CN105165116A - An induction heating cooktop - Google Patents
An induction heating cooktop Download PDFInfo
- Publication number
- CN105165116A CN105165116A CN201380065442.8A CN201380065442A CN105165116A CN 105165116 A CN105165116 A CN 105165116A CN 201380065442 A CN201380065442 A CN 201380065442A CN 105165116 A CN105165116 A CN 105165116A
- Authority
- CN
- China
- Prior art keywords
- current
- circuit
- coil
- container
- induction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- 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
-
- 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
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/05—Heating plates with pan detection means
Abstract
The present invention relates to an induction heating cooktop (1) comprising a resonant circuit (6) having an induction coil (4) and a resonant capacitor (5) connected in parallel to the induction coil (4), a power switch (7), for example an IGBT, that drives the resonant circuit (6), a collector node (8) whereon resonance voltage (Vce) is generated during the non-conduction (turn-on) times of the power switch (7), a drive circuit (9) that provides the power switch (7) to be driven, and a control unit (11) that regulates the operation of the power switch (7) by controlling the drive circuit (9), and wherein the presence of the vessel (K) placed on the induction coil (4) and appropriate position thereof is determined in different heating settings and under variable AC mains voltage and temperature conditions.
Description
Technical field
The present invention relates to a kind of induction heating cooking stove, wherein, whether can be in suitable position by detecting position container thereon.
Background technology
Induction heating cooking stove carrys out work according to the principle of the ferromagnetic cooker (such as kettle) adopting magnetic field effect heating cast iron or the steel produced by induction coil.In prior art, Single switch quasi-resonance (SSQR) circuit formed by a power switch and resonant capacitor is for driving single induction coil.Due to cost advantage, Single switch quasi-resonance circuit (SSQR) is preferred; But they operate within the scope of narrower energy frequency, and can be only cooker through-put power in certain voltage and power bracket.In the induction heating cooking stove using Single switch quasi-resonance circuit (SSQR), can encounter problems in the different types of cooker of detection and the change in location of cooker on range.In addition, there will be difficulty in rail voltage fluctuation and the position of detecting cooker under condition of different temperatures.In some induction heating cooking stoves, employ multi-coil-multiple zone structural, heat can remain on the whole surface of cooking stove, thus provides flexibility for user.In such induction heating cooking stove, the induction coil of various shape and size is arranged on cooking stove on the surface.At variable rail voltage, depend on the input voltage of power setting, and under variable temperature conditions, during cooker through-put power, the detection of cooker position and other characteristic element (such as diameter, type and ferromagnetic characteristic) is quite crucial for the product employing multi-coil and Single switch quasi-resonance circuit (SSQR).In induction heating cooking stove, the position being positioned at the container on induction coil is generally limited by the circular threshold boundary line be drawn on cooking stove surface.If aimed at induction coil according to predetermined boundary line, then container can be heated efficiently.User to be allowed to container to slide into outside described boundary line a little, as long as thus container is positioned at high-efficiency heating district, just can carry out heating container with the power setting of expectation.Under the condition being in high-efficiency heating district, container should be heated according to the power setting selected by user, and variable rail voltage and the impact of temperature conditions can not be subject to, the high-efficiency heating district if container slides out, then this situation should be detected, and should interrupt to container transport energy.If do not detect that container skids off high-efficiency heating district, then container can not be heated according to selected power setting, and circuit board can be damaged.
European patent application No.EP2282606 relates to a kind of induction installation control method.By comparing resonance potential and predetermined fixed reference potential detects on induction coil whether there is container, its resistivity and size in control unit.
In European patent No.EP1629698, describe a kind of induction cook system, it comprises power inverter, microprocessor, protective circuit and pot testing circuit.
In Japanese patent application no.JP4371108, describe a kind of induction heating cooker, it comprises cooker testing circuit.
In Japanese patent application no.JP2011023163, describe a kind of rice cooker, wherein, under the supply voltage condition of instability, detect pot and whether be positioned on induction heater, or whether detection pot is positioned at the position of specifying.
