CN112714514A - Electromagnetic heating equipment and heating control system and method thereof - Google Patents
Electromagnetic heating equipment and heating control system and method thereof Download PDFInfo
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- CN112714514A CN112714514A CN201911024410.9A CN201911024410A CN112714514A CN 112714514 A CN112714514 A CN 112714514A CN 201911024410 A CN201911024410 A CN 201911024410A CN 112714514 A CN112714514 A CN 112714514A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
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Abstract
The invention discloses an electromagnetic heating device and a heating control system and method thereof, wherein the system comprises: a resonant circuit; a drive circuit; a first controllable switch; a signal processing unit; and the control unit is used for outputting a first control signal to the driving circuit so that the driving circuit drives the resonant circuit when the measuring stage is determined to enter, outputting an excitation trigger signal to the driving circuit to provide self-excitation energy until a first condition is met, stopping outputting the first control signal when the excitation trigger signal is output, and controlling the first controllable switch to be switched on, so that the signal processing unit outputs a second control signal to the driving circuit so that the driving circuit drives the resonant circuit to perform self-excitation oscillation, acquiring a resonant parameter of the resonant circuit in the self-excitation oscillation process of the resonant circuit, and determining the temperature of the cookware according to the resonant parameter. Therefore, the pot temperature measuring device can realize accurate control of the pot temperature measuring stage, effectively reduce noise and improve the accuracy of temperature measurement.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a heating control system of electromagnetic heating equipment, the electromagnetic heating equipment, a heating control method of the electromagnetic heating equipment and a readable storage medium.
Background
In the related art, the temperature measurement of the induction cooker is indirectly realized by measuring the period of the resonance system. However, the related art has problems that the control method is not accurate enough, and measurement noise and measurement result deviation are large.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, a first object of the present invention is to provide a heating control system of an electromagnetic heating apparatus, so as to realize precise control of a temperature measurement stage, thereby effectively reducing noise and also improving accuracy of temperature measurement.
A second object of the invention is to propose an electromagnetic heating device.
A third object of the present invention is to provide a heating control method of an electromagnetic heating apparatus.
A fourth object of the invention is to propose a readable storage medium.
To achieve the above object, an embodiment of a first aspect of the present invention provides a heating control system of an electromagnetic heating apparatus, including: a resonant circuit; the driving circuit is connected with the resonance circuit and is used for driving the resonance circuit to perform resonance heating; a first controllable switch; the signal processing unit is connected with the driving circuit through the first controllable switch and is also connected with the resonant circuit to acquire resonant parameters of the resonant circuit; a control unit, connected to the first controllable switch, the driving circuit and the signal processing unit, for outputting a first control signal to the driving circuit to drive the resonant circuit when it is determined that the measurement stage is entered, and outputting an excitation trigger signal to the driving circuit to provide self-excited energy until a first condition is met, and stopping outputting the first control signal when the excitation trigger signal is output, and controlling the first controllable switch to be turned on, so that the signal processing unit outputs a second control signal to the driving circuit to drive the resonant circuit to perform self-excited oscillation, and for acquiring a resonant parameter of the resonant circuit during the self-excited oscillation of the resonant circuit, and determining the temperature of the cookware according to the resonance parameters.
According to the heating control system of the electromagnetic heating device, the resonant circuit is driven by the driving circuit to perform resonant heating, the signal processing unit is used for acquiring resonance parameters of the resonance circuit, and when the control unit determines to enter a measuring stage, outputting a first control signal to the drive circuit for the drive circuit to drive the resonant circuit until a first condition is met, outputting an excitation trigger signal to the drive circuit to provide self-excited energy, and when the excitation trigger signal is output, the first control signal is stopped to be output and the first controllable switch is controlled to be conducted, the signal processing unit outputs a second control signal to the driving circuit so that the driving circuit drives the resonant circuit to perform self-excitation oscillation, and the control unit also obtains the resonant parameters of the resonant circuit in the self-excitation oscillation process of the resonant circuit and determines the temperature of the cookware according to the resonant parameters. Therefore, the heating control system of the electromagnetic heating equipment provided by the embodiment of the invention can realize accurate control on the temperature measurement stage of the cookware, so that the noise can be effectively reduced, and the accuracy of temperature measurement can be improved.
