Induction cooker circuit, method and device for measuring and calculating turn-off time of induction cooker and induction cooker

Abstract

The invention provides an induction cooker circuit, a turn-off time measuring and calculating method and device of an induction cooker and the induction cooker. The turn-off time measuring and calculating method of the induction cooker comprises the steps that the duty ratio of a wave sending unit and the sampling period of a mapping unit are obtained; wherein the sampling period is half of the wave sending period of the wave sending unit, and the duty ratio of the wave sending unit represents the conduction time of the IGBT module; determining the turn-off time of the IGBT module according to the sampling period and the duty ratio; wherein the turn-off time of the IGBT module represents the PPG turn-off time of the induction cooker.

Description

Technical Field

[0001] This invention relates to the field of induction cooker technology, and in particular to an induction cooker circuit, a method for calculating the off-time of an induction cooker, a device for calculating the off-time of an induction cooker, and an induction cooker. Background Technology

[0002] In the field of IH (Induction Heating) induction cooker technology, precise control of the carrier cycle of electromagnetic heating is key to achieving efficient and stable heating. Traditional IH induction cookers use a PPG (Pulse Pattern Generator) as the core control unit, which generates a PWM (Pulse Width Modulation) signal to control the heating power of the induction cooker. However, the PPG's transmission characteristics are unique: the low-level on-time remains fixed, while the high-level off-time is affected by both a complex automatic reload mechanism and the reset signal generated by the comparator COMP0. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, the first objective of this invention is to propose an induction cooker circuit that, by introducing a mapping unit as an auxiliary timer, synchronously maps the internal reference signal of the transmitting unit to the mapping unit, thereby accurately capturing and calculating the entire carrier cycle. Furthermore, the duty cycle of the transmitting unit inside the induction cooker is known; the duty cycle of the transmitting unit reflects the PPG on-time of the induction cooker. Based on this, by subtracting the duty cycle of the transmitting unit from the captured carrier cycle, the PPG off-time of the induction cooker can be determined. This achieves accurate measurement and prediction of the PPG transmitting carrier cycle, providing more precise control parameters for the application layer, thereby significantly improving the heating performance and user experience of the IH induction cooker.

[0004] The second objective of this invention is to provide a method for calculating the off-time of an induction cooker.

[0005] The third objective of this invention is to provide a device for calculating the off-time of an induction cooker.

[0006] The fourth objective of this invention is to provide an induction cooker.

[0007] To achieve the above objectives, a first aspect of the present invention provides an induction cooker circuit, comprising: a rectifier module, the input terminal of which is connected to an AC power supply for converting the AC input of the AC power supply into a DC input; a filter module, the input terminal of which is connected to the output terminal of the rectifier module for filtering the DC input; an IGBT module, the collector of which is connected to the output terminal of the filter module, and the emitter of which is connected to the input terminal of the main heating circuit for controlling the on / off state of the main heating circuit; a control module, comprising a wave generation unit, a sampling unit, an ADC module, and a mapping unit; the output terminal of the wave generation unit is connected to the gate of the IGBT module for providing a drive signal to the IGBT module; the output terminal of the sampling unit is connected to the input terminal of the ADC module for providing a current sampling signal to the ADC module; the output terminal of the ADC module is connected to the emitter of the IGBT module for sampling at the conduction midpoint of the IGBT module to obtain a sampled current value; and a mapping unit connected to the sampling unit for obtaining the sampling period of the sampling unit; wherein the sampling period is half of the wave generation period of the wave generation unit.

[0008] In addition, the induction cooker circuit according to the above embodiments of the present invention may also have the following additional technical features:

[0009] Optionally, the mapping unit includes a capture register, which is used to capture the TAR value of the sampling unit; wherein the TAR value indicates the sampling period of the sampling unit.

[0010] Optionally, the above-mentioned induction cooker circuit also includes a voltage divider circuit. The input terminal of the voltage divider circuit is connected to the output terminal of the rectifier module, and the output terminal of the voltage divider circuit is connected to the input terminal of the control module to provide the control module with a zero-crossing reference value for the DC input.

[0011] Optionally, the sampling unit is configured to generate a sampling signal based on a zero-crossing reference value; wherein the sampling signal characterizes the duty cycle of the transmitting unit.

