KR20190077906A - Apparatus for protecting working coils and keeping cooked food warm in induction range - Google Patents

Abstract

The present invention relates to a device for protecting a working coil and keeping cooked food warm in an induction range. If the temperature around a working coil is determined to be higher than the overheating temperature (for example, 55°C) while the cooking is finished, a cooling fan is operated to lower the temperature around the working coil below the overheating temperature to prevent overheating of the working coil. If it is determined that there is a cooking container on a cooking zone formed on a top plate of an induction range during operation of the cooling fan, the cooked food is kept warm by operating the cooling fan in an intermittent operation mode in which the cooling fan is operated and stopped at intervals of a predetermined intermittent operation time (for example, 5 minutes) until the temperature becomes below the overheating temperature. According to the present invention, overheating of the working coil after the cooking is finished is prevented, thereby solving the problem that an enamel coating layer protecting the working coil is peeled off and insulation performance deteriorates or becomes poor, and preventing the risk of burn accidents of a user unaware of overheating. In particular, when there is the cooking container on the cooking zone, the cooked food can be kept warm by gradually operating the cooling fan in the intermittent operation mode until the temperature is lower than the overheating temperature.

Description

[0001] DESCRIPTION [0002] Apparatus for protecting working coils and keeping warmed in induction range for induction ranges [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction range, and more particularly, to a working coil protection for an induction range and a cooking warmer.

The induction range is a working coil of IH (Induction Heater) such as 1, 2, or 3 installed on the lower part of the upper plate and placed on a cooking zone formed in a circular shape on the upper plate A cooking device for heating a cooking vessel.

When the high frequency alternating current of about 20 to 90 kHz is supplied to the working coil of the induction heating coil IH, a magnetic field is generated around the working coil, and during the generation of the magnetic field, When a container (for example, a metallic material cooking vessel having magnetism) is placed on a circular cooking zone formed with a predetermined radius from the center of the working coil, an eddy current is generated inside the cooking vessel and the eddy current is generated The cooking vessel serves as an electric resistance and operates to heat the food inside the cooking vessel by heating operation.

The induction range operating as described above may be such that the temperature of the working coil and the inverter increases due to the inverter repeating the on / off switching operation to supply the high frequency alternating current to the working coil while heating the cooking vessel with the working coil Therefore, the cooling fan operates together during operation of the working coil to prevent the working coil and the inverter from overheating.

Patent Document 1 discloses a technique for preventing overheating of a working coil and an inverter installed under a top plate of an induction range by driving a cooling fan on the basis of data of a heat sensor sensed by a heat sensor disposed under a top plate of an induction range have.

In Patent Document 2, the cooling fan is driven according to the temperature sensed by the temperature sensor provided at the lower portion of the induction range to discharge heat from the lower portion of the induction range and to prevent the working coil and the inverter from overheating Has been published.

In the conventional induction range disclosed in Patent Documents 1 to 2, since the cooling fan is operated while the working coil is heated, when the cooking is terminated and both the working coil and the cooling fan are stopped, the working coil and its surrounding temperature There is a risk of burn accident of the user who is not aware of the overheating, and the enamel coating layer for protecting the working coil is peeled off, resulting in deteriorated insulation performance or poor performance.

KR 10-1288551 B1 KR 10-1772189 B1

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a cooling fan which, when the temperature around the working coil is determined to be over the heating temperature The temperature of the vicinity of the working coil is lowered to less than the overheating temperature to prevent the working coil from overheating and if it is determined that the cooking vessel is provided on the cooking zone formed on the upper plate of the induction range during operation of the cooling fan, The present invention also provides a cooking coil protecting apparatus and a cooking water inserting device for an induction range in which a cooling fan is operated in an intermittent operation mode in which a cooling fan is operated and stopped at intervals of time (for example, 5 minutes).

According to another aspect of the present invention, there is provided a method for inspecting a working coil for a induction range, comprising the steps of: A temperature sensor for sensing a working coil ambient temperature while the working coil of the cooking appliance IH heats the cooking vessel; A cooling fan installed below the upper plate of the induction range for cooling the lower space of the upper plate to prevent the working coil of the induction heater IH from being overheated; And when the temperature around the working coil is judged to be over the overheat temperature (for example, 55 ° C) in the state where the cooking is completed, the cooling fan is operated to lower the temperature around the working coil to less than the overheat temperature, If it is determined that there is a cooking container on the cooking zone during operation of the fan, the cooling fan is gradually operated in an intermittent operation mode in which the cooling fan is operated and stopped at intervals of predetermined intermittent operation time (for example, five minutes) And a control unit for heating the food.

