CN107567122B - Electromagnetic heating cooking system and heating control device and control method thereof - Google Patents
Electromagnetic heating cooking system and heating control device and control method thereof Download PDFInfo
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- CN107567122B CN107567122B CN201610520714.4A CN201610520714A CN107567122B CN 107567122 B CN107567122 B CN 107567122B CN 201610520714 A CN201610520714 A CN 201610520714A CN 107567122 B CN107567122 B CN 107567122B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 593
- 238000010411 cooking Methods 0.000 title claims abstract description 94
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- 238000001514 detection method Methods 0.000 claims description 35
- 230000006698 induction Effects 0.000 claims description 6
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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Abstract
The invention discloses a heating control method of an electromagnetic heating cooking system, which comprises the following steps: detecting alternating current provided by an alternating current power supply to obtain an alternating current half cycle of the alternating current; taking N continuous alternating current half cycles of alternating current as a heating cycle of the electromagnetic heating cooking system; in each heating period, the heating device of the electromagnetic heating cooking system is controlled to continuously heat in M continuous alternating current half periods, and heating is stopped in the rest (N-M) sine wave periods to adjust the heating power of the heating device, wherein N is an integer greater than or equal to 4, and M is a positive integer smaller than N, so that low-power heating is realized, the instantaneous heating power is reduced, meanwhile, the commutation time of the circuit can be increased by increasing the heating period, the change of the current waveform is reduced, the harmonic current is reduced, and the safety performance of the electromagnetic heating cooking system is improved. The invention also discloses an electromagnetic heating cooking system and a heating control device thereof.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a heating control method of an electromagnetic heating cooking system, a control device of the electromagnetic heating cooking system and the electromagnetic heating cooking system with the control device.
Background
The related electromagnetic heating cooking system generally adopts a wave-loss mode to perform low-power heating, namely heating at a certain duty ratio in a preset period, so as to realize low-power heating. In the related art, such a wave-dropping method generally performs heating counting in a half-wave counting manner, as shown in fig. 1, if the full-wave heating power is 1200W, the electromagnetic heating cooking system heats in the positive half-cycle of the power supply, and stops heating in the negative half-cycle of the power supply to control the heating power to be 600W. However, the method has the defects that the load current of the positive half cycle and the negative half cycle of the power supply is unbalanced, the current waveform conversion frequency is high, the harmonic current test is easy to exceed the standard, and even the electromagnetic heating cooking system is damaged.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, an object of the present invention is to provide a heating control method of an electromagnetic heating cooking system, which can reduce harmonic current.
Another object of the present invention is to provide a heating control device of an electromagnetic heating cooking system. It is yet another object of the present invention to provide an electromagnetic heating cooking system.
In order to achieve the above object, an embodiment of the present invention provides a heating control method for an electromagnetic heating cooking system, including the following steps: detecting alternating current provided by an alternating current power supply to obtain an alternating current half cycle of the alternating current; taking N continuous alternating current half cycles of the alternating current as a heating cycle of the electromagnetic heating cooking system; and in each heating period, controlling the heating device of the electromagnetic heating cooking system to continuously heat in M continuous alternating current half periods, and stopping heating in the rest (N-M) alternating current half periods to adjust the heating power of the heating device, wherein N is an integer greater than or equal to 4, and M is a positive integer less than N.
According to the heating control method of the electromagnetic heating cooking system provided by the embodiment of the invention, the alternating current provided by the alternating current power supply is detected to obtain the alternating current half cycle of the alternating current, and taking N continuous alternating current half cycles of the alternating current as a heating cycle of the electromagnetic heating cooking system, in each heating period, the heating device of the electromagnetic heating cooking system is controlled to continuously heat in continuous M alternating current half periods, and stopping heating for the remaining (N-M) alternating current half cycles to adjust the heating power of the heating device, wherein N is an integer of 4 or more and M is a positive integer of less than N, thereby realizing low power heating and reducing instantaneous heating power, meanwhile, by increasing the heating period, the current conversion time of the circuit can be increased, and the change of the current waveform is reduced, so that the harmonic current is reduced, and the safety performance of the electromagnetic heating cooking system is improved.
According to one embodiment of the present invention, detecting an alternating current provided by an alternating current power source to obtain an alternating current half cycle of the alternating current comprises: detecting a zero-crossing point of alternating current provided by the alternating current power supply to generate a zero-crossing detection signal; and acquiring an alternating current half cycle of the alternating current according to the zero-crossing detection signal.
