CN106402955A - Pan judgment method of electromagnetic cooking device and electromagnetic cooking device - Google Patents

Abstract

The present invention provides a method for judging a pot of an electromagnetic cooking device and the electromagnetic cooking device, wherein the method for judging a pot of the electromagnetic cooking device includes: applying an electric load signal with a specified duty ratio to the collector Within a specified time after, obtain the sampling signal of the collector; judge whether there is a zero-crossing conduction signal according to the sampling signal; when determining that the zero-crossing conduction signal occurs, determine the zero-crossing conduction signal duration; determining the zero-crossing conduction time of the preset cookware type corresponding to the duration, so as to complete the determination process of the cookware. Through the technical solution of the present invention, the electromagnetic cooking device is matched with various cooking utensils, and at the same time, the cooking utensils are heated in an optimal working mode, which improves cooking efficiency, reduces power consumption, and improves user experience.

Description

Method for judging pots of electromagnetic cooking device and electromagnetic cooking device

technical field

The present invention relates to the technical field of household appliances, and more specifically, to a method for judging a pot of an electromagnetic cooking device and an electromagnetic cooking device.

Background technique

In the related art, on the existing electromagnetic cooking device, for example, the driving scheme of the IGBT (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor) of the induction cooker is solidified in the program of the controller, and the type of the pot is determined through the pot judgment program , when the induction cooker is turned on for work, the driving scheme in the program is found by looking up the table to control the induction cooker for heating. For pots that are commonly used and whose parameters have not changed, they can usually better match the working time under the corresponding power, but for pots that are not frequently used, the material parameters of the pot have a large deviation from the material parameters of general pots, and it is difficult to pass The driving scheme in the program is obtained by looking up the table, which leads to the poor compatibility of the cookware, resulting in a relatively large output power deviation and poor product reliability.

Therefore, how to determine the zero-crossing conduction time of the IGBT and then determine the heating modes of different pots has become a technical problem to be solved urgently.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art.

Therefore, an object of the present invention is to propose a new method for judging pots of an electromagnetic cooking device.

Another object of the present invention is to provide an electromagnetic cooking device.

In order to achieve the above object, according to the embodiment of the first aspect of the present invention, a pot judging method of an electromagnetic cooking device is proposed, the electromagnetic cooking device includes a thyristor switch, and the thyristor switch includes an emitter, a collector and the base, the method for judging the pot includes: within a specified time after applying an electric load signal with a specified duty ratio to the collector, acquiring a sampling signal of the collector; judging whether there is The zero-crossing conduction signal appears; when it is determined that the zero-crossing conduction signal occurs, determine the duration of the zero-crossing conduction signal; determine the zero-crossing conduction time of the preset pot type corresponding to the duration , to complete the judging process of the pot.

According to the pot judging method of the electromagnetic cooking device in the embodiment of the present invention, the zero-crossing conduction time is determined through the sampling signal of the collector, so that the accurate judgment of the zero-crossing conduction time is realized, and at the same time, it is determined that the zero-crossing conduction time can be triggered. The load signal is passed, thereby improving the reliability of the IGBT, making it work in the zero-crossing conduction state as much as possible, thereby saving power consumption and improving reliability, that is, the pot is determined according to the zero-crossing conduction time different types, thereby improving the matching heating process for various pots.

Specifically, for an electromagnetic cooking device such as an induction cooker, the length of time the thyristor switch is turned on determines the energy intensity of the LC (coil plate and resonant capacitor) circuit, and the energy intensity determines the amplitude of the LC oscillation, which in turn can predict the V _CE (collector and the voltage between the emitter and the voltage variation range, when the thyristor LC (coil plate and resonant capacitor) naturally oscillates after the thyristor is turned off, the V _CE (the voltage between the collector and the emitter) voltage of the thyristor follows the fluctuation, wherein, V The amplitude of _CE is large, and the sampling signal of the collector is positively correlated with V _CE . Therefore, the sampling signal of the collector is used as the basis for judging the zero-crossing conduction, which reduces the detection range and improves the reliability of the detection process.

