CN115308265A

CN115308265A - Liquid state detection method and microwave device

Info

Publication number: CN115308265A
Application number: CN202211049553.7A
Authority: CN
Inventors: 官继红; 杨鹏; 王帅
Original assignee: Shenzhen Megmeet Electrical Co Ltd
Current assignee: Shenzhen Megmeet Electrical Co Ltd
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2022-11-08

Abstract

The application discloses a liquid state detection method and a microwave device. In the voltage signal, a first voltage and a second voltage which are adjacent to each other are obtained. The state of the liquid is determined based on a difference between the first voltage and the second voltage. Through the mode, the state of the liquid can be acquired, and the liquid can be heated more accurately.

Description

Liquid state detection method and microwave device

Technical Field

The present disclosure relates to the field of microwave technology, and more particularly, to a liquid state detection method and a microwave apparatus.

Background

A microwave oven is a device for heating food by generating microwave using electric current and irradiating the microwave to the food, and can simultaneously heat the surface and the inside of the food, thereby rapidly cooking various foods.

At present, in the process of heating liquid by using a microwave oven, a common scheme is to set a heating time, and complete the heating of the liquid within the set heating time.

However, this time-based approach is affected by the initial temperature and weight of the liquid, and does not allow for accurate heating.

Disclosure of Invention

The application aims to provide a liquid state detection method and a microwave device, which can obtain the state of liquid so as to realize more accurate heating of the liquid.

In order to achieve the above object, in a first aspect, the present application provides a liquid state detection method applied to a microwave apparatus, the method including:

acquiring a voltage signal corresponding to the field intensity of the microwave signal output by the microwave device;

acquiring adjacent first voltage and second voltage in the voltage signal;

determining a state of the liquid based on a difference between the first voltage and the second voltage.

In an optional manner, the obtaining adjacent first voltage and second voltage in the voltage signal includes:

collecting the voltage signal once every first time interval to determine a sub-voltage;

determining a voltage according to the collected sub-voltages within each second time period, wherein the second time period is longer than the first time period;

determining at least two voltages based on the at least two second durations;

and in the at least two voltages, any two adjacent voltages are respectively used as the first voltage and the second voltage.

In an alternative, the determining a voltage according to the collected sub-voltages includes:

determining a voltage according to the maximum value of the collected sub-voltages, or determining a voltage according to the effective value of the collected sub-voltages, or determining a voltage according to the average value of the collected sub-voltages.

In an alternative form, the determining the state of the liquid based on the difference between the first voltage and the second voltage includes:

when the ratio of the absolute value of the difference to the first voltage is greater than a first preset threshold, determining that the liquid is in a first state;

and when the ratio is not greater than the first preset threshold, determining that the liquid is in a second state.

when the absolute value of the difference is larger than a second preset threshold, determining that the liquid is in a first state;

and when the absolute value of the difference is not larger than the second preset threshold, determining that the liquid is in a second state.

In a second aspect, the present application provides a liquid state detection device comprising:

the first acquisition unit is used for acquiring a voltage signal corresponding to the field intensity of the microwave signal output by the microwave device;

the second acquisition unit is used for acquiring adjacent first voltage and second voltage in the voltage signal;

a first determination unit for determining a state of the liquid according to a difference between the first voltage and the second voltage.

In a third aspect, the present application provides a microwave apparatus comprising:

the magnetron is used for outputting a microwave signal;

a control module for processing the voltage signal corresponding to the field intensity of the microwave signal, the control module comprising:

at least one processor and a memory communicatively coupled to the at least one processor, the memory storing instructions executable by the at least one processor to enable the at least one processor to perform a method as described above.

In an optional manner, the microwave apparatus further includes a cavity, a substrate, and a microwave detection module;

the outer surface of the furnace chamber is provided with at least one through hole, the base plate is arranged on the outer surface of the furnace chamber, and at least part of the through hole is covered by the base plate;

at least part of the microwave detection module and the control module are arranged on the substrate and electrically connected, and the microwave detection module is used for acquiring a microwave signal output by the microwave device, acquiring a voltage signal corresponding to the field intensity of the microwave signal and transmitting the voltage signal to the control module.

