CN108811212B - Electromagnetic heating system, heating control method and heating control device thereof - Google Patents
Electromagnetic heating system, heating control method and heating control device thereof Download PDFInfo
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- CN108811212B CN108811212B CN201710301750.6A CN201710301750A CN108811212B CN 108811212 B CN108811212 B CN 108811212B CN 201710301750 A CN201710301750 A CN 201710301750A CN 108811212 B CN108811212 B CN 108811212B
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- 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
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Abstract
The invention discloses an electromagnetic heating system, a heating control method and a heating control device thereof, wherein the method comprises the following steps: acquiring a target duty ratio and acquiring a duty ratio adjusting mode; when the duty ratio is adjusted in a gradual change mode, the duty ratio of a control signal output to an IGBT tube is controlled to be gradually reduced from a preset duty ratio to a target duty ratio, the electromagnetic heating system is controlled to work according to the gradually reduced duty ratio, the duty ratio of the control signal is controlled to be kept at the target duty ratio after the control signal is reduced to the target duty ratio, and the electromagnetic heating system works according to the target duty ratio; in the working process of the electromagnetic heating system, the working current of the electromagnetic heating system is sampled in the heating period corresponding to the gradually-reduced duty ratio or the target duty ratio, and the heating power of the electromagnetic heating system is controlled according to the sampled working current. Therefore, a proper current value can be collected, and the phenomenon that the electromagnetic heating system is mistakenly judged to be without a pot due to the fact that the current is too small is prevented.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a heating control method of an electromagnetic heating system, a heating control device of the electromagnetic heating system and the electromagnetic heating system.
Background
The induction cooker in the related art generally realizes low power in a wave-dropping manner, that is, in the low power heating mode, low power heating is realized at a certain duty ratio. However, the related art has problems that heating power rises slowly and current sampling period is short during low-power heating, so that current sampling value is small during starting, and the phenomenon that the induction cooker is mistakenly judged as no pan due to too small current is easily caused.
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. Therefore, an object of the present invention is to provide a heating control method for an electromagnetic heating system, which can acquire a suitable current value to prevent the electromagnetic heating system from being mistakenly determined as no pot due to an excessively small current.
Another object of the present invention is to provide a heating control device for an electromagnetic heating system. It is a further object of the present invention to provide an electromagnetic heating system.
In order to achieve the above object, an embodiment of the present invention provides a heating control method for an electromagnetic heating system, including the following steps: acquiring the target duty ratio and acquiring a duty ratio adjusting mode, wherein the duty ratio adjusting mode comprises a gradual changing mode and a fixed mode; when the duty ratio is adjusted in a gradual change mode, firstly, the duty ratio of a control signal output to an IGBT tube in the electromagnetic heating system is controlled to be gradually reduced from a preset duty ratio to the target duty ratio, the electromagnetic heating system is controlled to work according to the gradually reduced duty ratio, after the duty ratio is reduced to the target duty ratio, the duty ratio of the control signal is controlled to be kept at the target duty ratio, and the electromagnetic heating system works according to the target duty ratio; and in the working process of the electromagnetic heating system, sampling the working current of the electromagnetic heating system in the heating period corresponding to the gradually-reduced duty ratio or the target duty ratio, and controlling the heating power of the electromagnetic heating system according to the sampled working current.
According to the heating control method of the electromagnetic heating system provided by the embodiment of the invention, when the duty ratio is adjusted in a gradual change mode, the duty ratio of the control signal is controlled to be gradually reduced from the preset duty ratio to the target duty ratio, the electromagnetic heating system is controlled to work according to the gradually reduced duty ratio, the duty ratio of the control signal is controlled to be kept at the target duty ratio after the control signal is reduced to the target duty ratio, the electromagnetic heating system works according to the target duty ratio, further, in the working process of the electromagnetic heating system, the working current of the electromagnetic heating system is sampled at the gradually reduced duty ratio or the heating period corresponding to the target duty ratio, and the heating power of the electromagnetic heating system is controlled according to the sampled working current. From this, through control duty cycle from presetting duty cycle and reducing to the target duty cycle gradually, can increase the current sampling number of times, increase power adjustment time to can improve heating power's rate of rise, the current sampling value lags behind the reduction, can gather suitable current value, prevent that electromagnetic heating system from appearing because of the phenomenon of current undersize mistake judgement as no pot, improve electromagnetic heating system low-power heating's stability, promote user's experience.
According to an embodiment of the present invention, the time for gradually decreasing from the preset duty ratio to the target duty ratio may be greater than or equal to 0.2 seconds and less than or equal to 10 seconds.
According to one embodiment of the invention, when the duty ratio is adjusted in a fixed manner, the duty ratio of the control signal is controlled to be directly adjusted to the target duty ratio, and the electromagnetic heating system works according to the target duty ratio; in the working process of the electromagnetic heating system, a heating end point of a heating period corresponding to the target duty ratio is obtained, a heating end interval is determined according to the heating end point, the working current of the electromagnetic heating system is sampled in the heating end interval, and the heating power of the electromagnetic heating system is controlled according to the sampled working current.
