CN109302758B - Electromagnetic heating system and control circuit and method thereof - Google Patents
Electromagnetic heating system and control circuit and method thereof Download PDFInfo
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- CN109302758B CN109302758B CN201710612546.6A CN201710612546A CN109302758B CN 109302758 B CN109302758 B CN 109302758B CN 201710612546 A CN201710612546 A CN 201710612546A CN 109302758 B CN109302758 B CN 109302758B
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- 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
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Abstract
The invention discloses an electromagnetic heating system and a control circuit and a method thereof, wherein the electromagnetic heating system comprises a rectifying circuit, a filter circuit and a resonant heating circuit, and the control circuit comprises: the first sampling circuit is used for acquiring the working current of the resonant heating circuit to obtain a working current sampling value; the second sampling circuit is used for acquiring the power supply voltage of the power supply to obtain a power supply voltage sampling value; the third sampling circuit is used for acquiring the power supply voltage of the resonant heating circuit to obtain a power supply voltage sampling value; and the control chip acquires the type of the power supply according to the power supply voltage sampling value, acquires the target working current of the resonant heating circuit according to the type of the power supply, the power supply voltage sampling value and the target power of the electromagnetic heating system, and controls a power switch tube in the resonant heating circuit according to the working current sampling value and the target working current of the resonant heating circuit. Therefore, heating control of the electromagnetic heating system under different types of power supplies is achieved.
Description
Technical Field
The invention relates to the field of electromagnetic heating, in particular to a control circuit of an electromagnetic heating system, the electromagnetic heating system and a control method of the electromagnetic heating system.
Background
The power supply of the traditional household appliance with the electromagnetic heating function or the industrial electromagnetic smelting equipment is directly supplied by mains supply, so that the resonant circuit performs resonant operation based on the mains supply or variable frequency alternating current. When the characteristics of a mains supply are changed or non-alternating current is used for simulating power supply, the control mode, the target power, the self-protection mode and the like of electromagnetic heating can be changed due to the change of the current sampling characteristics of the whole machine, and the traditional electromagnetic heating scheme cannot realize an effective electromagnetic heating function.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above.
Therefore, a first object of the present invention is to provide a control circuit for an electromagnetic heating system, which can realize heating control of the electromagnetic heating system under different types of power supplies.
A second object of the present invention is to provide an electromagnetic heating system.
A third object of the present invention is to provide a control method of an electromagnetic heating system.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a control circuit of an electromagnetic heating system, where the electromagnetic heating system includes a rectification circuit, a filter circuit, and a resonant heating circuit, and the control circuit includes: the first sampling circuit is used for collecting the working current of the resonance heating circuit to obtain a working current sampling value; the second sampling circuit is used for collecting the power supply voltage of the power supply to obtain a power supply voltage sampling value; the third sampling circuit is used for collecting the power supply voltage of the resonant heating circuit to obtain a power supply voltage sampling value; the control chip is respectively connected with the output end of the first sampling circuit, the output end of the second sampling circuit and the output end of the third sampling circuit, and the control chip is used for acquiring the type of the power supply according to the power supply voltage sampling value, acquiring the target working current of the resonant heating circuit according to the type of the power supply, the power supply voltage sampling value and the target power of the electromagnetic heating system, and generating a control signal according to the working current sampling value and the target working current of the resonant heating circuit so as to control a power switch tube in the resonant heating circuit.
According to the control circuit of the electromagnetic heating system, the third sampling circuit is used for collecting the power supply voltage of the resonant heating circuit, the control chip is used for obtaining the type of the power supply according to the power supply voltage, the second sampling circuit is used for collecting the power supply voltage of the power supply, the control chip is used for obtaining the target working current of the resonant heating circuit according to the type of the power supply, the power supply voltage sampling value and the target power of the electromagnetic heating system, the first sampling circuit is used for collecting the working current of the resonant heating circuit, and the control chip is used for controlling the power switch tube in the resonant heating circuit according to the working current sampling value and the target working current of the resonant heating circuit. Therefore, heating control of the electromagnetic heating system under different types of power supplies is achieved.
