JP3284830B2 - Induction heating cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction cooking device.

[0002]

2. Description of the Related Art Induction heating cookers, which induce and heat eddy currents at the bottom of a load pan by means of a high-frequency magnetic field, have attracted attention in recent years as clean, safe and efficient cooking means and have been gaining in popularity.

Hereinafter, a conventional induction heating cooker will be described with reference to FIGS. As shown in FIG. 16, 1 is a commercial power supply, 2 is a rectifier circuit that rectifies the commercial power supply 1 to DC, 3 is an inverter that converts DC to high-frequency current,
4 is a control circuit for controlling the output of the inverter 3 and the like, 5 is an output detection circuit for detecting the output of the inverter 3 based on the input current, 6 is a load (a frying pan in this embodiment), and 7 is a load 6
, A temperature detecting means 8 for detecting the temperature of the load 6 by a thermistor 8a attached to the lower surface of the load mounting table 7, and 9 storing a control temperature for preventing the temperature of the load 6 from rising excessively. The storage circuit 10 performs temperature control such as transmitting a heating stop signal to the control circuit when the temperature detected by the temperature detection means 8 exceeds the control temperature stored in the storage circuit. is there.

[0004] The operation of the induction heating cooker configured as described above will be described below. As shown in FIG. 17, first, in step 1, a heating start signal is transmitted from the temperature control means 10 to the control circuit 4, and the control circuit 4 transmits the heating start signal to the inverter 3.
To give a predetermined output to the load 6. Step 2
Then, heating is continued at a predetermined output. Then, in step 3, the temperature of the thermistor 8a is compared with the control temperature T1 stored in the storage circuit 9, and the temperature of the thermistor 8a is adjusted to the control temperature T.
If it is higher than 1, proceed to step 4 to stop heating,
If the temperature of the thermistor 8a is equal to or lower than the control temperature T1, the process shifts to step 2 to continue heating. In step 5, the temperature of the thermistor 8a is compared with the control temperature T2 stored in the storage circuit 9, and if the temperature of the thermistor 8a is equal to or higher than the control temperature T2, the process proceeds to step 4 and the heating is stopped to continue. If the temperature becomes lower than the control temperature T2, the process proceeds to step 1 and heating is started.

[0005]

However, in the above-mentioned conventional configuration, the temperature of the load 6 does not match the temperature of the thermistor 8a because of the presence of the load mounting table 7, as shown in FIG. Is higher. Then, when the temperature of the thermistor 8a first reaches the control temperature T1 from the start of heating, the temperature of the load 6 greatly overshoots. Therefore, when the control temperature T1 is set high, there is a problem that the temperature of the oil or the like in the load 6 becomes too high. But,
If the control temperature T1 is set low, the temperature of the load 6 is low, so that there is a problem that the cooking sound of the stir fry is not generated in the cooking of the stir fry and the cooking performance is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first object of the present invention is to appropriately suppress the maximum temperature of a load regardless of a set output and improve cooking performance.

It is a second object of the present invention to adjust the load temperature more precisely by finely adjusting the output, and to further improve the cooking performance.

It is a third object of the present invention to reduce the load on the storage circuit while maintaining fine output adjustment.

It is a fourth object of the present invention to realize temperature control that does not unnecessarily increase the temperature even when the load is small.

A fifth object is to realize a temperature control in which the intention of the operator is appropriately incorporated by setting the load temperature to a relatively low temperature when the set output is not the maximum output.

[0011]

In order to achieve the first object, the present invention provides an inverter for converting a commercial power supply into a high-frequency current, a control circuit for controlling an output of the inverter, and a temperature detecting means for detecting a temperature of a load. a temperature detecting means for an operation unit which sets the output of the inverter, detection by said temperature detecting means
The known temperature exceeds the control temperature 1 stored in the storage circuit
Stop or reduce the output of the inverter
And the temperature detected by the temperature detecting means
If the control temperature stored in the storage circuit drops below 2
Temperature control to increase the output of the inverter
Control means, and the storage circuit is set by the operation unit.
The control temperature 1 and the control temperature 2 corresponding to the output are stored .

