JP3185490B2 - High frequency induction heating device - Google Patents
High frequency induction heating deviceInfo
- Publication number
- JP3185490B2 JP3185490B2 JP22407093A JP22407093A JP3185490B2 JP 3185490 B2 JP3185490 B2 JP 3185490B2 JP 22407093 A JP22407093 A JP 22407093A JP 22407093 A JP22407093 A JP 22407093A JP 3185490 B2 JP3185490 B2 JP 3185490B2
- Authority
- JP
- Japan
- Prior art keywords
- capacitors
- frequency induction
- induction heating
- heating
- substantially equal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- General Induction Heating (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は高周波誘導加熱装置の
整合コンデンサ，加熱コイル及び配線ケーブルが、周波
数が高いために、発生する表皮効果等による損失を減ら
し加熱効率を向上させた高周波誘導加熱装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency induction heating apparatus in which a matching capacitor, a heating coil and a wiring cable of a high-frequency induction heating apparatus have a high frequency, thereby reducing a loss caused by a skin effect or the like and improving a heating efficiency. About.
【０００２】[0002]
【従来の技術】高周波誘導加熱装置の従来例を図５にも
とづいて説明する。この図は、代表的なトランジスタ式
電圧形インバータを電圧形インバータ装置１の主回路構
成にした、高周波誘導加熱装置の構成図である。この図
において、２は商用周波電源を直流電源に変換する整流
器、３は平滑用の直流コンデンサ、４は直流電源を高周
波の電源に変換する電圧形インバータであり、５は整合
コンデンサ、６は被加熱物８を誘導加熱するための加熱
コイルで、７は電圧形インバータ装置１と前記整合コン
デンサ，加熱コイルとを接続する配線ケーブルである。2. Description of the Related Art A conventional high-frequency induction heating apparatus will be described with reference to FIG. FIG. 1 is a configuration diagram of a high-frequency induction heating device in which a typical transistor-type voltage-type inverter has a main circuit configuration of the voltage-type inverter device 1. In this figure, 2 is a rectifier for converting commercial frequency power to DC power, 3 is a DC capacitor for smoothing, 4 is a voltage source inverter for converting DC power to high frequency power, 5 is a matching capacitor, and 6 is a capacitor. A heating coil for induction heating the heating object 8 is a wiring cable for connecting the voltage-type inverter device 1 to the matching capacitor and the heating coil.
【０００３】従来は前記加熱コイルに水冷の導体、たと
えば銅パイプが使用され、これはコイルの構造を強く
し、冷却効果を上げるためにはよいが、表皮効果及び電
磁力の影響で、流れる電流は断面全域に流れず、コイル
内側の一部分にしか流れないため加熱コイル内の発生損
失が大きくなっている。Conventionally, a water-cooled conductor such as a copper pipe is used for the heating coil, which is good for strengthening the structure of the coil and increasing the cooling effect. Does not flow in the entire cross-section, but flows only in a part of the inside of the coil, so that the loss generated in the heating coil is large.
【０００４】[0004]
【発明が解決しようとする課題】上述の従来の高周波誘
導加熱装置において、被加熱物を誘導加熱する加熱効率
は５０〜６０％である。この発明は前記の欠点を除去す
る、加熱効率を向上させた高周波誘導加熱装置を提供す
ることを目的とする。In the above-mentioned conventional high-frequency induction heating apparatus, the heating efficiency of induction heating of the object to be heated is 50 to 60%. SUMMARY OF THE INVENTION An object of the present invention is to provide a high-frequency induction heating apparatus which eliminates the above-mentioned disadvantages and has improved heating efficiency.