Therefore, the current is sampled in the heating ending interval, a larger current value can be acquired, and meanwhile, the interference caused by the turn-on of the IGBT in the electromagnetic heating system is eliminated to the maximum limit, so that the phenomenon that the electromagnetic heating system is mistakenly judged to be pan-free due to the over-small current is prevented, the low-power heating stability of the electromagnetic heating system is improved, and the user experience is improved.
According to an embodiment of the present invention, the heating end interval may be less than or equal to 8 milliseconds.
According to one embodiment of the invention, the target duty cycle may be in units of a half-wave period of the mains.
In order to achieve the above object, a heating control device of an electromagnetic heating system according to another embodiment of the present invention includes: the current sampling module is used for sampling the working current of the electromagnetic heating system; the acquisition module is used for acquiring the target duty ratio and acquiring a duty ratio adjusting mode, wherein the duty ratio adjusting mode comprises a gradual change mode and a fixed mode; a control module connected to the current sampling module, the control module being configured to adjust the duty cycle in a gradual manner, firstly, the duty ratio of a control signal output to an IGBT tube in the electromagnetic heating system is controlled to be gradually reduced from a preset duty ratio to the target duty ratio, and the electromagnetic heating system is controlled to work according to the gradually reduced duty ratio, and controlling the duty ratio of the control signal to be maintained at the target duty ratio after the target duty ratio is reduced, the electromagnetic heating system works according to the target duty ratio, and is also used for controlling the electromagnetic heating system to work, and sampling the working current of the electromagnetic heating system in the heating period corresponding to the gradually-reduced duty ratio or the target duty ratio, and controlling the heating power of the electromagnetic heating system according to the sampled working current.
According to the heating control device of the electromagnetic heating system provided by the embodiment of the invention, when the duty ratio is adjusted in a gradual change mode, the control module firstly controls the duty ratio of the control signal to be gradually reduced from the preset duty ratio to the target duty ratio, controls the electromagnetic heating system to work according to the gradually reduced duty ratio, controls the duty ratio of the control signal to be kept at the target duty ratio after the control signal is reduced to the target duty ratio, and works according to the target duty ratio, and further samples the working current of the electromagnetic heating system in the gradually reduced duty ratio or the heating period corresponding to the target duty ratio in the working process of the electromagnetic heating system, and controls the heating power of the electromagnetic heating system according to the sampled working current. From this, through control duty cycle from presetting duty cycle and reducing to the target duty cycle gradually, can increase the current sampling number of times, increase power adjustment time to can improve heating power's rate of rise, the current sampling value lags behind the reduction, can gather suitable current value, prevent that electromagnetic heating system from appearing because of the phenomenon of current undersize mistake judgement as no pot, improve electromagnetic heating system low-power heating's stability, promote user's experience.
According to an embodiment of the present invention, the time for gradually decreasing from the preset duty ratio to the target duty ratio may be greater than or equal to 0.2 seconds and less than or equal to 10 seconds.
According to an embodiment of the present invention, the control module is further configured to, when the duty ratio is adjusted in a fixed manner, control the duty ratio of the control signal to be directly adjusted to the target duty ratio, and the electromagnetic heating system operates according to the target duty ratio, and during the operation of the electromagnetic heating system, obtain a heating end point of a heating period corresponding to the target duty ratio, determine a heating end interval according to the heating end point, sample the operating current of the electromagnetic heating system in the heating end interval, and control the heating power of the electromagnetic heating system according to the sampled operating current.
Therefore, the current is sampled in the heating ending interval, a larger current value can be acquired, and meanwhile, the interference caused by the turn-on of the IGBT in the electromagnetic heating system is eliminated to the maximum limit, so that the phenomenon that the electromagnetic heating system is mistakenly judged to be pan-free due to the over-small current is prevented, the low-power heating stability of the electromagnetic heating system is improved, and the user experience is improved.
According to an embodiment of the present invention, the heating end interval may be less than or equal to 8 milliseconds.
According to one embodiment of the present invention, the target duty ratio may be calculated in a half-wave period of the commercial power.
In order to achieve the above object, another embodiment of the present invention provides an electromagnetic heating system, including a heating control device of the electromagnetic heating system.
According to the electromagnetic heating system provided by the embodiment of the invention, the heating control device of the embodiment can acquire a proper current value, so that the phenomenon that the electromagnetic heating system is mistakenly judged to be pan-free due to too small current is prevented, the low-power heating stability of the electromagnetic heating system is improved, and the user experience is improved.
According to one embodiment of the present invention, the electromagnetic heating system may be an induction cooker, an electromagnetic rice cooker, an electromagnetic pressure cooker or an induction cooker.
