Abnormal Detection Method, Device, Readable Storage Medium, and Cooking Appliance

Abstract

The present invention provides an abnormal detection method, device, readable storage medium and cooking device. The abnormal detection method includes: obtaining the access voltage of a rectification circuit; when the access voltage of the rectification circuit is less than or equal to a first voltage value, collecting the voltage waveform at the first end of a switching device, where the voltage waveform is a waveform plotted based on the voltage value at the first end of the switching device when no current flows through the switching device; and determining the abnormal detection result of the cooking device according to the comparison result between the duration corresponding to the voltage waveform and a preset duration.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and in particular, to an anomaly detection method, device, readable storage medium, and cooking device. Background Art

[0002] A cooking device can radiate microwaves into space through a magnetron and use the microwaves to heat an object to be heated.

[0003] In related technical solutions, as Figure 1 shown, an AC power supply 101' inputs alternating current into a rectifying circuit 102'. The rectifying circuit 102' converts the alternating current into a DC voltage. After filtering out the noise in the DC voltage through a smoothing capacitor 103' and a coil 104', the DC voltage is connected and disconnected to supply power to the magnetron through a switching element 105'.

[0004] Specifically, during the off period, the voltage generated in the primary winding of a step-up transformer 106' will resonate with a resonant capacitor to generate a voltage. The voltage on the secondary side after being stepped up by the step-up transformer drives the magnetron 108' operating under high voltage through a rectifying and smoothing circuit 107' composed of a diode and a capacitor.

[0005] If a fault such as a short circuit occurs in the magnetron 108', the short-circuit current will cause the current flowing through a detection resistor 109' to increase compared to the normal value, thereby increasing the voltage across the detection resistor and causing the current to flow through the diode part of an optocoupler 110'. The output signal of the transistor of the optocoupler 110' is input to a secondary-side current detector. An abnormal signal is then sent to a control circuit 111' for protection operations. However, the current is connected to the secondary side through the detection resistor 109', while the control circuit 111' is connected to the primary side. Therefore, it is necessary to transmit signals through insulation and an optocoupler is also needed to use insulated components, which increases the number of components including peripheral components and results in an increase in cost.

[0006] In addition, high-voltage components are not only configured with rectifying and smoothing components such as diodes and capacitors in the magnetron but also in the high-voltage rectifying circuit. However, in the case of a malfunction such as a short circuit due to an abnormality in this component, the short-circuit current caused by the component malfunction does not flow through the detection resistor, so sometimes detection cannot be performed. Summary of the Invention

[0007] The present invention aims to at least solve one of the technical problems existing in the prior art or related technologies.

[0008] To this end, the first aspect of the present invention is to provide an anomaly detection method.

[0009] The second aspect of the present invention is to provide an anomaly detection device.

[0010] The third aspect of the present invention is to provide another abnormal detection device.

[0011] The fourth aspect of the present invention is to provide a readable storage medium.

[0012] The fifth aspect of the present invention is to provide a cooking device.

[0013] The sixth aspect of the present invention is to provide another cooking device.

[0014] In view of this, according to the first aspect of the present invention, the present invention provides an abnormal detection method for a cooking device, the cooking device includes a rectification circuit, an inverter circuit and a magnetron, the inverter circuit includes a switching device and a step-up transformer, a first end of the switching device is connected to a primary coil of the step-up transformer, and the abnormal detection method includes: obtaining an access voltage of the rectification circuit; when the access voltage of the rectification circuit is less than or equal to a first voltage value, collecting a voltage waveform at the first end of the switching device, the voltage waveform is a waveform drawn based on the voltage value at the first end of the switching device when no current flows through the switching device; determining an abnormal detection result of the cooking device according to a comparison result between a duration corresponding to the voltage waveform and a preset duration.

[0015] The technical solution of the present application proposes an abnormal detection method. By running the above abnormal detection method, in the case of a short circuit in the magnetron or a circuit behind the step-up transformer, the above abnormal event can be detected in time, so as to maintain the cooking device according to the abnormal detection result, and minimize the damage to the cooking device caused by the above abnormal situation.

[0016] The above technical solution of the present application is realized based on the following principle. Specifically, due to the constant voltage characteristic of high voltage in the operation of the magnetron, in the low voltage area of the AC voltage supply, there is a non-conduction area where the magnetron does not work, and in this interval, no current flows in the secondary side winding of the step-up transformer. However, when the magnetron is short-circuited, the non-conduction interval disappears, so even in the low voltage area of the AC voltage, current will flow in the secondary side winding of the step-up transformer.

[0017] Therefore, by collecting the voltage waveform at the first end of the switching device, in order to measure the situation of the non-conduction area in the above text based on the comparison result between the duration corresponding to the voltage waveform and the preset duration, so as to realize the detection of whether the magnetron is short-circuited.

[0018] In addition, anomalies are detected by the voltage waveform at the first terminal of the switching device. When a high-voltage component connected to the secondary side of the step-up transformer short-circuits due to an anomaly or other reasons, a short-circuit current will flow through the secondary winding of the step-up transformer. Under normal circumstances, no current will flow. If current flow is detected, anomalies in the magnetron can be detected. In this way, not only can short-circuits in the magnetron be detected, but anomalies in circuit components connected to the secondary winding side of the step-up transformer can also be detected, thereby improving safety and other quality-related performance.

[0019] It is worth noting that the technical solution of this application can perform detection without using insulation components such as optocouplers, which can reduce the manufacturing cost of the cooking device.

[0020] In some technical solutions, optionally, the first terminal of the switching device is the collector of the switching device.

[0021] In some technical solutions, optionally, the first voltage value can be determined according to the operating parameters of the magnetron, and its specific value will not be elaborated here.

[0022] In some technical solutions, optionally, by obtaining the duration corresponding to the voltage waveform at the first terminal of the switching device when the rectified voltage connected to the rectifier circuit is less than or equal to the first voltage value and the cooking device is normal, this duration is used as the preset duration.

[0023] In some technical solutions, optionally, the abscissa of the voltage waveform is time, and the ordinate is the voltage value at the first terminal of the switching device. Based on this, the duration corresponding to the voltage waveform can be understood as the cumulative duration of the measured voltage value when no current flows through the switching device.

[0024] In addition, the anomaly detection method proposed in this application also has the following additional technical features.

[0025] In some technical solutions, optionally, the anomaly detection result of the cooking device is determined according to the comparison result between the duration corresponding to the voltage waveform and the preset duration. Specifically, it includes: when the duration corresponding to the voltage waveform is less than the preset duration, the cooking device is abnormal; when the duration corresponding to the voltage waveform is greater than or equal to the preset duration, the cooking device is normal.

[0026] In this technical solution, based on the above principle, it can be known that when the magnetron has a short-circuit, the switching device will also conduct in the non-conducting region. Based on this, obviously, the voltage waveform at the first terminal where no current flows through the switching device will become narrower.

