CN201001206Y - Electromagnetic furnace circuit for implementing steadily low power heating - Google Patents
Electromagnetic furnace circuit for implementing steadily low power heating Download PDFInfo
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- CN201001206Y CN201001206Y CNU2007201183170U CN200720118317U CN201001206Y CN 201001206 Y CN201001206 Y CN 201001206Y CN U2007201183170 U CNU2007201183170 U CN U2007201183170U CN 200720118317 U CN200720118317 U CN 200720118317U CN 201001206 Y CN201001206 Y CN 201001206Y
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 17
- 230000001105 regulatory effect Effects 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 13
- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 claims description 5
- 101150105073 SCR1 gene Proteins 0.000 claims description 5
- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 1
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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 relates to an electromagnetic oven circuit realizing stable low power heating, which comprises a rectifier filter, a power inversion circuit, and a monolithic integrated circuit, and also a drive circuit, connected between the PPG signal output terminal of the monolithic integrated circuit and the input terminal of the power inversion circuit; a direct current voltage regulation circuit, connected between a rectification bridge output terminal and a filter input terminal, with the control terminal connected with one of the output terminal of the monolithic integrated circuit; and a synchronous signal detecting circuit, with the input terminal thereof connected with an alternating current power supply. The monolithic integrated circuit controls the synchronous switching-on or switching-off, and the proportion between the switching-on time and the switching-off time of the direct current voltage regulation circuit and the power inversion circuit, to realize the continuous and steady work from a low power to a high power. The proposal is provided with novel idea, simple circuit structure, and safe and reliable operation. At the same time of the guarantee of the continuous high power steady work of the electromagnetic oven, steady and continuous low power heating is realized, the output power regulation range of the electromagnetic oven is widened, and the low power output value can achieve 10 percent of the maximum power value or lower.
Description
Technical field
The utility model relates to the electromagnetic oven with electric energy heating, and especially a kind of can the realization stablize the electromagnetic oven circuit that small-power heats, and adopts the electromagnetic oven of this circuit can be from small-power to the high power CW steady operation.
Background technology
The present electromagnetic oven of main flow on the market, it is converted to direct current by bridge rectifier with alternating current, pass through power inversion circuit again, produce high-frequency alternating magnetic field on solenoid, this high-frequency alternating magnetic field finally is converted to heat energy by produce eddy current effect on cooker.
The electromagnetic oven continuous power of main flow output in the market when heating below needs 1/2nd maximum powers, mostly adopts the gap working method to reach between maximum power to two/maximum power.When common electromagnetic oven heats in small-power (as less than 1/2nd maximum powers), can not accomplish the no-voltage conducting, master control IGBT switching loss is very big, the IGBT heating is serious, so can not guarantee simultaneously that small-power heats operate as normal continuously, thereby make the application of electromagnetic oven be subjected to a certain extent restriction.Therefore, guarantee the continuous high-power steady operation of electromagnetic oven, can realize the small-power heating of steady and continuous simultaneously again, be one of problem of studying of insider always.
Summary of the invention
In view of existing electromagnetic oven above shortcomings in actual applications, the utility model provides a kind of electromagnetic oven circuit of realizing the stable heating of small-power, with guarantee electromagnetic oven from small-power (i.e. 1/10th maximum powers or lower) to the high power CW steady operation.
The electromagnetic oven circuit of small-power heating is stablized in realization of the present utility model, comprises rectifier filter, by power inversion circuit and single-chip microcomputer that IGBT pipe and LC resonant tank are formed, also comprises:
A drive circuit is connected between the input of the PPG signal output part of single-chip microcomputer and power inversion circuit, promotes power inversion circuit work to amplify described PPG signal;
A direct voltage regulating circuit, this circuit are connected between rectification bridge output end and the filter input end, and control end connects single-chip microcomputer one output, with the direct voltage of its output of timely adjustment; And,
A synchronization signal detection circuit, input connects AC power, be used to obtain synchronizing signal and send into single-chip microcomputer, by the described direct voltage regulating circuit of Single-chip Controlling with power inversion circuit is opened synchronously or turn-offed and service time and turn-off time ratio, realize from small-power to the high power CW steady operation.
The utlity model has direct voltage regulating circuit and synchronization signal detection circuit, single-chip microcomputer is according to synchronizing signal control direct voltage regulating circuit and power inversion circuit is opened synchronously or turn-offed and service time and turn-off time ratio, reaches the purpose of stable control power output size.When power inversion circuit is opened or is turn-offed, described direct voltage regulating circuit turn-offs, and the direct voltage of its output is zero, makes power inversion circuit open or turn-off under no-voltage, reach and reduce switching loss, make power inversion circuit steady and continuous work under small-power.
