CN106162970B - Electromagnetic heating device and electromagnetic oven with same - Google Patents
Electromagnetic heating device and electromagnetic oven with same Download PDFInfo
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- CN106162970B CN106162970B CN201510164854.8A CN201510164854A CN106162970B CN 106162970 B CN106162970 B CN 106162970B CN 201510164854 A CN201510164854 A CN 201510164854A CN 106162970 B CN106162970 B CN 106162970B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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Abstract
The invention discloses an electromagnetic heating device and an induction cooker, wherein the device comprises: a power supply module; the resonance module is provided with a harmonic oscillator module consisting of a resonance inductor and a resonance capacitor, wherein the first end of the resonance inductor is connected with the power supply module, and the first end of the resonance capacitor is connected with the second end of the resonance inductor; the capacitance adjusting module is used for adjusting the capacitance value of the resonance capacitor in the resonance module, and comprises: a first end of the switch is connected with a first end of the resonant inductor, and a second end of the switch is connected with a second end of the resonant capacitor; the first end of the adjusting capacitor is connected with the second end of the switch, and the second end of the adjusting capacitor is grounded; the controller controls the switch to be switched on or switched off; and the switch module is connected with the second end of the resonant inductor in the resonant module. The device has realized that heating power heats in certain frequency (for example 200 watts to 2000 watts) within range continuously, has improved culinary art food effect, has promoted user experience.
Description
Technical Field
The invention relates to the technical field of electromagnetic heating, in particular to an electromagnetic heating device and an induction cooker with the same.
Background
With the rapid development of the field of electromagnetic heating, the induction cooker has become the mainstream kitchen ware in the kitchen of people. At present, an electromagnetic oven mainly cooks food in an electromagnetic induction mode, the output power is very high and generally can reach 2000 watts, in order to reduce the loss of a switching tube in the electromagnetic oven, the switching tube needs to be operated in a soft switching state, and the existing scheme generally adopts an LC resonance (wherein L is inductance, and C is capacitance) heating scheme. However, because the resonant circuit has the frequency-selective characteristic, only when the working frequency of the switching tube is consistent with the LC resonant frequency, the output power of the switching tube is maximum, and the working state is optimal; when the working frequency of the switching tube deviates from the LC resonance frequency, the output power of the resonance circuit is smaller, and the working state is poorer.
For example, in the existing single-tube LC resonant electromagnetic heating scheme, because the inductance L of the coil panel (i.e. resonant induction) and the capacitance C of the resonant capacitor are a set of fixed values, when the switching tube operates in a frequency range of a certain power (e.g. 2000 watts) (about 20KHz), the optimal state is reached, and the switching frequency of the switching tube is higher, the power is lower, the operating state is worse, specifically, the switching tube gradually exits from the soft-switching state and enters into the hard-switching state, and the temperature rise of the switching tube is higher, so that the existing single-tube LC resonant electromagnetic heating scheme can only continuously heat in a range of, for example, 1000 watts to 2000 watts, and can realize low-power heating in an intermittent heating manner when the temperature is lower than 1000 watts, for example, 500 watts heating is realized, 1000 watts heating is used for 5 seconds, and then heating is stopped for 5 seconds, but the intermittent heating manner has a poor cooking effect, and cannot meet the user requirements.
Disclosure of Invention
The object of the present invention is to solve at least to some extent one of the above mentioned technical problems.
To this end, a first object of the invention is to propose an electromagnetic heating device. The device can realize continuous heating of output power in a certain frequency (such as 200 watts to 2000 watts), and the device has the advantages of obviously improving the food cooking effect and improving the satisfaction degree of users.
The second purpose of the invention is to provide an induction cooker.
In order to achieve the above object, an electromagnetic heating apparatus according to an embodiment of a first aspect of the present invention includes: a power supply module; the resonance module is connected with the power supply module and provided with a resonance sub-module consisting of a resonance inductor and a resonance capacitor, wherein the first end of the resonance inductor is connected with the power supply module, and the first end of the resonance capacitor is connected with the second end of the resonance inductor; a capacitance adjustment module for adjusting a capacitance value of a resonance capacitor in the resonance module, the capacitance adjustment module comprising: a first end of the switch is connected with a first end of the resonant inductor, and a second end of the switch is connected with a second end of the resonant capacitor; a first end of the adjusting capacitor is connected with a second end of the switch, and the second end of the adjusting capacitor is grounded; a controller that controls the switch to be turned on or off; and the switch module is connected with the second end of the resonance inductor in the resonance module.