Drawings
Fig. 1 is a flowchart of a heating control method of an electromagnetic heating system according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of duty cycle heating of an electromagnetic heating system according to one embodiment of the present invention;
FIG. 3 is a schematic illustration of a duty cycle in a heating control method of an electromagnetic heating system according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of a current sampling period of a heating control method of an electromagnetic heating system according to one embodiment of the present invention;
fig. 5 is a flowchart of a heating control method of an electromagnetic heating system according to another embodiment of the present invention;
fig. 6 is a schematic diagram of a duty ratio in a heating control method of an electromagnetic heating system according to another embodiment of the present invention;
FIG. 7 is a schematic diagram of a current sampling period of a heating control method of an electromagnetic heating system according to another embodiment of the present invention;
FIG. 8 is a block schematic diagram of a heating control device of an electromagnetic heating system according to one embodiment of the present invention; and
figure 9 is a schematic circuit diagram of an electromagnetic heating system according to one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An electromagnetic heating system for performing resonance heating of a pot placed thereon, a heating control method thereof, and a heating control apparatus thereof according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a heating control method of an electromagnetic heating system according to an embodiment of the present invention. As shown in fig. 1, the heating control method of the electromagnetic heating system includes the following steps:
s1: and acquiring a target duty ratio and acquiring a duty ratio adjusting mode, wherein the duty ratio adjusting mode comprises a gradual change mode and a fixed mode.
According to an embodiment of the present invention, the target duty ratio may be obtained according to the target heating power of the electromagnetic heating system, for example, when the target heating power is less than the preset heating power, it is determined that the electromagnetic heating system performs low-power heating, the duty ratio may be less than 1, that is, the duty ratio is used for heating, for example, 1/4, 2/4, and 3/4, and when the target heating power is greater than or equal to the preset heating power, it is determined that the electromagnetic heating system performs normal-power heating, and full-power heating (full power is equivalent to the duty ratio of 1/1) may be used. It should be understood that the heating control method of the electromagnetic heating system according to the embodiment of the present invention is mainly applicable to low-power heating, that is, the target heating power is smaller than the preset heating power.
It should be noted that, as shown in fig. 2, each duty cycle T of the duty cycle may be divided into two parts, namely a heating cycle T1 and a stop cycle T2, where the duty cycle may be a ratio of the heating cycle T1 to the duty cycle T, and T1+ T2, for example, when the heating cycle T1 is 1 half-cycle of the mains supply and the stop heating cycle is 3 half-cycles of the mains supply, the duty cycle is 1/4; when the heating period T1 is 2 mains supply half-wave periods and the heating stop period is 2 mains supply half-wave periods, the duty ratio is 2/4; when the heating period T1 is 3 mains supply half-wave periods and the heating stop period is 1 mains supply half-wave period, the duty ratio is 3/4.
According to one embodiment of the present invention, the target duty cycle may be in units of a half-wave period of the commercial power. That is, when the duty heating is adopted, the duty heating of 1/4, 2/4, and 3/4 can be realized in units of half-wave periods of the commercial power.
S2: when the duty ratio is adjusted in a gradual change mode, the duty ratio of a control signal output to an IGBT tube in the electromagnetic heating system is controlled to be gradually reduced from a preset duty ratio to a target duty ratio, the electromagnetic heating system is controlled to work according to the gradually reduced duty ratio, the duty ratio of the control signal is controlled to be kept at the target duty ratio after the control signal is reduced to the target duty ratio, and the electromagnetic heating system works according to the target duty ratio.
That is, as shown in fig. 3, the heating process of the electromagnetic heating system may include two stages, namely, a start-up stage D1 and a normal stage D2, wherein, in the start-up stage D1, the duty ratio is adjusted in a gradual manner, that is, the duty ratio of the control signal output to the IGBT tube by the control module of the electromagnetic heating system is gradually reduced from the preset duty ratio to the target duty ratio, thereby heating is performed by the gradual duty ratio; in the normal phase D2, the duty ratio of the control signal output by the control module of the electromagnetic heating system to the IGBT tube is maintained at the target duty ratio, and thus heating is performed with the normal target duty ratio.
The preset duty cycle may be a preset larger duty cycle, such as 1/1, 3/4, etc.
It should be noted that the duty cycle may be gradually decreased in various ways, for example, in one example, when the duty ratios of the control signals which can be output by the control module are N (N is more than 1), the N duty ratios are sorted according to the size, the duty ratios of the control signals may be controlled to sequentially decrease from a maximum duty ratio among the N duty ratios to a target duty ratio, that is, assuming that the 1 st duty ratio is the smallest and the nth duty ratio is the largest, when the target duty ratio is the 1 st duty ratio, the duty ratio of the control signal can be controlled to be kept at the Nth duty ratio preset time, then the duty ratio of the control signal is controlled to be kept at the (N-1) th duty ratio preset time, then the duty ratio of the control signal is controlled to be kept at the (N-2) th duty ratio preset time, and so on, and finally the duty ratio of the control signal is reduced to be the 1 st duty ratio.
As described above, in the embodiment of fig. 3, during the start-up phase D1, the duty ratio of the control signal can be controlled to gradually decrease from the larger duty ratio to the target duty ratio, wherein the larger duty ratio is 1/1, i.e., full power heating (transient power is very small), and the target duty ratio is 1/4, and the full power heating can be gradually changed to 1/4 according to the rule of 1 → 3/4 → 2/4 → 1/4, during which the transient power of the interval gradually increases. In other words, when the 1/4 duty ratio is adopted to realize low power heating, the duty ratio of the control signal can be gradually reduced from 1/1 to 1/4 in the starting phase D1, and then the duty ratio of the control signal is kept at the normal 1/4 in the normal phase D2.
