CN109268911B - Water shortage detection circuit and household appliance - Google Patents
Water shortage detection circuit and household appliance Download PDFInfo
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- CN109268911B CN109268911B CN201811129256.7A CN201811129256A CN109268911B CN 109268911 B CN109268911 B CN 109268911B CN 201811129256 A CN201811129256 A CN 201811129256A CN 109268911 B CN109268911 B CN 109268911B
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- water shortage
- container
- detection circuit
- shortage detection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D13/00—Electric heating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1096—Arrangement or mounting of control or safety devices for electric heating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/08—Electric heater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/20—Heat consumers
- F24D2220/2009—Radiators
- F24D2220/2036—Electric radiators
Abstract
The invention discloses a water shortage detection circuit and a household appliance, wherein the water shortage detection circuit comprises: the heating module is used for heating liquid in the container to evaporate the liquid; the temperature control module is arranged on the outer wall of the container and connected with the heating module in series to form a series circuit, and the series circuit is used for disconnecting when the surface temperature of the container exceeds a first preset temperature due to the fact that the liquid in the container is lower than a preset value. The water shortage detection circuit can realize water shortage detection by utilizing the heating module and the temperature control module arranged on the outer wall of the container; the temperature control module is conducted to indicate that the container is not lack of water; the temperature control module is disconnected, and the water shortage of the container is indicated; and the water shortage detection is realized through the state of the temperature control module. The water shortage detection circuit is simple in structure and convenient to run, produce and install, and the defects that in the prior art, a water shortage detection device formed by a liquid level switch or a reed switch and the like is complex in running, production and assembly are overcome.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a water shortage detection circuit and a household appliance.
Background
The electric heater is a common household appliance, and is widely applied to daily life of people. Along with the use of electric heater, the humidity of environment can reduce gradually, for satisfying user's demand better and improving quality of life, the electric heater that has the humidification function gradually becomes mainstream product.
The electric heater with humidification function need set up lack of water detection device, and lack of water detection device stops the humidification function when detecting lack of water, prevents that the electric heater still is in the humidification state under the state of lack of water and leads to the electric heater to damage or danger such as explosion. At present, the water shortage detection is basically realized by a liquid level switch or a reed switch, and high or low level is input to a chip by switching on and off the liquid level switch or the reed switch, so that whether water shortage exists or not is judged.
The liquid level switch or the reed switch is used, a wire needs to be led out again, and the liquid level switch or the reed switch needs to be stretched into the water tank, so that wiring, production and assembly are complex.
Disclosure of Invention
In view of this, the embodiment of the invention provides a water shortage detection circuit and a household appliance, so as to solve the problem that the wiring and production assembly of a water shortage detection device in the prior art are complex.
The embodiment of the invention provides a water shortage detection circuit, which comprises: the heating module is used for heating liquid in the container to evaporate the liquid; the temperature control module is arranged on the outer wall of the container, is connected with the heating module in series to form a series circuit, and is used for disconnecting when the surface temperature of the container exceeds a first preset temperature due to the fact that the liquid in the container is lower than a preset value. The water shortage detection circuit can realize water shortage detection by utilizing the heating module and the temperature control module arranged on the outer wall of the container; the temperature control module is conducted to indicate that the container is not lack of water; the temperature control module is disconnected, and the water shortage of the container is indicated; and the water shortage detection is realized through the state of the temperature control module. The water shortage detection circuit is simple in structure and convenient to run, produce and install, and the defects that in the prior art, a water shortage detection device formed by a liquid level switch or a reed switch and the like is complex in running, production and assembly are overcome.
Optionally, the heat generating module and the temperature control module are not in contact. The heating module and the temperature control module are separated by a certain distance, so that the installation space can be saved, and the misoperation of the temperature control module caused by the heat generated by the heating module can be prevented.
Optionally, the method further comprises: a detection module, one end of which is connected with one end of the series circuit; the detection module is used for detecting the connection or disconnection of the temperature control module. The detection module converts the on-off state of the temperature control module into an electric signal, so that the indication of the water shortage state is more visual.
