CN114269031B - Control method, medium, terminal equipment and induction cooker for low-power continuous heating - Google Patents
Control method, medium, terminal equipment and induction cooker for low-power continuous heating Download PDFInfo
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Abstract
The embodiment of the invention relates to a control method, 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 synchronous module and a zero-crossing detection module which are connected with the main control module, a heating period is formed through a first stage, a second stage and a third stage, the low-power continuous heating is realized through the cyclic heating period, the low-power continuous heating is output in a PWM (pulse width modulation) mode in a discharging stage of the first stage, the PWM duty ratio is small, the 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 work, so that the energy in the switching device is completely released, and the heating noise of the induction cooker is eliminated; the control method realizes millisecond heating by adopting the heating period, and has the advantages of short low-power heating period and good user experience.
Description
Technical Field
The invention relates to the technical field of electromagnetic oven heating, in particular to a control method, medium, terminal equipment and an electromagnetic oven for low-power continuous heating.
Background
The induction cooker is heated by utilizing the electromagnetic induction principle, namely, when alternating current flows through a coil panel of the induction cooker, the coil panel can generate an alternating magnetic field, when a metal cooker is placed on the coil panel, the cutting magnetic field generates induction current (namely, eddy current), and free electrons in iron materials at the bottom of the cooker are enabled to perform eddy-like alternating motion by the eddy current, namely, the eddy current and the cooker resistor generate heat energy, so that the heating purpose is realized.
The induction cooker is more and more popular with consumers due to the advantages of no open fire, energy conservation, environmental protection, high heating efficiency and the like, and along with the development of society, the requirements of the induction cooker on functions of heat preservation, slow fire, slow stewing and the like are also higher and higher, and the heating effect of the induction cooker with high quality can bring comfortable experience to users. However, the existing induction cooker is heated in a discontinuous heating mode or a traditional resonant parameter switching mode, so that the heating period is long, the effect is poor, meanwhile, the problems of high noise and the like exist, and the use experience of a user is affected.
Disclosure of Invention
The embodiment of the invention provides a control method, medium, terminal equipment and an induction cooker for low-power continuous heating, which are used for solving 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 embodiment of the present invention provides the following technical solutions:
the control method of low-power continuous heating is applied to a heating system of an electromagnetic oven, wherein the heating system of the electromagnetic oven 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 zero crossing points of an alternating current input end of the induction cooker and transmitting zero crossing signals for detecting the zero crossing points to the main control module;
the synchronous module is used for acquiring a synchronous signal from an LC oscillating circuit of the induction cooker and transmitting the synchronous 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;
the main control module is stored with a computer program of a low-power continuous heating mode, the low-power continuous heating mode comprises a first stage, a second stage and a third stage, and 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 turns on the switching device;
s2, when the zero crossing detection module detects a zero crossing point, entering the second stage, and controlling the switch driving module to output a second driving voltage by the main control module in a PPG mode, wherein the second driving voltage enables the switch device to be in a saturated working state, and heating the induction cooker;
s3, in the third stage, when the zero crossing detection module detects a zero crossing point, the main control module controls a switching device of the switch driving module to be switched off, and the induction cooker stops heating;
s4, repeatedly executing the steps S1 to S3, and continuously heating the induction cooker under the low-power condition.
Preferably, before executing the low power continuous heating mode, the steps executed by the computer program of the main control module further include:
judging whether the induction cooker is subjected to low-power heating according to heating information of the induction cooker;
if the induction cooker is subjected to low-power heating, 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 includes a heating signal and a heating power.
Preferably, the judging conditions for judging whether the induction cooker is subjected to low-power heating are as follows: the heating power is lower than the minimum continuous power threshold of the induction cooker.
Preferably, the minimum continuous power threshold of the induction cooker is 1000W.
Preferably, 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 switching device for conduction is less than or equal to 2us; 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, which comprises the control method for low-power continuous heating.
The present invention also provides a computer readable storage medium for storing computer instructions that, when executed on a computer, cause the computer to perform the control method of low power continuous heating described above.
The invention also provides a terminal device, 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 configured to execute the control method for low-power continuous heating according to the instruction in the program code.
From the above technical solutions, the embodiment of the present invention has the following advantages: according to the control method, medium, terminal equipment and electromagnetic oven for low-power continuous heating, a heating period is formed through a first stage, a second stage and a third stage, the low-power continuous heating is realized through the cyclic heating period, the discharge stage in the first stage is output in a PWM mode, the PWM duty ratio is small, the on time of a switching device is very short, the requirement on the switching device is low, and the heating system of the electromagnetic oven is reliable and stable in operation; the second stage and the third stage are in zero crossing work, so that the energy in the switching device is completely released, and the heating noise of the induction cooker is eliminated; the control method for low-power continuous heating does not need to add additional circuits and structural parts, is simple and convenient to assemble and has low cost; the millisecond heating is realized by adopting the heating period, the low-power heating period is short, and the user experience is good; solves the technical problems of long low-power heating period and large noise of the existing electromagnetic oven.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a flow chart of steps of a control method for low power continuous heating according to an embodiment of the present invention.
