CN106136846A - 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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- CN106136846A CN106136846A CN201510162133.3A CN201510162133A CN106136846A CN 106136846 A CN106136846 A CN 106136846A CN 201510162133 A CN201510162133 A CN 201510162133A CN 106136846 A CN106136846 A CN 106136846A
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Abstract
The invention discloses the electric heater unit of a kind of cooking apparatus and cooking apparatus, this device includes: the first inductance；IGBT manages；First and second resonance coils, the first end of the first resonance coil and the first inductance are connected, and the second end of the first resonance coil and the first end of the second resonance coil are connected, and the second end of the second resonance coil is connected with the second end of IGBT pipe；First electric capacity；Second and the 3rd electric capacity, the first end of the second electric capacity and the first end of the first resonance coil are connected, and the second end of the second electric capacity and the first end of the 3rd electric capacity are connected, and the second end of the 3rd electric capacity and the second end of the second resonance coil are connected；Switch module, the first node between its first end and the first and second resonance coils is connected, and the Section Point between its second end and second and the 3rd electric capacity is connected；Controller, for controlling IGBT pipe and being opened or closed of switch module, thus by control resonance manner, it is ensured that IGBT pipe under high-power and low-power can voltage zero-cross open-minded, it is to avoid IGBT pipe damages.
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
The related electric heater unit with single IGBT pipe generally uses antiresonant circuit.In the related, in parallel
The resonant parameter of resonance circuit is usually setting on the premise of realizing high-power operation.But, it has the drawback that,
It for the resonant parameter in high-power lower setting, if electric heater unit continuous low power runs, then is difficult to control to IGBT pipe
Voltage zero-cross is open-minded, and IGBT pipe will be open-minded in advance, and the transient current peak value opening moment crosses conference damage IGBT pipe, and
And it is serious to also result in the heating of IGBT pipe, thus needs to increase fin or increase rotation speed of fan to strengthen the heat radiation of IGBT pipe.
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, the one of the present invention
Purpose is to propose the electric heater unit of a kind of cooking apparatus, and the electric heater unit of this cooking apparatus is at high-power and continuous low work(
IGBT tube voltage zero passage can be controlled open-minded, it is to avoid IGBT pipe damages under rate.
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:
First inductance, the first end of described first inductance is connected with power supply；IGBT manages, the first end ground connection of described IGBT pipe；The
One resonance coil and the second resonance coil, the first end of described first resonance coil is connected with the second end of described first inductance,
Second end of described first resonance coil is connected with the first end of described second resonance coil, the second of described second resonance coil
End is connected with the second end of described IGBT pipe, wherein, has between described first resonance coil and described second resonance coil
First node；First electric capacity, the first end of described first electric capacity is connected with the first end of described first resonance coil, and described
Second end ground connection of one electric capacity；Second electric capacity and the 3rd electric capacity, the first end of described second electric capacity and described first resonance coil
The first end be connected, the second end of described second electric capacity is connected with the first end of described 3rd electric capacity, the of described 3rd electric capacity
Two ends are connected with the second end of described second resonance coil, wherein, have second section between described second electric capacity and the 3rd electric capacity
Point；Switch module, the first end of described switch module is connected with described first node, the second end of described switch module and institute
State Section Point to be connected；Controller, described controller is for controlling the disconnection of described IGBT pipe and described switch module or closing
Close.
The electric heater unit for cooking apparatus proposing according to embodiments of the present invention, first end and first of the first resonance coil
Second end of inductance is connected, and the second end of the first resonance coil and the first end of the second resonance coil are connected, the second resonance coil
The second end be connected with the second end of IGBT pipe, the first end of the second electric capacity and the first end of the first resonance coil are connected, the
First end of the second end of two electric capacity and the 3rd electric capacity is connected, the second end of the 3rd electric capacity and the second end phase of the second resonance coil
Even, the first node between the first end of switch module and the first resonance coil and the second resonance coil is connected, switch module
Section Point between second end and the second electric capacity and the 3rd electric capacity is connected, can be by controller control IGBT pipe and switches set
Being opened or closed of part.Thus, the resonance manner by the changeable electric heater unit of switch module, and change resonance electricity simultaneously
The resonant capacitance value on road and resonance inductance value, thus can ensure IGBT pipe under high-power and continuous low power ruuning situation all
Can voltage zero-cross open-minded, it is to avoid IGBT pipe damages, and avoids the heating of IGBT pipe serious, and then without strengthening IGBT pipe
Heat radiation.