According to the electromagnetic heating device provided by the embodiment of the invention, the continuous heating of the output power in a certain frequency range (such as 200-2000 watts) can be realized by adding the capacitance adjusting module, compared with the prior art, the aim of low-power continuous heating is realized, the food cooking effect is obviously improved, and the user satisfaction is improved.
In an embodiment of the present invention, when the heating power of the electromagnetic heating apparatus is greater than a set power value, the controller closes the switch, and when the heating power of the electromagnetic heating apparatus is less than the set power value, opens the switch.
In an embodiment of the invention, the switch is a relay.
In an embodiment of the invention, the switch is a metal-oxide semiconductor field effect transistor MOSFET or an insulated gate bipolar transistor IGBT.
According to one embodiment of the invention, the power supply module comprises: the rectifier is connected with a power supply; the first end of the inductor is connected with the output end of the rectifier, and the second end of the inductor is connected with the first end of the resonant inductor; and the first end of the filter capacitor is connected with the second end of the inductor, and the second end of the filter capacitor is grounded.
In order to achieve the above object, an induction cooker according to an embodiment of a second aspect of the present invention includes: the electromagnetic heating device of the embodiment of the first aspect of the invention.
According to the electromagnetic oven provided by the embodiment of the invention, the capacitance adjusting module is added in the electromagnetic heating device, so that the continuous heating of the output power in a certain frequency (such as 200-2000 watts) range can be realized.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which,
fig. 1 is a schematic structural view of an electromagnetic heating apparatus according to an embodiment of the present invention; and
fig. 2 is a schematic circuit diagram of an electromagnetic heating apparatus according to an embodiment of the present invention.
Reference numerals:
10: a power supply module; 20, a resonance module; 21: a resonating submodule; 30: a capacitance adjustment module; 31: a controller; 40: a switch module; d: a rectifier; d 1: an output of the rectifier; l2: an inductance; l 1: a first end of an inductor; l 2: a second terminal of the inductor; c0: a filter capacitor; e1: a first terminal of a filter capacitor; e2: a second terminal of the filter capacitor; l1: a resonant inductor; p1: a first end of a resonant inductor; p2: a second end of the resonant inductor; k: a switch; k 1: a first end of a switch; k 2: a second terminal of the switch; c1: a resonant capacitance; a1: a first terminal of a resonant capacitor; a2: a second terminal of the resonant capacitor; c2: adjusting the capacitance; b1: adjusting a first end of the capacitor; b2: adjusting a second end of the capacitor; q1: a switching tube; e: and an emitter of the switching tube.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An electromagnetic heating apparatus and an induction cooker having the same according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of an electromagnetic heating apparatus according to an embodiment of the present invention. Fig. 2 is a schematic circuit diagram of an electromagnetic heating apparatus according to an embodiment of the present invention. As shown in fig. 1 and 2, the electromagnetic heating apparatus may include: a power module 10, a resonance module 20 (not shown in fig. 2), a capacitance adjustment module 30 and a switching module 40. Specifically, the capacitance adjusting module 30 may be used to adjust a capacitance value of a resonant capacitor in the resonant module 20. It should be noted that, in one embodiment of the present invention, there may be one or more capacitance adjusting modules 30. That is, one or more capacitance adjusting modules 30 may be provided in the electromagnetic heating apparatus to adjust the resonant capacitance capacity in the resonant module 20.
In the embodiment of the present invention, as shown in fig. 1 and fig. 2, the resonance module 20 is connected to the power module 10, and the resonance module 20 has a resonance sub-module 21 formed by a resonance inductor L1 and a resonance capacitor C1. As shown in fig. 2, the first terminal P1 of the resonant inductor L1 is connected to the power module 10, and the first terminal a1 of the resonant capacitor C1 is connected to the second terminal P2 of the resonant inductor L1. In addition, as shown in fig. 2, the switching module 40 is connected to the second terminal P2 of the resonant inductor L1 in the resonant module 20.
