Method and device for controlling electromagnetic resonance circuit, electromagnetic oven and storage medium

Abstract

The application provides a control method and device of an electromagnetic resonance circuit, an electromagnetic oven and a storage medium, the electromagnetic resonance circuit comprises a voltage detection circuit, a current detection circuit, a resonance detection circuit and a resonance loop circuit, the control method of the electromagnetic resonance circuit comprises: obtaining a real-time resonance parameter from the resonance detection circuit; obtaining a real-time voltage value from the voltage detection circuit; obtaining a real-time current value from the current detection circuit; obtaining a target level signal flip interval according to the real-time voltage value and the real-time current value; judging a current resonance state of the resonance loop circuit according to the real-time resonance parameter and the target level signal flip interval; and controlling a working parameter of the electromagnetic resonance circuit according to the resonance state. The embodiment of the application can accurately identify the change of the resonance parameter, and can adjust the working parameter in real time according to the resonance state, so that the reliability of the equipment can be effectively improved, the service life of the equipment can be prolonged, and the user experience can be improved.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and in particular to a control method, device, induction cooker, and storage medium for an electromagnetic resonant circuit. Background Technology

[0002] In the application of induction cookers in related technologies, the Insulated Gate Bipolar Transistor (IGBT) is subjected to significant voltage and current stress during normal operation. In actual use, factors such as using cookware of different materials and sizes, and varying placement positions can all cause changes in the resonant parameters of the operating circuit, resulting in changes in the IGBT's operating frequency, current, voltage, and other parameters. When the resonant parameters are in an undesirable state, the probability of IGBT overcurrent damage increases significantly, leading to a decrease in equipment reliability.

[0003] Currently, most induction cookers incorporate conventional protection mechanisms such as voltage and current surge detection, IGBT reverse voltage detection, and IGBT over-temperature protection. While these conventional protections ensure the safe operation of the IGBTs, they only activate after abnormal interference occurs, making their effectiveness largely delayed. In more severe and complex conditions, there is a significant chance of IGBT damage or abnormal power interruptions, impacting the user's normal working experience. Therefore, accurately identifying changes in the resonant parameters of the electromagnetic resonant circuit and adjusting the operating parameters in real time based on the resonant state has become a pressing issue that needs to be addressed. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a control method, device, induction cooker, and storage medium for an electromagnetic resonant circuit, which can accurately identify changes in resonant parameters and adjust operating parameters in real time according to the resonant state, effectively improving equipment reliability, extending equipment lifespan, and enhancing user experience.

[0005] A first aspect of the present invention provides a control method for an electromagnetic resonant circuit, the electromagnetic resonant circuit including a voltage detection circuit, a current detection circuit, a resonance detection circuit, and a resonant loop circuit, wherein the voltage detection circuit is used to detect the mains voltage, the current detection circuit is used to detect the operating current of the electromagnetic resonant circuit, and the resonance detection circuit is used to detect the real-time resonance parameters of the resonant loop circuit, and the control method for the electromagnetic resonant circuit includes:

[0006] Obtain real-time resonance parameters from the resonance detection circuit;

[0007] Obtain the real-time voltage value from the voltage detection circuit;

[0008] Obtain the real-time current value from the current detection circuit;

[0009] The target level signal switching range is obtained based on the real-time voltage value and the real-time current value;

[0010] The current resonance state of the resonant circuit is determined based on the real-time resonance parameters and the target level signal flip-off interval.

[0011] The operating parameters of the electromagnetic resonant circuit are controlled according to the resonant state.

[0012] The control method for an electromagnetic resonant circuit provided by the embodiments of the present invention has at least the following beneficial effects: by setting up a voltage detection circuit, a current detection circuit, a resonance detection circuit, and a resonant circuit, real-time resonance parameters from the resonance detection circuit are obtained, real-time voltage values ​​from the voltage detection circuit are obtained, and real-time current values ​​from the current detection circuit are obtained. The target level signal switching interval is obtained based on the real-time voltage and current values. The current resonance state of the resonant circuit is determined based on the real-time resonance parameters and the target level signal switching interval. The operating parameters of the electromagnetic resonant circuit are controlled according to the resonance state. This method can accurately identify changes in resonance parameters using the electromagnetic resonant circuit and adjust the operating parameters in real time according to the resonance state, effectively improving equipment reliability, extending equipment lifespan, and enhancing user experience.

[0013] In the above-described control method for the electromagnetic resonant circuit, the electromagnetic resonant circuit further includes a power switching device and a comparator. The step of acquiring real-time resonance parameters from the resonance detection circuit includes:

[0014] The voltage value of the resonant circuit is controlled by the power switching device, so that the comparator outputs a trigger level signal according to the voltage value;

[0015] The number of times the trigger level signal flips within a set time is counted to obtain the real-time level signal flip count.

