CN107152788B - Electric water heater control system and electric water heater - Google Patents
Electric water heater control system and electric water heater Download PDFInfo
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- CN107152788B CN107152788B CN201710595588.3A CN201710595588A CN107152788B CN 107152788 B CN107152788 B CN 107152788B CN 201710595588 A CN201710595588 A CN 201710595588A CN 107152788 B CN107152788 B CN 107152788B
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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
- F24H9/2021—Storage heaters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention provides an electric water heater control system and an electric water heater, and relates to the technical field of water heaters. The control system of the electric water heater comprises a power supply module, an electric leakage protection plug, a single chip microcomputer, a first temperature sensor and a second temperature sensor, wherein the power supply module, the electric leakage protection plug, the first temperature sensor and the second temperature sensor are electrically connected with the single chip microcomputer; the first temperature sensor is used for detecting the temperature of an inner container of the electric water heater, the second temperature sensor is used for detecting the temperature of water outlet of the electric water heater, and the single chip microcomputer controls the disconnection or the connection of the leakage protection plug according to the temperature of the inner container and the temperature of the water outlet. The electric water heater control system controls three poles of the leakage protection plug to be automatically switched off and switched on by detecting the temperature, realizes the functions of water outlet power off, water cut-off and power on of the electric water heater, and can make a judgment timely and accurately particularly when a water flow sensor of the electric water heater fails, thereby further ensuring the use safety of the electric water heater.
Description
Technical Field
The invention relates to the technical field of water heaters, in particular to an electric water heater control system and an electric water heater.
Background
With the continuous development and progress of the society, in order to meet the requirements of users, the technology of water heaters is continuously developed and advanced, and at the present stage, the electric water heater has gone into every family, so that great convenience is brought to the water consumption of the users. However, while the electric water heater brings convenience to users, potential safety hazards inevitably exist, which threatens the life and property safety of users, and many casualty accidents caused by using the electric water heater occur every year in China, so how to ensure the electricity safety of users in the process of using the electric water heater and reduce the accidents are always the key points of attention of technical personnel in the field.
The existing electric water heater detects a water flow signal through a water flow sensor Hall element, and drives a release of an intelligent leakage protection plug to release through logic control after a user water using behavior is detected so as to control the electric water heater to cut off power when water is supplied, thereby ensuring the use safety of the electric water heater of the user. When the user stops using water or the water flow signal disappears for a period of time, the control system sends a closing instruction again to control the intelligent leakage protection plug to reset, and three poles are automatically closed to control the electric water heater to be powered on to work when water is cut off. However, in the existing solution, if the water flow sensor fails, the water flow signal cannot be detected, the intelligent leakage protection plug cannot trip when the electric water heater is powered on, and a user still uses water in the working state of the electric water heater, so that certain risks exist.
Disclosure of Invention
The invention aims to provide a control system of an electric water heater, which aims to solve the problem that when a water flow sensor fails, a user still uses the electric water heater in a power-on state and cannot ensure bathing safety of the user.
The invention aims to provide an electric water heater to solve the problem that when a water flow sensor fails, a user still uses the electric water heater in a power-on state and cannot ensure bathing safety of the user.
In order to achieve the above object, the embodiments of the present invention adopt the following technical solutions:
in a first aspect, an embodiment of the present invention provides an electric water heater control system, which is applied to an electric water heater, and includes a power module, an earth leakage protection plug, a single chip microcomputer, a first temperature sensor, and a second temperature sensor, where the power module, the earth leakage protection plug, the first temperature sensor, and the second temperature sensor are all electrically connected to the single chip microcomputer, the power module is also electrically connected to the earth leakage protection plug, the first temperature sensor is disposed in an inner container of the electric water heater, and the second temperature sensor is disposed in a water outlet pipeline of the electric water heater; the power supply module is used for charging when the leakage protection plug is closed and discharging when the leakage protection plug is disconnected; the first temperature sensor is used for detecting the temperature of an inner container of the electric water heater, and the second temperature sensor is used for detecting the water outlet temperature of the electric water heater; the single chip microcomputer is used for reading the temperature of the inner container and the temperature of the outlet water and controlling the disconnection or the connection of the leakage protection plug according to the temperature of the inner container and the temperature of the outlet water.
