CN101977455B - Starting method of parallel single pipe type electromagnetic oven - Google Patents
Starting method of parallel single pipe type electromagnetic oven Download PDFInfo
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- CN101977455B CN101977455B CN 201010272842 CN201010272842A CN101977455B CN 101977455 B CN101977455 B CN 101977455B CN 201010272842 CN201010272842 CN 201010272842 CN 201010272842 A CN201010272842 A CN 201010272842A CN 101977455 B CN101977455 B CN 101977455B
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Abstract
The invention relates to an electromagnetic oven starting method based on a control circuit of a parallel single pipe type electromagnetic oven, which comprises the following steps: when a resonance circuit starts to oscillate, a central processing unit outputs IGBT switching-on signals and is subject to a time delay after IGBT switching-on, subsequently outputs IGBT switching-off signals and is subject to a time delay, and then outputs IGBT switching-on signals for the second time to switch on IGBT and conduct the whole control circuit so as to start the electromagnetic oven, wherein the time delay of the first IGBT switching-on is less than 2 muS, and the time delay of the first IGBT switching-off is less than 1.5 muS. Based on the fact that a capacitor gives a heavy discharging current to IGBT when the IGBT is switched on and overtime discharge can easily cause damage to the IGBT because the voltage at the right side of the capacitor C is the voltage of commercial power subject to voltage commutation when the resonance circuit of the electromagnetic oven starts to oscillate in the prior art, the invention enables the resonant capacitor to effectively discharge and reduces the switching-on current acting on the IGBT by using the starting method of transitorily switching on, switching off and then switching on again, thereby obviously improving the service life of the IGBT and the perfection degree of the complete machine.
Description
Technical field
The present invention relates to a kind of universal induction cooker, refer to especially a kind of delayed startup method of parallel single pipe type electromagnetic oven.
Background technology
Electromagnetic oven has the household kitchen electric appliance of quick heating, heat efficiency height, the flames of anger, smoke dust,, good looking appearance little, safe without pernicious gas and volume, has become one of indispensable cooking apparatus of many families.Adopt the principle of heating of magnetic field induction electric current during electromagnetic oven work, by the electronic circuit board part produce alternating magnetic field, when when containing irony pan bottom placement boiler face, pan namely cuts the alternation magnetic line of force and partly produces the electric current (being eddy current) of alternation in the pan bottom metal, eddy current makes the random motion of pan iron molecule high speed, and molecule runs foul of each other, rubs and produces heat energy; Its electronic circuit partly comprises power amplifier board, motherboard, lamp plate, coil panel and temperature-sensitive support, fan etc.Wherein, the Main Function of the IGBT insulated gate bipolar transistor on the power amplifier board provides a square-wave signal and drives the inductance coil dish, and the IGBT in the practicality is generally single and cooperates with the capacitance-resistance resonance circuit, i.e. so-called parallel single pipe type.As seen, IGBT must tolerate the irregular impact of large electric current as a switching tube in when start, and be greatly affected and have influence on machine life its useful life.How to protect and become IGBT and the service life of improving IGBT important research topic in the electromagnetism industry.
Summary of the invention
The problem that the present invention need solve provides a kind of technical scheme that can effectively realize the protection to IGBT, improve the parallel single pipe type electromagnetic oven starting method in IGBT life-span.
According to the above-mentioned Design of Problems that need to solve a kind of starting method of parallel single pipe type electromagnetic oven, the method is take the control circuit of parallel single pipe type electromagnetic oven as the basis, described control circuit comprises power circuit, power circuit and the drive circuit that connects successively, described power circuit is comprised of the resonant circuit, the switching tube IGBT that mutually sequentially connect, steps of the method are
When the resonant circuit starting of oscillation, at first open the IGBT signal by CPU output, for the first time open IGBT and after the time of delaying time, output is turn-offed the IGBT signal and after the time of delaying time, for the second time output is opened the IGBT signal and IGBT is opened and the whole control circuit of conducting again, and then starts electromagnetic oven.In whole process, the time-delay after IGBT opens for the first time is less than 2 μ S, and then the time-delay that is turned off for the first time of IGBT is less than 1.5 μ S.
The present invention is based in the prior art electromagnetic oven when the resonant circuit starting of oscillation, because the voltage on capacitor C right side equals the voltage after the line voltage rectification, electric capacity was very large to the IGBT discharging current when IGBT opened, overlong time causes IGBT to damage easily, so borrow the of short duration open method of opening, turn-off, opening again, resonant capacitance is effectively discharged, reduced the electric current of opening that IGBT must bear, can significantly improve useful life and the complete machine serviceability rate of IGBT.
Description of drawings
Accompanying drawing 1 is start steps flow chart schematic diagram of the present invention; Accompanying drawing 2 is circuit theory schematic diagrames of electromagnetic oven involved in the present invention.
Embodiment
Purport of the present invention is to be the Kai Heguan of short interruption by time-delay, discharges the start discharging current that resonant capacitance produces, and reduces discharging current to the impact of switching tube IGBT with this, reduces the loss to IGBT, improves IGBT and machine life.The invention will be further described with reference to the accompanying drawings.
Fig. 2 provided the present invention based on the circuit theory schematic diagram of existing commercially available electromagnetic oven, i.e. the control circuit of electromagnetic oven.This control circuit comprises power circuit, power circuit and the drive circuit that connects successively, and described power circuit is comprised of the resonant circuit, the switching tube IGBT that mutually sequentially connect.Because circuit shown in the figure be the universal circuit of routine, so followingly only make an explanation with regard to power circuit involved in the present invention.
