CN112555925A - Noise reduction method for induction cooker with more than two wire coils - Google Patents
Noise reduction method for induction cooker with more than two wire coils Download PDFInfo
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- CN112555925A CN112555925A CN202110034484.1A CN202110034484A CN112555925A CN 112555925 A CN112555925 A CN 112555925A CN 202110034484 A CN202110034484 A CN 202110034484A CN 112555925 A CN112555925 A CN 112555925A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C7/00—Stoves or ranges heated by electric energy
- F24C7/06—Arrangement or mounting of electric heating elements
- F24C7/067—Arrangement or mounting of electric heating elements on ranges
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C7/00—Stoves or ranges heated by electric energy
- F24C7/08—Arrangement or mounting of control or safety devices
- F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
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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
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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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- Induction Heating Cooking Devices (AREA)
Abstract
The invention relates to the technical field of induction cookers, in particular to a noise reduction method of an induction cooker with more than two wire coils, which comprises the following steps: a pre-working discharging step, wherein before each wire coil enters a working state, a main control module connected with the wire coil detects a zero crossing point of alternating current input, a capacitor connected with the wire coil is discharged before the zero crossing point, and the wire coil enters the working state after the zero crossing point of the discharging is finished; in the time-sharing preheating step, a master controller controls each wire coil to be in a working state in different time periods, and heating power and working frequency information of each wire coil are obtained; and switching heating at the same frequency, wherein the master controller controls each wire coil to work at the same frequency according to the acquired heating power and working frequency information of each wire coil, and at least part of the wire coils are switched to heat, wherein the switching heating is that part of time periods of the wire coils are in a working state in a certain time period, and part of the time periods are in a stop state.
Description
Technical Field
The invention relates to the technical field of induction cookers, in particular to a noise reduction method for an induction cooker with more than two wire coils.
Background
The electromagnetic oven heats by utilizing the electromagnetic induction principle, namely when alternating current passes through the wire coil, the wire coil generates an alternating magnetic field, when a metal pan is arranged on the wire coil, a cutting magnetic field generates eddy current, the eddy current enables free electrons in iron materials at the bottom of the pan to be in eddy-shaped alternating motion, and the eddy current and pan resistance generate heat energy, so that the heating purpose is realized. The electromagnetic oven is favored by consumers due to the advantages of environmental protection, energy conservation, high heating efficiency, safety and the like.
In the prior art, induction cooker noise is a common problem. In the process of starting the induction cooker, an alternating current power supply can form a direct current voltage of more than 300 volts due to the action of capacitance after being rectified by a bridge rectifier, and because the collector voltage of an Insulated Gate Bipolar Transistor (IGBT) is high, energy cannot be released, so that the noise is large when a wire coil is started. And for the electromagnetism stove that is provided with the drum more than two, set up more than two drums like partial single-end kitchen, perhaps be provided with a plurality of drums in the multi-end kitchen, in foretell circumstances, when the distance between the drum is less, and different drum during operation's operating frequency is different, also can produce the harsh noise. The problems lead the induction cooker with more than two wire coils in the prior art to generate noise in the starting process and the heating process, and the use experience of a user is influenced to a great extent.
Disclosure of Invention
The invention aims to provide a noise reduction method for an induction cooker with more than two wire coils, and aims to solve the problem that the induction cooker with more than two wire coils generates noise in the starting process and the heating process.
In order to achieve the above object, the present invention provides a noise reduction method for an induction cooker with more than two wire coils, wherein each wire coil is controlled by a main control module connected with the wire coil, each main control module is connected with a control panel and is controlled by a main controller of the control panel of the induction cooker, and the method comprises the following steps: a pre-working discharging step, wherein before each wire coil enters a working state, a main control module connected with the wire coil detects a zero crossing point of alternating current input, a capacitor connected with the wire coil is discharged before the zero crossing point, and the wire coil enters the working state after the zero crossing point of the discharging is finished; in the time-sharing preheating step, a master controller controls each wire coil to be in a working state in different time periods, and heating power and working frequency information of each wire coil are obtained; and switching heating at the same frequency, wherein the master controller controls each wire coil to work at the same frequency according to the acquired heating power and working frequency information of each wire coil, and at least part of the wire coils are switched to heat, wherein the switching heating is that part of time periods of the wire coils are in a working state in a certain time period, and part of the time periods are in a stop state.