【０００５】[0005]
【課題を解決するための手段】前記目的を達成するため
に、第１の発明では、電圧形インバータ装置と整合コン
デンサと加熱コイルとからなる高周波誘導加熱装置にお
いて、前記整合コンデンサに複数個のコンデンサを使用
するとともに、それぞれの配線ケーブル及び前記複数個
のコンデンサと同数の加熱コイルを細銅線または細銅線
をよりあわせたリッツ線を用いて複数のＬ−Ｃ直列共振
回路を形成し、該Ｌ−Ｃ直列共振回路を並列の回路配線
にするとともに、各Ｌ，Ｃの値をほぼ等しくして各Ｌ−
Ｃ直列共振回路に流れる電流をほぼ等しくし、前記複数
の加熱コイルを近接配置して束ね単一の被加熱物を加熱
するようにする。また、第２の発明では、電圧形インバ
ータ装置と整合トランスと整合コンデンサと加熱コイル
とからなる高周波誘導加熱装置において、前記整合コン
デンサに複数個のコンデンサを使用するとともに、それ
ぞれの配線ケーブル及び前記複数個のコンデンサと同数
の加熱コイルを細銅線または細銅線をよりあわせたリッ
ツ線を用いて複数のＬ−Ｃ直列共振回路を形成し、該Ｌ
−Ｃ直列共振回路を並列の回路配線にするとともに、各
Ｌ，Ｃの値をほぼ等しくして各Ｌ−Ｃ直列共振回路に流
れる電流をほぼ等しくし、前記複数の加熱コイルを近接
配置して束ね単一の被加熱物を加熱するようにする。According to a first aspect of the present invention, there is provided a high frequency induction heating apparatus comprising a voltage type inverter device, a matching capacitor, and a heating coil. A plurality of L-C series resonance circuits are formed by using a thin copper wire or a litz wire obtained by twisting a thin copper wire with the same number of heating coils as the respective wiring cables and the plurality of capacitors, and The LC series resonance circuit is made parallel circuit wiring, and the values of L and C are made substantially equal to each other to make each L-C
The currents flowing through the C series resonance circuit are made substantially equal, and the plurality of heating coils are arranged close to each other to bundle and heat a single object to be heated. According to a second aspect of the present invention, in the high frequency induction heating device including a voltage source inverter device, a matching transformer, a matching capacitor, and a heating coil, a plurality of capacitors are used as the matching capacitors, and each of the wiring cables and the plurality of A plurality of LC series resonance circuits are formed by using a thin copper wire or a litz wire formed by twisting a thin copper wire with the same number of heating coils as the number of capacitors.
-C series resonance circuit is made parallel circuit wiring, and the values of L and C are made substantially equal to make the current flowing in each LC series resonance circuit substantially equal, and the plurality of heating coils are arranged close to each other. A single object to be heated is heated.
【０００６】また、第３の発明では、電流形インバータ
装置と整合コンデンサと加熱コイルとからなる高周波誘
導加熱装置において、前記整合コンデンサに複数個のコ
ンデンサを使用するとともに、それぞれの配線ケーブル
及び前記複数個のコンデンサと同数の加熱コイルを細銅
線または細銅線をよりあわせたリッツ線を用いて複数の
Ｌ−Ｃ並列共振回路を形成し、該Ｌ−Ｃ並列共振回路を
並列の回路配線にするとともに、各Ｌ，Ｃの値をほぼ等
しくして各Ｌ−Ｃ並列共振回路に流れる電流をほぼ等し
くし、前記複数の加熱コイルを近接配置して束ね単一の
被加熱物を加熱するようにする。また、第４の発明で
は、電流形インバータ装置と整合トランスと整合コンデ
ンサと加熱コイルとからなる高周波誘導加熱装置におい
て、前記整合コンデンサに複数個のコンデンサを使用す
るとともに、それぞれの配線ケーブル及び前記複数個の
コンデンサと同数の加熱コイルを細銅線または細銅線を
よりあわせたリッツ線を用いて複数のＬ−Ｃ並列共振回
路を形成し、該Ｌ−Ｃ並列共振回路を並列の回路配線に
するとともに、各Ｌ，Ｃの値をほぼ等しくして各Ｌ−Ｃ
並列共振回路に流れる電流をほぼ等しくし、前記複数の
加熱コイルを近接配置して束ね単一の被加熱物を加熱す
るようにする。According to a third aspect of the present invention, in a high-frequency induction heating apparatus comprising a current source inverter device, a matching capacitor and a heating coil, a plurality of capacitors are used for the matching capacitor, and each of the wiring cables and the plurality of capacitors is used. A plurality of L-C parallel resonance circuits are formed using a thin copper wire or a litz wire obtained by twisting a thin copper wire with the same number of heating coils as the number of capacitors, and the L-C parallel resonance circuit is connected to a parallel circuit wiring. At the same time, the values of L and C are made substantially equal to make the current flowing in each LC parallel resonance circuit substantially equal, and the plurality of heating coils are arranged in close proximity to bundle and heat a single object to be heated. To According to a fourth aspect of the present invention, in the high frequency induction heating device including the current source inverter device, the matching transformer, the matching capacitor, and the heating coil, a plurality of capacitors are used as the matching capacitor, and each of the wiring cables and the plurality of A plurality of L-C parallel resonance circuits are formed using a thin copper wire or a litz wire obtained by twisting a thin copper wire with the same number of heating coils as the number of capacitors, and the L-C parallel resonance circuit is connected to a parallel circuit wiring. And the values of L and C are made substantially equal, and
The current flowing through the parallel resonance circuit is made substantially equal, and the plurality of heating coils are arranged close to each other to bundle and heat a single object to be heated.
