CN1279376A - Heating cooker - Google Patents
Heating cooker Download PDFInfo
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- CN1279376A CN1279376A CN00108179A CN00108179A CN1279376A CN 1279376 A CN1279376 A CN 1279376A CN 00108179 A CN00108179 A CN 00108179A CN 00108179 A CN00108179 A CN 00108179A CN 1279376 A CN1279376 A CN 1279376A
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- current
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- voltage
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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
- H05B6/64—Heating using microwaves
- H05B6/66—Circuits
- H05B6/68—Circuits for monitoring or control
- H05B6/681—Circuits comprising an inverter, a boost transformer and a magnetron
- H05B6/682—Circuits comprising an inverter, a boost transformer and a magnetron wherein the switching control is based on measurements of electrical values of the 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
- H05B6/64—Heating using microwaves
- H05B6/6447—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors
- H05B6/645—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors using temperature sensors
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
- Induction Heating Cooking Devices (AREA)
- Electric Ovens (AREA)
Abstract
This invention is to perform a control based on the sensing result in a stable condition by heightening the sensing accuracy of a current sensing means and a voltage sensing means. A current of known level is sensed by a current sensing circuit 32 through a current transformer 31 while the input voltage of known level is sensed by a voltage sensing circuit 34 through a step-down transformer 17, and at the stage before product shipment, the sensing values of current and voltage are stored in a non-volatile memory 38 as the reference current value and reference voltage value, respectively. A control unit 36 calculates the current and voltage values sensed by the current sensing circuit and the voltage sensing circuit, respectively, during the cooking operation on the basis of the stored reference values. At this time of calculation, the power supply frequency sensed by a frequency signal generating circuit 35 and the temp. sensed by a temp. sensing circuit 37 are taken into account.
Description
The present invention relates to have the heating device of the heater means that the mains ac power supply drives.
In heating device, provide the load output variable control (containing power on/off control) and the overcurrent protection control of heater means etc. according to the electric current of detections such as current transformer, in addition, also in vogue by detecting power supply voltage variation, the output of control heater means.But with current detecting means and voltage detecting means in the past, this detection electric current and detection voltage unavoidably can change because of circuit parameter changes in time, thereby are difficult to correctly detect.
In recent years, in for example electronic range (microwave oven),, require to improve it as far as possible and add thermal output (high frequency output) for improving cooking speed.At this moment, family's distribution socket and circuit breaker capacity are set at 15A usually, thereby the maximum rated current of setting electronic range is the big as far as possible state that is no more than in this value scope.But, in fact, because of its sizes of input current of electronic ranges such as the change of supply voltage and environment temperature variation changes thereupon, thereby above-mentioned maximum rated current sets the value (for example about 13A) of reserving abundant surplus with respect to 15A for, and this becomes and hinders one of reason that cooking speed improves.In order to handle this situation, consider to detect input current, when this input current has surplus, by the output of control increase heater meanses such as inverter circuit by above-mentioned current detecting means.But, as mentioned above, be difficult to carry out carry out very difficulty of this control under the situation of correct current detecting action in the current detecting means, add thermal output thereby can not fully improve.
The present invention In view of the foregoing makes, and its 1st purpose is to provide a kind of heating device, can improve the accuracy of detection of current detecting means, can detect electric current according to this and control in stable state.Its 2nd purpose is to provide a kind of heating device, except that the accuracy of detection that can improve the current detecting means, also can improve the accuracy of detection of mains ac power supply input voltage, can detect electric current and detect voltage according to this, carries out stable control.
In order to reach above-mentioned the 1st purpose, a kind of heating device of the application's the 1st invention, it has to be driven by the mains ac power supply cooks the heater means of action; This cooking device also comprises: the current detecting means that detect the electric current that flows through predetermined position; The storage means that detected value when described current detecting means are detected the known level electric current is stored in advance as reference current value; Calculate the current operator means of the current value that the current detecting means detect described in the cooking action according to the reference current value of storing in the described storage means.
According to this formation, even changing in time because of circuit parameter when making the current detecting means detect in the cooking action current value be irregular situation, also the reference current value that can store in advance according to the storage means (detected value when promptly these current detecting means detect known level electric current) calculates the current value that the current detecting means detect, thereby can improve the accuracy of detection of current detecting means and control under stable state according to this detection electric current.
In the application's the 2nd invention, described current detecting means and storage means are configured on same substrate or the not segregative polylith substrate.
According to this formation, have not only in the heating device assembling procedure, and when for example substrate is made, check in the operation, also can be to the advantage of storage means Memory Reference current value, the situation of storing when assembling with heating device or when repair changing is compared, and the storage operation of reference current value is easy to carry out.When in current detecting means and storage means one or both produce fault, only changing these parts can finish, needn't be when repairing replacing, carry out the operation of Memory Reference current value, promptly needn't need to produce the operation of this trouble of device of scheduled current, be easy to carry out thereby repair to change.
The heating device of the application the 3rd invention constitutes signalization generation means, produces the frequency signal of expression mains ac power supply frequency, and in the storage means supply frequency information of Memory Reference current value when detecting this reference current value in advance; In cooking action, the supply frequency information that supply frequency of representing when described frequency signal and described storage means are stored is not simultaneously, described current operator means, when calculating the current value of described current detecting means detection according to the reference current value of storing in the described storage means, different these factors of additional supply frequency are revised.
