CN100569030C - Induction heating cooking instrument - Google Patents
Induction heating cooking instrument Download PDFInfo
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- CN100569030C CN100569030C CN 200610153442 CN200610153442A CN100569030C CN 100569030 C CN100569030 C CN 100569030C CN 200610153442 CN200610153442 CN 200610153442 CN 200610153442 A CN200610153442 A CN 200610153442A CN 100569030 C CN100569030 C CN 100569030C
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- bridge structure
- inverter circuit
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- 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
Abstract
Do not make to produce overcurrent etc. in the inverter circuit, carry out suitable load judgment.Induction heating cooking instrument of the present invention has power subsystem; Inverter circuit; The input current detecting unit of power subsystem; The inverter current detecting unit; According to the input of described input current detecting unit and inverter current detecting unit, detect the load condition detecting unit of load condition; Detect the voltage detection unit of the input voltage of described power subsystem; And control the output voltage of described power subsystem and the control unit of described inverter circuit at least, inverter circuit is for switching to the structure of half-bridge structure or full bridge structure, control unit is according to the output of load condition detecting unit and be input to the setting power that is heated metallic object, switch to the action of half-bridge structure or full bridge structure, when the energising beginning, inverter circuit is switched to half-bridge structure.
Description
Technical field
The present invention relates to heat the Poewr control method of usefulness as the metal pan that is heated metallic object (load) of induction heating cooking instrument.
Background technology
Induction heating cooking instrument, make be configured near the heater coil that flows through high-frequency current, produce vortex flow in the metal pan (load) of metallic object as being heated, by its Joule heat, metal pan (load) heating itself, thus can be expeditiously to metal pan (load) heat, in recent years, with respect to heating and cooking appliance based on stove or electrothermal heater, because fail safe and the controlled advantage of temperature constantly replace them.
In such induction heating cooking instrument, the power control circuit that is used to make high-frequency current in heater coil, to flow, be called so-called resonance-type inverters, generally be that the inductance that will contain the heater coil that is heated metallic object links to each other with resonant capacitor, the switch element of power control circuit carried out the structure of conducting (ON) disconnection (OFF) control with the driving frequency about 20～40kHz.In addition, voltage resonance type and current-resonance type are arranged in the resonance-type inverters, in most cases, the former is applied to the 100V power supply, and the latter is applied to the 200V power supply.
At first, be merely able to add the metallic object that is heated of hot iron equimagnetic material, but in recent years, also can heat with what non-magnetic stainless steel etc. was made and be heated metallic object.Also proposed and to be heated scheme that metallic object heats to the aluminum that can not heat non magnetic in the past.
In the induction heating cooking instrument that has used this resonance-type inverters, to being heated under the situation that metallic object heats, judging by being heated inductance (inductance L of equal value) that metallic object and heater coil determine and resistive component (resistance R of equal value) the commute heat generation that helps to heat and impact.Promptly show, under the situation that is heated the metal that metallic object is a magnetic (iron or magnetic stainless steel etc.), be easy to input power; Under the situation that is nonmagnetic metal (non-magnetic stainless steel or aluminium, copper etc.), be difficult to input power.This be because, the value of latter's resistance R of equal value is little, the vortex flow of inducting in being heated metallic object is difficult to produce Joule heat.
Therefore, the number of turn of heater coil is fixed (single heater coil), can input power nonmagnetic be heated in the metallic object, but in the heated object of magnetic, be difficult to input power, at this problem, following scheme has been proposed, promptly, detecting under the nonmagnetic situation that is heated metallic object, make the inverter circuit structure become half-bridge (half bridge) structure, detecting under the situation that is heated metallic object of magnetic, it is being switched to full-bridge (full bridge) structure (for example, with reference to patent documentation 1).
[patent documentation 1] spy opens flat 5-251172 communique
Summary of the invention
But, in above-mentioned prior art, the fixing number of turn of heater coil (single heater coil), when being magnetic or non magnetic, when the inverter circuit structure is switched to full-bridge circuit structure or half-bridge circuit structure, be that characteristic is present under the situation that is heated metallic object in zone in the middle of it according to being heated metallic object, there are the following problems, that is, be switched to inappropriate inverter circuit and be energized, the efficiency of heating surface worsens and inverter circuit is caused damage.
