CN1170118A - Apparatus and method for judging kind of object placed on induction heating cooker - Google Patents

Apparatus and method for judging kind of object placed on induction heating cooker Download PDF

Info

Publication number
CN1170118A
CN1170118A CN97112135A CN97112135A CN1170118A CN 1170118 A CN1170118 A CN 1170118A CN 97112135 A CN97112135 A CN 97112135A CN 97112135 A CN97112135 A CN 97112135A CN 1170118 A CN1170118 A CN 1170118A
Authority
CN
China
Prior art keywords
container
voltage
gadget
converter
heated
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.)
Granted
Application number
CN97112135A
Other languages
Chinese (zh)
Other versions
CN1135907C (en
Inventor
金正泰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of CN1170118A publication Critical patent/CN1170118A/en
Application granted granted Critical
Publication of CN1135907C publication Critical patent/CN1135907C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

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
    • 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
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Cookers (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

The present invention provides a device and a method for judging the variety of an object placed on an induction heating cooker. The device consists of a rectifying or smoothing unit, a heating unit, a first current detector, a second current detector, a controller, a convertor-driving unit and a switch-driving unit. The device ensures that an object waiting to be heated on the induction heating cooker can be heated with an appropriate frequency.

Description

Judge the apparatus and method that are placed on the kind of object on the induction heating cooker
The present invention relates to a kind of induction heating cooker, whether being particularly related to a kind of judgement, to be placed on the object that can determine on the induction heating cooker be gadget as spoon and kitchen cutter, or ferromagnetism container or non-ferrous magnetic container, and utilize an appropriate frequency to suspend apparatus and method thus to the kind of object on the induction heating cooker of the heating operation of placement object.
With reference to showing the Fig. 1 that judges the manipulated or operated apparatus of heated material kind on the induction heating cooker, this device comprises: one by the rectifier BD that commercial ac power stream is carried out rectification, carry out rectification/smooth unit 1 that level and smooth inductor L1 and capacitor C1 form to commutating voltage; One drives converter INV that signal DS connects rectified commercial ac power stream, a pair of its each a end and the outlet terminal H of converter INV by response, the capacitor C2 that the corresponding end of L links to each other and the other end between them is connected with each other, C3 and be connected capacitor C2, the heating unit 2 of the actuating coil L composition of the object that the heating between another output M of the common port of C3 and converter is placed; A detection puts on the current detector 4 of the commercial ac power stream on rectification/smooth unit 1; Basis is come judgment object 3 kinds and is exported the controller 5 of a control signal CS with this from the voltage of current detector output; And converter driver element 6 that receives control signal CS and drive the converter in the heating unit 2.
The resonant frequency f of heating unit 2 RBe inductance and the resonant capacitor C1 according to actuating coil L, C2 capacitance is separately determined, following formula: f R = 1 2 π L ( C 1 + C 2 ) (wherein, f RThe expression resonant frequency).
The device that is used to judge kind of object to be heated on the induction heating cooker that the present invention so constitutes will be described below.
At first, when the user places actuating coil L to go up on object 3 and presses the start key (not shown), commercial ac power stream puts on induction heating cooker, controller 5 is exported to converter driver element 6 with control signal CS simultaneously, and this unit 6 is high-frequency driving signal DS of the output of the converter INV in heating unit 2 then.Converter INV is commutated, and is switched on or switched off the commercial ac power stream that carries out rectification in rectification/smooth unit 1 with this.
Suppose resonant frequency f according to above-mentioned formula heating unit 2 RBe 25MHz, in the starting stage of induction heating cooker work, a control signal CS is so that the frequency of heating unit 2 reaches 30MHz in controller 5 outputs.
At this moment, in current transformer CT, detect commercial ac power stream, and current detector 4 is to controller 5 one of output and the corresponding predetermined voltages of commercial ac power flow.Store this magnitude of voltage at this controller 5 with the form of data-signal.
Controller 5 output control signal CS, so that the commutating frequency among the converter INV is lower than 30MHz slightly, and reception stores from the voltage of current detector 4 outputs and with this voltage.
When the frequency of heating unit 2 in the process that is repeating above-mentioned steps rises to 28MHz, the magnitudes of voltage of the average input up to now of controller 5 also store it, and judge whether the object that is placed on the induction heater is gadget, if not gadget, to judge that also this object is magnetic material or nonmagnetic substance.When the object of placing is determined when being gadget, all operation stops so that no longer heating this gadget.On the contrary, not gadget but during the magnetic container, then select suitable frequency to come heating magnetically container 3 when the object of placing is determined.
