JPH09233854A - Pwm inverter apparatus - Google Patents
Pwm inverter apparatusInfo
- Publication number
- JPH09233854A JPH09233854A JP8035983A JP3598396A JPH09233854A JP H09233854 A JPH09233854 A JP H09233854A JP 8035983 A JP8035983 A JP 8035983A JP 3598396 A JP3598396 A JP 3598396A JP H09233854 A JPH09233854 A JP H09233854A
- Authority
- JP
- Japan
- Prior art keywords
- pwm inverter
- compensation transformer
- voltage
- common mode
- primary winding
- 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
Abstract
Description
【発明の属する技術分野】この発明は、例えば単相出力
または３相出力の定電圧定周波（ＣＶＣＦ）電源装置な
どに使用されるＰＷＭインバータ装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PWM inverter device used in, for example, a constant voltage constant frequency (CVCF) power supply device having a single-phase output or a three-phase output.
【従来の技術】図５は、この種のＰＷＭインバータ装置
の従来例を示す回路構成図である。図５において、１は
商用電源などの交流電源であり、図示の如く電源設備の
保安上の理由等から一線が接地されている、２はダイオ
ード整流器、３は平滑用コンデンサおよびＩＧＢＴとダ
イオードとを逆並列接続したものをブリッジ接続したＰ
ＷＭインバータ、４はＰＷＭインバータ３の出力の波形
を正弦波化するリアクトル及びコンデンサからなるＬＣ
フィルタ、５は負荷機器の等価抵抗５ａおよび該負荷機
器の配線用ケーブルの対地容量と該負荷機器の接地コン
デンサとを包含した接地コンデンサ５ｂからなる負荷設
備である。図５に示したＰＷＭインバータ装置におい
て、ＰＷＭインバータ３のＰＷＭ制御に基づくスイッチ
ング動作によりＰＷＭインバータ３の出力の交流中性点
の対地電位が変動し、この電位変動により接地コンデン
サ５ｂに交流電源１の接地線を介して流れる高周波漏洩
電流が過大になる恐れがあり、この高周波漏洩電流を抑
制する必要があるときには、図示のコモンモードリアク
トル６をＬＣフィルタ４と負荷設備５との間に挿入して
いる。2. Description of the Related Art FIG. 5 is a circuit diagram showing a conventional example of a PWM inverter device of this type. In FIG. 5, 1 is an AC power supply such as a commercial power supply, and one line is grounded for the reason of security of power supply equipment as shown in the drawing, 2 is a diode rectifier, 3 is a smoothing capacitor, and an IGBT and a diode. Bridged connection of reverse parallel connection P
The WM inverter 4 is an LC that is composed of a reactor and a capacitor for converting the output waveform of the PWM inverter 3 into a sine wave.
The filter 5 is a load facility including an equivalent resistance 5a of the load device and a ground capacitor 5b including a ground capacitance of the wiring cable of the load device and a ground capacitor of the load device. In the PWM inverter device shown in FIG. 5, the grounding potential of the AC neutral point of the output of the PWM inverter 3 varies due to the switching operation based on the PWM control of the PWM inverter 3, and this potential variation causes the grounding capacitor 5b of the AC power source 1 to operate. The high frequency leakage current flowing through the ground wire may become excessive, and when it is necessary to suppress this high frequency leakage current, the illustrated common mode reactor 6 is inserted between the LC filter 4 and the load equipment 5. There is.
【発明が解決しようとする課題】上述の従来の高周波漏
洩電流の抑制方法では、ＰＷＭインバータ装置の定格出
力電流に対応したコモンモードリアクトルを必要とし、
その結果、該コモンモードリアクトルが大型化し、価格
的にも問題があった。この発明の目的は、上記問題点を
解決するＰＷＭインバータ装置を提供することにある。The above-mentioned conventional method of suppressing high frequency leakage current requires a common mode reactor corresponding to the rated output current of the PWM inverter device,
As a result, the common mode reactor becomes large and there is a problem in terms of price. An object of the present invention is to provide a PWM inverter device that solves the above problems.
