JP2010182600A - Induction heating cooker - Google Patents

Abstract

An object of the present invention is to safely control the heating power to prevent burning and scorching even if the food in the pan decreases during reheating and the temperature of the pan rises.
A heating key 15 that shifts to a heating mode that is operated by a user to heat at a predetermined set power, a heat key 21 that changes the set heat, and a heating output setting that is changed high for a predetermined time and a predetermined time elapses. The reheating key 17 that returns to the original setting heat power before the change, the temperature sensor (pan temperature detecting means) 7 that detects the temperature of the pan 1 through the top plate 2, and the temperature of the temperature sensor 7 reach a predetermined threshold value. In this case, a thermal power control means 10 that determines that the temperature is overheated and limits the thermal power, and a controller 6 that controls the output of the heating coil 3 by controlling on / off of the switching element 4 are provided. Changing the threshold at which the means 10 operates to be lower than in the heating mode.
[Selection] Figure 1

Description

  The present invention relates to an induction heating cooker used for cooking a pot on a table or cooking a pottery.

Conventionally, in an induction heating cooker, a pan for putting food, a heating means for heating the pan, a thermal key for changing the heating power set in the heating mode, a reheating key operated by the user, a type and cooking of the pan It consists of a dedicated key that controls each menu in a predetermined sequence and a controller that controls the heating means. When the user operates the reheating key, the heating power is changed to a high level for a predetermined time, and the predetermined time has elapsed. The heating means is controlled to return to the set heating power before operating the reheating key later. By operating the reheating key in this way, for example, when a pot is made on a household table by automatic cooking, the user can instruct an increase in heating power at the timing of adding ingredients, soup stock, etc. ( For example, see Patent Document 1).
JP 2008-140676 A

  However, in the conventional configuration, when the mode is changed to the reheating mode, the control is performed so that the reheating mode is ended and the original heating power is returned when a predetermined time has elapsed. When the cooking contents of the pan such as the broth decreased during the reheating, the temperature of the pan rises, so that there is a problem that empty baking or scorching occurs.

  The present invention solves the above-mentioned conventional problems, and even if the food in the pan is reduced during reheating and the temperature of the pan rises, the heating power is safely controlled to prevent burning and scorching. An object of the present invention is to provide an induction heating cooker.

  In order to solve the above-described conventional problems, an induction heating cooker according to the present invention includes a heating means including a heating coil and a switching element for heating a pan placed on a top plate, and a predetermined setting thermal power operated by a user. Heating key to heat in, heating key to change the heating mode setting heating power, reheating mode to change the setting heating power high for a predetermined time when operated in the heating mode and return to the original setting heating power before the change after the predetermined time A reheating key to be transferred to, a control unit for controlling the heating unit, a pan temperature detecting unit for detecting the temperature of the pan, and a switching element temperature detecting unit for detecting the temperature of the switching element, the control unit, During the reheating, the first temperature threshold value at which the thermal power control means operates is changed to a low value.

  As a result, even if the food in the pan decreases during reheating and the temperature of the pan rises, it is possible to safely control the heating power and prevent burning or scorching before the temperature rises. it can.

  The induction heating cooker of the present invention can prevent the occurrence of baking or burning and the overheating of the device itself even when the temperature of the pan becomes high during reheating, and safety is improved. .

A first invention is a heating coil that heats a pan placed on a top plate, a heating means that includes a switching element for supplying a high-frequency current to the heating coil, and is heated by a user to operate with a predetermined heating power. A heating key, a heating key that changes the set heating power during heating, a reheating key that changes the setting heating power high for a predetermined time when operated during heating, and returns to the original setting heating power before the change after a predetermined time, and Pan temperature detecting means for detecting the temperature of the pan over the top plate, thermal power control means for limiting the thermal power according to the temperature of the pot temperature detecting means, and the detected temperature of the pot temperature detecting means rises and the temperature rises. And a control unit that controls the output of the heating coil by controlling on / off of the switching element. By reheating key operation, when the heating power rises, the first temperature threshold is changed to be lower than that in the heating mode, so that the cooking of the pot starts to decrease during the reheating, and even if the temperature of the pot becomes high, By making the threshold value for determining the temperature overheating lower than that in the heating mode, it is possible to determine the temperature overheating earlier even if reheating is performed with a high heating power, thereby improving safety.

  In the second aspect of the invention, in particular, the control unit of the first aspect of the invention cooks again after the end of the reheating, by increasing the first temperature threshold again when the reheating mode ends and the heating power returns. The cooking performance is improved because the heating power is not limited when the temperature of the pan is low.

  In the third invention, in particular, the control unit of the first or second invention is set to a predetermined heating power or less at the end of the reheating mode, so that it returns to a high heating power immediately after the end of the reheating, and the pan again. Since the temperature of the hot plate becomes high, it is possible to prevent the occurrence of burning and scorching, and the safety of the user is improved.

