CN102984837B - Energy-saving multifrequency electromagnetic induction heating device - Google Patents
Energy-saving multifrequency electromagnetic induction heating device Download PDFInfo
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- CN102984837B CN102984837B CN201210527103.4A CN201210527103A CN102984837B CN 102984837 B CN102984837 B CN 102984837B CN 201210527103 A CN201210527103 A CN 201210527103A CN 102984837 B CN102984837 B CN 102984837B
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Abstract
The invention relates to a heating device, in particular to an energy-saving multifrequency electromagnetic induction heating device. The heating device comprises a controller, a resonant module and an input/output module, wherein the controller is connected with a rectification and filtration module for rectifying and filtering input current, and a detection and protection module for detecting and protecting voltage of the input current; the resonant module is used for generating a magnetic field and acts with a cooker bottom to generate heat; the resonant module is connected with a load detection module which quickly detects the material variation and the distance variation of a cooker; the load detection module is connected with a modulation module for adjusting an output frequency and a phase of the resonant module; and the modulation module is connected with the controller. According to the heating device, the load condition and the distance between the cooker bottom and the resonant module are detected in real time; the output frequency and the phase of a circuit are modulated dynamically in real time; the resonant module operates in an inductive area all the time; the damage caused by overcurrent due to the load variation is avoided; the output of useless power can be reduced; and the effects of energy conservation and consumption reduction are exerted.
Description
Technical field
The present invention relates to a kind of heater, especially a kind of energy-conservation multiple frequency type electromagnetic induction heater.
Background technology
Conventional commercial kitchen kitchen tools still be take the combustion gas, oil range of naked light as main.Along with the development high-power commercial electromagnetic stove of kitchen range technology is a kind of energy-efficient kitchen tools, substitute traditional naked-fire stove mode of heating, directly in the bottom of a pan, produce heat, the heat efficiency is greatly improved.Its operation principle is: by rectification circuit, alternating voltage is become to direct voltage, pass through again LC oscillating circuit and IGBT control circuit, convert direct voltage to high frequency voltage, make the electric current changing at a high speed flow through the heating coil disc coil of electromagnetic oven and produce the magnetic field changing at a high speed, when the magnetic force in magnetic field passes through containing irony pot bottom, can produce countless little eddy current, make pot body heating at a high speed voluntarily itself, and then calorify a pot interior food.
Yet, when commercial induction cooker is used for commercial use cooking, for making to heat food in pan, be heated evenly, need to throw up and down pot.And pan moves up and down or pan material temperature accelerates, all can cause the variation of inductance value in LC resonant circuit, thereby affect LC resonance frequency, when IGBT driving frequency and LC resonance frequency change while approaching, LC resonant circuit is close to resistive district, and electric current can be uprushed.Thereby cause circuit overcurrent and damage.
Summary of the invention
The invention provides a kind of throwing pot up and down of can realizing makes food be heated evenly, can prevent again that circuit is due to the frequent pot energy-conservation multiple frequency type electromagnetic induction heater damaging of throwing.
To achieve these goals, the present invention adopts following technical scheme:
It comprises a controller, described controller is connected with for input current being carried out to the rectification filtering module of rectifying and wave-filtering, the detection protection module that the current/voltage of input is detected and protected, resonance modules for generation of magnetic field and the bottom of a pan effect generation heat, and input/output module, its improvement is: described resonance modules connects the load detecting module of a fast detecting pan material variation and change of distance, described load detecting module connects one and adjusts the output frequency of resonance modules and the modulation module of phase place, described modulation module is connected with controller, described modulation module comprises a PWM modulation circuit being connected with load detecting circuit and the IGBT driver element being connected with PWM modulation circuit, IGBT driver element connects resonance modules, described resonance modules comprises an IGBT switch, absorption circuit, resonant capacitance and with IGBT switch, absorption circuit, the resonance coil that resonant capacitance connects.
Preferably, described load detecting module comprises a high-frequency mutual inductor being connected with resonance modules and the load detecting circuit being connected with high-frequency mutual inductor.
Preferably, described PWM modulation circuit is also connected with current foldback circuit and phase lock circuitry.
Preferably, described high-frequency mutual inductor is connected with resonance coil.
