CN106136845A - Cooking apparatus and the electric heater unit for cooking apparatus - Google Patents
Cooking apparatus and the electric heater unit for cooking apparatus Download PDFInfo
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- CN106136845A CN106136845A CN201510162123.XA CN201510162123A CN106136845A CN 106136845 A CN106136845 A CN 106136845A CN 201510162123 A CN201510162123 A CN 201510162123A CN 106136845 A CN106136845 A CN 106136845A
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Abstract
The invention discloses the electric heater unit of a kind of cooking apparatus and cooking apparatus, this device includes: switching tube, the first end ground connection of switching tube；Resonance coil, the first end of resonance coil is connected with power supply, and the second end of resonance coil is connected with the second end of switching tube；First electric capacity, the first end of the first electric capacity is connected with the second end of resonance coil, the second end ground connection of the first electric capacity；At least one electric capacity being connected between the first electric capacity and ground adjusts circuit, and electric capacity adjusts circuit and includes the second electric capacity and the switch module in parallel with the second electric capacity；Controller, controller adjusts being opened or closed of switch module in circuit for controlling switching tube and at least one electric capacity, thus can ensure that electric heater unit all can realize laser heating high-power under low-power, guarantee to cook effect, promote the experience of user, and ensure that switch tube voltage zero-crossing is open-minded, it is to avoid switching tube damages, and avoid switching tube heating serious, and then without strengthening the heat radiation of switching tube.
Description
Technical field
The present invention relates to living electric apparatus technical field, particularly relate to a kind of cooking apparatus and the electric heater unit for cooking apparatus.
Background technology
Typically requiring very big power output by way of electromagnetic induction cooking food, such as power output can reach 2000W, in order to reduce the loss of switching tube, is necessary for allowing switch pipe work in Sofe Switch state.In the related, LC resonance circuit is mostly used to carry out resonance heating.Resonance circuit has selecting frequency characteristic, and only when the operating frequency of switching tube and the resonant frequency of resonance circuit are consistent, the operation power of heater is maximum, and duty is optimal；The operating frequency off-resonance frequency of switching tube is bigger, and the operation power of heater is less, and duty is poorer, and such as switching tube will be gradually backed out Sofe Switch state, enter hard switching state, thus be easily damaged switching tube, and causes the temperature rise of switching tube too high.
But, in the related, the resonant parameter of resonance circuit is usually the fixed value arranging on the premise of realizing high-power operation, it has the drawback that, heater for example can only realize laser heating in the range of predetermined power in 1000W-2000W, if heater is with low power run, then in order to avoid damaging switching tube, can only realize that low-power heats with the intermittent heating, for example realize that 500W heats, then heat, with 1000W, the cycle stopping again heating 5 seconds for 5 seconds to heat, but the culinary art effect difference of the intermittent heating, user's request cannot be met.
Therefore, there are improved needs in correlation technique.
Content of the invention
It is contemplated that one of technical problem solving at least to a certain extent in correlation technique.To this end, it is an object of the present invention to propose the electric heater unit of a kind of cooking apparatus, the electric heater unit of this cooking apparatus all can realize laser heating high-power under low-power, and avoids switching tube to damage.
Further object is that a kind of cooking apparatus of proposition.
To achieve these goals, the electric heater unit of a kind of cooking apparatus that one aspect of the present invention embodiment proposes, comprising: switching tube, the first end ground connection of described switching tube；Resonance coil, the first end of described resonance coil is connected with power supply, and the second end of described resonance coil is connected with the second end of described switching tube；First electric capacity, the first end of described first electric capacity is connected with the second end of described resonance coil, the second end ground connection of described first electric capacity；At least one electric capacity being connected between described first electric capacity and described ground adjusts circuit, and described electric capacity adjusts circuit and includes the second electric capacity and the switch module in parallel with described second electric capacity；Controller, described controller adjusts being opened or closed of switch module in circuit for controlling described switching tube and at least one electric capacity described.
