JPH0548073B2 - - Google Patents
Info
- Publication number
- JPH0548073B2 JPH0548073B2 JP57151184A JP15118482A JPH0548073B2 JP H0548073 B2 JPH0548073 B2 JP H0548073B2 JP 57151184 A JP57151184 A JP 57151184A JP 15118482 A JP15118482 A JP 15118482A JP H0548073 B2 JPH0548073 B2 JP H0548073B2
- Authority
- JP
- Japan
- Prior art keywords
- output
- converter
- current
- circuit
- conversion device
- 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
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
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/505—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/515—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
Description
【発明の詳細な説明】
この発明は電流型逆変換装置の保護装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a protection device for a current type inverter.
周知のように逆変換装置は電動機の制御や誘導
加熱等の近年多用されるようになつて来た。こ
の種、逆変換装置は順変換装置の出力を入力電源
として動作されるが、逆変換装置に下記のような
不具合が発生されるため、順変換装置も下記のよ
うに制御される。 As is well known, inversion devices have come into widespread use in recent years for applications such as controlling electric motors and induction heating. This type of inverse converter is operated using the output of the forward converter as an input power source, but since the following problems occur in the inverse converter, the forward converter is also controlled as follows.
すなわち、逆変換装置が転流失敗すると、順変
換電流が増加して逆変換装置を構成している素子
に大電流が流れ、素子を破壊させるおそれがあ
る。このため、順変換装置の出力を、前記転流失
敗が発生したときに減少あるいは停止させる手段
がとられる。この手段として、従来は転流失敗に
より電流が増加し、この電流が定格の120〜150％
ぐらいに達したときに、順変換装置の出力を減少
あるいは停止させるようにしている。この結果、
順変換装置の制御遅れがこれに加わつて素子には
定格の200〜300％ぐらいの電流が流れる。このた
め、予め素子に大電流に耐え得るものを使用しな
いと素子を破壊させてしまう。また、大電流に耐
え得る素子では素子自身の形状が大型化するとと
もに高価となつて、装置の大型かつ価格の高騰を
招く欠点も生じてくる。 That is, if the inverse converter fails to commutate, the forward conversion current increases and a large current flows through the elements constituting the inverter, potentially destroying the elements. For this reason, measures are taken to reduce or stop the output of the forward conversion device when the commutation failure occurs. Conventionally, as a means of this, the current increases due to commutation failure, and this current increases by 120 to 150% of the rated value.
When this point is reached, the output of the forward conversion device is reduced or stopped. As a result,
Adding to this the control delay of the forward converter, a current of about 200 to 300% of the rated current flows through the element. For this reason, unless a device that can withstand a large current is used in advance, the device will be destroyed. Furthermore, in the case of an element that can withstand a large current, the shape of the element itself becomes larger and the element becomes more expensive, resulting in a drawback that the device becomes larger and the price rises.
上記のような欠点を除去するために、転流失敗
を検出する回路を具備した装置が開発されたが、
この検出回路は、普通順変換装置の正負出力間の
電圧零レベルになつたことを検出して転流失敗を
判断するものである。このような判断を行なう装
置では始動時や低出力時に順変換装置の出力間が
零レベル（電流が断続するとき）になる期間が生
じる。このようなときに逆変換装置が転流失敗し
たと判断すると順変換器の出力を減少させたりあ
るいは停止させたりしまうおそれがある。また、
上記検出回路を備えた装置では始動時あるいは低
出力時に電流が断続した場合に動作が不安定とな
るおそれがある。 In order to eliminate the above-mentioned drawbacks, devices equipped with a circuit for detecting commutation failure have been developed.
This detection circuit normally detects that the voltage between the positive and negative outputs of the forward converter has reached zero level and determines commutation failure. In a device that makes such a determination, there is a period during which the output of the forward converter is at zero level (when the current is intermittent) during startup or when the output is low. In such a case, if the inverse converter determines that commutation has failed, there is a risk that the output of the forward converter will be reduced or stopped. Also,
In a device equipped with the above-mentioned detection circuit, there is a risk that the operation will become unstable if the current is interrupted during startup or low output.
この発明は上記の事情に鑑みてなされたもの
で、順変換装置の出力（直流電流）が一時的に断
続したとしても常に装置を安定に運転でき、かつ
転流失敗が発生した際にも順変換装置の出力を減
少あるいは停止させるために素子の保護が確実に
図かれる逆変換装置の保護装置を提供することを
目的とする。 This invention was made in view of the above circumstances, and allows the device to always operate stably even if the output (DC current) of the forward converter is temporarily interrupted, and even if a commutation failure occurs, the device can always operate stably. It is an object of the present invention to provide a protection device for an inverse converter, which can surely protect elements in order to reduce or stop the output of the converter.