Preferably, described rectification filtering module comprises that the three-phase inlet wire once connecting suppresses circuit unit, three phase rectifier unit and filter unit.
Preferably, described detection protection module comprises voltage surge protected location, current detecting unit, voltage detection unit, IGBT temperature detecting unit, the drum temperature detecting unit being connected with controller respectively.
Preferably, described input/output module comprises demonstration output unit, control inputs unit, cooling fan control unit and the switch control unit being connected with controller respectively.
Owing to having adopted said structure, energy-conservation multiple frequency type electromagnetic induction heater of the present invention is by the real-time detection load state of load detecting module, and the distance of the bottom of a pan and resonance modules, according to testing result, the in real time dynamic modulation circuit output frequency of modulation module and phase place, by rectification filtering module, the conversion of frequency of supply is realized the automatic adjusting of running speed rate, make resonance modules work in perceptual district always, stop that electric current is excessive to be damaged because load variations causes, and can reduce the output of useless power, played energy-saving and cost-reducing effect, during long-term use, can effectively reduce use cost.
Accompanying drawing explanation
Fig. 1 is the general module structural representation of the embodiment of the present invention;
Fig. 2 is the concrete modular structure schematic diagram of the embodiment of the present invention;
Fig. 3 is the load detecting circuit of the embodiment of the present invention and the circuit diagram of PWM modulation circuit.
Embodiment
As shown in Figure 1, the energy-conservation multiple frequency type electromagnetic induction heater of the present embodiment comprises a controller 1, described controller 1 is connected with for input current being carried out to the rectification filtering module 2 of rectifying and wave-filtering, the detection protection module 3 that the current/voltage of input is detected and protected, resonance modules 4 for generation of magnetic field and the bottom of a pan effect generation heat, and input/output module 5, described resonance modules 4 connects the load detecting module 6 of a fast detecting pan material variation and change of distance, described load detecting module 6 connects one and adjusts the output frequency of resonance modules and the modulation module of phase place 7, described modulation module 7 is connected with controller 1.
Concrete, as shown in Figure 2, described load detecting module 6 comprises a high-frequency mutual inductor being connected with resonance modules 61 and the load detecting circuit 62 being connected with high-frequency mutual inductor 61; Described modulation module 7 comprises a PWM modulation circuit 71 being connected with load detecting circuit 62 and the IGBT driver element 72 being connected with PWM modulation circuit 71, and IGBT driver element 72 connects resonance modules 4; Described PWM modulation circuit 7 is also connected with current foldback circuit 73 and phase lock circuitry 74; Described resonance modules 4 comprises an IGBT switch 41, absorption circuit 42, resonant capacitance 43 and the resonance coil 44 being connected with IGBT switch 41, absorption circuit 42, resonant capacitance 43; Described high-frequency mutual inductor 61 is connected with resonance coil 44; Described rectification filtering module 2 comprises that the three-phase inlet wire once connecting suppresses circuit unit 21, three phase rectifier unit 22 and filter unit 23; Described detection protection module 3 comprises voltage surge protected location 31, current detecting unit 32, voltage detection unit 33, IGBT temperature detecting unit 34, the drum temperature detecting unit 35 being connected with controller respectively; Described input/output module 5 comprises demonstration output unit 51, control inputs unit 52, cooling fan control unit 53 and the switch control unit 54 being connected with controller 1 respectively.In the present embodiment; surge protection unit 31, current detecting unit 32, voltage detection unit 33 also connect accessory power supply transforming circuit; be arranged in the circuit part of Fig. 2 lower-left side, thereby control circuit provides power supply, by 220 or 330V isolated from power become several roads low-tension supply.
The present embodiment is when work, and PWM modulation circuit 71 output drive signals cut-off through IGBT driver element 72 isolation amplification control IGBT switches 41, and its driving signal frequency f0 is automatically following resonant circuit frequency f and changing, resonance frequency f=
so the capacitance C of resonance coil 44 inductance value L and resonant capacitance 43 determines resonance frequency f, when the capacitance C of resonance coil 44 inductance value L and resonant capacitance 43 determines, resonance frequency f determines accordingly.