Constitute according to this, as the mains ac power supply frequency (50Hz or 60Hz) of heating device power supply when variant, the current sense function that also can correct execution current detecting means and the calculation function of current operator means.
The heating device of the application's the 4th invention, constitute signalization generation means, produce the frequency signal of expression mains ac power supply frequency, and each current value when the current detecting means are detected the known level electric current of different electrical power frequency respectively is stored in advance in the storage means as the reference current value with supply frequency information corresponding states; Described current operator means according to the corresponding reference current value of representing with described frequency signal in the reference current value of described storage means stored of supply frequency information, are calculated in the cooking action current value that described current detecting means detect.
According to this formation, same with above-mentioned the 3rd invention, even when the frequency of mains ac power supply is variant, but the also calculation function of the current sense function of correct execution current detecting means and current operator means.
The heating device of the application's the 5th invention also comprises the temperature detection means that detect current detecting means lay down location ambient temperature; When described current operator means, the reference current value of storing in according to the storage means are calculated the current value that the current detecting means detect in the cooking action, this factor of temperature that additional described temperature detection means detect.
According to this formation, can prevent that the current detecting means from detecting after, make incorrect this situation of detection current value that the current operator means calculate in possible trouble because of ambient temperature changes.
In order to reach above-mentioned the 2nd purpose, a kind of heating device of the application's the 6th invention, it has to be driven by the mains ac power supply cooks the heater means of action; This cooking device also comprises: the current detecting means that detect the electric current that flows through predetermined position; Detection is from the voltage detecting means of the input voltage of described mains ac power supply; The storage means that detected value when detected value when described current detecting means are detected the known level electric current and described voltage detecting means detect the known level input voltage is stored in advance as reference current value and reference voltage value respectively; Calculate the current operator means of the current value that the current detecting means detect described in the cooking action according to the reference current value of storing in the described storage means; Calculate the voltage operational means of the input voltage value that the voltage detecting means detect described in the cooking action according to the reference voltage value of storing in the described storage means.
According to this formation, even when changing the input voltage value that the current detecting means detect in the cooking action current value and voltage detecting means are detected in time and be irregular state because of the circuit parameter value, also can calculate the current value and the input voltage value of current detecting means and the detection of voltage detecting means according to reference current value of storing in the storage means and reference voltage value (each detected value when promptly these current detecting means and voltage detecting means detect known level electric current and voltage respectively), thereby can improve the accuracy of detection of current detecting means and voltage detecting means and according to this detection electric current with detect voltage, control in stable state.
In the heating device of the application's the 7th invention, described current detecting means, voltage detecting means and storage means are configured on same substrate or the not segregative polylith substrate.
According to this formation, have not only in the heating device assembling procedure, and when for example substrate is made, check in the operation, also can be to the advantage of storage means Memory Reference current value and reference voltage value, the situation of storing when assembling with heating device or when repair changing is compared, and the storage operation of reference current value and reference voltage value is easy to carry out.When one or more in current detecting means, voltage detecting means and storage means produces fault, only changing these parts can finish, needn't be when repairing replacing, carry out the operation of Memory Reference current value and reference voltage value, promptly needn't need to produce the operation of this trouble of device of scheduled current, be easy to carry out thereby repair to change.
The heating device of the application's the 8th invention, constitute signalization generation means, produce the frequency signal of expression mains ac power supply frequency, and in the storage means supply frequency information when Memory Reference current value and reference voltage value and this reference current value of detection and reference voltage value in advance; In cooking action, the supply frequency information that supply frequency of representing when described frequency signal and described storage means are stored is not simultaneously, described current operator means and voltage operational means, when calculating current value that described current detecting means and voltage detecting means detect and input voltage value according to the reference current value of storing in the described storage means and reference voltage value, different these factors of additional supply frequency are revised.
According to this formation, as the mains ac power supply frequency (50Hz or 60Hz) of heating device power supply when variant, current sense function, the voltage detecting function of voltage detecting means and the calculation function of current operator means that also can correct execution current detecting means.
The heating device of the application's the 9th invention, constitute signalization generation means, produce the frequency signal of expression mains ac power supply frequency, and each detected value when current detecting means and voltage detecting means are detected the known level electric current of different electrical power frequency and input voltage respectively is stored in advance in the storage means as reference current value and reference voltage value with supply frequency information corresponding states; Described current operator means and voltage operational means, according to corresponding reference current value and the reference voltage value of representing with described frequency signal in the reference current value of described storage means stored and the reference voltage value of supply frequency information, calculate in the cooking action current value and input voltage value that described current detecting means and voltage detecting means detect.
According to this formation, same with above-mentioned the 8th invention, even when the frequency of mains ac power supply is variant, but the also calculation function of the voltage detecting function of the current sense function of correct execution current detecting means, voltage detecting means and current operator means and voltage operational means.
