CN204539517U - 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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- CN204539517U CN204539517U CN201520275853.6U CN201520275853U CN204539517U CN 204539517 U CN204539517 U CN 204539517U CN 201520275853 U CN201520275853 U CN 201520275853U CN 204539517 U CN204539517 U CN 204539517U
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Abstract
What the utility model discloses a kind of electromagnetic heating system and switching tube thereof opens control device, wherein 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; AD converter, AD converter is connected with the output of bleeder circuit, and the first voltage transitions is become an AD value by AD converter; Main control unit, main control unit is connected with AD converter respectively with drive circuit, main control unit obtains the collector electrode of switching tube and the instantaneous voltage at emitter two ends to adjust the heating power of electromagnetic heating system according to an AD value, meet to make switching tube and default open requirement, thus can switching tube adjustment be required lower open-minded to default opening, adapt to different pans better, meet the demand of user.
Description
Technical field
The utility model relates to living electric apparatus technical field, particularly the opening control device and a kind ofly have the electromagnetic heating system that this opens control device of a kind of electromagnetic heating system breaker in middle pipe.
Background technology
In electromagnetic heating system such as electromagnetic oven, when power switch 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, particularly 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, can require lower open-minded by switching tube adjustment, ensure that switching tube works safely and reliably to opening of presetting.
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 proposes a kind of electromagnetic heating system breaker in middle pipe opens control device, wherein, 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, AD converter, described AD converter is connected with the output of described bleeder circuit, and described first voltage transitions is become an AD value by described AD converter, main control unit, described main control unit is connected with described AD converter respectively with described drive circuit, described main control unit obtains the collector electrode of described switching tube and the instantaneous voltage at emitter two ends according to a described AD value, and the heating power of described electromagnetic heating system is adjusted according to the collector electrode of described switching tube and the instantaneous voltage at emitter two ends, meet to make described switching tube and default open requirement.
Control device is opened according to the electromagnetic heating system breaker in middle pipe that the utility model proposes, 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, and the first voltage transitions is become an AD value by AD converter, such collector electrode of voltage detecting circuit sense switch pipe and the instantaneous voltage at emitter two ends, such main control unit obtains the collector electrode of switching tube and the instantaneous voltage at emitter two ends according to an AD value, and the heating power of electromagnetic heating system is adjusted according to the collector electrode of switching tube and the instantaneous voltage at emitter two ends, meet to make switching tube and default open requirement, thus can switching tube adjustment be required lower open-minded to default opening, 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, ensure that switching tube works safely and reliably.
Wherein, when a described AD value is greater than the first preset value, described main control unit judges that described switching tube is open-minded in advance, and increases the heating power of described electromagnetic heating system; And when a described AD value is less than the second preset value, described main control unit judges that described switching tube is delayed open-minded, and reduces the heating power of described electromagnetic heating system, wherein, described second preset value is less than described first preset value.
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 pipe 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.
Preferably, described AD converter can integrate with described main control unit.
In addition, the utility model also proposed a kind of electromagnetic heating system, and what it comprised above-mentioned electromagnetic heating system breaker in middle pipe opens control device.
According to the electromagnetic heating system that the utility model proposes, can switching tube adjustment be required to default opening lower open-minded, adapt to different pans better, meet the demand of user, ensure that switching tube works safely and reliably.
Wherein, 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 utility model embodiment;
Fig. 2 is the waveform schematic diagram that voltage and current when opening in advance occurs switching tube;
Fig. 3 is the waveform schematic diagram that delayed voltage and current when opening occurs switching tube; And
Fig. 4 is the schematic diagram opening control device of the electromagnetic heating system breaker in middle pipe according to the utility model specific embodiment.
Reference numeral:
Heater coil L2, resonant capacitance C2, switching tube Q1, resonant circuit 20, drive circuit 30, open control device 10, bleeder circuit 101, main control unit 102, AD converter 103, 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.
Below with reference to the accompanying drawings describe opening control device and having the electromagnetic heating system that this opens control device of the electromagnetic heating system breaker in middle pipe of the utility model embodiment proposition, 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, this 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 embodiment of the present utility model, as shown in Figure 1, open control device 10 to comprise: bleeder circuit 101, AD converter 103 and main control unit 102.Wherein, 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, 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, AD converter 103 is connected with the output of bleeder circuit 101, and described first voltage transitions is become an AD value by AD converter 103.Main control unit 102 is connected with AD converter 103 respectively with drive circuit 30, main control unit 102 obtains the collector electrode of switching tube Q1 and the instantaneous voltage at emitter two ends according to a described AD value, and the heating power of described electromagnetic heating system is adjusted according to the collector electrode of switching tube Q1 and the instantaneous voltage at emitter two ends, meet to make switching tube Q1 and default open requirement.
