JP2855921B2 - 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. 4, and its operation is shown in timing charts of FIGS. 5 (a) and 5 (b).

In FIG. 4, reference numeral 11 denotes a commercial AC power supply, and an induction heating device 12 comprises a high-frequency power supply 12a and a heating coil 12b. Pot 13 is induction heating device 1
2 is a load which is disposed at a predetermined distance from the upper surface of the heating coil 12b and is heated by the heating coil 12b.
Reference numeral 4 determines whether the pot 13 is suitable for heating by the induction heating device 12. This accessory detection means 14
For example, it is determined that an iron or enamel pot can be heated by the induction heating device 12, but an aluminum or pottery pan cannot be heated. Heating is dangerous and distinguishes them from ordinary pots. Of course, the small object detection means 14 can also determine when the pot 13 is not present when the heating is started or when the pot 13 is removed during the heating and cooking.

The control means 15 acts on the induction heating device 12 to control the output power. The small object load prohibiting means 16 is a pan 13 which cannot be heated by the small object detecting means 14.
If it is determined that the output of the induction heating device 12 has been determined, the output of the induction heating device 12 is stopped after a predetermined time T0. Further, the heating start means 17 is constituted by a key switch, and upon receiving this input, the control means 15 starts heating by the induction heating device 12.

FIGS. 5A and 5B are timing charts of a conventional small object detection operation. In FIG. 5A,
The heating coil 12b of the induction heating device 12 is placed on a load such as an unheated pottery, or the time 0
At this point, when the heating is started in response to the input of the heating start means 17, the control means 15 gradually applies electric power until a predetermined electric power is obtained. As a result, at point f, the small object detecting means 14
Thus, it is determined that the pot 13 cannot be heated by the induction heating device 12, and the accessory
5, the output of the induction heating device 12 is once stopped. After that, the state of the load is confirmed by periodically applying power to the point g, and then the output is stopped at the point g after T0 time. If a load that can be heated by the induction heating device 12 is placed on the upper surface of the heating coil 12b within the time T0, normal heating is performed from there.

FIG. 5 (b) shows a case in which the pot 13 which can be heated by the induction heating device 12 is removed during cooking, and the output is stopped after a time T0 as in the case of FIG. 5 (a). ing.

[0007]

However, in the above-described configuration of the conventional induction heating cooker, the time from the detection of a small object to the stop of the output is the same at the initial heating start and during the heating cooking. At the start of heating, the user tried to cook using a load that could not be heated from the beginning, or tried to cook without the pan 13, and detected a small object. If the time T0 is set to 0 on the other hand, the pan 1
If the user replaces the pan 3, or once removes the pot 13 to perform the cooking operation and then attempts to heat again, the heating stops and the heating start means 17 must be operated to cook again. Had.

[0008] The present invention solves the above-mentioned problem. When heating is to be started in an unusable pot, the heating can be stopped in a short time to inform a user of a mistake, and the present invention is more convenient. First to provide induction heating cookers
The purpose of.

[0009] A second object of the present invention is that during cooking operations,
An object of the present invention is to provide a more convenient induction heating cooker that can continue cooking without stopping heating even if a pot is removed for another cooking operation.

[0010]

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 whether the induction heating device is suitable for heating by the induction heating device. A small object detecting means for determining whether or not the heating output of the induction heating device is controlled; a heating start means for starting heating of the load by the induction heating device; and a load by the induction heating device by the heating start means. When it is determined that the load cannot be heated by the accessory detection means when the heating of the heating is started, the heating is stopped after a predetermined time T1 by the control means, and the heating is being performed by the induction heating device. If the small object detection means determines that heating is not possible, the control means stops heating after a predetermined time T2 longer than the predetermined time T1. It is constructed by comprising a.

The second object of the present invention is to provide a temperature detecting means for measuring a temperature of the load, and a small load prohibiting means when the temperature of the load detected by the temperature detecting means exceeds a predetermined temperature. A predetermined delay time T1 'longer than T1 until the stop of heating when the small object detecting means operates at the start of heating by the above and a predetermined delay time T2' longer than T2 until the stop of heating when the small object detecting means operates during heating. And a delay means for extending the extension.