In order to achieve the second object,
The present invention relates to an inverter for converting a commercial power supply to a high-frequency current, a control circuit for controlling an output of the inverter, a temperature detecting means for detecting a temperature of a load, and the temperature detecting means.
The detected temperature exceeds the control temperature 1 stored in the storage circuit
Stop or reduce the output of the inverter
And the temperature detected by the temperature detecting means is
When the control temperature stored in the storage circuit becomes 2 or less
Temperature controlled to increase the output of the inverter
Control means, wherein the storage circuit outputs the output of the inverter.
The control temperature 1 and the control temperature 2 corresponding to the force are stored .

Further, in order to achieve the third object,
The storage circuit of the present invention stores only the control temperature according to the output of the inverter which can be set by the operation unit, particularly , for setting the output of the inverter.

Further, in order to achieve the fourth object,
In particular, the temperature control means of the present invention stops the output of the inverter when the output of the inverter is equal to or less than a predetermined value and the temperature detected by the temperature detection means exceeds the control temperature 1 stored in the storage circuit. Control.

Further, in order to attain the fifth object, the temperature control means of the present invention, in particular, controls the output of the inverter.
Means for achieving the above-described second to fourth objects only when the maximum output that can be set by the operation unit to be set is set.
It is controlled by.

[0016]

According to the induction heating cooker of the present invention,
Control temperature 1 and control temperature according to the output set on the operation unit
2 is provided, the control temperature 1 decreases as the output of the inverter set by the operation unit increases.
And the control temperature 2 can be stored. Further, when the temperature detected by the temperature detecting means exceeds the control temperature 1 stored in the storage circuit, the output of the inverter is stopped or reduced, and the temperature detected by the temperature detecting means is stored in the storage circuit. Since the temperature control means for increasing the output of the inverter when the temperature becomes 2 or less is provided, the temperature control can be performed at the control temperature 1 and the control temperature 2 according to the output set by the operation unit, and the output is large. In some cases, temperature control can be performed at a low control temperature 1 and a low control temperature 2 .

Also, a control temperature corresponding to the output of the inverter
1 and the control temperature 2 are stored, so that the higher the output of the inverter, the lower the control temperature can be stored. When the temperature detected by the temperature detecting means exceeds the control temperature 1 stored in the storage circuit, the output of the inverter is reduced, and the temperature detected by the temperature detecting means becomes the control temperature 2 stored in the storage circuit. Temperature control means for increasing the output of the inverter when the temperature becomes below, so that the output of the inverter can be reduced as the temperature detected by the temperature detection means increases, and the temperature detected by the temperature detection means can be reduced. , The output of the inverter can be increased.

Further, since a storage circuit for storing the control temperature 1 and the control temperature 2 corresponding to the output which can be set in the operation section is provided, the control temperature becomes lower as the output of the inverter which can be set in the operation section becomes larger. 1 and the control temperature 2 can be stored. When the temperature detected by the temperature detecting means exceeds the control temperature 1 stored in the storage circuit, the output of the inverter is reduced by one step which can be set by the operation unit, and the temperature detected by the temperature detecting means is stored. Temperature control means for increasing the output of the inverter by one step which can be set by the operation unit when the control temperature stored in the circuit becomes equal to or lower than 2, so that the temperature detected by the temperature detection means is high. The output of the inverter can be reduced in an output stage that can be set by the operation unit as the temperature increases, and the output of the inverter can be increased in an output stage that can be set by the operation unit as the temperature detected by the temperature detection unit decreases. .

Also, when the output of the inverter is equal to or less than a predetermined value, the output of the inverter is stopped when the temperature detected by the temperature detecting means exceeds the control temperature 1 stored in the storage circuit. When the load is a small heat capacity load
Even if there is, the maximum temperature of the load 36 can be suppressed.
Wear.

Further, the temperature control according to any one of claims 2 to 4 is performed only when the maximum output which can be set by the operation unit is set.
And, in addition at maximum output setting, predetermined regardless of the set output
Control at control temperature 1 and control temperature 2
High temperatures can be controlled lower.

