Working state control method, controller, induction cooker and readable storage medium

Abstract

The invention discloses a working state control method, a controller, an induction cooker and a readable storage medium, the working state control method is applied to the induction cooker, the induction cooker comprises a wire coil and a switch tube, and the wire coil is connected with a direct current power supply and the switch tube. And obtaining the target working frequency of the switching tube and the target working current flowing through the switching tube. When the induction cooker works, the current working frequency of the switching tube and the current working current flowing through the switching tube are obtained. When the absolute value of the difference value between the target working frequency and the current working frequency is larger than a preset frequency threshold value, the induction cooker is controlled to keep working or stop working according to the comparison result of the target working current and the current working current. Through the mode, the electromagnetic oven control method can be suitable for application scenes of quick movement and slow movement of cookware, so that the electromagnetic oven is accurately controlled, and the working safety and reliability of the electromagnetic oven are improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of induction cookers, and particularly to a working state control method, a controller, an induction cooker, and a readable storage medium. Background Art

[0002] With the improvement of people's living standards, more and more electronic products have entered people's daily lives. For example, kitchen utensils such as induction cookers have become essential tools in the kitchen. Among them, an induction cooker is a cooking appliance that uses electromagnetic induction heating. The coil in the induction cooker generates a rapidly changing magnetic field to generate eddy currents at the bottom of the cookware, and then heats the cookware through the eddy currents. When the induction cooker heats the cookware, if the position of the cookware is shifted (for example, the cookware is removed), it may cause the product to overheat or be damaged, and even cause a fire, posing a great safety hazard.

[0003] However, the current methods for detecting whether the position of the cookware is shifted are all for the case of rapid movement of the cookware, but for the case of slow movement of the cookware, false detection usually occurs, and it may still cause the product to overheat or be damaged. Summary of the Invention

[0004] The embodiments of the present application provide a working state control method, a controller, an induction cooker, and a readable storage medium, which can be applicable to the application scenarios of rapid movement and slow movement of the cookware, and can control the induction cooker more precisely to improve the safety and reliability of the induction cooker during operation.

[0005] In a first aspect, the embodiments of the present application provide a working state control method applied to an induction cooker. The induction cooker includes a coil and a switching tube. The first end of the coil is connected to a DC power supply, the second end of the coil is connected to the first end of the switching tube at a first node, and the second end of the switching tube is grounded. The method includes: when the working power of the induction cooker is the target working power, obtaining the target working frequency of the switching tube and the target working current flowing through the switching tube, where the target working current is the current flowing from the first end of the switching tube to the second end of the switching tube; when the induction cooker is working, obtaining the current working frequency of the switching tube and the current working current flowing through the switching tube; when the absolute value of the difference between the target working frequency and the current working frequency is greater than a preset frequency threshold, controlling the induction cooker to continue working or stop working according to the comparison result between the target working current and the current working current.

[0006] In one or more embodiments, controlling the induction cooker to continue working or stop working according to the comparison result between the target working current and the current working current includes: when the absolute value of the difference between the target working current and the current working current is less than or equal to a preset current threshold, controlling the induction cooker to continue working.

[0007] In one or more embodiments, the method further includes: after controlling the induction cooker to keep working, returning to execute the steps of obtaining the current working frequency of the switching tube and the current working current flowing through the switching tube and subsequent steps when the induction cooker is working.

[0008] In one or more embodiments, controlling the induction cooker to keep working or stop working according to the comparison result between the target working current and the current working current includes: when the absolute value of the difference between the target working current and the current working current is greater than a preset current threshold, controlling the induction cooker to stop working.

[0009] In one or more embodiments, the method further includes: when the absolute value of the difference between the target working frequency and the current working frequency is less than or equal to a preset frequency threshold, controlling the induction cooker to keep working.

[0010] In one or more embodiments, the method further includes: when the induction cooker is working, obtaining the first voltage of the first node; according to the first voltage, obtaining the duration of the low level in the period of the signal for driving the switching tube; and according to the duration of the low level in the period of the signal for driving the switching tube, obtaining the working frequency of the switching tube.

