CN205726494U - A kind of stable electromagnetic heating control system - Google PatentsA kind of stable electromagnetic heating control system Download PDF
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- CN205726494U CN205726494U CN201620395209.7U CN201620395209U CN205726494U CN 205726494 U CN205726494 U CN 205726494U CN 201620395209 U CN201620395209 U CN 201620395209U CN 205726494 U CN205726494 U CN 205726494U
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- 230000000875 corresponding Effects 0.000 description 5
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- 230000001276 controlling effects Effects 0.000 description 2
- 229910000461 iron(III) oxide Inorganic materials 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
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This programme proposes a kind of stable electromagnetic heating control system, including controller, filtration module, rectification module, power component and the driving module being connected with power component, it is characterised in that: described electromagnetic heating control system also includes so that being input to drive the voltage control module of the voltage stabilization of module.Described voltage control module includes PFC unit, and described PFC unit input connects rectification module, and described PFC unit outfan connects and drives module input, is input to driving module with after the voltage stabilization that export by rectification module.Arranging FPFC module makes the voltage being input to drive module be stablized, and the circuit stability for subsequent drive module is promoted, and the most effectively promotes the power factor of whole system, and then promotes the stability of whole system.
The present invention relates to electromagnetic heating technique field, be specifically related to a kind of stable electromagnetic heating control system.
Along with developing rapidly of electromagnetic induction heating technology, kitchen appliance ratio based on electromagnetic inductive heating principle As got more and more based on electromagnetic heating technique electromagnetic stove, based on IH heating technique electric cooker etc., in prior art Electromagnetic heating control system generally includes alternating current power supply, filtration module, rectifying and wave-filtering and IBGT, prior art In when alternating current power supply rectified and filtering after, straight voltage is directly applied to all kinds of load or drive circuit Time upper, although the waveform of input voltage is sinusoidal wave, but the waveform of input current is burst pulse, thus makes Electric current in circuit contains a large amount of harmonic component, and makes the power factor of whole circuit be greatly lowered.
Simultaneously as current waveform and the delayed phase of voltage waveform, system disturbance makes system in addition In power factor be generally only capable of reaching 0.5～about 0.7, it is low that actually active power accounts for total power consumption proportion, especially It is when load changes, and the degree that electric energy is used effectively is the most relatively low.Therefore electromagnetism is added The improvement of hot systems promotes electric energy effective rate of utilization, saves energy is promoted the efficiency of heating surface and system stability has Significance.
[utility model content]
This utility model scheme proposes stable electromagnetic heating control system, it is intended to improve above-mentioned to a certain extent Problem, promotes Circuits System stability and the efficiency of heating surface.
For reaching above technique effect, this utility model adopts the following technical scheme that
A kind of stable electromagnetic heating control system, including controller, filtration module, rectification module, power Element and the driving module being connected with power component, described electromagnetic heating control system also includes so that being input to Drive the voltage control module of the voltage stabilization of module.
Further scheme, described voltage control module includes boosting unit, and described boosting unit input is even Connecing rectification module, described boosting unit outfan connects driving module input, will enter into driving module Voltage carry out boosting rectifier control.
Further scheme, described voltage control module includes PFC unit, and described PFC unit input is even Connecing rectification module, described PFC unit outfan connects driving module input, with exported by rectification module It is input to after voltage stabilization drive module.
Further scheme, described PFC unit is voltage lifting PFC unit, described voltage lifting PFC unit input electricity Pressure is 220～350V, and output voltage is 310V～450V.
Further scheme, described electromagnetic heating control system also includes for switching voltage control module break-make Switch module, switching switch module on off operating mode is to access voltage control module or to exit described electromagnetism and add Thermal control system.
Further scheme, described driving module includes resonant element, converter unit and switch unit, switching Described switch unit is to change converter unit and resonant element syntagmatic.
Further scheme, described switch unit includes the controlled electron connected in series or in parallel with converter unit Switching device, switching controllable electronic switch device on off operating mode closes with resonant element combination to change converter unit System, and then change the resonant frequency of electromagnetic heating control system.
Further scheme, described controllable electronic switch device is relay or A.C. contactor or quasiconductor is opened Close.
Further scheme, described power component is IGBT, and described driving module also includes being connected with IGBT Drive circuit.