[0016] In the above-mentioned control method for electromagnetic resonant circuit, the voltage value of the resonant circuit includes the DC terminal voltage value and the reverse voltage terminal voltage value, and the trigger level signal includes a low level signal and a high level signal.

[0017] When the DC terminal voltage value is greater than the reverse voltage value, the comparator outputs the low-level signal;

[0018] Alternatively, when the DC terminal voltage value is less than the reverse voltage value, the comparator outputs the high-level signal.

[0019] In the above-described control method for the electromagnetic resonant circuit, obtaining the target level signal switching interval based on the real-time voltage value and the real-time current value includes:

[0020] The real-time power is calculated based on the real-time voltage value and the real-time current value;

[0021] The target level signal switching range is calculated based on the real-time power, the first preset value, and the second preset value.

[0022] In the above-described control method for electromagnetic resonant circuits, the resonant state includes an ideal resonant state and an abnormal resonant state. Determining the current resonant state of the resonant circuit based on the real-time resonant parameters and the target level signal switching interval includes:

[0023] When the number of real-time level signal flips is within the target level signal flip range, it is determined that the resonant circuit is in an ideal resonant state.

[0024] When the number of real-time level signal flips is outside the target level signal flip range, the resonant circuit is determined to be in an abnormal resonance state.

[0025] In the above-described control method for the electromagnetic resonant circuit, the abnormal resonance state includes overdamped resonance state and underdamped resonance state, and the control method for the electromagnetic resonant circuit further includes:

[0026] When the number of real-time level signal flips is greater than the upper limit of the target level signal flip interval, the resonant circuit is determined to be in an overdamped resonance state.

[0027] When the number of real-time level signal flips is less than the lower limit of the target level signal flip interval, the resonant circuit is determined to be in an underdamped resonant state.

[0028] In the above-described control method for an electromagnetic resonant circuit, controlling the operating parameters of the electromagnetic resonant circuit according to the resonance state includes:

[0029] When the resonant circuit is in an ideal resonant state, the electromagnetic resonant circuit is controlled to maintain its current operating state.

[0030] When the resonant circuit is in an abnormal resonance state, adjust the heating power during the heating process of the electromagnetic resonant circuit, or adjust the PPG turn-on time, or adjust the voltage protection value of the power switching device.

[0031] A second aspect of the present invention provides an operation control device, including at least one control processor and a memory for communicatively connecting to the at least one control processor; the memory stores instructions executable by the at least one control processor, the instructions being executed by the at least one control processor to enable the at least one control processor to perform the control method for the electromagnetic resonant circuit described in the first aspect embodiment above.

[0032] The operation control device provided by the embodiments of the present invention has at least the following beneficial effects: by setting up a voltage detection circuit, a current detection circuit, a resonance detection circuit, and a resonance circuit, real-time resonance parameters from the resonance detection circuit are obtained, real-time voltage values ​​from the voltage detection circuit are obtained, and real-time current values ​​from the current detection circuit are obtained. The target level signal switching interval is obtained based on the real-time voltage and real-time current values. The current resonance state of the resonance circuit is determined based on the real-time resonance parameters and the target level signal switching interval. The operating parameters of the electromagnetic resonance circuit are controlled based on the resonance state. The electromagnetic resonance circuit can accurately identify changes in resonance parameters and adjust operating parameters in real time based on the resonance state, which can effectively improve the reliability of the equipment, extend the equipment life, and enhance the user experience.

[0033] A third aspect of the present invention provides an induction cooker, including the operation control device as described in the second aspect of the present invention.

[0034] The induction cooker provided by the embodiments of the present invention has at least the following beneficial effects: by setting a voltage detection circuit, a current detection circuit, a resonance detection circuit, and a resonance circuit, real-time resonance parameters from the resonance detection circuit are obtained, real-time voltage values ​​from the voltage detection circuit are obtained, and real-time current values ​​from the current detection circuit are obtained. The target level signal switching interval is obtained based on the real-time voltage and real-time current values. The current resonance state of the resonance circuit is determined based on the real-time resonance parameters and the target level signal switching interval. The operating parameters of the electromagnetic resonance circuit are controlled based on the resonance state. The electromagnetic resonance circuit can accurately identify changes in resonance parameters and adjust operating parameters in real time according to the resonance state, which can effectively improve the reliability of the equipment, extend the equipment life, and enhance the user experience.

[0035] A fourth aspect of the present invention provides a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the control method for the electromagnetic resonant circuit as described in the first aspect above.