According to an embodiment of the invention, the control unit is further adapted to determine that the first condition is fulfilled, if it is determined that the time to enter the measurement phase reaches a first time or that the voltage at the input of the resonant circuit reaches an excitation voltage.
According to one embodiment of the invention, the first control signal is a PWM signal, the excitation trigger signal is a pulse signal, and the pulse width of the pulse signal is greater than or equal to 1/2 of the turn-on width of the PWM signal.
According to an embodiment of the present invention, a duration of the signal processing unit outputting the second control signal to the driving circuit is greater than or equal to 100 us.
According to an embodiment of the invention, the control unit is further configured to obtain the resonance parameter of the resonance circuit multiple times, and determine the temperature of the pot according to the obtained resonance parameter multiple times.
According to one embodiment of the present invention, the resonant circuit includes a first resonant capacitor, a second resonant capacitor, a heating coil, a first switching tube and a second switching tube, one end of the first resonance capacitor is connected with the collector of the first switch tube and is used as the input end of the resonance circuit, one end of the second resonance capacitor is connected with the other end of the first resonance capacitor, and is connected with one end of the heating coil, the other end of the second resonance capacitor is grounded, the collector of the second switching tube is connected with the emitter of the first switching tube and is connected with the other end of the heating coil, the emitter of the second switching tube is grounded, wherein the driving circuit drives the resonant circuit to perform self-excited oscillation by controlling the second switching tube to be turned on or off, or the first switching tube is controlled to be switched on or switched off to drive the resonant circuit to carry out self-excitation oscillation.
According to an embodiment of the present invention, the heating control system of the electromagnetic heating apparatus further includes: a current transformer for detecting a current flowing through the heating coil; wherein the signal processing unit generates a detection signal according to the current flowing through the heating coil, and the control unit determines the resonance parameter of the resonance circuit according to the detection signal.
According to an embodiment of the present invention, the heating control system of the electromagnetic heating apparatus further includes: an excitation circuit connected to an input of the resonant circuit, the excitation circuit for outputting an excitation voltage to the input of the resonant circuit during the measurement phase.
In order to achieve the above object, an embodiment of a second aspect of the present invention provides an electromagnetic heating apparatus, including a heating control system of the electromagnetic heating apparatus according to the embodiment of the first aspect of the present invention.
According to the electromagnetic heating equipment provided by the embodiment of the invention, the heating control system of the electromagnetic heating equipment can realize the accurate control of the temperature measurement stage of the cookware, so that the noise can be effectively reduced, and the accuracy of the temperature measurement can be improved.
According to one embodiment of the invention, the electromagnetic heating device is an induction cooker, an electromagnetic rice cooker or an electromagnetic pressure cooker.
To achieve the above object, a third aspect of the present invention provides a heating control method for an electromagnetic heating apparatus, the electromagnetic heating apparatus including a resonant circuit, a driving circuit, a first controllable switch, and a signal processing unit, the driving circuit being connected to the resonant circuit, the signal processing unit being connected to the driving circuit through the first controllable switch, the method including the steps of: when the measurement stage is determined to be entered, outputting a first control signal to the driving circuit so that the driving circuit drives the resonant circuit until a first condition is met; when the first condition is met, outputting an excitation trigger signal to the driving circuit to provide self-excitation energy; when the excitation trigger signal is completely output, stopping outputting the first control signal, and controlling the first controllable switch to be conducted, so that the signal processing unit outputs a second control signal to the driving circuit, and the driving circuit drives the resonance circuit to carry out self-excitation oscillation; and acquiring resonance parameters of the resonance circuit in the self-excitation oscillation process of the resonance circuit, and determining the temperature of the cookware according to the resonance parameters.