[0011] In a second aspect, an embodiment of the present application provides a controller, including:

[0012] At least one processor and a memory communicatively connected to the at least one processor, where the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the working state control method as described above.

[0013] In a third aspect, an embodiment of the present application provides an induction cooker, including the controller as described above.

[0014] In one or more embodiments, the induction cooker further includes a resonant capacitor and a filter capacitor; the resonant capacitor is connected in parallel with the wire coil, the filter capacitor is connected between the DC power supply and the ground, and the switching tube is also connected to the controller.

[0015] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and when the computer program is executed, the working state control method as described above is implemented.

[0016] The beneficial effects of the present application are as follows: The working state control method of the embodiment of the present application is applied to an induction cooker. The induction cooker includes a coil disk and a switching tube. The first end of the coil disk is connected to a DC power supply, the second end of the coil disk is connected to the first end of the switching tube at a first node, and the second end of the switching tube is grounded. The method includes: when the working power of the induction cooker is the target working power, obtaining the target working frequency of the switching tube and the target working current flowing through the switching tube, where the target working current is the current flowing from the first end of the switching tube to the second end of the switching tube; when the induction cooker is working, obtaining the current working frequency of the switching tube and the current working current flowing through the switching tube; when the absolute value of the difference between the target working frequency and the current working frequency is greater than a preset frequency threshold, controlling the induction cooker to continue working or stop working according to the comparison result between the target working current and the current working current. Thus, after it is determined that the cookware has moved based on the fact that the absolute value of the difference between the target working frequency and the current working frequency is greater than the preset frequency threshold, it is then accurately determined whether the cookware is moving quickly or slowly according to the comparison result between the target working current and the current working current, and further, the induction cooker can be controlled more precisely to improve the safety and reliability of the induction cooker during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] One or more embodiments are illustrated by way of example in the accompanying drawings, which are not intended to limit the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements.

[0018] Figure 1 is a schematic structural diagram of an induction cooker provided by an embodiment of the present application;

[0019] Figure 2 is a flowchart of the working state control method provided by an embodiment of the present application Figure 1 ;

[0020] Figure 3 is provided by an embodiment of the present application Figure 2 is a schematic diagram of an embodiment of step 203 shown in

[0021] Figure 4 is provided by an embodiment of the present application Figure 2 is a schematic diagram of another embodiment of step 203 shown in

[0022] Figure 5 is a flowchart of the working state control method provided by an embodiment of the present application Figure 2 ;

[0023] Figure 6 is a flowchart of the step of obtaining the working frequency of the switching tube provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and detailedly describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0025] It should be noted that when an element is expressed as "connected" to another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween.

[0026] In addition, the technical features involved in the various embodiments of this application described below can be combined with each other as long as there is no conflict between them.

[0027] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the induction cooker provided by the embodiment of this application. As Figure 1 shown, the induction cooker 100 includes a wire coil LA1, a switching transistor QA1, and a controller 10 for controlling the switching transistor QA1.

[0028] The first end of the wire coil LA1 is connected to the DC power supply 200, and the second end of the wire coil LA1 is connected to the first end of the switching transistor QA1 at the first node P1. The wire coil LA1 is a coil or disk-shaped coil for generating electromagnetic induction heating. The wire coil LA1 can be made of a conductive material, usually copper or aluminum, and it generates an alternating current through energization, thereby generating an alternating magnetic field around the disk-shaped coil. When a conductive material (such as a cooking utensil) is placed in this magnetic field, eddy currents will be generated, resulting in heating of the material. Among them, in some embodiments, the DC power supply 200 is obtained by full-wave rectification of industrial-frequency alternating current.

[0029] The second end of the switching transistor QA1 is grounded to GND, and the third end of the switching transistor QA1 is connected to the controller 10. The switching transistor QA1 is alternately turned on and off under the control of the pulse-width modulation signal output by the controller 10. Among them, Pulse Width Modulation (PWM) is a technology for adjusting the duty cycle of a pulse signal. The PWM signal is a signal that alternately switches between high and low levels. In this embodiment, when the PWM signal is at a high level, the switching transistor QA1 is turned on; when the PWM signal is at a low level, the switching transistor QA1 is turned off.