According to an embodiment of the present invention, the time for gradually decreasing from the preset duty ratio to the target duty ratio is greater than or equal to 0.2 seconds and less than or equal to 10 seconds. That is, the duration of the startup phase may be greater than or equal to 0.2 seconds and less than or equal to 10 seconds.
S3: in the working process of the electromagnetic heating system, the working current of the electromagnetic heating system is sampled in the heating period corresponding to the gradually-reduced duty ratio or the target duty ratio, and the heating power of the electromagnetic heating system is controlled according to the sampled working current.
That is to say, during low-power heating, current sampling is performed in a heating period, for example, current sampling periods corresponding to 1/4 duty cycles, 2/4 duty cycles, and 3/4 duty cycles may be respectively shown as shaded regions a1, a2, and A3 in fig. 4, and then the heating power of the electromagnetic heating system is adjusted in real time according to the sampled working current, that is, the pulse width of the control signal is adjusted according to the sampled working current, for example, when the control signal is a PPG signal, the PPG value is adjusted, and the larger the PPG value is, the larger the heating power is.
It can be understood that, when low-power heating is started, the sampled working current may be filtered by a software filtering (for example, summing and averaging) manner, so as to cause a sampling value to lag, and for the technical scheme of performing low-power heating at a target duty ratio and sampling current in a heating period in the related art, because a stop period is long, the finally sampled working current is more likely to lag, and it is more likely to cause an out-of-control PPG value adjustment, for example, increasing the PPG value, which is likely to cause an excessive instantaneous power, and the current flowing through the IGBT is burned out due to an excessive current.
In the embodiment of the invention, the duty ratio of the control signal is controlled to be gradually reduced to the target duty ratio in the starting stage D1, and then the duty ratio of the control signal is controlled to be at the target duty ratio in the normal stage D2, so that the sampling times can be increased, the power adjustment time is increased, the power rise is obvious, the current sampling value lag is reduced, a proper current value can be acquired, the phenomenon that the electromagnetic heating system is mistakenly judged to be pan-free due to too small current is prevented, the stability of low-power heating of the electromagnetic heating system is improved, and the user experience is improved.
According to an embodiment of the present invention, the operating current of the electromagnetic heating system may be an emitter current of the IGBT tube, for example, the emitter current of the IGBT tube may be sampled by a current sampling module as shown in fig. 9.
Therefore, according to the heating control method of the electromagnetic heating system provided by the embodiment of the invention, when the duty ratio is adjusted in a gradual change manner, the duty ratio of the electromagnetic heating system is controlled to be gradually reduced from the preset duty ratio to the target duty ratio, the electromagnetic heating system is controlled to work according to the gradually reduced duty ratio, the duty ratio of the electromagnetic heating system is controlled to be kept at the target duty ratio after the duty ratio is reduced to the target duty ratio, the electromagnetic heating system works according to the target duty ratio, further, in the working process of the electromagnetic heating system, the working current of the electromagnetic heating system is sampled at the gradually reduced duty ratio or the heating period corresponding to the target duty ratio, and the heating power of the electromagnetic heating system is controlled according to the sampled working current. From this, through control duty cycle from presetting duty cycle and reducing to the target duty cycle gradually, can increase the current sampling number of times, increase power adjustment time to can improve heating power's rate of rise, the current sampling value lags behind the reduction, can gather suitable current value, prevent that electromagnetic heating system from appearing because of the phenomenon of current undersize mistake judgement as no pot, improve electromagnetic heating system low-power heating's stability, promote user's experience.
According to another embodiment of the present invention, as shown in fig. 5, after step S1, the heating control method of the embodiment of the present invention further includes the steps of:
s4: when the duty ratio is adjusted in a fixed mode, the duty ratio of the control signal is directly adjusted to a target duty ratio, and the electromagnetic heating system works according to the target duty ratio.
That is, as shown in fig. 6, it is assumed that the heating process of the electromagnetic heating system includes two phases, i.e., a start-up phase D1 and a normal phase D2, wherein in both the start-up phase D1 and the normal phase D2, the duty ratio of the control signal output to the IGBT tube by the control module of the electromagnetic heating system is maintained at the target duty ratio, and thus, the heating is performed by the normal target duty ratio.
S5: in the working process of the electromagnetic heating system, a heating end point of a heating period corresponding to a target duty ratio is obtained, a heating end interval is determined according to the heating end point, the working current of the electromagnetic heating system is sampled in the heating end interval, and the heating power of the electromagnetic heating system is controlled according to the sampled working current.
It should be understood that, as shown in fig. 7, due to the existence of the filter capacitors (e.g., EC1 and C4 in fig. 9) in the current sampling module, the current sampling signal (e.g., the current at the AD point in fig. 9) rises relatively slowly, and after the heating period in each duty cycle is over, the current sampling signal keeps falling for a certain time, and the current value is higher.