以下図面を参照してこの発明の一実施例を説明
する。 An embodiment of the present invention will be described below with reference to the drawings.
第１図において、１はサイリスタ素子を用いた
順変換装置で、この装置１の正側は直流リアクト
ル２を介して逆変換装置３の入力の正側に接続さ
れる。また、順変換装置１の負側は逆変換装置３
の入力の負側に直接接続される。前記逆変換装置
３はブリツジ回路に形成された第１〜第４サイリ
スタ３ａ〜３ｄからなり、ブリツジ回路の中点間
に負荷４が接続される。５はダイオードブリツジ
からなる整流回路で形成された検出部で、この検
出部５は順変換装置の制御出力を検出するもので
あり、その入力の一端は限流抵抗６を介して逆変
換装置３の正側入力端に接続される。また、入力
の他端は逆変換装置３の負側入力端に接続され
る。検出部５の出力端には入出力が電気的に絶縁
された回路であるフオトカプラー７の発光側が接
続され、受光側の出力端はアンド回路８の一方の
入力端に接続される。フオトカプラー７の受光側
は電源に接続される。前記アンド回路８の他方の
入力端にはプラス比較器９の出力端が接続され
る。１０は順変換装置１の入力電源ラインに設け
られた変流器で、この変流器１０の出力はAC−
DC変換器１１を介して突き合せ回路１２に与え
られている。突き合せ回路１２には設定器１３を
介して所定の設定値が入力されている。１４は前
記比較器９の出力極性限定用ダイオードである。
前記アンド回路８の出力は順変換装置１の制御回
路１５に入力される。なお、図中、１６は還流ダ
イオード、１７は限流抵抗である。 In FIG. 1, reference numeral 1 denotes a forward conversion device using thyristor elements, and the positive side of this device 1 is connected to the positive side of the input of an inverse conversion device 3 via a DC reactor 2. Also, the negative side of the forward transformer 1 is the inverse transformer 3.
connected directly to the negative side of the input. The inverse conversion device 3 includes first to fourth thyristors 3a to 3d formed in a bridge circuit, and a load 4 is connected between the midpoints of the bridge circuit. Reference numeral 5 denotes a detection section formed by a rectifier circuit consisting of a diode bridge. This detection section 5 detects the control output of the forward conversion device, and one end of its input is connected to the inverse conversion device via a current limiting resistor 6. Connected to the positive input terminal of 3. Further, the other end of the input is connected to the negative input end of the inverse converter 3. The light emitting side of a photocoupler 7, which is a circuit whose input and output are electrically insulated, is connected to the output end of the detection unit 5, and the light receiving side output end is connected to one input end of an AND circuit 8. The light receiving side of the photocoupler 7 is connected to a power source. The output terminal of a plus comparator 9 is connected to the other input terminal of the AND circuit 8. 10 is a current transformer installed in the input power line of the forward converter 1, and the output of this current transformer 10 is AC-
It is applied to a matching circuit 12 via a DC converter 11. A predetermined setting value is input to the matching circuit 12 via a setting device 13. 14 is a diode for limiting the output polarity of the comparator 9.
The output of the AND circuit 8 is input to the control circuit 15 of the forward conversion device 1. In addition, in the figure, 16 is a free wheel diode, and 17 is a current limiting resistor.
