CN112449445B - Electric heating circuit, cooking utensil, electric heating device, control method and storage medium - Google Patents
Electric heating circuit, cooking utensil, electric heating device, control method and storage medium Download PDFInfo
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- CN112449445B CN112449445B CN202011363250.3A CN202011363250A CN112449445B CN 112449445 B CN112449445 B CN 112449445B CN 202011363250 A CN202011363250 A CN 202011363250A CN 112449445 B CN112449445 B CN 112449445B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/0019—Circuit arrangements
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/24—Warming devices
- A47J36/2483—Warming devices with electrical heating means
Abstract
The invention provides an electric heating circuit, a cooking utensil, an electric heating device, a control method and a storage medium. The electric heating circuit comprises a controller; the first end of the sensor is connected with the controller; the first end of the electric heating element is connected with the controller, and the second end of the electric heating element is connected with the second end of the sensor; and the first end of the sampling circuit is connected with the controller, the second end of the sampling circuit is connected with the second end of the sensor, and the third end of the sampling circuit is connected with the second end of the electric heating element. According to the invention, the electric heating element and the sensor which are connected with the controller are connected together, so that the controller can alternately output voltage signals to the sensor and the electric heating element, thereby water at the position of the sensor can not be ionized, and the problem of rusting of the sensor is avoided.
Description
Technical Field
The invention belongs to the technical field of kitchen utensils, and particularly relates to an electric heating circuit, a cooking utensil, an electric heating device, a control method of the electric heating device and a readable storage medium.
Background
In the related art, when the thick film evaporator works, a driving signal is applied to the water level probe for detecting the state of the water level in the thick film evaporator, but the method can cause the water level probe to be easily rusted, thereby causing poor products.
Disclosure of Invention
The present invention has been made to solve one of the technical problems occurring in the prior art or the related art.
To this end, a first aspect of the invention proposes an electric heating circuit.
A second aspect of the present invention proposes an electric heating device.
A third aspect of the present invention provides a cooking appliance.
The fourth aspect of the invention provides a control method of an electric heating device.
A fifth aspect of the invention proposes a readable storage medium.
In view of this, according to a first aspect of the present invention, there is provided an electric heating circuit comprising: a controller; the first end of the sensor is connected with the controller; the first end of the electric heating element is connected with the controller, and the second end of the electric heating element is connected with the second end of the sensor; and the first end of the sampling circuit is connected with the controller, the second end of the sampling circuit is connected with the second end of the sensor, and the third end of the sampling circuit is connected with the second end of the electric heating element.
The invention provides an electric heating circuit which comprises a controller, a sensor, an electric heating element, a sensor and a sampling circuit. The controller is connected with the first end of the sensor and the first end of the electric heating element, and the second end of the sensor is connected with the second end of the electric heating element, namely the controller can respectively send voltage signals to the sensor and the electric heating element. The sampling circuit comprises two signal acquisition ends, the second end and the third end of the sampling circuit are respectively connected with the sensor and the electric heating element, namely the sampling circuit acquires sensing signals on the electric heating element and the sensor through the two signal acquisition ends at the second end and the third end. The first end of the sampling circuit is connected with the controller, and the collected sensing signals can be transmitted to the controller so that the controller can control the circuit according to the sensing signals. According to the invention, the electric heating element and the sensor which are connected with the controller are connected together, so that the controller can alternately output voltage signals to the sensor and the electric heating element, thereby water at the position of the sensor can not be ionized, and the problem of rusting of the sensor is avoided.
The sensor in the electric heating circuit is a probe type sensor which is inserted into the containing space for containing water. The sensor and the electric heating element in the electric heating circuit are connected with the wiring terminal, and the sensor is connected with the electric heating element and is connected with the controller through the wiring terminal. The controller can select to input the voltage signal to the sensor or the electric heating element. The controller outputs a voltage signal such as a 5V voltage signal to the sensor to exert a +5V signal on the probe-type sensor, the controller outputs a voltage signal such as a 5V voltage signal to the electric heating element to exert a-5V signal on the probe-type sensor, and when the controller alternately outputs voltage signals to the sensor and the electric heating element, the controller can alternately exert the +5V voltage signal and the-5V voltage signal on the probe-type sensor.
Wherein, sampling circuit's second end and third end link to each other with sensor and electric heating element respectively, when the controller is to sensor output voltage signal, the sensing signal that the sensor transmitted can be gathered to sampling circuit's second end, when the controller is to electric heating element output voltage signal, the sensing signal that the sensor transmitted can be gathered to sampling circuit's third end, the sensing signal on the sensor flows to sampling circuit via electric heating element this moment, realized that the controller is when alternately outputting voltage signal to sensor and electric heating element, the sensing signal that the homoenergetic acquireed sensor output.
In addition, according to the electric heating circuit in the technical scheme provided by the invention, the electric heating circuit also can have the following additional technical characteristics:
in one possible design, the electrical heating circuit further comprises: and the first end of the filter circuit is connected with the second end of the sampling circuit, and the second end of the filter circuit is connected with the third end of the sampling circuit.
In this design, the electrothermal circuit further includes a filter circuit. The filter circuit is connected with the sampling circuit, and specifically, a first end and a second end of the filter circuit are respectively connected with a second end and a third end of the sampling circuit. The filter circuit can filter the signals collected by the second end and the third end of the sampling circuit. The accuracy of the sensing signals collected by the sampling circuit is improved.
In one possible design, the filter circuit includes: the first end of the first capacitive element is connected with the second end of the sampling circuit, and the second end of the first capacitive element is grounded; and the first end of the second capacitive element is connected with the third end of the sampling circuit, and the second capacitive element is grounded.
In this design, the filter circuit includes a first capacitive element and a second capacitive element. The first capacitive element and the second capacitive element are each selected to be a capacitor. Hereinafter, the first capacitor and the second capacitor are referred to as "first capacitor" and "second capacitor". The first end of the first capacitor is connected to the second end of the sampling circuit, the second end of the first capacitor is grounded, and the first capacitor can filter a signal transmitted from the sensor to the second end of the sampling circuit. The first end of the second capacitor is connected to the third section of the sampling circuit, the second end of the second capacitor is grounded, and the second capacitor can filter the signal transmitted to the third end of the sampling circuit by the electric heating element. Through set up two capacitive elements of first electric capacity and second electric capacity in filter circuit to filter the signal of sampling circuit's second end and third end position respectively through two capacitive elements, under the controller in turn to heating element and sensor output voltage signal's the condition, can filter the signal of gathering through this filter circuit, avoid signal distortion.