Further scheme, described drive circuit is the single tube drive circuit being connected with IGBT；Or described driving Circuit is the half-bridge drive circuit being connected with IGBT；Or described drive circuit is that the full-bridge being connected with IGBT drives Galvanic electricity road.
The beneficial effect of this utility model scheme:
1, a kind of stable electromagnetic heating control system, including controller, filtration module, rectification module, merit Rate element and the driving module being connected with power component, described electromagnetic heating control system also includes so that inputting To the voltage control module of the voltage stabilization driving module, voltage control module is set and makes to be input to drive mould The voltage of block is stablized, and the circuit stability for subsequent drive module is promoted, and then promotes whole system The stability of system, can be at Control of Voltage, photovoltaic conversion, voltage in certain voltage control module this programme Reason, voltage correction, voltage-tracing etc..
2, further scheme, described voltage control module includes boosting unit, described boosting unit input Connecting rectification module, described boosting unit outfan connects driving module input, will enter into driving mould The voltage of block carries out boosting rectifier control.In the case of boosting rectifier control equal-wattage, can effectively reduce system power, Components and parts and circuit are all played a good protection.
3, described voltage control module includes PFC unit, and described PFC unit input connects rectification module, Described PFC unit outfan connects and drives module input, with defeated after the voltage stabilization that exported by rectification module Enter to driving module.Further scheme, described PFC unit is voltage lifting PFC unit, described voltage lifting PFC Unit input voltage is 220～350V, and output voltage is 310V～450V.Be combined with capability correction by boosting Together, it is achieved the lifting of power factor, efficiency of heating surface new-added item system stability simultaneously is promoted.Add boosting PFC module can realize the correction of power factor and make electrical network input current waveform perfect tracking electrical network input voltage Waveform so that input current waveform is sinusoidal wave and and voltage waveform same phase.In the ideal case, can be by The load equivalent of commutator is a pure resistance, and PF value now is 1.
4, described driving module includes resonant element, converter unit and switch unit, switches described switch unit To change converter unit and resonant element syntagmatic.Described switch unit includes connecting with converter unit or also The controllable electronic switch device that connection connects, switching controllable electronic switch device on off operating mode is to change converter unit With resonant element syntagmatic, and then change electromagnetic heating control system resonant frequency.Described controlled electron Switching device is relay or A.C. contactor or semiconductor switch.Frequency-variable module is set and can change system Resonant frequency adapts to the application of different occasion, embodies voltage control module in such cases for carrying simultaneously Rise the necessity of systematic function.
[accompanying drawing explanation]
With embodiment, this programme is further described in detail below in conjunction with the accompanying drawings.
Fig. 1 is half bridge control system of prior art electromagnetic induction heating；
Fig. 2 is the full-bridge control system of prior art electromagnetic induction heating；
Fig. 3 is a kind of Electromagnetic Heating half bridge control system adapting to the heating of unlike material pan of this utility model；
Fig. 4 is a kind of Electromagnetic Heating half bridge control system adapting to the heating of unlike material pan of this utility model；
Fig. 5 is this utility model specific embodiment one resonant element and switch unit circuit diagram；
Fig. 6 is this utility model specific embodiment two resonant element and switch unit circuit diagram；
Fig. 7 is this utility model specific embodiment three resonant element and switch unit circuit diagram；
Fig. 8 is this utility model specific embodiment four resonant element and switch unit circuit diagram；
Fig. 9 is that this utility model specific embodiment five drives module and power component annexation schematic diagram；
Figure 10 is that this utility model scheme utilizes aluminum pot to heat test curve oscillogram.
[detailed description of the invention]
For making technical solutions of the utility model embodiment purpose, technical scheme and advantage clearer, knot below Close accompanying drawing the technical scheme of this utility model embodiment is clearly explained and illustrated, but following embodiment It is only preferred embodiment of the present utility model rather than whole embodiment.Based on the embodiment in embodiment, Those skilled in the art are obtained other embodiments on the premise of not making creative work, broadly fall into this The protection domain of utility model.
With reference to explained below and accompanying drawing, it will be clear that these and other aspects of embodiment of the present utility model. Describe at these and in accompanying drawing, specifically disclose some particular implementation in embodiment of the present utility model Represent some modes of the principle implementing embodiment of the present utility model, but it is to be understood that this practicality is new The scope of the embodiment of type is not limited.On the contrary, embodiment of the present utility model includes falling into appended weighting All changes, amendment and equivalent in the range of the spirit of profit claim and intension.