Further, in the same-frequency switching heating step, at least one wire coil is continuously in a working state at a first frequency, and other wire coils are switched to heat.
Further, before the time-sharing preheating step, a heating wire coil quantity judging step is further included, if only one wire coil is needed to work, the required wire coil is controlled to enter a working state, otherwise, an interference judging step for judging whether interference exists among the wire coils is entered, if the interference exists, the required wire coil is controlled to enter the time-sharing preheating step and the same-frequency switching heating step, and otherwise, the required wire coil is controlled to enter the working state.
Further, in the interference judging step, if more than two wire coils are required to work and the distances between the wire coils required to work are larger than the interference threshold, the required wire coils are controlled to enter a working state, and if more than two wire coils are required to work and the distances between at least part of the wire coils required to work are smaller than the interference threshold, the wire coils with the distances smaller than the interference threshold are controlled to enter the time-sharing preheating step and the same-frequency switching heating step.
Further, the interference threshold is less than 150 mm.
Further, in the pre-operation discharging step, the discharging process is in a fixed PWM output mode, and the IGBT is driven by using a first voltage, wherein the first voltage is greater than or equal to the turn-on threshold voltage of the IGBT and less than 15V.
Further, in the discharging process, the PWM output time is more than or equal to 1ms and less than or equal to 8 ms.
Further, in the discharging process, the PWM output frequency is more than or equal to 50KHz and less than or equal to 100 KHz.
Further, in the discharging process, the pulse width time for controlling the IGBT to be switched on in a single PWM period is less than 2 us.
Further, after the discharging process is completed, the PPG output mode is performed at the zero crossing point, and the IGBT is driven with a second voltage, which is 15V or 18V.
Compared with the prior art, the noise reduction method for the induction cooker with more than two wire coils has the advantages that the wire coils are subjected to discharge treatment before entering the working state every time, so that the capacitance energy is released, and then the wire coils enter the working state when the zero crossing point is reached, so that the noise generated when the wire coils are started can be effectively avoided; meanwhile, a time-sharing preheating step and a same-frequency switching heating step are carried out during formal heating, in the time-sharing preheating step, as the wire coils enter a working state in a time-sharing mode, the wire coils do not interfere with each other even if the working frequencies of the wire coils are different, the heating power and the working frequency information of each wire coil are obtained in the time-sharing preheating step, so that the power is matched in the subsequent same-frequency output working state, in the same-frequency switching step, part of the wire coils are subjected to switching heating, so that the power of each wire coil can be considered under the precondition of same-frequency output, the total power required to be output by the induction cooker is kept unchanged, and the frequencies of each wire coil in the working state are consistent by means of switching heating, so that the noise caused by the interference among the wire; in conclusion, the noise reduction method for the induction cooker with more than two wire coils can enable the wire coils of the induction cooker to be free of noise when the induction cooker is started and works and heats, and can greatly improve the use experience of users.
Drawings
FIG. 1 is a schematic diagram of the pre-operation discharging step in the noise reduction method of the electromagnetic oven with more than two coils according to the present invention;
FIG. 2 is a schematic diagram of the operation of a preferred embodiment of the noise reduction method of the electromagnetic oven with more than two coils of the present invention;
FIG. 3 is a control flow chart of the noise reduction method of the electromagnetic oven with more than two wire coils.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The induction cooker with two upper wire coils can be a single-head induction cooker or a multi-head induction cooker, if the induction cooker with a single head is used, more than two wire coils are arranged in one burner, and if the induction cooker with a multi-head is used, one or more than one wire coil can be arranged in each burner. The method for reducing the noise of the induction cooker with more than two wire coils is applicable to the induction cooker with more than two wire coils, and the wire coils are possibly interfered with each other or are interfered with each other. The term "two or more" as used herein means two or more. The invention provides a noise reduction method for an induction cooker with more than two wire coils, as shown in figures 1 to 3, each wire coil is respectively controlled by a main control module connected with the wire coil, each main control module is connected with a control panel and is controlled by a main controller of the control panel of the induction cooker, and the method comprises the following steps: a pre-working discharging step, wherein before each wire coil enters a working state, a main control module connected with the wire coil detects a zero crossing point of alternating current input, a capacitor connected with the wire coil is discharged before the zero crossing point, and the wire coil enters the working state after the wire coil finishes the discharge at the zero crossing point; in the time-sharing preheating step, a master controller controls each wire coil to be in a working state in different time periods, and heating power and working frequency information of each wire coil are obtained; and switching heating at the same frequency, wherein the master controller controls each wire coil to work at the same frequency according to the acquired heating power and working frequency information of each wire coil, at least part of the wire coils are switched to heat, and the switching heating is that part of time periods of the wire coils are in a working state in a certain time period, and part of the time periods are in a stop state.