In addition, even if use single heater coil, switch the inverter circuit structure, under the bigger situation of the impedance of the load of inverter circuit, have following situation, promptly, electric current is difficult to flow through the heater coil as load, is subjected to the influence of the buffer condenser that links to each other with the switch element of inverter circuit, and the loss of switch element increases, load is imported under the lower powered situation, influence increases.Promptly, under the bigger situation of the impedance of load, there are the following problems in the control of low power section, the flow through ratio of switch element of the charging and discharging currents of residual electric charge increases on the buffer condenser, because excessive electric current flows through switch element, the loss of switch element increases, because temperature rises, the reliability of switch element worsens, and the expense that the cooling of switch element is relevant increases, and becomes the main cause that cost rises.
In addition, because the charging and discharging currents of buffer condenser, be consumed as the power of the heating that is helpless to be heated metallic object, so the efficiency of heating surface descends.
In addition, make the structure of inverter circuit become the judgement that half-bridge structure still becomes full bridge structure, the user must carry out when beginning to switch on, but be not described about this method, when being used to judge the energising of load, following problem arranged with inappropriate circuit structure, promptly, produce unusual big curtage, on the element that constitutes inverter circuit, apply overload, become the reason of fault.
The present invention is at least one and the invention made in addressing the above problem.
Make the present invention for addressing the above problem, it has: the power subsystem of output dc voltage; Via described power subsystem, high-frequency current flow to the series resonant circuit that is made of resonant capacitor and heater coil, makes to be configured near the being heated described heater coil and to produce vortex flow in the metallic object, the inverter circuit that heats; Detect the input current detecting unit of the input current of described power subsystem; Detect the inverter current detecting unit of the electric current that flows in the described series resonant circuit; According to the input of described input current detecting unit and inverter current detecting unit, detect the load condition detecting unit of the state of load; Detect the voltage detection unit of the input voltage of described power subsystem; With the output voltage of the described at least power subsystem of control and the control unit of described inverter circuit, described inverter circuit becomes the structure that can switch to half-bridge structure or full bridge structure to described series resonant circuit, described control unit, according to the output of described load condition detecting unit be input to the setting power that is heated metallic object, carry out described inverter circuit is switched to the action of half-bridge structure or full bridge structure, when the energising beginning, described inverter circuit is switched to half-bridge structure.
Induction heating cooking instrument of the present invention, by constituting as described above, when the energising beginning, inverter circuit with half-bridge structure carries out the energising that load condition is judged usefulness, compare with the situation of the inverter circuit of full bridge structure, the overcurrent or the overvoltage that produce under the situations such as load, particularly low-impedance load energising not clear to impedance can reduce significantly.
In addition, owing to can carry out suitable load judgment, therefore, can control the pressure that the element that constitutes inverter circuit is given very little.
In addition, by carrying out suitable load judgment in when beginning energising, can suppress overcurrent generation caused makes a noise, therefore, can eliminate the misoperation or the flase drop survey of product itself, and can reduce obstruction broadcast receiver or television set etc.
Description of drawings
Fig. 1 is the major part circuit block diagram of expression one embodiment of the invention.
Fig. 2 is the figure of action of the load condition detecting unit of explanation one embodiment of the invention.
Fig. 3 is the action specification figure of the half-bridge structure of one embodiment of the invention.
Fig. 4 is the action specification figure of the full bridge structure of one embodiment of the invention.
Fig. 5 is the flow chart of the load judgment action of explanation one embodiment of the invention.
Symbol description
3 power subsystems, 4 heater coils, 5,7 resonant capacitors, 10 input current detecting units, 11 voltage detection units, 13 inverter current detecting units, 14 load condition detecting units, 50 inverter circuits, 51 series resonant circuits, 300 control units
Embodiment
Below, one embodiment of the invention are described with reference to the accompanying drawings.Fig. 1 is the circuit block diagram of explanation one embodiment of the invention.In the drawings, with rectification unit 2 with AC power 1 direct currentization, by power subsystem 3 output can to the effective voltage of AC power set height, stabilisation DC power supply voltage substantially.
In the switch portion 100, be connected with damper diode 103,104 respectively with the concatermer inverse parallel of switch element 101,102 ground.In addition, as required, buffer condenser 105,106 is linked to each other with each switch element 101,102 respectively.With the center of the concatermer of switch element 101,102, link to each other with a end as the series resonant circuit 51 (concatermer of heater coil 4 and resonant capacitor 5 or resonant capacitor 7) of load.Switch portion 200 also is the structure identical with switch portion 100.
The circuit structure of inverter circuit 50 in order to adopt the two structure of half-bridge structure (comprising the SEPP circuit structure) and full bridge structure, switches the destination that is connected as the series resonant circuit 51 of load with transfer relay 6 and transfer relay 8.