According to an embodiment of the present invention, when N is 4, in each heating period, if the heating device is controlled to continue heating for 2 consecutive alternating-current half periods and stop heating for the remaining 2 alternating-current half periods, the heating device heats at 2/4P, where P is the heating power at which the heating device heats every alternating-current half period; if the heating device is controlled to continuously heat in 1 alternating current half cycle and stops heating in the remaining 3 alternating current half cycles, the heating device heats with 1/4P heating power; if the heating device is controlled to continue heating for 3 consecutive ac half cycles and stop heating for the remaining 1 ac half cycle, the heating device heats with a heating power of 3/4P.
According to another embodiment of the present invention, when N is 5, in each heating period, if the heating device is controlled to continue heating for 1 ac half cycle and stop heating for the remaining 4 ac half cycles, the heating device heats at 1/5P, where P is the heating power at which the heating device heats every ac half cycle; if the heating device is controlled to continue heating for 4 consecutive ac half cycles and stop heating for the remaining 1 ac half cycle, the heating device heats with a heating power of 4/5P.
In order to achieve the above object, according to another aspect of the present invention, a heating control device for an electromagnetic heating cooking system includes: the detection module is used for detecting the alternating current provided by the alternating current power supply to obtain an alternating current half cycle of the alternating current; and the control module is connected with the detection module and is used for taking N continuous alternating-current half periods of the alternating current as heating periods of the electromagnetic heating cooking system, controlling a heating device of the electromagnetic heating cooking system to continuously heat in M continuous alternating-current half periods and stopping heating in the rest (N-M) alternating-current half periods in each heating period so as to adjust the heating power of the heating device, wherein N is an integer greater than or equal to 4, and M is a positive integer less than N.
According to the heating control device of the electromagnetic heating cooking system provided by the embodiment of the invention, the alternating current provided by the alternating current power supply is detected by the detection module to obtain the alternating current half cycle of the alternating current, the control module takes continuous N alternating current half cycles of the alternating current as the heating cycles of the electromagnetic heating cooking system, and in each heating cycle, the heating device of the electromagnetic heating cooking system is controlled to continuously heat in continuous M alternating current half cycles and stop heating in the rest (N-M) alternating current half cycles to adjust the heating power of the heating device, wherein N is an integer which is greater than or equal to 4, M is a positive integer which is less than N, so that low-power heating is realized and the instantaneous heating power is reduced, meanwhile, the commutation time of a circuit can be increased by increasing the heating cycle, the change of a current waveform is reduced, and the harmonic current in the circuit is reduced, the safety performance of the electromagnetic heating cooking system is improved.
According to an embodiment of the invention, the detection module further comprises: a zero-crossing detection unit for detecting a zero-crossing point of the alternating current supplied from the alternating current power supply to generate a zero-crossing detection signal; and the acquisition unit is used for acquiring the alternating current half cycle of the alternating current according to the zero-crossing detection signal. According to an embodiment of the present invention, when N is 4, in each heating period, if the control module controls the heating device to continue heating for 2 consecutive ac half-cycles and stop heating for the remaining 2 ac half-cycles, the heating device heats with a heating power of 2/4P, where P is the heating power when the heating device heats every ac half-cycle; if the control module controls the heating device to continue heating for 1 AC half-cycle and stop heating for the remaining 3 AC half-cycles, the heating device heats with a heating power of 1/4P; if the control module controls the heating device to continue heating for 3 consecutive ac half cycles and stop heating for the remaining 1 ac half cycle, the heating device heats with a heating power of 3/4P.
According to another embodiment of the present invention, when N is 5, in each heating period, if the control module controls the heating device to continue heating for 1 ac half-cycle and stop heating for the remaining 4 ac half-cycles, the heating device heats with a heating power of 1/5P, where P is the heating power when the heating device heats every ac half-cycle; if the control module controls the heating device to continue heating for 4 consecutive ac half cycles and stop heating for the remaining 1 ac half cycle, the heating device heats with a heating power of 4/5P.
In order to achieve the above object, another embodiment of the present invention provides an electromagnetic heating cooking system, which includes a heating control device of the electromagnetic heating cooking system.