Based on this, in the embodiment of the present invention, as shown in fig. 7, a heating end interval T3 is set near the heating period end point B, for example, a range defined by a preset time length before and after the heating period end point B is set as the heating end interval T3, so that the operating current of the electromagnetic heating system is sampled in the heating end interval T3 near the heating period end point B, and the heating power of the electromagnetic heating system is controlled according to the sampled operating current. From this, can gather higher current sampling value, furthest eliminates IGBT simultaneously and opens the interference that brings, and is more stable to can gather suitable current value, prevent that electromagnetic heating system from appearing because of the phenomenon of current undersize mistake judgement for no pot, improve electromagnetic heating system low power heating's stability, promote user's experience.
According to one embodiment of the invention, the heating end interval can be less than or equal to 8 milliseconds, namely T3 is less than or equal to 8 ms.
Therefore, according to the heating control method of the electromagnetic heating system provided by the embodiment of the invention, when the duty ratio is adjusted in a fixed manner, the duty ratio of the electromagnetic heating system is controlled to be directly adjusted to the target duty ratio, the electromagnetic heating system works according to the target duty ratio, further, in the process of working of the electromagnetic heating system, the heating end point of the heating period corresponding to the target duty ratio is obtained, the heating end interval is determined according to the heating end point, the working current of the electromagnetic heating system is sampled in the heating end interval, and the heating power of the electromagnetic heating system is controlled according to the sampled working current. Therefore, the current is sampled in the heating ending interval, a larger current value can be acquired, and meanwhile, the interference caused by the turn-on of the IGBT in the electromagnetic heating system is eliminated to the maximum limit, so that the phenomenon that the electromagnetic heating system is mistakenly judged to be pan-free due to the over-small current is prevented, the low-power heating stability of the electromagnetic heating system is improved, and the user experience is improved.
In order to implement the heating control method of the electromagnetic heating system, the embodiment of the invention also provides a heating control device of the electromagnetic heating system.
Fig. 8 is a block schematic diagram of a heating control device of an electromagnetic heating system according to one embodiment of the present invention. As shown in fig. 8, the heating control device of the electromagnetic heating system includes: a current sampling module 11, an acquisition module 12 and a control module 13.
Specifically, as shown in fig. 9, the electromagnetic heating system includes a resonant circuit 20, the resonant circuit 20 includes an IGBT tube Q1, a resonant capacitor C2 and a heating coil L2, the resonant capacitor C2 and the heating coil L2 may be connected in parallel, one end of the parallel resonant capacitor C2 and one end of the heating coil L2 are connected to a filter inductor L1 and further connected to one end of a filter capacitor C1, the other end of the filter capacitor C1 is grounded, the other end of the parallel resonant capacitor C2 and the other end of the heating coil L2 are connected to a C pole of the IGBT tube Q1, an E pole of the IGBT tube Q1 is grounded, a G pole of the IGBT tube Q1 is connected to the control module 13, and the IGBT tube Q1 may be turned on or off under the control of a control signal output by the control module 13.
In the embodiment of the present invention, the current sampling module 11 is configured to sample an operating current of the electromagnetic heating system; the obtaining module 12 is configured to obtain a target duty ratio and obtain a duty ratio adjusting mode, where the duty ratio adjusting mode includes a gradual change mode and a fixed mode; the control module 13 is connected to the current sampling module 11, and when the duty ratio is adjusted in a gradual change manner, the control module 13 is configured to first control the duty ratio of a control signal output to the IGBT Q1 in the electromagnetic heating system to gradually decrease from a preset duty ratio to a target duty ratio, and control the electromagnetic heating system to operate according to the gradually decreasing duty ratio, and then control the duty ratio of the control signal to maintain at the target duty ratio after decreasing to the target duty ratio, and operate the electromagnetic heating system according to the target duty ratio, and further, in a process of operating the electromagnetic heating system, sample a working current of the electromagnetic heating system at the gradually decreasing duty ratio or a heating period corresponding to the target duty ratio, and control a heating power of the electromagnetic heating system according to the sampled working current.
According to an embodiment of the present invention, the control module 13 may obtain a target duty ratio according to a target heating power of the electromagnetic heating system, for example, when the target heating power is less than a preset heating power, it is determined that the electromagnetic heating system performs low-power heating, and the duty ratio is less than 1, that is, the electromagnetic heating system performs heating in a duty ratio manner, such as 1/4, 2/4, and 3/4, and when the target heating power is greater than or equal to the preset heating power, it is determined that the electromagnetic heating system performs normal-power heating, and full-power heating (full power is equivalent to the duty ratio of 1/1) may be employed. It should be understood that the heating control device of the electromagnetic heating system according to the embodiment of the present invention is mainly suitable for low-power heating, that is, the target heating power is smaller than the preset heating power.
It should be noted that, as shown in fig. 2, each duty cycle T of the duty cycle may be divided into two parts, namely a heating cycle T1 and a stop cycle T2, where the duty cycle may be a ratio of the heating cycle T1 to the duty cycle T, and T1+ T2, for example, when the heating cycle T1 is 1 half-cycle of the mains supply and the stop heating cycle is 3 half-cycles of the mains supply, the duty cycle is 1/4; when the heating period T1 is 2 mains supply half-wave periods and the heating stop period is 2 mains supply half-wave periods, the duty ratio is 2/4; when the heating period T1 is 3 mains supply half-wave periods and the heating stop period is 1 mains supply half-wave period, the duty ratio is 3/4.