【０００７】[0007]
【作用】この発明においては、高周波誘導加熱装置の加
熱コイル及び接続ケーブルに流れる高周波電流で表皮効
果等が発生し、前記加熱コイル及び接続ケーブルの発生
損失が大きくなることを細銅線または細銅線をよりあわ
せたリッツ線を用いることで、発生損失を減らし、高周
波誘導加熱装置の加熱効率を向上させる。According to the present invention, a high-frequency current flowing through the heating coil and the connection cable of the high-frequency induction heating device causes a skin effect and the like, and the occurrence loss of the heating coil and the connection cable becomes large. By using a litz wire in which the wires are twisted, the generation loss is reduced, and the heating efficiency of the high-frequency induction heating device is improved.
【０００８】[0008]
【実施例】まず、図１はこの発明の第１の実施例を示
す。以下の図においては、図５と同一の構成要素には同
一符号を付して説明を省略し、以下、異なる部分を中心
に説明する。図１においては、電圧形インバータを電圧
形インバータ装置１の主回路構成にしている。整合コン
デンサは５ａ〜５ｎのｎ個で構成し、加熱コイルは６ａ
〜６ｎのｎ個から構成している。FIG. 1 shows a first embodiment of the present invention. In the following drawings, the same components as those in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, different portions will be mainly described. In FIG. 1, the voltage-source inverter has a main circuit configuration of the voltage-source inverter device 1. The matching capacitor is composed of n pieces of 5a to 5n, and the heating coil is 6a.
６6n.
【０００９】さらに、前記の整合コンデンサと加熱イル
と電圧形インバータ装置とを接続する配線ケーブル７
で、図５の従来例に示すような一組のＬ−Ｃ共振回路に
構成するのではなく、図１では、５ａ−５ｎ〜６ａ−６
ｎのｎ個のＬ−Ｃ直列共振回路を並列に接続する構成に
している。この図の場合、ａ〜ｎのｎ個のＬ−Ｃ直列共
振回路の加熱コイル６ａ〜６ｎおよび各接続ケーブル７
は流れる高周波電流の表皮効果による電流集中が起こら
ない程度の細い径の銅線を使用するか、又は細銅線をよ
りあわせたリッツ線を使用する。Further, a wiring cable 7 for connecting the matching capacitor, the heating il and the voltage source inverter device.
Therefore, instead of being configured as a set of LC resonance circuits as shown in the conventional example of FIG. 5, FIG. 1 shows 5a-5n to 6a-6.
The configuration is such that n n LC series resonance circuits are connected in parallel. In the case of this figure, the heating coils 6a to 6n of the n LC series resonance circuits a to n and the respective connection cables 7
Use a copper wire having a diameter small enough to prevent current concentration due to the skin effect of a flowing high-frequency current, or use a litz wire formed by twisting a thin copper wire.
