Electric range with single free zone burner and control method thereof

Abstract

The present application provides a kind of electric cooker with single free area burner, it includes: control unit, output includes the first output signal of first output level signal and first synchronization signal, and output includes the second output signal of second output level signal and second synchronization signal;First inverter, first output signal and second synchronization signal are received in sequence, and first high-frequency power is output to first working coil;And second inverter, first synchronization signal and second output signal are received in sequence, and second high-frequency power is output to second working coil, when first synchronization signal and second synchronization signal are all received, first inverter and second inverter simultaneously output first high-frequency power and second high-frequency power.

Description

Electric stove with a single free-zone burner and its control method Technical Field

[0001] The present invention relates to an electric stove having a single free-zone burner and a control method thereof, and more specifically, to an electric stove for preventing interference noise generated when a single free-zone burner comprising two or more working coils is operating, and a control method thereof. Background Technology

[0002] In homes and restaurants, various cooking appliances are used to heat food. In the past, gas stoves that used gas as fuel were widely used, but recently, electric stoves that do not use gas but use electricity to heat cooking containers such as pots are becoming more popular.

[0003] Electric stoves that use electricity to heat containers can be broadly categorized into resistance heating and induction heating. Resistance heating works by using heat generated when current flows through a non-metallic heating element (such as a metal resistance wire or silicon carbide) to heat the container. Induction heating, on the other hand, heats the container by applying a specified amount of high-frequency power to a working coil, which generates eddy currents in a container made of metal using an electromagnetic field around the coil.

[0004] The principle of induction heating will be explained in more detail below. First, when power is applied to the electric stove, a specified amount of high-frequency power is applied to the working coil. This generates an induced electromagnetic field around the working coil located inside the electric stove. When the magnetic lines of force of the induced electromagnetic field generated as described above pass through the bottom of a container containing metal components placed on top of the electric stove, eddy currents are generated inside the bottom of the container. As these eddy currents flow through the bottom of the container, they heat the container itself.

[0005] The electric stove includes: multiple burners, each with a working coil; multiple inverters that output high-frequency power to the working coils; and a control unit that outputs output level signals to the multiple inverters.

[0006] When the user of the electric stove sets the output level of multiple burners to place containers on multiple burners and cook simultaneously, the control unit outputs the output level signal to multiple inverters in sequence. The multiple inverters then output high-frequency power to multiple working coils according to the output level signal.

[0007] As described above, when the output level signal is sequentially output to each inverter, the output timing of the high-frequency power to each working coil is different. This results in a difference in the resonant frequency of each working coil in the initial output range before reaching the target output. When this difference in resonant frequency is contained within the audible frequency band, interference noise is generated due to the driving of each working coil. The interference noise generated in this manner causes discomfort to the user of the electric stove and becomes a reason for the user to suspect that the stove is malfunctioning.

[0008] Gnics' Korean Patent Publication No. 10-1735754, "High-Frequency Inverter Induction Coil Drive Circuit," discloses the following: In an induction heating device comprising multiple working coils, switching elements connected to each induction coil are sequentially turned on or off in a time-division manner, thereby blocking interference noise even when multiple working coils are driven simultaneously. However, if the heat output or operating frequency is arbitrarily adjusted, it becomes difficult to provide the output required when the user issues heating commands to each burner.

[0009] Another method to reduce interference noise in electric stoves with multiple working coils is to space the working coils as far apart as possible. That is, if the distance between the working coils is greater than a predetermined distance, interference noise is reduced regardless of the magnitude of the resonant frequency. However, the greater the distance between the working coils, the larger the size and volume of the electric stove becomes; therefore, there are limits to increasing the distance between the working coils to reduce interference noise. Summary of the Invention

[0010] Technical problems to be solved

[0011] In order to solve the problems of the prior art as described above, the object of the present invention is to use a synchronization signal to make the output time of the high-frequency power output by multiple inverters the same, thereby preventing interference noise caused by the difference in the resonant frequencies of multiple working coils.

[0012] Furthermore, the purpose of this invention is to output a synchronization signal to a different inverter when the output level signal is output to one of a plurality of inverters, so that the high-frequency power output by the plurality of inverters is at the same time.

[0013] Furthermore, the purpose of this invention is to ensure that even if one of the multiple inverters receives an output level signal, the output waits until a synchronization signal from a different inverter is received, thereby ensuring that the high-frequency power output by the inverters is at the same time.

