CN109167335B - Safe leakage protection method - Google Patents
Safe leakage protection method Download PDFInfo
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- CN109167335B CN109167335B CN201811079006.7A CN201811079006A CN109167335B CN 109167335 B CN109167335 B CN 109167335B CN 201811079006 A CN201811079006 A CN 201811079006A CN 109167335 B CN109167335 B CN 109167335B
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- 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
- H02H3/26—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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Emergency Protection Circuit Devices (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The invention discloses a safe leakage protection method, which relates to the field of electrical safety and comprises the following steps: a leakage protector and a load control module; the leakage protector is used for switching off or switching on a power supply of a load; the earth leakage protector can send out identification signal, and after load control module received identification signal, with this signal and prestore information contrast: if the identification signal is consistent with the pre-stored information, the load control module sends a power-on permission signal to the leakage protector; the leakage protector forbids to switch on a power supply of the load until the leakage protector receives a power-on permission signal; 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 passing 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.
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, users often replace cheap inferior products when the leakage protector is damaged, so that the leakage protector is similar to a nominal leakage protector, and the users are 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 load control module can send out a power-on permission signal;
the method comprises the following steps:
firstly, the leakage protector forbids to switch on a power supply of a load;
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: if the identification signal is consistent with the pre-stored information, the load control module sends a power-on permission signal to the leakage protector;
and finally, after the leakage protector receives the power-on permission signal, the power supply of the load is released from being 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.
The leakage protection control module prohibits the action module from being connected with a power supply of the load until the leakage protection control module 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.
The leakage protector completes self-checking first, and when the self-checking result is normal, the leakage protector sends out an identification signal.
Wherein the identification signal is a product code.
Thirdly, the invention has the beneficial effects
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 is sent only after the leakage protector is normally self-checked, so that the product code cannot be sent when the leakage protector is abnormal, and the water heater cannot send a power-on permission signal to an abnormal water heater, and the use safety is further improved.
Drawings
FIG. 1 is a block diagram of a leakage protector according to the present invention;
FIG. 2 is a block diagram of embodiment 1 of the present invention;
FIG. 3 is a flowchart of embodiment 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 flowchart of embodiment 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 provides working voltage for the leakage protection control module and the port module.
As shown in fig. 2, the water heater controller is arranged on the display panel of the water heater, the leakage protector is in communication connection with the water heater through the port module, the leakage protector also provides working voltage for the water heater controller through the port module, the leakage protector is also electrically connected with the heating rod of the water heater, 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;
as shown in fig. 3 to 10, after power-on, the leakage protection control chip U2 prohibits the power-on coil RL1 from being 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, if the comparison result is consistent, the water heater control chip U3 sends a power-on permission signal, the prestored product code may be one or more, 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, the water heater control chip U3 sends a power-on permission signal, 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.
After the leakage protection control chip U2 receives the power-on permission signal, the leakage protection control chip U2 releases the power-on prohibition coil RL1 to switch on the power supply,
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;
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.
When water in the water tank needs to be heated, the water heater control chip U3 sends a heating signal to the leakage protection control chip U2 through the port module, and after the water heater control chip U3 receives the signal, the power-on coil RL1 is controlled to be powered on, so that the heating rod starts to heat;
when the water heater control chip U3 detects that the water temperature in the water tank reaches a preset temperature through a built-in temperature detection module of the water heater, the water heater control chip U3 sends a power-off signal to the leakage protection control chip U2 through a port module, and after the water heater control chip U3 receives the signal, the water heater control chip U3 controls a trip coil RL2 to cut off the power supply, so that the heating rod stops heating;
the leakage protector also has the function of a relay, the relay in the water heater is omitted, and the cost is reduced.
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 leakage protection control chip 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;
those skilled in the art will set the water heater controller on the water heater control board, and the functions described in this embodiment may also be implemented, which is not described herein.
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.
