JP2007236107A - Power supply protection circuit - Google Patents

Power supply protection circuit Download PDF

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JP2007236107A
JP2007236107A JP2006054552A JP2006054552A JP2007236107A JP 2007236107 A JP2007236107 A JP 2007236107A JP 2006054552 A JP2006054552 A JP 2006054552A JP 2006054552 A JP2006054552 A JP 2006054552A JP 2007236107 A JP2007236107 A JP 2007236107A
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power supply
smoothing capacitor
relay
overcurrent protection
diode bridge
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JP4797700B2 (en
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Hiroaki Okii
裕朗 沖居
Tetsuya Touda
哲也 塘田
Isamu Yasunobu
勇 安信
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply protection circuit, with high safety at a low cost, for shutting off a power supply even if a smoothing capacitor fails in a short-circuit mode. <P>SOLUTION: This power supply protection circuit includes: a diode bridge 12 for converting an AC input 11 into a DC output, the smoothing capacitor 14 connected to an output end of the diode bridge 12, an overcurrent protection device 13 provided between one of the terminal of the AC power supply 11 and one of the input terminal of the diode bridge 12 and for shutting off the overcurrent, and a relay 17 connected with both ends of the overcurrent protection device 13. The relay 17 is closed when the voltage between the terminals of the smoothing capacitor 14 exceeds a predetermined value, and a signal for driving a motor is input from a control circuit. The overcurrent protection device 13 heat-consumes a charging current of the smoothing capacitor 14 when the relay 17 is opened, electrically opens by the overcurrent of the AC when the smoothing capacitor 14 fails in a short-circuit mode, and shuts off the AC power supply. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、交流電源の保護回路に関し、特に平滑用コンデンサがショートモードで故障したときに、交流電源を遮断するモータ制御装置に関する。   The present invention relates to a protection circuit for an AC power supply, and more particularly to a motor control device that cuts off an AC power supply when a smoothing capacitor fails in a short mode.

従来のモータ制御装置は、交流入力を直流出力に電力変換し、この直流電圧を電源として、インバータ部をスイッチング動作させ、モータに印加する電圧を制御してモータ電流を制御している。   A conventional motor control device converts an AC input into a DC output and uses the DC voltage as a power source to switch the inverter unit to control the voltage applied to the motor to control the motor current.

図３に示すように、交流電源３１をダイオードブリッジ３２で整流し、突入電流抑制抵抗器３３を通して平滑用コンデンサ３４に接続することにより、平滑用コンデンサ３４の両端には交流電源３１のピーク値にほぼ等しい直流電圧が得られる。平滑用コンデンサ３４の端子間電圧が所定値を超えてかつモータを駆動させるための信号が制御回路（図示せず）から入力された時にリレー３７が閉じる。   As shown in FIG. 3, the AC power supply 31 is rectified by the diode bridge 32 and connected to the smoothing capacitor 34 through the inrush current suppression resistor 33, so that the peak value of the AC power supply 31 is at both ends of the smoothing capacitor 34. An approximately equal DC voltage is obtained. When the voltage between the terminals of the smoothing capacitor 34 exceeds a predetermined value and a signal for driving the motor is input from a control circuit (not shown), the relay 37 is closed.

インバータ部３５では平滑用コンデンサ３４の両端の直流電圧をスイッチング動作することによりモータ３６に流れる電流を制御してモータ制御を実現していた (例えば、特許文献１参照)。
特開２００４−１１２９２９号公報 In the inverter unit 35, motor control is realized by controlling the current flowing in the motor 36 by switching the DC voltage across the smoothing capacitor 34 (see, for example, Patent Document 1).
JP 2004-112929 A

解決しようとする問題点は、平滑用コンデンサがショートモードで故障したとき、突入電流抑制抵抗器が整流後の直流ラインにあるため、突入電流抑制抵抗器はアークの発生によって容易に断線せず、安全に電源を遮断できない点である。   The problem to be solved is that when the smoothing capacitor fails in the short mode, the inrush current suppression resistor is in the DC line after rectification, so the inrush current suppression resistor is not easily disconnected by the occurrence of an arc, The point is that the power supply cannot be shut off safely.

