heating rod is kept forbidden;
under the state that the leakage protection control chip U2 prohibits the power-on coil RL1 from being powered on, the leakage protection control chip U2 ignores all power-on requests including but not limited to the user pressing a reset key on the leakage protector;
when a plurality of product codes are prestored, the product code sent by the leakage protection control chip U2 is consistent with one of the prestored product codes, and it is worth mentioning that a program for identifying and comparing the product codes is recorded in the water heater control chip U3;
the identification signal in this embodiment is a product code, which is only one situation in actual use, and a person skilled in the art may replace the product code with a preset authentication password or other codes according to actual needs, which is not limited herein.
Before the water heater chip U3 receives the product code sent by the leakage protection control chip U2, the water heater chip U3 will prohibit the functional module of the water heater from working.
The product code of the leakage protector is verified through the water heater controller, and the operation of the heating rod of the water heater is forbidden before the verification is passed or not, so that even if a user replaces the leakage protector in a private mode or cuts the leakage protector off, the power line of the water heater is directly connected with commercial power, the water heater cannot work normally, the user is prevented from using a fake and fake leakage protector or directly inserting the power line of the water heater into a socket, the risk of electric shock of the user is greatly reduced, and the use safety is improved;
when the mutual inductor ZCT1 or the mutual inductor ZCT2 detects a leakage signal, the single chip microcomputer U1 sends the leakage signal to the leakage protection control chip U2, and the leakage protection control chip U2 controls a power supply cut off by the trip coil RL2 after receiving the leakage signal; if the earth wire leaks electricity, the LED lamp DL2 in the alternating current input module is lightened to remind a user that the earth wire is electrified;
after the leakage signal disappears, a user needs to manually press the switch S1 to reset, the power supply is restarted after the reset, and then the singlechip U2 controls the power supply coil RL1 to be connected with the power supply of the water heater, so that the safety is further improved.
As shown in FIG. 11, the display module on the display panel is connected with the water heater control chip U3 in a communication way, and the display module can display the real-time temperature of the water tank.
The product code of the leakage protector is verified through the water heater controller, and the leakage protector is forbidden to be electrified before verification, so that a user cannot replace the leakage protector privately, the risk of electric shock of the user is reduced, and the use safety is improved.
Example 2:
as shown in fig. 12, the leakage protector is in communication connection with the water heater display panel, the water heater display panel is also in communication connection with the water heater control panel, and the water heater power supply module provides 5V and 12V working voltages for the water heater display panel and the water heater control panel respectively.
In this implementation, a user needs to press a reset key on the leakage protector to manually power on, the water heater chip U3 prohibits the heating rod of the water heater from working, the leakage protection control chip U2 controls the power-on coil RL1 to be powered on, and sends a product code to the water heater control chip U3 through the port module, after the water heater control chip U3 receives the product code, the product code is compared with a prestored product code, and if the comparison result is consistent, the water heater control chip U3 cancels the prohibition of the heating rod of the water heater from working.
When heating is needed, a water heater control chip U3 arranged on a water heater display panel controls the water heater control panel to switch on a 220V power supply for the heating rod.
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 (10)
1. A method of secure earth leakage protection, characterized in that it is implemented by an earth leakage protection system comprising: a leakage protector and a load control module;
the leakage protector provides working voltage for the load control module;
the leakage protector is used for switching off or switching on a power supply of a load;
the leakage protector can send out an identification signal;
the earth leakage protector includes:
the action module is used for switching off or switching on the power supply;
the leakage protection control module is used for controlling the action module to be switched off or switched on;
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 after the leakage protection control module receives the leakage signal, the leakage protection control module controls the action module to disconnect the power supply;
the method comprises the following steps:
the load control module forbids the load function module to work;
then the leakage protector sends out an identification signal;
then the load control module receives the identification signal and compares the signal with the pre-stored information: and if the identification signal is consistent with the prestored information, the load control module releases the power supply which is forbidden to be switched on.
2. A method as claimed in claim 1, wherein the earth-leakage protector further comprises a low-voltage power module for supplying power to the load control module.
3. A method as claimed in claim 1, wherein if the identification signal matches the pre-stored information, the load control module further sends a power-on permission signal to the earth leakage protector.
4. A method of providing earth leakage protection as claimed in claim 3, wherein said earth leakage protector inhibits power to the load from turning on until said earth leakage protector receives a power-up enabling signal.
5. A safety leakage protection method according to claim 2, wherein the leakage protector further comprises an ac input module, the ac input module is electrically connected to the commercial power, the ac input module is further electrically connected to the low voltage power module and the action module, respectively, and the ac input module is configured to provide ac power.
6. A method as claimed in claim 1, wherein the earth leakage protector further comprises a port module, and the load control module is communicatively connected to the earth leakage protection control module through the port module.
7. A method as claimed in claim 6, wherein said port module comprises a signal isolation module for electrically isolating the input and output of the signal.
8. A safety leakage protection method according to claim 4, wherein said load control module is a water heater controller.
9. A method of claim 8, wherein the load function module is a heater bar.
10. A method of safeguarding against electrical leakage as claimed in claim 1, wherein the identification signal is a product code.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811078999.6ACN109167332B (en) | 2018-09-17 | 2018-09-17 | Safe leakage protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811078999.6ACN109167332B (en) | 2018-09-17 | 2018-09-17 | Safe leakage protection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109167332A CN109167332A (en) | 2019-01-08 |
| CN109167332Btrue CN109167332B (en) | 2020-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811078999.6AActiveCN109167332B (en) | 2018-09-17 | 2018-09-17 | Safe leakage protection method |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7612654B2 (en)* | 2004-09-10 | 2009-11-03 | Cooper Technologies Company | System and method for circuit protector monitoring and management |
| CN205620487U (en)* | 2016-05-06 | 2016-10-05 | 国家电网公司 | Detection apparatus for earth -leakage protector |
| CN108387006A (en)* | 2018-04-24 | 2018-08-10 | 余姚市嘉荣电子电器有限公司 | A kind of water heater leakage protection system of double-direction control |
- 2018
- 2018-09-17CNCN201811078999.6Apatent/CN109167332B/enactiveActive
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| CN109167332A (en) | 2019-01-08 |
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