The method for reducing the noise of the induction cooker based on more than two wire coils has the advantages that the wire coils are subjected to discharge treatment before entering the working state every time, so that the capacitance energy is released, and then the wire coils enter the working state at the zero crossing point, so that the noise generated when the wire coils are started can be effectively avoided; meanwhile, a time-sharing preheating step and a same-frequency switching heating step are carried out during formal heating, in the time-sharing preheating step, as the wire coils enter a working state in a time-sharing mode, the wire coils do not interfere with each other even if the working frequencies of the wire coils are different, the heating power and the working frequency information of each wire coil are obtained in the time-sharing preheating step, so that the power is matched in the subsequent same-frequency output working state, in the same-frequency switching step, part of the wire coils are subjected to switching heating, so that the power of each wire coil can be considered under the precondition of same-frequency output, the total power required to be output by the induction cooker is kept unchanged, and the frequencies of each wire coil in the working state are consistent by means of switching heating, so that the noise caused by the interference among the wire; in conclusion, the noise reduction method for the induction cooker with more than two wire coils can enable the wire coils of the induction cooker to be free of noise when the induction cooker is started and works and heats, and can greatly improve the use experience of users.
As shown in fig. 1, which is a schematic diagram of the discharging step before operation, the process shown in T1 is a discharging process, in this process, the discharging process is a Pulse Width Modulation (PWM) output mode, and the IGBT is driven by using the first voltage U1, the first voltage U1 is greater than or equal to the turn-on threshold voltage of the IGBT and less than 15V, the first voltage U1 preferably adopts 6V, and the first voltage U1 can make the IGBT operate in an amplification state, so that the Pulse current turned on in the high-frequency state of the power tube can be effectively suppressed. Preferably, the PWM output time T1 is equal to or greater than 1ms and equal to or less than 8ms during the discharging process. Preferably, the PWM output frequency is equal to or greater than 50KHz and equal to or less than 100KHz during discharging. Preferably, during discharging, the pulse width time for controlling the IGBT to be switched on in a single PWM period is less than 2 us. After the discharging process is completed, the PPG output mode is adopted at the zero crossing point, the IGBT is driven by the second voltage U2, the second voltage U2 is 15V or 18V, and after the IGBT is driven by the 15V or 18V (specifically, the normal driving voltage required by the IGBT is taken as the reference), the wire coil enters a working state.
Based on the setting of the discharging step before operation, as shown in fig. 2, no matter in the process of preheating, continuous heating or switching heating, each wire coil needs to be discharged before the wire coil enters the operating state, and particularly, in the switching heating process, because the wire coil is in the operating state for part of the time and is in the stop state for part of the time, the capacitor can accumulate energy in the stop state, and if the energy is not released, the wire coil starting noise can be generated periodically in the switching heating process, and due to the discharging step before operation, the wire coil is discharged every time before entering the operating state, so that the effect that the switching heating process does not generate the starting noise can be realized.