[0021]

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 1, reference numeral 11 denotes a commercial power supply,
Is a rectifier circuit that rectifies the commercial power supply 11 to DC, 13 is an inverter that converts DC to high-frequency current, 14 is a control circuit that controls the output of the inverter 13, 15 is an inverter 1
An output detection circuit for detecting the output of the load 3 by an input current; 16, a load (a frying pan in this embodiment); 17, a load table on which the load 16 is mounted; 18, a thermistor attached to the lower surface of the load table 17; 18a is a temperature detecting means for detecting the temperature of the load 16, 19 is a memory circuit for storing a control temperature for preventing the temperature of the load 16 from excessively rising, and 20 is a memory circuit for storing the temperature detected by the temperature detecting means 18 in the memory circuit 19. Temperature control means for performing temperature control such as transmitting a heating stop signal to the control circuit 14 when the stored control temperature is exceeded, and 21 is an operation section for setting the output of the inverter 13.

The operation of the induction cooking device configured as described above will be described below. The operation at the maximum setting output (2000 W in this embodiment) which can be set by the operation unit 21 will be described. First, as shown in FIG.
A heating start signal at 0 W is transmitted, the inverter 13 is operated by the control circuit 14, and an output of 2000 W is given to the load 16. In step 12, heating is continued at an output of 2000W. Then, in step 13, the temperature of the thermistor 18a is compared with the control temperature T11 which is the temperature condition of the heating stop according to 2000 W stored in the storage circuit 19, and if the temperature of the thermistor 18a is higher than the control temperature T11, the process proceeds to step 14. The process shifts to stop heating, and if the temperature of the thermistor 18a is equal to or lower than the control temperature T11, the process shifts to step 12 to continue heating. In step 15, the temperature of the thermistor 18a is compared with T11-2 ° C., which is 2 ° C. lower than the control temperature T11 which is the temperature condition of the heating recovery according to 2000 W stored in the storage circuit 19, and the temperature of the thermistor 18a is controlled to the control temperature T11. If the temperature is −2 ° C. or more, the process proceeds to step 14 to continue stopping the heating, and if the temperature of the thermistor 18a becomes lower than the control temperature T11-2 ° C., the process proceeds to step 11 to start heating. Further, as shown in FIG.
When the output set in step 1 is 1500 W, the control temperature of T12 and T12-2 ° C., which are higher than T11,
In the case of 000 W, the higher temperatures T13 and T1
Temperature control is performed at 3-2 ° C.

The output set by the operation unit 21 is 2000 W
The temperature change of the load 16 and the thermistor 18a at (FIG. 4A) and 1500 W (FIG. 4B) will be described. A load table 1 is provided between the load 16 and the thermistor 18a.
7, the temperature of the load 16 does not match the temperature of the thermistor 18a, and the temperature of the load 16 becomes higher as shown in FIG. The larger the output, the more the thermistor 18a and the load 1
The temperature difference of No. 6 increases. Then, first, the temperature of the thermistor 18a is changed to the control temperature T11 (or T1).
When the temperature reaches 2), the temperature of the load 16 overshoots.
It becomes larger than the overshoot of 0W. Output 200
Since the control temperature T11 at the time of 0 W is set lower than the control temperature T12 at the time of the output of 1500 W, the peak temperature of the overshoot of the output of 2000 W and the peak temperature of the overshoot of the output of 1500 W can be made substantially equal. . Further, the temperature of the thermistor 18a is controlled to the control temperature T1.
If the temperature is below 1-2 ° C (or T12-2 ° C), 200
The heating is restored at 0 W (or 1500 W), and then the heating is repeatedly started and stopped, and the temperature of the load 16 is stabilized. Since the control temperature T12 at the output of 1500 W is set higher than the control temperature T13 of 2000 W, the stable temperature of the load 16 can be higher at the output of 1500 W than at the output of 2000 W. You can cook without the sound disappearing.

As described above, according to this embodiment, the operation unit 2
The higher the output of the inverter 13 set in step 1, the lower the control temperature is stored in the storage circuit 19, and if the temperature of the thermistor 18a exceeds the control temperature corresponding to the output, the heating is stopped. The temperature can be suppressed, and the stable output of the load 16 can be increased by reducing the set output, so that the cooking performance of the stir-fry can be improved.

In this embodiment, the heating is stopped when the temperature of the thermistor 18a exceeds the control temperature 1 corresponding to each set output, and the heating is resumed when the temperature of the thermistor 18a falls below the control temperature 2.
The output may be reduced instead of stopping the heating, or the output may be increased instead of returning to the heating. Further, fuzzy control for increasing or decreasing the output according to the difference between the thermistor temperature and the control temperature and the amount of change in the thermistor temperature may be used together. Further, the control temperature 1 and the control temperature 2 are different, but may be the same temperature.