[0027] Based on this, when the duration corresponding to the voltage waveform is less than the preset duration, it is considered that the cooking device is abnormal, such as a magnetron or a component located on the secondary side of the step-up transformer has a short circuit. On the contrary, when the duration corresponding to the voltage waveform is greater than or equal to the preset duration, it is considered that there is no such short circuit situation.

[0028] In some technical solutions, optionally, the duration corresponding to the voltage waveform corresponds to a first width value, and the preset duration corresponds to a second width value. The abnormal detection result of the cooking device is determined according to the comparison result between the duration corresponding to the voltage waveform and the preset duration. Specifically, it includes: when the first width value is less than the second width value, the cooking device is abnormal; when the first width value is greater than or equal to the second width value, the cooking device is normal.

[0029] In this technical solution, the determination of whether the cooking device is abnormal is realized from another perspective.

[0030] In this technical solution, the determination of whether the cooking device is abnormal can be realized through the width value of the voltage waveform. In this process, the usage requirements in different scenarios can be applied, so as to intuitively judge whether the cooking device is abnormal.

[0031] In some technical solutions, optionally, the abnormal detection method further includes: controlling the working state of the switching device according to the abnormal detection result of the cooking device.

[0032] In this technical solution, the working state of the switching device can be controlled according to the abnormal detection result of the cooking device. In this process, the cooking device can be further controlled, so that when it is detected that the cooking device is abnormal, the cooking device can be further protected in time through the switching device, reducing the probability of cooking device failure.

[0033] In some technical solutions, optionally, controlling the working state of the switching device according to the abnormal detection result of the cooking device specifically includes: when the cooking device is abnormal, controlling the switching device to stop running; when the cooking device is normal, controlling the switching device to continue running.

[0034] In this technical solution, when it is detected that the cooking device is abnormal, the switching device is controlled to stop running, so that when the switching device stops running, the cooking device can stop running, thereby realizing further protection of the cooking device.

[0035] At the same time, when it is detected that the cooking device is normal, it is notified to control the switching device to continue running, so as to reduce the impact of the above abnormal detection on the operation of the cooking device, thereby ensuring the stable operation of the cooking device.

[0036] In some technical solutions, optionally, when the cooking device is normal, it can be understood that no abnormality of the cooking device is detected.

[0037] In some technical solutions, optionally, the abnormality detection method further includes: controlling the switching device to stop operating when the voltage value at the first end of the switching device is greater than or equal to the second voltage value; wherein, the first voltage value is less than the second voltage value.

[0038] In this technical solution, by comparing the voltage value at the first end of the switching device with the second voltage value, overvoltage protection can be achieved according to the comparison result. In this process, when overvoltage occurs, the operation of the cooking device can be stopped by controlling the switching device, so as to interrupt the operation of the cooking device in time, and further reduce the failure of the cooking device caused by overvoltage, affecting the stable operation of the cooking device.

[0039] According to the second aspect of the present invention, the present invention provides an abnormality detection device for a cooking device. The cooking device includes a rectification circuit, an inverter circuit and a magnetron. The inverter circuit includes a switching device and a step-up transformer. The first end of the switching device is connected to the primary coil of the step-up transformer. The abnormality detection device includes: an acquisition unit for acquiring the access voltage of the rectification circuit; a collection unit for collecting the voltage waveform at the first end of the switching device when the access voltage of the rectification circuit is less than or equal to the first voltage value. The voltage waveform is a waveform drawn based on the voltage value at the first end of the switching device when no current flows through the switching device; a determination unit for determining the abnormality detection result of the cooking device according to the comparison result between the duration corresponding to the voltage waveform and the preset duration.

[0040] The technical solution of the present application proposes an abnormality detection device, which can detect the above abnormal events in time when a short circuit occurs in the magnetron or the circuit behind the step-up transformer, so as to maintain the cooking device according to the abnormality detection result, and minimize the damage to the cooking device caused by the above abnormality.

[0041] The above technical solution of the present application is realized based on the following principle. Specifically, due to the constant voltage characteristic of the high voltage in the operation of the magnetron, there is a non-conducting area where the magnetron does not work in the low voltage area of the AC voltage supply. In this interval, no current flows in the secondary side winding of the step-up transformer. However, when the magnetron is short-circuited, the non-conducting interval disappears, so even in the low voltage area of the AC voltage, current will flow in the secondary side winding of the step-up transformer.

[0042] Therefore, by collecting the voltage waveform at the first end of the switching device, the situation of the non-conducting area in the above text can be measured based on the comparison result between the duration corresponding to the voltage waveform and the preset duration, so as to realize the detection of whether the magnetron is short-circuited.

[0043] In addition, anomalies are detected by the voltage waveform at the first end of the switching device. When a high-voltage component connected to the secondary side of the step-up transformer experiences a short circuit or other anomalies, a short-circuit current will flow through the secondary winding of the step-up transformer. Since no current flows under normal conditions, if current flow is detected, anomalies in the magnetron can be detected. In this way, not only can a short circuit in the magnetron be detected, but anomalies in circuit components connected to the secondary winding side of the step-up transformer can also be detected, thereby improving safety and other quality-related performance.

[0044] It is worth noting that with the technical solution of this application, detection can be carried out without using insulating components such as optocouplers, which can reduce the manufacturing cost of cooking equipment.

[0045] In some technical solutions, optionally, the first end of the switching device is the collector of the switching device.

[0046] In some technical solutions, optionally, the first voltage value can be determined according to the operating parameters of the magnetron, and its specific value will not be elaborated here.

[0047] In some technical solutions, optionally, by obtaining the duration corresponding to the voltage waveform at the first end of the switching device when the access voltage of the rectifier circuit is less than or equal to the first voltage value and recording it under the condition that the cooking equipment is normal, it is used as the preset duration.

[0048] In some technical solutions, optionally, the abscissa of the voltage waveform is time and the ordinate is the voltage value at the first end of the switching device. Based on this, the duration corresponding to the voltage waveform can be understood as the accumulated duration of the measured voltage value when no current flows through the switching device.

[0049] In addition, the anomaly detection device proposed in this application also has the following additional technical features.

[0050] In some technical solutions, optionally, the determination unit is specifically configured to: when the duration corresponding to the voltage waveform is less than the preset duration, the cooking equipment is abnormal; when the duration corresponding to the voltage waveform is greater than or equal to the preset duration, the cooking equipment is normal.

[0051] In this technical solution, based on the above principle, it can be known that when a short circuit occurs in the magnetron, the switching device will also conduct in the non-conducting region. Based on this, obviously, the voltage waveform when no current flows through the first end of the switching device will become narrower.

[0052] Based on this, when the duration corresponding to the voltage waveform is less than the preset duration, it is considered that the cooking equipment is abnormal, such as a short circuit in the magnetron or components located on the secondary side of the step-up transformer. Conversely, when the duration corresponding to the voltage waveform is greater than or equal to the preset duration, it is considered that no such short circuit situation has occurred.