次に上記実施例の動作を述べる。ここで、図示
しないゲート信号発生回路から逆変換装置３のサ
イリスタ３ａ，３ｄに点弧信号を与えて装置３を
始動させる。これにより負荷４には電流が供給さ
れ、その負荷４の両端電圧Vtは第２図ハのよう
になる。上記装置３の始動により、順変換装置１
の直流電圧Vdは第２図イのような波形になる。
これにより、逆変換装置３に直流電流Id（第２図
ロ）が供給されるが、時点T1のとき直流電圧Vd
の供給が断たれたとする。すると直流電流Idは第
２図ロのように徐々に低下して行き、時点T2で
零になる。そして時点T3で再び直流電圧Vdが逆
変換装置３に供給されるような、いわゆる順変換
装置１の断続動作時、（このような動作は特に始
動時あるいは低出力特発生する。）には順変換装
置１の交流入力側にも上記の影響が現われる。前
記直電圧Vdが零になるとき、変流器１０の出力
信号はAC−DC変換器１１で変換されて、第２図
ホに示すような波形となる。このAC−DC変換器
１１の出力信号は定格電流の120％〜150％程度の
レベルで設定された設定器１３の設定値（第２図
ヘに示すプラスＶ）と比較され、その信号が設定
値以下の時は零レベルに、設定値以上の時は
「１」レベルになつて比較器９の出力に現われる。
（第２図ト）なお、AC−DC変換器１１の出力信
号は変流器１０の出力が零になつても多少タイム
ラグを持つて零レベルになる。 Next, the operation of the above embodiment will be described. Here, a firing signal is applied to the thyristors 3a and 3d of the inverter 3 from a gate signal generation circuit (not shown) to start the device 3. As a result, current is supplied to the load 4, and the voltage V t across the load 4 becomes as shown in FIG. 2C. By starting the above device 3, the forward conversion device 1
The DC voltage Vd has a waveform as shown in Figure 2A.
As a result, a direct current I d (FIG. 2 b) is supplied to the inverter 3, but at time T 1 the direct current voltage V d
Suppose that the supply of Then, the DC current I d gradually decreases as shown in FIG. 2B, and reaches zero at time T 2 . Then, during the so-called intermittent operation of the forward converter 1, in which the DC voltage V d is again supplied to the inverter 3 at time T 3 (such operation occurs especially at startup or at low output). The above effect also appears on the AC input side of the forward converter 1. When the direct voltage V d becomes zero, the output signal of the current transformer 10 is converted by the AC-DC converter 11 and has a waveform as shown in FIG. 2E. The output signal of this AC-DC converter 11 is compared with the setting value of the setting device 13 (plus V shown in Fig. 2), which is set at a level of about 120% to 150% of the rated current, and the signal is When it is less than the set value, it becomes zero level, and when it is more than the set value, it becomes "1" level, which appears in the output of comparator 9.
(FIG. 2G) Note that even when the output of the current transformer 10 becomes zero, the output signal of the AC-DC converter 11 reaches the zero level with some time lag.
前記直流電流Idが零になると、第１図のVPN間
の電圧（第２図ニに示す）も零になる。このた
め、フオトカプラー７の出力側は第２図チのよう
になり、前記時点T2とT3期間のレベルは「１」
となる。この結果アンド回路８の出力は第２図リ
のようになつて出力レベルは零であり、制御回路
１５は停止することなく順変換装置１の運転を継
続させるゲート信号を送出する。 When the DC current I d becomes zero, the voltage across V PN in FIG. 1 (shown in FIG. 2 D) also becomes zero. Therefore, the output side of the photocoupler 7 becomes as shown in Figure 2 H, and the level at the time T 2 and T 3 is "1".
becomes. As a result, the output of the AND circuit 8 becomes as shown in FIG. 2, and the output level is zero, and the control circuit 15 sends out a gate signal that causes the forward conversion device 1 to continue operating without stopping.
次に低出力時の前記第２図に示した時点T2と
T3期間内で転流失敗が発生した場合、第３図ロ
に示すような電流（）が流れる。このため、
AC−DC変換器１１の出力にも信号ｄが現われる
ので、この出力ｄが設定値以上になつたとき、比
較器９の出力には第３図トに示す信号(c)が現われ
る。この結果、フオト・カプラ７よりのチ信号と
前記ト信号とでアンド回路８の出力は「１」にな
り、制御回路１５から順変換装置１を停止させる
ゲート信号が送出され、第３図のT0期間装置１
は停止される。 Next, at time T 2 shown in the above figure 2 at low output
If a commutation failure occurs within the T3 period, a current ( ) as shown in Figure 3B flows. For this reason,
Since the signal d also appears at the output of the AC-DC converter 11, when this output d exceeds the set value, the signal (c) shown in FIG. 3G appears at the output of the comparator 9. As a result, the output of the AND circuit 8 becomes "1" due to the Q signal from the photo coupler 7 and the G signal, and a gate signal is sent from the control circuit 15 to stop the forward conversion device 1, as shown in FIG. T 0 period device 1
will be stopped.
