JP2738138B2 - Control method of current source PWM converter - Google Patents
Control method of current source PWM converterInfo
- Publication number
- JP2738138B2 JP2738138B2 JP22244090A JP22244090A JP2738138B2 JP 2738138 B2 JP2738138 B2 JP 2738138B2 JP 22244090 A JP22244090 A JP 22244090A JP 22244090 A JP22244090 A JP 22244090A JP 2738138 B2 JP2738138 B2 JP 2738138B2
- Authority
- JP
- Japan
- Prior art keywords
- commutation
- pwm
- signal
- converter
- current
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、電流形PWMコンバータの制御方法に関す
る。Description: TECHNICAL FIELD The present invention relates to a control method of a current source PWM converter.
電流形PWMコンバータは例えば第３図に示すように、
３相純ブリッジのコンバータ３の出力側に電流を平滑す
るためのリアクトル４を設けて構成され、入力側にはコ
ンバータの高調波電流を吸収するためのリアクトル1,コ
ンデンサ２からなるフィルタ回路が設けられている。ま
た、コンバータ３のスイッチ素子として、ここではパワ
ートランジスタとダイオードとを直列に接続したものを
用いた例を示している。A current-source PWM converter is, for example, as shown in FIG.
The output side of the three-phase pure bridge converter 3 is provided with a reactor 4 for smoothing the current, and the input side is provided with a filter circuit comprising a reactor 1 and a capacitor 2 for absorbing the harmonic current of the converter. Have been. Also, here, an example in which a power transistor and a diode are connected in series is used as the switch element of the converter 3.
PWMコンバータ３を構成するスイッチ素子への信号
は、同期検出回路５により電源と同期をとり、PWM発生
回路６を介して出力される。その結果、電源と同期した
PWM信号により、PWMコンバータの入力電流は直流平滑電
流IdをPWM信号で裁断した電流となる。この電流は高調
波を多く含んでいるが、これは入力側のLCフィルタによ
って波形成形され、電源電流としては高調波成分の少な
いものとなっている。A signal to a switch element constituting the PWM converter 3 is synchronized with a power supply by a synchronization detection circuit 5 and output through a PWM generation circuit 6. As a result,
With the PWM signal, the input current of the PWM converter becomes a current obtained by cutting the DC smoothing current Id by the PWM signal. Although this current contains many harmonics, the waveform is shaped by the LC filter on the input side, and the power supply current has a small harmonic component.
第４図は第３図の動作を説明するための波形図であ
る。FIG. 4 is a waveform chart for explaining the operation of FIG.
同図（イ）は変調波となるキャリア信号CAと被変調波
となる制御信号COとを示し、同図（ロ）はPWMコンバー
タの各スイッチ素子に与えられるベース信号を示し、同
図（ハ）は或る相（Ｕ）のPWM電流波形を示している。FIG. 2A shows a carrier signal CA as a modulated wave and a control signal CO as a modulated wave, and FIG. 2B shows a base signal supplied to each switch element of the PWM converter. ) Shows a PWM current waveform of a certain phase (U).
PWMコンバータではスイッチ素子に自己消弧形素子を
用い、電源電圧の極性とは無関係に転流が行なえること
で、PWM化するようにしている。しかし、素子自体の特
性としてはパワートランジスタとダイオードとが直列に
なっており、転流時の電圧極性により、従来のサイリス
タコンバータのように、ダイオードの逆阻止による転流
と自己消弧素子であるパワートランジスタのしゃ断によ
る転流の２つのモードが生じる。In a PWM converter, a self-extinguishing element is used as a switch element, and commutation can be performed irrespective of the polarity of a power supply voltage, so that PWM is performed. However, as a characteristic of the element itself, the power transistor and the diode are in series, and due to the voltage polarity at the time of commutation, as in the conventional thyristor converter, it is a commutation due to reverse blocking of the diode and a self-extinguishing element. Two modes of commutation occur due to the interruption of the power transistor.
