JPH05223906A - Ground fault detection controller - Google Patents
Ground fault detection controllerInfo
- Publication number
- JPH05223906A JPH05223906A JP2967392A JP2967392A JPH05223906A JP H05223906 A JPH05223906 A JP H05223906A JP 2967392 A JP2967392 A JP 2967392A JP 2967392 A JP2967392 A JP 2967392A JP H05223906 A JPH05223906 A JP H05223906A
- Authority
- JP
- Japan
- Prior art keywords
- ground fault
- current
- contactor
- resistor
- voltage
- 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
Landscapes
- Inverter Devices (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
- Protection Of Static Devices (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、電動機を駆動する制
御装置に係るものであり、より詳しくは、電動機の誤接
続をすみやかに検出するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for driving an electric motor, and more specifically to promptly detecting an erroneous connection of the electric motor.
【０００２】[0002]
【従来の技術】図６〜図８に従来の制御装置を示す。図
６において、１は３相商用電源、１７は制御回路とパワ
ー回路が分離出来るコンタクタ、３は三相を全波整流す
るダイオードモジュール、１９は突入電流制限抵抗、１
８は突入電流制限抵抗１９を短絡するパワーリレー、６
は平滑コンデンサ、８はＤＣ−ＡＣ変換するインバータ
回路、７はインバータ回路８を保護する為の電流検出抵
抗、９ａ、９ｂは出力電流検出用ＤＣＣＴ、１０は電動
機、１１は制御部を動作させる為の制御電源部、１２は
平滑コンデンサ６の電圧を検出する為の電圧検出部、１
３はインバータ回路８へ流れ込む電流を検出する電流検
出部、１４はインバータ回路８を駆動させるベース駆動
部、１５は出力電流検出用ＤＣＣＴ９ａ、９ｂの電流を
検出する電流検出部、１６は比較判定部である。2. Description of the Related Art FIGS. 6 to 8 show conventional control devices. In FIG. 6, 1 is a three-phase commercial power supply, 17 is a contactor capable of separating a control circuit and a power circuit, 3 is a diode module for full-wave rectifying three phases, 19 is an inrush current limiting resistor, 1
8 is a power relay that short-circuits the inrush current limiting resistor 19, 6
Is a smoothing capacitor, 8 is an inverter circuit for DC-AC conversion, 7 is a current detection resistor for protecting the inverter circuit 8, 9a and 9b are output current detection DCCTs, 10 is a motor, and 11 is for operating a control unit. Control power supply unit 12, a voltage detection unit 12 for detecting the voltage of the smoothing capacitor 6,
Reference numeral 3 is a current detection unit that detects a current flowing into the inverter circuit 8, 14 is a base drive unit that drives the inverter circuit 8, 15 is a current detection unit that detects the current of the output current detection DCCTs 9a and 9b, and 16 is a comparison determination unit. Is.
【０００３】次に動作について図６〜図８により説明す
る。コンダクタ１７をＯＮすると、３相商用電源の電圧
がダイオードモジュール３にかかり三相全波整流され
る。突入防止抵抗１９をかえして平滑コンデンサ６に電
流が流れ充電され平滑しＤＣ電源を得ると、突入制限抵
抗１９をパワーリレー１８は短絡する。インバータ回路
８は、ベース駆動部１４の信号によりＤＣ−ＡＣ変換さ
れ、電動機１０へＡＣ電流を流す。電流検出用ＤＣＣＴ
９ａ、９ｂは、電動機１０への電流を検出し電流検出部
１５へ信号を出力する。又、電流検出抵抗７は、平滑コ
ンデンサ６からインバータ回路８間の電流を検出し、電
流検出部１３へ信号を出力する。電流検出部１３では、
平滑コンデンサ６からインバータ回路８へ流れ込む電流
のみ有効とし、その反対方向の電流は無視する。電圧検
出部１２は、平滑コンデンサ６の両端の電圧を検出す
る。Next, the operation will be described with reference to FIGS. When the conductor 17 is turned on, the voltage of the three-phase commercial power supply is applied to the diode module 3 and the three-phase full-wave rectification is performed. When a current flows through the smoothing capacitor 6 instead of the inrush prevention resistor 19 to be charged and smoothed to obtain a DC power source, the power relay 18 short-circuits the inrush limiting resistor 19. The inverter circuit 8 is DC-AC converted by the signal of the base drive unit 14 and supplies an AC current to the electric motor 10. DCCT for current detection
9a and 9b detect a current to the electric motor 10 and output a signal to the current detection unit 15. Further, the current detection resistor 7 detects a current between the smoothing capacitor 6 and the inverter circuit 8 and outputs a signal to the current detection unit 13. In the current detector 13,
Only the current flowing from the smoothing capacitor 6 to the inverter circuit 8 is valid, and the current in the opposite direction is ignored. The voltage detector 12 detects the voltage across the smoothing capacitor 6.
