CN204634075U - Electromagnetic heating system and switching tube thereof open control device - Google Patents
Electromagnetic heating system and switching tube thereof open control device Download PDFInfo
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- CN204634075U CN204634075U CN201520275936.5U CN201520275936U CN204634075U CN 204634075 U CN204634075 U CN 204634075U CN 201520275936 U CN201520275936 U CN 201520275936U CN 204634075 U CN204634075 U CN 204634075U
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Abstract
What the utility model discloses a kind of electromagnetic heating system and switching tube thereof opens control device, electromagnetic heating system comprises the drive circuit of resonant circuit and the driving switch pipe be made up of heater coil, resonant capacitance and switching tube, open control device to comprise: bleeder circuit, the first input end of bleeder circuit is connected with the collector electrode of switching tube, ground connection after second input of bleeder circuit is connected with the emitter of switching tube, the collector electrode of bleeder circuit switch tube and the instantaneous voltage at emitter two ends carry out dividing potential drop to export the first voltage; The comparison circuit be connected with the output of bleeder circuit, it exports comparison signal according to the first voltage; Main control unit, the main control unit be connected respectively with drive circuit and comparison circuit, it is according to the heating power of comparison signal adjustment electromagnetic heating system, meet to make switching tube and default open requirement, thus, can switching tube adjustment being required lower open-minded to presetting to open, adapting to different pans better, meeting the demand of user.
Description
Technical field
The utility model relates to living electric apparatus technical field, particularly a kind of electromagnetic heating system breaker in middle pipe open control device, a kind of electromagnetic heating system and a kind of electromagnetic heating system breaker in middle pipe open control device.
Background technology
When IGBT pipe is opened, optimal state is that Uce ' (voltage between the collector electrode of IGBT pipe and emitter) is zero and oppositely freewheel current is also zero, but due to the restriction of physical condition, Uce ' cannot oscillate to zero under many circumstances, heating power is less, Uce ' is more difficult oscillates to zero, now opens IGBT for open-minded in advance; Reverse freewheel current is also difficult to zero under many circumstances, and heating power is larger, and reverse freewheel current may be larger, now opens as delayed open-minded.
In the related, generally decide minimum value and the maximum of heating power by experiment, be less than predeterminated voltage, oppositely freewheel current to make Uce ' and be less than predetermined current.But, its shortcoming existed is that Uce ' and reverse freewheel current only just can be adjusted in preset range when using known pan, and for some pans of the unknown, cannot ensure that Uce ' and reverse freewheel current are all in preset range, IGBT may be caused like this to manage overheated, the problem be even damaged.Therefore, there are the needs improved in correlation technique.
Utility model content
The utility model is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, what an object of the present utility model was to propose a kind of electromagnetic heating system breaker in middle pipe opens control device, this device can by switching tube adjustment to preset open require lower open-minded.
Another object of the present utility model is to propose a kind of electromagnetic heating system.
For achieving the above object, what the utility model proposed on the one hand a kind of electromagnetic heating system breaker in middle pipe opens control device, described electromagnetic heating system comprises by heater coil, the resonant circuit that resonant capacitance and switching tube form and the drive circuit driving described switching tube, described control device of opening comprises: bleeder circuit, the first input end of described bleeder circuit is connected with the collector electrode of described switching tube, ground connection after second input of described bleeder circuit is connected with the emitter of described switching tube, the instantaneous voltage of described bleeder circuit to the collector electrode of described switching tube and emitter two ends carries out dividing potential drop to export the first voltage, comparison circuit, described comparison circuit is connected with the output of described bleeder circuit, and described comparison circuit exports comparison signal according to described first voltage, main control unit, described main control unit is connected with described comparison circuit respectively with described drive circuit, and described main control unit adjusts the heating power of described electromagnetic heating system according to described comparison signal, meets default open requirement to make described switching tube.
Control device is opened according to the electromagnetic heating system breaker in middle pipe that the utility model proposes, first dividing potential drop is carried out to export the first voltage by the collector electrode of bleeder circuit switch tube and the instantaneous voltage at emitter two ends, then comparison circuit exports comparison signal according to the first voltage, main control unit is according to the heating power of comparison signal adjustment electromagnetic heating system, meet to make switching tube and default open requirement, thus, can by switching tube adjustment to preset open require lower open-minded, adapt to different pans better, meet the demand of user, and switching tube can be avoided to generate heat because of advanced or delayed opening even damage.