Embodiment 2 Hereinafter, a second embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 5, reference numeral 31 denotes a commercial power supply;
Is a rectifier circuit that rectifies the commercial power supply 31 to DC, 33 is an inverter that converts DC to high-frequency current, 34 is a control circuit that controls the output of the inverter 33, and 35 is an inverter 3
An output detection circuit for detecting the output of the load 3 by an input current, 36 is a load (a frying pan in this embodiment), 37 is a load mounting table on which the load 36 is mounted, and 38 is a thermistor attached to the lower surface of the load mounting table 37. A temperature detecting means 38a detects the temperature of the load 36, a storage circuit 39 stores a control temperature for preventing the temperature of the load 36 from rising excessively, and a storage circuit 39 stores the temperature detected by the temperature detecting means 38 in the storage circuit 39. Temperature control means for performing temperature control such as transmitting a signal for reducing a predetermined output to the control circuit 34 when the stored control temperature is exceeded.

The operation of the induction cooking device configured as described above will be described below. As shown in FIG. 6, first, at step 21, a heating start signal at 2000 W which is the maximum output is transmitted from the temperature control means 40 to the control circuit 34, and the control circuit 34 operates the inverter 33 to output the 2000 W output to the load 36. give. In step 22, heating is continued at a predetermined output (2000 W at first). Then, in step 23, the temperature of the thermistor 38a and the storage circuit 3
9, the control temperature T21 corresponding to 2000 W is compared. If the temperature of the thermistor 38a is higher than the control temperature T21, the process proceeds to step 24. If the temperature of the thermistor 38a is equal to or lower than the control temperature T21, the process proceeds to step 25. Transition. In step 24, the output is reduced by 200 W, and the process proceeds to step 22 to continue heating. In step 25, the temperature of the thermistor 38a is compared with the control temperature T21 stored in the storage circuit 39. If the temperature of the thermistor 38a becomes equal to or lower than the control temperature T21, the process proceeds to step 26, in which the temperature of the thermistor 38a becomes higher than the control temperature T21. If it is higher, the process proceeds to step 22. In step 26, the output is increased by 200 W, and the process proceeds to step 22 to continue heating. However,
When the maximum output is 2000 W, the output does not increase. That is, depending on the temperature of the thermistor 38a, the inverter 33
Is increased or decreased, and the temperature is controlled by operating on the solid line in FIG.

The temperature change at this time will be described with reference to FIG. Since there is a load mounting table 37 between the load 36 and the thermistor 38a, the temperature of the load 36 and the thermistor 38a
And the temperature of the load 36 becomes higher as shown in FIG. The larger the output, the greater the temperature difference between the thermistor 38a and the load 36. Then, when the temperature of the thermistor 38a first exceeds the control temperature T21 from the start of heating, the output is reduced by 200W and heating is continued at 1800W. Then, the temperature of the thermistor 38a is stored in the storage circuit 39.
The heating is continued at 1800 W until the temperature exceeds the control temperature T22 stored in the thermistor 38a, and the output is reduced by 200 W again when the temperature of the thermistor 38a exceeds the control temperature T22. Thereafter, the same operation is repeated, and when the temperature of the thermistor 38a reaches the control temperature T30 when the output is 200W, 0W, that is, heating is stopped. Conversely, when the temperature of the thermistor 38a decreases, for example, when the number of objects to be cooked of the load 36 increases, the output is sequentially increased by 200 W each time the temperature becomes equal to or lower than the control temperature corresponding to the output. . Therefore, it is possible to quickly reach the target temperature without overshooting the temperature of the load 36 as in the conventional example, it is possible to prevent the ignition of oil or the like, and to save the cook from changing the set output. It is possible to improve the cooking performance of the stir-fry without applying any heat.

As described above, according to the present embodiment, the higher the output of the inverter 33, the lower the control temperature, the lower the control temperature.
By increasing or decreasing the predetermined output according to the temperature of the thermistor 38a, the temperature of the load 36 can quickly reach the target temperature without overshooting, so that the cook takes time to change the set output. The cooking performance of the stir-fry can be improved without the need.

In this embodiment, the output at the start of heating is set to the maximum output. However, it goes without saying that the same effect can be obtained even if heating is started at an output lower than the maximum output.