[0014] The technical problems to be solved by the present invention are not limited to those mentioned above. Those skilled in the art to which the present invention pertains can clearly understand other technical problems not mentioned through the following description.

[0015] means for solving problems

[0016] To address the aforementioned problems, the present invention provides an electric stove with a single free-zone burner, which prevents interference noise generated when a single free-zone burner comprising two or more working coils is operating. The electric stove includes: a single free-zone burner comprising a first working coil and a second working coil; a control unit, which, when set to drive the first and second working coils at a set high-frequency power output level, outputs a first output signal including a first output level signal and a first synchronization signal corresponding to the output level, and outputs a second output signal including a second output level signal and a second synchronization signal corresponding to the output level; a power supply unit for outputting direct current (DC); a first inverter that sequentially receives the first output signal and the second synchronization signal, converts the DC power into a first high-frequency power according to the first output level signal, and outputs it to the first working coil; and a second inverter that sequentially receives the first synchronization signal and the second output signal, converts the DC power into a second high-frequency power according to the second output level signal, and outputs it to the second working coil. When both the first and second synchronization signals are received, the first inverter and the second inverter simultaneously output the first high-frequency power and the second high-frequency power.

[0017] Specifically, when the first output signal is output to the first inverter, the control unit outputs the first synchronization signal to the second inverter.

[0018] Furthermore, when the second output signal is output to the second inverter, the control unit outputs a second synchronization signal to the first inverter.

[0019] Furthermore, even if the first output signal is received, the first inverter keeps the output of the first high-frequency power waiting until the second synchronization signal is received.

[0020] Furthermore, when the second synchronization signal is input, the first inverter outputs the first high-frequency power, and when the second output signal is input, the second inverter outputs the aforementioned second high-frequency power.

[0021] Furthermore, the control unit sequentially outputs the first output signal and the second output signal.

[0022] Furthermore, the present invention provides a control method for an electric stove having a single free-zone burner. The electric stove is used to prevent interference noise generated when the single free-zone burner, including a first working coil and a second working coil, is operating. The control method includes the following steps: setting an output level for driving the first and second working coils with a set high-frequency power; outputting a first output signal to a first inverter including a first output level signal corresponding to the output level and a first synchronization signal, and outputting a first synchronization signal to a second inverter; outputting a second output signal to the second inverter including a second output level signal corresponding to the output level and a second synchronization signal, and outputting a second synchronization signal to the first inverter; when receiving the first output signal and the second synchronization signal, the first inverter converts DC power into a first high-frequency power according to the first output level signal and outputs it to the first working coil; and when receiving the first synchronization signal and the second output signal, the second inverter converts DC power into a second high-frequency power according to the second output level signal and outputs it to the second working coil.

[0023] The steps for setting the output level are as follows: when one of the output levels for driving the first working coil and the output level for driving the second working coil is set, the other is also set.

[0024] Invention Effects

[0025] According to the present invention, a synchronization signal is used to make the output time of the high-frequency power output by multiple inverters the same, thereby preventing interference noise caused by the difference in the resonant frequencies of multiple working coils.

[0026] Furthermore, according to the present invention, when the output level signal is output to one of the multiple inverters, a synchronization signal is output to a different inverter, so that the output time of the high-frequency power output by the multiple inverters is the same.

[0027] Furthermore, according to the present invention, even if one of the multiple inverters receives an output level signal, the output waits until a synchronization signal from a different inverter is received, thereby ensuring that the high-frequency power output by the inverters is at the same time.

[0028] The effects that can be obtained by the present invention are not limited to those mentioned above. Those skilled in the art to which this invention pertains can clearly understand other effects not mentioned from the following description. Attached Figure Description

[0029] Figure 1 is a perspective view of an electric stove with a single free zone burner according to an embodiment of the present invention.

[0030] Figure 2 is a diagram illustrating an example of the use of a single free zone burner according to an embodiment of the present invention.

[0031] Figure 3 is a block diagram of the control device for an electric stove with a single free zone burner according to an embodiment of the present invention.

[0032] Figure 4 is a circuit diagram of the control device for an electric stove with a single free zone burner according to an embodiment of the present invention.

[0033] Figures 5 to 8 illustrate, illustratively, a table of output signals in an electric stove with a single free zone burner according to an embodiment of the present invention.

[0034] Figure 9 is a graph simulating the difference in resonant frequencies between the two working coils in a conventional electric stove.