[0036] The computer-readable storage medium provided according to embodiments of the present invention has at least the following beneficial effects: by setting a voltage detection circuit, a current detection circuit, a resonance detection circuit, and a resonance circuit, real-time resonance parameters from the resonance detection circuit are obtained, real-time voltage values ​​from the voltage detection circuit are obtained, and real-time current values ​​from the current detection circuit are obtained. The target level signal switching interval is obtained based on the real-time voltage and current values. The current resonance state of the resonance circuit is determined based on the real-time resonance parameters and the target level signal switching interval. The operating parameters of the electromagnetic resonance circuit are controlled according to the resonance state. This allows for accurate identification of changes in resonance parameters using the electromagnetic resonance circuit, and real-time adjustment of operating parameters based on the resonance state. This effectively improves equipment reliability, extends equipment lifespan, and enhances user experience. Attached Figure Description

[0037] Additional aspects and advantages of the invention will become apparent and readily understood in conjunction with the following description of the embodiments, in which:

[0038] Figure 1 This is a flowchart of a control method for an electromagnetic resonant circuit provided in one embodiment of the present invention;

[0039] Figure 2 This is a circuit diagram of an electromagnetic resonant circuit provided in one embodiment of the present invention;

[0040] Figure 3 This is a circuit diagram of the equivalent circuit of a resonant circuit circuit provided in one embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the operation control device provided in one embodiment of the present invention. Detailed Implementation

[0042] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0043] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0044] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0045] In the application of induction cookers in related technologies, the Insulated Gate Bipolar Transistor (IGBT) is subjected to significant voltage and current stress during normal operation. In actual use, factors such as using cookware of different materials and sizes, and varying placement positions can all cause changes in the resonant parameters of the operating circuit, resulting in changes in the IGBT's operating frequency, current, voltage, and other parameters. When the resonant parameters are in an undesirable state, the probability of IGBT overcurrent damage increases significantly, leading to a decrease in equipment reliability.

[0046] Currently, most induction cookers incorporate conventional protection mechanisms such as voltage and current surge detection, IGBT reverse voltage detection, and IGBT over-temperature protection. While these conventional protections ensure the safe operation of the IGBTs, they only activate after abnormal interference occurs, making their effectiveness largely delayed. In more severe and complex conditions, there is a significant chance of IGBT damage or abnormal power interruptions, impacting the user's normal working experience. Therefore, accurately identifying changes in the resonant parameters of the electromagnetic resonant circuit and adjusting the operating status in real time based on the resonant state has become a pressing issue that needs to be addressed.

[0047] This invention proposes a control method, device, induction cooker, and storage medium for an electromagnetic resonant circuit. It can accurately identify changes in resonance parameters and adjust operating parameters in real time according to the resonance state, which can effectively improve the reliability of the equipment, extend the equipment life, and enhance the user experience.

[0048] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0049] Reference Figures 1 to 2 The first aspect of this invention provides a control method for an electromagnetic resonant circuit. The electromagnetic resonant circuit includes a voltage detection circuit 100, a current detection circuit 200, a resonance detection circuit 300, and a resonant loop circuit 400. The voltage detection circuit 100 is used to detect the mains voltage, the current detection circuit 200 is used to detect the operating current of the electromagnetic resonant circuit, and the resonance detection circuit 300 is used to detect the real-time resonance parameters of the resonant loop circuit 400. The control method for the electromagnetic resonant circuit includes, but is not limited to, steps S110 to S160.

[0050] Step S110: Obtain the real-time resonance parameters from the resonance detection circuit;

[0051] Step S120: Obtain the real-time voltage value from the voltage detection circuit;

[0052] Step S130: Obtain the real-time current value from the current detection circuit;

[0053] Step S140: Obtain the target level signal switching range based on the real-time voltage and current values;

[0054] Step S150: Determine the current resonance state of the resonant circuit based on the real-time resonance parameters and the target level signal flip-off interval;

[0055] Step S160: Control the operating parameters of the electromagnetic resonant circuit according to the resonance state.

[0056] Understandably, since the resonance parameters of the electromagnetic resonant circuit change according to the application scenario during the heating process, obtaining the real-time resonance parameters from the resonance detection circuit 300 can accurately identify the changes in the resonance parameters of the electromagnetic resonant circuit during the heating process. The voltage detection circuit 100 samples the grid voltage and obtains the real-time voltage value, and the current detection circuit 200 samples the operating current of the electromagnetic resonant circuit and obtains the real-time current value. Based on the real-time current value and the real-time voltage value, the target level signal switching interval is obtained. Based on the real-time resonance parameters and the target level signal switching interval, the current resonance state of the resonant circuit 400 is determined. The operating parameters of the electromagnetic resonant circuit can be controlled according to the resonance state. When the resonance state is not ideal, the operating parameters of the electromagnetic resonant circuit can be adjusted in real time. This can solve the problem of the delayed action of conventional protection of electromagnetic resonant circuits in related technologies, effectively improve the reliability of the equipment, extend the equipment life, and enhance the user experience.

