CN111988876B - Electromagnetic heating circuit, electromagnetic heating device, drive control method, and heating control method - Google Patents
Electromagnetic heating circuit, electromagnetic heating device, drive control method, and heating control method Download PDFInfo
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- CN111988876B CN111988876B CN201910423061.1A CN201910423061A CN111988876B CN 111988876 B CN111988876 B CN 111988876B CN 201910423061 A CN201910423061 A CN 201910423061A CN 111988876 B CN111988876 B CN 111988876B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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Abstract
The invention provides an electromagnetic heating circuit, an electromagnetic heating device, a driving control method and a heating control method, wherein the electromagnetic heating circuit comprises: a switching tube; the drive circuit is connected with the switching tube and used for receiving the carrier signal and driving the switching tube to change the conduction state according to the carrier signal; the enabling circuit is connected with the driving circuit and used for receiving an enabling signal and controlling the driving voltage of the switching tube according to the enabling signal; the controller is connected with the driving circuit and the enabling circuit and is used for outputting a carrier signal; and acquiring an electric signal input by the power grid, and outputting an enable signal according to the electric signal. The technical scheme provided by the invention reduces the leading amount of current, the working voltage and the working current are in the same phase, the harmonic current is effectively reduced, the voltage flicker is prevented, the noise generated by the change of the duty ratio is further solved, the damage of a switching tube is prevented, and the electromagnetic compatibility and the reliability of the product are improved.
Description
Technical Field
The invention relates to the technical field of electromagnetic heating, in particular to an electromagnetic heating circuit, an electromagnetic heating device, a driving control method, a heating control method, a computer device and a computer readable storage medium.
Background
Generally, an LC resonance circuit is generally adopted in the heating principle of an induction cooker, and a direct current is inverted into a high-frequency, high-voltage and large-current alternating current by switching an IGBT (Insulated Gate Bipolar Transistor), so that a pot generates an eddy current to heat the pot.
However, since the LC resonance parameter of the conventional induction cooker is fixed, the leading voltage is high at low power, and thus the conventional induction cooker cannot be applied to continuous heating at low power of 1000W or less and ultra-low power of 500W or less for a long time. When low power is needed, the conventional induction cooker heats at a higher power according to a duty ratio, for example, when 600W is needed, the conventional induction cooker heats at a duty ratio of 3/6, which is when heating for 3 seconds and stopping for 3 seconds, according to 1200W, and when the duty ratio is changed at a faster frequency, the current and the voltage generate a larger phase deviation, a larger harmonic current is generated, noise is generated, and user experience is affected.
Disclosure of Invention
The present invention has been made to solve at least one of the problems occurring in the prior art or the related art.
To this end, a first aspect of the invention proposes an electromagnetic heating circuit.
A second aspect of the present invention proposes an electromagnetic heating apparatus.
A third aspect of the invention proposes a drive control method.
A fourth aspect of the invention provides a heating control method.
A fifth aspect of the present invention provides a computer apparatus.
A sixth aspect of the invention is directed to a computer-readable storage medium.
In view of the above, a first aspect of the present invention provides an electromagnetic heating circuit, including a coil and a resonant capacitor connected in parallel to the coil, the electromagnetic heating circuit further including: a switching tube; the drive circuit is connected with the switching tube and used for receiving the carrier signal and driving the switching tube to change the conduction state according to the carrier signal; the enabling circuit is connected with the driving circuit and used for receiving an enabling signal and controlling the driving voltage of the switching tube according to the enabling signal; the controller is connected with the driving circuit and the enabling circuit and is used for outputting a carrier signal; and acquiring an electric signal input by the power grid, and outputting an enable signal according to the electric signal.
In the technical scheme, the electromagnetic heating circuit comprises a plurality of resonant circuits, a driving circuit, an enabling circuit and a controller; wherein resonance circuit includes coil, resonance electric capacity and switch tube, and the on-off state through the switch tube makes coil and resonance electric capacity constitute LC resonance circuit, and then makes the pan produce the vortex so that make the pan generate heat. The driving circuit is connected with the switching tube and used for controlling the conduction state of the switching tube according to the carrier signal output by the controller. Meanwhile, the controller collects the electric signals of the power grid, correspondingly outputs an enabling signal according to the electric signals of the power grid, and controls the driving voltage applied to the switch tube through the enabling signal, so that the phase deviation of current and voltage is reduced while the duty ratio is changed, namely, the wave is lost, and the harmonic current is reduced.