Specifically, described switch module can be relay, IGBT pipe, metal-oxide-semiconductor or thyristor.
Specifically, when the operation power of described electric heater unit is more than the first predetermined power, open described in the control of described controller
Close assembly Guan Bi；When the operation power of described electric heater unit is less than or equal to described first predetermined power, described controller
Control described switch module to disconnect.
To achieve these goals, a kind of cooking apparatus that another aspect of the present invention embodiment proposes, including described electrical heating
Device.
The cooking apparatus proposing according to embodiments of the present invention, by the changeable resonance manner of electric heater unit, and changes humorous simultaneously
Capacitance of shaking and resonance inductance value, thus can ensure that IGBT pipe all can electricity under high-power and continuous low power ruuning situation
Press through zero open-minded, it is to avoid IGBT pipe damages, and avoid the heating of IGBT pipe serious, and then without strengthening the heat radiation of IGBT pipe.
Brief description
Fig. 1 is the circuit theory diagrams of the electric heater unit for cooking apparatus according to an embodiment of the invention, its breaker in middle
Assembly disconnects；
Fig. 2 is the circuit theory diagrams of the electric heater unit for cooking apparatus according to an embodiment of the invention, its breaker in middle
Assembly closes；And
Fig. 3 is the block diagram of cooking apparatus according to embodiments of the present invention.
Reference:
Electric heater unit the 100th, first inductance L1, IGBT pipe Q1, the first resonance coil L2, the second resonance coil L3,
First electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, switch module S1, controller the 10th, power supply the 20th, pan are the 30th,
Diode D1 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, wherein identical from start to finish
Or similar label represents same or similar element or has the element of same or like function.Retouch below with reference to accompanying drawing
The embodiment stated 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 cooking apparatus and the electric heater unit for cooking apparatus of the air-conditioner of the embodiment of the present invention are described,
Electric heater unit 100 is for carrying out heating to cook to pan.
As depicted in figs. 1 and 2, the electric heater unit 100 for cooking apparatus according to embodiments of the present invention includes: first
Inductance L1, IGBT pipe Q1, the first resonance coil L2, the second resonance coil L3, the first electric capacity C1, the second electric capacity C2,
3rd electric capacity C3, switch module S1 and controller 10.
Wherein, first end of the first inductance L1 is connected with power supply 20；The first end i.e. grounded emitter of IGBT pipe Q1；The
Second end of first end of one resonance coil L2 and the first inductance L1 is connected, second end and second of the first resonance coil L2
First end of resonance coil L3 is connected, the second end i.e. colelctor electrode of second end of the second resonance coil L3 and IGBT pipe Q1
It is connected, wherein, between the first resonance coil L2 and the second resonance coil L3, there is first node；The of first electric capacity C1
One end is connected with first end of the first resonance coil L2, the second end ground connection of the first electric capacity C1；The first of second electric capacity C2
End is connected with first end of the first resonance coil L2, and second end of the second electric capacity C2 and first end of the 3rd electric capacity C3 are connected,
Second end of second end of the 3rd electric capacity C3 and the second resonance coil L3 is connected, wherein, and the second electric capacity C2 and the 3rd electric capacity
There is between C3 Section Point；First end of switch module S1 is connected with first node, second end of switch module S1 and
Two nodes are connected；Controller 10 is for controlling being opened or closed of IGBT pipe Q1 and switch module S1.
Specifically, alternating current such as 220V commercial power rectification can be direct current by power supply 20, the first inductance L1 and filter capacitor
Direct current after rectification is filtered by the filter circuit constituting, and filtered direct current is supplied to the first resonance coil L2
With the second resonance coil L3, and by being opened or closed of switch module S1 is controlled, adjustable the first resonance line
Connected mode between circle L2 and the second resonance coil L3 and the second electric capacity C2 and the 3rd electric capacity C3, and then change resonance side
Formula.