Among them, by obtaining the sampling signal of the collector of the thyristor switch, and inputting the obtained sampling signal into the AD conversion module (digital-to-analog conversion module) of the single-chip microcomputer, or first passing the AD conversion chip and then inputting the obtained signal to the single-chip microcomputer, the simulation is realized. The conversion between signal and digital signal, and the obtained digital signal is directly assigned to the program, so that the single-chip microcomputer can quickly judge whether there is a zero-crossing conduction point, that is, the electrical signal at the trigger point changes from zero or negative to positive. value, the single-chip microcomputer recognizes the zero-crossing conduction point, and compares the self-resonant voltage after shutdown with the set reference voltage, so that the single-chip microcomputer can judge and automatically find the optimal zero-crossing conduction time of the thyristor switch .

In addition, the method for judging a pot of an electromagnetic cooking device according to the above-mentioned embodiments of the present invention also has the following additional technical features:

According to an embodiment of the present invention, preferably, within a specified time after applying an electrical load signal to the collector, acquiring the sampling signal of the collector includes the following specific steps: applying the electrical load signal to the collector After the load signal, within a specified time of stopping applying the electrical load signal, the signal of the collector is collected, and digital-to-analog conversion is performed on the signal of the collector, so as to obtain the sampling signal.

According to the cooker judging method of the electromagnetic cooking device according to the embodiment of the present invention, the detection range is reduced and the reliability of the detection process is improved by collecting the base signal within a specified time after the electric load signal stops supplying power to the base.

Specifically, when obtaining the sampling signal of the collector of the thyristor switch, and inputting the obtained sampling signal into the AD conversion module (digital-to-analog conversion module) carried by the single-chip microcomputer or first passing the AD conversion chip and then inputting the obtained signal to the single-chip microcomputer, the The obtained digital signal is directly assigned to the program, so that the single-chip microcomputer can judge that there is a zero-crossing conduction point, that is, the point when the triggered voltage changes from zero to a positive value, so that the zero-crossing conduction time can be determined.

According to an embodiment of the present invention, preferably, judging whether there is a zero-crossing conduction signal according to the sampling signal includes the following specific steps: judging whether the sampling signal is greater than or equal to a preset reference signal; When the signal is greater than or equal to the preset reference signal, it is determined that the zero-crossing conduction signal occurs.

According to the method for judging a cooker of an electromagnetic cooking device according to an embodiment of the present invention, by judging whether the sampling signal is greater than or equal to a preset reference signal, it is determined that the zero-crossing conduction signal occurs, so that it can quickly judge and automatically find the optimum value of the thyristor switch. Excellent zero-crossing conduction time, and then adjust the drive synchronization scheme according to the zero-crossing conduction time, that is, realize the matching process of the electromagnetic cooking device and the heating mode of different pots, and reduce power consumption.

According to an embodiment of the present invention, preferably, judging whether the sampled signal is greater than or equal to a preset reference signal includes the following specific steps: when determining that the sampled signal is smaller than the preset reference signal, determining that there is no Zero conduction signal occurs.

According to the pot judging method of the electromagnetic cooking device according to the embodiment of the present invention, it is determined that no zero-crossing conduction signal occurs when it is determined that the sampling signal is smaller than the preset reference signal, which further ensures the determination of the zero-crossing conduction time. reliability and accuracy, and at the same time, it is convenient to improve the efficiency of detecting the zero-crossing conduction signal.

According to an embodiment of the present invention, preferably, the following specific steps are further included: when it is determined that the trigger signal is not generated, increasing the duty ratio of the electrical load signal, and using the electrical load signal with the increased duty ratio as the Describes an electrical load signal with a specified duty cycle.

According to the pot judging method of the electromagnetic cooking device according to the embodiment of the present invention, when the trigger signal is not detected, the duty cycle of the electrical load signal is increased, that is, the power applied to the IGBT is increased, thereby speeding up the determination of zero crossing The efficiency of the conduction time, wherein, the increase of the duty cycle can be tested according to a preset step value, or according to a preset power curve, until a trigger signal is generated.