The electric heater unit for cooking apparatus proposing according to embodiments of the present invention, first end of resonance coil is connected with power supply, second end of resonance coil is connected with the second end of switching tube, first end of the first electric capacity is connected with the second end of resonance coil, second end ground connection of the first electric capacity, the electric capacity that second electric capacity and switch module are constituted adjusts and is electrically connected between the first electric capacity and ground, being opened or closed of controller control switching tube and switch module.Thus, the resonant capacitance value of resonance circuit can be changed by the break-make controlling switch module, thus can ensure that electric heater unit all can realize laser heating high-power under low-power, guarantee to cook effect, promote the experience of user, and ensure that switch tube voltage zero-crossing is open-minded, it is to avoid switching tube damages, and avoid switching tube heating serious, and then without strengthening the heat radiation of switching tube.
Specifically, described switch module is relay, switching tube, metal-oxide-semiconductor or thyristor.Described switching tube can be managed for IGBT.
Further, when described electric capacity adjustment circuit is one, described second electric capacity is connected between described first electric capacity and described ground, first end of described second electric capacity is connected with the second end of described first electric capacity, second end ground connection of described second electric capacity, wherein, has first node between described first electric capacity and the second electric capacity, first end of described switch module is connected with described first node, the second end ground connection of described switch module.
Specifically, when the operation power of described electric heater unit is more than the first predetermined power, described controller control described switch module Guan Bi；When the operation power of described electric heater unit is less than or equal to described first predetermined power, the described switch module of described controller control disconnects.
Further, when described electric capacity adjustment circuit is multiple, multiple electric capacity adjust circuit and can be connected in series with each other.
To achieve these goals, a kind of cooking apparatus that another aspect of the present invention embodiment proposes, including described electric heater unit.
The cooking apparatus proposing according to embodiments of the present invention, can be changed the resonant capacitance value of resonance circuit, thus can ensure that cooking apparatus all can realize laser heating high-power under low-power, it is ensured that culinary art effect, promote the experience of user by electric heater unit.
Brief description
Fig. 1 is the frame principle figure of the electric heater unit for cooking apparatus according to embodiments of the present invention, and wherein switch module disconnects；
Fig. 2 is the circuit theory diagrams of the electric heater unit for cooking apparatus according to an embodiment of the invention, and wherein switch module is relay；
Fig. 3 is the circuit theory diagrams of the electric heater unit for cooking apparatus according to an embodiment of the invention, and wherein switch module is metal-oxide-semiconductor；And
Fig. 4 is the block diagram of cooking apparatus according to embodiments of the present invention.
Reference:
Electric heater unit the 100th, switching tube Q1, resonance coil L1, the first electric capacity C1, at least one electric capacity adjust circuit the 10th, controller the 20th, the second electric capacity C2, switch module S1, power supply 30 and cooking apparatus 200.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of same or like function from start to finish.The embodiment describing below with reference to accompanying drawing is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings describing cooking apparatus and the electric heater unit for cooking apparatus of the air-conditioner of the embodiment of the present invention, electric heater unit 100 is for carrying out heating to cook to pan.
As shown in Figure 1-Figure 3, the electric heater unit 100 for cooking apparatus according to embodiments of the present invention includes: switching tube Q1, resonance coil L1, the first electric capacity C1, at least one electric capacity adjust circuit 10 and controller 20.
Wherein, the first end ground connection of switching tube Q1；First end of resonance coil L1 is connected with power supply 30, and second end of resonance coil L1 is connected with second end of switching tube Q1；First end of the first electric capacity C1 is connected with second end of resonance coil L1, the second end ground connection of the first electric capacity C1；At least one electric capacity adjusts circuit 10 and is connected between the first electric capacity C1 and ground, and electric capacity adjusts circuit 10 and includes the second electric capacity C2 and the switch module S1 in parallel with the second electric capacity C2；Controller 20 is for controlling being opened or closed of switching tube Q1 and the switch module S1 at least one electric capacity adjustment circuit 10.Further, electric heater unit 100 may also include driver, and driver can be connected with control end and the controller 20 of switching tube Q1 respectively.
That is, the exportable PWM of controller 20 (Pulse Width Modulation, pulse width modulation) control signal to driver with being opened or closed by driver control switching tube Q1, also exportable at least one way switch of controller 20 controls signal at least one electric capacity corresponding and adjusts circuit 10, is controlled with the switch module S1 adjusting at least one electric capacity in circuit 10 respectively.
