KR100186425B1 - Inverter for induction heating combined with magnetic / non-magnetic type - Google Patents
Inverter for induction heating combined with magnetic / non-magnetic type Download PDFInfo
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- KR100186425B1 KR100186425B1 KR1019960020222A KR19960020222A KR100186425B1 KR 100186425 B1 KR100186425 B1 KR 100186425B1 KR 1019960020222 A KR1019960020222 A KR 1019960020222A KR 19960020222 A KR19960020222 A KR 19960020222A KR 100186425 B1 KR100186425 B1 KR 100186425B1
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- 238000010438 heat treatment Methods 0.000 title abstract description 13
- 230000006698 induction Effects 0.000 title abstract description 11
- 239000003990 capacitor Substances 0.000 abstract description 17
- 238000010411 cooking Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/04—Sources of current
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/05—Heating plates with pan detection means
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
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- Electromagnetism (AREA)
- General Induction Heating (AREA)
- Induction Heating Cooking Devices (AREA)
- Cookers (AREA)
Abstract
본 발명은 자성/비자성용기 겸용 유도가열용 인버터에 관한 것으로, 종래에는 자성모드일 경우 하나의 워킹코일만 사용하고 다른 워킹코일은 사용되지 않아서 용기의 일부분만이 가열되므로 워킹코일의 사용이 효율적이지 못하고, 자성 및 비자성 모드에 대해서 모두 만족시켜줄 수 있는 EMI필터 설계의 어려움이 따르고, 또한 워킹코일과 직렬연결된 공진커패시터의 전압정격이 너무 커서 부피도 커지도 가격 또한 상승하는 문제점이 있다. 따라서, 본 발명은 릴레이스위치를 이용하여 자성체일 경우에는 분할된 워킹코일이 병렬로 연결되도록 하고, 비자성체일 경우에는 한쪽 방향으로만 전류가 흐르도록 하여 자성 및 비자성 모드일 경우 워킹코일이 모두 사용되어져 용기의 전체면적이 가열되도록 하여 워킹코일의 사용 극대화를 추구하고, EMI필터 설계가 용이하도록 하며, 고압 커패시터를 사용하지 않고 가격을 다운시키도록 한다.The present invention relates to an induction heating inverter combined with a magnetic / non-magnetic coil, and conventionally, when only one working coil is used and only one working coil is used, only a part of the container is heated, In addition, there is a problem that the EMI filter design which satisfies both the magnetic and non-magnetic modes is difficult, and the price of the resonant capacitor connected in series with the working coil is too high to increase the volume. Accordingly, in the present invention, the divided working coils are connected in parallel in the case of a magnetic body using a relay switch, and in a non-magnetic body, a current flows in only one direction, So that the entire area of the container is heated so as to maximize the use of the working coil, to facilitate the design of the EMI filter, and to lower the price without using the high-voltage capacitor.
Description
제1도는 종래 자성용기 유도가열용 인버터회로도.FIG. 1 is a circuit diagram of an inverter for induction heating of a conventional magnetic container; FIG.
제2도는 제1도에서, 릴레이 제어시 각 진공소자와 동작모드를 보여주는 도표.FIG. 2 is a diagram showing the respective vacuum elements and the operating mode in relay control in FIG. 1; FIG.
제3도는 본 발명 자성/비자성용기 겸용 유도가열용 인버터회로도.FIG. 3 is a circuit diagram of an inverter for induction heating combined with a magnetic / non-magnetic machine according to the present invention.
제4도는 제3도에서, 릴레이 제어시 각 진공소자와 동작모드를 보여주는 도표.FIG. 4 is a diagram showing the respective vacuum elements and the operating mode in relay control in FIG. 3; FIG.
제5도는 제3도에서, 릴레이 오프시 스위치상태 및 워킹코일의 전류 파형도.5 shows a current waveform of the switching coil and a switching coil in a relay off state in Fig. 3; Fig.