【０００４】次に地絡した場合の説明をする。図７にお
いて、三相電源が☆印の位相でコンタクタ１７がＯＮし
たとすると、先に説明した通りＡのルートで電流が流れ
るのと図中（ア）及び（イ）の位置で地絡した場合は、
Ｂのルートで地絡電流が流れる。Next, a case where a ground fault occurs will be described. In FIG. 7, assuming that the contactor 17 is turned on in the phase of the three-phase power supply with the star mark, the current flows through the route A as described above, and the ground fault occurs at the positions (A) and (B) in the figure. If
A ground fault current flows along route B.
【０００５】[0005]
【発明が解決しようとする課題】従来の制御装置は以上
のように構成されているので、図７の（ア）又は（イ）
の所で地絡していると、図８に示す様に突入電流以外に
地絡電流も流れてしまう。地絡電流については、その回
路にインピーダンスがほとんどない為、接地インピーダ
ンスに電流は左右されてしまい接地インピーダンスが小
さな場合は、保護機能がない為、部品を破損してしまう
などの問題点があった。Since the conventional control device is constructed as described above, it will be difficult to solve the problems.
If there is a ground fault at this point, a ground fault current will flow in addition to the inrush current as shown in FIG. Regarding the ground fault current, there is almost no impedance in the circuit, so the current is influenced by the ground impedance, and when the ground impedance is small, there is a problem that parts are damaged because there is no protection function. ..
【０００６】この発明は上記のような問題点を解決する
ためになされたもので、地絡検出をすることが出来る地
絡検出制御装置を得ることを目的とする。The present invention has been made to solve the above problems, and an object thereof is to obtain a ground fault detection control device capable of detecting a ground fault.
【０００７】[0007]
【課題を解決するための手段】この発明に係わる地絡検
出制御装置は、突入電流制限抵抗と、その両端に接続さ
れているパワーリレーを、全波整流された電圧とパラに
接続される平滑コンデンサと、シリーズに接続したもの
である。SUMMARY OF THE INVENTION A ground fault detection control device according to the present invention comprises a rush current limiting resistor and a power relay connected to both ends of the rush current limiting resistor, which is connected to a full-wave rectified voltage and a smoothing circuit. It is connected with a capacitor and series.
【０００８】[0008]
【作用】この発明における突入制限用抵抗と、その両端
に接続するパワーリレーをもうけることにより、突入電
流制限以外にも地絡電流を制限する様に働く。By providing the inrush limiting resistor and the power relays connected to both ends of the inrush limiting resistor according to the present invention, it functions to limit the ground fault current in addition to limiting the inrush current.