Wherein it is desired to explanation, when controller 20 controls switching tube Q1 Guan Bi, resonance coil L1 is charged；When controller 20 controls switching tube Q1 disconnection, the electric capacity of resonance coil L1 and participation resonance vibrates, and wherein, the electric capacity participating in resonance has the conducting state decision of control assembly.Thus producing alternating magnetic field around resonance coil L1, the magnetic line of force major part of alternating magnetic field passes through pan, and produces a large amount of eddy current in the bottom of a pan of pan, thus produces the required heat of culinary art, it is achieved resonance heats.
And, it is understood that be controlled by adjusting being opened or closed of circuit 10 breaker in middle assembly S1 at least one electric capacity, adjustable and resonance coil L1 carry out the capacitance of the resonant capacitance of resonance.Specifically, when controller 20 controls switch module S1 disconnection, the second electric capacity C2 in parallel with switch module S1 will constitute resonant capacitance together with the first electric capacity C1, thus have adjusted the capacitance of resonant capacitance；When controller 20 controls switch module S1 Guan Bi, the second electric capacity C2 in parallel with switch module S1 is shorted and is not involved in resonance.
As mentioned above, after electric heater unit 100 powers on, controller 20 can obtain the running frequency of electricity cooking pot in real time, and work with corresponding operating frequency according to running power control switching pipe Q1, control being opened or closed of the switch module S1 at least one electric capacity adjustment circuit 10 always according to operation power simultaneously, to select suitable capacitance, and then make the resonant frequency of resonance circuit in electric heater unit 100 consistent with the operating frequency of switching tube Q1, thus electric heater unit can realize laser heating high-power under low-power, for example can realize running power laser heating in the range of 200W to 2000W.
Thus, the resonant capacitance value of resonance circuit can be changed by the break-make controlling switch module, thus can ensure that electric heater unit all can realize laser heating high-power under low-power, guarantee to cook effect, promote the experience of user, and ensure that switch tube voltage zero-crossing is open-minded, it is to avoid switching tube damages, and avoid switching tube heating serious, and then without strengthening the heat radiation of switching tube.
A specific example according to the present invention, controller 20 can be MCU (Micro Control Unit, microcontroller).
In addition, according to the example of Fig. 1-Fig. 3, switching tube Q1 can manage (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) for IGBT.First end of switching tube Q1 is the emitter stage of IGBT pipe, and second end of switching tube Q1 is the colelctor electrode of IGBT pipe, and the control end of switching tube Q1 is the grid of IGBT pipe.
According to the example of Fig. 1-Fig. 3, power supply 30 can include rectification unit 301 and filter unit 302, and wherein, rectification unit 301 can be the rectifier bridge that 4 diodes are constituted, and rectification unit 301 is for being direct current by alternating current such as 220V commercial power rectification；Filter unit 302 can include rate filter capacitor C3 and filter inductance L2, and filter unit 302 is used for being filtered the direct current after rectification, and filtered direct current is supplied to resonance coil L1.Power supply 30 also includes, the 3rd electric capacity C4, and the 3rd electric capacity C4 is connected in parallel on the input of power supply 30.
According to some embodiments of the present invention, switch module S1 can be relay, switching tube, MOS (Metal-Oxide-Semiconductor, metal-oxide layer-semiconductor) pipe or thyristor.
Specifically, as shown in Figure 2, when switch module S1 can be relay, first end of the first end of the switch of relay and the second electric capacity C2 is connected, second end of the second end of the switch of relay and the second electric capacity C2 is connected, and the first end of the coil of relay is connected with default power supply (such as+5V power supply), and the second end of the coil of relay is connected with the colelctor electrode of triode Q2, the grounded emitter of triode Q2, the control end of triode Q2 is connected with controller 20.Thus, controller 20 can control the Guan Bi of switch and the cut out of relay by outputing control signals to the control end of triode Q2.
Specifically, as shown in Figure 3, when switch module S1 can be metal-oxide-semiconductor, the drain electrode of metal-oxide-semiconductor is connected with first end of the second electric capacity C2, second end of the source electrode of metal-oxide-semiconductor and the second electric capacity C2 is connected, the grid of metal-oxide-semiconductor is connected with controller 20, and thus, controller 20 can control Guan Bi and the cut out of metal-oxide-semiconductor by outputing control signals to the grid of metal-oxide-semiconductor.
Adjust circuit below in conjunction with the electric capacity to the embodiment of the present invention for Fig. 2 and Fig. 3 to be described in detail.