* 도면의 주요부분에 대한 부호의 설명DESCRIPTION OF THE REFERENCE NUMERALS
L1,L2 : 워킹코일 S1,S2 : 스위칭소자L1, L2: working coil S1, S2: switching element
RLY : 릴레이 스위치 D1,D2 : 다이오드RLY: Relay switch D1, D2: Diode
Da1, Da2 : 보조 다이오드Da1, Da2: auxiliary diode
본 발명은 자성용기와 비자성용기 모두를 가열할 수 있도록 유도 가열용 인버터에 관한 것으로, 특히 자성 및 비자성모드를 릴레이의 온/오프에 의해 선택하여 각 모드에서 워킹코일의 이용을 극대화하며 비슷한 동작주파수에서 동작시킴에 의해서 입력 EMI필터설계를 용이하게 할 수 있는 자성/비자성용기 겸용 유도가열용 인버터에 관한 것이다.The present invention relates to an induction heating inverter capable of heating both a magnetic vessel and a non-magnetic working machine. In particular, the magnetic and non-magnetic modes are selected by on / off of a relay to maximize the use of a working coil in each mode, And more particularly, to an induction heating inverter having both magnetic and non-magnetic characteristics capable of facilitating an input EMI filter design by operating at a frequency.
종래 자성용기 유도가열용 인버터회로는, 제1도에 도시된 바와같이, 정류부(1)로 부터 공급되는 직류전압을 스위칭구동부(2)의 스위칭제어신호에 따라 스위칭하여 공진전압을 제공하는 정전원단자와 부전원단자 사이에 직렬연결되는 스위칭소자(S1)(S2)와, 두개로 분할되고 상기 스위칭소자(S1,S2) 사이에 연결되어 상기 정류부(1)로 부터 입력되는 공진전압에 의해 조리용기에 와전류를 유도시켜 그 조리용기 내의 음식물을 가열하는 워킹코일(L1)(L2)과 정전원단자와 부전원단자 사이에 직렬연결되어 입력되는 직류전압에 의해 워킹코일(L1)(L2)과 연속적으로 공진상태로 되어지는 공진커패시터(C2/2)(C2/2)와, 상기 워킹코일(L2)과 공진커패시터(C2/2)(C2/2) 사이에 직렬연결되어 각각의 용기에 따른 주파수를 변화시키는 공진커패시터(C3)와, 일측이 상기 워킹코일(L1)(L2) 사이에 연결되고 타측이 상기 공진커패시터(C2/2)(C2/2) 사이에 연결되어 워킹코일만 동작시키거나 두개의 워킹코일 모두를 동작시키도록 하는 릴레이 스위치(RLY)로 구성된다.As shown in FIG. 1, the conventional inverter circuit for induction heating of a magnetic container has a structure in which a DC voltage supplied from the rectifying section 1 is switched in accordance with a switching control signal of the switching driving section 2, A switching element S1 and S2 which are connected in series between a terminal and a negative power terminal, and a switching element S1 and S2 connected in series between the switching elements S1 and S2, A working coil L1 (L2) for inducing an eddy current in the vessel and heating the food in the cooking vessel, and a working coil L1 (L2) and a working coil L1 A resonance capacitor C2 / 2 (C2 / 2) that is continuously resonated is connected in series between the working coil L2 and the resonance capacitor C2 / 2 (C2 / 2) A resonance capacitor C3 for changing the frequency, and a resonance capacitor C3 having one side connected to the working coil L 1) L2 and the other side connected between the resonant capacitors C2 / 2 and C2 / 2 to operate only the working coil or both of the working coils. .
이와 같이 구성된 종래의 기술에 대하여 살펴보면 다음과 같다.The conventional technique configured as described above will be described as follows.
음식물을 담은 조리용기가 자성용기일 경우, 릴레이 스위치(RLY)가 온되어 하나의 워킹코일(L1)만 동작가능한 상태가 되고, 스위칭구동부(2)에 스위칭소자(S1)(S2)중 하나만 동작시키기 위한 스위칭제어신호를 발생시킨다.The relay switch RLY is turned on so that only one working coil L1 is operable and only one of the switching elements S1 and S2 is actuated in the switching driving section 2. In this case, And generates a switching control signal.