For making embodiment purpose, technical scheme and the advantage of this programme more clear below in conjunction with the accompanying drawings 1 and attached The prior art that background technology is mentioned by Fig. 2 is further elaborated explanation.
Half bridge control system and Fig. 2 if Fig. 1 is prior art electromagnetic induction heating are prior art electromagnetism sense The full-bridge control system figure that should heat includes alternating current power supply 1, filtration module 2 and rectification module 3, power unit Part 4 and the driving module 5 driving power component to work constitute Circuits System, rectification module 3 in prior art The voltage of output is directly inputted to drive module 5, and consequently leads to electromagnetic heating control system in prior art will Straight voltage is directly applied to that load is upper or time on drive circuit, although the waveform of input voltage is sinusoidal wave, But the waveform of input current is burst pulse, thus makes line current contain a large amount of harmonic component, and makes conversion The power factor of device is greatly lowered.
Meanwhile, existing electromagnetic heating system mostly is specific resonant frequency is definite value or (in relative Repeat Determine value range) the usual resonant frequency range of prior art is below 50KHz, this frequency range is irony or not Rust steel pan resonance matching range, it is impossible to realize switching and the expansion of multiband, so can only under prior art Irony or rustless steel pan are heated.If follow-up resonant frequency is expanded electromagnetic heating system Improve, the stability of system certainly will be impacted, it is therefore necessary to the voltage of system is carried out stable Effective control.
As shown in Figures 3 and 4, in conjunction with above-mentioned prior art analysis, this programme proposes a kind of good stability Electromagnetic heating control system, can apply to the machine for kitchen use such as electromagnetic oven, IH heating electric rice cooker, described Electromagnetic heating control system includes alternating current power supply 1, and power supply is usually civil power 220V exchange, certainly for adapting to not Can also be other value with area or national standard supply voltage, described electromagnetic heating control system also includes Controller (not marking in figure), filtration module 2, rectification module 3, power component 4, driving module 5 and electricity Pressure control module, in the present embodiment, power component 4 is IGBT, naturally it is also possible to for SPM etc. its Its power device, filtration module 2 can have EMC filter function etc., and rectification module 3 can be full-bridge rectification Can also be Half bridge rectifier, be shown as full-bridge rectification mode in accompanying drawing 3 or accompanying drawing 4 in the present embodiment, this Electromagnetic heating control system described in scheme also includes the Control of Voltage mould making to be input to drive the voltage stabilization of module Block, in the present embodiment, voltage control module is voltage lifting PFC module 6, described voltage lifting PFC module 6 input Connecting rectification module outfan, voltage lifting PFC module 6 outfan connects driving module input.Drive module 5 combinations 52 including resonant element 51, converter unit and switch unit, as the term suggests converter unit and switching The combination 52 of unit includes converter unit 521 and switch unit 522 (as shown in Fig. 5～Fig. 8), this enforcement In example, resonant element is 51 for LC resonant element, and described driving module 5 also includes being connected with power component 4 Drive circuit 53, in the present embodiment, drive circuit 53 is full bridge driving circuit or half-bridge drive circuit.Power Element 4 can be with SPM etc..IGBT in power component 4 i.e. the present embodiment can be one, Being now conventional single pipe controlling system, it is also possible to be half bridge control system (such as Fig. 3), now IGBT's is individual Number is two, and the most corresponding drive circuit 53 is also two.It is of course also possible to be full-bridge control system (as Fig. 4), now IGBT is four, and corresponding drive circuit 53 is also four.Described driving module 5 includes Resonant element 51, in the present embodiment, for LC resonant element, resonant element 51 includes that inductance L is under normal circumstances Solenoid, also includes resonant capacitance, the under normal circumstances resonant inductance of LC resonant element and resonant capacitance string Connection, drives module also to include converter unit and switch unit combination 52 in this programme, as the term suggests converter unit And switch unit combination 52 includes the combination of converter unit 521 and switch unit 522, described switch unit 522 Switching converter unit 521 and LC resonant element syntagmatic adapt to not to change the resonant frequency driving module 5 Heat with material pan.Such as, if Fig. 5 is when switch unit S522 closes, now converter unit 521 (being now independent electric capacity) non-cut-in operation circuit, driving module now includes LC resonant element, this Time can realize irony or the heating of rustless steel pan, when switch unit S522 disconnects, now frequency conversion list Unit's 521 cut-in operation circuit, driving module now includes LC resonant element and converter unit 521, frequency conversion The access of unit 521, adds the resonant frequency of system, now can reach aluminum pot pan or other material pan The resonance range of tool, it is achieved aluminum pot material is heated or other need the material pan of high-frequency resonant to heat, Can certainly realize needing the material pan of low-frequency resonant to heat by reducing resonant frequency.By Electromagnetic Heating The resonant frequency equation frequency of system is:Understand, reduce resonant capacitance or resonant inductance or both All reduce, then the resonant frequency of elevation system, otherwise increase resonant capacitance or resonant inductance or both increase The then resonant frequency of elevation system.Under normal circumstances, from physics's philosophy general knowledge, parallel way Value reduces, and series system value then increases.Converter unit described in the present embodiment can include a resonance Electric capacity or multiple resonant capacitance combinational circuit, multiple resonant capacitance connected modes can be series, parallel and string Parallel combination.Now due to switching change and the change of load of resonant frequency in TV heating control system The unstability of meeting system, therefore control effectively for the input voltage of driving module 5 in system and just has Necessary meaning, this is also one of this programme inventive point practical problem of giving to solve.