As shown in Figures 2 and 3, when electric capacity adjustment circuit 10 is one, second electric capacity C2 is connected between the first electric capacity C1 and ground, second end of first end of the second electric capacity C2 and the first electric capacity C1 is connected, the second end ground connection of the second electric capacity C2, wherein, has first node between the first electric capacity C1 and the second electric capacity C2, first end of switch module S1 is connected with first node, the second end ground connection of switch module S2.
Further, when the operation power of electric heater unit is more than the first predetermined power, controller 20 controls switch module S1 Guan Bi；When the operation power of electric heater unit is less than or equal to the first predetermined power, controller 20 controls switch module S1 and disconnects.
Specifically, example such as Fig. 2, when the operation power of electric heater unit is more than the first predetermined power, controller 20 controls the switch Guan Bi of relay, second electric capacity C2 is shorted and is not involved in resonance, now resonance coil L1 and the first electric capacity C1 constitutes series resonant circuit, and the equivalent tank electric capacity of resonance circuit is the first electric capacity C1, and the resonant frequency of resonance circuit is only determined by the inductance value of resonance coil L1 and the capacitance of the first electric capacity C1.Specifically, resonant frequencyWherein, L1For the inductance value of resonance coil L1, C1It is the capacitance of the first electric capacity C1.Preferably, f0 can be 20kHz.Assume when electric heater unit works with a higher operation power such as 2000W, controller 20 export to the pwm control signal of IGBT pipe be 20kHz, so by controlling the switch Guan Bi of relay, IGBT pipe will work with optimum state, the colelctor electrode of IGBT pipe just turns on when voltage zero-cross, for Sofe Switch state, switching loss is minimum.
Afterwards, when the high level pulsewidth of pwm control signal gradually decreases, the ON time of IGBT pipe reduces, the cycle time of pwm control signal reduces under the effect of synchronous circuit therewith, thus the frequency of pwm control signal raises, the operating frequency of IGBT pipe is gradually distance from resonant frequency f0, and the energy that resonance coil L1 stores reduces, the operation power of electricity cooking pot is gradually lowered, enough energy are not had to make the voltage of the first electric capacity C1 be down to 0V during the conducting of IGBT pipe, IGBT pipe progresses into hard switching state, and switching loss increases.In other words, in order to reduce operation power, it will reduce the high level pulsewidth of PMW control signal, the cycle time of pwm control signal can be reduced so simultaneously, the frequency of pwm control signal is improved.
When the operation power of electric heater unit is less than or equal to the first predetermined power, the pwm control signal output of second frequency is managed by controller 20 to IGBT, controller 20 controls switching off of relay simultaneously, second electric capacity C2 participates in resonance, now resonance coil L1, the first electric capacity C1 constitute series resonant circuit together with the second electric capacity, the equivalent tank electric capacity of resonance circuit is the first electric capacity C1 and the second electric capacity C2 series connection, and the resonant frequency of resonance circuit is determined by the inductance value of resonance coil L1 and the capacitance of the first electric capacity C1 and the second electric capacity.Specifically, resonant frequencyWherein, L1For the inductance value of resonance coil L1, C1It is the capacitance of the first electric capacity C1, C2It is the capacitance of the second electric capacity C2.Owing to the first electric capacity C1 and the second electric capacity C2 connects, the capacitance of resonant capacitance reduces, and resonant frequency increases.Preferably, f1 can be 35kHz.Assume when electric heater unit is with a low operation power such as 900W job, controller 20 export to the pwm control signal of IGBT pipe be 35kHz, so switching off by control relay, resonant frequency is consistent with the operating frequency of IGBT pipe again, IGBT pipe will work with optimum state again, and the colelctor electrode of IGBT pipe just turns on when voltage zero-cross, be Sofe Switch state, switching loss is minimum, thus realizes low-power laser heating.
Thus, the resonant capacitance value of resonance circuit can be changed by the break-make controlling switch module, thus can ensure that electric heater unit all can realize laser heating high-power under low-power, guarantee to cook effect, promote the experience of user, and ensure that switch tube voltage zero-crossing is open-minded, it is to avoid switching tube damages, and avoid switching tube heating serious, and then without strengthening the heat radiation of switching tube.