가령, 스위칭소자(S1)가 도통되면 스위칭소자(S2)는 차단되고 정류부(1)로 부터는 정류된 직류전압을 공급한다.For example, when the switching element S1 is turned on, the switching element S2 is cut off and the rectified voltage is supplied from the rectifying part 1.
이에 워킹코일(L2)과 공진커패시터(C2)가 연속적으로 공진상태가 되어진다.Then, the working coil L2 and the resonance capacitor C2 are continuously resonated.
따라서, 상기 워킹코일(L2)에는 큰 공진전류가 흐르게 된다.Therefore, a large resonance current flows through the working coil L2.
상기 공진전류에 의해 워킹코일(L2)에는 자장이 발생하고 그 자장에 의한 전자기 유도효과로 인해 조리용기에 와전류가 유도되어 조리용기가 가열되어짐에 따라 그 용기내의 음식물이 가열되어 원하는 요리가 진행된다.A magnetic field is generated in the working coil L2 due to the resonance current and an eddy current is induced in the cooking vessel due to the electromagnetic induction effect by the magnetic field so that the cooking vessel is heated so that the food in the vessel is heated and desired cooking proceeds .
자성용기이므로 스위칭소자의 도통 및 차단동작에 의해 25KHz의 주파수가 공진커패시터(C3)에 의해 발생하게 된다.Because of the magnetic container, the resonance capacitor C3 generates a frequency of 25 KHz due to the conduction and blocking operation of the switching element.
그리고, 조리용기가 비자성용기일 경우, 릴레이 스위치(RLY)가 오프되어 하나의 워킹코일(L1)(L2) 모두가 동작가능한 상태가 되고, 스위칭구동부(2)에서는 70KHz 이상의 높은 주파수를 발생하기 위하여 스위칭소자(S1)(S2)를 도통 및 차단하기 위한 스위칭제어신호를 발생시킨다.When the cooking container is a non-magnetic person, the relay switch RLY is turned off so that all of the working coils L1 and L2 are in an operable state. In order to generate a high frequency of 70 KHz or more in the switching driving unit 2 And generates a switching control signal for conducting and blocking the switching elements S1 and S2.
스위칭소자(S1)(S2)중 어느 하나가 도통되어 정류부(1)로 부터 직류전압이 제공되면 워킹코일(L1)(L2)과 공진커패시터(C2)가 연속적으로 공진상태가 되어진다.When any one of the switching elements S1 and S2 is turned on and a DC voltage is supplied from the rectifying section 1, the working coil L1 and the resonant capacitor C2 are continuously resonated.
따라서, 상기 워킹코일(L2)에는 큰 공진전류가 흐르게 된다.Therefore, a large resonance current flows through the working coil L2.
이때 공진커패시터(C3)에 의해 높은 주파수가 발생하게 된다.At this time, a high frequency is generated by the resonance capacitor C3.
상기 공진전류에 의해 워킹코일(L1)(L2)에는 자장이 발생하고 그 자장에 의한 전자기 유도효과로 인해 조리용기에 와전류가 유도되어 조리용기가 가열되어짐에 따라 그 용기내의 음식물이 가열되어 원하는 요리가 진행된다.A magnetic field is generated in the working coils L1 and L2 due to the resonance current and an eddy current is induced in the cooking vessel due to the electromagnetic induction effect by the magnetic field so that the food in the vessel is heated, .
상기에서와 같이 릴레이 스위치의 온/오프 동작시 각 진공소자와 동작 모드는 제2도에 도시한 도표에 나타내었다.As described above, the operation modes of the respective vacuum devices in the on / off operation of the relay switch are shown in the diagram shown in FIG.
그러나, 상기에서와 같은 종래의 기술에 있어서, 자성모드일 경우 워킹코일(L2)만 사용하고 다른 워킹코일(L1)은 사용되지 않아서 용기의 일부분만이 가열되므로 워킹코일의 사용이 효율적이지 못하고, 자성 및 비자성 모드에 대해서 모두 만족시켜줄 수 있는 EMI필터 설계의 어려움이 따르고, 또한 공진커패시터(C3)의 전압정격이 너무 커서 부피고 커지고 가격 또한 상승하는 문제점이 있다.However, in the conventional technology as described above, when only the working coil L2 is used and the other working coil L1 is not used in the magnetic mode, only a part of the container is heated, so that the use of the working coil is not efficient, There is a problem in designing an EMI filter that can satisfy both the magnetic and non-magnetic modes, and the voltage rating of the resonance capacitor C3 is too large to increase the volume and increase the price.