Further, electric heater unit 100 may also include driver, the driver control end i.e. grid with IGBT pipe Q1 respectively
Pole is connected with controller 10.So exportable PWM of controller 10 (Pulse Width Modulation, pulse width modulation)
Control signal to driver to control being opened or closed of IGBT pipe Q1, wherein, when controller 10 controls IGBT pipe Q1
During Guan Bi, the first resonance coil L2 and the second resonance coil L3 is charged, and breaks when controller 10 controls IGBT pipe Q1
When opening, the first resonance coil L2, the second resonance coil L3, the second electric capacity C2 and the 3rd electric capacity C3 are with switch module S1
The resonance manner determining vibrates, and thus produces alternating magnetic field around the first resonance coil L2 and the second resonance coil L3,
The magnetic line of force major part of alternating magnetic field passes through pan 30, and produces a large amount of eddy current in the bottom of a pan of pan 30, thus produces and cook
Heat needed for preparing food, it is achieved resonance heats.
Specifically, such as the example of Fig. 1, when controller 10 controls switch module S1 disconnection, the first resonance coil L2
Connect with the second resonance coil L3, the second electric capacity C2 and the 3rd electric capacity C3 series connection, and the first resonance coil after series connection
L2 and the second resonance coil L3 again with connect after the second electric capacity C2 and the 3rd electric capacity C3 in parallel, electric heater unit 100 with
Resonance manner in parallel after first connecting runs, and the first resonance coil L2 and the second resonance coil L3 constitutes the resonance of resonance circuit
Inductance, the second electric capacity C2 and the 3rd electric capacity C3 constitute the resonant capacitance of resonance circuit；Such as the example of Fig. 2, when controller 10
During control switch module S1 Guan Bi, the first resonance coil L2 and the second electric capacity C2 is in parallel, the second resonance coil L3 and the 3rd
Electric capacity C3 is in parallel, and the first resonance coil L2 after parallel connection and the second electric capacity C2 again with in parallel after the second resonance coil
L3 and the 3rd electric capacity C3 series connection, electric heater unit 100 runs with the resonance manner of series connection after first parallel connection, the second resonance coil
L3 and the 3rd electric capacity C3 constitutes main resonant circuit, and the first resonance coil L2 and the second electric capacity C2 constitutes secondary resonance circuit, humorous
Parameter of shaking mainly is determined by the second resonance coil L3 and the 3rd electric capacity C3.
Wherein, during resonance manner in parallel after being switched to first connect by the resonance manner of series connection after first in parallel, i.e. formerly connect
Under the resonance manner of rear parallel connection, owing to the first resonance coil L2 and the second resonance coil L3 connects, the inductance value of resonant inductance
It is the first resonance coil L2 and the series value of the second resonance coil L3, owing to the second electric capacity C2 and the 3rd electric capacity C3 connects,
The capacitance of resonant capacitance is the series value of the second electric capacity C2 and the 3rd electric capacity C3, the electricity less than the 3rd electric capacity C3 for the series value
Capacitance, and the capacitance less than the second electric capacity C2, the capacitance of resonant capacitance diminishes, and is stored in resonant capacitance in resonant process
On electric charge reduce, so when low-power is run continuously IGBT pipe Q1 to be well controlled in voltage over zero open-minded,
Thus avoid IGBT pipe Q1 to damage.
Switched to by resonance manner in parallel after first connecting first in parallel after the resonance manner of series connection when, i.e. formerly in parallel after series connection
Resonance manner under, the second resonance coil L3 and the 3rd electric capacity C3 carries out parallel resonance, the first resonance coil L2 and second
Electric capacity C2 carries out parallel resonance, using the second resonance coil L3 and the 3rd electric capacity C3 as main resonance process, resonance circuit
Resonant capacitance is close to the capacitance of the 3rd electric capacity C3, and the series value more than the second electric capacity C2 and the 3rd electric capacity C3, humorous
The capacitance of electric capacity of shaking increases, and the electric charge that is stored in resonant process on resonant capacitance increases, so when high-power operation
It is open-minded that IGBT pipe Q1 can well be controlled in voltage over zero, thus avoids IGBT pipe Q1 to damage.