According to the electromagnetic heating cooking system provided by the embodiment of the invention, low-power heating is realized and the instant heating power is reduced through the heating control device of the electromagnetic heating cooking system, and meanwhile, the commutation time of the circuit can be increased and the change of the current waveform is reduced by increasing the heating period, so that the harmonic current in the circuit is reduced, the potential safety hazard is reduced, and the user experience is improved.
According to an embodiment of the present invention, the electromagnetic heating cooking system may be an induction cooker, an electromagnetic rice cooker or an electromagnetic pressure cooker.
Drawings
FIG. 1 is a waveform diagram illustrating low power heating of a related art electromagnetic heating cooking system, wherein the heating power is half of the full wave heating power;
fig. 2 is a flowchart of a heating control method of an electromagnetic heating cooking system according to an embodiment of the present invention;
fig. 3a is an operation schematic diagram of a heating control method of an electromagnetic heating cooking system according to an embodiment of the present invention, wherein N is 4;
fig. 3b is an operation schematic diagram of a heating control method of an electromagnetic heating cooking system according to another embodiment of the present invention, wherein N-4;
fig. 3c is an operation schematic diagram of a heating control method of an electromagnetic heating cooking system according to still another embodiment of the present invention, wherein N-4;
fig. 4a is an operation schematic diagram of a heating control method of an electromagnetic heating cooking system according to an embodiment of the present invention, wherein N is 5;
fig. 4b is an operation schematic diagram of a heating control method of an electromagnetic heating cooking system according to another embodiment of the present invention, wherein N-5;
FIG. 5a is a block diagram of a heating control device of an electromagnetic heating cooking system according to an embodiment of the present invention;
FIG. 5b is a block diagram of a heating control device of an electromagnetic heating cooking system according to an embodiment of the present invention; and
fig. 6 is a schematic circuit diagram of an electromagnetic heating cooking system according to an embodiment of the present invention.
Reference numerals:
the device comprises a detection module 1, a control module 2, a zero-crossing detection unit 3 and an acquisition unit 4;
the heating control device 10, the EMC module 3, the rectifier module 4, the filter module 5, the resonance module 6 and the power switch tube 7.
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 cooking system, a heating control apparatus and a control method thereof according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
Fig. 2 is a flowchart of a heating control method of an electromagnetic heating cooking system according to an embodiment of the present invention. As shown in fig. 2, the heating control method includes the steps of:
s1: the alternating current provided by the alternating current power supply is detected to obtain an alternating current half cycle of the alternating current.
According to one embodiment of the present invention, detecting the alternating current provided by the alternating current power source to obtain the alternating current half cycle of the alternating current comprises: detecting a zero crossing point of alternating current provided by an alternating current power supply to generate a zero crossing detection signal; and acquiring the alternating current half cycle of the alternating current according to the zero-crossing detection signal.
Specifically, zero-crossing points of alternating current supplied by an alternating current power supply are detected to generate zero-crossing detection signals, and an alternating current half cycle is formed between any two adjacent zero-crossing detection signals, for example, as shown in fig. 3a to 3C, a first alternating current half cycle I is formed between the zero-crossing points a and B, a second alternating current half cycle ii is formed between the zero-crossing points B and C, a third alternating current half cycle iii is formed between the zero-crossing point C and the zero-crossing point D, and a fourth alternating current half cycle iv is formed between the zero-crossing point D and the zero-crossing point.
S2: and taking N continuous alternating current half cycles of the alternating current as a heating cycle of the electromagnetic heating cooking system.
Specifically, as shown in fig. 3a-3c, if N is 4, the first to fourth ac half cycles I to iv are taken as a heating cycle of one electromagnetic heating cooking system; as shown in fig. 4a-4b, if N is 5, the first to fifth ac half-cycles I to v are taken as a heating cycle of an induction heating cooking system.
S3: and in each heating period, controlling a heating device of the electromagnetic heating cooking system to continuously heat in M continuous alternating current half periods, and stopping heating in the rest (N-M) sine wave periods so as to adjust the heating power of the heating device, wherein N is an integer greater than or equal to 4, and M is a positive integer smaller than N.
Further, during the heating process, the heating power of the electromagnetic heating cooking system is controlled to be less than or equal to the preset power, such as 1300W.