According to the heating control method of the electromagnetic heating equipment, when the measuring stage is determined to enter, a first control signal is output to the driving circuit so that the driving circuit drives the resonant circuit until the first condition is met, when the first condition is met, an excitation trigger signal is output to the driving circuit to provide self-excitation energy, when the output of the excitation trigger signal is completed, the output of the first control signal is stopped, the first controllable switch is controlled to be conducted, therefore, the signal processing unit outputs a second control signal to the driving circuit so that the driving circuit drives the resonant circuit to conduct self-excitation oscillation, in the process that the resonant circuit conducts self-excitation oscillation, the resonant parameter of the resonant circuit is obtained, and the temperature of the cooker is determined according to the resonant parameter. Therefore, the heating control method of the electromagnetic heating equipment provided by the embodiment of the invention can realize accurate control on the temperature measurement stage of the cookware, thereby effectively reducing noise and improving the accuracy of temperature measurement.
To achieve the above object, a third aspect of the present invention provides a readable storage medium, on which a temperature measurement program of an electromagnetic heating apparatus is stored, the program, when executed by a processor, implementing a heating control method of the electromagnetic heating apparatus according to the third aspect of the present invention.
Drawings
Fig. 1 is a block schematic diagram of a heating control system of an electromagnetic heating apparatus according to an embodiment of the present invention;
FIG. 2 is a block schematic diagram of a heating control system of an electromagnetic heating apparatus according to one embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a heating control system of an electromagnetic heating apparatus according to one embodiment of the present invention;
fig. 4 is a schematic voltage waveform at a point a when the electromagnetic heating apparatus is not heating in the heating control system of the electromagnetic heating apparatus according to one embodiment of the present invention;
fig. 5 is a schematic voltage waveform at a point a when the electromagnetic heating apparatus heats in the heating control system of the electromagnetic heating apparatus according to an embodiment of the present invention;
fig. 6 is a schematic control waveform of an enable signal EN in a heating control system of an electromagnetic heating apparatus according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a PWM port output waveform of a control unit and a driving waveform of a second switching tube in a heating control system of an electromagnetic heating apparatus according to an embodiment of the present invention;
fig. 8 is a flowchart illustrating a heating control method of an electromagnetic heating apparatus according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An electromagnetic heating apparatus, a heating control system thereof, and a method of controlling heating thereof according to embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a block schematic diagram of a heating control system of an electromagnetic heating apparatus according to an embodiment of the present invention. As shown in fig. 1, the heating control system of the electromagnetic heating apparatus of the embodiment of the present invention includes a resonance circuit 10, a drive circuit 20, a first controllable switch 30, a signal processing unit 40, and a control unit 50.
The driving circuit 20 is connected to the resonant circuit 10, and the driving circuit 20 is configured to drive the resonant circuit 10 to perform resonant heating; the signal processing unit 40 is connected with the driving circuit 20 through the first controllable switch 30, and the signal processing unit 40 is further connected with the resonant circuit 10 to acquire the resonant parameters of the resonant circuit 10; the control unit 50 is connected to the first controllable switch 30, the driving circuit 20 and the signal processing unit 40, the control unit 50 is configured to output a first control signal to the driving circuit 20 to drive the resonant circuit 10 by the driving circuit 20 until a first condition is met when it is determined that the measurement phase is entered, output an excitation trigger signal to the driving circuit 20 to provide self-excited energy, and stop outputting the first control signal when the excitation trigger signal is output, and control the first controllable switch 30 to be turned on, so that the signal processing unit 40 outputs a second control signal to the driving circuit 20 to drive the resonant circuit 10 by the driving circuit 20 to perform self-excited oscillation, and the control unit 50 is further configured to obtain a resonant parameter of the resonant circuit 10 during the self-excited oscillation of the resonant circuit 10, and determine the pot temperature according to the resonant parameter.