In addition, the control circuit of the electromagnetic heating system according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the control circuit further includes: and the fourth sampling circuit is used for collecting the resonance voltage of the resonance heating circuit and sending the resonance voltage to the control chip so that the control chip controls the electromagnetic heating system to stop working when judging that the resonance voltage is abnormal.
According to an embodiment of the present invention, in an operating process of the electromagnetic heating system, the control chip is further configured to determine whether any one of a supply voltage of the resonant heating circuit, a supply voltage of the power supply, and the target power changes, wherein if any one of the supply voltage of the resonant heating circuit, the supply voltage of the power supply, and the target power changes, the control chip reacquires the target operating current of the resonant heating circuit; and if the power supply voltage of the resonant heating circuit, the power supply voltage of the power supply and the target power are not changed, the control chip maintains the control signal currently output to the resonant heating circuit unchanged.
According to one embodiment of the present invention, the first sampling circuit includes: one end of the first resistor is connected with the negative input end of the rectifying circuit and then grounded, and the other end of the first resistor is respectively connected with the filter circuit and the resonant heating circuit; one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is connected with a working current sampling end of the control chip; and one end of the first filter capacitor is connected with the other end of the second resistor, and the other end of the first filter capacitor is grounded.
According to one embodiment of the present invention, the second sampling circuit includes: one end of the third resistor is connected with the positive output end of the power supply; one end of the fourth resistor is connected with the negative output end of the power supply, the other end of the fourth resistor is connected with the other end of the third resistor to form a first node, and the first node is connected with the power supply voltage sampling end of the control chip; one end of the fifth resistor is connected with the first node, and the other end of the fifth resistor is grounded; and one end of the second filter capacitor is connected with the first node, and the other end of the second filter capacitor is grounded.
According to one embodiment of the invention, the types of power supply include an alternating current power supply, a direct current power supply and a direct current power supply.
According to an embodiment of the invention, the topology of the resonant heating circuit is one of a single tube resonant topology, a half-bridge resonant topology, an asymmetric half-bridge resonant topology and a full-bridge resonant topology.
Further, the present invention provides an electromagnetic heating system, which includes the control circuit of the electromagnetic heating system of the above embodiment of the present invention.
According to the electromagnetic heating system provided by the embodiment of the invention, the control circuit of the electromagnetic heating system provided by the embodiment is adopted, so that heating work under different types of power supplies can be realized, and the compatibility of the electromagnetic heating system to the power supplies is good.
In order to achieve the above object, a third embodiment of the present invention provides a control method for an electromagnetic heating system, including the following steps: collecting the working current of the resonant heating circuit to obtain a working current sampling value; collecting the power supply voltage of a power supply to obtain a power supply voltage sampling value; collecting the power supply voltage of the resonant heating circuit to obtain a power supply voltage sampling value; acquiring the type of the power supply according to the power supply voltage sampling value, and acquiring a target working current of the resonant heating circuit according to the type of the power supply, the power supply voltage sampling value and the target power of the electromagnetic heating system; and generating a control signal according to the working current sampling value and the target working current of the resonant heating circuit so as to control a power switch tube in the resonant heating circuit.
According to the control method of the electromagnetic heating system, the power supply voltage of the resonant heating circuit is collected, the type of the power supply is obtained according to the power supply voltage, the power supply voltage of the power supply is collected, the target working current of the resonant heating circuit is obtained according to the type of the power supply, the power supply voltage sampling value and the target power of the electromagnetic heating system, the working current of the resonant heating circuit is collected, and the power switch tube in the resonant heating circuit is controlled according to the working current sampling value and the target working current of the resonant heating circuit. Therefore, heating control of the electromagnetic heating system under different types of power supplies is achieved.
In addition, the control method of the electromagnetic heating system according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the control method further includes: collecting the resonance voltage of the resonance heating circuit, and judging the resonance voltage; and when the resonance voltage is abnormal, controlling the electromagnetic heating system to stop working.