【００１０】この発明の狙いは、上記のように構成し、
前記各Ｌ、Ｃの値をほぼ等しくすれば、各分岐毎に流れ
る電流がほぼ等しくなることに着目したことにあり、そ
の結果、直流電流による抵抗分損失と同程度の発生損失
しか生じることがなく、加熱効率を向上させた高周波誘
導加熱装置が構成できる。図２に、この発明の第２の実
施例を示し、図１と同じく電圧形インバータ装置１とし
て、電圧形インバータを主回路構成にしている。An object of the present invention is to provide the above-described configuration,
It is noted that if the values of the respective L and C are made substantially equal, the current flowing in each branch becomes substantially equal. As a result, only a loss equivalent to the resistance loss due to the DC current occurs. Thus, a high-frequency induction heating device with improved heating efficiency can be configured. FIG. 2 shows a second embodiment of the present invention. As in FIG. 1, a voltage-source inverter device 1 has a main circuit configuration of a voltage-source inverter.
【００１１】図２においては、電圧形インバータ装置１
と整合コンデンサ及び加熱コイルの間のインピーダンス
マッチングのため、整合トランス９を入れている。図２
においても、図１と同様に、整合コンデンサ５ａ〜５
ｎ、加熱コイル６ａ〜６ｎ及び接続ケーブル７をｎ個並
列に分割することにより、低損失になり加熱効率を向上
させた高周波誘導加熱装置が構成できる。In FIG. 2, a voltage source inverter 1
A matching transformer 9 is provided for impedance matching between the matching capacitor and the heating coil. FIG.
In the same manner as in FIG.
By dividing n, the heating coils 6a to 6n, and the n connection cables 7 in parallel, a high-frequency induction heating device having low loss and improved heating efficiency can be configured.
【００１２】図３に、この発明の第３の実施例を示す。
同図は、サイリスタ式電流形インバータを電流形インバ
ータ装置１１の主回路構成にしている。１２は商用周波
電源を直流電源に変換するサイリスタ整流器、１３は平
滑用の直流リアクトル、１４は直流電源を高周波の電源
に変換するサイリスタインバータである。図３において
は、整合コンデンサ５ａ〜５ｎ、加熱コイル６ａ〜６ｎ
をｎ個のＬ−Ｃ並列共振回路とし、接続ケーブル７もｎ
個に分割することにより、図１に示す電圧形インバータ
装置の場合と同様に、低損失になり加熱効率を向上させ
た高周波誘導加熱装置が構成できる。FIG. 3 shows a third embodiment of the present invention.
In the figure, a thyristor-type current source inverter has a main circuit configuration of a current source inverter device 11. Reference numeral 12 denotes a thyristor rectifier for converting a commercial frequency power supply to a DC power supply, 13 a DC reactor for smoothing, and 14 a thyristor inverter for converting the DC power supply to a high-frequency power supply. In FIG. 3, matching capacitors 5a to 5n, heating coils 6a to 6n
Are n LC parallel resonance circuits, and the connection cable 7 is also n
Dividing into individual pieces makes it possible to configure a high-frequency induction heating apparatus having low loss and improved heating efficiency, as in the case of the voltage source inverter apparatus shown in FIG.
【００１３】図４に、この発明の第４の実施例を示し、
図３と同じく電流形インバータ装置１１として、サイリ
スタ式電流形インバータを主回路構成にしている。図４
においては、電流形インバータ装置１１と整合コンナン
サ及び加熱コイルの間のインピーダンスマッチングのた
め、整合トランス１９を入れている。この図において
も、図３と同様に、整合コンデンサ５ａ〜５ｎ、加熱コ
イル６ａ〜６ｎをｎ個のＬ−Ｃ並列共振回路とし、接続
ケーブル７もｎ個に分割することにより、図１に示す電
圧形インバータ装置の場合と同様に、低損失になり加熱
効率を向上させた高周波誘導加熱装置が構成できる。FIG. 4 shows a fourth embodiment of the present invention.
A thyristor-type current source inverter has a main circuit configuration as the current source inverter device 11 as in FIG. FIG.