Specifically, according to an embodiment of the present invention, as shown in fig. 3, the resonant circuit 10 includes a first resonant capacitor C1, a second resonant capacitor C2, a heating coil L2, a first switching tube T1, and a second switching tube T2, one end of the first resonant capacitor C1 is connected to the collector of the first switching tube T1 and serves as an input terminal of the resonant circuit 10, one end of the second resonant capacitor C2 is connected to the other end of the first resonant capacitor C1, and is connected to one end of the heating coil L2, the other end of the second resonant capacitor C2 is grounded, the collector of the second switching tube T2 is connected to the emitter of the first switching tube T1 and to the other end of the heating coil L2, the emitter of the second switching tube T2 is grounded, wherein, the driving circuit 20 drives the resonant circuit 10 to perform self-excited oscillation by controlling the second switch tube T2 to be turned on or off, or by controlling the first switch tube T1 to be turned on or off to drive the resonant circuit 10 to perform self-excited oscillation.
It should be noted that the first switch tube T1 and the second switch tube T2 may be IGBT tubes.
Further, according to an embodiment of the present invention, as shown in fig. 2 to 3, the heating control system of the electromagnetic heating apparatus further includes: and an excitation circuit 70, the excitation circuit 70 being connected to an input of the resonant circuit 10, the excitation circuit 70 being arranged to output an excitation voltage to the input of the resonant circuit 10 during a measurement phase T0.
Further, according to an embodiment of the present invention, as shown in fig. 2 to 3, the heating control system of the electromagnetic heating apparatus further includes: a current transformer 60, the current transformer 60 being for detecting a current flowing through the heating coil L2; among them, the signal processing unit 40 generates a detection signal according to the current flowing through the heating coil L2, and the control unit 50 determines the resonance parameter of the resonance circuit 10 according to the detection signal.
It can be understood that the alternating current input by the alternating current power source 80 is rectified by the rectifier bridge 90 to output a direct current to the resonant circuit 10, and then the driving circuit 20 drives the first power switch T1 and the second power switch T2 to be alternately turned on to invert the rectified direct current into the alternating current, so that the first resonant capacitor C1, the second resonant capacitor C2 and the heating coil L2 can generate resonance.
Under different temperatures, the inductance value of the heating coil L2 changes regularly, so that the free resonant frequency of the first resonant capacitor C1, the second resonant capacitor C2 and the heating coil L2 changes, in the measurement phase T0, the excitation circuit 70 outputs an excitation voltage to the input end of the resonant circuit 10, i.e., point a in the figure, to realize self-excited oscillation of the resonant circuit 10, in the self-excited oscillation process of the resonant circuit 10, the signal processing unit 40 can generate a detection signal according to the current of the heating coil L2 detected by the current transformer 60, the control unit 50 determines the resonant parameter of the resonant circuit 10 according to the detection signal, specifically, the signal processing unit 40 can convert the current signal into a periodic signal readable by the control unit 50, the control unit 50 obtains the resonant frequency according to the periodic signal, and realizes inductance change perception of the heating coil L2 by measuring the resonant frequency, the temperature of the pot and the inductance of the heating coil L2 have a certain relationship, so that the control unit 50 can determine the temperature of the pot according to the obtained resonant frequency.
According to an embodiment of the invention, the control unit 50 is further adapted to determine that the first condition is fulfilled, when it is determined that the time to enter the measurement phase T0 reaches a first time or that the voltage at the input of the resonant circuit 10 reaches the excitation voltage.
It can be understood that, as shown in fig. 5-7, in the process of heating by the electromagnetic heating apparatus, when it is determined that the measurement phase T0 is entered, where the starting point of the phase T0 may be a zero-crossing point of the voltage of the ac power source 80, the zero-crossing point of the voltage of the ac power source 80 may be detected by the zero-crossing detection module 100, and when the zero-crossing point of the voltage is detected, an interrupt is triggered through the INT1 port of the control unit 50, at which time the control unit 50 outputs a first control signal to the driving circuit 20 so that the driving circuit 20 drives the resonant circuit 10, that is, at which time the PWM port of the control unit 50 outputs a PWM signal, that is, the first control signal, so that the driving circuit 20 drives the resonant circuit 10, thereby realizing.