According to an embodiment of the present invention, in an operating process of the electromagnetic heating system, it is further determined whether any one of a supply voltage of the resonant heating circuit, a supply voltage of the power supply and the target power is changed, wherein if any one of the supply voltage of the resonant heating circuit, the supply voltage of the power supply and the target power is changed, a target operating current of the resonant heating circuit is obtained again; and if the power supply voltage of the resonant heating circuit, the power supply voltage of the power supply and the target power are not changed, maintaining the control signal currently output to the resonant heating circuit unchanged.
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 block diagram of a control circuit of an electromagnetic heating system according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of the type of power supply according to an embodiment of the invention;
FIG. 3 is a block diagram of a control circuit of an electromagnetic heating system according to another embodiment of the present invention;
FIG. 4 is a circuit diagram of a control circuit of an electromagnetic heating system in accordance with a specific embodiment of the present invention;
FIG. 5 is a topological structure diagram of a resonant heating circuit in accordance with an embodiment of the present invention;
fig. 6 is a control flow diagram of a control circuit of an electromagnetic heating system according to an embodiment of the present invention;
FIG. 7 is a block diagram of an electromagnetic heating system according to an embodiment of the present invention;
fig. 8 is a flowchart of a control method of an electromagnetic heating system according to an embodiment of the present invention.
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 system, a control circuit thereof, and a method thereof according to an embodiment of the present invention are described below with reference to the drawings.
Fig. 1 is a block diagram of a control circuit of an electromagnetic heating system according to one embodiment of the present invention.
In the embodiment of the present invention, as shown in fig. 1, the electromagnetic heating system includes a rectifying circuit 1, a filter circuit 2, and a resonant heating circuit 3. The control circuit includes a first sampling circuit 10, a second sampling circuit 20, a third sampling circuit 30, and a control chip 40.
The first sampling circuit 10 is configured to collect an operating current of the resonant heating circuit 3 to obtain an operating current sampling value. The second sampling circuit 20 is configured to collect a power supply voltage of the power supply to obtain a power supply voltage sampling value. The third sampling circuit 30 is configured to collect a supply voltage of the resonant heating circuit 3 to obtain a supply voltage sampling value. The control chip 40 is connected to the output end of the first sampling circuit 10, the output end of the second sampling circuit 20, and the output end of the third sampling circuit 30, respectively, and the control chip 40 is configured to obtain the type of the power supply according to the power supply voltage sampling value, obtain the target working current of the resonant heating circuit 3 according to the type of the power supply, the power supply voltage sampling value, and the target power of the electromagnetic heating system, and generate a control signal according to the working current sampling value and the target working current of the resonant heating circuit 3, so as to control a power switching tube in the resonant heating circuit.
In an embodiment of the invention, referring to fig. 2, the types of power supplies include an alternating current power supply AC, a direct current power supply DC, and an alternating current power supply AC + DC.
Specifically, the alternating current power supply AC may be a commercial power supply, a variable frequency power supply, or the like, and the effective value voltage range thereof may be 0 to 310V; the voltage range of the direct current power supply DC can be 0-310V; the alternating current-direct current power supply AC + DC can be alternating current AC with waveforms of sine waves, triangular waves, power frequency rectification waves and the like superposed on the direct current DC, the effective value voltage range of the alternating current-direct current power supply AC + DC can be 0-310V, and the alternating current-direct current power supply AC + DC is rectified by the rectification circuit 1 and filtered by the filter circuit 2 and then is input into the resonant heating circuit 3.
It can be understood that the types of the power supplies are different, and the waveforms of the power supply voltages of the resonant heating circuits obtained by rectifying the power supply by the rectifying circuit 1 and filtering the power supply by the filter circuit 2 are different, that is, the power supply voltage sampling values are different, so that the control chip 40 can judge the types of the power supplies according to the power supply voltage sampling values.
