Induction heat cooking apparatus and method for driving the same

Patent metadata

Field	Value
Publication number	US-2016374151-A1
Application number	US-201615048371-A
Country	US
Kind code	A1
Filing date	Feb 19, 2016
Priority date	Jun 22, 2015
Publication date	Dec 22, 2016
Grant date	—

Abstract

An induction heat cooking apparatus includes a rectifier to rectify an input voltage and to output a DC voltage; a plurality of switching elements to switch the DC voltage output from the rectifier; a plurality of heating coils to heat a cooking container according to an operation of the plurality of switching elements; and a control part to control the plurality of switching elements, wherein the control part controls a time at which a switching element between a heating coil which is operated and a heating coil which is not operated among the plurality of heating coils is opened to be earlier than that of another switching element, such that power is not applied to the heating coil which is not operated.

First claim

What is claimed is:

1 . An induction heat cooking apparatus comprising:
a rectifier to rectify an input voltage and to output a DC voltage; a plurality of switching elements to switch the DC voltage output from the rectifier; a plurality of heating coils to heat a cooking container according to an operation of the plurality of switching elements; and a control part to control the plurality of switching elements, wherein the control part controls a time at which one of the plurality of switching elements between a heating coil which is operated and a heating coil which is not operated, among the plurality of heating coils, is opened to be earlier than that of other of the plurality of switching elements, such that power is not applied to the heating coil which is not operated.

2 . The apparatus according to claim 1 , wherein the control part controls a closed state of the one switching element to be shorter than half of a resonant period, and also controls each of the other switching elements to be in an opened state or a closed state during half of the resonant period.

3 . The apparatus according to claim 1 , wherein the plurality of heating coils comprise a first heating coil, a second heating coil, and a third heating coil,
wherein the plurality of switching elements comprise a first switching element, a second switching element, a third switching element, and a fourth switching element, and wherein the first heating coil is connected between the first switching element and the second switching element, and the second heating coil is connected between the second switching element and the third switching element, and the third heating coil is connected between the third switching element and the fourth switching element.

4 . The apparatus according to claim 3 , wherein, when the first heating coil is operated, the control part controls the first switching element to be in the closed state, and controls the second, the third, and the fourth switching elements to be in the opened state during a first half of a resonant period, and also controls the first switching element to be in the opened state, and controls the second, the third, and the fourth switching elements to be in the closed state during a second half of the resonant period, and
wherein the control part controls a time at which the second switching element is opened to be earlier than that of the third and the fourth switching elements.

5 . The apparatus according to claim 3 , wherein, when the second heating coil is operated, the control part controls the first and the second switching elements to be in the closed state, and controls the third and the fourth switching elements to be in the opened state during a first half of a resonant period, and also controls the first and the second switching elements to be in the opened state, and controls the third and the fourth switching elements to be in the closed state during a second half of the resonant period, and
wherein the control part controls a time at which the second and the third switching elements are opened to be earlier than that of the first and the fourth switching elements.

6 . The apparatus according to claim 3 , wherein, when the third heating coil is operated, the control part controls the first, the second, and the third switching elements to be in the closed state, and controls the fourth switching element to be in the opened state during a first half of a resonant period, and also controls the first, the second, and the third switching elements to be in the opened state, and controls the fourth switching element to be in the closed state during a second half of the resonant period, and
wherein the control part controls a time at which the third switching element is opened to be earlier than that of the first and the second switching elements.

7 . The apparatus according to claim 1 , wherein, when one of the plurality of heating coils is operated, the control part controls the other of the plurality of heating coils not to be operated.

8 . The apparatus according to claim 1 , wherein the control part controls a time at which the first switching element between the heating coil which is operated and the heating coil which is not operated is switched from a closed state to an opened state to be 1 to 1.5 ms earlier than that of another of the plurality of switching elements.

9 . An induction heat cooking apparatus comprising:
a rectifier to rectify an input voltage and to output a DC voltage; a plurality of switching elements to switch the DC voltage output from the rectifier; a plurality of heating coils to heat a cooking container according to an operation of the plurality of switching elements; and a control part to control the plurality of switching elements, wherein the control part controls each of the plurality of switching elements to be in an opened state or a closed state during half of a resonant period, and also controls a continuous time of the closed state of a switching element between a heating coil which is operated and a heating coil which is not operated among the plurality of heating coils to be shorter than that of another of the plurality of switching elements.

10 . The apparatus according to claim 8 , wherein the control part controls a continuous time of the closed state of the switching element between the heating coil which is operated and the heating coil which is not operated to be 1 to 1.5 ms shorter than that of other switching element.

11 . An induction heat cooking apparatus comprising:
a rectifier to rectify an input voltage and to output a DC voltage; a plurality of switching elements to switch the DC voltage output from the rectifier; a plurality of heating coils to heat a cooking container according to controlling of the plurality of switching elements; and a control part to control the plurality of switching elements according to a current value detected through a current converter, wherein the plurality of heating coils comprise a first heating coil, a second heating coil, and a third heating coil, wherein the plurality of switching elements comprise a first switching element, a second switching element, a third switching element, and a fourth switching element which are controlled to be alternately opened or closed, wherein one end of the first heating coil is connected to a connecting point between the first switching element and the second switching element, wherein one end of the second heating coil is connected to a connecting point between the second switching element and the third switching element, wherein one end of the third heating coil is connected to a connecting point between the third switching element and the fourth switching element, and when one of the plurality of heating coils is operated, the control part controls the other of the plurality of heating coils not to be operated, and also controls a continuous time of a closed state of a switching element of the plurality of switching elements between the heating coil which is operated and the heating coil which is not operated, among the first to third heating coils, to be shorter than half of a resonant period.

12 . The apparatus according to claim 11 , wherein a switching element of the plurality of switching elements which is controlled to have the same closing time as the switching element among the first to the fourth switching elements between the heating coil which is operated and the heating coil which is not operated, and
wherein the control part controls an opening time of the switching element between the heating coil which is operated and the heating coil which is not operated to be earli

Assignees

• Lg Electronics Inc

Inventors

• Ok Seungbok
• Oh Dooyong
• Yu Oksun
• Moon Hyunwook

Classifications

• H05B6/065 Primary

  using coordinated control of multiple induction coils · CPC title

• H05B1/0202

  Switches · 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

• H05B1/0266

  Cooktops · CPC title