JPS61150672A - Control circuit of inverter - Google Patents
Control circuit of inverterInfo
- Publication number
- JPS61150672A JPS61150672A JP59278172A JP27817284A JPS61150672A JP S61150672 A JPS61150672 A JP S61150672A JP 59278172 A JP59278172 A JP 59278172A JP 27817284 A JP27817284 A JP 27817284A JP S61150672 A JPS61150672 A JP S61150672A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- resistor
- charging
- inverter
- operation command
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、直流電力を交流電力に変換するインバータの
制御回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control circuit for an inverter that converts DC power into AC power.
従来、この種のインバータにおいては、直流中間回路の
平滑用コンデンサが充電していない状態で電源側開閉器
を閉路すると、整流器を介して非常に大きなラッシュ電
流が平滑用コンデンサに流れ込み、このラッシュ電流に
工り整流器の素子群が永久破壊すると云う重大事故に至
る。Conventionally, in this type of inverter, when the power supply side switch is closed while the smoothing capacitor in the DC intermediate circuit is not charging, a very large rush current flows into the smoothing capacitor via the rectifier, and this rush current This leads to a serious accident in which the elements of the rectifier are permanently destroyed.
そこで、第２図に示すように順変換器ｌの出力側に設け
た直流電圧平滑用のコンデンサ２の出力電圧（直流電圧
）を抵抗器３．４で分圧したうえ、この分圧電圧と抵抗
器５．６とで作られる基準電圧ＶＢとを比較器７で比較
し、分圧電圧が基準電圧ＶＲよりも大きくなったならば
アンプ８を介してトランジスタ９を駆動し、ＳＣＲ点弧
回路１０を作動させ、コンデンサ２の充電用抵抗器１１
を５ＣＲ１２に工って短絡し、順変換器ｌの出力電圧が
電力損失の無い状態でインバータ１３に供給されるよう
にし、この状態で図示しない運転指令スイッチをオンし
、インバータ１３にコンデンサ２の出力電圧を印加し、
インバータ１３で所定周波数の交流電力に変換させる工
うにしたものがある。Therefore, as shown in Fig. 2, the output voltage (DC voltage) of the DC voltage smoothing capacitor 2 provided on the output side of the forward converter l is divided by a resistor 3.4, and this divided voltage and The comparator 7 compares the reference voltage VB produced by the resistor 5.6, and if the divided voltage becomes larger than the reference voltage VR, the transistor 9 is driven via the amplifier 8, and the SCR ignition circuit is activated. 10 is activated, and the charging resistor 11 of the capacitor 2 is activated.
5CR12 and short-circuit it so that the output voltage of the forward converter 1 is supplied to the inverter 13 without power loss. In this state, the operation command switch (not shown) is turned on, and the capacitor 2 is connected to the inverter 13. Apply the output voltage,
There is one in which an inverter 13 is used to convert the power into alternating current power at a predetermined frequency.
なお、整流器１４は比較器７などの制御回路部分の動作
用の低電圧電源を発生させるためのものであり、ここで
変換された直流電圧は電圧レギレータ１５で安定化され
て比較器７などの回路部分に供給される。Note that the rectifier 14 is for generating a low voltage power supply for operating the control circuit parts such as the comparator 7, and the DC voltage converted here is stabilized by the voltage regulator 15 and used for the comparator 7 etc. Supplied to the circuit section.
ところが、第２図の構成においては運転指令スイッチの
オン条件が回路的に何等規制されていないため、運転指
令スイッチをオン状態のままで電源スィッチ１６をオン
操作すると、これと同時にインバータ１３は運転状態と
なり、コンデンサ２は所定電圧まで充電されなくなる。However, in the configuration shown in FIG. 2, the ON conditions for the operation command switch are not regulated in any way by the circuit, so if the power switch 16 is turned on while the operation command switch is in the ON state, the inverter 13 is turned on at the same time. state, and the capacitor 2 is no longer charged to the predetermined voltage.
このため、コンデンサ２の充電電圧も確立しないので５
ＣＲ１２もオン状態とならず、インバータ１３には充電
用抵抗器１１を介して直流電力が連続的に供給されるよ
うになる。この結果、短時間定格の充電用抵抗器１１が
焼損してしまうという問題が生じていた。For this reason, the charging voltage of capacitor 2 is not established either, so 5
CR12 is also not turned on, and DC power is continuously supplied to inverter 13 via charging resistor 11. As a result, a problem occurred in that the short-time rated charging resistor 11 was burned out.
本発明は上記のＬうな問題点を解決するもので、充電用
抵抗器の焼損を防止するために、平滑用コンデンサの充
電電圧が所定値に達した段階で作動するスイッチング素
子を設け、このスイッチング素子の導通ζ：よって充電
用抵抗器を短絡すると共に、インバータに与える運転条
件の内に平滑用コンデンサの高圧確立のインタロックを
とる工うに構成したものである。The present invention solves the above-mentioned problems.In order to prevent the charging resistor from burning out, the present invention provides a switching element that is activated when the charging voltage of the smoothing capacitor reaches a predetermined value. Conduction of element ζ: Therefore, the charging resistor is short-circuited, and an interlock is provided to establish the high voltage of the smoothing capacitor within the operating conditions given to the inverter.