In an alternative form, the microwave detection module includes:

the detection branch circuit is used for acquiring the microwave signal and outputting a first alternating current signal according to the microwave signal;

the rectifying branch is connected with the detection branch and used for rectifying the first alternating current signal to output a first direct current signal;

and the energy storage branch is connected with the rectifying branch and used for storing energy according to the first direct current signal so as to obtain the voltage signal.

In a fourth aspect, the present application provides a non-transitory computer-readable storage medium having stored thereon computer-executable instructions that, when executed by a processor, cause the processor to perform a method as described above.

The beneficial effect of this application is: the liquid state detection method is applied to a microwave device, and the microwave device is used for heating liquid. When the microwave device heats the liquid, voltage signals corresponding to the field intensity of the microwave signals output by the microwave device are obtained, and adjacent first voltage and second voltage are obtained from the obtained voltage signals. When the state of the liquid changes, the voltage signal changes along with the change, and the change condition of the voltage signal can be reflected through the difference between the first voltage and the second voltage, so that the current state of the liquid can be determined through the difference between the first voltage and the second voltage. Then, the microwave device can adjust the heating temperature of the liquid in real time according to the current state of the liquid. Compared with a time-based mode in the related art, the liquid heating device can achieve more accurate heating of liquid.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

Fig. 1 is a schematic structural diagram of a microwave apparatus according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a microwave detection module according to an embodiment of the present application;

fig. 3 is a schematic circuit structure diagram of a microwave detection module according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a control module according to an embodiment of the present application;

FIG. 5 is a flow chart of a method for detecting a liquid state according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram illustrating one implementation of step 502 shown in FIG. 5, provided in an embodiment of the present application;

FIG. 7 is a schematic diagram illustrating an implementation of step 503 shown in FIG. 5, provided in an embodiment of the present application;

FIG. 8 is a schematic diagram of a voltage signal of a liquid in a first state according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a voltage signal of a liquid in a second state according to an embodiment of the present disclosure;

FIG. 10 is a schematic diagram of another implementation of step 503 shown in FIG. 5, provided in an embodiment of the present application;

fig. 11 is a schematic structural diagram of a liquid state detection device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. 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 application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a microwave device according to an embodiment of the present disclosure. As shown in fig. 1, the microwave apparatus 100 includes a control module 101 and a magnetron (not shown). Wherein, the magnetron is used for outputting microwave signals.

In one embodiment, the microwave apparatus 100 further comprises a cavity 102, a substrate 103 and a microwave detection module (not shown).

The magnetron may be disposed inside the cavity 102, and then, if a container containing liquid is disposed inside the cavity 102, the microwave signal inside the cavity 102 may have different field strengths when the liquid state is different. For example, the state of the liquid includes an unboiled state and a boiled state, in which the field strength of the microwave signal inside the cavity 102 is different.

At least one through hole 104 is formed on an outer surface of the cavity 102, wherein the number and shape of the through holes 104 may be set according to practical applications, which is not particularly limited in the embodiments of the present application. For example, in this embodiment, a total of 6 through holes 104 are provided, each through hole 104 is exemplified by a circular hole, while in other embodiments, other numbers of through holes 104 may be provided, such as 8, and the like, and the through holes 104 may have other shapes, such as a square, and the like. The microwave signal generated inside the cavity 102 can leak out through the through hole 104. In addition, the through hole 104 may be disposed on any outer surface of the cavity 102, for example, the through hole 104 may be disposed on an outer surface of a left side of the cavity 102, unlike the embodiment shown in fig. 1, which is not particularly limited in the embodiments of the present application.

At least a part of at least one through hole 104 is covered by the substrate 103, that is, the substrate 103 may only cover part of the through hole 104, and may also cover all of the through holes 104. Therefore, the microwave detection module disposed on the substrate 103 disposed on the outer surface of the cavity 102 can detect the field intensity of the microwave signal leaking from the through hole 104. At least part of the microwave detection module is disposed on the substrate 103, that is, the microwave detection module may be partially disposed on the substrate 103 or may be entirely disposed on the substrate 103.

