CN204538995U - The electromagnetic heater of cooking apparatus and cooking apparatus - Google Patents
The electromagnetic heater of cooking apparatus and cooking apparatus Download PDFInfo
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- CN204538995U CN204538995U CN201520205938.7U CN201520205938U CN204538995U CN 204538995 U CN204538995 U CN 204538995U CN 201520205938 U CN201520205938 U CN 201520205938U CN 204538995 U CN204538995 U CN 204538995U
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- electromagnetic heater
- change over
- over switch
- cooking apparatus
- tube
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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Abstract
The utility model discloses the electromagnetic heater of a kind of cooking apparatus and cooking apparatus, device comprises: rectifier bridge stack; Filter circuit, it comprises filter inductance and filter capacitor, one end of filter inductance is connected with the first output of rectifier bridge stack, and the other end of filter inductance is connected with one end of filter capacitor, has first node between the other end of filter inductance and one end of filter capacitor; The discharge resistance in parallel with filter capacitor; Change over switch, its one end is connected with the other end of filter capacitor, other end ground connection; R-T tube; Be connected to the resonance modules between first node and the collector electrode of R-T tube; For detecting the zero cross detection circuit of the zero cross signal of the alternating current of input; Control module, controls to R-T tube and change over switch the mode of heating changing electromagnetic heater respectively according to zero cross signal, thus, when low-power intermittent-heating, avoid switching tube firmly open-minded, prevent switching tube from damaging.
Description
Technical field
The utility model relates to living electric apparatus technical field, particularly relates to a kind of electromagnetic heater for cooking apparatus and a kind of cooking apparatus with this electromagnetic heater.
Background technology
The relevant electromagnetic heater with single IGBT pipe adopts antiresonant circuit usually, and wherein, the resonant parameter of antiresonant circuit is generally arrange under the prerequisite realizing high-power operation.If electromagnetic heater continuous low power runs, there is following shortcoming in correlation technique: the first, and it is open-minded to be difficult to controls IGBT tube voltage zero passage, and IGBT pipe will be open-minded in advance, and the transient current peak value opening moment is crossed conference and damaged IGBT and manage; It two is that the heating of IGBT pipe is serious, needs to increase fin or increase rotation speed of fan to strengthen the heat radiation of IGBT pipe.
In addition, if with default Duty ratio control IGBT pipe turn-on and turn-off to realize low-power heating, then due to filter capacitor charging, IGBT pipe exists when next cycle opens opens phenomenon firmly, easily causes IGBT to burn.
Therefore, there are the needs improved in correlation technique.
Utility model content
The utility model is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, an object of the present utility model is the electromagnetic heater proposing a kind of cooking apparatus, and the electromagnetic heater of this cooking apparatus can solve the IGBT when intermittent-heating and manage the problem firmly opened.
Another object of the present utility model is to propose a kind of cooking apparatus.
To achieve these goals, the electromagnetic heater of a kind of cooking apparatus that the utility model proposes on the one hand, comprising: rectifier bridge stack, the alternating current of input is converted to direct current by described rectifier bridge stack; Filter circuit, described filter circuit comprises filter inductance and filter capacitor, one end of described filter inductance is connected with the first output of described rectifier bridge stack, the other end of described filter inductance is connected with one end of described filter capacitor, has first node between the other end of described filter inductance and one end of described filter capacitor; Change over switch, one end of described change over switch is connected with the other end of described filter capacitor, the other end ground connection of described change over switch; R-T tube; Resonance modules, described resonance modules is connected between the collector electrode of described first node and described R-T tube; Zero cross detection circuit, described zero cross detection circuit is for detecting the zero cross signal of the alternating current of described input; Control module, described control module is connected with the control end of described change over switch with the control pole of described R-T tube, described zero cross detection circuit respectively, and described control module controls to described R-T tube and described change over switch the mode of heating changing described electromagnetic heater respectively according to described zero cross signal.
