Temperature measuring device, cooking equipment, temperature measuring method and device of cooking equipment and storage medium

Abstract

The invention provides a temperature measuring device, cooking equipment, a temperature measuring method and device of the cooking equipment and a storage medium, the cooking equipment comprises at least one electromagnetic heating coil, the at least one electromagnetic heating coil is used for being coupled with a pot body and heating the pot body, and the temperature measuring device comprises an obtaining circuit used for obtaining operation parameters of the target electromagnetic heating coil; the control device is connected with the acquisition circuit and is used for determining the magnetic conductivity and the electric conductivity of the pot body according to the operation parameters; obtaining a fitting relationship among the magnetic conductivity, the conductivity and the temperature value of the pot body; determining target temperature values corresponding to the magnetic conductivity and the conductivity according to the fitting relationship; and outputting the target temperature value.

Description

Technical Field

[0001] The present invention relates to the field of circuit technology, and in particular to a temperature measuring device, cooking equipment, and a temperature measuring method, device and storage medium thereof. Background Art

[0002] In the related technical solutions, the temperature measurement solution in the induction cooker is to set a negative temperature coefficient thermistor (NTC thermistor) on the coil disk, and use the NTC thermistor to indirectly measure the temperature of the cookware through the ceramic panel, which has problems such as inaccurate temperature measurement and temperature measurement lag.

[0003] Due to the existence of the above problems, there are errors in the measurement results, making the intelligent cooking of the cooking equipment, such as precise temperature control cooking, low temperature cooking, and water boiling difficult to perceive, affecting the control of cooking. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, a first aspect of the present invention is to provide a temperature measuring device.

[0006] A second aspect of the present invention is to provide a temperature measurement method for a cooking device.

[0007] A third aspect of the present invention is to provide a temperature measuring device for cooking equipment.

[0008] A fourth aspect of the present invention is to provide another temperature measuring device for cooking equipment.

[0009] A fifth aspect of the present invention provides a readable storage medium.

[0010] A sixth aspect of the present invention provides a cooking device.

[0011] In view of this, according to a first aspect of the present invention, the present invention provides a temperature measuring device for a cooking device, the cooking device comprising: at least one electromagnetic heating coil, the at least one electromagnetic heating coil being used to couple with a pot body to heat the pot body, the temperature measuring device comprising: an acquisition circuit for acquiring operating parameters of the target electromagnetic heating coil; a control device connected to the acquisition circuit, for determining the magnetic permeability and electrical conductivity of the pot body according to the operating parameters; acquiring a fitting relationship between the magnetic permeability, electrical conductivity and temperature value of the pot body; determining a target temperature value corresponding to the magnetic permeability and electrical conductivity according to the fitting relationship; and outputting the target temperature value.

[0012] The technical solution of the present application proposes a temperature measuring device, in which, during the process of the electromagnetic heating coil heating the pot body, the electrical parameters of the pot body are reflected to the electromagnetic heating coil through mutual inductance, and the operating parameters of the target electromagnetic heating coil are obtained so as to obtain the electrical parameters of the cookware, and the electrical parameters of the pot body are obtained by analyzing them.

[0013] Among them, the above electrical parameters are also the operating parameters in this application.

[0014] Since the electrical parameters of the pot body are related to the temperature of the pot body, after determining the electrical parameters of the pot body, a fitting relationship obtained by fitting the magnetic permeability, electrical conductivity and the temperature value of the pot body is obtained, so that the above fitting relationship can be used as a reference table for looking up the temperature value of the pot body, thereby determining the temperature value of the pot body.

[0015] In the above technical solution, the temperature of the pot body can be measured by using a temperature measuring device. Compared with the related technical solution, there is no need to use an NTC thermistor to measure the temperature. Therefore, the error existing when the NTC thermistor is used to measure the temperature of the pot body is reduced, that is, the accuracy of temperature measurement is improved, so as to realize precise temperature control cooking, low temperature cooking, and water boiling detection.

[0016] In the above technical solutions, in the related technical solutions, the NTC thermistor used to measure the temperature is an indirect temperature sampling, so the result of the temperature measurement has a hysteresis, while in the technical solution of the present application, as the target electromagnetic heating coil heats the pot body, the operating parameters of the pot body can be measured, thereby realizing the measurement of the temperature value of the pot body. Therefore, the temperature value measured based on the technical solution of the present application has the characteristic of low hysteresis, that is, the temperature value of the pot body measured by the present application can reflect the real-time temperature of the pot body to a large extent in real time, so as to perform precise temperature control cooking, low temperature cooking, and water boiling detection based on the measured temperature value.

[0017] In some technical solutions, optionally, the electromagnetic heating coil can be understood as a wire coil, which can form a changing magnetic field when a changing power supply is passed through it, so that the pot body located in the above magnetic field forms eddy currents to achieve heating of the pot body.

[0018] In some technical solutions, optionally, the above fitting relationship can be obtained by performing experimental tests on different pots after the temperature measuring device is assembled in the cooking device, and can be written into the control device before the cooking device leaves the factory so that the control device can read it.

[0019] In addition, the temperature measuring device proposed in this application also has the following additional technical features.

[0020] In some technical schemes, optionally, the operating parameters include: a voltage signal acting on the target electromagnetic heating coil, a voltage waveform signal and a current waveform signal on the target electromagnetic heating coil, and a control device is specifically used to: determine the first harmonic sine and cosine component corresponding to the voltage waveform signal as the first component; determine the first harmonic sine and cosine component corresponding to the current waveform signal as the second component; determine the difference between the voltage signal and the first component; wherein the ratio of the second component to the difference is used to represent the magnetic permeability and electrical conductivity.

[0021] In this technical solution, the calculation amount is reduced by selecting the first harmonic sine and cosine components for calculation.

[0022] In some technical schemes, optionally, the acquisition circuit includes a first acquisition circuit, and the first acquisition circuit includes: a first subtraction circuit, the inverting input terminal and the non-phase input terminal of the first subtraction circuit are respectively connected to the two ends of the target electromagnetic heating coil; a first feedback resistor, located between the inverting input terminal of the first subtraction circuit and the output terminal of the first subtraction circuit, and the output terminal of the first subtraction circuit is used to output a voltage signal.

[0023] In this technical solution, since the inverting input terminal and the non-inverting input terminal of the first subtraction circuit are respectively connected to the two ends of the target electromagnetic heating coil, a complete AC waveform, that is, a voltage signal, can be obtained under the operation of the first subtraction circuit.

[0024] By setting the first feedback resistor, the waveform amplitude of the complete AC waveform can be adjusted to obtain an AC waveform that meets the needs of the user.

[0025] In some technical solutions, optionally, the value of the first feedback resistor can be determined according to actual use requirements, which will not be described in detail here.

[0026] In some technical solutions, optionally, the first acquisition circuit also includes: a first diode, the anode of the first diode is connected to the inverting input terminal of the first subtraction circuit, and the cathode of the first diode is connected to the first power supply; and / or a second diode, the anode of the second diode is connected to the non-inverting input terminal of the first subtraction circuit, and the cathode of the second diode is connected to the first power supply.

[0027] In this technical solution, a first diode is provided so that when the voltage connected to the reverse input terminal of the first subtraction circuit is too high, the first diode is used to clamp the input voltage to the voltage of the first power supply, thereby reducing the probability of the first subtraction circuit being damaged due to the excessively high voltage connected, thereby improving the reliability of the temperature measuring device.

[0028] In some technical solutions, optionally, the voltage output by the first power supply can be determined according to actual design requirements, which will not be elaborated here.

[0029] In some technical solutions, optionally, a second diode is provided so that when the voltage connected to the forward input terminal of the first subtraction circuit is too high, the first diode is used to clamp the input voltage to the voltage of the ground point, thereby reducing the probability of the first subtraction circuit being damaged due to the excessively high voltage connected, thereby improving the reliability of the temperature measuring device.

[0030] In some technical solutions, optionally, the first acquisition circuit is provided with a first diode, a second diode, or the first diode and the second diode are provided at the same time.

[0031] In some technical schemes, optionally, the first acquisition circuit also includes: a first resistor, a first end of the first resistor is connected to the inverting input terminal of the first subtraction circuit, and a second end of the first resistor is grounded; and / or a second resistor, a first end of the second resistor is connected to the non-inverting input terminal of the first subtraction circuit, and a second end of the second resistor is grounded.

[0032] In this technical solution, a first resistor is set so that the first resistor is connected to form a loop between one end of the target electromagnetic heating coil and the grounding point, so that the voltage on the first resistor is used as the input of the inverting input terminal in the first subtraction circuit, thereby reducing the voltage value input to the first subtraction circuit, thereby reducing the probability of the first subtraction circuit being damaged due to excessively high voltage, thereby improving the reliability of the temperature measuring device.

[0033] Similarly, by setting a second resistor so that the second resistor is connected to one end of the target electromagnetic heating coil and the grounding point to form a loop, the voltage on the second resistor is used as the input of the positive input terminal in the first subtraction circuit, thereby reducing the voltage value input to the first subtraction circuit, thereby reducing the probability of damage to the first subtraction circuit due to excessively high voltage, thereby improving the reliability of the temperature measuring device.

[0034] In some technical solutions, optionally, the first acquisition circuit is provided with a first resistor, a second resistor, or the first resistor and the second resistor are provided at the same time.

[0035] In some technical solutions, optionally, the first acquisition circuit also includes: a first bias amplifier circuit, a negative phase input terminal of the first bias amplifier circuit is connected to the output terminal of the first subtraction circuit, a positive phase input terminal of the first bias amplifier circuit is connected to the first power supply, and the output terminal of the first bias amplifier circuit is used to output a biased voltage signal; a second feedback resistor is located between the inverting input terminal of the first bias amplifier circuit and the output terminal of the first bias amplifier circuit.

[0036] In this technical solution, a first bias circuit is provided so as to utilize the first bias circuit to amplify the weak waveform of the mains zero-crossing window, thereby selectively acquiring a voltage signal. In this process, voltage interference accompanying the voltage signal can be reduced.

[0037] In the above technical solution, by setting the second feedback resistor, the first bias circuit can be adjusted according to actual use needs, thereby making personalized adjustments to ensure the reliability of the results output by the temperature measuring device.

[0038] In some technical solutions, optionally, the first acquisition circuit further includes: a first current limiting resistor, located between the output end of the first subtraction circuit and the negative phase input end of the first bias amplifier circuit.

[0039] In this technical solution, a first current limiting resistor is provided so as to utilize the first current limiting resistor to limit the current connected to the first bias amplifier circuit, thereby reducing the probability of excessive current connected to the first bias amplifier circuit causing the first bias amplifier circuit to be damaged due to overcurrent, thereby ensuring the reliability of the output result of the temperature measuring device.

[0040] In some technical solutions, the value of the first current limiting resistor can be determined according to actual usage requirements, which will not be elaborated here.

[0041] In some technical schemes, optionally, the first acquisition circuit also includes: a first voltage-dividing resistor, located between the first power supply and the non-inverting input terminal of the first bias amplifier circuit; a second voltage-dividing resistor, the first end of the second voltage-dividing resistor is connected to the non-inverting input terminal of the first bias amplifier circuit, and the second end of the second voltage-dividing resistor is grounded.

