CN107155229B - Electromagnetic heating cooking device and heating control circuit and control method thereof - Google Patents
Electromagnetic heating cooking device and heating control circuit and control method thereof Download PDFInfo
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- CN107155229B CN107155229B CN201610121804.6A CN201610121804A CN107155229B CN 107155229 B CN107155229 B CN 107155229B CN 201610121804 A CN201610121804 A CN 201610121804A CN 107155229 B CN107155229 B CN 107155229B
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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
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Abstract
The invention discloses an electromagnetic heating cooking device and a heating control circuit and a control method thereof, wherein the heating control circuit comprises: the main resonance heating module comprises a heating coil, a resonance capacitor and a resonance switch tube; the rectifier module converts alternating current provided by the alternating current power supply into direct current; a filtering module; the driving module is connected with the control electrode of the resonant switching tube to drive the resonant switching tube to be switched on or switched off; the auxiliary heating module is connected with the output end of the rectifying module; the zero-crossing detection module is used for detecting the zero-crossing point of the alternating current power supply to generate a zero-crossing signal; and the control module controls the auxiliary heating module to perform heating and discharging work according to a first zero-crossing point in the zero-crossing signal, and then outputs a driving control signal to the driving module according to a second zero-crossing point in the zero-crossing signal so as to control the main resonant heating module to perform heating work, so that the C-pole voltage of a resonant switching tube such as an IGBT tube is reduced, the impact current of the resonant switching tube is reduced, and the resonant switching tube is prevented from being damaged.
Description
Technical Field
The invention relates to the technical field of electric appliances, in particular to a heating control circuit of an electromagnetic heating cooking device, the electromagnetic heating cooking device and a control method of the heating control circuit of the electromagnetic heating cooking device.
Background
An electromagnetic heating cooking device such as an electromagnetic rice cooker in the related art performs resonant heating by controlling a resonant switching tube to be turned on or off. However, the related art has the disadvantage that due to the existence of the filter capacitor, the rectified and filtered direct current voltage is 1.4 times of the alternating current voltage, so that the resonant switching tube is turned on hard when the resonant heating is started, and the impact current of the resonant switching tube is too large at the moment, which easily causes the resonant switching tube to be damaged. Therefore, improvements are needed in the related art.
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, an object of the present invention is to provide a heating control circuit of an electromagnetic heating cooking device, which can reduce an inrush current through a resonant switching tube when resonant heating is started.
Another object of the present invention is to provide an electromagnetic heating cooking apparatus. Another object of the present invention is to provide a control method of a heating control circuit of an electromagnetic heating cooking device.
In order to achieve the above object, an embodiment of the present invention provides a heating control circuit for an electromagnetic heating cooking device, including: the main resonance heating module comprises a heating coil, a resonance capacitor and a resonance switch tube; the rectifier module converts alternating current provided by the alternating current power supply into direct current; the input end of the filtering module is connected with the output end of the rectifying module, the output end of the filtering module is connected with the main resonant heating module, and the filtering module is used for filtering the direct current and supplying the filtered direct current to the main resonant heating module; the driving module is connected with the control electrode of the resonant switching tube to drive the resonant switching tube to be switched on or switched off; the auxiliary heating module is connected with the output end of the rectifying module; a zero-crossing detection module for detecting a zero-crossing point of the AC power source to generate a zero-crossing signal; the control module is respectively connected with the zero-crossing detection module, the auxiliary heating module and the driving module, and after controlling the auxiliary heating module to perform heating and discharging work according to a first zero-crossing point in the zero-crossing signal, the control module outputs a driving control signal to the driving module according to a second zero-crossing point in the zero-crossing signal so as to control the main resonant heating module to perform heating work.
According to the heating control circuit of the electromagnetic heating cooking device, the auxiliary heating module is connected with the output end of the rectifying module, the zero-crossing detection module detects the zero-crossing point of the alternating-current power supply to generate the zero-crossing signal, and the control module controls the auxiliary heating module to perform heating discharge work according to the first zero-crossing point in the zero-crossing signal and then outputs the driving control signal to the driving module according to the second zero-crossing point in the zero-crossing signal to control the main resonant heating module to perform heating work. Therefore, the auxiliary heating module is controlled to heat and discharge in advance before the main resonant heating module is started, so that the voltage of the C electrode of the resonant switch tube such as an IGBT tube is reduced, the impact current passing through the resonant switch tube when the main resonant heating module is started is reduced, and the resonant switch tube is prevented from being damaged.