[0030] Among them, in this embodiment, taking the switching transistor QA1 as an IGBT switching transistor as an example. The collector of the IGBT switching transistor is the first end of the switching transistor QA1, the emitter of the IGBT switching transistor is the second end of the switching transistor QA1, and the gate of the IGBT switching transistor is the third end of the switching transistor QA1.

[0031] In addition, the switching transistor QA1 can be any controllable switch, for example, an integrated gate-commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field effect transistor (JFET) device, a MOS controlled thyristor (MCT) device, etc.

[0032] The controller 10 can adopt a microcontroller unit (MCU) or a digital signal processing (DSP) controller, etc.

[0033] The controller 10 includes at least one processor 11 and a memory 12. Among them, the memory 12 can be built into the controller 10 or external to the controller 10. The memory 12 can also be a remotely set memory, which is connected to the controller 10 through a network.

[0034] As a non-volatile computer-readable storage medium, the memory 12 can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The memory 12 can include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the terminal, etc. In addition, the memory 12 can include high-speed random access memory and can also include non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices. In some embodiments, the memory 12 optionally includes a memory remotely set relative to the processor 11, and these remote memories can be connected to the terminal through a network. Examples of the above network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0035] By running or executing the software programs and / or modules stored in the memory 12, and by calling the data stored in the memory 12, the processor 11 executes various functions of the terminal and processes data, thereby performing overall monitoring of the terminal, for example, implementing the working state control method described in any embodiment of the present application.

[0036] The processor 11 can be one or more. Figure 1 Taking one processor 11 as an example. The processor 11 and the memory 12 can be connected through a bus or other means. The processor 11 can include a central processing unit (CPU), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a controller, a field programmable gate array (FPGA) device, etc. The processor 11 can also be implemented as a combination of computing devices. For example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration.

[0037] In some embodiments, the induction cooker 100 further includes a resonance capacitor CA1 and a filter capacitor CA2.

[0038] Among them, the resonance capacitor CA1 is connected in parallel with the wire coil LA1. The resonance capacitor CA1 is used to form resonance with the wire coil LA1 to achieve the heating process. The filter capacitor CA2 is connected between the DC power supply 200 and the ground GND. The filter capacitor CA2 is used to filter the DC power supply 200.

[0039] Specifically, after the DC power supply 200 is powered on, it charges the filter capacitor CA2. During the time period corresponding to one cycle of the pulse width modulation signal, when the switching transistor QA1 is turned on, current flows through the wire coil LA1, and the filter capacitor CA2 releases current to the wire coil LA1, and energy is stored on the wire coil LA1; when the switching transistor QA1 is turned off, the wire coil LA1 charges the resonance capacitor CA1, and after the resonance capacitor CA1 is fully charged, it discharges reversely to the wire coil LA1 to form a resonance process between the wire coil LA1 and the resonance capacitor CA1. During the resonance process, energy exists in the form of current in the wire coil LA1 and in the form of voltage in the resonance capacitor CA1. During the resonance process, an electromagnetic field is generated to heat the iron cookware.

[0040] In some embodiments, the induction cooker 100 further includes a resistor RA1. The resistor RA1 is connected between the second end of the switching transistor QA1 and the ground GND. The resistor RA1 is used for current limiting.

[0041] Please refer to Figure 2 , Figure 2 which is a flowchart of the working state control method provided by the embodiment of the present application. Among them, the working state control method is applied to an induction cooker. The induction cooker includes a wire coil and a switching transistor. The first end of the wire coil is connected to the DC power supply, and the second end of the wire coil is connected to the first end of the switching transistor at a first node. The second end of the switching transistor is grounded. The specific structure of the induction cooker can refer to the description of Figure 1 , and will not be elaborated here. As Figure 2 shown, the working state control method includes the following method steps:

[0042] Step 201: When the working power of the induction cooker is the target working power, obtain the target working frequency of the switching transistor and the target working current flowing through the switching transistor, where the target working current is the current flowing from the first end of the switching transistor to the second end of the switching transistor.