By applying the technical scheme provided by the invention, the enabling circuit is arranged in the electromagnetic heating circuit, when the electromagnetic heating circuit operates at low power, namely the duty ratio of the carrier circuit is low, the corresponding enabling signal is output to the driving circuit, so that the driving voltage of the switching tube is reduced, the leading quantity of current is further reduced, the working voltage and the working current are in the same phase, the amplitude of harmonic current is effectively reduced, the voltage flicker is prevented from being generated, the noise problem caused by the change of the duty ratio is further solved, the damage of the switching tube is prevented, and the electromagnetic compatibility of the product and the reliability of the product are improved.
Specifically, the carrier signal output by the controller is a PWM (Pulse Width Modulation) signal, the switching tube is an IGBT switching tube, optionally, the driving voltage of the IGBT switching tube under a general condition is 18V, when the electromagnetic heating circuit operates at a low power, the enabling circuit starts to operate, the controller outputs an enabling signal when detecting a zero crossing point of an electric signal of the power grid, controls a triode in the enabling circuit to be turned on, and at this time, a voltage dividing resistor in the enabling circuit is connected to the driving circuit to divide the voltage, so as to limit the driving voltage of the IGBT switching tube to a low voltage value. Optionally, when the enabling circuit is enabled, the driving voltage of the IGBT switching tube is 9V.
In addition, the electromagnetic heating circuit in the above technical solution provided by the present invention may further have the following additional technical features:
in the above technical solution, further, the controller includes an enable signal output port, and the enable circuit includes: one end of the first resistive element is connected with the enabling signal output port, and the other end of the first resistive element is connected with the base electrode of the first triode; the collector of the first triode is connected with one end of the second resistive element, and the emitter of the first triode is grounded; and the other end of the second resistive element is connected with the driving circuit.
In this solution, the controller includes an enable signal output port for outputting an enable signal. The enabling circuit includes a first resistive element, a second resistive element, and a first triode. The enabling signal output by the controller controls the conduction state of the first triode, and when the first triode is conducted, the second resistive element is connected to the driving circuit to start voltage division, so that the driving voltage of the switching tube is reduced.
In any one of the above technical solutions, further, the controller includes an electrical signal acquisition port, and the electromagnetic heating circuit further includes: the input end of the synchronous circuit is connected with the resonant capacitor in parallel, the output end of the synchronous circuit is connected with the electric signal acquisition port, and the synchronous circuit is used for synchronously transmitting the electric signal applied to the resonant capacitor to the controller so that the controller generates an enabling signal according to the electric signal.
In the technical scheme, the electromagnetic heating circuit comprises a synchronization circuit, the synchronization circuit synchronously transmits electric signals at two ends of the resonance capacitor, namely the electric signals input by the power grid, to an electric signal acquisition port of the controller, so that the controller can synchronously acquire the electric signals input by the power grid, an enabling signal is generated according to the electric signals, and the accuracy of the enabling signal is improved.
In any of the above technical solutions, further, the controller is specifically configured to: the method comprises the steps that an enabling signal is output when an electric signal zero crossing point is detected, so that a first triode is conducted, and the driving voltage of a switching element is driven by low voltage; the voltage amplitude of the enabling signal is larger than the conducting voltage value of the first triode.
In the technical scheme, the controller synchronously outputs an enabling signal when the detected electric signal of the power grid crosses zero, wherein the voltage amplitude of the enabling signal is larger than the conduction voltage value of the first triode, when the enabling signal is output, the triode is conducted, at the moment, the second resistive element is connected into the driving control circuit and starts to divide voltage, and the driving voltage applied to the switching tube by the driving control circuit is reduced. Optionally, when the electromagnetic heating circuit operates at a higher power, the enabling circuit does not operate, and the driving voltage of the switching tube is 18V. When the electromagnetic heating circuit works at lower power, the enabling circuit works, an enabling signal is output when the electric signal of the power grid crosses the zero point, the first triode is conducted, and the driving voltage of the switching tube is 9V after the voltage of the second resistor is divided.
In any of the above technical solutions, further, the driving circuit includes: a base electrode of the second triode is connected with the enabling circuit, an emitting electrode of the second triode is connected with one end of the third resistive element, and a collecting electrode of the second triode is connected with an emitting electrode of the switching tube; a base electrode of the third triode is connected with the controller and used for receiving the carrier signal, an emitting electrode of the third triode is connected with the other end of the third resistive element, and a collecting electrode of the third triode is connected with the power supply source; and one end of the fourth resistive element is connected with the other end of the third resistive element, and the other end of the fourth resistive element is connected with the gate electrode of the switching tube.