In one possible design, the filter circuit includes: a first resistive element, a first terminal of the first resistive element being coupled to a first terminal of the first capacitive element, a second terminal of the first resistive element being coupled to a second terminal of the sensor; and a second resistive element, a first end of the second resistive element being connected to a second end of the second capacitive element, a second end of the second resistive element being connected to a second end of the electrocaloric element.
In this design, the filter circuit further includes a first resistive element and a second resistive element, and the first resistive element and the second resistive element are resistors, which will be referred to as a first resistor and a second resistor. The first resistor and the first capacitor are connected in series and then grounded, namely the first resistor and the first capacitor form a first filter circuit for filtering the sensing signal output by the sensor. The second resistor and the second capacitor are connected in series and then are grounded, namely the second resistor and the second capacitor form a second filter circuit for filtering the sensing signal transmitted by the sensor through the electrothermal element.
It is understood that the filter circuit includes a first filter circuit and a second filter circuit. When the controller alternately outputs voltage signals to the sensor and the heating element, the first filter circuit and the second filter circuit can filter the sensing signals collected by the sampling circuit. The controller can continuously acquire the sensing signals through the sampling circuit when the controller alternately sends the voltage signals, and under the filtering action of the first filter circuit and the second filter circuit, the controller can accurately acquire the sensing signals sent by the sensor no matter the controller outputs the voltage signals to the sensor or the controller outputs the voltage signals to the electric heating element.
In one possible design, the electrical heating circuit further comprises: a third resistive element, a first end of the third resistive element being coupled to the controller, a second end of the third resistive element being coupled to the first end of the sensor; a fourth resistive element, a first end of the fourth resistive element being coupled to the controller, a second end of the fourth resistive element being coupled to the first end of the electrothermal element.
In this design, the electrothermal circuit further includes a third resistive element and a fourth resistive element.
The third resistive element and the fourth resistive element are resistors, and hereinafter referred to as a third resistor and a fourth resistor. The third resistor is connected in series at a position between the controller and the sensor, and the third resistor can play a role in limiting current flowing through the sensor, so that the sensor is prevented from being damaged due to impact of overlarge current on the sensor, and the use stability of the sensor is further improved.
The fourth resistor is connected in series between the controller and the electric heating element, the fourth resistor can play a role in limiting the current flowing through the electric heating element, the electric heating element is prevented from being damaged due to the fact that the electric heating element is impacted by overlarge current, and the using stability of the electric heating element is further improved.
According to a second aspect of the present invention there is provided an electric heating device comprising: the device comprises a shell, a first accommodating cavity and a second accommodating cavity, wherein the first accommodating cavity is formed in the shell; in any one of the above possible designs of the first aspect, the electric heating circuit is disposed in the housing, and a sensor of the electric heating circuit is located in the first accommodating cavity.
The invention provides an electric heating device, which comprises a shell and the electric heating circuit in the first aspect, wherein the electric heating circuit is arranged in the shell. A first containing cavity is further formed in the shell and used for containing liquid, and an electric heating element in the electric heating circuit is arranged corresponding to the first containing cavity, namely the electric heating element is located in the projection of the first containing cavity perpendicular to the horizontal plane. The liquid in the first accommodating cavity is heated through the electric heating element, the sensor is located in the first accommodating cavity, and the sensor can detect the liquid state in the first accommodating cavity.
In particular, the electric heating device is selected as a thick film evaporator, an evaporator device for generating steam. The first accommodating cavity is used for accommodating water, and the electric heating element is electrified to work and can heat the water in the first accommodating cavity, so that the water forms steam. The sensor is selected as a liquid level sensor, is arranged in the first accommodating cavity and can detect the liquid level state in the first accommodating cavity. The sensor in the electric heating circuit is a probe type sensor, and the probe type sensor is inserted into the accommodating space for accommodating water. The sensor and the electric heating element in the electric heating circuit are connected with the wiring terminal, and the sensor is connected with the electric heating element and is connected with the controller through the wiring terminal. The controller can select to input the voltage signal to the sensor or the electric heating element. The controller outputs a voltage signal, such as a 5V voltage signal, to the sensor to exert a +5V signal on the probe-type sensor, and outputs a voltage signal, such as a 5V voltage signal, to the electric heating element to exert a-5V signal on the probe-type sensor, and when the controller alternately outputs voltage signals to the sensor and the electric heating element, the controller can alternately exert the +5V voltage signal and the-5V voltage signal on the probe-type sensor, and because the voltage between the probe-type sensor and the electric heating element is in a changing state, water can be prevented from being ionized at the position of the probe-type sensor, and further, the antirust effect is achieved.
In addition, according to the electric heating device in the above technical scheme provided by the invention, the electric heating device can also have the following additional technical characteristics:
in one possible design, the sensor is a probe level sensor.
In the design, the probe type liquid level sensor is arranged in a first accommodating cavity of the electric heating device and can detect the liquid level in the first accommodating cavity. When the controller was to probe-type level sensor and electric heating element alternating input voltage signal, when the controller was to probe-type level sensor output voltage signal, there was the positive voltage on the level sensor, when the controller was to electric heating element output voltage signal, there was the negative voltage on the probe-type level sensor, through the positive negative relation of the voltage on the alternative change level sensor, can avoid the water on the level sensor to be ionized to avoid level sensor to rust.
It can be understood that the sensor can also be selected as a probe-type temperature sensor, etc., and the sensor arranged in the first accommodating cavity can be prevented from rusting through the circuit connection mode.
According to a third aspect of the present invention there is provided a cooking appliance comprising: the shell is internally provided with a second accommodating cavity; an electric heating device as in any one of the possible designs of the second aspect, disposed in the housing, the electric heating device being configured to generate steam; and the steam pipeline is arranged in the shell, two ends of the steam pipeline are respectively connected with the second accommodating cavity and the electric heating device, and the steam pipeline is used for conveying steam generated by the electric heating device into the second accommodating cavity.