【課題を解決するための手段】この第１の発明は、交流
電源の電圧を整流器により直流電圧に変換し、この直流
電圧をＰＷＭインバータにより所望の交流電圧に変換
し、この交流電圧をＬＣフィルタを介して負荷に供給す
るＰＷＭインバータ装置において、前記ＰＷＭインバー
タ装置に、直流コモンモードリアクトルと補償変圧器と
複数個の交流側コンデンサと複数個の直流側コンデンサ
とを備え、整流器の出力端子とＰＷＭインバータの入力
端子との間に前記直流コモンモードリアクトルを接続
し、前記補償変圧器の一次巻線の一端と、該一次巻線の
一端とは異なる極性の該補償変圧器の二次巻線の一端と
をそれぞれ接地し、前記ＰＷＭインバータの出力端子そ
れぞれと前記補償変圧器の一次巻線の他端との間に前記
交流側コンデンサをそれぞれ接続し、前記直流コモンモ
ードリアクトルの前記ＰＷＭインバータ側のそれぞれの
端子と前記補償変圧器の二次巻線の他端との間に前記直
流側コンデンサをそれぞれ接続する。また第２の発明は
前記ＰＷＭインバータ装置において、前記ＰＷＭインバ
ータ装置に、直流コモンモードリアクトルと補償変圧器
と制動抵抗と複数個の交流側コンデンサと複数個の直流
側コンデンサとを備え、整流器の出力端子とＰＷＭイン
バータの入力端子との間に前記直流コモンモードリアク
トルを接続し、前記補償変圧器の一次巻線の一端と、該
一次巻線の一端とは異なる極性の該補償変圧器の二次巻
線の一端とをそれぞれ接地し、前記ＰＷＭインバータの
出力端子それぞれと前記補償変圧器の一次巻線の他端と
の間に前記交流側コンデンサをそれぞれ接続し、前記直
流コモンモードリアクトルの前記ＰＷＭインバータ側の
それぞれの端子と前記制動抵抗の一端との間に前記直流
側コンデンサをそれぞれ接続し、前記制動抵抗の他端と
前記補償変圧器の二次巻線の他端とを接続する。この発
明によれば、ＰＷＭ制御に基づくスイッチング動作によ
りＰＷＭインバータの出力の交流中性点の対地電位変動
分は前記交流側コンデンサと直流側コンデンサと補償変
圧器を備えることにより、該補償変圧器の一次巻線と二
次巻線との直列接続したものに架かり、その結果、前記
対地電位変動分は分圧されて前記負荷設備の接地コンデ
ンサに架かるので、この高周波漏洩電流が低減する。ま
た第２の発明は上記作用に加えて、前記制動抵抗を付加
することにより前記高周波漏洩電流の振動現象を抑制さ
せる。According to the first aspect of the present invention, a rectifier converts a voltage of an AC power supply into a DC voltage, a PWM inverter converts the DC voltage into a desired AC voltage, and the AC voltage is an LC filter. In a PWM inverter device that supplies a load to a load via a PWM inverter device, the PWM inverter device includes a DC common mode reactor, a compensation transformer, a plurality of AC side capacitors, and a plurality of DC side capacitors, and an output terminal of the rectifier and a PWM. The DC common mode reactor is connected between the input terminal of the inverter and one end of the primary winding of the compensation transformer, and one end of the primary winding of the secondary winding of the compensation transformer having a different polarity. One end of each is grounded, and the AC side capacitor is connected between each output terminal of the PWM inverter and the other end of the primary winding of the compensation transformer. Each connected, respectively connecting the DC side capacitor between the other end of the PWM inverter side of each terminal and the compensation transformer secondary winding of the DC common mode reactors. According to a second aspect of the present invention, in the PWM inverter device, the PWM inverter device includes a DC common mode reactor, a compensation transformer, a braking resistor, a plurality of AC side capacitors, and a plurality of DC side capacitors, and the output of the rectifier is provided. The DC common mode reactor is connected between the terminal and the input terminal of the PWM inverter, and one end of the primary winding of the compensation transformer and the secondary of the compensation transformer having a