Until it is determined that the time entering the measurement phase T0 reaches the first time or the voltage at the input terminal of the resonant circuit 10 reaches the excitation voltage, that is, the end of the T01 phase in the figure, that is, at the start time of the T02 phase, the control unit 50 outputs the excitation trigger signal, that is, the pulse signal, to the driving circuit 20 to provide the self-excited energy, and when the excitation trigger signal, that is, the pulse signal, is completely output and the driving circuit 20 provides the second switching tube T2 with a complete pulse, the control unit 50 enters the T03 phase, at this time, the control unit 50 stops outputting the first control signal and controls the enable signal EN to be 1, the first controllable switch 30 is enabled to be turned on, so that the signal processing unit 40 outputs the second control signal to the driving circuit 20 to drive the resonant circuit 20 to perform the self-excited oscillation, and when the self-excited oscillation is ended, that is, when the end of the T03 phase in the figure, the control enable signal EN, the first controllable switch 30 is turned off, and the control unit 50 outputs the first control signal, i.e., the PWM signal, to the driving circuit 20 again, thereby restoring the heating state before the stage T0, i.e., the heating state at the stage T1.
In addition, after the voltage zero-crossing interruption occurs, since the control needs that the excitation voltage output by the excitation circuit 70 to the input terminal of the resonance circuit 10, i.e., point a in fig. 3, is generally about 24V, and the voltage at point a when the interruption occurs is higher than the excitation voltage, which is generally about 50V, it is necessary to perform the interruption in advance, and the control unit 50 outputs the excitation trigger signal, i.e., the pulse signal, to the drive circuit 20 to supply the self-excited energy when the time after the interruption occurs reaches the first time, i.e., when it is determined that the time to enter the measurement period T0 reaches the first time, or the voltage at the input terminal of the resonance circuit 10, i.e., point a, reaches the excitation.
Therefore, the voltage at the input end of the resonant circuit 10, i.e. the point a, can be ensured to be kept unchanged in the measurement stage T0, so that the interference caused by the pulsating voltage can be eliminated, the noise can be reduced, and meanwhile, the end time of the period of the PWM signal, which is the first control signal output by the control unit 50 to the driving circuit 20, can be conveniently obtained to prepare for outputting the excitation trigger signal, i.e. the pulse signal, to the driving circuit 20 subsequently.
As shown in fig. 4, when the electromagnetic heating device is not heating, the voltage at the input end of the resonant circuit 10, i.e., the point a, remains substantially unchanged due to the presence of the filter capacitor C3. When the electromagnetic heating device is used for heating, as shown in fig. 5, the heating power is increased, and the capacity of the filter capacitor C3 is limited, so that a pulsating voltage is formed at the point a, and in the vicinity of the voltage zero crossing point, i.e., at the stage T0 in the figure, the minimum voltage at the point a is maintained around the voltage UK supplied by the exciting circuit 70 due to the action of the exciting circuit 70 (considering the voltage drop of the diode D1, the minimum voltage at the point a is maintained at UK-0.7V, and the voltage drop of the diode D1 is 0.7V).
Further, according to an embodiment of the present invention, the first control signal is a PWM signal, the excitation trigger signal is a pulse signal, and a pulse width d0 of the pulse signal is greater than or equal to 1/2 of an on width dx of the PWM signal.
It can be understood that, as shown in fig. 7, upon determining that the time to enter the measurement period T0 reaches the first time or the voltage at the input terminal of the resonance circuit 10, i.e., point a, reaches the excitation voltage, the control unit 50 outputs the excitation trigger signal, i.e., the pulse signal, to the driving circuit 20 to provide the self-excited energy, thereby enabling the driving signal to smoothly transit.
It should be understood that if the control unit 50 does not output the excitation trigger signal to the driving circuit 20, i.e., does not provide the self-excitation energy, when it is determined that the time entering the measurement phase T0 reaches the first time or the voltage at the input terminal of the resonant circuit 10, i.e., the point a, reaches the excitation voltage, i.e., when the phase entering T02 is started, the oscillation energy is insufficient due to the energy consumption of the cooker, so that the next oscillation cannot be started, therefore, when the phase entering T02 is started, the control unit 50 needs to output the excitation trigger signal, i.e., the pulse signal, to the driving circuit 20, and the pulse width d0 of the pulse signal is greater than or equal to 1/2 of the on width dx of the first control signal, i.e., the PWM signal, i.e., d0 ≧ 1/2 dx.
