CN108289350B - Electromagnetic heating control method and electromagnetic heating equipment - Google Patents
Electromagnetic heating control method and electromagnetic heating equipment Download PDFInfo
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- CN108289350B CN108289350B CN201710014630.8A CN201710014630A CN108289350B CN 108289350 B CN108289350 B CN 108289350B CN 201710014630 A CN201710014630 A CN 201710014630A CN 108289350 B CN108289350 B CN 108289350B
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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
Abstract
The invention discloses an electromagnetic heating control method and electromagnetic heating equipment, wherein the electromagnetic heating control method comprises the following steps: the method comprises the steps that in the heating process of electromagnetic heating equipment, the drain voltage of an IGBT tube and the actual power of the electromagnetic heating equipment are obtained; adjusting the turn-on target time of the IGBT tube according to the obtained drain voltage of the IGBT tube and the actual power of the electromagnetic heating equipment; and controlling the electromagnetic heating equipment according to the current switching-on target time of the IGBT tube so as to enable the actual switching-on time of the IGBT tube to approach the current switching-on target time of the IGBT tube. The electromagnetic heating control method can effectively control the drain voltage of the IGBT in the control circuit in the electromagnetic heating equipment, and avoids the phenomenon of overhigh drain voltage of the IGBT, thereby effectively improving the reliability of the electromagnetic heating equipment.
Description
Technical Field
The invention relates to the field of electromagnetic heating equipment, in particular to an electromagnetic heating control method and electromagnetic heating equipment.
Background
In the prior art, when electromagnetic heating equipment (such as an induction cooker and the like) carries out high-power heating, the drain voltage of an IGBT in a control circuit of the electromagnetic heating equipment is easy to generate a phenomenon of high voltage, and when the drain voltage of the IGBT is too high, the reliability of the electromagnetic heating equipment is seriously influenced, and the problem of potential safety hazard exists. In order to solve the above potential safety hazard problem of the electromagnetic heating device, in the prior art, a zero-crossing detection circuit is usually added in a control circuit of the electromagnetic heating device, a main control chip of the electromagnetic heating device judges an envelope valley bottom of a drain voltage waveform of the IGBT according to a detection result of the zero-crossing detection circuit on a zero-crossing point of the drain voltage of the IGBT, and then controls the drain voltage of the IGBT according to valley bottom calculation time, so that a peak value of the drain voltage of the IGBT does not exceed a preset threshold value. However, the control scheme of the drain voltage of the IGBT in the related art is not highly reliable.
Disclosure of Invention
The invention mainly aims to provide an electromagnetic heating control method, which aims to effectively control the drain voltage of an IGBT (insulated gate bipolar transistor) in electromagnetic heating equipment and improve the reliability of the electromagnetic heating equipment.
In order to achieve the above object, the present invention provides an electromagnetic heating control method including the steps of:
s1, acquiring drain voltage of an IGBT tube and actual power of the electromagnetic heating equipment in the heating process of the electromagnetic heating equipment;
s2, adjusting the turn-on target time of the IGBT tube according to the obtained drain voltage of the IGBT tube and the actual power of the electromagnetic heating equipment;
and S3, controlling the electromagnetic heating equipment according to the current opening target time of the IGBT tube so as to enable the actual opening time of the IGBT tube to approach the current opening target time of the IGBT tube.
Preferably, the drain voltage of the IGBT tube is a voltage signal value obtained by stepping down the drain voltage of the IGBT tube.
Preferably, the step S2 includes:
s21, when the drain voltage of the IGBT tube is larger than or equal to the corresponding preset threshold value under the current target power, reducing the turn-on target time of the IGBT tube;
and S22, comparing the actual power of the electromagnetic heating equipment with the current target power, and adjusting the opening target time of the IGBT tube according to the comparison result.
Preferably, the step S2 further includes:
s23, when the drain voltage of the IGBT tube is smaller than the corresponding preset threshold value under the current target power, executing the step S22.
Preferably, between the step S2 and the step S3, further comprising:
s4, judging whether the adjusted opening target time of the IGBT tube exceeds a preset time range; the preset time range is a switching-on target time range corresponding to a time period of the current time point in the resonance period of the IGBT tube; if yes, go to step S5; if not, go to step S3;
s5, taking the maximum value or the minimum value in the preset time range as the new opening target time of the IGBT tube, and executing the step S3.
Preferably, the step S4 is preceded by:
s41, starting timing when the drain voltage of the IGBT tube is larger than or equal to a corresponding preset threshold value under the current target power, and dividing each resonance period of the IGBT tube into a plurality of time periods;
and S42, determining the time period of the current time point in the resonance period of the IGBT according to the resonance period of the IGBT and the current timing time.
Preferably, the step S3 includes:
s31, judging whether the actual opening time of the IGBT tube approaches the current opening target time of the IGBT tube every other preset time period;
s32, when the actual opening time of the IGBT tube does not approach the current opening target time of the IGBT tube, adjusting the actual opening time of the IGBT tube;
and S33, when the actual opening time of the IGBT tube approaches the current opening target time of the IGBT tube, no processing is performed.