In the technical scheme, the driving circuit comprises a second triode and a third triode, optionally, the switching tube is an IGBT switching tube, the second triode is a triode with a PNP structure, the third triode is a triode with an NPN structure, the second triode and the third triode form a totem pole driving circuit, and a carrier signal output by the controller is transmitted to a gate pole of the IGBT switching tube to drive the IGBT switching tube to work.
A second aspect of the present invention provides an electromagnetic heating apparatus, where the electromagnetic heating apparatus includes the electromagnetic heating circuit provided in any one of the above technical solutions, and therefore, the electromagnetic heating apparatus includes all the beneficial effects of the electromagnetic heating circuit provided in any one of the above technical solutions, which are not described herein again.
A third aspect of the present invention provides a drive control method for an electromagnetic heating circuit provided in any one of the above-described aspects, the drive control method including: receiving a target duty ratio and acquiring an electric signal input by a power grid; determining a target modulation period according to the rectification period of the electric signal; determining a modulation duty ratio in a target modulation period according to the target duty ratio; and determining a target carrier signal according to the modulation duty ratio, and controlling the electromagnetic heating circuit through the target carrier signal.
In the technical scheme, when the electromagnetic heating circuit needs to be controlled to work at a lower power, the target working power set by a user is received firstly, the target duty ratio of the driving signal output by the corresponding driving circuit is obtained according to the target working power, and meanwhile, the electric signal input by the power grid is obtained. The electric signal, namely the rectification period of the commercial power, can be determined according to the electric signal input by the power grid, and the target modulation period is determined according to the rectification period. Wherein, a modulation period comprises a plurality of rectification periods of the electric network signal. The modulation duty ratio in the target modulation period is determined according to the target duty ratio, wherein the target modulation period comprises a plurality of rectification periods of the power grid, namely the modulation period can comprise a plurality of modulation sub-periods, when the duty ratio is reduced, the duty ratios of the modulation sub-periods are sequentially reduced to adjust the duty ratio of the whole carrier signal, high-frequency adjustment of the duty ratio is further achieved, second-level duty ratio adjustment is improved to millisecond-level duty ratio adjustment, wave loss frequency is improved, the fluctuation range of heating temperature control is narrowed, accurate constant temperature control is achieved, harmonic current components are effectively reduced, and electromagnetic compatibility is improved.
In the above technical solution, further, the target modulation period includes at least two sub-modulation periods, and the step of determining the modulation duty ratio in the target modulation period according to the target duty ratio specifically includes: determining sub-modulation duty ratios corresponding to the sub-modulation periods respectively according to the target duty ratios; the periods of any two sub-modulation periods are the same, and the average value of all the sub-modulation duty ratios is equal to the duty ratio value of the target duty ratio.
In the technical scheme, the target modulation period includes at least two sub-modulation periods, optionally, each sub-modulation period is 2 rectification periods of the power grid electrical signal, taking a domestic power grid as an example, the power grid frequency is 50Hz, and thus one sub-modulation period is 40 ms. The sub-modulation duty ratio corresponding to each sub-modulation period is set independently, and taking the modulation period including 2 sub-modulation periods and the duty ratio for achieving the target duty ratio of 5/8 as an example, the sub-duty ratio corresponding to the first sub-modulation period is adjusted to 3/4, the sub-duty ratio corresponding to the second sub-modulation period is adjusted to 2/4, and the finally obtained average duty ratio in the modulation period, that is, the modulation duty ratio is 5/8, which is the same as the target duty ratio.
A fourth aspect of the present invention provides a heating control method for an electromagnetic heating apparatus provided in any one of the above technical solutions, the heating control method including: acquiring the number of heating cycles currently accumulated; the heating period number is smaller than the target heating period number, and the duty ratio corresponding to the current heating period is obtained; based on the duty cycle being less than the duty cycle threshold, the current heating cycle is performed.