Yet, the device that this judgement in traditional prior art is placed on the kind of object on the induction heating cooker is to change frequency in not comprising a scope of resonant frequency, this device constantly receives and the frequency correspondent voltage variable that changes, the value that receives is average, determine the kind of the object of placing, the time that has produced a considerable judgment object kind thus.
In addition, the shortcoming of the heater of traditional induction heating cooker is: in order to heat its surface resistance of heat transfer non magnetic container littler than magnetic container, should use frequency greater than about 80MHz of resonant frequency 25KMz, because the number of actuating coil bending is fixed, therefore non magnetic container is not heated.
Therefore, first purpose of the present invention provides the apparatus and method that a kind of judgement is placed on the kind of the object on the induction heating cooker, it can determine to be placed on the kind of the object on the induction heating cooker in short time cycle, and the commutating frequency of converter is fixed on the definite level.
Second purpose of the present invention provides the apparatus and method that a kind of judgement is placed on the kind of the object on the induction heating cooker, under the situation that the commutating frequency of converter is fixed, its detects the commercial ac power stream put on rectification unit and puts on the electric current of actuating coil from converter, and whether the object of determining to be placed on the cooker according to the electric current of these two detections is gadget.
The 3rd purpose of the present invention provides the apparatus and method that a kind of judgement is placed on the kind of the object on the induction heating cooker, and it is that magnetic container or non magnetic container come magnetropism container or non magnetic container to provide the circuit of suitable resonant frequency to form by the object that is placed on by judgement on the induction heating cooker.
In order to achieve the above object, according to the invention provides a kind of device that is placed on the kind of object on the induction heating cooker that is used to judge, this device comprises that one is carried out rectification and level and smooth rectification/smooth unit to commercial ac power stream; One is optionally heated the heating unit that is placed on the object on the induction heating cooker; A detection puts on the commercial ac power stream of rectification/smooth unit and this is detected current conversion and becomes voltage V aFirst current detector; A detection is flow through an actuating coil of heating unit and this is detected current conversion is voltage V bSecond current detector; The voltage V that reception is exported from first current detector aWith voltage V from the output of second current detector bAnd with these two voltage V a, V bEach value compare with predetermined magnitude of voltage, determine whether the object of unit to be heated heating is gadget, when judging that this object is not gadget, judge that this object is magnetic container or non magnetic container, and the controller of output control signal; Control command according to controller drives the converter driver element that signal is exported to heating unit with converter; And break-in driver element that comes the break-in driving signal of heating object to heating unit output with this signal.
In addition, in order to achieve the above object, provide a kind of method that is placed on the kind of object on the induction heating cooker that is used to according to the present invention judge, this method comprises the first step that comes heating object according to the frequency of judging gadget; The corresponding voltage of application ac flow of reading and wherein being detected and with second step of corresponding another voltage of the magnitude of current that puts on the actuating coil in the converter that is wherein detected; Two voltages that read in second step are compared with the predetermined reference voltage value respectively, determine whether object to be heated is gadget, when definite this object is not gadget, determine that this object is the magnetic container or the third step of non magnetic container; When judgment object is gadget, stop whole operations, suspend the heating operation of object thus, and when determining that object is not that the situation of gadget judges and changes the 4th step of the connected mode of heating unit when object is magnetic container or non magnetic container.
Fig. 1 judges the manipulated or operated apparatus that is placed on the kind of object on the induction heating cooker according to traditional prior art;
Fig. 2 judges the manipulated or operated apparatus that is placed on the kind of object on the induction heating cooker according to the present invention;
Fig. 3 illustrates the kind of object to be heated on the present invention and the induction heating cooker and the chart of big or small relevant detection magnitude of voltage;
Fig. 4 is the method flow diagram that diagram the present invention judges heated material kind on the induction heating cooker.
