JPS6231373A - Constant-current control circuit of thyristor bridge - Google Patents
Constant-current control circuit of thyristor bridgeInfo
- Publication number
- JPS6231373A JPS6231373A JP16896085A JP16896085A JPS6231373A JP S6231373 A JPS6231373 A JP S6231373A JP 16896085 A JP16896085 A JP 16896085A JP 16896085 A JP16896085 A JP 16896085A JP S6231373 A JPS6231373 A JP S6231373A
- Authority
- JP
- Japan
- Prior art keywords
- bridge
- control circuit
- output
- output current
- load
- 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.)
- Granted
Links
Landscapes
- Rectifiers (AREA)
- Control Of Voltage And Current In General (AREA)
- Control Of Electrical Variables (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、たとえば電熱器負荷に供給する交流電力を調
整するために用いられるサイリスタブリッジに係り、特
忙負荷変動とか電源変動に対してもサイリスタブリッジ
の出力電流の変動を抑制して一定忙制御するための定電
流制御回路に関する。Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a thyristor bridge used, for example, to adjust AC power supplied to an electric heater load. The present invention relates to a constant current control circuit for suppressing fluctuations in the output current of a bridge to perform constant busy control.
単相あるいは三相の交流電力の調整を行なうために、サ
イリスタ、たとえばＳＣＲ （米国ＧＥ社商品名）を用
いたブリツノの各ＳＣＲの流通角（位相）を制御する場
合、従来は友とえば第５ ′図に示すように構成さ
れている。即ち、１は三相電源、２は三相用のＳＣＲブ
リッジ、３は負荷 □（たとえばヒータ）、４は上
記ＳＣＲブリッジ２ ｛の出力電流を一定の設定値
に維持するように各 ＪＳＣＨの流通角ｔ−副制御
るために所定のタイミン １グで各ＳＣＲにダート
側副・母ルス傷号を供給するためのブリッジ制御回路で
ある。このプリッジ制御回路４は、前記三相電源Ｊの出
力に基いて同期・！ルス信号を発生する同期・ンルス発
生回路５と、上記同期・ぞルス信号を位相基準とし・帰
還回路６からの信号に基いてＳＣＲ流通角を決定する位
相制御回路７と、この位相制御回路７の出力信号に基い
て５ＣＲｒ−１制（財）・ぐルスを発生してＳＣＲに供
給するＩｆ −ト／臂ルス発生回路８とを有する。上記
帰還回路６は、 ＳＣＲブリッジ２の出力電流に比例
した帰還信号が入力し、この出力電流が一定となるよ５
に前記位相制御回路４ ｅ ！ＩＪ ａするものである
。そして、従来はＳＣＲブリッジ２の出力電流を検出す
るために、 ＳＣＲブリツノ２の入力側に変ｂ１を器
（カレント・トランス）９を設け、この変流器９の出力
を帰還回路６内で検波ダイオードにより検波している。In order to adjust single-phase or three-phase AC power, when controlling the flow angle (phase) of each SCR of a thyristor, such as an SCR (trade name of GE Corporation in the United States), conventionally It is constructed as shown in Figure 5'. In other words, 1 is a three-phase power supply, 2 is a three-phase SCR bridge, 3 is a load (for example, a heater), and 4 is the above-mentioned SCR bridge 2. This is a bridge control circuit for supplying dirt collateral and main pulse flaw signals to each SCR at a predetermined timing for angle t-sub control. This bridge control circuit 4 is synchronized based on the output of the three-phase power supply J. a synchronization/nullus generation circuit 5 that generates a pulse signal; a phase control circuit 7 that uses the synchronization/nursus signal as a phase reference and determines the SCR flow angle based on a signal from the feedback circuit 6; It has an If-to/arm pulse generating circuit 8 which generates a 5CRr-1 pulse based on the output signal of the SCR and supplies it to the SCR. The feedback circuit 6 receives a feedback signal proportional to the output current of the SCR bridge 2, and operates so that the output current remains constant.
The phase control circuit 4 e! IJ a. Conventionally, in order to detect the output current of the SCR bridge 2, a current transformer (current transformer) 9 is provided on the input side of the SCR bridge 2, and the output of this current transformer 9 is detected within the feedback circuit 6. Detected by a diode.