また、負荷４への電力供給が比較的多量である
いわゆる中・高出力時に転流失敗が発生した場合
には第４図イ〜チに示すように各回路は動作して
前記第３図の動作同様にT0期間装置１は停止さ
れる。 In addition, if a commutation failure occurs during so-called medium/high output when the power supply to the load 4 is relatively large, each circuit operates as shown in Fig. 4 (1) to (1). Similarly to the operation, the device 1 is stopped during the T 0 period.
上述のように中・高出力時には転流失敗を確実
に検出して装置１の停止を図ることができるの
で、サイリスタ素子の保護は確実に確保できる。 As described above, at medium and high outputs, commutation failure can be reliably detected and the device 1 can be stopped, so the protection of the thyristor elements can be ensured.
以上述べたように、この発明によれば、低出力
時あるいは始動時に順変換装置の直流電流が断続
された場合、転流失敗かどうかを交流入力電流の
値によつて判断するようにしたので、低出力時や
始動時に順変換装置の運転を停止させることがな
く運転を継続でき、しかも転流失敗時には確実に
これを検出して装置の運転を停止させることがで
きる等の利点がある。 As described above, according to the present invention, when the DC current of the forward converter is interrupted during low output or startup, it is determined whether commutation has failed based on the value of the AC input current. This method has advantages such as being able to continue operation without stopping the forward conversion device during low output or startup, and also being able to reliably detect commutation failure and stop the operation of the device.
第１図はこの発明の一実施例を示す回路図、第
２図イから第２図リは上記実施例の動作説明図、
第３図イから第３図チおよび第４図イから第４図
チは転流失敗時の動作説明図である。
１……順変換装置、３……逆変換装置、４……
負荷、５……検出部、７……フオトカプラー、８
……アンド回路、９……比較器、１０……変流
器、１１……AC−DC変換器、１２……突き合せ
回路、１３……設定器、１５……制御回路。
FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIGS. 2A to 2R are operation explanatory diagrams of the above embodiment,
FIGS. 3A to 3H and FIGS. 4A to 4C are explanatory diagrams of operations when commutation fails. 1... Forward conversion device, 3... Inverse conversion device, 4...
Load, 5...Detection unit, 7...Photocoupler, 8
... AND circuit, 9 ... Comparator, 10 ... Current transformer, 11 ... AC-DC converter, 12 ... Matching circuit, 13 ... Setting device, 15 ... Control circuit.
Claims (1)
この直流電力を直流中間回路を介して逆変換装置
で交流電力に変換する電流型インバータで、前記
直流中間回路の正極、負極間の電圧零レベルを検
出する検出部の出力信号で逆変換装置の転流失敗
を判断する保護装置において、前記順変換装置の
入力電流を検出する変換器と、この変換器の出力
信号と、前記順変換装置の入力電流値の上限値を
設定する設定器の出力信号とをつき合わせて比較
する比較器と、この比較器の出力信号と前記直流
中間回路の零電圧検出信号との論理積を得て出力
する論理積回路と、この論理積出力信号で前記順
変換装置の出力を停止する順変換装置の制御装置
とで構成したことを特徴とする逆変換装置の保護
装置。1 Convert AC power to DC power with a forward converter,
This DC power is converted into AC power by an inverter via a DC intermediate circuit in a current type inverter. A protection device for determining commutation failure includes a converter that detects the input current of the forward converter, an output signal of this converter, and an output of a setting device that sets an upper limit value of the input current value of the forward converter. a comparator that compares the signals, an AND circuit that obtains an AND of the output signal of the comparator and the zero voltage detection signal of the DC intermediate circuit, and outputs the AND, 1. A protection device for an inverse conversion device, comprising a control device for a forward conversion device that stops output of the conversion device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15118482A JPS5941180A (en) | 1982-08-31 | 1982-08-31 | Protecting device for power inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15118482A JPS5941180A (en) | 1982-08-31 | 1982-08-31 | Protecting device for power inverter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5941180A JPS5941180A (en) | 1984-03-07 |
| JPH0548073B2 true JPH0548073B2 (en) | 1993-07-20 |
Family
ID=15513115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15118482A Granted JPS5941180A (en) | 1982-08-31 | 1982-08-31 | Protecting device for power inverter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5941180A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0626036Y2 (en) * | 1988-05-16 | 1994-07-06 | 日新電機株式会社 | Inverter protector |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56129579A (en) * | 1980-03-11 | 1981-10-09 | Fuji Electric Co Ltd | Protecting circuit of current type inverter |
-
1982
- 1982-08-31 JP JP15118482A patent/JPS5941180A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5941180A (en) | 1984-03-07 |
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