Optionally, the detection module includes: the circuit comprises a first branch circuit, a second branch circuit, an optocoupler device and an energy storage capacitor; wherein a first end of the first branch is connected to a second end of the second branch and further connected to the one end of the series circuit; the second end of the first branch is connected with the first end of the second branch; the first branch circuit and the second branch circuit are used for controlling the on or off of the optical coupler; a first input end of the optical coupler device is connected with a second end of the second branch circuit, a second input end of the optical coupler device is connected with a first end of the second branch circuit, a first output end of the optical coupler device is connected with a first power supply, and a second output end of the optical coupler device is connected with one end of the energy storage capacitor; and the other end of the energy storage capacitor is connected with a second power supply.
Optionally, the energy storage capacitor is an electrolytic capacitor, and a capacitance value of the electrolytic capacitor is not less than 4.7 uF.
Optionally, the first branch comprises a first diode; the second branch comprises a second diode group comprising at least two second diodes connected in series.
Optionally, the method further comprises: and the filter capacitor is connected with the first branch in parallel. The filter capacitor is used for filtering interference, prevents the optical coupler from being conducted by mistake, and improves the anti-interference performance of the water shortage detection circuit.
Optionally, the method further comprises: the first current limiting resistor is connected with the first input end of the optocoupler in series; and/or, connected in series with a second input of the optocoupler device. When the optical coupler is switched on, the optical coupler is prevented from generating higher pulse current, and the optical coupler device is protected.
Optionally, the method further comprises: the second current limiting resistor is connected with the first output end of the optocoupler in series; and/or, the second output end of the optical coupler device is connected in series. When the energy storage capacitor is not charged, higher pulse current exists at the moment of conduction, and the second current limiting resistor is used for limiting current to protect the optical coupler; and meanwhile, when the optical coupler is cut off, a discharging loop is provided for the energy storage capacitor.
Optionally, the temperature control module comprises an automatic reset thermostat. When the temperature is lower than the recovery temperature, the automatic reset temperature controller automatically resets, the water shortage detection circuit automatically starts working, the intervention of an operator is not needed, the automatic reset temperature controller is more intelligent and automatic, and the production cost is lower.
Optionally, the method further comprises: and the controller is connected with the output end of the detection module and used for sending alarm information when the detection module detects that the temperature control module is disconnected. The detection module detects that the temperature control module is disconnected to indicate that the container is in a water shortage state, and the alarm information is used for prompting a user to replenish liquid in the container in time.
Optionally, the method further comprises: and the switch is connected with the series circuit in series and is used for controlling the humidifying state of the container. The humidifying control is more flexible by adding the switch, and a user can control the working state of the humidifying device according to the requirement.
Optionally, the method further comprises: the temperature detection module is arranged on the outer wall of the container, is connected with the switch, is also connected with the controller and is used for detecting the temperature of the container; the switch is further connected with the controller, and the controller is further used for controlling the switch to be disconnected when the temperature of the container is higher than a second preset temperature. Therefore, the temperature control module can be effectively prevented from being effectively disconnected in the water shortage state, the heating module is caused to continue heating to cause damage to components, and the dual protection of the water shortage circuit is realized.
The embodiment of the invention also provides a household appliance which comprises the water shortage detection circuit. Because the water shortage detection circuit with simple circuit structure and convenient wiring, production and installation is adopted, the household appliance also has the advantages of simple structure and convenient wiring, production and installation, and the defects that the water shortage detection device formed by a liquid level switch or a reed switch and the like in the prior art is complicated in wiring and production and assembly are overcome.
Optionally, the household appliance further comprises a humidifying device, and the water shortage detection circuit is used for detecting whether a container in the humidifying device is in water shortage.