In a second aspect, an embodiment of the present invention further provides an electric water heater, where the electric water heater includes an electric water heater control system, the electric water heater control system includes a power module, an earth leakage protection plug, a single chip microcomputer, a first temperature sensor, and a second temperature sensor, the power module, the earth leakage protection plug, the first temperature sensor, and the second temperature sensor are all electrically connected to the single chip microcomputer, the power module is also electrically connected to the earth leakage protection plug, the first temperature sensor is disposed in an inner container of the electric water heater, and the second temperature sensor is disposed in a water outlet pipeline of the electric water heater; the power supply module is used for charging when the leakage protection plug is closed and discharging when the leakage protection plug is disconnected; the first temperature sensor is used for detecting the temperature of an inner container of the electric water heater, and the second temperature sensor is used for detecting the water outlet temperature of the electric water heater; the single chip microcomputer is used for reading the temperature of the inner container and the temperature of the outlet water and controlling the disconnection or the connection of the leakage protection plug according to the temperature of the inner container and the temperature of the outlet water.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an electric water heater control system which comprises a power supply module, an electric leakage protection plug, a single chip microcomputer, a first temperature sensor and a second temperature sensor, wherein the power supply module, the electric leakage protection plug, the first temperature sensor and the second temperature sensor are all electrically connected with the single chip microcomputer; the power supply module is used for charging when the leakage protection plug is closed and discharging when the leakage protection plug is disconnected; the first temperature sensor is used for detecting the temperature of an inner container of the electric water heater, and the second temperature sensor is used for detecting the water outlet temperature of the electric water heater; the single chip microcomputer is used for reading the temperature of the inner container and the temperature of the outlet water and controlling the disconnection or the connection of the leakage protection plug according to the temperature of the inner container and the temperature of the outlet water. The electric water heater control system realizes that the electric water heater is powered off when water is discharged by controlling three poles of the leakage protection plug to be automatically switched on and off, and a user stops powering on the electric water heater, so that the safe bathing of the user is ensured. In addition, the on-off of the electric water heater is realized through a temperature detection mode, under the condition that the water flow sensor breaks down, the judgment can be still accurately made in time, three poles of the leakage protection plug are cut off, and the use safety of the electric water heater is further guaranteed.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a functional block diagram of a control system of an electric water heater according to a first embodiment of the present invention.
Fig. 2 shows a functional block diagram of a control system of an electric water heater according to a second embodiment of the present invention.
Fig. 3 shows a functional block diagram of a control system of an electric water heater according to a third embodiment of the present invention.
Fig. 4 shows a schematic structural diagram of an electric water heater provided by a fourth embodiment of the invention.
Icon: 100-electric water heater control system; 200-an electric water heater; 110-a power supply module; 120-earth leakage protection plug; 130-a single chip microcomputer; 140-a first temperature sensor; 150-a second temperature sensor; 160-isolated communication module; 170-a relay module; 180-water flow sensor; 190-a power supply detection module; 101-a display screen; 171-a first relay; 172-a second relay; 210-an electric heater; 220-inner container; 230-water outlet line; 240-water inlet pipeline.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
First embodiment
Referring to fig. 1, a functional block diagram of an electric water heater control system 100 according to a first embodiment of the present invention is shown. The electric water heater control system 100 can be applied to an electric water heater, and is particularly used for controlling the power-on and power-off of the electric water heater, so that a user can control the power-off of the electric water heater when the user uses water, and control the power-on work of the electric water heater when the user stops using water, and the bathing safety of the user is ensured.
In this embodiment, the electric water heater control system 100 includes a power module 110, an earth leakage protection plug 120, a single chip microcomputer 130, a first temperature sensor 140, and a second temperature sensor 150, where the power module 110, the earth leakage protection plug 120, the first temperature sensor 140, and the second temperature sensor 150 are all electrically connected to the single chip microcomputer 130, and the power module 110 is further electrically connected to the earth leakage protection plug 120. Preferably, the first temperature sensor 140 is disposed in the inner container of the electric water heater, and the second temperature sensor 150 is disposed in the water outlet pipeline of the electric water heater.