[0043] Among them, the operating power of the induction cooker being the target operating power can mean that the operating power of the induction cooker is equal to the target operating power, or that the absolute value of the difference between the operating power of the induction cooker and the target operating power is less than a preset power threshold. Here, the preset power threshold is a power threshold set in advance, which can be set based on the actual application scenario, and the embodiments of the present application do not make specific limitations on this. For example, in some embodiments, the preset power threshold is set to any value between 1W and 5W.

[0044] Specifically, starting from when the induction cooker starts working, the operating power of the induction cooker gradually increases until the operating power of the induction cooker is the target operating power. At this time, the induction cooker enters a stable working state. On the premise that no abnormal situation occurs (such as the cookware moving), the induction cooker should maintain the current working state unchanged. Obtain the operating frequency of the switching transistor QA1 at this time and record it as the target operating frequency; obtain the current flowing through the switching transistor QA1 at this time and record it as the target operating current. Among them, the operating frequency of the switching transistor QA1 is the frequency of the pulse width modulation signal output by the controller 10; the current flowing through the switching transistor QA1 is the current flowing from the first end of the switching transistor QA1 to the second end of the switching transistor QA1, that is, the current flowing from the first node P1 through the switching transistor QA1 and flowing to the ground GND.

[0045] Step 202: When the induction cooker is working, obtain the current operating frequency of the switching transistor and the current flowing through the switching transistor.

[0046] Among them, the current operating frequency of the switching transistor QA1 is the operating frequency of the switching transistor QA1 obtained currently; the current flowing through the switching transistor QA1 currently is the current flowing through the switching transistor QA1 obtained currently. In some embodiments, when the induction cooker is working, the operating frequency of the switching transistor QA1 and the current flowing through the switching transistor QA1 can be obtained in real time. In some embodiments, when the induction cooker is working, the operating frequency of the switching transistor QA1 and the current flowing through the switching transistor QA1 can be obtained at intervals of a period of time.

[0047] Step 203: When the absolute value of the difference between the target operating frequency and the current operating frequency is greater than a preset frequency threshold, control the induction cooker to continue working or stop working according to the comparison result between the target operating current and the current operating current.

[0048] Specifically, based on the currently obtained operating frequency and current, combined with the target operating frequency and target operating current, it is possible to more accurately determine whether the cookware has moved and the specific situation of the movement (such as rapid movement or slow movement), and then precisely control the induction cooker.

[0049] Among them, the preset frequency threshold is a pre-set frequency threshold, which can be set based on the actual application scenario, and the embodiments of the present application do not make specific limitations on this. For example, in a specific embodiment, the preset frequency threshold is set to A% of the target operating frequency, where A is any value between 5 and 10.

[0050] According to the absolute value of the difference between the target operating frequency and the current operating frequency and the preset frequency threshold, it is possible to determine whether the cookware has moved. Among them, when the absolute value of the difference between the target operating frequency and the current operating frequency is greater than the preset frequency threshold, it is determined that the cookware has moved.

[0051] Then, based on the comparison result of the target operating current and the current operating current, it is possible to more accurately determine whether the cookware is moving quickly or slowly, and then accurately control the induction cooker to keep working or stop working, which is beneficial to improving the safety and reliability of the induction cooker during operation.

[0052] In some embodiments, as Figure 3 shown, the specific implementation process of controlling the induction cooker to keep working or stop working according to the comparison result of the target operating current and the current operating current in step 203 includes the following method steps:

[0053] Step 301: When the absolute value of the difference between the target operating current and the current operating current is less than or equal to the preset current threshold, control the induction cooker to keep working.

[0054] Among them, the preset current threshold is a pre-set current threshold, which can be set based on the actual application scenario, and the embodiments of the present application do not make specific limitations on this.