In addition, when electric capacity adjustment circuit 10 is for when multiple, multiple electric capacity adjust circuit and are connected in series with each other, and each electric capacity adjusts circuit and all includes an a second electric capacity C2 and switch module S1.For example, when electric capacity adjustment circuit 10 is two, two electric capacity are connected between the first electric capacity C1 and ground after adjusting circuit 10 series connection, first end of the second electric capacity C2 of i.e. first electric capacity adjustment circuit and second end of the first electric capacity C1 are connected, second end of the second electric capacity C2 of first end of the second electric capacity C2 of second electric capacity adjustment circuit and first electric capacity adjustment circuit is connected, the second end ground connection of the second electric capacity C2 of second electric capacity adjustment circuit.Further, first electric capacity adjusts the switch module S1 of circuit and the second electric capacity C2 parallel connection of first electric capacity adjustment circuit, and the switch module S1 of second electric capacity adjustment circuit and the second electric capacity C2 of second electric capacity adjustment circuit is in parallel.Thus, controller 20 selects to participate in the electric capacity of resonance by controlling the disconnection of switch module S1 and Guan Bi, thus adjusts resonant frequency, it is ensured that electric heater unit is all capable of laser heating high-power under low-power.
In sum, the electric heater unit for cooking apparatus proposing according to embodiments of the present invention, first end of resonance coil is connected with power supply, second end of resonance coil is connected with the second end of switching tube, first end of the first electric capacity is connected with the second end of resonance coil, second end ground connection of the first electric capacity, the electric capacity that the second electric capacity and switch module are constituted adjusts and is electrically connected between the first electric capacity and ground, being opened or closed of controller control switching tube and switch module.Thus, the resonant capacitance value of resonance circuit can be changed by the break-make controlling switch module, thus can ensure that electric heater unit all can realize laser heating high-power under low-power, guarantee to cook effect, promote the experience of user, and ensure that switch tube voltage zero-crossing is open-minded, it is to avoid switching tube damages, and avoid switching tube heating serious, and then without strengthening the heat radiation of switching tube.
Additionally, the invention allows for a kind of cooking apparatus.
Fig. 4 is the block diagram of cooking apparatus according to embodiments of the present invention.As shown in Figure 4, cooking apparatus 200 includes the electric heater unit 100 of above-described embodiment.
The cooking apparatus proposing according to embodiments of the present invention, can be changed the resonant capacitance value of resonance circuit, thus can ensure that cooking apparatus all can realize laser heating high-power under low-power, it is ensured that culinary art effect, promote the experience of user by electric heater unit.
Wherein, cooking apparatus 200 can be electromagnetic oven, electromagnetic rice cooker or prevention electromagnetic pressure cooker etc..
In the description of this specification, the description of reference term " embodiment ", " some embodiments ", " example ", " specific example " or " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or feature are contained at least one embodiment or the example of the present invention.In this manual, identical embodiment or example are necessarily directed to the schematic representation of above-mentioned term.And, the specific features of description, structure, material or feature can combine in one or more embodiments in office or example in an appropriate manner.Additionally, in the case of not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can be combined and combine by those skilled in the art.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or implicitly include at least one this feature.In describing the invention, " multiple " are meant that at least two, such as two, three etc., unless otherwise expressly limited specifically.
Any process described otherwise above or method describe and are construed as in flow chart or at this, represent module, fragment or the part of the code of the executable instruction including one or more step for realizing specific logical function or process, and the scope of the preferred embodiment of the present invention includes other realization, wherein can not be by order that is shown or that discuss, including according to involved function while basic in the way of or in the opposite order, performing function, this should be understood by embodiments of the invention person of ordinary skill in the field.
Represent in flow charts or the logic described otherwise above at this and/or step, for example, it is considered the sequencing list of executable instruction for realizing logic function, may be embodied in any computer-readable medium, use for instruction execution system, device or equipment (system such as computer based system, including processor or other can be from instruction execution system, device or equipment instruction fetch the system performing instruction), or combine these instruction execution systems, device or equipment and use.For the purpose of this specification, " computer-readable medium " can be any can to comprise, store, communicate, propagate or transmission procedure for instruction execution system, device or equipment or combines these instruction execution systems, device or equipment and the device that uses.The more specifically example (non-exhaustive list) of computer-readable medium includes following: have the electrical connection section (electronic installation) of one or more wiring, portable computer diskette box (magnetic device), random access memory (RAM), read-only storage (ROM), erasable edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk read-only storage (CDROM).Additionally, computer-readable medium can even is that paper or other the suitable media that can print described program on it, because can be for example by optical scanner be carried out to paper or other media, then enter edlin, interpretation or be processed to electronically obtain described program with other suitable methods if desired, being then stored in computer storage.