In Japanese patent application No.JP2007066837, describe a kind of rice cooker, wherein, under the supply voltage condition of fluctuation, whether the kitchen tools detecting such as spoon, cutter and so on are positioned on induction heater.
Summary of the invention
The object of the invention is to realize a kind of induction heating cooking stove, wherein, under variable mains input voltage and temperature conditions, detect the position of the container be positioned on induction coil.
The induction heating cooking stove (illustrating in the first claim and respective claim thereof) realized to reach object of the present invention comprises bridge rectifier, resonant circuit, power switch (such as IGBT), collector node, current monitoring circuit and electric voltage observation circuit, alternation rail current is converted to direct current by bridge rectifier, resonant circuit has induction coil and resonant capacitor, power switch drives resonant circuit, collector node produces resonance potential, current monitoring circuit is connected to induction coil, coil current is provided, this coil current flows through induction coil, by this coil current is converted to voltage data, it is monitored, electric voltage observation circuit provides the monitoring to the resonance potential (power switching voltage) produced on collector node.
In one embodiment of the invention, current monitoring circuit comprises current sensing resistor, this current sensing resistor is connected to induction coil, and comprise current transformer and current sensing resistor in another embodiment of the present invention, this current transformer is connected to induction coil, and this current sensing resistor is connected in parallel to the primary side of current transformer.
In one embodiment of the invention, electric voltage observation circuit comprises voltage divider, and this voltage divider reduces resonance potential, thus it can be made easily to measure.
Control unit judges that container is positioned at the high-efficiency heating district on the upper plate of cooking stove, wherein, change if the resonance potential change monitored by means of electric voltage observation circuit is less than the limit resonance potential be previously recorded in its internal memory for the different capacity grade selected via user interface, then container is allowed to the level skidding off induction coil on a small quantity.
Once detect that container is positioned at high-efficiency heating district, then control unit compensates the induction coil electric current monitored by means of current monitoring circuit, if low, increase induction coil electric current, if height, reduce it, as long as therefore container is in high-efficiency heating district, even if skid off the level of induction coil on a small quantity, the power transferring to container also can keep constant.
Once detect that container skids off high-efficiency heating district, then control unit stops the operation of induction heating cooking stove.
In induction heating cooking stove of the present invention, under variable rail voltage and temperature conditions, control unit keeps according to the heating setpoint selected via user interface the power invariability being transferred to container.By accurately detecting the aligning of the container on induction coil, prevent the power switch and the damage of other electronic component that drive induction coil.
Accompanying drawing explanation
Shown in the drawings in order to reach the induction heating cooking stove that object of the present invention realizes, wherein:
Fig. 1 is the schematic top plan view of induction heating cooking stove.
Fig. 2 is the schematic diagram of the control circuit of induction heating cooking stove.
Fig. 3 is the schematic diagram of the control circuit of induction heating cooking stove in one embodiment of the invention.
The Reference numeral of the element shown in figure is as follows:
1. induction heating cooking stove
2. bridge rectifier
3. filter circuit
4. induction coil
5. resonant capacitor
6. resonant circuit
7. power switch
8. collector node
9. drive circuit
10. user interface
11. control units
12. current monitoring circuits
13. electric voltage observation circuits
14. current sensing resistors
15. current transformers
16. voltage dividers
Embodiment
Induction heating cooking stove 1 comprises bridge rectifier 2, high-frequency filter circuit 3 and one or more induction coil 4, the interchange received from main line is converted to direct current by this bridge rectifier 2, this high-frequency filter circuit 3 is positioned at the output of bridge rectifier 2, on the upper plate P being positioned at induction heater stove 1 thus between the period of heating being in the container K of high-efficiency heating district B, coil current I
lflow through this one or more induction coil 4.
Container K or other ferromagnetic cooking-vessels are placed on the upper plate P of induction heating cooking stove 1, thus be in high-efficiency heating district B, this high-efficiency heating district B allows them to exceed the boundary line S defining its position at induction coil 4 level place on a small quantity, and provides efficient heating (Fig. 1) for it.