In the technical scheme, the heating device acquires the current accumulated heating period number in real time in the heating process, and judges whether the current accumulated heating period number reaches the target heating period number. And if the number of the current accumulated heating cycles reaches the target number of the heating cycles, finishing heating and controlling the electromagnetic heating device to stop heating. If the number of the current accumulated heating cycles does not reach the target number of the heating cycles, further judging whether the duty ratio of the carrier signal corresponding to the current heating cycle is larger than a preset duty ratio threshold value, if the duty ratio of the carrier signal corresponding to the current heating cycle is larger than or equal to the duty ratio threshold value, skipping the current heating cycle, and not heating in the current heating cycle. And if the duty ratio of the carrier signal corresponding to the current heating period is smaller than the duty ratio threshold value, heating is performed in the current heating period. Whether heating is finished or not is judged by comparing the accumulated heating period number with the target heating period number, and compared with the method that whether heating is finished or not is judged through heating time, more accurate control can be realized.
In the above technical solution, further, the heating control method further includes: the number of heating cycles is set to zero based on the number of heating cycles being greater than or equal to the target number of heating cycles.
In the technical scheme, when the heating period number is greater than or equal to the target heating period number, the heating process is completed, the electromagnetic heating device is controlled to stop heating, and meanwhile, the accumulated heating period number is set to be zero. Optionally, during the heating process, the duty ratio of the carrier signal may change cyclically along with the heating process, and the changing order is: duty cycle is 0, duty cycle is 1, duty cycle is 2 and duty cycle is 3, the 4 duty cycles described above. After the heating process is finished, if the duty ratio is greater than 2, that is, the duty ratio is 3, the duty ratio is set to 0.
A fifth aspect of the present invention provides a computer apparatus, including a memory and a processor, where the memory is used to store a computer program, and the processor is used to execute the computer program to implement the driving control method and/or the heating control method provided in any of the above technical solutions, and therefore, the computer apparatus includes all the beneficial effects of the driving control method and/or the heating control method provided in any of the above technical solutions, which are not described herein again.
A sixth aspect of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements: the driving control method and/or the heating control method provided in any of the above technical solutions, therefore, the computer-readable storage includes all the beneficial effects of the driving control method and/or the heating control method provided in any of the above technical solutions, and details are not repeated herein.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic structural diagram of an electromagnetic heating circuit according to an embodiment of the present invention;
fig. 2 shows a flow chart of a drive control method according to an embodiment of the invention;
fig. 3 illustrates a waveform diagram of duty ratio adjustment in a driving control method according to an embodiment of the present invention;
FIG. 4 shows a flow diagram of a heating control method according to an embodiment of the invention;
FIG. 5 shows a flow chart of a heating control method according to another embodiment of the invention;
FIG. 6 shows a block diagram of a computer device, according to an embodiment of the invention.
Wherein, the corresponding relationship between the reference numbers and the component names in fig. 1 is:
102 switching tube, 104 driving circuit, 106 enabling circuit, 108 synchronizing circuit and 110 controller.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention, taken in conjunction with the accompanying drawings and detailed description, is set forth below. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein and, therefore, the scope of the present invention is not limited by the specific embodiments disclosed below.
The electromagnetic heating circuit, the electromagnetic heating apparatus, the drive control method, the heating control method, the computer apparatus, and the computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 6.
In an embodiment of the first aspect of the present invention, as shown in fig. 1, there is provided an electromagnetic heating circuit comprising a coil and a resonant capacitor connected in parallel with the coil, the electromagnetic heating circuit further comprising: a switching tube 102; the driving circuit 104 is connected with the switching tube 102, and the driving circuit 104 is used for receiving a carrier signal and driving the switching tube 102 to change a conducting state according to the carrier signal; the enable circuit 106, the enable circuit 106 is connected to the driving circuit 104, and the enable circuit 106 is configured to receive an enable signal and control a driving voltage of the switching tube 102 according to the enable signal; a controller 110 connected to the driving circuit 104 and the enabling circuit 106, the controller 110 being configured to output a carrier signal; and acquiring an electric signal input by the power grid, and outputting an enable signal according to the electric signal.
In this embodiment, the electromagnetic heating circuit includes resonant circuits, a drive circuit 104, an enable circuit 106, and a controller 110; wherein resonant circuit includes coil, resonance electric capacity and switch tube 102, makes coil and resonance electric capacity constitute LC resonant circuit through the on-off state of switch tube 102, and then makes the pan produce the vortex so that the pan generates heat. The driving circuit 104 is connected to the switching tube 102, and is configured to control a conducting state of the switching tube 102 according to the carrier signal output by the controller 110. Meanwhile, the controller 110 collects the electrical signals of the power grid, correspondingly outputs an enable signal according to the electrical signals of the power grid, and controls the driving voltage applied to the switching tube 102 through the enable signal, so that the phase deviation of the current and the voltage is reduced while the duty ratio is changed, namely, the wave is lost, and the harmonic current is reduced.