Particularly,, will be connected the reference potential side of the mid point and the power subsystem 3 of switch portion 100, become the inverter circuit structure of half-bridge structure (or SEPP) type as the series resonant circuit 51 of load by connecting transfer relay 6, cutting off transfer relay 8.High-voltage side as if transfer relay 6 promptly being connected power subsystem 3 also connects resonant capacitor 5, then constitutes half-bridge structure.In SEPP and half-bridge structure, basic action is identical, the circuit structure of therefore following explanation SEPP.
By alternately, driving switch element 101 and 102 individually, the high-frequency current of vibration frequency with driving frequency of switch element 101,102 is flowed through as the series resonant circuit 51 of load.
In order to constitute full bridge structure, cut off transfer relay 6, connect transfer relay 8, will link to each other with the mid point of the concatermer of the switch element 201,202 of switch portion 200 as the series resonant circuit 51 of load.And, by alternately, driving switch element 101 and 202 and 102 and 201 combination individually, the high-frequency current with frequency of driving frequency is flowed through as the series resonant circuit 51 of load.
Load condition detecting unit 14, input according to input current detecting unit 10 and inverter current detecting unit 13, infer the material be heated metallic object or shape etc., particularly, the two input according to above-mentioned input current detecting unit 10 and inverter current detecting unit 13, the state of judging the load of inverter circuit 50 is high impedance or Low ESR, perhaps, and the height state of the resonance frequency of the load of judgement inverter circuit 50.Judge its result in a plurality of stages, export control unit 300 to.
Phase difference detection unit 17 detects the phase difference of inverter current with respect to the driving timing (timing) of switch element 101,102,201,202.In order to make inverter current not become leading phase and carry out this detection with respect to the driving timing of switch element 101,102,201,202, the drive signal that the output of input inverter current detecting unit 13 and control unit 300 are exported to switch element 101,102,201,202, under the situation below the phase difference of regulation, produce detection signal, export control unit 300 to.
Inverter current reduces with respect to the phase difference of the driving timing of switch element 101,102,201,202, be because the resonance frequency of the load of the driving frequency of switch element 101,102,201,202 and inverter circuit 50 is approaching, when control unit 300 detects this signal, by the frequency setting of the drive signal of switch element 101,102,201,202 must can be avoided than set value height.
When switch element 101,102,201,202 driving timing is when the phase difference of regulation is following, produce following situation, situation about having changed according to the loading condition of inverter circuit 50 (being heated metallic object) with respect to variation of the relative position of heater coil 4 etc., switch element 101,102,201,202 driving frequency is consistent with the resonance frequency of the load of inverter circuit 50, perhaps switch element 101,102,201,202 driving frequency is lower, might produce overcurrent, or produce above switch element 101,102,201,202 withstand voltage voltage causes switch element 101,102,201, the fault of 202 damages and inverter circuit 50.
As common action, as a certain circuit structure in full-bridge or the half-bridge, drive inverter circuit 50, according to the output of load condition detecting unit 14, control unit 300 is selected the structure of inverter circuit 50, continues to drive.
Fig. 2 is the figure of the action of explanation load condition detecting unit 14.In the drawings, transverse axis is the output of input current detecting unit 10, and the longitudinal axis is the output of inverter current detecting unit 13.And utilized, the combination of the output of the output of input current detecting unit 10 and inverter current detecting unit 13 changes according to the state of load.Particularly, be converted to digital value, be used as address information by each output voltage that will import with AD converter, can be for two inputs, the state of load is taken out as data.
For example, the regional A of Fig. 2 is that iron or magnetic stainless steel (SUS430) etc. is suitable for the characteristic that metallic object shows that is heated of induction heating most.As magnetic, because existence resistivity to a certain degree so the flux that heater coil 4 is produced is easy to concentrate, produces expeditiously vortex flow, makes self-heating.Resistance components of equal value in the load impedance of inverter circuit 50 is big, so can obtain more high-power with less inverter current.
Area B is represented, by the characteristic of the situation that is heated metallic object non-magnetic stainless steel formations such as (SUS304), that thickness of slab approaches.Under the situation of non-magnetic stainless steel, the flux that heater coil 4 is produced does not concentrate on the bottom of a pan, and since the resistivity of material itself lower (be about iron 1/4th), the transmission efficiency reduction of energy.But by the thickness of slab in the attenuate the bottom of a pan, the resistance components of the eddy current path of generation increases, therefore, though,, then be the zone of abundant heating if increase inverter current not as regional A.