[0035] Figure 10 is a graph showing the difference in resonant frequencies of the initial output range of the two working coils in the electric stove simulating an embodiment of the present invention. Detailed Implementation

[0036] To fully understand the structure and effects of the present invention, preferred embodiments of the invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below; it can be implemented in various ways and can be modified in various ways. The description of these embodiments is provided only to make the disclosure of the invention more complete and to fully inform those skilled in the art of the scope of the invention. In the drawings, for ease of explanation, components are shown enlarged compared to their actual size, and the proportions of each component may be exaggerated or reduced.

[0037] The terms "first," "second," etc., are used to describe various components, but the components described herein should not be limited to these terms. These terms are used only to distinguish one component from another. For example, without departing from the scope of this invention, "first component" may be named "second component," and similarly, "second component" may be named "first component." Furthermore, unless the context clearly indicates otherwise, singular expressions include plural expressions. Unless otherwise defined, the terms used in the embodiments of this invention are to be interpreted as having meanings commonly known to those skilled in the art.

[0038] Figure 1 is a perspective view of an electric stove with a single free zone burner according to an embodiment of the present invention.

[0039] Referring to FIG1, the electric stove 100 of this embodiment may include a housing 101, a cover 102, a placement plate 103, a first working coil 111, a second working coil 112, a third working coil 121, and an interface 131.

[0040] The electric stove 100 may have a free zone burner 110 and a single burner 120. The free zone burner 110 includes two or more working coils, and the single burner 120 includes one working coil.

[0041] The following description will be based on the case where the free zone burner 110 includes a first working coil 111 and a second working coil 112 and a single burner 120 includes a third working coil 121. The single burner 120 has the same structure as the conventional electric stove 100, so detailed descriptions related to this will be omitted.

[0042] The housing 101 internally houses the first working coil 111, the second working coil 112, the third working coil 121, and the interface 131. The cover 102 is combined with the housing 101 to cover the upper part of the housing 101.

[0043] A placement plate 103 is disposed on the upper part of the cover 102 and is used to place a container for cooking heated objects, i.e., food. The placement plate 103 may be made of a transparent, heat-resistant material, such as a reinforced glass material of ceramic glass.

[0044] Preferably, in order to uniformly transfer heat to the entire free zone burner 110, the first working coil 111 and the second working coil 112 are formed as quadrilaterals with curved corners. This is because if the first working coil 111 and the second working coil 112 are formed as circles, relatively less heat will be transferred to the area where the first working coil 111 and the second working coil 112 face each other.

[0045] The third working coil 121 can be formed into a circular shape, which is a conventional container shape, but is not limited to this. It can be formed into various shapes as needed.

[0046] The first working coil 111 and the second working coil 112 are arranged side by side along one direction, and the third working coil 121 can be arranged on one side of the first working coil 111 or the second working coil 112.

[0047] The cover 102 may display a free zone burner region 113 and a single burner region 122 on its upper surface. The free zone burner region 113 may be displayed in a shape that surrounds the first working coil 111 and the second working coil 112 at a position corresponding to the first working coil 111 and the second working coil 112. To distinguish the first working coil 111 and the second working coil 112, a boundary line may be displayed between the first working coil 111 and the second working coil 112.

[0048] Furthermore, a single burner region can be displayed in a shape that surrounds the third working coil 121 at a position corresponding to the third working coil 121.

[0049] For example, the free zone burner region 113 is displayed as a quadrilateral with curved corners so as to include the first working coil 111 and the second working coil 112 inside, and the third working coil 121 can be displayed as a circle so as to include the third working coil 121 inside.

[0050] In contrast, the free zone burner region 113 and the individual burner region 122 may also be formed on the lower or upper surface of the placement plate 103.

[0051] Therefore, the free zone burner area 113 and the individual burner area 122 can be visually confirmed from the outside. When the user places the container on the placement plate 103, the container can be placed more accurately at the positions of the first working coil 111, the second working coil 112 and the third working coil 121.

[0052] Interface 131 can be configured on one side of the first working coil 111 or the second working coil 112, and displays various information related to the electric stove 100. Interface 131 is used when a user applies power to the electric stove 100 or adjusts the output levels of the first working coil 111, the second working coil 112, and the third working coil 121. Interface 131 can be implemented using a touchpad that allows for touch input and information display.