Optionally, the household appliance comprises an electric heater.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a specific example of a water shortage detection circuit in an embodiment of the present invention;
FIG. 2 is a schematic diagram of another specific example of a water shortage detection circuit in an embodiment of the present invention;
FIG. 3 is a schematic diagram of another specific example of a water shortage detection circuit in an embodiment of the present invention;
fig. 4 is a schematic diagram of a specific example of a specific operation process of the water shortage detection circuit in the embodiment of the present invention.
Reference numerals:
1. a heat generating module; 2. a temperature control module; 3. a detection module; 31. a first branch; 32. a second branch circuit; 33. an optocoupler device; 34. an energy storage capacitor; 35. a filter capacitor; 36. a first current limiting resistor; 37. a second current limiting resistor; 38. a discharge resistor; 39. a third current limiting resistor; 4. a controller; 5. and (4) switching.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. It should also be noted that the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment provides a water shortage detection circuit, whether be applied to in the water storage container of domestic appliance (if the electric heater that has the humidification function) with the detection container lack water, this water shortage detection circuit's circuit structure is simple, has solved among the prior art and has adopted water shortage detection device that liquid level switch or tongue tube etc. constitute to walk the line and produce the complicated defect of assembly. As shown in fig. 1, the water shortage detection circuit includes: a heating module 1 and a temperature control module 2. A heat generating module 1 for heating liquid in the container to evaporate the liquid; the temperature control module 2 is arranged on the outer wall of the container and connected with the heating module 1 in series to form a series circuit, and is used for disconnecting when the surface temperature of the container exceeds a first preset temperature due to the fact that the liquid in the container is lower than a preset value.
In an optional embodiment, specifically, the heating module is connected in series with the temperature control module, and then connected to an ac power supply after being connected in series, the heating module is connected to an active line (ACL) of the ac power supply, the temperature control module is connected to a zero line (ACN) of the ac power supply, and generally, the household appliances are all supplied with ac power; certainly, in other embodiments, the series circuit may also be connected to a DC power supply, and may be shared by a DC power supply output terminal on the household appliance, or an additional DC power supply or an additional AC-to-DC (AC-DC) chip may be required if there is no DC power supply, which results in higher production cost.
In an optional embodiment, the heating module 1 is arranged on the outer wall of the container, so that the installation is simple, convenient and easy to operate; of course, in other embodiments, the heat generating module may be disposed at other positions, such as inside the container, and may be disposed reasonably according to needs.
In an optional embodiment, the heating module can be heating cotton, and the heating cotton is wound on the outer wall of the container, so that the heating cotton can heat the liquid in the container more uniformly; of course, in other embodiments, the heat generating module may also adopt other heat generating devices in the prior art, such as a heating wire, and the like, and may be reasonably arranged according to needs.
In an alternative embodiment, the liquid in the container may be water; of course, in other embodiments, the liquid in the container can also be other liquids, and the liquid can be reasonably arranged according to needs.
In an optional embodiment, when the liquid in the container is lower than the preset value, it indicates that the liquid in the container is less, the household appliance is in a water-deficient state, and different household appliances correspond to different water-deficient states, so the preset value can be reasonably set as required, for example, the preset value is set to be 5% of the volume of the container, that is, when the liquid in the container is lower than 5% of the volume of the container, the container is in a water-deficient state.
In an alternative embodiment, the first predetermined temperature may be 120 degrees celsius; of course, in other embodiments, the first preset temperature may also be set to other temperature values, such as 110 degrees celsius or 130 degrees celsius, and may be set as needed.
The working principle of the water shortage detection circuit provided by the embodiment of the invention is introduced as follows: when the module that generates heat lasts to generate heat, the water in the container lasts the evaporation, when the water evaporation is less than the default, the module that generates heat still can last the heating, the produced heat of the module that generates heat then can concentrate and present on the container outer wall this moment, lead to the temperature of container to rise sharply, and temperature control module hugs closely on the container outer wall, at this moment through the heat transfer, the temperature of container will be passed to temperature control module, temperature control module disconnection after temperature control module reaches temperature protection point (first preset temperature), after the disconnection of temperature control module, the module that generates heat stops to generate heat, play the effect of power-off protection, water shortage detection has been realized.