In addition, in order to achieve the above object, the present invention further provides an electromagnetic heating device, which includes an electromagnetic heating control circuit, wherein the electromagnetic heating control circuit includes an electromagnetic heating circuit unit, a voltage reduction circuit unit, a voltage and current sampling circuit unit and a main control chip, and the electromagnetic heating circuit unit includes an IGBT tube; wherein:
the voltage reduction circuit unit is used for reducing the voltage of the drain electrode of the IGBT tube in the heating process of the electromagnetic heating equipment, and reducing the voltage of the drain electrode of the IGBT tube into a voltage signal value which can be identified by the main control chip;
the voltage and current sampling circuit unit is used for sampling the input voltage and the total current of the electromagnetic heating control circuit in the heating process of the electromagnetic heating equipment;
the main control chip is used for acquiring the drain voltage of the IGBT tube during the heating process of the electromagnetic heating equipment, and acquiring the actual power of the electromagnetic heating equipment according to the input voltage and the total current sampled by the voltage and current sampling circuit unit; the voltage of the drain electrode of the IGBT tube is a voltage signal value after being reduced by the voltage reduction circuit unit; meanwhile, the opening target time of the IGBT tube is adjusted according to the obtained drain voltage of the IGBT tube and the actual power of the electromagnetic heating equipment, and the electromagnetic heating equipment is controlled according to the current opening target time of the IGBT tube, so that the actual opening time of the IGBT tube approaches the current opening target time of the IGBT tube.
Preferably, the main control chip is specifically configured to:
when the drain voltage of the IGBT tube is larger than or equal to a corresponding preset threshold value under the current target power, reducing the turn-on target time of the IGBT tube; and comparing the actual power of the electromagnetic heating equipment with a preset target power, and adjusting the turn-on target time of the IGBT tube according to the comparison result.
Preferably, the main control chip is further configured to:
and when the drain voltage of the IGBT tube is smaller than a corresponding preset threshold value under the current target power, comparing the actual power of the electromagnetic heating equipment with the preset target power, and adjusting the turn-on target time of the IGBT tube according to the comparison result.
Preferably, the main control chip is further configured to:
judging whether the adjusted opening target time of the IGBT tube exceeds a preset time range or not; the preset time range is a switching-on target time range corresponding to a time period of the current time point in the resonance period of the IGBT tube;
if so, taking the maximum value or the minimum value in the preset time range as the new opening target time of the IGBT tube, and controlling the electromagnetic heating equipment according to the current opening target time of the IGBT tube so as to enable the actual opening time of the IGBT tube to approach the current opening target time of the IGBT tube;
if not, controlling the electromagnetic heating equipment according to the current opening target time of the IGBT tube so as to enable the actual opening time of the IGBT tube to approach the current opening target time of the IGBT tube;
preferably, the main control chip is further configured to:
starting timing when the drain voltage of the IGBT tube is greater than or equal to a corresponding preset threshold value under the current target power, and dividing each resonance period of the IGBT tube into a plurality of time periods;
and determining the time period of the current time point in the resonance period of the IGBT tube according to the resonance period of the IGBT tube and the current timing time.
Preferably, the main control chip is further configured to:
judging whether the actual opening time of the IGBT tube approaches the current opening target time of the IGBT tube or not at intervals of a preset time period; when the actual opening time of the IGBT tube does not approach the current opening target time of the IGBT tube, adjusting the actual opening time of the IGBT tube; and when the actual opening time of the IGBT tube approaches the current opening target time of the IGBT tube, no processing is carried out.
The invention provides an electromagnetic heating control method, wherein in the heating process of electromagnetic heating equipment, the drain voltage of an IGBT tube and the actual power of the electromagnetic heating equipment are obtained; adjusting the turn-on target time of the IGBT tube according to the obtained drain voltage of the IGBT tube and the actual power of the electromagnetic heating equipment; and controlling the electromagnetic heating equipment according to the current switching-on target time of the IGBT tube so as to enable the actual switching-on time of the IGBT tube to approach the current switching-on target time of the IGBT tube. The electromagnetic heating control method can effectively control the drain voltage of the IGBT in the control circuit in the electromagnetic heating equipment, and avoids the phenomenon of overhigh drain voltage of the IGBT, thereby effectively improving the reliability of the electromagnetic heating equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a first embodiment of an electromagnetic heating control method according to the present invention;
FIG. 2 is a schematic flow chart of a second embodiment of the electromagnetic heating control method of the present invention;
FIG. 3 is a schematic flow chart of a third embodiment of the electromagnetic heating control method of the present invention;
FIG. 4 is a schematic flow chart of a fourth embodiment of the electromagnetic heating control method of the present invention;
FIG. 5 is a schematic flow chart of a fifth embodiment of the electromagnetic heating control method of the present invention;
FIG. 6 is a schematic diagram of a resonant voltage waveform of an IGBT tube according to an embodiment of the electromagnetic heating control method of the present invention;
fig. 7 is a schematic circuit structure diagram of an electromagnetic heating control circuit in the electromagnetic heating apparatus of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The present invention provides an electromagnetic heating control method, referring to fig. 1, in an embodiment, the electromagnetic heating control method includes the following steps:
step S1, acquiring drain voltage of an IGBT tube and actual power of electromagnetic heating equipment by the electromagnetic heating equipment in the heating process;
the electromagnetic heating control method provided by the embodiment of the invention is mainly applied to a control system of electromagnetic heating equipment (such as an induction cooker) and is used for effectively controlling the drain voltage of the IGBT in a control circuit in the electromagnetic heating equipment so as to avoid the problem that the reliability of the electromagnetic heating equipment is influenced due to overhigh drain voltage of the IGBT.
In the electromagnetic heating control method, in order to effectively control the drain voltage of the IGBT in the control circuit of the electromagnetic heating device, the electromagnetic heating control method of this embodiment first obtains the drain voltage of the IGBT tube and the actual power of the electromagnetic heating device during the heating process of the electromagnetic heating device. In the following embodiments, the drain voltage of the IGBT is a voltage signal value obtained by stepping down the drain voltage of the IGBT (the stepped-down voltage signal is a small voltage signal recognizable by a main control chip in the electromagnetic heating device).