[0042] In this technical solution, the first voltage-dividing resistor and the second voltage-dividing resistor are connected in series and then connected between the first power supply and the ground, so that a loop is formed between the first power supply and the ground. Since the non-inverting input terminal of the first bias amplifier circuit is connected to the first end of the second voltage-dividing resistor, the first power supply is no longer connected to the first bias amplifier circuit, but a voltage value selected according to actual design requirements.

[0043] In the above technical solution, the resistance values ​​of the first voltage-dividing resistor and the second voltage-dividing resistor can be selected according to actual design requirements so as to input a signal to the first bias amplifier circuit. In this process, the requirements of the temperature measurement circuit for the output voltage of the first power supply can be reduced, thereby facilitating the reduction of the cost of the temperature measurement device.

[0044] In some technical solutions, optionally, the first acquisition circuit further includes: a first capacitor, and the first capacitor is connected in parallel with the second feedback resistor.

[0045] In this technical solution, by setting the first capacitor, it can be used as a low-pass filter to suppress the interference of high-frequency signals, so that the first capacitor can be used to realize the high-frequency response control of the first bias amplifier circuit, thereby improving the working stability of the first bias amplifier circuit.

[0046] In addition, the value of the first capacitor can be determined according to actual design requirements, so as to improve the response speed of the first bias amplifier circuit.

[0047] In some technical solutions, optionally, it also includes: a first selection circuit, connected to at least one electromagnetic heating coil and the first acquisition circuit, for selecting a target electromagnetic heating coil.

[0048] In this technical solution, a first selection circuit is set up so that the first selection circuit can be used to connect at least one electromagnetic heating coil and a first acquisition circuit. In this process, at least one electromagnetic heating coil can share the same first acquisition circuit to collect and process voltage signals, so as to reduce the complexity of the temperature measuring device.

[0049] In some technical solutions, optionally, the first selection circuit can be a set of single-pole multi-throw switches, specifically, the set of single-pole multi-throw switches includes a first single-pole multi-throw switch and a second single-pole multi-throw switch. The static contacts of the first single-pole multi-throw switch and the second single-pole multi-throw switch are respectively connected to the two ends of the corresponding electromagnetic heating coil, and the moving contacts of the first single-pole multi-throw switch and the second single-pole multi-throw switch are connected to the first acquisition circuit.

[0050] In some technical schemes, optionally, the acquisition circuit includes a second acquisition circuit, and the second acquisition circuit includes: a first current transformer, located in an excitation circuit where at least one electromagnetic heating coil is located; a second subtraction circuit, the positive phase input terminal and the negative phase input terminal of the second subtraction circuit are connected to the first output terminal and the second output terminal of the first current transformer, and the output terminal of the second subtraction circuit is used to output a voltage waveform signal; a third feedback resistor, located between the positive phase input terminal of the second subtraction circuit and the output terminal of the second subtraction circuit.

[0051] In this technical solution, due to the connection between the second subtraction circuit and the first current transformer, the voltage waveform, that is, the voltage waveform signal, can be obtained by using the differential coil of the first current transformer.

[0052] In some technical schemes, optionally, the second acquisition circuit also includes: a third voltage-dividing resistor, a first end of the third voltage-dividing resistor is connected to the positive phase input terminal of the second subtraction circuit, and a second end of the third voltage-dividing resistor is connected to the first power supply; and / or a fourth voltage-dividing resistor, a first end of the fourth voltage-dividing resistor is connected to the negative phase input terminal of the second subtraction circuit, and a second end of the fourth voltage-dividing resistor is grounded.

[0053] In this technical solution, a third voltage-dividing resistor is provided so that the first output end of the first current transformer can form a loop with the first power supply through the third voltage-dividing resistor, thereby adjusting the voltage input to the positive input end of the second subtraction circuit. In this process, a reasonable resistance value can be selected for the third voltage-dividing resistor so as to limit the voltage connected to the positive input end of the second subtraction circuit.

[0054] Similarly, by setting the fourth voltage-dividing resistor, the second output end of the first current transformer can form a loop with the ground through the fourth voltage-dividing resistor, thereby adjusting the voltage input to the inverting input end of the second subtraction circuit. In this process, a reasonable resistance value can be selected for the fourth voltage-dividing resistor to limit the voltage connected to the inverting input end of the second subtraction circuit.

[0055] In some technical solutions, optionally, the second acquisition circuit further includes: a third diode, an anode of the third diode is connected to the non-phase input terminal of the second subtraction circuit, and a cathode of the third diode is connected to the first power supply.

[0056] In this technical solution, a third diode is provided so as to utilize the third diode to clamp the voltage connected to the non-phase input terminal of the second subtraction circuit, thereby reducing the probability of the second subtraction circuit being damaged due to overvoltage caused by excessively large connected voltage.

[0057] Specifically, when the input voltage is greater than the sum of the conduction voltage of the first power supply and the conduction voltage of the third diode, the third diode is turned on. At this time, the input voltage is pulled down to the voltage of the first power supply.

[0058] In some technical solutions, optionally, the acquisition circuit also includes: a third subtraction circuit, the inverting input terminal of the third subtraction circuit is connected to the output terminal of the second subtraction circuit, the non-phase input terminal of the third subtraction circuit is connected to the output terminal of the first subtraction circuit, and the output terminal of the third subtraction circuit is used to output the difference between the voltage signal and the first component; a fourth feedback resistor, located between the non-phase input terminal of the third subtraction circuit and the output terminal of the third subtraction circuit.

[0059] In this technical solution, a third subtraction circuit is provided so as to utilize the third subtraction circuit to realize direct calculation of the difference. In this process, there is no need to perform calculation in the control device, thereby improving the response speed in the temperature measurement control process.

[0060] In some technical solutions, optionally, the third subtraction circuit further includes: a second current limiting resistor, located between the inverting input terminal of the third subtraction circuit and the output terminal of the second subtraction circuit.

[0061] In this technical solution, a second current limiting resistor is provided so as to utilize the second current limiting resistor to limit the current connected to the third subtraction circuit, thereby reducing the probability of excessive current connected to the third subtraction circuit and causing the third subtraction circuit to be damaged due to overcurrent, thereby ensuring the reliability of the output result of the temperature measuring device.

[0062] In some technical solutions, the value of the second current limiting resistor can be determined according to actual use requirements, which will not be described in detail here.

[0063] In some technical schemes, optionally, the third subtraction circuit also includes: a fifth voltage-dividing resistor, located between the output end of the first subtraction circuit and the non-phase input end of the third subtraction circuit; a sixth voltage-dividing resistor, the first end of the sixth voltage-dividing resistor is connected to the non-phase input end of the third subtraction circuit, and the second end of the sixth voltage-dividing resistor is grounded.

[0064] In this technical solution, the fifth voltage-dividing resistor and the sixth voltage-dividing resistor are connected in series and then connected between the output end of the first subtraction circuit and ground. Therefore, the voltage output by the output end of the first subtraction circuit can be input to the third subtraction circuit using the fifth voltage-dividing resistor and the sixth voltage-dividing resistor.

[0065] In this process, the voltage value input to the positive phase input terminal of the third subtraction circuit can be adjusted, and current limiting control is also achieved, thereby reducing the probability of damage to the third subtraction circuit due to overcurrent and overvoltage caused by excessive current, thereby improving the reliability of the temperature measuring device.

[0066] In some technical solutions, optionally, the fifth voltage-dividing resistor and the sixth voltage-dividing resistor may be set according to actual use requirements, which will not be described in detail here.

[0067] In some technical solutions, optionally, it also includes: a second selection circuit, which is arranged in the excitation circuit where at least one electromagnetic heating coil is located, and is used to select the excitation circuit where the target electromagnetic heating coil is located.

[0068] In this technical solution, a second selection circuit is provided so that the second selection circuit can be used to connect the excitation circuit to be measured by the second acquisition circuit. In this process, multiple excitation circuits can share the same second acquisition circuit to reduce the complexity of the temperature measuring device.

[0069] In some technical solutions, optionally, the second selection circuit can be a group of single-pole multi-throw switches, specifically, the group of single-pole multi-throw switches includes a third single-pole multi-throw switch and a fourth single-pole multi-throw switch. The static contacts of the third single-pole multi-throw switch and the fourth single-pole multi-throw switch are respectively connected to the first end and the second end of the corresponding first current transformer, and the moving contacts of the third single-pole multi-throw switch and the fourth single-pole multi-throw switch are connected to the second acquisition circuit.

[0070] In some technical schemes, optionally, the acquisition circuit includes a third acquisition circuit, and the third acquisition circuit includes: a second current transformer, located in the excitation circuit where at least one electromagnetic heating coil is located; a connecting resistor, located between the first output terminal and the second output terminal of the second current transformer, and one end of the connecting resistor is grounded; a fourth subtraction circuit, the positive phase input terminal of the fourth subtraction circuit is connected to the other end of the connecting resistor, the negative phase input terminal of the fourth subtraction circuit is connected to the output terminal of the fourth subtraction circuit, and the output terminal of the fourth subtraction circuit is used to output a current waveform signal.

[0071] In this technical solution, a second current transformer is provided to obtain the current waveform signal, and a connecting resistor is provided to express the current waveform signal in the form of voltage, which is then outputted by a fourth subtraction circuit.

[0072] In this process, the fourth subtraction circuit can be understood as a follower.

[0073] In some technical solutions, optionally, the third acquisition circuit also includes: a second bias amplifier circuit, the negative phase input terminal of the second bias amplifier circuit is connected to the output terminal of the fourth subtraction circuit, the positive phase input terminal of the second bias amplifier circuit is connected to the first power supply, and the output terminal of the second bias amplifier circuit is used to output the biased current waveform signal; a fifth feedback resistor, located between the inverting input terminal of the second bias amplifier circuit and the output terminal of the second bias amplifier circuit.

[0074] In this technical solution, a second bias amplifier circuit is provided so as to utilize the second bias amplifier circuit to bias-amplify the current waveform signal, thereby obtaining a current waveform signal corresponding to the voltage waveform signal for calculation.

[0075] In some technical solutions, optionally, the third acquisition circuit further includes: a third current limiting resistor, located between the inverting input terminal of the fourth subtraction circuit and the negative input terminal of the second bias amplifier circuit.

[0076] In this technical solution, a third current limiting resistor is provided so as to limit the current flowing into the second bias amplifier circuit, thereby reducing the probability of the second bias amplifier circuit being damaged due to excessive current flowing therein, thereby improving the reliability of the temperature measuring device.

[0077] In some technical solutions, optionally, the value of the third current limiting resistor can be determined according to actual design requirements, which will not be described in detail here.

[0078] In some technical schemes, optionally, the third acquisition circuit also includes: a seventh voltage-dividing resistor, located between the first power supply and the non-phase input terminal of the second bias amplifier circuit; an eighth voltage-dividing resistor, the first end of the eighth voltage-dividing resistor is connected to the non-phase input terminal of the second bias amplifier circuit, and the second end of the eighth voltage-dividing resistor is grounded.

[0079] In this technical solution, a seventh voltage-dividing resistor and an eighth voltage-dividing resistor are provided so that the first power supply can form a loop between the seventh voltage-dividing resistor and the eighth voltage-dividing resistor and the ground, thereby adjusting the voltage input to the second bias amplifier circuit. In this process, reasonable resistance values ​​can be selected for the seventh voltage-dividing resistor and the eighth voltage-dividing resistor so as to reduce the probability of damage to the second bias amplifier circuit due to overvoltage.