According to the electromagnetic heater for cooking apparatus that the utility model proposes, discharge resistance is in parallel with filter capacitor, and one end of change over switch is connected with the other end of filter capacitor, and by the other end ground connection of change over switch, control module controls to R-T tube and change over switch the mode of heating changing electromagnetic heater respectively according to zero cross signal, thus, when low-power intermittent-heating, avoid switching tube firmly open-minded, prevent switching tube from damaging, improve switching tube and to generate heat serious situation.
Further, described control module controls described resonance modules and carries out low-power operation with the intermittent heating, and wherein, the work period of described intermittent-heating is synchronous with the work period of described change over switch.
Particularly, described control module controls described electromagnetic heater in the mode of duty ratio and carries out low-power operation with the intermittent heating.
Particularly, described change over switch can be triode, IGBT, metal-oxide-semiconductor or controllable silicon.
Further, described control module controls described change over switch in the zero crossing conducting of the alternating current of described input or shutoff according to described zero cross signal.
Wherein, when described change over switch turns off, described control module controls described R-T tube and turns off.
Particularly, described R-T tube is IGBT, described control module comprises control circuit and main control chip, wherein, described main control chip is connected with described control circuit with described zero cross detection circuit respectively, and described control circuit is connected with the gate pole of described IGBT with the control end of described change over switch respectively.
Further, described electromagnetic heater also comprises discharge resistance, and described discharge resistance is in parallel with described filter capacitor.
To achieve these goals, a kind of cooking apparatus that the utility model proposes on the other hand, comprises described electromagnetic heater.
According to the cooking apparatus that the utility model proposes, the mode of heating of cooking apparatus can be changed by electromagnetic heater, IGBT can be avoided firmly open-minded when low-power intermittent-heating, prevent switching tube from damaging, improve switching tube and to generate heat serious situation.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the electromagnetic heater for cooking apparatus according to the utility model embodiment;
Fig. 2 is the circuit theory diagrams of the electromagnetic heater for cooking apparatus according to the utility model embodiment;
Fig. 3 is the drive singal figure for change over switch in the electromagnetic heater of cooking apparatus according to the utility model embodiment; And
Fig. 4 is the flow chart of the method for heating and controlling of electromagnetic heater according to the utility model embodiment.
Reference numeral:
Rectifier bridge stack 10, filter circuit 20, discharge resistance R1, change over switch K1, R-T tube 30, resonance modules 40, zero cross detection circuit 50, control module 60, filter inductance L1, filter capacitor C1, control circuit 601, main control chip 602, resonance coil L2 and resonant capacitance C2.
Embodiment
Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.
Below with reference to the accompanying drawings describe the utility model embodiment cooking apparatus and for the electromagnetic heater of cooking apparatus and the method for heating and controlling of electromagnetic heater.
Fig. 1 is the circuit theory diagrams of the electromagnetic heater for cooking apparatus according to the utility model embodiment.As shown in Figure 1, the electromagnetic heater for cooking apparatus of the utility model embodiment comprises: rectifier bridge stack 10, filter circuit 20, change over switch K1, R-T tube 30, resonance modules 40, zero cross detection circuit 50 and control module 60.
Wherein, the alternating current of input is converted to direct current by rectifier bridge stack 10, and the first input end of rectifier bridge stack 10 is connected with live wire L, and the second input of rectifier bridge stack 10 is connected with zero line N, and the direct current that rectifier bridge stack 10 exports is as shown in A figure in Fig. 3; Filter circuit 20 is for carrying out filtering to the direct current after rectification, filter circuit 20 comprises filter inductance L1 and filter capacitor C1, one end of filter inductance L1 is connected with the first output of rectifier bridge stack 20, the other end of filter inductance L1 is connected with one end of filter capacitor C1, between the other end of filter inductance L1 and one end of filter capacitor C1, there is first node, wherein, the second output head grounding of rectifier bridge stack 20; One end of change over switch K1 is connected with the other end of filter capacitor C1, the other end ground connection of change over switch K1; Resonance modules 40 is connected between the collector electrode of first node and R-T tube 30, wherein, and the grounded emitter of R-T tube 30; Zero cross detection circuit 50 is for detecting the zero cross signal of the alternating current of input.