The invention provides a cooking appliance comprising a housing, a steam line and an electric heating device as in the second aspect above. The first accommodating cavity of the electric heating device is filled with water for generating steam, and the water is heated in the electric heating device to generate steam. The cooking utensil comprises a second containing cavity, the second containing cavity is used for containing food to be cooked, the second containing cavity of the cooking utensil is communicated with the first containing cavity of the electric heating device through the steam pipeline, so that steam generated in the first containing cavity is input into the second containing cavity through the steam pipeline, and steam cooking is carried out on the food in the second containing cavity.
Since the cooking appliance includes the electric heating device in the second aspect, the cooking appliance has all the beneficial technical effects of the electric heating device in the second aspect, i.e. the probe-type temperature sensor in the electric heating device can be prevented from rusting, and the description is not repeated herein.
In addition, according to the cooking utensil in the above technical solution provided by the present invention, the following additional technical features may also be provided:
in one possible design, the cooking appliance includes a steam box, a steam oven, and a micro-steaming and baking all-in-one machine.
In this design, the cooking appliance can be selected from a steam box, a steaming oven and a micro-steaming and baking all-in-one machine, and the cooking appliance includes, but is not limited to, the three.
According to a fourth aspect of the present invention, there is provided a control method for an electric heating apparatus, as in any one of the possible designs of the second aspect, including: alternately outputting voltage signals to the sensor and the electrothermal element; the liquid level signal is obtained through the sampling circuit, and the liquid level state in the first accommodating cavity is determined according to the liquid level signal.
The present invention provides a control method for an electric heating apparatus, which is used for the electric heating apparatus in any one of the possible designs of the second aspect. The control method comprises the steps that the controller outputs voltage signals to the sensor and the electrothermal element alternately, specifically, the controller outputs the voltage signals to the sensor first, outputs the voltage signals to the electrothermal element while stopping outputting the voltage signals to the sensor, and outputs the voltage signals to the sensor again while stopping outputting the voltage signals to the electrothermal element, wherein the electrothermal element is connected with the sensor, and the voltage signals are alternately output to the electrothermal element and the sensor, so that the sensor alternates between positive voltage signals and negative voltage signals, namely, the voltage between the sensor and the heating element is in a changing state, water at the sensor cannot be ionized, and the sensor is placed to rust. Can acquire the liquid level signal through sampling circuit, can directly detect the liquid level state in electric heating device's the first holding intracavity according to the liquid level signal, and the sensor has rust-resistant function.
In some embodiments, the controller can select to input the voltage signal to the sensor or the electrocaloric element. The controller outputs a voltage signal such as a 5V voltage signal to the sensor to exert a +5V signal on the probe-type sensor, the controller outputs a voltage signal such as a 5V voltage signal to the electric heating element to exert a-5V signal on the probe-type sensor, and when the controller alternately outputs voltage signals to the sensor and the electric heating element, the controller can alternately exert the +5V voltage signal and the-5V voltage signal on the probe-type sensor.
In addition, according to the control method of the electric heating device in the above technical solution provided by the present invention, the following additional technical features may be further provided:
in a possible design, the step of alternately outputting the voltage signal to the sensor and the electric heating element specifically comprises: outputting a first voltage signal to a first end of the sensor, and outputting a second voltage signal to a second end of the electric heating element until a first set time length is reached; and outputting a first voltage signal to the first end of the electrothermal element, outputting a second voltage signal to the first end of the sensor until a second set time length is reached, and returning to execute the step of outputting the voltage signal to the first end of the sensor.
In the design, the step of alternately outputting the voltage signals to the sensor and the electrothermal element comprises that when the electrothermal device receives an instruction for starting operation, the controller continuously outputs a first voltage signal to the first end of the sensor and outputs a second voltage signal to the first end of the electrothermal element, after a first set duration, the controller continuously outputs the first voltage signal to the first end of the electrothermal element and outputs the second voltage signal to the first end of the sensor, after a second set duration, the controller stops outputting the first voltage signal to the first end of the electrothermal element, and the step of returning to execute the steps of outputting the first voltage signal to the first end of the sensor and outputting the second voltage signal to the first end of the electrothermal element. According to the mode, the voltage signals can be alternately output to the sensor and the electrothermal element, the first voltage signal and the second voltage signal are reasonably configured, and the sensor can be rustproof on the premise of not influencing the stable work of the sensor and the electrothermal element.
It will be appreciated that, since the second terminal of the sensor and the second terminal of the electrocaloric element are connected, the direction of current flow through the sensor and the electrocaloric element can be changed by alternately outputting a voltage signal to the first terminal of the sensor and the first terminal of the electrocaloric element. When a voltage signal is output to the first end of the sensor, current firstly flows through the sensor and then flows through the electrothermal element, when the voltage signal is output to the first end of the electrothermal element, the current firstly flows through the electrothermal element and then flows through the sensor, and the positive voltage and the negative voltage at the sensor are switched by changing the flowing direction of the current between the sensor and the electrothermal element, so that water around the sensor can be effectively prevented from being ionized, and an effective anti-rust effect is further achieved.
In some embodiments, the first voltage signal is +5V and the second voltage signal is 0V, i.e. when the +5V voltage signal is output to the first end of the sensor, no voltage signal is output to the electrocaloric element, and when the +5V voltage signal is output to the first end of the electrocaloric element, no voltage signal is output to the sensor. During the process of alternately outputting voltage signals to the sensor and the electric heating element, the voltage on the sensor is switched between +5V and-5V, thereby preventing the water from being ionized by the voltage on the sensor.
In one possible design, the voltage value of the first voltage signal is greater than the voltage value of the second voltage signal.
In the design, the magnitude relation of the voltage values of the first voltage signal and the second voltage signal is configured, so that the first voltage signal is larger, namely, the forward voltage signal is output to the sensor firstly, and then the forward voltage signal is output to the electric heating element.
In some embodiments, the first voltage signal is a +5V voltage and the second voltage signal is a 0V voltage.