polarity different from that of the one end of the primary winding. One end of each winding is grounded, and each of the AC side capacitors is connected between each output terminal of the PWM inverter and the other end of the primary winding of the compensation transformer, and the PWM of the DC common mode reactor is connected. The DC-side capacitors are respectively connected between the terminals on the inverter side and one end of the braking resistor, and the other end of the braking resistor is connected. Connecting the other end of the serial compensator transformer secondary winding. According to the present invention, by the switching operation based on the PWM control, the variation of the ground potential at the AC neutral point of the output of the PWM inverter is provided with the AC side capacitor, the DC side capacitor, and the compensation transformer. This high-frequency leakage current is reduced because the primary winding and the secondary winding are connected in series, and as a result, the ground potential fluctuation is divided and applied to the grounding capacitor of the load facility. In addition to the above operation, the second invention suppresses the vibration phenomenon of the high frequency leakage current by adding the braking resistance.
【発明の実施の形態】図１は、この発明の第１の実施例
を示すＰＷＭインバータ装置の回路構成図であり、図５
に示した従来例と同一機能を有するものには同一符号を
付してその説明を省略する。すなわち図１において、こ
の発明のＰＷＭインバータ装置には、直流コモンモード
リアクトル１１と補償変圧器１２と複数個の交流側コン
デンサ１３と複数個の直流側コンデンサ１４とを備え、
ダイオード整流器２の出力端子とＰＷＭインバータ３の
入力端子との間に直流コモンモードリアクトル１１を図
示の如く接続し、補償変圧器１２の一次巻線の一端と、
該一次巻線の一端とは異なる極性の補償変圧器１２の二
次巻線の一端とをそれぞれ接地し、ＰＷＭインバータ３
の出力端子それぞれと補償変圧器１２の一次巻線の他端
との間に交流側コンデンサ１３（１３ａ，１３ｂ）を図
示の如く接続し、直流コモンモードリアクトル１１のＰ
ＷＭインバータ３側のそれぞれの端子と補償変圧器１２
の二次巻線の他端との間に直流側コンデンサ１４（１４
ａ，１４ｂ）を図示の如く接続している。図２は、図１
に示したこの発明の第１の実施例のＰＷＭインバータ３
のＰＷＭ制御に基づくスイッチング動作によりＰＷＭイ
ンバータ３の出力の交流中性点の対地電位変動分Ｖｉに
対する近似等価回路を示している。図２（イ）におい
て、ＬC は直流コモンモードリアクトル１１、ＴC は補
償変圧器１２、ＬF はＬＣフィルタ４のリアクトル成
分、ＲF はＬＣフィルタ４の抵抗成分、Ｃは接地コンデ
ンサ５ｂを示している。図２（ロ）は図２（イ）の近似
等価回路を変形して表した回路図で、符号Ｃで示す接地
コンデンサ５ｂに流れる高周波漏洩電流は、対地電位変
動分Ｖｉを符号ＴC で示す補償変圧器１２により分圧さ
れた分となり、低減されることになる。図３は、この発
明の第２の実施例を示すＰＷＭインバータ装置の回路構
成図であり、図１に示したこの発明の第１の実施例と同
一機能を有するものには同一符号を付している。すなわ
ち図３において、この発明のＰＷＭインバータ装置に
は、直流コモンモードリアクトル１１と補償変圧器１２
と複数個の交流側コンデンサ１３と複数個の直流側コン
デンサ１４と制動抵抗１５とを備え、ダイオード整流器
２の出力端子とＰＷＭインバータ３の入力端子との間に
直流コモンモードリアクトル１１を図示の如く接続し、
補償変圧器１２の一次巻線の一端と、該一次巻線の一端
とは異なる極性の補償変圧器１１の二次巻線の一端とを
それぞれ接地し、ＰＷＭインバータ３の出力端子それぞ
れと補償変圧器１２の一次巻線の他端との間に交流側コ
ンデンサ１３（１３ａ，１３ｂ）を図示の如く接続し、
直流コモンモードリアクトル１１のＰＷＭインバータ３
側のそれぞれの端子と制動抵抗１５の一端との間に直流
側コンデンサ１４（１４ａ，１４ｂ）を図１の如く接続
し、制動抵抗１５の他端と補償変圧器１２の二次巻線の
他端とを接続している。図４は、図３に示したこの発明
の第２の実施例のＰＷＭインバータ３のＰＷＭ制御に基
づくスイッチング動作によりＰＷＭインバータ３の出力
の交流中性点の対地電位変動分Ｖｉに対する近似等価回
路を示し、図２と同一機能のものには同一符号を付して
いる。すなわち図４（イ）においてＲD は制動抵抗１５
を示し、図４（ロ）は図４（イ）の近似等価回路を変形
して表した回路図であり、前記符号ＴC ，ＬC ，ＬF，
ＲF ，Ｃで構成される閉回路の該ＲF の値が小さいとこ