In the above, a matching transformer 19 is inserted for impedance matching between the current source inverter device 11 and the matching condenser and the heating coil. Also in this figure, as in FIG. 3, the matching capacitors 5a to 5n and the heating coils 6a to 6n are made into n LC parallel resonance circuits, and the connection cable 7 is also divided into n pieces, as shown in FIG. As in the case of the voltage-type inverter device, a high-frequency induction heating device having low loss and improved heating efficiency can be configured.
【００１４】[0014]
【発明の効果】以上のように、この発明は高周波誘導加
熱装置において、被加熱物を誘導加熱する加熱コイル内
及び接続ケーブル内の表皮効果等による発生損失を低減
し、加熱効率を向上させた誘導加熱装置を可能にする。
さらに、整合コンデンサを複数個に分割することで、小
形で安価なコンデンサが使用できる。As described above, according to the present invention, in the high-frequency induction heating apparatus, the loss caused by the skin effect in the heating coil and the connecting cable for induction heating the object to be heated is reduced, and the heating efficiency is improved. Enables induction heating equipment.
Further, by dividing the matching capacitor into a plurality, a small and inexpensive capacitor can be used.
【図１】この発明の第１の実施例を示す構成図FIG. 1 is a configuration diagram showing a first embodiment of the present invention.
【図２】この発明の第２の実施例を示す構成図FIG. 2 is a configuration diagram showing a second embodiment of the present invention.
【図３】この発明の第３の実施例を示す構成図FIG. 3 is a configuration diagram showing a third embodiment of the present invention.
【図４】この発明の第４の実施例を示す構成図FIG. 4 is a configuration diagram showing a fourth embodiment of the present invention.
【図５】従来例を示す構成図。FIG. 5 is a configuration diagram showing a conventional example.
１ 電圧形インバータ装置 ２ 整流器 ３ 直流コンデンサ ４ 電圧形インバータ ５ 整合コンデンサ ５ａ〜５ｎ 整合コンデンサ ６ 加熱コイル ６ａ〜６ｎ 加熱コイル ７ 配線ケーブル ８ 被加熱物 ９ 整合トランス １１ 電流形インバータ装置 １２ サイリスタ整流器 １３ 直流リアクトル １４ サイリスタ式電流形インバータ １９ 整合トランス REFERENCE SIGNS LIST 1 voltage source inverter device 2 rectifier 3 DC capacitor 4 voltage source inverter 5 matching capacitor 5 a to 5 n matching capacitor 6 heating coil 6 a to 6 n heating coil 7 wiring cable 8 object to be heated 9 matching transformer 11 current source inverter device 12 thyristor rectifier 13 DC Reactor 14 Thyristor type current source inverter 19 Matching transformer
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H05B 6/06 H05B 6/36 H05B 6/44 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) H05B 6/06 H05B 6/36 H05B 6/44
Claims (4)
加熱コイルとからなる高周波誘導加熱装置において、 前記整合コンデンサに複数個のコンデンサを使用すると
ともに、それぞれの配線ケーブル及び前記複数個のコン
デンサと同数の加熱コイルを細銅線または細銅線をより
あわせたリッツ線を用いて複数のＬ−Ｃ直列共振回路を
形成し、 該Ｌ−Ｃ直列共振回路を並列の回路配線にするととも
に、各Ｌ，Ｃの値をほぼ等しくして各Ｌ−Ｃ直列共振回
路に流れる電流をほぼ等しくし、前記複数の加熱コイル
を近接配置して束ね単一の被加熱物を加熱するようにし
たことを特徴とする高周波誘導加熱装置。1. A high-frequency induction heating apparatus comprising a voltage source inverter device, a matching capacitor and a heating coil, wherein a plurality of capacitors are used for the matching capacitor, and the same number of wiring cables and the plurality of capacitors are used. A plurality of LC series resonance circuits are formed by using a thin copper wire or a litz wire formed by twisting a thin copper wire as the heating coil, and the LC series resonance circuits are formed into parallel circuit wirings. The value of C is made substantially equal, the currents flowing through the respective LC series resonance circuits are made substantially equal, and the plurality of heating coils are arranged close to each other to bundle and heat a single object to be heated. High frequency induction heating equipment.