According to the embodiment of the second aspect of the present invention, an electromagnetic cooking device is also proposed, including a thyristor switch, the thyristor switch includes an emitter, a collector and a base, and the electromagnetic cooking device also includes: an acquisition unit for Obtain a sampling signal of the collector within a specified time after applying an electrical load signal with a specified duty ratio to the collector; a judging unit is used to judge whether there is a zero-crossing conduction signal according to the sampling signal; The determining unit is configured to determine the duration of the zero-crossing conduction signal when it is determined that the zero-crossing conduction signal occurs; the determination unit is also used to determine the preset pot type corresponding to the duration The zero-crossing conduction time is used to complete the determination process of the cooker.

According to the electromagnetic cooking device of the embodiment of the present invention, the zero-crossing conduction time is determined through the sampling signal of the collector, which realizes the accurate judgment of the zero-crossing conduction time, and at the same time determines the load signal that can trigger the zero-crossing conduction, Thereby improving the reliability of the IGBT, making it work in the zero-crossing conduction state as much as possible, thereby saving power consumption and improving reliability, that is, the type of the pot is determined according to the zero-crossing conduction time, thereby improving Matching heating process to various pots and pans.

Specifically, for an electromagnetic cooking device such as an induction cooker, the length of time that the front thyristor switch is turned on determines the energy intensity of the LC (coil disk and resonant capacitor) circuit, and the energy intensity determines the amplitude of the LC oscillation, and then the V _CE (collection The voltage change range of the voltage between the electrode and the emitter), and the V _CE (the voltage between the collector and the emitter) voltage of the thyristor follows the fluctuation when the thyristor LC (coil plate and resonant capacitor) oscillates naturally after being turned off, wherein, The amplitude of V _CE is large, and the sampling signal of the collector is positively correlated with V _CE . Therefore, the sampling signal of the collector is used as the basis for judging zero-crossing conduction, which reduces the detection range and improves the reliability of the detection process.

Among them, by obtaining the sampling signal of the collector of the thyristor switch, and inputting the obtained sampling signal into the AD conversion module (digital-to-analog conversion module) of the single-chip microcomputer, or first passing the AD conversion chip and then inputting the obtained signal to the single-chip microcomputer, the simulation is realized. The conversion between signal and digital signal, and the obtained digital signal is directly assigned to the program, so that the single-chip microcomputer can quickly judge whether there is a zero-crossing conduction point, that is, the electrical signal at the trigger point changes from zero or negative to positive. value, the single-chip microcomputer recognizes the zero-crossing conduction point, and compares the self-resonant voltage after shutdown with the set reference voltage, so that the single-chip microcomputer can judge and automatically find the optimal zero-crossing conduction time of the thyristor switch .

According to an embodiment of the present invention, preferably, the acquisition unit further includes: an acquisition unit, configured to collect the electrical load signal within a specified time of stopping applying the electrical load signal after the electrical load signal is applied to the collector The signal of the collector is digital-to-analog conversion processed on the signal of the collector to obtain the sampling signal.

According to the electromagnetic cooking device of the embodiment of the present invention, the detection range is reduced and the reliability of the detection process is improved by collecting the base signal within a specified time after the electric load signal stops supplying power to the base.

Specifically, when obtaining the sampling signal of the collector of the thyristor switch, and inputting the obtained sampling signal into the AD conversion module (digital-to-analog conversion module) carried by the single-chip microcomputer or first passing the AD conversion chip and then inputting the obtained signal to the single-chip microcomputer, the The obtained digital signal is directly assigned to the program, so that the single-chip microcomputer can judge that there is a zero-crossing conduction point, that is, the point when the triggered voltage changes from zero to a positive value, so that the zero-crossing conduction time can be determined.

According to an embodiment of the present invention, preferably, the judging unit is further configured to judge whether the sampled signal is greater than or equal to a preset reference signal; the determining unit is also configured to determine whether the sampled signal is greater than or equal to When the preset reference signal is used, it is determined that the zero-crossing conduction signal appears.

According to the electromagnetic cooking device of the embodiment of the present invention, by judging whether the sampling signal is greater than or equal to the preset reference signal to determine the occurrence of the zero-crossing conduction signal, it is possible to quickly judge and automatically find the optimal zero-crossing conduction of the thyristor switch. On-time, and then adjust the driving synchronization scheme according to the zero-crossing on-time, that is, realize the matching process of the electromagnetic cooking device and the heating mode of different pots, and reduce power consumption.