の閉回路の制動係数も小さくなり、その結果、回路共振
を起こして符号Ｃで示す接地コンデンサ５ｂに流れる高
周波漏洩電流を低減できない場合には、符号ＲD で示す
制動抵抗を挿入し、上述の回路共振を起こさない値に選
定する。なお、図１，図３のこの発明の実施例において
は、ＰＷＭインバータ装置は単相出力の例で示したが、
ＰＷＭインバータ装置が３相出力の場合にもこの発明は
適用可能であり、このときには、交流側コンデンサを３
個にしてＰＷＭインバータの出力端子それぞれに接続す
ればよい。1 is a circuit configuration diagram of a PWM inverter device showing a first embodiment of the present invention, and FIG.
1 having the same functions as those of the conventional example shown in FIG. That is, referring to FIG. 1, the PWM inverter device of the present invention includes a DC common mode reactor 11, a compensation transformer 12, a plurality of AC side capacitors 13, and a plurality of DC side capacitors 14,
A DC common mode reactor 11 is connected between the output terminal of the diode rectifier 2 and the input terminal of the PWM inverter 3 as shown in the drawing, and one end of the primary winding of the compensation transformer 12 is connected,
One end of the primary winding and one end of the secondary winding of the compensation transformer 12 having a polarity different from each other are grounded respectively, and the PWM inverter 3
AC side capacitors 13 (13a, 13b) are connected as shown between the output terminals of the DC voltage converter and the other end of the primary winding of the compensation transformer 12, and the P of the DC common mode reactor 11 is connected.
Each terminal of the WM inverter 3 side and the compensation transformer 12
DC side capacitor 14 (14
a, 14b) are connected as shown. FIG. 2 shows FIG.
The PWM inverter 3 of the first embodiment of the present invention shown in FIG.
2 shows an approximate equivalent circuit for the ground potential fluctuation Vi at the AC neutral point of the output of the PWM inverter 3 by the switching operation based on the PWM control of FIG. In FIG. 2A, L C is a DC common mode reactor 11, T C is a compensation transformer 12, L F is a reactor component of the LC filter 4, R F is a resistance component of the LC filter 4, and C is a ground capacitor 5b. Shows. FIG. 2B is a circuit diagram obtained by transforming the approximate equivalent circuit of FIG. 2A, and the high-frequency leakage current flowing through the grounding capacitor 5b indicated by the reference symbol C indicates the ground potential fluctuation Vi by the reference symbol T C. The voltage is divided by the compensation transformer 12, and is reduced. FIG. 3 is a circuit configuration diagram of a PWM inverter device showing a second embodiment of the present invention, and those having the same functions as those of the first embodiment of the present invention shown in FIG. ing. That is, referring to FIG. 3, in the PWM inverter device of the present invention, a DC common mode reactor 11 and a compensation transformer 12 are provided.