ところで、ＳＣＲブリッジ２の出力電流を一定とするよ
うに正確にｆｌｆｉＪ御するため釦は、定格出力電流の
全範囲にわたって出力電流に正確に比例した帰還信号が
必要である。然るに、前述したようにＳＣＲブリッジ２
の入力側に変流器９を設けて出力電流を検出することは
、（１）変流器９の出力特性の非直線性、（２）帰還回
路６内で変流器９の出力を検波するた峠に用いられる検
波ダイオードの検波特性の非直線性によって、定格出力
電流の全範囲にわたって出力１１１ｔ流に正確に比例し
た帰還信号を得ることが困難であっ九。By the way, in order to accurately control flfiJ so that the output current of the SCR bridge 2 is constant, the button requires a feedback signal that is accurately proportional to the output current over the entire range of the rated output current. However, as mentioned above, SCR bridge 2
Detecting the output current by installing the current transformer 9 on the input side of the current transformer 9 eliminates (1) non-linearity of the output characteristics of the current transformer 9, and (2) detecting the output of the current transformer 9 within the feedback circuit 6. Due to the non-linearity of the detection characteristics of the detection diode used in the Shiruta Pass, it is difficult to obtain a feedback signal that is accurately proportional to the output 111t current over the entire range of rated output current.
本発明は上記の事情に鑑みてなされたもので・サイリス
タブリッジの定格出力ｍ流の全範囲にわたって出力電流
に正確に比例した帰還信号が得られ、上記出力電流の正
確な定電流制御を行ない得るサイリスタブリッジの定電
流制御回路を提供するものである。The present invention has been made in view of the above circumstances, and it is possible to obtain a feedback signal that is accurately proportional to the output current over the entire range of the rated output m current of the thyristor bridge, and to perform accurate constant current control of the output current. The present invention provides a constant current control circuit for a thyristor bridge.
即ち、本発明のサイリスタブリッジの定電流制御回路は
、サイリスタブリッジの負荷に直列に出力電流検出用抵
抗を挿入し、この抵抗の両端電圧を直線性の良い入出力
特性を有するフォトカプラに入力し、このフォトカプラ
の出力をブリッジ制御回路へ帰還制御信号として与える
ようにしてなることを特徴とするものである。That is, the constant current control circuit of the thyristor bridge of the present invention inserts an output current detection resistor in series with the load of the thyristor bridge, and inputs the voltage across this resistor to a photocoupler having input/output characteristics with good linearity. , the output of this photocoupler is given to the bridge control circuit as a feedback control signal.
これによって、出力電流検出用抵抗の両端にはブリッジ
出力電流に正確に比例した電圧降下が生じ、７オトカグ
ラから上記出力電流に正確に比例した帰還制御信号が得
られるので、ブリッジ制御回路により高精度の定電流ｉ
１Ｊ ＃が行なわれるようになる。As a result, a voltage drop that is exactly proportional to the bridge output current is generated across the output current detection resistor, and a feedback control signal that is exactly proportional to the output current is obtained from the 7 Otokagura, so the bridge control circuit provides high precision. constant current i
1J# will now be performed.
以下、図面を参照し°Ｃ本発明の一実施例を詳細に説明
する。Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
第１図に示すサイリスタブリッジの定電流制御回路は、
第５図を参照して前述した定１）５． ａ ｆ［ｔｌＪ
御回路に比べて、変流器９および帰還回路６′内の検波
ダイオードを省略し、負荷３に直列に出力電流検出用の
抵抗１１を挿入し、この抵抗１）の両端電圧を入力とし
てこれに比例した出力信号を発生すると共に入出力端間
が電気的に絶縁されたフォトカプラ１２を使用し、この
フォトカプラ１２の出力信号全帰還信号として帰還回路
６′に入力するようにした点が異なり、その他は同じで
あるので、第５図中と同一部分には同一符号を付してそ
の説明を省略する。The constant current control circuit of the thyristor bridge shown in Figure 1 is as follows:
1)5. a f[tlJ
Compared to the control circuit, the current transformer 9 and the detection diode in the feedback circuit 6' are omitted, a resistor 11 for output current detection is inserted in series with the load 3, and the voltage across this resistor 1) is input. The point is that a photocoupler 12 which generates an output signal proportional to However, since the other parts are the same, the same parts as in FIG.