It should be noted that, when the type and the voltage effective value of the power supply are the same, if the target power of the electromagnetic heating system is different, the target working current of the corresponding resonant heating circuit 3 is also different; when the target power of the electromagnetic heating system is the same, even if the voltage effective value of the power supply is the same, if the types of the power supply are different, the target working current of the corresponding resonant heating circuit 3 is also different.
In the embodiment of the present invention, the type and the effective voltage value of the power supply, the target power of the electromagnetic heating system, and the target working current of the resonant heating circuit 3 are in a corresponding relationship, and the corresponding relationship may be obtained through experiments. Furthermore, the obtained corresponding relationship may be stored in a preset form (e.g., a table form), so that after the type of the power supply, the power supply voltage sampling value (i.e., the voltage effective value of the power supply) and the target power of the electromagnetic heating system are obtained, the table is called to obtain the corresponding target operating current of the resonant heating circuit 3.
In one embodiment of the present invention, the electromagnetic heating system may be disposed in a cooking appliance, and an operation interface may be disposed on the cooking appliance, so that a user can input a target power of the electromagnetic heating system and start a heating function of the electromagnetic heating system through the operation interface. After the heating function of the electromagnetic heating system is started, the control chip may first control the electromagnetic heating system to operate at a preset power (e.g., 1000-2000W) for a preset time (e.g., 10 ms-1 s), and within the preset time, the third sampling circuit 30 collects the power supply voltage of the resonant heating circuit 3 to obtain a power supply voltage sampling value, so that the control chip 40 determines the type of the power supply according to the power supply voltage sampling value.
Further, the second sampling circuit 20 collects the power supply voltage of the power supply to obtain a power supply voltage sampling value, the control chip 40 obtains the target power input by the user through the operation interface, and the control chip 40 can obtain the target working current of the resonant heating circuit 3 through a table look-up method according to the type of the power supply, the target power and the power supply voltage sampling value.
Furthermore, during the operation of the electromagnetic heating system, the first sampling circuit 10 collects the operating current of the resonant heating circuit 3 to obtain the operating current sampling value. The control chip 40 may generate a control signal according to the working current sampling value and the target working current of the resonant heating circuit 3, so as to control the power switch tube in the resonant heating circuit 3.
Therefore, the control circuit of the electromagnetic heating system can realize heating control on the electromagnetic heating system when the types of the power supplies are different, and the power supplies are good in compatibility.
In an embodiment of the present invention, as shown in fig. 3, the control circuit further includes a fourth sampling circuit 50, and the fourth sampling circuit 50 is configured to collect a resonant voltage of the resonant heating circuit 3 and send the resonant voltage to the control chip 40, so that the control chip 40 controls the electromagnetic heating system to stop working when determining that the resonant voltage is abnormal.
Further, in the working process of the electromagnetic heating system, the control chip 40 is further configured to determine whether any one of the power supply voltage of the resonant heating circuit 3, the power supply voltage of the power supply, and the target power changes. If any one of the supply voltage of the resonant heating circuit 3, the supply voltage of the power supply and the target power is changed, the control chip 40 reacquires the target working current of the resonant heating circuit 3; if the supply voltage of the resonant heating circuit 3, the supply voltage of the power supply and the target power are not changed, the control chip 40 maintains the control signal currently output to the resonant heating circuit 3 unchanged.
In one example of the present invention, as shown in fig. 4, the first sampling circuit 10 includes a first resistor R1, a second resistor R2, and a first filter capacitor C1.
One end of the first resistor R1 is connected with the negative input end of the rectifying circuit 1 and then grounded, and the other end of the first resistor R1 is connected with the filter circuit 2 and the resonant heating circuit 3 respectively. One end of the second resistor R2 is connected to the other end of the first resistor R1, and the other end of the second resistor R2 is connected to the working current sampling end of the control chip 40. One end of the first filter capacitor C1 is connected to the other end of the second resistor R2, and the other end of the first filter capacitor C1 is grounded.