Zone C is represented, by the characteristic under the situations that are heated metallic object that constitute, that thickness of slab is thicker such as non-magnetic stainless steel.Different with the load of area B, because the resistance components of eddy current path is lower, therefore, must make more inverter current flow through fully heating.
Region D is, nonmagneticly is heated metallic object, particularly used the situation that is heated metallic object of lower aluminium of resistivity or copper, and must flow through bigger inverter current than zone C could generate heat.
For example, being heated in the metallic object of high impedance, inverter current is difficult to flow, and is higher but the resistance of equal value of the load of inverter circuit 50 also tends to, and therefore, with respect to less inverter current, flows through bigger input current.Inverter current is I if make, and resistance components of equal value is R in the load impedance of inverter circuit 50, then is transfused to the power W that is heated metallic object, when ignoring the loss of heater coil 4 middle generations own, can use W=I
2* R represents.
In addition, this power W reaches maximum when the high-frequency current by the resonance frequency that capacity determined of load impedance and resonant capacitor 5,7 flows through.Resonance frequency, if to make the inductance composition in the load impedance be L, the resonant capacitor capacity is C, then as shown in the formula.
[mathematical expression 1]
Therefore, in high impedance load, even the resistance value of equal value of same levels, if inductance difference of equal value, resonance frequency difference then is so the electric current of the heater coil 4 of flowing through changes according to the inverter frequency that drives.
Similarly, in low-impedance load, be subjected to the original non magnetic peculiar lower inductive impact of equal value of metallic object that is heated, resonance frequency increases.
For the metallic object that is heated among the heating region D, need to improve the load impedance of inverter circuit 50.As its method, there is the number of turn that increases heater coil 4, improve and the magnetic couplings that is heated metallic object, increase the method for resistance of equal value and inductance of equal value; And with the frequency of inverter current (20～40kHz) are increased to high-frequency band (60～90kHz) method from the low frequency band that is suitable for regional A.
According to the combination of above-mentioned method had practicability product, but the maximal input or the efficiency of heating surface do not reach iron or the stainless degree of magnetic.
As mentioned above, according to the combination of input current and inverter current, can infer the impedance of the load of inverter circuit 50 to a certain extent.In addition, by also setting, can infer the height of load impedance of inverter circuit 50 and the height of resonance frequency in conjunction with the driving frequency of control unit 300.
Fig. 3 represent inverter circuit 50 each bridge construction schematic diagram and apply state for the voltage of load.
Fig. 3 (a) is the inverter circuit structure of SEPP (Single Ended Push Pull), between the reference potential of the mid point of switch portion 100 and power subsystem 3, is connected with the load that heater coil 4 and resonant capacitor 5 constitute.In addition, when two polyphone ground of resonant capacitor 5,5a being linked to each other with power subsystem 3 and when mid point is connected heater coil 4, then become half-bridge structure, even but the SEPP circuit, basic action is also identical.
Fig. 3 (b) expression, in the circuit of Fig. 3 (a), the switch element 101,102 of upper and lower bridge arm repeatedly alternately under the conducting situation about disconnecting, apply state for the voltage of load.Wherein, in this figure, omit and prevent that sky (blank) time that the short circuit between upper and lower bridge arm is used from describing.
Waveform A represents the conducting off-state of the switch element 101 of brachium pontis, and waveform B is represented the conducting off-state of the switch element 102 of brachium pontis down.
When last brachium pontis conducting,, be applied to former state on the X terminal of load the supply voltage that is applied on the inverter circuit 50.The Y terminal of load links to each other with reference potential, so load therebetween has been applied in supply voltage E.
Next, when last brachium pontis disconnection, following brachium pontis conducting, the X terminal becomes the state that links to each other with reference potential, becomes the state that from the X terminal Y terminal is not applied voltage.
After this, repeat this two states, so shown in waveform C, the voltage that applies on the X terminal of load and the Y terminal is alternately applied E and 0.
Fig. 4 (a) is the inverter circuit structure of full bridge structure, at the mid point of switch portion 100 and the mid point of switch portion 200, is connected with the load that heater coil 4 and resonant capacitor 7 constitute.
Fig. 4 (b) expression, in the circuit of Fig. 4 (a), the switch element 101,102,201,202 of upper and lower bridge arm repeatedly alternately under the conducting situation about disconnecting, apply state for the voltage of load.Wherein, in this figure, omit and prevent that the empty time that the short circuit between each upper and lower bridge arm is used from describing.