  In the fourth aspect of the invention, in particular, the control unit of any one of the first to third aspects of the invention is set to an operation mode in which a different threshold value is set lower than the first temperature threshold value before reheating transition during reheating. By switching, it can be determined that the temperature has overheated even if it is reheated with high heating power, so that the safety is improved in the same manner as in the above invention.

  According to a fifth aspect of the present invention, in the reheating mode, in particular, in the control unit according to any one of the first to fourth aspects, the switching element temperature detecting means for detecting the temperature of the switching element prevents the switching element from excessively rising. Lowers the second temperature threshold value at which the thermal power control means operates than in the heating mode, thereby preventing the switching element from being destroyed and further improving the safety of the user.

  In the sixth aspect of the invention, in particular, in the control unit of any one of the first to fifth aspects, the heating coil protection means for operating the heating power control means to protect the heating coil according to the temperature detected by the pan temperature detection means is provided. By making the operating heating coil protection temperature threshold lower than that in the heating mode, the temperature of the heating coil rises due to the hot pot, and damage to the heating coil can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows the configuration of an induction heating cooker according to the first embodiment of the present invention.

As shown in FIG. 1, the induction heating cooker in the present embodiment includes a pan 1 into which a food is put, a top plate 2 made of heat-resistant glass or the like on which the pan 1 is placed, and the pan 1 over the top plate 2. The heating means 5 composed of the heating coil 3 and the switching element 4 for heating the heat, the control unit 6 composed of a microcomputer for controlling the heating means 5, and the bottom surface of the pan 1 are measured through the top plate 2. A pan temperature detecting means 8 comprising a temperature sensor 7 such as a thermistor and an infrared sensor, a switching element temperature detecting means 9 for detecting the temperature of the switching element 4 by the temperature sensor 7, and a heating power when temperature rises. The thermal power control means 10, the first temperature threshold 11 for operating the thermal power control means 10 according to the temperature of the pan 1, and the thermal power control according to the temperature of the switching element 4. A second temperature threshold 12 for operating the means 10; a heating coil protection means 13 for controlling the heating power to protect the heating coil 3; a heating coil protection temperature threshold 14 for operating the heating coil protection means 13; Reference numeral 25 denotes a heating key 15, a turn key 16, a reheating key 17, a cancel key 20, and a heating key 21 which start a heating mode operated by a user and heated at a predetermined setting heating power. And a down key 19 for lowering the set thermal power. Then, when the reheating key 17 is operated in the heating mode, the control unit 6 changes the set heating power to a high level for a predetermined time and shifts to the reheating mode in which the setting heating power before the change is returned after the predetermined time has elapsed.

  About the induction heating cooking appliance comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. Note that the present invention is not limited to the embodiments.

  In general, when cooking while cooking a pot on the table, after the first ingredients have been eaten to some extent, the next ingredient is put into the pot 1 for re-cooking, or when the temperature is lowered by baking, the user Operates the reheating key 17. Then, as shown in FIG. 2A, the reheating key 17 is operated when the heating is performed with the set heating power 5 to shift to the reheating mode. When shifting to the reheating mode as shown in FIG. 2 (b), the first temperature threshold 11 is lowered from T2 to T1 in the heating mode. Since the temperature of the pan 1 reaches T1 which is the first temperature threshold value 11 earlier than the heating mode, the heating power is controlled earlier than the predetermined time in the reheating mode by the heating power control means 10, and the setting heating power 7 to the setting heating power 6 Is lowered. The set thermal power after the end of the reheat mode after the elapse of the predetermined time in the reheat mode is the set thermal power immediately before the end of the reheat mode, and thus returns to the set thermal power 5. By doing so, it is possible to safely control the heating power before the temperature is overheated and to prevent burning and scorching.

  Further, when the reheating mode is finished, the first temperature threshold 11 is again raised to the original value T3. By doing so, in the case of heating again after reheating, if the first temperature threshold 11 remains lowered, the heating power is limited by the heating power control means 10 at an early stage. Resulting in. However, by returning to the original threshold value, the firepower is not limited at an early stage, so the usability is improved.

  Further, T2 'of the second temperature threshold 12 in the solid line heating mode shown in FIG. 2C is also lowered to the temperature threshold T1' shown in the solid line during the reheating mode. Even when the temperature of the pot 1 rises due to a decrease in the cooked food in the pot 1 or the temperature of the switching element temperature detecting means 9 rises due to a warp of the pot 1, the thermal power control means 10 operates faster than in the heating mode. To come. Then, the thermal power control means 10 lowers the thermal power setting 7 to the thermal power settings 5 and 6. Similarly, safety is improved.