Embodiment 3 Hereinafter, a third embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 9, reference numeral 31 denotes a commercial power supply;
Is a rectifier circuit that rectifies the commercial power supply 31 to DC, 33 is an inverter that converts DC to high-frequency current, 34 is a control circuit that controls the output of the inverter 33, and 35 is an inverter 3
An output detection circuit for detecting the output of the load 3 by an input current, 36 is a load (a frying pan in this embodiment), 37 is a load mounting table on which the load 36 is mounted, and 38 is a thermistor attached to the lower surface of the load mounting table 37. A temperature detecting means 38a detects the temperature of the load 36, a storage circuit 39 stores a control temperature for preventing the temperature of the load 36 from rising excessively, and a storage circuit 39 stores the temperature detected by the temperature detecting means 38 in the storage circuit 39. The control circuit 3 outputs a signal for reducing the output when the stored control temperature is exceeded.
Reference numeral 21 denotes an operation unit for setting an output of the inverter 33.

The operation of the induction cooking device configured as described above will be described below. The case where the maximum setting output 2000 W is set by the operation unit 31 will be described. As shown in FIG. 10, first, at step 31, the temperature control unit 40 sends the control circuit 34 to the control circuit 34 at the maximum setting output 2000 W set by the operation unit 21. A heating start signal is transmitted, the inverter 33 is operated by the control circuit 34, and 2
000W output. In step 32, heating is continued at a predetermined output (2000 W at first). Then, in step 33, the temperature of the thermistor 38a is compared with the control temperature (T11 at the time of starting heating with the set output 2000W) stored in the storage circuit 39, and if the temperature of the thermistor 38a is higher than the control temperature T11. If the temperature of the thermistor 38a is equal to or lower than the control temperature, the process proceeds to step 35. In step 34, the output is reduced to an output (1500 W in this embodiment) one set lower than the output that can be set by the operation unit 21, and the process proceeds to step 32 to continue heating. In step 35, the temperature of the thermistor 38a is compared with the control temperature T11 stored in the storage circuit 39,
If the temperature of the thermistor 38a is equal to or lower than the control temperature T11, the process proceeds to step 36. If the temperature of the thermistor 38a is higher than the control temperature T11, the process proceeds to step 32. In step 36, the output is set to one of the outputs that can be set by the operation section 21.
The output is increased to the set value, and the process proceeds to step 32 to continue heating. However, the output is not increased beyond the set output. In other words, the output of the inverter 33 is increased or decreased according to the temperature of the thermistor 38a, and the temperature is controlled by operating the solid line in FIG. Therefore, the temperature control is performed with the output increased and decreased more than in the second embodiment, so that the number of control temperatures stored in the storage circuit 39 is reduced, the capacity of the storage circuit 39 can be reduced, and an effect almost equivalent to that of the second embodiment can be obtained. Obtainable.

As described above, according to the present embodiment, as the output of the inverter 33 increases, the lower the control temperature, the lower the control temperature.
The capacity of the storage circuit 39 can be reduced and the temperature of the load 36 can be reduced by increasing and decreasing the temperature of the thermistor 38a by the output of the inverter 33 which can be set by the operation unit 21 according to the control temperature corresponding to the output. Since the target temperature can be quickly reached without overshooting, the cooking performance of the stir-fry can be improved without requiring the cook to change the set output.

In this embodiment, the heating start output set by the operation unit 21 is set to the maximum output. However, it goes without saying that the same effect can be obtained even if an output lower than the maximum output is set.

Embodiment 4 Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG. 5, FIG. 12, and FIG.

The main configuration is the same as that of the second embodiment. The difference in the operation is that the temperature control by the temperature control means 40 is performed as shown in FIG.
Steps 41 to 44 shown in FIG.
In the case where the output of No. 3 is lower than the predetermined output and exceeds the predetermined control temperature, the heating is stopped without reducing the output.