In the working coil protecting and cooking water maintaining apparatus for the induction range according to the present invention, the control unit controls the temperature of the working coil around the working coil so that the temperature around the working coil is higher than the overheat temperature (for example, 55 ° C) 5 DEG C), the cooling fan is continuously operated until the temperature becomes less than the overheating temperature, thereby preventing the working coil from overheating.

In the working coil protecting and cooking water maintaining apparatus for the induction range according to the present invention, the control unit controls the temperature of the working coil around the working coil so that the temperature around the working coil is higher than the overheat temperature (for example, 55 ° C) 5 < 0 > C), it is determined whether or not there is a cooking container on the cooking zone.

In the working coil protecting and cooking water inspecting apparatus for an induction range according to the present invention, when it is determined that there is no cooking container on the cooking zone, the control unit continuously keeps the cooling fan until it becomes less than the overheating temperature (for example, Thereby preventing overheating of the working coil.

In the working coil protecting and cooking water maintaining device for an induction range according to the present invention, when the control unit determines that the cooking container is present on the cooking zone, the control unit controls the intermittent operation mode (for example, The cooling fan is gradually operated to keep the food warm.

In the working coil protecting and cooking water maintaining apparatus for the induction range according to the present invention, when the temperature around the working coil is less than the overheat temperature (for example, 55 ° C), the control unit stops the operation of the cooling fan, And stops the operation of the residual heat display unit for displaying the state as temperature.

The working coil protecting and cooking water maintaining device for an induction range according to the present invention may further comprise a residual heat indicator for indicating a residual heat state of the lower space of the upper plate during operation of the cooling fan.

According to the present invention, it is possible to prevent the overheat of the working coil after the cooking is finished, thereby eliminating the problem that the enamel coating layer for protecting the working coil is peeled off and the insulation performance is deteriorated or becomes poor, , Particularly when there is a cooking vessel in the cooking zone, the food can be kept warm by gradually operating the cooling fan in the intermittent operation mode until the temperature becomes less than the overheating temperature.

1 is a view showing an induction range according to the present invention.
FIG. 2 is a block diagram showing a construction of a working coil protecting apparatus for a induction range according to the present invention and a cooking water inserting apparatus. FIG.
3 is an explanatory view illustrating operation of a working coil protecting apparatus for a induction range and a food keeping apparatus according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, a working coil protecting and cooking warmer 100 for an induction range according to the present invention includes a temperature sensor 110, a cooling fan 120, a control unit 130, and a residual heat display unit 140 ).

The induction range 200 shown in FIG. 1 is provided with one induction heater IH and includes a temperature sensor 110 and a cooling fan 120 installed at a lower portion of the upper plate, And the heating coil 220 of the induction heater IH disposed below the cooking zone 210 formed on the upper plate heats the cooking vessel 300 placed on the cooking zone 210 do.

The present invention is also applicable to an induction range in which a plurality of induction heaters (IH) are installed, such as two or three, unlike the embodiment shown in FIG.

The temperature sensor 110 is installed under the upper plate of the induction range 200 and the cooking coil 220 of the induction heater IH at the lower portion of the cooking zone 210 formed on the upper plate 200 heats the cooking vessel 300 The temperature of the working coil 220 is sensed.

The cooling fan 120 is installed below the upper plate of the induction range 200 and cools the lower space of the upper plate to prevent the working coil 220 of the induction heater IH from being overheated.

The controller 130 operates the cooling fan 120 to measure the temperature around the working coil 220 when the temperature around the working coil 220 is determined to be over the heating temperature (for example, 55 ° C) If it is determined that there is the cooking container 300 on the cooking zone 210 during the operation of the cooling fan 120 by preventing the working coil 220 from being overheated by lowering the heating temperature to below the overheating temperature, The cooling fan 120 is gradually operated in the intermittent operation mode in which the cooling fan 120 is operated and stopped at intervals of the operation time (for example, 5 minutes) to warm the food.