合コンデンサと加熱コイルとからなる高周波誘導加熱装
置において、 前記整合コンデンサに複数個のコンデンサを使用すると
ともに、それぞれの配線ケーブル及び前記複数個のコン
デンサと同数の加熱コイルを細銅線または細銅線をより
あわせたリッツ線を用いて複数のＬ−Ｃ直列共振回路を
形成し、 該Ｌ−Ｃ直列共振回路を並列の回路配線にするととも
に、各Ｌ，Ｃの値をほぼ等しくして各Ｌ−Ｃ直列共振回
路に流れる電流をほぼ等しくし、前記複数の加熱コイル
を近接配置して束ね単一の被加熱物を加熱するようにし
たことを特徴とする高周波誘導加熱装置。2. A high-frequency induction heating apparatus comprising a voltage source inverter device, a matching transformer, a matching capacitor, and a heating coil, wherein a plurality of capacitors are used as the matching capacitors, respective wiring cables and the plurality of capacitors. A plurality of L-C series resonance circuits are formed using the same number of heating coils as a thin copper wire or a litz wire formed by twisting a thin copper wire, and the LC series resonance circuits are formed into parallel circuit wirings, The values of L and C are made substantially equal to make the current flowing in each LC series resonance circuit substantially equal, and the plurality of heating coils are arranged close to each other to bundle and heat a single object to be heated. A high-frequency induction heating device characterized by the following.
加熱コイルとからなる高周波誘導加熱装置において、 前記整合コンデンサに複数個のコンデンサを使用すると
ともに、それぞれの配線ケーブル及び前記複数個のコン
デンサと同数の加熱コイルを細銅線または細銅線をより
あわせたリッツ線を用いて複数のＬ−Ｃ並列共振回路を
形成し、 該Ｌ−Ｃ並列共振回路を並列の回路配線にするととも
に、各Ｌ，Ｃの値をほぼ等しくして各Ｌ−Ｃ並列共振回
路に流れる電流をほぼ等しくし、前記複数の加熱コイル
を近接配置して束ね単一の被加熱物を加熱するようにし
たことを特徴とする高周波誘導加熱装置。3. A high-frequency induction heating device comprising a current source inverter device, a matching capacitor and a heating coil, wherein a plurality of capacitors are used for the matching capacitor, and the same number of wiring cables and the plurality of capacitors are used. A plurality of LC parallel resonance circuits are formed using a heating coil using a thin copper wire or a litz wire obtained by twisting a thin copper wire, and the LC parallel resonance circuit is formed as a parallel circuit wiring. The value of C is made substantially equal, the currents flowing through the respective LC parallel resonance circuits are made substantially equal, and the plurality of heating coils are arranged close to each other to bundle and heat a single object to be heated. High frequency induction heating equipment.
合コンデンサと加熱コイルとからなる高周波誘導加熱装
置において、 前記整合コンデンサに複数個のコンデンサを使用すると
ともに、それぞれの配線ケーブル及び前記複数個のコン
デンサと同数の加熱コイルを細銅線または細銅線をより
あわせたリッツ線を用いて複数のＬ−Ｃ並列共振回路を
形成し、 該Ｌ−Ｃ並列共振回路を並列の回路配線にするととも
に、各Ｌ，Ｃの値をほぼ等しくして各Ｌ−Ｃ並列共振回
路に流れる電流をほぼ等しくし、前記複数の加熱コイル
を近接配置して束ね単一の被加熱物を加熱するようにし
たことを特徴とする高周波誘導加熱装置。4. A high-frequency induction heating device comprising a current source inverter device, a matching transformer, a matching capacitor, and a heating coil, wherein a plurality of capacitors are used for the matching capacitors, respective wiring cables and the plurality of capacitors. A plurality of LC parallel resonance circuits are formed using the same number of heating coils as a thin copper wire or a litz wire formed by twisting a thin copper wire, and the LC parallel resonance circuit is formed as a parallel circuit wiring, The values of L and C are made substantially equal to make the current flowing in each LC parallel resonance circuit substantially equal, and the plurality of heating coils are arranged in close proximity to bundle and heat a single object to be heated. A high-frequency induction heating device characterized by the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22407093A JP3185490B2 (en) | 1993-09-09 | 1993-09-09 | High frequency induction heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22407093A JP3185490B2 (en) | 1993-09-09 | 1993-09-09 | High frequency induction heating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0778677A JPH0778677A (en) | 1995-03-20 |
| JP3185490B2 true JP3185490B2 (en) | 2001-07-09 |
Family
ID=16808098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22407093A Expired - Lifetime JP3185490B2 (en) | 1993-09-09 | 1993-09-09 | High frequency induction heating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3185490B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6421040B2 (en) | 1992-03-05 | 2002-07-16 | Seiko Epson Corporation | Drive method, a drive circuit and a display device for liquid crystal cells |