As shown in FIG. 12, steps 21 to 26 are the same as in the second embodiment, and the operation will be described focusing on steps 41 to 44. In step 41, the output of the inverter 33 is compared with a predetermined output (1000 W in this embodiment),
If it is smaller than 0 W, the process proceeds to step 42 and
If it is not less than 00W, the process proceeds to step 22. In step 42, the heating is stopped, and the process proceeds to step 43. In step 43, the temperature of the thermistor 38a is compared with a predetermined control temperature (T26 in this embodiment),
If the temperature of the thermistor 38a is higher than the control temperature T26, the process proceeds to step 42 to stop heating, and if the temperature of the thermistor 38a becomes equal to or lower than the control temperature T26, the process proceeds to step 44.
In step 44, heating is started at a predetermined output of 1000 W, and the process proceeds to step 22 to continue heating. That is, the temperature is controlled by increasing or decreasing the output of the inverter 33 in accordance with the temperature of the thermistor 38a and operating the solid line in FIG. Therefore, the operation is similar to that of the second embodiment. In addition, in a state where food is put in using a general frying pan as the load 36, the heat capacity of the load 36 and the food becomes large, and when the output of the inverter 33 is less than 1000W, the temperature rise of the load 36 and the food is small, The effect of the above control is reduced. Therefore, in the temperature control of the present embodiment, the second embodiment
The same effect can be obtained. Furthermore, since the control temperature is suppressed to T26 at the maximum, even when the load 36 has a small heat capacity, the maximum temperature of the load 36 can be suppressed, and safety can be further secured. .

As described above, according to the present embodiment, when the output of the inverter 33 is 1000 W and the temperature of the thermistor 38a exceeds T26, the output of the inverter 33 is stopped, so that the general load 36 In this case, the same effects as those of the second embodiment can be obtained, and in the case of the load 36 having a small heat capacity, the maximum temperature of the load 36 can be suppressed, and the safety can be further secured.

In this embodiment, when the output of the inverter 33 is 1000 W or more, the same temperature control as that of the second embodiment is performed. However, if the same temperature control as that of the third embodiment is performed, the same effect as that of the third embodiment can be obtained. Needless to say, 1000W
, The same effect can be obtained.

(Embodiment 5) Hereinafter, a fifth embodiment of the present invention will be described with reference to FIGS.

The main configuration is the same as that of the third embodiment. The difference in the operation is that the temperature control by the temperature control means 40 is performed as shown in FIG.
4 is to change the temperature control method according to the output set by the operation unit 21 by adding step 51 shown in FIG.

As shown in FIG. 14, in step 51, it is determined whether or not the output of the inverter 33 set by the operation section 21 is the maximum setting output. In the case of the maximum setting output, the third embodiment shown in FIG. Steps 31 to 36 are performed in the same manner as described above, and in cases other than the maximum setting output, the operations of steps 11 to 15 shown in FIG. 2 are performed. However, unlike the first embodiment, the control temperature according to the set output used for the condition determination in steps 13 and 15 is not a control temperature that becomes higher as the set output is smaller, but is constant regardless of the set output as shown in FIG. Are set to the control temperatures 1 and 2. That is, only when the output set by the operation unit 21 is the maximum setting output, the output of the inverter 33 is increased or decreased according to the temperature of the thermistor 38a, and the temperature is controlled by operating the solid line in FIG. Temperature control is performed at control temperatures 1 and 2.
Therefore, when the output set by the operation unit 21 is the maximum setting output, the same effect as in the third embodiment is obtained. When the output is other than the maximum setting output, the control temperature can be set low and the maximum temperature of the load 36 can be suppressed. And safety can be further ensured.

As described above, according to this embodiment, the operation unit 2
The output of the inverter 33 set at 1 is the maximum set output (2
000 W), the same effect as that of the third embodiment is obtained by performing the same temperature control as that of the third embodiment. When the output of the inverter 33 set by the operation unit 21 is other than the maximum set output, the control temperature of the thermistor 38a is reduced. By setting the temperature lower, the maximum temperature of the load 36 can be suppressed, and safety can be further secured.

In this embodiment, the same temperature control as that of the third embodiment is performed when the output of the inverter 33 set by the operation unit 21 is the maximum set output (2000 W). It goes without saying that the same effect as in each embodiment can be obtained by performing the same temperature control.

[0048]

As described above, according to the first aspect of the present invention,
Lever can be controlled to the appropriate load temperature corresponding to the output set by the operation unit, thereby improving the cooking performance.

According to the second aspect of the present invention, the load temperature can quickly reach the target temperature without overshooting, and the cook does not need to change the set output. The cooking performance of stir-fry can be improved.

According to the third aspect of the present invention , the load on the storage circuit can be reduced and the target temperature can be quickly reached without overshooting the load.

