JPS58215975A - Inverter device - Google Patents
Inverter deviceInfo
- Publication number
- JPS58215975A JPS58215975A JP57096802A JP9680282A JPS58215975A JP S58215975 A JPS58215975 A JP S58215975A JP 57096802 A JP57096802 A JP 57096802A JP 9680282 A JP9680282 A JP 9680282A JP S58215975 A JPS58215975 A JP S58215975A
- Authority
- JP
- Japan
- Prior art keywords
- output
- inverter
- voltage
- regulator
- set value
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/443—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means
- H02M5/45—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M5/4505—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only having a rectifier with controlled elements
Abstract
Description
【発明の詳細な説明】
この発明は誘導加熱式の金属溶解炉等の電源として好適
なインバータ装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inverter device suitable as a power source for an induction heating type metal melting furnace or the like.
高周波誘導加熱炉あるいは°高周波誘導加熱装置におい
ては誘導加熱用のワークコイル内に装入される材料の爪
、温度等によってワークコイ、ルの電気的なインピーダ
ンスが大幅に変動する。そのだめ該加熱炉の電源として
使用される高周波インバータ装置は、出力電圧を安定さ
せるために、従来はインバータ電流の検出値とインバー
タ出力電圧の検出値とを負帰還して、設定値と突き合わ
せるいわゆるフィードバック制御を行なっていた。しか
し、上述のような従来のフィードバックを有するインバ
ータ装置は、ハンチングを防止し、系を安定に動作する
だめに、インバータ装置中における整流装置と高周波イ
ンバータとの間に設ける直流リアクトルを大きく選定す
る必要があり、コスト高となるとともに、過電圧、過電
流等に対する保護回路に対しても厳格な対策が必要であ
るという問題があった。In a high-frequency induction heating furnace or a high-frequency induction heating device, the electrical impedance of the work coil varies greatly depending on the temperature, etc. of the material charged into the work coil for induction heating. Therefore, in order to stabilize the output voltage of the high-frequency inverter device used as a power source for the heating furnace, conventionally, the detected value of the inverter current and the detected value of the inverter output voltage are negatively fed back to match the set value. It was performing so-called feedback control. However, in the conventional inverter device with feedback as described above, in order to prevent hunting and operate the system stably, it is necessary to select a large DC reactor between the rectifier and the high-frequency inverter in the inverter device. This poses a problem in that it increases costs and requires strict measures for protection circuits against overvoltage, overcurrent, and the like.
この発明は」二連の欠点を排除するためになされたもの
であって、誘導加熱炉のようにインピーダンス変動の大
きな負荷に対しても安定に作動し、かつ安価に構成でき
るインバータ装置を提供することを目的とするものであ
る。This invention was made in order to eliminate the two drawbacks, and provides an inverter device that operates stably even under loads with large impedance fluctuations, such as in induction heating furnaces, and can be constructed at low cost. The purpose is to
以下にこの発明の一実施例を図面とともに説明する。An embodiment of the present invention will be described below with reference to the drawings.
図において、１はインバータ装置、２は商用３相交流を
点弧角制御によって電圧可変の直流電圧に変換する整流
装置であって、３相ブリツジ接続されたサイリスタＵな
いしＺを備えている。該整流装置２の交流側端子は変圧
器３を介して商用３相交流電源に接続され、また直流側
端子は直流リアクトル４を介して高周波インバータ回路
５に接続される。インバータ回路５はサイリスタＡ、
Ｂ。In the figure, 1 is an inverter device, 2 is a rectifier that converts commercial three-phase AC into a variable DC voltage by controlling the firing angle, and is equipped with three-phase bridge-connected thyristors U to Z. The AC side terminal of the rectifier 2 is connected to a commercial three-phase AC power source via a transformer 3, and the DC side terminal is connected to a high frequency inverter circuit 5 via a DC reactor 4. The inverter circuit 5 includes a thyristor A,
B.