Particularly, described comparison circuit comprises: the first comparator, the positive input terminal of described first comparator is connected with the output of described bleeder circuit, and the negative input end of described first comparator is connected with the first reference voltage end, and the output of described first comparator is connected with described main control unit; Second comparator, the negative input end of described second comparator is connected with the output of described bleeder circuit, the positive input terminal of described second comparator is connected with the second reference voltage end, the output of described second comparator is connected with described main control unit, wherein, the first reference voltage that described first reference voltage end provides is greater than the second reference voltage that described second reference voltage end provides.
Further, while described switching tube is opened and described first comparator export high level, described main control unit judges that described switching tube is open-minded in advance, and increases the heating power of described electromagnetic heating system; While described switching tube is opened and described second comparator export high level, described main control unit judges that described switching tube is delayed open-minded, and reduces the heating power of described electromagnetic heating system.
Particularly, described switching tube is IGBT pipe, the C pole of described IGBT pipe is connected with resonant capacitance with the described heater coil of parallel connection, and the C pole of described IGBT is connected with the first input end of described bleeder circuit, ground connection after the E pole of described IGBT pipe is connected with the second input of described bleeder circuit, the G pole of described IGBT pipe is connected with described drive circuit.
Particularly, described bleeder circuit comprises the first resistance and second resistance of series connection, and have first node between the first resistance of described series connection and the second resistance, described first node is as the output of described bleeder circuit.
For achieving the above object, the utility model proposes a kind of electromagnetic heating system on the other hand, and what comprise described switching tube opens control device.
According to utility model propose electromagnetic heating system, can by switching tube adjustment to preset open require descend open-minded, adapt to different pans better, meet the demand of user.
Particularly, described electromagnetic heating system can comprise electromagnetic oven, electromagnetic rice cooker, prevention electromagnetic pressure cooker.
Accompanying drawing explanation
Fig. 1 is the schematic diagram opening control device of the electromagnetic heating system breaker in middle pipe according to the embodiment of the present invention;
Fig. 2 is the schematic diagram opening control device of the electromagnetic heating system breaker in middle pipe according to the present invention's specific embodiment;
Fig. 3 is the waveform schematic diagram that voltage and current when opening in advance occurs switching tube; And
Fig. 4 is the waveform schematic diagram that delayed voltage and current when opening occurs switching tube.
Reference numeral:
Heater coil L2, resonant capacitance C2, switching tube Q1, resonant circuit 20, drive circuit 30, open control device 10, bleeder circuit 101, comparison circuit 102, main control unit 102, first comparator U1, the second comparator U2, the first resistance R1, the second resistance R2, filter inductance L1, filter capacitor C1 and rectifier 40.
Embodiment
Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.
What below with reference to the accompanying drawings describe the electromagnetic heating system breaker in middle pipe of the utility model embodiment proposition opens control device and electromagnetic heating system, and wherein, electromagnetic heating system is used for heating pan.
Fig. 1 is the schematic diagram opening control device of the electromagnetic heating system breaker in middle pipe according to the utility model embodiment.As shown in Figure 1, electromagnetic heating system comprises the drive circuit 30 of the resonant circuit 20 and driving switch pipe Q1 be made up of heater coil L2, resonant capacitance C2 and switching tube Q1.Wherein, resonant circuit 20 is for carrying out resonance heating to pan, particularly, when switching tube Q1 is under the driving of drive circuit 30 during conducting, heater coil L2 obtains charging, for the vibration maintained between heater coil L2 and resonant capacitance C2 is prepared, when switching tube Q1 turns off under the driving of drive circuit 30, heater coil L2 and resonant capacitance C2 vibrates.Produce alternating magnetic field around heater coil L2 thus, the magnetic line of force major part of alternating magnetic field by pan, and produces a large amount of eddy current in the bottom of a pan of pan, thus produces the heat needed for culinary art.
In the utility model embodiment, as shown in Figure 1, open control device 10 to comprise: bleeder circuit 101, comparison circuit 102 and main control unit 103.