The overheat temperature is a predetermined temperature for determining whether the working coil 220 is overheated. The overheat temperature is a predetermined temperature for detecting the size or the number of the working coil 220 included in the induction range 200, It is desirable to set it in consideration of performance and the like.

If the temperature around the working coil 220 is determined to be equal to or higher than the overheat temperature (for example, 55 占 폚) + the cooking warm keeping use temperature (for example, 5 占 폚) in the state where cooking is completed, the controller 130 controls the overheat temperature , 55 < 0 > C), thereby preventing the working coil 220 from overheating.

For reference, the temperature for keeping the cooking food at a temperature is a temperature for determining the temperature range to be used for heating the food by gradually operating the cooling fan 120 in the intermittent operation mode when the working coil 220 is above the overheat temperature, It is preferable to set it appropriately in accordance with the overheating temperature.

If the temperature in the vicinity of the working coil 220 is determined to be less than the overheat temperature (for example, 55 占 폚) + the cooking warm keeping use temperature (for example, 5 占 폚) in the state where cooking is finished, the controller 130 controls the cooking zone 210 ) Of the cooking container (300).

If it is determined that there is no cooking vessel 300 on the cooking zone 210, the controller 130 continues to operate the cooling fan 210 until the temperature of the cooking vessel 300 becomes less than the overheat temperature (for example, 55 ° C.) ).

If it is determined that the cooking container 300 exists on the cooking zone 210, the controller 130 gradually operates the cooling fan 210 in the intermittent operation mode until the temperature becomes less than the overheat temperature (for example, 55 ° C.) Let the food warm.

The control unit 130 stops the operation of the cooling fan 120 and stops the operation of the residual heat display unit 140 when the temperature around the working coil 220 becomes less than the overheat temperature (for example, 55 ° C).

The residual heat display unit 140 displays the residual heat state of the lower space of the upper plate during operation of the cooling fan 120 as temperature.

The residual heat display unit 140 may be a display device (for example, an LED) for displaying the temperature of the residual heat by turning on or off, or a speaker for outputting a voice message.

The induction cooking chamber eccentric and overheat and improper cooking vessel sensing apparatus 100 according to the present invention constructed as above operates as follows.

Hereinafter, with reference to the embodiment shown in FIG. 3, the working coil protecting method for the induction range according to the present invention shown in FIG. 1 and the operation process (S100) of the food warming apparatus 100 will be described in detail.

The control unit 130 heats the working coil 220 of the induction heater IH when a heating output signal for heating the cooking vessel 300 to a user's desired temperature is inputted through the operation unit 230, At this time, the food inside the cooking container 300 is cooked.

When the cooking is finished, the user turns off the power switch of the operation unit 230 to cut off the high-frequency current supplied to the working coil 220.

Accordingly, the controller 130 confirms that the cooking is finished (S110).

Next, the controller 130 determines whether the temperature around the working coil 220 is equal to or higher than the overheat temperature (for example, 55 degrees Celsius) (S120).

At this time, if the temperature around the working coil 220 is determined to be equal to or higher than the overheat temperature (for example, 55 ° C) + the hot water keeping temperature (for example, 5 ° C) (S 130), the controller 130 controls the overheat temperature The operation of the cooling fan 120 is continued to prevent the working coil 220 from being overheated (S140) until the cooling fan 120 is operated, And displays the temperature on the residual heat display unit 140 (S152).

Alternatively, if the temperature around the working coil 220 is determined to be less than the overheat temperature (for example, 55 ° C) + the cooking warm keeping use temperature (for example, 5 ° C) (S 130), the controller 130 controls the cooking zone 210) to determine whether the cooking container 300 is present (S150).

The control unit 130 controls the operation of the cooking vessel 300 (for example, the heating vessel 300) through a resonance current detector (e.g., CT) of the induction heater IH after the high frequency alternating current is supplied to the working coil 220 of the induction heater IH The presence or absence of the cooking container 300 is determined by detecting a change in the resonance current, that is, a change in the high-frequency current of the working coil 220.

If the resonance current is less than the reference current value, it is determined that the cooking cavity 300 is present. That is, when the resonance current is less than the reference current value, Is not detected.