[0053] The cover 102 may display an operation area 132 on its upper surface at a position corresponding to the interface 131, with a shape corresponding to the interface 131. This operation area 132 may display specific text or images for displaying user operations or information, and may display various information output by the interface 131 according to the user's operation or the operation of the electric stove 100.

[0054] Thus, the user can touch a specific location on the operation area 132 by referring to the text or images displayed in the operation area 132, thereby performing the operation of the electric stove 100 and confirming various information output by the interface 131.

[0055] Figure 2 is a diagram illustrating an example of the use of the free zone burner according to an embodiment of the present invention.

[0056] Referring to Figure 2, the free zone burner region 113 can be divided into a first heating region 113a in which a first working coil 111 is provided at the lower part of the placement plate 103, and a second heating region 113b in which a second working coil 112 is provided at the lower part of the placement plate 103.

[0057] As shown in part (a) of Figure 2, the user can place the first container 1, which is the same size as the first heating area 113a, into the first heating area 113a and make the first working coil 111 work. The user can also place the second container 2, which is the same size as the second heating area 113b, into the second heating area 113b and make the second working coil 112 work.

[0058] Furthermore, as shown in part (b) of Figure 2, the user can place the first heating zone 113a and the second heating zone 113b, that is, the third container 3, which is the size corresponding to the entire free zone burner zone 113, in the first heating zone 113a and the second heating zone 113b, and the first working coil 111 and the second working coil 112 can work respectively.

[0059] As described above, the electric stove 100 of this embodiment of the invention can place a single free zone burner 110 on multiple containers and cook them simultaneously. It can heat containers of various sizes using a single free zone burner 110, thereby providing convenience to the user.

[0060] Figure 3 is a block diagram of the control device for an electric stove with a single free zone burner according to an embodiment of the present invention, and Figure 4 is a circuit diagram of the control device for an electric stove with a single free zone burner according to an embodiment of the present invention.

[0061] Referring to Figures 3 and 4, the control device 101 of the electric stove 100 having a single free zone burner may include a power supply unit 140, a control unit 150, a first inverter 161, and a second inverter 162. The various components of this control device 101 can be housed within the casing 101.

[0062] The power supply unit 140 receives AC power from the common power supply 10 and converts it into DC power, and outputs it to the first inverter 161 and the second inverter 161.

[0063] The first inverter 161 includes a first switch SW1 and a second switch SW2 connected in series. By turning the first switch SW1 and the second switch SW2 on or off, DC power is converted into a first high-frequency power. The second inverter 162 includes a third switch SW3 and a fourth switch SW4 connected in series. By turning the third switch SW3 and the fourth switch SW4 on or off, DC power is converted into a second high-frequency power.

[0064] The first working coil 111 is connected to the connection node of the first switch SW1 and the second switch SW2 included in the first inverter 161 to receive the first high-frequency power, and the second working coil 112 is connected to the connection node of the third switch SW3 and the fourth switch SW4 included in the second inverter 162 to receive the second high-frequency power.

[0065] When the output level for driving the first working coil 111 and the second working coil 112 is set to a set high-frequency power, the control unit 150 outputs a first output signal including a first output level signal and a first synchronization signal corresponding to the set output level, and outputs a second output signal including a second output level signal and a second synchronization signal corresponding to the set output level. The control unit 150 outputs the first output signal and the second output signal sequentially.

[0066] The first output level signal is a signal used to control the output level of the first inverter 161, which is a signal to adjust the duty cycle of the first switch SW1 and the second switch SW2. The second output level signal is a signal used to control the output level of the second inverter 162, which is a signal to adjust the duty cycle of the third switch SW3 and the fourth switch SW4.

[0067] The first synchronization signal and the second synchronization signal are used to synchronize the timing of the first inverter 161 outputting the first high-frequency power and the timing of the second inverter 162 outputting the second high-frequency power.

[0068] When the first output signal is output to the first inverter 161, the control unit 150 outputs a first synchronization signal to the second inverter 162, and when the second output signal is output to the second inverter 162, it outputs a second synchronization signal to the first inverter 161.

[0069] The first inverter 161 receives a first output signal and a second synchronization signal sequentially from the control unit 150. Specifically, the first inverter 161 first receives a first output level signal and a first synchronization signal simultaneously from the control unit 150, and then, when the control unit 150 outputs a second output signal to the second inverter 162, it receives the second synchronization signal separated from the second output signal.