The first input end of bleeder circuit 101 is connected with the collector electrode of switching tube Q1, ground connection after second input of bleeder circuit 101 is connected with the emitter of switching tube Q1, namely say, between the collector electrode that bleeder circuit 101 is connected in parallel on switching tube Q1 and emitter, the collector electrode of bleeder circuit 101 switch tube Q1 and the instantaneous voltage at emitter two ends carry out dividing potential drop to export the first voltage; Comparison circuit 102 is connected with the output of bleeder circuit 101, and comparison circuit 102 exports comparison signal according to the first voltage.That is, carry out dividing potential drop by the instantaneous voltage Uce between the collector electrode of bleeder circuit 101 switch tube Q1 and emitter,
Main control unit 103 is connected with comparison circuit 102 respectively with drive circuit 30, and main control unit 103, according to the heating power of comparison signal adjustment electromagnetic heating system, meets to make switching tube Q1 and default opens requirement.That is, main control unit 102 can export pwm control signal to drive circuit 30, and to make the pipe Q1 conducting of drive circuit 30 driving switch or shutoff, main control unit 102 also can obtain the comparison signal that comparison circuit 102 exports.
It should be noted that, opening of the presetting voltage U ce that requirement specifically refers between the collector electrode of switching tube Q1 and emitter be less than predeterminated voltage and oppositely freewheel current be less than predetermined current.
Also it should be noted that, the factor such as pan and heating power all can affect the open-minded of switching tube Q1.If heating power is lower, switching tube Q1 may occur open-minded in advance; If heating power is higher, switching tube Q1 may occur delayed open-minded, default opens requirement, and then make electromagnetic heating system adapt to different pans by adjustment heating power to make switching tube Q1 meet.
Carry out in the process heated at electromagnetic heating system, the utility model embodiment open control device 10, first dividing potential drop is carried out by the instantaneous voltage Uce between the collector electrode of bleeder circuit 101 switch tube Q1 and emitter, and the voltage signal (i.e. the first voltage) after dividing potential drop is inputed to comparison circuit 102, comparison circuit 102 compares according to the first voltage and comparative result is sent to main control unit 103, according to comparative result, main control unit 103 judges that whether advanced switching tube Q1 is or delayed open-minded, if advanced or delayed open-minded, then adjust heating power, with meet preset open requirement, open-minded if not lead and lag, then maintain current heating power.In other words, transient voltage when main control unit 103 is opened by detection switch pipe Q1 between collector electrode and emitter, judges whether switching tube Q1 occurs to open in advance or delayed open-minded.
Thus, the electromagnetic heating system breaker in middle pipe that the utility model proposes open control device, first dividing potential drop is carried out to export the first voltage by the collector electrode of bleeder circuit switch tube and the instantaneous voltage at emitter two ends, then comparison circuit exports comparison signal according to the first voltage, main control unit is according to the heating power of comparison signal adjustment electromagnetic heating system, meet to make switching tube and default open requirement, thus, can by switching tube adjustment to preset open require lower open-minded, adapt to different pans better, meet the demand of user, and switching tube can be avoided to generate heat because of advanced or delayed opening even damage.
According to a concrete example of the present utility model, the duty ratio of the pwm control signal that main control unit 102 exports by adjustment reaches the object of adjustment heating power.
According to a specific embodiment of the present utility model, as shown in Figure 2, comparison circuit 102 comprises: the first comparator U1 and the second comparator U2.
Wherein, the positive input terminal of the first comparator U1 is connected with the output of bleeder circuit 101, and the negative input end of the first comparator U1 is connected with the first reference voltage end, and the output of the first comparator U1 is connected with main control unit 103; The negative input end of the second comparator U2 is connected with the output of bleeder circuit 101, the positive input terminal of the second comparator U2 is connected with the second reference voltage end, the output of the second comparator U2 is connected with main control unit 103, wherein, the first reference voltage Vref _ Max that the first reference voltage end provides is greater than the second reference voltage Vref _ Min that the second reference voltage end provides.
It should be noted that, the first reference voltage Vref _ Max is the maximum permissible value of switching tube Q1 first voltage when opening, and the second reference voltage Vref _ Min is the minimum permissible value of switching tube Q1 first voltage when opening.If the first voltage is greater than the second reference voltage Vref _ Min and be less than the first reference voltage Vref _ Max, then switching tube Q1 meets and default opens requirement; If the first voltage is less than the second reference voltage Vref _ Min or is greater than the first reference voltage Vref _ Max, then switching tube Q1 sends advanced or delayed open-minded.
Further, while switching tube Q1 opens and first comparator U1 export high level, main control unit 103 judges that switching tube Q1 is open-minded in advance, and increases the heating power of electromagnetic heating system; While switching tube is opened and second comparator U2 export high level, main control unit 103 judges that switching tube Q1 is delayed open-minded, and reduces the heating power of electromagnetic heating system.