Fig. 2 is a frame diagram of an induction cooker heating system according to a control method of low-power continuous heating in an embodiment of the invention.
Fig. 3 is a voltage waveform diagram of a low-power continuous heating switching device according to a control method of low-power continuous heating according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The alternating current power supply of the induction cooker is rectified by the bridge pile, and then 300-volt direct current voltage can be formed under the action of the capacitor, and the condition that the existing induction cooker is continuously heated is that the heating power is more than 1000W. If the heating power is lower than the minimum continuous power (for example, 1000W), the induction cooker enters a low-power heating working stage, and three modes are mainly adopted in the low-power heating working stage of the induction cooker at present: the first is to adopt traditional intermittent heating mode, namely heating for several seconds, stopping heating for several seconds, so circulating, the cycle is long, the cooking effect is poor, and noise is big when the induction cooker starts or stops heating, resulting in poor user experience. The second is to switch the capacitor by using a relay, but the switching process needs to stop the heating work, and the switching process can generate noise, the requirement of high-frequency current on the relay is high, and the service life is limited; the third is to switch the wire coil by using a relay, but there is switching noise when the heating area of the induction cooker is affected.
The embodiment of the application provides a control method, medium, terminal equipment and induction cooker for low-power continuous heating, which are used for solving the technical problems of long low-power heating period and large noise of the conventional induction cooker.
Embodiment one:
fig. 1 is a flow chart of steps of a control method for low-power continuous heating according to an embodiment of the present invention, and fig. 2 is a frame diagram of 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, the embodiment of the invention provides a control method for low-power continuous heating, which is applied to a heating system of an induction cooker, wherein the heating system of the induction cooker comprises a main control module 10, and a switch driving module 20, a synchronization module 30 and a zero-crossing detection module 40 which are connected with the main control module 10;
the zero-crossing detection module 40 is used for detecting zero crossing points of the alternating current input end of the induction cooker and transmitting zero crossing signals of the detected zero crossing points to the main control module 10;
the synchronization module 30 is configured to acquire a synchronization signal from an LC oscillation circuit of the induction cooker and transmit the synchronization signal to the main control module 10;
a switch driving module 20 for driving 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 a 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 low-power heating, the following steps are implemented 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 turns on a switching device;
s2, when the zero crossing detection module 40 detects the zero crossing point, the main control module 10 controls the switch driving module 20 to output a second driving voltage in a PPG mode, and the second driving voltage enables the switch device 21 to be in a saturated working state, so that the induction cooker is heated;
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, repeatedly executing the steps 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-crossing detection module 40 is further connected to an ac input end 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 synchronization module 30 and a second end of the switching device 21, a first end of the switching device 21 is connected to the switch driving module 20, and a third end of the switching device 21 is grounded.
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 a control method of low-power continuous heating according to an embodiment of the present invention.
In the embodiment of the present invention, the low-power continuous heating mode is realized by a cyclic heating period T, and the heating period T includes a first stage T1, a second stage T2, and a third stage T3. Specifically, the first stage T1 drives the switching device 21 to be turned on rapidly to perform the rapid discharge process before the zero crossing detection module 40 detects the zero crossing point of the alternating current, the second stage T2 is mainly the start heating control of the zero crossing point, and the third stage T3 is mainly the stop heating control of the zero crossing point. The first stage T1 is that 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 a PWM output mode, and simultaneously uses the first driving voltage V1 to make the switching device 21 in an amplified state, so as to effectively inhibit the pulse current of the switching device 21 being turned on in a 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 PPG mode so that the switching device 21 works, and simultaneously uses the second driving voltage V2 to make the switching device 21 work in a saturated state, so that the induction cooker is heated in a normal resonance mode; the third stage T3 detects zero crossing again according to the zero crossing detection module 40 and controls the switch driving module 20 to close the PPG mode to output an electrical signal at the zero crossing point, so that the induction cooker stops heating.
It should be noted that the time of the quick turn-on 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 transistor, a thyristor, or an IEGT device. In this embodiment, the switching device 21 is an IGBT device, the base of the IGBT device is the first end of the switching device 21, the collector of the IGBT device is the second end of the switching device 21, and the emitter of the IGBT device is the third end of the switching device 21. The PPG mode refers to a mode in which the duty cycle of different PWM outputs an electrical signal according to different powers.
According to the control method for low-power continuous heating, a heating period is formed through three stages, the low-power continuous heating is realized through the cyclic heating period, the PWM mode is output in the discharging stage of the first stage, 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 to operate; the second stage and the third stage are in zero crossing work, so that the energy in the switching device is completely released, and the heating noise of the induction cooker is eliminated; the control method for low-power continuous heating does not need to add additional circuits and structural parts, is simple and convenient to assemble and has low cost; the millisecond heating is realized by adopting the cyclic heating period, the low-power heating period is short, and the user experience is good; solves the technical problems of long low-power heating period and large noise of the existing electromagnetic oven.