In addition, in an embodiment of the present invention, as shown in fig. 2, the capacitance adjusting module 30 may include: a switch K, an adjusting capacitor C2 and a controller 31 (not shown in fig. 2), wherein a first terminal K1 of the switch K is connected to a first terminal P1 of the resonant inductor L1, a second terminal K2 of the switch K is connected to a second terminal a2 of the resonant capacitor C1, a first terminal B1 of the adjusting capacitor C2 is connected to a second terminal K2 of the switch K, a second terminal B2 of the adjusting capacitor C2 is grounded, and a second terminal B2 of the adjusting capacitor C2 is also connected to an emitter E of a switching tube Q1 in the switching module 40.
Specifically, the controller 31 may control the closing or opening of the switch K. In the embodiment of the present invention, when the heating power of the electromagnetic heating device is greater than the set power value, the controller 31 may close the switch K, and when the heating power of the electromagnetic heating device is less than the set power value, open the switch K. Wherein, in one embodiment of the present invention, the switch K may be a relay. In another embodiment of the present invention, the switch K may be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) or an IGBT (Insulated Gate Bipolar Transistor).
Further, in an embodiment of the present invention, as shown in fig. 2, the power module 10 may include a rectifier D, an inductor L2, and a filter capacitor C0, the rectifier D is connected to the power source, a first terminal L1 of the inductor L2 is connected to an output terminal D1 of the rectifier D, a second terminal L2 of the inductor L2 is connected to a first terminal P1 of the resonant inductor L1, a first terminal E1 of the filter capacitor C0 is connected to a second terminal L2 of the inductor L2, and a second terminal E2 of the filter capacitor C0 is grounded.
In order to make the advantages of the present invention more obvious for those skilled in the art, the operation principle of the electromagnetic heating device of the present invention will be further described with reference to fig. 2.
As shown in fig. 2, when the electromagnetic heating apparatus works in a high power state, that is, the heating power of the electromagnetic heating apparatus is greater than a set power value (for example, 1000 watts), the controller 31 may control the switch K to close, the resonant inductor L1 and the resonant capacitor C1 form a parallel resonant circuit, the adjusting capacitor C2 and the filter capacitor C0 form a filter capacitor, and at this time, the capacitance of the equivalent capacitor of the resonant circuit is the capacitance of the resonant capacitor C1, and then the resonant frequency f is obtained 0 Comprises the following steps:
wherein L is inductance in the resonant circuit, C 1 Is the equivalent capacitance capacity in the resonant tank.
In a preferred state, when the resonant frequency f 0 When the value of (2) is 20KHz, and the PWM (Pulse Width Modulation) signal of the switching tube Q1 in the switching module 40 is 20KHz, the electromagnetic heating device is in the optimal state, and at this time, the collector of the switching tube Q1 is just switched on at the voltage zero crossing, and is in the soft switching state, and the switching loss of the switching tube Q1 is minimum. When the high-level pulse width of the PWM is gradually reduced, the on-time of the switching tube Q1 is reduced, so that after the synchronous circuit, the period time of the PWM is reduced, and the frequency of the PWM is increased to gradually get away from the optimal resonant frequency f 0 (ii) a On the other hand, the energy stored in the resonant inductor L1 is reduced, the output power is gradually reduced, when the switching transistor Q1 is turned on, there is not enough energy to reduce the voltage of the resonant capacitor C1 to 0V, and the switching transistor Q1 gradually enters a hard switching state, so that the switching loss of the switching transistor Q1 is increased.
When the electromagnetic heating device works in a low-power state, that is, the heating power of the electromagnetic heating device is smaller than a set power value (for example, 1000 watts), the controller 31 may control the switch K to be turned off, the resonant inductor L1, the resonant capacitor C1 and the adjusting capacitor C2 form a series resonant circuit, the adjusting capacitor C2 participates in the resonant operation, at this time, the equivalent capacitor capacity of the resonant circuit is the sum of the capacities of the resonant capacitor C1 and the adjusting capacitor C2 in series, and then the resonant frequency f is obtained 1 Comprises the following steps:
wherein L is inductance in the resonant circuit, C 1 The capacity of the resonant capacitor C1, C 2 To adjust the capacitance of the capacitor C2.