And a plurality of AC side capacitors 13, a plurality of DC side capacitors 14 and a braking resistor 15, and a DC common mode reactor 11 between the output terminal of the diode rectifier 2 and the input terminal of the PWM inverter 3 as shown in the figure. connection,
One end of the primary winding of the compensating transformer 12 and one end of the secondary winding of the compensating transformer 11 having a polarity different from that of the primary winding are respectively grounded, and each of the output terminals of the PWM inverter 3 and the compensating transformer is grounded. AC side capacitor 13 (13a, 13b) is connected as shown between the other end of the primary winding of the container 12,
PWM inverter 3 of DC common mode reactor 11
The DC side capacitors 14 (14a, 14b) are connected between each terminal on one side and one end of the braking resistor 15 as shown in FIG. 1, and the other end of the braking resistor 15 and the secondary winding of the compensation transformer 12 are connected. It connects to the end. FIG. 4 shows an approximate equivalent circuit to the ground potential fluctuation Vi at the AC neutral point of the output of the PWM inverter 3 by the switching operation based on the PWM control of the PWM inverter 3 of the second embodiment of the present invention shown in FIG. 2, the same functions as those in FIG. 2 are designated by the same reference numerals. That is, in FIG. 4A, R D is the braking resistance 15
FIG. 4B is a circuit diagram obtained by transforming the approximate equivalent circuit of FIG. 4A, and the reference symbols T C , L C , L F ,
When the value of R F of the closed circuit composed of R F and C is small, the damping coefficient of this closed circuit also becomes small, and as a result, the high frequency leakage current flowing in the ground capacitor 5b indicated by the symbol C is caused due to circuit resonance. If it cannot be reduced, a braking resistor indicated by reference symbol R D is inserted to select a value that does not cause the above-mentioned circuit resonance. In the embodiments of the present invention shown in FIGS. 1 and 3, the PWM inverter device is shown as an example of single-phase output.
The present invention is also applicable to the case where the PWM inverter device has a three-phase output.
It is sufficient to connect them to the output terminals of the PWM inverter individually.
【発明の効果】この発明によれば、ＰＷＭインバータ装
置の負荷設備の接地コンデンサに流れる高周波漏洩電流
の抑制方法として、従来のＰＷＭインバータ装置の定格
電流に耐える大型のコモンモードリアクトルに比して小
型にできる直流コモンモードリアクトルと高周波漏洩電
流のみ電流耐量の補償変圧器などから構成できるので、
小型，安価にその機能が発揮される。According to the present invention, as a method of suppressing the high frequency leakage current flowing in the ground capacitor of the load equipment of the PWM inverter device, it is smaller than the large-sized common mode reactor which can withstand the rated current of the conventional PWM inverter device. Since it can be configured from a DC common mode reactor that can be
Its function is small and inexpensive.
【図１】この発明の第１の実施例を示すＰＷＭインバー
タ装置の回路構成図FIG. 1 is a circuit configuration diagram of a PWM inverter device showing a first embodiment of the present invention.
【図２】図１の動作を説明する回路図FIG. 2 is a circuit diagram illustrating the operation of FIG.
【図３】この発明の第２の実施例を示すＰＷＭインバー
タ装置の回路構成図FIG. 3 is a circuit configuration diagram of a PWM inverter device showing a second embodiment of the present invention.
【図４】図３の動作を説明する回路図FIG. 4 is a circuit diagram illustrating the operation of FIG.
【図５】従来例を示すＰＷＭインバータ装置の回路構成
図FIG. 5 is a circuit configuration diagram of a PWM inverter device showing a conventional example.