Step S2, adjusting the opening target time of the IGBT tube according to the obtained drain voltage of the IGBT tube and the actual power of the electromagnetic heating equipment;
specifically, after the drain voltage of the IGBT and the actual power of the electromagnetic heating device are obtained, the electromagnetic heating control method of this embodiment adjusts the turn-on target time of the IGBT according to the obtained drain voltage of the IGBT and the actual power of the electromagnetic heating device. That is, in this embodiment, the on-target time of the IGBT tube is a dynamic value that is dynamically adjusted according to the change of the drain voltage of the IGBT tube and the change of the actual power of the electromagnetic heating device.
And step S3, controlling the electromagnetic heating equipment according to the current opening target time of the IGBT tube so as to enable the actual opening time of the IGBT tube to approach the current opening target time of the IGBT tube.
In this embodiment, after the turn-on target time of the IGBT tube is adjusted according to the obtained drain voltage of the IGBT tube and the actual power of the electromagnetic heating device, the electrothermal heating operation of the electromagnetic heating device is controlled according to the current turn-on target time of the IGBT tube, so that the actual turn-on time of the IGBT in the control circuit in the electromagnetic heating device approaches the current turn-on target time of the IGBT tube.
According to the electromagnetic heating control method, firstly, in the heating process of the electromagnetic heating equipment, the drain voltage of an IGBT tube and the actual power of the electromagnetic heating equipment are obtained. The drain voltage of the IGBT tube is a voltage signal value obtained by reducing the drain voltage of the IGBT tube; then, adjusting the turn-on target time of the IGBT tube according to the obtained drain voltage of the IGBT tube and the actual power of the electromagnetic heating equipment; and then, controlling the electromagnetic heating equipment according to the current switching-on target time of the IGBT tube so as to enable the actual switching-on time of the IGBT tube to approach the current switching-on target time of the IGBT tube. The electromagnetic heating control method provided by the embodiment of the invention can effectively control the drain voltage of the IGBT tube in the control circuit in the electromagnetic heating equipment, and avoids the phenomenon of overhigh drain voltage of the IGBT tube, thereby effectively improving the reliability of the electromagnetic heating equipment.
Further, referring to fig. 2, based on the first embodiment of the electromagnetic heating control method of the present invention, in the second embodiment of the electromagnetic heating control method of the present invention, the step S2 described above includes:
step S21, when the drain voltage of the IGBT tube is larger than or equal to the corresponding preset threshold value under the current target power, reducing the opening target time of the IGBT tube;
step S22, comparing the actual power of the electromagnetic heating equipment with the current target power, and adjusting the opening target time of the IGBT tube according to the comparison result;
step S23, when the drain voltage of the IGBT is smaller than the corresponding preset threshold under the current target power, step S22 is executed.
It is understood that, in this embodiment, the electromagnetic heating device corresponds to a preset threshold of the drain voltage of an IGBT tube at each target power, for example, when the electromagnetic heating device in this embodiment is an electromagnetic oven, when the current target power of the electromagnetic oven is 1950W, the preset threshold corresponding to the drain voltage of the IGBT tube when the current target power is 1950W is 1080V. Therefore, in this embodiment, if the current target power of the induction cooker is 1950W, when the drain voltage of the IGBT tube is detected to be greater than or equal to 1080V, the turn-on target time of the IGBT tube needs to be reduced.
In addition, in this embodiment, since the actual power of the electromagnetic heating device is reduced after the actual on-time of the IGBT is reduced, in this embodiment, when the drain voltage of the IGBT is greater than or equal to the preset threshold corresponding to the current target power, after the on-target time of the IGBT is reduced, the actual power of the electromagnetic heating device needs to be compared with the current target power, and the on-target time of the IGBT is adjusted according to the comparison result.
Specifically, in this embodiment, when the actual power of the electromagnetic heating device is smaller than the current target power, the turn-on target time of the IGBT tube is increased; when the actual power of the electromagnetic heating equipment is larger than the current target power, reducing the turn-on target time of the IGBT tube; when the actual power of the electromagnetic heating equipment is equal to the current target power, the switching-on target time of the IGBT tube is not changed.
In this embodiment, when the drain voltage of the GBT tube is smaller than the corresponding preset threshold value under the current target power, the actual power of the electromagnetic heating device is compared with the current target power, and the on-target time of the IGBT tube is adjusted according to the comparison result, so that the electromagnetic heating device performs electromagnetic heating operation according to the current target power.
In the electromagnetic heating control method, when the drain voltage of the IGBT is greater than or equal to the corresponding preset threshold value under the current target power, the turn-on target time of the IGBT is reduced; and after the opening target time of the IGBT tube is adjusted, comparing the actual power of the electromagnetic heating equipment with the current target power, and adjusting the opening target time of the IGBT tube according to the comparison result. According to the embodiment, when the drain voltage of the IGBT tube is larger than or equal to the corresponding preset threshold value under the current target power, the turn-on target time of the IGBT tube is reduced, so that the drain voltage of the IGBT tube is effectively controlled, the phenomenon that the drain voltage of the IGBT tube is too high is avoided, and the reliability of the electromagnetic heating equipment is effectively improved.
Further, referring to fig. 3, in a third embodiment of the electromagnetic heating control method of the present invention, based on the second embodiment of the electromagnetic heating control method of the present invention, the step between the step S2 and the step S3 further includes:
s4, judging whether the adjusted opening target time of the IGBT tube exceeds a preset time range; the preset time range is a switching-on target time range corresponding to a time period of the current time point in the resonance period of the IGBT tube; if yes, go to step S5; if not, go to step S3;
s5, taking the maximum value or the minimum value in the preset time range as the new opening target time of the IGBT tube, and executing the step S3.