[0080] In some technical solutions, optionally, the third acquisition circuit further includes: a second capacitor connected in parallel with the fifth feedback resistor.

[0081] In this technical solution, by setting the second capacitor, it can be used as a low-pass filter to suppress the interference of high-frequency signals, so that the second capacitor can be used to realize the high-frequency response control of the second bias amplifier circuit, thereby improving the working stability of the second bias amplifier circuit.

[0082] In addition, the value of the second capacitor can be determined according to actual design requirements, so as to improve the response speed of the second bias amplifier circuit.

[0083] In some technical solutions, optionally, the third acquisition circuit also includes: a third selection circuit, which is arranged in the excitation circuit where at least one electromagnetic heating coil is located, and is used to select the excitation circuit where the target electromagnetic heating coil is located.

[0084] In this technical solution, a third selection circuit is provided so that the third selection circuit can be used to connect the excitation circuit to be measured by the third acquisition circuit. In this process, multiple excitation circuits can share the same third acquisition circuit to reduce the complexity of the temperature measuring device.

[0085] In some technical solutions, optionally, the third selection circuit can be a group of single-pole multi-throw switches, specifically, the group of single-pole multi-throw switches includes a fifth single-pole multi-throw switch and a sixth single-pole multi-throw switch. The static contacts of the fifth single-pole multi-throw switch and the sixth single-pole multi-throw switch are respectively connected to the first end and the second end of the corresponding second current transformer, and the moving contacts of the fifth single-pole multi-throw switch and the sixth single-pole multi-throw switch are connected to the third acquisition circuit.

[0086] According to a second aspect of the present invention, the present invention provides a temperature measurement method for a cooking device, the cooking device comprising: at least one electromagnetic heating coil, the at least one electromagnetic heating coil being used to couple with a pot body to heat the pot body, the temperature measurement method comprising: obtaining operating parameters of the target electromagnetic heating coil; determining the magnetic permeability and electrical conductivity of the pot body according to the operating parameters; obtaining a fitting relationship between the magnetic permeability, electrical conductivity and temperature value of the pot body; determining a target temperature value corresponding to the magnetic permeability and electrical conductivity according to the fitting relationship; and outputting the target temperature value.

[0087] In this technical solution, during the process of the electromagnetic heating coil heating the pot body, the electrical parameters of the pot body are reflected to the electromagnetic heating coil through mutual inductance. The operating parameters of the target electromagnetic heating coil are obtained to obtain the electrical parameters of the cookware, and the electrical parameters of the pot body are obtained by analyzing them.

[0088] Among them, the above electrical parameters are also the operating parameters in this application.

[0089] Since the electrical parameters of the pot body are related to the temperature of the pot body, after determining the electrical parameters of the pot body, a fitting relationship obtained by fitting the magnetic permeability, electrical conductivity and the temperature value of the pot body is obtained, so that the above fitting relationship can be used as a reference table for looking up the temperature value of the pot body, thereby determining the temperature value of the pot body.

[0090] In some technical schemes, optionally, the operating parameters include: a voltage signal acting on the target electromagnetic heating coil, a voltage waveform signal and a current waveform signal on the target electromagnetic heating coil, and the magnetic permeability and electrical conductivity of the pot body are determined according to the operating parameters, specifically including: determining the first harmonic sine and cosine components corresponding to the voltage waveform signal as the first component; determining the first harmonic sine and cosine components corresponding to the current waveform signal as the second component; determining the difference between the voltage signal and the first component; wherein the ratio of the second component to the difference is used to represent the magnetic permeability and electrical conductivity.

[0091] In some technical schemes, optionally, before obtaining the operating parameters of the target electromagnetic heating coil, it also includes: when the number of pot bodies is one and the target electromagnetic heating coil is one electromagnetic heating coil, driving the target electromagnetic heating coil to work; when the number of pot bodies is one and the target electromagnetic heating coils are two electromagnetic heating coils, driving the two electromagnetic heating coils to work alternately; when the number of pot bodies is one and the target electromagnetic heating coils are three electromagnetic heating coils, determining the first electromagnetic heating coil located in the middle of the three electromagnetic heating coils, and the remaining electromagnetic heating coils except the first electromagnetic heating coil, and driving the first electromagnetic heating coil and the remaining electromagnetic heating coils to work alternately; when the number of pot bodies is multiple and the target electromagnetic heating coils are multiple electromagnetic heating coils, and each pot body corresponds to one or more electromagnetic heating coils, measuring the temperature of the multiple pot bodies according to the number of electromagnetic heating coils corresponding to each of the pot bodies.

[0092] In this technical solution, when there is only one pot body and the target electromagnetic heating coil is one electromagnetic heating coil, only one electromagnetic heating coil works and there is no mutual interference. Therefore, the target electromagnetic heating coil can be directly driven to work to realize the detection of operating parameters.

[0093] When there are two target electromagnetic heating coils, the two electromagnetic heating coils are controlled to operate alternately to reduce mutual interference, thereby improving the accuracy of detection of operating parameters.

[0094] When there are three target electromagnetic heating coils, the first electromagnetic heating coil located in the middle and the remaining electromagnetic heating coils are determined so as to control the first electromagnetic heating coil and the remaining electromagnetic heating coils to work alternately, thereby eliminating interference.

[0095] In the case of multiple pots, the number of electromagnetic heating coils corresponding to each pot is determined, and then the scene of multiple pots is divided into multiple single pot temperature measurement scenes, so as to reduce and improve the temperature measurement efficiency.

[0096] In some technical solutions, optionally, the temperature of multiple pots is measured simultaneously.

[0097] According to a third aspect of the present invention, the present invention provides a temperature measuring device for a cooking device, the cooking device comprising: at least one electromagnetic heating coil, the at least one electromagnetic heating coil being used to couple with a pot body to heat the pot body, the temperature measuring device comprising: a first acquisition unit, used to acquire operating parameters of the target electromagnetic heating coil; a determination unit, used to determine the magnetic permeability and electrical conductivity of the pot body according to the operating parameters; a second acquisition unit, used to acquire a fitting relationship between the magnetic permeability, electrical conductivity and temperature value of the pot body; a processing unit, used to determine a target temperature value corresponding to the magnetic permeability and electrical conductivity according to the fitting relationship; and an output unit, used to output the target temperature value.

[0098] In this technical solution, during the process of the electromagnetic heating coil heating the pot body, the electrical parameters of the pot body are reflected to the electromagnetic heating coil through mutual inductance. The operating parameters of the target electromagnetic heating coil are obtained to obtain the electrical parameters of the cookware, and the electrical parameters of the pot body are obtained by analyzing them.

[0099] Among them, the above electrical parameters are also the operating parameters in this application.

[0100] Since the electrical parameters of the pot body are related to the temperature of the pot body, after determining the electrical parameters of the pot body, a fitting relationship obtained by fitting the magnetic permeability, electrical conductivity and the temperature value of the pot body is obtained, so that the above fitting relationship can be used as a reference table for looking up the temperature value of the pot body, thereby determining the temperature value of the pot body.

[0101] In some technical schemes, optionally, the operating parameters include: a voltage signal acting on the target electromagnetic heating coil, a voltage waveform signal and a current waveform signal on the target electromagnetic heating coil, and a determination unit is specifically used to: determine the first harmonic sine and cosine components corresponding to the voltage waveform signal as the first component; determine the first harmonic sine and cosine components corresponding to the current waveform signal as the second component; determine the difference between the voltage signal and the first component; wherein the ratio of the second component to the difference is used to represent the magnetic permeability and electrical conductivity.

[0102] In some technical schemes, optionally, the processing unit is also used to: when there is one pot body and the target electromagnetic heating coil is one electromagnetic heating coil, drive the target electromagnetic heating coil to work; when there is one pot body and the target electromagnetic heating coils are two electromagnetic heating coils, drive the two electromagnetic heating coils to work alternately; when there is one pot body and the target electromagnetic heating coils are three electromagnetic heating coils, determine the first electromagnetic heating coil located in the middle of the three electromagnetic heating coils, and the remaining electromagnetic heating coils except the first electromagnetic heating coil, and drive the first electromagnetic heating coil and the remaining electromagnetic heating coils to work alternately; when there are multiple pot bodies and the target electromagnetic heating coils are multiple electromagnetic heating coils, and each pot body corresponds to one or more electromagnetic heating coils, measure the temperature of the multiple pot bodies according to the number of electromagnetic heating coils corresponding to each of the pot bodies.

[0103] In this technical solution, when there is only one pot body and the target electromagnetic heating coil is one electromagnetic heating coil, only one electromagnetic heating coil works and there is no mutual interference. Therefore, the target electromagnetic heating coil can be directly driven to work to realize the detection of operating parameters.

[0104] When there are two target electromagnetic heating coils, the two electromagnetic heating coils are controlled to operate alternately to reduce mutual interference, thereby improving the accuracy of detection of operating parameters.

[0105] When there are three target electromagnetic heating coils, the first electromagnetic heating coil located in the middle and the remaining electromagnetic heating coils are determined so as to control the first electromagnetic heating coil and the remaining electromagnetic heating coils to work alternately, thereby eliminating interference.

[0106] In the case of multiple pots, the number of electromagnetic heating coils corresponding to each pot is determined, and then the scene of multiple pots is divided into multiple single pot temperature measurement scenes, so as to reduce and improve the temperature measurement efficiency.

[0107] In some technical solutions, optionally, the temperature of multiple pots is measured simultaneously.

[0108] According to a fourth aspect of the present invention, the present invention provides a temperature measuring device for cooking equipment, comprising a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the programs or instructions are executed by the processor, the steps of any of the methods described above are implemented.

[0109] According to a fifth aspect of the present invention, the present invention provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of any one of the methods described above are implemented.

[0110] According to a sixth aspect of the present invention, the present invention provides a cooking device, comprising: a temperature measuring device as described in any one of the above items; and / or a temperature measuring device as described in any one of the above cooking devices; and / or a readable storage medium as described above.

[0111] In some technical solutions, optionally, the cooking device includes an induction cooker.

[0112] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0113] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0114] Figure 1 A schematic block diagram of a temperature measuring device in an embodiment of the present invention is shown;

[0115] Figure 2 A schematic diagram of an excitation circuit of an electromagnetic heating coil in an embodiment of the present invention is shown;

[0116] Figure 3 A schematic block diagram of a wire drum in an embodiment of the present invention is shown;

[0117] Figure 4 The embodiment of the present invention is shown Figure 2 Schematic diagram of the equivalent model of the excitation circuit;

[0118] Figure 5 A topological schematic diagram of a first acquisition circuit in an embodiment of the present invention is shown;

[0119] Figure 6 A topological schematic diagram of a second acquisition circuit in an embodiment of the present invention is shown;

[0120] Figure 7 A topological schematic diagram of a third acquisition circuit in an embodiment of the present invention is shown;

[0121] Figure 8 A schematic flow chart of a method for measuring temperature of a cooking device according to an embodiment of the present invention is shown;

[0122] Fig. 9 A schematic block diagram of a cable drum working scene in an embodiment of the present invention is shown;

[0123] Fig.10 A schematic diagram of the cable drum working scene recognition in an embodiment of the present invention is shown;

[0124] Fig.11 A schematic block diagram of a temperature measuring device for a cooking device according to an embodiment of the present invention is shown;

[0125] Fig.12 A schematic block diagram of another temperature measuring device for cooking equipment in an embodiment of the present invention is shown.