Control module 60 is connected with the control end of change over switch K1 with the control pole of R-T tube 30, zero cross detection circuit 50 respectively, and control module 60 controls to R-T tube 30 and change over switch K1 the mode of heating changing electromagnetic heater respectively according to zero cross signal.That is, control module 60 is by being connected to receive zero cross signal with zero cross detection circuit 50, control module 60 is by being connected to control the conducting of R-T tube 30 or shutoff with R-T tube 30, control module 60 is by being connected to control the conducting of change over switch K1 or shutoff with change over switch K1
Specifically, control module 60 controls whether access filter capacitor C1 by change over switch K1, and when control module 60 controls change over switch K1 conducting, filter capacitor C1 accesses filter circuit 20, and filter capacitor C1 enables; When control module 60 controls change over switch K1 shutoff, filter capacitor C1 does not access filter circuit 20, and filter capacitor C1 does not enable.
Further, as depicted in figs. 1 and 2, electromagnetic heater also comprises: discharge resistance R1.Wherein, discharge resistance R1 is in parallel with filter capacitor C1, namely says, one end of discharge resistance R1 is connected with first node, and the other end of discharge resistance R1 is connected with the other end of filter capacitor C1.
Further, according to an embodiment of the present utility model, as shown in Figure 2, R-T tube 30 is IGBT (InsulatedGate Bipolar Transistor, insulated gate bipolar transistor), control module 60 comprises control circuit 601 and main control chip 602, wherein, main control chip 602 is connected with control circuit 601 with zero cross detection circuit 50 respectively, and control circuit 601 is connected with the gate pole of IGBT with the control end of change over switch K1 respectively.According to a concrete example of the present utility model, main control chip 602 can be MCU (Micro Control Unit, microcontroller).
Specifically, control circuit 601 is for driving change over switch K1 and IGBT conducting or shutoff, main control chip 602 can exportable PWM (Pulse Width Modulation, pulse width modulation) control signal to control circuit 601, control circuit 601 reception pwm control signal after, the control end of exportable two-way drive singal to change over switch K1 and the gate pole of IGBT.
Wherein, when main control chip 602 control IGBT manages closed, resonance modules 40 is charged, when main control chip 602 control IGBT pipe disconnects, resonance modules 40 carries out vibrating and producing alternating magnetic field, and the magnetic line of force major part of alternating magnetic field, by pan, produces a large amount of eddy current in the bottom of a pan of pan, thus the heat produced needed for culinary art, realize resonance heating.
In addition, as the example of Fig. 2, resonance modules 40 can comprise resonance coil L2 and resonant capacitance C2, and one end of resonance coil L2 is connected with first node, the other end of resonance coil L2 is connected with the collector electrode of R-T tube 30, and resonant capacitance C2 is connected with resonance coil L2.
Below the control method of control module 60 in the utility model embodiment is described in detail.
According to an embodiment of the present utility model, the control module 60 of electromagnetic heater controls resonance modules 40 and carries out low-power operation with the intermittent heating, and wherein, the work period of intermittent-heating is synchronous with the work period of change over switch K1.。
Further, the control module 60 of electromagnetic heater the mode of duty ratio can control electromagnetic heater and carries out low-power operation with the intermittent heating.
Specifically, the mode of heating of electromagnetic heater comprises laser heating mode and the intermittent heating, wherein, when control module 60 control change over switch K1 be in conducting state always time, electromagnetic heater carries out work in laser heating mode, now, control module 60 exports the drive singal of change over switch K1 to as shown in D figure in Fig. 3; When control module 60 carries out turn-on and turn-off with the Duty ratio control change over switch K1 preset, electromagnetic heater carries out work with the intermittent heating, wherein, the duty ratio preset can be 1/2 or 1/3, now, the drive singal that control module 60 exports change over switch K1 to is as shown in B figure and C figure in Fig. 3, and the duty ratio of B figure is the duty ratio of 1/2, C figure is 1/3.
Further, control module 60 controls change over switch K1 in the zero crossing conducting of the alternating current of input or shutoff according to zero cross signal, as shown in Figure 3.Further, when change over switch K1 turns off, control module 60 controls R-T tube 30 and turns off.In addition, when change over switch K1 conducting, control module 60 also can control R-T tube 30 conducting.