Specifically, in this embodiment, after the turning-on target time of the IGBT tube is adjusted (i.e., after step S2 described above), it needs to be determined whether the adjusted turning-on target time of the IGBT tube exceeds a preset time range, where the preset time range is a turning-on target time range corresponding to a time period in which the current time point is located in the resonance period of the IGBT tube. When the adjusted opening target time of the IGBT tube exceeds the preset time range, taking the maximum value or the minimum value in the preset time range as the new opening target time of the IGBT tube, and controlling the electromagnetic heating equipment according to the current opening target time of the IGBT tube so as to enable the actual opening time of the IGBT tube to approach the current opening target time of the IGBT tube; and when the adjusted opening target time of the IGBT tube does not exceed the preset time range, controlling the electromagnetic heating equipment according to the current opening target time of the IGBT tube so as to enable the actual opening time of the IGBT tube to approach the current opening target time of the IGBT tube. The electromagnetic heating control method can effectively control the drain voltage of the IGBT tube, and avoids the phenomenon that the drain voltage of the IGBT tube is too high, so that the reliability of the electromagnetic heating equipment is effectively improved.
Further, referring to fig. 4, in a fourth embodiment of the electromagnetic heating control method of the present invention, based on the third embodiment of the electromagnetic heating control method of the present invention, before the step S4, the method further includes:
s41, timing is started when the drain voltage of the IGBT tube is larger than or equal to a corresponding preset threshold value under the current target power, and each resonance period of the IGBT tube is divided into a plurality of time periods;
and S42, determining the time period of the current time point in the resonance period of the IGBT tube according to the resonance period of the IGBT tube and the current timing time.
Specifically, in this embodiment, timing is started at the moment when the drain voltage of the IGBT is greater than or equal to the preset threshold corresponding to the current target power, and each resonance cycle of the IGBT is divided into a plurality of time periods. It should be noted that, in this embodiment, the timing is started at the moment when the drain voltage of the IGBT is greater than or equal to the preset threshold corresponding to the current target power, in other embodiments, the timing may be started at other moments of the resonance period, and the timing of starting the timing is not fixed. In addition, in this embodiment, the preset threshold is independent of the power of the electromagnetic heating device.
Referring to fig. 6, fig. 6 is a schematic diagram of a resonance voltage waveform of an IGBT tube in an embodiment of the electromagnetic heating control method of the present invention, as shown in fig. 6, this embodiment divides each resonance period in the resonance voltage waveform of the IGBT tube into four time periods, which are respectively a 0-T1 time period, a T1-T2 time period, a T2-T3 time period, and a T3-T4 time period, and then determines a time period in which a current time point is located in the resonance period of the IGBT tube according to the resonance period T of the IGBT tube and a current timing time T1. In this embodiment, the resonance period T of the IGBT is 10 ms. In addition, in this embodiment, the time nodes T1, T2, T3, and T4 may be set according to actual needs, and preferably, in this embodiment, the time node T1 is at 1/6T, the time node T2 is at 2/6T, the time node T3 is at 4/6T, and the time node T5 is at 5/6T, and each time period corresponds to a preset target turn-on time range of the IGBT.
For example, in this embodiment, when the timer time is 23ms, it may be determined that a time period in which the current time point is located in the resonance period of the IGBT tube is within a time period from T1 to T2 in fig. 6, where the adjusted turn-on target time of the IGBT tube cannot exceed the turn-on target time range corresponding to the time period, according to the resonance period T (T is 10ms) of the IGBT tube and the current timer time T1(T1 is 23 ms). When the adjusted opening target time of the IGBT tube exceeds the opening target time range corresponding to the time period, the maximum value or the minimum value in the preset time range is used as the new opening target time of the IGBT tube, and the electromagnetic heating work of the electromagnetic heating equipment is controlled according to the current opening target time of the IGBT tube, so that the actual opening time of the IGBT tube approaches the current opening target time of the IGBT tube.
Specifically, in this embodiment, if the adjusted turn-on target time of the IGBT exceeds the maximum value of the turn-on target time range corresponding to the time period, the preset maximum value of the turn-on target time range corresponding to the time period is used as the new turn-on target time of the IGBT;
and if the adjusted opening target time of the IGBT is smaller than the minimum value of the opening target time range corresponding to the time period, taking the preset minimum value of the opening target time range corresponding to the time period as the new opening target time of the IGBT.
And if the adjusted opening target time of the IGBT tube does not exceed the opening target time range corresponding to the time period, controlling the electromagnetic heating work of the electromagnetic heating equipment according to the current opening target time of the IGBT tube so as to enable the actual opening time of the IGBT tube to approach the current opening target time of the IGBT tube.
According to the electromagnetic heating control method, after the opening target time of the IGBT tube is adjusted, whether the adjusted opening target time of the IGBT tube exceeds a preset time range is judged, the preset time range is the opening target time range corresponding to the time period of the current time point in the resonance period of the IGBT tube, and if the adjusted opening target time of the IGBT tube exceeds the preset time range, the maximum value or the minimum value in the preset time range is used as the new opening target time of the IGBT tube. According to the embodiment, the drain voltage of the IGBT tube can be effectively controlled, the phenomenon that the drain voltage of the IGBT tube is too high is avoided, and therefore the reliability of the electromagnetic heating equipment is effectively improved.