[0126] in, Figures 1 to 7 The corresponding relationship between the reference numerals and the component names is as follows:

[0127] 100 temperature measuring device, 102 acquisition circuit, 104 control device, 1022 first acquisition circuit, U1 first subtraction circuit, Rt1 first feedback resistor, D1 first diode, D2 second diode, R1 first resistor, R2 second resistor, U2 first bias amplifier circuit, Rt2 second feedback resistor, Rx1 first current limiting resistor, Rs1 first voltage dividing resistor, Rs2 second voltage dividing resistor, C1 first capacitor, 1024 first selection circuit, 1026 second acquisition circuit, TL1 first current transformer, U3 second subtraction circuit, Rt3 third feedback resistor, Rs3 third voltage dividing resistor, Rs4 fourth voltage dividing resistor, D3 third diode, U4 third subtraction circuit, Rt4 fourth feedback resistor, Rx2 second limiting resistor current resistor, Rs5 fifth voltage-dividing resistor, Rs6 sixth voltage-dividing resistor, 1028 second selection circuit, 1030 third acquisition circuit, TL2 second current transformer, RL connection resistor, U5 fourth subtraction circuit, U6 second bias amplifier circuit, Rt5 fifth feedback resistor, Rx3 third current limiting resistor, Rs7 seventh voltage-dividing resistor, Rs8 eighth voltage-dividing resistor, C2 second capacitor, 1032 third selection circuit, IGBT1 first switch tube, IGBT2 second switch tube, Ld1 first electromagnetic heating coil, Ld2 second electromagnetic heating coil, REL1 first relay, REL2 second relay, C01 first working capacitor, C02 second working capacitor, C03 third working capacitor, C04 fourth working capacitor. DETAILED DESCRIPTION

[0128] In order to more clearly understand the above aspects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0129] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0130] In one embodiment of the present application, Figure 1As shown, a temperature measuring device 100 is provided for a cooking device, the cooking device comprising: at least one electromagnetic heating coil, the at least one electromagnetic heating coil being used to couple with a pot body to heat the pot body, the temperature measuring device 100 comprising: an acquisition circuit 102, for acquiring operating parameters of a target electromagnetic heating coil Ld; a control device 104, connected to the acquisition circuit, for determining the magnetic permeability and electrical conductivity of the pot body according to the operating parameters; acquiring a fitting relationship among the magnetic permeability, electrical conductivity and temperature value of the pot body; determining a target temperature value corresponding to the magnetic permeability and electrical conductivity according to the fitting relationship; and outputting the target temperature value.

[0131] The embodiment of the present application proposes a temperature measuring device 100. In the temperature measuring device 100, when the electromagnetic heating coil heats the pot body, the electrical parameters of the pot body are reflected to the electromagnetic heating coil through mutual inductance. The operating parameters of the target electromagnetic heating coil Ld are obtained to obtain the electrical parameters of the cookware. The electrical parameters of the pot body are obtained by analyzing them.

[0132] Among them, the above electrical parameters are also the operating parameters in this application.

[0133] Since the electrical parameters of the pot body are related to the temperature of the pot body, after determining the electrical parameters of the pot body, a fitting relationship obtained by fitting the magnetic permeability, electrical conductivity and the temperature value of the pot body is obtained, so that the above fitting relationship can be used as a reference table for looking up the temperature value of the pot body, thereby determining the temperature value of the pot body.

[0134] In the above embodiment, the temperature measuring device 100 can be used to measure the temperature of the pot body. Compared with the related embodiments, there is no need to use an NTC thermistor to measure the temperature. Therefore, the error existing when the NTC thermistor is used to measure the temperature of the pot body is reduced, that is, the accuracy of temperature measurement is improved, so as to achieve precise temperature control cooking, low temperature cooking, and water boiling detection.

[0135] In the above-mentioned embodiments, the NTC thermistor used in the relevant embodiments to measure the temperature is an indirect temperature sampling, so the result of the temperature measurement has a hysteresis, while in the embodiment of the present application, as the target electromagnetic heating coil Ld heats the pot body, the operating parameters of the pot body can be measured, thereby realizing the measurement of the temperature value of the pot body. Therefore, the temperature value measured based on the embodiment of the present application has the characteristic of low hysteresis, that is, the temperature value of the pot body measured by the present application can reflect the real-time temperature of the pot body to a large extent in real time, so as to perform precise temperature control cooking, low temperature cooking, and water boiling detection based on the measured temperature value.

[0136] In some embodiments, optionally, the electromagnetic heating coil can be understood as a wire coil, which can form a changing magnetic field when a changing power supply is passed through it, so that the pot body located in the above magnetic field forms eddy currents to achieve heating of the pot body.

[0137] In some embodiments, optionally, the above fitting relationship can be obtained by performing experimental tests on different pots after the temperature measuring device 100 is assembled into the cooking device, and can be written into the control device before the cooking device leaves the factory so that the control device can read it.

[0138] In some embodiments, optionally, the operating parameters include: a voltage signal acting on the target electromagnetic heating coil Ld, a voltage waveform signal and a current waveform signal on the target electromagnetic heating coil Ld, and the control device 104 is specifically used to: determine the first harmonic sine and cosine component corresponding to the voltage waveform signal as the first component; determine the first harmonic sine and cosine component corresponding to the current waveform signal as the second component; determine the difference between the voltage signal and the first component; wherein the ratio of the second component to the difference is used to represent the magnetic permeability and electrical conductivity.

[0139] Figure 2 The excitation circuit of the electromagnetic heating coil is shown, as Figure 2 As shown, the voltage between the first input terminal and the second input terminal of the excitation circuit is VCC, which includes: a first switching tube IGBT1, a second switching tube IGBT2, a first electromagnetic heating coil Ld1, a second electromagnetic heating coil Ld2, a first relay REL1, a second relay REL2, a first working capacitor C01, a second working capacitor C02, a third working capacitor C03 and a fourth working capacitor C04.

[0140] Among them, the first end of the first switch tube IGBT1 is connected to the first input end of the excitation circuit, the second end of the first switch tube IGBT1 is connected to the first end of the second switch tube IGBT2, the second end of the second switch tube IGBT2 is connected to the second input end of the excitation circuit, the first end of the second switch tube IGBT2 is respectively connected to the first end of the first electromagnetic heating coil Ld1 and the first end of the second electromagnetic heating coil Ld2, the second end of the first electromagnetic heating coil Ld1 is connected to the first end of the first relay REL1, the second end of the second electromagnetic heating coil Ld2 is connected to the first end of the second relay REL2, the second end of the first relay REL1 is connected to the third working capacitor C03 and the fourth working capacitor C04 Connection, that is, the first end of the third working capacitor C03 is connected to the first input end of the excitation circuit, the second end of the third working capacitor C03 is connected to the second end of the first relay REL1 and the first end of the fourth working capacitor C04, the second end of the fourth working capacitor C04 is connected to the second input end of the excitation circuit, the second end of the second relay REL2 is connected to the first working capacitor C01 and the second working capacitor C02, that is, the first end of the first working capacitor C01 is connected to the first input end of the excitation circuit, the second end of the first working capacitor C01 is connected to the second end of the second electromagnetic heating coil Ld2 and the first end of the second working capacitor C02, and the second end of the second working capacitor C02 is connected to the second input end of the excitation circuit.

[0141] The operation of one or both of the first electromagnetic heating coil Ld1 and the second electromagnetic heating coil Ld2 can be realized by controlling the opening and closing of one or both of the first relay REL1 and the second relay REL2, so as to heat the pot body.

[0142] In some embodiments, optionally, Figure 3 As shown, in the case where the cooking device includes 6 electromagnetic heating coils, the number of the above-mentioned excitation circuits is 3, that is, the first electromagnetic heating coil Ld1 and the second electromagnetic heating coil Ld2 require a group of excitation circuits, the third electromagnetic heating coil and the fourth electromagnetic heating coil require a group of excitation circuits, and the fifth electromagnetic heating coil and the sixth electromagnetic heating coil require a group of excitation circuits.

[0143] Among them, by setting the first current transformer TL1 and the second current transformer TL2 in the above-mentioned excitation circuit, such as being inserted into the cable drum current loop, so as to utilize the second current transformer TL2 to realize the measurement of the initial current Is waveform of the cable drum, that is, the current waveform signal, and using the first current transformer TL1 to obtain the current derivative Us=Ldi / dt to obtain the voltage waveform (initial voltage of the cable drum), that is, the voltage waveform signal.

[0144] Among them, the voltage signal acting on the target electromagnetic heating coil Ld can be understood as the changing voltage waveform induced by the voltage division on both sides of the target electromagnetic heating coil Ld (this waveform contains the heating thermal resistance and the thermal resistance reflected back from the pot), that is, the voltage signal.

[0145] In some embodiments, optionally, the first current transformer TL1 and the second current transformer TL2 are disposed on a control panel of the cooking device.

[0146] Figure 4 Shows Figure 2 Schematic diagram of the equivalent model of the excitation circuit, wherein the pot body is also the cooker, and the cooker is equivalent to Lz (magnetic permeability) and Rz (electrical conductivity), the equivalent resistance of the target electromagnetic heating coil Ld is Rs, the current coil (also the second current transformer TL2) is used to measure the current on Ld, the differential coil (also the first current transformer TL1) is used to measure the voltage on Ld, and TL1 and TL2 are respectively mounted on the target electromagnetic heating coil Ld.

[0147] based on Figure 4 , then the KVC and KCL equations of the target electromagnetic heating coil Ld and the metal cookware are:

[0148] Vs=Rs×i1+jωLd×i1+jωM×iz; (1)

[0149] 0 = jωM×i1 + jωLz×iz + Rz×iz; (2)

[0150] Among them, Lz is the magnetic permeability, Vs is the voltage signal on the target electromagnetic heating coil Ld, i1 is the current on the target electromagnetic heating coil Ld, M is related to L1, iz is the equivalent current on the cooker, Rz is the equivalent resistance on the cooker, j is the sign in the imaginary part, L1 is the inductance of the electromagnetic heating coil (also known as the excitation coil), and M is the mutual inductance coefficient.

[0151] Substituting iz in equation (2) into equation (1), we can obtain You can get In fact, the Rs internal resistance of the target electromagnetic heating coil Ld is very small and can be ignored. The expression of the electrical parameters of the cooker can be converted into:

[0152] In order to measure Lz and Rz separately, the formula (3) is inverted to obtain represent The real part of the network admittance represented by express The imaginary part of the network admittance, that is, the magnetic permeability and electrical conductivity of the cookware can be measured separately by measuring the real part and imaginary part of the network port.

[0153] Among them, Vs is the voltage signal obtained by the voltage divider resistor, that is, the voltage signal on the target electromagnetic heating coil Ld, jωLd×i1 is the coil voltage waveform obtained by derivation of TL1, and i1 is the current waveform measured by the current transformer (Ld is the coil, the parameters are fixed, ω is the angular frequency, the parameters are fixed, and M is the mutual inductance, which can be fixed by fixed position and load).