平滑用コンデンサの充電電圧が所定値に達するまでの間
は、運転指令はインタロックされるため、運転指令スイ
ッチをオン状態（二したままであっても電源投入によっ
て直ちにインバータが運転状態になることはなくなシ、
充電用抵抗器の焼損は防止される。The operation command is interlocked until the charging voltage of the smoothing capacitor reaches a predetermined value, so even if the operation command switch is left on, the inverter will not immediately go into operation when the power is turned on. It's gone,
Burnout of the charging resistor is prevented.
以下、本発明を図示する実施例に基づいて詳細に説明す
る。 ”
第１図は本発明の一実施例を示す回路図であり、第２図
と同一部分は同一記号で表わしている。なお、Ｉ！１図
ではリレーを用いた場合について述べるけれどもリレー
接点をスイッチング素子に代えてもよい。ｌＥｉ図にお
いて充電用抵抗器１１の両端にはリレー８８Ｆの常開接
点８８Ｐ＆が接続されている。リレー８８Ｐｔｆ順変換
器五の入力側電圧を利用し、リレーＲＹが作動し、その
常開接点ＲＹａが閉成すると動作して自己ホールドする
もので、その常開接点８８Ｐａは充電用抵抗器１１の両
端に接続され、また常閉接点８８Ｐｂは平滑用コンデン
サ２に並列接続された放電用抵抗器１７を開放するよう
に接続されている。このリレー８８Ｐを動作させるリレ
ーＲＹは、平滑用コンデンサ２の充電電圧が抵抗器５．
６で定められた基準電圧ｖＲを越えたとき比較器７の出
力信号に工ってトランジスタ１８がオンされることにエ
リ動作するように構成されている。そして、その常開接
点ＲＹａＨ１７レー８８Ｐの動作条件となると共に、ま
た常閉接点ＲＹｂＨ異常検出信号ＡＬＭと共に運転指令
信号のインタロック条件として運転シーケンス回路１９
のアントゲ−）２０に入力されている。Hereinafter, the present invention will be described in detail based on illustrated embodiments. ” Figure 1 is a circuit diagram showing one embodiment of the present invention, and the same parts as in Figure 2 are represented by the same symbols.Although Figure I!1 describes the case where a relay is used, relay contacts are used. It may be replaced with a switching element.In the lEi diagram, the normally open contacts 88P& of the relay 88F are connected to both ends of the charging resistor 11.Using the input side voltage of the relay 88Ptf forward converter 5, the relay RY is connected to both ends of the charging resistor 11. When the normally open contact RYa is closed, the normally open contact 88Pa is connected to both ends of the charging resistor 11, and the normally closed contact 88Pb is connected in parallel to the smoothing capacitor 2. It is connected to open the connected discharging resistor 17.The relay RY that operates this relay 88P is connected so that the charging voltage of the smoothing capacitor 2 is connected to the resistor 5.
When the voltage exceeds the reference voltage vR determined by 6, the output signal of the comparator 7 is manipulated so that the transistor 18 is turned on. The operation sequence circuit 19 serves as an operating condition for the normally open contact RYaH17 relay 88P, and also as an interlock condition for the operation command signal together with the normally closed contact RYbH abnormality detection signal ALM.
(Anto-game) 20.
ここで、運転指令としては、インバータ１３に誘導電動
機２１が接続されているために正転指令、逆転指令、零
連指令が運転シーケンス回路１９に入力され、これらの
論理和信号がアンドゲート２０に入力され、異常検出信
号ＡＬＭまたはリレーＲＹに１ってインタロックが解除
されたときのみ、インバータ１３の運転指令信号として
出力されるように構成されている。Here, as operation commands, since the induction motor 21 is connected to the inverter 13, a forward rotation command, a reverse rotation command, and a zero run command are input to the operation sequence circuit 19, and the logical sum signal of these is input to the AND gate 20. It is configured such that it is input as an operation command signal for the inverter 13 only when the interlock is released by the abnormality detection signal ALM or the relay RY.
従って、この工うな構成においては平滑用コンデンサ２
の充電電圧が所定電圧に達するまではリレーＲＹが動作
せず、アントゲ−）２０の入力信号は″Ｌ”レベルとな
り、運転指令は出力されない。Therefore, in this unconventional configuration, the smoothing capacitor 2
Until the charging voltage reaches a predetermined voltage, the relay RY does not operate, the input signal of the controller 20 becomes "L" level, and no operation command is output.
しかし、所定電圧に達すると、アントゲ−）２０の入力
信号が″Ｈ”レベルとなり、運転指令信号にアンドゲー
ト２０を通過し、インバータ１３に与えられる。However, when the predetermined voltage is reached, the input signal of the AND gate 20 becomes "H" level, passes through the AND gate 20 as an operation command signal, and is applied to the inverter 13.