[0055] Specifically, when the cookware moves slowly (such as slow translation or slow lifting), the heating area of the induction cooker for the cookware will necessarily decrease slowly, which will cause the current flowing through the switching transistor QA1 to decrease slowly. However, due to the existence of the constant power regulation process preset in the controller 10, the controller 10 will have enough time to increase the high-level duration (denoted as TON) of the pulse width modulation signal in one cycle to increase the current so as to maintain the constant working power of the induction cooker. In this case, since the increase in the high-level duration TON will cause an increase in the resonant energy of the resonant process, the resonant time is shortened, that is, the low-level duration (denoted as TOFF) of the pulse width modulation signal in one cycle is shortened. However, the increased part of the high-level duration TON and the shortened part of the low-level duration TOFF are not equal, which leads to the change (usually a decrease) of the current overall frequency (i.e., the frequency of the pulse width modulation signal), and also makes the absolute value of the difference between the target working frequency and the current working frequency greater than the preset frequency threshold. It can be seen that in this case, if only judged based on the target working frequency and the current working frequency, it will inevitably lead to misjudgment and cause the induction cooker to stop working by mistake.

[0056] In the embodiment of the present application, it is further judged by combining the target working current and the current working current, which can avoid the above misjudgment to ensure the stable operation of the induction cooker during normal use and improve the user experience. Specifically, since the cookware moves slowly, based on the constant power regulation process in the controller 10, the working power of the induction cooker can be kept unchanged, so it can be considered that the current flowing through the switching transistor QA1 also remains basically unchanged, that is, the absolute value of the difference between the target working current and the current working current is less than or equal to the preset current threshold. In this case, the induction cooker should be controlled to keep working. For example, when the user accidentally touches the cookware, although it may cause the absolute value of the difference between the target working frequency and the current working frequency to be greater than the preset frequency threshold, since the absolute value of the difference between the target working current and the current working current is less than or equal to the preset current threshold, the induction cooker is controlled to keep heating, which meets the requirements of the actual application scenario.

[0057] Among them, the constant power regulation process preset in the controller 10 is common knowledge in the art and is within the easy understanding range of those skilled in the art, so it will not be elaborated here.

[0058] In some embodiments, after controlling the induction cooker to keep working in step 301, return to execute step 202 and its subsequent steps. Thus, continue to combine the target working frequency, the current working frequency, the target working current and the current working current to control the induction cooker to keep working or stop working, so as to ensure the safety and reliability of the induction cooker operation in real time.

[0059] In some embodiments, such as Figure 3As shown, the specific implementation process of controlling the induction cooker to keep working or stop working according to the comparison result between the target working current and the current working current in step 203 includes the following method steps:

[0060] Step 401: When the absolute value of the difference between the target working current and the current working current is greater than the preset current threshold, control the induction cooker to stop working.

[0061] For the case where the cookware moves slowly, when the cookware moves to the position where it really needs to stop working, it will inevitably be unable to continue with a constant power at this time, because the pulses of the pulse width modulation signal cannot be adjusted continuously (it can be understood that induction cookers usually have a maximum pulse width limit, such as 25 us). Specifically, because the high-level duration TON cannot increase indefinitely to make up for the current reduction caused by the loss of the heating area, and at the same time, if the high-level duration TON is too large, it will also cause damage to the switching transistor QA1. Then, when the high-level duration TON reaches the maximum value and cannot be adjusted any further, and the cookware is moved again, there will be a significant drop in current. That is to say, in this case, the current working current will change significantly, which in turn causes the absolute value of the difference between the target working current and the current working current to be greater than the preset current threshold. At this time, it can be determined that the cookware has moved away from the heating range of the induction cooker. If the induction cooker is used to heat the cookware again, it may cause safety hazards such as overheating, equipment damage or fire. Based on this, the induction cooker is controlled to stop heating.

