CN106211408B - Control method of microwave oven and microwave oven - Google Patents
Control method of microwave oven and microwave oven Download PDFInfo
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- CN106211408B CN106211408B CN201610514943.5A CN201610514943A CN106211408B CN 106211408 B CN106211408 B CN 106211408B CN 201610514943 A CN201610514943 A CN 201610514943A CN 106211408 B CN106211408 B CN 106211408B
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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
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/66—Circuits
- H05B6/68—Circuits for monitoring or control
- H05B6/687—Circuits for monitoring or control for cooking
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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- Electromagnetism (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
Abstract
The invention discloses a control method of a microwave oven, which is used for detecting whether the microwave oven is in an idle state or not, and comprises the following steps: a detection step of detecting the current resonant frequency of the primary side of the high-voltage transformer in a set time period; a judging step, namely comparing the current resonance frequency with the set resonance frequency to judge whether the microwave oven is in an idle state, and judging that the microwave oven is in the idle state if the current resonance frequency is higher than the set range of the set resonance frequency; and a control step of stopping the power output of the microwave oven or reducing the operating power of the microwave oven when the microwave oven is in an idle state. The control method of the microwave oven of the embodiment of the invention can accurately and quickly judge whether the microwave oven is in the no-load state or not by detecting the change of the resonant frequency, and carry out corresponding power control, thereby avoiding the over-quick aging or damage of the magnetron, and the method is simple to realize and has lower cost. The invention also discloses a microwave oven.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a control method of a microwave oven in an idle state and the microwave oven.
Background
With the rapid development of power electronic devices and the continuous maturity of frequency conversion technology, the frequency conversion technology is applied to microwave ovens. The frequency conversion microwave oven has the characteristics of light body, low noise and electricity saving. Like other household appliances, the variable frequency microwave oven has a load state and an idle state, and when the variable frequency microwave oven works in the idle state at a rated power for a long time, the magnetron is easily aged or damaged too fast, and even a series of potential safety hazards are brought.
Currently, the idle load or abnormal state of the variable frequency microwave oven is generally judged by detecting the anode current. The method is based on the principle that the temperature of a magnetic field of a magnetron is rapidly increased when the magnetron is in no load, the threshold voltage of the magnetron oscillation is reduced, and the anode current is rapidly increased, and the judgment is carried out according to the slope change of the anode current. However, this method requires additional current sampling devices and circuits, and also has the problems of high potential difference, sufficient isolation, increased cost, increased size of the frequency converter, and the like.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the present invention is directed to a method for controlling a microwave oven in an unloaded state of the microwave oven and a microwave oven.
The control method of the microwave oven of the embodiment of the invention is used for detecting whether the microwave oven is in an idle state or not, and comprises the following steps:
a detection step of detecting a current resonance frequency of a primary side of the high voltage transformer within a set time period;
a judging step, wherein the judging step compares the current resonance frequency with a set resonance frequency to judge whether the microwave oven is in an idle state, and if the current resonance frequency is higher than the set range of the set resonance frequency, the microwave oven is judged to be in the idle state; and
a control step of stopping power output of the microwave oven or reducing operation power of the microwave oven when the microwave oven is in an idle state.
The control method of the microwave oven of the embodiment of the invention can accurately and quickly judge whether the microwave oven is in the no-load state or not by detecting the change of the resonant frequency of the primary side of the high-voltage transformer and carry out corresponding power control, thereby avoiding the over-quick aging or damage of the magnetron, and having simple realization and lower cost.
In certain embodiments, the detecting step specifically comprises:
detecting a driving pulse width of a primary side of the high-voltage transformer in the set time period;
and acquiring the current resonant frequency according to the driving pulse width.
In certain embodiments, the detecting step specifically comprises:
detecting a resonance period of a primary side of the high voltage transformer within the set time period;
and acquiring the current resonance frequency according to the resonance period.
In certain embodiments, the detecting step specifically comprises:
detecting the resonance times of the primary side of the high-voltage transformer in the set time period;
and acquiring the current resonance frequency according to the resonance times.
In some embodiments, the set time period is a mains cycle.
In certain embodiments, the controlling step further comprises:
and controlling the microwave oven to display an error code when the microwave oven is in an idle state and the power output of the microwave oven is stopped.
The microwave oven of the embodiment of the invention comprises:
the detection module is used for detecting the current resonant frequency of the primary side of the high-voltage transformer in a set time period;
the judging module is used for comparing the current resonance frequency with a set resonance frequency to judge whether the microwave oven is in an idle state, and if the current resonance frequency is higher than the set range of the set resonance frequency, judging that the microwave oven is in the idle state; and
a control module stopping power output of the microwave oven or reducing operation power of the microwave oven when the microwave oven is in an idle state.