In this embodiment, a schematic diagram of the time-sharing preheating step and the same-frequency switching heating step is shown in fig. 2. In the time-sharing preheating step, although the working frequencies of different wire coils are possibly different, the wire coils enter the working state in different time periods, so that the condition that the mutual interference generates noise does not exist, and simultaneously, the wire coils have the discharging process before entering the working state, so the noise does not generate in the whole preheating step. In the preheating step, the master controller acquires heating power information and working frequency information of each wire coil, calculates working frequency to be output by each wire coil and working duration under the same frequency according to power requirements to be output, and controls each wire coil to work according to an operation result. Because the working frequency of the wire coil is related to the heating power and is influenced by a cooker, the heating area of the wire coil and the like, the working frequency of different wire coils is inconsistent. At the moment, the working frequency and the working duration of each wire coil are coordinated through preheating treatment, so that the problem of heating noise caused by the factors can be effectively solved. For example, when the coils in the electromagnetic oven interfere with each other, the output power of the coil 1 is 1000W, the operating frequency is a, the output power of the coil 2 is 500W, and the operating frequency is B, if the method of the present invention is not adopted, the operating frequencies of the two coils are not consistent, and therefore, the two coils interfere with each other to generate noise. After the method provided by the invention is adopted, the wire coil 1 continuously works at the working frequency A, the output power is 1000W, the wire coil 2 is switched and heated, the working frequency in the working state is A, and the purpose of the output power being 500W is achieved by controlling the working time of the wire coil 2 in a certain period. Because both coils operate at the same frequency a, the difference frequency noise during operation is avoided. Of course, the wire coil 1 and the wire coil 2 can also be switched and heated at the same time by adopting the working frequency C, and the requirement of output power can be met as long as the corresponding working time length is adjusted. Therefore, it is preferable that at least one of the coils is continuously operated at the first frequency, and the other coils are switched to heat.
In this embodiment, before the time-sharing preheating step, the method further includes a step of judging the number of the heating wire coils, if only one wire coil is needed to work, the required wire coil is controlled to enter a working state, otherwise, an interference judging step of judging whether interference exists between the wire coils is entered, if interference exists, the required wire coil is controlled to enter the time-sharing preheating step and the same-frequency switching heating step, and otherwise, the required wire coil is controlled to enter the working state. In the actual use process, for example, more than two wire coils are arranged in a single-head furnace, and only one wire coil needs to be started to meet the current power output requirement, or only one wire coil is arranged at each furnace end in the multi-head furnace, and only one wire coil needs to work, so that the condition of interference does not exist, the main controller directly enables the required wire coils to enter the working state, and the time-sharing preheating step and the same-frequency switching heating step are not required. Of course, before the single wire coil enters the working state, the discharging step before the working is also carried out, so that no noise is generated when the wire coil is started.
In this embodiment, in the interference determining step, if more than two wire coils are required to work and the distances between the wire coils required to work are greater than the interference threshold, the required wire coils are controlled to enter a working state, and if more than two wire coils are required to work and the distances between at least some of the wire coils required to work are less than the interference threshold, the wire coils with the distances less than the interference threshold are controlled to enter a time-sharing preheating step and a same-frequency switching heating step. In the actual use process, if the distance between the wire coils is large enough, the interference condition does not exist, and the master controller directly enables the wire coils with the large enough distance to enter the working state without entering a time-sharing preheating step and a same-frequency switching heating step. For another example, three wire coils need to be started, but the distance between the first wire coil and the other two wire coils is large enough and cannot be interfered, and the distance between the other two wire coils is small and interference exists, so that the master controller directly enables the first wire coil to enter a working state, and the other two wire coils enter a time-sharing preheating step and a common-frequency switching heating step. Of course, before the single wire coil enters the working state, the discharging step before the working is also carried out, so that no noise is generated when the wire coil is started. Preferably, the interference threshold is less than 150 mm.
In conclusion, the noise reduction method for the induction cooker with more than two wire coils can enable the wire coils of the induction cooker to be free of noise when the induction cooker is started and works and heats, and can greatly improve the use experience of users.
The features of the embodiments and embodiments described above may be combined with each other without conflict.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A noise reduction method for an induction cooker with more than two wire coils is characterized in that each wire coil is controlled by a main control module connected with the wire coil, each main control module is connected with a control panel and is controlled by a master controller of the control panel of the induction cooker, and the method comprises the following steps:
a pre-working discharging step, wherein before each wire coil enters a working state, a main control module connected with the wire coil detects a zero crossing point of alternating current input, a capacitor connected with the wire coil is discharged before the zero crossing point, and the wire coil enters the working state after the zero crossing point of the discharging is finished;
in the time-sharing preheating step, a master controller controls each wire coil to be in a working state in different time periods, and heating power and working frequency information of each wire coil are obtained;
and switching heating at the same frequency, wherein the master controller controls each wire coil to work at the same frequency according to the acquired heating power and working frequency information of each wire coil, and at least part of the wire coils are switched to heat, wherein the switching heating is that part of time periods of the wire coils are in a working state in a certain time period, and part of the time periods are in a stop state.