この時、リレー８８Ｐも動作し、充電用抵抗器１１の両
端はその接点８８ Ｐ ａ ４：工って短絡されると共
に、コンデンサ２の両端に接続された抵抗器１７は接点
８８Ｐｂによって開放される。At this time, the relay 88P also operates, and both ends of the charging resistor 11 are short-circuited by the contact 88Pb, and the resistor 17 connected to both ends of the capacitor 2 is opened by the contact 88Pb. .
これによって、インバータ１３が逆変換動作な開始する
。この時、抵抗器１１の両端が接点３９Ｐａに１って短
絡されるため、電、力損失が抑制されると共に、充電時
間の短縮が図られる。This causes the inverter 13 to start a reverse conversion operation. At this time, both ends of the resistor 11 are short-circuited to the contact point 39Pa, so that power loss is suppressed and the charging time is shortened.
このように本実施例においては、平滑用コンデンサ２の
充電電圧が所定値に達するまでの間は運転指令信号はイ
ンタロックされるため、運転指令スイッチをオン状態と
したままであっても電源投入によって直ちにインバータ
１３が運転状態になることはなくなり、充電用抵抗器１
１の焼損は防止される。なお、上記実施例中のリレー接
点は無接点を図るためにＳＣＲ等の半導体スイッチング
素子を使用してもよい。In this way, in this embodiment, the operation command signal is interlocked until the charging voltage of the smoothing capacitor 2 reaches a predetermined value, so even if the operation command switch remains on, the power can be turned on. As a result, the inverter 13 does not immediately enter the operating state, and the charging resistor 1
1 burnout is prevented. In addition, a semiconductor switching element such as an SCR may be used as the relay contact in the above embodiment in order to achieve a non-contact state.
以上説明したように本発明に工れば、平滑用コンデンサ
の充電電圧が所定値に達するまでの閣は運転指令信号は
インタロックされる。このため、運転指令スイッチをオ
ン状態としたｔまであってもインバータが直ちに運転状
態になることはなくなり、充電用抵抗器の焼損が防止さ
れ、保守性と安全性の向上が図られる。As explained above, according to the present invention, the operation command signal is interlocked until the charging voltage of the smoothing capacitor reaches a predetermined value. Therefore, even if the operation command switch is turned on until t, the inverter does not immediately go into operation, the charging resistor is prevented from burning out, and maintainability and safety are improved.
第１図は本発明の一実施例を示す回路図、第２図は従来
回路を示す図である。
■・・・順変換器、２・・・平滑用コンデンサ、７・・
・比較器、１１・・・充電用抵抗器、１３・・・インバ
ータ、１９・・・運転シーケンス回路、２０・・・アン
ドゲート、ＲＹ。
８８Ｐ ・・・ リ し − 。FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a conventional circuit. ■... Forward converter, 2... Smoothing capacitor, 7...
- Comparator, 11... Charging resistor, 13... Inverter, 19... Operation sequence circuit, 20... AND gate, RY. 88P...Re-shi-.
Claims (1)
コンデンサに充電し、その充電電圧が所定値に達した段
階で前記充電用抵抗器を短絡したうえ、運転指令に基づ
いて逆変換動作を開始するインバータに前記平滑用コン
デンサの充電電圧を印加して所定周波数の交流電力に変
換させるインバータの制御回路において、前記平滑用コ
ンデンサの充電電圧が所定値に達した段階で作動するス
イッチング素子を設け、このスイッチング素子の導通に
よって前記充電用抵抗器を短絡すると共に、インバータ
に与える運転指令のインタロックを解除するように構成
したインバータの制御回路。The DC output voltage of the forward converter is charged to a smoothing capacitor via a charging resistor, and when the charging voltage reaches a predetermined value, the charging resistor is short-circuited and reverse conversion is performed based on the operation command. A switching element that operates when the charging voltage of the smoothing capacitor reaches a predetermined value in an inverter control circuit that applies the charging voltage of the smoothing capacitor to the inverter that starts operation and converts it into AC power of a predetermined frequency. An inverter control circuit configured to short-circuit the charging resistor and release an interlock of an operation command given to the inverter by conduction of the switching element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59278172A JPS61150672A (en) | 1984-12-25 | 1984-12-25 | Control circuit of inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59278172A JPS61150672A (en) | 1984-12-25 | 1984-12-25 | Control circuit of inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61150672A true JPS61150672A (en) | 1986-07-09 |
Family
ID=17593588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59278172A Pending JPS61150672A (en) | 1984-12-25 | 1984-12-25 | Control circuit of inverter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61150672A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102794546A (en) * | 2012-07-12 | 2012-11-28 | 青州泰联电气有限公司 | Control circuit for gas-shielded welding machine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5858824A (en) * | 1981-09-30 | 1983-04-07 | 富士通電装株式会社 | Rush current preventing circuit |
-
1984
- 1984-12-25 JP JP59278172A patent/JPS61150672A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5858824A (en) * | 1981-09-30 | 1983-04-07 | 富士通電装株式会社 | Rush current preventing circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102794546A (en) * | 2012-07-12 | 2012-11-28 | 青州泰联电气有限公司 | Control circuit for gas-shielded welding machine |
| CN102794546B (en) * | 2012-07-12 | 2014-12-10 | 青州泰联电气有限公司 | Control circuit for gas-shielded welding machine |
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