With reference to illustrating the Fig. 2 that is used to judge the device that is placed on the kind of object on the induction heating cooker according to of the present invention, this device has: one is carried out rectification and level and smooth rectification/smooth unit 1 to commercial ac power stream; One drives signal DS1 according to converter and makes rectification and level and smooth commercial ac power flow the heating unit that comprises a converter INV 20 of commutation; The a pair of upper end H of converter INV and resistor C2, the C3 between the L of lower end of being connected on mutually; Be connected on a pair of actuating coil L1, L2 and a resistor C4 between the common port of the middle-end M of converter INV and capacitor C2, C3 mutually; One with actuating coil L3 and resistor C4 switch SW in parallel; One is used to detect the commercial ac power stream that puts on rectification/smooth unit 1 and the current conversion that detects is become voltage V aFirst current detector 4; One be used for detecting from converter INV flow to heating unit 20 actuating coil L2 high frequency electric and the current conversion that detects become voltage V bSecond current detector 70; A reception is from the voltage of first current detector, 4 outputs and another voltage of exporting from second current detector 70, whether the object 3 of determining unit to be heated 20 heating is gadget and to determine to be judged as the object that is not gadget be magnetic container or non magnetic container, export a convertor controls signal CS1 who makes the converter INV commutation in the heating unit 2, and also export the controller 5 of switch controlling signal CS2 of the on/off operation of a switch SW in the control heating unit 2 simultaneously; One drives the converter driver element 6 that signal DS1 offers the converter INV in the heating unit 2 according to convertor controls signal CS1 with converter; And switch drive unit 80 that switching drive signal DS2 is offered the switch SW in the heating unit 2 according to relay control signal CS2.
First current detector 4 comprises: the first current transformer CR1 that detects the commercial ac power stream that puts on rectification/smooth unit 1; To become the first current/voltage converter 41 of alternating voltage by the commercial ac power stream translation that current transformer CT1 detects; Switched alternating voltage is carried out rectification/level and smooth first rectification/smooth unit 42; And make the voltage segment supercharging after the rectification/level and smooth and the voltage that this part increases is offered the part compress cell 43 of controller 5.
Second current detector 70 comprises: the intermediate terminals M and the middle high-frequency second current transformer CT2 that flows through actuating coil L2 that also detects of actuating coil L2 that are positioned at converter INV; To become second current/voltage converter 71 of alternating voltage by the high frequency current transitions that current transformer CT2 detects; Alternating voltage after the conversion is carried out rectification/level and smooth and end value offered the second rectification/smooth unit 72 of controller 5; And make through the voltage segment supercharging of rectification/level and smooth and the voltage that this part increases is offered the second portion compress cell 73 of controller 5.
With reference to Fig. 3 and Fig. 4 the operational circumstances that the present invention judges the device that is placed on the kind of object on the induction heating cooker is described below.
At first, when the user is placed on object to be heated on the actuating coil L and presses the start key (not shown), commercial ac power stream is applied in induction heating cooker, controller 5 is to switch drive unit 80 output switch control signal CS2 simultaneously, then switching drive signal DS2 is exported to the switch SW of heating unit 20 again in the switch drive unit, connect switch SW thus, this state is called ＂ magnetic pattern ＂, and another kind of switch SW closing state is called the non magnetic pattern ＂ of ＂.
The following resonant frequency separately of having expressed relative magnetic pattern and non magnetic pattern.
The non magnetic mode switch 1 of magnetic pattern is connected and is disconnected inductance L 2=La Ls+L3=Lb capacitor C 2+C3=Ca C 1 · ( C 2 + C 3 ) C 1 + ( C 2 + C 3 ) = Ck Resonant frequency
Figure A9711213500082
Figure A9711213500083
Shown in above-mentioned table, the device that is used to heat heated material 3 is actuating coil L2 and a pair of resistor C1, C3.
Secondly, controller 5 is to converter driver element 6 output translator control signal CS1, and correspondingly, converter driver element 6 drives signal DS1 to the converter INV of heating unit 20 output transform.
Here, convertor controls signal CS1 determines as one whether object to be heated is the control signal of gadget.The frequency of the heating unit 20 that produces according to this control signal CS1 is a certain values in the middle of the resonant frequency of the resonant frequency of magnetic pattern and non magnetic pattern.In the present invention, when the resonant frequency of magnetic pattern is the resonant frequency of 30KMz and non magnetic pattern when being 80KMz, the frequency of heating unit 20 is 50KMz, and this frequency is called ＂ determination frequency ＂.
Converter INV drives signal DS1 according to converter and commutates, so that the heated material on the heating work coil L2, the high frequency electric that flows through actuating coil L2 is detected by the second current transformer CT2, and the first current transformer CT1 detects commercial ac power stream simultaneously.