In certain embodiments, the detection module comprises:
a first resistor, one end of the first resistor being connected to one end of the resonant capacitor,
one end of the second resistor is connected with the other end of the first resistor, the other end of the second resistor is grounded, and a first node is arranged between the first resistor and the second resistor;
a third resistor having one end connected to the other end of the resonant capacitor, an
And one end of the fourth resistor is connected with the other end of the third resistor, the other end of the fourth resistor is grounded, and a second node is arranged between the third resistor and the fourth resistor.
In certain embodiments, the detection module comprises:
a driving pulse width detection module for detecting a driving pulse width of a primary side of the high voltage transformer within the set period of time,
the detection module is used for obtaining the current resonant frequency according to the driving pulse width.
In certain embodiments, the detection module comprises:
a resonance period detection module for detecting a resonance period of a primary side of the high voltage transformer within the set time period;
the detection module is used for acquiring the current resonance frequency according to the resonance period.
In certain embodiments, the detection module comprises:
the resonance frequency detection module is used for detecting the resonance frequency of the primary side of the high-voltage transformer in the set time period;
the detection module is used for acquiring the current resonance frequency according to the resonance frequency.
In some embodiments, the microwave oven includes a display module, and the control module is configured to control the display module to display an error code when the microwave oven is in an unloaded state and the power output of the microwave oven is stopped.
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 is a flow chart illustrating a control method of a microwave oven according to an embodiment of the present invention.
Fig. 2 is a functional block diagram of a microwave oven according to an embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of a microwave oven according to an embodiment of the present invention.
Fig. 4 is a schematic view of another functional block of the microwave oven according to the embodiment of the present invention.
Fig. 5 is another flow chart illustrating a control method of a microwave oven according to an embodiment of the present invention.
Fig. 6 is another flowchart illustrating a method for controlling a microwave oven according to an embodiment of the present invention.
Fig. 7 is another flowchart illustrating a control method of a microwave oven according to an embodiment of the present invention.
Fig. 8 is still another flowchart of a control method of a microwave oven according to an embodiment of the present invention.
Description of the main element symbols:
the microwave oven comprises a microwave oven 10, a detection module 12, a driving pulse width detection module 122, a resonance period detection module 124, a resonance frequency detection module 126, a processor 128, a comparator 130, a counter 132, a timer 134, a judgment module 14, a control module 16, a display module 17, a first resistor R3, a second resistor R4, a third resistor R5 and a fourth resistor R6.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout.
The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Referring to fig. 1, a method for controlling a microwave oven according to an embodiment of the present invention is used to detect whether a microwave oven 10 is in an idle state, and the method for controlling the microwave oven includes the following steps:
a detection step S01 of detecting a current resonance frequency of the primary side of the high voltage transformer T1 within a set period of time at the detection step S01;
a determination step S02, wherein the determination step S02 compares the current resonance frequency with the set resonance frequency to determine whether the microwave oven 10 is in an unloaded state, and if the current resonance frequency is higher than the set range of the set resonance frequency, the microwave oven 10 is determined to be in an unloaded state; and
the control step S03, the control step S03 stops the power output of the microwave oven 10 or reduces the operation power of the microwave oven 10 when the microwave oven 10 is in the unloaded state.
Referring to fig. 2, a microwave oven 10 according to an embodiment of the present invention includes a detection module 12, a determination module 14, and a control module 16.
The control method of the microwave oven according to the embodiment of the present invention may be implemented by the microwave oven 10 according to the embodiment of the present invention, for example, the detecting step S01 may be implemented by the detecting module 12, the judging step S02 may be implemented by the judging module 14, and the controlling step S03 may be implemented by the controlling module 16.
That is, the detection module 12 may be used to detect the current resonant frequency of the primary side of the high voltage transformer T1 for a set period of time. The determining module 14 may be configured to compare the current resonant frequency with the set resonant frequency to determine whether the microwave oven 10 is in the idle state, and determine that the microwave oven 10 is in the idle state if the current resonant frequency is higher than the set range of the set resonant frequency. The control module 16 may be used to stop the power output of the microwave oven 10 or to reduce the operating power of the microwave oven 10 when the microwave oven 10 is in an unloaded state.
Therefore, whether the microwave oven 10 is in the no-load state or not can be accurately and quickly judged by detecting the change of the resonant frequency of the primary side of the high-voltage transformer T1, and corresponding power control is carried out, so that the phenomenon that the magnetron MGT is aged or damaged too fast is avoided, and the method is simple to implement and low in cost.