The heating device of the application's the 10th invention also comprises the temperature detection means that detect current detecting means and voltage detecting means lay down location ambient temperature; Described current operator means and voltage operational means, when current value that current detecting means and voltage detecting means detect in reference current value of storing in according to the storage means and the reference voltage value calculating cooking action and input voltage value, this factor of temperature of additional described temperature detection means detection.
According to this formation, can prevent in advance that the current detecting means from detecting after, detection current value that the current operator means are calculated and voltage detecting means detect the detection magnitude of voltage that back voltage operational means are calculated, because of ambient temperature changes the incorrect situation that makes it to become.
The heating device of the application's the 11st invention when at least one is not stored in the storage means in reference current value and reference voltage value, forbids cooking the action of action or specific load.Constitute according to this,, forbid cooking the action of action or specific load, thereby can prevent that these actions from sinking into the abnormal operation situation in possible trouble making because of reasons such as unit failures can not store as the value of current detecting and voltage detecting benchmark the time.
The heating device of the application's the 12nd invention, when at least one is not stored in the storage means in reference current value and reference voltage value, the notification action of being scheduled to.Constitute according to this,, carry out the confirmation of the reservation action, thereby can anticipate unusual cooking action making because of reasons such as unit failures can not store as the value of current detection value and voltage detecting value the time.
The heating device of the application the 13rd invention also comprises, the current value and the input voltage value that calculate according to current operator means and voltage operational means are no more than at total input current that the control input power is the control device of steady state value in the scope of higher limit.Constitute according to this, can control, make total input current be no more than higher limit, thereby can under the state of the total input current of restriction, improve cooking speed according to the correct current value and the input voltage value of current operator means and the calculating of voltage operational means.
In the heating device of the application's the 14th invention, described voltage operational means are added the function according to the input voltage value of the on off operating mode correction voltage detecting means detection of heater means and other load.Constitute according to this,, also can finally obtain correct detection magnitude of voltage even when for example in cooking action, stopping action and make the input voltage change because of the load beyond the heater means.
The heating device of the application's the 15th invention, described storage means constitute with the non-volatile manner that also can keep memory contents when power supply is blocked.Constitute according to this, do not worry that almost reference current value and the reference voltage value stored in the storage means disappear, thereby improve the reliability that detects current value or detect magnitude of voltage.
The heating device of the application's the 16th invention, described current detecting means detect the electric current that flows through from the input current of mains ac power supply or the specific load.Constitute according to this, can correctly detect the input current that the total input current of heating device or each load flow through separately.
Fig. 1 is the electric pie graph of one embodiment of the invention.
Fig. 2 is the major part circuit diagram.
Fig. 3 is the curve chart of expression converter primary side input current and primary side output voltage relation.
Fig. 4 is the temperature characteristics figure of current transformer output.
Fig. 5 is the overall stereogram that constitutes.
Among the figure: the 9th, heater, the 13rd, the mains ac power supply, the 17th, step-down transformer, the 26th, motor, the 29th, supply unit, the 30th, magnetron (heater means), the 31st, converter, the 32nd, current detection circuit (current detecting means), the 33rd, constant voltage power supply circuit, the 34th, voltage detecting circuit (voltage detecting means), the 35th, frequency signal generating circuit (signal generation means), the 36th, control unit (current operator means, voltage operational means, control device), the 37th, temperature sensing circuit (temperature detection means), the 38th, nonvolatile memory (storage means).
Hereinafter, with reference to accompanying drawing, illustrate that the present invention is used for an embodiment of electronic range.
At first, in Fig. 5 of expression electronic range summary outward appearance, housing 1 is the rectangular box bodily form of front openings, and portion forms the cooking room 2 of the rectangular vessel shape of front openings within it, simultaneously, be rotatably mounted the door 3 of the peristome that is used to open and close cooking room 2 at front surface.
In housing 1, abut to form Machine Room (not shown) with the side of cooking room 2, in this Machine Room, hold magnetron described later (be equivalent to heater means, among Fig. 1 with label 30 expression) and be used for driving the supply unit (Fig. 1 is with label 29 expressions) of magnetron.On the forward position of the Machine Room of housing 1, setting operation panel 4 sets starting switch 5, the automatic-cooking switch 6 corresponding with multiple cooking menu that the cooking begins usefulness, sets the led board 8 that time set timer 7, demonstration cooking information and temporal information that the cooking time uses are used on this guidance panel 4.
Baking, roasting culinary heater 9 are set at the top of cooking room 2.Circular swivel plate 10 is set in the bottom of cooking room 2.These swivel plate 10 its formations are, apply enamel on the electric conducting material surface of for example steel plate and so on and handle, and especially when electronic range cook, placement circular cooking device dish (not shown) on swivel plate 10.This cooking device dish is made of the microwave penetration material of glass, pottery and so on.
The electric formation of electronic range represented in summary in Fig. 1, below this is illustrated.
Among Fig. 1, from the mains ac power supply 13,, between a pair of power line 11,12, provide the alternating voltage of preset frequency (50Hz or 60Hz) through fuse 14, noise filter 15 and thermal switch 16.At the elementary winding 17a of 11,12 connection step-down transformers 17 of two power lines, simultaneously, connect the series circuit of fan electromotor 18 and relay switch 19.It is indoor that said fans motor 18 is configured in not shown mechanism, cools off the Air Blast fan (not shown) that mechanical chamber interior electric component is used with the driving condition running.