[0012] Optionally, the control module further includes a calculation unit configured to determine the turn-off time of the IGBT module based on the sampling period and the duty cycle; wherein the turn-off time of the IGBT module characterizes the PPG turn-off time of the induction cooker.

[0013] Optionally, the rectifier module includes a full-bridge rectifier circuit, with the positive input terminal of the full-bridge rectifier circuit connected to the live wire of the AC power supply, the negative input terminal of the full-bridge rectifier circuit connected to the neutral wire of the AC power supply, the positive output terminal of the full-bridge rectifier circuit connected to the positive input terminal of the filter module, and the negative output terminal of the full-bridge rectifier circuit grounded.

[0014] According to the induction cooker circuit provided by the present invention, by introducing a mapping unit as an auxiliary timer, the internal reference signal of the wave-generating unit is synchronously mapped to the mapping unit, thereby accurately capturing and calculating the entire carrier cycle. In addition, the duty cycle of the wave-generating unit inside the induction cooker is known, which reflects the PPG conduction time of the induction cooker. Based on this, the PPG off time of the induction cooker can be determined by subtracting the duty cycle of the wave-generating unit inside the induction cooker from the captured carrier cycle. This achieves accurate measurement and prediction of the PPG wave-generating carrier cycle, providing more precise control parameters for the application layer, thereby significantly improving the heating performance and user experience of the IH induction cooker.

[0015] To achieve the above objectives, a second aspect of the present invention provides a method for calculating the turn-off time of an induction cooker, applied to the aforementioned induction cooker circuit, comprising: acquiring the duty cycle of a wave-emitting unit and the sampling period of a mapping unit; wherein the sampling period is half of the wave-emitting period of the wave-emitting unit, and the duty cycle of the wave-emitting unit characterizes the conduction time of the IGBT module; determining the turn-off time of the IGBT module based on the sampling period and the duty cycle; wherein the turn-off time of the IGBT module characterizes the PPG turn-off time of the induction cooker.

[0016] In addition, the method for calculating the off-time of an induction cooker according to the above embodiments of the present invention may also have the following additional technical features:

[0017] The off-time of the IGBT module is obtained by subtracting the duty cycle from the sampling period.

[0018] According to the present invention, a method for calculating the turn-off time of an induction cooker is provided. By introducing a mapping unit as an auxiliary timer, the internal reference signal of the transmitting unit is synchronously mapped to the mapping unit, thereby accurately capturing and calculating the entire carrier cycle. In addition, the duty cycle of the transmitting unit inside the induction cooker is known, which reflects the PPG conduction time of the induction cooker. Based on this, the PPG turn-off time of the induction cooker can be determined by subtracting the duty cycle of the transmitting unit inside the induction cooker from the captured carrier cycle. This method achieves accurate measurement and prediction of the PPG transmitting carrier cycle, providing more precise control parameters for the application layer, thereby significantly improving the heating performance and user experience of the IH induction cooker.

[0019] To achieve the above objectives, a third aspect of the present invention provides an induction cooker turn-off time calculation device, comprising a control processing unit, the control processing unit comprising: 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 to enable the at least one processor to execute the above-described induction cooker turn-off time calculation method.

[0020] To achieve the above objectives, the fourth aspect of this invention provides an induction cooker including the aforementioned induction cooker circuit. By introducing a mapping unit as an auxiliary timer, the internal reference signal of the wave-generating unit is synchronously mapped to the mapping unit, thereby accurately capturing and calculating the entire carrier cycle. Furthermore, the duty cycle of the wave-generating unit inside the induction cooker is known, which reflects the PPG on-time of the induction cooker. Based on this, the PPG off-time of the induction cooker can be determined by subtracting the duty cycle of the wave-generating unit inside the induction cooker from the captured carrier cycle. This achieves accurate measurement and prediction of the PPG wave-generating carrier cycle, providing more precise control parameters for the application layer, thereby significantly improving the heating performance and user experience of the IH induction cooker.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the internal signals of an induction cooker circuit provided in an embodiment of the present invention.

[0024] Figure 2 A schematic diagram of the circuit structure of an induction cooker provided in an embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the method for calculating the off-time of an induction cooker provided in an embodiment of the present invention.

[0026] Figure 4 A schematic diagram of the induction cooker turn-off time calculation device provided in an embodiment of the present invention.