Certainly for coordinating above-mentioned frequency conversion to realize the system integrity of unlike material pan heating, described Electromagnetic Heating Control system also includes pan type detection module (not marking in figure), and described pan type detection module detects The material type of pan by corresponding signal transmission controller, controller is described by controlling after obtaining signal The on off operating mode of switch unit 522, and then change the syntagmatic of converter unit 521 and LC resonant element, Realize the resonant frequency matched with the resonant parameter required by pan, to start corresponding resonant frequency to pot Tool heats.
Described switch unit 522 includes the controllable electronic switch device connected in series or in parallel with converter unit 521 Part, described controllable electronic switch device is relay or A.C. contactor or semiconductor switch.Switching controllable electric Sub-switching device on off operating mode is to change converter unit 522 and LC resonant element syntagmatic, and then changes system The resonant frequency of system.In the present embodiment, controllable electronic switch device is relay, by controller to relay Control can realize the break-make of relay and control, and then change converter unit 521 and combine with LC resonant element Relation, and then change the resonant frequency of system.
For solving the main technical point of this programme, strengthen the overall performance of system, mainly propose described in this programme What electromagnetic heating control system included makes to be input to the voltage control module of the voltage stabilization of driving module 5, In the present embodiment, voltage control module is voltage lifting PFC module 6, and described voltage lifting PFC module 6 input connects Rectification module 3 outfan, voltage lifting PFC module 6 outfan connects driving module 5 input.Such as, high Again and again rate booster tension, Frequency heating relative reduction voltage, use pfc circuit to have the following effects or good Place:
One: traditional makes input from 220V AC network by the method for non-control rectification acquisition DC voltage Current waveform generation Severe distortion, containing substantial amounts of harmonic components.Not only radiation interference is serious, and circuit Power factor be generally only capable of reaching 0.5～about 0.7；Add voltage lifting PFC module 6 can realize power because of The correction of number makes electrical network input current waveform perfect tracking electrical network input voltage waveform so that input current waveform For sinusoidal wave and and voltage waveform same phase.In the ideal case, it can be one by the load equivalent of commutator Pure resistance, PF value now is 1.
Its two: voltage lifting PFC module 6 can also have to promote and drives module voltage the effect that stabilizes it, Between voltage 220V～350V that rectification module 3 is exported, can be by PFC boost technology for driving module Thering is provided the stabilized power source of 310Vdc～450Vdc, now PFC module is for driving the input of module 5 burning voltage, The effective power promoting heating system accounts for the accounting of total energy consumption, promotes the efficiency of heating surface and utilization rate of electrical, simultaneously Can effectively reduce the current value of system, such system is more safe and reliable.
Described electromagnetic heating control system also includes the switch module (figure for switching voltage control module 6 break-make In do not mark), switching switch module on off operating mode adds accessing or to exit described electromagnetism by voltage control module 6 Thermal control system.Such as in the case of normal condition is good (system stability good and load calm dynamic in the case of, Voltage control module 6 can be logged off, the most energy-conservation, it is the most in most cases stable Performance boost system effectiveness switching switch module on off operating mode adds so that voltage control module 6 is accessed described electromagnetism Thermal control system).