Specifically, the first resistor R1 is a sampling resistor, and the resistance value thereof may be 1-10 m Ω; the second resistor R2 is a current-limiting resistor with a resistance value of 1-50 k omega; the capacitance value of the first filter capacitor C1 may be 10pf 100 nf. Because the topological structure switch of the resonant heating circuit 3 is a high-frequency signal, the influence of the noise of the whole electromagnetic heating system is added, and the resistance value of the first resistor R1 is very small, after passing through the second resistor R2 and the first filter capacitor C1, the sampling signal corresponding to the working current sampling value is a relatively stable direct-current voltage, and the amplitude can be 0.1-1V, for example.
Further, referring to fig. 4, the second sampling circuit 20 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a second filter capacitor C2.
One end of the third resistor R3 is connected to the positive output end of the power supply. One end of the fourth resistor R4 is connected to the negative output terminal of the power supply, the other end of the fourth resistor R4 is connected to the other end of the third resistor R3, and a first node a is formed, and the first node a is connected to the power supply voltage sampling terminal of the control chip 40. One end of the fifth resistor R5 is connected to the first node a, and the other end of the fifth resistor R5 is grounded. One end of the second filter capacitor C2 is connected to the first node a, and the other end of the second filter capacitor C2 is grounded.
Specifically, the third resistor R3 and the fourth resistor R4 are current-limiting resistors, the fifth resistor R5 is a shunt resistor, and in order to eliminate the influence of the noise of the power supply, the power supply voltage can be converted into a direct-current voltage with a peak value in proportion to the power supply voltage after passing through the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the second filter capacitor C2.
In one example of the present invention, referring to fig. 4, the third sampling circuit 30 includes a sixth resistor R6, and the fourth sampling circuit 50 includes a seventh resistor R7, wherein the sixth resistor R6 and the seventh resistor R7 are sampling resistors.
In an embodiment of the present invention, referring to fig. 5, the topology of the resonant heating circuit 3 is one of a single tube resonant topology (1), a half-bridge resonant topology (2), an asymmetric half-bridge resonant topology (3), and a full-bridge resonant topology (4).
In addition, referring to fig. 4, in the embodiment of the present invention, the rectifier circuit 1 may be a full bridge rectifier circuit. The filter circuit 2 may include a filter capacitor C4, a choke coil L1, and a storage capacitor C5. The capacitance range of the filter capacitor C4 can be 0.1-1 uf, the inductance range of the choke coil L1 can be 100-500 uh, the capacitance range of the energy storage capacitor C5 can be 1-10 uf, and the type of the power supply can be accurately judged according to the voltage waveforms at the two ends of the energy storage capacitor C5.
In a specific example of the present invention, as shown in fig. 6, after the user starts the electromagnetic heating system, the fourth sampling circuit 50 collects the resonance voltage of the resonance heating circuit 3 and transmits the resonance voltage to the control chip 40. If the control chip 40 determines that the resonant voltage is not abnormal, the control chip 40 controls the electromagnetic heating system to work with a preset power (for example, 1500W) for a preset time (for example, 100ms), the third sampling circuit 30 collects the power supply voltage of the resonant heating circuit 3 within the preset time to obtain a power supply voltage sampling value, and then the control chip 40 determines the type of the power supply according to the power supply voltage sampling value.
Further, a user sets a target power of the electromagnetic heating system, the second sampling circuit 20 collects a power supply voltage of the power supply to obtain a power supply voltage sampling value, and the control chip 40 obtains a target working current of the resonant heating circuit through table lookup according to the type of the power supply, the power supply voltage sampling value and the target power of the electromagnetic heating system.
Further, the first sampling circuit 10 collects the working current of the resonant heating circuit 3 to obtain a working current sampling value, the control chip 40 determines whether the working current sampling value reaches the target working current, if so, the control chip 40 maintains the control signal currently output to the resonant heating circuit 3 unchanged, and if not, the control chip 40 adjusts the control signal output to the resonant heating circuit 3 to make the working current sampling value reach the target working current.