Ｃ，Ｄを有し、その出力端子は誘導加熱炉の炉コイル６
に接続されている。なお７は力率改善用コンデンサであ
る。C and D, the output terminals of which are connected to the furnace coil 6 of the induction heating furnace.
It is connected to the. Note that 7 is a power factor improving capacitor.
上述のインバータ装置１はサイリスタＵ、 Ｖ。The above-mentioned inverter device 1 includes thyristors U and V.
Ｗ、 Ｘ、 Ｙ、 Ｚの点弧位相の制御によって
、電圧制御された直流電圧をインバータ回路５に供給し
、インバータ回路５のサイリスクを負荷回路の共振周波
数に同期して制御することにより、所望電圧を有する高
周波電圧を出力する。このようなインバータ装置の変換
動作は公知のインパーク装置と同様である。A voltage-controlled DC voltage is supplied to the inverter circuit 5 by controlling the firing phases of W, Outputs a high frequency voltage. The conversion operation of such an inverter device is similar to that of a known impark device.
１０は整流装置２の出力電圧を制御する出力制御装置で
ある。１１は演算地幅器を用いた出力調節器であって、
出力設定器１２の設定値に応じた値の出力信号を点弧角
調整器１３に供給する。10 is an output control device that controls the output voltage of the rectifier 2. Reference numeral 11 is an output regulator using a calculation width regulator,
An output signal having a value corresponding to the set value of the output setter 12 is supplied to the firing angle adjuster 13.
出力調節器１１にはインバータの出力電圧制限用の電圧
リミッタ回路１４とインバータの出力電流制限用の電流
リミッタ回路１５とが接続されている。電圧リミッタ回
路１４はインバータ回路５の交流出力電圧を検出する計
器用変成器２０の出力電圧か供給される演算増幅器１４
ａと、リミッタ用のダイオード１４ｂと、制限電圧設定
器１４Ｃとを有し、インバータ回路５の出力電圧が制限
電圧設定器１４Ｃの設定値を越えると、演算増幅器１４
ａがオンとなり、ダイオード１４ｂがオンとなって、出
力調節器１１の出力電圧を所定の値にクランプして、イ
ンバータ回路５の出力電圧を所定の制限範囲内に抑制す
る。Connected to the output regulator 11 are a voltage limiter circuit 14 for limiting the output voltage of the inverter and a current limiter circuit 15 for limiting the output current of the inverter. The voltage limiter circuit 14 includes an operational amplifier 14 that is supplied with the output voltage of the instrument transformer 20 that detects the AC output voltage of the inverter circuit 5.
a, a limiter diode 14b, and a limit voltage setter 14C, and when the output voltage of the inverter circuit 5 exceeds the set value of the limit voltage setter 14C, the operational amplifier 14
a turns on, diode 14b turns on, clamps the output voltage of output regulator 11 to a predetermined value, and suppresses the output voltage of inverter circuit 5 within a predetermined limit range.
一方、電流リミッタ回路１５は、整流装置２への入力電
流を検出する変流器２１の出力電圧が供給される演算増
幅器１５ａと、リミッタ用のダイオード１５ｂと、制限
電流設定器１５Ｃとを有し、インバータ装置１への入力
電流が、制限電流設定器１５Ｃの設定値を越えると演算
増幅器１５ａはオンとなり、ダイオード１５ｂかオンと
なって、出力調節器１１の出力電圧を所定値にクランプ
して、結果的にインバータ装置１の出力電流を所定の制
限範囲内に抑制する。On the other hand, the current limiter circuit 15 includes an operational amplifier 15a to which the output voltage of the current transformer 21 that detects the input current to the rectifier 2 is supplied, a limiter diode 15b, and a limit current setter 15C. When the input current to the inverter device 1 exceeds the set value of the limit current setting device 15C, the operational amplifier 15a turns on, and the diode 15b also turns on, clamping the output voltage of the output regulator 11 to a predetermined value. As a result, the output current of the inverter device 1 is suppressed within a predetermined limit range.