Induction heating cooking stove 1 comprises resonant circuit 6, power switch 7, collector node 8, drive circuit 9, user interface 10 and control unit 11 (such as microprocessor), this resonant circuit 6 has resonant capacitor 5, this resonant capacitor 5 is connected in parallel to induction coil 4, this power switch 7 is such as IGBT (insulated gate bipolar transistor), there is collector electrode, emitter and fly-wheel diode, this power switch 7 drives resonant circuit 6, that is, be conducting state in scram position, resonant capacitor 5 is charged during ON time, disconnected conducting in the open position, resonant capacitor 5 is discharged at non-conduction time durations, and power is transferred to container K from induction coil 4, at non-conduction (opening) time durations of power switch 7, this collector node 8 produces the current collection-emitting voltage of resonance potential Vce or in other words power switch 7, this drive circuit 9 is to be in the driving voltage Vge driving power switch 7 of required level, this user interface 10 is with the power level heating container K expected, user regulates heating setpoint by this user interface 10, this control unit 11 is according to the heating setpoint selected via user interface 10 operation (Fig. 2 by means of drive circuit 9 regulating power switch 7, Fig. 3).
As long as the container K be positioned on the upper plate P of induction heating cooking stove 1 is in the high-efficiency heating district B than the boundary line S be marked on upper plate P with larger diameter, then container K is by receiving constant power according to the heating setpoint (power grade) selected via user interface 10 and being heated.User is allowed to the level that a small amount of slides container K exceeds induction coil 4.If container K slides into outside high-efficiency heating district B, then interrupt the power being transferred to container K from induction coil 4.
In induction heating cooking stove 1, the ON time that power switch 7 is in scram position is determined by the heating setpoint selected via user interface 10.Power switch 7 non-conduction time in an open position depends on that the temperature of the characteristic element of the container K be positioned on induction coil 4, the aligning of container K on induction coil 4, rail voltage condition and container K is determined by control unit 11.At the non-conduction time durations of power switch 7, produce resonance potential Vce, coil current I at collector node 8 place
lflow through induction coil 4, and energy is transferred to container K.
Induction heating cooking stove 1 of the present invention comprises,
-current monitoring circuit 12, this current monitoring circuit 12 is connected to induction coil 4, and passes through coil current I during power delivery to container K
lbe converted to voltage data and monitor coil current I
l,
-electric voltage observation circuit 13, this electric voltage observation circuit 13 is connected to collector node 8, and monitors resonance potential changes delta Vce during power delivery to container K, and
-control unit 11, if the resonance potential changes delta Vce monitored by means of electric voltage observation circuit 13 is less than the limit resonance potential changes delta Vce-lim be previously recorded in for the different capacity grade selected via user interface 10 in its internal memory, then this control unit 11 judges that container K is positioned at high-efficiency heating district B, and by intervening the coil current I monitored by means of current monitoring circuit 12
lcarry out hold-in winding electric current I
lconstant, thus enable the power transferring to container K keep constant.
If the resonance potential changes delta Vce monitored by means of electric voltage observation circuit 13 is greater than the limit resonance potential changes delta Vce-lim be previously recorded in for different capacity grade in its internal memory, then control unit 11 judges that container K slides into outside high-efficiency heating district B, interrupt line loop current I
land stop the operation of induction heating cooking stove 1.
In induction heating cooking stove 1, when container K skids off induction coil 4 on a small quantity, determine whether container K is positioned at high-efficiency heating district B by means of electric voltage observation circuit 13.If container K is positioned at high-efficiency heating district B, then control unit 11 hold-in winding electric current I
lconstant, and therefore under variable rail voltage and temperature conditions, keep by means of current monitoring circuit 12 and drive circuit 9 power invariability transferring to container K.Even if skidded off the level of induction coil 4 on a small quantity, container K can have been heated according to the heating setpoint selected via user interface 10 in high-efficiency heating district B.
In one embodiment of the invention, control unit 11 will to be previously recorded in its internal memory and to correspond to the constant line loop current I of the heating setpoint selected via user interface 10
l-SBwith the actual coil electric current I monitored by means of current monitoring circuit 12
lcompare, intervene power switch 7 by means of drive circuit 9, and make actual coil electric current I
lequal constant line loop current I
l-SB, thus enable the power transferring to container K from induction coil 4 keep constant.