[0070] In addition, even if the first output signal is received, the first inverter 161 keeps the output of the first high-frequency power waiting until the second synchronization signal is received. Then, when the second synchronization signal is input, the first high-frequency power is output.

[0071] The second inverter 162 receives a first synchronization signal and a second output signal sequentially from the control unit 150. Specifically, firstly, when the control unit 150 outputs a first output signal to the first inverter 161, the second inverter 162 receives the first synchronization signal separated from the first output signal. Then, it simultaneously receives a second output level signal and a second synchronization signal from the control unit 150.

[0072] The second inverter 162 has received the first synchronization signal before receiving the second output signal, so when the second output signal is input, it directly outputs the second high-frequency power.

[0073] When a second synchronization signal is input, the first inverter 161 converts DC power into first high-frequency power according to the first output level signal received from the control unit 150 and outputs it to the first working coil 111. At the same time, when a second output signal is input, the second inverter 162 converts DC power into second high-frequency power according to the second output level signal received from the control unit 150 and outputs it to the second working coil 112.

[0074] That is, when both the first synchronization signal and the second synchronization signal are received, the first inverter 161 and the second inverter 162 simultaneously output the first high-frequency power and the second high-frequency power.

[0075] Figures 5 to 8 illustrate tables of output signals in an electric stove with a single free-zone burner according to an embodiment of the present invention. Specifically, Figures 5 and 8 show tables of output signals output to the first inverter 161, and Figures 6 and 7 show tables of output signals output to the second inverter 162.

[0076] Hereinafter, with reference to Figures 5 to 8, the control method of the electric stove with a free zone burner according to an embodiment of the present invention will be described.

[0077] The output signals include output level signals and synchronization signals. The output level signals include a first output level signal and a second output level signal, which consist of multiple stages (e.g., 8 stages), and the synchronization signals include a first synchronization signal and a second synchronization signal.

[0078] In this diagram, the dashed boxes represent the first output level signal and the first synchronization signal, and the solid boxes represent the second output level signal and the second synchronization signal. Furthermore, the output level consists of a total of eight stages, but may have fewer or more than this.

[0079] First, the user places container 2 on the free-zone burner 110 and selects the operation of the free-zone burner 110 via interface 131, setting the high-frequency power to simultaneously drive the output levels of the first working coil 111 and the second working coil 112 (e.g., stage 7). At this time, the output levels of the first working coil 111 and the second working coil 112 are the same. The user can simultaneously set the output levels of the first working coil 111 and the second working coil 112 with a single operation via interface 131. That is, when the user sets one of the output levels for driving the first working coil 111 or the second working coil 112, the other level is simultaneously set.

[0080] Subsequently, as shown in Figure 5, the control unit 150 outputs a 7-stage first output level signal and a first synchronization signal S1 corresponding to the set output level to the first inverter 161. At the same time, as shown in Figure 6, the first synchronization signal S1 is output to the second inverter 162. At this time, although the first inverter 161 has received the 7-stage first output level signal, it has not yet received the second synchronization signal S2, thus causing the output of the first high-frequency power to wait.

[0081] Next, as shown in FIG7, the control unit 150 outputs a 7-stage second output level signal and a second synchronization signal S2 corresponding to the set output level to the second inverter 162. At the same time, as shown in FIG8, the second synchronization signal S2 is output to the first inverter 161. At this time, the first inverter 161 is in the state of receiving the 7-stage first output level signal, the first synchronization signal S1 and the second synchronization signal S2, and the second inverter 162 is in the state of receiving the 7-stage second output level signal, the first synchronization signal S1 and the second synchronization signal S2.

[0082] Therefore, at the time point when the first inverter 161 receives the second synchronization signal S2, it converts the DC power into the first high-frequency power according to the first output level signal of the 7th stage and outputs it to the first working coil 111. At the time point when the second inverter 162 receives the second synchronization signal S2, it converts the DC power into the second high-frequency power according to the second output level signal of the 7th stage and outputs it to the second working coil 112.

[0083] That is, when both the first synchronization signal S1 and the second synchronization signal S2 are received, the first inverter 161 and the second inverter 162 simultaneously output the first high-frequency power and the second high-frequency power.

[0084] Figure 9 is a graph showing the difference in resonant frequencies between two working coils in a conventional electric stove, and Figure 10 is a graph showing the difference in resonant frequencies between the initial output ranges of two working coils in an electric stove according to an embodiment of the present invention.

[0085] In Figures 9 and 10, the horizontal axis represents time (seconds) and the vertical axis represents the frequency difference (kHz).