In the embodiment of the present invention, the enable circuit 106 is disposed in the electromagnetic heating circuit, and when the electromagnetic heating circuit operates at low power, that is, when the duty ratio of the carrier circuit is low, the corresponding enable signal is output to the driving circuit 104, so that the driving voltage of the switching tube 102 is reduced, the leading amount of the current is reduced, the working voltage and the working current are in phase, the amplitude of the harmonic current is effectively reduced, the voltage flicker is prevented, the noise problem caused by the change of the duty ratio is solved, and the electromagnetic compatibility and the reliability of the product are improved while the switching tube 102 is prevented from being damaged.
Specifically, the carrier signal output by the controller 110 is a PWM (Pulse Width Modulation) signal, the switch tube 102 is an IGBT, and optionally, the drive voltage of the IGBT under a general condition is 18V, when the electromagnetic heating circuit operates at a lower power, the enable circuit 106 starts to operate, and when the controller 110 detects a zero crossing point of the grid electrical signal, the controller outputs an enable signal to control a transistor in the enable circuit 106 to be turned on, at this time, a voltage dividing resistor in the enable circuit 106 is connected to the drive circuit 104 to divide the voltage, so as to limit the drive voltage of the IGBT switch tube at a lower voltage value. Optionally, when the enable circuit 106 is enabled, the driving voltage of the IGBT switch tube is 9V.
In an embodiment of the present invention, further, the controller 110 includes an enable signal output port, and the enable circuit 106 includes: one end of the first resistive element R1 is connected with the enable signal output port, and the other end of the first resistive element R1 is connected with the base electrode of the first triode; a first triode D1, wherein the collector of the first triode D1 is connected with one end of the second resistive element R2, and the emitter of the first triode D1 is grounded; the other end of the second resistive element R2 is connected to the driver circuit 104, and the second resistive element R2 is connected to the driver circuit.
In this embodiment, the controller 110 includes an enable signal output port for outputting an enable signal. The enable circuit 106 includes a first resistive element R1, a second resistive element R2, and a first transistor D1. The enable signal output by the controller 110 controls the conducting state of the first transistor D1, and when the first transistor D1 is conducting, the second resistive element R2 is connected to the driving circuit 104 to start voltage division, thereby reducing the driving voltage of the switching tube 102.
In an embodiment of the present invention, further, the controller 110 includes an electrical signal acquisition port, and the electromagnetic heating circuit further includes: the input end of the synchronous circuit 108 is connected in parallel with the resonant capacitor, the output end of the synchronous circuit 108 is connected with the electric signal acquisition port, and the synchronous circuit 108 is used for synchronously transmitting the electric signal applied to the resonant capacitor to the controller 110, so that the controller 110 generates an enable signal according to the electric signal.
In this embodiment, the electromagnetic heating circuit includes the synchronization circuit 108, and the synchronization circuit 108 transmits the electrical signals at the two ends of the resonant capacitor, that is, the electrical signals input by the power grid, to the electrical signal acquisition port of the controller 110 in synchronization, so that the controller 110 can acquire the electrical signals input by the power grid in synchronization, and further generate the enable signal according to the electrical signals, thereby improving the accuracy of the enable signal.
In an embodiment of the present invention, further, the controller 110 is specifically configured to: outputting an enable signal when the zero crossing point of the electric signal is detected so as to enable the first triode D1 to be conducted, wherein the driving voltage of the switching element is low-voltage driving; the voltage amplitude of the enable signal is greater than the conduction voltage value of the first triode D1.
In this embodiment, the controller 110 synchronously outputs an enable signal when the detected zero-crossing point of the grid electrical signal is zero, wherein the voltage amplitude of the enable signal is greater than the conducting voltage value of the first transistor D1, and when the enable signal is output, the transistor is turned on, and at this time, the second resistive element R2 is connected to the driving control circuit and starts to divide the voltage, so that the driving voltage applied to the switching tube 102 by the driving control circuit is reduced. Alternatively, when the electromagnetic heating circuit operates at a higher power, the enabling circuit 106 does not operate, and the driving voltage of the switching tube 102 is 18V. When the electromagnetic heating circuit works at a low power, the enabling circuit 106 works, an enabling signal is output when the electric signal of the power grid crosses zero, the first triode D1 is conducted, and the driving voltage of the switching tube 102 is 9V after the second resistor divides the voltage.
