CN114269031A - Low-power continuous heating control method, medium, terminal equipment and induction cooker - Google Patents
Low-power continuous heating control method, medium, terminal equipment and induction cooker Download PDFInfo
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Abstract
The embodiment of the invention relates to a control method, a medium, terminal equipment and an induction cooker for low-power continuous heating, which are applied to a heating system of the induction cooker, wherein the heating system of the induction cooker comprises a main control module, a switch driving module, a synchronization module and a zero-crossing detection module, the switch driving module, the synchronization module and the zero-crossing detection module are connected with the main control module, a heating cycle is formed through a first stage, a second stage and a third stage, the low-power continuous heating is realized through the cyclic heating cycle, the output is carried out in a PWM mode in a discharging stage of the first stage, the PWM duty ratio is small, so that the on-time of a switching device is very short, the requirement on the switching device is not high, and the operation of the heating system of the induction cooker is reliable and stable; the second stage and the third stage are in zero crossing point operation, so that the energy in the switching device is completely released, and the noise of the heating of the induction cooker is eliminated; the control method adopts the heating period to realize millisecond heating, the low-power heating period is short, and the user experience is good.
Description
Technical Field
The invention relates to the technical field of heating of induction cookers, in particular to a control method, a medium, terminal equipment and an induction cooker for low-power continuous heating.
Background
The electromagnetic oven heats by utilizing the electromagnetic induction principle, namely, when alternating current flows through a coil panel of the electromagnetic oven, the coil panel can generate an alternating magnetic field, when a metal pan is arranged on the coil panel, a cutting magnetic field generates induced current (namely eddy current), and the eddy current enables free electrons in iron materials at the bottom of the pan to be in eddy-shaped alternating motion, namely, the eddy current and pan resistance generate heat energy, thereby realizing the heating purpose.
The induction cooker is more and more favored by consumers due to the advantages of no open fire, energy conservation, environmental protection, high heating efficiency and the like, along with the development of the society, the requirements of the induction cooker on functions of heat preservation, slow fire, slow stewing and the like are more and more high, and the high-quality induction cooker heating effect can bring comfortable experience to users. However, the existing induction cooker with low power heating has the problems of long heating period, poor effect, high noise and the like due to discontinuous heating or heating by adopting the traditional switching resonance parameter mode, and the use experience of users is influenced.
Disclosure of Invention
The embodiment of the invention provides a control method, a medium, terminal equipment and an induction cooker for low-power continuous heating, and aims to solve the technical problems of long low-power heating period and high noise of the conventional induction cooker.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a control method of low-power continuous heating is applied to a heating system of an induction cooker, wherein the heating system of the induction cooker comprises a main control module, and a switch driving module, a synchronization module and a zero-crossing detection module which are connected with the main control module;
the zero-crossing detection module is used for detecting the zero-crossing point of the alternating current input end of the induction cooker and transmitting a zero-crossing signal of the detected zero-crossing point to the main control module;
the synchronization module is used for acquiring a synchronization signal from an LC oscillation circuit of the induction cooker and transmitting the synchronization signal to the main control module;
the switch driving module is used for driving the on-off of the switch device;
the main control module is used for controlling the operation of the switch driving module according to the zero-crossing signal and the synchronous signal;
when the induction cooker enters low-power heating, the computer program is executed to realize the following steps:
s1, in the first stage, the main control module controls the switch driving module to output a first driving voltage in a PWM mode, and the first driving voltage switches on the switch device;
s2, when the zero-crossing detection module detects a zero-crossing point, the second stage is started, the main control module controls the switch driving module to output a second driving voltage in a PPG mode, the second driving voltage enables the switch device to be in a saturated working state, and the induction cooker heats;
s3, in the third stage, when the zero-crossing detection module detects a zero-crossing point, the main control module controls a switch device of the switch driving module to be switched off, and the induction cooker stops heating;
s4, repeating the steps from S1 to S3, and continuously heating the induction cooker under the low-power condition.