It should be noted that fig. 1 is only an exemplary structure illustrating the microwave apparatus 100, and in other embodiments, the microwave apparatus 100 may also have other structures, which are not specifically limited by the embodiments of the present application. For example, in an embodiment, an outer casing is further disposed outside the cavity 102, and the outer casing may cover the cavity 102, in which case, the through hole 104 is still disposed on the outer surface of the cavity 102, and the control module 101 and the substrate 103 are disposed between the outer surface of the cavity 102 and the outer casing, in other words, the substrate 101 and the microwave detection circuit disposed on the substrate 101 are both disposed outside the cavity 102 and inside the outer casing. Therefore, the detection process of the microwave signal can be realized, and the substrate 101, and the microwave detection module and the control module 101 which are arranged on the substrate 101 can be protected through the shell.

Referring to fig. 2, fig. 2 illustrates an example of a structure of a microwave detection module. As shown in fig. 2, the microwave detection module 105 includes a detection branch 1051, a rectification branch 1052, and a power storage branch 1053. The rectifying branch 1052 is connected to the detecting branch 1051 and the energy storing branch 1053, respectively.

Specifically, the detection branch 1051 is configured to obtain a microwave signal and output a first ac signal according to the microwave signal. The rectifying branch 1052 is used for rectifying the first ac signal to output a first dc signal. The energy storage branch 1053 is configured to store energy according to the first dc signal to obtain a voltage signal corresponding to the field strength of the microwave signal output by the microwave apparatus.

In practical applications, a magnetron in the microwave apparatus 100 outputs a microwave signal when the microwave apparatus 100 is in operation. In turn, the detection branch 1051 is capable of receiving a microwave signal and generating a first ac signal corresponding to the microwave signal. Then, the first ac signal is rectified by the rectifying branch 1052, and then the first dc signal can be output. The first dc signal can charge the energy storage branch 1053, so that the energy storage branch 1053 stores energy, and thus voltage signals corresponding to the field intensity of the microwave signal are generated at two ends of the energy storage branch 1053.

In one embodiment, as shown in fig. 3, the detecting branch 1051 includes an antenna ANT1 and a first resistor R1. The first end of the antenna ANT1 is connected to the first end of the first resistor R1 and the rectifying branch 1052, and the second end of the antenna ANT1 and the second end of the first resistor R1 are all grounded GND.

Specifically, the antenna ANT1 is configured to receive a microwave signal and generate a first ac signal. The first resistor R1 is used to provide impedance matched with the antenna ANT1 to obtain greater output power, which is beneficial to make the detection result more accurate.

In one embodiment, the antenna ANT1 comprises a copper wire with a length of 1/4 of the wavelength of the microwave signal for better detection of the microwave signal output by the microwave device. For example, in one embodiment, the wavelength of the microwave signal is 12 mm, and the antenna ANT1 includes a copper wire with a length of 3 mm.

In one embodiment, rectifying branch 1052 includes a first diode D1. An anode of the first diode D1 is connected to a first end of the first resistor R1, and a cathode of the first diode D1 is connected to the energy storage branch 1053.

Specifically, since the first diode D1 has unidirectional conductivity, the first diode D1 may be used to rectify the first ac signal into the first dc signal.

In one embodiment, the rectifying branch 1052 further includes a second resistor R2. The first end of the second resistor R2 is connected to the first end of the first resistor R1, and the second end of the second resistor R2 is connected to the anode of the first diode D1.

In this embodiment, the second resistor R2 is used as a current limiting resistor to prevent the first diode D1 from being damaged due to overload caused by an excessive surge signal, which is beneficial to protecting the first diode D1.

In one embodiment, the energy storage branch 1053 includes a first capacitor C1 and a third resistor R3. The first end of the first capacitor C1 is connected to the cathode of the first diode D1, the second end of the first capacitor C1 is grounded GND, and the first capacitor C1 is connected in parallel to the third resistor R3.