Article one, the door switch 20 of power line 11 series connection of connecting when door 3 is closed is connected power line 11a with 21, and another power line 12 connects power line 12a through main relay switch 22.The door switch 23 that between the common junction of above-mentioned door switch 20 and 21 and power line 12, has been connected the short switch effect.This door switch 23 constitutes when door 3 is opened and connects.
Between power line 11a, 12a, connect the series circuit of series circuit, relay switch 27 and heater 9 that cooking device 2 illuminating indoor lamps 24, relay switch 25 and swivel plate 10 drive the motor 26 of usefulness respectively.
The supply unit 29 that is connected between power line 11a, the 12a through relay switch 28 is used for providing the resonance power supply to magnetron 30, though not concrete diagram, it comprises known formations such as rectifier smoothing circuit, inverter circuit, step-up transformer, high-voltage capacitor, high-voltage diode.
Current transformer 31 is set on power line 12, and the primary side output of this current transformer 31 offers current detection circuit 32 (being equivalent to the current detecting means).On the secondary coil 17 of above-mentioned step-down transformer 17, connect constant voltage power supply circuit 33, voltage detecting circuit 34 (being equivalent to the voltage detecting means), frequency signal generating circuit 35 (being equivalent to signal generation means).These current transformers 31, current detection circuit 32, constant voltage power supply circuit 33, voltage detecting circuit 34, frequency signal generating circuit 35 its formations are to be configured on the same substrate with nonvolatile memory 38 described later (being equivalent to the storage means), or are configured in by welding and wait connection but on the not segregative polylith substrate.
Above-mentioned current detection circuit 32, constant voltage power supply circuit 33, voltage detecting circuit 34 and frequency signal generating circuit 35, its physical circuit constitutes, for example as shown in Figure 2.
That is, current detection circuit 32 its formations comprise: to the secondary output of current transformer 31 carry out rectification circuit 31a that full-wave rectification uses, the charging of the output that is connected to this rectification circuit 31a is with resistance 31b and the series circuit (integrating circuit) of capacitor 31c, the discharge resistance 31d in parallel with this series circuit.Thereby, in the current detection circuit 32, present the current detection signal Iin that adapts of current values of voltage level and 13 inputs from the mains ac power supply at the two ends of capacitor 31c, this current detection signal Iin offers control unit 36 (being equivalent to current operator means, voltage operational means, control device).
Constant voltage power supply circuit 33 comprise to the alternating current that provides through secondary coil 17b carry out the centre cap form of full-wave rectification rectification circuit 33a, make this rectification output smoothing capacitor 33b, receive this level and smooth output constant voltage circuit 33c, be used to stablize the capacitor 33d of this constant voltage output, its output provides to control unit 36 as control power supply, and offers other circuit unit through power supply terminal+VCC.
Frequency signal generating circuit comprise emitter connect power supply terminal+VCC and collector electrode through the resistance 35c of the end of the PnP transistor npn npn 35b of resistance 35a ground connection, the substrate that connects this transistor 35b and secondary coil 17b, be connected the resistance 35d of the usefulness of setovering between emitter and substrate.In the frequency signal generating circuit 35 of this formation, produce the pulse duration frequency signal Ps that the frequency of cycle and mains ac power supply 13 adapts from the collector electrode of transistor 35b, this pulse signal Ps provides to control unit 36 as the signal of the frequency of representing mains ac power supply 13.
Be back to Fig. 1, its formation of temperature sensing circuit 37 (being equivalent to the temperature detection means) comprises and disposes for example thermistor, to detect the ambient temperature of current detection circuit 32 and voltage detecting means 34 placements, the temperature detection signal Vt that voltage level and this detected temperatures adapt offers control unit 36.
In the nonvolatile memory 38, before product export,, store reference current value described later and reference voltage value to have the state of corresponding relation with supply frequency information, its constitute make can and 36 of control units carry out reading and writing data.
Except that to control unit 36 input above-mentioned current detection signal Iin, voltage detection signal Vin, pulse signal Ps, temperature detection signal Vt, also input comprises the operation signal of the operational means 39 of above-mentioned starting switch 5, automatic-cooking switch 6, time set timer 7.
Particularly, carrying out the electronic range cooking device by magnetron 30, control unit 36 is according to reaching from the represented input voltage value of the voltage detection signal Vin of voltage detecting circuit 34 from the represented input current value of the current detection signal Iin of current detection circuit 32, through inverter circuit (not shown), the output of magnetron 30 is increased and decreased control as described later.At this moment, control unit 36, according to the frequency signal Ps of the storage data in the non-volatile memory 38, frequency signal generating circuit 35 outputs and the temperature detection signal Vt of temperature sensing circuit 37 outputs, the input current value that the current detection signal Iin of modification and 32 outputs of calculating current detection circuit represents and the voltage detection signal Vin of voltage detecting circuit 34 outputs represent input voltage value, below, to being illustrated with the formation of calculating the action associated.
As mentioned above, in the nonvolatile memory 38, before product export, to have the state of corresponding relation, Memory Reference current value and reference voltage value with supply frequency information.