According to one embodiment of the present invention, the target duty cycle may be in units of a half-wave period of the commercial power. That is, when the control module 13 performs heating in the duty cycle manner, the duty cycle heating of 1/4, 2/4, and 3/4 may be implemented in units of half-wave periods of the commercial power.
Further, as shown in fig. 3, the heating process of the electromagnetic heating system may include two phases, namely, a start-up phase D1 and a normal phase D2, wherein, in the start-up phase D1, the duty ratio is adjusted in a gradual manner, that is, the duty ratio of the control signal output by the control module 13 to the IGBT tube Q1 is gradually reduced from the preset duty ratio to the target duty ratio, thereby performing heating by the gradual duty ratio; in the normal phase D2, the duty ratio of the control signal output by the control module 13 of the electromagnetic heating system to the IGBT transistor Q1 is maintained at the target duty ratio, and thus heating is performed at the normal target duty ratio.
The preset duty cycle may be a preset larger duty cycle, such as 1/1, 3/4, etc.
It should be noted that the duty cycle may be gradually decreased in various ways, for example, in one example, when the duty ratios of the control signals which can be output by the control module are N (N is more than 1), the N duty ratios are sorted according to the size, the duty ratios of the control signals may be controlled to sequentially decrease from a maximum duty ratio among the N duty ratios to a target duty ratio, that is, assuming that the 1 st duty ratio is the smallest and the nth duty ratio is the largest, when the target duty ratio is the 1 st duty ratio, the duty ratio of the control signal can be controlled to be kept at the Nth duty ratio preset time, then the duty ratio of the control signal is controlled to be kept at the (N-1) th duty ratio preset time, then the duty ratio of the control signal is controlled to be kept at the (N-2) th duty ratio preset time, and so on, and finally the duty ratio of the control signal is reduced to be the 1 st duty ratio.
As described above, in the embodiment of fig. 3, during the start-up phase D1, the control module 13 may control the duty ratio of the control signal to gradually decrease from a larger duty ratio to a target duty ratio, wherein the larger duty ratio is 1/1, i.e., full power heating (transient power is very small), and the target duty ratio is 1/4, and the full power heating may gradually change to 1/4 according to the rule of 1 → 3/4 → 2/4 → 1/4, during which the transient power of the interval gradually increases. In other words, when 1/4 duty ratio is adopted to achieve low power heating, the control module 13 may gradually decrease the duty ratio of the control signal from 1/1 to 1/4 during the startup phase D1, and then maintain the duty ratio of the control signal at the normal 1/4 during the normal phase D2.
According to an embodiment of the present invention, the time for gradually decreasing from the preset duty ratio to the target duty ratio is greater than or equal to 0.2 seconds and less than or equal to 10 seconds. That is, the duration of the start-up phase D1 may be greater than or equal to 0.2 seconds and less than or equal to 10 seconds.
Specifically, during low-power heating, the control module 13 may control the current sampling module 11 to perform current sampling within a heating period, for example, current sampling periods corresponding to 1/4 duty cycles, 2/4 duty cycles, and 3/4 duty cycles may be respectively shown as shaded areas a1, a2, and A3 in fig. 4, and then the control module 13 adjusts the heating power of the electromagnetic heating system in real time according to the sampled working current, that is, adjusts the pulse width of the control signal according to the sampled working current, for example, adjusts the PPG value when the control signal is the PPG signal, and the larger the PPG value is, the larger the heating power is.
It can be understood that, when low-power heating is started, the sampled working current may be filtered by a software filtering (for example, summing and averaging) manner, so as to cause a sampling value to lag, and for the technical scheme of performing low-power heating at a target duty ratio and sampling current in a heating period in the related art, because a stop period is long, the finally sampled working current is more likely to lag, and it is more likely to cause an out-of-control PPG value adjustment, for example, increasing the PPG value, which is likely to cause an excessive instantaneous power, and the current flowing through the IGBT is burned out due to an excessive current.
In the embodiment of the present invention, the control module 13 first controls the duty ratio of the control signal to be gradually reduced to the target duty ratio in the start stage D1, and then controls the duty ratio of the control signal to be at the target duty ratio in the normal stage D2, so that as can be seen from the example in fig. 4, the sampling period can be increased, the power adjustment time is increased, the power rise is obvious, and the current sampling value lag is reduced, so that a proper current value can be acquired, the phenomenon that the electromagnetic heating system is mistakenly determined as no pot due to too small current is prevented, the stability of low-power heating of the electromagnetic heating system is improved, and the user experience is improved.
Therefore, according to the heating control device of the electromagnetic heating system provided by the embodiment of the invention, when the duty ratio is adjusted in a gradual change manner, the control module firstly controls the duty ratio of the electromagnetic heating system to be gradually reduced from the preset duty ratio to the target duty ratio, controls the electromagnetic heating system to work according to the gradually reduced duty ratio, controls the duty ratio of the electromagnetic heating system to be kept at the target duty ratio after the duty ratio is reduced to the target duty ratio, and works according to the target duty ratio, and further samples the working current of the electromagnetic heating system in the gradually reduced duty ratio or the heating period corresponding to the target duty ratio in the working process of the electromagnetic heating system, and controls the heating power of the electromagnetic heating system according to the sampled working current. From this, through control duty cycle from presetting duty cycle and reducing to the target duty cycle gradually, can increase the current sampling number of times, increase power adjustment time to can improve heating power's rate of rise, the current sampling value lags behind the reduction, can gather suitable current value, prevent that electromagnetic heating system from appearing because of the phenomenon of current undersize mistake judgement as no pot, improve electromagnetic heating system low-power heating's stability, promote user's experience.