[0057] In the control method of the electromagnetic resonant circuit described above, the electromagnetic resonant circuit further includes a power switching device and a comparator to obtain real-time resonance parameters from the resonance detection circuit, including:

[0058] The voltage value of the resonant circuit is controlled by a power switching device, so that the comparator outputs a trigger level signal according to the voltage value.

[0059] The number of times the trigger level signal flips within a set time is counted to obtain the real-time level signal flip count.

[0060] Reference Figure 2 It is understandable that the electromagnetic resonant circuit is equipped with a power switching device IGBT and a comparator 700. The voltage value of the resonant circuit 400 is controlled by the power switching device IGBT, so that the comparator 700 outputs a trigger level signal according to the voltage value. The number of times the trigger level signal flips within a set time is counted to obtain the number of real-time level signal flips. The number of real-time level signal flips is a specific manifestation of the real-time resonant parameters.

[0061] It should be noted that the time here can be set as an integer multiple of the power grid cycle to reduce the counting error caused by the influence of the power grid voltage on the resonant time. For example, if the power grid cycle is 10ms, the unit time can be set to 50ms or 100ms. The number of times the trigger level signal flips within the set time is counted to obtain the real-time level signal flip count. This facilitates subsequent comparison of the real-time level signal flip count with the target level signal flip interval to determine the current resonant state of the resonant circuit 400.

[0062] Reference Figure 2 It should be noted that the electromagnetic resonant circuit may include a voltage detection circuit 100, a current detection circuit 200, a resonant detection circuit 300, a resonant loop circuit 400, a power switching device IGBT, an MCU module 500, a drive circuit 600, and a rectifier bridge BD1. Furthermore, the MCU module 500 includes multiple comparators: comparator 700, comparator 710, comparator 720, and comparator 730. Comparator 700 and comparator 710 output trigger level signals based on voltage values, comparator 720 amplifies the signal from the sampling resistor RJ1 of the current detection circuit 200, and comparator 730 compares the signal with the voltage value of the voltage detection circuit 100 to determine whether a voltage surge has occurred.

[0063] It should be noted that the voltage detection circuit 100 includes a first diode D1, a second diode D2, a first resistor R1, a third resistor R3, a seventh resistor R7, an eighth resistor R8, a tenth resistor R10, an eleventh resistor R11, a third capacitor C3, a seventh capacitor C7, and an eighth capacitor C8. Among these, the first diode D1 and the second diode D2 are rectifier diodes; the first resistor R1, the third resistor R3, the seventh resistor R7, the eighth resistor R8, the tenth resistor R10, and the eleventh resistor R11 are voltage divider resistors; the third capacitor C3 is an accelerating capacitor; and the seventh capacitor C7 and the eighth capacitor C8 are filter capacitors. One end of the voltage detection circuit 100 is connected to the power supply module, and the other end is connected to the MCU module 500. After the electromagnetic resonant circuit is connected to the mains voltage, the voltage detection circuit 100 can perform voltage division through the tenth resistor R10 and the eleventh resistor R11, and after smoothing by the eighth capacitor C8, it is connected to the AD interface of the MCU module 500. After AD conversion, the real-time voltage value of the electromagnetic resonant circuit can be obtained.

[0064] In addition, the voltage detection circuit 100 can also perform voltage surge detection. The voltage surge detection is achieved by dividing the voltage through the seventh resistor R7 and the eighth resistor R8, filtering it through the seventh capacitor C7, and then connecting it to the negative terminal of the comparator 730 of the MCU module 500. It can be compared with the voltage protection value set at the positive terminal of the comparator 730 of the MCU module 500. When the real-time voltage value is greater than the set voltage protection value, it is determined that a voltage surge has occurred. At this time, the voltage surge can be quickly transmitted to the voltage divider detection point of the MCU module 500 through the third capacitor C3, so that the MCU module 500 generates a corresponding signal and adjusts the operating parameters of the electromagnetic resonant circuit.

[0065] It should be noted that the current detection circuit 200 includes a sampling resistor RJ1, a second resistor R2, a sixth resistor R6, a twelfth resistor R12, a third diode D3, a fourth capacitor C4, a fifth capacitor C5, and a ninth capacitor C9. Among these, the second resistor R2 and the sixth resistor R6 are amplification resistors, while the fourth capacitor C4, the fifth capacitor C5, and the ninth capacitor C9 are filter capacitors. One end of the current detection circuit 200 is connected to the power supply module, and the other end is connected to the MCU module 500. When the electromagnetic resonant circuit is operating, the current detection circuit 200 can obtain the real-time current value of the electromagnetic resonant circuit. Furthermore, since the resistance of the sampling resistor RJ1 is relatively small, the signal needs to be amplified by the comparator 720 of the MCU module 500 before being connected to the AD connector of the MCU module 500 for detection. The MCU module 500 can obtain the real-time current value of the electromagnetic resonant circuit by detecting the amplified signal.