１ 交流電源 ２ ダイオード整流器 ３ ＰＷＭインバータ ４ ＬＣフィルタ ５ 負荷設備 ５ｂ 接地コンデンサ ６ コモンモードリアクトル １１ 直流コモンモードリアクトル １２ 補償変圧器 １３ 交流側コンデンサ １４ 直流側コンデンサ １５ 制動抵抗 1 AC Power Supply 2 Diode Rectifier 3 PWM Inverter 4 LC Filter 5 Load Facility 5b Grounding Capacitor 6 Common Mode Reactor 11 DC Common Mode Reactor 12 Compensation Transformer 13 AC Side Capacitor 14 DC Side Capacitor 15 Braking Resistance
Claims (2)
変換し、この直流電圧をＰＷＭインバータにより所望の
交流電圧に変換し、この交流電圧をＬＣフィルタを介し
て負荷に供給するＰＷＭインバータ装置において、 前記ＰＷＭインバータ装置に、直流コモンモードリアク
トルと補償変圧器と複数個の交流側コンデンサと複数個
の直流側コンデンサとを備え、 整流器の出力端子とＰＷＭインバータの入力端子との間
に前記直流コモンモードリアクトルを接続し、 前記補償変圧器の一次巻線の一端と、該一次巻線の一端
とは異なる極性の該補償変圧器の二次巻線の一端とをそ
れぞれ接地し、 前記ＰＷＭインバータの出力端子それぞれと前記補償変
圧器の一次巻線の他端との間に前記交流側コンデンサを
それぞれ接続し、 前記直流コモンモードリアクトルの前記ＰＷＭインバー
タ側のそれぞれの端子と前記補償変圧器の二次巻線の他
端との間に前記直流側コンデンサをそれぞれ接続したこ
とを特徴とするＰＷＭインバータ装置。1. A PWM inverter device in which a voltage of an AC power source is converted into a DC voltage by a rectifier, the DC voltage is converted into a desired AC voltage by a PWM inverter, and the AC voltage is supplied to a load through an LC filter. The PWM inverter device includes a DC common mode reactor, a compensation transformer, a plurality of AC side capacitors and a plurality of DC side capacitors, and the DC common mode is provided between an output terminal of the rectifier and an input terminal of the PWM inverter. A mode reactor is connected, and one end of the primary winding of the compensation transformer and one end of a secondary winding of the compensation transformer having a polarity different from that of the primary winding are grounded, and the PWM inverter The AC side capacitors are respectively connected between the output terminals and the other end of the primary winding of the compensation transformer, and the DC common mode PWM inverter apparatus characterized by connecting each said DC side capacitor between each terminal of the PWM inverter side de reactor and the other end of the compensation transformer secondary winding.
変換し、この直流電圧をＰＷＭインバータにより所望の
交流電圧に変換し、この交流電圧をＬＣフィルタを介し
て負荷に供給するＰＷＭインバータ装置において、 前記ＰＷＭインバータ装置に、直流コモンモードリアク
トルと補償変圧器と制動抵抗と複数個の交流側コンデン
サと複数個の直流側コンデンサとを備え、 整流器の出力端子とＰＷＭインバータの入力端子との間
に前記直流コモンモードリアクトルを接続し、 前記補償変圧器の一次巻線の一端と、該一次巻線の一端
とは異なる極性の該補償変圧器の二次巻線の一端とをそ
れぞれ接地し、 前記ＰＷＭインバータの出力端子それぞれと前記補償変
圧器の一次巻線の他端との間に前記交流側コンデンサを
それぞれ接続し、 前記直流コモンモードリアクトルの前記ＰＷＭインバー
タ側のそれぞれの端子と前記制動抵抗の一端との間に前
記直流側コンデンサをそれぞれ接続し、 前記制動抵抗の他端と前記補償変圧器の二次巻線の他端
とを接続したことを特徴とするＰＷＭインバータ装置。2. A PWM inverter device in which a voltage of an AC power supply is converted into a DC voltage by a rectifier, the DC voltage is converted into a desired AC voltage by a PWM inverter, and the AC voltage is supplied to a load through an LC filter. The PWM inverter device includes a DC common mode reactor, a compensating transformer, a braking resistor, a plurality of AC side capacitors, and a plurality of DC side capacitors, and between the output terminal of the rectifier and the input terminal of the PWM inverter. The DC common mode reactor is connected, and one end of the primary winding of the compensation transformer and one end of a secondary winding of the compensation transformer having a polarity different from that of the primary winding are