上記フォトカプラ１２としては、人出力特性に直線性を
持たせたものであればよく、たとえば差動型フォトカプ
ラが使用される。即ち、差動型フォトカプラ自体は公知
であり、たとえば第２図に示すように入力信号を増幅す
る入力増幅器２０の出力電流を第１のフォトカプラ２ノ
の入力側（発光ダイオード）に流し、第１の７オトカプ
２２１の受光トランジスタと第２の７オトカプラ２２の
受光トランジスタとの各一端を共通接続して所定電位端
に接続し、上記２個の受光トランジスタの各他端を差動
増幅器２３の差動入力端に接続し、この差動増幅器２３
の出力電流を第２の７オトカメラ２２０発光ダイオード
Ｉｃ流し、この発光ダイオードの電流忙応じた出力信号
を出力増幅器・２４から出力するものである。この場合
、差動増幅器、２３の差動入力端が同電位になるように
動作し、２組の７オトカプラ２１１２２それぞれの発光
ダイオード電流が等しくなり、入出力特性が直線性を有
する。つまり、２組のフォトカプラ２１．２２それぞれ
の入出力特性が非直線性を有していてもこれらが差動的
に接続されることによってそれぞれの入出力特性が相補
的九合成されるよ５になり、たとえばθ〜８２２＋’Ｖ
の入力電圧範囲に対して出力電圧が１．５〜ＯＶの範囲
で変化する直線性の良い入出力特性が待ら八る。なお、
２５゜２６は前記７オトカグラ２１．２２の各発光ダイ
オードにバイアス用の定電流を流すことによって動作領
域を拡げるための定電流源である。The photocoupler 12 may be any photocoupler that has linearity in human output characteristics; for example, a differential photocoupler may be used. That is, the differential photocoupler itself is well known, and for example, as shown in FIG. 2, the output current of an input amplifier 20 that amplifies the input signal is passed to the input side (light emitting diode) of the first photocoupler 2, One end of each of the light-receiving transistor of the first 7-oto coupler 221 and the light-receiving transistor of the second 7-oto coupler 22 is commonly connected and connected to a predetermined potential end, and the other ends of the two light-receiving transistors are connected to the differential amplifier 23. This differential amplifier 23
The output current is passed through the light emitting diode Ic of the second camera 220, and an output signal corresponding to the current of the light emitting diode is output from the output amplifier 24. In this case, the differential input terminals of the differential amplifier 23 operate to have the same potential, the light emitting diode currents of the two sets of 7 Otocouplers 21122 become equal, and the input/output characteristics have linearity. In other words, even if the input/output characteristics of the two sets of photocouplers 21 and 22 have nonlinearity, by differentially connecting them, the input/output characteristics of each pair will be synthesized in a complementary manner. For example, θ~822+'V
It is desirable to have input/output characteristics with good linearity in which the output voltage changes within a range of 1.5 to OV for an input voltage range of . In addition,
Reference numerals 25 and 26 denote constant current sources for expanding the operating range by passing a constant current for bias through each of the light emitting diodes of the seven Otokagura 21 and 22.
上記構成釦よるＳＣＲブリッジの定電流制御回路におい
ては、出力電流検出用抵抗１１の両端にはブリッジ出力
電流の定格ｉｔ流全全範囲わたって出力電流に正確に比
例した電圧降下が生じ、差動型フォトカプラ１２はその
入力電圧の全変化範囲にわたって正確に比例した出力電
圧（＃還信号）ｔ−発生するので、ブリッジ制御回路４
により高精度の定電流制御が行なわれる。この場合、１
００％の負荷変動を急激忙生じさせたときのブリッジ出
力電圧、出力電流の観測波形を第３図（負荷３の抵抗値
を１０００から２００、 Ωに急変させた場合）および
第４図（負荷３の抵抗値ｔ−２００Ωから１００Ωに急
変させた場合）Ｋ示している。これらの波形から分るよ
うに、出力［流値はほぼ一定であり、出力電圧（脈流波
形）の平均値が負荷抵抗値に応じて変化することによっ
て負荷電力が変化している。In the constant current control circuit of the SCR bridge using the above configuration button, a voltage drop occurs across the output current detection resistor 11 that is exactly proportional to the output current over the entire range of the rated current of the bridge output current, and the differential Since the type photocoupler 12 generates an output voltage (# return signal) t- that is accurately proportional over the entire range of change of its input voltage, the bridge control circuit 4
This allows highly accurate constant current control. In this case, 1
The observed waveforms of the bridge output voltage and output current when a 00% load change occurs suddenly are shown in Figure 3 (when the resistance value of load 3 is suddenly changed from 1000 to 200 Ω) and Figure 4 (load change). When the resistance value of t-3 is suddenly changed from 200Ω to 100Ω) K is shown. As can be seen from these waveforms, the output [current value] is almost constant, and the load power changes as the average value of the output voltage (pulsating current waveform) changes depending on the load resistance value.