[0027] Figure 5 A schematic diagram of an induction cooker provided for an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] The system includes a rectifier module 1, a filter module 2, an IGBT module 3, a control module 4, a main heating circuit 5, a wave generation unit 41, a sampling unit 42, an ADC module 43, a mapping unit 44, an induction cooker circuit 200, an induction cooker off-time measurement device 400, and an induction cooker 500. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0031] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] As described in the background section, in the field of IH (Induction Heating) induction cooker technology, precise control of the carrier cycle of electromagnetic heating is key to achieving efficient and stable heating. Traditional IH induction cookers use a PPG (Pulse Pattern Generator) as the core control unit, which controls the heating power of the induction cooker by generating a PWM (Pulse Width Modulation) signal. However, the PPG's transmission characteristics are unique: the low-level on-time remains fixed, while the high-level off-time is affected by both the complex automatic reload mechanism and the reset signal generated by the comparator COMP0.

[0033] In the process of developing this invention, the applicant discovered that this mechanism causes the carrier period of the PWM signal to become random rather than fixed, posing a challenge to the precise control and optimization of the heating process at the application layer. Specifically, due to the randomness of the carrier period, it is difficult to accurately adjust the heating rate and temperature control precision directly through preset parameters, thereby affecting the overall performance of the induction cooker and the user experience.

[0034] Therefore, accurately measuring and predicting the carrier cycle duration of PPG wave emission has become a crucial issue in the research and development of IH induction cooker technology. Currently, there is a lack of an effective and reliable method to accurately calculate the PPG turn-off time in real time, thereby determining the duration of the entire carrier cycle. This not only limits further improvements in heating efficiency and temperature control accuracy of induction cookers but also restricts their widespread application in the field of high-end cooking equipment.

[0035] The technical solution of the present invention will be further described in detail below through specific embodiments.

[0036] refer to Figure 1 This is a schematic diagram of the internal signals of an induction cooker circuit provided in an embodiment of the present invention.

[0037] In the PPG control of an induction cooker, a timer slave mode with a reset function is used to achieve precise PWM (Pulse Width Modulation) output. In timer slave mode, the timer (or counter) operates as a slave device, its operation controlled by instructions from the master controller (such as a microprocessor). The timer can be configured in multiple modes, including a reset mode, where it automatically resets and starts a new counting cycle when a certain condition is met (such as the count value reaching a preset value or receiving an external signal). When a synchronization signal arrives, the timer (CNT) is cleared, which can be understood as the current counting cycle being interrupted, and a new counting cycle immediately starting. This mechanism ensures the synchronization of the PWM output, meaning the PWM signal generation is strictly aligned with the synchronization signal. PWMOUT is the output port of the PWM signal, and its level (high or low) determines the switching state of the IGBT (Insulated Gate Bipolar Transistor). In an induction cooker, a high level typically indicates that the IGBT is turned on, thus heating the induction cooker; a low level indicates that the IGBT is turned off, stopping heating. The timer starts counting after reset. When the count reaches a preset value (i.e., the conduction time determined by the duty cycle of the PWM signal), PWMOUT outputs a high level, driving the IGBT to conduct. Subsequently, if the timer continues counting until it reaches another preset value (i.e., the entire PWM cycle time), PWMOUT outputs a low level, turning off the IGBT. However, in the PPG control of an induction cooker, due to the presence of a synchronization signal, this process is interrupted when the synchronization signal arrives. The timer is reset and restarts counting, thus regenerating the high-level PWMOUT signal. This control mechanism allows the induction cooker to precisely control heating power and timing based on external synchronization signals (such as the phase of the mains voltage, operating signals from other devices, etc.). This helps reduce electromagnetic interference, improve energy efficiency, and ensure compatibility between the induction cooker and other kitchen appliances.

[0038] Specifically, from Figure 1As can be seen, CPOOUT (PWM output port) is connected to PWMOUT (Pulse Width Modulation Output) via ARR (Automatic Reload Register) and CCR (Capture / Compare Register). This connection method is very typical in the control system of induction cookers, used to precisely control the switching time of heating elements (such as IGBTs) to achieve stable temperature control and energy saving. PWM (Pulse Width Modulation) technology plays a key role here. By adjusting the duty cycle of the PWM signal (i.e., the proportion of high-level time to the total cycle time), the heating power of the induction cooker can be controlled. When it is necessary to increase the heating power, the duty cycle of the PWM signal is increased; conversely, when it is necessary to decrease the heating power or maintain temperature stability, the duty cycle is decreased. Synchronization signals are usually used to ensure coordinated operation between different control units and prevent interference or errors caused by timing inconsistencies. In induction cookers, synchronization signals are used to synchronize the generation of PWM signals and the switching action of heating elements to ensure system stability and reliability. CEN (Power Control Port) is connected to PWMOUT and is used to control the enabling / disabling of the entire PWM output circuit. In this way, when the induction cooker is in standby or off state, the PWM output can be cut off by turning off CEN, which further saves energy and extends the life of the equipment.