Further, referring to fig. 5, in a fifth embodiment of the electromagnetic heating control method of the present invention, based on any one of the above-described embodiments of the electromagnetic heating control method of the present invention, the step S3 includes:
s31, judging whether the actual opening time of the IGBT tube approaches the current opening target time of the IGBT tube every other preset time period;
s32, when the actual opening time of the IGBT tube does not approach the current opening target time of the IGBT tube, adjusting the actual opening time of the IGBT tube;
and S33, when the actual opening time of the IGBT tube approaches the current opening target time of the IGBT tube, no processing is performed.
The electromagnetic heating control method provided by the embodiment of the invention judges whether the actual opening time of the IGBT tube approaches the current opening target time of the IGBT tube or not at intervals of a preset time period, and when the actual opening time of the IGBT tube does not approach the current opening target time of the IGBT tube, the actual opening time of the IGBT tube is adjusted to enable the actual opening time of the IGBT tube to approach the current opening target time of the IGBT tube; and when the actual opening time of the IGBT tube approaches the current opening target time of the IGBT tube, no processing is carried out. According to the embodiment, the drain voltage of the IGBT tube can be effectively controlled, the phenomenon that the drain voltage of the IGBT tube is too high is avoided, and therefore the reliability of the electromagnetic heating equipment is effectively improved.
Referring to fig. 7, in an embodiment, the electromagnetic heating apparatus includes an electromagnetic heating control circuit, where the electromagnetic heating control circuit includes a mains power input terminal 101, an input protection circuit unit 102, a rectification filter circuit unit 103, an electromagnetic heating circuit unit 104, a voltage reduction circuit unit 105, a voltage and current sampling circuit unit 106, a driving circuit unit 107, and a main control chip 108.
Specifically, in this embodiment, the commercial power input end 101 is configured to input a commercial power and supply power to the electromagnetic heating device of this embodiment;
the input protection circuit unit 102 is configured to perform overvoltage protection and overcurrent protection on the electromagnetic heating device of this embodiment;
the rectification filter circuit unit 103 is configured to perform rectification filtering on the mains power input by the mains power input terminal 101, and output the rectified and filtered power to the electromagnetic heating circuit unit 104, so that the electromagnetic heating circuit unit 104 performs electromagnetic heating on a heated device (not shown);
the voltage reduction circuit unit 105 is used for reducing the drain voltage of the IGBT Q1;
the voltage and current sampling circuit unit 106 is configured to sample an input voltage of the electromagnetic heating control circuit (i.e., a mains voltage input by the mains power input terminal 101) and a total current of the electromagnetic heating control circuit;
the driving circuit unit 107 is configured to drive the electromagnetic heating operation of the electromagnetic heating circuit unit 104;
the main control chip 108 is configured to obtain a drain voltage of the IGBT Q1 during a heating process of the electromagnetic heating device, and obtain an actual power of the electromagnetic heating device according to the mains voltage and the total current sampled by the voltage and current sampling circuit unit; the drain voltage of the IGBT tube Q1 is a voltage signal value after being reduced by the voltage reduction circuit unit; meanwhile, the on-target time of the IGBT tube Q1 is adjusted according to the acquired drain voltage of the IGBT tube Q1 and the actual power of the electromagnetic heating equipment, and the electromagnetic heating equipment is controlled according to the current on-target time of the IGBT tube Q1, so that the actual on-time of the IGBT approaches the current on-target time of the IGBT tube Q1.
In this embodiment, the input protection circuit unit 102 includes a FUSE, a voltage dependent resistor R1, and a filter capacitor C1. Specifically, the FUSE is connected in series to a live line input end ACL of the mains power input end 101; one end of the piezoresistor R1 is connected with a live wire input end ACL of the mains supply input end 101, and the other end of the piezoresistor R1 is connected with a zero line input end ACN of the mains supply input end 101; the filter capacitor C1 is connected in parallel with the piezoresistor R1.
In this embodiment, the rectifier filter circuit unit 103 includes a rectifier bridge stack 1031, a capacitor C2, a capacitor C3, and an inductor L1. Specifically, a first AC input end AC1 of the rectifier bridge stack 1031 is connected to the live input end ACL, a second AC input end AC2 of the rectifier bridge stack 1031 is connected to the neutral input end ACN, a positive output end V + of the rectifier bridge stack 1031 is connected to the first end of the capacitor C2 and the first end of the inductor L1, respectively, and a negative output end V-of the rectifier bridge stack 1031 is connected to the second end of the capacitor C2; the second segment of the inductor L1 is connected with the first end of the capacitor C3; the second end of the capacitor C3 is grounded; a sampling resistor R2 for current sampling is also connected in series between the second end of the capacitor C2 and the second end of the capacitor C3; in this embodiment, the first end of the capacitor C3 is further connected to the electromagnetic heating circuit unit 104, and the second end of the capacitor C3 is further connected to ground.
In this embodiment, the electromagnetic heating circuit unit 104 includes a coil panel L2, a capacitor C4, and an IGBT tube Q1 for controlling on/off of current of the coil panel L2 to achieve electromagnetic heating. Specifically, a first end of the capacitor C4 is connected to a first end of the capacitor C3 and a first end of the coil panel L2, respectively (the specific connection relationship of the coil panel L2 is not shown), and a second end of the capacitor C4 is connected to a second end of the coil panel L2 and a drain of the IGBT tube Q1, respectively; the gate of the IGBT Q1 is connected to the main control chip 108 via the driving circuit unit 107, and the source of the IGBT Q1 is grounded.