Waveform D represents, the conducting off-state of the switch element 101,202 of the last brachium pontis of switch portion 100 and the following brachium pontis of switch portion 200, and waveform E represents the conducting off-state of switch element 102,201 of the last brachium pontis of the following brachium pontis of switch portion 100 and switch portion 200.And the conducting state of waveform D is state f, and the conducting state of waveform E is state g.
In state f,, be applied to former state on the X terminal of load the supply voltage E that is applied on the inverter circuit 50.The Y terminal of load links to each other with reference potential, and therefore, load therebetween has been applied in supply voltage E.
Next, in state g, the X terminal is in the state that links to each other with reference potential, becomes the state that has applied supply voltage E on the Y terminal.
Therefore after this, become this two states repeatedly, shown in waveform F, be applied to the X terminal of load and the voltage on the Y terminal, alternately be applied in E and-E.
Like this, in the inverter circuit 50 of full bridge structure, inverter circuit 50 with respect to half-bridge structure, under the state that same power supplies voltage is applied on the inverter circuit 50, and with the same terms driving switch element 101,102,201,202 o'clock, the voltage that is applied in the load is equivalent to 2 times, and the input power of this moment becomes 4 times.
Therefore, by changing the inverter circuit structure, the electrorheological of flow through load and switch element 101,102,201,202 is big.
Usually, in the load of high impedance such as iron or magnetic stainless steel or low resonant frequency,, also can realize sufficient self-heating even do not increase the electric current that flows in the heater coil 4.But, as the load of nonmagnetic metal, under the situation of shared low-impedance load and heater coil 4, the coil turn of heater coil 4 is increased, improve the magnetic couplings degree, but on the contrary, for high impedance load, in order to make impedance become higher, must improve the supply voltage that is applied on the inverter current 50.
Therefore, the inverter circuit 50 of full bridge structure becomes effectively, can handle multiple load with a heater coil 4.
Wherein, under the situation that the 50 pairs of low-impedance loads of inverter circuit with full bridge structure drive, may flow through very large electric current,, become the inducement that element heating that constitutes inverter circuit 50 or the element fault that overvoltage causes produce because overload or loss increase.
As existing induction heating cooking instrument, if be fixed with certain inverter circuit structure, then in order to handle each load, can preestablish supply voltage or inverter driving dynamic frequency, but, in order to carry out the processing of wide region as described above, must make bigger electric current flow through the element that constitutes inverter circuit 50.For example, with respect to magnetic, in the load of nonmagnetic material, obtain under the situation of identical heats, in order to make the resistance of equal value that helps to heat below 1/20, must flow through the electric current more than 5 times, the shape of switch element 101,102,201,202 and resonant capacitor 5,7 etc. becomes very big, and loss is also big, considers that cost is unpractical.
Therefore, in having certain induction heating cooking instrument of inverter circuit 50 of state of obtaining half-bridge structure and full bridge structure, the energising of the load judgment when being used to switch on beginning can be undertaken by the inverter circuit of half-bridge structure.
This be because, if half-bridge structure, although then the impedance of load is not clear, under the situation of switching on, inverter with respect to full bridge structure, the voltage that is applied in the load relatively becomes half, and the generation main cause that unusual electric current flows through or loss increases caused fault reduces significantly.
In addition,, suitable load judgment can be carried out, the inverter circuit structure that is used for heating expeditiously can be selected in the stage at energising initial stage by carrying out such load judgment energising.
Fig. 5 is the flow chart of the action of explanation load judgment.When indicating the heating of load to begin, carry out following action by user's operation.
In step 501, control unit 300 is set at half-bridge structure with inverter circuit 50.In step 502, the output of the voltage of power subsystem 3 is set at the voltage that load judgment uses and sets the inverter driving dynamic frequency.In step 503, the action of beginning inverter circuit 50.In step 504, behind official hour, check the output of load condition detecting unit 14, being judged as under the situation that load is high impedance or low resonant frequency, carry out the processing of step 506.In step 506,, go forward side by side and work if the target power that the user sets then is set at the inverter circuit 50 of the half-bridge structure of step 507a at low power section.In step 506,, go forward side by side and work if the target power that the user sets then is set at the inverter circuit 50 of the full bridge structure of step 507b in high power region.In step 504, being judged as under the situation that load is Low ESR or high resonance frequency, carry out the processing of step 507c, be set at the inverter circuit 50 of half-bridge structure, go forward side by side and work.