Specifically, if the heating period of the heating device is N ac half periods, the heating device may be controlled to continue heating for M consecutive ac half periods and stop heating for the remaining (N-M) ac half periods, thereby adjusting the heating power of the heating device by changing the values of M and N. For example, if the heating power of the heating device of the electromagnetic heating cooking system is 1200W for full-wave heating, where full-wave heating means that the heating device continuously heats every ac half-cycle, when the heating device is controlled to continuously heat for M consecutive ac half-cycles and stop heating for the remaining (N-M) ac half-cycles, the heating power of the heating device is 1200M/N, so as to realize different low-power heating by changing the values of M and N.
According to an embodiment of the present invention, as shown in fig. 3a-3c, when N is 4, in each heating period, if the heating device is controlled to continue heating for 2 consecutive alternating current half periods and stop heating for the remaining 2 alternating current half periods, the heating device heats with a heating power of 2/4P, where P is the heating power when the heating device heats in each alternating current half period, i.e., the heating power of full-wave heating; if the heating device is controlled to continuously heat in 1 alternating current half cycle and stops heating in the remaining 3 alternating current half cycles, the heating device heats with 1/4P heating power; if the heating device is controlled to continue heating for 3 consecutive ac half cycles and to stop heating for the remaining 1 ac half cycle, the heating device heats with a heating power of 3/4P.
Specifically, as shown in fig. 3a, if the heating device is controlled to continuously heat for 2 consecutive ac half cycles and stop heating for the remaining 2 ac half cycles, the heating device is controlled to continuously heat for the first ac half cycle I, the second ac half cycle ii, and the heating device is controlled to stop heating for the third ac half cycle iii and the fourth ac half cycle iv, where the heating duty ratio is 2/4. Assuming that the heating power P of the heating device is 1200W when the heating device heats every ac half cycle, the heating power of the heating device will be adjusted when the heating device is controlled to heat at the heating duty ratio of 2/4.
As shown in fig. 3b, if the heating device is controlled to continuously heat in 1 ac half cycle and stop heating in the remaining 3 ac half cycles, the heating device is controlled to continuously heat in the first ac half cycle I, and the heating device is controlled to stop heating in the second ac half cycle ii, the third ac half cycle iii and the fourth ac half cycle iv, where the heating duty ratio is 1/4. Assuming that the heating power P when the heating device heats every alternating current half cycle is 1200W, the heating power of the heating device is 300W when the heating device is controlled to heat according to the heating duty ratio 1/4.
As shown in fig. 3c, if the heating device is controlled to continuously heat for 3 ac half cycles and stop heating for 1 ac half cycle, the heating device is controlled to continuously heat for the first ac half cycle I, the second ac half cycle ii and the third ac half cycle iii, and the heating device is controlled to stop heating for the fourth ac half cycle iv, where the heating duty ratio is 3/4. Assuming that the heating power P when the heating device heats every alternating current half cycle is 1200W, the heating power of the heating device is 900W when the heating device is controlled to heat at the heating duty ratio of 3/4.
According to an embodiment of the present invention, as shown in fig. 4a-4b, when N is 5, in each heating period, if the heating device is controlled to continue heating in 1 ac half cycle and stop heating in the remaining 4 ac half cycles, the heating device heats with a heating power of 1/5P, where P is the heating power when the heating device heats in each ac half cycle; if the heating device is controlled to continue heating for 4 consecutive ac half cycles and to stop heating for the remaining 1 ac half cycle, the heating device heats with a heating power of 4/5P.
Specifically, as shown in fig. 4a, if the heating device is controlled to continuously heat in 1 ac half cycle and stop heating in the remaining 4 ac half cycles, i.e., the heating device is controlled to continuously heat in the first ac half cycle I, and the heating device is controlled to stop heating in the second ac half cycle ii to the fifth ac half cycle v, the heating duty ratio is 1/5. Assuming that the heating power P when the heating device heats every alternating current half cycle is 1200W, the heating power of the heating device is 240W when the heating device is controlled to heat at the heating duty ratio of 1/5.
As shown in fig. 4b, if the heating device is controlled to continuously heat in 4 consecutive ac half cycles and stop heating in the remaining 1 ac half cycle, i.e., the heating device is controlled to continuously heat in the first ac half cycle I to the fourth ac half cycle iv, and the heating device is controlled to stop heating in the fifth ac half cycle v, the heating duty ratio is 4/5. Assuming that the heating power P when the heating device heats every alternating current half cycle is 1200W, the heating device heating power is 960W when the heating device is controlled to heat according to the heating duty ratio of 4/5. As described above, in each heating period, the heating device of the electromagnetic heating cooking system is controlled to continuously heat in M continuous alternating current half periods, and stops heating in the rest (N-M) alternating current half periods, so that the heating power is adjusted by changing the values of M and N, and different low-power heating is realized.