[0066] It should be noted that one end of the resonant detection circuit 300 is connected to the electromagnetic resonant circuit 400, and the other end is connected to comparator 700 and comparator 710 of the MCU module 500, respectively; while one end of the power switching device IGBT is connected to the resonant circuit 400, and the other end is connected to the MCU module 500 through the drive circuit 600. The resonant detection circuit 300 is equipped with a fourth resistor R4, a fifth resistor R5, a ninth resistor R9, a thirteenth resistor R13, and a sixth capacitor C6; among them, the fourth resistor R4, the fifth resistor R5, the ninth resistor R9, and the thirteenth resistor R13 are all voltage divider resistors, and the sixth capacitor C6 is a filter capacitor.

[0067] It should be noted that the resonant circuit 400 includes a coil disk 401 and a resonant capacitor C1. In this embodiment, the voltage value of the resonant circuit 400 can be controlled by the power switching device IGBT. Since the voltages across the resonant circuit 400 are connected to the comparator 700 of the MCU module 500 via the resonant detection circuit 300, the comparator 700 of the MCU module 500 can output a trigger level signal based on the voltage change of the resonant circuit 400. It counts the number of times the trigger level signal flips within a set time, thereby obtaining the real-time level signal flip count. This facilitates subsequent comparison with the target level signal flip interval to determine the current resonant state of the resonant circuit 400.

[0068] It should be noted that the rectifier bridge BD1 is connected to the power module, the resonant circuit circuit 400 and the current detection circuit 200 respectively. The rectifier bridge BD1 can convert AC power into DC power to supply power to electrical equipment.

[0069] It should be noted that the drive circuit 600 is used to drive the power switching device IGBT to turn on or off. The power switching device IGBT is connected to the MCU module 500 through the drive circuit 600. The MCU module 500 can read the high-to-low level toggling signal output by the comparator 700 and generate an interrupt counter output PPG signal to the drive circuit 600. The drive circuit 600 can drive the power switching device IGBT to turn on or off, thereby controlling the voltage value of the resonant circuit 400 through the power switching device IGBT, so that the comparator 700 can output a corresponding trigger level signal according to the voltage value.

[0070] In the control method of the electromagnetic resonant circuit described above, the voltage value of the resonant circuit includes the DC terminal voltage value and the reverse voltage terminal voltage value, and the trigger level signal includes a low level signal and a high level signal.

[0071] When the DC terminal voltage is greater than the reverse terminal voltage, the comparator outputs a low-level signal.

[0072] Alternatively, when the DC terminal voltage is less than the reverse terminal voltage, the comparator outputs a high-level signal.

[0073] It is understood that the voltage value of the resonant circuit 400 includes the DC terminal voltage value and the reverse voltage value, while the trigger level signal of the comparator 700 includes a low level signal and a high level signal. The DC terminal voltage of the resonant circuit 400 is divided by the fourth resistor R4 and the ninth resistor R9 of the resonant detection circuit 300 and then connected to the negative terminal of the comparator 700 of the MCU module 500, while the reverse voltage is divided by the fifth resistor R5 and the thirteenth resistor R13 of the resonant detection circuit 300 and then connected to the positive terminal of the comparator 700 of the MCU module 500. When the IGBT power switching device is turned on, the reverse voltage of the resonant circuit 400 is pulled low. At this time, the DC voltage of the resonant circuit 400 is greater than the reverse voltage, and the comparator 700 outputs a low-level signal. When the IGBT power switching device is turned off, the coil 401 of the resonant circuit 400 charges the resonant capacitor C1, causing the reverse voltage to gradually increase. When the reverse voltage is greater than the DC voltage, the comparator 700 outputs a high-level signal. As the resonance continues, when the current in the coil 401 has finished charging the resonant capacitor C1, the reverse voltage of the resonant circuit 400 reaches its maximum value. Then, the resonant capacitor C1 discharges into the coil 401, causing the reverse voltage to decrease. When the reverse voltage drops to a certain condition, i.e., the reverse voltage is less than the DC voltage, the comparator 700 will output a low level again. At this time, the MCU module 500 can read the high-to-low level switching signal output by the comparator 700, thereby generating an interrupt count and preparing to output the next PPG signal to turn on the power switching device IGBT and start the next resonant cycle.