[0062] For the case where the cookware moves quickly (such as quickly translating or quickly lifting), the constant power adjustment process in the controller 10 does not have enough time to adjust the pulse width modulation signal. That is, the high-level duration in one cycle of the pulse width modulation signal can be considered to remain unchanged, while the low-level duration TOFF changes significantly, which not only causes the absolute value of the difference between the target working frequency and the current working frequency to be greater than the preset frequency threshold, but also causes the absolute value of the difference between the target working current and the current working current to be greater than the preset current threshold. At this time, it can also be determined that the cookware has moved away from the heating range of the induction cooker. If the induction cooker is used to heat the cookware again, it may cause safety hazards such as overheating, equipment damage or fire. Based on this, the induction cooker is controlled to stop heating.

[0063] In summary, through the above process, it is possible to determine more accurately whether the cookware moves quickly or slowly, and then be able to accurately control the induction cooker to keep working or stop working, and be able to turn off the induction cooker in time to reduce safety hazards, which is beneficial to improving the safety and reliability of the induction cooker.

[0064] In some embodiments, the working state control method further includes the following method steps: when the absolute value of the difference between the target working frequency and the current working frequency is less than or equal to the preset frequency threshold, control the induction cooker to keep working.

[0065] If the absolute value of the difference between the target operating frequency and the current operating frequency is less than or equal to the preset frequency threshold, it can be determined that the pot has not moved, and the induction cooker can be controlled to keep working.

[0066] Please refer to Figure 5 , Figure 5 This is a flow chart of a method for determining a working state provided by another embodiment of the present application. Figure 5 As shown, first, when the induction cooker is working stably, the target working frequency of the switch tube and the target working current flowing through the switch tube are obtained, wherein the working power of the induction cooker corresponding to the stable working of the induction cooker is the target working power. Afterwards, when the induction cooker is working, the current working frequency of the switch tube and the current working current flowing through the switch tube are obtained. Next, it is determined whether the absolute value of the difference between the target working frequency and the current working frequency is greater than the preset frequency threshold. If the absolute value of the difference between the target working frequency and the current working frequency is less than or equal to the preset frequency threshold, it is determined that the pot has not been moved, and the induction cooker is controlled to keep working; if the absolute value of the difference between the target working frequency and the current working frequency is greater than the preset frequency threshold, it is determined that the pot has been moved, and then it is determined whether the absolute value of the difference between the target working current and the current working current is less than or equal to the preset current threshold. If the absolute value of the difference between the target working current and the current working current is greater than the preset current threshold, it is determined that the pot has been away from the heating range of the induction cooker, and the induction cooker should be controlled to stop working to prevent abnormalities such as overheating, equipment damage or fire. If the absolute value of the difference between the target working current and the current working current is less than or equal to the preset current threshold, it is determined that the cookware is moving slowly and is not far away from the heating range of the induction cooker, that is, the cookware is still within the range of the induction cooker that can be heated normally. At this time, the induction cooker should be controlled to keep working. At the same time, continue to return to execute the step of obtaining the current working frequency of the switch tube and the current working current flowing through the switch tube when the induction cooker is working and its subsequent steps, so as to detect the condition of the cookware in real time and adjust the working state of the induction cooker in real time according to the actual situation of the cookware.

[0067] In the above process, firstly, by monitoring the change of the working frequency, the displacement or lifting of the pot can be judged more accurately and sensitively. Secondly, by combining the working frequency and the working current for judgment, it is possible to reduce misjudgment, ensure the stable operation of the induction cooker during normal use, and improve the user experience. Furthermore, since the induction cooker can be controlled to stop working in time when the pot is away from the heating range of the induction cooker, it can prevent misoperation or safety hazards caused by the displacement or lifting of the pot.

[0068] In some embodiments, Figure 6 As shown, the working state control method also includes the following method steps:

[0069] Step 601: When the induction cooker is working, obtain the first voltage of the first node.

[0070] Among them, the first node P1 is the connection point between the resonance capacitor CA1 and the switching tube QA1.

[0071] Step 602: According to the first voltage, obtain the duration of the low level in the period of the signal for driving the switching tube.