In this embodiment, the input end of the voltage-reducing circuit unit 105 is connected to the drain of the IGBT Q1, and the output end of the voltage-reducing circuit unit 105 is connected to the main control chip; the input end of the driving circuit unit 107 is connected with the main control chip, and the output end of the driving circuit unit 107 is connected with the gate of the IGBT tube Q1; a first sampling input terminal of the voltage and current sampling circuit unit 106 is connected to the live wire input terminal ACL, and a second sampling input terminal of the voltage and current sampling circuit unit 106 is connected to one end of the sampling resistor R2.
In this embodiment, before the main control chip 108 obtains the drain voltage of the IGBT Q1, the voltage reduction circuit unit 105 needs to reduce the drain voltage of the IGBT Q1, and the voltage reduction circuit unit 105 reduces the drain voltage of the IGBT Q1 to a voltage signal value that can be recognized by the main control chip 105.
In this embodiment, the on-target time of the IGBT Q1 is a dynamic value that is dynamically adjusted according to the change of the drain voltage of the IGBT Q1 and the change of the actual power of the electromagnetic heating device.
In addition, in this embodiment, after the main control chip 105 adjusts the on-target time of the IGBT Q1 according to the drain voltage of the IGBT Q1 and the actual power of the electromagnetic heating device, the main control chip controls the electrothermal heating operation of the electromagnetic heating device according to the current on-target time of the IGBT Q1, so that the actual on-time of the IGBT in the control circuit of the electromagnetic heating device approaches the current on-target time of the IGBT Q1.
Further, in this embodiment, the main control chip 105 is specifically configured to: when the drain voltage of the IGBT tube Q1 is larger than or equal to a corresponding preset threshold value under the current target power, reducing the turn-on target time of the IGBT tube Q1; and then comparing the actual power of the electromagnetic heating equipment with the current target power, and adjusting the turn-on target time of the IGBT tube Q1 according to the comparison result.
It is understood that in the present embodiment, the electromagnetic heating device corresponds to a preset threshold of the drain voltage of the IGBT Q1 at each target power, for example, when the electromagnetic heating device in the present embodiment is an electromagnetic oven, the preset threshold corresponding to the drain voltage of the IGBT Q1 at the current target power 1950W is 1080V when the current target power of the electromagnetic oven is 1950W. Therefore, in this embodiment, if the current target power of the induction cooker is 1950W, when the drain voltage of the IGBT Q1 is detected to be greater than or equal to 1080V, the main control chip 105 needs to reduce the on-target time of the IGBT Q1.
In addition, in this embodiment, since the actual power of the electromagnetic heating device is reduced after the actual on-time of the IGBT Q1 is reduced, in this embodiment, when the drain voltage of the IGBT Q1 is greater than or equal to the preset threshold corresponding to the current target power, the main control chip 105 needs to compare the actual power of the electromagnetic heating device with the current target power after reducing the on-target time of the IGBT Q1, and adjust the on-target time of the IGBT Q1 according to the comparison result.
Specifically, in this embodiment, when the actual power of the electromagnetic heating device is smaller than the current target power, the on-target time of the IGBT Q1 is increased; when the actual power of the electromagnetic heating equipment is larger than the current target power, reducing the turn-on target time of the IGBT tube Q1; when the actual power of the electromagnetic heating device is equal to the current target power, the turn-on target time of the IGBT Q1 is not changed.
Further, in this embodiment, the main control chip 105 is further configured to: when the drain voltage of the IGBT tube Q1 is smaller than the corresponding preset threshold value under the current target power, comparing the actual power of the electromagnetic heating equipment with the preset target power, and adjusting the turn-on target time of the IGBT tube Q1 according to the comparison result.
Specifically, in the electromagnetic heating control method of this embodiment, when the main control chip 105 determines that the drain voltage of the GBT tube is smaller than the corresponding preset threshold value under the current target power, the actual power of the electromagnetic heating device is compared with the current target power, and according to the comparison result, the on-target time of the IGBT Q1 is adjusted, so that the electromagnetic heating device performs the electromagnetic heating operation according to the current target power.
Further, in this embodiment, the main control chip 105 is further configured to: starting timing when the drain voltage of the IGBT tube Q1 is greater than or equal to a corresponding preset threshold value under the current target power, and dividing each resonance period of the IGBT tube Q1 into a plurality of time periods; and determining the time period of the current time point in the resonance period of the IGBT tube Q1 according to the resonance period of the IGBT tube Q1 and the current timing time.
In this embodiment, the main control chip 105 is further configured to: judging whether the adjusted opening target time of the IGBT tube Q1 exceeds a preset time range; the preset time range is a switching-on target time range corresponding to a time period of the current time point in the resonance period of the IGBT tube Q1; if so, taking the maximum value or the minimum value in the preset time range as the new opening target time of the IGBT tube Q1, and controlling the electromagnetic heating equipment according to the current opening target time of the IGBT tube Q1 so as to enable the actual opening time of the IGBT to approach the current opening target time of the IGBT tube Q1; if not, controlling the electromagnetic heating equipment according to the current switching-on target time of the IGBT tube Q1 so as to enable the actual switching-on time of the IGBT to approach the current switching-on target time of the IGBT tube Q1.