According to an embodiment of the present invention, preferably, the determining unit is further configured to, when determining that the sampled signal is smaller than the preset reference signal, determine that no zero-crossing conduction signal occurs.

According to the electromagnetic cooking device of the embodiment of the present invention, by setting that when the sampling signal is determined to be smaller than the preset reference signal, it is determined that there is no zero-crossing conduction signal, which further ensures the reliability and accuracy of determining the zero-crossing conduction time , and at the same time, it is convenient to improve the efficiency of detecting the zero-crossing conduction signal.

According to an embodiment of the present invention, preferably, further comprising: an increasing unit, configured to increase the duty cycle of the electrical load signal when it is determined that the trigger signal is not generated, and increase the duty cycle of the electrical load signal as the electrical load signal of the specified duty cycle.

According to the electromagnetic cooking device of the embodiment of the present invention, when the trigger signal is not detected, the duty cycle of the electrical load signal is increased, that is, the power applied to the IGBT is increased, thereby speeding up the efficiency of determining the zero-crossing conduction time , wherein the increase of the duty cycle may be performed according to a preset step value or a preset power curve until a trigger signal is generated.

According to the electromagnetic cooking device of the present invention, it can also be an electromagnetic heating rice cooker or an electromagnetic heating pressure cooker.

Additional aspects and advantages in accordance with the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

FIG. 1 shows a schematic flowchart of a method for judging a pan of an electromagnetic cooking device according to an embodiment of the present invention;

Fig. 2 shows a schematic block diagram of an electromagnetic cooking device according to an embodiment of the present invention;

Fig. 3 shows a schematic flowchart of a control method of an electromagnetic cooking device according to an embodiment of the present invention;

Fig. 4 shows the real-time test diagram of electromagnetic cooking control according to one embodiment of the present invention;

Fig. 5 shows a real-time test chart of electromagnetic cooking control according to another embodiment of the present invention.

detailed description

In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways than described here. Therefore, the protection scope of the present invention is not limited by the specific implementation disclosed below. Example limitations.

Fig. 1 shows a schematic flowchart of a method for judging a pot of an electromagnetic cooking device according to an embodiment of the present invention.

As shown in Figure 1, according to the method for judging a pot of an electromagnetic cooking device according to an embodiment of the present invention, the electromagnetic cooking device includes a thyristor switch, the thyristor switch includes an emitter, a collector and a base, and the pot The judging method includes: step 102, acquiring a sampling signal of the collector within a specified time after applying an electric load signal with a specified duty ratio to the collector; step 104, judging whether there is a zero-crossing according to the sampling signal The conduction signal appears; Step 106, when determining that the zero-crossing conduction signal occurs, determine the duration of the zero-crossing conduction signal; Step 108, determine the duration of the preset pot type corresponding to the duration Zero on-time to complete the pot determination process.

According to the pot judging method of the electromagnetic cooking device in the embodiment of the present invention, the zero-crossing conduction time is determined through the sampling signal of the collector, so that the accurate judgment of the zero-crossing conduction time is realized, and at the same time, it is determined that the zero-crossing conduction time can be triggered. The load signal is passed, thereby improving the reliability of the IGBT, making it work in the zero-crossing conduction state as much as possible, thereby saving power consumption and improving reliability, that is, the pot is determined according to the zero-crossing conduction time different types, thereby improving the matching heating process for various pots.

Specifically, for an electromagnetic cooking device such as an induction cooker, the length of time the thyristor switch is turned on determines the energy intensity of the LC (coil plate and resonant capacitor) circuit, and the energy intensity determines the amplitude of the LC oscillation, which in turn can predict the V _CE (collector and the voltage between the emitter and the voltage variation range, when the thyristor LC (coil plate and resonant capacitor) naturally oscillates after the thyristor is turned off, the V _CE (the voltage between the collector and the emitter) voltage of the thyristor follows the fluctuation, wherein, V The amplitude of _CE is large, and the sampling signal of the collector is positively correlated with V _CE . Therefore, the sampling signal of the collector is used as the basis for judging the zero-crossing conduction, which reduces the detection range and improves the reliability of the detection process.