[0154] In this embodiment, the calculation is performed by selecting the first harmonic sine and cosine components to reduce the amount of calculation.

[0155] In some embodiments, optionally, Figure 5 As shown, the acquisition circuit 102 includes a first acquisition circuit 1022, and the first acquisition circuit 1022 includes: a first subtraction circuit U1, the inverting input terminal and the non-phase input terminal of the first subtraction circuit U1 are respectively connected to the two ends of the target electromagnetic heating coil Ld; a first feedback resistor Rt1, located between the inverting input terminal of the first subtraction circuit U1 and the output terminal of the first subtraction circuit U1, and the output terminal of the first subtraction circuit U1 is used to output a voltage signal.

[0156] In this embodiment, since the inverting input terminal and the non-inverting input terminal of the first subtraction circuit U1 are respectively connected to the two ends of the target electromagnetic heating coil Ld, a complete AC waveform, ie, a voltage signal, can be obtained under the operation of the first subtraction circuit U1.

[0157] By setting the first feedback resistor Rt1, the waveform amplitude of the complete AC waveform can be adjusted to obtain an AC waveform that meets the needs of the user.

[0158] In some embodiments, optionally, the value of the first feedback resistor Rt1 can be determined according to actual use requirements, which will not be described in detail here.

[0159] In some embodiments, optionally, the first acquisition circuit 1022 also includes: a first diode D1, the anode of the first diode D1 is connected to the inverting input terminal of the first subtraction circuit U1, and the cathode of the first diode D1 is connected to the first power supply; and / or a second diode D2, the anode of the second diode D2 is connected to the non-inverting input terminal of the first subtraction circuit U1, and the cathode of the second diode D2 is connected to the first power supply.

[0160] In this embodiment, the first diode D1 is provided so that when the voltage connected to the reverse input terminal of the first subtraction circuit U1 is too high, the first diode D1 is used to clamp the input voltage to the voltage of the first power supply, thereby reducing the probability of the first subtraction circuit U1 being damaged due to the excessively high voltage connected, thereby improving the reliability of the temperature measuring device 100.

[0161] In some embodiments, optionally, the voltage output by the first power supply can be determined according to actual design requirements, which will not be described in detail here.

[0162] In some embodiments, optionally, a second diode D2 is provided so that when the voltage connected to the forward input terminal of the first subtraction circuit U1 is too high, the first diode D1 is used to clamp the input voltage at the voltage of the ground point, thereby reducing the probability of the first subtraction circuit U1 being damaged due to the excessively high voltage connected thereto, thereby improving the reliability of the temperature measuring device 100.

[0163] In some embodiments, optionally, the first acquisition circuit 1022 is provided with a first diode D1 , a second diode D2 , or the first diode D1 and the second diode D2 are provided at the same time.

[0164] In some embodiments, optionally, the first acquisition circuit 1022 also includes: a first resistor R1, a first end of the first resistor R1 is connected to the inverting input end of the first subtraction circuit U1, and a second end of the first resistor R1 is grounded; and / or a second resistor R2, a first end of the second resistor R2 is connected to the non-inverting input end of the first subtraction circuit U1, and a second end of the second resistor R2 is grounded.

[0165] In this embodiment, the first resistor R1 is set so that the first resistor R1 is connected to one end of the target electromagnetic heating coil Ld and the grounding point to form a loop, so that the voltage on the first resistor R1 is used as the input of the inverting input terminal of the first subtraction circuit U1, so as to reduce the voltage value input to the first subtraction circuit U1, thereby reducing the probability of the first subtraction circuit U1 being damaged due to the excessively high voltage connected, thereby improving the reliability of the temperature measuring device 100.

[0166] Similarly, by setting the second resistor R2 so that the second resistor R2 is connected to one end of the target electromagnetic heating coil Ld and the grounding point to form a loop, the voltage on the second resistor R2 is used as the input of the positive input terminal of the first subtraction circuit U1, so as to reduce the voltage value input to the first subtraction circuit U1, thereby reducing the probability of the first subtraction circuit U1 being damaged due to excessively high voltage, thereby improving the reliability of the temperature measuring device 100.

[0167] In some embodiments, optionally, the first acquisition circuit 1022 is provided with a first resistor R1, a second resistor R2, or the first resistor R1 and the second resistor R2 are provided at the same time.

[0168] In some embodiments, optionally, the first acquisition circuit 1022 also includes: a first bias amplifier circuit U2, a negative phase input terminal of the first bias amplifier circuit U2 is connected to the output terminal of the first subtraction circuit U1, a positive phase input terminal of the first bias amplifier circuit U2 is connected to the first power supply, and the output terminal of the first bias amplifier circuit U2 is used to output a biased voltage signal; a second feedback resistor Rt2, located between the inverting input terminal of the first bias amplifier circuit U2 and the output terminal of the first bias amplifier circuit U2.

[0169] In this embodiment, the first bias circuit is provided so as to utilize the first bias circuit to amplify the weak Vs waveform of the mains zero-crossing window, thereby selectively acquiring the voltage signal. In this process, the voltage interference accompanying the voltage signal can be reduced.

[0170] In the above embodiment, the second feedback resistor Rt2 is provided so that the first bias circuit can be adjusted according to actual use requirements, thereby making personalized adjustments to ensure the reliability of the results output by the temperature measuring device 100 .

[0171] In some embodiments, optionally, the first acquisition circuit 1022 further includes: a first current limiting resistor Rx1 located between the output end of the first subtraction circuit U1 and the negative phase input end of the first bias amplifier circuit U2.

[0172] In this embodiment, a first current limiting resistor Rx1 is provided so as to utilize the first current limiting resistor Rx1 to limit the current connected to the first bias amplifier circuit U2, thereby reducing the probability of excessive current connected to the first bias amplifier circuit U2 and causing the first bias amplifier circuit U2 to be damaged due to overcurrent, thereby ensuring the reliability of the output result of the temperature measuring device 100.

[0173] In some embodiments, the value of the first current limiting resistor Rx1 can be determined according to actual usage requirements, which will not be described in detail here.

[0174] In some embodiments, optionally, the first acquisition circuit 1022 also includes: a first voltage-dividing resistor Rs1, located between the first power supply and the non-phase input terminal of the first bias amplifier circuit U2; a second voltage-dividing resistor Rs2, the first end of the second voltage-dividing resistor Rs2 is connected to the non-phase input terminal of the first bias amplifier circuit U2, and the second end of the second voltage-dividing resistor Rs2 is grounded.

[0175] In this embodiment, the first voltage-dividing resistor Rs1 and the second voltage-dividing resistor Rs2 are connected in series and connected between the first power supply and the ground, so that a loop is formed between the first power supply and the ground. Since the non-inverting input terminal of the first bias amplifier circuit U2 is connected to the first end of the second voltage-dividing resistor Rs2, the first power supply is no longer connected to the first bias amplifier circuit U2, but a voltage value selected according to actual design requirements.

[0176] In the above embodiment, the resistance values ​​of the first voltage-dividing resistor Rs1 and the second voltage-dividing resistor Rs2 can be selected according to actual design requirements so as to input a signal to the first bias amplifier circuit U2. In this process, the requirements of the temperature measuring circuit on the output voltage of the first power supply can be reduced, thereby facilitating the reduction of the cost of the temperature measuring device 100.

[0177] In some embodiments, optionally, the first acquisition circuit 1022 further includes: a first capacitor C1 , and the first capacitor C1 is connected in parallel with the second feedback resistor Rt2 .

[0178] In this embodiment, the first capacitor C1 is provided, which can be used as a low-pass filter to suppress interference of high-frequency signals, so that the first capacitor C1 can be used to implement high-frequency response control of the first bias amplifier circuit U2, thereby improving the working stability of the first bias amplifier circuit U2.

[0179] In addition, the value of the first capacitor C1 can be determined according to actual design requirements, so as to improve the response speed of the first bias amplifier circuit U2.

[0180] In some embodiments, optionally, it further includes: a first selection circuit 1024 connected to at least one electromagnetic heating coil and the first acquisition circuit 1022, and used to select a target electromagnetic heating coil.

[0181] In this embodiment, a first selection circuit 1024 is provided so that the first selection circuit 1024 can be used to connect at least one electromagnetic heating coil and the first acquisition circuit 1022. In this process, at least one electromagnetic heating coil can share the same first acquisition circuit 1022 to collect and process voltage signals, so as to reduce the complexity of the temperature measuring device 100.

[0182] In some embodiments, optionally, the first selection circuit 1024 can be a set of single-pole multi-throw switches, specifically, the set of single-pole multi-throw switches includes a first single-pole multi-throw switch and a second single-pole multi-throw switch. The static contacts of the first single-pole multi-throw switch and the second single-pole multi-throw switch are respectively connected to the two ends of the corresponding electromagnetic heating coil, and the moving contacts of the first single-pole multi-throw switch and the second single-pole multi-throw switch are connected to the first acquisition circuit 1022.

[0183] In some embodiments, optionally, Figure 6As shown, the acquisition circuit 102 includes a second acquisition circuit 1026, and the second acquisition circuit 1026 includes: a first current transformer TL1, located in an excitation circuit where at least one electromagnetic heating coil is located; a second subtraction circuit U3, the positive phase input terminal and the negative phase input terminal of the second subtraction circuit U3 are connected to the first output terminal and the second output terminal of the first current transformer TL1, and the output terminal of the second subtraction circuit U3 is used to output a voltage waveform signal; a third feedback resistor Rt3, located between the positive phase input terminal of the second subtraction circuit U3 and the output terminal of the second subtraction circuit U3.

[0184] In this embodiment, due to the connection between the second subtraction circuit U3 and the first current transformer TL1, the voltage waveform jωLd×i1, ie, the voltage waveform signal, can be obtained by using the differential coil of the first current transformer TL1.

[0185] Among them, by setting the third feedback resistor Rt3, the amplification factor of jωLd×i1 is adjusted by using the third feedback resistor Rt3, so as to meet Vs-jωLd×i1=0 when there is no pot (because no pot means mutual inductance 0, for each wire coil, the control chip records Vs-jωLd×i1 when there is no pot, so as to subtract the reference value when placing the pot). When placing the pot, Vs-jωLd×i1≠0, that is, the AD-Us waveform is not a straight line, and the AD-Us waveform (representing Vs-jωLd×i1) is sent to the control device.

[0186] In some embodiments, optionally, the second acquisition circuit 1026 also includes: a third voltage-dividing resistor Rs3, a first end of the third voltage-dividing resistor Rs3 is connected to the positive phase input terminal of the second subtraction circuit U3, and a second end of the third voltage-dividing resistor Rs3 is connected to the first power supply; and / or a fourth voltage-dividing resistor Rs4, a first end of the fourth voltage-dividing resistor Rs4 is connected to the negative phase input terminal of the second subtraction circuit U3, and a second end of the fourth voltage-dividing resistor Rs4 is grounded.