In addition, in step 501 and 502, be set under the situation of half-bridge structure, the transfer relay 6,8 among Fig. 1 and the combination of switch portion 200 become following a certain.With transfer relay 6 conductings, transfer relay 8 is disconnected, switch element 202 is disconnected.Perhaps, transfer relay 6 is disconnected, with transfer relay 8 conductings, with switch element 202 conductings.
Be judged as by load condition detecting unit 14 in the load of high impedance or low resonant frequency, under the situation of low-power settings, become half-bridge structure, this be because, if be low-power originally, also be the power region that can heat then by half-bridge structure, can set the inverter driving dynamic frequency lower, reduce so can seek the switching loss of switch element.
Like this, when the energising beginning, inverter circuit 50 with half-bridge structure carries out the energising that load condition is judged usefulness, compare with the situation of the inverter circuit 50 of full bridge structure, the overcurrent or the overvoltage that produce under the situations such as load, particularly low-impedance load energising not clear to impedance can reduce significantly.
In addition, owing to can carry out suitable load judgment, so, can control the pressure that the element that constitutes inverter circuit 50 is given very little.
In addition, by carrying out suitable load judgment in when beginning energising, that can suppress that the generation of overcurrent causes makes a noise, and therefore, can eliminate the misoperation or the flase drop survey of product itself, and can reduce the obstruction to broadcast receiver or television set etc.
Claims (1)
1. induction heating cooking instrument has:
The power subsystem of output dc voltage;
Make high-frequency current flow through the series resonant circuit that constitutes by resonant capacitor and heater coil via described power subsystem, make to be configured near the being heated described heater coil and to produce vortex flow in the metallic object, the inverter circuit that heats;
Detect the input current detecting unit of the input current of described power subsystem;
The flow through inverter current detecting unit of electric current of described series resonant circuit of detection;
According to the input of described input current detecting unit and inverter current detecting unit, detect the load condition detecting unit of the state of load;
Detect the voltage detection unit of the input voltage of described power subsystem; And
At least control driving frequency, and the described control unit that is heated the power of metallic object of control input of the output voltage of described power subsystem and described inverter circuit,
Described inverter circuit, can switch to half-bridge structure or full bridge structure with respect to described series resonant circuit, described heater coil is connected with first resonant capacitor when switching to half-bridge structure, described heater coil is connected with second resonant capacitor that is different from described first resonant capacitor when switching to full bridge structure, when switching to half-bridge structure or full bridge structure, can make the volume change of described resonant capacitor thus
Described control unit, be heated the setting power of metallic object according to the output of described load condition detecting unit and input, carry out described inverter circuit is switched to the action of half-bridge structure or full bridge structure, when the heating of described heater coil begins, described inverter circuit is switched to half-bridge structure, carry out the energising when described load condition detecting unit detects load condition.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005269376 | 2005-09-16 | ||
| JP2005269376A JP4521337B2 (en) | 2005-09-16 | 2005-09-16 | Induction heating cooker |
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| CN1937863A CN1937863A (en) | 2007-03-28 |
| CN100569030C true CN100569030C (en) | 2009-12-09 |
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| CN 200610153442 Expired - Fee Related CN100569030C (en) | 2005-09-16 | 2006-09-15 | Induction heating cooking instrument |
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| JP4193095B2 (en) * | 2001-11-08 | 2008-12-10 | 三菱電機株式会社 | Induction heating cooker |
| JP2003324956A (en) * | 2002-05-09 | 2003-11-14 | Origin Electric Co Ltd | Method of controlling series resonant bridge inverter circuit and the circuit |
| JP4258737B2 (en) * | 2005-01-24 | 2009-04-30 | 三菱電機株式会社 | Induction heating cooker and induction heating cooking method |
| JP4310293B2 (en) * | 2005-05-30 | 2009-08-05 | 日立アプライアンス株式会社 | Induction heating device |
| JP4310292B2 (en) * | 2005-05-30 | 2009-08-05 | 日立アプライアンス株式会社 | Induction heating device |
-
2005
- 2005-09-16 JP JP2005269376A patent/JP4521337B2/en not_active Expired - Fee Related
-
2006
- 2006-09-15 CN CN 200610153442 patent/CN100569030C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007080751A (en) | 2007-03-29 |
| CN1937863A (en) | 2007-03-28 |
| JP4521337B2 (en) | 2010-08-11 |
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| C14 | Grant of patent or utility model | ||
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Address after: Tokyo, Japan Patentee after: Hitachi Global Living Program Co.,Ltd. Address before: Tokyo, Japan Patentee before: Hitachi Appliances, Inc. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091209 |