In particular, the first capacitor C1 can be charged by a first direct current signal to generate a voltage signal across it corresponding to the field strength of the microwave signal. Meanwhile, the first capacitor C1 may also be used as a filter capacitor to filter out high-frequency pulses that may exist in the first dc signal, so as to obtain a smooth voltage signal, which is a low-frequency dc signal. The third resistor R3 is used to provide a bleeding branch, so that when the first capacitor C1 needs to discharge, the stored electric quantity can be bled through the third resistor R3. The voltage signal can be output through the interfaces S1 and S2.

Referring back to fig. 1, the microwave detection module is electrically connected to the control module 101 disposed on the substrate 103, and after acquiring the microwave signal, the microwave detection module obtains a voltage signal corresponding to the field intensity of the microwave signal according to the microwave signal, and transmits the voltage signal to the control module 101. Taking the circuit structure shown in fig. 3 as an example, the voltage signal is input to the control module 101 through the interface S1 and the interface S2. Then, the control module 101 can process the voltage signal corresponding to the field intensity of the microwave signal to execute the liquid state detection method in any embodiment of the present application.

The control module 101 may be a Micro Control Unit (MCU) or a Digital Signal Processing (DSP) controller.

Referring to fig. 4, fig. 4 illustrates an example of a structure of the control module 101. As shown in fig. 4, the control module 101 includes at least one processor 1011; and a memory 1012 communicatively coupled to the at least one processor 1011, which is illustrated in fig. 4 as one processor 1011.

The memory 1012 stores instructions executable by the at least one processor 1011 for causing the at least one processor 1011 to perform a fluid condition detection method according to any of the embodiments of the present application. The processor 1011 and the memory 1012 may be connected by a bus or other means, such as the bus shown in FIG. 4.

The memory 1012, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions/modules corresponding to the liquid state detection method in the embodiments of the present application. The processor 1011 executes various functional applications of the server and data processing by executing nonvolatile software programs, instructions and modules stored in the memory 1012, that is, implements the liquid state detection method in any embodiment of the present application.

The memory 1012 may include a program storage area that may store an operating system, an application program required for at least one function, and a data storage area; the storage data area may store data created according to use of the data transmission apparatus, and the like. Further, the memory 1012 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory 1012 may optionally include memory located remotely from the processor 1011, which may be connected to a data transmission device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

One or more modules are stored in the memory 1012 that, when executed by the one or more processors 1011, perform the liquid condition detection method of any of the method embodiments of the present application.

The product can execute the liquid state detection method provided by the embodiment of the application, and has the corresponding functional modules and beneficial effects of the execution method. For details of the liquid state detection method provided in the embodiments of the present application, reference may be made to the following description.

Referring to fig. 5, fig. 5 is a flowchart of a liquid state detection method according to an embodiment of the present disclosure. The method is applied to a microwave apparatus, and here, the structure of the microwave apparatus may refer to the above detailed description for fig. 1, which is not described herein again. As shown in fig. 5, the liquid state detection method includes the steps of:

step 501: and acquiring a voltage signal corresponding to the field intensity of the microwave signal output by the microwave device.

It can be seen from the above embodiments that when a container containing a liquid is placed in a cavity of a microwave device, the different states of the liquid cause different field strengths of the microwave signal inside the cavity. In order to identify the field intensity of the microwave signal, the field intensity of the microwave signal can be converted into a corresponding voltage signal, wherein the voltage signal and the field intensity of the microwave signal present a positive correlation relationship, and the change condition of the field intensity of the microwave signal can be determined by acquiring the voltage signal, so that the state of the liquid can be determined.

Step 502: in the voltage signal, a first voltage and a second voltage which are adjacent to each other are obtained.

By comparing two adjacent voltages in the voltage signal, the actual change condition of the voltage signal can be determined.

In an embodiment, as shown in fig. 6, the process of obtaining adjacent first voltage and second voltage in the voltage signal in step 502 includes the following steps:

step 601: the voltage signal is collected once every first interval to determine a sub-voltage.