[0053] In some technical solutions, optionally, the duration corresponding to the voltage waveform corresponds to a first width value, and the preset duration corresponds to a second width value. The determining unit is specifically configured to: when the first width value is less than the second width value, the cooking device is abnormal; when the first width value is greater than or equal to the second width value, the cooking device is normal.

[0054] In this technical solution, the determination of whether the cooking device is abnormal is implemented from another perspective.

[0055] In this technical solution, the determination of whether the cooking device is abnormal can be implemented by the width value of the voltage waveform. In this process, the usage needs in different scenarios can be applied, so as to intuitively determine whether the cooking device is abnormal.

[0056] In some technical solutions, optionally, the determining unit is further configured to: control the working state of the switching device according to the abnormal detection result of the cooking device.

[0057] In this technical solution, the working state of the switching device can be controlled according to the abnormal detection result of the cooking device. In this process, the cooking device can be further controlled, so that when it is detected that the cooking device is abnormal, the cooking device can be further protected in time through the switching device, reducing the probability of cooking device failure.

[0058] In some technical solutions, optionally, the determining unit is specifically configured to: when the cooking device is abnormal, control the switching device to stop running; when the cooking device is normal, control the switching device to continue running.

[0059] In this technical solution, when it is detected that the cooking device is abnormal, the switching device is controlled to stop running, so that when the switching device stops running, the cooking device can stop running, thereby further protecting the cooking device.

[0060] At the same time, when it is detected that the cooking device is normal, it is notified to control the switching device to continue running, so as to reduce the impact of the above abnormal detection on the operation of the cooking device, thereby ensuring the stable operation of the cooking device.

[0061] In some technical solutions, optionally, when the cooking device is normal, it can be understood that no abnormality of the cooking device is detected.

[0062] In some technical solutions, optionally, the determining unit is further configured to: when the voltage value at the first end of the switching device is greater than or equal to the second voltage value, control the switching device to stop running; where the first voltage value is less than the second voltage value.

[0063] In this technical solution, the voltage value at the first end of the switching device is compared with a second voltage value, so as to implement overvoltage protection according to the comparison result. In this process, when overvoltage occurs, the switching device can be controlled to stop operating, so as to interrupt the operation of the cooking device in time, thereby reducing the failure of the cooking device caused by overvoltage and affecting the stable operation of the cooking device.

[0064] According to the third aspect of the present invention, there is provided an abnormality detection device, including a processor and a memory. The memory stores programs or instructions that can run on the processor. When the programs or instructions are executed by the processor, the steps of the method as described in any one of the above are implemented.

[0065] According to the fourth aspect of the present invention, there is provided a readable storage medium. Programs or instructions are stored on the readable storage medium. When the programs or instructions are executed by the processor, the steps of the method as described in any one of the above are implemented.

[0066] According to the fifth aspect of the present invention, there is provided a cooking device, including: any one of the above-mentioned abnormality detection devices; and / or the above-mentioned readable storage medium.

[0067] According to the sixth aspect of the present invention, there is provided a cooking device, including: a rectification circuit, the input end of the rectification circuit is used to connect to an alternating current; a frequency conversion circuit, the input end of the frequency conversion circuit is connected to the output end of the rectification circuit, the frequency conversion circuit includes a switching device and a step-up transformer, and the first end of the switching device is connected to the primary coil of the step-up transformer; a magnetron, connected to the output end of the frequency conversion circuit; a voltage detection circuit, connected to the input end of the rectification circuit, and used to collect the access voltage of the rectification circuit; a control circuit, connected to the voltage detection circuit and the first end of the switching device, and used to execute the steps of the method as described in any one of the above.

[0068] In this technical solution, in the case of a short circuit in the magnetron or the circuit behind the step-up transformer, the above abnormal event can be detected in time, so as to maintain the cooking device according to the abnormality detection result, and minimize the damage to the cooking device caused by the above abnormality.

[0069] The above technical solution of the present application is implemented based on the following principle. Specifically, due to the constant voltage characteristic of the high voltage in the operation of the magnetron, in the low voltage area of the AC voltage supply, there is a non-conducting area where the magnetron does not work. In this interval, no current flows in the secondary side winding of the step-up transformer. However, when the magnetron is short-circuited, the non-conducting interval disappears, so even in the low voltage area of the AC voltage, current will flow in the secondary side winding of the step-up transformer.

[0070] Thus, by collecting the voltage waveform at the first end of the switching device, the situation of the non-conducting region in the above text can be measured based on the comparison result between the duration corresponding to the voltage waveform and the preset duration, thereby realizing the detection of whether the magnetron is short-circuited.

[0071] In addition, by detecting abnormalities through the voltage waveform at the first end of the switching device, when a high-voltage component connected to the secondary side of the step-up transformer is short-circuited or otherwise abnormal, a short-circuit current will flow through the secondary winding of the step-up transformer. Since no current will flow under normal circumstances, if current flow is detected, abnormalities in the magnetron can be detected. In this way, not only can the short-circuit of the magnetron be detected, but also abnormalities in the circuit components connected to the secondary winding side of the step-up transformer can be detected, thereby improving safety and other quality-related performance.

[0072] It is worth noting that by adopting the technical solution of this application, detection can be carried out without using insulating components such as optocouplers, which can reduce the manufacturing cost of the cooking device.

[0073] In some technical solutions, optionally, the first end of the switching device is the collector of the switching device.

[0074] In some technical solutions, optionally, the first voltage value can be determined according to the operating parameters of the magnetron, and its specific value will not be elaborated here.

[0075] In some technical solutions, optionally, by obtaining the duration corresponding to the voltage waveform at the first end of the switching device when the rectified circuit access voltage is less than or equal to the first voltage value and recording it under the condition that the cooking device is normal, it can be used as the preset duration.

[0076] In some technical solutions, optionally, the abscissa of the voltage waveform is time and the ordinate is the voltage value at the first end of the switching device. Based on this, the duration corresponding to the voltage waveform can be understood as the accumulated duration of the measured voltage value when no current flows through the switching device.

[0077] In addition, the cooking device proposed in this application also has the following additional technical features.

[0078] In some technical solutions, optionally, the control circuit includes a waveform detection circuit for collecting the voltage waveform at the first end of the switching device. The cooking device further includes: a first resistor connected in series between the first end of the switching device and the waveform detection circuit, with the first end of the first resistor connected to the first end of the switching device and the second end of the first resistor connected to the waveform detection circuit; a second resistor, with the first end of the second resistor connected to the second end of the first resistor and the second end of the second resistor grounded.

[0079] In this technical solution, by setting the first resistor and the second resistor, a loop is formed between the first end of the switching device and the ground by using the first resistor and the second resistor, and then a voltage division is formed on the first resistor and the second resistor. During this process, the voltage value at the second end of the first resistor changes synchronously with the voltage value at the first end of the switching device. Therefore, when the second end of the first resistor is connected to the waveform detection circuit, the measurement of the voltage fluctuation at the first end of the switching device can be achieved.