[0039] Based on the application scenarios of the HI induction cooker of this invention, this invention can achieve precise heating power control and temperature stability. By adjusting the duty cycle of the PWM signal and coordinating the synchronization signal, the heating effect of the induction cooker in different cooking modes can be ensured, meeting users' requirements for food heating speed and temperature accuracy.

[0040] refer to Figure 2 This is a schematic diagram of the circuit structure of an induction cooker provided in an embodiment of the present invention.

[0041] The induction cooker circuit 200 provided by the present invention mainly includes a rectifier module 1, a filter module 2, an IGBT module 3, and a control module 4.

[0042] The input terminal of rectifier module 1 is connected to the AC power supply to convert the AC input of the AC power supply into DC input; the input terminal of filter module 2 is connected to the output terminal of rectifier module 1 to filter the DC input; the collector of IGBT module 3 is connected to the output terminal of filter module 2, and the emitter of IGBT module 3 is connected to the input terminal of main heating circuit 5 to control the on / off state of main heating circuit 5.

[0043] The control module 4 includes a wave generation unit 41, a sampling unit 42, an ADC module 43, and a mapping unit 44. The output terminal of the wave generation unit 41 is connected to the gate of the IGBT module 3 to provide a drive signal for the IGBT module 3. The output terminal of the sampling unit 42 is connected to the input terminal of the ADC module 43. The mapping unit 44 is connected to the sampling unit 42 to obtain the sampling period of the sampling unit 42. The sampling period is half of the wave generation period of the wave generation unit 41.

[0044] The induction cooker circuit provided by this invention introduces a mapping unit as an auxiliary timer to synchronously map the internal reference signal of the wave-generating unit to the mapping unit, thereby accurately capturing and calculating the entire carrier cycle. In addition, the duty cycle of the wave-generating unit inside the induction cooker is known, which reflects the PPG conduction time of the induction cooker. Based on this, the PPG off time of the induction cooker can be determined by subtracting the duty cycle of the wave-generating unit inside the induction cooker from the captured carrier cycle. This achieves accurate measurement and prediction of the PPG wave-generating carrier cycle, providing more precise control parameters for the application layer, thereby significantly improving the heating performance and user experience of the IH induction cooker.

[0045] As an optional embodiment, the induction cooker circuit 200 also includes a voltage divider circuit. The input terminal of the voltage divider circuit is connected to the output terminal of the rectifier module 1, and the output terminal of the voltage divider circuit is connected to the input terminal of the control module 4, for providing the control module 4 with a zero-crossing reference value for the DC input.

[0046] As an optional embodiment, the rectifier module 1 includes a full-bridge rectifier circuit. The positive input terminal of the full-bridge rectifier circuit is connected to the live wire of the AC power supply, the negative input terminal of the full-bridge rectifier circuit is connected to the neutral wire of the AC power supply, the positive output terminal of the full-bridge rectifier circuit is connected to the positive input terminal of the filter module 2, and the negative output terminal of the full-bridge rectifier circuit is grounded.

[0047] Specifically, rectifier module 1 converts the AC input (such as mains power, typically 220V) into DC input, providing a stable DC power supply for subsequent circuits. Optionally, rectifier module 1 can employ a full-bridge rectifier circuit, which effectively converts alternating positive and negative AC power into unidirectional DC power. The positive and negative input terminals of the full-bridge rectifier circuit are connected to the live and neutral wires of the AC power supply, respectively, while the output terminal is connected to filter module 2.

[0048] The DC input after being processed by rectifier module 1 is a "steamer wave". Filter module 2 filters the DC output of rectifier module 1 to remove the pulsating component and obtain a smoother DC.