It should be understood that the main circuit of the electromagnetic heating cooking system is an inductive circuit, the longer the heating period of low power heating, the slower the change of the current waveform, and the smaller the value of the generated higher harmonic current, and at the same time, the instantaneous power during heating can be controlled to be 1300W or less, and the current can be reduced appropriately. Therefore, the commutation time in the whole circuit is prolonged, the current in the circuit is small, the change of the current waveform is slow, and the aim of inhibiting harmonic current can be achieved.
In summary, according to the heating control method of the electromagnetic heating cooking system provided by the embodiment of the invention, the alternating current provided by the alternating current power supply is detected to obtain the alternating current half cycle of the alternating current, and taking N continuous alternating current half cycles of the alternating current as a heating cycle of the electromagnetic heating cooking system, in each heating period, the heating device of the electromagnetic heating cooking system is controlled to continuously heat in continuous M alternating current half periods, and stopping heating for the remaining (N-M) alternating current half cycles to adjust the heating power of the heating device, wherein N is an integer of 4 or more and M is a positive integer of less than N, thereby realizing low power heating and reducing instantaneous heating power, meanwhile, by increasing the heating period, the current conversion time of the circuit can be increased, and the change of the current waveform is reduced, so that the harmonic current is reduced, and the safety performance of the electromagnetic heating cooking system is improved.
The invention also provides a heating control device of the electromagnetic heating cooking system.
Fig. 5a is a block schematic diagram of a heating control device of an electromagnetic heating cooking system according to an embodiment of the present invention. As shown in fig. 5a, the heating control device 10 includes: a detection module 1 and a control module 2.
The detection module 1 is used for detecting the alternating current provided by the alternating current power supply to obtain an alternating current half cycle of the alternating current; the control module 2 is connected to the detection module 1, and the control module 2 is configured to use N consecutive ac half cycles of the ac power as heating cycles of the electromagnetic heating cooking system, and in each heating cycle, control the heating device of the electromagnetic heating cooking system to continuously heat M consecutive ac half cycles, and stop heating for the remaining (N-M) ac half cycles, so as to adjust the heating power of the heating device, where N is an integer greater than or equal to 4, and M is a positive integer less than N.
Further, during the heating process, the control module 2 controls the heating power of the electromagnetic heating cooking system to be less than or equal to a preset power, such as 1300W.
If the heating period of the heating device is N ac half periods, the control module 2 may control the heating device to continue heating for M consecutive ac half periods and stop heating for the remaining (N-M) ac half periods, thereby adjusting the heating power of the heating device by changing the values of M and N. For example, if the heating power of the heating device of the electromagnetic heating cooking system is 1200W for full-wave heating, where full-wave heating means that the heating device continuously heats in each ac half-cycle, the control module 2 controls the heating device to continuously heat in M consecutive ac cycles and stops heating in the remaining (N-M) ac half-cycles, the heating power of the heating device is 1200M/N, so that the control module 2 realizes different power heating by changing the values of M and N.
As shown in fig. 5b, the detection module 1 further comprises: the device comprises a zero-crossing detection unit 3 and an acquisition unit 4, wherein the zero-crossing detection unit 3 is used for detecting the zero crossing point of alternating current provided by an alternating current power supply to generate a zero-crossing detection signal; the acquiring unit 4 is used for acquiring an alternating current half cycle of the alternating current according to the zero-crossing detection signal. Specifically, the zero-cross detection unit 3 detects zero-cross points of the alternating current supplied by the alternating current power supply to generate zero-cross detection signals, and an alternating-current half period is provided between any two adjacent zero-cross detection signals, for example, as shown in fig. 3a to 3C, a first alternating-current half period I is provided between the zero-cross points a and B, a second alternating-current half period ii is provided between the zero-cross points B and C, a third alternating-current half period iii is provided between the zero-cross point C and the zero-cross point D, and a fourth alternating-current half period iv is provided between the zero-cross.