[0187] In this embodiment, the third voltage-dividing resistor Rs3 is provided so that the first output end of the first current transformer TL1 can form a loop with the first power supply through the third voltage-dividing resistor Rs3, thereby adjusting the voltage input to the positive input end of the second subtraction circuit U3. In this process, a reasonable resistance value can be selected for the third voltage-dividing resistor Rs3 so as to limit the voltage connected to the positive input end of the second subtraction circuit U3.

[0188] Similarly, by setting the fourth voltage-dividing resistor Rs4, the second output end of the first current transformer TL1 can form a loop with the ground through the fourth voltage-dividing resistor Rs4, thereby adjusting the voltage input to the inverting input end of the second subtraction circuit U3. In this process, a reasonable resistance value can be selected for the fourth voltage-dividing resistor Rs4 to limit the voltage connected to the inverting input end of the second subtraction circuit U3.

[0189] In some embodiments, optionally, the second acquisition circuit 1026 further includes: a third diode D3, wherein an anode of the third diode D3 is connected to the non-inverting input terminal of the second subtraction circuit U3, and a cathode of the third diode D3 is connected to the first power supply.

[0190] In this embodiment, the third diode D3 is provided so as to clamp the voltage connected to the non-inverting input terminal of the second subtraction circuit U3 by the third diode D3, thereby reducing the probability of the second subtraction circuit U3 being damaged due to overvoltage caused by excessive voltage connected.

[0191] Specifically, when the input voltage is greater than the sum of the first power supply and the conduction voltage of the third diode D3, the third diode D3 is turned on. At this time, the input voltage is pulled down to the voltage of the first power supply.

[0192] In some embodiments, optionally, the acquisition circuit also includes: a third subtraction circuit U4, the inverting input terminal of the third subtraction circuit U4 is connected to the output terminal of the second subtraction circuit U3, the non-phase input terminal of the third subtraction circuit U4 is connected to the output terminal of the first subtraction circuit U1, and the output terminal of the third subtraction circuit U4 is used to output the difference between the voltage signal and the first component; a fourth feedback resistor Rt4, located between the non-phase input terminal of the third subtraction circuit U4 and the output terminal of the third subtraction circuit U4.

[0193] In this embodiment, the third subtraction circuit U4 is provided so as to utilize the third subtraction circuit U4 to realize direct calculation of Vs-jωLd×i1. In this process, no calculation is required in the control device, thereby improving the response speed in the temperature measurement control process.

[0194] In some embodiments, optionally, the third subtraction circuit U4 further includes: a second current limiting resistor Rx2 located between the inverting input terminal of the third subtraction circuit U4 and the output terminal of the second subtraction circuit U3.

[0195] In this embodiment, a second current limiting resistor Rx2 is provided so as to utilize the second current limiting resistor Rx2 to limit the current connected to the third subtraction circuit U4, thereby reducing the probability of excessive current connected to the third subtraction circuit U4 and causing the third subtraction circuit U4 to be damaged due to overcurrent, thereby ensuring the reliability of the output result of the temperature measuring device 100.

[0196] In some embodiments, the value of the second current limiting resistor Rx2 can be determined according to actual usage requirements, which will not be described in detail here.

[0197] In some embodiments, optionally, the third subtraction circuit U4 further includes: a fifth voltage-dividing resistor Rs5, located between the output end of the first subtraction circuit U1 and the non-phase input end of the third subtraction circuit U4; a sixth voltage-dividing resistor Rs6, wherein the first end of the sixth voltage-dividing resistor Rs6 is connected to the non-phase input end of the third subtraction circuit U4, and the second end of the sixth voltage-dividing resistor Rs6 is grounded.

[0198] In this embodiment, the fifth voltage-dividing resistor Rs5 and the sixth voltage-dividing resistor Rs6 are connected in series and then connected between the output end of the first subtraction circuit U1 and the ground. Therefore, the voltage outputted from the output end of the first subtraction circuit U1 can be inputted to the third subtraction circuit U4 by using the fifth voltage-dividing resistor Rs5 and the sixth voltage-dividing resistor Rs6.

[0199] In this process, the voltage value input to the non-phase input terminal of the third subtraction circuit U4 can be adjusted, and current limiting control is also implemented to reduce the probability of damage to the third subtraction circuit U4 due to overcurrent and overvoltage due to excessive current, thereby improving the reliability of the temperature measuring device 100.

[0200] In some embodiments, optionally, the fifth voltage-dividing resistor Rs5 and the sixth voltage-dividing resistor Rs6 can be set according to actual use requirements, which will not be described in detail here.

[0201] In some embodiments, optionally, it further includes: a second selection circuit 1028, which is provided in the excitation circuit where at least one electromagnetic heating coil is located, and is used to select the excitation circuit where the target electromagnetic heating coil is located.

[0202] In this embodiment, a second selection circuit 1028 is provided so that the second selection circuit 1028 can be used to connect the excitation circuit to be measured by the second acquisition circuit 1026. In this process, multiple excitation circuits can share the same second acquisition circuit 1026 to reduce the complexity of the temperature measuring device 100.

[0203] In some embodiments, optionally, the second selection circuit 1028 may be a set of single-pole multi-throw switches, specifically, a set of single-pole multi-throw switches includes a third single-pole multi-throw switch and a fourth single-pole multi-throw switch. The static contacts of the third single-pole multi-throw switch and the fourth single-pole multi-throw switch are respectively connected to the first end and the second end of the corresponding first current transformer TL1, and the moving contacts of the third single-pole multi-throw switch and the fourth single-pole multi-throw switch are connected to the second acquisition circuit 1026.

[0204] In some embodiments, optionally, Figure 7As shown, the acquisition circuit includes a third acquisition circuit 1030, and the third acquisition circuit includes: a second current transformer TL2, located in an excitation circuit where at least one electromagnetic heating coil is located; a connecting resistor RL, located between the first output terminal and the second output terminal of the second current transformer TL2, and one end of the connecting resistor RL is grounded; a fourth subtraction circuit U5, the positive phase input terminal of the fourth subtraction circuit U5 is connected to the other end of the connecting resistor RL, the negative phase input terminal of the fourth subtraction circuit U5 is connected to the output terminal of the fourth subtraction circuit U5, and the output terminal of the fourth subtraction circuit U5 is used to output a current waveform signal.

[0205] In this embodiment, the second current transformer TL2 is provided to obtain the current waveform signal, and the connecting resistor RL is provided to express the current waveform signal in the form of voltage, which is then outputted by the fourth subtraction circuit U5.

[0206] In this process, the fourth subtraction circuit U5 can be understood as a follower.

[0207] In some embodiments, optionally, the third acquisition circuit also includes: a second bias amplifier circuit U6, a negative phase input terminal of the second bias amplifier circuit U6 is connected to the output terminal of the fourth subtraction circuit U5, a positive phase input terminal of the second bias amplifier circuit U6 is connected to the first power supply, and the output terminal of the second bias amplifier circuit U6 is used to output a biased current waveform signal; a fifth feedback resistor Rt5, located between the inverting input terminal of the second bias amplifier circuit U6 and the output terminal of the second bias amplifier circuit U6.

[0208] In this embodiment, a second bias amplifier circuit U6 is provided so as to use the second bias amplifier circuit U6 to bias and amplify the current waveform signal, thereby obtaining a current waveform signal corresponding to the voltage waveform signal, so as to perform Calculation.

[0209] Specifically, the first output terminal and the second output terminal of the second current transformer TL2 are connected to Is+ and Is- respectively, and AD-Is is obtained after bias amplification to represent i1.

[0210] In some embodiments, optionally, the third acquisition circuit further includes: a third current limiting resistor Rx3, located between the inverting input terminal of the fourth subtraction circuit U5 and the negative input terminal of the second bias amplifier circuit U6.

[0211] In this embodiment, the third current limiting resistor Rx3 is provided so as to limit the current flowing into the second bias amplifier circuit U6 by the third current limiting resistor Rx3, thereby reducing the probability of the second bias amplifier circuit U6 being damaged due to excessive current flowing therein, thereby improving the reliability of the temperature measuring device 100.

[0212] In some embodiments, optionally, the value of the third current limiting resistor Rx3 can be determined according to actual design requirements, which will not be described in detail here.

[0213] In some embodiments, optionally, the third acquisition circuit also includes: a seventh voltage-dividing resistor Rs7, located between the first power supply and the non-phase input terminal of the second bias amplifier circuit U6; an eighth voltage-dividing resistor Rs8, the first end of the eighth voltage-dividing resistor Rs8 is connected to the non-phase input terminal of the second bias amplifier circuit U6, and the second end of the eighth voltage-dividing resistor Rs8 is grounded.

[0214] In this embodiment, the seventh voltage-dividing resistor Rs7 and the eighth voltage-dividing resistor Rs8 are provided so that the first power supply can form a loop with the ground through the seventh voltage-dividing resistor Rs7 and the eighth voltage-dividing resistor Rs8, thereby adjusting the voltage input to the second bias amplifier circuit U6. In this process, reasonable resistance values ​​can be selected for the seventh voltage-dividing resistor Rs7 and the eighth voltage-dividing resistor Rs8 to reduce the probability of damage to the second bias amplifier circuit U6 due to overvoltage.

[0215] In some embodiments, optionally, the third acquisition circuit further includes: a second capacitor C2 connected in parallel with the fifth feedback resistor Rt5.

[0216] In this embodiment, by setting the second capacitor C2, it can be used as a low-pass filter to suppress the interference of high-frequency signals, so that the second capacitor C2 can be used to implement high-frequency response control of the second bias amplifier circuit U6, thereby improving the working stability of the second bias amplifier circuit U6.

[0217] In addition, the value of the second capacitor C2 can be determined according to actual design requirements, so as to improve the response speed of the second bias amplifier circuit U6.

[0218] In some embodiments, optionally, the third acquisition circuit further includes: a third selection circuit 1032, which is provided in the excitation circuit where at least one electromagnetic heating coil is located, and is used to select the excitation circuit where the target electromagnetic heating coil is located.

[0219] In this embodiment, a third selection circuit 1032 is provided so that the third selection circuit 1032 can be used to connect the excitation circuit to be measured by the third acquisition circuit. In this process, multiple excitation circuits can share the same third acquisition circuit to reduce the complexity of the temperature measuring device 100.

[0220] In some embodiments, optionally, the third selection circuit 1032 may be a set of single-pole multi-throw switches, specifically, a set of single-pole multi-throw switches includes a fifth single-pole multi-throw switch and a sixth single-pole multi-throw switch. The static contacts of the fifth single-pole multi-throw switch and the sixth single-pole multi-throw switch are respectively connected to the first end and the second end of the corresponding second current transformer TL2, and the moving contacts of the fifth single-pole multi-throw switch and the sixth single-pole multi-throw switch are connected to the third acquisition circuit.

[0221] In one embodiment, if Figure 8 As shown, a temperature measurement method for a cooking device is provided, the cooking device comprises: at least one electromagnetic heating coil, the at least one electromagnetic heating coil is used to couple with a pot body to heat the pot body, and the temperature measurement method comprises:

[0222] Step 802, obtaining the operating parameters of the target electromagnetic heating coil;

[0223] Step 804, determining the magnetic permeability and electrical conductivity of the pot body according to the operating parameters;

[0224] Step 806, obtaining a fitting relationship between magnetic permeability, electrical conductivity and the temperature value of the pot body;

[0225] Step 808, determining the target temperature value corresponding to the magnetic permeability and the electrical conductivity according to the fitting relationship;

[0226] Step 810: output the target temperature value.