[0080] In some technical solutions, the resistance values of the first resistor and the second resistor can be selected according to actual usage needs, and their specific values will not be elaborated here.

[0081] In some technical solutions, the control circuit is a chip. Based on this, it can be understood that the waveform detection circuit is a module integrated in the chip.

[0082] In some technical solutions, optionally, the control circuit includes an overvoltage detection circuit. The overvoltage detection circuit is connected to the second end of the first resistor and is used to detect the voltage value at the first end of the switching device.

[0083] In this technical solution, by setting the overvoltage detection circuit, the detection of overvoltage is realized, and thus the protection of the cooking device is achieved.

[0084] In some technical solutions, optionally, it further includes: a drive circuit. The input end of the drive circuit is connected to the control circuit, and the output end of the drive circuit is connected to the control end of the switching device and is used to drive the switching device to act.

[0085] In this technical solution, by setting the drive circuit, the switching device is driven by using the drive circuit. During this process, the situation that the control circuit has weak driving ability and cannot directly and effectively control the switching device is reduced.

[0086] By setting the drive circuit, the driving ability of the control circuit can be improved, and thus the drive control of the switching device can be achieved.

[0087] Additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

[0089] Figure 1 Shows a topological schematic diagram of a cooking device in a related technical solution;

[0090] Figure 2Shows one of the schematic flowcharts of the anomaly detection method in an embodiment of the present application;

[0091] Figure 3 Shows the topological schematic diagram of a cooking device in an embodiment of the present application;

[0092] Figure 4 Shows the schematic diagram of the magnetron voltage and current in the case of no anomaly in an embodiment of the present application;

[0093] Figure 5 Shows the schematic diagram of the magnetron voltage and current in the case of anomaly in an embodiment of the present application;

[0094] Figure 6 Shows the schematic diagram of the change in OFF width in an embodiment of the present application;

[0095] Figure 7 Shows another schematic flowchart of the anomaly detection method in an embodiment of the present application;

[0096] Figure 8 Shows the schematic block diagram of an anomaly detection device in an embodiment of the present application;

[0097] Figure 9 Shows the schematic block diagram of another anomaly detection device in an embodiment of the present application.

[0098] Among them, Figure 1 The correspondence between the reference numerals and component names in the figure is as follows:

[0099] 101' AC power supply, 102' rectifier circuit, 103' smoothing capacitor, 104' coil, 105' switching element, 106' step-up transformer, 107' rectification and smoothing circuit, 108' magnetron, 109' detection resistor, 110' optocoupler, 111' control circuit.

[0100] Among them, Figure 3 The correspondence between the reference numerals and component names in the figure is as follows:

[0101] 302 rectifier circuit, 304 frequency conversion circuit, 306 magnetron, 308 voltage detection circuit, 310 control circuit, 312 waveform detection circuit, 314 overvoltage detection circuit, 316 drive circuit, C1 resonance capacitor, K switching device, T step-up transformer, R1 first resistor, R2 second resistor, D1 first diode, D2 second diode, D3 third diode, D4 fourth diode, C2 first capacitor, C3 second capacitor, C4 smoothing capacitor, L coil. Detailed implementation manners

[0102] In order to more clearly understand the above aspects, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0103] In the following description, many specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention may be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0104] In one embodiment of the present application, as Figure 2 and Figure 3 shown, an abnormal detection method is provided for a cooking device. The cooking device includes a rectifier circuit 302, a frequency conversion circuit 304, and a magnetron 306. The frequency conversion circuit 304 includes a switching device K and a step-up transformer T. The first end of the switching device K is connected to the primary coil of the step-up transformer T. As Figure 2 shown, the abnormal detection method includes:

[0105] Step 202, obtaining the access voltage of the rectifier circuit;

[0106] Step 204, when the access voltage of the rectifier circuit is less than or equal to the first voltage value, collecting the voltage waveform at the first end of the switching device. The voltage waveform is a waveform drawn based on the voltage value at the first end of the switching device when no current flows through the switching device;

[0107] Step 206, determining the abnormal detection result of the cooking device according to the comparison result between the duration corresponding to the voltage waveform and the preset duration.

[0108] An embodiment of the present application proposes an abnormal detection method. By running the above abnormal detection method, in the case of a short circuit in the magnetron 306 or the circuit behind the step-up transformer T, the above abnormal event can be detected in time, so as to maintain the cooking device according to the abnormal detection result and minimize the damage to the cooking device caused by the above abnormality.

[0109] The above embodiment of the present application is implemented based on the following principle. Specifically, as Figure 4 、 Figure 5 and Figure 6 shown, due to the constant voltage characteristic of the high voltage in the operation of the magnetron 306, there is a non-conduction area where the magnetron 306 does not work in the low voltage area of the AC voltage supply. In this interval, no current flows in the secondary side winding of the step-up transformer T. However, when the magnetron 306 is short-circuited, the non-conduction interval disappears. Therefore, even in the low voltage area of the AC voltage, current will flow in the secondary side winding of the step-up transformer T.

[0110] Thus, by collecting the voltage waveform at the first terminal of the switching device K, the situation of the non-conducting region in the above text can be measured based on the comparison result between the duration corresponding to the voltage waveform and the preset duration, thereby realizing the detection of whether the magnetron 306 is short-circuited.

[0111] In addition, by detecting abnormalities through the voltage waveform at the first terminal of the switching device K, when a high-voltage component connected to the secondary side of the step-up transformer T is short-circuited or otherwise abnormal, a short-circuit current will flow through the secondary winding of the step-up transformer T. Since no current will flow under normal circumstances, if current flow is detected, abnormalities in the magnetron 306 can be detected. In this way, not only can the short-circuit of the magnetron 306 be detected, but also abnormalities in the circuit components connected to the secondary winding side of the step-up transformer T can be detected, thereby improving safety and other quality-related performance.

[0112] Among them, the OFF width is determined by the resonance voltage between the inductance of the primary winding of the step-up transformer T and the capacitance of the resonance capacitor C1. The general formula is as follows.

[0113]

[0114] Among them, f is the OFF width, L represents the inductance of the primary winding of the step-up transformer T, and C represents the capacitance of the resonance capacitor C1.

[0115] The resonance capacitor C1 usually uses a thin-film capacitor, so the capacitance change is very small. However, the inductance of the primary winding of the step-up transformer T will decrease due to the current in the secondary winding because, in terms of transformer characteristics, the primary and secondary windings are wound and coupled. As a characteristic of the transformer, it has the characteristic of the coupling coefficient. As the step-up transformer T used in the high-frequency heating device, it is usually set to K = 0.6 - 0.8. The general formula for the coupling coefficient is as follows:

[0116]

[0117] K is the coupling coefficient, Ls is the inductance when the secondary is short-circuited, and Lo is the inductance when the secondary is open-circuited.