Thus, the embodiment of the present invention propose for the electric heater unit of cooking apparatus, the first end of the first resonance coil and the
Second end of one inductance is connected, and the second end of the first resonance coil and the first end of the second resonance coil are connected, the second resonance line
Second end of circle is connected with the second end of IGBT pipe, and the first end of the second electric capacity and the first end of the first resonance coil are connected,
First end of the second end of the second electric capacity and the 3rd electric capacity is connected, the second end of the 3rd electric capacity and the second end of the second resonance coil
Being connected, the first node between the first end of switch module and the first resonance coil and the second resonance coil is connected, switch module
The second end and the second electric capacity and the 3rd electric capacity between Section Point be connected, can by controller control IGBT pipe and switch
Being opened or closed of assembly.Thus, the resonance manner by the changeable electric heater unit of switch module, and change resonance simultaneously
The resonant capacitance value of circuit and resonance inductance value, thus can ensure IGBT pipe under high-power and continuous low power ruuning situation
All can voltage zero-cross open-minded, it is to avoid IGBT pipe damages, and avoids the heating of IGBT pipe serious, and then without strengthening IGBT
The heat radiation of pipe.
Further, according to one embodiment of present invention, as illustrated in fig. 1 and 2, IGBT pipe Q1 also includes itself: two
Pole pipe D1, diode D1 are connected in reverse parallel between the first end and second end of IGBT pipe Q1, i.e. the anode of diode D1
Being connected with first end of IGBT pipe Q1, the negative electrode of diode D1 is connected with second end of IGBT pipe Q1.
A specific example according to the present invention, controller 10 can be MCU (Micro Control Unit, microcontroller).
A specific embodiment according to the present invention, switch module S1 can be relay, IGBT pipe, metal-oxide-semiconductor or controllable silicon
Pipe.
A specific embodiment according to the present invention, when the operation power of electric heater unit is more than the first predetermined power, control
Device 10 controls switch module S1 Guan Bi；When the operation power of electric heater unit is less than or equal to the first predetermined power, control
Device 10 controls switch module S1 and disconnects.
It is to say, controller 10 can obtain the operation power of electric heater unit in real time, and according to the operation work(of electric heater unit
Rate control switch module S1 is opened or closed.Specifically, when the operation power of electric heater unit is more than the first predetermined power,
Controller 10 judges that electric heater unit 100 is in high power operation state, and controller 10 controls switch module S1 Guan Bi, with
The capacitance making resonant capacitance becomes big；When the operation power of electric heater unit is less than or equal to the first predetermined power, controller
10 judge that electric heater unit 100 is in low power operating state, and controller 10 controls switch module S1 and disconnects, so that resonance
The capacitance of electric capacity diminishes.
According to a preferred embodiment of the present invention, the first predetermined power can be 1000W.When electric heater unit 100 is with a certain
During individual high-power (such as 2000W) heating, controller 10 controls switch module S1 Guan Bi, and electric heater unit 100 is with phase
After Bing Lian, the resonance manner of series connection carries out resonance heating；When electric heater unit 100 adds with some small-power (such as 500W)
During heat, controller 10 controls switch module S1 and disconnects, and electric heater unit 100 is carried out with resonance manner in parallel after first connecting
Resonance heats.
So, electric heater unit all can ensure that IGBT tube voltage zero passage is open-minded high-power under continuous low power, it is to avoid IGBT
Pipe damages, and avoids the heating of IGBT pipe serious, it is not necessary to strengthen the heat radiation of IGBT pipe.
Additionally, the invention allows for a kind of cooking apparatus.
Fig. 3 is the block diagram of cooking apparatus according to embodiments of the present invention.As it is shown on figure 3, cooking apparatus 200 includes
The electric heater unit 100 of above-described embodiment.
The cooking apparatus proposing according to embodiments of the present invention, by the changeable resonance manner of electric heater unit, and changes humorous simultaneously
Capacitance of shaking and resonance inductance value, thus can ensure that IGBT pipe all can electricity under high-power and continuous low power ruuning situation
Press through zero open-minded, it is to avoid IGBT pipe damages, and avoid the heating of IGBT pipe serious, and then without strengthening the heat radiation of IGBT pipe.
Wherein, cooking apparatus 200 can be electromagnetic oven, electromagnetic rice cooker or prevention electromagnetic pressure cooker etc..
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specific example ",
Or specific features, structure, material or the feature bag that the description of " some examples " etc. means to combine this embodiment or example describes
It is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term necessarily
It is directed to identical embodiment or example.And, the specific features of description, structure, material or feature can be arbitrary
Individual or multiple embodiment or example combine in an appropriate manner.Additionally, in the case of not conflicting, the skill of this area
The feature of the different embodiment described in this specification or example and different embodiment or example can be combined by art personnel
And combination.