第５図はこのときの例を示しており、素子Ｕ→素子Ｗ
への転流状態を示す。Ｕ→Ｗへの転流では、コンバータ
の入力電圧vuとvwとの電圧差の極性が転流条件を決定す
る。すなわち、 vu＞vw:U素子のパワートランジスタのしゃ断で転流す
る。FIG. 5 shows an example at this time, in which element U → element W
This shows the state of commutation to. In commutation from U to W, the polarity of the voltage difference between the input voltages v u and v w of the converter determines the commutation condition. That is, v u > v w : commutation occurs when the power transistor of the U element is cut off.
vu＜vw:U素子のダイオードの逆阻止で転流する。v u <v w : Commutated by reverse blocking of the U element diode.
このように、電圧極性によりパワートランジスタまた
はダイオードによる転流が行なわれるが、特にパワート
ランジスタしゃ断の場合はそのベース信号に対し実際に
主電流がオフするまでの遅れが大きく、ダイオードの逆
阻止による転流の場合よりも長くなる。その結果、PWM
の制御信号と実際の主電流のPWM動作とに違いが生じて
しまい、主電流には本来のPWMには含まれないはずの低
次の高調波（非理論高調波）を多く含むことになる。特
に、PWMコンバータの入力側にLCフィルタ（ローパスフ
ィルタ）を設けた場合は共振周波数が存在するため、本
来のPWM電流からのずれによって生じる高調波で共振
し、過大な電流を流してしまう可能性もある。As described above, commutation is performed by the power transistor or the diode depending on the voltage polarity. Particularly, when the power transistor is cut off, the delay until the main current is actually turned off with respect to the base signal is large, and the diode is blocked by reverse blocking. It is longer than in the case of flow. As a result, the PWM
And the actual main current PWM operation will be different, and the main current will contain many low-order harmonics (non-theoretical harmonics) that should not be included in the original PWM . In particular, if an LC filter (low-pass filter) is provided on the input side of the PWM converter, there is a resonance frequency, so resonance may occur due to harmonics caused by deviation from the original PWM current, and an excessive current may flow. There is also.
したがって、この発明の課題は、PWM制御信号と同じ
ように主電流を動作させ、PWMの実電流に非理論高調波
を含ませないようにすることにある。Therefore, an object of the present invention is to operate the main current in the same manner as the PWM control signal so that the actual current of the PWM does not include non-theoretical harmonics.
スイッチング素子が自己消弧形素子で構成され、直流
出力側に電流平滑用リアクトルを持ち、交流を直流に変
換する電流形PWMコンバータにおいて、その入力電圧の
極性を示す信号を用いて前記コンバータの各相の転流状
態を監視し、転流の遅れが大きい自己消弧素子側の転流
の場合は、この遅れに相当する分を補正した信号を制御
信号として与える。The switching element is constituted by a self-extinguishing element, has a current smoothing reactor on the DC output side, and in a current source PWM converter for converting AC to DC, each of the converters using a signal indicating the polarity of the input voltage. The commutation state of the phase is monitored, and in the case of commutation on the self-extinguishing element side where the commutation delay is large, a signal corresponding to the delay is corrected and given as a control signal.
電圧極性から転流がパワートランジスタのしゃ断によ
るものかダイオードの逆阻止によるものかを判断し、前
者の場合は主電流の遅れを見込んで制御信号を補正する
ことにより、主電流からしゃ断遅れにて生じるPWM波形
のずれによる非理論高調波を低減し、電源電流の高調波
成分を低減する。Judging from the voltage polarity whether the commutation is due to the interruption of the power transistor or the reverse blocking of the diode.In the former case, the control signal is corrected in anticipation of the delay of the main current and the interruption from the main current is delayed. Reduces non-theoretical harmonics due to generated PWM waveform shift, and reduces harmonic components of power supply current.
第１図はこの発明の実施例を示す構成図で、７は電圧
極性検出回路、８は遅れ時間補正回路、９は遅れ時間設
定回路を示し、その他は第３図と同様である。FIG. 1 is a block diagram showing an embodiment of the present invention, wherein 7 is a voltage polarity detection circuit, 8 is a delay time correction circuit, 9 is a delay time setting circuit, and the other components are the same as those in FIG.
すなわち、コンバータ３の制御信号としては電源電圧
の周波数と同期をとるため、第３図と同様に電源入力ラ
インに同期検出回路５を設ける。PWM発生回路６はこの
同期信号を受けて、コンバータ３のスイッチ素子の各ベ
ースに与える制御信号を作成するが、ここではパワート
ランジスタのしゃ断遅れ時間に相当する分だけ信号の立
ち上がりを早め、立ち下がりを遅らせるように補正して
いる。遅れ時間補正回路８はPWM信号の各エッジでパル
スを出力するワンショト回路からなり、このパルス幅が
上記の短くしたしゃ断遅れ時間に相当したものと同じに
なるようにしている。さらに、各素子の転流条件を決定
するためにPWMコンバータの電圧を電圧極性検出回路７
で検出し、各転流時点の電圧極性を判定する。That is, the synchronization detection circuit 5 is provided on the power supply input line as in FIG. 3 in order to synchronize the control signal of the converter 3 with the frequency of the power supply voltage. The PWM generation circuit 6 receives this synchronizing signal and creates a control signal to be applied to each base of the switch element of the converter 3. Here, the rise of the signal is advanced by the amount corresponding to the cutoff delay time of the power transistor, and the fall is made. Is corrected to delay. The delay time correction circuit 8 is composed of a one-shot circuit that outputs a pulse at each edge of the PWM signal, and the pulse width is set to be the same as that corresponding to the above-mentioned cutoff delay time. Further, in order to determine the commutation condition of each element, the voltage of the PWM converter is changed to a voltage polarity detection circuit 7.
And the voltage polarity at each commutation point is determined.
そして、転流遅れ時間を補正したPWM信号（PWM節制
回路の出力）と、このPWM信号の切り替わりエッジから
転流遅れ時間分のパルス幅信号を出力する回路８からの
ワンショット信号と、PWMコンバータの電圧極性判別
信号とから、 ｉ）転流がダイオードの場合は、ワンショット信号をPW
M信号に加算して出力する（つまり、本来のPWM信号に戻
す）。Then, a PWM signal (output of the PWM control circuit) in which the commutation delay time is corrected, a one-shot signal from the circuit 8 that outputs a pulse width signal corresponding to the commutation delay time from the switching edge of the PWM signal, and a PWM converter I) If the commutation is a diode, the one-shot signal is
It is added to the M signal and output (that is, it returns to the original PWM signal).
ii）転流がパワートランジスタの場合は、補正されたPW
M信号をそのまま出力する。ii) If the commutation is a power transistor, the corrected PW
Output M signal as it is.
の如くPWM信号を決定する。 The PWM signal is determined as follows.
第２図は以上の動作を示すタイムチャートである。こ
れは、素子U,W間の転流状態を示すもので、電圧極性か
らPWM波形を補正する様子を示している。すなわち、同
図（イ）はU,W間の電圧、同図（ロ）は電圧極性信号
、同図（ハ）はその一部拡大図、同図（ニ）は転流遅
れ時間分だけ補正したPWM信号、同図（ホ）はワンシ
ョット信号、同図（ヘ）は電圧極性によりワンショッ
ト信号を用いて補正したPWM信号をそれぞれ示し、
この信号が各素子の制御信号としてその各ベースに与
えられる。FIG. 2 is a time chart showing the above operation. This shows a commutation state between the elements U and W, and shows how the PWM waveform is corrected based on the voltage polarity. That is, (a) is a voltage between U and W, (b) is a voltage polarity signal, (c) is a partially enlarged view, and (d) is a commutation delay time. (E) shows a one-shot signal, and (f) shows a PWM signal corrected using the one-shot signal according to the voltage polarity.
This signal is given to each base as a control signal for each element.
以上をまとめると、第2A図のようになる。つまり、時
刻t1,t2は転流がパワートランジスタによる場合を示し
ており、補正されたPWM信号がそのまま与えられている
ことが分かる。The above is summarized in Fig. 2A. That is, at times t1 and t2, the commutation is caused by the power transistor, and it can be seen that the corrected PWM signal is provided as it is.
上記では素子U,W間の転流の場合について説明した
が、他の相間での転流についても以上と同様の考え方で
PWM信号を補正することが可能である。また、台形波変
調の場合について説明したが、正弦波変調等の他の変調
方式の場合も同様に適用することができる。Although the case of commutation between the elements U and W has been described above, commutation between other phases is performed in the same way as described above.
It is possible to correct the PWM signal. Although the case of trapezoidal wave modulation has been described, the present invention can be similarly applied to other modulation methods such as sine wave modulation.
また、この発明は３相コンバータ以外の単相または多
相コンバータにも適用することができ、半導体スイッチ
がGTOの場合にも適用することができる。Further, the present invention can be applied to a single-phase or multi-phase converter other than the three-phase converter, and can also be applied to a case where the semiconductor switch is a GTO.
この発明によれば、電圧極性によるスイッチの遅れに
対しPWMパルスに遅れ分の補正をすることにより、実際
の主電流をPWM制御信号とほぼ同じものにすることがで
き、その結果、PWMパルスのずれによる非理論高調波が
低減され、電源高調波電流を小さくすることができる。According to the present invention, the actual main current can be made substantially the same as the PWM control signal by correcting the delay of the PWM pulse with respect to the delay of the switch due to the voltage polarity. Non-theoretical harmonics due to the displacement are reduced, and the power supply harmonic current can be reduced.
第１図はこの発明の実施例を示す構成図、第２図はその
動作を説明するためのタイムチャート、第2A図はこの発
明によるPWM信号の補正方法を説明するための説明図、
第３図は従来例を示す構成図、第４図はその動作を説明
するためのタイムチャート、第５図はダイオードの逆阻
止による転流とパワートランジスタのしゃ断による転流
との違いを説明するための説明図である。 １……リアクトル、２……コンデンサ、３……PWMコン
バータ、４……平滑リアクトル、５……同期検出回路、
６……PWM発生回路、７……電圧極性検出回路、８……
遅れ時間補正回路、９……遅れ時間設定回路。FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a time chart for explaining its operation, FIG. 2A is an explanatory diagram for explaining a PWM signal correcting method according to the present invention,
FIG. 3 is a block diagram showing a conventional example, FIG. 4 is a time chart for explaining its operation, and FIG. 5 explains the difference between commutation due to reverse blocking of a diode and commutation due to interruption of a power transistor. FIG. 1 ... reactor, 2 ... capacitor, 3 ... PWM converter, 4 ... smoothing reactor, 5 ... synchronization detection circuit,
6 ... PWM generation circuit, 7 ... Voltage polarity detection circuit, 8 ...
Delay time correction circuit, 9... Delay time setting circuit.
Claims (1)
され、直流出力側に電流平滑用リアクトルを持ち、交流
を直流に変換する電流形PWMコンバータにおいて、その
入力電圧の極性を示す信号を用いて前記コンバータの各
相の転流状態を監視し、転流の遅れが大きい自己消弧素
子側の転流の場合は、この遅れに相当する分を補正した
信号を制御信号として与えることを特徴とする電流形PW
Mコンバータの制御方法。A switching element is constituted by a self-extinguishing type element, has a current smoothing reactor on a DC output side, and uses a signal indicating the polarity of an input voltage in a current type PWM converter for converting AC to DC. The commutation state of each phase of the converter is monitored, and in the case of commutation on the self-extinguishing element side where the commutation delay is large, a signal corresponding to the delay is corrected and given as a control signal. Current type PW
Control method of M converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22244090A JP2738138B2 (en) | 1990-08-27 | 1990-08-27 | Control method of current source PWM converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22244090A JP2738138B2 (en) | 1990-08-27 | 1990-08-27 | Control method of current source PWM converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04105561A JPH04105561A (en) | 1992-04-07 |
| JP2738138B2 true JP2738138B2 (en) | 1998-04-08 |
Family
ID=16782436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22244090A Expired - Lifetime JP2738138B2 (en) | 1990-08-27 | 1990-08-27 | Control method of current source PWM converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2738138B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3246224B2 (en) * | 1994-09-27 | 2002-01-15 | 富士電機株式会社 | PWM converter |
-
1990
- 1990-08-27 JP JP22244090A patent/JP2738138B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04105561A (en) | 1992-04-07 |
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