During the operation of the electromagnetic heating system, the control chip 40 further determines whether any one of the supply voltage of the resonant heating circuit 3, the supply voltage of the power supply, and the target power is changed. If any one of the three is changed, the control chip 40 looks up the table again to obtain the target working current of the resonant heating circuit 3; if none of the three is changed, the control chip 40 keeps the control signal currently output to the resonant heating circuit 3 unchanged.
In summary, according to the control circuit of the electromagnetic heating system in the embodiment of the present invention, the third sampling circuit is used to collect the power supply voltage of the resonant heating circuit, the control chip is used to obtain the type of the power supply according to the power supply voltage, the second sampling circuit is used to collect the power supply voltage of the power supply, the control chip is used to obtain the target working current of the resonant heating circuit according to the type of the power supply, the power supply voltage sampling value, and the target power of the electromagnetic heating system, and the first sampling circuit is used to collect the working current of the resonant heating circuit, and the control chip is used to control the power switching tube in the resonant heating circuit according to the working current sampling value and the target working current of the resonant heating circuit. Therefore, heating control of the electromagnetic heating system under different types of power supplies is achieved.
Further, the invention provides an electromagnetic heating system.
Fig. 7 is a block diagram of an electromagnetic heating system according to an embodiment of the present invention. As shown in fig. 7, the electromagnetic heating system 1000 includes the control circuit 100 of the electromagnetic heating system according to the above-described embodiment of the present invention.
According to the electromagnetic heating system provided by the embodiment of the invention, the control circuit of the electromagnetic heating system provided by the embodiment is adopted, so that heating work under different types of power supplies can be realized, and the compatibility of the electromagnetic heating system to the power supplies is good.
Fig. 8 is a flowchart of a control method of an electromagnetic heating system according to an embodiment of the present invention. As shown in fig. 8, the control method of the electromagnetic heating system includes the steps of:
s101, collecting the working current of the resonant heating circuit to obtain a working current sampling value.
S102, collecting the power supply voltage of the power supply to obtain a power supply voltage sampling value.
And S103, collecting the power supply voltage of the resonant heating circuit to obtain a power supply voltage sampling value.
And S104, acquiring the type of the power supply according to the power supply voltage sampling value, and acquiring the target working current of the resonant heating circuit according to the type of the power supply, the power supply voltage sampling value and the target power of the electromagnetic heating system.
And S105, generating a control signal according to the working current sampling value and the target working current of the resonant heating circuit so as to control a power switch tube in the resonant heating circuit.
In one embodiment of the invention, when controlling the electromagnetic heating system, the resonant voltage of the resonant heating circuit can be collected and judged; and when the resonance voltage is abnormal, controlling the electromagnetic heating system to stop working.
It can be understood that when the resonance voltage is not abnormal, the electromagnetic heating system can be controlled to work normally.
In the embodiment of the invention, in the working process of the electromagnetic heating system, whether any one of the power supply voltage of the resonant heating circuit, the power supply voltage of the power supply and the target power is changed or not is also judged, wherein if any one of the power supply voltage of the resonant heating circuit, the power supply voltage of the power supply and the target power is changed, the target working current of the resonant heating circuit is obtained again; and if the power supply voltage of the resonant heating circuit, the power supply voltage of the power supply and the target power are not changed, maintaining the control signal currently output to the resonant heating circuit unchanged.
It should be noted that, for the specific implementation of the control method of the electromagnetic heating system according to the embodiment of the present invention, reference may be made to the specific implementation of the control circuit of the electromagnetic heating system according to the above embodiment of the present invention, and in order to reduce redundancy, no further description is given here.
According to the control method of the electromagnetic heating system, the power supply voltage of the resonant heating circuit is collected, the type of the power supply is obtained according to the power supply voltage, the power supply voltage of the power supply is collected, the target working current of the resonant heating circuit is obtained according to the type of the power supply, the power supply voltage sampling value and the target power of the electromagnetic heating system, the working current of the resonant heating circuit is collected, and the power switch tube in the resonant heating circuit is controlled according to the working current sampling value and the target working current of the resonant heating circuit. Therefore, heating control of the electromagnetic heating system under different types of power supplies is achieved.