따라서, 본 발명의 목적은 자성 및 비자성용기를 겸용으로 사용하는 경우 워킹코일의 사용을 극대화하고 EMI필터 설계가 용이하도록 한 자성/비자성용기 겸용 유도가열용 인버터를 제공함에 있다.Accordingly, it is an object of the present invention to provide an induction heating inverter for both magnetic and non-magnetic use, which maximizes the use of a working coil and facilitates the design of an EMI filter when both magnetic and non-magnetic working machines are used.
상기 목적을 달성하기 위한 본 발명의 자성/비자성용기 겸용 유도가 열용 인버터회로 구성은, 제3도에 도시한 바와같이, 병렬로 분할된 워킹코일(L1)(L2)의 한쪽이 스위칭소자(S1)(S2)의 사이에 공동으로 연결되고, 상기 워킹코일(L1)(L2)의 다른 한쪽에 있는 두 단자 사이에 릴레이 스위치(RLY)와 보조 다이오드(Da1)(Da2)가 연결되어 구성한다.In order to achieve the above object, the inductive heating circuit for both magnetic and non-magnetic induction heating according to the present invention is characterized in that one of the working coils L1 and L2 divided in parallel is connected to a switching element S1 And the relay switch RLY and the auxiliary diodes Da1 and Da2 are connected between the two terminals of the other of the working coils L1 and L2.
이와같이 구성된 본 발명의 동작 및 작용효과에 대하여 상세히 설명하면 다음과 같다.The operation and effect of the present invention will be described in detail as follows.
사용자가 원하는 요리를 하고자 음식물을 조리용기에 담아 유도가열 조리기에 올려놓게 되는데 그 조리용기가 자성체일 경우, 릴레이 스위치(RLY)가 온되어 워킹코일(L1)(L2)이 병렬(L1//L2) 연결되어 이 값과 공진 커패시터(C2)에 의한 공진주파수가 형성되고, 이 공진주파수에 준하는 동작주파수가 형성된다.When the cooking container is a magnetic body, the relay switch RLY is turned on so that the working coil L1 (L2) is connected in parallel (L1 // L2 ), And this value and the resonance frequency by the resonance capacitor C2 are formed, and an operation frequency corresponding to this resonance frequency is formed.
그리고, 조리용기가 비자성체일 경우, 릴레이 스위치(RLY)가 오프되므로 두개로 분할된 워킹코일(L1)(L2)이 분리되어 각 전류의 방향에 따라 워킹코일(L1)과 공진 커패시터(C2) 또는 워킹코일(L2)와 공진커패시터(C2)에 의한 공진주파수가 형성되고, 이 공진주파수에 준하는 동작주파수가 형성된다.When the cooking container is a non-magnetic body, the relay switch RLY is turned off. Therefore, the two working coils L1 and L2 are separated, and the working coil L1 and the resonant capacitor C2, Or the resonance frequency is formed by the working coil L2 and the resonance capacitor C2, and an operating frequency corresponding to the resonance frequency is formed.
가령, 조리용기가 비자성체일 경우 릴레이 스위치(RLY)가 오프될 때 제5도의 (a)에서와 같이 스위칭소자(S1)의 베이스로 하이신호가 인가되어 온되고, (b)에서와 같이 로우신호가 인가되어 스위칭소자(S2)가 오프되며, 두개의 보조 다이오드(Da1)(Da2)가 (c)(d)에서와 같이 될때, 상기 스위칭소자(S1)에 의해 워킹코일(L1)(L2)로 전류가 흐르게 되는데, 상기 워킹코일(L1)(L2)의 전류(iL1)(iL2)는 제3도에서와 같이 한 방향으로 흐르게 된다.For example, when the cooking vessel is a non-magnetic body, when the relay switch RLY is turned off, a high signal is applied to the base of the switching element S1 as shown in FIG. 5 (a) When the switching element S2 is turned off and the two auxiliary diodes Da1 and Da2 are turned on as shown in (c) and (d), the switching element S1 turns on the working coil L1 The current i L1 (i L2 ) of the working coil L1 (L2) flows in one direction as shown in FIG.