According to one embodiment of the present invention, the auxiliary heating module includes: one end of the first heating unit is connected with the output end of the rectifying module; the first driving unit is connected with the other end of the first heating unit so as to drive the first heating unit; the control module is connected with the control end of the first driving unit to control the first heating unit to heat or stop heating.
According to an embodiment of the present invention, the first driving unit includes: one end of the first resistor is connected with the control module; a base electrode of the first switch tube is connected with the other end of the first resistor, and a collector electrode of the first switch tube is connected with a preset power supply; one end of the second resistor is connected with the emitting electrode of the first switching tube; one end of the third resistor and the other end of the second resistor are grounded, the other end of the third resistor is grounded, and a first node is arranged between the second resistor and the third resistor; and the base electrode of the second switching tube is connected with the first node, the collector electrode of the second switching tube is connected with the other end of the first heating unit, and the emitting electrode of the second switching tube is grounded.
According to one embodiment of the invention, the auxiliary heating module further comprises: one end of the second heating unit is respectively connected with the output end of the rectifying module and one end of the first heating unit; the second driving unit is connected with the other end of the second heating unit so as to drive the second heating unit; the control module is connected with the control end of the second driving unit to control the second heating unit to heat or stop heating.
According to an embodiment of the present invention, the second driving unit includes: one end of the fourth resistor is connected with the control module; a base electrode of the third switching tube is connected with the other end of the fourth resistor, and a collector electrode of the third switching tube is connected with a preset power supply; one end of the fifth resistor is connected with an emitting electrode of the third switching tube; one end of the sixth resistor and the other end of the fifth resistor are grounded, the other end of the sixth resistor is grounded, and a second node is arranged between the fifth resistor and the sixth resistor; and the base electrode of the fourth switching tube is connected with the second node, the collector electrode of the fourth switching tube is connected with the other end of the second heating unit, and the emitting electrode of the fourth switching tube is grounded.
According to one embodiment of the invention, the first heating unit is arranged on the top of the electromagnetic heating cooking device, and the second heating unit is arranged on the side wall of the electromagnetic heating cooking device.
According to one embodiment of the invention, the first heating unit and the second heating unit are both heating resistance wires.
According to an embodiment of the invention, the first zero-crossing and the second zero-crossing are located within the same half-wave period of the alternating current.
In order to achieve the above object, in another aspect, the present invention provides an electromagnetic heating cooking device, including a heating control circuit of the electromagnetic heating cooking device.
According to the electromagnetic heating cooking device provided by the embodiment of the invention, through the heating control circuit of the electromagnetic heating cooking device, the C-pole voltage of a resonant switching tube such as an IGBT tube can be reduced, the impact current passing through the resonant switching tube when the main resonant heating module is started is reduced, and the resonant switching tube is prevented from being damaged.
In order to achieve the above object, another embodiment of the present invention provides a control method for a heating control circuit of an electromagnetic heating cooking device, including the following steps: detecting a zero crossing point of an alternating current power supply to generate a zero crossing signal; and after the auxiliary heating module is controlled to perform heating and discharging work according to a first zero-crossing point in the zero-crossing signal, a driving control signal is output to the driving module according to a second zero-crossing point in the zero-crossing signal so as to control the main resonant heating module to perform heating work.
According to the control method of the heating control circuit of the electromagnetic heating cooking device, provided by the embodiment of the invention, the zero crossing point of the alternating current power supply is detected to generate the zero crossing signal, then the auxiliary heating module is controlled to perform heating and discharging work according to the first zero crossing point in the zero crossing signal, and then the driving control signal is output to the driving module according to the second zero crossing point in the zero crossing signal to control the main resonant heating module to perform heating work. Therefore, the auxiliary heating module is controlled to heat and discharge in advance before the main resonant heating module is started, so that the voltage of the C electrode of the resonant switch tube such as an IGBT tube is reduced, the impact current passing through the resonant switch tube when the main resonant heating module is started is reduced, and the resonant switch tube is prevented from being damaged.