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 do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
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.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; 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 present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
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 (11)
1. A control circuit of an electromagnetic heating system, wherein the electromagnetic heating system comprises a rectifying circuit, a filter circuit and a resonant heating circuit, the control circuit comprising:
the first sampling circuit is used for collecting the working current of the resonance heating circuit to obtain a working current sampling value;
the second sampling circuit is used for collecting the power supply voltage of the power supply to obtain a power supply voltage sampling value;
the third sampling circuit is used for collecting the power supply voltage of the resonant heating circuit to obtain a power supply voltage sampling value;
the control chip is respectively connected with the output end of the first sampling circuit, the output end of the second sampling circuit and the output end of the third sampling circuit, and the control chip is used for acquiring the type of the power supply according to the power supply voltage sampling value, acquiring the target working current of the resonant heating circuit according to the type of the power supply, the power supply voltage sampling value and the target power of the electromagnetic heating system, and generating a control signal according to the working current sampling value and the target working current of the resonant heating circuit so as to control a power switch tube in the resonant heating circuit.
2. The control circuit of an electromagnetic heating system of claim 1, further comprising:
and the fourth sampling circuit is used for collecting the resonance voltage of the resonance heating circuit and sending the resonance voltage to the control chip so that the control chip controls the electromagnetic heating system to stop working when judging that the resonance voltage is abnormal.
3. The control circuit of an electromagnetic heating system of claim 1, wherein during operation of the electromagnetic heating system, the control chip is further configured to determine whether any one of a supply voltage of the resonant heating circuit, a supply voltage of the power supply, and the target power has changed, wherein,
if any one of the power supply voltage of the resonant heating circuit, the power supply voltage of the power supply and the target power is changed, the control chip reacquires the target working current of the resonant heating circuit;
and if the power supply voltage of the resonant heating circuit, the power supply voltage of the power supply and the target power are not changed, the control chip maintains the control signal currently output to the resonant heating circuit unchanged.
4. The control circuit of an electromagnetic heating system of claim 1, wherein the first sampling circuit comprises:
one end of the first resistor is connected with the negative input end of the rectifying circuit and then grounded, and the other end of the first resistor is respectively connected with the filter circuit and the resonant heating circuit;
one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is connected with a working current sampling end of the control chip;
and one end of the first filter capacitor is connected with the other end of the second resistor, and the other end of the first filter capacitor is grounded.
5. The control circuit of an electromagnetic heating system of claim 1, wherein the second sampling circuit comprises:
one end of the third resistor is connected with the positive output end of the power supply;
one end of the fourth resistor is connected with the negative output end of the power supply, the other end of the fourth resistor is connected with the other end of the third resistor to form a first node, and the first node is connected with the power supply voltage sampling end of the control chip;
one end of the fifth resistor is connected with the first node, and the other end of the fifth resistor is grounded;
and one end of the second filter capacitor is connected with the first node, and the other end of the second filter capacitor is grounded.
6. Control circuit of an electromagnetic heating system according to any of claims 1-5, characterized in that the types of power supply comprise an AC power supply, a DC power supply and a AC/DC power supply.
7. The control circuit of an electromagnetic heating system of claim 1, wherein the topology of the resonant heating circuit is one of a single tube resonant topology, a half-bridge resonant topology, an asymmetric half-bridge resonant topology, and a full-bridge resonant topology.
8. An electromagnetic heating system, characterized by comprising a control circuit of an electromagnetic heating system according to any of claims 1-7.