In one embodiment of the invention, current monitoring circuit 12 comprises current sensing resistor 14, and this current sensing resistor 14 is connected to induction coil 4, and by coil current I
lbe converted to voltage data (Fig. 3).Control unit 11 from the terminal reception of current sensing resistor 14 about coil current I
lvoltage data.
In another embodiment of the invention, current monitoring circuit 12 comprises current transformer 15, and this current transformer 15 is connected to induction coil 4, and by coil current I
lbeing decreased to can the level that detects of controlled unit 11, and current sensing resistor 14 is connected in parallel to the primary side (Fig. 2) of current transformer 15.
In another embodiment of the invention, electric voltage observation circuit 13 comprises voltage divider 16, this voltage divider 16 has resistor R1, R2 of being connected to collector node 8, and by the low level resonance potential Vce easily monitored is applied to control unit 11 (Fig. 2, Fig. 3) by resonance potential Vce dividing potential drop.
In induction heating cooking stove 1 of the present invention, firm power is transferred to the container K being positioned at high-efficiency heating district B, and wherein, container K is allowed to the level skidding off induction coil 4 on a small quantity, and the slip of container K causes the change of resonance potential Vce.In order to detect the position of the container K be positioned on upper plate P, coil current I
lkeep constant, and the resonance potential Δ Vce that monitoring skids off induction coil 4 along with container K and changes.In order to keep with the heating setpoint selected via user interface 10 power invariability transferring to container K, control unit 11 hold-in winding electric current I
lconstant and to be slided the resonance potential changes delta Vce that causes and whether inspection instrument K exists or whether the container K detected on induction coil 4 aims at by container K by monitoring.Power switch 7 and other electronic circuit components obtain in order to avoid damage.In different heating setpoints, the position being positioned at the container K on induction coil 4 can be accurately detected under variable mains input voltage and temperature conditions, and with constant power heating container K.
Above being appreciated that, disclosed embodiment is not construed as limiting the invention, and those skilled in the art can easily draw different embodiments.These are interpreted as falling in claim of the present invention scope required for protection.
Claims (6)
1. an induction heating cooking stove (1), comprise bridge rectifier (2), filter circuit (3), one or more induction coil (4), resonant circuit (6), power switch (7), collector node (8), drive circuit (9), user interface (10) and control unit (11), interchange is converted to direct current by described bridge rectifier (2), described filter circuit (3) is positioned at the output of described bridge rectifier (2), the upper plate (P) being positioned at described induction heating cooking stove (1) in heating is gone up thus is in container (K) period of high-efficiency heating district (B), coil current (I
l) flow through described one or more induction coil (4), described resonant circuit (6) has the resonant capacitor (5) being connected in parallel to described induction coil (4), described power switch (7) drives described resonant circuit (6), described collector node (8) produces resonance potential (Vce), described drive circuit (9) drives described power switch (7), described control unit (11) regulates the operation of described power switch (7) by means of described drive circuit (9) according to the heating setpoint selected via described user interface (10), it is characterized in that,
-current monitoring circuit (12), described current monitoring circuit (12) is connected to described induction coil (4), and provides described coil current (I
l) monitoring,
-electric voltage observation circuit (13), described electric voltage observation circuit (13) is connected to described collector node (8), and provides the monitoring to resonance potential change (Δ Vce), and
-control unit (11), if resonance potential change (Δ Vce) monitored by means of described electric voltage observation circuit (13) is less than limit resonance potential change (Δ Vce-lim) be previously recorded in for the different capacity grade selected via described user interface (10) in its internal memory, then described control unit (11) judges that described container (K) is positioned at described high-efficiency heating district (B), and the coil current (I that maintenance monitors by means of described current monitoring circuit (12)
l) and be transferred to the power invariability of described container (K).
2. induction heating cooking stove (1) as claimed in claim 1, it is characterized in that, if resonance potential change (Δ Vce) monitored by means of described electric voltage observation circuit (13) is greater than described limit resonance potential change (Δ Vce-lim), then described control unit (11) judges that described container (K) slides into high-efficiency heating district (B) outward, and stops the operation of described induction heating cooking stove (1).