[0012]

According to the first aspect of the present invention, by providing the small object load inhibiting means by the first means, it is determined by the small object detecting means that the load cannot be heated by the induction heating apparatus when heating is started by the induction heating apparatus. In this case, the heating is stopped after a predetermined time T1, and when it is determined that the load cannot be heated by the induction heating device by the accessory detection means during the heating, the predetermined time T2 longer than the time T1. The heating can be stopped later.

In the second means, when the temperature of a load such as a pot heated by the induction heating device is higher than a predetermined temperature, the first means is provided with a temperature detecting means and a stop delay means. In this case, the time from when it is determined that heating cannot be performed by the accessory detection means to when the heating is stopped can be extended to a time longer than T1 and T2 by acting on the accessory load inhibition means.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the first embodiment and the second embodiment of the induction heating cooker together.
FIGS. 3A and 3B are timing charts showing the operation of the first embodiment, and FIGS. 3A and 3B are timing charts showing the operation of the second embodiment.

In FIG. 1, reference numeral 1 denotes a commercial AC power supply,
The induction heating device 2 includes a high-frequency power supply 2a and a heating coil 2b. The pan 3 is a load that is heated by the induction heating device 2 and is disposed at a predetermined distance on the upper surface of the heating coil 2b. The accessory detection means 4 determines whether the pan 3 is suitable for heating by the induction heating device 2. To judge. The small object detecting means 4 determines that, for example, an iron or enamel pot can be heated by the induction heating device 2, but an aluminum or pottery pot cannot be heated. Spoons, forks, etc. are distinguished from ordinary pots so that they are not heated because they are dangerous when heated. Of course, the determination can be made by the accessory detecting means 4 when the pot 3 is not present when the heating is started, or when the pot 3 is removed during the heating and cooking.

The control means 5 controls the output electric power by acting on the induction heating device 2. The heating start means 6 is constituted by a key switch. Upon receiving this input, the control means 5 starts heating by the induction heating device 2.

If the small object detecting means 4 determines that the pot 3 cannot be heated when the heating is started by the input of the heating starting means 6, the small object load prohibiting means 7 performs the predetermined time T 1.
The control means 5 stops the output of the induction heating device 2 later.
Is to be output. If the small object detecting means 4 is activated by removing the pan 3 while the induction heating device 2 is heating the pot 3, the time until the heating of the small object load inhibiting means 7 is stopped by a predetermined time. The predetermined time T2 is longer than T1.

The above are the components of the first embodiment of the present invention. The components of the second embodiment of the present invention are provided with the temperature detecting means 8 and the stop delay means 9 shown in the first embodiment. That is, the temperature detecting means 8 measures the temperature of the pot 3 heated by the induction heating device 2. The stop delay unit 9 detects the temperature θ of the pan 3 detected by the temperature detection unit 8.
Is higher than the predetermined temperature θ1, the time from the detection of the small object by the small object load prohibiting means 7 to the stop of the output is extended.

The operation of the first embodiment having the above configuration is shown in FIG.
This will be described with reference to timing charts (a) and (b). FIG. 2A shows a case in which when the heating is started by the heating starting means 6, the small object detecting means 4 determines at point a that the pot 3 of the load cannot be heated by the induction heating device 2. At this time, the time T1 until the output is stopped by the accessory load prohibiting means 7 is set to 0 hour in this case, and the output of the induction heating device 2 is stopped at the same time when the accessory detecting means 4 operates.

FIG. 2 (b) shows that the induction heating device 2 uses the pot 3.
In the case where the small object detecting means 4 is activated because the pot 3 is removed at the point c during the heating of
The heating output is stopped at point d after the predetermined time T2.
This time T2 is, for example, a time for starting the cooking again after removing the pot 3 from the induction heating cooker and performing some cooking work, or for starting the cooking of another pot.
The replacement time of about 1 minute is appropriate.