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 be expressed or hidden
Include at least one this feature containing ground.In describing the invention, " multiple " are meant that at least two, such as two, three
Individual 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 and include one
Or more are for realizing module, fragment or the part of the code of the executable instruction of the step of specific logical function or process,
And the scope of the preferred embodiment of the present invention includes other realization, wherein can not press order that is shown or that discuss,
Including according to involved function while basic in the way of or in the opposite order, perform function, this should be by the present invention's
Embodiment person of ordinary skill in the field understood.
Represent in flow charts or the logic described otherwise above at this and/or step, for example, it is possible to be considered as reality
The sequencing list of the executable instruction of existing logic function, may be embodied in any computer-readable medium, for instruction
Execution system, device or equipment (system such as computer based system, including processor or other can perform from instruction
System, device or equipment instruction fetch the system performing instruction) use, or combine these instruction execution systems, device or set
Standby 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 uses
Device.The more specifically example (non-exhaustive list) of computer-readable medium includes following: have one or more cloth
The electrical connection section (electronic installation) of line, portable computer diskette box (magnetic device), random access memory (RAM), only
Reading memory (ROM), erasable read-only storage (EPROM or flash memory) of editing, fiber device, and
Portable optic disk read-only storage (CDROM).In addition, computer-readable medium can even is that can print on it described
The paper of program or other suitable media, because then can carry out for example by carrying out optical scanner to paper or other media
Edit, interpret or be processed to electronically obtain described program with other suitable methods if desired, 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 above-mentioned reality
Execute in mode, the software that multiple steps or method can be performed in memory and by suitable instruction execution system by storage or
Firmware realizes.For example, if realized with hardware, and the same in another embodiment, available well known in the art under
Any one in row technology or their combination realize: have the logic gates for realizing logic function to data-signal
Discrete logic, there is the special IC of suitable combinational logic gate circuit, programmable gate array (PGA), existing
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 is can
Completing to instruct related hardware by program, 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 each
Individual unit is individually physically present, it is also possible to two or more unit are integrated in a module.Above-mentioned integrated module was both
The form that can use hardware realizes, it would however also be possible to employ the form of software function module realizes.If described integrated module with
The form of software function module realizes and as independent production marketing or when using, it is also possible to be stored in a computer-readable
Take in storage 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 to be understood that above-described embodiment is exemplary, it is impossible to be interpreted as limitation of the present invention,
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 (4)
1. the electric heater unit for cooking apparatus, it is characterised in that include:
First inductance, the first end of described first inductance is connected with power supply；
IGBT manages, the first end ground connection of described IGBT pipe；
Second end of the first resonance coil and the second resonance coil, the first end of described first resonance coil and described first inductance
Being connected, the second end of described first resonance coil is connected with the first end of described second resonance coil, described second resonance coil
The second end be connected with the second end of described IGBT pipe, wherein, described first resonance coil and described second resonance coil it
Between there is first node；
First electric capacity, the first end of described first electric capacity is connected with the first end of described first resonance coil, described first electric capacity
Second end ground connection；
Second electric capacity and the 3rd electric capacity, the first end of described second electric capacity is connected with the first end of described first resonance coil, institute
The second end stating the second electric capacity is connected with the first end of described 3rd electric capacity, and the second end of described 3rd electric capacity is second humorous with described
Shake coil the second end be connected, wherein, between described second electric capacity and the 3rd electric capacity, there is Section Point；
Switch module, the first end of described switch module is connected with described first node, the second end of described switch module and institute
State Section Point to be connected；And
Controller, described controller is for controlling described IGBT pipe and being opened or closed of described switch module.
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, IGBT pipe, metal-oxide-semiconductor or thyristor.
3. the electric heater unit for cooking apparatus as claimed in claim 1, 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.
4. a cooking apparatus, it is characterised in that include the electric heater unit as described in any one of claim 1-3.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510162133.3A CN106136846B (en) | 2015-04-07 | 2015-04-07 | Cooking apparatus and electric heater unit for cooking apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510162133.3A CN106136846B (en) | 2015-04-07 | 2015-04-07 | Cooking apparatus and electric heater unit for cooking apparatus |
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| Publication number | Publication date |
|---|---|
| CN106136846B (en) | 2018-11-23 |
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