According to an embodiment of the invention, the first zero-crossing and the second zero-crossing are located within the same half-wave period of the alternating current supplied by the alternating current source.
Drawings
FIG. 1 is a block schematic diagram of a heating control circuit of an electromagnetic heating cooking device according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a heating control circuit of an electromagnetic heating cooking device according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a heating control circuit of an electromagnetic heating cooking device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a control waveform of a heating control circuit of an electromagnetic heating cooking device according to an embodiment of the present invention; and
fig. 5 is a flowchart of a control method of a heating control circuit of an electromagnetic heating cooking apparatus according to an embodiment of the present invention.
Reference numerals are as follows:
the device comprises a main resonant heating module 10, a rectifying module 20, a filtering module 30, a driving module 40, an auxiliary heating module 50, a zero-crossing detection module 60 and a control module 70;
the device comprises a fuse F1, a piezoresistor MOV, a filter inductor L1, a filter capacitor C1, a heating coil L2, a resonance capacitor C2 and a resonance switch tube 11;
the first heating unit 51, the first driving unit 52, the first resistor R1, the first switching tube Q1, the second resistor R2, the third resistor R3 and the second switching tube Q2;
the heating device comprises a second heating unit 53, a second driving unit 54, a fourth resistor R4, a third switching tube Q3, a fifth resistor R5, a sixth resistor R6 and a fourth switching tube Q4.
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 reference numerals refer to the same or similar elements or elements having the same or similar functions 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.
A heating control circuit of an electromagnetic heating cooking apparatus, and a control method of a heating control circuit of an electromagnetic heating cooking apparatus according to embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a block schematic diagram of a heating control circuit of an electromagnetic heating cooking apparatus according to an embodiment of the present invention. As shown in fig. 1, the heating control circuit of the electromagnetic heating cooking device includes: a primary resonant heating module 10, a rectifier module 20, a filter module 30, a drive module 40, an auxiliary heating module 50, a zero-crossing detection module 60, and a control module 70.
Wherein, main resonance heating module 10 includes heating coil, resonance electric capacity and resonance switch tube, specifically, heating coil and resonance electric capacity carry out the resonance and produce periodic variation's magnetic field at the in-process that resonance switch tube switches on or shuts off, and magnetic field effect is at the bottom of a boiler of pan, makes the bottom of a boiler produce the vortex and produce the heat simultaneously, and main resonance heating module 10 carries out electromagnetic resonance heating to the pan from this. According to a specific example of the present invention, the resonant switch tube may be a high voltage transistor, a MOSFET tube, an IGBT tube, or the like.
The rectifier module 20 converts the alternating current provided by the alternating current power supply into direct current; the input end of the filtering module 30 is connected to the output end of the rectifying module 20, the output end of the filtering module 30 is connected to the main resonant heating module 10, and the filtering module 30 filters the direct current and supplies the filtered direct current to the main resonant heating module 10.
The driving module 40 is connected with the control electrode of the resonant switching tube to drive the resonant switching tube to be switched on or switched off; the auxiliary heating module 50 is connected with the output end of the rectifying module 20; the zero-crossing detection module 60 is configured to detect a zero-crossing point of the ac power to generate a zero-crossing signal, for example, the zero-crossing detection module 60 may detect a voltage zero-crossing point of the ac power to generate a zero-crossing signal; the control module 70 is respectively connected to the zero-crossing detection module 60, the auxiliary heating module 50 and the driving module 40, and after the control module 70 controls the auxiliary heating module 50 to perform heating and discharging operations according to a first zero-crossing point in the zero-crossing signal, the control module 70 outputs a driving control signal to the driving module 40 according to a second zero-crossing point in the zero-crossing signal to control the main resonant heating module 10 to perform heating operations.
According to an embodiment of the invention, the first zero-crossing and the second zero-crossing may be located within the same half-wave period of the alternating current, in other words, the first zero-crossing and the second zero-crossing are two adjacent zero-crossings. As shown in fig. 4, the previous zero-crossing point in the half-wave period T is the first zero-crossing point, and the next zero-crossing point in the half-wave period T is the second zero-crossing point. It should be understood that the first zero-crossing and the second zero-crossing may also be located within different half-wave periods, in other words, the first zero-crossing and the second zero-crossing may be separated by at least one zero-crossing.