Next, the operation of the second embodiment will be described with reference to FIG.
This will be described with reference to the timing chart of FIG. FIG.
(A) shows a case in which when the heating is started by the heating starting means 6, the small object detecting means 4 determines at the point a that the pot 3 of the load cannot be heated by the induction heating device 2. At this time, the temperature θ of the pan 3 detected by the temperature detecting means 8
Is higher than the predetermined temperature θ1, and the time until the output is stopped by the stop load delaying means 9 by the stop delay means 9 is T1 ′.
Set to time.

FIG. 3 (b) shows that the induction heating device 2 uses the pot 3.
At point c 'in the middle of the heating, the small object detecting means 4 is activated by removing the pot 3, etc., and the heating output is stopped at point e after a predetermined time T2'. At this time, the pan 3 detected by the temperature detecting means 8
Since the temperature θ is higher than the predetermined temperature θ1, the time until the output is stopped by the small load prohibiting means 7 by the stop delay means 9 is set to time T2 '. This time T2 'is, for example, about 5 minutes, which is a time for removing the pot 3 sufficiently heated during cooking from the induction heating cooker, performing another cooking operation on the way, and then starting heating again. And

[0024]

As described above, according to the induction heating cooker of the present invention, the first effect is that the provision of the accessory load inhibiting means allows the time from the detection of the accessory at the start of heating to the stop of the heating. Rather than taking a longer time until the user stops heating when a small object is detected while heating for cooking, the user can temporarily return from the induction heating cooker during heating cooking. Even if the pot is removed and then put on the induction heating cooker again, heating is started immediately, and the user can continue cooking without having to start heating again.

On the other hand, when a small object is detected when heating is to be started, the user has used a pot that cannot be used with the induction heating cooker, or has attempted to heat without placing the pot. Therefore, the user can be notified of the error by immediately stopping the heating.

The second effect is that the provision of the temperature detecting means and the stop delay means stops heating when the temperature of the pot is high, that is, when a small object is detected while the user is cooking. By extending the time until, the user can perform various cooking operations with the pan removed from the induction heating cooker, and then resume cooking simply by placing the pan on the cooker again.

[Brief description of the drawings]

FIG. 1 is a block diagram of an induction cooking device showing both a first embodiment and a second embodiment of the present invention.

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

FIGS. 3A and 3B are timing charts showing the operation of the induction heating cooker according to the second embodiment;

FIG. 4 is a block diagram of a conventional induction heating cooker.

FIGS. 5A and 5B are timing charts showing the operation of the induction heating cooker;

[Explanation of symbols]

 Reference Signs List 2 induction heating device 2a high-frequency power supply 2b heating coil 3 pot (load) 4 accessory detection means 5 control means 6 heating start means 7 accessory load prohibition means 8 temperature detection means 9 stop delay means

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-1055891 (JP, A) JP-A-61-208774 (JP, A) JP-A-4-215286 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) H05B 6/12

Claims (2)

(57) [Claims] An induction heating device having a high-frequency power supply and a heating coil, small object detection means for judging whether or not the induction heating device is suitable for heating, and control means for controlling a heating output of the induction heating device. Heating start means for starting heating of the load by the induction heating device, and when the heating start means starts heating the load by the induction heating device, when it is determined that the load cannot be heated by the small object detection means. Stops heating after the predetermined time T1 by the control means, and when it is determined that heating cannot be performed by the accessory detection means during heating by the induction heating device, the control means starts the predetermined time T1. An induction heating cooker comprising a small load prohibiting means for stopping heating after a long predetermined time T2. A temperature detecting means for measuring a temperature of the load; and, when the temperature of the load detected by the temperature detecting means exceeds a predetermined temperature, the small article detecting means is activated when the small article load inhibiting means starts heating. A predetermined delay time T1 'longer than T1 until the heating is stopped and a predetermined delay time T2' longer than T2 until the heating is stopped when the small object detection means operates during heating.
2. The induction heating cooker according to claim 1, further comprising a stop delay means extending to the above.