It should be appreciated that each several part of the present invention can be realized by hardware, software, firmware or combinations thereof.In the above-described embodiment, multiple steps or method can be performed in memory and by suitable instruction execution system by storage software or firmware realize.For example, if realized with hardware, as in another embodiment, can realize by any one in following technology well known in the art or their combination: there is the discrete logic of logic gates for realizing logic function to data-signal, there is the special IC of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that and realize that all or part of step that above-described embodiment method is carried can be by program and completes to instruct related hardware, described program can be stored in a kind of computer-readable recording medium, this program upon execution, including one or a combination set of step of embodiment of the method.
Additionally, each functional unit in each embodiment of the present invention can be integrated in a processing module, it is also possible to be that unit is individually physically present, it is also possible to two or more unit are integrated in a module.Above-mentioned integrated module both can use the form of hardware to realize, it would however also be possible to employ the form of software function module realizes.If described integrated module is using the form realization of software function module and as independent production marketing or use, it is also possible to be stored in a computer read/write memory medium.
Storage medium mentioned above can be read-only storage, disk or CD etc..Although above it has been shown and described that embodiments of the invention, it is understandable that, above-described embodiment is exemplary, it is impossible to be interpreted as limitation of the present invention, and above-described embodiment can be changed, changes, replace and modification by those of ordinary skill in the art within the scope of the invention.
Claims (7)
1. the electric heater unit for cooking apparatus, it is characterised in that include:
Switching tube, the first end ground connection of described switching tube；
Resonance coil, the first end of described resonance coil is connected with power supply, the second end of described resonance coil and described switching tube
The second end be connected；
First electric capacity, the first end of described first electric capacity is connected with the second end of described resonance coil, the of described first electric capacity
Two end ground connection；
At least one electric capacity being connected between described first electric capacity and described ground adjusts circuit, and described electric capacity adjusts circuit and includes
Second electric capacity and the switch module in parallel with described second electric capacity；And
Controller, described controller adjusts the switch module in circuit for controlling described switching tube and at least one electric capacity described
Be opened or closed.
2. the electric heater unit for cooking apparatus as claimed in claim 1, it is characterised in that described switch module is for continuing
Electrical equipment, switching tube, metal-oxide-semiconductor or thyristor.
3. the electric heater unit for cooking apparatus as claimed in claim 1, it is characterised in that when described electric capacity adjusts electricity
When Lu Weiyi,
Described second electric capacity is connected between described first electric capacity and described ground, the first end of described second electric capacity and described first
Second end of electric capacity is connected, the second end ground connection of described second electric capacity, wherein, has between described first electric capacity and the second electric capacity
Having first node, the first end of described switch module is connected with described first node, the second end ground connection of described switch module.
4. the electric heater unit for cooking apparatus as claimed in claim 3, it is characterised in that wherein,
When the operation power of described electric heater unit is more than the first predetermined power, the described switch module of described controller control closes
Close；
When the operation power of described electric heater unit is less than or equal to described first predetermined power, the control of described controller is described
Switch module disconnects.
5. the electric heater unit for cooking apparatus as claimed in claim 1, it is characterised in that when described electric capacity adjusts electricity
When road is multiple, multiple electric capacity adjust circuit and are connected in series with each other.
6. the electric heater unit for cooking apparatus as claimed in claim 1, it is characterised in that described switching tube is IGBT
Pipe.
7. a cooking apparatus, it is characterised in that include the electric heater unit as described in any one of claim 1-6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510162123.XA CN106136845A (en) | 2015-04-07 | 2015-04-07 | Cooking apparatus and the electric heater unit for cooking apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510162123.XA CN106136845A (en) | 2015-04-07 | 2015-04-07 | Cooking apparatus and the electric heater unit for cooking apparatus |
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| CN106136845A true CN106136845A (en) | 2016-11-23 |
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Application publication date: 20161123 |