Are connected with capacitor C by inductance L 2 and are connected with power circuit, are connected with switching tube IGBT1 afterwards before the resonant circuit that forms, the base stage of IGBT1 links to each other with central processing element.
Main points of the present invention are to have changed the enabling signal way of output of central die in the control circuit, have namely changed the starting method of electromagnetic oven.Starting method of the present invention is (with reference to Fig. 1), when the resonant circuit starting of oscillation, at first open the IGBT signal by CPU output, for the first time open IGBT and after the time of delaying time, output is turn-offed the IGBT signal and after the time of delaying time, for the second time output is opened the IGBT signal and IGBT is opened and the whole control circuit of conducting again, and then starts electromagnetic oven.In whole process, the time-delay after IGBT opens for the first time is less than 2 μ S, and then the time-delay that is turned off for the first time of IGBT is less than 1.5 μ S.
Claims (3)
1. the starting method of a parallel single pipe type electromagnetic oven, the method is take the control circuit of parallel single pipe type electromagnetic oven as the basis, described control circuit comprises power circuit, power circuit and the drive circuit that connects successively, described power circuit is comprised of the resonant circuit, the switching tube IGBT that mutually sequentially connect, steps of the method are
When the resonant circuit starting of oscillation, at first open I GBT signal by CPU output, for the first time open I GBT and after the time of delaying time, output is turn-offed I GBT signal and after the time of delaying time, for the second time output is opened I GBT signal and I GBT is opened and the whole control circuit of conducting again, and then starts electromagnetic oven.
2. the starting method of parallel single pipe type electromagnetic oven according to claim 1, it is characterized in that: the time-delay after I GBT opens for the first time is less than 2 μ S.
3. the starting method of parallel single pipe type electromagnetic oven according to claim 1, it is characterized in that: the time-delay after I GBT is turned off for the first time is less than 1.5 μ S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010272842 CN101977455B (en) | 2010-09-02 | 2010-09-02 | Starting method of parallel single pipe type electromagnetic oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010272842 CN101977455B (en) | 2010-09-02 | 2010-09-02 | Starting method of parallel single pipe type electromagnetic oven |
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| Publication Number | Publication Date |
|---|---|
| CN101977455A CN101977455A (en) | 2011-02-16 |
| CN101977455B true CN101977455B (en) | 2013-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010272842 Active CN101977455B (en) | 2010-09-02 | 2010-09-02 | Starting method of parallel single pipe type electromagnetic oven |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106488600B (en) * | 2015-08-25 | 2019-11-22 | 比亚迪股份有限公司 | Electromagnetic heater and its heating control circuit and control method |
| CN107315362A (en) * | 2017-06-23 | 2017-11-03 | 九阳股份有限公司 | The startup control method of cooking apparatus |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4345135A (en) * | 1980-11-28 | 1982-08-17 | General Electric Company | Delay-start arrangement for a microwave oven |
| CN2826891Y (en) * | 2005-08-17 | 2006-10-11 | 黄海宁 | Control structure of electromagnetic oven |
| CN201491306U (en) * | 2009-09-04 | 2010-05-26 | 东莞市前锋电子有限公司 | Low-power continuously heating circuit device of electromagnetic heating apparatus |
| CN101752845A (en) * | 2008-12-12 | 2010-06-23 | 深圳市鑫汇科科技有限公司 | Voltage and current surge protection method for electromagnetic oven and circuit thereof |
| EP2209197A1 (en) * | 2009-01-16 | 2010-07-21 | Whirpool Corporation | Method for controlling resonant power converters in induction heating systems, and induction heating system for carrying out such method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60150582A (en) * | 1984-01-17 | 1985-08-08 | 株式会社東芝 | Cooking device |
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2010
- 2010-09-02 CN CN 201010272842 patent/CN101977455B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4345135A (en) * | 1980-11-28 | 1982-08-17 | General Electric Company | Delay-start arrangement for a microwave oven |
| CN2826891Y (en) * | 2005-08-17 | 2006-10-11 | 黄海宁 | Control structure of electromagnetic oven |
| CN101752845A (en) * | 2008-12-12 | 2010-06-23 | 深圳市鑫汇科科技有限公司 | Voltage and current surge protection method for electromagnetic oven and circuit thereof |
| EP2209197A1 (en) * | 2009-01-16 | 2010-07-21 | Whirpool Corporation | Method for controlling resonant power converters in induction heating systems, and induction heating system for carrying out such method |
| CN201491306U (en) * | 2009-09-04 | 2010-05-26 | 东莞市前锋电子有限公司 | Low-power continuously heating circuit device of electromagnetic heating apparatus |
Non-Patent Citations (1)
| Title |
|---|
| JP昭60-150582A 1985.08.08 |
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| CN101977455A (en) | 2011-02-16 |
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Effective date of registration: 20110909 Address after: 314112, Qian Tang Road, Huimin street, Jiashan County, Zhejiang Province, 18 Applicant after: Zhejiang Taizhou Aishida Electrical Equipment Co., Ltd. Address before: The town of Changan city of Dongguan province Guangdong 523860 Wusha Chen Wu Xin'an Industrial Park Guangdong oppo Electronic Industry Co Ltd Applicant before: Dongguan Bubugao Electrical appliances Co., Ltd. |
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