In an embodiment of the present invention, further, the driving circuit 104 includes: a second triode D2, wherein the base of the second triode D2 is connected to the enable circuit 106, the emitter of the second triode D2 is connected to one end of the third resistive element R3, and the collector of the second triode D2 is connected to the emitter of the switching tube 102; a third triode D3, a base of the third triode D3 is connected with the controller 110 for receiving a carrier signal, an emitter of the third triode D3 is connected with the other end of the third resistive element R3, and a collector of the third triode D3 is connected with a power supply; and a fourth resistive element R4, one end of the fourth resistive element R4 being connected to the other end of the third resistive element R3, and the other end of the fourth resistive element R4 being connected to the gate of the switching tube 102.
In this embodiment, the driving circuit 104 includes a second transistor D2 and a third transistor D3, and optionally, the switching tube 102 is an IGBT switching tube, the second transistor D2 is a PNP transistor, the third transistor D3 is an NPN transistor, and the second transistor D2 and the third transistor D3 form the totem pole driving circuit 104, and transmit the carrier signal output by the controller 110 to a gate of the IGBT switching tube to drive the IGBT switching tube to operate.
In an embodiment of the second aspect of the present invention, an electromagnetic heating apparatus is provided, where the electromagnetic heating apparatus includes the electromagnetic heating circuit provided in any one of the above embodiments, and therefore, the electromagnetic heating apparatus includes all the beneficial effects of the electromagnetic heating circuit provided in any one of the above embodiments, and details are not described here again.
As shown in fig. 2 and 3, in an embodiment of a third aspect of the present invention, there is provided a drive control method for an electromagnetic heating circuit provided in any one of the above embodiments, the drive control method including:
s202, receiving a target duty ratio and acquiring an electric signal input by a power grid;
s204, determining a target modulation period according to the rectification period of the electric signal;
s206, determining a modulation duty ratio in a target modulation period according to the target duty ratio;
and S208, determining a target carrier signal according to the modulation duty ratio, and controlling the electromagnetic heating circuit through the target carrier signal.
In this embodiment, when the electromagnetic heating circuit needs to be controlled to operate at a lower power, a target operating power set by a user is received first, a target duty ratio of a driving signal output by a corresponding driving circuit is obtained according to the target operating power, and an electrical signal input by a power grid is obtained at the same time. The electric signal, namely the rectification period of the commercial power, can be determined according to the electric signal input by the power grid, and the target modulation period is determined according to the rectification period. Wherein, a modulation period comprises a plurality of rectification periods of the electric network signal. The modulation duty ratio in the target modulation period is determined according to the target duty ratio, wherein the target modulation period comprises a plurality of rectification periods of the power grid, namely the modulation period can comprise a plurality of modulation sub-periods, when the duty ratio is reduced, the duty ratios of the modulation sub-periods are sequentially reduced to adjust the duty ratio of the whole carrier signal, high-frequency adjustment of the duty ratio is further achieved, second-level duty ratio adjustment is improved to millisecond-level duty ratio adjustment, wave loss frequency is improved, the fluctuation range of heating temperature control is narrowed, accurate constant temperature control is achieved, harmonic current components are effectively reduced, and electromagnetic compatibility is improved.
In an embodiment of the present invention, as shown in fig. 3, the target modulation period includes at least two sub-modulation periods, and the step of determining the modulation duty ratio in the target modulation period according to the target duty ratio specifically includes: determining sub-modulation duty ratios corresponding to the sub-modulation periods respectively according to the target duty ratios; the periods of any two sub-modulation periods are the same, and the average value of all the sub-modulation duty ratios is equal to the duty ratio value of the target duty ratio.
In this embodiment, the target modulation period includes at least two sub-modulation periods, and optionally, each sub-modulation period is 2 rectification periods of the grid electrical signal, for example, the domestic grid, and the grid frequency is 50Hz, so that one sub-modulation period is 40 ms. As shown in fig. 3, the modulation period includes 2 sub-modulation periods, the target duty ratio is 5/8, each sub-period corresponds to 4 rectification periods, the sub-duty ratio corresponding to the first sub-modulation period is adjusted to 3/4, the sub-duty ratio corresponding to the second sub-modulation period is adjusted to 2/4, and the finally obtained average duty ratio in the modulation period, that is, the modulation duty ratio is 5/8, which is the same as the target duty ratio.