That is, the collector electrode of an AD value detection switch pipe Q1 that main control unit 102 is exported by AD converter 103 and the instantaneous voltage at emitter two ends, since judge whether switching tube Q1 occurs to open in advance or delayed open-minded.
Wherein, 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 obtains the collector electrode of switching tube and the instantaneous voltage Uce at emitter two ends according to an AD value.
It should be noted that, in embodiment of the present utility model, the requirement of opening preset specifically refers to that the voltage U ce between the collector electrode of switching tube Q1 and emitter is less than when switching tube Q1 opens in advance or equals the first voltage threshold, and voltage U ce between the collector electrode of switching tube Q1 and emitter switching tube Q1 is delayed open time be greater than or equal the second voltage threshold.
Also it should be noted that, whether switching tube Q1 meets opening of presetting requires to affect by the factor such as pan and heating power when opening.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, therefore, the control device of opening of the utility model embodiment default opens requirement by adjustment heating power to make switching tube Q1 meet, and then makes electromagnetic heating system adapt to different pans.
Carry out in the process heated at electromagnetic heating system, the collector electrode of switching tube and the instantaneous voltage at emitter two ends when opening by detection switch pipe Q1, since judge whether switching tube Q1 occurs to open in advance or delayed open-minded.When switching tube Q1 opens, main control unit 102 can obtain the collector electrode of switching tube and the instantaneous voltage at emitter two ends, and according to the collector electrode of switching tube and the instantaneous voltage at emitter two ends can judge switching tube Q1 whether meet preset open requirement.If met, then maintain current heating power constant; If do not met, namely switching tube Q1 is advanced or delayed open-minded, then need to adjust heating power.
Thus, the utility model embodiment propose electromagnetic heating system breaker in middle pipe open control device 10, adjusted the heating power of electromagnetic heating system with the instantaneous voltage of the collector electrode and emitter two ends that obtain switching tube by an AD value, meet to make switching tube Q1 and default open requirement, thus, can switching tube adjustment be required lower open-minded to default opening, 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.
Further, according to an embodiment of the present utility model, when a described AD value is greater than the first preset value, main control unit 102 judges that described switching tube is open-minded in advance, and increases the heating power of described electromagnetic heating system; And when a described AD value is less than the second preset value, main control unit 102 judges that described switching tube is delayed open-minded, and reduces the heating power of described electromagnetic heating system, wherein, described second preset value is less than described first preset value.It should be noted that, first preset value is corresponding with the first voltage threshold, second preset value is corresponding with the second voltage threshold, and the second voltage threshold is less than the first voltage threshold, and the second voltage threshold and the first voltage threshold can be demarcated according to the actual conditions of switching tube.
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 2, open in a flash at switching tube, the collector electrode of switching tube and the instantaneous voltage Uce at emitter two ends larger, this instantaneous voltage Uce1 can be detected like this, if Uce1 is now greater than the first preset value more than a first voltage threshold i.e. AD value, then judge that switching tube Q1 occurs open-minded in advance, cause switching tube loss 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 3, the collector electrode of switching tube in a flash opened at switching tube and the instantaneous voltage Uce at emitter two ends are 0 or negative value, if Uce2 is now less than a second voltage threshold i.e. AD value and is less than the second preset value, then judge that switching tube Q1 occurs delayed open-minded, switching tube also has comparatively lossy.
As mentioned above, the collector electrode of switching tube and the instantaneous voltage Uce at emitter two ends is obtained according to the large I of an AD value.When switching tube Q1 opens, namely when the pwm control signal exported at main control unit 102 becomes high level from low level, if the instantaneous voltage at the collector electrode of switching tube and emitter two ends is greater than the first voltage threshold, then main control unit 102 increases the heating power of electromagnetic heating system, to reduce the voltage U ce between collector electrode and emitter, voltage U ce is declined, reduce the loss of switching tube, make switching tube meet like this and default open requirement, thus adapt to pan better.If the instantaneous voltage at the collector electrode of switching tube and emitter two ends is less than the second voltage threshold, then main control unit 102 reduces the heating power of electromagnetic heating system, the hysteresis loss of switching tube is reduced, meets to make switching tube and default open requirement, thus adapt to pan better.