The first duration is a period for collecting the voltage, and the first duration may be set according to actual requirements, which is not specifically limited in the embodiment of the present application. For example, in one embodiment, the first duration may be set to a smaller value to collect more voltage, so as to improve the accuracy, e.g., the first duration may be set to 500 μ S, i.e., the voltage is collected every 500 μ S and recorded as one sub-voltage.

Step 602: and determining a voltage according to the collected sub-voltages in each second time period.

Step 603: at least two voltages are determined based on the at least two second durations.

Step 604: of the at least two voltages, any two adjacent voltages are respectively used as a first voltage and a second voltage.

Wherein the second duration is greater than the first duration.

The second time period is a period for calculating the voltage, the second time period includes a plurality of first time periods, that is, a plurality of sub-voltages can be collected in each second time period, and a voltage can be determined by calculating according to the plurality of sub-voltages (the voltage is a calculation result). Then, over at least two second time periods, at least two voltages can be determined. Similarly, the second duration may be set according to the requirement, which is not specifically limited in this application, and only needs to be longer than the first duration, that is, there are multiple sub-voltages within the second duration.

In the embodiment, by combining a plurality of sub-voltages to determine one voltage, the abnormal situation of wrong judgment of the liquid state caused by sampling errors can be reduced, so that the accuracy of liquid state detection is improved, and the detection result is more reliable.

In some embodiments, the step 602 of determining a voltage from the collected sub-voltages comprises the steps of: determining a voltage according to the maximum value of the collected sub-voltages, or determining a voltage according to the effective value of the collected sub-voltages, or determining a voltage according to the average value of the collected sub-voltages.

Specifically, the first way is to compare the magnitudes of a plurality of sub-voltages within the second time period, and take the maximum value as the determined voltage; the second way is to calculate the effective value from the maximum value after determining the maximum value, and take the effective value as the determined voltage; a third way is to calculate an average value of a plurality of sub-voltages within the second period of time and take the average value as the determined voltage. It is understood that this embodiment only illustrates three ways of determining the voltage through the sub-voltage, and in other embodiments, other ways may be adopted, for example, a maximum value is amplified by several times to be used as the determined voltage, and this is not specifically limited by the embodiment of the present application.

Further, after at least two voltages are determined, any two adjacent voltages may be used as the first voltage and the second voltage.

Take the first time period of 500 mus, the second time period of 10mS, and determine a voltage according to the maximum value among the collected sub-voltages as an example. The voltage was collected every 500 μ S, one sub-voltage was obtained, and a total of 20 sub-voltages were obtained for each 10 mS. At the first 10mS, the maximum of the 20 sub-voltages is taken as the first voltage (noted as V1); in the second 10mS, the maximum value of the 20 sub-voltages is regarded as the second voltage (denoted as V2) … … and in the Nth 10mS, and the maximum value of the 20 sub-voltages is regarded as the Nth voltage (denoted as VN), N is an integer larger than or equal to 2. Then, if V1 is set as the first voltage, V2 is set as the second voltage; if V2 is the first voltage, V3 is the second voltage … …, and so on, it is only necessary to keep the first voltage and the second voltage as adjacent voltages.

Step 503: the state of the liquid is determined based on a difference between the first voltage and the second voltage.

It can be seen from the above embodiments that when the state of the liquid changes, the field strength of the microwave signal inside the cavity of the microwave apparatus changes, which results in a change of the voltage signal. The change of the voltage signal can be represented by the difference between the adjacent first voltage and the second voltage, in other words, the current state of the liquid can be determined by the difference between the first voltage and the second voltage.

For example, in practical applications, when the liquid is in an unboiled state, the microwave signal changes regularly and smoothly; when the liquid is in a boiling state, a large amount of bubbles are generated, the impedance of the whole microwave system is changed rapidly, and the microwave signal is also changed dramatically. Therefore, whether the liquid is in the boiling state can be judged by detecting the change of the field intensity of the microwave signal, namely whether the liquid is in the boiling state can be judged by detecting the change of the voltage signal.

In one embodiment, as shown in fig. 7, the process of determining the state of the liquid according to the difference between the first voltage and the second voltage in step 503 includes the following steps:

step 701: and when the ratio of the absolute value of the difference to the first voltage is greater than a first preset threshold, determining that the liquid is in a first state.