According to an embodiment of the present invention, as shown in fig. 3a-3c, when N is 4, in each heating period, if the control module 2 controls the heating device to continue heating for 2 consecutive ac half-cycles and stop heating for the remaining 2 ac half-cycles, the heating device heats with a heating power of 2/4P, where P is the heating power when the heating device heats every ac half-cycle; if the control module 2 controls the heating device to continue heating for 1 ac half cycle and stop heating for the remaining 3 ac half cycles, the heating device heats with a heating power of 1/4P; if the control module 2 controls the heating device to continue heating for 3 consecutive ac half cycles and stop heating for the remaining 1 ac half cycle, the heating device heats with a heating power of 3/4P.
Specifically, as shown in fig. 3a, if the control module 2 controls the heating device to continuously heat for 2 consecutive ac half cycles and stop heating for the remaining 2 ac half cycles, the control module 2 controls the heating device to continuously heat for the first ac half cycle I and the second ac half cycle ii, and controls the heating device to stop heating for the third ac half cycle iii and the fourth ac half cycle iv, where the heating duty ratio is 2/4. Assuming that the heating power P of the heating device is 1200W when the heating device heats every ac half cycle, the heating power of the heating device is 600W when the control module 2 controls the heating device to heat according to the heating duty ratio of 2/4.
As shown in fig. 3b, if the heating device is controlled by the control module 2 to continuously heat in 1 ac half cycle and stop heating in the remaining 3 ac half cycles, the control module 2 controls the heating device to continuously heat in the first ac half cycle I and controls the heating device to stop heating in the second ac half cycle ii, the third ac half cycle iii and the fourth ac half cycle iv, where the heating duty ratio is 1/4. Assuming that the heating power P when the heating device heats every alternating current half cycle is 1200W, the heating power of the heating device is 300W when the heating device is controlled to heat according to the heating duty ratio 1/4.
As shown in fig. 3c, if the heating device is controlled by the control module 2 to continuously heat for 3 ac half cycles and stop heating for 1 ac half cycle, the control module 2 controls the heating device to continuously heat for the first ac half cycle I, the second ac half cycle ii and the third ac half cycle iii, and controls the heating device to stop heating for the fourth ac half cycle iv, where the heating duty ratio is 3/4. Assuming that the heating power P when the heating device heats every alternating current half cycle is 1200W, the heating power of the heating device is 900W when the heating device is controlled to heat at the heating duty ratio of 3/4.
According to another embodiment of the present invention, as shown in fig. 4a-4b, when N is 5, in each heating period, if the control module 2 controls the heating device to continue heating for 1 ac half-cycle and stop heating for the remaining 4 ac half-cycles, the heating device heats with a heating power of 1/5P, where P is the heating power when the heating device heats every ac half-cycle; if the control module 2 controls the heating device to continue heating for 4 consecutive ac half cycles and stop heating for the remaining 1 ac half cycle, the heating device heats with a heating power of 4/5P.
Specifically, as shown in fig. 4a, if the control module 2 controls the heating device to continuously heat in 1 ac half cycle and stop heating in the remaining 4 ac half cycles, the control module 2 controls the heating device to continuously heat in the first ac half cycle I and controls the heating device to stop heating in the second ac half cycle ii to the fifth ac half cycle v, where the heating duty ratio is 1/5. Assuming that the heating power P when the heating device heats every alternating current half cycle is 1200W, the heating power of the heating device is 240W when the heating device is controlled to heat at the heating duty ratio of 1/5.
As shown in fig. 4b, if the control module 2 controls the heating device to continuously heat for 4 consecutive ac half cycles and stop heating for the remaining 1 ac half cycle, the control module 2 controls the heating device to continuously heat for the first ac half cycle I to the fourth ac half cycle iv and controls the heating device to stop heating for the fifth ac half cycle v, where the heating duty ratio is 4/5. Assuming that the heating power P when the heating device heats every alternating current half cycle is 1200W, the heating device heating power is 960W when the heating device is controlled to heat according to the heating duty ratio of 4/5.
As described above, in each heating period, the control module 2 controls the heating device of the electromagnetic heating cooking system to continuously heat for M consecutive ac half-cycles and stop heating for the remaining (N-M) ac half-cycles, so as to adjust the power heating by changing the values of M and N, thereby realizing different low-power heating.