[0086] First, referring to Figure 9, it can be confirmed that in existing electric stoves, as the output level signal is sequentially output to two inverters, the output time of the high-frequency power output to each working coil also becomes different, and the resonant frequency difference of each working coil generated in the initial output range (0 seconds to 30 seconds) is relatively large.

[0087] Next, referring to FIG10, it can be confirmed that the electric stove of the present invention makes the output time of the high-frequency power output by the two inverters to each working coil the same, and the difference in the resonant frequency of the working coil in the initial output range (0 seconds to 30 seconds) is greatly reduced compared with the existing electric stove.

[0088] As described above, the electric stove with a free-zone burner in this embodiment of the invention uses a synchronization signal to make the output time of the high-frequency power output by multiple inverters the same, thereby preventing interference noise caused by the difference in the resonant frequencies of multiple working coils.

[0089] Specific embodiments have been described in the detailed description of this invention, but various modifications can be made without departing from the scope of this invention. Therefore, the scope of this invention is not limited to the described embodiments, but should include the scope of protection claimed and the definitions of technical solutions equivalent to the scope of protection claimed.

[0090] Industrial availability

[0091] The electric stove with a single free zone burner and its control method of the present invention can be implemented in various household appliances used in homes or industrial sites and in controllers used to control them, and therefore has industrial applicability.

Claims

1. An electric stove with a single free-zone burner, used to prevent interference noise generated when a single free-zone burner comprising two or more working coils is operating, wherein the electric stove with a single free-zone burner is characterized in that, include: A single free-zone burner, comprising a first working coil and a second working coil; The control unit, when set to drive the first working coil and the second working coil with a set high-frequency power, outputs a first output signal including a first output level signal and a first synchronization signal corresponding to the output level, and outputs a second output signal including a second output level signal and a second synchronization signal corresponding to the output level; the power supply unit is used to output DC power; the first inverter sequentially receives the first output signal and the second synchronization signal, converts the DC power into a first high-frequency power according to the first output level signal, and outputs it to the first working coil; and the second inverter sequentially receives the first synchronization signal and the second output signal, converts the DC power into a second high-frequency power according to the second output level signal, and outputs it to the second working coil. When both the first synchronization signal and the second synchronization signal are received, the first inverter and the second inverter simultaneously output the first high-frequency power and the second high-frequency power.

2. The electric stove with a single free-zone burner according to claim 1, characterized in that, When the first output signal is output to the first inverter, the control unit outputs the first synchronization signal to the second inverter.

3. The electric stove with a single free-zone burner according to claim 1, characterized in that, When the second output signal is output to the second inverter, the control unit outputs the second synchronization signal to the first inverter.

4. The electric stove with a single free-zone burner according to claim 1, characterized in that, Even if the first output signal is received, the first inverter will wait until the second synchronization signal is received before the output of the first high-frequency power is available.

5. The electric stove with a single free-zone burner according to claim 1, characterized in that, When the second synchronization signal is input, the first inverter outputs the first high-frequency power.

6. The electric stove with a single free-zone burner according to claim 1, characterized in that, When the second output signal is input, the second inverter outputs the second high-frequency power.

7. The electric stove with a single free-zone burner according to claim 1, characterized in that, The control unit outputs the first output signal and the second output signal in sequence.

8. A control method for an electric stove having a single free-zone burner, the electric stove being used to prevent interference noise generated when the single free-zone burner, including a first working coil and a second working coil, is operating; the control method for the electric stove having a single free-zone burner is characterized in that... The method includes the following steps: setting an output level for driving the first and second working coils with a set high-frequency power; outputting a first output signal to a first inverter including a first output level signal corresponding to the output level and a first synchronization signal, and outputting the first synchronization signal to a second inverter; outputting a second output signal to the second inverter including a second output level signal corresponding to the output level and a second synchronization signal, and outputting the second synchronization signal to the first inverter; when receiving the first output signal and the second synchronization signal, the first inverter converts DC power into a first high-frequency power according to the first output level signal and outputs it to the first working coil; and when receiving the first synchronization signal and the second output signal, the second inverter converts DC power into a second high-frequency power according to the second output level signal and outputs it to the second working coil.

9. The control method for an electric stove with a single free-zone burner according to claim 8, characterized in that, When one of the output levels used to drive the first working coil and the output levels used to drive the second working coil is set, the other is also set.

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