The water shortage detection circuit can realize water shortage detection by utilizing the heating module and the temperature control module arranged on the outer wall of the container; the temperature control module is conducted to indicate that the container is not lack of water; the temperature control module is disconnected, and the water shortage of the container is indicated; and the water shortage detection is realized through the state of the temperature control module. The water shortage detection circuit is simple in structure and convenient to walk, produce and install. Specifically, when liquid in the container is lower than a preset value, heat generated by the heating module can be concentrated on the outer wall of the container, so that the surface temperature of the container detected by the temperature control module reaches a first preset temperature, the temperature control module is disconnected after the first preset temperature is reached, and the water shortage state is judged at the moment, so that the water shortage detection is realized.
In an optional embodiment, the temperature control module 2 may be an automatic reset temperature controller, the turn-off temperature of the automatic reset temperature controller may be 120 ℃, the recovery temperature may be 50-70 ℃, the automatic reset temperature controller automatically resets when the surface temperature of the container drops below the recovery temperature, the water shortage detection circuit automatically starts working, no operator intervention is needed, the operation is more intelligent and automatic, and the production cost is lower; of course, in other embodiments, the temperature control module may also adopt other devices capable of being turned off according to the temperature in the prior art, such as a power-off reset temperature controller, which is reasonably set as required.
In an alternative embodiment, the vessel may be an iron pipe; of course, in other embodiments, other containers with the function of containing liquid in the prior art can be adopted, and the containers can be arranged reasonably according to needs.
In an optional embodiment, the heating module is not in contact with the temperature control module, the heating module is separated from the temperature control module by a certain distance, the preferred range is 5mm-20mm, and the preferred value is 10mm, so that the installation space can be saved, and the misoperation of the temperature control module caused by heat generated by the heating module can be prevented; of course, in other embodiments, the distance between the heat generating module and the temperature control module may be reasonably set according to the needs, which is not limited in this embodiment.
In an alternative embodiment, as shown in fig. 2, the water shortage detection circuit further includes: one end of the detection module 3 is connected with one end of the series circuit; the detection module 3 is used for detecting the connection or disconnection of the temperature control module 2. The detection module converts the on-off state of the temperature control module into an electric signal, so that the indication of the water shortage state is more visual.
In an optional embodiment, the detection module 3 is connected in series with the series circuit, one end of the detection module is connected with the temperature control module 2, and the other end of the detection module is connected with the ACN end of the alternating current power supply, so that the wiring of the heating module and the temperature control module can be reduced, the distance between the heating module and the temperature control module is reduced, the space is saved, and the temperature control is more accurate; of course, in other embodiments, the detection module may also be disposed between the series circuits, and may be disposed reasonably as needed.
In an alternative embodiment, as shown in fig. 3, the detection module 3 comprises: a first branch 31, a second branch 32, an optical coupler 33 and an energy storage capacitor 34.
Wherein, the first end of the first branch 31 is connected with the second end of the second branch 32, and is also connected with one end of the series circuit; the second end of the first branch 31 is connected with the first end of the second branch 32, and is also connected with the ACN end of the ac power supply; the first branch 31 and the second branch 32 are used for controlling the on/off of the optical coupler;
a first input end of the optical coupler device 33 is connected with a second end of the second branch 32, a second input end of the optical coupler device 33 is connected with a first end of the second branch 32, a first output end of the optical coupler device 33 is connected with a first power supply V1, and a second output end of the optical coupler device 33 is connected with one end of the energy storage capacitor 34;
the other end of the energy storage capacitor 34 is connected to a second power supply V2.
In an alternative embodiment, the voltage value of the first power source V1 may be +5V, and the voltage value of the second power source may be 0V, so that the second output terminal of the optocoupler outputs a suitable voltage value for subsequent input into a controller (e.g., a control chip) to match the input voltage required by the controller; of course, in other embodiments, the voltage values of the first power supply and the second power supply can be set reasonably as required.