Specifically, before the main resonant heating module 10 is started, the zero-crossing detection module 60 detects a zero-crossing point of the alternating current, and outputs a zero-crossing signal to the control module 70 when an instantaneous value of the alternating current crosses zero, the control module 70 determines that a first zero-crossing point is detected when receiving a first zero-crossing signal, at this time, the control module 70 controls the auxiliary heating module 50 to heat in advance, and the filter module 30 discharges electricity through the auxiliary heating module 50, so that the voltage after filtering, for example, the voltage at a point a in fig. 2, is reduced, and further, the voltage of the C-pole of the resonant switching tube, for example, an IGBT tube, is reduced, so that the impact current passing through the resonant switching tube, for example, the IGBT tube, is reduced when the resonant heating is started. Then, when receiving the second zero-crossing signal, control module 70 determines that the second zero-crossing point is detected, at this time, control module 70 immediately outputs a driving control signal, for example, a PPG pulse signal, to driving module 40, at this time, driving module 40 drives the resonant switch tube to be turned on or off according to the driving control signal, so as to control main resonant heating module 10 to perform electromagnetic heating, and at the same time, control module 70 controls auxiliary heating module 50 to stop heating.
Therefore, the heating control circuit of the electromagnetic heating cooking device provided by the embodiment of the invention controls the auxiliary heating module to heat and discharge in advance before the main resonant heating module is started, so that the C-pole voltage of a resonant switching tube such as an IGBT tube is reduced, the impact current passing through the resonant switching tube when the main resonant heating module is started is reduced, and the resonant switching tube is prevented from being damaged.
The circuit structure and the operation principle of the heating control circuit of the electromagnetic heating cooking device according to the embodiment of the present invention will be described with reference to fig. 2 to 4.
According to one embodiment of the present invention, as shown in fig. 2 and 3, the rectifying module 20 has a first input terminal and a second input terminal, the first input terminal of the rectifying module 20 is connected to the live line L of the ac power source through a fuse F1, the second input terminal of the rectifying module 20 is connected to the neutral line N of the ac power source, and the voltage dependent resistor MOV is connected in parallel between the first input terminal and the second input terminal of the rectifying module 20.
The rectifier module 20 has a first output end and a second output end, the second output end of the rectifier module 20 is grounded, the filter module 30 includes a filter inductor L1 and a filter capacitor C1, one end of the filter inductor L1 is connected to the first output end of the rectifier module 20, one end of the filter capacitor C1 is connected to the other end of the filter inductor L1, the other end of the filter capacitor C1 is grounded, and a third node a is provided between the filter inductor L1 and the filter capacitor C1.
According to an embodiment of the present invention, as shown in fig. 2 and 3, a heating coil L2 and a resonance capacitor C2 are connected in parallel, one end of the heating coil L2 and the resonance capacitor C2 connected in parallel is connected to a third node a, one end of a resonance switching tube 11, for example, a C pole of an IGBT tube, is connected to the other end of the heating coil L2 and the resonance capacitor C2 connected in parallel, the other end of the resonance switching tube 11, for example, an E pole of the IGBT tube, is grounded, and a control end of the resonance switching tube 11, for example, a G pole of the IGBT tube, is connected to a driving module 40.
According to an embodiment of the present invention, as shown in fig. 2 and 3, the supplemental heating module 50 includes: a first heating unit 51 and a first driving unit 52. Wherein, one end of the first heating unit 51 is connected to the output end of the rectifier module 20, i.e. the first output end; the first driving unit 52 is connected to the other end of the first heating unit 51 to drive the first heating unit 51; the control module 70 is connected to a control terminal of the first driving unit 52 to control the first heating unit 51 to perform heating or stop heating.
That is, when the control module 70 controls the first driving unit 52 to be turned on, the first heating unit 51 performs a heating discharge operation; when the control module 70 controls the first driving unit 52 to be turned off, the first heating unit 51 stops heating.
Specifically, as shown in fig. 3, the first driving unit 52 includes: the circuit comprises a first resistor R1, a first switch tube Q1, a second resistor R2, a third resistor R3 and a second switch tube Q2.