Among them, by obtaining the sampling signal of the collector of the thyristor switch, and inputting the obtained sampling signal into the AD conversion module (digital-to-analog conversion module) of the single-chip microcomputer, or first passing the AD conversion chip and then inputting the obtained signal to the single-chip microcomputer, the simulation is realized. The conversion between signal and digital signal, and the obtained digital signal is directly assigned to the program, so that the single-chip microcomputer can quickly judge whether there is a zero-crossing conduction point, that is, the electrical signal at the trigger point changes from zero or negative to positive. value, the single-chip microcomputer recognizes the zero-crossing conduction point, and compares the self-resonant voltage after shutdown with the set reference voltage, so that the single-chip microcomputer can judge and automatically find the optimal zero-crossing conduction time of the thyristor switch .

In addition, the method for judging a pot of an electromagnetic cooking device according to the above-mentioned embodiments of the present invention also has the following additional technical features:

According to an embodiment of the present invention, preferably, within a specified time after applying an electrical load signal to the collector, acquiring the sampling signal of the collector includes the following specific steps: applying the electrical load signal to the collector After the load signal, within a specified time of stopping applying the electrical load signal, the signal of the collector is collected, and digital-to-analog conversion is performed on the signal of the collector, so as to obtain the sampling signal.

According to the cooker judging method of the electromagnetic cooking device according to the embodiment of the present invention, the detection range is reduced and the reliability of the detection process is improved by collecting the base signal within a specified time after the electric load signal stops supplying power to the base.

Specifically, when obtaining the sampling signal of the collector of the thyristor switch, and inputting the obtained sampling signal into the AD conversion module (digital-to-analog conversion module) carried by the single-chip microcomputer or first passing the AD conversion chip and then inputting the obtained signal to the single-chip microcomputer, the The obtained digital signal is directly assigned to the program, so that the single-chip microcomputer can judge that there is a zero-crossing conduction point, that is, the point when the triggered voltage changes from zero to a positive value, so that the zero-crossing conduction time can be determined.

According to an embodiment of the present invention, preferably, judging whether there is a zero-crossing conduction signal according to the sampling signal includes the following specific steps: judging whether the sampling signal is greater than or equal to a preset reference signal; When the signal is greater than or equal to the preset reference signal, it is determined that the zero-crossing conduction signal occurs.

According to the method for judging a cooker of an electromagnetic cooking device according to an embodiment of the present invention, by judging whether the sampling signal is greater than or equal to a preset reference signal, it is determined that the zero-crossing conduction signal occurs, so that it can quickly judge and automatically find the optimum value of the thyristor switch. Excellent zero-crossing conduction time, and then adjust the drive synchronization scheme according to the zero-crossing conduction time, that is, realize the matching process of the electromagnetic cooking device and the heating mode of different pots, and reduce power consumption.

According to an embodiment of the present invention, preferably, judging whether the sampled signal is greater than or equal to a preset reference signal includes the following specific steps: when determining that the sampled signal is smaller than the preset reference signal, determining that there is no Zero conduction signal occurs.

According to the pot judging method of the electromagnetic cooking device according to the embodiment of the present invention, it is determined that no zero-crossing conduction signal occurs when it is determined that the sampling signal is smaller than the preset reference signal, which further ensures the determination of the zero-crossing conduction time. reliability and accuracy, and at the same time, it is convenient to improve the efficiency of detecting the zero-crossing conduction signal.

According to an embodiment of the present invention, preferably, the following specific steps are further included: when it is determined that the trigger signal is not generated, increasing the duty ratio of the electrical load signal, and using the electrical load signal with the increased duty ratio as the Describes an electrical load signal with a specified duty cycle.

According to the pot judging method of the electromagnetic cooking device according to the embodiment of the present invention, when the trigger signal is not detected, the duty cycle of the electrical load signal is increased, that is, the power applied to the IGBT is increased, thereby speeding up the determination of zero crossing The efficiency of the conduction time, wherein, the increase of the duty cycle can be tested according to a preset step value, or according to a preset power curve, until a trigger signal is generated.

Fig. 2 shows a schematic block diagram of an electromagnetic cooking device according to an embodiment of the present invention.