It should be understood that the main circuit of the electromagnetic heating cooking system is an inductive circuit, the longer the heating period of low power heating, the slower the change of the current waveform, and the smaller the value of the generated higher harmonic current, and at the same time, the instantaneous power during heating can be controlled to be 1300W or less, and the current can be reduced appropriately. Therefore, the commutation time in the whole circuit is prolonged, the current in the circuit is small, the change of the current waveform is slow, and the aim of inhibiting harmonic current can be achieved.
In summary, according to the heating control device of the electromagnetic heating cooking system provided by the embodiment of the invention, the detection module detects the alternating current provided by the alternating current power supply to obtain the alternating current half cycle of the alternating current, the control module takes N consecutive alternating current half cycles of the alternating current as the heating cycle of the electromagnetic heating cooking system, and in each heating cycle, controls the heating device of the electromagnetic heating cooking system to continuously heat M consecutive alternating current half cycles, and stops heating in the remaining (N-M) alternating current half cycles to adjust the heating power of the heating device, wherein N is an integer greater than or equal to 4, and M is a positive integer less than N, thereby realizing low-power heating and reducing instantaneous heating power, and by increasing the heating cycle, the commutation time of the circuit can be increased, and the change of the current waveform can be reduced, thereby reducing harmonic current in the circuit and improving the safety performance of the electromagnetic heating cooking system.
The invention further provides an electromagnetic heating cooking system.
Fig. 6 is a schematic circuit diagram of an electromagnetic heating cooking system according to an embodiment of the present invention. As shown in fig. 6, the electromagnetic heating cooking system includes a heating control device 10.
As shown in fig. 6, the electromagnetic heating cooking system further includes an EMC (Electro Magnetic Compatibility) module 3, a rectifying module 4, a filtering module 5, a resonance module 6, and a power switch 7.
The first input end of the EMC module 3 is connected with one end L of an alternating current power supply, the second input end of the EMC module 3 is connected with the other end N of the alternating current power supply, and the EMC module 3 is used for avoiding high-frequency interference or lightning interference in the alternating current power supply; a first input end and a second input end of the rectifying module 4 are respectively connected with a first output end and a second output end of the EMC module 3, and the rectifying module 4 is used for converting alternating current provided by an alternating current power supply into direct current; the filter module 5 comprises a filter inductor L0 and a filter capacitor C0, and one end of the filter inductor L0 is connected with the output end of the rectifier module 4; the resonance module 6 comprises a resonance capacitor C1 and a resonance inductor L1 which are connected in parallel, one end of the resonance capacitor C1 and one end of the resonance inductor L1 which are connected in parallel are connected with the other end of the filter inductor L0, the other end of the resonance capacitor C1 and the other end of the resonance inductor L1 which are connected in parallel are connected with a collector electrode of the power switch tube 7, and the resonance module 6 is used for performing resonance heating on the cookware; the grid of the power switch tube 7 is connected with the heating control device 10.
According to an embodiment of the present invention, the electromagnetic heating cooking system may be an induction cooker, an electromagnetic rice cooker or an electromagnetic pressure cooker.
In summary, according to the electromagnetic heating cooking system provided by the embodiment of the invention, the heating control device of the electromagnetic heating cooking system of the embodiment can balance the load current of the positive and negative half cycles of the power supply in the whole heating period, thereby reducing the harmonic current in the circuit, reducing the potential safety hazard and improving the user experience.
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 cooking system is characterized by comprising the following steps:
detecting alternating current provided by an alternating current power supply to obtain an alternating current half cycle of the alternating current;
taking N continuous alternating current half cycles of the alternating current as a heating cycle of the electromagnetic heating cooking system;
and in each heating period, controlling the heating device of the electromagnetic heating cooking system to continuously heat in M continuous alternating current half periods, and stopping heating in the rest (N-M) alternating current half periods to adjust the heating power of the heating device, wherein N is an integer greater than or equal to 4, and M is a positive integer less than N.
2. The heating control method of the electromagnetic heating cooking system according to claim 1, wherein detecting the alternating current supplied from the alternating current power supply to obtain the alternating current half cycle of the alternating current comprises:
detecting a zero-crossing point of alternating current provided by the alternating current power supply to generate a zero-crossing detection signal;
and acquiring an alternating current half cycle of the alternating current according to the zero-crossing detection signal.