このとき、平滑用コンデンサがオープンモードで故障すれば被害は最小限ですむが、ショートモードで故障すると、大電流が継続して突入電流抑制抵抗器に流れ、異常発熱して破壊するなどの問題が発生する。   At this time, if the smoothing capacitor fails in the open mode, the damage will be minimal, but if it fails in the short mode, a large current will continue to flow through the inrush current suppression resistor, causing abnormal heat generation and destruction. Will occur.

また、平滑用コンデンサは、長時間使用するうちに電解液が減り、最悪の場合にはショートモードで故障する可能性があった。   In addition, the smoothing capacitor has a possibility that the electrolytic solution is reduced after being used for a long time, and in the worst case, it may break down in a short mode.

従来のように、突入電流抑制抵抗器を直流ラインに配置すると、入力が３相電源であっても、突入電流抑制抵抗器は１つで済むメリットがある反面、平滑用コンデンサがショートモードで故障したとき、突入電流抑制抵抗器に大電流が流れ、アークの発生によって突入電流抑制抵抗器がすぐに破壊せず、電源を安全に遮断することができなかった。   If an inrush current suppression resistor is placed on the DC line as in the past, even if the input is a three-phase power supply, there is an advantage that only one inrush current suppression resistor is required, but the smoothing capacitor fails in the short mode. When this occurs, a large current flows through the inrush current suppression resistor, and the inrush current suppression resistor is not immediately destroyed by the occurrence of an arc, and the power supply cannot be safely shut off.

本発明は上記従来の課題を解決するものであり、平滑用コンデンサがショートモードで故障した場合であっても、電源を遮断できる安全性の高い電源保護回路を安価に提供することを目的とする。   SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide an inexpensive and highly safe power protection circuit that can shut off power even when a smoothing capacitor fails in a short mode. .

上記の課題を解決するために本発明は、交流入力を直流出力に変換するダイオードブリッジと、前記ダイオードブリッジの出力端に接続された平滑用コンデンサと、交流電源端子の一方と前記ダイオードブリッジ入力端子の一方の間に設けて過電流を遮断する過電流保護手段とを備え、前記リレーは、平滑用コンデンサの端子間電圧が所定値を超えてかつ
モータを駆動させるための信号が制御回路から入力された時に閉じ、前記過電流保護手段は、前記リレーが開のときに平滑用コンデンサの充電電流を熱消費し、平滑用コンデンサがショートモードで故障したときは、交流の過電流によって電気的にオープンにすることで交流電源と遮断する電源保護回路である。 In order to solve the above problems, the present invention provides a diode bridge for converting an AC input into a DC output, a smoothing capacitor connected to an output terminal of the diode bridge, one of AC power supply terminals, and the diode bridge input terminal The relay is provided with an overcurrent protection means for interrupting overcurrent, and the relay inputs a signal for driving the motor when the voltage across the terminals of the smoothing capacitor exceeds a predetermined value from the control circuit. When the relay is open, the overcurrent protection means heats up the charging current of the smoothing capacitor, and when the smoothing capacitor fails in the short mode, the overcurrent protection means is electrically It is a power protection circuit that shuts off AC power by opening it.

また、交流電源が３相のとき、リレーは２接点タイプで、２つ目の接点は、残り２相の一方とダイオードブリッジ入力端子間に接続され、前記２接点は同じ動作をする。   When the AC power supply is three-phase, the relay is a two-contact type, the second contact is connected between one of the remaining two phases and the diode bridge input terminal, and the two contacts perform the same operation.