The electric current that is detected by the first current transformer CT1 of first current transformer 4 is converted into alternating voltage in first current/voltage converter 41, and in first rectification/smooth unit 42 by rectification and level and smooth.Voltage segment supercharging after making smoothly by the resistance R in first's compress cell 43 3, R4, R5.The voltage V that this part increases aImpose on controller 5.
The high frequency electric that is detected by the second current transformer CT2 in second current detector 70 is converted into alternating voltage in the second current/voltage converter 71, and in second rectification/smooth unit 72 by rectification and level and smooth.Voltage segment supercharging after making smoothly by the resistance R in the second portion compress cell 73 7, R8.The voltage V that this part increases bImpose on controller 5.
Fig. 3 is one and illustrates the kind of the heated material on of the present invention and the induction heating cooker and the table of big or small correspondent voltage value, and discloses by heating the resulting experimental result of object that some know its kind and size in advance.
As shown in FIG., the kind of object is the container of ferromagnetism container, non-ferrous magnetic container and Tipple Bottom, and to be divided into end length according to cell therefor be 7cm, 8cm and 9cm.
In the present invention, the length at its end is defined as gadget less than the object of 8cm at the bottom of.
As shown in Figure 3, under the situation of diameter less than 8cm of ferromagnetism container bottom, voltage V aShould be approximately greater than 1.2V, and voltage V bShould be approximately greater than 0.75V.
Under the situation of the end of Tipple Bottom container length greater than 8cm, voltage V aShould be approximately greater than 1.2V, and voltage V bShould be approximately greater than 1.8V.
Under the situation of the end of non-ferrous magnetic container length greater than 8cm, voltage V aShould be approximately greater than 1.45V, and voltage V bShould be approximately greater than 2.1V.
As the reference voltage of a judgement gadget, set the voltage V of ferromagnetism container and Tipple Bottom container respectively aBe 1.2V, and the voltage V of nonferromagnetic container bBe 1.8V.When object to be heated is confirmed as gadget, by working voltage V bJudge the kind of container.
Controller 5 is according to applied two voltage V a, V BAnalog value, determine the kind of object with reference to magnitude of voltage shown in Figure 3, and relevant explanation will be described below.
Fig. 4 is the flow chart of method that the present invention of a diagram judges the kind of the heated material on the induction heating cooker.
As shown in the figure, when the user presses start key and device of the present invention and brings into operation (step 1), controller 5 is selected (step 2) ＂ determination frequency ＂, and output switch control signal CS2 so that heating unit 20 move according to this determination frequency.
Then, when detecting commercial ac power stream, less than voltage V aImpose on controller 5, controller 5 reads (step 4) voltage V aValue and determine (step S5) voltage V aValue voltage 1.2V whether.
When the result who determines was not more than 1.2V, it was gadget that object 3 to be heated is judged (step S14), suspended the operation of converter INV thus and stopped whole operations of apparatus of the present invention.In addition, when being not more than 1.2V and being not less than 1.2B, judge consequently wrong and read (step S7) voltage V in addition again aValue.
During greater than 1.2V, read (step S6) applied voltage V at magnitude of voltage bValue, and judge (step S8) magnitude of voltage V bValue whether greater than 1.8V.
As magnitude of voltage V bValue when being not more than 1.8V, judge that whether (step S10) magnitude of voltage is greater than 0.75V and less than 1.0V; Otherwise it is gadget that object 3 to be heated is judged in step S14, S17.
Otherwise, satisfy the condition of step S10, then to be determined (step S13) be the ferromagnetism container to object 3, so switch SW keeps the state connected continuously, thus, the object 3 of ferromagnetism container heats with the magnetic pattern.
If satisfied the condition of step S8, judge (step S9) voltage V bValue whether less than 2.1V, if satisfied the condition of step S9, it is the Tipple Bottom container that object 3 is judged (step S12).So, output (step S16) switch controlling signal CS2, so switch SW is disconnected, and thus, the Tipple Bottom container become with non magnetic pattern heat.
If step S9 has satisfied predetermined condition, object 3 is determined that (step S11) is non-ferrous magnetic container, so execution in step S15, thus, object 3 heats with the magnetic pattern as non-ferrous magnetic container.
As mentioned above, the present invention is used for determining according to a fixing frequency whether object to be heated is gadget, and determining that this object is not to determine that it is magnetic container or non magnetic container under the situation of gadget, so that reduce the time of judgment object kind.
In addition, after the size of determining object, judge that this object of determining is magnetic container or non magnetic container, thus, utilize a suitable frequency to heat object to be heated.