Referring to fig. 3, the detection module of the embodiment of the invention includes a first resistor R3, a second resistor R4, a third resistor R5, and a fourth resistor R6. One end of a first resistor R3 is connected with one end of a resonant capacitor C2, one end of a second resistor R4 is connected with the other end of the first resistor R3, the other end of the second resistor R4 is grounded, a first node J1 is arranged between the first resistor R3 and the second resistor R4, one end of a third resistor R5 is connected with the other end of a resonant capacitor C2, one end of a fourth resistor R6 is connected with the other end of the third resistor R5, the other end of the fourth resistor R6 is grounded, and a second node J2 is arranged between the third resistor R5 and the fourth resistor R6. The detection module 12 is used for detecting the current resonant frequency through the first node J1 and the second node J2.
Specifically, referring to fig. 4, the detection module 12 includes a processor 128 and a comparator 130. The processor 128 is used to read the current resonant frequency. The comparator 130 is used for comparing the voltage U1 of the first node J1 with the voltage U2 of the second node J2. When U1 ≧ U2, it is called synchronization, i.e., it indicates that one oscillation occurs within the resonance period. The detection module 12 also includes a counter 132. When the resonant frequency waveform of the third node J3 between the resonant capacitor C2 and the third resistor R5 rises from the lowest point to the highest point and then falls from the highest point to a value smaller than U1, which is called a synchronization period, the counter 132 counts the number of times of synchronization within a set time period, and obtains the current resonant frequency. The resonant capacitor C2 is a resonant capacitor C2 on the primary side of the transformer T1.
The processor 128 then reads the current resonant frequency value. The processor 128 reads the current resonant frequency, i.e., reads the current resonant frequency of the third node J3.
In the no-load state, the magnetic field temperature of the magnetron MGT rises, and the oscillation threshold voltage of the magnetron MGT falls. The voltage of the high voltage transformer T1 has a fixed voltage rising ratio, so the voltage of the primary side of the high voltage transformer T1 is correspondingly reduced; as the required voltage of the primary side of the high-voltage transformer T1 decreases, the driving time of the switching tube Q1 becomes short, and the single resonance period of the primary side becomes short, i.e., the resonance frequency in a set time period (e.g., in a unit mains cycle, the unit mains cycle may be 20ms) becomes high. The no-load state of the microwave oven 10 can be judged by detecting the current resonance frequency of the primary side of the high voltage transformer T1 for a set period of time.
Referring to fig. 5, in some embodiments, the detecting step S01 specifically includes:
step S0101, detecting the driving pulse width of the primary side of the high-voltage transformer T1 in a set time period;
and step S0102, acquiring the current resonant frequency according to the driving pulse width.
In certain embodiments, the detection module 12 specifically includes a drive pulse width detection module 122. Step S0101 can be implemented by the driving pulse width detection module 122, and step S0102 can be implemented by the detection module 12.
That is, the driving pulse width detection module 122 may be configured to detect a driving pulse width of the primary side of the high voltage transformer T1 in a set time period, and then the detection module 12 is configured to obtain the current resonant frequency according to the driving pulse width.
In particular, the detection module 12 includes a timer 134. The timer 134 may time the time of occurrence of a synchronization period to obtain a value of the driving pulse width, which is calculated to obtain the current resonant frequency.
Referring to fig. 6, in some embodiments, the detecting step S01 specifically includes:
step S0103, detecting a resonance period of a primary side of the high-voltage transformer T1 in a set time period;
and step S0104, acquiring the current resonance frequency according to the resonance period.
In certain embodiments, the detection module 12 specifically includes a resonant period detection module 124. Step S0103 may be implemented by the resonance period detection module 124, and step S0104 may be implemented by the detection module 12.
That is, the resonance period detecting module 124 may be configured to detect a resonance period of the primary side of the high voltage transformer T1 in a set time period, and then the detecting module 12 is configured to obtain the current resonance frequency according to the resonance period.
Similarly, when the resonant period is detected, the timer 134 may be used to time the occurrence of a synchronization period, and determine the resonant period, so as to obtain the current resonant frequency.
Referring to fig. 7, in some embodiments, the detecting step S01 specifically includes:
step S0105, detecting the resonance frequency of the primary side of the high-voltage transformer T1 in a set time period;
and step S0106, acquiring the current resonance frequency according to the resonance frequency.
In certain embodiments, the detection module 12 specifically includes a number of resonances detection module 126. Step S0105 may be implemented by the resonance number detection module 126, and step S0106 may be implemented by the detection module 12.
That is, the resonance number detection module 126 may be configured to detect the resonance number of the primary side of the high voltage transformer T1 in a set time period, and then the detection module 12 is configured to obtain the current resonance frequency according to the resonance number.
When the number of resonance times is detected, the number of resonance times in a set time period may be counted by the counter 132, so as to obtain the current resonance frequency.