When load pan moves and during changes in material, resonance frequency f changes thereupon, when pan is removed, resonance coil 44 inductance values reduce, and resonance frequency f raises, and when pan is put into, resonance coil 44 inductance values increase, and resonance frequency f reduces.During due to work, the driving signal frequency f0 of PWM modulation circuit 71 is a little more than resonance frequency f, in perceptual district and keep higher-wattage, when the upper and lower fast moving of pan, be that cooking is thrown in pot process and while maintaining power stage, the driving signal frequency f0 of resonance frequency f and PWM modulation circuit 71 approaches, series resonant circuit approaches resonance condition, in resonance coil 44, electric current is uprushed, now, for guaranteeing circuit reliability, the driving signal frequency f0 of PWM modulation circuit 71 raises or reduces along with resonance frequency f changes.
As shown in Figure 3, port INA and INB get respectively high-frequency mutual inductor two ends to specific implementation, take size and the phase angle signal of resonant circuit current value by high-frequency mutual inductor.The high-frequency electrical flow valuve that port INA and INB gather is after rectification, and the size of its value determines Q3 conducting, and Q3 and chip U2 VCO pin are connected, and its Q3 adds that oscillation resistance sum determines chip M2 output frequency.When loaded work piece is in set condition value, high-frequency electrical flow valuve is larger, and Q3 conducting degree is larger, and Q3 internal resistance is less, and its frequency of oscillation is minimum, and power output is maximum; When load moves up, its resonant circuit inductance quantitative change is large, its resonant circuit internal resistance increases (load internal resistance increase), electric current reduces, Q3 conducting reduces, and Q3 internal resistance increases, and M2 output frequency increases accordingly, output frequency and resonant circuit self frequency is consistent, always in perceptual state.
The heater of the present embodiment is by not only having played the object of protection resonant circuit to the adjusting of power output, and output frequency changes the output of regulating power effectively with the variation of resonant circuit frequency, by resonant circuit to electric current incoming frequency carry out inductive load between certain induction zone in, what be directed to boiler frequently throws contact, control load changes and causes the excessive damage of electric current effectively, than original employing, continuing constant relatively high power output compares, the present embodiment pan away from can reduce gradually the power of output, when pan is approaching, increase again the power of output, so can significantly reduce the output of useless power in throwing frequently pot process, played energy-saving and cost-reducing effect, during long-term use, can effectively reduce use cost.
The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (7)
1. an energy-conservation multiple frequency type electromagnetic induction heater, comprise a controller, described controller is connected with for input current being carried out to the rectification filtering module of rectifying and wave-filtering, the detection protection module that the current/voltage of input is detected and protected, resonance modules for generation of magnetic field and the bottom of a pan effect generation heat, and input/output module, it is characterized in that: described resonance modules connects the load detecting module of a fast detecting pan material variation and change of distance, described load detecting module connects one and adjusts the output frequency of resonance modules and the modulation module of phase place, described modulation module is connected with controller, described modulation module comprises a PWM modulation circuit being connected with load detecting circuit and the IGBT driver element being connected with PWM modulation circuit, IGBT driver element connects resonance modules, described resonance modules comprises an IGBT switch, absorption circuit, resonant capacitance and with IGBT switch, absorption circuit, the resonance coil that resonant capacitance connects.
2. energy-conservation multiple frequency type electromagnetic induction heater as claimed in claim 1, is characterized in that: described load detecting module comprises a high-frequency mutual inductor being connected with resonance modules and the load detecting circuit being connected with high-frequency mutual inductor.
3. energy-conservation multiple frequency type electromagnetic induction heater as claimed in claim 2, is characterized in that: described PWM modulation circuit is also connected with current foldback circuit and phase lock circuitry.
4. energy-conservation multiple frequency type electromagnetic induction heater as claimed in claim 3, is characterized in that: described high-frequency mutual inductor is connected with resonance coil.
5. energy-conservation multiple frequency type electromagnetic induction heater as claimed in claim 4, is characterized in that: described rectification filtering module comprises that the three-phase inlet wire once connecting suppresses circuit unit, three phase rectifier unit and filter unit.