本発明の電源保護回路によれば、過電流保護手段は正常時には突入電流を抑制して、平滑用コンデンサがショートモードで故障するとリレーは開状態となり、過電流保護手段に大電流が流れる。ところが交流電流なので必ずゼロクロスするためアークは発生せず、過電流保護手段は速やかに電気的にオープンとなり、安全性が向上する。   According to the power protection circuit of the present invention, the overcurrent protection means suppresses the inrush current when it is normal, and when the smoothing capacitor fails in the short mode, the relay is opened and a large current flows through the overcurrent protection means. However, since it is an alternating current, it always causes zero crossing, so no arc is generated, and the overcurrent protection means is quickly electrically opened, improving safety.

また、交流電源が３相の場合でも過電流保護手段は１つでよく、リレーを２接点タイプに置き換えるだけで部品点数が増加することなく、同様の効果が安価に得られる。   Further, even when the AC power supply is three-phase, only one overcurrent protection means is required, and the same effect can be obtained at low cost without increasing the number of parts simply by replacing the relay with a two-contact type.

また、過電流保護手段に電流遮断型ヒューズを用いれば、突入電流抑制抵抗器の焼失を防止でき、温度遮断型ヒューズを用いれば、突入電流抑制抵抗器の異常発熱に対しても安全に電源を遮断できる。   In addition, if a current interrupting fuse is used as the overcurrent protection means, the inrush current suppression resistor can be prevented from being burned out. If a temperature interrupting fuse is used, the power supply can be safely turned off even if the inrush current suppression resistor overheats. Can be blocked.

この電源保護回路を用いることで、平滑用コンデンサがショートモードで故障しても、インバータ部および直流電源などの破壊を防止でき、安全性および信頼性の向上したモータ制御装置を安価に得ることができる。   By using this power protection circuit, even if the smoothing capacitor fails in the short mode, it is possible to prevent the inverter and the DC power source from being destroyed, and to obtain a motor control device with improved safety and reliability at a low cost. it can.

交流入力を直流出力に変換するダイオードブリッジと、前記ダイオードブリッジの出力端に接続された平滑用コンデンサと、交流電源端子の一方と前記ダイオードブリッジ入力端子の一方の間に設けて過電流を遮断する過電流保護手段とを備え、前記リレーは、平滑用コンデンサの端子間電圧が所定値を超えてかつモータを駆動させるための信号が制御回路から入力された時に閉じ、前記過電流保護手段は、前記リレーが開のときに平滑用コンデンサの充電電流を熱消費し、平滑用コンデンサがショートモードで故障したときは、交流の過電流によって電気的にオープンにすることで交流電源と遮断する。また、交流電源が３相のとき、リレーは２接点タイプで、２つ目の接点は、残り２相の一方とダイオードブリッジ入力端子間に接続され、前記２接点は同じ動作をする。   A diode bridge that converts AC input to DC output, a smoothing capacitor connected to the output terminal of the diode bridge, and provided between one of the AC power supply terminals and one of the diode bridge input terminals to block overcurrent. Overcurrent protection means, the relay is closed when the voltage between the terminals of the smoothing capacitor exceeds a predetermined value and a signal for driving the motor is input from the control circuit, the overcurrent protection means, When the relay is open, the charging current of the smoothing capacitor is consumed by heat. When the smoothing capacitor fails in the short mode, it is disconnected from the AC power source by being opened electrically by an AC overcurrent. When the AC power supply is three-phase, the relay is a two-contact type, the second contact is connected between one of the remaining two phases and the diode bridge input terminal, and the two contacts perform the same operation.

実施例１のモータ制御装置の入力電源は、単相電源である。   The input power supply of the motor control device according to the first embodiment is a single-phase power supply.

図１において、交流電源１１の一方は、過電流保護手段１３を介してダイオードブリッジ１２の入力側に接続され、交流電源１１の他方は、ダイオードブリッジ１２の他の入力側に直接接続され、交流電力を直流電力に変換する。   In FIG. 1, one of the AC power supplies 11 is connected to the input side of the diode bridge 12 via the overcurrent protection means 13, and the other of the AC power supplies 11 is directly connected to the other input side of the diode bridge 12. Convert power to DC power.

過電流保護手段１３は、突入電流抑制抵抗器１３ａと、電流遮断型ヒューズ１３ｂとで構成され、直列に接続している。突入電流抑制抵抗器１３ａとしては、巻線タイプの抵抗器が一般的である。   The overcurrent protection means 13 includes an inrush current suppression resistor 13a and a current interrupting fuse 13b, and is connected in series. As the inrush current suppressing resistor 13a, a winding type resistor is generally used.

ダイオードブリッジ１２の正電圧出力端子１２ａは、平滑用コンデンサ１４の正電極端子４ａに接続され、整流ダイオード１２の負電圧出力端子１２ｂは、平滑用コンデンサ１４の負電極端子１４ｂにそれぞれ接続される。   The positive voltage output terminal 12 a of the diode bridge 12 is connected to the positive electrode terminal 4 a of the smoothing capacitor 14, and the negative voltage output terminal 12 b of the rectifier diode 12 is connected to the negative electrode terminal 14 b of the smoothing capacitor 14.

過電流保護手段１３の両端にはリレー１７が接続されており、電源投入時は開状態で、平滑用コンデンサ１４の充電電流を過電流保護手段１３で熱消費する。そして、平滑用コンデンサ１４の端子間電圧が所定値を超えてかつモータを駆動させるための信号が制御回路（図示せず）から入力された時に閉じる。リレー１７の開閉制御は、従来と同様に、平滑用コンデンサ１４の端子間電圧を検出する検出回路（図示せず）およびモータを駆動させるための信号を出力する制御回路で制御される。   A relay 17 is connected to both ends of the overcurrent protection means 13. When the power is turned on, the relay 17 is open and the charging current of the smoothing capacitor 14 is consumed by the overcurrent protection means 13. Then, when the voltage between the terminals of the smoothing capacitor 14 exceeds a predetermined value and a signal for driving the motor is input from a control circuit (not shown), it closes. The open / close control of the relay 17 is controlled by a detection circuit (not shown) that detects the voltage across the smoothing capacitor 14 and a control circuit that outputs a signal for driving the motor, as in the conventional case.

インバータ部１５は、ＩＧＢＴからなり、制御回路から出力されるゲートドライブ信号に基づいてＰＷＭ駆動される。   The inverter unit 15 is made of an IGBT and is PWM driven based on a gate drive signal output from the control circuit.

ところで、モータ制御装置の入力が、交流１００Ｖで設計されている場合、平滑用コンデンサ１４は、定格電圧１６０Ｖ（サージ電圧２００Ｖ，活性電圧２２０Ｖ程度）タイプが通常使用される。これよりも高い定格電圧、例えば３５０Ｖのものを使用することもできるが、形状が大きくなり、値段も高くなるため、必要最小限の使用電圧のものが一般的に選定される。   By the way, when the input of the motor control device is designed with an alternating current of 100 V, the smoothing capacitor 14 is normally of a rated voltage 160 V (surge voltage 200 V, active voltage 220 V) type. A higher rated voltage, for example, 350V can be used. However, since the shape becomes larger and the price becomes higher, the one having the minimum necessary working voltage is generally selected.

交流１００Ｖが接続された場合、過電流保護手段１３、ブリッジダイオード１２を介して、平滑用コンデンサ１４の両端は交流１００Ｖの波高値である直流約１４０Ｖに充電され、この直流電圧を電源としてインバータ部１５はスイッチング動作を行い、モータ１６に流れる電流を変化させることによりモータ制御を実現する。   When AC 100V is connected, both ends of the smoothing capacitor 14 are charged to about 140V DC, which is the peak value of AC 100V, via the overcurrent protection means 13 and the bridge diode 12, and the inverter unit using this DC voltage as a power source 15 performs a switching operation and realizes motor control by changing a current flowing through the motor 16.

しかしながら、モータ制御装置に誤って交流２００Ｖを接続してしまった場合、過電流保護手段１３、ダイオードブリッジ１２を介して平滑用コンデンサ１４の両端は交流２００Ｖの波高値である直流約２８０Ｖまで充電され、平滑用コンデンサ１４は、絶対最大電圧を超えて破壊に至る。   However, if AC 200V is accidentally connected to the motor control device, both ends of the smoothing capacitor 14 are charged up to about 280V DC, which is the peak value of AC 200V, via the overcurrent protection means 13 and the diode bridge 12. The smoothing capacitor 14 exceeds the absolute maximum voltage and leads to destruction.

このとき、平滑用コンデンサ１４がショートモードで破壊した場合、平滑用コンデンサ１４の端子間電圧が降下してリレー１７は開状態となり、過電流保護手段１３およびダイオードブリッジ１２に大電流が流れる。   At this time, when the smoothing capacitor 14 is broken in the short mode, the voltage between the terminals of the smoothing capacitor 14 drops, the relay 17 is opened, and a large current flows through the overcurrent protection means 13 and the diode bridge 12.

ところが、本発明では、過電流保護手段１３を交流電源１１とブリッジダイオード１２間に配置しており、過電流保護手段１３に流れる過電流はゼロクロスする交流電流であるためアークが発生せず、過電流保護手段１３は速やかにオープン状態となるため、安全に交流電源１１と遮断できる。   However, in the present invention, the overcurrent protection means 13 is disposed between the AC power supply 11 and the bridge diode 12, and since the overcurrent flowing through the overcurrent protection means 13 is an AC current that crosses zero, no arc is generated, Since the current protection means 13 is promptly opened, it can be safely disconnected from the AC power supply 11.

なお、本発明の過電流保護手段は、アークの影響を受けず速やかにオープン状態にできるため突入電流抑制抵抗器のみで構成してもよい。また、実施例１の電流遮断型ヒューズを突入電流抑制抵抗器の発熱を検出する温度遮断型ヒューズに置き換えれば、突入電流抑制抵抗器の異常発熱に対しても遮断でき、安全性を確保することができる。   In addition, since the overcurrent protection means of this invention can be made into an open state rapidly, without being influenced by an arc, you may comprise only an inrush current suppression resistor. In addition, if the current interrupting fuse of Example 1 is replaced with a temperature interrupting fuse that detects the heat generation of the inrush current suppression resistor, it is possible to interrupt the abnormal heat generation of the inrush current suppression resistor and to ensure safety. Can do.

実施例２のモータ制御装置の入力電源は、３相電源である。実施例１と比べて、リレー、ダイオードブリッジの構成および接続方法が異なり、以下、相違点を中心に説明する。   The input power supply of the motor control apparatus according to the second embodiment is a three-phase power supply. Compared with the first embodiment, the configuration and connection method of the relay and the diode bridge are different, and the following description will focus on the differences.

図２において、３相交流電源２１をダイオードブリッジ２２で直流に電力変換する。直流電力に変換した後の構成および動作は実施例１と同じである。   In FIG. 2, a three-phase AC power source 21 is converted into DC by a diode bridge 22. The configuration and operation after conversion to DC power are the same as in the first embodiment.

リレー２７は、同時に同じ動作をする２接点タイプで、３相ラインの内、２相のラインとブリッジダイオード２２の入力間に接続する。一方のライン間には過電流保護手段２３
を接続している。 The relay 27 is a two-contact type that performs the same operation at the same time, and is connected between the two-phase line of the three-phase line and the input of the bridge diode 22. Between one line, overcurrent protection means 23
Is connected.

このリレー２７の配置が本発明の特徴であり、過電流保護手段２３を１つ設けるだけで突入電流抑制と過電流遮断の両方が容易に実現できる。   The arrangement of the relay 27 is a feature of the present invention, and both inrush current suppression and overcurrent interruption can be easily realized by providing only one overcurrent protection means 23.