It should be noted that, as shown in fig. 7, since the control unit 50 outputs the excitation trigger signal to the driving circuit 20 to provide the self-excited energy when it is determined that the time entering the measurement phase T0 reaches the first time or the voltage at the input terminal of the resonant circuit 10 reaches the excitation voltage, i.e., when it enters the phase T02, the pulse width d1 of the driving signal provided by the driving circuit 20 to the second switching tube T2 is greater than the pulse width df of the driving signal output subsequently.
In addition, as shown in fig. 7, during a normal heating phase, such as a phase T1, since there is an off delay of the IGBT, the driving signal provided by the driving circuit 20 to the second switching tube T2 lags behind the PWM signal output by the control unit 50 by dt time, which may be a half-bridge control dead time formed by the first switching tube T1 and the second switching tube T2, to prevent the first switching tube T1 and the second switching tube T2 from being turned on simultaneously, and dt may be set by the driving circuit 20.
According to an embodiment of the present invention, the duration for which the signal processing unit 40 outputs the second control signal to the driving circuit 20 is greater than or equal to 100 us.
It will be appreciated that the time during which the resonant circuit 10 is self-excited to oscillate, i.e. the duration of the phase T03 in fig. 6-7, is greater than or equal to 100us, at the end of the self-excited oscillation, i.e. at the end of the phase T03, the control unit 50 controls the first controllable switch 30 to be open, and the control unit 50 again outputs the first control signal, i.e. the PWM signal, so as to resume the heating state before the measurement phase, i.e. before the phase T0, i.e. at the stage T1.
Further, according to an embodiment of the present invention, the control unit 50 is further configured to obtain the resonance parameter of the resonant circuit 10 multiple times, and determine the pot temperature according to the obtained resonance parameter multiple times.
It can be understood that during the self-excited oscillation of the resonant circuit 10, i.e. at the stage T03, the control unit 50 obtains the resonance parameters of the resonant circuit 10 through the TR _ IN port for a plurality of times, for example, obtains N self-excited oscillation cycles, and optimizes the measurement data through a software algorithm such as software filtering, where N is an integer greater than or equal to 2, thereby improving the accuracy of the measurement data.
In summary, according to the heating control system of the electromagnetic heating apparatus of the embodiment of the invention, the resonant circuit is driven by the driving circuit to perform resonant heating, the signal processing unit is used for acquiring resonance parameters of the resonance circuit, and when the control unit determines to enter a measuring stage, outputting a first control signal to the drive circuit for the drive circuit to drive the resonant circuit until a first condition is met, outputting an excitation trigger signal to the drive circuit to provide self-excited energy, and when the excitation trigger signal is output, the first control signal is stopped to be output and the first controllable switch is controlled to be conducted, the signal processing unit outputs a second control signal to the driving circuit so that the driving circuit drives the resonant circuit to perform self-excitation oscillation, and the control unit also obtains the resonant parameters of the resonant circuit in the self-excitation oscillation process of the resonant circuit and determines the temperature of the cookware according to the resonant parameters. Therefore, the heating control system of the electromagnetic heating equipment provided by the embodiment of the invention can realize accurate control on the temperature measurement stage of the cookware, so that the noise can be effectively reduced, and the accuracy of temperature measurement can be improved.
Based on the heating control system of the electromagnetic heating device in the above embodiment, an embodiment of the present invention further provides an electromagnetic heating device, including the heating control system of the electromagnetic heating device.
According to one embodiment of the present invention, the electromagnetic heating apparatus is an induction cooker, an electromagnetic rice cooker, or an electromagnetic pressure cooker.