This plan plot novelty, circuit structure is simple, and is safe in utilization, reliable.When guaranteeing the continuous high-power steady operation of electromagnetic oven, realized the small-power heating of steady and continuous again, electromagnetic oven can be regulated and steady operation from the small-power to the high power CW, widened the electromagnetic oven output power adjustable range, the small-power output valve can reach 10% maximum power value or lower.
Description of drawings
Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is the utility model exemplary embodiments circuit diagram.
Embodiment
Below in conjunction with implementing illustration the utility model is further specified
The power inversion circuit 4 that the electromagnetic oven circuit that small-power heating is stablized in realization shown in Figure 1 mainly comprises rectifier bridge 1, filter 3, is made up of IGBT pipe and LC resonant tank, and single-chip microcomputer 6, and be provided with especially: drive circuit 5, direct voltage regulating circuit 2 and synchronization signal detection circuit 7.Drive circuit 5 is connected between the PPG signal output part of single-chip microcomputer 6 and the input of power inversion circuit 4 (being the grid of IGBT pipe), promotes power inversion circuit work to amplify described PPG signal.Direct voltage regulating circuit 2 is connected between rectifier bridge 1 output and filter 3 inputs, and control end connects single-chip microcomputer one output, with the direct voltage of its output of timely adjustment.Synchronization signal detection circuit 7 inputs connect AC power, are used to obtain synchronizing signal and send into single-chip microcomputer.Single-chip microcomputer 6 is electromagnetic oven main control parts, control that described direct voltage regulating circuit and power inversion circuit are opened synchronously or turn-off synchronously and service time and turn-off time ratio, the realization electromagnetic oven from small-power to the high power CW steady operation.
When power inversion circuit was opened or turn-offed, described direct voltage regulating circuit turn-offed, and the direct voltage of its output is zero, makes power inversion circuit open or turn-off under no-voltage, reached to reduce switching loss, made IGBT steady and continuous work under small-power.When power inversion circuit was opened, the direct voltage regulating circuit turn-offs and to make the direct voltage that is applied to power inversion circuit was zero, and and then the opening progressively to strengthen from zero degree and open angle of IGBT controlled the noise that switch causes so again.
Fig. 2 is the utility model exemplary embodiments circuit diagram.Wherein, rectifier bridge 1, filter 3 and power inversion circuit 4 can adopt custom circuit, power inversion circuit 4 is made up of IGBT pipe and LC resonant tank, and the LC resonant tank is connected between the output of the collector electrode of IGBT pipe and filter, and resonant inductance is arranged in the heating plate of electromagnetic oven.
Synchronization signal detection circuit 7 is by triode Q1, form with its collector resistance R1 and base resistance R2, and the Q1 base stage connects AC power by R2.This circuit is a zero cross detection circuit, and it detects the zero cross signal of 50Hz AC power, offers single-chip microcomputer 6 (IC1) as synchronous control signal.
Drive circuit 5 is by triode Q4, Q5, Q6, capacitor C 3 and resistance R 8, R9 form, the Q4 collector electrode connects power positive end by R9, base stage connects power positive end by R8, the base stage of Q5, Q6 connects the Q4 collector electrode, the Q5 collector electrode connects power positive end, the collector electrode of Q6 and the grounded emitter of Q4, the emitter of Q5, Q6 connects as output, this output connects the IGBT1 tube grid by current limliting R10, between IGBT1 tube grid and the emitter and meet voltage-stabiliser tube DW1 and R11, what the base stage of Q4 was accepted the PPG proportional control of single-chip microcomputer 6 and Millisecond opens/turn-offs gap work control.
Direct voltage regulating circuit 2 comprises: controllable silicon SCR 1, triode Q2, Q3, and resistance R 3, R4, R5, R6, R7, the emitter of Q2 connects the anode of controllable silicon SCR 1, the collector electrode of Q2 connects the trigger end of SCR1 by resistance R 6, be connected R7 between Q2 base stage and the emitter, the Q2 base stage connects the collector electrode of Q3 by R5, the Q3 grounded emitter, R4 is connected between Q3 base stage and the emitter, the Q3 base stage connects single-chip microcomputer one lead-out terminal by resistance R 3, under the coordination control of single-chip microcomputer (IC1), cooperates power IGBT pipe to open or turn-off control under no-voltage.Also comprise conventional current detection circuit and voltage detecting circuit among Fig. 2, current detection circuit and voltage detecting circuit output connect the respective input of single-chip microcomputer 1 respectively.
There are PPG module, synchronous detection module, zero passage detection module, current/voltage detection module, power calculation and control module etc. in single-chip microcomputer 1 (IC1) inside, the major function of this single-chip microcomputer is to accept operator's instruction, makes power inversion circuit and the work of direct voltage regulating circuit matching coordinative by drive circuit.