Thus, the opening control device and can switching tube adjustment be required to opening of presetting lower open-minded of the utility model embodiment, 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 specific embodiment of the present utility model, as shown in Figure 4, heater coil L2 can be in parallel with resonant capacitance C2, 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, the rear ground connection and the C pole of IGBT pipe is connected with the first output 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.
Further, as the example of Fig. 4, 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.
Further, as shown in Figure 4, bleeder circuit 101 comprises the first resistance R1 and the second resistance R2 of series connection, and have first node J1 between the first resistance R1 of series connection and the second resistance R2, first node J1, as the output of bleeder circuit 101, is connected with AD converter 103.
According to an embodiment of the present utility model, as shown in Figure 4, AD converter 103 also can integrate with main control unit 102, and such as AD converter 103 is integrated in main control unit 102.
According to the utility model embodiment propose electromagnetic heating system breaker in middle pipe open control device, 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, and the first voltage transitions is become an AD value by AD converter, such collector electrode of voltage detecting circuit sense switch pipe and the instantaneous voltage at emitter two ends, such main control unit obtains the collector electrode of switching tube and the instantaneous voltage at emitter two ends according to an AD value, and the heating power of electromagnetic heating system is adjusted according to the collector electrode of switching tube and the instantaneous voltage at emitter two ends, meet to make switching tube and default open requirement, thus can switching tube adjustment be required lower open-minded to default opening, 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, ensure that switching tube works safely and reliably.
In addition, the utility model embodiment also proposed a kind of electromagnetic heating system, and what comprise the switching tube of above-described embodiment description opens control device.
Wherein, electromagnetic heating system can comprise electromagnetic oven, electromagnetic rice cooker, prevention electromagnetic pressure cooker etc.
According to the electromagnetic heating system that the utility model embodiment proposes, can switching tube adjustment be required to default opening lower open-minded, adapt to different pans better, meet the demand of user, ensure that switching tube works safely and reliably.
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;
AD converter, described AD converter is connected with the output of described bleeder circuit, and described first voltage transitions is become an AD value by described AD converter;
Main control unit, described main control unit is connected with described AD converter respectively with described drive circuit, described main control unit obtains the collector electrode of described switching tube and the instantaneous voltage at emitter two ends according to a described AD value, and the heating power of described electromagnetic heating system is adjusted according to the collector electrode of described switching tube and the instantaneous voltage at emitter two ends, meet to make described switching tube and default open requirement.
2. electromagnetic heating system breaker in middle pipe as claimed in claim 1 open control device, it is characterized in that,
When a described AD value is greater than the first preset value, described main control unit judges that described switching tube is open-minded in advance, and increases the heating power of described electromagnetic heating system; And
When a described AD value is less than the second preset value, described main control unit judges that described switching tube is delayed open-minded, and reduces the heating power of described electromagnetic heating system, and wherein, described second preset value is less than described first preset value.
3. 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 pipe 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.
4. 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.
5. electromagnetic heating system breaker in middle pipe as claimed in claim 1 open control device, it is characterized in that, described AD converter can integrate with described main control unit.
6. an electromagnetic heating system, is characterized in that, what comprise the electromagnetic heating system breaker in middle pipe 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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| Application Number | Priority Date | Filing Date | Title |
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| CN201520275853.6U CN204539517U (en) | 2015-04-30 | 2015-04-30 | Electromagnetic heating system and switching tube thereof open control device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520275853.6U CN204539517U (en) | 2015-04-30 | 2015-04-30 | Electromagnetic heating system and switching tube thereof open control device |
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| CN204539517U true CN204539517U (en) | 2015-08-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109661053A (en) * | 2017-10-11 | 2019-04-19 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating utensil, electromagnetic heating system and its sync control device |
-
2015
- 2015-04-30 CN CN201520275853.6U patent/CN204539517U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109661053A (en) * | 2017-10-11 | 2019-04-19 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating utensil, electromagnetic heating system and its sync control device |
| CN109661053B (en) * | 2017-10-11 | 2021-03-19 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating appliance, electromagnetic heating system and synchronous control device thereof |
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