According to the control method for low-power continuous heating, provided by the invention, the discharge time of the first stage T1 and the heating time of the second stage T2 are very short, so that the heating period T under the low-power condition of the induction cooker can be shortened to tens 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 executing the low power continuous heating mode, the computer program executed by the main control module further includes:
judging whether the induction cooker is subjected to low-power heating according to heating information of the induction cooker;
if the induction cooker is subjected to low-power heating, 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 includes a heating signal and a heating power.
In this embodiment, the judging conditions for judging whether the induction cooker is performing low-power heating are: the heating power is below the minimum continuous power threshold of the induction cooker.
It should be noted that, the main control module 10 may enter the low power judgment and processing after receiving the heating information of the induction cooker, the main control module 10 may compare the heating power with the minimum continuous power threshold specified by the heating system of the induction cooker after receiving the heating information, and if the heating power actually required is lower than the minimum continuous power threshold, the main control module may cycle into the heating period of the low power continuous heating mode, and otherwise exit the low power continuous heating mode. The minimum 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 switching device 21 is less than or equal to 2us.
The first driving voltage V1 of the control method for low-power continuous heating is equal to or greater than the on threshold voltage of the switching device 21 and less 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 to be 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 cycle of PWM). In the second stage T2, the second driving voltage V2 is greater than or equal to 12V and less than 20V, and the 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 PPG mode output. In the third stage T3, when the zero crossing detection module 40 detects the zero crossing point, the main control module 10 controls the switch driving module 20 to turn off the switching device 21, and at the same time, the main control module 10 does not process the synchronization signal transmitted by the synchronization module 30, so that the induction cooker stops heating. In the present embodiment, the on threshold voltage of the switching device 21 is 6V.
Embodiment two:
the embodiment of the invention also provides an induction cooker, which comprises the control method for low-power continuous heating.
It should be noted that, the control method for noise reduction of the induction cooker inspection pot has been described in detail in the first embodiment, and is not described in detail in the second embodiment.
Embodiment III:
embodiments of the present invention provide a computer-readable storage medium storing computer instructions that, when executed on a computer, cause the computer to perform the control method of low power continuous heating described above.
Embodiment four:
the embodiment of the invention provides terminal equipment, which comprises a processor and a memory;
a memory for storing program code and transmitting the program code to the processor;
and the processor is used for executing the control method of 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 embodiment of the control method for low-power continuous heating according to the instructions in the program code. In the alternative, the processor, when executing the computer program, performs the functions of the modules/units in the system/apparatus embodiments described above.
For example, a computer program may be split into one or more modules/units, which are stored in a memory and executed by a processor to complete the present application. One or more of the modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the terminal device.
The terminal device may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The terminal device may include, but is not limited to, a processor, a memory. It will be appreciated by those skilled in the art that the terminal device is not limited and may include more or less components than those illustrated, or may be combined with certain components, or different components, e.g., the terminal device may also include input and output devices, network access devices, buses, etc.
The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 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 provided on the terminal device, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like. 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 will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform 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, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. The control method of low-power continuous heating is applied to a heating system of an electromagnetic oven and is characterized in that the heating system of the electromagnetic oven comprises a main control module, a switch driving module, a synchronous module and a zero crossing detection module, wherein the switch driving module, the synchronous module and the zero crossing detection module are connected with the main control module;
the zero-crossing detection module is used for detecting zero crossing points of an alternating current input end of the induction cooker and transmitting zero crossing signals for detecting the zero crossing points to the main control module;
the synchronous module is used for acquiring a synchronous signal from an LC oscillating circuit of the induction cooker and transmitting the synchronous 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; the main control module is stored with a computer program of a low-power continuous heating mode, the low-power continuous heating mode comprises a first stage, a second stage and a third stage, and 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 turns on the switching device;
s2, when the zero crossing detection module detects a zero crossing point, entering the second stage, and controlling the switch driving module to output a second driving voltage by the main control module in a PPG mode, wherein the second driving voltage enables the switch device to be in a saturated working state, and heating the induction cooker;
s3, in the third stage, when the zero crossing detection module detects a zero crossing point, the main control module controls a switching device of the switch driving module to be switched off, and the induction cooker stops heating;
s4, repeatedly executing the steps S1 to S3, and continuously heating the induction cooker under the low-power condition;
before executing the low power continuous heating mode, the steps executed by the computer program of the main control module further include:
judging whether the induction cooker is subjected to low-power heating according to heating information of the induction cooker; the judging conditions for judging whether the induction cooker is heated with low power are as follows: the heating power is lower than the lowest continuous power threshold of the induction cooker;
if the induction cooker is subjected to low-power heating, 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 heating power; the minimum continuous power threshold of the induction cooker is 1000W; 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 switching device for conduction is less than or equal to 2us; the first driving voltage is not less than 6V and less than 18V.
2. 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.
3. The method of claim 1, wherein the switching device is a thyristor, an IGBT device, or an IEGT device.
4. An induction cooker comprising a control method for low-power continuous heating as claimed in any one of claims 1 to 3.
5. A computer readable storage medium storing computer instructions which, when run on a computer, cause the computer to perform the control method of low power continuous heating as claimed in any one of claims 1 to 3.
6. 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 for low-power continuous heating according to any one of claims 1 to 3 according to instructions in the program code.
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