[0118] For example, if Ls is calculated using this formula, the coupling coefficient K = 0.7 and Lo = 40uH, then Ls = 20.4uH. This means that when the secondary winding of the step-up transformer T is open-circuited and no current flows, the primary inductance value is 40uH, but when the secondary current increases and a short-circuit occurs, the inductance value becomes 20.4uH.

[0119] It is worth noting that the embodiment of the present application can perform detection without using insulating components such as opto-couplers, which can reduce the manufacturing cost of the cooking device.

[0120] In some embodiments, optionally, the first end of the switching device K is the collector of the switching device K.

[0121] In some embodiments, optionally, the first voltage value can be determined according to the operating parameters of the magnetron 306, and its specific value will not be elaborated here.

[0122] In some embodiments, optionally, by obtaining the duration corresponding to the voltage waveform at the first end of the switching device K when the access voltage of the rectifier circuit 302 is less than or equal to the first voltage value recorded under the condition that the cooking device is normal, as the preset duration.

[0123] In some embodiments, optionally, the abscissa of the voltage waveform is time, and the ordinate is the voltage value at the first end of the switching device K. Based on this, the duration corresponding to the voltage waveform can be understood as the accumulated duration of the measured voltage value when no current flows through the switching device K.

[0124] In some embodiments, optionally, the abnormal detection result of the cooking device is determined according to the comparison result between the duration corresponding to the voltage waveform and the preset duration, specifically including: when the duration corresponding to the voltage waveform is less than the preset duration, the cooking device is abnormal; when the duration corresponding to the voltage waveform is greater than or equal to the preset duration, the cooking device is normal.

[0125] In this embodiment, based on the above principle, it can be known that when the magnetron 306 is short-circuited, the switching device K will also conduct in the non-conducting region. Based on this, obviously, the voltage waveform of the first end of the switching device K without current flowing through will become narrower.

[0126] Based on this, when the duration corresponding to the voltage waveform is less than the preset duration, it is considered that the cooking device is abnormal, such as a short circuit in the magnetron 306 or the components located on the secondary side of the step-up transformer T. On the contrary, when the duration corresponding to the voltage waveform is greater than or equal to the preset duration, it is considered that the above short-circuit situation does not occur.

[0127] In some embodiments, optionally, the duration corresponding to the voltage waveform corresponds to a first width value, and the preset duration corresponds to a second width value. The abnormal detection result of the cooking device is determined according to the comparison result between the duration corresponding to the voltage waveform and the preset duration, specifically including: when the first width value is less than the second width value, the cooking device is abnormal; when the first width value is greater than or equal to the second width value, the cooking device is normal.

[0128] In this embodiment, the determination of whether the cooking device is abnormal is realized from another perspective.

[0129] In this embodiment, the determination of whether the cooking device is abnormal can be achieved through the width value of the voltage waveform. In this process, the usage requirements in different scenarios can be applied, so as to intuitively judge whether the cooking device is abnormal.

[0130] In some embodiments, optionally, the abnormal detection method further includes: controlling the working state of the switching device K according to the abnormal detection result of the cooking device.

[0131] In this embodiment, the working state of the switching device K can be controlled according to the abnormal detection result of the cooking device. In this process, the cooking device can be further controlled, so as to realize further protection of the cooking device in time through the switching device K when it is detected that the cooking device is abnormal, and reduce the probability of cooking device failure.

[0132] In some embodiments, optionally, controlling the working state of the switching device K according to the abnormal detection result of the cooking device specifically includes: controlling the switching device K to stop running when the cooking device is abnormal; controlling the switching device K to continue running when the cooking device is normal.

[0133] In this embodiment, when it is detected that the cooking device is abnormal, the switching device K is controlled to stop running, so that the cooking device can stop running when the switching device K stops running, and further protection of the cooking device can be realized.

[0134] At the same time, when it is detected that the cooking device is normal, it is notified to control the switching device K to continue running, so as to reduce the impact of the above abnormal detection on the operation of the cooking device, and ensure the stable operation of the cooking device.

[0135] In some embodiments, optionally, when the cooking device is normal, it can be understood that no abnormality of the cooking device is detected.

[0136] In some embodiments, optionally, the abnormal detection method further includes: controlling the switching device K to stop running when the voltage value at the first end of the switching device K is greater than or equal to the second voltage value; wherein, the first voltage value is less than the second voltage value.

[0137] In this embodiment, the voltage value at the first end of the switching device K is compared with the second voltage value, so as to achieve overvoltage protection according to the comparison result. In this process, when overvoltage occurs, the switching device K can be controlled to stop running, so as to interrupt the operation of the cooking device in time, and further reduce the failure of the cooking device caused by overvoltage and affect the stable operation of the cooking device.

[0138] In some embodiments, as Figure 7 shown, the abnormal detection method includes:

[0139] Step 702, AC voltage input;

[0140] Step 704, perform voltage conversion;

[0141] Step 706, measure the OFF width in the low-voltage device;

[0142] Step 708, if the OFF width is below the specified value and the judgment result is yes, execute Step 710; if the judgment result is no, execute Step 704;

[0143] Step 710, stop the operation abnormally.

[0144] In this embodiment, the OFF width is also the first width value in this application, and the specified value is also the second width value in this application.

[0145] In this embodiment, by comparing the OFF width with the specified value, the determination of the short circuit of the magnetron 306 is realized.

[0146] In one of the embodiments, as Figure 8 shown, the present invention provides an abnormality detection device 800 for a cooking device. The cooking device includes a rectification circuit 302, a frequency conversion circuit 304, and a magnetron 306. The frequency conversion circuit 304 includes a switching device K and a step-up transformer T. The first end of the switching device K is connected to the primary coil of the step-up transformer T. The abnormality detection device includes: an acquisition unit 802 for acquiring the access voltage of the rectification circuit 302; a collection unit 804 for collecting the voltage waveform at the first end of the switching device K when the access voltage of the rectification circuit 302 is less than or equal to the first voltage value, and the voltage waveform is a waveform drawn based on the voltage value at the first end of the switching device K when no current flows through the switching device; a determination unit 806 for determining the abnormality detection result of the cooking device according to the comparison result between the duration corresponding to the voltage waveform and the preset duration.

[0147] An embodiment of the present application proposes an abnormality detection device 800, which can detect the above abnormal events in time when a short circuit occurs in the magnetron 306 or the circuit behind the step-up transformer T, so as to maintain the cooking device according to the abnormality detection result and minimize the damage to the cooking device caused by the above abnormality.

[0148] The above embodiments of the present application are implemented based on the following principle. Specifically, due to the constant voltage characteristic of the high voltage in the operation of the magnetron 306, there is a non-conduction area where the magnetron 306 does not work in the low-voltage area of the AC voltage supply. In this interval, no current flows in the secondary side winding of the step-up transformer T. However, when the magnetron 306 is short-circuited, the non-conduction interval disappears, so even in the low-voltage area of the AC voltage, current will flow in the secondary side winding of the step-up transformer T.