It should be noted that, control module 60 can select mode of heating according to the heating power of electromagnetic heater, when electromagnetic heater is in high power state, selects laser heating mode; When electromagnetic heater is in low power state, select the intermittent heating.
Specifically, when the heating power of electromagnetic heater is greater than predetermined power, control module 60 judges that electromagnetic heater is in high power state, control module 60 controls change over switch K1 and is in conducting state always, filter capacitor C1 accesses filter circuit 20, and electromagnetic heater carries out work in laser heating mode.When the heating power of electromagnetic heater is less than or equal to predetermined power, control module 60 judges that electromagnetic heater is in low power state, control module 60 carries out turn-on and turn-off with the Duty ratio control change over switch K1 preset, enable filter capacitor C1 discontinuously, and change over switch K1 off period forbids R-T tube 30 conducting, thus carry out work with high-power the intermittent heating in a low-power state, R-T tube 30 voltage can be solved well and open problem in advance.Simultaneously, control module 60 controls change over switch K1 and is turned on or off at the near zero-crossing point of alternating current and civil power, like this when starting heating, owing to not starting before filter capacitor C1, there is not electric charge in filter capacitor C1, R-T tube 30 can be open-minded at voltage over zero, thus do not exist and firmly open phenomenon.
According to a preferred embodiment of the present utility model, predetermined power can be 1000W.When heating power is lower than 1000W, being defaulted as low power state, when heating power is higher than 1000W, is high power state.When user control electromagnetic heater heat with certain high-power (such as 1800W) time, control module 60 controls change over switch K1 and is in conducting state always.When user control electromagnetic heater heat with certain small-power (such as 600W) time, control module 60 controls change over switch K1 with duty ratio 1/3 turn-on and turn-off, and electromagnetic heater carries out work with high-power (such as 1800W) the intermittent heating.
According to a specific embodiment of the present utility model, change over switch K1 can be triode, IGBT, MOS (metal-oxid-semiconductor, Metal-oxide-semicondutor) pipe or controllable silicon.
In sum, according to the electromagnetic heater for cooking apparatus that the utility model embodiment proposes, discharge resistance is in parallel with filter capacitor, and one end of change over switch is connected with the other end of filter capacitor, and by the other end ground connection of change over switch, control module controls to R-T tube and change over switch the mode of heating changing electromagnetic heater respectively according to zero cross signal, thus, switching tube can be avoided firmly open-minded when low-power intermittent-heating, prevent switching tube from damaging, improve switching tube and to generate heat serious situation.
In addition, the utility model embodiment also proposed a kind of cooking apparatus, comprises the electromagnetic heater of above-described embodiment.
According to the cooking apparatus that the utility model embodiment proposes, the mode of heating of cooking apparatus can be changed by electromagnetic heater, the problem that switching tube is opened firmly when low-power intermittent-heating can be solved, prevent switching tube from damaging, improve switching tube and to generate heat serious situation.
Wherein, cooking apparatus can be electromagnetic oven, electromagnetic rice cooker or prevention electromagnetic pressure cooker etc.
Based on above-described embodiment, the utility model also proposed a kind of method for heating and controlling of electromagnetic heater.
Fig. 4 is the flow chart of the method for heating and controlling of electromagnetic heater according to the utility model embodiment.Electromagnetic heater comprises the alternating current of input is converted to galvanic rectifier bridge stack, filter circuit, discharge resistance, change over switch, R-T tube and resonance modules, wherein, filter circuit comprises filter inductance and filter capacitor, one end of filter inductance is connected with the first output of rectifier bridge stack, the other end of filter inductance is connected with one end of filter capacitor, between the other end of filter inductance and one end of filter capacitor, there is first node, and discharge resistance is in parallel with filter capacitor, one end of change over switch is connected with the other end of filter capacitor, the other end ground connection of change over switch.
As shown in Figure 4, comprise the following steps according to the method for heating and controlling of the utility model embodiment:
S1: the zero cross signal detecting the alternating current of input.
S2: respectively the mode of heating changing electromagnetic heater is controlled to R-T tube and change over switch according to zero cross signal.