따라서, 조리용기가 자성체이건 비자성체이건 분할된 두개의 워킹코일(L1)(L2)이 모두 사용되어져 용기의 전체면적이 가열되어진다.Therefore, the two working coils L1 and L2, whether divided into a magnetic body or a non-magnetic body, are all used to heat the entire area of the container.
즉, 제4도에서와 같이 릴레이 스위치(RLY)가 온되어 자성모드로 동작할 경우 워킹코일(L1)(L2)은 병렬로 연결되어 공진커패시터와 동작하게 되고, 상기 릴레이 스위치(RLY)가 오프되어 비자성모드로 동작할 경우 두개의 보조 다이오드(Da1)(Da2)에 의해 전류가 보조다이오드(Da1)→워킹코일(L1) 또는 워킹코일(L2)→보조 다이오드(Da2)와 같이 한쪽 방향으로만 전류가 흐르게 되어 결국은 워킬코일이 모두 사용되어져 용기의 전체가 가열된다.4, when the relay switch RLY is turned on and operates in the magnetic mode, the working coils L1 and L2 are connected in parallel to operate with the resonant capacitor, and when the relay switch RLY is turned off The current flows from the auxiliary diode Da1 to the working coil L1 or the working coil L2 to the auxiliary diode Da2 in one direction only by the two auxiliary diodes Da1 and Da2 The electric current flows, and eventually the whole of the container is heated by using all of the warp coils.
이와같이 한쪽 방향으로 전류가 흐르게 되므로 제5도의 (e)에서와 같이 반주기동안에는 전류 iL1가 흐르고, 다시 반주기 동안에는 전류 iL2가 흐르게 된다.As the current flows in one direction in this way, the current i L1 flows during the half period and the current i L2 flows during the half period as shown in FIG. 5 (e).
결국 자성모드로 동작할때와 비자성모드로 동작할 때 얻어지는 워킹코일의 인덕턴스가 비슷한 값을 갖기 때문에 EMI필터 설계가 쉬워진다.As a result, the EMI filter design becomes easy because the inductance of the working coil obtained when operating in magnetic mode and non-magnetic mode is similar.
이상에서 상세히 설명한 바와같이 본 발명은 자성 및 비자성 겸용 유도가열조리기에 있어서 워킹코일의 사용을 극대화시키고, EMI필터 설계를 용이하게 하며, 비싼 커패시커를 사용하지 않아도 가격을 낮출 수 있는 효과가 있다.As described in detail above, the present invention maximizes the use of a working coil in induction heating cookers for both magnetic and non-magnetic induction, facilitates the design of EMI filters, and reduces the cost without using an expensive capacitor .
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960020222A KR100186425B1 (en) | 1996-06-07 | 1996-06-07 | Inverter for induction heating combined with magnetic / non-magnetic type |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960020222A KR100186425B1 (en) | 1996-06-07 | 1996-06-07 | Inverter for induction heating combined with magnetic / non-magnetic type |
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| Publication Number | Publication Date |
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| KR980007845A KR980007845A (en) | 1998-03-30 |
| KR100186425B1 true KR100186425B1 (en) | 1999-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1019960020222A KR100186425B1 (en) | 1996-06-07 | 1996-06-07 | Inverter for induction heating combined with magnetic / non-magnetic type |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110006529A (en) * | 2009-07-14 | 2011-01-20 | 엘지전자 주식회사 | Induction heating electric cooker with single inverter |
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1996
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110006529A (en) * | 2009-07-14 | 2011-01-20 | 엘지전자 주식회사 | Induction heating electric cooker with single inverter |
| KR101659000B1 (en) | 2009-07-14 | 2016-09-23 | 엘지전자 주식회사 | Indution Heating Cooktop with a single inverter and Control Method thereof |
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