点弧角調整器１３は出力調節器１１の出力電圧に応じた
位相のパルスを発生し、このパルスはパルス伝送回路２
２を介して、各ツ′イリスタＵ、 Ｖ。The firing angle regulator 13 generates a pulse whose phase corresponds to the output voltage of the output regulator 11, and this pulse is transmitted to the pulse transmission circuit 2.
2 through each twilister U, V.
ｗ、ｘ、ｙ、ｚのゲートに供給される。Supplied to the gates of w, x, y, and z.
３０はインバータ回路５のサイリスタを負荷回路の共振
周波数に同期して点弧制御する公知の制御回路であり、
点弧角調整器３１は所定の周期のパルスを発生して、パ
ルス伝送回路３２を介してサイリスクＡ、 Ｂ、
Ｃ，Ｄのゲートに点弧パルスを供給して、各サイリスク
を交互に点弧して、公知のインバータと同様にして所定
周波数の高周波の交流出力を発生する。30 is a known control circuit that controls firing of the thyristor of the inverter circuit 5 in synchronization with the resonant frequency of the load circuit;
The firing angle regulator 31 generates pulses with a predetermined period, and sends the pulses A, B, and
An ignition pulse is supplied to the gates of C and D to alternately ignite each sirisk to generate a high-frequency alternating current output at a predetermined frequency in the same manner as a known inverter.
なお４０は公知のインバータ起動回路、４１は起動指令
接点、４２１ｄ起動停止演算回路である。Note that 40 is a known inverter starting circuit, 41 is a starting command contact, and 421d is a starting/stopping calculation circuit.
上述の装置において、炉コイル６のインピーダンスが正
常であるときは、出力制御装置１０の出力調節器１１は
出力設定器１２の設定値に対応した電圧を点弧角調整器
１３に供給して、上記設定値に対応した点弧位相でサイ
リスクＵないしＺを制御し、整流装置２から出力設定器
１２の設定値に対応した直流電圧を生じ、結果的にイン
バータ回路５から所定出力を炉コイル６に供給する。In the above device, when the impedance of the furnace coil 6 is normal, the output regulator 11 of the output control device 10 supplies the firing angle regulator 13 with a voltage corresponding to the set value of the output setter 12, The cyrisks U to Z are controlled with the ignition phase corresponding to the above set value, a DC voltage corresponding to the set value of the output setting device 12 is generated from the rectifier 2, and as a result, a predetermined output is transmitted from the inverter circuit 5 to the furnace coil 6. supply to.
インバータ回路５の出力は出力設定器１２の設定値を変
更すると変化する。The output of the inverter circuit 5 changes when the set value of the output setter 12 is changed.
い寸、たとえば炉コイル６のインピーダンスが低くなり
、入力電流が異常に高くなると、変流器２１の出力も大
きくなり、その出力が制限電流設定器１５Ｃの設定値を
越えると、出力調整器１ ］。For example, when the impedance of the furnace coil 6 becomes low and the input current becomes abnormally high, the output of the current transformer 21 also becomes large, and when the output exceeds the setting value of the limiting current setting device 15C, the output regulator 1 ].
の出力電圧は制限電流設定器１５Ｃの設定値にクランプ
され、整流装置２の出力電圧も所定の値にクランプされ
る。その結果インバータ回路５の出力の増加は防止され
、炉コイル６に過負荷が印加されるのが防止される。The output voltage of the rectifier 2 is clamped to the set value of the limit current setting device 15C, and the output voltage of the rectifier 2 is also clamped to a predetermined value. As a result, an increase in the output of the inverter circuit 5 is prevented, and an overload is prevented from being applied to the furnace coil 6.