The workflow of concrete control system is, certainly this flow process order in no particular order, when after system electrification, Power supply carries out transformation process through transformator to power supply, may also filter permissible through EMC filtration module For module or individually filter components and parts, by the rectification of over commutation bridge heap, power supply signal is carried out rectification process Rear entrance voltage lifting PFC module 6, voltage lifting PFC module 6 one aspect realizes the correction of the power factor of circuit, Make input drive the voltage of module to keep stable simultaneously, there is boosting pressure stabilization function so that follow-up electricity simultaneously The stable high value at applicable circuit of pressure, so, in the case of whole system power is certain, can by P=IU Knowing, after voltage raises, the electric current of circuit system can reduce, and current reduction promotes the stability in the large of circuit, Protect components and parts the most further.The material of pan is detected by pan type detection module before this Feeding back to controller, controller can start the resonant frequency matched with pan according to pan type, then Drive corresponding inverter circuit, open IGBT and realize the heating to pan.Native system adapts to iron pan (no Rust steel pan) sensing heating resonant frequency range be between 15KHz～50KHz, optimal frequency scope is Between 20KHz～30KHz；Adapt to aluminum pot sensing heating resonant frequency range be 50KHz～100KHz it Between, optimal frequency scope is 50KHz～80KHz.This resonant frequency can according to the inductance value of drum (according to Induction area, efficiency, power parameter) it is designed and debugs.
Such as Figure 10, for utilizing the present embodiment experiment test figure, pan used is aluminum pot pan, uses full-bridge control System processed, heating 1000W utilizes oscillograph test capture waveform.(wherein test pencil 1 (waveform 1) is ARM IGBT drive pin waveform, test pencil 2 (waveform 2) is lower brachium pontis b, e two ends waveforms, test pencil 3 (ripple Shape 3) resonance potential at one of them resonant capacitance two ends, test pencil 4 (waveform 4) is drum current waveform) Substantially it can be seen that the resonance potential at test pencil 3 resonant capacitance two ends and the string shape of test pencil 4 drum electric current from figure Function, can be seen that in figure that drum current amplitude is 38A, and thus program system can achieve aluminum pot pan Heat, simultaneously because the stability adding whole waveform and system of voltage lifting PFC module 6 effectively promotes.
Specific embodiment two:
As shown in Figure 6, in the present embodiment, change inductance value is used to realize the control of resonant frequency, by with humorous The decision formula of vibration frequency understands change resonant inductance can also realize the change of resonant frequency, so this programme Use independent change inductively to go to realize the change of system frequency, described converter unit can include one humorous Shake inductance or multiple resonant inductance combinational circuit, multiple resonant inductance connected modes can be series, parallel and Connection in series-parallel is combined.
It is embodied as three:
As it is shown in fig. 7, in the present embodiment, use change resonant capacitance jointly to realize resonant frequency with inductance value Control, now resonant inductance and resonant capacitance are in parallel with controllable electronic switch device S after using and connecting, institute State converter unit and can also include a resonant capacitance and the combinational circuit of a resonant inductance, it is also possible to for many Individual resonant capacitance and the combinational circuit of multiple resonant inductances, connected mode can be in parallel.
Specific embodiment four:
As shown in Figure 8, the present embodiment is different from specific embodiment three is that resonant inductance is adopted with resonant capacitance With in parallel with controllable electronic switch device S after series connection, described converter unit can also include a resonant capacitance Combinational circuit with a resonant inductance, it is also possible to for the group of connecting of multiple resonant capacitances with multiple resonant inductances Close circuit.
It is embodied as five:
Certainly, as it is shown in figure 9, resonant inductance has a lot of such as inductance with the combination connecting mode of resonant capacitance Inductively or capacitively connect with other independent one again with after electric capacity parallel connection, or two inductance are in parallel with electric capacity After be serially connected again, further, the present embodiment to write controllable electronic switch device S in parallel with converter unit more Situation, naturally it is also possible to for being connected in series of satisfied design, do not repeat them here.