Claims (9)

1. one kind is used to judge the device that is placed on the kind of object on the induction heating cooker, and it comprises:
One is carried out rectification and level and smooth rectification/smooth unit to commercial ac power stream;
One is optionally heated the heating unit that is placed on the object on the induction heating cooker;
One is used to detect the commercial ac power stream that puts on rectification/smooth unit and the current conversion that is detected is become voltage V aFirst current detector;
One is used for detecting the high frequency electric that flows through at least one actuating coil of heating unit and the current conversion that is detected is become voltage V bSecond current detector;
A voltage V who is used to receive from the output of first current detector aWith voltage V from the output of second current detector b, with two voltage V a, V bEach value compare with the predetermined reference voltage value, determine whether the object of unit to be heated heating is gadget, and when judging that it is not gadget, determine that this object is magnetic container or non magnetic container, and the controller of output control signal;
A converter driver element that drives signal according to the control signal of controller to the heating unit output translator;
Switch drive unit to the heating unit output switching drive signal of heating object optionally.
2. device as claimed in claim 1, wherein heating unit comprises:
One drives signal according to converter and makes rectification and level and smooth commercial ac power flow the converter that switches;
Be connected on first and second capacitors between the top and bottom of converter mutually;
First and second actuating coils and the 3rd capacitor of between the common port of the middle-end of converter and first and second capacitors, connecting mutually; And
One with second actuating coil and the 3rd capacitor switch in parallel.
3. device as claimed in claim 1, the predetermined reference voltage value is to obtain by the experiment that the size of reference heated material bottom is carried out in its middle controller.
4. device as claimed in claim 2, wherein when object to be heated is confirmed as the magnetic container, controller is connected the switch controlling signal of switch to the output of switch drive unit, and when object to be heated was confirmed as non magnetic container, controller was to the switch controlling signal of switch drive unit output cut-off switch.
5. device as claimed in claim 4, wherein the magnetic container is ferromagnetism container or non-ferrous magnetic container, and non magnetic container is the container of Tipple Bottom.
6. one kind is used to judge the method that is placed on the kind of object on the induction heating cooker, and it comprises:
Come the first step of heating object according to the frequency of judging gadget;
Read and the corresponding voltage of application ac flow that wherein detects, and with second step that detect and put on corresponding another voltage of the magnitude of current of actuating coil by converter wherein;
With two voltage reading respectively in second step and predetermined reference voltage value relatively, determine whether object to be heated is gadget, when judging that it is not gadget, determine that this object is the magnetic container or the third step of non magnetic container; And
When judgment object is gadget, stop whole operations, suspend heating operation thus to object, when the situation that at object is not gadget judges object when being magnetic container or non magnetic container, change the 4th step of the connected mode in the heating unit.
7. method as claimed in claim 6 is wherein judged the resonant frequency of the frequency values of gadget greater than the heating magnetically container in the first step, and less than the resonant frequency that heats non magnetic container.
8. method as claimed in claim 6, wherein the predetermined reference voltage value is to obtain by the experiment that the bottom size of reference heated material is carried out in the third step.
9. method as claimed in claim 6, wherein the heated material on the induction heating cooker is ferromagnetism container or non-ferrous magnetic container in the magnetic pattern, and the heated material on the induction heating cooker is the container of Tipple Bottom in non magnetic pattern.
CNB971121354A 1996-06-07 1997-06-09 Apparatus and method for judging kind of object placed on induction heating cooker Expired - Fee Related CN1135907C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR20220/1996 1996-06-07
KR20220/96 1996-06-07
KR1019960020220A KR100186424B1 (en) 1996-06-07 1996-06-07 Small load judgement device and method for induction cooker