[0049] IGBT module 3 is an Insulated-Gate Bipolar Transistor (IGBT), which serves as a switching element to control the on / off state of the main heating circuit 5. Its collector receives filtered DC power, while its emitter is connected to the input terminal of the main heating circuit 5. Its gate receives a drive signal from the wave generation unit 41 of the control module 4, and controls the on / off state based on the high or low level of the signal.

[0050] As an optional embodiment, sampling unit 42 is configured to generate a sampling signal based on a zero-crossing reference value; wherein the sampling signal characterizes the duty cycle of the transmitting unit.

[0051] In this embodiment of the invention, the zero-crossing reference value is the zero-crossing point of the rectified "bun wave" collected by the voltage divider circuit. The zero-crossing reference value instructs the ADC module 43 to open the sampling channel and sample the current of the emitter of the IGBT module 3. The current and voltage in the circuit are sampled synchronously by the voltage divider circuit and the ADC module 43.

[0052] As an optional embodiment, the mapping unit 44 includes a capture register for capturing the TAR value of the sampling unit 42; wherein the TAR value indicates the sampling period of the sampling unit 42.

[0053] Specifically, the waveform generation unit 41 is the waveform generation timer, the sampling unit 42 is the sampling timer, and the mapping module is the auxiliary timer, i.e., a general-purpose timer, including the capture / compare register CCRx. The register of the waveform generation unit 41 is CCR2, and the register of the sampling unit 42 is CCR4. The waveform generation unit 41 / CCR1 controls the signal that generates the PFM waveform, and the sampling unit 42 / CCR4 controls the generation of ADC trigger sampling and the input capture of the mapping module / CCR4. Each time CCR4 captures, the CNT count is latched in the CCR register. The difference between two captures is the current PWM period (i.e., the TAR value). CCR4 is half of CCR2, meaning that CCR4 is taken at the conduction midpoint of IGBT module 3. Each time the sampling unit 42 / CCR4 generates an ADC sampling request, the ADC will sample all analog channels at once. In other words, CCR2 = 2 × CCR4, responsible for providing internal input capture for TIM2 to obtain the period values ​​of CCR2 and CCR4.

[0054] As an optional embodiment, the control module 4 further includes a calculation unit configured to acquire the duty cycle of the emitting unit and the sampling period of the mapping unit; wherein the sampling period is half of the emitting period of the emitting unit, and the duty cycle of the emitting unit characterizes the on-time of the IGBT module; and the off-time of the IGBT module is determined based on the sampling period and the duty cycle; wherein the off-time of the IGBT module characterizes the PPG off-time of the induction cooker.

[0055] As can be seen from the above, this invention achieves accurate measurement and prediction of the PPG wave carrier period through innovative algorithms and circuit design, providing more precise control parameters for the application layer, thereby significantly improving the heating performance and user experience of IH induction cookers.

[0056] Based on the same inventive concept, corresponding to the induction cooker circuit provided in any of the above embodiments, the present invention also provides a method for calculating the off-time of an induction cooker.

[0057] refer to Figure 3 This is a schematic diagram of the method for calculating the off-time of an induction cooker provided in an embodiment of the present invention.

[0058] Step S301: Obtain the duty cycle of the transmitting unit and the sampling period of the mapping unit; wherein, the sampling period is half of the transmitting period of the transmitting unit, and the duty cycle of the transmitting unit characterizes the conduction time of the IGBT module.

[0059] Step S302: Determine the turn-off time of the IGBT module based on the sampling period and duty cycle; wherein, the turn-off time of the IGBT module characterizes the PPG turn-off time of the induction cooker.

[0060] As an optional embodiment, determining the turn-off time of the IGBT module based on the sampling period and duty cycle includes: subtracting the duty cycle from the sampling period to obtain the turn-off time of the IGBT module.

[0061] Specifically, the purpose of step S301 is to obtain the duty cycle of the emitting unit and the sampling period of the mapping unit. The duty cycle is the proportion of the high-level time in the PWM (Pulse Width Modulation) signal to the entire cycle time. It characterizes the conduction time of the IGBT (Insulated Gate Bipolar Transistor) module. The higher the duty cycle, the longer the IGBT module is on, and the greater the heating power of the induction cooker. The sampling period is the operating cycle of the mapping unit. It can be understood that the emitting cycle of the emitting unit is a complete cycle for controlling the switching state of the IGBT module; therefore, the sampling period is half of this cycle, used to control the generation of the PWM signal at a finer granularity.