According to the fourth aspect of the present invention, the maximum control temperature can be appropriately suppressed, and the maximum temperature of the load can be suppressed even when the load has a small heat capacity. And safety can be further ensured.

Further, according to the fifth aspect of the present invention,
The control temperature at times other than the time when the maximum output that can be set by the operation unit is set can be controlled further lower, and safety can be further secured.

[Brief description of the drawings]

FIG. 1 is a main configuration diagram of an induction heating cooker according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the induction heating cooker;

FIG. 3 is a diagram showing a relationship between a set output and a temperature.

FIG. 4 is a diagram showing the relationship between time and temperature.

FIG. 5 is a main configuration diagram of an induction heating cooker according to a second embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of the induction heating cooker.

FIG. 7 is a diagram showing the relationship between set output and temperature.

FIG. 8 is a diagram showing the relationship between time and temperature.

FIG. 9 is a main configuration diagram of an induction heating cooker according to a third embodiment of the present invention.

FIG. 10 is a flowchart showing the operation of the induction heating cooker.

FIG. 11 is a diagram showing the relationship between set output and temperature.

FIG. 12 is a flowchart showing the operation of the induction heating cooker according to the fourth embodiment of the present invention.

FIG. 13 is a diagram showing the relationship between set output and temperature.

FIG. 14 is a flowchart showing the operation of the induction heating cooker according to the fifth embodiment of the present invention.

FIG. 15 is a diagram showing the relationship between the set output and the temperature.

FIG. 16 is a main configuration diagram of a conventional induction heating cooker.

FIG. 17 is a flowchart showing the operation of the induction heating cooker;

FIG. 18 is a diagram showing the relationship between time and temperature.

[Explanation of symbols]

 13, 33 inverter 14, 34 control circuit 16, 36 load 18, 38 temperature detection means 19, 39 storage circuit 20, 40 temperature control means 21 operation unit

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yuji Fujii 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Hiroshi Tominaga 1006 Kadoma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Daizo Ogata 1006 Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Akira Kataoka 1006 Odaka, Kazuma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (56) Reference Document JP-A-1-220391 (JP, A) JP-A-62-69484 (JP, A) JP-A-62-20492 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H05B 6/12

Claims (5)

(57) [Claims] An inverter for converting a commercial power supply into a high-frequency current; a control circuit for controlling an output of the inverter;
Temperature detection means for detecting the temperature of the load, an operating unit for setting the output of the inverter, detected by said temperature detecting means
If the temperature exceeds the control temperature 1 stored in the storage circuit
If the output of the inverter is stopped or reduced
In both cases, the temperature detected by the temperature detection means is stored in the storage circuit.
When the control temperature stored in the road becomes 2 or less,
Temperature control means for controlling the inverter output to increase
And a storage circuit, wherein the storage circuit has an output set by the operation unit.
An induction heating cooker storing the control temperature 1 and the control temperature 2 according to the conditions. 2. An inverter for converting a commercial power supply into a high-frequency current, a control circuit for controlling an output of the inverter,
Temperature detection means for detecting a temperature of the load, the temperature sensing hand
The temperature detected by the stage is the control temperature 1 stored in the storage circuit.
If the output exceeds, stop or reduce the output of the inverter.
And the temperature detected by the temperature detecting means
When the control temperature stored in the storage circuit becomes 2 or less,
Control to increase the output of the inverter
Temperature control means, wherein the storage circuit is provided with the inverter
The control temperature 1 and the control temperature 2 corresponding to the output of
An induction heating cooker you can remember . 3. An operation unit for setting an output of the inverter.
3. The induction heating cooker according to claim 2, wherein the storage circuit stores only the control temperature 1 and the control temperature 2 corresponding to the output of the inverter that can be set by the operation unit. 4. The temperature control means, when the output of the inverter is equal to or less than a predetermined value, and when the temperature detected by the temperature detection means exceeds the control temperature 1 stored in the storage circuit.
4. The induction heating cooker according to claim 2, wherein the output of the inverter is controlled to be stopped. 5. An operation unit for setting an output of the inverter.
For example, temperature control unit, when setting the maximum possible output by the operation unit is not set, any claim 2-4 comprising controlled at a predetermined control temperature 1 and the control temperature 2 regardless of the set output 2. The induction heating cooker according to claim 1.