It should be noted that, when switching tube Q1 occurs to open in advance, voltage U ce between the collector electrode of switching tube Q1 and emitter and flow through switching tube Q1 electric current I ce waveform as shown in Figure 3, voltage U ce when switching tube Q1 opens between its collector electrode and emitter is comparatively large, and switching tube loss is larger; When there is delayed opening in switching tube Q1, voltage U ce between the collector electrode of switching tube Q1 and emitter and flow through switching tube Q1 electric current I ce waveform as shown in Figure 4, voltage U ce when switching tube Q1 opens between its collector electrode and emitter is zero or negative value, and switching tube also has comparatively lossy.
As mentioned above, when switching tube Q1 opens, when the pwm control signal namely exported at main control unit 102 becomes high level from low level, main control unit 103 obtains the comparison signal that the first comparator U1 and the second comparator U2 exports.If the first comparator U1 exports high level signal, then illustrate that the first voltage is more than the first reference voltage Vref _ Max, instantaneous voltage Uce between the collector electrode of switching tube Q1 and emitter exceedes predeterminated voltage, switching tube Q1 occurs open-minded in advance, now main control unit 102 increases the heating power of electromagnetic heating system, to reduce voltage U ce, voltage U ce is dropped to and is less than predeterminated voltage, meet to preset and open requirement, thus better adapt to pan.If the second comparator U2 exports high level signal, then illustrate that the first voltage is lower than the second reference voltage Vref _ Min, switching tube Q1 occurs delayed open-minded, now main control unit 102 reduces the heating power of electromagnetic heating system, reduce to make hysteresis loss, meet to preset and open requirement, thus better adapt to pan.
According to a specific embodiment of the present utility model, as shown in Figure 2, switching tube Q1 can be IGBT pipe, the C pole of IGBT pipe is connected with resonant capacitance C2 with the heater coil L2 of parallel connection, and the C pole of IGBT is connected with the first input end of bleeder circuit 101, ground connection after the E pole of IGBT pipe is connected with the second input of bleeder circuit 101, the G pole of IGBT pipe is connected with drive circuit 30.
Particularly, as shown in Figure 2, bleeder circuit 101 comprises the first resistance R1 and the second resistance R2.
Wherein, first resistance R1 and the second resistance R2 connects, have first node between first resistance R1 of series connection and the second resistance R2, first node is as the output of bleeder circuit 101, and first node is connected with the negative input end of the second comparator U2 with the positive input terminal of the first comparator U1 respectively.
Particularly, the first resistance R1 and the second resistance R2 can carry out dividing potential drop by the instantaneous voltage between the collector electrode of switch tube Q1 and emitter.
Further, as the example of Fig. 2, electromagnetic heating system also can comprise filter inductance L1, filter capacitor C1 and rectifier 40.
Particularly, one end of filter inductance L1 is connected with one end of resonant capacitance C2 with the heater coil L2 after parallel connection, and wherein, the heater coil L2 after parallel connection is extremely connected with the C of IGBT pipe with the other end of resonant capacitance C2; One end of filter capacitor C1 is connected with one end of filter inductance L1, the other end ground connection of filter capacitor C1; The first input end of rectifier 40 is connected with the live wire L of AC power AC, and the second input of rectifier 40 is connected with the zero line N of AC power AC, and the first output of rectifier 40 is connected with the other end of filter inductance L1, the second output head grounding of rectifier 40.
In addition, the utility model embodiment also proposed a kind of electromagnetic heating system, and what comprise the switching tube of above-described embodiment opens control device.
According to the utility model embodiment propose electromagnetic heating system, can by switching tube adjustment to preset open require descend open-minded, adapt to different pans better, meet the demand of user.
According to a specific embodiment of the present utility model, electromagnetic heating system can comprise electromagnetic oven, electromagnetic rice cooker, prevention electromagnetic pressure cooker etc.
In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In description of the present utility model, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the utility model, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, the concrete meaning of above-mentioned term in the utility model can be understood as the case may be.
In the utility model, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present utility model or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and described embodiment of the present utility model above, be understandable that, above-described embodiment is exemplary, can not be interpreted as restriction of the present utility model, those of ordinary skill in the art can change above-described embodiment, revises, replace and modification in scope of the present utility model.