In a possible design, the step of obtaining the liquid level signal by the sampling circuit specifically includes: acquiring a first liquid level signal through a second end of the sampling circuit based on the output voltage signal to the sensor; and acquiring a second liquid level signal through a third end of the sampling circuit based on the voltage signal output to the electric heating element.
In the design, because the sensor is connected with the electric heating element, when the controller outputs a voltage signal to the sensor, current firstly flows through the sensor and then flows through the electric heating element, and a first liquid level signal on the sensor can be directly collected through the second end of the sampling circuit. When the controller is to electric heating element output voltage signal, the electric current flows through electric heating element earlier and flows through the sensor again, can directly gather the second liquid level signal through sampling circuit's third section this moment, link to each other sampling circuit's second end and third end with the second end of sensor and electric heating element's second end respectively, realized can acquireing the first liquid level signal and the second liquid level signal that the sensor detected through sampling circuit, no matter the controller is to sensor output voltage signal promptly, still the controller is to electric heating element output voltage signal, all can gather liquid level signal through sampling circuit, the liquid level state in the first holding intracavity of electric heating device has been realized gathering in real time through sampling circuit.
In a possible design, the step of determining the liquid level state in the first accommodating chamber according to the liquid level signal specifically includes: acquiring a first set liquid level signal and a second set liquid level signal; and determining the liquid level state in the first accommodating cavity according to the comparison result of the first liquid level signal and the first set liquid level signal and/or the comparison result of the second liquid level signal and the second set liquid level signal.
In the design, when the liquid level state of the electric heating device is determined, a standard signal needs to be set, and before the controller works, the standard signal of the electric heating device is set, namely a first set liquid level signal and a second set liquid level signal are prestored. And comparing the first set liquid level signal with the second set liquid level signal with the first liquid level signal and the second liquid level signal which are actually acquired, and determining the liquid level state in the first accommodating cavity of the electric heating device according to the result obtained by comparison.
In some embodiments, the first level signal and the second level signal collected by the sampling circuit are used as standard signals.
In other embodiments, when no liquid exists in the first accommodating cavity, the first liquid level signal and the second liquid level signal acquired by the sampling circuit are selected as standard signals.
According to a fifth aspect of the present invention, a readable storage medium is provided, on which a program or instructions are stored, which when executed by a processor, implement the steps of the control method of an electric heating device as in any one of the possible designs described above. Therefore, the control method of the electric heating device in any possible design has all the beneficial technical effects, and redundant description is not repeated herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a circuit diagram of an electrothermal circuit in a first embodiment of the present invention;
FIG. 2 shows a circuit diagram of an electrothermal circuit in a second embodiment of the present invention;
FIG. 3 is a schematic view showing the construction of an electric heating apparatus in a third embodiment of the present invention;
FIG. 4 is a schematic flow chart showing a control method of an electric heating apparatus in a fifth embodiment of the invention;
FIG. 5 is a view showing one of flow charts of a control method of an electric heating apparatus in a sixth embodiment of the invention;
FIG. 6 is a second flowchart of a method for controlling an electric heating apparatus according to a sixth embodiment of the present invention;
fig. 7 shows a third flowchart of a method for controlling an electric heating apparatus according to a sixth embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the component names in fig. 1, fig. 2 and fig. 3 is:
100 an electrical heater circuit, 110 a sensor, 120 an electrical heater element, 130 a sampling circuit, 140 a filter circuit, 142 a first capacitive element, 144 a second capacitive element, 146 a first resistive element, 148 a second resistive element, 150 a third resistive element, 160 a fourth resistive element, 200 an electrical heater device, 202 a housing.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein and, therefore, the scope of the present invention is not limited by the specific embodiments disclosed below.
An electric heating circuit, an electric heating apparatus, a cooking appliance, a control method of an electric heating apparatus, and a readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 7.
The first embodiment is as follows:
as shown in fig. 1, a first embodiment of the present invention provides an electrothermal circuit 100 comprising: a controller, a sensor 110, an electrical heating element 120, and a sampling circuit 130. The first end of the sensor 110 is connected with the controller, the controller is connected with the first end of the electric heating element 120, the second end of the sensor 110 is connected with the second end of the electric heating element 120, the controller is connected with the first end of the sampling circuit 130, the sensor 110 is connected with the second end of the sampling circuit 130, and the electric heating element 120 is connected with the second end of the third end of the sampling circuit 130.
In this embodiment, the electrocaloric circuit 100 includes a controller, a sensor 110, an electrocaloric element 120, the sensor 110, and a sampling circuit 130. The controller is coupled to a first end of the sensor 110 and a first end of the electrocaloric element 120, and a second end of the sensor 110 is coupled to a second end of the electrocaloric element 120, i.e., the controller is capable of sending voltage signals to the sensor 110 and the electrocaloric element 120, respectively. The sampling circuit 130 comprises two signal acquisition ends, the second end and the third end of the sampling circuit 130 are respectively connected with the sensor 110 and the electric heating element 120, namely the sampling circuit 130 acquires the sensing signals on the electric heating element 120 and the sensor 110 through the two signal acquisition ends at the second end and the third end. The first end of the sampling circuit 130 is connected to the controller, and can transmit the collected sensing signal to the controller, so that the controller can control the circuit according to the sensing signal. According to the invention, the electric heating element and the sensor which are connected with the controller are connected together, so that the controller can alternately output voltage signals to the sensor and the electric heating element, thereby water at the position of the sensor can not be ionized, and the problem of rusting of the sensor is avoided.
The sensor 110 in the electric heating circuit 100 is a probe-type sensor 110, and the probe-type sensor 110 is inserted into the accommodating space for accommodating water. The sensor 110 and the electric heating element 120 in the electric heating circuit 100 are connected with terminals, and the sensor 110 and the electric heating element 120 are connected with a controller through the terminals. The controller can select to input a voltage signal to the sensor 110 or the electrocaloric element 120. The controller outputs a voltage signal, such as a 5V voltage signal, to the sensor 110 to apply a +5V signal to the probe-type sensor 110, and outputs a voltage signal, such as a 5V voltage signal, to the electric heating element 120 to apply a-5V signal to the probe-type sensor 110, and when the controller alternately outputs voltage signals to the sensor 110 and the electric heating element 120, the controller can alternately apply +5V and-5V voltage signals to the probe-type sensor 110, and since the voltage between the probe-type sensor 110 and the electric heating element 120 is in a variable state, water can be prevented from being ionized at the position of the probe-type sensor 110, and a rust prevention effect is achieved.