Preferably, before the low power continuous heating mode is executed, the step of executing the computer program of the main control module further includes:
judging whether the induction cooker carries out low-power heating or not according to the heating information of the induction cooker;
if the induction cooker is heating at low power, executing the steps S1 to S4;
if the induction cooker does not perform low-power heating, the main control module exits the low-power continuous heating mode;
wherein the heating information comprises a heating signal and a heating power.
Preferably, the conditions for determining whether the induction cooker performs low power heating are: the heating power is lower than the lowest continuous power threshold value of the induction cooker.
Preferably, the lowest continuous power threshold of the induction cooker is 1000W.
Preferably, in the first phase, the PWM mode frequency of the main control module is not less than 40kHz and less than 100kHz, and the pulse width time of the on-state of the switching device is less than or equal to 2 us; the first driving voltage is not less than 6V and less than 18V.
Preferably, the second driving voltage is not less than 12V and less than 20V.
Preferably, the switching device is a thyristor, an IGBT device or an IEGT device.
The invention also provides an induction cooker comprising the control method for low-power continuous heating.
The present invention also provides a computer-readable storage medium for storing computer instructions which, when run on a computer, cause the computer to perform the control method of low-power continuous heating described above.
The invention also provides terminal equipment, which comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the control method of the low-power continuous heating according to the instructions in the program codes.
According to the technical scheme, the embodiment of the invention has the following advantages: the control method, the medium, the terminal equipment and the induction cooker form a heating period through a first stage, a second stage and a third stage, the low-power continuous heating is realized through the cyclic heating period, the discharging stage of the first stage is output in a PWM mode, the PWM duty ratio is small, the switching-on time of a switching device is very short, the requirement on the switching device is not high, and the heating system of the induction cooker runs reliably and stably; the second stage and the third stage are in zero crossing point operation, so that the energy in the switching device is completely released, and the noise of the heating of the induction cooker is eliminated; the control method of the low-power continuous heating does not need to add extra circuits and structural parts, is simple and convenient to assemble and has low cost; millisecond heating is realized by adopting a heating period, the low-power heating period is short, and the user experience is good; the technical problems of long low-power heating period and high noise of the existing induction cooker are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart illustrating steps of a method for controlling low-power continuous heating according to an embodiment of the present invention.
Fig. 2 is a block diagram of a heating system of an induction cooker according to an embodiment of the present invention.
Fig. 3 is a voltage waveform diagram of a low-power continuous heating switching device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
After the alternating current power supply of the induction cooker is rectified by the bridge rectifier, more than 300 volts of direct current voltage can be formed under the action of the capacitor, and the continuous heating condition of the existing induction cooker is that the heating power is more than 1000W. If the heating power is lower than the minimum continuous power (such as 1000W), the induction cooker enters a low-power heating working stage, and at present, the low-power heating working stage of the induction cooker mainly has three modes: the first one is to adopt traditional intermittent heating mode, is to heat for a few seconds promptly, and the stop heating is for a few seconds, and so circulation, the cycle length is long, and it is poor to cook and eat the effect, and the noise is big when the start-up of electromagnetism stove or stop heating, leads to user experience not good. The second is to adopt a relay to switch the capacitor, but the heating operation needs to be stopped in the switching process, noise is generated in the switching process, the requirement of high-frequency current on the relay is high, and the service life is limited; the third is to use a relay to switch a wire coil, but the switching noise also exists in the influence on the heating area of the induction cooker.
The embodiment of the application provides a control method, a medium, terminal equipment and an induction cooker for low-power continuous heating, and is used for solving the technical problems of long low-power heating period and high noise of the existing induction cooker.
The first embodiment is as follows:
fig. 1 is a flowchart illustrating steps of a control method for low power continuous heating according to an embodiment of the present invention, and fig. 2 is a block diagram illustrating an induction cooker heating system according to the control method for low power continuous heating according to the embodiment of the present invention.