まず、初期動作について説明する。交流電源２１を投入すると、平滑用コンデンサ２４は所定値に充電されておらず、リレー２７は開状態である。   First, the initial operation will be described. When the AC power supply 21 is turned on, the smoothing capacitor 24 is not charged to a predetermined value, and the relay 27 is open.

このため、平滑用コンデンサ２４の端子間電圧が所定値に上昇するまで、２相による電力変換で平滑用コンデンサ２４を充電する。   For this reason, the smoothing capacitor 24 is charged by two-phase power conversion until the voltage between the terminals of the smoothing capacitor 24 rises to a predetermined value.

平滑用コンデンサ２４がフルチャージするまでの充電電流は、過電流保護手段２３である突入電流抑制抵抗器で熱として消費される。   The charging current until the smoothing capacitor 24 is fully charged is consumed as heat by the inrush current suppression resistor which is the overcurrent protection means 23.

そして、平滑用コンデンサ２４の端子間電圧が所定値を超えてかつモータを駆動させるための信号が制御回路（図示せず）から入力されるとリレー２７が閉じ、通常の３相による電力変換に移行する。   When the voltage between the terminals of the smoothing capacitor 24 exceeds a predetermined value and a signal for driving the motor is input from a control circuit (not shown), the relay 27 is closed, and normal three-phase power conversion is performed. Transition.

ところで、モータ制御装置の交流入力２００Ｖに対して、交流４００Ｖの倍電圧が印加されると、実施例１と同様に平滑用コンデンサ２４が破壊する。このとき、ショートモードで故障すると、端子間電圧が降下してリレー２７が開状態となり、過電流保護手段２３に過電流が流れる。実施例１と同様にこの過電流は交流電流なのでアークを発生せず、過電流保護手段２３である突入電流抑制抵抗器は容易にオープン（断線）して速やかに電源を遮断することができる。   By the way, when a double voltage of AC 400V is applied to the AC input 200V of the motor control device, the smoothing capacitor 24 is destroyed as in the first embodiment. At this time, if a failure occurs in the short mode, the voltage between the terminals drops, the relay 27 is opened, and an overcurrent flows through the overcurrent protection means 23. As in the first embodiment, since this overcurrent is an alternating current, no arc is generated, and the inrush current suppression resistor, which is the overcurrent protection means 23, can be easily opened (disconnected) to quickly shut off the power supply.

実施例２の過電流保護手段は、突入電流抑制抵抗器のみの構成で説明したが、実施例１と同様、電流遮断型ヒューズあるいは温度遮断型ヒューズを突入電流抑制抵抗器に直列接続しても同様に実施できる。   The overcurrent protection means of the second embodiment has been described with the configuration of only the inrush current suppression resistor. However, as in the first embodiment, a current interrupting fuse or a temperature interrupting fuse may be connected in series to the inrush current suppression resistor. The same can be done.

なお、２つの実施例ともモータ制御装置を用いて説明したが、モータ制御装置に限定するものではなく、交流入力を直流電力に変換した後に平滑用コンデンサを用いる装置であれば、同様に実施できる。   Although the two embodiments have been described using the motor control device, the present invention is not limited to the motor control device, and any device that uses a smoothing capacitor after converting AC input to DC power can be similarly implemented. .

本発明の電源保護回路は、交流入力を直流電力に変換して使用する制御装置に最適であり、特に３相交流電源を用いる産業用途などに有用である。   The power supply protection circuit of the present invention is most suitable for a control device that uses AC input converted into DC power, and is particularly useful for industrial applications using a three-phase AC power supply.