As shown in Figure 2, the electromagnetic cooking device 200 according to the embodiment of the present invention includes a thyristor switch, the thyristor switch includes an emitter, a collector and a base, and the electromagnetic cooking device also includes: an acquisition unit 202 for Obtain a sampling signal of the collector within a specified time after applying an electrical load signal with a specified duty ratio to the collector; the judging unit 204 is used to judge whether there is a zero-crossing conduction signal according to the sampling signal; The determining unit 206 is configured to determine the duration of the zero-crossing conduction signal when it is determined that the zero-crossing conduction signal occurs; the determination unit 206 is also used to determine a preset pot corresponding to the duration The zero-crossing conduction time of the type of cooker is used to complete the determination process of the cooker.

According to the electromagnetic cooking device of the embodiment of the present invention, the zero-crossing conduction time is determined through the sampling signal of the collector, which realizes the accurate judgment of the zero-crossing conduction time, and at the same time determines the load signal that can trigger the zero-crossing conduction, Thereby improving the reliability of the IGBT, making it work in the zero-crossing conduction state as much as possible, thereby saving power consumption and improving reliability, that is, the type of the pot is determined according to the zero-crossing conduction time, thereby improving Matching heating process to various pots and pans.

Specifically, for an electromagnetic cooking device such as an induction cooker, the length of time the thyristor switch is turned on determines the energy intensity of the LC (coil plate and resonant capacitor) circuit, and the energy intensity determines the amplitude of the LC oscillation, which in turn can predict the V _CE (collector and the voltage between the emitter and the voltage variation range, when the thyristor LC (coil plate and resonant capacitor) naturally oscillates after the thyristor is turned off, the V _CE (the voltage between the collector and the emitter) voltage of the thyristor follows the fluctuation, wherein, V The amplitude of _CE is large, and the sampling signal of the collector is positively correlated with V _CE . Therefore, the sampling signal of the collector is used as the basis for judging the zero-crossing conduction, which reduces the detection range and improves the reliability of the detection process.

Among them, by obtaining the sampling signal of the collector of the thyristor switch, and inputting the obtained sampling signal into the AD conversion module (digital-to-analog conversion module) of the single-chip microcomputer, or first passing the AD conversion chip and then inputting the obtained signal to the single-chip microcomputer, the simulation is realized. The conversion between signal and digital signal, and the obtained digital signal is directly assigned to the program, so that the single-chip microcomputer can quickly judge whether there is a zero-crossing conduction point, that is, the electrical signal at the trigger point changes from zero or negative to positive. value, the single-chip microcomputer recognizes the zero-crossing conduction point, and compares the self-resonant voltage after shutdown with the set reference voltage, so that the single-chip microcomputer can judge and automatically find the optimal zero-crossing conduction time of the thyristor switch .

According to an embodiment of the present invention, preferably, the acquisition unit 202 further includes: an acquisition unit 2022, configured to stop applying the electrical load signal within a specified time after applying the electrical load signal to the collector , collect the signal of the collector, and perform digital-to-analog conversion processing on the signal of the collector to obtain the sampling signal.

According to the electromagnetic cooking device of the embodiment of the present invention, the detection range is reduced and the reliability of the detection process is improved by collecting the base signal within a specified time after the electric load signal stops supplying power to the base.

Specifically, when obtaining the sampling signal of the collector of the thyristor switch, and inputting the obtained sampling signal into the AD conversion module (digital-to-analog conversion module) carried by the single-chip microcomputer or first passing the AD conversion chip and then inputting the obtained signal to the single-chip microcomputer, the The obtained digital signal is directly assigned to the program, so that the single-chip microcomputer can judge that there is a zero-crossing conduction point, that is, the point when the triggered voltage changes from zero to a positive value, so that the zero-crossing conduction time can be determined.

According to an embodiment of the present invention, preferably, the judging unit 204 is further configured to judge whether the sampled signal is greater than or equal to a preset reference signal; the determining unit is also configured to determine whether the sampled signal is greater than or equal to When equal to the preset reference signal, it is determined that the zero-crossing conduction signal occurs.