Specifically, in this embodiment, the main control chip 105 starts timing at the moment when the drain voltage of the IGBT Q1 is greater than or equal to the corresponding preset threshold under the current target power, and divides each resonance period of the IGBT Q1 into a plurality of time periods, referring to fig. 6, fig. 6 is a schematic diagram of a resonance voltage waveform of the IGBT in an embodiment of the electromagnetic heating control method of the present invention, as shown in fig. 6, in this embodiment, each resonance period of the resonance voltage waveform of the IGBT Q1 is divided into four time periods, which are 0-T1 time period, T1-T2 time period, T2-T3 time period, and T3-T4 time period, and then, according to the resonance period T of the IGBT Q1 and the current timing time T1, the time period of the current time point in the resonance period of the IGBT Q1 is determined. In this embodiment, the resonance period T of the IGBT Q1 is 10 ms. In addition, in this embodiment, the time nodes T1, T2, T3 and T4 may be set according to actual needs, and preferably, in this embodiment, the time node T1 is at 1/6T, the time node T2 is at 2/6T, the time node T3 is at 4/6T, and the time node T5 is at 5/6T, and each time period corresponds to a preset turn-on target time range of the IGBT Q1.
After the electromagnetic heating device of this embodiment adjusts the on-target time of IGBT Q1, it needs to determine whether the adjusted on-target time of IGBT Q1 exceeds a preset time range, where the preset time range is the on-target time range corresponding to the time period in which the current time point is located in the resonance cycle of IGBT Q1. For example, when the timer time is 23ms, it may be determined from the resonant period T (T ═ 10ms) of the IGBT transistor Q1 and the current timer time T1(T1 ═ 23ms) that the current time point is in the resonant period of the IGBT transistor Q1 within the time period T1-T2 in fig. 6, and the adjusted on-target time of the IGBT transistor Q1 cannot exceed the on-target time range corresponding to the time period. When the adjusted switching-on target time of the IGBT tube Q1 exceeds the switching-on target time range corresponding to the time period, the maximum value or the minimum value in the preset time range is used as the new switching-on target time of the IGBT tube Q1, and the electromagnetic heating work of the electromagnetic heating equipment is controlled according to the current switching-on target time of the IGBT tube Q1, so that the actual switching-on time of the IGBT approaches the current switching-on target time of the IGBT tube Q1.
Specifically, in this embodiment, if the adjusted turn-on target time of IGBT Q1 exceeds the maximum value of the turn-on target time range corresponding to the time period, the preset maximum value of the turn-on target time range corresponding to the time period is used as the new turn-on target time of IGBT Q1; if the adjusted turn-on target time of IGBT Q1 is smaller than the minimum value of the turn-on target time range corresponding to the time period, the preset minimum value of the turn-on target time range corresponding to the time period is used as the new turn-on target time of IGBT Q1. And if the adjusted opening target time of the IGBT tube Q1 does not exceed the opening target time range corresponding to the time period, controlling the electromagnetic heating work of the electromagnetic heating equipment according to the current opening target time of the IGBT tube Q1 so as to enable the actual opening time of the IGBT to approach the current opening target time of the IGBT tube Q1.
Further, in this embodiment, the main control chip 105 is further configured to:
judging whether the actual turn-on time of the IGBT tube Q1 approaches the current turn-on target time of the IGBT tube Q1 every other preset time period; when the actual on-time of the IGBT tube Q1 does not approach the current on-target time of the IGBT tube Q1, adjusting the actual on-time of the IGBT tube Q1; when the actual turn-on time of the IGBT tube Q1 approaches the current turn-on target time of the IGBT tube Q1, no processing is performed.
Firstly, in the heating process of the electromagnetic heating device, the voltage reduction circuit unit 105 reduces the drain voltage of the IGBT Q1, reduces the drain voltage of the IGBT Q1 to a voltage signal value that can be recognized by the main control chip 108, and simultaneously, the voltage and current sampling circuit unit 106 samples the mains voltage at the mains supply input end 101 and the total current of the electromagnetic heating control circuit; then, the main control chip 105 obtains the drain voltage of the IGBT Q1 stepped down by the step-down circuit unit 105 during the heating process of the electromagnetic heating device, and obtains the actual power of the electromagnetic heating device according to the mains voltage and the total current sampled by the voltage and current sampling circuit unit; meanwhile, the main control chip 105 adjusts the on-target time of the IGBT tube Q1 according to the obtained drain voltage of the IGBT tube Q1 and the actual power of the electromagnetic heating device, and controls the electromagnetic heating device according to the current on-target time of the IGBT tube Q1, so that the actual on-time of the IGBT approaches the current on-target time of the IGBT tube Q1. The electromagnetic heating equipment can effectively control the drain voltage of the IGBT in the control circuit in the electromagnetic heating equipment, and avoids the phenomenon that the drain voltage of the IGBT is too high, so that the reliability of the electromagnetic heating equipment is effectively improved; in addition, the electromagnetic heating device of the embodiment also has the advantages of simple structure and easy realization.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. An electromagnetic heating control method is characterized by comprising the following steps:
s1, acquiring drain voltage of an IGBT tube and actual power of the electromagnetic heating equipment in the heating process of the electromagnetic heating equipment;
s2, adjusting the turn-on target time of the IGBT tube according to the obtained drain voltage of the IGBT tube and the actual power of the electromagnetic heating equipment;
the step S2 includes:
s21, when the drain voltage of the IGBT tube is larger than or equal to the corresponding preset threshold value under the current target power, reducing the turn-on target time of the IGBT tube;
s22, comparing the actual power of the electromagnetic heating equipment with the current target power, and adjusting the opening target time of the IGBT tube according to the comparison result;
s23, when the drain voltage of the IGBT tube is smaller than the corresponding preset threshold value under the current target power, executing a step S22;
and S3, controlling the electromagnetic heating equipment according to the current opening target time of the IGBT tube so as to enable the actual opening time of the IGBT tube to approach the current opening target time of the IGBT tube.
2. The electromagnetic heating control method according to claim 1, wherein the drain voltage of the IGBT tube is a voltage signal value obtained by stepping down the drain voltage of the IGBT tube.