Single-chip microcomputer recognizes synchronous control signal, by working in coordination to IGBT pipe and direct voltage regulating circuit, opening synchronously or shutoff synchronously of power controlling inverter circuit, regulate the time scale that power output is opened and closed, service time ratio greatly then power output is big, the little then power output of service time ratio is little.
Synchronization signal detection circuit per 20 milliseconds output a pulse signal, the cycle is T=20ms, this pulse signal enters the T0 mouth of single-chip microcomputer, single-chip microcomputer this pulse signal trailing edge as synchronizing signal.From detecting the 1st pulse trailing edge signal moment, Single-chip Controlling direct voltage regulating circuit and drive circuit are opened power output, power requirement according to user's setting, automatically control this power service time Ton, Ton finishes just to turn-off the IGBT pipe and stops power output, is power turn-off time Toff from the time (as the 5th pulse trailing edge signal) of turn-offing starting power output next time.In this process, Ton+Toff=80ms.
During Ton, the PB0 pin of single-chip microcomputer output high level makes the SCR1 conducting by triode Q3, Q2, and the PPG pin of single-chip microcomputer is exported the fixedly PPG signal between the 20KHz-38KHz continuously; During Toff, the PB0 pin output low level of single-chip microcomputer makes SCR1 close, thereby stops power output.Begin up to the 5th pulse trailing edge signal, starting power output once more repeats said process, by adjusting the length adjustment power of Ton time, realizes that the following continuous low power of 1000W adds thermal control.
When the above power of 1000W was controlled continuously, Single-chip Controlling PB0 exported high level, makes SCR1 conducting always, by regulating the frequency of above-mentioned PPG signal, increase the time of the each conducting of IGBT, change the resonance frequency of LC vibration simultaneously, thereby realize that the above continuous power of 1000W adds thermal control.
Aforesaid way efficiently solves the IGBT heating serious problems that common electromagnetic oven occurs when small-power heats, realized that electromagnetic oven is from being lower than 50W to being higher than continuous power output the 2000W.
Claims (3)
1, a kind of electromagnetic oven circuit of realizing stablizing the small-power heating comprises rectifier filter, power inversion circuit and single-chip microcomputer, it is characterized in that also comprising:
A drive circuit is connected between the input of the PPG signal output part of single-chip microcomputer and power inversion circuit, promotes power inversion circuit work to amplify described PPG signal;
A direct voltage regulating circuit, this circuit are connected between rectification bridge output end and the filter input end, and control end connects single-chip microcomputer one output; And,
A synchronization signal detection circuit, input connects AC power, be used to obtain synchronizing signal and send into single-chip microcomputer, by the described direct voltage regulating circuit of Single-chip Controlling with power inversion circuit is opened synchronously or turn-offed and service time and turn-off time ratio, realize from small-power to the high power CW steady operation.
2, stablize the electromagnetic oven circuit of small-power heating according to the realization of claim 1, it is characterized in that: the frequency of the PPG signal of described single-chip microcomputer output is 20-38KHz.
3, stablize the electromagnetic oven circuit of small-power heating according to the realization of claim 1, it is characterized in that described direct voltage regulating circuit comprises: controllable silicon SCR 1, triode Q2, Q3, and resistance R 3, R4, R5, R6, R7, the emitter of Q2 connects the anode of controllable silicon SCR 1, the collector electrode of Q2 connects the trigger end of SCR1 by resistance R 6, be connected R7 between Q2 base stage and the emitter, the Q2 base stage connects the collector electrode of Q3 by R5, the Q3 grounded emitter, R4 is connected between Q3 base stage and the emitter, and the Q3 base stage connects single-chip microcomputer one lead-out terminal by resistance R 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201183170U CN201001206Y (en) | 2007-01-29 | 2007-01-29 | Electromagnetic furnace circuit for implementing steadily low power heating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201183170U CN201001206Y (en) | 2007-01-29 | 2007-01-29 | Electromagnetic furnace circuit for implementing steadily low power heating |