According to another embodiment of the present invention, the control module 13 is further configured to, when the duty ratio is adjusted in a fixed manner, directly adjust the duty ratio of the control signal to a target duty ratio, operate the electromagnetic heating system according to the target duty ratio, obtain a heating end point of a heating period corresponding to the target duty ratio during the operation of the electromagnetic heating system, determine a heating end interval according to the heating end point, sample an operating current of the electromagnetic heating system during the heating end interval, and control the heating power of the electromagnetic heating system according to the sampled operating current.
That is, as shown in fig. 6, it is assumed that the heating process of the electromagnetic heating system includes two phases, namely, a start-up phase D1 and a normal phase D2, wherein in the start-up phase D1 and the normal phase D2, the duty ratios of the control signals output by the control module 13 of the electromagnetic heating system to the IGBT tube Q1 are both maintained at the target duty ratios, and thus, the heating is performed by the normal target duty ratios.
It should be understood that, as shown in fig. 7, due to the existence of the filter capacitors (e.g., EC1 and C4 in fig. 9) in the current sampling module, the current sampling signal (e.g., the current at the AD point in fig. 9) rises relatively slowly, and after the heating period in each duty cycle is over, the current sampling signal keeps falling for a certain time, and the current value is higher.
Based on this, in the embodiment of the present invention, as shown in fig. 7, a heating end interval T3 is set near the heating period end point B, for example, a range defined by a preset time length before and after the heating period end point B is used as the heating end interval T3, so that the control module 13 controls the current sampling module 11 to sample the working current of the electromagnetic heating system and controls the heating power of the electromagnetic heating system according to the sampled working current in the heating end interval T3 near the heating period end point B. From this, can gather higher current sampling value, furthest eliminates IGBT simultaneously and opens the interference that brings, and is more stable to can gather suitable current value, prevent that electromagnetic heating system from appearing because of the phenomenon of current undersize mistake judgement for no pot, improve electromagnetic heating system low power heating's stability, promote user's experience.
According to one embodiment of the invention, the heating end interval can be less than or equal to 8 milliseconds, namely T3 is less than or equal to 8 ms.
Therefore, according to the heating control device of the electromagnetic heating system provided by the embodiment of the invention, when the duty ratio is adjusted in a fixed manner, the control module controls the duty ratio of the electromagnetic heating system to be directly adjusted to the target duty ratio, and operates the electromagnetic heating system according to the target duty ratio, further obtains the heating end point of the heating period corresponding to the target duty ratio in the operation process of the electromagnetic heating system, determines the heating end interval according to the heating end point, samples the working current of the electromagnetic heating system in the heating end interval, and controls the heating power of the electromagnetic heating system according to the sampled working current. Therefore, the current is sampled in the heating ending interval, a larger current value can be acquired, and meanwhile, the interference caused by the turn-on of the IGBT in the electromagnetic heating system is eliminated to the maximum limit, so that the phenomenon that the electromagnetic heating system is mistakenly judged to be pan-free due to the over-small current is prevented, the low-power heating stability of the electromagnetic heating system is improved, and the user experience is improved.
According to an embodiment of the present invention, the operating current of the electromagnetic heating system may be the emitter current of the IGBT tube Q1, for example, the emitter current of the IGBT tube may be sampled by the current sampling module 11 as shown in fig. 9.
Specifically, as shown in fig. 9, the current sampling module 11 includes a sampling resistor RC, a first resistor R1, a third capacitor C3, a second resistor R2, a third resistor R3, a fourth resistor R4, a comparator AMP1, a fourth capacitor C1, and an electrolytic capacitor EC 1.
Wherein, a sampling resistor RC, such as a constantan wire, is connected in series between the emitter of the IGBT tube Q1 and the ground; one end of the first resistor R1 is connected with a node between the sampling resistor RC and the emitter of the IGBT tube Q1; one end of a third capacitor C3 is connected with the other end of the first resistor R1, and the other end of the third capacitor C3 is grounded; one end of the second resistor R2 is connected with the other end of the first resistor R1; one end of the fourth resistor R4 is grounded; a positive input end of the comparator AMP1 is connected with the other end of the second resistor R2 and one end of the third resistor R3 respectively, a negative input end of the comparator AMP1 is connected with the other end of the fourth resistor R4, and an output end of the comparator AMP1 is connected with the other end of the third resistor R3; one end of the fourth capacitor C1 is connected to the output terminal of the comparator AMP 1; the electrolytic capacitor EC1 is connected in parallel with the fourth capacitor C1. The amplification factor of the current sampling module 11 is (1+ R3/R2).