3. The electromagnetic heating control method of claim 1, further comprising, between step S2 and step S3:
s4, judging whether the adjusted opening target time of the IGBT tube exceeds a preset time range; the preset time range is a switching-on target time range corresponding to a time period of the current time point in the resonance period of the IGBT tube; if yes, go to step S5; if not, go to step S3;
s5, taking the maximum value or the minimum value in the preset time range as the new opening target time of the IGBT tube, and executing the step S3.
4. The electromagnetic heating control method according to claim 3, characterized by further comprising, before step S4:
s41, starting timing when the drain voltage of the IGBT tube is larger than or equal to a corresponding preset threshold value under the current target power, and dividing each resonance period of the IGBT tube into a plurality of time periods;
and S42, determining the time period of the current time point in the resonance period of the IGBT according to the resonance period of the IGBT and the current timing time.
5. The electromagnetic heating control method according to any one of claims 1 to 4, wherein the step S3 includes:
s31, judging whether the actual opening time of the IGBT tube approaches the current opening target time of the IGBT tube every other preset time period;
s32, when the actual opening time of the IGBT tube does not approach the current opening target time of the IGBT tube, adjusting the actual opening time of the IGBT tube;
and S33, when the actual opening time of the IGBT tube approaches the current opening target time of the IGBT tube, no processing is performed.
6. The electromagnetic heating equipment comprises an electromagnetic heating control circuit, and is characterized in that the electromagnetic heating control circuit comprises an electromagnetic heating circuit unit, a voltage reduction circuit unit, a voltage and current sampling circuit unit and a main control chip, wherein the electromagnetic heating circuit unit comprises an IGBT (insulated gate bipolar transistor) tube; wherein:
the voltage reduction circuit unit is used for reducing the voltage of the drain electrode of the IGBT tube in the heating process of the electromagnetic heating equipment, and reducing the voltage of the drain electrode of the IGBT tube into a voltage signal value which can be identified by the main control chip;
the voltage and current sampling circuit unit is used for sampling the input voltage and the total current of the electromagnetic heating control circuit in the heating process of the electromagnetic heating equipment;
the main control chip is used for acquiring the drain voltage of the IGBT tube during the heating process of the electromagnetic heating equipment, and acquiring the actual power of the electromagnetic heating equipment according to the input voltage and the total current sampled by the voltage and current sampling circuit unit; the voltage of the drain electrode of the IGBT tube is a voltage signal value after being reduced by the voltage reduction circuit unit; meanwhile, when the drain voltage of the IGBT tube is larger than or equal to a corresponding preset threshold value under the current target power, reducing the turn-on target time of the IGBT tube; comparing the actual power of the electromagnetic heating equipment with a preset target power, and adjusting the turn-on target time of the IGBT tube according to the comparison result; when the drain voltage of the IGBT tube is smaller than the corresponding preset threshold value under the current target power, comparing the actual power of the electromagnetic heating equipment with the preset target power, adjusting the opening target time of the IGBT tube according to the comparison result, and controlling the electromagnetic heating equipment according to the current opening target time of the IGBT tube so as to enable the actual opening time of the IGBT tube to approach the current opening target time of the IGBT tube.
7. The electromagnetic heating apparatus of claim 6, wherein the master control chip is further configured to:
judging whether the adjusted opening target time of the IGBT tube exceeds a preset time range or not; the preset time range is a switching-on target time range corresponding to a time period of the current time point in the resonance period of the IGBT tube;
if so, taking the maximum value or the minimum value in the preset time range as the new opening target time of the IGBT tube, and controlling the electromagnetic heating equipment according to the current opening target time of the IGBT tube so as to enable the actual opening time of the IGBT tube to approach the current opening target time of the IGBT tube;
if not, controlling the electromagnetic heating equipment according to the current opening target time of the IGBT tube so as to enable the actual opening time of the IGBT tube to approach the current opening target time of the IGBT tube.
8. The electromagnetic heating apparatus of claim 7, wherein the master control chip is further configured to:
starting timing when the drain voltage of the IGBT tube is greater than or equal to a corresponding preset threshold value under the current target power, and dividing each resonance period of the IGBT tube into a plurality of time periods;
and determining the time period of the current time point in the resonance period of the IGBT tube according to the resonance period of the IGBT tube and the current timing time.
9. The electromagnetic heating apparatus of any of claims 6 to 8, wherein the master control chip is further configured to:
judging whether the actual opening time of the IGBT tube approaches the current opening target time of the IGBT tube or not at intervals of a preset time period; when the actual opening time of the IGBT tube does not approach the current opening target time of the IGBT tube, adjusting the actual opening time of the IGBT tube; and when the actual opening time of the IGBT tube approaches the current opening target time of the IGBT tube, no processing is carried out.
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| CN201710014630.8A CN108289350B (en) | 2017-01-09 | 2017-01-09 | Electromagnetic heating control method and electromagnetic heating equipment |
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| CN201710014630.8A CN108289350B (en) | 2017-01-09 | 2017-01-09 | Electromagnetic heating control method and electromagnetic heating equipment |
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| CN109121240A (en) * | 2018-09-30 | 2019-01-01 | 珠海格力电器股份有限公司 | Cookware self-adaptive electromagnetic heating system, electromagnetic heater, method for heating and controlling |
| CN112770430B (en) * | 2019-10-21 | 2022-08-23 | 浙江绍兴苏泊尔生活电器有限公司 | EMC (electro magnetic compatibility) optimization method, electromagnetic heating circuit and electromagnetic heating appliance |
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