One end of the first resistor R1 is connected to the control module 70; the base electrode of the first switch tube Q1 is connected with the other end of the first resistor R1, and the collector electrode of the first switch tube Q1 is connected with a preset power supply VDD; one end of the second resistor R2 is connected with the emitting electrode of the first switching tube Q1; one end of the third resistor R3 is grounded with the other end of the second resistor R2, the other end of the third resistor R3 is grounded, and a first node is arranged between the second resistor R2 and the third resistor R3; the base of the second switching tube Q2 is connected to the first node, the collector of the second switching tube Q2 is connected to the other end of the first heating unit 51, and the emitter of the second switching tube Q2 is grounded.
According to an embodiment of the present invention, as shown in fig. 2 and 3, the supplemental heating module 52 may further include: a second heating unit 53 and a second driving unit 54.
Wherein, one end of the second heating unit 54 is connected to the output end of the rectifier module 20, i.e. the first output end, and one end of the first heating unit 51, respectively; the second driving unit 54 is connected to the other end of the second heating unit 53 to drive the second heating unit 53; the control module 70 is connected to a control terminal of the second driving unit 54 to control the second heating unit 53 to perform heating or stop heating.
That is, when the control module 70 controls the second driving unit 54 to be turned on, the second heating unit 53 performs a heating discharge operation; when the control module 70 controls the second driving unit 54 to be turned off, the second heating unit 53 stops heating.
Specifically, as shown in fig. 3, the second driving unit 54 includes: a fourth resistor R4, a third switch tube Q3, a fifth resistor R5, a sixth resistor R6 and a fourth switch tube Q4.
One end of the fourth resistor R4 is connected to the control module 70; the base electrode of the third switching tube Q3 is connected with the other end of the fourth resistor R4, and the collector electrode of the third switching tube Q3 is connected with a preset power supply VDD; one end of a fifth resistor R5 is connected with an emitting electrode of the third switching tube Q3; one end of the sixth resistor R6 is grounded with the other end of the fifth resistor R5, the other end of the sixth resistor R6 is grounded, and a second node is arranged between the fifth resistor R5 and the sixth resistor R6; the base of the fourth switching tube Q4 is connected to the second node, the collector of the fourth switching tube Q4 is connected to the other end of the second heating unit 53, and the emitter of the fourth switching tube Q4 is grounded.
Specifically, the auxiliary heater module 50 is controlled to heat the workpiece in advance before the main resonant heater module 10 is controlled to start. As shown in fig. 4, at the previous zero-crossing point of the half-wave cycle, the zero-crossing detection module 60 outputs a first zero-crossing signal to the control module 70, the control module 70 determines that the first zero-crossing point is detected, and outputs a high level signal to the first driving unit 52 through the first port B, and outputs a high level signal to the second driving unit 54 through the second port C, so that the first switching tube Q1 and the third switching tube Q3 are turned on, after the first switching tube Q1 and the third switching tube Q3 are turned on, the second switching tube Q2 and the fourth switching tube Q4 are turned on, the first heating unit 51 and the second heating unit 52 perform heating and discharging operations, the voltage at the point a gradually decreases, and the voltage at the point C of the IGBT correspondingly decreases. At the latter zero crossing point of the half-wave cycle, the zero-crossing detection module 60 outputs a second zero-crossing signal to the control module 70, the control module 70 determines that the second zero crossing point is detected, and outputs a driving control signal, such as a PPG pulse signal, to the driving module 40 through the third port D, the driving module 40 drives the resonant switching tube 11 to operate, at this time, the voltage at the point a drops below a preset voltage threshold, so as to reduce the impact current passing through the resonant switching tube when the main resonant heating module 10 is started, and simultaneously, outputs a low-level signal to the first driving unit 52 through the first port B, and outputs a low-level signal to the second driving unit 54 through the second port C, so that the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, and the fourth switching tube Q4 are turned off, and the first heating unit 51 and the second heating unit 52 stop heating.
According to an embodiment of the present invention, the first heating unit 51 may be disposed at the top of the electromagnetic heating cooking apparatus, and the second heating unit 53 may be disposed at a sidewall of the electromagnetic heating cooking apparatus. Specifically, the first heating unit 51 and the second heating unit 53 are both heating resistance wires.