In summary, according to the electromagnetic heating device provided by the embodiment of the invention, the heating control system of the electromagnetic heating device can be used for accurately controlling the temperature measurement stage of the cookware, so that the noise can be effectively reduced, and the accuracy of temperature measurement can be improved.
Based on the heating control system of the electromagnetic heating device in the above embodiment, the embodiment of the invention also provides a heating control method of the electromagnetic heating device.
Fig. 8 is a flowchart illustrating a heating control method of an electromagnetic heating apparatus according to an embodiment of the present invention. The electromagnetic heating device comprises a resonance circuit, a driving circuit, a first controllable switch and a signal processing unit, wherein the driving circuit is connected with the resonance circuit, the signal processing unit is connected with the driving circuit through the first controllable switch, as shown in fig. 8, the heating control method of the electromagnetic heating device comprises the following steps:
s1, upon determining that the measurement phase is entered, outputting a first control signal to the drive circuit so that the drive circuit drives the resonance circuit until a first condition is satisfied.
And S2, when the first condition is met, outputting an excitation trigger signal to the driving circuit to provide self-excitation energy.
And S3, when the excitation trigger signal is completely output, stopping outputting the first control signal and controlling the first controllable switch to be conducted, so that the signal processing unit outputs a second control signal to the driving circuit, and the driving circuit drives the resonant circuit to carry out self-excited oscillation.
S4, obtaining the resonance parameter of the resonance circuit in the process of self-excitation oscillation of the resonance circuit, and determining the temperature of the cookware according to the resonance parameter.
It should be noted that the foregoing explanation of the heating control system of the electromagnetic heating device is also applicable to the heating control method of the electromagnetic heating device of this embodiment, and is not repeated here.
In summary, according to the heating control method of the electromagnetic heating apparatus in the embodiment of the present invention, when it is determined that the measurement phase is entered, the first control signal is output to the driving circuit so that the driving circuit drives the resonant circuit until the first condition is met, when the first condition is met, the excitation trigger signal is output to the driving circuit to provide the self-excited energy, when the output of the excitation trigger signal is completed, the output of the first control signal is stopped, and the first controllable switch is controlled to be turned on, so that the signal processing unit outputs the second control signal to the driving circuit so that the driving circuit drives the resonant circuit to perform the self-excited oscillation, and during the self-excited oscillation of the resonant circuit, the resonant parameter of the resonant circuit is obtained, and the temperature of the pot is determined according to the resonant parameter. Therefore, the heating control method of the electromagnetic heating equipment provided by the embodiment of the invention can realize accurate control on the temperature measurement stage of the cookware, thereby effectively reducing noise and improving the accuracy of temperature measurement.
Based on the heating control method of the electromagnetic heating device in the above embodiment, an embodiment of the present invention further provides a readable storage medium, on which a temperature measurement program of the electromagnetic heating device is stored, and the program is executed by a processor to implement the heating control method of the electromagnetic heating device.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (12)
1. A heating control system of an electromagnetic heating apparatus, comprising:
a resonant circuit;
the driving circuit is connected with the resonance circuit and is used for driving the resonance circuit to perform resonance heating;
a first controllable switch;
the signal processing unit is connected with the driving circuit through the first controllable switch and is also connected with the resonant circuit to acquire resonant parameters of the resonant circuit;
a control unit, connected to the first controllable switch, the driving circuit and the signal processing unit, for outputting a first control signal to the driving circuit to drive the resonant circuit when it is determined that the measurement stage is entered, and outputting an excitation trigger signal to the driving circuit to provide self-excited energy until a first condition is met, and stopping outputting the first control signal when the excitation trigger signal is output, and controlling the first controllable switch to be turned on, so that the signal processing unit outputs a second control signal to the driving circuit to drive the resonant circuit to perform self-excited oscillation, and for acquiring a resonant parameter of the resonant circuit during the self-excited oscillation of the resonant circuit, and determining the temperature of the cookware according to the resonance parameters.
2. A heating control system of an electromagnetic heating apparatus according to claim 1, characterized in that the control unit is further configured to determine that the first condition is fulfilled when it is determined that the time to enter the measurement phase reaches a first time or that the voltage at the input of the resonant circuit reaches an excitation voltage.