【０００９】[0009]
実施例１．この発明の一実施例を図１〜図３で説明す
る。図１において、１は三相商用電源、３は三相を全波
整流するダイオードモジュール、５は突入電流及び地絡
電流制限用抵抗、４は突入及び地絡電流制限抵抗の両端
を短絡するパワーリレー、６は平滑コンデンサ、８はＤ
Ｃ−ＡＣ変換するインバータ回路、７はインバータ回路
８を保護する為の電流検出抵抗、９ａ、９ｂは出力電流
検出用ＤＣＣＴ、１０は電動機、１１は制御部を動作さ
せる為の制御電源部、１２は平滑コンデンサ６の電圧を
検出する為の電圧検出部、１３はインバータ回路８へ流
れ込む電流を検出する電流検出部、１４はインバータ回
路８を駆動させるベース駆動部、１５は出力電流検出用
ＤＣＣＴ９ａ、９ｂの電流を検出する電流検出部、１６
は比較・判定部、１７は制御回路とパワー回路が分離出
来るコンタクタである。また、２０は比較判定部１６に
より制御され、コンタクタ２の１相の接点と並列に接点
が接続されているコンタクタである。Example 1. An embodiment of the present invention will be described with reference to FIGS. In FIG. 1, 1 is a three-phase commercial power supply, 3 is a diode module for full-wave rectifying three phases, 5 is a resistor for limiting inrush current and ground fault current, 4 is power for short-circuiting both ends of the inrush and ground fault current limiting resistor. Relay, 6 is smoothing capacitor, 8 is D
An inverter circuit for C-AC conversion, 7 is a current detection resistor for protecting the inverter circuit 8, 9a and 9b are output current detection DCCTs, 10 is an electric motor, 11 is a control power supply section for operating a control section, 12 Is a voltage detection unit for detecting the voltage of the smoothing capacitor 6, 13 is a current detection unit for detecting a current flowing into the inverter circuit 8, 14 is a base drive unit for driving the inverter circuit 8, 15 is an output current detection DCCT 9a, A current detector for detecting the current of 9b, 16
Is a comparison / determination unit, and 17 is a contactor capable of separating the control circuit and the power circuit. A contactor 20 is controlled by the comparison / determination unit 16 and has a contact connected in parallel with the one-phase contact of the contactor 2.
【００１０】次にこの発明を図１〜図３により説明す
る。コンタクタ１７がＯＮすると、三相商用電源１の電
圧がダイオードモジュール３にかかり三相全波整流され
る。突入及び地絡制御抵抗５をかえして平滑コンデンサ
６に電流が流れ充電され平滑しＤＣ電源を得ると、突入
及び地絡制限抵抗５をパワーリレー４は短絡する。イン
バータ回路８は、ベース駆動部１４の信号によりＤＣ−
ＡＣ変換され、電動機１０へＡＣ電源を流す。電流検出
用ＤＣＣＴ９ａ、９ｂは、電動機１０への電流を検出し
電源検出部１５へ信号を出力する。又、電流検出抵抗７
は、平滑コンデンサ６からインバータ回路８間の電流を
検出し、電流検出部１３へ信号を出力する。電流検出部
１３では、平滑コンデンサ６からインバータ回路８へ流
れ込む電流のみ有効とし、その反対方向の電流は無視す
る。電圧検出部には、平滑コンデンサ６の両端の電圧を
検出する。Next, the present invention will be described with reference to FIGS. When the contactor 17 is turned on, the voltage of the three-phase commercial power supply 1 is applied to the diode module 3 and three-phase full-wave rectification is performed. When the rush and ground fault control resistor 5 is replaced and a current flows through the smoothing capacitor 6 to be charged and smoothed to obtain a DC power source, the power relay 4 short-circuits the rush and ground fault limiting resistor 5. The inverter circuit 8 receives a DC-
AC conversion is performed, and AC power is supplied to the electric motor 10. The current detection DCCTs 9 a and 9 b detect the current to the electric motor 10 and output a signal to the power supply detection unit 15. Also, the current detection resistor 7
Detects the current between the smoothing capacitor 6 and the inverter circuit 8 and outputs a signal to the current detection unit 13. In the current detector 13, only the current flowing from the smoothing capacitor 6 into the inverter circuit 8 is valid, and the current in the opposite direction is ignored. The voltage detector detects the voltage across the smoothing capacitor 6.
【００１１】次に地絡の検出方法について説明する。図
１〜図３において三相電源１が入力されると制御電源部
１１が動作する。そして、コンタクタ１７をＯＮする前
にコンタクタ１７の１相の接点に並列に接点が接続され
たコンタクタ２０をＯＮするように比較判定部１６が指
令を出す。このとき、図２のア及びイの様に地絡してい
たとするとＡ及びＢのルートで地絡電流が流れる。しか
し、地絡電流は、突入及び地絡制限抵抗５により制限さ
れる。その地絡電流により平滑コンデンサ６が充電され
平滑コンデンサ６の端子間電圧が上昇する為電圧検出部
１２により地絡を検出することが可能となる。また、平
滑コンデンサ６が充電されなければ地絡が発生していな
いものと判定し、コンタクタ２０をＯＦＦし、次に、コ
ンタクタ１７をＯＮさせ通常運転に入る。また、突入地
絡制限抵抗５は比較的大きな地に設定することができる
ので、地絡検出時における地絡電流を小さくすることが
できる。Next, a method of detecting a ground fault will be described. When the three-phase power supply 1 is input in FIGS. 1 to 3, the control power supply unit 11 operates. Then, before turning on the contactor 17, the comparison / determination unit 16 issues a command to turn on the contactor 20 whose contact point is connected in parallel with the contact of the first phase of the contactor 17. At this time, if there is a ground fault as shown in A and B of FIG. 2, a ground fault current flows through routes A and B. However, the ground fault current is limited by the inrush and ground fault limiting resistor 5. The smoothing capacitor 6 is charged by the ground fault current and the voltage across the terminals of the smoothing capacitor 6 rises, so that the voltage detecting unit 12 can detect the ground fault. If the smoothing capacitor 6 is not charged, it is determined that the ground fault has not occurred, the contactor 20 is turned off, and then the contactor 17 is turned on to start normal operation. Further, since the inrush ground fault limiting resistor 5 can be set to a relatively large ground, the ground fault current at the time of detecting the ground fault can be reduced.
【００１２】実施例２．次に、この発明の他の実施例に
ついて、図４により説明する。図４は従来例を示す図６
において、３相のコンタクタ１７に代って２相のコンタ
クタ２を用い３相のうち１相は常時接続状態にするよう
にしたものである。コンタクタ２がＯＦＦしていても１
相は接続状態にあるので、地絡している場合は地絡電流
が流れ、地絡の検出が可能である。この場合、地絡電流
は電流検出抵抗７で検出される。そして、地絡していな
いと判定したときはコンタクタ２をＯＮし通常運転に入
る。Example 2. Next, another embodiment of the present invention will be described with reference to FIG. FIG. 4 shows a conventional example shown in FIG.
In the above, the two-phase contactor 2 is used in place of the three-phase contactor 17, and one of the three phases is always connected. 1 even if contactor 2 is off
Since the phases are connected, the ground fault current flows when there is a ground fault, and the ground fault can be detected. In this case, the ground fault current is detected by the current detection resistor 7. When it is determined that there is no ground fault, the contactor 2 is turned on and normal operation starts.
【００１３】実施例３．図５はこの発明のさらに他の実
施例による地絡検出制御装置の構成図である。図５は図
１に示すこの発明の一実施例による地絡検出装置におい
て、コンタクタ２０を用いずに常時１相を接続状態と
し、３相のコンタクタ１７に代って、２相のコンタクタ
２を用いるようにしたものである。図５に示す地絡検出
制御装置においては、コンタクタ２をＯＦＦしても３相
のうち１相は遮断されないが、その他については図１に
示す地絡検出制御装置と同様の効果がある。Embodiment 3. FIG. 5 is a block diagram of a ground fault detection control device according to still another embodiment of the present invention. FIG. 5 shows a ground fault detecting apparatus according to an embodiment of the present invention shown in FIG. 1, in which one phase is always connected without using the contactor 20 and the two phase contactor 2 is replaced with the three phase contactor 17. It is intended to be used. In the ground fault detection control device shown in FIG. 5, even if the contactor 2 is turned off, one of the three phases is not cut off, but other effects are the same as those of the ground fault detection control device shown in FIG.
【００１４】[0014]
【発明の効果】以上のように、この発明によれば、突入
制限抵抗５及びその両端にもうけたパワーリレー４の接
続位置を変更するだけで地絡電流が制限できるような回
路にしたので、装置のコストアップはなく、安全に地絡
検出が出来る効果がある。As described above, according to the present invention, the circuit is such that the ground fault current can be limited only by changing the connection positions of the inrush limiting resistor 5 and the power relay 4 provided at both ends thereof. The cost of the device does not increase, and there is an effect that the ground fault can be detected safely.