The power module 110 is configured to charge and supply power to the single chip microcomputer 130 when the earth leakage protection plug 120 is closed, and the power module 110 is further configured to discharge and supply power to the single chip microcomputer 130 when the earth leakage protection plug 120 is disconnected. Preferably, the power module 110 is a rechargeable battery or a faraday capacitor, when the leakage protection plug 120 is closed, the electric water heater is powered on by the leakage protection plug 120 and the power module 110 charges the single chip microcomputer 130 while supplying power, and when the leakage protection plug 120 is disconnected, the electric water heater is disconnected from the external power supply, and at this time, the power module 110 starts to discharge and supplies power to the single chip microcomputer 130 through a discharge voltage, so that the single chip microcomputer 130 enters a low-power-consumption working state. Preferably, the power module 110 can be connected to the power line of the earth leakage protection plug 120 through a cable.
The first temperature sensor 140 is used for detecting the temperature of the inner container of the electric water heater, the second temperature sensor 150 is used for detecting the temperature of the outlet water of the electric water heater, and the single chip microcomputer 130 is used for reading the temperature of the inner container and the temperature of the outlet water and controlling the leakage protection plug 120 to be opened or closed according to the temperature of the inner container and the temperature of the outlet water.
Specifically, when the liner temperature and the outlet water temperature satisfy a first preset condition, the single chip microcomputer 130 sends a power-off instruction to the leakage protection plug 120 to disconnect the leakage protection plug 120. When the inner container temperature and the outlet water temperature meet a second preset condition, the single chip microcomputer 130 sends a power-on instruction to the leakage protection plug 120 to close the leakage protection plug 120.
As an embodiment, the single chip 130 compares the temperature T of the inner container Inner part And the temperature T of the outlet water Go out According to the comparison result, a power-off command is sent to the earth leakage protection plug 120 to disconnect the earth leakage protection plug 120. For example, when the temperature T of the liner is higher Inner part And the temperature T of the outlet water Go out Satisfies the following formula: t is Go out ≥T Inner part If the single chip microcomputer 130 sends a power-off instruction to disconnect the earth leakage protection plug 120, when the single chip microcomputer 130 sends a power-off instruction to disconnect the earth leakage protection plug 120, the single chip microcomputer 130 maintains a low-power-consumption working state through the discharge voltage of the power module 110, and when the single chip microcomputer 130 judges the temperature T of the inner container Inner part With the temperature T of the effluent Go out Satisfies the following conditions: t is Go out ＜T Inner part And T Go out When the temperature drops to room temperature, the single chip microcomputer 130 sends a closing instruction to close the leakage protection plug 120, and the electric water heater is electrified with an external power supply to start working.
Further, the electric water heater control system 100 may further include an isolation communication module 160, and the isolation communication module 160 is electrically connected to both the earth leakage protection plug 120 and the single chip microcomputer 130. The single chip microcomputer 130 and the earth leakage protection plug 120 realize isolation and communication of strong and weak current through an isolation communication module 160. In this embodiment, the isolation communication module 160 may be integrated into a circuit formed by the single chip 130, or integrated into the plug of the earth leakage protection plug 120, or installed on the body of the electric water heater as an independent module. Preferably, the isolation communication module 160 is a photocoupler or other module with similar functions, which can realize strong and weak electrical isolation and communication. Specifically, the single chip microcomputer 130 may send a power-off command or a power-on command to the earth leakage protection plug 120 through the isolation communication module 160 to achieve opening and closing of the earth leakage protection plug 120.
Further, the electric water heater control system 100 may further include a relay module 170, and the electric water heater includes an electric heater 210, and the electric heater 210 is configured to heat the water stored in the inner container of the electric water heater when the electric heater is powered on. The relay module 170 may specifically include a first relay 171 and a second relay 172, one end of the electric heater 210 is electrically connected to the live wire of the earth leakage protection plug 120 through the first relay 171, and the other end of the electric heater 210 is electrically connected to the neutral wire of the earth leakage protection plug 120 through the second relay 172. When the earth leakage protection plug 120 is closed, the electric heater 210 starts to heat; when the earth leakage protection plug 120 is disconnected, the electric heater 210 is disconnected from the external power supply, and heating is stopped, so that the electric water heater is powered off when a user uses water, and is powered on when the user stops using water, and bathing safety of the user is guaranteed.