According to the electromagnetic cooking device of the embodiment of the present invention, by judging whether the sampling signal is greater than or equal to the preset reference signal to determine the occurrence of the zero-crossing conduction signal, it is possible to quickly judge and automatically find the optimal zero-crossing conduction of the thyristor switch. On-time, and then adjust the driving synchronization scheme according to the zero-crossing on-time, that is, realize the matching process of the electromagnetic cooking device and the heating mode of different pots, and reduce power consumption.

According to an embodiment of the present invention, preferably, the determining unit 206 is further configured to, when determining that the sampled signal is smaller than the preset reference signal, determine that no zero-crossing conduction signal occurs.

According to the electromagnetic cooking device of the embodiment of the present invention, by setting that when the sampling signal is determined to be smaller than the preset reference signal, it is determined that there is no zero-crossing conduction signal, which further ensures the reliability and accuracy of determining the zero-crossing conduction time , and at the same time, it is convenient to improve the efficiency of detecting the zero-crossing conduction signal.

According to an embodiment of the present invention, preferably, further comprising: an increasing unit 208, configured to increase the duty cycle of the electric load signal when it is determined that the trigger signal is not generated, and increase the duty cycle of the electric load signal The load signal is used as the electrical load signal of the specified duty cycle.

According to the electromagnetic cooking device of the embodiment of the present invention, when the trigger signal is not detected, the duty cycle of the electrical load signal is increased, that is, the power applied to the IGBT is increased, thereby speeding up the efficiency of determining the zero-crossing conduction time , wherein the increase of the duty cycle may be performed according to a preset step value or a preset power curve until a trigger signal is generated.

The electromagnetic cooking device 200 according to an embodiment of the present invention may be an electromagnetic cooker, an electromagnetic heating rice cooker or an electromagnetic heating pressure cooker, all of which can be used to determine the cookware.

Fig. 3 shows a schematic flowchart of a control method of an electromagnetic cooking device according to an embodiment of the present invention.

As shown in Figure 3, the control method of an electromagnetic cooking device according to an embodiment of the present invention includes: step 402, the pot judgment program; step 404, initial continuous heating (minimum PPG value); step 406, shut down after working for 5ms Make it self-oscillate (in power frequency voltage peak); Step 408, PPG prolongs certain value; Step 410, judge whether trigger signal is produced, if so, then execute step 412, if not (as shown in Figure 4), then execute step 408; Step 412, determine the IGBT zero-crossing conduction time under the best PPG; Step 414, match the zero-crossing conduction time with the pot type; Step 416, judge the type of any power command obtained; Step 418, Low power command control subroutine; step 420, high power command control subroutine; step 422, reference power control subroutine.

Specifically, in step 404, the electromagnetic cooking device is controlled to heat at a preset heating time, and the electromagnetic cooking device enters a self-resonance state after the heating is completed, that is, the above-mentioned self-oscillation state, and the self-resonance voltage starts to increase with the self-resonance time. Increase and decrease continuously, so that the time record is performed when the reference voltage is lower than the reference voltage, and the principle that the V _CE voltage of the IGBT follows the fluctuation when the LC (coil disk and resonant capacitor) self-oscillates after the magnetic furnace is shut down (the IGBT is relatively long-term off) to realise. The length of time that the IGBT is turned on before it is turned off determines the energy intensity of the LC circuit, and the energy intensity determines the amplitude of the LC oscillation, and the variation of V _CE can also be expected. When the turn-on time of the IGBT reaches a certain level before being turned off, and the voltage fluctuation of V _CE is the lowest to a certain level, the IGBT presents a zero-crossing conduction, and the trigger signal 1 shown in Figure 5 will also be generated, while the previous IGBTs are super-leading Of course, if it is lower, there will be a hysteresis conduction. Record the trigger signal 1 to the start time of the self-oscillation state to determine the reference heating time. If the self-resonant voltage of the IGBT decreases to zero, the trigger signal does not appear. 1, then the control increases the duty cycle of the PPG and tests whether there is a trigger signal 1 in real time. According to the electromagnetic heating control scheme of the present invention, it is to let the single-chip microcomputer identify the point of zero-crossing conduction, and record the time when the IGBT is turned on at this time. The time for the IGBT to turn on at zero conduction is different.