【図１】この発明の一実施例による地絡検出制御装置の
構成図である。FIG. 1 is a configuration diagram of a ground fault detection control device according to an embodiment of the present invention.
【図２】この発明の一実施例による地絡電流ルートを示
す図である。FIG. 2 is a diagram showing a ground fault current route according to an embodiment of the present invention.
【図３】この発明の地絡電流波形とコンデンサ電圧特性
図である。FIG. 3 is a ground fault current waveform and a capacitor voltage characteristic diagram of the present invention.
【図４】この発明は他の実施例による地絡検出制御装置
の構成図である。FIG. 4 is a configuration diagram of a ground fault detection control device according to another embodiment.
【図５】この発明のさらに他の実施例による地絡検出制
御装置の構成図である。FIG. 5 is a configuration diagram of a ground fault detection control device according to still another embodiment of the present invention.
【図６】従来の制御装置の構成図である。FIG. 6 is a configuration diagram of a conventional control device.
【図７】従来の制御装置の地絡電流ルートを示す図であ
る。FIG. 7 is a diagram showing a ground fault current route of a conventional control device.
【図８】従来の地絡・突入電流波形とコンデンサ電圧特
性図である。FIG. 8 is a conventional ground fault / inrush current waveform and a capacitor voltage characteristic diagram.
１ 三相商用電源 ２ コンタクタ ３ ダイオードモジュール ４ パワーリレー ５ 突入・地絡制御抵抗 ６ 平滑コンデンサ ７ 電力検出回路 ８ インバータ回路 ９ａ、９ｂ 電流検出用ＤＣＣＴ １０ 電動機 １１ 制御電源部 １２ 電圧検出部 １３ 電流検出部 １４ ベース駆動部 １５ 電流検出部 １６ 比較・判定部 １７ コンタクタ １８ パワーリレー １９ 突入制御抵抗 1 Three-Phase Commercial Power Supply 2 Contactor 3 Diode Module 4 Power Relay 5 Inrush / Ground Fault Control Resistor 6 Smoothing Capacitor 7 Power Detection Circuit 8 Inverter Circuit 9a, 9b Current Detection DCCT 10 Electric Motor 11 Control Power Supply Section 12 Voltage Detection Section 13 Current Detection Part 14 base drive part 15 current detection part 16 comparison / judgment part 17 contactor 18 power relay 19 inrush control resistance
Claims (1)
れを平滑し電動機を駆動するインバータ部からなる制御
装置において、商用電源を整流した電圧を平滑するコン
デンサと、シリーズに抵抗を、またその抵抗と並列に接
点を備えた地絡検出制御装置。1. A control device comprising a converter section for rectifying a commercial power source and an inverter section for smoothing the commercial power source to drive an electric motor, a capacitor for smoothing a voltage obtained by rectifying the commercial power source, a resistor in series, and a resistor for the resistor. A ground fault detection control device that has contacts in parallel with it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2967392A JPH05223906A (en) | 1992-02-17 | 1992-02-17 | Ground fault detection controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2967392A JPH05223906A (en) | 1992-02-17 | 1992-02-17 | Ground fault detection controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05223906A true JPH05223906A (en) | 1993-09-03 |
Family
ID=12282635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2967392A Pending JPH05223906A (en) | 1992-02-17 | 1992-02-17 | Ground fault detection controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05223906A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0707367A1 (en) * | 1994-10-11 | 1996-04-17 | Kabushiki Kaisha Toshiba | Ground fault detecting apparatus and method for detecting ground fault of field circuit and exciting circuit by detecting ground fault current flowing from ground to neutral point of exciting circuit |
| JP2002078353A (en) * | 2000-08-24 | 2002-03-15 | Mitsubishi Electric Engineering Co Ltd | Inverter device for crane |
| WO2005059580A1 (en) * | 2003-12-17 | 2005-06-30 | Siemens Aktiengesellschaft | Method and assembly for testing a power output stage |
