JP3109180B2 - 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 heating cooker used in ordinary households.

[0002]

2. Description of the Related Art The configuration of a conventional general induction heating cooker is shown in a block diagram of FIG. 3, and its operation is shown in timing charts of FIGS. 4 (a) and 4 (b).

In FIG. 3, reference numeral 21 denotes a commercial AC power supply, and an induction heating device 22 includes a high-frequency power supply 23 and a heating coil 2.
4. The pan 25 is a load heated by the induction heating device 22, and the temperature of the pan 25 is measured by the temperature detection unit 26. A power setting means 27 allows the user to arbitrarily select a desired power from six levels of power from 150 W to 1200 W set in advance. Reference numeral 28 denotes a control unit, and a power setting unit 27
The induction heating device 22 is controlled so that the electric power is set by the following.

In such an induction heating cooker, stable electric power control is possible instead of ON / OFF control as in a general electric heater, and it is also possible for the induction heating cooker to disappear by blowing over like gas. It has the advantage of no ventilation and ventilation, so it is often used for low power, long stewed dishes.

[0005] Graphs of the electric power and the load temperature when the stew is cooked are shown in FIGS. 4 (a) and 4 (b). At this time, at the point B shown in FIG.
When the temperature detected by the above exceeds the predetermined temperature θ2, it is determined that the burn has occurred, and the heating is stopped.

[0006]

However, in the configuration of the conventional induction heating cooker described above, since the stable low power is applied during the cooking of the stew, the stewed material settles at the bottom of the pan. There was a problem that the material was easily scorched, and the method of applying heat was uneven due to the material precipitated on the bottom, so that cooking performance was significantly reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its first object to provide an induction heating cooker having good cooking performance so that ingredients during a stewed dish do not stick to the bottom of a pan. And A second object is to prevent the ingredients from burning when the amount of water in the stewed dish decreases.

[0008]

In order to achieve the above object, a first object of the present invention is to provide an induction heating device having a high frequency power supply and a heating coil, and a load pot heated by the induction heating device. Temperature detection means for measuring the temperature of the
Power setting means for arbitrarily setting the heating output of the induction heating device, control means for receiving the output of the power setting means to control the heating output of the induction heating device, and receiving and setting the output of the power setting means A stirring means for outputting to the control means such that the heating output is increased to the predetermined output W2 larger than the predetermined output W1 only during the predetermined time T2 at every predetermined time T1 when the heating output is equal to or less than the predetermined output W1. preparative <br/> Bei example, an increase in heating power by the stirring means, temperature sensing
Prohibit if the temperature detected by the means is higher than the predetermined temperature
It is like that.

[0009]

DETAILED DESCRIPTION OF THE INVENTION The present invention by hand stage described above, by providing the stirring means, when performing a long stews at a power lower than a predetermined power W1 set by the power setting unit, every predetermined time T1 A predetermined power W for a predetermined time T2
By applying a predetermined power W2 greater than 1, the water in the pot is boiled for a short time to induce convection in the pot, and the convection can stir the stewed ingredients.

[0010] Also, when the temperature of the pot measured by the temperature sensing means in increasing the heating power by the upper Symbol stirring means is higher than a predetermined temperature, moisture by prohibiting an increase in power by the stirring means Evaporation can be reduced.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an induction cooking device, and FIG.
(A) and (b) are timing charts showing the operation. In FIG. 1, reference numeral 1 denotes a commercial AC power supply, and the induction heating device 2 includes a high-frequency power supply 3 and a heating coil 4. The pan 5 is a load heated by the induction heating device 2, and the temperature of the pan 5 is measured by the temperature detecting means 6.
Reference numeral 7 denotes a power setting means which allows the user to arbitrarily select a desired power from six levels of power preset from, for example, 150 W to 1200 W. The control means 8 controls the high-frequency power supply 3 of the induction heating device 2 so that the power set by the power setting means 7 is obtained. Further, the control means 8 includes a stirring means 9 for controlling the power of the high frequency power supply 3 based on a predetermined timing during heating and a signal from the temperature detection means 6.

In the above configuration, when the electric power set by the electric power setting means 7 is lower than the predetermined electric power W1, for example, 300 W, the agitating means 9 sets the predetermined time T2 for every predetermined period T1, for example, every 10 minutes. The control means 8 is operated so that the maximum power of 1200 W is supplied to the load pot 5 only during the period, for example, for only 30 seconds.
As a result, the water in the pan 5 is boiled for a short time so that the pan 5
A convection in the water can be induced, and the convection can agitate the stewed material.

When the temperature of the pan 5 detected by the temperature detecting means 6 while 1200 W is supplied to the pan 5 for a predetermined time T2 by the stirring means 9 exceeds a predetermined temperature θ1, for example, 100 ° C. In this case, it is determined that the water content of the stewed ingredients in the pot 5 has decreased, and the supply of 1200 W of power is stopped.

FIG. 2 (a) shows the change with time of the electric power supplied to the pot 5 by the induction heating device 2 in FIG. 2 (b).
Shows the temperature change of the pot 5 as a result. That is, the agitation means 9 sets the predetermined time T2 at every predetermined time T1.
Only during this period, the electric energy is increased from 300 W to 1200 W. Then, at time point A in FIG. 2B, when the temperature exceeds a predetermined temperature θ1, the power is returned from 1200 W to 300 W. And further, A '
If the temperature exceeds 120 ° C. at that point, it is determined that the material in the pan 5 has been burnt, and the heating is stopped.

[0015]

As described above, the first effect of the present invention is that the provision of the agitating means makes it possible to reduce the amount of electric power less than the predetermined electric power W1 by a predetermined time every predetermined time T1 when the stewed dish is being cooked. Since the electric power of the electric power amount W2 larger than W1 is supplied to the load pot only during T2, the water in the pan is temporarily boiled, and the ingredients for the stew cooking settled at the bottom of the pan are stirred. It is possible to obtain an induction heating cooker with good cooking performance in which the materials are evenly heated.

The second effect is that when the temperature of the pot detected by the temperature detecting means exceeds a predetermined temperature θ1 while the stewed material in the pot is being stirred by the stirring means with large electric power, Since it is determined that the water content of the cooking ingredients in the pot is decreasing, the supply of large electric power is stopped, so that the cooking ingredients can be stewed safely without scorching.

[Brief description of the drawings]

FIG. 1 is a block diagram of an induction heating cooker according to one embodiment of the present invention.

FIGS. 2A and 2B are timing charts showing the operation of the induction heating cooker;

FIG. 3 is a block diagram of a conventional heating cooker.

FIGS. 4A and 4B are timing charts showing the operation of the cooking device;

[Explanation of symbols]

 2 Induction heating device 3 High frequency power supply 4 Heating coil 5 Pan 6 Temperature detection means 7 Power setting means 8 Control means 9 Stirring means

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yumiko Kiyama 1006 Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-1-292788 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H05B 6/12

Claims (1)

(57) [Claims] An induction heating device having a high-frequency power supply and a heating coil, temperature detecting means for measuring a temperature of a pot of a load heated by the induction heating device, and a heating output of the induction heating device are arbitrarily set. Power setting means, control means for receiving the output of the power setting means to control the heating output of the induction heating device, and when the heating output set by receiving the output of the power setting means is equal to or less than a predetermined output W1, Predetermined time T
A stirring means for outputting to the control means such that the heating output is increased to a predetermined output W2 larger than the predetermined output W1 only for a predetermined time T2 for each of the temperature detecting means;
If the detected temperature of the pot exceeds a predetermined temperature,
An induction heating cooker in which an increase in output due to stirring means is prohibited .