The resonance current detector (for example, CT) corresponds to the sensing part denoted by reference numeral 57 in FIG. 16 in the drawings of Patent Document 1, and a person skilled in the art will readily understand the structure and operation from the embodiment of Patent Document 1 You can.

At this time, if it is determined that there is no cooking container 300 on the cooking zone 210, the controller 130 continuously operates the cooling fan 210 until the temperature of the cooking container 300 is less than the overheating temperature (for example, 55 ° C.) The working coil 220 is prevented from being overheated at step S151 and the residual heat state of the lower space of the upper plate during the operation of the cooling fan 120 is displayed as the temperature in the residual heat display part 140 at step S152.

Alternatively, if it is determined that the cooking container 300 is present on the cooking zone 210, the control unit 130 controls the cooling fan 210 (e.g., 210) in the intermittent operation mode until the temperature is less than the overheating temperature (S153). During the operation of the cooling fan 120, the residual heat state of the lower space of the upper plate is displayed on the residual heat display unit 140 as temperature (S152).

When the temperature around the working coil 220 becomes less than the overheat temperature (for example, 55 ° C) (S120) as the cooling fan 120 operates as described above, the controller 130 operates the cooling fan 120 (S160) and the operation of the residual heat display unit 140 is stopped (S170).

As described above, the present invention prevents overheating of the working coil 220 after cooking of the induction range 200 is completed, so that the enamel coating layer protecting the working coil 220 is peeled off, Can be solved.

In addition, since the residual heat state of the space under the upper plate is indicated by the temperature display on the residual heat display unit 140, the risk of burn accident of the user who is not aware of the overheating can be prevented.

Particularly, in the present invention, when the cooking container 300 is provided in the cooking zone 2210, the food can be kept warm by slowly operating the cooling fan 120 in the intermittent operation mode until the temperature is less than the overheating temperature.

The working coil protecting and cooking device for induction range according to the present invention described above is not limited to the above-described embodiments, There is a technical spirit to the extent that anyone who has it can change it.

100: Working coil protection and induction heating device for induction range
110: Temperature sensor 120: Cooling fan
130: controller 140: residual heat indicator
200: Induction Range 210: Cooking Zone
220: Working coil 230:
300: cooking vessel

Claims (7)

A temperature sensor installed under the upper plate of the induction range and sensing a working coil ambient temperature while a working coil of induction heater (IH) is heated from below the cooking zone formed on the upper plate, ;
A cooling fan installed below the upper plate of the induction range for cooling the lower space of the upper plate to prevent the working coil of the induction heater IH from being overheated; And
If the temperature around the working coil is judged to be over the heating temperature when the cooking is completed, the cooling fan is operated to lower the temperature around the working coil to below the superheat temperature to prevent the working coil from overheating, A control unit for gradually heating the food by operating the cooling fan in an intermittent operation mode in which the cooling fan is operated and stopped at predetermined intermittent operation time intervals until it becomes less than the overheating temperature,
And a heating coil for heating the heating coil. The cooking apparatus according to claim 1, wherein, when cooking is finished, if the temperature around the working coil is determined to be overheat temperature + cooking warmer use temperature or more, the controller continuously operates the cooling fan until the temperature becomes less than the overheat temperature, Thereby preventing overheating of the heating coil. The induction cooking device according to claim 1, wherein the controller determines whether the cooking cavity is present on the cooking zone when the temperature around the working coil is determined to be lower than the overheat temperature + Protecting working coil for cooking and keeping food warm. 4. The induction cooking apparatus according to claim 3, wherein the controller controls the cooling fan to continuously operate the heating coil to prevent the heating coil from overheating until it is determined that there is no cooking container on the cooking zone, Protection and food warming devices. The induction cooking appliance according to claim 3, wherein the controller controls the operation of the cooling fan in the intermittent operation mode until the temperature of the cooking vessel is less than the overheating temperature, Protecting working coil for cooking and keeping food warm. 2. The induction heating system according to claim 1, wherein the control unit stops operation of the cooling fan when the temperature around the working coil becomes lower than the overheating temperature, and stops the operation of the residual heat display unit that displays the residual heat state of the space below the upper plate by temperature Protecting working coil for range and keeping food warm. The walking coil protecting and cooking thermostat according to claim 1, further comprising a residual heat indicator for indicating a residual heat state of the lower space of the upper plate during operation of the cooling fan by temperature.

Images