[0074] Reference Figure 3 , Figure 3 This is a circuit diagram of the equivalent circuit of the resonant circuit 400. It should be noted that the coil 401, as part of the electromagnetic resonant circuit, directly determines the resonant parameters and resonant state of the electromagnetic resonant circuit. During the heating process of the electromagnetic resonant circuit, the coil 401 will couple with the pot, and its equivalent circuit can be shown as follows: Figure 3As shown, the coil disk 401 is equivalent to a coupling inductance L* and a coupling resistance R*. Since the equivalent parameters of the coupling inductance L* and coupling resistance R* vary with factors such as the material, size, and distance of the cookware, as well as with the operating frequency, the resonant parameters exhibit significant uncertainty and complexity in practical applications. Different coupling inductances L* and coupling resistances R* directly affect the overall power, resonant time, operating frequency, charging current, reverse voltage, IGBT reverse current, and IGBT turn-on current, among other resonant parameters. These resonant parameters directly determine the reliable operation of the IGBT power switching device and thus the reliability of the equipment. Obtaining the real-time resonant parameters of the resonant circuit 400 through the coil disk 401 facilitates subsequent adjustments to the operating parameters of the electromagnetic resonant circuit, ensuring the reliability of the IGBT operation, thereby effectively improving equipment reliability, extending equipment lifespan, and enhancing the user experience.

[0075] In the above-mentioned control method for electromagnetic resonant circuits, the target level signal switching interval is obtained based on the real-time voltage and real-time current values, including:

[0076] Real-time power is calculated based on real-time voltage and real-time current values;

[0077] The target level signal switching range is calculated based on the real-time power, the first preset value, and the second preset value.

[0078] It is understandable that after obtaining the real-time voltage value from the voltage detection circuit 100 and the real-time current value from the current detection circuit 200, the real-time power can be calculated based on the real-time voltage and real-time current values. Specifically, the formula for calculating the real-time power is Pow_A = Ad_V * Ad_I, where Pow_A is the real-time power, Ad_V is the real-time voltage value, and Ad_I is the real-time current value.

[0079] Understandably, the target level signal reversal interval needs to be calculated based on real-time power, a first preset value, and a second preset value. The first and second preset values ​​are relationship coefficients obtained from experimental test data of different resonance parameters during the design phase of equipment such as cookware, defining the safe resonance range. Specifically, the formula for calculating the target level signal reversal interval is Cnt_A = a * Pow_A + b, where Cnt_A is the target level signal reversal interval, Pow_A is the real-time power, a is the first preset value, and b is the second preset value. Here, a and b can be two different sets of preset values, and two sets of Cnt_A values, i.e., the target level signal reversal interval, are derived from a and b.

[0080] In the above-mentioned control method for electromagnetic resonant circuits, the resonant state includes ideal resonant state and abnormal resonant state. The current resonant state of the resonant circuit is determined based on real-time resonant parameters and the target level signal switching interval, including:

[0081] When the number of real-time level signal flips is within the target level signal flip range, the resonant circuit is determined to be in an ideal resonant state.

[0082] When the number of real-time level signal flips is outside the target level signal flip range, the resonant circuit is determined to be in an abnormal resonance state.

[0083] It is understandable that the resonant state can include an ideal resonant state and an abnormal resonant state. The current resonant state of the resonant circuit 400 can be determined based on the real-time resonant parameters and the target level signal switching interval. Specifically, the number of real-time level signal switching cycles is compared with the target level signal switching interval. If the number of real-time level signal switching cycles falls within the target level signal switching interval, the resonant circuit 400 is determined to be in an ideal resonant state. If the number of real-time level signal switching cycles does not fall within the target level signal switching interval, the resonant circuit 400 is determined to be in an abnormal resonant state.

[0084] In the above-mentioned control method for electromagnetic resonant circuits, abnormal resonance states include overdamped resonance states and underdamped resonance states. The control method for electromagnetic resonant circuits also includes:

[0085] When the number of real-time level signal flips exceeds the upper limit of the target level signal flip range, the resonant circuit is determined to be in an overdamped resonance state.

[0086] When the number of real-time level signal flips is less than the lower limit of the target level signal flip interval, the resonant circuit is determined to be in an underdamped resonant state.

[0087] It is understandable that abnormal resonance states include overdamped resonance (corresponding to smaller L* and larger R* in the resonant equivalent parameters, higher operating frequency, larger IGBT on-state voltage and current at low power, and larger IGBT losses) and underdamped resonance (corresponding to smaller R* in the resonant equivalent parameters, higher IGBT reverse voltage, larger reverse current, and greater electrical stress). By comparing the number of real-time level signal flips with the target level signal flip range, if the number of real-time level signal flips exceeds the upper limit of the target level signal flip range, the resonant circuit 400 is determined to be in an overdamped resonance state; if the number of real-time level signal flips is less than the lower limit of the target level signal flip range, the resonant circuit 400 is determined to be in an underdamped resonance state.