[0062] Specifically, the purpose of step S302 is to determine the turn-off time of the IGBT module based on the sampling period and duty cycle. The turn-off time of the IGBT module refers to the duration during which the IGBT module switches from the on state to the off state. In the PPG control of an induction cooker, this turn-off time directly affects the heating power and temperature stability of the induction cooker.

[0063] As an alternative implementation, the turn-off time can be obtained by subtracting the duty cycle from the sampling period. This is because, within a complete PWM cycle, the sum of the IGBT module's on-time (duty cycle) and turn-off time should equal the sampling period. Therefore, by subtracting the duty cycle from the sampling period, the IGBT module's turn-off time within the sampling period can be obtained.

[0064] Steps S301 to S302 determine the on and off times of the IGBT module in the PPG control of the induction cooker, thereby achieving stable control of the heating power and temperature of the induction cooker.

[0065] Furthermore, this application utilizes a mapping unit to record the start and end times of each PWM cycle (or carrier cycle). By integrating over time, the duration of all cycles is accumulated within a preset time period (e.g., 10ms) to calculate the complete electrical cycle (i.e., the fundamental cycle). Time integration is essentially an accumulation process, in which the duration of each PWM cycle is summed. At the end of each PWM cycle, the current value of the mapping unit (representing the duration of that cycle) is read and added to a global variable. This global variable grows over time, reflecting the total time of all PWM cycles since the start of measurement.

[0066] To obtain a complete electrical cycle (i.e., the fundamental cycle), the above accumulation process needs to be performed within a preset time period (e.g., 10ms). After reaching this time point, the total accumulated time can be divided by the number of PWM cycles recorded within that time period to obtain the average duration of each PWM cycle.

[0067] As can be seen from the above, the method for calculating the turn-off time of an induction cooker provided by this invention introduces a mapping unit as an auxiliary timer to synchronously map the internal reference signal of the transmitting unit to the mapping unit, thereby accurately capturing and calculating the entire carrier cycle. In addition, the duty cycle of the transmitting unit inside the induction cooker is known, which reflects the PPG conduction time of the induction cooker. Based on this, the PPG turn-off time of the induction cooker can be determined by subtracting the duty cycle of the transmitting unit inside the induction cooker from the captured carrier cycle. This achieves accurate measurement and prediction of the PPG transmitting carrier cycle, providing more precise control parameters for the application layer, thereby significantly improving the heating performance and user experience of the IH induction cooker.

[0068] It should be noted that the method of this embodiment can be executed by a single device, such as a computer or server. The method of this embodiment can also be applied to a distributed scenario, where multiple devices cooperate to complete the task. In such a distributed scenario, one of these devices may execute only one or more steps of the method of this embodiment, and the multiple devices will interact with each other to complete the method described.

[0069] It should be noted that the above description describes some embodiments of the present invention. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims may be performed in a different order than that shown in the above embodiments and still achieve the desired results. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0070] Based on the same inventive concept, corresponding to the induction cooker turn-off time calculation method provided in any of the above embodiments, the present invention also provides an induction cooker turn-off time calculation device.

[0071] refer to Figure 4 This is a schematic diagram of the induction cooker turn-off time calculation device provided in an embodiment of the present invention.

[0072] The present invention proposes an induction cooker turn-off time calculation device 400, which includes a control processing unit. The control processing unit includes at least one processor and a memory communicatively connected to the at least one processor. The memory stores instructions that can be executed by the at least one processor. The instructions are executed by the at least one processor so that the at least one processor can perform the above-mentioned induction cooker turn-off time calculation method.

[0073] refer to Figure 5 This is a schematic diagram of an induction cooker provided in an embodiment of the present invention.

[0074] The induction cooker 500 includes the induction cooker circuit 200 as described above and has corresponding beneficial effects, which will not be repeated here.

[0075] For ease of description, the above system is described by dividing it into various modules based on their functions. Of course, in implementing this invention, the functions of each module can be implemented in one or more software and / or hardware components.