In an alternative embodiment, the first branch 31 comprises a first diode; the second branch 32 comprises a second diode group comprising at least two second diodes connected in series. As shown in fig. 3, the second diode group includes three second diodes connected in series; certainly, in other embodiments, the number of the second diodes connected in series is determined according to the type of the selected optocoupler, as long as it can be ensured that the voltage drop on the second branch circuit after the second diodes are connected in series makes the optocoupler conduct, and the specific number of the second diodes connected in series can be measured through tests. In other alternative embodiments, the second branch may also be a resistor, and the resistance of the resistor may be obtained through a test, so as to ensure that the detection module can output a high level in the whole period of the ac power supply in the water-shortage state of the container.
Specifically, the first end of the first branch may be a cathode of the first diode, and the second end may be an anode of the first diode; the first end of the second branch circuit can be a cathode of the second diode group, and the second end can be an anode of the first diode; the first input terminal of the optocoupler device may be a high potential input terminal and the second input terminal of the optocoupler device may be a low potential input terminal. Of course, in other embodiments, the first end of the first branch may also be an anode of the first diode, and the second end may be a cathode of the first diode; the first end of the second branch is also the anode of the first diode, and the second end is the cathode of the second diode group; correspondingly, a first input end of the optical coupler device is a low potential input end, and a second input end of the optical coupler device is a high potential input end; therefore, when the second branch circuit is conducted, the optical coupler device is conducted, and when the first branch circuit is conducted, the optical coupler device is not conducted.
The specific operation of the detection module is described by taking the example shown in fig. 3. When the container is not lack of water, the whole loop is conducted, the second branch is conducted in a positive half period (ACL high potential and ACN low potential) of the alternating current power supply, the optocoupler is conducted, and the second output end of the optocoupler outputs high potential; in the negative half period of the alternating current power supply (ACL low potential, ACN high potential), the first branch circuit is conducted, the optical coupler device is not conducted, the second output end of the optical coupler device still outputs high potential under the action of the energy storage capacitor, and the energy storage capacitor is charged again in the next period. When the container lacks water, the temperature control module disconnection, whole return circuit disconnection, the opto-coupler device does not switch on, and the electric charge of energy storage electric capacity storage can slowly release, and the second output of opto-coupler device can be changed into the low level by the high level, detects the container and lacks water promptly to the lack of water detection has been realized.
In an optional embodiment, the capacitor with a large capacitance value can ensure that the voltage of the second output end of the optical coupler device discharges slowly in a negative half period under the condition that the capacitor is not lack of water, so that a high level is output in the whole period of the whole alternating current power supply, the energy storage capacitor can be an electrolytic capacitor, the anode of the electrolytic capacitor is connected with the second output end of the optical coupler device, and the cathode of the electrolytic capacitor is connected with the second power supply; of course, in other embodiments, the energy storage capacitor may also be other types of capacitors, such as a tantalum capacitor with higher cost, or a ceramic capacitor, and the like, and may be reasonably set as needed.
In an alternative embodiment, the capacitance value of the energy storage capacitor may preferably be not less than 4.7uF, so as to maintain a relatively stable high level; of course, the capacitance values of the energy storage capacitors required by different optocoupler devices are different, and the specific numerical values of the energy storage capacitors can be measured according to tests.
In an alternative embodiment, as shown in fig. 3, the water shortage detection circuit further includes: and the filter capacitor 35 is connected in parallel with the first branch 31 and used for filtering interference, preventing the optical coupler from being conducted mistakenly and improving the anti-interference performance of the water shortage detection circuit.
In another alternative embodiment, the above-mentioned water shortage detection circuit further comprises: a first current limiting resistor 36 connected in series with a first input terminal of the optocoupler; and/or connected in series with the second input terminal of the optocoupler. As shown in fig. 3, the first current limiting resistor 36 is connected in series with the second input end of the optocoupler, so that when the optocoupler is turned on, the optocoupler is prevented from generating a high pulse current, and the optocoupler is protected; of course, in other embodiments, the position thereof may be reasonably set according to needs, and this embodiment does not limit this.