[0088] It should be noted that when the resonance state is in an overdamped resonance state, the operating parameters of the electromagnetic resonant circuit can be adjusted by reducing the PGG turn-on time and limiting the heating power; when the resonance state is in an underdamped resonance state, the operating parameters of the electromagnetic resonant circuit can be adjusted by increasing the PGG turn-on time and increasing the heating power. The adjustment method can be selected according to the actual situation, and no specific limitations are made here.

[0089] In the above-mentioned control method for electromagnetic resonant circuits, the operating parameters of the electromagnetic resonant circuit are controlled according to the resonance state, including:

[0090] When the resonant circuit is in an ideal resonant state, the electromagnetic resonant circuit is controlled to maintain its current operating state.

[0091] When the resonant circuit is in an abnormal resonance state, adjust the heating power during the electromagnetic resonant circuit heating process, or adjust the PPG turn-on time, or adjust the voltage protection value of the power switching device.

[0092] Understandably, after determining the current resonance state of the resonant circuit 400, the operating parameters of the electromagnetic resonant circuit can be controlled according to the resonance state. Heating adjustments can be made to the equipment based on the real-time resonance state, adding or actively removing restrictions to ensure the equipment operates at its ideal condition while maintaining a good user experience. Specifically, when the resonant circuit 400 is in an ideal resonance state, the equipment is in an ideal working environment. In this case, the electromagnetic resonant circuit can be kept in its current operating state without adjusting its operating parameters. However, when the resonant circuit 400 is in an abnormal resonance state, the operating parameters of the electromagnetic resonant circuit during heating need to be adjusted. Specifically, this can include adjusting the heating power, the PPG turn-on time, and the voltage protection value of the power switching devices.

[0093] Understandably, adjusting and limiting the heating power during the electromagnetic resonant circuit heating process can reduce the operating losses of the IGBT power switching device. For example, the maximum power can be limited from 2000W to 1700W, and the minimum power from 1000W to 1200W. Lowering the voltage protection value of the IGBT power switching device can increase the reverse voltage safety margin; for example, the voltage protection value can be adjusted from 1150V to 1050V. Furthermore, the turn-on delay time of the PPG can be adjusted to ensure that the IGBT power switching device turns on at the lowest voltage, thereby reducing losses. In addition, the switching resonant capacitor C1 or the coil disk 401 can be adjusted to change the resonant parameters of the electromagnetic resonant circuit, so that the electromagnetic resonant circuit can operate in an ideal resonant state.

[0094] Reference Figure 4 The second aspect of the present invention provides an operation control device 200, including at least one control processor 210 and a memory 220 for communicatively connecting to the at least one control processor 210; the memory 220 stores instructions that can be executed by the at least one control processor 210, the instructions being executed by the at least one control processor 210 to enable the at least one control processor 210 to execute the control method of the electromagnetic resonant circuit of the first aspect embodiment described above.

[0095] According to the operation control device provided in the embodiments of the present invention, by setting up a voltage detection circuit 100, a current detection circuit 200, a resonance detection circuit 300, and a resonant circuit 400, the device acquires real-time resonance parameters from the resonance detection circuit 300, real-time voltage values ​​from the voltage detection circuit 100, and real-time current values ​​from the current detection circuit 200. Based on the real-time voltage and current values, the device obtains the target level signal switching interval. Based on the real-time resonance parameters and the target level signal switching interval, the device determines the current resonance state of the resonant circuit 400. Based on the resonance state, the device controls the operating parameters of the electromagnetic resonant circuit. This allows the device to accurately identify changes in resonance parameters using the electromagnetic resonant circuit and adjust the operating parameters in real time according to the resonance state, effectively improving the reliability of the equipment, extending the equipment life, and enhancing the user experience.

[0096] A third aspect of the present invention provides an induction cooker, including an operation control device as described in the second aspect of the present invention.

[0097] The induction cooker provided by the present invention, by setting a voltage detection circuit 100, a current detection circuit 200, a resonance detection circuit 300, and a resonance circuit 400, acquires real-time resonance parameters from the resonance detection circuit 300, real-time voltage values ​​from the voltage detection circuit 100, and real-time current values ​​from the current detection circuit 200. Based on the real-time voltage and current values, a target level signal switching interval is obtained. Based on the real-time resonance parameters and the target level signal switching interval, the current resonance state of the resonance circuit 400 is determined. The operating parameters of the electromagnetic resonance circuit are controlled according to the resonance state. This allows for accurate identification of changes in resonance parameters using the electromagnetic resonance circuit, and real-time adjustment of operating parameters based on the resonance state. This effectively improves equipment reliability, extends equipment lifespan, and enhances user experience.