2. The method for reducing noise of an induction cooker with more than two wire coils as claimed in claim 1, wherein: in the same-frequency switching heating step, at least one wire coil is continuously in a working state at a first frequency, and other wire coils are switched to heat.
3. The method for reducing noise of an induction cooker with more than two wire coils as claimed in claim 1, wherein: before the time-sharing preheating step, the method further comprises a heating wire coil quantity judging step, if only one wire coil is needed to work, the required wire coil is controlled to enter a working state, otherwise, an interference judging step of judging whether interference exists between the wire coils is carried out, if the interference exists, the required wire coil is controlled to enter the time-sharing preheating step and the same-frequency switching heating step, and otherwise, the required wire coil is controlled to enter the working state.
4. The method for reducing noise of an induction cooker with more than two coils according to claim 3, wherein the method comprises the following steps: in the interference judging step, if more than two wire coils are required to work and the distances between the wire coils required to work are larger than an interference threshold value, the required wire coils are controlled to enter a working state, and if the distances between at least part of the wire coils required to work and the more than two wire coils are smaller than the interference threshold value, the wire coils with the distances smaller than the interference threshold value are controlled to enter the time-sharing preheating step and the same-frequency switching heating step.
5. The method for reducing noise of an induction cooker with more than two wire coils as claimed in claim 4, wherein: the interference threshold is less than 150 mm.
6. The noise reduction method for an induction cooker with more than two coils according to any one of claims 1 to 5, characterized in that: in the pre-working discharging step, the discharging process is in a fixed PWM output mode, and meanwhile, the IGBT is driven by using a first voltage which is more than or equal to the turn-on threshold voltage of the IGBT and less than 15V.
7. The method for reducing noise of an induction cooker with more than two wire coils as claimed in claim 6, wherein: and in the discharging process, the PWM output time is more than or equal to 1ms and less than or equal to 8 ms.
8. The method for reducing noise of an induction cooker with more than two wire coils as claimed in claim 6, wherein: and in the discharging process, the PWM output frequency is more than or equal to 50KHz and less than or equal to 100 KHz.
9. The method for reducing noise of an induction cooker with more than two wire coils as claimed in claim 6, wherein: and in the discharging process, the pulse width time for controlling the IGBT to be switched on in a single PWM period is less than 2 us.
10. The method for reducing noise of an induction cooker with more than two wire coils as claimed in claim 6, wherein: after the discharging process is completed, the PPG output mode is adopted at the zero crossing point, and meanwhile, the IGBT is driven by a second voltage, wherein the second voltage is 15V or 18V.
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| CN201014584Y (en) * | 2007-01-29 | 2008-01-30 | 陈俊平 | Multi-stove burner electromagnetic stove |
| CN107302809A (en) * | 2016-08-18 | 2017-10-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic Heating cooking system and its heating control apparatus and control method |
| CN107561349A (en) * | 2017-08-18 | 2018-01-09 | 九阳股份有限公司 | The zero passage detection and voltage sampling method and circuit of electromagnetic heater |
| US20180206294A1 (en) * | 2016-02-02 | 2018-07-19 | Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co ., Limited | Electromagnetic heating device and heating control circuit thereof, and low power heating control method |
| CN112113246A (en) * | 2020-08-27 | 2020-12-22 | 中山爱它电器科技有限公司 | Noise reduction method and control device for multi-head induction cooker |
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2021
- 2021-01-12 CN CN202110034484.1A patent/CN112555925B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201014584Y (en) * | 2007-01-29 | 2008-01-30 | 陈俊平 | Multi-stove burner electromagnetic stove |
| US20180206294A1 (en) * | 2016-02-02 | 2018-07-19 | Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co ., Limited | Electromagnetic heating device and heating control circuit thereof, and low power heating control method |
| CN107302809A (en) * | 2016-08-18 | 2017-10-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic Heating cooking system and its heating control apparatus and control method |
| CN107561349A (en) * | 2017-08-18 | 2018-01-09 | 九阳股份有限公司 | The zero passage detection and voltage sampling method and circuit of electromagnetic heater |
| CN112113246A (en) * | 2020-08-27 | 2020-12-22 | 中山爱它电器科技有限公司 | Noise reduction method and control device for multi-head induction cooker |
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