In the design and production process of the microwave oven, the set resonant frequency and the set range are obtained through theoretical analysis and practical experiments, and can be prestored in the judgment module 14 of the microwave oven 10. The set range may be understood as an error range allowed when determining whether the microwave oven 10 is unloaded.
After the detection module 12 detects the current resonant frequency, the current resonant frequency may be sent to the determination module 14. The determining module 14 compares the current resonant frequency with the set resonant frequency to determine whether the microwave oven 10 is in the idle state, and determines that the microwave oven 10 is in the idle state if the current resonant frequency is higher than the set range of the set resonant frequency.
When the microwave oven 10 is in the unloaded state, the control module 16 stops the power output of the microwave oven 10 or reduces the operating power of the microwave oven by changing the driving signal of the microwave oven 10.
Referring to fig. 8, in some embodiments, the controlling step S03 further includes:
step S0301, when the microwave oven 10 is in the idle state and the power output of the microwave oven 10 is stopped, controls the microwave oven 10 to display an error code.
In some embodiments, the microwave oven 10 includes the display module 17, and step S0301 can be implemented by the control module 16 controlling the display module 17.
That is, the control module 16 may be used to control the display module 17 to display an error code when the microwave oven 10 is in an unloaded state and stops the power output of the microwave oven 10.
The microwave oven 10 may include an upper computer connected to the control module 16, the display module 17 may be provided on the upper computer, and the control module 16 controls the display module 17 to display an error code by communicating with the upper computer.
The detection module 12, the judgment module 14 and the control module 16 of the embodiment of the present invention may be integrated into an MCU (microcontrol unit) of the microwave oven, and the MCU implements detection of the current resonant frequency, control of the output power of the microwave oven 10 and display of error codes through pins. For example, the MCU may communicate with the upper computer to control the microwave oven 10 to display an error code.
In some embodiments, the set time period is a mains cycle. Specifically, the utility power cycle is, for example, 20ms, and thus, by setting the set time period as the utility power cycle, the complexity of the control design of the microwave oven 10 can be reduced and the application range of the microwave oven 10 can be widened.
In the description of the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or the first and second features being in contact, not directly, but via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
The following disclosure provides many different embodiments or examples for implementing different configurations of embodiments of the invention. In order to simplify the disclosure of embodiments of the invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, embodiments of the invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, embodiments of the present invention provide examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example" or "some examples" or the like mean 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, schematic representations of the above terms 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.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processing module-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of embodiments of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (2)
1. A microwave oven, characterized in that the microwave oven comprises:
the detection module is used for detecting the current resonant frequency of the primary side of the high-voltage transformer in a set time period;
the judging module is used for comparing the current resonance frequency with a set resonance frequency to judge whether the microwave oven is in an idle state, and if the current resonance frequency is higher than the set range of the set resonance frequency, judging that the microwave oven is in the idle state; and
a control module stopping power output of the microwave oven or reducing operation power of the microwave oven when the microwave oven is in an idle state;
the detection module comprises:
one end of the first resistor is connected with one end of the resonant capacitor;
one end of the second resistor is connected with the other end of the first resistor, the other end of the second resistor is grounded, and a first node is arranged between the first resistor and the second resistor;
one end of the third resistor is connected with the other end of the resonance capacitor; and
one end of the fourth resistor is connected with the other end of the third resistor, the other end of the fourth resistor is grounded, and a second node is arranged between the third resistor and the fourth resistor;
the detection module is used for detecting the current resonant frequency through the first node and the second node;
the detection module further comprises a processor and a comparator, the processor is used for reading the current resonant frequency, the comparator is used for comparing the voltage of the first node with the voltage of the second node, when the voltage of the first node is greater than or equal to the voltage of the second node, it is indicated that one synchronization occurs in a resonant period, the detection module further comprises a counter, when the resonant frequency waveform of a third node between the resonant capacitor and the third resistor rises from the lowest point to the highest point and then falls from the highest point to be less than the voltage of the first node, the process is a synchronization period, and the counter counts the number of times of synchronization occurs in the set time period to obtain the current resonant frequency.
2. The microwave oven according to claim 1, wherein the microwave oven comprises a display module, and the control module is configured to control the display module to display an error code when the microwave oven is in an unloaded state and the power output of the microwave oven is stopped.
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| CN107559903B (en) * | 2017-09-21 | 2019-10-01 | 广东美的厨房电器制造有限公司 | Judge unloaded method, system, computer equipment, storage medium and micro-wave oven |
| US20210242794A1 (en) * | 2018-04-26 | 2021-08-05 | Guangdong Midea Ketchen Appliances Manufacturing Co., Ltd. | Electronic transformer and a microwave cooking appliance |
| CN110530553B (en) * | 2019-08-07 | 2020-11-06 | 深圳麦格米特电气股份有限公司 | Magnetron state detection method, device, controller, circuit and system |
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