[0076] The system described in the above embodiments is used to implement the corresponding method in any of the foregoing embodiments and has the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0077] Furthermore, although the operations of the method of the present invention are described in a specific order in the accompanying drawings, this does not require or imply that these operations must be performed in that specific order, or that all of the operations shown must be performed to achieve the desired result. Rather, the steps depicted in the flowchart may be performed in a different order. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

[0078] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0079] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this invention should have the ordinary meaning understood by those skilled in the art. The terms "first," "second," and similar terms used in the embodiments of this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0080] While the spirit and principles of the invention have been described with reference to several specific embodiments, it should be understood that the invention is not limited to the disclosed specific embodiments, and the division of aspects does not imply that features in these aspects cannot be combined for benefit; such division is merely for ease of description. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. The scope of the appended claims is to be interpreted in the broadest sense, thereby encompassing all such modifications and equivalent structures and functions.

Claims

1. An induction cooker circuit, characterized in that, include: A rectifier module (1) is connected to an AC power source for converting the AC input of the AC power source into a DC input. A filter module (2) is provided, the input of which is connected to the output of the rectifier module (1) and is used to filter the DC input. IGBT module (3), the collector of the IGBT module (3) is connected to the output terminal of the filter module (2), and the emitter of the IGBT module (3) is connected to the input terminal of the main heating circuit (5) to control the on / off state of the main heating circuit (5); The control module (4) includes a wave generation unit (41), a sampling unit (42), an ADC module (43), and a mapping unit (44); The output terminal of the wave generation unit (41) is connected to the gate of the IGBT module (3) to provide a drive signal for the IGBT module (3); The output terminal of the sampling unit (42) is connected to the input terminal of the ADC module (43) to provide a current sampling signal to the ADC module (43); The output terminal of the ADC module (43) is connected to the emitter of the IGBT module (3) and is used to sample at the conduction midpoint of the IGBT module (3) to obtain the sampled current value. The mapping unit (44) is connected to the sampling unit (42) and is used to obtain the sampling period of the sampling unit (42); wherein the sampling period is half of the emission period of the emission unit (41).

2. The induction cooker circuit according to claim 1, characterized in that, The mapping unit (44) includes a capture register for capturing the TAR value of the sampling unit (42); wherein the TAR value indicates the sampling period of the sampling unit (42).

3. The induction cooker circuit according to claim 2, characterized in that, It also includes a voltage divider circuit, the input of which is connected to the output of the rectifier module (1), and the output of which is connected to the input of the control module (4), for providing the control module (4) with a zero-crossing reference value for the DC input.

4. The induction cooker circuit according to claim 3, characterized in that, The sampling unit (42) is configured to generate a sampling signal based on the zero-crossing reference value; wherein the sampling signal characterizes the duty cycle of the wave generation unit (41).

5. The induction cooker circuit according to claim 4, characterized in that, The control module (4) further includes a calculation unit configured to determine the turn-off time of the IGBT module (3) based on the sampling period and the duty cycle; wherein the turn-off time of the IGBT module (3) characterizes the PPG turn-off time of the induction cooker.

6. The induction cooker circuit according to claim 1, characterized in that, The rectifier module (1) includes a full-bridge rectifier circuit. The positive input terminal of the full-bridge rectifier circuit is connected to the live wire of the AC power supply. The negative input terminal of the full-bridge rectifier circuit is connected to the neutral wire of the AC power supply. The positive output terminal of the full-bridge rectifier circuit is connected to the positive input terminal of the filter module (2). The negative output terminal of the full-bridge rectifier circuit is grounded.

7. A method for calculating the off-time of an induction cooker, characterized in that, Applied to the induction cooker circuit as described in any one of claims 1-6, comprising: Obtain the duty cycle of the transmitting unit and the sampling period of the mapping unit; wherein the sampling period is half of the transmitting period of the transmitting unit, and the duty cycle of the transmitting unit characterizes the conduction time of the IGBT module. The turn-off time of the IGBT module is determined based on the sampling period and the duty cycle; wherein, the turn-off time of the IGBT module characterizes the PPG turn-off time of the induction cooker.

8. The method for calculating the off-time of an induction cooker according to claim 7, characterized in that, Determining the turn-off time of the IGBT module based on the sampling period and the duty cycle includes: The off-time of the IGBT module is obtained by subtracting the duty cycle from the sampling period.

9. A device for calculating the off-time of an induction cooker, characterized in that, include: A control processing unit, comprising: 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 to enable the at least one processor to execute the method for calculating the off-time of an induction cooker as described in any one of claims 7-8.

10. An induction cooker, characterized in that, Including the induction cooker circuit as described in any one of claims 1-6.

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