Step 702: and when the ratio of the absolute value of the difference to the first voltage is not greater than a first preset threshold, determining that the liquid is in a second state.

The first preset threshold may be set according to an actual application, and the embodiment of the present application does not specifically limit this. For example, the first preset threshold may be determined according to the actual type of liquid. The ratio of the absolute value of the difference to the first voltage refers to a percentage change, that is, a percentage change from the first voltage to the second voltage, where the first voltage appears before the second voltage, that is, the percentage change between the first voltage (denoted as Va) and the second voltage (denoted as Vb) is: | Vb-Va | Va.

Referring to fig. 8 and 9, fig. 8 and 9 are diagrams illustrating the relationship between the state of water and the voltage signal when a container filled with liquid (water in this embodiment) is placed in the cavity of the microwave device.

Fig. 8 shows a relationship between the state of water and the voltage signal when the water is not boiling, where a curve L1 is the voltage signal when the water is not boiling, and a curve L11 is a part of the curve L1. As shown in FIG. 8, when the water in the vessel is not boiling, the maximum value is about 264mV at 10-20mS, about 264mV at 20mS-30mS, and about 254mV … … at 30mS-40mS, it can be seen that the percent change between any two adjacent maximum values remains less than 20%, exemplified by 264mV for the first voltage and 254mV for the second voltage, i.e., 264-254 |/264 ≈ 4% < 20%.

Fig. 9 shows the relationship between the state of water and the voltage signal when the water boils, where a curve L2 is the voltage signal when the water boils and a curve L21 is a part of the curve L2. As shown in fig. 9, when the water in the container boils, the maximum value is about 150mV at 20-30mS, and the maximum value is about 60mV … … at 30mS-40mS, it can be seen that the percent change between any two adjacent maximum values remains greater than or equal to 60%, such as 150mV for the first voltage and 60mV for the second voltage, and 150-60/150 =60%.

In this embodiment, only the maximum value is taken as an example for explanation, and similar results can be obtained for the effective value or the average value for the same reason, which is within the range easily understood by those skilled in the art, and thus, the description is omitted here.

In the embodiment, whether the water is in the boiling state or not can be accurately judged by determining one voltage every 10 mS. Therefore, in a preferred embodiment, the second duration may be set to 10mS to improve the accuracy of the test.

In addition, also for more accurate determination of whether the water is in the boiling state, the first preset threshold may be set to any value of [20%,60% ], for example, the first preset threshold may be set to a median value of 20% and 60%, i.e. 40%. Thus, when it is determined that the ratio of the absolute value of the difference between the first voltage and the second voltage to the first voltage is less than or equal to 20%, it is determined that the water is in the non-boiling state (corresponding to the first state); when it is determined that the ratio of the absolute value of the difference between the first voltage and the second voltage to the first voltage is greater than 20%, it is determined that the water is in the boiling state (corresponding to the second state).

Furthermore, after determining the state of the liquid, the microwave device can adjust the heating temperature of the liquid in real time according to the current state of the liquid. Therefore, the mode provided by the embodiment of the application is not influenced by the initial temperature and the weight of the liquid as the time-based mode in the related art, so that the liquid can be heated more accurately.

Taking the automatic soup cooking as an example, the soup is boiled by strong fire at first, then the soup is switched to a slow fire mode to maintain the boiling state, and the whole cooking process is completed after a period of time. In this case, if the related art is adopted, since only the heating time is controlled, the hot state is maintained after the soup is boiled, the cooking effect is poor, and the taste of the food material is also poor. And if adopt the technical scheme that this application embodiment provided, the boiling state that can accurately discern to shift into the small fire state in advance or lag, the effect of cooking is better, and the taste of food material is also better.

It can be understood that, in practical application, the measured voltage signal has different magnitude according to the water amount in the cavity of the microwave device, but since the embodiment adopts the variation percentage, the embodiment can be applied to various application scenarios with different water amounts, and has strong practicability.