| US6452578B1 (en) | 1992-03-05 | 2002-09-17 | Seiko Epson Corporation | Liquid crystal element drive method, drive circuit, and display apparatus |
| US6483497B1 (en) | 1992-03-05 | 2002-11-19 | Seiko Epson Corporation | Matrix display with signal electrode drive having memory |
| US6542141B1 (en) | 1991-10-01 | 2003-04-01 | Hitachi, Ltd. | Liquid-crystal halftone display system |
-
1993
- 1993-09-09 JP JP22407093A patent/JP3185490B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6542141B1 (en) | 1991-10-01 | 2003-04-01 | Hitachi, Ltd. | Liquid-crystal halftone display system |
| US6421040B2 (en) | 1992-03-05 | 2002-07-16 | Seiko Epson Corporation | Drive method, a drive circuit and a display device for liquid crystal cells |
| US6452578B1 (en) | 1992-03-05 | 2002-09-17 | Seiko Epson Corporation | Liquid crystal element drive method, drive circuit, and display apparatus |
| US6483497B1 (en) | 1992-03-05 | 2002-11-19 | Seiko Epson Corporation | Matrix display with signal electrode drive having memory |
| US6611246B1 (en) | 1992-03-05 | 2003-08-26 | Seiko Epson Corporation | Liquid crystal element drive method, drive circuit, and display apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0778677A (en) | 1995-03-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114047411B (en) | Method and device for detecting high-voltage power cable line cross-connection state | |
| US20200051712A1 (en) | Interconnection for connecting a switched mode inverter to a load | |
| JP3185490B2 (en) | High frequency induction heating device | |
| JPH06315267A (en) | Power-factor improvement dc power supply | |
| US6278266B1 (en) | Symmetrical power generator and method of use | |
| JP4460572B2 (en) | Arc welding generator with high power factor | |
| JP2001231268A (en) | Power conversion device | |
| CN208623578U (en) | Improve the frequency changing driving system of common mode interference | |
| JPH073851B2 (en) | Parallel connection of power transistors | |
| CN110798123A (en) | Variable frequency driving system and method for improving common mode interference | |
| JP2000299020A (en) | Power supply facility and high frequency current cable thereof | |
| US20180083514A1 (en) | Apparatus for reduced voltage stress on ac motors and cables | |
| JP2000243593A (en) | X-ray apparatus and connecting conductor capable of using in it | |
| Ferreira et al. | Alternative power distribution in residential and commercial buildings | |
| JPH05263377A (en) | Litz wire | |
| CN218975259U (en) | Large-current multi-tap single-phase transformer | |
| JP2850810B2 (en) | Superconducting current limiting device | |
| JP3602334B2 (en) | Output current synthesis circuit and parallel inverter device | |
| CN114465511A (en) | Induction furnace and IGBT power supply for induction furnace | |
| Palmer et al. | Determination of the effect of harmonics on pipe-type power cable AC/DC resistance ratios | |
| JP3469056B2 (en) | Electrical equipment | |
| JP2001035724A (en) | High withstand voltage dc current flowing transformer | |
| KR890003616Y1 (en) | Electromagnetic heater | |
| Wilkins et al. | Effect of harmonic currents on semiconductor fuse ratings | |
| JP3447540B2 (en) | Distribution transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090511 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090511 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100511 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110511 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110511 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120511 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120511 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130511 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130511 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140511 Year of fee payment: 13 |