As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a control method for low-power continuous heating, which is applied to a heating system of an induction cooker, where the heating system of the induction cooker includes a main control module 10, and a switch driving module 20, a synchronization module 30, and a zero-crossing detection module 40 connected to the main control module 10;
the zero-crossing detection module 40 is used for detecting the zero-crossing point of the alternating current input end of the induction cooker and transmitting a zero-crossing signal of the detected zero-crossing point to the main control module 10;
the synchronization module 30 is used for acquiring a synchronization signal from an LC oscillation circuit of the induction cooker and transmitting the synchronization signal to the main control module 10;
a switch driving module 20 for driving the on/off of the switching device 21;
the main control module 10 is used for controlling the operation of the switch driving module 20 according to the zero-crossing signal and the synchronous signal;
wherein, the main control module 10 stores a computer program of the low power continuous heating mode, the low power continuous heating mode includes a first stage, a second stage and a third stage, when the induction cooker enters the low power heating mode, the following steps are realized when the computer program is executed:
s1, in a first stage, a main control module 10 controls a switch driving module 20 to output a first driving voltage in a PWM mode, and the first driving voltage switches on a switch device;
s2, when the zero-crossing detection module 40 detects a zero-crossing point, entering a second stage, controlling the switch driving module 20 by the main control module 10 in a PPG mode to output a second driving voltage, enabling the switch device 21 to be in a saturated working state by the second driving voltage, and heating by the induction cooker;
s3, when the zero-crossing detection module 40 detects the zero-crossing point again, the main control module 10 controls the switching device 21 of the switch driving module 20 to be switched off, and the induction cooker stops heating;
s4, repeating the steps from S1 to S3, and continuously heating the induction cooker under the low-power condition.
As shown in fig. 2, in the embodiment of the present invention, the heating system of the induction cooker further includes an LC oscillating circuit, the zero-cross detecting module 40 is further connected to an ac input terminal of the induction cooker, the ac is connected to the LC oscillating circuit through a rectifying circuit, the LC oscillating circuit is respectively connected to the synchronizing module 30 and a second terminal of the switching device 21, a first terminal of the switching device 21 is connected to the switch driving module 20, and a third terminal of the switching device 21 is connected to ground.
It should be noted that the LC oscillating circuit includes a first capacitor C1 and a first inductor L1, and the rectifying circuit includes a rectifying bridge, a second inductor L2, and a second capacitor C2. The LC oscillating circuit is provided with a heating plate of the induction cooker.
Fig. 3 is a voltage waveform diagram of a low-power continuous heating switching device according to an embodiment of the present invention.
In the embodiment of the present invention, the low power continuous heating mode is implemented by a cyclic heating period T including a first stage T1, a second stage T2, and a third stage T3. Specifically, before the zero-crossing detection module 40 detects a zero-crossing point of the alternating current, the first driving voltage V1 drives the switching device 21 to be turned on quickly to achieve a quick discharging process in the first stage T1, the second stage T2 is mainly a start-up heating control of the zero-crossing point, and the third stage T3 is mainly a stop-heating control of the zero-crossing point. In the first stage T1, the main control module 10 controls the switch driving module 20 to output an electrical signal to control the on/off of the switching device 21 in the PWM output mode, and uses the first driving voltage V1 to make the switching device 21 in an amplified state, so as to effectively suppress the pulse current turned on by the switching device 21 in the high-frequency state; in the second stage T2, the main control module 10 controls the switch driving module 20 to output an electrical signal in the PPG mode so that the switching device 21 works, and uses the second driving voltage V2 to make the switching device 21 work in a saturated state, so that the induction cooker performs normal resonant heating; in the third stage T3, the zero-crossing detection module 40 detects a zero-crossing point again, and the main control module 10 controls the switch driving module 20 to turn off the PPG mode to output an electrical signal at the zero-crossing point, so that the induction cooker stops heating.
Note that the fast turn-on time is within 10 microseconds. The switching device 21 may be an IGBT device, or may be a switching device having a controllable function, such as a triode, a thyristor, and an IEGT device. In the present embodiment, the switching device 21 is an IGBT device, a base of the IGBT device is a first terminal of the switching device 21, a collector of the IGBT device is a second terminal of the switching device 21, and an emitter of the IGBT device is a third terminal of the switching device 21. The PPG mode refers to a mode in which an electrical signal is output according to different power adjustments for different PWM duty cycles.