[0072] Specifically, according to the voltage of the first node P1 (i.e., the first voltage), the time of each resonance process between the coil LA1 and the resonance capacitor CA1 can be obtained, and this time is the duration TOFF of the low level in a period of the signal for driving the switching tube (i.e., the pulse width modulation signal in the above embodiment).

[0073] Step 603: According to the duration of the low level in the period of the signal for driving the switching tube, obtain the operating frequency of the switching tube.

[0074] Specifically, according to the target operating power of the induction cooker and the voltage of the DC power supply 200, the target operating current flowing through the switching tube QA1 can be determined. Based on this target operating power, the duration TON of the high level in the period of the signal for driving the switching tube can be determined. It can be understood that the longer the duration TON of the high level, the greater the current flowing through the switching tube QA1, that is, there is a corresponding relationship between the duration TON of the high level and the current flowing through the switching tube QA1. Therefore, based on the target operating power, the duration TON of the high level can be determined. The sum of the duration TOFF of the low level and the duration TON of the high level is the operating frequency of the switching tube QA1.

[0075] The embodiment of the present application also provides a non-volatile computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are executed, the working state control method in any embodiment of the present application is implemented.

[0076] The embodiment of the present application also provides a computer program product. The computer program product includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer is made to execute the working state control method in any of the above embodiments.

[0077] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

[0078] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; under the idea of the present application, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. Those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A working state control method, applied to an induction cooker, the induction cooker comprising a wire reel and a switch tube, the first end of the wire reel is connected to a DC power supply, the second end of the wire reel and the first end of the switch tube are connected to a first node, the second end of the switch tube is grounded, characterized in that: The method comprises: When the working power of the induction cooker is the target working power, obtaining the target working frequency of the switch tube and the target working current flowing through the switch tube, wherein the target working current is the current flowing from the first end of the switch tube to the second end of the switch tube; When the induction cooker is working, obtaining the current operating frequency of the switch tube and the current operating current flowing through the switch tube; When the absolute value of the difference between the target operating frequency and the current operating frequency is greater than a preset frequency threshold, the induction cooker is controlled to keep working or stop working according to a comparison result between the target operating current and the current operating current.

2. The method according to claim 1, characterized in that The controlling the induction cooker to keep working or stop working according to the comparison result between the target working current and the current working current comprises: When the absolute value of the difference between the target working current and the current working current is less than or equal to a preset current threshold, the induction cooker is controlled to keep working.

3. The method according to claim 2, characterized in that The method further comprises: After controlling the induction cooker to keep working, returning to execute the step of obtaining the current working frequency of the switch tube and the current working current flowing through the switch tube when the induction cooker is working and its subsequent steps.

4. The method according to claim 1, characterized in that The controlling the induction cooker to keep working or stop working according to the comparison result between the target working current and the current working current comprises: When the absolute value of the difference between the target working current and the current working current is greater than a preset current threshold, the induction cooker is controlled to stop working.

5. The method according to claim 1, characterized in that The method further comprises: When the absolute value of the difference between the target operating frequency and the current operating frequency is less than or equal to a preset frequency threshold, the induction cooker is controlled to keep operating.

6. The method according to claim 1, characterized in that The method further comprises: When the induction cooker is working, obtaining a first voltage of the first node; According to the first voltage, acquiring a duration of a low level in a cycle of a signal driving the switch tube; The operating frequency of the switch tube is obtained according to the duration of the low level in the cycle of the signal driving the switch tube.

7. A controller, characterized in that: include: At least one processor and a memory communicatively connected to the at least one processor, the memory storing instructions executable by the at least one processor, the instructions being executed by the at least one processor so that the at least one processor can execute the working status control method as described in any one of claims 1-6.

8. An induction cooker, characterized in that: Comprising a controller as claimed in claim 7.

9. The induction cooker according to claim 8, characterized in that: The induction cooker also includes a resonant capacitor and a filter capacitor; The resonant capacitor is connected in parallel with the wire drum, the filter capacitor is connected between the DC power supply and the ground, and the switch tube is also connected with the controller.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed, the working state control method according to any one of claims 1 to 6 is implemented.

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