In an embodiment of a fourth aspect of the present invention, as shown in fig. 4, there is provided a heating control method for an electromagnetic heating apparatus provided in any one of the above embodiments, the heating control method including:
s402, acquiring the number of the heating cycles currently accumulated;
s404, acquiring a duty ratio corresponding to the current heating period, wherein the heating period number is less than the target heating period number;
and S406, executing the current heating period based on the duty ratio smaller than the duty ratio threshold value.
In this embodiment, the heating apparatus obtains the current accumulated number of heating cycles in real time during the heating process, and determines whether the current accumulated number of heating cycles reaches the target number of heating cycles. And if the number of the current accumulated heating cycles reaches the target number of the heating cycles, finishing heating and controlling the electromagnetic heating device to stop heating. If the number of the current accumulated heating cycles does not reach the target number of the heating cycles, further judging whether the duty ratio of the carrier signal corresponding to the current heating cycle is larger than a preset duty ratio threshold value, if the duty ratio of the carrier signal corresponding to the current heating cycle is larger than or equal to the duty ratio threshold value, skipping the current heating cycle, and not heating in the current heating cycle. And if the duty ratio of the carrier signal corresponding to the current heating period is smaller than the duty ratio threshold value, heating is executed in the current heating period. Whether heating is finished or not is judged by comparing the accumulated heating period number with the target heating period number, and compared with the method that whether heating is finished or not is judged through heating time, more accurate control can be realized.
In an embodiment of the present invention, further, the heating control method further includes: the number of heating cycles is set to zero based on the number of heating cycles being greater than or equal to the target number of heating cycles.
In this embodiment, when the number of heating cycles is greater than or equal to the target number of heating cycles, the heating process is completed, and the electromagnetic heating device is controlled to stop heating, and the cumulative number of heating cycles is set to zero. Optionally, during the heating process, the duty ratio of the carrier signal may change cyclically along with the heating process, and the changing order is: duty cycle is 0, duty cycle is 1, duty cycle is 2 and duty cycle is 3, the 4 duty cycles described above. After the heating process is finished, if the duty ratio is greater than 2, that is, the duty ratio is 3, the duty ratio is set to 0.
In one embodiment of the present invention, as shown in fig. 5, the heating control flow is specifically:
s502, judging whether the current accumulated heating period number is larger than the target heating period number or not; if the judgment result is yes, the process proceeds to S508, and if the judgment result is no, the process proceeds to S504;
s504, judging whether the duty ratio corresponding to the current heating period is smaller than a duty ratio threshold value; if the judgment result is yes, the process proceeds to S506, and if the judgment result is no, the process is ended;
s506, executing the current heating cycle;
s508, setting the number of the current accumulated heating cycles to zero;
s510, judging whether the current duty ratio is larger than 2; if the judgment result is yes, the step S512 is entered, and if the judgment result is no, the step is ended;
and S512, setting the current duty ratio to be zero.
As shown in fig. 6, in an embodiment of the fifth aspect of the present invention, a computer apparatus 600 is provided, which includes a memory 602 and a processor 604, where the memory 602 is configured to store a computer program, and the processor 604 is configured to execute the computer program to implement the driving control method and/or the heating control method provided in any of the above embodiments, and therefore, the computer apparatus 600 includes all the beneficial effects of the driving control method and/or the heating control method provided in any of the above embodiments, which are not described herein again.
In an embodiment of the sixth aspect of the present invention, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements: the driving control method and/or the heating control method provided in any of the above embodiments, therefore, the computer readable storage includes all the advantages of the driving control method and/or the heating control method provided in any of the above embodiments, and details are not repeated herein.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically defined, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. 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 description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means 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 present invention. In the present invention, the schematic representations of the terms used above do not necessarily 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.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. An electromagnetic heating circuit comprising a coil and a resonant capacitor connected in parallel with the coil, the electromagnetic heating circuit further comprising:
a switching tube;
the driving circuit is connected with the switching tube and used for receiving a carrier signal and driving the switching tube to change a conducting state according to the carrier signal;
the enabling circuit is connected with the driving circuit and used for receiving an enabling signal and controlling the driving voltage of the switching tube according to the enabling signal;
the controller is connected with the driving circuit and the enabling circuit and is used for outputting the carrier signal; and
acquiring an electric signal input by a power grid, and outputting the enabling signal according to the electric signal;
acquiring a target duty ratio and acquiring an electric signal input by a power grid;
determining a target modulation period according to the rectification period of the electric signal;
determining a modulation duty ratio in the target modulation period according to the target duty ratio; determining a target carrier signal according to the modulation duty ratio, and controlling the electromagnetic heating circuit through the target carrier signal;
the target modulation period comprises a plurality of rectification periods of the power grid, and the modulation period comprises a plurality of sub-modulation periods;
the target modulation period includes at least two sub-modulation periods, and the step of determining the modulation duty ratio in the target modulation period according to the target duty ratio specifically includes:
determining the sub-modulation duty ratio corresponding to each sub-modulation period according to the target duty ratio;
and the periods of any two sub-modulation periods are the same, and the average value of all the sub-modulation duty ratios is equal to the duty ratio value of the target duty ratio.