This programme proposes a kind of stable electromagnetic heating control system, including controller, filtration module, rectification Module, power component and the driving module being connected with power component, described electromagnetic heating control system also includes So that being input to drive the voltage control module of the voltage stabilization of module, voltage control module being set and makes input Being stablized to the voltage driving module, the circuit stability for subsequent drive module is promoted, Jin Erti Rise the stability of whole system.Further scheme, described voltage control module includes boosting unit, described Boosting unit input connects rectification module, and described boosting unit outfan connects driving module input, with Will enter into and drive the voltage of module to carry out boosting rectifier control.In the case of boosting rectifier control equal-wattage, can be effective Reduce system power, components and parts and circuit are all played a good protection.Described voltage control module bag Including PFC unit, described PFC unit input connects rectification module, and the connection of described PFC unit outfan is driven Dynamic module input, is input to driving module with after the voltage stabilization that export by rectification module.Further side Case, described PFC unit is voltage lifting PFC unit, and described voltage lifting PFC unit input voltage is 220～350V, Output voltage is 310V～450V.Combined with capability correction by boosting, it is achieved carrying of power factor Rise, promote efficiency of heating surface new-added item system stability simultaneously.Described driving module includes resonant element, frequency conversion list Unit and switch unit, switch described switch unit to change converter unit and resonant element syntagmatic.Described Switch unit includes the controllable electronic switch device connected in series or in parallel with converter unit, switches controlled electron Switching device on off operating mode is to change converter unit and resonant element syntagmatic, and then changes Electromagnetic Heating control The resonant frequency of system processed.Described controllable electronic switch device is relay or A.C. contactor or quasiconductor is opened Close.The application that frequency-variable module can change the different occasion of resonant frequency adaptation of system is set, embodies simultaneously Voltage-controlled module is to necessity in such cases.
1. a stable electromagnetic heating control system, including controller, filtration module, rectification module, power unit Part and the driving module being connected with power component, it is characterised in that: described electromagnetic heating control system also wraps Include so that being input to drive the voltage control module of the voltage stabilization of module.
2. electromagnetic heating control system as claimed in claim 1, it is characterised in that: described voltage control module bag Including boosting unit, described boosting unit input connects rectification module, and described boosting unit outfan connects Drive module input, with will enter into drive module voltage carry out boosting rectifier control.
3. electromagnetic heating control system as claimed in claim 1, it is characterised in that: described voltage control module bag Including PFC unit, described PFC unit input connects rectification module, and described PFC unit outfan is even Connect driving module input, to be input to after the voltage stabilization that exported by rectification module drive module.
4. electromagnetic heating control system as claimed in claim 3, it is characterised in that: described PFC unit is boosting PFC unit, described voltage lifting PFC unit input voltage is 220～350V, and output voltage is 310V～450V.
5. the electromagnetic heating control system as described in one of Claims 1 to 4, it is characterised in that: described electromagnetism adds Thermal control system also includes that the switch module for switching voltage control module break-make, switching switch module lead to Disconnected state is to access voltage control module or to exit described electromagnetic heating control system.
6. the electromagnetic heating control system as described in one of Claims 1 to 4, it is characterised in that: described driving mould Block includes resonant element, converter unit and switch unit, switches described switch unit to change converter unit With resonant element syntagmatic.
7. electromagnetic heating control system as claimed in claim 6, it is characterised in that: described switch unit include with The controllable electronic switch device that converter unit is connected in series or in parallel, switches controllable electronic switch device break-make State is to change converter unit and resonant element syntagmatic, and then changes the humorous of electromagnetic heating control system Vibration frequency.
8. electromagnetic heating control system as claimed in claim 7, it is characterised in that: described controllable electronic switch device Part is relay or A.C. contactor or semiconductor switch.
9. the electromagnetic heating control system as described in one of Claims 1 to 4, it is characterised in that: described power unit Part is IGBT, and described driving module also includes the drive circuit being connected with IGBT.
10. electromagnetic heating control system as claimed in claim 9, it is characterised in that: described drive circuit is The single tube drive circuit being connected with IGBT；Or described drive circuit is the half-bridge driven being connected with IGBT Circuit；Or described drive circuit is the full bridge driving circuit being connected with IGBT.
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Cited By (1)
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|CN108371471A (en) *||2017-09-15||2018-08-07||九阳股份有限公司||Electromagnetic heating electric rice cooker and its cooking methods|
- 2016-05-04 CN CN201620395209.7U patent/CN205726494U/en active Active
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|CN108371471A (en) *||2017-09-15||2018-08-07||九阳股份有限公司||Electromagnetic heating electric rice cooker and its cooking methods|
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|C14||Grant of patent or utility model|