9. A method of controlling an electromagnetic heating system as set forth in claim 8, comprising the steps of:
collecting the working current of the resonant heating circuit to obtain a working current sampling value;
collecting the power supply voltage of a power supply to obtain a power supply voltage sampling value;
collecting the power supply voltage of the resonant heating circuit to obtain a power supply voltage sampling value;
acquiring the type of the power supply according to the power supply voltage sampling value, and acquiring a target working current of the resonant heating circuit according to the type of the power supply, the power supply voltage sampling value and the target power of the electromagnetic heating system; and
and generating a control signal according to the working current sampling value and the target working current of the resonant heating circuit so as to control a power switch tube in the resonant heating circuit.
10. The control method of an electromagnetic heating system according to claim 9, characterized by further comprising:
collecting the resonance voltage of the resonance heating circuit, and judging the resonance voltage;
and when the resonance voltage is abnormal, controlling the electromagnetic heating system to stop working.
11. The control method of an electromagnetic heating system according to claim 9 or 10, characterized in that, during operation of the electromagnetic heating system, it is further determined whether any one of a supply voltage of the resonance heating circuit, a supply voltage of the supply power source, and the target power has changed, wherein,
if any one of the power supply voltage of the resonant heating circuit, the power supply voltage of the power supply and the target power is changed, the target working current of the resonant heating circuit is obtained again;
and if the power supply voltage of the resonant heating circuit, the power supply voltage of the power supply and the target power are not changed, maintaining the control signal currently output to the resonant heating circuit unchanged.
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| CN112312592B (en) * | 2019-08-01 | 2023-01-24 | 佛山市顺德区美的电热电器制造有限公司 | Heating circuit, heating cup and vehicle-mounted heater |
| CN115278964A (en) * | 2021-04-30 | 2022-11-01 | 浙江苏泊尔家电制造有限公司 | Heating control method and device and electromagnetic heating cooking utensil |
| CN114390737B (en) * | 2021-12-17 | 2024-06-07 | 广东美的白色家电技术创新中心有限公司 | Power control circuit and power control method of electromagnetic heating device |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6255635B1 (en) * | 1998-07-10 | 2001-07-03 | Ameritherm, Inc. | System and method for providing RF power to a load |
| US6943330B2 (en) * | 2003-09-25 | 2005-09-13 | 3M Innovative Properties Company | Induction heating system with resonance detection |
| JP4978062B2 (en) * | 2006-06-02 | 2012-07-18 | パナソニック株式会社 | Power control apparatus for high frequency dielectric heating and control method thereof |
| CN101754510B (en) * | 2006-06-02 | 2013-02-13 | 松下电器产业株式会社 | Power control unit for high-frequency dielectric heating |
| US7626463B2 (en) * | 2006-08-25 | 2009-12-01 | Ameritherm, Inc. | Automatic frequency compensation for pulse width modulated RF level control |
| CN103024957A (en) * | 2012-12-31 | 2013-04-03 | 山东彼岸电力科技有限公司 | Medium-frequency induction heating power source and control method thereof |
| CN203457345U (en) * | 2013-07-11 | 2014-02-26 | 美的集团股份有限公司 | Electromagnetic heating device and control circuit thereof |
| CN204206516U (en) * | 2014-11-13 | 2015-03-11 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic Heating control circuit and electromagnetic heater |
| CN105992416B (en) * | 2015-02-02 | 2019-08-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating control circuit and electromagnetic heating apparatus |
| CN104869677B (en) * | 2015-05-25 | 2017-07-07 | 福建守正节能科技有限公司 | A kind of multifunction electromagnetic computer heating control chip |
| CN106851880B (en) * | 2015-12-03 | 2020-12-22 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating device and heating control method thereof |
| CN205232491U (en) * | 2015-12-22 | 2016-05-11 | 东莞市精诚电能设备有限公司 | Electromagnetism stove circuit |
| CN205793454U (en) * | 2016-07-04 | 2016-12-07 | 深圳市三利来智能厨业股份有限公司 | A kind of variable-frequency electromagnetic stove circuit |
| CN106793220B (en) * | 2016-12-20 | 2023-02-03 | 珠海格力电器股份有限公司 | Capacitor discharge method and circuit of electromagnetic heating device and electromagnetic oven |
-
2017
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