The second end and the third end of the sampling circuit 130 are respectively connected with the sensor 110 and the electric heating element 120, when the controller outputs a voltage signal to the sensor 110, the second end of the sampling circuit 130 can collect a sensing signal transmitted by the sensor 110, when the controller outputs a voltage signal to the electric heating element 120, the third end of the sampling circuit 130 can collect a sensing signal transmitted by the sensor 110, at the moment, the sensing signal on the sensor 110 flows to the sampling circuit 130 through the electric heating element 120, and the sensing signal output by the sensor 110 can be obtained when the controller alternately outputs voltage signals to the sensor 110 and the electric heating element 120.
The second embodiment:
as shown in fig. 2, a second embodiment of the present invention provides an electric heating circuit 100, comprising: a controller, a sensor 110, an electrical heating element 120, a sampling circuit 130, and a filter circuit 140. The first end of the sensor 110 is connected with the controller, the controller is connected with the first end of the electric heating element 120, the second end of the sensor 110 is connected with the second end of the electric heating element 120, the controller is connected with the first end of the sampling circuit 130, the sensor 110 is connected with the second end of the sampling circuit 130, and the electric heating element 120 is connected with the second end of the third end of the sampling circuit 130. The sampling circuit 130 is connected to a second terminal of the first terminal of the filter circuit 140, and the sampling circuit 130 is connected to a third terminal of the second terminal of the filter circuit 140.
In this embodiment, the electro-thermal circuit 100 further includes a filter circuit 140. The filter circuit 140 is connected to the sampling circuit 130, and specifically, a first terminal and a second terminal of the filter circuit 140 are respectively connected to a second terminal and a third terminal of the sampling circuit 130. The filtering circuit 140 can filter the signals collected by the second terminal and the third terminal of the sampling circuit 130. The accuracy of the sensing signal collected by the sampling circuit 130 is improved.
In the above embodiment, the filter circuit 140 includes the first capacitive element 142 and the second capacitive element 144, and the first capacitive element 142 and the second capacitive element 144 are capacitors, which will be referred to as a first capacitor and a second capacitor. The second end of the sampling circuit 130 is connected with the first end of the first capacitor, and the second end of the first capacitor is grounded; the third terminal of the sampling circuit 130 is connected to the first terminal of the second capacitor, and the second capacitor is grounded.
In this embodiment, the filter circuit 140 includes a first capacitor and a second capacitor. The first terminal of the first capacitor is connected to the second terminal of the sampling circuit 130, the second terminal of the first capacitor is grounded, and the first capacitor is capable of filtering the signal transmitted from the sensor 110 to the second terminal of the sampling circuit 130. The first end of the second capacitor is connected to the third section of the sampling circuit 130, the second end of the second capacitor is grounded, and the second capacitor can filter the signal transmitted from the electric heating element 120 to the third end of the sampling circuit 130. By arranging the first capacitor and the second capacitor in the filter circuit 140, and by filtering the signals at the second end and the third end of the sampling circuit 130 through the two capacitors, the collected signals can be filtered through the filter circuit 140 under the condition that the controller alternately outputs voltage signals to the heating element and the sensor 110, and signal distortion is avoided.
In any of the above embodiments, the filter circuit 140 further includes a first resistive element 146 and a second resistive element 148, and the first resistive element 146 and the second resistive element 148 are resistors, hereinafter referred to as a first resistor and a second resistor. A first terminal of the first resistor is connected to a first terminal of the first capacitive element 142, and a second terminal of the first resistor is connected to a second terminal of the sensor 110; a first end of the second resistor is connected to a second end of the second capacitive element 144 and a second end of the second resistor is connected to a second end of the electrocaloric element 120.
In this embodiment, the filter circuit 140 further includes a first resistor and a second resistor. The first resistor and the first capacitor are connected in series and then grounded, that is, the first resistor and the first capacitor form a first filter circuit 140 for filtering the sensing signal output by the sensor 110. The second resistor and the second capacitor are connected in series and then grounded, that is, the second resistor and the second capacitor form a second filter circuit 140 for filtering the sensing signal transmitted by the sensor 110 via the electric heating element 120.
It is understood that the filter circuit 140 includes a first filter circuit 140 and a second filter circuit 140. The first and second filter circuits 140, 140 can filter the sensing signal collected by the sampling circuit 130 as the controller alternately outputs voltage signals to the sensor 110 and the heating element. When the controller alternately sends voltage signals, the controller can uninterruptedly acquire the sensing signals through the sampling circuit 130, and under the filtering action of the first filter circuit 140 and the second filter circuit 140, the controller can accurately acquire the sensing signals sent by the sensor 110 no matter the controller outputs the voltage signals to the sensor 110 or the controller outputs the voltage signals to the electric heating element 120.
In any of the embodiments described above, the electric heating circuit 100 further includes a third resistive element 150 and a fourth resistive element 160. Each of the third resistive element 150 and the fourth resistive element 160 is a resistor, and will be referred to as a third resistor and a fourth resistor hereinafter. The first end of the third resistor is connected to the controller, the second end of the third resistor is connected to the first end of the sensor 110, the first end of the fourth resistor is connected to the controller, and the second end of the fourth resistor is connected to the first end of the electric heating element 120.
In this embodiment, the third resistor is connected in series between the controller and the sensor 110, and the third resistor can play a role of limiting the current flowing through the sensor 110, so as to prevent the sensor 110 from being damaged due to the impact of the excessive current on the sensor 110, and further improve the stability of the use of the sensor 110.
The fourth resistor is connected in series between the controller and the electric heating element 120, and the fourth resistor can limit the current flowing through the electric heating element 120, so that the electric heating element 120 is prevented from being damaged due to the impact of the excessive current on the electric heating element 120, and the use stability of the electric heating element 120 is further improved.
