Induction heating device and method for controlling the same

Patent metadata

Field	Value
Publication number	US-11265975-B2
Application number	US-201816018225-A
Country	US
Kind code	B2
Filing date	Jun 26, 2018
Priority date	Jun 26, 2017
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

The present disclosure relates to an induction heating device and a method for controlling the same. In accordance with the present disclosure, first, inductive sensing is periodically performed to detect a specific object with inductive heating property. Next, current sensing of the specific object having the inductive heating property is performed to again check whether the specific object has the inductive heating property. Thus, when the user simply places the loaded object on the device, the device may allow the user to quickly and intuitively confirm whether the corresponding loaded object has the inductive heating property.

First claim

What is claimed is:

1. An induction heating device comprising:
a loading plate having one or more heating regions;
one or more working coils provided below the loading plate, the working coils corresponding to, respectively, the heating regions;
one or more sensing coils, each of the sensing coils being provided concentrically with and surrounded by respective ones of the working coils; and
a controller to determine whether a cooking vessel positioned on one of the heating regions has an inductive heating property via at least one of current sensing using one of the working coils corresponding to the heating region for the cooking vessel, or inductive sensing using one of the sensing coils corresponding to the one of the working coils,
wherein the controller is configured to repeatedly perform the inductive sensing in each of the heating regions at a prescribed sensing interval, and upon determining from the inductive sensing that the cooking vessel having the inductive heating property is positioned on the heating region, the controller is configured to perform the current sensing of the cooking vessel using the working coil corresponding to the heating region on which the cooking vessel is placed,
wherein only upon determination that the cooking vessel having the inductive heating property is positioned on the heating region from the inductive sensing and the current sensing, the controller is configured to perform a heating operation of the cooking vessel by the corresponding working coil,
wherein an amount of consumed power for the inductive sensing is set to be less than an amount of consumed power amount for the current sensing,
wherein the controller is configured to determine whether or not the loaded object has inductive heating property based on at least one of an inductance value or a current phase of the sensing coil when a current is applied to the sensing coil, and
wherein the controller is configured to determine whether or not the loaded object has inductive heating property based on a magnitude of eddy current of the working coil when a current is applied to the working coil.

2. The induction heating device of claim 1 , wherein the one or more heating regions includes a plurality of heating regions, and wherein the controller is further to perform the current sensing at all of the heating regions when the induction heating device is initially activated.

3. The induction heating device of claim 1 , wherein the controller, when determining whether the cooking vessel has the inductive heating property using the current sensing, is further to:
apply the current to the working coil, and
when the magnitude of eddy current generated in the cooking vessel while the current is applied to the working coil exceeds a reference value, determine that the cooking vessel has the inductive heating property.

4. The induction heating device of claim 1 , wherein the controller, when determining whether the cooking vessel has the inductive heating property using the induction sensing, is further to:
apply the current to the sensing coil, and
when a phase change of the current applied to the sensing coil exceeds a reference value, determine that the cooking vessel has the inductive heating property.

5. The induction heating device of claim 1 , wherein the controller, when determining whether the cooking vessel has the inductive heating property using the induction sensing, is further to:
apply the current to the sensing coil, and
when the inductance value measured in the sensing coil when the current is applied to the sensing coil exceeds a reference value, determine that the cooking vessel has the inductive heating property.

6. The induction heating device of claim 1 , further comprising:
a display to provide an indication of whether the cooking vessel has the inductive heating property.

7. The induction heating device of claim 6 , wherein the display further provides an indication of the corresponding one of the heating areas where the cooking vessel is positioned.

8. The induction heating device of claim 1 , further comprising:
a cylindrical body having a first receiving space defined therein; and
a cylindrical magnetic core received in the first receiving space,
wherein the magnetic core has a second receiving space defined therein, and
wherein the sensing coil is wound on an outer face of the body.

9. The induction heating device of claim 8 , wherein the sensing coil is wound on the outer face of the body by a first winding count, and the working coil is wound by a second winding count that is greater than the first winding count of the sensing coil.

10. The induction heating device of claim 8 , further comprising a temperature sensor received in the second receiving space to detect a temperature of the cooking vessel.

11. The induction heating device of claim 10 , wherein the body includes an internal flange to support the magnetic core, the internal flange includes a wire hole defined therein, and a wire connected to the temperature sensor in the second receiving space passes through the wire hole and out of the body.

12. A method for controlling an induction heating device, wherein the method comprises:
performing inductive sensing repeatedly in each of one or more heating regions at a prescribed sensing interval;
when a cooking vessel is determined, based on the inductive sensing, to be provided in one of the heating regions and to have an inductive heating property, performing current sensing of the cooking vessel; and
upon verifying based the current sensing that the cooking vessel has the inductive heating property, managing the heating region to perform an inductive heating operation on the cooking vessel,
wherein performing the current sensing includes, upon determining from the inductive sensing that the cooking vessel is positioned on the heating region and has the inductive heating property, performing the current sensing using a working coil corresponding to the heating region on which the cooking vessel is positioned,
wherein an amount of consumed power for the inductive sensing is set to be less than an amount of consumed power amount for the current sensing,
wherein when the inductive sensing is performed, whether or not the loaded object has inductive heating property is determined based on at least one of an inductance value or a current phase of the sensing coil when a current is applied to the sensing coil, and
wherein when the current sensing is performed, whether or not the loaded object has inductive heating property is determined based on a magnitude of eddy current of the working coil when a current is applied to the working coil.

13. The method of claim 12 , wherein the method further comprises:
performing initial current sensing of all of heating-regions included in the induction heating device;
determining based the initial current sensing whether the cooking vessel has the inductive heating property; and
performing the heating operation of the cooking vessel determined to have the inductive heating property.

14. The method of claim 12 , further comprising:
displaying an indication of whether the cooking vessel is determined to have the inductive heating property.

15. The method of claim 12 , wherein:
the heating region includes a working coil having a first length and a first number of windings, and a sensing coil having a second length that is less than the first length and a second number of windings that is less than the first number of windings,
performing the inductive sensing includes providing a first current to the sensing coil, and
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Assignees

• Lg Electronics Inc

Inventors

• Jang Ho Yong
• Kang Byeong Geuk
• Heo Jea Shik

Classifications

• H05B2213/07

  Heating plates with temperature control means · CPC title

• H05B6/062 Primary

  for cooking plates or the like · CPC title

• H05B2213/05

  Heating plates with pan detection means · CPC title

• H05B6/1209

  induction cooking plates or the like and devices to be used in combination with them · CPC title

• F24C9/00

  Stoves or ranges heated by a single type of energy supply not covered by groups F24C3/00 - F24C7/00 or subclass F24B (solar heat collectors for heating objects, e.g. solar cookers F24S20/30) · CPC title