It should be noted that, in this embodiment, in order to enhance the accuracy of the temperature determination, an improved embodiment may be provided, and the electric water heater control system 100 may further include a third sensor and a fourth sensor (not shown in the figure), where the third sensor is used to detect the external environment temperature, the fourth sensor is used to detect the temperature of the top of the inner container of the electric water heater, and the single chip microcomputer 130 compares the inner container temperature T with the inner container temperature T Inner part Water outlet temperature T Go out The temperature T of the external environment Ring (C) And the temperature T of the top of the inner container Top roof The earth leakage protection plug 120 is controlled to be opened or closed. For example, when T Go out ≥T Top roof -2 and T Go out ＞T Inner part ＞T Ring (C) When +2, and stabilize one second, the one-chip computer 130 controls the leakage protection plug 120 to be disconnected; when T is Go out ＜T Top roof -2 or T Go out ≤T Inner part Or T Go out ≤T Ring (C) And when the temperature is less than or equal to 40 ℃ and lasts for a certain time, the singlechip 130 controls the leakage protection plug 120 to be closed.
It should also be noted that the temperature T of the inner container is described above Inner part And the temperature T of the outlet water Go out Or temperature T of the liner Inner part Water outlet temperature T Go out The temperature T of the external environment Ring (C) And the temperature T of the top of the inner container Top roof The satisfaction of the determination condition is only an example, and may be adjusted according to actual needs, and is not limited thereto.
Second embodiment
Referring to fig. 2, a functional block diagram of an electric water heater control system 100 according to a second embodiment of the present invention is shown. The second embodiment provides the electric water heater control system 100 different from the first embodiment in that: the electric water heater control system 100 further includes a water flow sensor 180, the water flow sensor 180 is electrically connected to the single chip microcomputer 130, and the water flow sensor 180 is preferably disposed in a water inlet pipeline or a water outlet pipeline of the electric water heater, and is configured to detect whether a water flow signal exists or not to obtain a detection result. The single chip microcomputer 130 is configured to control the leakage protection plug 120 to be turned off when the water flow sensor 180 detects the water flow signal, and the single chip microcomputer 130 is further configured to control the leakage protection plug 120 to be turned on when the water flow sensor 180 does not detect the water flow signal, so as to intelligently control the electric water heater to be powered on and off.
In this embodiment, the water flow sensor 180 mainly includes a valve body, a water flow rotor assembly and a hall element, when a user opens the water valve, water flows through the water flow sensor 180 to drive the magnetic rotor to rotate, the hall element outputs an electrical signal, and the single chip microcomputer 130 controls the earth leakage protection plug 120 to be disconnected after detecting that the electrical signal is received.
It can be understood that, in the practical use of the electric water heater control system 100 provided in this embodiment, the single chip microcomputer 130 can implement the functions of water-out power-off and water-off power-on of the electric water heater through the detected water flow signal, liner temperature and water-out temperature, that is, the electric water heater can be powered on and off in time through the dual signal.
Specifically, when the water flow sensor 180 detects that at least one of the water flow signal and the liner temperature and the effluent temperature read by the single chip microcomputer 130 meets the first preset condition, the single chip microcomputer 130 sends a power-off instruction to the earth leakage protection plug 120 through the isolation communication module 160 to disconnect the earth leakage protection plug 120. That is to say, even if the water flow sensor 180 fails and cannot detect a water flow signal, the single chip microcomputer 130 controls the leakage protection plug 120 to be disconnected when the inner container temperature and the water outlet temperature meet the first preset condition, so as to prevent a user from using water in the working state of the electric water heater. Meanwhile, the single chip microcomputer 130 will record that no water flow signal is detected when the power is off last time, and the water flow sensor 180 may be out of order.
Similarly, when the water flow sensor 180 does not detect a water flow signal or the liner temperature and the outlet water temperature meet a second preset condition, the single chip microcomputer 130 sends a power-on instruction to the leakage protection plug 120 to close the leakage protection plug 120. It should be understood that, at this time, if the water flow sensor 180 has failed, the single chip microcomputer 130 determines according to the liner temperature and the outlet water temperature.