The control method for low-power continuous heating provided by the invention forms a heating period through three stages, the low-power continuous heating is realized through the cyclic heating period, the discharging stage in the first stage is output in a PWM mode, the PWM duty ratio is small, the switching-on time of a switching device is very short, the requirement on the switching device is not high, and the heating system of the induction cooker is reliable and stable in operation; the second stage and the third stage are in zero crossing point operation, so that the energy in the switching device is completely released, and the noise of the heating of the induction cooker is eliminated; the control method of the low-power continuous heating does not need to add extra circuits and structural parts, is simple and convenient to assemble and has low cost; millisecond heating is realized by adopting a cyclic heating period, the low-power heating period is short, and the user experience is good; the technical problems of long low-power heating period and high noise of the existing induction cooker are solved.
The control method for low-power continuous heating provided by the invention has very short discharge time in the first stage T1 and heating time in the second stage T2, so that the heating period T of the induction cooker under the low-power condition can be shortened to dozens of milliseconds, continuous low-power stable output is realized, noise generated during heating is basically eliminated, and the use experience of a user is greatly improved.
In one embodiment of the present invention, before the low power continuous heating mode is executed, the step of executing the computer program of the main control module further includes:
judging whether the induction cooker carries out low-power heating or not according to the heating information of the induction cooker;
if the induction cooker is heating at low power, executing the steps S1 to S4;
if the induction cooker does not perform low-power heating, the main control module quits the low-power continuous heating mode;
wherein the heating information comprises a heating signal and a heating power.
In this embodiment, the conditions for determining whether the induction cooker performs low power heating are: the heating power is lower than the lowest continuous power threshold of the induction cooker.
It should be noted that the main control module 10 enters the low power determination and processing after receiving the heating information of the induction cooker, and the main control module 10 compares the minimum continuous power threshold specified by the heating system of the induction cooker with the actually required heating power after receiving the heating information, and if the actually required heating power is lower than the minimum continuous power threshold, the heating cycle enters the heating cycle of the low power continuous heating mode, otherwise, the low power continuous heating mode exits. The lowest continuous power threshold of the induction cooker is 1000W.
In one embodiment of the present invention, the first driving voltage V1 is not less than 6V and less than 18V. The second driving voltage V2 is not less than 12V and less than 20V. In the first stage T1, the PWM mode frequency of the main control module 10 is not less than 40kHz and less than 100kHz, and the pulse width time of the on-state of the switching device 21 is less than or equal to 2 us.
In the control method of the low power continuous heating, the first drive voltage V1 is equal to or higher than the on threshold voltage of the switching device 21 and lower than 18V. In the first stage T1, the main control module 10 controls the PWM mode output time T1 of the switch driving module 20 to be greater than or equal to 1ms and less than or equal to 8ms, and is completed before the zero crossing point, and the PWM mode output frequency is greater than or equal to 40KHz and less than 100KHz, and the pulse width time for controlling the switching device 21 to be turned on in a single period of the PWM mode is not greater than 2us (i.e., the duty ratio of PWM). In the second stage T2, the second driving voltage V2 is greater than or equal to 12V and less than 20V, and a zero-crossing point after the discharge of the first stage T1 in each heating period T is the beginning of the second stage T2, at this time, the main control module 10 controls the switch driving module 20 to start the PPG mode output. In the third stage T3, when the zero-crossing detection module 40 detects a zero-crossing point, the main control module 10 controls the switch driving module 20 to turn off the switch device 21, and meanwhile, the main control module 10 does not process the synchronization signal transmitted by the synchronization module 30 any more, and the induction cooker stops heating. In the present embodiment, the on threshold voltage of the switching device 21 is 6V.
Example two:
the embodiment of the invention also provides the induction cooker, which comprises the control method for low-power continuous heating.
It should be noted that the control method for reducing noise of the pan detection of the induction cooker has been explained in detail in the first embodiment, and is not explained in the second embodiment one by one.
Example three:
an embodiment of the present invention provides a computer-readable storage medium for storing computer instructions which, when run on a computer, cause the computer to perform the above-described control method of low-power continuous heating.
Example four:
the embodiment of the invention provides terminal equipment, which comprises a processor and a memory;
a memory for storing the program code and transmitting the program code to the processor;
and the processor is used for executing the control method of the low-power continuous heating according to the instructions in the program codes.