[0149] Thus, by collecting the voltage waveform of the first terminal of the switching device K, the situation of the non-conducting region in the above text can be measured based on the comparison result between the duration corresponding to the voltage waveform and the preset duration, so as to detect whether the magnetron 306 is short-circuited.

[0150] In addition, by detecting abnormalities through the voltage waveform of the first terminal of the switching device K, when a high-voltage component connected to the secondary side of the step-up transformer T is short-circuited or the like due to abnormalities or the like, a short-circuit current will flow through the secondary winding of the step-up transformer T. Since no current will flow under normal circumstances, if a current is detected flowing through, the abnormality of the magnetron 306 can be detected. In this way, not only can the short-circuit of the magnetron 306 be detected, but also the abnormality of the circuit components connected to the secondary winding side of the step-up transformer T can be detected, thereby improving safety and other quality-related performances.

[0151] It should be noted that the embodiments of the present application can perform detection without using insulating components such as optocouplers, which can reduce the manufacturing cost of the cooking device.

[0152] In some embodiments, optionally, the first terminal of the switching device K is the collector of the switching device K.

[0153] In some embodiments, optionally, the first voltage value can be determined according to the operating parameters of the magnetron 306, and its specific value will not be elaborated here.

[0154] In some embodiments, optionally, the preset duration can be obtained by acquiring the duration corresponding to the voltage waveform of the first terminal of the switching device K when the input voltage of the rectifier circuit 302 is less than or equal to the first voltage value and the cooking device is normal.

[0155] In some embodiments, optionally, the abscissa of the voltage waveform is time and the ordinate is the voltage value of the first terminal of the switching device K. Based on this, the duration corresponding to the voltage waveform can be understood as the accumulated duration of the measured voltage value when no current flows through the switching device K.

[0156] In some embodiments, optionally, the determining unit 806 is specifically configured to: when the duration corresponding to the voltage waveform is less than the preset duration, the cooking device is abnormal; when the duration corresponding to the voltage waveform is greater than or equal to the preset duration, the cooking device is normal.

[0157] In this embodiment, based on the above principle, it can be known that when the magnetron 306 is short-circuited, the switching device K will also conduct in the non-conducting region. Based on this, obviously, the voltage waveform when no current flows through the first terminal of the switching device K will become narrower.

[0158] Based on this, when the duration corresponding to the voltage waveform is less than the preset duration, it is considered that the cooking device is abnormal, for example, the magnetron 306 or the components located on the secondary side of the step-up transformer T are short-circuited. On the contrary, when the duration corresponding to the voltage waveform is greater than or equal to the preset duration, it is considered that the above short-circuit situation does not occur.

[0159] In some embodiments, optionally, the duration corresponding to the voltage waveform corresponds to a first width value, and the preset duration corresponds to a second width value. The determining unit 806 is specifically configured to: when the first width value is less than the second width value, the cooking device is abnormal; when the first width value is greater than or equal to the second width value, the cooking device is normal.

[0160] In this embodiment, the determination of whether the cooking device is abnormal is realized from another perspective.

[0161] In this embodiment, the determination of whether the cooking device is abnormal can be realized by the width value of the voltage waveform. In this process, the usage requirements in different scenarios can be applied, so as to intuitively judge whether the cooking device is abnormal.

[0162] In some embodiments, optionally, the determining unit 806 is further configured to: control the working state of the switching device K according to the abnormal detection result of the cooking device.

[0163] In this embodiment, the working state of the switching device K can be controlled according to the abnormal detection result of the cooking device. In this process, the cooking device can be further controlled, so that when it is detected that the cooking device is abnormal, the cooking device can be further protected in time through the switching device K, reducing the probability of cooking device failure.

[0164] In some embodiments, optionally, the determining unit 806 is specifically configured to: when the cooking device is abnormal, control the switching device K to stop running; when the cooking device is normal, control the switching device K to continue running.

[0165] In this embodiment, when it is detected that the cooking device is abnormal, by controlling the switching device K to stop running, so that when the switching device K stops running, the cooking device can stop running, thereby realizing further protection of the cooking device.

[0166] At the same time, when it is detected that the cooking device is normal, it is notified to control the switching device K to continue running, so as to reduce the impact of the above abnormal detection on the operation of the cooking device, thereby ensuring the stable operation of the cooking device.

[0167] In some embodiments, optionally, when the cooking device is normal, it can be understood that no abnormality of the cooking device is detected.

[0168] In some embodiments, optionally, the determining unit 806 is further configured to: control the switching device K to stop operating when the voltage value at the first end of the switching device K is greater than or equal to a second voltage value; wherein, the first voltage value is less than the second voltage value.

[0169] In this embodiment, by comparing the voltage value at the first end of the switching device K with the second voltage value, overvoltage protection can be achieved according to the comparison result. During this process, when overvoltage occurs, the switching device K can be controlled to stop operating, so as to interrupt the operation of the cooking device in a timely manner, thereby reducing the malfunction of the cooking device caused by overvoltage and affecting the stable operation of the cooking device.

[0170] In one of the embodiments, as Figure 9 shown, the present invention provides an abnormality detection device 900, including a processor 902 and a memory 904. The memory 904 stores programs or instructions that can run on the processor 902. When the programs or instructions are executed by the processor 902, the steps of the method according to any one of the above are implemented.

[0171] The methods can be implemented in various different ways according to specific features and / or example applications. For example, these methods can be implemented through a combination of hardware, firmware, and / or software. For example, in a hardware implementation, the processor can be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, electronic devices, other device units for performing the above functions, and / or combinations thereof.

[0172] In one of the embodiments, the present invention provides a readable storage medium. Programs or instructions are stored on the readable storage medium. When the programs or instructions are executed by the processor, the steps of the method according to any one of the above are implemented.

[0173] A readable storage medium can be a tangible device that can retain and store instructions for use by an instruction execution device. The readable storage medium can be an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the above devices, but is not limited thereto. A non-exhaustive list of more specific examples of the readable storage medium includes: portable computer floppy disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital versatile disk (DVD), memory cards, floppy disks, encoding mechanical devices (such as punched cards or grooves with raised structures recording instructions), and any suitable combination of the above devices. The readable storage medium used herein should not be construed as a transmitted signal itself, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission media, or electrical signals transmitted through wires, etc.

[0174] In one embodiment, the present invention provides a cooking device, including: any one of the above abnormal detection devices; and / or the above readable storage medium.

[0175] In one embodiment, as Figure 3 shown, the present invention provides a cooking device, including: a rectifier circuit 302, the input end of the rectifier circuit 302 is used to access alternating current; a frequency conversion circuit 304, the input end of the frequency conversion circuit is connected to the output end of the rectifier circuit 302, the frequency conversion circuit 304 includes a switching device K and a boost transformer T, and the first end of the switching device K is connected to the primary coil of the boost transformer T; a magnetron 306, connected to the output end of the frequency conversion circuit; a voltage detection circuit 308, connected to the input end of the rectifier circuit 302, for collecting the access voltage of the rectifier circuit 302; a control circuit 310, connected to the voltage detection circuit 308 and the first end of the switching device K, for executing the steps of any one of the above methods.