2. The electromagnetic heating circuit of claim 1, wherein the controller includes an enable signal output port, the enable circuit comprising:
one end of the first resistive element is connected with the enable signal output port, and the other end of the first resistive element is connected with a base electrode of the first triode;
the collector of the first triode is connected with one end of a second resistive element, and the emitter of the first triode is grounded;
and the other end of the second resistive element is connected with the driving circuit.
3. The electromagnetic heating circuit of claim 2, wherein the controller comprises an electrical signal acquisition port, the electromagnetic heating circuit further comprising:
the input end of the synchronous circuit is connected with the resonance capacitor in parallel, the output end of the synchronous circuit is connected with the electric signal acquisition port, and the synchronous circuit is used for synchronously transmitting the electric signal applied to the resonance capacitor to the controller so that the controller generates the enabling signal according to the electric signal.
4. The electromagnetic heating circuit of claim 3, wherein the controller is specifically configured to:
the enabling signal is output when the zero crossing point of the electric signal is detected, so that the first triode is conducted, and the driving voltage of the switching element is low-voltage driving;
the voltage amplitude of the enable signal is larger than the conduction voltage value of the first triode.
5. The electromagnetic heating circuit according to any one of claims 1 to 4, characterized in that the drive circuit comprises:
a base electrode of the second triode is connected with the enabling circuit, an emitting electrode of the second triode is connected with one end of a third resistive element, and a collector electrode of the second triode is connected with an emitting electrode of the switching tube;
a base of the third triode is connected with the controller and is used for receiving the carrier signal, an emitter of the third triode is connected with the other end of the third resistive element, and a collector of the third triode is connected with a power supply;
and one end of the fourth resistive element is connected with the other end of the third resistive element, and the other end of the fourth resistive element is connected with a gate pole of the switching tube.
6. An electromagnetic heating device, characterized in that it comprises an electromagnetic heating circuit according to any one of claims 1 to 5.
7. A drive control method for controlling the electromagnetic heating circuit according to any one of claims 1 to 5, characterized by comprising:
acquiring a target duty ratio and acquiring an electric signal input by a power grid;
determining a target modulation period according to the rectification period of the electric signal;
determining a modulation duty ratio in the target modulation period according to the target duty ratio; determining a target carrier signal according to the modulation duty ratio, and controlling the electromagnetic heating circuit through the target carrier signal;
the target modulation period comprises a plurality of rectification periods of the power grid, and the modulation period comprises a plurality of sub-modulation periods;
the target modulation period includes at least two sub-modulation periods, and the step of determining the modulation duty ratio in the target modulation period according to the target duty ratio specifically includes:
determining the sub-modulation duty ratio corresponding to each sub-modulation period according to the target duty ratio;
and the periods of any two sub-modulation periods are the same, and the average value of all the sub-modulation duty ratios is equal to the duty ratio value of the target duty ratio.
8. A heating control method for an electromagnetic heating apparatus according to claim 6, characterized by comprising:
acquiring the number of heating cycles currently accumulated;
the heating period number is smaller than the target heating period number, and the duty ratio corresponding to the current heating period is obtained;
executing the current heating cycle based on the duty cycle being less than a duty cycle threshold.
9. The heating control method according to claim 8, characterized by further comprising:
setting the number of heating cycles to zero based on the number of heating cycles being greater than or equal to the target number of heating cycles.
10. A computer device, comprising:
a memory for storing a computer program;
a processor for executing the computer program to implement:
the drive control method according to claim 7; and/or
The heating control method according to claim 8 or 9.
11. A computer-readable storage medium, having a computer program stored thereon, the computer program, when executed by a processor, implementing:
the drive control method according to claim 7; and/or
The heating control method according to claim 8 or 9.
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| CN201910423061.1A CN111988876B (en) | 2019-05-21 | 2019-05-21 | Electromagnetic heating circuit, electromagnetic heating device, drive control method, and heating control method |
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