At this moment, the storage operation of reference current value carries out as follows.At first, under the substrate assembled state of the current transformer 31 of packing at least on the substrate, current detection circuit 32 and nonvolatile memory 38, cross the alternating current of known level in the primary flow of current transformer 31.Particularly, for example, under the state that applies the 98.5V/60Hz alternating voltage, flow through the 14.3A electric current in the resistive load, at this moment, the current value (voltage level by current detection signal Iin is represented) that current detection circuit 32 is detected is stored in the nonvolatile memory 38 as the reference current value that quantizes state.Meanwhile, the supply frequency information that is 60Hz of corresponding storage representation supply frequency with this reference current value.
The storage operation of reference voltage value carries out as follows.At first, under the substrate assembled state of the step-down transformer 17 of packing at least on the substrate, constant voltage power supply circuit 33, voltage detecting circuit 34, frequency signal generating circuit 35 and nonvolatile storage 38, the elementary alternating voltage that applies known level to step-down transformer 17, simultaneously, make the predetermined load action.Particularly, for example apply the 98.5V/60Hz alternating voltage, under this state, make relay switch 19,22,25,28 (being the load of operate condition simultaneously) action with magnetron 30 actions, at this moment, the magnitude of voltage (voltage level of voltage detection signal Vin is represented) that detects with voltage detecting circuit 34 is stored in the memory 38 as the reference voltage value that quantizes state.Meanwhile, with the corresponding relation of last and this reference voltage value, the storage representation supply frequency is the supply frequency information of 60Hz.As mentioned above, making relay switch 19,22,25,28 action is when adapting to the electronic range cooking, and along with these load actions, step-down transformer 17 load currents increase, the phenomenon that its output voltage reduces.
But, in electronic range cooking action, when being in that input current that current detection circuit 32 detects has surplus and during the low state of the input voltage (supply voltage) that voltage detecting circuit 34 detects, control unit 36 makes it to increase through the output of inverter circuit control magnetron 30, up to predetermined level, this control is carried out according to the input current and the input voltage of above-mentioned detection, thereby be no more than in the scope of 15A (corresponding to home-use distribution socket and circuit breaker capacity) at total input current, improve the output (and then improving cooking speed) of magnetron 30 to greatest extent.
At this moment, according to present embodiment, control unit 36 is controlled, and calculates the represented current value of current detection signal Iin of current detection circuit 32 outputs with the reference current value (current value when current detection circuit 32 detects the known level electric current) according to storage in the nonvolatile memory 38; Simultaneously, the represented input voltage value of voltage detection signal Vin of the reference voltage value of being stored according to nonvolatile memory 38 (magnitude of voltage when voltage detecting circuit 34 detects the voltage of known level) calculating voltage testing circuit 34 outputs.Thus, even because of reasons such as circuit parameter change in time, when the input voltage value that input current value that current detection circuit 32 detects and voltage detecting circuit 34 detect is irregular status, control by aforementioned calculation, also can improve the accuracy of detection of current detection circuit 32 and voltage detecting circuit 34, thereby can detect electric current according to these controls with detection voltage, that is, under stable state, control the output that (for example in 14.6A ± 0.2A scope) improves magnetron 30 to greatest extent in the scope that makes total input current be no more than higher limit (being 15A).
In a word, can under the situation of the total input current of restriction, improve cooking speed.
As shown in Figure 3, in the required current transformer 31 of output current detection signal Iin, exist its elementary input current and the relation of secondary output voltage can be along with the different and discrepant situations of supply frequency.In the required step-down transformer 17 of voltage sense signal Vin, also there is same situation, the relation of its elementary input voltage and secondary output voltage can be different and variant along with supply frequency.
In order to handle this situation, control unit 36 judges that according to the frequency signal Ps of frequency signal generating circuit 35 outputs supply frequency is 50Hz or 60Hz, the supply frequency information of being stored in judged result and non-volatile memory 38 (being " 60Hz " in the present embodiment) is not simultaneously, when calculating the represented input voltage value of the represented input current value of above-mentioned current detection signal Iin and voltage detection signal Vin according to the reference current value of this nonvolatile memory stores and reference voltage value, the difference of additional this supply frequency is revised (the elementary input current of additional current transformer 31 as shown in Figure 3 and the relation of secondary output voltage and the elementary input voltage of step-down transformer 17 and the relation of secondary output voltage are revised).
The result, even the also detection electric current of the voltage detecting function of the current sense function of correct execution current detection circuit 32, voltage detecting circuit 34 and control unit 36 and detect the calculation function of voltage all the time as the frequency (50Hz or 60Hz) of the mains ac power supply 13 of electronic range power supply not simultaneously.
On the other hand, as shown in Figure 4, in current transformer 31, the situation that exists its output meeting to change along with the environment temperature height.In order to handle this situation, control unit 36, temperature detection signal Vt according to temperature sensing circuit 37 outputs, when the reference current value of foundation nonvolatile memory 38 storage and reference voltage value calculated the represented input voltage value of the represented input current value of above-mentioned current detection signal Iin and above-mentioned voltage detection signal Vin, the additional represented temperature of this temperature detection signal Vt was revised (the output temperature characteristic of current transformer 31 additional shown in Figure 4 is revised).