3. The heating control system of an electromagnetic heating apparatus according to claim 1, wherein the first control signal is a PWM signal, and the excitation trigger signal is a pulse signal having a pulse width greater than or equal to 1/2 of an on width of the PWM signal.
4. The heating control system of an electromagnetic heating apparatus according to claim 1, characterized in that the signal processing unit outputs the second control signal to the drive circuit for a duration greater than or equal to 100 us.
5. A heating control system of an electromagnetic heating apparatus according to claim 1, wherein the control unit is further configured to obtain the resonance parameter of the resonance circuit a plurality of times, and determine the pot temperature according to the resonance parameter obtained a plurality of times.
6. The heating control system of an electromagnetic heating apparatus according to claim 1, wherein the resonance circuit includes a first resonance capacitor, a second resonance capacitor, a heating coil, a first switching tube, and a second switching tube, one end of the first resonance capacitor is connected to a collector of the first switching tube and serves as an input terminal of the resonance circuit, one end of the second resonance capacitor is connected to the other end of the first resonance capacitor and to one end of the heating coil, the other end of the second resonance capacitor is grounded, a collector of the second switching tube is connected to an emitter of the first switching tube and to the other end of the heating coil, and an emitter of the second switching tube is grounded, wherein the driving circuit drives the resonance circuit to self-excite oscillation by controlling the second switching tube to be turned on or off, or the first switching tube is controlled to be switched on or switched off to drive the resonant circuit to carry out self-excitation oscillation.
7. A heating control system of an electromagnetic heating apparatus according to claim 1, characterized by further comprising:
a current transformer for detecting a current flowing through the heating coil;
wherein the signal processing unit generates a detection signal according to the current flowing through the heating coil, and the control unit determines the resonance parameter of the resonance circuit according to the detection signal.
8. A heating control system of an electromagnetic heating apparatus according to claim 1, characterized by further comprising:
an excitation circuit connected to an input of the resonant circuit, the excitation circuit for outputting an excitation voltage to the input of the resonant circuit during the measurement phase.
9. An electromagnetic heating apparatus, characterized by comprising a heating control system of an electromagnetic heating apparatus according to any one of claims 1 to 8.
10. The electromagnetic heating apparatus according to claim 9, wherein the electromagnetic heating apparatus is an induction cooker, an electromagnetic rice cooker, or an electromagnetic pressure cooker.
11. A heating control method of an electromagnetic heating apparatus, characterized in that the electromagnetic heating apparatus comprises a resonance circuit, a drive circuit, a first controllable switch and a signal processing unit, the drive circuit is connected with the resonance circuit, the signal processing unit is connected with the drive circuit through the first controllable switch, the method comprises the steps of:
when the measurement stage is determined to be entered, outputting a first control signal to the driving circuit so that the driving circuit drives the resonant circuit until a first condition is met;
when the first condition is met, outputting an excitation trigger signal to the driving circuit to provide self-excitation energy;
when the excitation trigger signal is completely output, stopping outputting the first control signal, and controlling the first controllable switch to be conducted, so that the signal processing unit outputs a second control signal to the driving circuit, and the driving circuit drives the resonance circuit to carry out self-excitation oscillation; and
and in the process of self-excitation oscillation of the resonant circuit, acquiring the resonant parameters of the resonant circuit, and determining the temperature of the cookware according to the resonant parameters.
12. A readable storage medium, characterized in that a temperature measuring program of an electromagnetic heating apparatus is stored thereon, which when executed by a processor, implements a heating control method of the electromagnetic heating apparatus according to claim 11.
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|---|---|---|---|---|
| CN102186271A (en) * | 2009-11-26 | 2011-09-14 | E.G.O.电气设备制造股份有限公司 | Method and induction heating device for determining a temperature of the base of a cooking vessel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102186271A (en) * | 2009-11-26 | 2011-09-14 | E.G.O.电气设备制造股份有限公司 | Method and induction heating device for determining a temperature of the base of a cooking vessel |
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