In another alternative embodiment, the above-mentioned water shortage detection circuit further comprises: a second current limiting resistor 37 connected in series with the first output terminal of the optocoupler; and/or, connected in series with the second output of the optocoupler. As shown in fig. 3, the second current limiting resistor 37 is connected in series with the second output terminal of the optocoupler, so as to protect the optocoupler, and when the energy storage capacitor is not charged, a higher pulse current is generated at the moment of switching on, so that the second current limiting resistor is used for current limiting, and when the optocoupler is switched off, a discharging loop is provided for the energy storage capacitor; of course, in other embodiments, the position thereof may be reasonably set according to needs, and this embodiment does not limit this.
In another alternative embodiment, as shown in fig. 3, the water shortage detection circuit further includes: and the discharge resistor 38 is connected with the energy storage capacitor in parallel, and provides a discharge loop for the energy storage capacitor, so that the discharge time is reduced.
In another alternative embodiment, as shown in fig. 3, the water shortage detection circuit further includes: and the controller 4 is connected with the output end of the detection module and used for sending alarm information when the detection module detects that the temperature control module is disconnected. The detection module detects that the temperature control module is disconnected to indicate that the container is in a water shortage state, and the alarm information is used for prompting a user to replenish liquid in the container in time. Specifically, the controller sends out alarm information through controlling alarm device, and alarm information can be audible and visual alarm, can rationally set up as required.
In another alternative embodiment, as shown in fig. 3, the water shortage detection circuit further includes: and the third current limiting resistor 39 is arranged between the second output end of the optocoupler and the controller (such as a control chip), so that high pulse current at an input port of the controller is prevented, and the controller is protected.
In another alternative embodiment, as shown in fig. 3, the water shortage detection circuit further includes: and a switch 5 connected in series with the series circuit for controlling the humidification state of the container. The humidifying control is more flexible by adding the switch, and a user can control the working state of the humidifying device according to the requirement. In particular, the switch may be a relay; of course, in other embodiments, other switches in the prior art can be adopted, and the switch can be set reasonably according to needs.
In another alternative embodiment, the above-mentioned water shortage detection circuit further comprises: the temperature detection module is arranged on the outer wall of the container, is connected with the switch, is also connected with the controller and is used for detecting the temperature of the container; the switch is also connected with the controller, and the controller is also used for controlling the switch to be disconnected when the temperature of the container is higher than a second preset temperature. Therefore, the temperature control module can be effectively prevented from being effectively disconnected in the water shortage state, the heating module is caused to continue heating to cause damage to components, and the dual protection of the water shortage circuit is realized.
The specific working process is as follows, the temperature control module is not disconnected when the water shortage state is abnormal, then the whole loop is still in a conducting state, the heating module continues to generate heat, the surface temperature of the container can continue to rise, when the temperature detection module arranged on the outer wall of the container detects that the temperature of the container is greater than the second preset temperature, the second preset temperature is greater than the first preset temperature, the controller control switch is disconnected, the whole loop is cut off, the heating module stops generating heat, the danger caused by the dry-burning state is prevented, and the safety of the household appliance is improved. For example, the second preset temperature may be 130 degrees celsius; of course, in other embodiments, the second preset temperature can be set as desired.
In an optional embodiment, the heating module and the temperature control module in the water shortage detection circuit can be arranged on the whole household appliance, and other circuits can be arranged on a control board of the household appliance; the arrangement makes the structure of the household appliance more compact, no additional control panel is needed, and the production cost is reduced. In particular, the connection of the two parts is realized by means of a plug terminal, for example, the temperature control module is connected with the detection module by means of the plug terminal.