The result, the detection current value that the represented current value of exporting according to the reference current value calculating current detection circuit 32 of nonvolatile memory 38 storages of current detection signal Iin obtains, can prevent in advance that more stable status is controlled the output of above-mentioned magnetron 30 because of ambient temperature changes the error that produces.
In the present embodiment, above-mentioned current detection circuit 32, voltage detecting circuit 34 and nonvolatile memory 38 are configured on the same substrate or on the not segregative polylith substrate, thereby has a following advantage: not only when the electronic range assembling procedure, and all can carry out the operation of Memory Reference current value and reference voltage value respectively in the inspection operation when for example substrate is made to non-volatile memory 38.As a result, the occasion that just can carry out during with the electronic range assembling procedure or when repair changing is compared, and it is easy that the storage operation of reference current value and reference voltage value becomes.When in current detection circuit 32, voltage detecting circuit 34 and nonvolatile memory 38, producing fault in arbitrary or two above means, only changing these parts can finish, thereby when repairing replacing, do not need the operation of Memory Reference current value and reference voltage value, promptly do not need to prepare the operation of this trouble of device of generation scheduled current and voltage, be easy to carry out thereby repair to change.
Be stored in dump and also can keep in the non-volatile memory 38 of memory contents even above-mentioned formation is reference current value and reference voltage value, therefore almost do not worry just in case the reference current value and the reference voltage value of storage can disappear, the result is to improve the reliability of the current value of current detection circuit 32 detections or the magnitude of voltage calculating action that voltage detecting means 34 detect.
The invention is not restricted to the foregoing description, it can do following distortion and expansion.
Forbid carrying out the controlled function that electronic range cooking action or specific load (for example magnetron 30) are moved when can not be stored in the non-volatile memory 38 to additional at least one when reference current value and reference voltage value of control unit 36.According to this formation, in the time can not storing because of reasons such as unit failures, forbid the action of electronic range cooking action or specific load, thereby have and to prevent in advance that these actions from sinking into the advantage of abnormal operation state as the value of current detecting and voltage detecting benchmark.
The controlled function of carrying out the confirmation of the reservation action by for example LED panel 8 in the time of can being increased in that at least one is not stored in the nonvolatile memory 38 in reference current value and the reference voltage value to control unit 36.According to this formation, in the time can not storing because of reasons such as unit failures as the value of current detection value and voltage detecting value benchmark, the notification action that can be scheduled to, thereby can anticipate the situation of cooking action unusually.
Can be to the function of the additional input voltage value that detects according to the on off operating mode correction voltage detecting circuit 34 of magnetron 30 and other load (motor 26 etc.) of control unit 36.Constitute according to this,, also can finally obtain correct detection voltage even the load beyond the magnetron 30 moves when stopping to make the input voltage change in for example the cooking is moved.
In the above-described embodiments, its formation is a nonvolatile memory 38 being the electric current of known level of 60Hz and reference current value that voltage obtains and reference voltage value according to frequency with the expression supply frequency is that the supply frequency information of 60Hz is stored, in addition, also can constitute, be the supply frequency that detects by current detection circuit 32 and voltage detecting circuit 34 respectively the detected value of the various occasions of the electric current of known level of 50Hz and voltage, as being that the reference current value and the reference voltage value of the corresponding state of the supply frequency information of 50Hz stored with the expression supply frequency.At this moment, current value and magnitude of voltage that control unit 36 detects according to reference current value and reference voltage value correcting current testing circuit 32 and voltage detecting circuit 34, this reference current value and reference voltage value are corresponding with the represented supply frequency information of the frequency signal Ps of frequency signal generating circuit 35 outputs in the reference current value of nonvolatile memory 38 stored and the reference voltage value.
Though its formation is by the total input current of current detection circuit 32 detected electrons kitchen ranges in the present embodiment, also can constitutes and detect the electric current that flows through specific load (for example magnetron 30).
In order to control the output of magnetron 30, present embodiment constitute the current detection signal Iin that utilizes current detection circuit 32 output and voltage detection signal Vin both, but also can utilize current detection signal Iin to control at least, thereby voltage detecting circuit 34 can be provided with as required.Frequency signal generating circuit 35 and temperature sensing circuit 37 also can be provided with as required.
In the present embodiment, carry out the storage operation of reference current value and reference voltage value in the substrate assembling stage, but also can finally the stage of finishing is carried out storage operation at product.At this moment, the supply voltage that applies must add from the product supply socket to step-down transformer the pressure drop the 17 elementary paths.
In the above-described embodiments, the present invention is applied to have the electronic range of cooking function, but the invention is not restricted to this, for example also can be used for electronics cooking special machine.In the above-described embodiments, as heater means, illustration magnetron 30, but also heater 9 can be other heater meanses such as load coil and Halogen lamp LED.
As mentioned above as can be known, in the heating device of the present invention, its formation is, detected value when detecting the electric current of known level according to the current detecting means calculates the current value that the current detecting means detect in the cooking action, thereby can improve the accuracy of detection of current detecting means, can control with stable state according to detecting electric current.Except that the calculation function of above-mentioned detection electric current, formation of the present invention is that the detected value when detecting known level voltage according to the voltage detecting means calculates the magnitude of voltage that the voltage detecting means detect in the cooking action, thereby except that the accuracy of detection that can improve the current detecting means, also can improve accuracy of detection, detect electric current according to these and can control in stable state with detection voltage from the input voltage of mains ac power supply.