[0176] In this embodiment, in the case of a short circuit in the magnetron 306 or the circuit located behind the boost transformer T, the above abnormal event can be detected in time, so as to maintain the cooking device according to the abnormal detection result, and minimize the damage to the cooking device caused by the above abnormality.

[0177] The above embodiments of the present application are implemented based on the following principles. Specifically, due to the constant voltage characteristic of the high voltage, in the low voltage region of the AC voltage supply, there is a non-conducting region where the magnetron 306 does not work. In this interval, no current flows in the secondary winding of the step-up transformer T. However, when the magnetron 306 is short-circuited, the non-conducting interval disappears. Therefore, even in the low voltage region of the AC voltage, current will flow in the secondary winding of the step-up transformer T.

[0178] Thus, by collecting the voltage waveform at the first end of the switching device K, the situation of the non-conducting region described above can be measured based on the comparison result between the duration corresponding to the voltage waveform and the preset duration, so as to detect whether the magnetron 306 is short-circuited.

[0179] In addition, by detecting abnormalities through the voltage waveform at the first end of the switching device K, when a high-voltage component connected to the secondary side of the step-up transformer T is short-circuited or otherwise abnormal, a short-circuit current will flow through the secondary winding of the step-up transformer T. Since under normal circumstances, no current will flow, if current flow is detected, the abnormality of the magnetron 306 can be detected. In this way, not only can the short circuit of the magnetron 306 be detected, but also the abnormality of the circuit components connected to the secondary winding side of the step-up transformer T can be detected, thereby improving safety and other quality-related performances.

[0180] It should be noted that the embodiments of the present application can perform detection without using insulating components such as optocouplers, which can reduce the manufacturing cost of the cooking device.

[0181] In some embodiments, optionally, the first end of the switching device K is the collector of the switching device K.

[0182] In some embodiments, optionally, the first voltage value can be determined according to the operating parameters of the magnetron 306, and its specific value will not be elaborated here.

[0183] In some embodiments, optionally, by obtaining the duration corresponding to the voltage waveform at the first end of the switching device K when the rectified voltage of the rectifier circuit 302 is less than or equal to the first voltage value and recording it under the condition that the cooking device is normal, it can be used as the preset duration.

[0184] In some embodiments, optionally, the abscissa of the voltage waveform is time and the ordinate is the voltage value at the first end of the switching device K. Based on this, the duration corresponding to the voltage waveform can be understood as the accumulated duration of the measured voltage value when no current flows through the switching device K.

[0185] In addition, the cooking device proposed by the present application further has the following additional technical features.

[0186] In some embodiments, optionally, the control circuit 310 includes a waveform detection circuit 312 for collecting the voltage waveform at the first end of the switching device K. The cooking device further includes: a first resistor R1 connected in series between the first end of the switching device K and the waveform detection circuit 312, with the first end of the first resistor R1 connected to the first end of the switching device K and the second end of the first resistor R1 connected to the waveform detection circuit 312; and a second resistor R2 with the first end of the second resistor R2 connected to the second end of the first resistor R1 and the second end of the second resistor R2 grounded.

[0187] In this embodiment, by providing the first resistor R1 and the second resistor R2, a loop is formed between the first end of the switching device K and the ground using the first resistor R1 and the second resistor R2, and thus a voltage division is formed across the first resistor R1 and the second resistor R2. During this process, the voltage value at the second end of the first resistor R1 changes synchronously with the voltage value at the first end of the switching device K. Therefore, when the second end of the first resistor R1 is connected to the waveform detection circuit 312, the measurement of the voltage fluctuation at the first end of the switching device K can be achieved.

[0188] In some embodiments, the resistance values of the first resistor R1 and the second resistor R2 can be selected according to actual usage requirements, and their specific values will not be elaborated here.

[0189] In some embodiments, the control circuit 310 is a chip. Based on this, it can be understood that the waveform detection circuit 312 is a module integrated in the chip.

[0190] [[ID=1X]]In some embodiments, optionally, the control circuit 310 includes an overvoltage detection circuit 314 connected to the second end of the first resistor R1 for detecting the voltage value at the first end of the switching device K.

[0191] In this embodiment, by providing the overvoltage detection circuit 314, the detection of overvoltage is achieved, and thus the protection of the cooking device is realized.

[0192] In some embodiments, optionally, it further includes: a drive circuit 316 with the input end of the drive circuit 316 connected to the control circuit 310 and the output end of the drive circuit 316 connected to the control end of the switching device K for driving the switching device K to operate.

[0193] In this embodiment, by providing the drive circuit 316, the drive of the switching device K is achieved using the drive circuit 316. During this process, the situation where the control circuit 310 has weak driving ability and cannot effectively control the switching device K directly is reduced.

[0194] By setting the drive circuit 316, the driving ability of the control circuit 310 can be improved, thereby realizing the drive control of the switching device K.

[0195] In some embodiments, optionally, the frequency conversion circuit 304 further includes: a resonant capacitor C1, a first end of the resonant capacitor C1 is connected to a first end of a primary coil of the step-up transformer T, and a second end of the resonant capacitor C1 is connected to a first end of the switching device K.

[0196] In this embodiment, by setting the resonant capacitor C1, so that the resonant capacitor C1 resonates with the primary coil, thereby supplying power to the magnetron 306.

[0197] Specifically, a first end of a first secondary coil of the step-up transformer T is connected to a first end of the magnetron 306, a second end of the first secondary coil of the step-up transformer T is connected to a second end of the magnetron 306, and a grounded end of the magnetron 306 is grounded.

[0198] In some embodiments, optionally, the frequency conversion circuit 304 further includes: a voltage multiplier circuit, a first input end of the voltage multiplier circuit is connected to a first end of a second secondary coil of the step-up transformer T, a second input end of the voltage multiplier circuit is connected to a second end of the second secondary coil of the step-up transformer T, a first output end of the voltage multiplier circuit is connected to a second end of the magnetron 306, and a second output end of the voltage multiplier circuit is connected to a grounded end of the magnetron 306.

[0199] In some embodiments, optionally, the voltage multiplier circuit includes: a first diode D1, an anode of the first diode D1 serves as the first output end of the voltage multiplier circuit, and a cathode of the first diode D1 is connected to a first end of the second secondary coil of the step-up transformer T; a second diode D2, an anode of the second diode D2 is connected to the cathode of the first diode D1, and a cathode of the second diode D2 is the second output end of the voltage multiplier circuit; a first capacitor C2, a first end of the first capacitor C2 is connected to the anode of the first diode D1, and a second end of the first capacitor C2 is connected to a second end of the second secondary coil of the step-up transformer T; a second capacitor C3, a first end of the second capacitor C3 is connected to a second end of the first capacitor C2, and a second end of the second capacitor C3 is connected to the cathode of the second diode D2.