インバータ回路５の出力電圧か制限電圧設定器１４Ｃの
設定値よりも高くなった場合も調節器１１の出力は制限
され、インバータ回路５の異常電圧」二昇は防止される
。Even when the output voltage of the inverter circuit 5 becomes higher than the set value of the limit voltage setter 14C, the output of the regulator 11 is limited, and abnormal voltage rise of the inverter circuit 5 is prevented.
以上詳述したように、この発明のインバータはインバー
タ出力を設定範囲内に制限することによりインバータ出
力を安定化したものであって、負帰還系を用いないので
、負荷の変動によるハンチングの発生のおそれがなく、
したがって、系全体の調節が容易であるとともに、整流
装置とインバータ回路の同に設ける直流リアクトルを小
型化でき、全体を安価かつ小型に構成でき、負荷変動の
大ぺな誘導炉等の電源として好適である。As detailed above, the inverter of the present invention stabilizes the inverter output by limiting the inverter output within a set range, and does not use a negative feedback system, so hunting due to load fluctuations is prevented. There is no fear,
Therefore, it is easy to adjust the entire system, and the DC reactor installed in the rectifier and inverter circuit can be downsized, making the entire system inexpensive and compact, making it suitable as a power source for induction furnaces with large load fluctuations. It is.
図はこの発明の一実施例を示す回路図である。
パータ回路、６・・・炉コイル、１０・・・出力制御装
置、１１・・・出力調節器、１４・・・電圧リミッタ回
路、１５・・・電流リミッタ回路。
特許出願人 富士電機製造株式会社The figure is a circuit diagram showing one embodiment of the present invention. Parter circuit, 6... Furnace coil, 10... Output control device, 11... Output regulator, 14... Voltage limiter circuit, 15... Current limiter circuit. Patent applicant Fuji Electric Manufacturing Co., Ltd.
Claims (1)
その整流された直流をリアクトルを介してインバータに
供給して、所定周波数、所定電圧の交流出力を得るよう
にしたインバータ装置において、上記整流装置の点弧角
を制御する制御装置は、出力設定器と、出力設定器の設
定値に応じた値の出力信号を生じる出力調節器と、イン
バータ装置の電流が設定値を越えたとき、上記出力調節
器の出力信号をＥ定値にクランプする電流クランプ手段
と、インバータ装置の出力電圧か設定値を越えたとき上
記出力調節器の出力信号を一定値にクランプする電圧ク
ランプ手段と、出力調節器の出力信号に応じた点弧角を
有するパルスを出力する点弧角調整器とにより構成した
ことを特徴とするインバータ装置。(1) Rectifying commercial alternating current with a firing angle controlled rectifier,
In an inverter device that supplies the rectified DC to an inverter via a reactor to obtain an AC output of a predetermined frequency and a predetermined voltage, the control device that controls the firing angle of the rectifier is an output setting device. an output regulator that generates an output signal having a value corresponding to the set value of the output setter; and a current clamping means that clamps the output signal of the output regulator to the E constant value when the current of the inverter device exceeds the set value. and voltage clamping means for clamping the output signal of the output regulator to a constant value when the output voltage of the inverter device exceeds a set value, and outputting a pulse having a firing angle according to the output signal of the output regulator. An inverter device comprising: a firing angle adjuster.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57096802A JPS58215975A (en) | 1982-06-05 | 1982-06-05 | Inverter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57096802A JPS58215975A (en) | 1982-06-05 | 1982-06-05 | Inverter device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58215975A true JPS58215975A (en) | 1983-12-15 |
Family
ID=14174744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57096802A Pending JPS58215975A (en) | 1982-06-05 | 1982-06-05 | Inverter device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58215975A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61210407A (en) * | 1985-03-15 | 1986-09-18 | Ricoh Co Ltd | Abnormal detecting system for high voltage electric power source device |
-
1982
- 1982-06-05 JP JP57096802A patent/JPS58215975A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61210407A (en) * | 1985-03-15 | 1986-09-18 | Ricoh Co Ltd | Abnormal detecting system for high voltage electric power source device |
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