Therefore, the current sampling module 11 may collect the emitter current of the IGBT Q1 to generate a current sampling signal, and send the current sampling signal to the control module 13, so that the control module 13 controls the heating power of the electromagnetic heating system according to the current sampling signal.
Finally, the embodiment of the invention also provides an electromagnetic heating system, which comprises the heating control device of the electromagnetic heating system of the embodiment.
According to the electromagnetic heating system provided by the embodiment of the invention, the heating control device of the embodiment can acquire a proper current value, so that the phenomenon that the electromagnetic heating system is mistakenly judged to be pan-free due to too small current is prevented, the low-power heating stability of the electromagnetic heating system is improved, and the user experience is improved.
According to an embodiment of the present invention, the electromagnetic heating system may be an induction cooker, an electromagnetic rice cooker, an electromagnetic pressure cooker, an electromagnetic range, or the like.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A heating control method of an electromagnetic heating system is characterized by comprising the following steps:
acquiring a target duty ratio and acquiring a duty ratio adjusting mode, wherein the duty ratio adjusting mode comprises a gradual change mode and a fixed mode;
when the duty ratio is adjusted in a gradual change mode, firstly, the duty ratio of a control signal output to an IGBT tube in the electromagnetic heating system is controlled to be gradually reduced from a preset duty ratio to the target duty ratio, the electromagnetic heating system is controlled to work according to the gradually reduced duty ratio, after the duty ratio is reduced to the target duty ratio, the duty ratio of the control signal is controlled to be kept at the target duty ratio, and the electromagnetic heating system works according to the target duty ratio;
in the process of working of the electromagnetic heating system, sampling the working current of the electromagnetic heating system in the heating period corresponding to the gradually-reduced duty ratio or the target duty ratio, and controlling the heating power of the electromagnetic heating system according to the sampled working current;
when the duty ratio is adjusted in a fixed mode, controlling the duty ratio of the control signal to be directly adjusted to the target duty ratio, and enabling the electromagnetic heating system to work according to the target duty ratio;
in the working process of the electromagnetic heating system, a heating end point of a heating period corresponding to the target duty ratio is obtained, a heating end interval is determined according to the heating end point, the working current of the electromagnetic heating system is sampled in the heating end interval, and the heating power of the electromagnetic heating system is controlled according to the sampled working current.
2. The heating control method of an electromagnetic heating system according to claim 1, wherein a time for gradually decreasing from the preset duty ratio to the target duty ratio is 0.2 seconds or more and 10 seconds or less.
3. The heating control method of an electromagnetic heating system according to claim 1, characterized in that the heating end interval is less than or equal to 8 milliseconds.
4. A heating control method of an electromagnetic heating system according to any one of claims 1 to 3, characterized in that the target duty ratio is in units of a half-wave period of commercial power.
5. A heating control device of an electromagnetic heating system, comprising:
the current sampling module is used for sampling the working current of the electromagnetic heating system;
the device comprises an acquisition module, a comparison module and a control module, wherein the acquisition module is used for acquiring a target duty ratio and acquiring a duty ratio adjusting mode, and the duty ratio adjusting mode comprises a gradual change mode and a fixed mode;
a control module connected to the current sampling module, the control module being configured to adjust the duty cycle in a gradual manner, firstly, the duty ratio of a control signal output to an IGBT tube in the electromagnetic heating system is controlled to be gradually reduced from a preset duty ratio to the target duty ratio, and the electromagnetic heating system is controlled to work according to the gradually reduced duty ratio, and controlling the duty ratio of the control signal to be maintained at the target duty ratio after the target duty ratio is reduced, the electromagnetic heating system works according to the target duty ratio, and is also used for controlling the electromagnetic heating system to work, sampling the working current of the electromagnetic heating system in the heating period corresponding to the gradually-reduced duty ratio or the target duty ratio, and controlling the heating power of the electromagnetic heating system according to the sampled working current;
the control module is further used for controlling the duty ratio of the control signal to be directly adjusted to the target duty ratio when the duty ratio is adjusted in a fixed mode, the electromagnetic heating system works according to the target duty ratio, in the working process of the electromagnetic heating system, the heating end point of the heating period corresponding to the target duty ratio is obtained, the heating end interval is determined according to the heating end point, the working current of the electromagnetic heating system is sampled in the heating end interval, and the heating power of the electromagnetic heating system is controlled according to the sampled working current.
6. The heating control device of an electromagnetic heating system according to claim 5, wherein a time for gradually decreasing from the preset duty ratio to the target duty ratio is 0.2 seconds or more and 10 seconds or less.
7. A heating control device of an electromagnetic heating system according to claim 5, characterized in that the heating end interval is less than or equal to 8 milliseconds.
8. A heating control method of an electromagnetic heating system according to any one of claims 5 to 7, characterized in that the target duty ratio is in a unit of calculation of a half-wave period of commercial power.
9. An electromagnetic heating system, characterized by comprising a heating control device of an electromagnetic heating system according to any one of claims 5-8.
10. The electromagnetic heating system according to claim 9, wherein the electromagnetic heating system is an induction cooker, an electromagnetic rice cooker, an electromagnetic pressure cooker or an induction cooker.
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