Of course, if the amount of water is determined, the voltage signal can be directly used to determine the state of the liquid for convenience. For example, in one embodiment, as shown in fig. 10, the process of determining the state of the liquid according to the difference between the first voltage and the second voltage in step 503 includes the following steps:

step 1001: and when the absolute value of the difference is larger than a second preset threshold value, determining that the liquid is in the first state.

Step 1002: and when the absolute value of the difference is not larger than a second preset threshold value, determining that the liquid is in a second state.

The second preset threshold may be set according to an actual application, and this is not specifically limited in the embodiment of the present application. For example, the second preset threshold may be determined according to the actual type of liquid.

In practical applications, when the container containing a certain amount of water is placed in the oven cavity of the microwave device, the maximum value change per 10mS is detected to be within 100mV when the water in the container is not boiling, i.e. the absolute value of the difference between the first voltage and the second voltage is kept less than 100mV; when the water boils, the microwave absorption characteristic changes, with a maximum value of more than 300mV per 10mS, i.e. the absolute value of the difference between the first voltage and the second voltage remains greater than 100mV.

Further, the first preset threshold value may be set to any one of [100mv,300mv ], and the state of the liquid can be also accurately determined. For example, the first preset threshold may be set to the median of 100mV and 300mV, i.e., 200mV. Thus, when it is determined that the absolute value of the difference between the first voltage and the second voltage is less than or equal to 200mV, it is determined that water is in an unboiled state (corresponding to the first state); when it is determined that the absolute value of the difference between the first voltage and the second voltage is greater than 200mV, it is determined that the water is in the boiling state (corresponding to the second state).

Referring to fig. 11, which shows a schematic structural diagram of a liquid state detection device provided in an embodiment of the present application, a liquid state detection device 1100 includes: a first acquisition unit 1101, a second acquisition unit 1102 and a first determination unit 1103.

The first obtaining unit 1001 is configured to obtain a voltage signal corresponding to a field intensity of a microwave signal output by a microwave apparatus. The second obtaining unit 1102 is configured to obtain adjacent first voltage and second voltage in the voltage signal. The first determining unit 1103 is configured to determine a state of the liquid according to a difference between the first voltage and the second voltage.

The product can execute the method provided by the embodiment of the application shown in fig. 5, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the methods provided in the embodiments of the present application.

Embodiments of the present application also provide a non-transitory computer-readable storage medium, which stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the processor is caused to execute the liquid state detection method in any one of the above embodiments.

Embodiments of the present application further provide a computer program product, the computer program product includes a computer program stored on a computer-readable storage medium, the computer program includes program instructions, when the program instructions are executed by a computer, the computer executes the liquid state detection method in any of the above embodiments.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; within the context of the present application, where technical features in the above embodiments or in different embodiments can also be combined, the steps can be implemented in any order and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A liquid state detection method is applied to a microwave device, and the method comprises the following steps:

acquiring adjacent first voltage and second voltage in the voltage signal;

2. The method of claim 1, wherein obtaining adjacent first and second voltages in the voltage signal comprises:

determining at least two voltages based on the at least two second durations;

3. The method of claim 2, wherein determining a voltage based on the collected sub-voltages comprises:

4. The method of claim 1, wherein determining the state of the liquid from the difference between the first voltage and the second voltage comprises:

and when the ratio is not larger than the first preset threshold, determining that the liquid is in a second state.

5. The method of claim 1, wherein determining the state of the liquid from the difference between the first voltage and the second voltage comprises:

6. A liquid state detection device, comprising:

7. A microwave device, comprising:

the magnetron is used for outputting a microwave signal;

a control module, configured to process a voltage signal corresponding to a field intensity of the microwave signal, where the control module includes:

at least one processor and a memory communicatively coupled to the at least one processor, the memory storing instructions executable by the at least one processor to enable the at least one processor to perform the method of any of claims 1-5.

8. The microwave device of claim 7, further comprising a cavity, a base plate, and a microwave detection module;

9. The microwave device of claim 8, wherein the microwave detection module comprises:

10. A non-transitory computer-readable storage medium storing computer-executable instructions that, when executed by a processor, cause the processor to perform the method of any one of claims 1-5.