It should be noted that the selection of the resistor and the capacitor on the output side of the optocoupler in the water shortage detection circuit may be selected according to actual conditions, but the condition that the second output terminal of the optocoupler is still in the high level interval after the half-cycle of discharging must be satisfied. The voltage range of the high level interval can be determined according to the high level interval range which can be identified by a controller (such as a control chip), for example, the high level interval is determined to be greater than 3.3V according to the selected controller, the capacitance value of the electrolytic capacitor can be 10uF, the resistance value of the discharge resistor can be 10k omega, the resistance value of the second current limiting resistor can be 100 omega, and the measured minimum voltage output to the controller is 4.2V and greater than 3.3V, so that the requirement is met.
The specific operation process of the water shortage detection circuit is shown in fig. 4. The water shortage detection circuit controls heating, overheating protection and water shortage detection by using a heating wire, a temperature controller, a relay, an optical coupler and a diode. A heating wire: the heating wire is used for heating water to generate steam, thereby achieving the purpose of humidification. Temperature controller: when the temperature of the heated iron pipe water tank is too high and reaches the temperature point at which the temperature controller is tripped, and the power-off protection effect is achieved. A relay: the aim of controlling humidification is achieved by controlling the on and off of the relay through software. A diode: the three serially connected diodes on the second branch circuit have own conduction voltage drop, and the voltage drop is attached to the optical coupler to supply conduction voltage to the optical coupler so as to promote the optical coupler to be switched on. Optical coupling: and the switching function, the on and off of which meet the requirement of detecting high and low levels by the chip.
The specific process of detecting water is as follows: the relay is controlled to be closed through software (a control program in the controller), after the relay is closed, the heating wire, the temperature controller, the relay and the diode form a passage, the heating wire generates heat, and meanwhile water is supplied for heating to generate steam. Because the commercial power is sine wave, follow current through first branch 31 (first diode) like the first half wave, follow current is then with second branch (three second diode) for the latter half wave, the conduction voltage drop of three second diode itself makes the opto-coupler switch on when the second branch is followed current, first power V1(+5V) then charges electrolytic capacitor after the opto-coupler switches on, when charging to certain voltage, chip IO mouth (the input port of controller) detects the high level. When the first branch circuit is used for follow current, the optocoupler is switched off, the electrolytic capacitor is not charged and discharges through the discharging resistor, the discharging rate is relatively slow, and the chip high level is judged to have a certain voltage interval, so that the chip IO port is still high level after a half period, and the chip IO port works repeatedly according to the sine wave. Therefore, when the water pump works normally, the detected water level is high, and the water state is judged.
The specific process of water shortage detection is as follows: when the heater continuously generates heat, steam continuously evaporates, when water evaporation is less than the default, the heater still can continuously heat, the produced heat of heater then can concentrate and present on the container (iron pipe) of heating this moment, lead to the temperature sharply rising of iron pipe, and the temperature controller is hugged closely on the iron pipe, at this moment, through the heat transfer, the temperature of iron pipe will be passed to the temperature controller, the temperature controller disconnection after the temperature controller reaches the temperature protection point of oneself, after the temperature controller disconnection, whole circuit outage, the opto-coupler no longer switches on this moment, electric quantity in the electrolytic capacitor releases through discharge resistance, voltage IO drops to 0V at last, the mouth detects for the low level this moment, judge for the lack of water.
In the prior art, a liquid level switch or a reed switch is used for water shortage detection, the liquid level switch or the reed switch needs to be led out again and needs to be stretched into a container, and a water shortage detection circuit in the embodiment does not use the liquid level switch or the reed switch, so that the cost is reduced; the wire is arranged on the outer wall of the container and does not need to extend into the container, so that the wiring time and the production and assembly time are reduced; and the risk that the water shortage detection cannot be carried out after the reed switch and the liquid level switch are in failure is reduced, so that the reliability is improved.
The embodiment also provides a household appliance, which comprises any one of the above water shortage detection circuits. Because the water shortage detection circuit with simple circuit structure and convenient wiring, production and installation is adopted, the household appliance also has the advantages of simple structure and convenient wiring, production and installation, and the defects that the water shortage detection device formed by a liquid level switch or a reed switch and the like in the prior art is complicated in wiring and production and assembly are overcome.