Claims (16)
1. heating device, it has to be driven by the mains ac power supply cooks the heater means of action; It is characterized in that this cooking device also comprises:
The current detecting means of the electric current of predetermined position are flow through in detection;
The storage means that detected value when described current detecting means are detected the known level electric current is stored in advance as reference current value;
Calculate the current operator means of the current value that the current detecting means detect described in the cooking action according to the reference current value of storing in the described storage means.
2. heating device as claimed in claim 1 is characterized in that, described current detecting means and storage means are configured on same substrate or the not segregative polylith substrate.
3. heating device as claimed in claim 1, it is characterized in that, constitute signalization generation means, produce the frequency signal of expression mains ac power supply frequency, and in the storage means supply frequency information of Memory Reference current value when detecting this reference current value in advance; In cooking action, the supply frequency information that supply frequency of representing when described frequency signal and described storage means are stored is not simultaneously, described current operator means, when calculating the current value of described current detecting means detection according to the reference current value of storing in the described storage means, different these factors of additional supply frequency are revised.
4. heating device as claimed in claim 1, it is characterized in that, constitute signalization generation means, produce the frequency signal of expression mains ac power supply frequency, and each current value when the current detecting means are detected the known level electric current of different electrical power frequency respectively is stored in advance in the storage means as the reference current value with supply frequency information corresponding states; Described current operator means according to the corresponding reference current value of representing with described frequency signal in the reference current value of described storage means stored of supply frequency information, are calculated in the cooking action current value that described current detecting means detect.
5. heating device as claimed in claim 1 is characterized in that, this cooking device also comprises the temperature detection means that detect current detecting means lay down location ambient temperature; When described current operator means, the reference current value of storing in according to the storage means are calculated the current value that the current detecting means detect in the cooking action, this factor of temperature that additional described temperature detection means detect.
6. heating device, it has to be driven by the mains ac power supply cooks the heater means of action; It is characterized in that this cooking device also comprises:
The current detecting means of the electric current of predetermined position are flow through in detection;
Detection is from the voltage detecting means of the input voltage of described mains ac power supply;
The storage means that detected value when detected value when described current detecting means are detected the known level electric current and described voltage detecting means detect the known level input voltage is stored in advance as reference current value and reference voltage value respectively;
Calculate the current operator means of the current value that the current detecting means detect described in the cooking action according to the reference current value of storing in the described storage means;
Calculate the voltage operational means of the input voltage value that the voltage detecting means detect described in the cooking action according to the reference voltage value of storing in the described storage means.
7. heating device as claimed in claim 6 is characterized in that, described current detecting means, voltage detecting means and storage means are configured on same substrate or the not segregative polylith substrate.
8. heating device as claimed in claim 6, it is characterized in that, constitute signalization generation means, produce the frequency signal of expression mains ac power supply frequency, and in the storage means supply frequency information when Memory Reference current value and reference voltage value and this reference current value of detection and reference voltage value in advance; In cooking action, the supply frequency information that supply frequency of representing when described frequency signal and described storage means are stored is not simultaneously, described current operator means and voltage operational means, when calculating current value that described current detecting means and voltage detecting means detect and input voltage value according to the reference current value of storing in the described storage means and reference voltage value, different these factors of additional supply frequency are revised.
9. heating device as claimed in claim 6, it is characterized in that, constitute signalization generation means, produce the frequency signal of expression mains ac power supply frequency, and each detected value when current detecting means and voltage detecting means are detected the known level electric current of different electrical power frequency and input voltage respectively is stored in advance in the storage means as reference current value and reference voltage value with supply frequency information corresponding states; Described current operator means and voltage operational means, according to corresponding reference current value and the reference voltage value of representing with described frequency signal in the reference current value of described storage means stored and the reference voltage value of supply frequency information, calculate in the cooking action current value and input voltage value that described current detecting means and voltage detecting means detect.
10. heating device as claimed in claim 6 is characterized in that, this cooking device also comprises the temperature detection means that detect current detecting means and voltage detecting means lay down location ambient temperature; Described current operator means and voltage operational means, when current value that current detecting means and voltage detecting means detect in reference current value of storing in according to the storage means and the reference voltage value calculating cooking action and input voltage value, this factor of temperature of additional described temperature detection means detection.
11. heating device as claimed in claim 6 is characterized in that, when at least one is not stored in the storage means in reference current value and reference voltage value, forbids cooking the action of action or specific load.
12. heating device as claimed in claim 6 is characterized in that, when at least one is not stored in the storage means in reference current value and reference voltage value, and the notification action of being scheduled to.
13. heating device as claimed in claim 1, it is characterized in that, this cooking device also comprises, the current value and the input voltage value that calculate according to current operator means and voltage operational means are no more than at total input current that the control input power is the control device of steady state value in the scope of higher limit.