The technical solution of the present invention has been described in detail above in conjunction with the accompanying drawings. Considering the technical problem of how to determine the zero-crossing conduction time of the IGBT and then determine the heating modes of different pots, the present invention proposes a pot judgment method for an electromagnetic cooking device And an electromagnetic cooking device, such as an electromagnetic cooker, determines the zero-crossing conduction time through the sampling signal of the collector, realizes the accurate judgment of the zero-crossing conduction time, and determines the load signal that can trigger the zero-crossing conduction, thereby The reliability of the IGBT is improved, making it work in the zero-crossing conduction state as much as possible, thereby saving power consumption and improving reliability.

The above descriptions 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 changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A cooking utensil judging method of an electromagnetic cooking device, comprising a thyristor switch in the electromagnetic cooking device, the thyristor switch comprising an emitter, a collector and a base, it is characterized in that the judging method of the cooking utensils comprises: acquiring a sampling signal of the collector within a specified time after applying an electrical load signal with a specified duty ratio to the collector; judging whether a zero-crossing conduction signal occurs according to the sampling signal; When determining that the zero-crossing conduction signal occurs, determine the duration of the zero-crossing conduction signal; Determine the preset zero-crossing conduction time of the cookware type corresponding to the duration, so as to complete the determination process of the cookware. 2. The pot judging method of electromagnetic cooking device according to claim 1, characterized in that, within a specified time after the electric load signal is applied to the collector, the sampling signal of the collector is obtained, including the following specific step: After applying the electrical load signal to the collector, collect the signal of the collector within a specified time period when the application of the electrical load signal is stopped, and perform digital-to-analog conversion processing on the signal of the collector to obtain the the sampled signal. 3. The pot judging method of an electromagnetic cooking device according to claim 1, wherein judging whether a zero-crossing conduction signal occurs according to the sampling signal comprises the following specific steps: judging whether the sampling signal is greater than or equal to a preset reference signal; When it is determined that the sampling signal is greater than or equal to the preset reference signal, it is determined that the zero-crossing conduction signal occurs. 4. The pot judging method of an electromagnetic cooking device according to claim 3, wherein judging whether the sampling signal is greater than or equal to a preset reference signal comprises the following specific steps: When it is determined that the sampling signal is smaller than the preset reference signal, it is determined that no zero-crossing conduction signal occurs. 5. The pot judging method of the electromagnetic cooking device according to any one of claims 1 to 4, further comprising the following specific steps: When it is determined that the trigger signal is not generated, the duty ratio of the electrical load signal is increased, and the electrical load signal with the increased duty ratio is used as the electrical load signal with the specified duty ratio. 6. An electromagnetic cooking device, comprising a thyristor switch, said thyristor switch comprising an emitter, a collector and a base, characterized in that said electromagnetic cooking device also includes: an acquisition unit, configured to acquire a sampling signal of the collector within a specified time after an electrical load signal with a specified duty ratio is applied to the collector; a judging unit, configured to judge whether there is a zero-crossing conduction signal according to the sampling signal; A determining unit, configured to determine the duration of the zero-crossing conduction signal when it is determined that the zero-crossing conduction signal occurs; The determination unit is further configured to determine the zero-crossing conduction time of the preset cookware type corresponding to the duration, so as to complete the determination process of the cooker. 7. The electromagnetic cooking device according to claim 6, wherein the acquisition unit further comprises: The acquisition unit is used to collect the signal of the collector and perform digital-to-analog conversion on the signal of the collector within a specified time after the electrical load signal is applied to the collector. processed to obtain the sampled signal. 8. The electromagnetic cooking device according to claim 6, wherein the judging unit is further configured to judge whether the sampling signal is greater than or equal to a preset reference signal; The determination unit is further configured to determine that the zero-crossing conduction signal occurs when it is determined that the sampling signal is greater than or equal to the preset reference signal. 9. The electromagnetic cooking device according to claim 8, wherein the determining unit is further configured to, when determining that the sampling signal is smaller than the preset reference signal, determine that no zero-crossing conduction signal occurs . 10. The electromagnetic cooking device according to any one of claims 6 to 9, further comprising: The increasing unit is configured to increase the duty ratio of the electrical load signal when it is determined that the trigger signal is not generated, and use the electrical load signal with the increased duty ratio as the electrical load signal with the specified duty ratio.