In an optional embodiment, the household appliance further comprises a humidifying device, and the water shortage detection circuit is used for detecting whether a container in the humidifying device is in water shortage. Specifically, the household appliance includes an electric heater, i.e., an electric heater having a humidifying function; under the condition that a reed switch or a liquid level switch is not used, the problem of water shortage detection in the humidification process of the electric heater is solved. Of course, in other embodiments, the household appliance may also be other household appliances with humidifying function, such as an air conditioner.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (14)
1. A water shortage detection circuit, comprising: a heating module and a temperature control module,
the heating module is used for heating liquid in the container to evaporate the liquid;
the temperature control module is arranged on the outer wall of the container, is connected with the heating module in series to form a series circuit and is used for being disconnected when the surface temperature of the container exceeds a first preset temperature due to the fact that the liquid in the container is lower than a preset value, and the heating module automatically stops heating after the temperature control module is disconnected;
a detection module, one end of which is connected with one end of the series circuit; the detection module is used for detecting the connection or disconnection of the temperature control module; the detection module comprises: the circuit comprises a first branch circuit, a second branch circuit, an optocoupler device and an energy storage capacitor.
2. The water shortage detection circuit of claim 1 wherein the heat generating module and the temperature control module are not in contact.
3. The water shortage detection circuit of claim 1,
a first end of the first branch is connected with a second end of the second branch and is also connected with the one end of the series circuit; the second end of the first branch is connected with the first end of the second branch; the first branch circuit and the second branch circuit are used for controlling the on or off of the optical coupler;
a first input end of the optical coupler device is connected with a second end of the second branch circuit, a second input end of the optical coupler device is connected with a first end of the second branch circuit, a first output end of the optical coupler device is connected with a first power supply, and a second output end of the optical coupler device is connected with one end of the energy storage capacitor;
and the other end of the energy storage capacitor is connected with a second power supply.
4. The water shortage detection circuit of claim 3,
the first branch comprises a first diode;
the second branch comprises a second diode group comprising at least two second diodes connected in series.
5. The water shortage detection circuit of claim 3, further comprising:
and the filter capacitor is connected with the first branch in parallel.
6. The water shortage detection circuit of claim 3, further comprising:
the first current limiting resistor is connected with the first input end of the optocoupler in series; and/or, connected in series with a second input of the optocoupler device.
7. The water shortage detection circuit of claim 3, further comprising:
the second current limiting resistor is connected with the first output end of the optocoupler in series; and/or, the second output end of the optical coupler device is connected in series.
8. The water shortage detection circuit of any of claims 1-7 wherein the temperature control module comprises an automatic reset temperature controller.
9. The water shortage detection circuit according to any one of claims 1 to 7, further comprising:
and the controller is connected with the output end of the detection module and used for sending alarm information when the detection module detects that the temperature control module is disconnected.
10. The water shortage detection circuit according to any one of claims 1 to 7, further comprising:
and the switch is connected with the series circuit in series and is used for controlling the humidifying state of the container.
11. The water shortage detection circuit of claim 10, further comprising:
the temperature detection module is arranged on the outer wall of the container, is connected with the switch, is also connected with the controller and is used for detecting the temperature of the container;
the switch is further connected with the controller, and the controller is further used for controlling the switch to be disconnected when the temperature of the container is higher than a second preset temperature.
12. A domestic appliance comprising a water shortage detection circuit as claimed in any one of claims 1 to 11.
13. The household appliance according to claim 12, further comprising a humidifying device, wherein the water shortage detection circuit is configured to detect whether a container in the humidifying device is in shortage of water.
14. The household appliance according to claim 12 or 13, characterized in that the household appliance comprises an electric heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811129256.7A CN109268911B (en) | 2018-09-26 | 2018-09-26 | Water shortage detection circuit and household appliance |
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| CN201811129256.7A CN109268911B (en) | 2018-09-26 | 2018-09-26 | Water shortage detection circuit and household appliance |
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| CN109268911B true CN109268911B (en) | 2020-10-09 |
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