According to an embodiment of the present utility model, respectively R-T tube and change over switch are controlled to change the mode of heating of electromagnetic heater according to zero cross signal and step S2 specifically comprises: resonance modules carries out low-power operation with the intermittent heating, wherein, the work period of intermittent-heating and the work period of change over switch synchronous.Wherein, the mode of duty ratio can control electromagnetic heater and carry out low-power operation with the intermittent heating, preferably, duty ratio can be preset as 1/2 or 1/3.
Further, according to an embodiment of the present utility model, when respectively R-T tube and change over switch being controlled according to zero cross signal, control change over switch in the zero crossing conducting of alternating current of input or shutoff, and when change over switch turns off, control R-T tube and turn off.In addition, when change over switch conducting, also R-T tube conducting can be controlled.
It should be noted that, mode of heating can be selected according to the heating power of electromagnetic heater, when electromagnetic heater is in high power state, select laser heating mode; When electromagnetic heater is in low power state, select the intermittent heating.
Specifically, when the heating power of electromagnetic heater is greater than predetermined power, judge that electromagnetic heater is in high power state, control change over switch and be in conducting state always, filter capacitor access filter circuit, electromagnetic heater carries out work in laser heating mode.When the heating power of electromagnetic heater is less than or equal to predetermined power, control module judges that electromagnetic heater is in low power state, with the capable turn-on and turn-off of Duty ratio control change over switch preset, enable filter capacitor discontinuously, and change over switch off period forbids R-T tube conducting, thus carry out work with high-power the intermittent heating in a low-power state, resonant switch tube voltage can be solved well and open problem in advance.Meanwhile, control change over switch and be turned on or off at the near zero-crossing point of alternating current and civil power, like this when starting heating, owing to not starting before filter capacitor, filter capacitor does not exist electric charge, and R-T tube can be open-minded at voltage over zero, thus do not exist and firmly open phenomenon.
According to a preferred embodiment of the present utility model, predetermined power can be 1000W.When heating power is lower than 1000W, being defaulted as low power state, when heating power is higher than 1000W, is high power state.When user control electromagnetic heater heat with certain high-power (such as 1800W) time, control change over switch be in conducting state always.When user control electromagnetic heater heat with certain small-power (such as 600W) time, control change over switch with duty ratio 1/3 turn-on and turn-off, electromagnetic heater carries out work with high-power the intermittent heating.
In sum, according to the electromagnetic heater for cooking apparatus that the utility model embodiment proposes, discharge resistance is in parallel with filter capacitor, and one end of change over switch is connected with the other end of filter capacitor, and by the other end ground connection of change over switch, detect the zero cross signal of the alternating current of input, and respectively the mode of heating changing electromagnetic heater is controlled to R-T tube and change over switch according to zero cross signal, thus, the problem that switching tube is opened firmly when low-power intermittent-heating can be solved, , switching tube is avoided to damage, improve switching tube to generate heat serious situation.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present utility model or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In description of the present utility model, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
Describe and can be understood in flow chart or in this any process otherwise described or method, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of preferred implementation of the present utility model comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by embodiment person of ordinary skill in the field of the present utility model.
In flow charts represent or in this logic otherwise described and/or step, such as, the sequencing list of the executable instruction for realizing logic function can be considered to, may be embodied in any computer-readable medium, for instruction execution system, device or equipment (as computer based system, comprise the system of processor or other can from instruction execution system, device or equipment instruction fetch and perform the system of instruction) use, or to use in conjunction with these instruction execution systems, device or equipment.With regard to this specification, " computer-readable medium " can be anyly can to comprise, store, communicate, propagate or transmission procedure for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically (non-exhaustive list) of computer-readable medium comprises following: the electrical connection section (electronic installation) with one or more wiring, portable computer diskette box (magnetic device), random access memory (RAM), read-only memory (ROM), erasablely edit read-only memory (EPROM or flash memory), fiber device, and portable optic disk read-only memory (CDROM).In addition, computer-readable medium can be even paper or other suitable media that can print described program thereon, because can such as by carrying out optical scanner to paper or other media, then carry out editing, decipher or carry out process with other suitable methods if desired and electronically obtain described program, be then stored in computer storage.