[0098] A fourth aspect of the present invention provides a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the control method of the electromagnetic resonant circuit as described in the first aspect above.

[0099] According to the computer-readable storage medium provided in the embodiments of the present invention, by setting a voltage detection circuit 100, a current detection circuit 200, a resonance detection circuit 300, and a resonant circuit 400, real-time resonance parameters from the resonance detection circuit 300, real-time voltage values ​​from the voltage detection circuit 100, and real-time current values ​​from the current detection circuit 200 are obtained. The target level signal switching interval is obtained based on the real-time voltage and current values. The current resonance state of the resonant circuit 400 is determined based on the real-time resonance parameters and the target level signal switching interval. The operating parameters of the electromagnetic resonant circuit are controlled according to the resonance state. This allows for accurate identification of changes in resonance parameters using the electromagnetic resonant circuit, and real-time adjustment of operating parameters based on the resonance state. This effectively improves equipment reliability, extends equipment life, and enhances user experience.

[0100] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which may include computer storage media or non-transitory media and communication media or transient media. As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc DVD or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0101] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A control method for an electromagnetic resonant circuit, characterized in that, The electromagnetic resonant circuit includes a voltage detection circuit, a current detection circuit, a resonance detection circuit, and a resonant loop circuit. The voltage detection circuit detects the mains voltage, the current detection circuit detects the operating current of the electromagnetic resonant circuit, and the resonance detection circuit detects the real-time resonance parameters of the resonant loop circuit. The control method for the electromagnetic resonant circuit includes: The real-time resonance parameters from the resonance detection circuit are obtained, and the real-time resonance parameters include the number of real-time level signal flips. Obtain the real-time voltage value from the voltage detection circuit; Obtain the real-time current value from the current detection circuit; The real-time power is calculated based on the real-time voltage value and the real-time current value; The target level signal switching interval is calculated based on the real-time power, the first preset value, and the second preset value. When the number of real-time level signal flips is within the target level signal flip range, it is determined that the resonant circuit is in an ideal resonant state. When the number of real-time level signal flips is outside the target level signal flip range, the resonant circuit is determined to be in an abnormal resonance state. The operating parameters of the electromagnetic resonant circuit are controlled according to the resonant state.

2. The control method for the electromagnetic resonant circuit according to claim 1, characterized in that, The electromagnetic resonant circuit further includes a power switching device and a comparator. The acquisition of real-time resonant parameters from the resonant detection circuit includes: The voltage value of the resonant circuit is controlled by the power switching device, so that the comparator outputs a trigger level signal according to the voltage value; The number of times the trigger level signal flips within a set time is counted to obtain the real-time level signal flip count.

3. The control method for the electromagnetic resonant circuit according to claim 2, characterized in that, The voltage values ​​of the resonant circuit include the DC terminal voltage value and the reverse voltage terminal voltage value, and the trigger level signal includes a low level signal and a high level signal; When the DC terminal voltage value is greater than the reverse voltage value, the comparator outputs the low-level signal; Alternatively, when the DC terminal voltage value is less than the reverse voltage value, the comparator outputs the high-level signal.

4. The control method for the electromagnetic resonant circuit according to claim 1, characterized in that, The abnormal resonance state includes overdamped resonance state and underdamped resonance state, and the control method of the electromagnetic resonance circuit further includes: When the number of real-time level signal flips is greater than the upper limit of the target level signal flip interval, the resonant circuit is determined to be in an overdamped resonance state. When the number of real-time level signal flips is less than the lower limit of the target level signal flip interval, the resonant circuit is determined to be in an underdamped resonant state.

5. The control method for the electromagnetic resonant circuit according to claim 1, characterized in that, The step of controlling the operating parameters of the electromagnetic resonant circuit according to the resonance state includes: When the resonant circuit is in an ideal resonant state, the electromagnetic resonant circuit is controlled to maintain its current operating state. When the resonant circuit is in an abnormal resonance state, adjust the heating power during the heating process of the electromagnetic resonant circuit, or adjust the PPG turn-on time, or adjust the voltage protection value of the power switching device.

6. An operation control device, characterized in that, It includes at least one control processor and a memory for communicatively connecting to the at least one control processor; the memory stores instructions executable by the at least one control processor, which, when executed by the at least one control processor, enable the at least one control processor to perform the control method for the electromagnetic resonant circuit as described in any one of claims 1 to 5.

7. An induction cooker, characterized in that, Includes the operation control device as described in claim 6.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions for causing a computer to perform the control method for the electromagnetic resonant circuit as described in any one of claims 1 to 5.

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