上述したように本発明のサイリスタブリッツの定［流！
ＩＩ ｍ回路によれば、サイリスタブリツノの定格出力
電流の全範囲にわたって高精度の定電流制御が可能にな
り、ティリスタブリッジの出力電流が電源変動、負荷変
動により変動することを抑制することができる。As mentioned above, the constant flow of the thyristor blitz of the present invention!
According to the II m circuit, highly accurate constant current control is possible over the entire range of the rated output current of the thyristor bridge, and it is possible to suppress fluctuations in the output current of the thyristor bridge due to power supply fluctuations and load fluctuations. can.
第１図は本発明の一実施例に係るＳＣＲブリッジの定電
流制御回路を示す構成説明図、第２図は第１図中の差動
型フォトカプラの一例を示す回路図、第３図および第４
図は第１図における負荷変動時の動作を示す波形図、第
５図は従来のＳＣＲブリッジの定電流制御回路を示す構
成説明図である。
２・・・ＳＣＲ７”リッジ、３・・・負荷、４・・・ブ
リツノ制御回路、１１・・・出力電流検出用抵抗、１２
・・・差動型フォトカプラ。
出願人代理人 弁理士 鈴 江 武 彦第２図FIG. 1 is a configuration explanatory diagram showing a constant current control circuit of an SCR bridge according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing an example of a differential photocoupler in FIG. 1, and FIG. Fourth
FIG. 5 is a waveform diagram showing the operation during load fluctuation in FIG. 1, and FIG. 5 is a configuration explanatory diagram showing a constant current control circuit of a conventional SCR bridge. 2... SCR7" ridge, 3... Load, 4... Blitz control circuit, 11... Resistor for output current detection, 12
...Differential photocoupler. Applicant's agent Patent attorney Takehiko Suzue Figure 2
Claims (2)
電力を調整するためのサイリスタブリッジの出力電流を
検出し、この出力電流が一定となるように前記流通角を
制御するブリッジ制御回路を備えたサイリスタブリッジ
の定電流制御回路において、前記負荷に直列に出力電流
検出用抵抗を挿入し、この抵抗の両端電圧を直線性の良
い入出力特性を有するフォトカプラに入力し、このフォ
トカプラの出力を前記ブリッジ制御回路へ帰還制御信号
として与えるようにしてなることを特徴とするサイリス
タブリッジの定電流制御回路。(1) A bridge control circuit that detects the output current of a thyristor bridge to adjust the power supplied to the load by controlling the flow angle of AC power input, and controls the flow angle so that this output current is constant. In a constant current control circuit for a thyristor bridge equipped with a thyristor bridge, an output current detection resistor is inserted in series with the load, and the voltage across this resistor is input to a photocoupler having input/output characteristics with good linearity. A constant current control circuit for a thyristor bridge, characterized in that the output of the thyristor bridge is supplied as a feedback control signal to the bridge control circuit.
接続してなる差動型フォトカプラであることを特徴とす
る前記特許請求の範囲第１項記載のサイリスタブリッジ
の定電流制御回路。(2) The constant current control circuit for a thyristor bridge according to claim 1, wherein the photocoupler is a differential photocoupler formed by differentially connecting two sets of photocouplers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60168960A JPH0693215B2 (en) | 1985-07-31 | 1985-07-31 | Constant current control circuit of thyrista bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60168960A JPH0693215B2 (en) | 1985-07-31 | 1985-07-31 | Constant current control circuit of thyrista bridge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6231373A true JPS6231373A (en) | 1987-02-10 |
| JPH0693215B2 JPH0693215B2 (en) | 1994-11-16 |
Family
ID=15877746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60168960A Expired - Fee Related JPH0693215B2 (en) | 1985-07-31 | 1985-07-31 | Constant current control circuit of thyrista bridge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0693215B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5251549A (en) * | 1975-10-22 | 1977-04-25 | Meidensha Electric Mfg Co Ltd | Over voltage and over current suppression equipment for inverter |
| JPS54161045A (en) * | 1978-06-09 | 1979-12-20 | Toshiba Corp | Control system for control rectifier device |
-
1985
- 1985-07-31 JP JP60168960A patent/JPH0693215B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5251549A (en) * | 1975-10-22 | 1977-04-25 | Meidensha Electric Mfg Co Ltd | Over voltage and over current suppression equipment for inverter |
| JPS54161045A (en) * | 1978-06-09 | 1979-12-20 | Toshiba Corp | Control system for control rectifier device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0693215B2 (en) | 1994-11-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |