WO1998027641A1 - Overvoltage protective circuit for step-down converter - Google Patents

Overvoltage protective circuit for step-down converter Download PDF

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Publication number
WO1998027641A1
WO1998027641A1 PCT/JP1997/004685 JP9704685W WO9827641A1 WO 1998027641 A1 WO1998027641 A1 WO 1998027641A1 JP 9704685 W JP9704685 W JP 9704685W WO 9827641 A1 WO9827641 A1 WO 9827641A1
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WIPO (PCT)
Prior art keywords
voltage
circuit
scr
short
converter
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Application number
PCT/JP1997/004685
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French (fr)
Japanese (ja)
Inventor
Shinichi Kono
Hajime Makita
Original Assignee
Fanuc Ltd
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Publication of WO1998027641A1 publication Critical patent/WO1998027641A1/en

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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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/145—Conversion of ac power input into dc 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
    • H02M7/155—Conversion of ac power input into dc 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
    • H02M7/162—Conversion of ac power input into dc 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 in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
    • H02H7/1252—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device

Definitions

  • the present invention relates to a protection circuit for protecting an electric device connected to a step-down converter from overvoltage.
  • the step-down converter is used to reduce the input high voltage to output a low voltage, and to supply the low voltage to electric equipment connected to the step-down converter. .
  • a drive device for a feed shaft motor that drives a feed shaft of a machine tool includes a step-down converter that converts a commercial AC three-phase power supply to a DC voltage, and a converter that converts the converted DC voltage.
  • An inverter for converting the voltage into a variable voltage and variable frequency alternating current is provided to stably control the rotation of the motor to be driven.
  • the overvoltage protection circuit includes an input connected to an AC power supply.
  • a step-down converter having a power line and an output line connected to an electric device; a voltage detection circuit for detecting a voltage of the output line; and a short-circuit circuit connected to the voltage detection circuit for short-circuiting the output line.
  • a protective relay inserted into the input line.
  • the voltage detection circuit outputs a detection signal to the short circuit when detecting a voltage equal to or higher than a predetermined voltage set as an overvoltage, and the short circuit outputs when a detection signal is input from the voltage detection circuit. Is short-circuited and the protection relay is activated to cut off the input from the AC power supply.
  • a commercial AC three-phase power supply is used as the AC power supply, and a thyristor is used to short-circuit the output line of the step-down converter.
  • FIG. 1 is a main part circuit diagram of an overvoltage protection circuit according to one embodiment of the present invention.
  • FIG. 1 shows an example in which the present invention is applied to a phase angle control type thyristor bridge step-down converter.
  • the inverter M is connected to the inverter 12 and the S converter 20, and the rotation of the motor M is controlled by the inverter 12.
  • the anode of thyristor SCR1 is connected to the force source of SCR2, and the force source of SCR1 is connected to one of the converters 20 via a diode 16 connected in the forward direction.
  • the output terminal 14 of the SCR 2 is connected to the other output terminal 15 of the connector 20.
  • the force source of SCR 3 and SCR 5 and the force source of SCR 4 and SCR 6 are The SCR 3 and SCR 5 force sources are connected to the output terminal 14 via a forward connected diode 16, and the SCR 4 and SCR 6 nodes are connected to the output terminal. Connected to 1 5.
  • the R, S, and T phases of a commercial AC three-phase power supply are connected to SCR 1 and SCR 2, SCR 3 and SCR 4 and SCR 5 via fuses 9 R and 9 S 9 T as protective relays.
  • a smoothing capacitor 8 is connected between both output terminals 14 and 15.
  • the gates of SCR 1 to SCR 6 are connected to the thyristor firing control circuit 11.
  • the configuration described above is the configuration of the phase angle control type thyristor-plunger step-down converter 20.
  • the voltage between the output terminals 14 and 15 is set between the output terminals 14 and 15.
  • the voltage detection circuit 10 to be detected is connected, the anode of the SCR 7 forming a short circuit is connected to the anode of the diode 16, and the power source of the SCR 7 is connected to the output terminal 15. ing .
  • the output of the voltage detection circuit 10 is connected to the thyristor firing circuit 11, and the thyristor firing circuit 11 is connected to the gate of the SCR 7 so that the SCR 7 can be fired.
  • the sea is squatting.
  • the configuration of the step-down converter 20 is the same as the configuration of the conventional phase angle control type thyristor-bridge type buck converter, except that the SCR 7, the voltage detection circuit 10 and the thyristor firing are used.
  • the point that the SCR 7 can be fired by the circuit 11 is different from the conventional one.
  • the output terminals 14 and 15 of the converter are connected to the input terminal of the inverter 12, and the output of the inverter 12 is connected to the terminal of each phase of the motor.
  • a three-phase AC power supply of R, S, and T phases is connected to the input terminal of the converter, and the firing circuit 11 controls the firing of SCR 1 to SCR 6 by the firing circuit 11 as in the past. 6 and rectify the phase and perform phase angle control to output a predetermined DC voltage between both terminals 14 and 15.
  • the maximum A voltage of 65 V peak value of AC 46 OV is output from the inverter and applied to the inverter 12.
  • the output voltage of the converter 20 is changed according to the present invention.
  • a set voltage for example, 400 V
  • an output signal is output to the thyristor firing circuit 11 and the thyristor firing circuit 11 outputs the signal.
  • a gate current is supplied to the gate of SCR 7 to make SCR 7 conductive and short-circuit the output terminal of converter 20.
  • the elements that short-circuit the output of the converter 20 include transistors other than SCR7, IGBTs (insulated good bipolar transistors), and GTOs (gate turns). Off thyristor). You can use a worst switching element.
  • the input of the converter is immediately cut off, so that the low-voltage inverter connected to the output terminal of the converter is used. This can prevent the destruction of equipment such as data.

Abstract

An overvoltage protective circuit with a simple constitution for step-down converter which inexpensively protects the apparatus connected to a step-down converter from overvoltages. An SCR (7) is connected between the output terminals of the converter. A voltage detecting circuit (10) detects the voltage across the output terminals. When the voltage exceeds a preset abnormal voltage, outputs a signal. When the circuit (10) outputs the signal, a thyristor firing circuit (11) allows the SCR (7) to conduct. As a result, one of fuses 9R-9T is blown and the power is interrupted, because input terminals are short-circuited through two conducting SCRs of SCRs 1-6.

Description

明 細 書  Specification
降圧形コ ンバータの過電圧保護回路  Overvoltage protection circuit for step-down converter
技 術 分 野  Technical field
本発明は 、 降圧形コ ンバータ に接続される 電気機器を 過電圧か ら保護する保護回路に関する 。  The present invention relates to a protection circuit for protecting an electric device connected to a step-down converter from overvoltage.
背 景 技 術  Background technology
降圧形コ ンバータ は 、 入力 された高電圧を低下させて 低電圧を出力し 、 こ の低電圧を降圧形コ ンバ ータ に接続 さ れた電気機器に供給する も の と して利用 さ れる 。  The step-down converter is used to reduce the input high voltage to output a low voltage, and to supply the low voltage to electric equipment connected to the step-down converter. .
例えば 、 工作機械の送 り 軸を駆動する 送 り 軸モー タ の 駆動装置にあっ ては 、 商用交流 3 相電源を直流電圧に変 換する 降圧形コ ンバータ と 、 こ の変換された直流電圧を 可変電圧 、 可変周波数の交流に変換する イ ンバ ータ と を 備え 、 これによ つ て駆動对象であ る モータ を安定して回 転制御し ている 。  For example, a drive device for a feed shaft motor that drives a feed shaft of a machine tool includes a step-down converter that converts a commercial AC three-phase power supply to a DC voltage, and a converter that converts the converted DC voltage. An inverter for converting the voltage into a variable voltage and variable frequency alternating current is provided to stably control the rotation of the motor to be driven.
一般に 、 電気機器は定格を超え る過大な電圧が印加さ れる と機器の破損を引 き起こす。 通常 、 A C 2 0 0 V入 力のコ ンバータ は 3 相ダイオー ドブ リ ッ ジ回路を用い ら れたも のが多 く 、 その直流電圧を利用する機器の最大定 格電圧は 4 5 0 V〜 6 0 O Vである 。 そのため 、 過電圧 検出レ ベルを 4 0 O V に設定すれば 、 通常動作において ア ラームが発生する こ と も 、 ま してや機器の部品を破損 させる こ と も ない 。 例えば 、 モータ減速時のエネルギー の電源回生能力不足や外来サージによ っ て直流電圧部分 が充電さ れた結果 、 過電圧ア ラー ム発生レ ベル に達する よ う な場合でも 、 電圧は徐々 に増加する ため 、 過電圧を 検出 し て数 + m s e c 後に入力電源を電磁接触器で切断 する こ と によ り 、 コ ンバータ に接続さ れた電気機器を保 護する こ と ができ る 。 Generally, when an excessive voltage exceeding the rating is applied to an electric device, the device is damaged. Usually, converters with AC 200 V input use a three-phase diode bridge circuit, and the maximum rated voltage of equipment that uses the DC voltage is 450 V or more. 60 OV. Therefore, if the overvoltage detection level is set to 40 OV, no alarm is generated during normal operation, and even no damage is caused to the components of the device. For example, when the DC voltage portion is charged due to insufficient power regenerative capability of energy during motor deceleration or an external surge, an overvoltage alarm occurrence level is reached. Even in such a case, the voltage gradually increases.Therefore, by detecting the overvoltage and disconnecting the input power with a magnetic contactor a few + msec later, the electrical equipment connected to the converter is protected. can do .
一方 、 欧米の よ う に 、 商用入力電圧が高 く （ 例えば A C 4 6 0 V ) 、 これを位相角制御等を用いたコ ンバータ で降圧する よ う な場合 、 例えば 、 A C入力電圧が 4 6 0 Vで D C 3 0 0 V に降圧する コ ンバータ を用い 、 こ のコ ンノ ータ に上述し た電圧定格が 4 5 0 V〜 6 0 0 Vの A C 2 0 0 V用の機器 （ イ ンバータ ） を接続し て使用する 場合には 、 上述したよ う な不具合によ っ て入力の高い電 圧 6 5 0 V ( 4 6 0 V a c X 2 1 / 2 ：) が瞬時の内に低圧 部分の機器 （ イ ンバータ ） に印加される 可能性がある 。 On the other hand, as in Europe and the United States, when the commercial input voltage is high (for example, AC460 V) and the voltage is stepped down by a converter using phase angle control or the like, for example, when the AC input voltage is 46 A converter that steps down to 300 V DC at 0 V is used, and the above-mentioned equipment for AC 200 V with a voltage rating of 450 V to 600 V (inverter) is connected to this converter. ), The high input voltage 65 0 V (460 V ac X 2 1/2 :) is instantaneously applied to the low voltage part due to the above-mentioned problem. May be applied to other devices (inverters).
こ の よ う な場合 、 従来の よ う に電圧検出を行ない電磁 接触器で入力を遮断する方式を用い る と 、 最低数十 m s e c 間 、 高い電圧がコ ンバータ に接続された電気機器に 印加される こ と にな り 、 該機器の保護が困難である 。 ま た こ の対策 と して 、 低圧用の機器を構成する 部品の耐圧 を上げる よ う にする と 、 コ ス ト が高 く なる と い う 問題が ある 。  In such a case, if the voltage is detected and the input is cut off by an electromagnetic contactor as in the past, a high voltage is applied to the electrical equipment connected to the converter for at least several tens of milliseconds. As a result, it is difficult to protect the device. Also, as a countermeasure, if the withstand voltage of the components constituting the low-voltage device is increased, the cost increases.
発 明 の 開 示  Disclosure of the invention
本発明の 目 的は 、 簡単且つ低コ ス ト で低圧部分の電気 機器を保護する こ と ができ る 降圧形コ ンバ ー タ の過電圧 保護回路を提供する こ と にあ る 。  It is an object of the present invention to provide an overvoltage protection circuit for a step-down converter that can protect electric equipment in a low-voltage portion easily and at low cost.
本発明の過電圧保護回路は 、 交流電源に接続される入 力線と 、 電気機器に接続される 出力線と を有する 降圧形 コ ンバータ と 、 出力線の電圧を検出する電圧検出回路 と 電圧検出回路に接続され 、 出力線を短絡させる ための短 絡回路 と 、 入力線に揷入された保護継電器と を備える 。 電圧検出回路は 、 過電圧 と して設定された所定電圧以上 の電圧を検出した と き前記短絡回路に検出信号を出力 し 短絡回路は前記電圧検出回路か ら検出信号が入力 された と き 出力線を短絡させ 、 保護継電器を作動させて交流電 源か らの入力を遮断する 。 交流電源 と し て 、 商用の交流 3 相電源が用い られ 、 降圧形コ ンバ ー タ の出力線を短絡 させる ため にサイ リ ス タ が用い られる 。 The overvoltage protection circuit according to the present invention includes an input connected to an AC power supply. A step-down converter having a power line and an output line connected to an electric device; a voltage detection circuit for detecting a voltage of the output line; and a short-circuit circuit connected to the voltage detection circuit for short-circuiting the output line. And a protective relay inserted into the input line. The voltage detection circuit outputs a detection signal to the short circuit when detecting a voltage equal to or higher than a predetermined voltage set as an overvoltage, and the short circuit outputs when a detection signal is input from the voltage detection circuit. Is short-circuited and the protection relay is activated to cut off the input from the AC power supply. A commercial AC three-phase power supply is used as the AC power supply, and a thyristor is used to short-circuit the output line of the step-down converter.
図面の簡単な説明  BRIEF DESCRIPTION OF THE FIGURES
図 1 は 、 本発明の一実施例に係る過電圧保護回路の要 部回路図である 。  FIG. 1 is a main part circuit diagram of an overvoltage protection circuit according to one embodiment of the present invention.
発明を実施する ため の最良の形態 図 1 は 、 位相角制御式サイ リ ス タブ リ ッ ジ降圧コ ンパ 一タ に本発明を適用 した例を示す 。 こ の例では 、 イ ンバ ータ 1 2 力 Sコ ンノ ータ 2 0 に接続され 、 イ ンバータ 1 2 によ っ てモータ Mが回転駆動制御される 。  BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 shows an example in which the present invention is applied to a phase angle control type thyristor bridge step-down converter. In this example, the inverter M is connected to the inverter 12 and the S converter 20, and the rotation of the motor M is controlled by the inverter 12.
サイ リ ス タ S C R 1 のア ノ ー ド は S C R 2 の力 ソー ド に接続さ れ 、 S C R 1 の力 ソー ド は 、 順方向 に接続され たダイオー ド 1 6 を介してコ ンバータ 2 0 の一方の出力 端子 1 4 に 、 S C R 2 のア ノ ー ド はコ ンノ ータ 2 0 の他 方の出力端子 1 5 に接続されている 。 同様に 、 S C R 3 S C R 5 のア ノ ー ド と S C R 4 、 S C R 6 の力 ソー ド が それぞれ接続され 、 S C R 3 、 S C R 5 の力 ソー ド は 、 順方向に接続されたダイオー ド 1 6 を介して出力端子 1 4 に接続され 、 S C R 4 、 S C R 6 のア ノ ー ド は出力端 子 1 5 に接続されている 。 商用び交流 3 相電源の R相 、 S 相 、 T相は 、 保護継電器と し て の ヒ ュ ーズ 9 R , 9 S 9 T を介して S C R 1 と S C R 2 、 S C R 3 と S C R 4 S C R 5 と S C R 6 の接続点にそれぞれ接続されている また 、 両出力端子 1 4 ， 1 5 間には平滑コ ンデンサ 8 が 接続されている 。 なお 、 図 1 では省略されている が 、 S C R 1 〜 S C R 6 の各ゲー ト と サイ リ ス タ点弧制御回路 1 1 は接続されている 。 The anode of thyristor SCR1 is connected to the force source of SCR2, and the force source of SCR1 is connected to one of the converters 20 via a diode 16 connected in the forward direction. The output terminal 14 of the SCR 2 is connected to the other output terminal 15 of the connector 20. Similarly, the force source of SCR 3 and SCR 5 and the force source of SCR 4 and SCR 6 are The SCR 3 and SCR 5 force sources are connected to the output terminal 14 via a forward connected diode 16, and the SCR 4 and SCR 6 nodes are connected to the output terminal. Connected to 1 5. The R, S, and T phases of a commercial AC three-phase power supply are connected to SCR 1 and SCR 2, SCR 3 and SCR 4 and SCR 5 via fuses 9 R and 9 S 9 T as protective relays. A smoothing capacitor 8 is connected between both output terminals 14 and 15. Although not shown in FIG. 1, the gates of SCR 1 to SCR 6 are connected to the thyristor firing control circuit 11.
以上の構成が 、 位相角制御方式サイ リ ス タプ リ ッ ジ降 圧コ ンバータ 2 0 の構成である が 、 本実施例では 、 両出 力端子 1 4 , 1 5 間に出力端子間の電圧を検出する 電圧 検出回路 1 0 が接続され 、 更に 、 短絡回路を形成する S C R 7 のア ノー ド がダイオー ド 1 6 のア ノ ー ド に 、 S C R 7 の力 ソー ド が出力端子 1 5 に接続されている 。 また 電圧検出回路 1 0 の出力はサイ リ ス タ 点弧回路 1 1 に接 続され 、 サイ リ ス タ 点弧回路 1 1 は S C R 7 のゲー ト に 接続され 、 S C R 7 を点弧でき る よ う になつ ている 。  The configuration described above is the configuration of the phase angle control type thyristor-plunger step-down converter 20. In this embodiment, the voltage between the output terminals 14 and 15 is set between the output terminals 14 and 15. The voltage detection circuit 10 to be detected is connected, the anode of the SCR 7 forming a short circuit is connected to the anode of the diode 16, and the power source of the SCR 7 is connected to the output terminal 15. ing . The output of the voltage detection circuit 10 is connected to the thyristor firing circuit 11, and the thyristor firing circuit 11 is connected to the gate of the SCR 7 so that the SCR 7 can be fired. The sea is squatting.
降圧形コ ンバータ 2 0 の構成は従来の位相角制御方式 サイ リ ス タブ リ ッ ジ降圧コ ンバ ー タ の構成 と 同様である が 、 S C R 7 、 電圧検出回路 1 0 及びサイ リ ス タ点弧回 路 1 1 によ っ て S C R 7 を点弧でき る よ う にした点が従 来 と 異なる 。 また 、 コ ンバータ の出力端子 1 4 , 1 5 はイ ンバ一タ 1 2 の入力端子に接続され 、 イ ンバータ 1 2 の出力はモ 一タ の各相の端子に接続されている 。 The configuration of the step-down converter 20 is the same as the configuration of the conventional phase angle control type thyristor-bridge type buck converter, except that the SCR 7, the voltage detection circuit 10 and the thyristor firing are used. The point that the SCR 7 can be fired by the circuit 11 is different from the conventional one. The output terminals 14 and 15 of the converter are connected to the input terminal of the inverter 12, and the output of the inverter 12 is connected to the terminal of each phase of the motor.
コ ンバ ー タ の入力端子に R ， S , T相の 3 相交流電源 が接続され 、 従来と 同様に点弧回路 1 1 によ っ て S C R 1 〜 S C R 6 の点弧を制御して S C R 1 〜 6 で整流し位 相角制御を行なっ て所定の直流電圧を両端子 1 4 ， 1 5 間に出力する 。  A three-phase AC power supply of R, S, and T phases is connected to the input terminal of the converter, and the firing circuit 11 controls the firing of SCR 1 to SCR 6 by the firing circuit 11 as in the past. 6 and rectify the phase and perform phase angle control to output a predetermined DC voltage between both terminals 14 and 15.
例えば 、 三相入力電圧が 4 6 0 Vで 、 位相角制御によ り 出力する 直流電圧が 3 0 O V に制御している場合に 、 入力の S C R 1 〜 S C R 6 が誤点弧する と 、 最大 6 5 0 V ( 交流 4 6 O Vのピ ー ク値 ） の電圧がコ ンノ 一タカ、 ら 出力 されイ ンバータ 1 2 に印加される こ と になる 。  For example, when the three-phase input voltage is 460 V and the DC voltage output by the phase angle control is controlled to 30 OV, if the input SCR 1 to SCR 6 misfire, the maximum A voltage of 65 V (peak value of AC 46 OV) is output from the inverter and applied to the inverter 12.
そ こで 、 こ の過電圧か ら低圧回路である イ ンバータ 1 2 の各部品 （ ス イ ッ チ ン グ素子等 ） を保護する ため に 、 本発明 においては 、 コ ンバータ 2 0 の出力電圧を電圧検 出回路 1 0 で検出し 、 設定電圧 （ 例えば 4 0 0 V ) 以上 になる と 、 出力信号をサイ リ ス タ点弧回路 1 1 に出力し サイ リ ス タ点弧回路 1 1 は 、 こ の信号を受けて S C R 7 のゲー ト にゲー ト 電流を流し 、 S C R 7 を導通 させ 、 コ ンバータ 2 0 の出力端子を短絡する 。 その結果 、 その時 導通し ている S C R 1 〜 S C R 6 を介し て過大電流が流 れヒ ユーズ 9 R〜 9 Tのいずれかを溶断する 。  In order to protect each component (switching element, etc.) of the inverter 12 as a low-voltage circuit from this overvoltage, the output voltage of the converter 20 is changed according to the present invention. When the voltage is detected by the detection circuit 10 and becomes equal to or higher than a set voltage (for example, 400 V), an output signal is output to the thyristor firing circuit 11 and the thyristor firing circuit 11 outputs the signal. In response to this signal, a gate current is supplied to the gate of SCR 7 to make SCR 7 conductive and short-circuit the output terminal of converter 20. As a result, an excessive current flows through the SCR1 to SCR6 that are conducting at that time, and blows any one of the fuses 9R to 9T.
例えば 、 S C R 1 と S C R 6 が導通している と き に 、 異常電圧が検出 さ れ 、 S C R 7 が導通する と 、 S C R 1 S C R 7 、 S C R 6 を介 し て R相 と T相の入力端子が短 絡さ れる こ と にな り 、 ヒ ュ ーズ 9 R , 9 T が溶断さ れる こ と にな り 過電圧が低圧回路であ る イ ンパ ー タ 1 2 に印 加 さ れる のが防止 さ れる 。 For example, when an abnormal voltage is detected when SCR 1 and SCR 6 are conducting, and when SCR 7 is conducting, SCR 1 The R-phase and T-phase input terminals are short-circuited via SCR7 and SCR6, and fuses 9R and 9T are blown. It is prevented from being applied to the impeller 12 which is.
なお 、 コ ンバー タ 2 0 の 出力を短絡さ せる 素子 と し て は 、 S C R 7 以外の ト ラ ンジス タや I G B T ( 絶縁グー ト バイ ポー ラ 形 ト ラ ンジス タ ） 、 G T O ( ゲー ト タ ーン オフ サイ リ ス タ ） 等のノヽ。ワ ース イ ッ チ ング素子を用いて あ よ い 。  The elements that short-circuit the output of the converter 20 include transistors other than SCR7, IGBTs (insulated good bipolar transistors), and GTOs (gate turns). Off thyristor). You can use a worst switching element.
本発明 においては 、 過電圧がコ ンバー タ か ら 出力 さ れ た場合 、 即時にコ ンバータ の入力を遮断する の で 、 コ ン バ ー タ の 出力端子に接続さ れた低電圧系のィ ンバ ー タ 等 の機器の破壊を防止する こ と ができ る 。  In the present invention, when an overvoltage is output from the converter, the input of the converter is immediately cut off, so that the low-voltage inverter connected to the output terminal of the converter is used. This can prevent the destruction of equipment such as data.

Claims

請 求 の 範 囲 The scope of the claims
1 . 降圧形コ ンバータ に接続される 電気機器を過電圧か ら保護する保護回路であっ て 、 1. A protection circuit that protects the electrical equipment connected to the buck converter from overvoltage.
交流電源に接続される入力線と 、 前記電気機器に接続 される 出力線と を有する 降圧形コ ンバータ と 、  A step-down converter having an input line connected to an AC power supply, and an output line connected to the electric device;
前記出力線の電圧を検出する電圧検出回路 と 、 前記電圧検出回路に接続され 、 前記出力線を短絡させ る ための短絡回路 と 、  A voltage detection circuit for detecting a voltage of the output line; a short-circuit circuit connected to the voltage detection circuit for short-circuiting the output line;
前記入力線中に挿入された保護継電器と を備え 、 前記電圧検出回路は 、 過電圧 と し て設定された所定電 圧以上の電圧を検出 した と き前記短絡回路に検出信号を 出力 し 、 前記短絡回路は前記電圧検出回路か ら前記検出 信号が入力 された と き前記出力線を短絡させ 、 前記保護 継電器を作動させて前記交流電源か らの入力を遮断する 過電圧保護回路。  A protection relay inserted into the input line, wherein the voltage detection circuit outputs a detection signal to the short circuit when detecting a voltage higher than a predetermined voltage set as an overvoltage, and An overvoltage protection circuit that short-circuits the output line when the detection signal is input from the voltage detection circuit, activates the protection relay, and cuts off input from the AC power supply.
2 . 前記交流電源は 、 商用の交流 3 相電源である 、 請求 の範囲第 1 項に記載の過電圧保護回路。  2. The overvoltage protection circuit according to claim 1, wherein the AC power supply is a commercial AC three-phase power supply.
3 . 前記短絡回路は 、 前記出力線を短絡させる ためのサ イ リ ス タ を備える 、 請求の範囲第 1 項に記載の過電圧保 護回路 。  3. The overvoltage protection circuit according to claim 1, wherein the short circuit includes a thyristor for short-circuiting the output line.
PCT/JP1997/004685 1996-12-18 1997-12-18 Overvoltage protective circuit for step-down converter WO1998027641A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8353722A JPH10178779A (en) 1996-12-18 1996-12-18 Overvoltage preventive circuit in step-down converter
JP8/353722 1996-12-18

Publications (1)

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WO1998027641A1 true WO1998027641A1 (en) 1998-06-25

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Cited By (4)

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US6355127B1 (en) * 1998-04-27 2002-03-12 The Dow Chemical Company Cure on demand adhesives and window module with cure on demand adhesive thereon
WO2004102785A1 (en) * 2003-05-13 2004-11-25 Newage International Limited An electrical power supply system and a permanent magnet generator for such a system
EP2065993A1 (en) * 2007-11-28 2009-06-03 Siemens Schweiz AG Voltage transformer assembly
US8369050B2 (en) 2008-04-21 2013-02-05 Aeg Power Solutions B.V. Circuit for protecting a DC network with DC loads against overvoltage

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JP4651832B2 (en) * 2001-03-05 2011-03-16 富士通セミコンダクター株式会社 Overvoltage protection device for power system
JP4851814B2 (en) * 2006-03-01 2012-01-11 株式会社東芝 Power system
WO2010082317A1 (en) * 2009-01-14 2010-07-22 東芝三菱電機産業システム株式会社 Protection circuit used in wind power generation system including double-fed induction generator
JP6773610B2 (en) * 2017-06-26 2020-10-21 東芝三菱電機産業システム株式会社 Voltage abnormality detector
JP6513293B1 (en) * 2017-12-15 2019-05-15 三菱電機株式会社 Motor drive system and inverter device

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6355127B1 (en) * 1998-04-27 2002-03-12 The Dow Chemical Company Cure on demand adhesives and window module with cure on demand adhesive thereon
WO2004102785A1 (en) * 2003-05-13 2004-11-25 Newage International Limited An electrical power supply system and a permanent magnet generator for such a system
US7274547B2 (en) 2003-05-13 2007-09-25 Cummins Generator Technologies Limited Electrical power supply system and a permanent magnet generator for such a system
EP2065993A1 (en) * 2007-11-28 2009-06-03 Siemens Schweiz AG Voltage transformer assembly
US8369050B2 (en) 2008-04-21 2013-02-05 Aeg Power Solutions B.V. Circuit for protecting a DC network with DC loads against overvoltage
DE102008020030B4 (en) 2008-04-21 2022-05-19 Aeg Power Solutions Gmbh Circuit arrangement with a rectifier and a circuit for protecting at least one direct-current network with direct-current loads that can be connected to the circuit arrangement against overvoltage

Also Published As

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