[0227] In this embodiment, during the process of the electromagnetic heating coil heating the pot body, the electrical parameters of the pot body are reflected to the electromagnetic heating coil through mutual inductance. The operating parameters of the target electromagnetic heating coil are obtained so as to acquire the electrical parameters of the cookware, and the electrical parameters of the pot body are obtained by analyzing them.

[0228] Among them, the above electrical parameters are also the operating parameters in this application.

[0229] Since the electrical parameters of the pot body are related to the temperature of the pot body, after determining the electrical parameters of the pot body, a fitting relationship obtained by fitting the magnetic permeability, electrical conductivity and the temperature value of the pot body is obtained, so that the above fitting relationship can be used as a reference table for looking up the temperature value of the pot body, thereby determining the temperature value of the pot body.

[0230] In some embodiments, optionally, the operating parameters include: a voltage signal acting on the target electromagnetic heating coil, a voltage waveform signal and a current waveform signal on the target electromagnetic heating coil, and the magnetic permeability and electrical conductivity of the pot body are determined according to the operating parameters, specifically including: determining the first harmonic sine and cosine components corresponding to the voltage waveform signal as the first component; determining the first harmonic sine and cosine components corresponding to the current waveform signal as the second component; determining the difference between the voltage signal and the first component; wherein the ratio of the second component to the difference is used to represent the magnetic permeability and electrical conductivity.

[0231] In some embodiments, optionally, before obtaining the operating parameters of the target electromagnetic heating coil, it also includes: when the number of pot bodies is one and the target electromagnetic heating coil is one electromagnetic heating coil, driving the target electromagnetic heating coil to work; when the number of pot bodies is one and the target electromagnetic heating coils are two electromagnetic heating coils, driving the two electromagnetic heating coils to work alternately; when the number of pot bodies is one and the target electromagnetic heating coils are three electromagnetic heating coils, determining the first electromagnetic heating coil located in the middle of the three electromagnetic heating coils, and the remaining electromagnetic heating coils except the first electromagnetic heating coil, and driving the first electromagnetic heating coil and the remaining electromagnetic heating coils to work alternately; when the number of pot bodies is multiple and the target electromagnetic heating coil is multiple electromagnetic heating coils, and each pot body corresponds to one or more electromagnetic heating coils, measuring the temperature of the multiple pot bodies according to the number of electromagnetic heating coils corresponding to each of the pot bodies.

[0232] In this embodiment, when there is only one pot body and the target electromagnetic heating coil is one electromagnetic heating coil, only one electromagnetic heating coil works and there is no mutual interference. Therefore, the target electromagnetic heating coil can be directly driven to work to realize the detection of operating parameters.

[0233] When there are two target electromagnetic heating coils, the two electromagnetic heating coils are controlled to operate alternately to reduce mutual interference, thereby improving the accuracy of detection of operating parameters.

[0234] When there are three target electromagnetic heating coils, the first electromagnetic heating coil located in the middle and the remaining electromagnetic heating coils are determined so as to control the first electromagnetic heating coil and the remaining electromagnetic heating coils to work alternately, thereby eliminating interference.

[0235] In the case of multiple pots, the number of electromagnetic heating coils corresponding to each pot is determined, and then the scene of multiple pots is divided into multiple single pot temperature measurement scenes, so as to reduce and improve the temperature measurement efficiency.

[0236] In some embodiments, optionally, multiple pots are simultaneously temperature measured. Fig. 9and Fig.10 As shown, in the embodiment of the present application, the temperature measuring device can only measure the temperature of the same pot body and the same electromagnetic heating coil at the same time. Figure 3 The following scenarios are divided into three situations: one is that only one of a group of wire reels works at the same time, for example, wire reel 5 or wire reel 6 works; the second is that two wire reels are heated at the same time; the third is that more than or equal to 3 wire reels are heated at the same time.

[0237] Specifically, the logic is as follows:

[0238] The first step is to find out the number and location of the pots being heated (there are many solutions, such as switching relays to check the pots one by one, etc.). The scenario is as follows: Fig. 9 As shown, there are single pot with one wire reel heating, single pot with two wire reels heating, single pot with three wire reels heating and two pots heating.

[0239] For the "single pot and one wire reel heating" scenario, just start the corresponding wire reel temperature measurement.

[0240] For the "single pot two wire reels heating" scenario, wire reel 1 is stopped for a certain time ratio (20ms~1s), and temperature measurement of wire reel 2 is started. After the temperature measurement is completed, the heating of the two wire reels is restarted.

[0241] For the "single pot three wire reels heating" scenario, first find the wire reel 2 in the center of the pot, stop wire reels 1 and 3 for a certain time ratio (20ms~1s), start temperature measurement of wire reel 2, and restart the three wire reels to continue heating after the temperature measurement is completed.

[0242] For the "two pots heating" scenario, two pots work at the same time. Fig.10 As shown, it is equivalent to "single pot with one wire reel heating" and "single pot with three wire reels heating".

[0243] In one embodiment, if Fig.11 As shown, a temperature measuring device 1100 for a cooking device is provided, the cooking device comprising: at least one electromagnetic heating coil, the at least one electromagnetic heating coil being used to couple with a pot body to heat the pot body, the temperature measuring device comprising: a first acquisition unit 1102, used to acquire the operating parameters of the target electromagnetic heating coil; a determination unit 1104, used to determine the magnetic permeability and electrical conductivity of the pot body according to the operating parameters; a second acquisition unit 1106, used to acquire the fitting relationship between the magnetic permeability, electrical conductivity and the temperature value of the pot body; a processing unit 1108, used to determine the target temperature value corresponding to the magnetic permeability and electrical conductivity according to the fitting relationship; and an output unit 1110, used to output the target temperature value.

[0244] In this embodiment, when the electromagnetic heating coil heats the pot, the electrical parameters of the pot are reflected to the electromagnetic heating coil through mutual inductance, and the electrical parameters of the pot are obtained by obtaining the operating parameters of the target electromagnetic heating coil, and the electrical parameters of the pot are obtained by analyzing them. The electrical parameters are also the operating parameters in this application.

[0245] Since the electrical parameters of the pot body are related to the temperature of the pot body, after determining the electrical parameters of the pot body, a fitting relationship obtained by fitting the magnetic permeability, electrical conductivity and the temperature value of the pot body is obtained, so that the above fitting relationship can be used as a reference table for looking up the temperature value of the pot body, thereby determining the temperature value of the pot body.

[0246] In some embodiments, optionally, the operating parameters include: a voltage signal acting on the target electromagnetic heating coil, a voltage waveform signal and a current waveform signal on the target electromagnetic heating coil, and the determination unit 1104 is specifically used to: determine the first harmonic sine and cosine components corresponding to the voltage waveform signal as the first component; determine the first harmonic sine and cosine components corresponding to the current waveform signal as the second component; determine the difference between the voltage signal and the first component; wherein the ratio of the second component to the difference is used to represent the magnetic permeability and electrical conductivity.

[0247] In some embodiments, optionally, the processing unit 1108 is also used to: when there is one pot body and the target electromagnetic heating coil is one electromagnetic heating coil, drive the target electromagnetic heating coil to work; when there is one pot body and the target electromagnetic heating coils are two electromagnetic heating coils, drive the two electromagnetic heating coils to work alternately; when there is one pot body and the target electromagnetic heating coils are three electromagnetic heating coils, determine the first electromagnetic heating coil located in the middle of the three electromagnetic heating coils, and the remaining electromagnetic heating coils except the first electromagnetic heating coil, and drive the first electromagnetic heating coil and the remaining electromagnetic heating coils to work alternately; when there are multiple pot bodies and the target electromagnetic heating coils are multiple electromagnetic heating coils, and each pot body corresponds to one or more electromagnetic heating coils, measure the temperature of the multiple pot bodies according to the number of electromagnetic heating coils corresponding to each of the pot bodies.

[0248] In this embodiment, when there is only one pot body and the target electromagnetic heating coil is one electromagnetic heating coil, only one electromagnetic heating coil works and there is no mutual interference. Therefore, the target electromagnetic heating coil can be directly driven to work to realize the detection of operating parameters.

[0249] When there are two target electromagnetic heating coils, the two electromagnetic heating coils are controlled to operate alternately to reduce mutual interference, thereby improving the accuracy of detection of operating parameters.

[0250] When there are three target electromagnetic heating coils, the first electromagnetic heating coil located in the middle and the remaining electromagnetic heating coils are determined so as to control the first electromagnetic heating coil and the remaining electromagnetic heating coils to work alternately, thereby eliminating interference.

[0251] In the case of multiple pots, the number of electromagnetic heating coils corresponding to each pot is determined, and then the scene of multiple pots is divided into multiple single pot temperature measurement scenes, so as to reduce and improve the temperature measurement efficiency.

[0252] In some embodiments, optionally, the temperature of multiple pots is measured simultaneously.

[0253] In one embodiment, if Fig.12 As shown, a temperature measuring device 1200 for a cooking device is provided, including a processor 1202 and a memory 1204, wherein the memory 1204 stores programs or instructions that can be run on the processor 1202, and when the programs or instructions are executed by the processor 1202, the steps of any of the above methods are implemented.

[0254] In one embodiment, a readable storage medium is provided, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of any of the above methods are implemented.

[0255] In one embodiment, the present invention provides a cooking device, comprising: a temperature measuring device 100 as any one of the above items.

[0256] In some embodiments, optionally, the cooking device comprises an induction cooktop.

[0257] The term "first" or "second" in the specification and claims of the present application may include one or more of the features explicitly or implicitly. In the textual description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0258] In the claims, specification and drawings of the present invention, the term "multiple" refers to two or more than two. Unless otherwise clearly defined, the orientation or position relationship indicated by the terms "upper" and "lower" is based on the orientation or position relationship shown in the drawings, which is only for the purpose of more conveniently describing the present invention and making the description process simpler, rather than indicating or implying that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation, so these descriptions cannot be understood as limiting the present invention; the terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood based on the specific circumstances of the above data.

[0259] In the claims, specification and drawings of the present invention, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0260] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A temperature measuring device, characterized in that: Used in a cooking device, the cooking device comprising: at least one electromagnetic heating coil, the at least one electromagnetic heating coil being used to couple with a pot body to heat the pot body, the temperature measuring device comprising: An acquisition circuit, used for acquiring operating parameters of a target electromagnetic heating coil; A control device is connected to the acquisition circuit, and is used to determine the magnetic permeability and electrical conductivity of the pot body according to the operating parameters; obtain a fitting relationship between the magnetic permeability, the electrical conductivity and the temperature value of the pot body; determine a target temperature value corresponding to the magnetic permeability and the electrical conductivity according to the fitting relationship; and output the target temperature value.

2. The temperature measuring device according to claim 1, characterized in that: The operating parameters include: a voltage signal acting on the target electromagnetic heating coil, a voltage waveform signal and a current waveform signal on the target electromagnetic heating coil, and the control device is specifically used for: Determine the first harmonic sine and cosine components corresponding to the voltage waveform signal as the first component; Determine the first harmonic sine and cosine components corresponding to the current waveform signal as the second component; determining a difference between the voltage signal and the first component; The ratio of the second component to the difference is used to represent the magnetic permeability and the electrical conductivity.