3. The heating control method of the induction heating cooking system according to claim 1, wherein when N-4, in each heating period,
if the heating device is controlled to continuously heat in 2 continuous alternating current half cycles and stops heating in the remaining 2 alternating current half cycles, the heating device heats with 2/4P of heating power, wherein P is the heating power when the heating device heats in each alternating current half cycle;
if the heating device is controlled to continuously heat in 1 alternating current half cycle and stops heating in the remaining 3 alternating current half cycles, the heating device heats with 1/4P heating power;
if the heating device is controlled to continue heating for 3 consecutive ac half cycles and stop heating for the remaining 1 ac half cycle, the heating device heats with a heating power of 3/4P.
4. The heating control method of the induction heating cooking system according to claim 1, wherein when N-5, in each heating period,
if the heating device is controlled to continue heating for 1 AC half cycle and stop heating for the remaining 4 AC half cycles, the heating device heats with a heating power of 1/5P, where P is the heating power of the heating device when heating is performed every AC half cycle;
if the heating device is controlled to continue heating for 4 consecutive ac half cycles and stop heating for the remaining 1 ac half cycle, the heating device heats with a heating power of 4/5P.
5. A heating control device of an electromagnetic heating cooking system, comprising:
the detection module is used for detecting the alternating current provided by the alternating current power supply to obtain an alternating current half cycle of the alternating current;
and the control module is connected with the detection module and is used for taking N continuous alternating-current half periods of the alternating current as heating periods of the electromagnetic heating cooking system, controlling a heating device of the electromagnetic heating cooking system to continuously heat in M continuous alternating-current half periods and stopping heating in the rest (N-M) alternating-current half periods in each heating period so as to adjust the heating power of the heating device, wherein N is an integer greater than or equal to 4, and M is a positive integer less than N.
6. The heating control device of the electromagnetic heating cooking system according to claim 5, wherein the detection module further comprises:
a zero-crossing detection unit for detecting a zero-crossing point of the alternating current supplied from the alternating current power supply to generate a zero-crossing detection signal;
and the acquisition unit is used for acquiring the alternating current half cycle of the alternating current according to the zero-crossing detection signal.
7. The heating control device of the electromagnetic heating cooking system according to claim 5, wherein when N-4, in each heating period,
if the control module controls the heating device to continuously heat for 2 continuous alternating current half cycles and stop heating for the remaining 2 alternating current half cycles, the heating device heats with 2/4P of heating power, wherein P is the heating power when the heating device heats every alternating current half cycle;
if the control module controls the heating device to continue heating for 1 AC half-cycle and stop heating for the remaining 3 AC half-cycles, the heating device heats with a heating power of 1/4P;
if the control module controls the heating device to continue heating for 3 consecutive ac half cycles and stop heating for the remaining 1 ac half cycle, the heating device heats with a heating power of 3/4P.
8. The heating control device of the electromagnetic heating cooking system according to claim 5, wherein when N-5, in each heating period,
if the control module controls the heating device to continue heating for 1 AC half-cycle and stop heating for the remaining 4 AC half-cycles, the heating device heats with a heating power of 1/5P, where P is the heating power of the heating device when heating is performed every AC half-cycle;
if the control module controls the heating device to continue heating for 4 consecutive ac half cycles and stop heating for the remaining 1 ac half cycle, the heating device heats with a heating power of 4/5P.
9. An electromagnetic heating cooking system, characterized by comprising a heating control device of the electromagnetic heating cooking system according to any one of claims 5 to 8.
10. The electromagnetic heating cooking system of claim 9, wherein the electromagnetic heating cooking system is an induction cooker, an electromagnetic rice cooker, or an electromagnetic pressure cooker.
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| CN107302809B (en) * | 2016-08-18 | 2020-12-22 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking system and heating control device and control method thereof |
| CN110941204A (en) * | 2019-11-19 | 2020-03-31 | 中山市精体电子科技有限公司 | Cooking machine control system with two-dimensional code scanning function |
| CN115494894B (en) * | 2022-07-20 | 2024-01-16 | 烯旺新材料科技股份有限公司 | Temperature control method of electric heating assembly |
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| CN204810577U (en) * | 2015-07-29 | 2015-11-25 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and current detection and protection controlling means thereof |
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| US3651753A (en) * | 1969-09-17 | 1972-03-28 | Intertrade Warenverkehrsgesell | Electric cooker with automatic current control |
| US4897518A (en) * | 1987-03-06 | 1990-01-30 | Tocco, Inc. | Method of monitoring induction heating cycle |
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