Loaded-object sensor and induction heating device including loaded-object sensor

Patent metadata

Field	Value
Publication number	US-2018376540-A1
Application number	US-201816018203-A
Country	US
Kind code	A1
Filing date	Jun 26, 2018
Priority date	Jun 26, 2017
Publication date	Dec 27, 2018
Grant date	—

Abstract

The present disclosure relates to a loaded-object sensor and an induction heating device including the loaded-object sensor. The loaded-object sensor has a cylindrical hollow body with a sensing coil wound on its outer surface. Further, a receiving space formed inside the body of the loaded-object sensor accommodates a temperature sensor. The loaded-object sensor is concentrically provided in a central region of the working coil. The sensor may measure the temperature of the loaded object while discriminating a type of the loaded object placed on a corresponding position to the working coil.

First claim

What is claimed is:

1 . An induction heating device comprising:
a loading plate; a working coil provided to heat a cooking vessel on the loading plate using an inductive current; a sensor provided concentrically within the working coil, wherein the sensor includes:
a cylindrical body having a first receiving space defined therein;
a cylindrical magnetic core received in the first space, wherein the magnetic core has a second receiving space defined therein; and
a sensing coil wound on an outer face of the body by a first winding count; and
a controller that determines, based on applying a sensing current to the sensing coil, when the cooking vessel is on the loading plate and whether the cooking vessel has an inductive heating property.

2 . The induction heating device of claim 1 , further comprising a temperature sensor received in the second receiving space to detect a temperature of the cooking vessel.

3 . The induction heating device of claim 1 , wherein the cylindrical hollow body has an internal flange to support the magnetic core.

4 . The induction heating device of claim 3 , wherein the internal flange has 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.

5 . The induction heating device of claim 1 , wherein when a phase change measured in the sensing current applied to the sensing coil exceeds a reference value, the controller determines that the cooking vessel has the inductive heating property.

6 . The induction heating device of claim 1 , wherein the controller further:
identifies an inductance value associated with the sensing current applied to the sensing coil, and when the inductance value exceeds a reference value, determines that the cooking vessel has the inductive heating property.

7 . The induction heating device of claim 1 , further comprising a coil base to fix the working coil thereto.

8 . The induction heating device of claim 1 , wherein the sensing current is smaller than the induction current.

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

11 . An induction heating device comprising:
a loading plate; a working coil provided to heat a cooking vessel on the loading plate using an inductive current; a cylindrical body having a first receiving space defined therein, the body being positioned in the working coil; a sensing coil wound on an outer face of the body by a first winding count that is smaller than a second winding count for the working coil; and a controller that determines, based on applying a sensing current to the sensing coil, whether the cooking vessel has an inductive heating property.

12 . The induction heating device of claim 11 , further comprising:
a cylindrical magnetic core received in the first receiving space, wherein the magnetic core has a second receiving space defined therein; and a temperature sensor received in the second receiving space to detect a temperature of the cooking vessel.

13 . The induction heating device of claim 12 , wherein the cylindrical hollow body has an internal flange to support the magnetic core.

14 . The induction heating device of claim 13 , wherein the internal flange has 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.

15 . The induction heating device of claim 11 , wherein when a phase change measured in the sensing current applied to the sensing coil exceeds a reference value, the controller determines that the cooking vessel has the inductive heating property.

16 . The induction heating device of claim 11 , wherein the controller further:
identifies an inductance value associated with the sensing current applied to the sensing coil, and when the inductance value exceeds a reference value, determines that the cooking vessel has the inductive heating property.

17 . The induction heating device of claim 11 , wherein the sensing current is smaller than the induction current.

18 . The induction heating device of claim 11 , further comprising:
a display to provide an indication of whether the cooking vessel has the inductive heating property.

19 . The induction heating device of claim 19 , wherein the display further provides an indication of a level induction applied by the working coil to the cooking vessel.

20 . The induction heating device of claim 11 , wherein the inductive heating property indicates whether the cooking vessel is positioned on the loading plate and includes a material that forms an eddy current based on the induction current in the working coil.

Assignees

• Lg Electronics Inc

Inventors

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

Classifications

• H05B2213/05

  Heating plates with pan detection means · CPC title

• H05B1/0266

  Cooktops · CPC title

• H05B2213/07

  Heating plates with temperature control means · CPC title

• H05B6/1236

  adapted to induce current in a coil to supply power to a device and electrical heating devices powered in this way · CPC title

• H05B6/062 Primary

  for cooking plates or the like · CPC title