Third embodiment
Referring to fig. 3, a functional block diagram of an electric water heater control system 100 according to a third embodiment of the present invention is shown. The third embodiment provides the electric water heater control system 100 different from the second embodiment in that: the electric water heater control system 100 further comprises a power supply detection module 190, wherein the power supply detection module 190 is electrically connected with the power supply module 110 and the single chip microcomputer 130; the single chip microcomputer 130 is further configured to detect that the earth leakage protection plug 120 is opened or closed through the power detection module 190. For example, after the single chip microcomputer 130 sends a power-off command or a power-on command through the isolation communication module 160, it cannot be guaranteed that the earth leakage protection plug 120 is actually opened or closed at this time. Therefore, the single chip microcomputer 130 needs to detect the power supply state of the power module 110 through the power detection module 190, and can determine that the earth leakage protection plug 120 is open if the power module 110 is in the discharge state, and can determine that the earth leakage protection plug 120 is closed if the power module 110 is in the charge state. If the singlechip 130 does not detect the disconnection of the earth leakage protection plug 120 within a period of time after sending the power-off instruction, the singlechip 130 sends the power-off instruction again until detecting the disconnection of the earth leakage protection plug 120; similarly, if the single chip microcomputer 130 does not detect that the leakage protection plug 120 is closed within a period of time after sending the power-on command, the power-on command is sent again until the leakage protection plug 120 is detected to be closed. Preferably, when the power-off command or the power-on command is sent for a predetermined number of times and the earth leakage protection plug 120 cannot be correspondingly detected to be disconnected or closed, the single chip microcomputer 130 may give a fault alarm to prompt the user that the electric water heater fails.
Further, the electric water heater control system 100 may further include a display screen 101, and the display screen 101 is electrically connected to the single chip microcomputer 130. The display screen 101 may be used to display the above-mentioned fault alarm to remind the user that the electric water heater needs to be overhauled. In addition, when the single chip microcomputer 130 records that no water flow signal is detected when the last power failure occurs, the display screen 101 is controlled to display that the water flow sensor 180 may break down to prompt a user to replace the water flow sensor in time.
Fourth embodiment
Fig. 4 is a schematic structural diagram of an electric water heater 200 according to a fourth embodiment of the present invention. The electric water heater 200 includes an electric heater 210, an inner container 220, a water outlet pipe 230, a water inlet pipe 240, and the electric water heater control system 100 provided in the third embodiment, wherein the electric water heater control system 100 is electrically connected to the electric heater 210, and the specific contents of the electric water heater control system 100 can refer to the description of the third embodiment. The first temperature sensor 140 of the electric water heater control system 100 is installed in the inner container 220, the second temperature sensor 150 is installed in the water outlet pipe 230, and the water flow sensor 180 is installed in the water outlet pipe 230 or the water inlet pipe 240. When the electric water heater 200 is powered on (i.e., water flows through the water outlet line 230 and the water inlet line 240), the single chip 130 in the electric water heater control system 100 can control the earth leakage protection plug 120 to open to power off the electric water heater 200, and stop working, and when the electric water heater 200 is powered off (i.e., no water flows through the water outlet line 230 and the water inlet line 240), the single chip 130 in the electric water heater control system 100 can control the earth leakage protection plug 120 to close to power on the electric water heater 200.