14. heating device as claimed in claim 6 is characterized in that, described voltage operational means are added the function according to the input voltage value of the on off operating mode correction voltage detecting means detection of heater means and other load.
15. heating device as claimed in claim 1 is characterized in that, described storage means constitute with the non-volatile manner that also can keep memory contents when power supply is blocked.
16. heating device as claimed in claim 1 is characterized in that, described current detecting means detect the electric current that flows through from the input current of mains ac power supply or the specific load.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP185014/1999 | 1999-06-30 | ||
| JP185014/99 | 1999-06-30 | ||
| JP18501499A JP3735491B2 (en) | 1999-06-30 | 1999-06-30 | Cooker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1279376A true CN1279376A (en) | 2001-01-10 |
| CN100353118C CN100353118C (en) | 2007-12-05 |
Family
ID=16163269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001081799A Expired - Lifetime CN100353118C (en) | 1999-06-30 | 2000-04-27 | Heating cooker |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP3735491B2 (en) |
| KR (1) | KR100401684B1 (en) |
| CN (1) | CN100353118C (en) |
| TW (1) | TW460677B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158998A (en) * | 2010-02-11 | 2011-08-17 | 威林斯株式会社 | Intelligent inductive heater having judging function for normal load and driving method thereof |
| CN103813556A (en) * | 2014-02-17 | 2014-05-21 | 美的集团股份有限公司 | Electromagnetic heating device and power control method and power control system thereof |
| US10433376B2 (en) | 2013-05-21 | 2019-10-01 | Goji Limited | Calibration of an RF processing system |
| CN110461193A (en) * | 2017-04-06 | 2019-11-15 | 三菱电机株式会社 | Electromagnetic induction heating cooker |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100803773B1 (en) * | 2006-10-26 | 2008-02-15 | 엘지전자 주식회사 | Cooking device |
| KR101110789B1 (en) * | 2010-04-09 | 2012-02-24 | 쿠쿠전자주식회사 | Malfunction detecting apparatus of heater in induction heating cooker |
| JP6690079B2 (en) * | 2016-05-24 | 2020-04-28 | 東芝ホームテクノ株式会社 | Heating cooker |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR910006172B1 (en) * | 1987-07-06 | 1991-08-16 | 마쯔시다덴기산교 가부시기가이샤 | Controlling device for electric apparatus |
| JP2643430B2 (en) * | 1989-04-10 | 1997-08-20 | 松下電器産業株式会社 | Induction heating cooker |
| GB2239330B (en) * | 1989-11-28 | 1994-06-22 | Toshiba Kk | Microwave oven and heating cooking appliance |
| JPH03173357A (en) * | 1989-11-30 | 1991-07-26 | Toshiba Corp | Controlling method for power of inverter |
| JPH0495386A (en) * | 1990-07-31 | 1992-03-27 | Toshiba Corp | High frequency heating cooking device |
| KR940005058B1 (en) * | 1992-02-14 | 1994-06-10 | 삼성전자 주식회사 | Out-put circuit and method of microwave oven |
| JPH0676941A (en) * | 1992-08-25 | 1994-03-18 | Sanyo Electric Co Ltd | Microwave oven |
| JP3202111B2 (en) * | 1993-10-13 | 2001-08-27 | 株式会社日立ホームテック | High frequency heating equipment |
| JP3168842B2 (en) * | 1994-09-28 | 2001-05-21 | 松下電器産業株式会社 | High frequency heating equipment |
| JPH10208857A (en) * | 1997-01-29 | 1998-08-07 | Hitachi Home Tec Ltd | Induction heating cooker |
-
1999
- 1999-06-30 JP JP18501499A patent/JP3735491B2/en not_active Expired - Lifetime
-
2000
- 2000-03-13 TW TW089104517A patent/TW460677B/en not_active IP Right Cessation
- 2000-04-27 CN CNB001081799A patent/CN100353118C/en not_active Expired - Lifetime
- 2000-05-19 KR KR10-2000-0026907A patent/KR100401684B1/en active IP Right Grant
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158998A (en) * | 2010-02-11 | 2011-08-17 | 威林斯株式会社 | Intelligent inductive heater having judging function for normal load and driving method thereof |
| US10433376B2 (en) | 2013-05-21 | 2019-10-01 | Goji Limited | Calibration of an RF processing system |
| US11330680B2 (en) | 2013-05-21 | 2022-05-10 | Goji Limited | Calibration of an RF processing system |
| CN103813556A (en) * | 2014-02-17 | 2014-05-21 | 美的集团股份有限公司 | Electromagnetic heating device and power control method and power control system thereof |
| CN103813556B (en) * | 2014-02-17 | 2015-10-14 | 美的集团股份有限公司 | Electromagnetic heater and Poewr control method thereof and power control system |
| CN110461193A (en) * | 2017-04-06 | 2019-11-15 | 三菱电机株式会社 | Electromagnetic induction heating cooker |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20010007089A (en) | 2001-01-26 |
| JP2001015262A (en) | 2001-01-19 |
| JP3735491B2 (en) | 2006-01-18 |
| TW460677B (en) | 2001-10-21 |
| CN100353118C (en) | 2007-12-05 |
| KR100401684B1 (en) | 2003-10-17 |
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