Publications (2)

Publication Number Publication Date
CN1170118A true CN1170118A (en) 1998-01-14
CN1135907C CN1135907C (en) 2004-01-21

Family

ID=19461017

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB971121354A Expired - Fee Related CN1135907C (en) 1996-06-07 1997-06-09 Apparatus and method for judging kind of object placed on induction heating cooker

Country Status (4)

Country Link
JP (1) JP2895821B2 (en)
KR (1) KR100186424B1 (en)
CN (1) CN1135907C (en)
TW (1) TW342575B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1816226B (en) * 2004-11-15 2011-05-04 株式会社东芝 Inductance heating cooking appliance
CN110169721A (en) * 2018-02-21 2019-08-27 达仕康电机株式会社 Cooking device
WO2024131189A1 (en) * 2022-12-22 2024-06-27 佛山市顺德区美的电热电器制造有限公司 Pot detection circuit and method, power control circuit and method, and wireless heating apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1816226B (en) * 2004-11-15 2011-05-04 株式会社东芝 Inductance heating cooking appliance
CN110169721A (en) * 2018-02-21 2019-08-27 达仕康电机株式会社 Cooking device
WO2024131189A1 (en) * 2022-12-22 2024-06-27 佛山市顺德区美的电热电器制造有限公司 Pot detection circuit and method, power control circuit and method, and wireless heating apparatus

Also Published As

Publication number Publication date
KR100186424B1 (en) 1999-05-15
KR980007844A (en) 1998-03-30
CN1135907C (en) 2004-01-21
TW342575B (en) 1998-10-11
JPH1055880A (en) 1998-02-24
JP2895821B2 (en) 1999-05-24

Similar Documents

Publication Publication Date Title
CN1143606C (en) Ballast circuit
CN100342638C (en) Method of detecting motor current and motor control device
CN101557194A (en) Motor driving apparatus
CN1187062A (en) Power source apparatus
CN1167361A (en) Operation device for linear compressor
CN1064378A (en) Ac motor drive system
RU99113351A (en) ENERGY CONVERSION DEVICE AND AIR CONDITIONER USING THIS DEVICE
CN1135907C (en) Apparatus and method for judging kind of object placed on induction heating cooker
CN1277487A (en) Electric source device, method and electronic apparatus
CN109067178A (en) A kind of control system and method for same phase buck-boost converter mode smooth switching
CN1882202A (en) Induction type heating cooker
CN1669366A (en) Driver for a gas discharge lamp
CN100413194C (en) Method for controlling DC-DC converter
CA2523738A1 (en) Lamp operating circuit and operating method for a lamp having active current measurement
CN101841945A (en) Electromagnetic induction heating device
CN1092778C (en) Microwave oven with induction heating function
CN101316076B (en) Output current control method of inverter
CN110324921A (en) Induction heating apparatus and its drive control method
CN1309460A (en) Halogen lamp power supply converter with complementary switch
CN1104750A (en) Induction heating cooker
EP0605330A2 (en) Structure of a static frequency converter
CN111342568B (en) Series-parallel resonance convertible wireless charging transmitting circuit and control method
CN1233726A (en) Magnetron driving control apparatus of microwave oven and method thereof
CN216117854U (en) Automatic detection device of converter
CN1857039A (en) Power converter with digital signal processor

Legal Events

Date Code Title Description
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C06 Publication
PB01 Publication
C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20040121