[0200] In some embodiments, optionally, the frequency conversion circuit 304 further includes: a smoothing capacitor C4 and a coil L, wherein, a first end of the smoothing capacitor C4 is connected to a first end of the primary coil, and a second end of the smoothing capacitor C4 is connected to a second end of the switching device K; the coil L is located between a first output end of the rectification circuit 302 and a first end of the smoothing capacitor C4.

[0201] In this embodiment, by setting the smoothing capacitor C4 and the coil L, so as to provide a stable DC voltage to the step-up transformer T, thereby improving the stability of the cooking device.

[0202] In some embodiments, optionally, the voltage detection circuit 308 is connected to the input end of the rectification circuit 302 through the third diode D3 and the fourth diode D4.

[0203] Specifically, the first input end of the rectification circuit 302 is connected to the anode of the third diode D3, the second input end of the rectification circuit 302 is connected to the anode of the fourth diode D4, and the cathodes of the third diode D3 and the fourth diode D4 are connected to the voltage detection circuit 308.

[0204] In this embodiment, through the above arrangement, the stability of the detection result of the voltage detection circuit 308 can be ensured.

[0205] In one of the embodiments, the cooking device is a microwave oven, a microwave steam oven, or a food heating device that uses a magnetron for heating.

[0206] The features of the terms "first" and "second" in the description and claims of this application may explicitly or implicitly include one or more of such features. In the text description of the present invention, unless otherwise specified, the meaning of "plural" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects. The character " / " generally means an "or" relationship between the associated objects before and after.

[0207] In the claims, description, and description drawings of the present invention, the term "plural" refers to two or more, unless otherwise clearly defined. The orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and making the description process simpler, rather than indicating or implying that the device or element referred to must have the specific orientation, be constructed and operated in the specific orientation. Therefore, these descriptions should not be construed as limitations on the present invention; terms such as "connection", "installation", and "fixation" should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances of the above data.

[0208] In the claims, the specification and the drawings of the present invention, the descriptions of the terms "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the claims, the specification and the drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0209] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for detecting anomalies in a cooking device, characterized in that: The cooking device includes a rectifier circuit, a frequency conversion circuit, and a magnetron. The frequency conversion circuit includes a switch device and a step-up transformer. A first end of the switch device is connected to a primary coil of the step-up transformer. The abnormality detection method includes: Obtaining an input voltage of the rectifier circuit; When the input voltage of the rectifier circuit is less than or equal to a first voltage value, collecting a voltage waveform of the first terminal of the switching device, the voltage waveform being a waveform drawn based on the voltage value of the first terminal of the switching device when no current flows through the switching device; The abnormality detection result of the cooking device is determined based on a comparison result of the duration corresponding to the voltage waveform and a preset duration.

2. The anomaly detection method according to claim 1, wherein: The determining of the abnormality detection result of the cooking device according to the comparison result of the duration corresponding to the voltage waveform and the preset duration specifically includes: When the duration corresponding to the voltage waveform is less than the preset duration, the cooking device is abnormal; When the duration corresponding to the voltage waveform is greater than or equal to the preset duration, there is no abnormality in the cooking device.

3. The anomaly detection method according to claim 1, wherein: The duration corresponding to the voltage waveform corresponds to a first width value, the preset duration corresponds to a second width value, and determining the abnormality detection result of the cooking device based on a comparison result of the duration corresponding to the voltage waveform and the preset duration specifically includes: When the first width value is smaller than the second width value, the cooking device is abnormal; When the first width value is greater than or equal to the second width value, there is no abnormality in the cooking device.

4. The abnormality detection method according to any one of claims 1 to 3, characterized in that: The anomaly detection method further includes: The working state of the switch device is controlled according to the abnormality detection result of the cooking device.

5. The anomaly detection method according to claim 4, characterized in that: The controlling the working state of the switch device according to the abnormality detection result of the cooking device specifically includes: When the cooking device is abnormal, controlling the switch device to stop operating; When there is no abnormality in the cooking device, the switch device is controlled to continue operating.

6. The abnormality detection method according to any one of claims 1 to 3, characterized in that: The anomaly detection method further includes: When the voltage value of the first terminal of the switching device is greater than or equal to the second voltage value, controlling the switching device to stop operating; The first voltage value is smaller than the second voltage value.

7. An abnormality detection device for cooking equipment, characterized in that: The cooking device includes a rectifier circuit, a frequency conversion circuit, and a magnetron. The frequency conversion circuit includes a switch device and a step-up transformer. The first end of the switch device is connected to the primary coil of the step-up transformer. The abnormality detection device includes: an acquisition unit, configured to acquire an access voltage of the rectifier circuit; a collecting unit, configured to collect a voltage waveform at the first end of the switching device when the input voltage of the rectifier circuit is less than or equal to a first voltage value, wherein the voltage waveform is a waveform drawn based on the voltage value at the first end of the switching device when no current flows through the switching device; A determination unit is used to determine an abnormality detection result of the cooking device according to a comparison result of a duration corresponding to the voltage waveform and a preset duration.

8. An abnormality detection device, characterized in that: The method comprises a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A cooking device, characterized in that: include: The abnormality detection device according to claim 7 or 8; and / or The readable storage medium according to claim 9.

11. A cooking device, characterized in that: include: A rectifier circuit, wherein the input end of the rectifier circuit is used to receive alternating current; a frequency conversion circuit, wherein an input end of the frequency conversion circuit is connected to an output end of the rectifier circuit, the frequency conversion circuit comprises a switching device and a step-up transformer, and a first end of the switching device is connected to a primary coil of the step-up transformer; a magnetron connected to the output end of the frequency conversion circuit; a voltage detection circuit connected to the input end of the rectifier circuit and used to collect the access voltage of the rectifier circuit; A control circuit is connected to the voltage detection circuit and the first end of the switching device, and is used to perform the steps of the method according to any one of claims 1 to 6.

12. The cooking device according to claim 11, characterized in that The control circuit includes a waveform detection circuit for collecting a voltage waveform at the first end of the switching device. The cooking device further includes: a first resistor, the first resistor being connected in series between the first end of the switching device and the waveform detection circuit, the first end of the first resistor being connected to the first end of the switching device, and the second end of the first resistor being connected to the waveform detection circuit; a second resistor, wherein a first end of the second resistor is connected to the second end of the first resistor, and a second end of the second resistor is grounded.

13. The cooking device according to claim 12, characterized in that The control circuit includes an overvoltage detection circuit, which is connected to the second end of the first resistor and is used to detect the voltage value of the first end of the switching device.

14. The cooking device according to claim 11, wherein Also includes: A driving circuit, wherein the input end of the driving circuit is connected to the control circuit, and the output end of the driving circuit is connected to the control end of the switching device, and is used to drive the switching device to operate.

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