| JP2005201669A (en) * | 2004-01-13 | 2005-07-28 | Fanuc Ltd | Motor drive apparatus |
| JP2006158065A (en) * | 2004-11-29 | 2006-06-15 | Mitsubishi Electric Corp | Inverter device |
| WO2007102503A1 (en) * | 2006-03-09 | 2007-09-13 | Daikin Industries, Ltd. | Earth-fault detecting method |
| WO2007108296A1 (en) * | 2006-03-16 | 2007-09-27 | Daikin Industries, Ltd. | Multiphase load control method |
| FR2943474A1 (en) * | 2009-03-17 | 2010-09-24 | Schneider Toshiba Inverter | Power converter for variable speed drive, has normally open type auxiliary switch positioned in series with each switching arm and connected on negative line of power supply bus, and control device controlling each auxiliary switch |
| KR101241011B1 (en) * | 2011-06-13 | 2013-03-11 | 현대자동차주식회사 | Inverter circuit for reducing inrush current and method for controlling the same |
| CN104660021A (en) * | 2013-11-19 | 2015-05-27 | Ls产电株式会社 | Pre-charging circuit of inverter |
-
1992
- 1992-02-17 JP JP2967392A patent/JPH05223906A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0707367A1 (en) * | 1994-10-11 | 1996-04-17 | Kabushiki Kaisha Toshiba | Ground fault detecting apparatus and method for detecting ground fault of field circuit and exciting circuit by detecting ground fault current flowing from ground to neutral point of exciting circuit |
| US5691643A (en) * | 1994-10-11 | 1997-11-25 | Kabushiki Kaisha Toshiba | Ground fault detecting apparatus and method for detecting ground fault of field circuit and exciting circuit by detecting ground fault current flowing from ground to neutral point of exciting circuit |
| JP2002078353A (en) * | 2000-08-24 | 2002-03-15 | Mitsubishi Electric Engineering Co Ltd | Inverter device for crane |
| WO2005059580A1 (en) * | 2003-12-17 | 2005-06-30 | Siemens Aktiengesellschaft | Method and assembly for testing a power output stage |
| JP2005201669A (en) * | 2004-01-13 | 2005-07-28 | Fanuc Ltd | Motor drive apparatus |
| JP2006158065A (en) * | 2004-11-29 | 2006-06-15 | Mitsubishi Electric Corp | Inverter device |
| WO2007102503A1 (en) * | 2006-03-09 | 2007-09-13 | Daikin Industries, Ltd. | Earth-fault detecting method |
| EP1995870A4 (en) * | 2006-03-09 | 2017-09-27 | Daikin Industries, Ltd. | Earth-fault detecting method |
| EP1995862A4 (en) * | 2006-03-16 | 2015-06-03 | Daikin Ind Ltd | Multiphase load control method |
| WO2007108296A1 (en) * | 2006-03-16 | 2007-09-27 | Daikin Industries, Ltd. | Multiphase load control method |
| FR2943474A1 (en) * | 2009-03-17 | 2010-09-24 | Schneider Toshiba Inverter | Power converter for variable speed drive, has normally open type auxiliary switch positioned in series with each switching arm and connected on negative line of power supply bus, and control device controlling each auxiliary switch |
| KR101241011B1 (en) * | 2011-06-13 | 2013-03-11 | 현대자동차주식회사 | Inverter circuit for reducing inrush current and method for controlling the same |
| CN104660021A (en) * | 2013-11-19 | 2015-05-27 | Ls产电株式会社 | Pre-charging circuit of inverter |
| JP2015100261A (en) * | 2013-11-19 | 2015-05-28 | エルエス産電株式会社Ｌｓｉｓ Ｃｏ．，Ｌｔｄ． | Pre-charging circuit of inverter |
| CN104660021B (en) * | 2013-11-19 | 2017-04-05 | Ls产电株式会社 | The pre-charge circuit of inverter |
| US9991814B2 (en) | 2013-11-19 | 2018-06-05 | Lsis Co., Ltd. | Pre-charging circuit of inverter |
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