Example 2:
as shown in fig. 12, after power-on, the leakage protector first prohibits the power-on coil from connecting to the load power supply, and then performs a self-test procedure:
commercial power time sequence signal detection: as shown in fig. 4, in the utility power detection circuit composed of the resistor R5, the resistor R12, the resistor R24, and the zener diode ZD1, the leakage protection control chip U2 acquires a timing signal of the utility power through the utility power detection circuit, and if the timing signal is normal, the temperature detection step is performed; if the judging module does not acquire the timing signal, the power-on coil is kept forbidden to be connected with the load power supply, and a product code is not sent to the water heater control chip U3;
a temperature detection step: the leakage protection control chip U2 detects a temperature value between the pin and the socket through a thermistor arranged in the leakage protector, and compares the temperature value with a preset temperature value, in this embodiment, the preset temperature value is 180 degrees centigrade, and if the temperature value between the pin and the socket is lower than 180 degrees centigrade, the mains voltage detection step is performed; if the temperature value between the plug pin and the socket exceeds 180 ℃, keeping forbidding the power-on coil to be connected with a load power supply, and not sending a product code to the water heater control chip U3;
and mains voltage detection: as shown in fig. 4, the leakage protection control chip U2 collects the voltage value of the utility power through the utility power detection circuit, and determines whether the voltage value of the utility power is within a preset range, in this embodiment, the preset range is 220V ± 30%, if the voltage of the utility power is within the interval of 154V-286V, the tripping coil detection step is performed; if the mains voltage is lower than 154V or higher than 286V, the power-on coil is kept prohibited from being connected with the load power supply, and a product code is not sent to the water heater control chip U3;
a trip coil detection step: as shown in fig. 4, the resistor R2, the resistor R9, the resistor R23, and the capacitor C11 constitute a trip coil detection circuit, the leakage protection control chip U2 determines whether the trip coil is normal or not according to the voltage value output by the trip coil detection circuit, and if the voltage value output by the trip coil detection module is lower than a preset value, the power-on coil is kept prohibited from being connected to the load power supply, and no product code is sent to the hot water heater control chip U3; if not, entering a power-on coil detection step;
and a power-on coil detection step: as shown in fig. 4, the resistor R1, the resistor R10, the resistor R22, and the capacitor C10 constitute a power-on coil detection circuit, the leakage protection control chip U2 determines whether the power-on coil is normal or not according to a voltage value output by the power-on coil detection circuit, and if the voltage value output by the power-on coil detection module is lower than a preset value, the power-on coil is kept prohibited from being connected to a load power supply, and a product code is not sent to the water heater control chip U3; if not, entering a transformer detection step;
and finally, executing a mutual inductor detection step: as shown in fig. 6, the zero sequence transformer detection circuit is composed of a resistor R47, a transistor Q7, a transistor Q5, a diode D14, and the like;
firstly, a zero sequence transformer detection circuit simulates leakage of a zero line and a live line;
then the leakage protection control chip U2 detects whether the single chip microcomputer U1 sends out a leakage signal, and if the single chip microcomputer U1 does not send out a power-off signal; then the power-up coil is maintained disabled from powering on the load and no product code is issued to the water heater control chip U3;
the ground wire transformer detection circuit comprises a resistor R54, a triode Q6, a triode Q4, a diode D15 and the like;
then, simulating the earth wire to generate electric leakage by an earth wire mutual inductor detection module;
finally, the leakage protection control chip U2 detects whether the single chip microcomputer U1 sends out a leakage signal or not, and if the single chip microcomputer U1 does not send out a power-off signal; then the power-up coil is maintained disabled from powering on the load and no product code is issued to the water heater control chip U3; if the singlechip U1 sends a power-off signal, the self-test is finished, and after the self-test is finished, a product code is sent to the water heater control chip U3.
The product code is sent only after the leakage protector is normally self-checked, so that the product code cannot be sent when the leakage protector is abnormal, and the water heater cannot send a power-on permission signal to an abnormal water heater, and the use safety is further improved.
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 (9)
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 load control module can send out a power-on permission 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:
firstly, the leakage protector forbids to switch on the power supply of the load;
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: if the identification signal is consistent with the pre-stored information, the load control module sends a power-on permission signal to the leakage protector;
and finally, after the leakage protector receives the power-on permission signal, the power supply forbidding to switch on the load is released.
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 said leakage protection control module inhibits said action module from turning on power to the load until said leakage protection control module receives a power-up permission signal.
4. 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.
5. 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.
6. A method as claimed in claim 5, wherein said port module comprises a signal isolation module for electrically isolating the input and output of the signal.
7. A safe earth leakage protection method as claimed in claim 1, wherein said load control module is a water heater controller.
8. A method of providing earth leakage protection as claimed in claim 1, wherein said method further comprises the steps of:
the leakage protector carries out self-checking and sends out an identification signal when the self-checking result is normal.
9. 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 |
|---|---|---|---|
| CN201811079006.7A CN109167335B (en) | 2018-09-17 | 2018-09-17 | Safe leakage protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811079006.7A CN109167335B (en) | 2018-09-17 | 2018-09-17 | Safe leakage protection method |
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| CN109167335A CN109167335A (en) | 2019-01-08 |
| CN109167335B true CN109167335B (en) | 2020-04-28 |
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| CN111555241B (en) * | 2020-04-14 | 2024-02-20 | 中山市日丰智能电气有限公司 | Control circuit of leakage protection switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TW200635164A (en) * | 2004-09-10 | 2006-10-01 | Cooper Technologies Co | 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 |
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