3. The temperature measuring device according to claim 2, characterized in that: The acquisition circuit includes a first acquisition circuit, and the first acquisition circuit includes: a first subtraction circuit, wherein an inverting input terminal and a non-inverting input terminal of the first subtraction circuit are respectively connected to two ends of the target electromagnetic heating coil; The first feedback resistor is located between the inverting input terminal of the first subtraction circuit and the output terminal of the first subtraction circuit, and the output terminal of the first subtraction circuit is used to output the voltage signal.

4. The temperature measuring device according to claim 3, characterized in that: The first acquisition circuit further includes: a first diode, wherein an anode of the first diode is connected to an inverting input terminal of the first subtraction circuit, and a cathode of the first diode is connected to a first power supply; and / or A second diode, wherein an anode of the second diode is connected to the non-inverting input terminal of the first subtraction circuit, and a cathode of the second diode is connected to the first power supply.

5. The temperature measuring device according to claim 3, characterized in that: The first acquisition circuit further includes: a first resistor, wherein a first end of the first resistor is connected to the inverting input end of the first subtraction circuit, and a second end of the first resistor is grounded; and / or A second resistor, wherein a first end of the second resistor is connected to the non-inverting input end of the first subtraction circuit, and a second end of the second resistor is grounded.

6. The temperature measuring device according to claim 3, characterized in that: The first acquisition circuit further includes: a first bias amplifier circuit, wherein a negative phase input terminal of the first bias amplifier circuit is connected to an output terminal of the first subtraction circuit, a positive phase input terminal of the first bias amplifier circuit is connected to a first power supply, and an output terminal of the first bias amplifier circuit is used to output the biased voltage signal; The second feedback resistor is located between the inverting input terminal of the first bias amplifier circuit and the output terminal of the first bias amplifier circuit.

7. The temperature measuring device according to claim 6, characterized in that: The first acquisition circuit further includes: The first current limiting resistor is located between the output terminal of the first subtraction circuit and the negative phase input terminal of the first bias amplifier circuit.

8. The temperature measuring device according to claim 6, characterized in that: The first acquisition circuit further includes: A first voltage-dividing resistor, located between the first power supply and a non-inverting input terminal of the first bias amplifier circuit; A second voltage-dividing resistor, wherein a first end of the second voltage-dividing resistor is connected to the non-inverting input end of the first bias amplifier circuit, and a second end of the second voltage-dividing resistor is grounded.

9. The temperature measuring device according to claim 6, characterized in that: The first acquisition circuit further includes: A first capacitor is connected in parallel with the second feedback resistor.

10. The temperature measuring device according to any one of claims 3 to 9, characterized in that: Also includes: The first selection circuit is connected to the at least one electromagnetic heating coil and the first acquisition circuit, and is used to select the target electromagnetic heating coil.

11. The temperature measuring device according to claim 3, characterized in that: The acquisition circuit includes a second acquisition circuit, and the second acquisition circuit includes: A first current transformer is located in the excitation loop where the at least one electromagnetic heating coil is located; a second subtraction circuit, wherein a positive phase input terminal and an inverting phase input terminal of the second subtraction circuit are connected to a first output terminal and a second output terminal of the first current transformer, and an output terminal of the second subtraction circuit is used to output the voltage waveform signal; The third feedback resistor is located between the non-inverting input terminal of the second subtraction circuit and the output terminal of the second subtraction circuit.

12. The temperature measuring device according to claim 11, characterized in that: The second acquisition circuit further includes: a third voltage-dividing resistor, wherein a first end of the third voltage-dividing resistor is connected to the non-inverting input end of the second subtraction circuit, and a second end of the third voltage-dividing resistor is connected to the first power supply; and / or A fourth voltage-dividing resistor, wherein a first end of the fourth voltage-dividing resistor is connected to the negative phase input end of the second subtraction circuit, and a second end of the fourth voltage-dividing resistor is grounded.

13. The temperature measuring device according to claim 11, characterized in that: The second acquisition circuit further includes: A third diode, wherein an anode of the third diode is connected to the non-inverting input terminal of the second subtraction circuit, and a cathode of the third diode is connected to the first power supply.

14. The temperature measuring device according to any one of claims 11 to 13, characterized in that: The acquisition circuit also includes: a third subtraction circuit, wherein an inverting input terminal of the third subtraction circuit is connected to an output terminal of the second subtraction circuit, a non-inverting input terminal of the third subtraction circuit is connected to an output terminal of the first subtraction circuit, and an output terminal of the third subtraction circuit is used to output a difference between the voltage signal and the first component; The fourth feedback resistor is located between the non-inverting input terminal of the third subtraction circuit and the output terminal of the third subtraction circuit.

15. The temperature measuring device according to claim 14, characterized in that: The third subtraction circuit further includes: The second current limiting resistor is located between the inverting input terminal of the third subtraction circuit and the output terminal of the second subtraction circuit.

16. The temperature measuring device according to claim 14, characterized in that: The third subtraction circuit further includes: a fifth voltage-dividing resistor, located between the output terminal of the first subtraction circuit and the non-inverting input terminal of the third subtraction circuit; A sixth voltage-dividing resistor, wherein a first end of the sixth voltage-dividing resistor is connected to the non-inverting input end of the third subtraction circuit, and a second end of the sixth voltage-dividing resistor is grounded.

17. The temperature measuring device according to any one of claims 11 to 13, characterized in that: Also includes: The second selection circuit is provided in the excitation circuit where the at least one electromagnetic heating coil is located, and is used to select the excitation circuit where the target electromagnetic heating coil is located.

18. The temperature measuring device according to claim 2, characterized in that: The acquisition circuit includes a third acquisition circuit, and the third acquisition circuit includes: A second current transformer is located in the excitation loop where the at least one electromagnetic heating coil is located; A connecting resistor, located between the first output terminal and the second output terminal of the second current transformer, one end of the connecting resistor being grounded; A fourth subtraction circuit, wherein the positive phase input terminal of the fourth subtraction circuit is connected to the other end of the connection resistor, the negative phase input terminal of the fourth subtraction circuit is connected to the output terminal of the fourth subtraction circuit, and the output terminal of the fourth subtraction circuit is used to output the current waveform signal.

19. The temperature measuring device according to claim 18, characterized in that: The third acquisition circuit further includes: a second bias amplifier circuit, wherein a negative phase input terminal of the second bias amplifier circuit is connected to an output terminal of the fourth subtraction circuit, a positive phase input terminal of the second bias amplifier circuit is connected to a first power supply, and an output terminal of the second bias amplifier circuit is used to output the biased current waveform signal; The fifth feedback resistor is located between the inverting input terminal of the second bias amplifier circuit and the output terminal of the second bias amplifier circuit.

20. The temperature measuring device according to claim 19, characterized in that: The third acquisition circuit further includes: The third current limiting resistor is located between the inverting input terminal of the fourth subtraction circuit and the negative input terminal of the second bias amplifier circuit.

21. The temperature measuring device according to claim 19, characterized in that: The third acquisition circuit further includes: a seventh voltage-dividing resistor, located between the first power supply and the non-inverting input terminal of the second bias amplifier circuit; An eighth voltage-dividing resistor, wherein a first end of the eighth voltage-dividing resistor is connected to the non-inverting input end of the second bias amplifier circuit, and a second end of the eighth voltage-dividing resistor is grounded.

22. The temperature measuring device according to claim 19, characterized in that: The third acquisition circuit further includes: The second capacitor is connected in parallel with the fifth feedback resistor.

23. The temperature measuring device according to any one of claims 18 to 22, characterized in that: The third acquisition circuit further includes: The third selection circuit is provided in the excitation circuit where the at least one electromagnetic heating coil is located, and is used to select the excitation circuit where the target electromagnetic heating coil is located.

24. A method for measuring temperature of a cooking device, characterized in that: The cooking device comprises: at least one electromagnetic heating coil, the at least one electromagnetic heating coil is used to couple with a pot body to heat the pot body, and the temperature measurement method comprises: Obtaining operating parameters of the target electromagnetic heating coil; determining the magnetic permeability and electrical conductivity of the pot body according to the operating parameters; Obtaining a fitting relationship among the magnetic permeability, the electrical conductivity and the temperature value of the pot body; Determine a target temperature value corresponding to the magnetic permeability and the electrical conductivity according to the fitting relationship; and output the target temperature value.

25. The temperature measurement method of cooking equipment according to claim 24, characterized in that: The operating parameters include: a voltage signal acting on a target electromagnetic heating coil, a voltage waveform signal and a current waveform signal on the target electromagnetic heating coil, and determining the magnetic permeability and electrical conductivity of the pot body according to the operating parameters specifically includes: Determine the first harmonic sine and cosine components corresponding to the voltage waveform signal as the first component; Determine the first harmonic sine and cosine components corresponding to the current waveform signal as the second component; determining a difference between the voltage signal and the first component; The ratio of the second component to the difference is used to represent the magnetic permeability and the electrical conductivity.

26. The temperature measurement method of a cooking device according to claim 24 or 25, characterized in that: Before obtaining the operating parameters of the target electromagnetic heating coil, the method further includes: When the number of the pot body is one and the target electromagnetic heating coil is one electromagnetic heating coil, driving the target electromagnetic heating coil to operate; When the number of the pot body is one and the target electromagnetic heating coils are two electromagnetic heating coils, driving the two electromagnetic heating coils to work alternately; When the number of the pot body is one and the target electromagnetic heating coils are three electromagnetic heating coils, a first electromagnetic heating coil located in the middle of the three electromagnetic heating coils and the remaining electromagnetic heating coils except the first electromagnetic heating coil are determined, and the first electromagnetic heating coil and the remaining electromagnetic heating coils are driven to work alternately; When there are multiple pot bodies, the target electromagnetic heating coils are multiple electromagnetic heating coils, and each pot body corresponds to one or more electromagnetic heating coils, the temperature of the multiple pot bodies is measured according to the number of electromagnetic heating coils corresponding to each pot body.

27. A temperature measuring device for cooking equipment, characterized in that: The cooking device comprises: at least one electromagnetic heating coil, the at least one electromagnetic heating coil is used to couple with a pot body to heat the pot body, and the temperature measuring device comprises: A first acquisition unit, used to acquire operating parameters of a target electromagnetic heating coil; a determination unit, configured to determine the magnetic permeability and electrical conductivity of the pot body according to the operating parameters; A second acquisition unit is used to acquire a fitting relationship between the magnetic permeability, the electrical conductivity and the temperature value of the pot body; A processing unit, configured to determine a target temperature value corresponding to the magnetic permeability and the electrical conductivity according to the fitting relationship; An output unit is used to output the target temperature value.

28. A temperature measuring device for cooking equipment, characterized in that: The method comprises a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method according to any one of claims 24 to 26 are implemented.

29. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by a processor, the steps of the method according to any one of claims 24 to 26 are implemented.

30. A cooking device, characterized in that: include: The temperature measuring device according to any one of claims 1 to 23; and / or The temperature measuring device of the cooking device according to claim 27 or 28; and / or The readable storage medium of claim 29.

31. The cooking device according to claim 30, characterized in that The cooking device comprises an induction cooker.

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