In summary, according to the heating control circuit of the electromagnetic heating cooking device provided by the embodiment of the present invention, the auxiliary heating module is connected to the output end of the rectifying module, the zero-crossing detection module detects a zero-crossing point of the ac power supply to generate a zero-crossing signal, and the control module controls the auxiliary heating module to perform heating discharge operation according to a first zero-crossing point in the zero-crossing signal, and then outputs a driving control signal to the driving module according to a second zero-crossing point in the zero-crossing signal to control the main resonant heating module to perform heating operation. Therefore, the auxiliary heating module is controlled to heat and discharge in advance before the main resonant heating module is started, so that the voltage of the C electrode of the resonant switch tube such as an IGBT tube is reduced, the impact current passing through the resonant switch tube when the main resonant heating module is started is reduced, and the resonant switch tube is prevented from being damaged.
The embodiment of the invention also provides an electromagnetic heating cooking device which comprises the heating control circuit of the electromagnetic heating cooking device.
According to the electromagnetic heating cooking device provided by the embodiment of the invention, the heating control circuit of the electromagnetic heating cooking device can reduce the C-voltage of the resonant switching tube such as an IGBT tube, reduce the impact current passing through the resonant switching tube when the main resonant heating module is started, and prevent the resonant switching tube from being damaged.
The embodiment of the invention also provides a control method of the heating control circuit of the electromagnetic heating cooking device.
Fig. 5 is a flowchart of a control method of a heating control circuit of an electromagnetic heating cooking apparatus according to an embodiment of the present invention. As shown in fig. 5, the method comprises the steps of:
s1: zero-crossing points of an alternating current power source are detected to generate a zero-crossing signal.
S2: and after the auxiliary heating module is controlled to perform heating and discharging work according to a first zero-crossing point in the zero-crossing signal, a driving control signal is output to the driving module according to a second zero-crossing point in the zero-crossing signal so as to control the main resonant heating module to perform heating work.
According to an embodiment of the invention, the first zero-crossing and the second zero-crossing are located within the same half-wave period of the alternating current supplied by the alternating current source.
In summary, according to the control method of the heating control circuit of the electromagnetic heating cooking apparatus provided by the embodiment of the present invention, the zero-crossing point of the ac power supply is detected to generate the zero-crossing signal, and then the auxiliary heating module is controlled to perform the heating discharge operation according to the first zero-crossing point in the zero-crossing signal, and then the driving control signal is output to the driving module according to the second zero-crossing point in the zero-crossing signal to control the main resonant heating module to perform the heating operation. Therefore, the auxiliary heating module is controlled to heat and discharge in advance before the main resonant heating module is started, so that the voltage of the C electrode of the resonant switch tube such as an IGBT tube is reduced, the impact current passing through the resonant switch tube when the main resonant heating module is started is reduced, and the resonant switch tube is prevented from being damaged.
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 to implicitly indicate 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. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
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 (11)
1. A heating control circuit of an electromagnetic heating cooking device, comprising:
the main resonance heating module comprises a heating coil, a resonance capacitor and a resonance switch tube;
the rectifier module converts alternating current provided by the alternating current power supply into direct current;
the input end of the filtering module is connected with the output end of the rectifying module, the output end of the filtering module is connected with the main resonant heating module, and the filtering module is used for filtering the direct current and supplying the filtered direct current to the main resonant heating module;
the driving module is connected with the control electrode of the resonant switching tube to drive the resonant switching tube to be switched on or switched off;
the auxiliary heating module is connected with the output end of the rectifying module;
a zero-crossing detection module for detecting a zero-crossing point of the AC power source to generate a zero-crossing signal;
the control module is respectively connected with the zero-crossing detection module, the auxiliary heating module and the driving module, and after controlling the auxiliary heating module to perform heating and discharging work according to a first zero-crossing point in the zero-crossing signal, the control module outputs a driving control signal to the driving module according to a second zero-crossing point in the zero-crossing signal so as to control the main resonant heating module to perform heating work.