It should be noted that the processor is configured to execute the steps in the above-mentioned embodiment of the control method for low-power continuous heating according to the instructions in the program code. Alternatively, the processor, when executing the computer program, implements the functions of each module/unit in each system/apparatus embodiment described above.
Illustratively, a computer program may be partitioned into one or more modules/units, which are stored in a memory and executed by a processor to accomplish the present application. One or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of a computer program in a terminal device.
The terminal device may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor, a memory. Those skilled in the art will appreciate that the terminal device is not limited and may include more or fewer components than those shown, or some components may be combined, or different components, e.g., the terminal device may also include input output devices, network access devices, buses, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage may be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the terminal device. Further, the memory may also include both an internal storage unit of the terminal device and an external storage device. The memory is used for storing computer programs and other programs and data required by the terminal device. The memory may also be used to temporarily store data that has been output or is to be output.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A control method of low-power continuous heating is applied to a heating system of an induction cooker, and is characterized in that the heating system of the induction cooker comprises a main control module, and a switch driving module, a synchronization module and a zero-crossing detection module which are connected with the main control module;
the zero-crossing detection module is used for detecting the zero-crossing point of the alternating current input end of the induction cooker and transmitting a zero-crossing signal of the detected zero-crossing point to the main control module;
the synchronization module is used for acquiring a synchronization signal from an LC oscillation circuit of the induction cooker and transmitting the synchronization signal to the main control module;
the switch driving module is used for driving the on-off of the switch device;
the main control module is used for controlling the operation of the switch driving module according to the zero-crossing signal and the synchronous signal;
when the induction cooker enters low-power heating, the computer program is executed to realize the following steps:
s1, in the first stage, the main control module controls the switch driving module to output a first driving voltage in a PWM mode, and the first driving voltage switches on the switch device;
s2, when the zero-crossing detection module detects a zero-crossing point, the second stage is started, the main control module controls the switch driving module to output a second driving voltage in a PPG mode, the second driving voltage enables the switch device to be in a saturated working state, and the induction cooker heats;
s3, in the third stage, when the zero-crossing detection module detects a zero-crossing point, the main control module controls a switch device of the switch driving module to be switched off, and the induction cooker stops heating;
s4, repeating the steps from S1 to S3, and continuously heating the induction cooker under the low-power condition.
2. The method as claimed in claim 1, wherein the step of executing the computer program of the main control module before executing the low power continuous heating mode further comprises:
judging whether the induction cooker carries out low-power heating or not according to the heating information of the induction cooker;
if the induction cooker is heating at low power, executing the steps S1 to S4;
if the induction cooker does not perform low-power heating, the main control module exits the low-power continuous heating mode;
wherein the heating information comprises a heating signal and a heating power.
3. The control method of low power continuous heating according to claim 2, wherein the judgment condition for judging whether the induction cooker performs low power heating is: the heating power is lower than the lowest continuous power threshold value of the induction cooker.
4. The method for controlling low power continuous heating according to claim 3, wherein the minimum continuous power threshold of the induction cooker is 1000W.
5. The control method of low-power continuous heating according to claim 1, wherein in the first stage, the PWM mode frequency of the main control module is not less than 40kHz and less than 100kHz, and the pulse width time of the switch device is less than or equal to 2 us; the first driving voltage is not less than 6V and less than 18V.
6. The control method of low-power continuous heating according to claim 1, wherein the second driving voltage is not less than 12V and less than 20V.
7. A control method of low power continuous heating according to claim 1, characterized in that the switching devices are thyristors, IGBT devices or IEGT devices.
8. An induction cooker comprising the method of controlling low power continuous heating according to any one of claims 1 to 7.
9. A computer-readable storage medium for storing computer instructions which, when run on a computer, cause the computer to perform the method of controlling low-power continuous heating according to any one of claims 1 to 7.
10. A terminal device comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the control method of low power continuous heating according to any one of claims 1 to 7 according to instructions in the program code.
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| US20090020516A1 (en) * | 2005-11-16 | 2009-01-22 | Matsushita Electric Industrial Co., Ltd | Cooking device |
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