In summary, the control system of the electric water heater provided by the embodiment of the present invention includes a power module, an earth leakage protection plug, a single chip microcomputer, a first temperature sensor and a second temperature sensor, wherein the power module, the earth leakage protection plug, the first temperature sensor and the second temperature sensor are electrically connected to the single chip microcomputer, the power module is further electrically connected to the earth leakage protection plug, the first temperature sensor is disposed in an inner container of the electric water heater, and the second temperature sensor is disposed in a water outlet pipeline of the electric water heater; the power supply module is used for charging when the leakage protection plug is closed and discharging when the leakage protection plug is disconnected; the first temperature sensor is used for detecting the temperature of an inner container of the electric water heater, and the second temperature sensor is used for detecting the water outlet temperature of the electric water heater; the single chip microcomputer is used for reading the temperature of the inner container and the temperature of the outlet water and controlling the disconnection or the connection of the leakage protection plug according to the temperature of the inner container and the temperature of the outlet water. The electric water heater control system realizes that the electric water heater is powered off when water is discharged by controlling three poles of the leakage protection plug to be automatically switched on and off, and a user stops powering on the electric water heater, so that the safe bathing of the user is ensured. In addition, the on-off of the electric water heater is realized in a temperature detection mode, under the condition that the water flow sensor fails, the judgment can be still made accurately in time, three poles of the leakage protection plug are cut off, and a user is informed that the water flow sensor fails.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Claims (10)
1. A control system of an electric water heater is applied to the electric water heater and is characterized by comprising a power supply module, an electric leakage protection plug, a single chip microcomputer, a first temperature sensor, a second temperature sensor, a third sensor and a fourth sensor, wherein the power supply module, the electric leakage protection plug, the first temperature sensor and the second temperature sensor are electrically connected with the single chip microcomputer;
the power supply module is used for charging when the leakage protection plug is closed and discharging when the leakage protection plug is disconnected;
the first temperature sensor is used for detecting the temperature of an inner container of the electric water heater, and the second temperature sensor is used for detecting the water outlet temperature of the electric water heater;
the third sensor is used for detecting the temperature of the external environment, and the fourth sensor is used for detecting the temperature of the top of the liner of the electric water heater;
the single chip microcomputer is used for reading the temperature of the inner container, the temperature of the outlet water, the temperature of the external environment and the temperature of the top of the inner container, and controlling the leakage protection plug to be disconnected under the condition that the temperature of the outlet water is greater than or equal to the temperature of the top of the inner container minus 2 ℃ within one second, the temperature of the outlet water is greater than the temperature of the inner container plus 2 ℃, and the temperature of the inner container is greater than the temperature of the external environment plus 2 ℃; the single chip microcomputer is further used for controlling the leakage protection plug to be closed when the water outlet temperature is less than the temperature of the top of the inner container minus 2 ℃ or less than or equal to the temperature of the inner container or less than or equal to the external environment temperature and less than or equal to 40 ℃ within a certain duration.
2. The electric water heater control system of claim 1, wherein the single chip microcomputer is configured to send a power-off command to the earth leakage protection plug to disconnect the earth leakage protection plug when the temperature of the inner container and the temperature of the outlet water satisfy a first preset condition.
3. The electric water heater control system of claim 1, wherein the single chip is configured to send a power-on command to the leakage protection plug to close the leakage protection plug when the temperature of the inner container and the temperature of the outlet water satisfy a second preset condition.
4. The electric water heater control system according to claim 1, further comprising a water flow sensor electrically connected to the single chip, wherein the water flow sensor is disposed in the water inlet pipeline or the water outlet pipeline of the electric water heater and configured to detect whether there is a water flow signal, the single chip is configured to control the earth leakage protection plug to be opened when the water flow sensor detects the water flow signal, and the single chip is further configured to control the earth leakage protection plug to be closed when the water flow sensor does not detect the water flow signal.
5. The electric water heater control system of claim 1, further comprising an isolation communication module electrically connected to both the earth leakage protection plug and the single-chip microcomputer.
6. The electric water heater control system of claim 1, further comprising a power detection module electrically connected to both the power module and the single-chip microcomputer; the single chip microcomputer is also used for detecting the disconnection or the connection of the leakage protection plug through the power supply detection module.
7. The electric water heater control system of claim 1, wherein the power module is a battery or a farad capacitor.
8. The electric water heater control system of claim 1, further comprising a display screen electrically connected to the single-chip microcomputer.
9. The electric water heater control system according to claim 1, wherein the electric water heater comprises an electric heater, the electric water heater control system further comprises a first relay and a second relay, one end of the electric heater is electrically connected to the live wire of the earth leakage protection plug through the first relay, and the other end of the electric heater is electrically connected to the neutral wire of the earth leakage protection plug through the second relay.
10. An electric water heater comprising an electric water heater control system according to any one of claims 1-9.
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| CN201710595588.3A CN107152788B (en) | 2017-07-20 | 2017-07-20 | Electric water heater control system and electric water heater |
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| CN201710595588.3A CN107152788B (en) | 2017-07-20 | 2017-07-20 | Electric water heater control system and electric water heater |
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|---|---|---|---|---|
| CN107606800A (en) * | 2017-10-10 | 2018-01-19 | 广东万家乐燃气具有限公司 | A kind of control system of electric water heater with temperature sensor fault detection |
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| CN107152788A (en) | 2017-09-12 |
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