2. The heating control circuit of the electromagnetic heating cooking device according to claim 1, wherein the auxiliary heating module includes:
one end of the first heating unit is connected with the output end of the rectifying module;
the first driving unit is connected with the other end of the first heating unit so as to drive the first heating unit;
the control module is connected with the control end of the first driving unit to control the first heating unit to heat or stop heating.
3. The heating control circuit of the electromagnetic heating cooking device according to claim 2, wherein the first driving unit includes:
one end of the first resistor is connected with the control module;
a base electrode of the first switch tube is connected with the other end of the first resistor, and a collector electrode of the first switch tube is connected with a preset power supply;
one end of the second resistor is connected with the emitting electrode of the first switching tube;
one end of the third resistor and the other end of the second resistor are grounded, the other end of the third resistor is grounded, and a first node is arranged between the second resistor and the third resistor;
and the base electrode of the second switch tube is connected with the first node, the collector electrode of the second switch tube is connected with the other end of the first heating unit, and the emitting electrode of the second switch tube is grounded.
4. The heating control circuit of the electromagnetic heating cooking device according to claim 2, wherein the auxiliary heating module further comprises:
one end of the second heating unit is connected with the output end of the rectifying module and one end of the first heating unit respectively;
the second driving unit is connected with the other end of the second heating unit so as to drive the second heating unit;
the control module is connected with the control end of the second driving unit to control the second heating unit to heat or stop heating.
5. The heating control circuit of the electromagnetic heating cooking device according to claim 4, wherein the second driving unit includes:
one end of the fourth resistor is connected with the control module;
a base electrode of the third switching tube is connected with the other end of the fourth resistor, and a collector electrode of the third switching tube is connected with a preset power supply;
one end of the fifth resistor is connected with an emitting electrode of the third switching tube;
one end of the sixth resistor and the other end of the fifth resistor are grounded, the other end of the sixth resistor is grounded, and a second node is arranged between the fifth resistor and the sixth resistor;
and the base electrode of the fourth switching tube is connected with the second node, the collector electrode of the fourth switching tube is connected with the other end of the second heating unit, and the emitting electrode of the fourth switching tube is grounded.
6. The heating control circuit of the electromagnetic heating cooking device according to claim 4, wherein the first heating unit is disposed on a top of the electromagnetic heating cooking device, and the second heating unit is disposed on a side wall of the electromagnetic heating cooking device.
7. The heating control circuit of the electromagnetic heating cooking device according to claim 4, wherein the first heating unit and the second heating unit are both heating resistance wires.
8. The heating control circuit of the electromagnetic heating cooking device according to claim 1, wherein the first zero-cross point and the second zero-cross point are located in a same half-wave period of the alternating current.
9. An electromagnetic heating cooking device characterized by comprising the heating control circuit of the electromagnetic heating cooking device according to any one of claims 1 to 8.
10. A control method of a heating control circuit of an electromagnetic heating cooking apparatus according to any one of claims 1 to 8, characterized by comprising the steps of:
detecting a zero crossing point of an alternating current power supply to generate a zero crossing signal;
and after the auxiliary heating module is controlled to perform heating and discharging work according to a first zero-crossing point in the zero-crossing signal, a driving control signal is output to the driving module according to a second zero-crossing point in the zero-crossing signal so as to control the main resonant heating module to perform heating work.
11. The control method of the heating control circuit of the electromagnetic heating cooking apparatus according to claim 10, wherein the first zero-cross point and the second zero-cross point are located within a same half-wave period of the alternating current supplied from the alternating current power supply.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107820341A (en) * | 2017-10-16 | 2018-03-20 | 赵玉奎 | Realize the circuit of IH electromagnetism laser heatings |
| CN109392207B (en) * | 2018-07-26 | 2024-03-19 | 浙江绍兴苏泊尔生活电器有限公司 | Electromagnetic heating circuit, electromagnetic heating appliance and zero-crossing detection method |
| CN110300470A (en) * | 2019-06-24 | 2019-10-01 | 深圳市驰创达科技有限公司 | Continuous low power IH heater circuit and its control method |
| CN110278622B (en) * | 2019-07-26 | 2024-04-12 | 广东韦奇伍德环保科技有限公司 | Control circuit for electromagnetic heating low-power continuous output |
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