Example three:
as shown in fig. 3, in a third embodiment of the present invention, there is provided an electric heating apparatus 200, including: a housing 202 and an electric heating circuit 100 as in the first or second embodiments. A first accommodating cavity is formed in the housing 202, the electric heating circuit 100 is disposed in the housing 202, and the sensor 110 of the electric heating circuit 100 is located in the first accommodating cavity.
In this embodiment, the electric heating apparatus 200 includes a housing 202 and the electric heating circuit 100 of the first or second embodiment, and the electric heating circuit 100 is disposed in the housing 202. A first accommodating cavity is further disposed in the casing 202, the first accommodating cavity is used for accommodating liquid, and the electric heating element 120 in the electric heating circuit 100 is disposed corresponding to the first accommodating cavity, that is, the electric heating element 120 is located in a projection of the first accommodating cavity perpendicular to a horizontal plane. The liquid in the first accommodating cavity is heated by the electric heating element 120, the sensor 110 is located in the first accommodating cavity, and the sensor 110 can detect the liquid state in the first accommodating cavity.
The electric heating device 200 is selected as a thick film evaporator, an evaporator device for generating steam. The first accommodating cavity is used for accommodating water, and the electric heating element 120 is electrified to work and can heat the water in the first accommodating cavity, so that the water forms steam. The sensor 110 is selected as a liquid level sensor 110, is arranged in the first accommodating cavity, and can detect the liquid level state in the first accommodating cavity. The sensor 110 in the electric heating circuit 100 is a probe-type sensor 110, and the probe-type sensor 110 is inserted into the accommodating space for accommodating water. The sensor 110 and the electric heating element 120 in the electric heating circuit 100 are connected with terminals, and the sensor 110 and the electric heating element 120 are connected with a controller through the terminals. The controller can select to input a voltage signal to the sensor 110 or the electrocaloric element 120. The controller outputs a voltage signal, such as a 5V voltage signal, to the sensor 110 to apply a +5V signal to the probe-type sensor 110, and outputs a voltage signal, such as a 5V voltage signal, to the electric heating element 120 to apply a-5V signal to the probe-type sensor 110, and when the controller alternately outputs voltage signals to the sensor 110 and the electric heating element 120, the controller alternately applies a +5V voltage signal and a-5V voltage signal to the probe-type sensor 110, so that the voltage between the probe-type sensor 110 and the electric heating element 120 is in a changing state, water can be prevented from being ionized at the position of the probe-type sensor 110, and a rust prevention effect is achieved.
In the above embodiment, the sensor 110 is a probe-type level sensor 110.
In this embodiment, the probe-type liquid level sensor 110 is disposed in the first receiving cavity of the electric heating apparatus 200, and can detect the liquid level in the first receiving cavity. When the controller inputs voltage signals to the probe-type liquid level sensor 110 and the electric heating element 120 alternately, when the controller outputs voltage signals to the probe-type liquid level sensor 110, positive voltage exists on the liquid level sensor 110, when the controller outputs voltage signals to the electric heating element 120, negative voltage exists on the probe-type liquid level sensor 110, and through alternately changing the positive and negative relation of the voltage on the liquid level sensor 110, water on the liquid level sensor 110 can be prevented from being ionized, so that the liquid level sensor 110 is prevented from rusting.
It is understood that the sensor 110 may also be a probe-type temperature sensor 110, etc., and the sensor 110 disposed in the first receiving cavity can be prevented from rusting due to the above-mentioned circuit connection.
Example four:
in a fourth embodiment of the present invention, there is provided a cooking appliance including: a shell and the electric heating device in the third embodiment. The shell is internally provided with a second accommodating cavity, the electric heating device is arranged on the shell and is used for generating steam; and the steam pipeline is arranged in the shell, two ends of the steam pipeline are respectively connected with the second accommodating cavity and the electric heating device, and the steam pipeline is used for conveying steam generated by the electric heating device to the second accommodating cavity.
In this embodiment, the cooking appliance comprises a housing, a steam line and an electric heating device as in the third embodiment described above. The first accommodating cavity of the electric heating device is filled with water for generating steam, and the water is heated in the electric heating device to generate steam. The cooking utensil comprises a second containing cavity, the second containing cavity is used for containing food to be cooked, the second containing cavity of the cooking utensil is communicated with the first containing cavity of the electric heating device through the steam pipeline, so that steam generated in the first containing cavity is input into the second containing cavity through the steam pipeline, and steam cooking is carried out on the food in the second containing cavity.
Since the cooking appliance includes the electric heating device in the third embodiment, the electric heating device in the third embodiment has all the beneficial technical effects, i.e., the probe-type temperature sensor in the electric heating device can be prevented from rusting, and thus, redundant description is not repeated herein.
In the above embodiments, the cooking appliance includes a steam box, a steaming oven, and a micro-steaming and baking all-in-one machine, and the cooking appliance includes, but is not limited to, the above three types.
Example five:
as shown in fig. 4, a fifth embodiment of the present invention provides a control method of an electric heating apparatus for the electric heating apparatus according to the third embodiment, including:
and 406, determining the liquid level state in the first accommodating cavity of the electric heating device according to the liquid level signal.
In this embodiment, the control method of the electric heating apparatus is used for the electric heating apparatus as in the third embodiment. The control method comprises the steps that the controller outputs voltage signals to the sensor and the electrothermal element alternately, specifically, the controller outputs the voltage signals to the sensor first, outputs the voltage signals to the electrothermal element while stopping outputting the voltage signals to the sensor, and outputs the voltage signals to the sensor again while stopping outputting the voltage signals to the electrothermal element, wherein the electrothermal element is connected with the sensor, and the voltage signals are alternately output to the electrothermal element and the sensor, so that the sensor alternates between positive voltage signals and negative voltage signals, namely, the voltage between the sensor and the heating element is in a changing state, water at the sensor cannot be ionized, and the sensor is placed to rust. Can acquire the liquid level signal through sampling circuit, can directly detect the liquid level state in electric heating device's the first holding intracavity according to the liquid level signal, and the sensor has rust-resistant function.