Since the resonant capacitor C1 and the adjusting capacitor C2 are connected in series, the total capacitance in the resonant circuit is reduced, and the resonant frequency f of the electromagnetic heating device is reduced 1 Increase, preferably, the resonant frequency f 1 The value of (2) is 35KHz, because the high level pulse width that reduces PWM can reduce output power, can reduce PWM's cycle simultaneously, improves PWM's frequency, and supposing that output power is 900 watt-hours, switching tube Q1's drive frequency is 35KHz, because behind the disconnection of switch K, electromagnetic heating device's resonant frequency f 1 The voltage rises to 35KHz and is consistent with the driving frequency of the switching tube Q1, so that the electromagnetic heating device works in the optimal state at the moment, the collector of the switching tube Q1 is just conducted under the voltage zero crossing, the soft switching state is realized, the switching loss of the switching tube Q1 is minimum, and the low-power continuous heating is realized.
According to the electromagnetic heating device provided by the embodiment of the invention, the continuous heating of the output power in a certain frequency (such as 200-2000 watts) range can be realized by adding the capacitance adjusting module, compared with the prior art, the aim of low-power continuous heating is realized, the food cooking effect is obviously improved, and the user satisfaction is improved.
In order to achieve the above embodiments, the present invention further provides an induction cooker, which includes the electromagnetic heating apparatus of any one of the above embodiments.
According to the electromagnetic oven provided by the embodiment of the invention, the capacitance adjusting module is added in the electromagnetic heating device, so that the continuous heating of the output power in a certain frequency (such as 200-2000 watts) range can be realized.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. An electromagnetic heating device, comprising:
a power supply module;
the resonance module is connected with the power supply module and is provided with a harmonic oscillator module consisting of a resonance inductor and a resonance capacitor, wherein the first end of the resonance inductor is connected with the power supply module, and the first end of the resonance capacitor is connected with the second end of the resonance inductor;
a capacitance adjustment module for adjusting a capacitance value of a resonance capacitor in the resonance module, the capacitance adjustment module comprising:
a first end of the switch is connected with a first end of the resonant inductor, and a second end of the switch is connected with a second end of the resonant capacitor;
a first end of the adjusting capacitor is connected with a second end of the switch, and the second end of the adjusting capacitor is grounded;
a controller that controls the switch to be turned on or off; and
and the switch module is connected with the second end of the resonance inductor in the resonance module.
2. The electromagnetic heating apparatus according to claim 1, wherein the controller closes the switch when the heating power of the electromagnetic heating apparatus is greater than a set power value, and opens the switch when the heating power of the electromagnetic heating apparatus is less than the set power value.
3. Electromagnetic heating device according to claim 2, wherein said switch is a relay.
4. Electromagnetic heating device according to claim 2, wherein said switch is a metal-oxide semiconductor field effect transistor MOSFET or an insulated gate bipolar transistor IGBT.
5. Electromagnetic heating device according to claim 1 or 2, characterized in that said power supply module comprises:
the rectifier is connected with a power supply;
the first end of the inductor is connected with the output end of the rectifier, and the second end of the inductor is connected with the first end of the resonant inductor;
and the first end of the filter capacitor is connected with the second end of the inductor, and the second end of the filter capacitor is grounded.
6. An induction cooking hob, characterized in, that it comprises an electromagnetic heating device according to any one of the claims 1-5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510164854.8A CN106162970B (en) | 2015-04-07 | 2015-04-07 | Electromagnetic heating device and electromagnetic oven with same |
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| CN201510164854.8A CN106162970B (en) | 2015-04-07 | 2015-04-07 | Electromagnetic heating device and electromagnetic oven with same |
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| CN106162970B true CN106162970B (en) | 2022-09-06 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107172733B (en) * | 2017-07-03 | 2020-07-28 | 安吉信多达智能科技有限公司 | Electromagnetic heating system and working method thereof |
| CN110801144B (en) * | 2018-08-06 | 2021-07-20 | 佛山市顺德区美的电热电器制造有限公司 | Control method and system of cooking device and cooking device |
| CN110811312B (en) * | 2018-08-07 | 2021-07-20 | 佛山市顺德区美的电热电器制造有限公司 | Cooking appliance and control device and control method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204145789U (en) * | 2014-09-25 | 2015-02-04 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic Heating control device and electromagnetic heating apparatus |
| CN204539512U (en) * | 2015-04-07 | 2015-08-05 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater and the electromagnetic oven with it |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204145789U (en) * | 2014-09-25 | 2015-02-04 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic Heating control device and electromagnetic heating apparatus |
| CN204539512U (en) * | 2015-04-07 | 2015-08-05 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater and the electromagnetic oven with it |
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