Should be appreciated that each several part of the present utility model can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple step or method can with to store in memory and the software performed by suitable instruction execution system or firmware realize.Such as, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: the discrete logic with the logic gates for realizing logic function to data-signal, there is the application-specific integrated circuit (ASIC) of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, this program perform time, step comprising embodiment of the method one or a combination set of.
In addition, each functional unit in each embodiment of the utility model can be integrated in a processing module, also can be that the independent physics of unit exists, also can be integrated in a module by two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.If described integrated module using the form of software function module realize and as independently production marketing or use time, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.Although illustrate and described embodiment of the present utility model above, be understandable that, above-described embodiment is exemplary, can not be interpreted as restriction of the present utility model, those of ordinary skill in the art can change above-described embodiment, revises, replace and modification in scope of the present utility model.
Claims (9)
1. for an electromagnetic heater for cooking apparatus, it is characterized in that, comprising:
Rectifier bridge stack, the alternating current of input is converted to direct current by described rectifier bridge stack;
Filter circuit, described filter circuit comprises filter inductance and filter capacitor, one end of described filter inductance is connected with the first output of described rectifier bridge stack, the other end of described filter inductance is connected with one end of described filter capacitor, has first node between the other end of described filter inductance and one end of described filter capacitor;
Change over switch, one end of described change over switch is connected with the other end of described filter capacitor, the other end ground connection of described change over switch;
R-T tube;
Resonance modules, described resonance modules is connected between the collector electrode of described first node and described R-T tube;
Zero cross detection circuit, described zero cross detection circuit is for detecting the zero cross signal of the alternating current of described input; And
Control module, described control module is connected with the control end of described change over switch with the control pole of described R-T tube, described zero cross detection circuit respectively, and described control module controls to described R-T tube and described change over switch the mode of heating changing described electromagnetic heater respectively according to described zero cross signal.
2. as claimed in claim 1 for the electromagnetic heater of cooking apparatus, it is characterized in that, described control module controls described resonance modules and carries out low-power operation wherein with the intermittent heating, and the work period of described intermittent-heating is synchronous with the work period of described change over switch.
3., as claimed in claim 2 for the electromagnetic heater of cooking apparatus, it is characterized in that, described control module controls described electromagnetic heater in the mode of duty ratio and carries out low-power operation with the intermittent heating.
4. the electromagnetic heater for cooking apparatus according to any one of claim 1-3, is characterized in that, described change over switch is triode, IGBT, metal-oxide-semiconductor or controllable silicon.
5. as claimed in claim 2 for the electromagnetic heater of cooking apparatus, it is characterized in that, described control module controls described change over switch in the zero crossing conducting of the alternating current of described input or shutoff according to described zero cross signal.
6. as claimed in claim 5 for the electromagnetic heater of cooking apparatus, it is characterized in that, when described change over switch turns off, described control module controls described R-T tube and turns off.
7. as claimed in claim 1 for the electromagnetic heater of cooking apparatus, it is characterized in that, described R-T tube is IGBT, described control module comprises control circuit and main control chip, wherein, described main control chip is connected with described control circuit with described zero cross detection circuit respectively, and described control circuit is connected with the gate pole of described IGBT with the control end of described change over switch respectively.
8., as claimed in claim 1 for the electromagnetic heater of cooking apparatus, it is characterized in that, described electromagnetic heater also comprises discharge resistance, and described discharge resistance is in parallel with described filter capacitor.
9. a cooking apparatus, is characterized in that, comprises the electromagnetic heater for cooking apparatus according to any one of claim 1-8.
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| CN201520205938.7U CN204538995U (en) | 2015-04-07 | 2015-04-07 | The electromagnetic heater of cooking apparatus and cooking apparatus |
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| CN201520205938.7U CN204538995U (en) | 2015-04-07 | 2015-04-07 | The electromagnetic heater of cooking apparatus and cooking apparatus |
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| CN106160534A (en) * | 2015-04-07 | 2016-11-23 | 佛山市顺德区美的电热电器制造有限公司 | Cooking apparatus, the electromagnetic heater of cooking apparatus and method for heating and controlling thereof |
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