In some embodiments, the controller can select to input the voltage signal to the sensor or the electrocaloric element. The controller outputs a voltage signal, such as a 5V voltage signal, to the sensor to exert a +5V signal on the probe-type sensor, and outputs a voltage signal, such as a 5V voltage signal, to the electric heating element to exert a-5V signal on the probe-type sensor, and when the controller alternately outputs voltage signals to the sensor and the electric heating element, the controller can alternately exert the +5V voltage signal and the-5V voltage signal on the probe-type sensor, and because the voltage between the probe-type sensor and the electric heating element is in a changing state, water can be prevented from being ionized at the position of the probe-type sensor, and further, the antirust effect is achieved.
Example six:
as shown in fig. 5, a sixth embodiment of the present invention provides a control method of an electric heating apparatus for the electric heating apparatus according to the third embodiment, including:
step 504, outputting a first voltage signal to a first end of the sensor, and outputting a second voltage signal to a second end of the electric heating element until a first set time length is reached;
and 510, acquiring a liquid level signal, and determining the liquid level state in the first accommodating cavity of the electric heating device according to the liquid level signal.
In this embodiment, the step of alternately outputting the voltage signal to the sensor and the electrothermal element includes the step of, after the operation start command is received by the electrothermal device, continuously outputting the first voltage signal to the first end of the sensor and outputting the second voltage signal to the first end of the electrothermal element by the controller, after a first set duration, continuously outputting the first voltage signal to the first end of the sensor and outputting the second voltage signal to the first end of the sensor while stopping outputting the first voltage signal to the first end of the electrothermal element, after a second set duration, stopping outputting the first voltage signal to the first end of the electrothermal element, and returning to perform the steps of outputting the first voltage signal to the first end of the sensor and outputting the second voltage signal to the first end of the electrothermal element. According to the mode, the voltage signals can be alternately output to the sensor and the electrothermal element, the first voltage signal and the second voltage signal are reasonably configured, and the sensor can be rustproof on the premise of not influencing the stable work of the sensor and the electrothermal element. Can acquire the liquid level signal through sampling circuit, can directly detect the liquid level state in electric heating device's the first holding intracavity according to the liquid level signal, and the sensor has rust-resistant function.
It will be appreciated that, since the second terminal of the sensor and the second terminal of the electrocaloric element are connected, the direction of current flow through the sensor and the electrocaloric element can be changed by alternately outputting a voltage signal to the first terminal of the sensor and the first terminal of the electrocaloric element. When a voltage signal is output to the first end of the sensor, current firstly flows through the sensor and then flows through the electrothermal element, when the voltage signal is output to the first end of the electrothermal element, the current firstly flows through the electrothermal element and then flows through the sensor, and the positive voltage and the negative voltage at the sensor are switched by changing the flowing direction of the current between the sensor and the electrothermal element, so that water around the sensor can be effectively prevented from being ionized, and an effective anti-rust effect is further achieved.
In some embodiments, the first voltage signal is +5V and the second voltage signal is 0V, i.e. when the +5V voltage signal is output to the first end of the sensor, no voltage signal is output to the electrocaloric element, and when the +5V voltage signal is output to the first end of the electrocaloric element, no voltage signal is output to the sensor. During the alternating output of the voltage signals to the sensor and the electrical heating element, the voltage across the sensor is switched between +5V and-5V, thereby avoiding ionization of the water by the voltage across the sensor.
In some embodiments, the voltage value of the first voltage signal is greater than the voltage value of the second voltage signal.
In the embodiments, the magnitude relationship between the voltage values of the first voltage signal and the second voltage signal is configured so that the first voltage signal is larger, that is, the forward voltage signal is output to the sensor first, and the forward voltage signal is output to the electric heating element backward.
In some embodiments, the first voltage signal is a +5V voltage and the second voltage signal is a 0V voltage.
As shown in fig. 6, in any of the above embodiments, the step of acquiring the liquid level signal specifically includes:
and step 604, outputting a voltage signal to the electric heating element, and acquiring a second liquid level signal through a third end of the sampling circuit.
In this embodiment, because the sensor is connected with the electrical heating element, when the controller outputs a voltage signal to the sensor, the current flows through the sensor and then flows through the electrical heating element, and the first liquid level signal on the sensor can be directly acquired through the second end of the sampling circuit. When the controller is to electric heating element output voltage signal, the electric current flows through electric heating element earlier and flows through the sensor again, can directly gather the second liquid level signal through sampling circuit's third section this moment, link to each other sampling circuit's second end and third end with the second end of sensor and electric heating element's second end respectively, realized can acquireing the first liquid level signal and the second liquid level signal that the sensor detected through sampling circuit, no matter the controller is to sensor output voltage signal promptly, still the controller is to electric heating element output voltage signal, all can gather liquid level signal through sampling circuit, the liquid level state in the first holding intracavity of electric heating device has been realized gathering in real time through sampling circuit.
As shown in fig. 7, in any of the above embodiments, the step of determining the liquid level state in the first accommodating chamber according to the liquid level signal specifically includes:
and step 706, determining the liquid level state according to the first comparison result and/or the second comparison result.
In this embodiment, when determining the liquid level state of the electric heating device, the standard signal needs to be set, and before the controller works, the standard signal of the electric heating device is set, that is, the first set liquid level signal and the second set liquid level signal are prestored. And comparing the first set liquid level signal with the second set liquid level signal with the first liquid level signal and the second liquid level signal which are actually acquired, and determining the liquid level state in the first accommodating cavity of the electric heating device according to the result obtained by comparison.
In some embodiments, the first level signal and the second level signal collected by the sampling circuit are used as standard signals.
In other embodiments, when no liquid exists in the first accommodating cavity, the first liquid level signal and the second liquid level signal acquired by the sampling circuit are selected as standard signals.
Example seven:
in one complete embodiment, as shown in fig. 3, there is provided an electric heating device comprising: the casing, set up heating element and the sensor in the casing, heating element chooses for use the hot plate to and the sensor chooses for use the water level probe. A first accommodating cavity is formed in the shell, and the sensor is located in the first accommodating cavity.