6. energy-conservation multiple frequency type electromagnetic induction heater as claimed in claim 5, is characterized in that: described detection protection module comprises voltage surge protected location, current detecting unit, voltage detection unit, IGBT temperature detecting unit, the drum temperature detecting unit being connected with controller respectively.
7. energy-conservation multiple frequency type electromagnetic induction heater as claimed in claim 6, is characterized in that: described input/output module comprises demonstration output unit, control inputs unit, cooling fan control unit and the switch control unit being connected with controller respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210527103.4A CN102984837B (en) | 2012-12-10 | 2012-12-10 | Energy-saving multifrequency electromagnetic induction heating device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210527103.4A CN102984837B (en) | 2012-12-10 | 2012-12-10 | Energy-saving multifrequency electromagnetic induction heating device |
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| CN102984837A CN102984837A (en) | 2013-03-20 |
| CN102984837B true CN102984837B (en) | 2014-07-30 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103687117A (en) * | 2013-10-23 | 2014-03-26 | 北京久顺科技有限公司 | Digital FM (Frequency Modulation) PLL (Phase-locked Loop) half-bridge serial resonance electromagnetic induction heating power supply |
| CN103687116A (en) * | 2013-10-23 | 2014-03-26 | 北京久顺科技有限公司 | Digital FM (Frequency Modulation) PLL (Phase-locked Loop) full-bridge serial resonance electromagnetic induction heating power supply |
| CN104373973B (en) * | 2014-10-30 | 2017-02-01 | 深圳市国创新能源研究院 | Electromagnetic oven and method and device for controlling power of electromagnetic oven |
| CN104619058B (en) * | 2014-12-17 | 2016-04-27 | 北京京仪椿树整流器有限责任公司 | For the induction heating power binary coil method for independently controlling that polycrystalline silicon ingot casting is purified |
| CN104602378B (en) * | 2014-12-26 | 2017-08-15 | 珠海格力电器股份有限公司 | Electromagnetic oven and control method |
| CN104597356B (en) * | 2015-01-30 | 2018-06-19 | 广东美的厨房电器制造有限公司 | For the cookware detection method and detection device of cooking apparatus |
| CN107404778B (en) * | 2016-05-18 | 2020-07-31 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking system and driving control circuit and detection method thereof |
| CN107995712A (en) * | 2017-12-08 | 2018-05-04 | 北京弗圣威尔科技有限公司 | Wireless power heating unit and heating means and placement thing and its preparation method |
| CN109916993B (en) * | 2017-12-12 | 2024-04-09 | 佛山市顺德区美的电热电器制造有限公司 | Detection method, detection device, household appliance and computer readable storage medium |
| CN110613313B (en) * | 2018-06-20 | 2021-07-20 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and over-current control method and control device of IGBT (insulated gate bipolar transistor) of electromagnetic heating cooking utensil |
| GB2582930B (en) * | 2019-04-08 | 2023-01-11 | Edwards Ltd | Induction heating method and apparatus |
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| CN200953667Y (en) * | 2006-03-13 | 2007-09-26 | 邓志雄 | Electromagnetic oven with automatic high voltage and frequency controlled power tube |
| CN201021818Y (en) * | 2007-03-01 | 2008-02-13 | 东莞市前锋电子有限公司 | Circuit device for electromagnetic furnace detection boiler |
| CN202973225U (en) * | 2012-12-10 | 2013-06-05 | 广东澳得科技股份有限公司 | Novel throwable electromagnetic induction heating device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200953667Y (en) * | 2006-03-13 | 2007-09-26 | 邓志雄 | Electromagnetic oven with automatic high voltage and frequency controlled power tube |
| CN201021818Y (en) * | 2007-03-01 | 2008-02-13 | 东莞市前锋电子有限公司 | Circuit device for electromagnetic furnace detection boiler |
| CN202973225U (en) * | 2012-12-10 | 2013-06-05 | 广东澳得科技股份有限公司 | Novel throwable electromagnetic induction heating device |
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Address after: 515300 Puning science and Technology Industrial Zone, Guangdong, Jieyang Patentee after: Guangdong Ao get Science and Technology Ltd. Address before: 515300 Puning science and Technology Industrial Zone, Guangdong, Jieyang Patentee before: Guangdong Aouder Technology Stock Co., Ltd. |
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