Claims (7)
1. an electromagnetic heating system breaker in middle pipe open control device, it is characterized in that, described electromagnetic heating system comprises the resonant circuit be made up of heater coil, resonant capacitance and switching tube and the drive circuit driving described switching tube, and described control device of opening comprises:
Bleeder circuit, the first input end of described bleeder circuit is connected with the collector electrode of described switching tube, ground connection after second input of described bleeder circuit is connected with the emitter of described switching tube, the instantaneous voltage of described bleeder circuit to the collector electrode of described switching tube and emitter two ends carries out dividing potential drop to export the first voltage;
Comparison circuit, described comparison circuit is connected with the output of described bleeder circuit, and described comparison circuit exports comparison signal according to described first voltage;
Main control unit, described main control unit is connected with described comparison circuit respectively with described drive circuit, and described main control unit adjusts the heating power of described electromagnetic heating system according to described comparison signal, meets default open requirement to make described switching tube.
2. electromagnetic heating system breaker in middle pipe as claimed in claim 1 open control device, it is characterized in that, described comparison circuit comprises:
First comparator, the positive input terminal of described first comparator is connected with the output of described bleeder circuit, and the negative input end of described first comparator is connected with the first reference voltage end, and the output of described first comparator is connected with described main control unit;
Second comparator, the negative input end of described second comparator is connected with the output of described bleeder circuit, the positive input terminal of described second comparator is connected with the second reference voltage end, the output of described second comparator is connected with described main control unit, wherein, the first reference voltage that described first reference voltage end provides is greater than the second reference voltage that described second reference voltage end provides.
3. electromagnetic heating system breaker in middle pipe as claimed in claim 2 open control device, it is characterized in that,
While described switching tube is opened and described first comparator export high level, described main control unit judges that described switching tube is open-minded in advance, and increases the heating power of described electromagnetic heating system;
While described switching tube is opened and described second comparator export high level, described main control unit judges that described switching tube is delayed open-minded, and reduces the heating power of described electromagnetic heating system.
4. electromagnetic heating system breaker in middle pipe as claimed in claim 1 open control device, it is characterized in that, described switching tube is IGBT pipe, the C pole of described IGBT pipe is connected with resonant capacitance with the described heater coil of parallel connection, and the C pole of described IGBT is connected with the first input end of described bleeder circuit, ground connection after the E pole of described IGBT pipe is connected with the second input of described bleeder circuit, the G pole of described IGBT pipe is connected with described drive circuit.
5. electromagnetic heating system breaker in middle pipe as claimed in claim 1 open control device, it is characterized in that, described bleeder circuit comprises the first resistance and second resistance of series connection, have first node between first resistance of described series connection and the second resistance, described first node is as the output of described bleeder circuit.
6. an electromagnetic heating system, is characterized in that, what comprise the switching tube according to any one of claim 1-5 opens control device.
7. electromagnetic heating system as claimed in claim 6, it is characterized in that, described electromagnetic heating system comprises electromagnetic oven, electromagnetic rice cooker, prevention electromagnetic pressure cooker.
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| CN201520275936.5U CN204634075U (en) | 2015-04-30 | 2015-04-30 | Electromagnetic heating system and switching tube thereof open control device |
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| CN201520275936.5U CN204634075U (en) | 2015-04-30 | 2015-04-30 | Electromagnetic heating system and switching tube thereof open control device |
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| CN204634075U true CN204634075U (en) | 2015-09-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105465847A (en) * | 2016-01-13 | 2016-04-06 | 昂宝电子（上海）有限公司 | Analog control system for electromagnetic oven and electromagnetic oven |
| CN107404308A (en) * | 2016-05-18 | 2017-11-28 | 佛山市顺德区美的电热电器制造有限公司 | The protection circuit of switching tube and there is its Electromagnetic Heating cooking equipment |
-
2015
- 2015-04-30 CN CN201520275936.5U patent/CN204634075U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105465847A (en) * | 2016-01-13 | 2016-04-06 | 昂宝电子（上海）有限公司 | Analog control system for electromagnetic oven and electromagnetic oven |
| CN110410834A (en) * | 2016-01-13 | 2019-11-05 | 昂宝电子（上海）有限公司 | Analog control system and electromagnetic oven for electromagnetic oven |
| CN107404308A (en) * | 2016-05-18 | 2017-11-28 | 佛山市顺德区美的电热电器制造有限公司 | The protection circuit of switching tube and there is its Electromagnetic Heating cooking equipment |
| CN107404308B (en) * | 2016-05-18 | 2020-11-20 | 佛山市顺德区美的电热电器制造有限公司 | Protection circuit of switch tube and electromagnetic heating cooking equipment with same |
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