3. induction heating cooking stove (1) as claimed in claim 1 or 2, it is characterized in that, described control unit (11) will to be previously recorded in its internal memory and to correspond to the constant line loop current (I of the heating setpoint selected via described user interface (10)
l-SB) and actual coil electric current (I
l) compare, intervene described power switch (7) by means of described drive circuit (9), and make described actual coil electric current (I
l) described constant line loop current (I can be equaled
l-SB).
4. the induction heating cooking stove (1) as described in above-mentioned any one claim, it is characterized in that, described current monitoring circuit (12) comprises current sensing resistor (14), and described current sensing resistor (14) is connected to described induction coil (4) and by described coil current (I
l) be converted to voltage data.
5. the induction heating cooking stove (1) as described in any one of claim 1-3, it is characterized in that, described current monitoring circuit (12) comprises current transformer (15), and described current transformer (15) is connected to described induction coil (4) and reduces described coil current (I
l), and described current sensing resistor (14) is connected in parallel to described current transformer (15).
6. the induction heating cooking stove (1) as described in above-mentioned any one claim, it is characterized in that, described electric voltage observation circuit (13) comprises voltage divider (16), described voltage divider (16) has the resistor (R1, R2) that is connected to described collector node (8) and by being resonance potential (Vce) dividing potential drop and the low level resonance potential (Vce) of easily monitoring is applied to described control unit (11).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TRA2012/14557 | 2012-12-12 | ||
| TR201214557 | 2012-12-12 | ||
| PCT/EP2013/076220 WO2014090872A1 (en) | 2012-12-12 | 2013-12-11 | An induction heating cooktop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105165116A true CN105165116A (en) | 2015-12-16 |
Family
ID=49956129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380065442.8A Pending CN105165116A (en) | 2012-12-12 | 2013-12-11 | An induction heating cooktop |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2939500B1 (en) |
| CN (1) | CN105165116A (en) |
| WO (1) | WO2014090872A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398676A (en) * | 2018-04-23 | 2019-11-01 | 佛山市顺德区美的电热电器制造有限公司 | Moving condition detection method, device and the cooking equipment of cookware on cooking equipment |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106323010A (en) * | 2016-11-15 | 2017-01-11 | 天津林立感应加热电炉制造有限公司 | Large-diameter liftable induction heating furnace ring |
| US20190327792A1 (en) | 2018-04-23 | 2019-10-24 | Whirlpool Corporation | Control circuits and methods for distributed induction heating devices |
| US11140751B2 (en) * | 2018-04-23 | 2021-10-05 | Whirlpool Corporation | System and method for controlling quasi-resonant induction heating devices |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3889090A (en) * | 1973-06-15 | 1975-06-10 | Westinghouse Electric Corp | Induction heat cooking apparatus |
| GB2062985B (en) * | 1979-11-12 | 1983-11-02 | Matsushita Electric Ind Co Ltd | Small load detection by comparison between input and output parameters of an induction heat cooking apparatus |
| KR950007600A (en) * | 1993-08-10 | 1995-03-21 | 문정환 | Small Object Detection Circuit of Electronic Cooker |
-
2013
- 2013-12-11 CN CN201380065442.8A patent/CN105165116A/en active Pending
- 2013-12-11 EP EP13821078.6A patent/EP2939500B1/en not_active Not-in-force
- 2013-12-11 WO PCT/EP2013/076220 patent/WO2014090872A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398676A (en) * | 2018-04-23 | 2019-11-01 | 佛山市顺德区美的电热电器制造有限公司 | Moving condition detection method, device and the cooking equipment of cookware on cooking equipment |
| CN110398676B (en) * | 2018-04-23 | 2022-03-15 | 佛山市顺德区美的电热电器制造有限公司 | Cooking equipment and moving state detection method and device of pot on cooking equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2939500A1 (en) | 2015-11-04 |
| EP2939500B1 (en) | 2017-01-11 |
| WO2014090872A1 (en) | 2014-06-19 |
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Legal Events
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151216 |