  Further, T2 ″ of the heating coil protection temperature threshold value 14 in the solid line heating mode shown in FIG. 2D is also lowered to the temperature threshold value T1 ″ indicated by the dotted line during the reheating mode. Since the heating coil protection means 13 for controlling the heating power to protect the heating coil 3 operates quickly, the temperature of the heating coil 3 rises due to heat conduction due to the temperature rise of the pan 1 or an increase in the loss of the heating coil 3. Even more, the safety of the induction heating cooker is improved.

  Note that the first temperature threshold 11 and the second temperature threshold 12 do not necessarily have the same set value. Safety is improved by setting each to an appropriate setting value.

(Embodiment 2)
As shown in FIG. 3, the induction heating cooker according to the present embodiment has the configuration according to the first embodiment (see FIG. 1), and the operation section 25 has a course selection key 22 that can select a cooking course for automatic cooking. And the first temperature threshold value 11 can be changed depending on the cooking course. The first temperature threshold 11 is set to a different threshold for each cooking course such as a heating mode or automatic cooking. Assume that the first temperature threshold 11 is higher in the course 1 (23) than in the course 2 (24) as shown in FIG. When the reheat key 17 is operated during cooking in the course 1 (23), the first temperature threshold 11 is switched to the threshold of the course 2 (24), and the thermal power control is performed by the first temperature threshold 11 of the course 2 (24). The means 10 comes to operate. As in the above-described invention, the safety heating power can be controlled before the temperature is overheated to prevent burning or burning.

(Embodiment 3)
The induction heating cooker in the present embodiment has the same configuration as in the first embodiment. As shown in FIG. 5, during heating in the heating mode with the set heating power 5, the reheating key is operated to increase the heating power, and after the predetermined time in the reheating mode has elapsed and the reheating is over, the lower heating power of the setting heating power 3 is reached. To. By setting to low heating power, it is possible to prevent the temperature of the pan from becoming high again by returning to high heating power immediately after reheating.

  As described above, the induction heating cooker according to the present invention is not limited to reheating, and in the case of heating with high thermal power, the temperature threshold value at which the thermal power control and protection functions operate is lower than that in the normal heating mode. Since it becomes possible to detect an excessive rise early, it can be applied to a cooking device for home use or business use.

The whole block diagram of the induction heating cooking appliance in Embodiment 1 of this invention Temperature threshold transition diagram of induction heating cooker in Embodiment 1 of the present invention Control part block diagram of the induction heating cooking appliance in Embodiment 2 of this invention Thermal power control diagram of induction heating cooker in Embodiment 2 of the present invention Set thermal power transition diagram of induction heating cooker in Embodiment 3 of the present invention

1 Pan 2 Top plate 3 Heating coil 5 Heating means 7 Temperature sensor 21 Thermal key

Claims (6)

A heating coil for heating the pan placed on the top plate, heating means including a switching element for supplying a high-frequency current to the heating coil, and heating for starting a heating mode operated by a user and heated with a predetermined heating power A key, a heating key for changing the set heating power during heating, a reheating key for changing the setting heating power high for a predetermined time when operated during heating, and returning to the original setting heating power before the change after a predetermined time, and the top Pan temperature detecting means for detecting the temperature of the pan over the plate, thermal power control means for limiting the thermal power according to the temperature of the pan temperature detecting means, and the detected temperature of the pan temperature detecting means rises and the temperature rises. A first temperature threshold for determining and operating the thermal power control means; and a controller for controlling the output of the heating coil by controlling on / off of the switching element, the controller The by reheating key operation, the induction heating cooker which is to be changed lower than the heating mode the first temperature threshold value at the time of rise firepower. The induction heating cooker according to claim 1, wherein the controller raises the first temperature threshold again when the reheating mode ends and the heating power returns. The induction heating cooker according to claim 1 or 2, wherein the control unit is set to a predetermined heating power or less at the end of the reheating mode. The control unit according to any one of claims 1 to 3, wherein the control unit switches to an operation mode set to a different threshold value lower than the first temperature threshold value before the reheating transition during the reheating. Induction heating cooker. The control unit includes a switching element temperature detecting means for detecting the temperature of the switching element, and a second temperature threshold value for operating the heating power control means so that the switching element temperature detecting means does not cause the temperature of the switching element to rise excessively. The induction heating cooker according to any one of claims 1 to 4, wherein the controller is configured to lower the second temperature threshold during the reheating mode than during the heating mode. The control unit includes a heating coil protection unit that operates the heating power control unit to protect the heating coil in accordance with the temperature detected by the pan temperature detection unit. The control unit operates the heating coil protection unit in the reheating mode. The induction heating cooker according to any one of claims 1 to 5, wherein a heating coil protection temperature threshold value is set lower than that in the heating mode.

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