本発明の実施例１における単相入力のモータ制御装置の要部構成図1 is a block diagram of a main part of a single-phase input motor control apparatus according to Embodiment 1 of the present invention. 本発明の実施例２における３相入力のモータ制御装置の要部構成図The principal part block diagram of the motor control apparatus of the three-phase input in Example 2 of this invention 従来のモータ制御装置の要部構成図Main part configuration diagram of conventional motor control device

符号の説明Explanation of symbols

１１，２１ 交流電源
１２，２２ ダイオードブリッジ
１３，２３ 過電流保護手段
１３ａ 突入電流抑制抵抗器
１３ｂ 電流遮断型ヒューズ
１４，２４ 平滑用コンデンサ
１５，２５ インバータ部
１６，２６ モータ
１７，２７ 電源リレー

11, 21 AC power supply 12, 22 Diode bridge 13, 23 Overcurrent protection means 13a Inrush current suppression resistor 13b Current interruption type fuse 14, 24 Smoothing capacitor 15, 25 Inverter section 16, 26 Motor 17, 27 Power relay

Claims (5)

交流入力を直流出力に変換するダイオードブリッジと、前記ダイオードブリッジの出力端に接続された平滑用コンデンサと、交流電源端子の一方と前記ダイオードブリッジ入力端子の一方の間に設けて過電流を遮断する過電流保護手段と、前記過電流保護手段の両端に接続したリレーとを備え、前記リレーは、平滑用コンデンサの端子間電圧が所定値を超えてかつモータを駆動させるための信号が制御回路から入力された時に閉じ、前記過電流保護手段は、前記リレーが開のときに平滑用コンデンサの充電電流を熱消費し、平滑用コンデンサがショートモードで故障したときは、交流の過電流によって電気的にオープンにすることで交流電源を遮断する電源保護回路。 A diode bridge that converts AC input to DC output, a smoothing capacitor connected to the output terminal of the diode bridge, and provided between one of the AC power supply terminals and one of the diode bridge input terminals to block overcurrent. An overcurrent protection means; and a relay connected to both ends of the overcurrent protection means. The relay receives a signal from the control circuit for driving the motor when the voltage across the terminals of the smoothing capacitor exceeds a predetermined value. It closes when input, and the overcurrent protection means heats the charging current of the smoothing capacitor when the relay is open, and when the smoothing capacitor fails in the short mode, the overcurrent protection means A power protection circuit that shuts off the AC power supply when opened. 交流電源が３相のとき、リレーは２接点タイプで、２つ目の接点は、残り２相の一方とダイオードブリッジ入力端子間に接続され、前記２接点は同じ動作をする請求項１に記載の電源保護回路。 2. The relay according to claim 1, wherein when the AC power supply has three phases, the relay is a two-contact type, and the second contact is connected between one of the remaining two phases and the diode bridge input terminal, and the two contacts perform the same operation. Power protection circuit. 過電流保護手段は、少なくとも突入電流抑制抵抗器または前記突入電流抑制抵抗器と直列接続した電流遮断型ヒューズにより構成した請求項１または請求項２に記載の電源保護回路。 3. The power protection circuit according to claim 1, wherein the overcurrent protection means includes at least an inrush current suppression resistor or a current interruption type fuse connected in series with the inrush current suppression resistor. 過電流保護手段は、少なくとも突入電流抑制抵抗器と直列接続され、前記突入電流抑制抵抗器の異常発熱を検出する温度遮断型ヒューズにより構成した請求項１または請求項２に記載の電源保護回路。 3. The power supply protection circuit according to claim 1, wherein the overcurrent protection unit includes a temperature interrupting fuse that is connected in series with at least an inrush current suppression resistor and detects abnormal heat generation of the inrush current suppression resistor. 請求項１から請求項４のいずれか１項記載の電源保護回路を搭載したモータ制御装置。
The motor control apparatus carrying the power supply protection circuit of any one of Claims 1-4.
JP2006054552A 2006-03-01 2006-03-01 Motor control device Active JP4797700B2 (en)

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CN111707341A (en) * 2020-06-24 2020-09-25 北京恒通安泰科技有限公司 Data acquisition device and data acquisition method for rail weighbridge and rail weighbridge

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Publication number Priority date Publication date Assignee Title
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