grounded, The AC side capacitors are respectively connected between the output terminals of the PWM inverter and the other end of the primary winding of the compensation transformer, The DC side capacitors are respectively connected between respective terminals of the PWM inverter side of the common mode reactor and one end of the braking resistor, and the other end of the braking resistor and the other end of the secondary winding of the compensation transformer. A PWM inverter device characterized in that and are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8035983A JPH09233854A (en) | 1996-02-23 | 1996-02-23 | Pwm inverter apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8035983A JPH09233854A (en) | 1996-02-23 | 1996-02-23 | Pwm inverter apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09233854A true JPH09233854A (en) | 1997-09-05 |
Family
ID=12457119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8035983A Pending JPH09233854A (en) | 1996-02-23 | 1996-02-23 | Pwm inverter apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09233854A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002058253A (en) * | 2000-08-08 | 2002-02-22 | Sawafuji Electric Co Ltd | Inverter device |
| WO2002037908A3 (en) * | 2000-11-06 | 2004-02-26 | Ballard Power Systems | Active ground current reduction device |
| KR100607038B1 (en) * | 2004-08-25 | 2006-08-01 | 학교법인 울산공업학원 | Apparatus and method for damping resonant voltage on the LC filter of PWM inverter |
| KR100665059B1 (en) * | 2004-12-01 | 2007-01-09 | 삼성전자주식회사 | Driving apparatus for a motor |
| JP2009148162A (en) * | 2009-03-30 | 2009-07-02 | Toshiba Corp | Noise filter |
| JP2011147252A (en) * | 2010-01-14 | 2011-07-28 | Mitsubishi Electric Corp | Uninterruptible power supply apparatus |
| JP2012161193A (en) * | 2011-02-01 | 2012-08-23 | Murata Mach Ltd | Non-contact power supply device |
| WO2020070864A1 (en) * | 2018-10-04 | 2020-04-09 | 三菱電機株式会社 | Power supply device and magnetic resonance imaging apparatus |
-
1996
- 1996-02-23 JP JP8035983A patent/JPH09233854A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002058253A (en) * | 2000-08-08 | 2002-02-22 | Sawafuji Electric Co Ltd | Inverter device |
| WO2002037908A3 (en) * | 2000-11-06 | 2004-02-26 | Ballard Power Systems | Active ground current reduction device |
| KR100607038B1 (en) * | 2004-08-25 | 2006-08-01 | 학교법인 울산공업학원 | Apparatus and method for damping resonant voltage on the LC filter of PWM inverter |
| KR100665059B1 (en) * | 2004-12-01 | 2007-01-09 | 삼성전자주식회사 | Driving apparatus for a motor |
| JP2009148162A (en) * | 2009-03-30 | 2009-07-02 | Toshiba Corp | Noise filter |
| JP2011147252A (en) * | 2010-01-14 | 2011-07-28 | Mitsubishi Electric Corp | Uninterruptible power supply apparatus |
| JP2012161193A (en) * | 2011-02-01 | 2012-08-23 | Murata Mach Ltd | Non-contact power supply device |
| WO2020070864A1 (en) * | 2018-10-04 | 2020-04-09 | 三菱電機株式会社 | Power supply device and magnetic resonance imaging apparatus |
| JPWO2020070864A1 (en) * | 2018-10-04 | 2021-04-08 | 三菱電機株式会社 | Power supply and magnetic resonance imaging device |
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