In this embodiment, water level probe and hot plate all link to each other with the controller through signal line 1 and signal line 2, and the singlechip is chooseed for use to the controller. The single chip microcomputer outputs a 5V signal to the signal line 1, and simultaneously outputs a 0V signal to the signal line 2 for 40ms, and a first water level signal is collected. The single chip microcomputer outputs 5V signals to the signal line 2, outputs 0V signals to the signal line 1 at the same time, lasts for 40ms, and collects second water level signals. And comparing and judging the first water level signal and the second water level signal and the first set water level signal and the second set water level signal to determine the water level state in the first accommodating cavity.
The first set water level signal and the second set water level signal are obtained by determining water level signals acquired when the first accommodating cavity is in a water state and the first accommodating cavity is in a non-water state.
The controller outputs a voltage signal to the sensor first, outputs the voltage signal to the electric heating element when stopping outputting the voltage signal to the sensor, and outputs the voltage signal to the sensor again when stopping outputting the voltage signal to the electric heating element, wherein the electric heating element is connected with the sensor. Can acquire the liquid level signal through sampling circuit, can directly detect the liquid level state in electric heating device's the first holding intracavity according to the liquid level signal, and the sensor has rust-resistant function.
Compared with the electric heating device in the related art, the sensor or the electric heating element is directly grounded, water contacted with the sensor can be prevented from being ionized, an additional hardware structure is not needed to be added, the anti-rust effect can be achieved, the cost of the electric heating device is low, and the anti-rust effect is reliable.
Example eight:
an embodiment of the present invention provides a readable storage medium, on which a program is stored, which when executed by a processor implements the control method of the electric heating apparatus as in any one of the above embodiments, thereby having all the advantageous technical effects of the control method of the electric heating apparatus as in any one of the above embodiments.
The readable storage medium is, for example, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps, after comprehending the spirit of the present invention.
It should also be noted that the exemplary embodiments noted in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed at the same time.
In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are used broadly and should be construed to include, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the description of the present specification, the description of "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to 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.
Claims (15)
1. An electrical heating circuit, comprising:
a controller;
the first end of the sensor is connected with the controller;
the first end of the electric heating element is connected with the controller, and the second end of the electric heating element is connected with the second end of the sensor;
the first end of the sampling circuit is connected with the controller, the second end of the sampling circuit is connected with the second end of the sensor, and the third end of the sampling circuit is connected with the second end of the electric heating element;
the controller alternately outputs voltage signals to the sensor and the electrothermal element;
the sensor is a probe type liquid level sensor.
2. The electric heating circuit of claim 1, further comprising:
and the first end of the filter circuit is connected with the second end of the sampling circuit, and the second end of the filter circuit is connected with the third end of the sampling circuit.
3. The electro-thermal circuit of claim 2, wherein the filter circuit comprises:
a first capacitive element, a first end of the first capacitive element being connected to a second end of the sampling circuit, a second end of the first capacitive element being connected to ground;
and a first end of the second capacitive element is connected with a third end of the sampling circuit, and the second capacitive element is grounded.
4. The electric heating circuit of claim 3, wherein the filter circuit comprises:
a first resistive element, a first end of the first resistive element being connected to a first end of the first capacitive element, a second end of the first resistive element being connected to a second end of the sensor;
and a first end of the second resistive element is connected with a second end of the second capacitive element, and a second end of the second resistive element is connected with a second end of the electrothermal element.
5. The electric heating circuit according to any one of claims 1 to 4, further comprising:
a third resistive element, a first end of the third resistive element being connected to the controller, a second end of the third resistive element being connected to the first end of the sensor;
a fourth resistive element, a first end of the fourth resistive element being coupled to the controller, a second end of the fourth resistive element being coupled to the first end of the electrical heating element.
6. An electric heating device, comprising:
the device comprises a shell, a first accommodating cavity and a second accommodating cavity, wherein the first accommodating cavity is formed in the shell;
the electric heating circuit of any one of claims 1 to 5, disposed in the housing, wherein a sensor of the electric heating circuit is located in the first accommodating cavity.
7. The electric heating apparatus of claim 6,
the sensor is a probe type liquid level sensor.
8. A cooking appliance, comprising:
the shell is internally provided with a second accommodating cavity;
the electric heating device of claim 6, disposed in the housing, the heating device being configured to generate steam;
and the steam pipeline is arranged in the shell, two ends of the steam pipeline are respectively connected with the second accommodating cavity and the electric heating device, and the steam pipeline is used for conveying the steam generated by the electric heating device to the second accommodating cavity.
9. The cooking appliance of claim 8,
the cooking appliance comprises a steam box, a steam oven and a micro-steaming and baking integrated machine.
10. A control method of an electric heating apparatus for the electric heating apparatus according to claim 6, comprising:
alternately outputting a voltage signal to the sensor and the electrocaloric element;
and acquiring a liquid level signal through the sampling circuit, and determining the liquid level state in the first accommodating cavity according to the liquid level signal.
11. The method for controlling an electric heating device according to claim 10, wherein the step of alternately outputting the voltage signals to the sensor and the electric heating element comprises:
outputting a first voltage signal to a first end of the sensor, and outputting a second voltage signal to a second end of the electrothermal element until a first set time length is reached;
and outputting a first voltage signal to the first end of the electric heating element, outputting a second voltage signal to the first end of the sensor until a second set time length is reached, and returning to execute the step of outputting the voltage signal to the first end of the sensor.
12. The control method of an electric heating apparatus according to claim 11,
the voltage value of the first voltage signal is greater than the voltage value of the second voltage signal.
13. The method for controlling an electric heating device according to any one of claims 10 to 12, wherein the step of obtaining the liquid level signal by the sampling circuit specifically comprises:
acquiring a first liquid level signal through a second end of the sampling circuit based on outputting a voltage signal to the sensor;
and acquiring a second liquid level signal through a third end of the sampling circuit based on the voltage signal output to the electric heating element.
14. The method of claim 13, wherein the step of determining the liquid level state in the first receiving chamber according to the liquid level signal comprises:
acquiring a first set liquid level signal and a second set liquid level signal;
and determining the liquid level state in the first accommodating cavity according to the comparison result of the first liquid level signal and the first set liquid level signal and/or the comparison result of the second liquid level signal and the second set liquid level signal.
15. A readable storage medium, characterized in that it has stored thereon a program or instructions which, when executed by a processor, implement the steps of a control method of an electric heating device according to any one of claims 10 to 14.
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