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| CN201001206Y true CN201001206Y (en) | 2008-01-02 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010066097A1 (en) * | 2008-12-12 | 2010-06-17 | 深圳市鑫汇科科技有限公司 | Electromagnetic oven circuit based on soc chip |
| CN101888169A (en) * | 2010-06-24 | 2010-11-17 | 郭士军 | Zero-passage self-excited synchronous trigger circuit of half-bridge driving electromagnetic range |
| WO2011003301A1 (en) * | 2009-07-07 | 2011-01-13 | 深圳市鑫汇科科技有限公司 | Digital control type power converter for cooking utensils |
| CN102252355A (en) * | 2011-08-05 | 2011-11-23 | 美的集团有限公司 | Control method for continuous low-power heating of induction cooker |
| CN102685954A (en) * | 2012-05-20 | 2012-09-19 | 黄文武 | Domestic induction cooker |
| CN103916997A (en) * | 2013-01-05 | 2014-07-09 | 美的集团股份有限公司 | Electromagnetic induction heating device and control method thereof |
| CN105050220A (en) * | 2015-08-18 | 2015-11-11 | 安徽日正新源电气技术有限公司 | A control circuit for an energy-saving coil of an electromagnetic power switch |
| CN106358328A (en) * | 2016-10-18 | 2017-01-25 | 华南理工大学 | Soft switch detection and temperature control method of induction cooker |
| CN106765361A (en) * | 2017-03-27 | 2017-05-31 | 徐士刚 | A kind of intelligent electromagnetic oven |
| CN106895451A (en) * | 2015-12-02 | 2017-06-27 | E.G.O.电气设备制造股份有限公司 | Method for operating electromagnetic oven |
| EP3297396A4 (en) * | 2016-02-02 | 2018-08-29 | Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co., Limited | Electromagnetic heating device and heating control circuit thereof, and low power heating control method |
| CN110366283A (en) * | 2018-04-11 | 2019-10-22 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and its Poewr control method and device |
| CN110493904A (en) * | 2018-05-14 | 2019-11-22 | 深圳市鑫汇科股份有限公司 | A kind of electromagnetic induction heating control method and electromagnetic heating apparatus |
-
2007
- 2007-01-29 CN CNU2007201183170U patent/CN201001206Y/en not_active Expired - Fee Related
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010066097A1 (en) * | 2008-12-12 | 2010-06-17 | 深圳市鑫汇科科技有限公司 | Electromagnetic oven circuit based on soc chip |
| WO2011003301A1 (en) * | 2009-07-07 | 2011-01-13 | 深圳市鑫汇科科技有限公司 | Digital control type power converter for cooking utensils |
| CN101888169A (en) * | 2010-06-24 | 2010-11-17 | 郭士军 | Zero-passage self-excited synchronous trigger circuit of half-bridge driving electromagnetic range |
| CN101888169B (en) * | 2010-06-24 | 2013-12-04 | 深圳市海一电器有限公司 | Zero-passage self-excited synchronous trigger circuit of half-bridge driving electromagnetic range |
| CN102252355A (en) * | 2011-08-05 | 2011-11-23 | 美的集团有限公司 | Control method for continuous low-power heating of induction cooker |
| CN102685954A (en) * | 2012-05-20 | 2012-09-19 | 黄文武 | Domestic induction cooker |
| CN103916997B (en) * | 2013-01-05 | 2016-02-10 | 美的集团股份有限公司 | Electromagnetic induction heater and control method thereof |
| CN103916997A (en) * | 2013-01-05 | 2014-07-09 | 美的集团股份有限公司 | Electromagnetic induction heating device and control method thereof |
| CN105050220A (en) * | 2015-08-18 | 2015-11-11 | 安徽日正新源电气技术有限公司 | A control circuit for an energy-saving coil of an electromagnetic power switch |
| CN106895451A (en) * | 2015-12-02 | 2017-06-27 | E.G.O.电气设备制造股份有限公司 | Method for operating electromagnetic oven |
| US10595366B2 (en) | 2015-12-02 | 2020-03-17 | E.G.O. Elektro-Geraetebau Gmbh | Method for operating an induction hob |
| CN106895451B (en) * | 2015-12-02 | 2021-08-06 | E.G.O.电气设备制造股份有限公司 | Method for operating an induction hob |
| EP3297396A4 (en) * | 2016-02-02 | 2018-08-29 | Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co., Limited | Electromagnetic heating device and heating control circuit thereof, and low power heating control method |
| CN106358328A (en) * | 2016-10-18 | 2017-01-25 | 华南理工大学 | Soft switch detection and temperature control method of induction cooker |
| CN106765361A (en) * | 2017-03-27 | 2017-05-31 | 徐士刚 | A kind of intelligent electromagnetic oven |
| CN110366283A (en) * | 2018-04-11 | 2019-10-22 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and its Poewr control method and device |
| CN110366283B (en) * | 2018-04-11 | 2022-04-19 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and power control method and device thereof |
| CN110493904A (en) * | 2018-05-14 | 2019-11-22 | 深圳市鑫汇科股份有限公司 | A kind of electromagnetic induction heating control method and electromagnetic heating apparatus |
| CN110493904B (en) * | 2018-05-14 | 2021-07-30 | 深圳市鑫汇科股份有限公司 | Electromagnetic induction heating control method and electromagnetic heating equipment |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080102 Termination date: 20130129 |