JP2547652B2 - Power converter - Google Patents
Power converterInfo
- Publication number
- JP2547652B2 JP2547652B2 JP2125774A JP12577490A JP2547652B2 JP 2547652 B2 JP2547652 B2 JP 2547652B2 JP 2125774 A JP2125774 A JP 2125774A JP 12577490 A JP12577490 A JP 12577490A JP 2547652 B2 JP2547652 B2 JP 2547652B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- current
- conversion circuit
- detecting
- 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 - Fee Related
Links
Description
【発明の詳細な説明】 （イ） 産業上の利用分野 本発明は、燃料電池などの直流電源を交流に変換する
電力変換装置に関する。Description: (a) Field of Industrial Application The present invention relates to a power converter for converting a direct current power source such as a fuel cell into an alternating current.
（ロ） 従来の技術 第２図は、本願出願人が特願昭63−307506号において
提案した電力変換装置を示す。(B) Conventional Technology FIG. 2 shows a power conversion device proposed by the applicant of the present application in Japanese Patent Application No. 63-307506.
ここで、１は燃料電池などの直流電源、２は直流リア
クトル、３はトランジスタ４、ダイオード５、電解コン
デンサ６よりなり直流電源１の出力電圧を昇圧する直流
−直流変換回路、７は直流−直流変換回路３の出力を交
流に変換する直流−交流変換回路即ちインバータ、８は
直流−交流変換回路７の出力により駆動される負荷であ
る。Here, 1 is a direct current power source such as a fuel cell, 2 is a direct current reactor, 3 is a transistor 4, a diode 5, and a DC-DC converter circuit which boosts the output voltage of the direct current power source 1 comprising an electrolytic capacitor 6, and 7 is a direct current-direct current. A DC-AC conversion circuit, that is, an inverter that converts the output of the conversion circuit 3 into an AC, and a load 8 driven by the output of the DC-AC conversion circuit 7.
９は直流−直流変換回路３の出力電圧を検出する電圧
検出手段、10は直流−直流変換回路３の出力電圧の目標
値を設定する設定手段、11は直流−直流変換回路３の入
力電流を検出する第１直流検出手段、12は第１電流検出
手段11の検出結果を入力とし、直流リアクトル２に流れ
る直流入力電流に含まれるリップル電流の周期よりも十
分長い時定数をもつ第１フィルタ回路、13は第１電流検
出手段11の検出結果を入力とし、直流リアクトル２に流
れる直流入力電流に含まれるリップル電流の周期に近い
時定数をもつ第２フィルタ回路、14は第１フィルタ回路
12と第２フィルタ回路13との出力差を生成する加算点、
15は加算点14の出力によって設定手段10の設定値を変更
する変更手段としての加算点、16は電圧検出手段９の検
出結果を加算点15の出力と比較する比較手段としての加
算点、17は加算点16の出力に基づきトランジスタ４に信
号を与えて直流−直流変換回路３の動作を制御する制御
手段としてのパルス幅制御回路である。Reference numeral 9 is a voltage detecting means for detecting the output voltage of the DC-DC converting circuit 3, 10 is setting means for setting a target value of the output voltage of the DC-DC converting circuit 3, and 11 is an input current of the DC-DC converting circuit 3. The first DC detection means 12 for detection receives the detection result of the first current detection means 11, and has a time constant sufficiently longer than the period of the ripple current contained in the DC input current flowing through the DC reactor 2. , 13 is a second filter circuit having a time constant close to the period of the ripple current contained in the DC input current flowing in the DC reactor 2, 13 being the input of the detection result of the first current detecting means 11, and 14 is the first filter circuit
12 and an addition point for generating an output difference between the second filter circuit 13,
Reference numeral 15 is an addition point as a changing means for changing the set value of the setting means 10 by the output of the addition point 14, 16 is an addition point as a comparison means for comparing the detection result of the voltage detection means 9 with the output of the addition point 15, 17 Is a pulse width control circuit as a control means for controlling the operation of the DC-DC conversion circuit 3 by giving a signal to the transistor 4 based on the output of the addition point 16.
而して、第１フィルタ回路12は直流リアクトル２に流
れるリップル電流の周期よりも十分長い時定数をもつか
ら、第１フィルタ回路12の出力には直流リアクトル２に
流れる電流の直流分に相当する信号が得られる。また第
２フィルタ回路13は直流リアクトル２に流れるリップル
電流の周期に近い時定数をもつから、第２フィルタ回路
13の出力には直流リアクトル２に流れる電流のリップル
分を含んだ信号が得られる。従って、第１フィルタ回路
12と第２フィルタ回路13との出力差を生成する加算点14
では、直流リアクトル２に流れる電流のリップル分に相
当する信号が得られる。よって本構成によれば、設定手
段10の設定値をかかる信号に基づいて変更して電圧検出
手段９の検出結果と比較し、かかる比較結果に基づいて
直流−直流変換回路３を制御するので、直流リアクトル
２に流れるリップル電流を抑制するように制御を行うこ
とができ、直流リアクトル２、電解コンデンサ６を小型
化できるなどの利点がある。Since the first filter circuit 12 has a time constant sufficiently longer than the cycle of the ripple current flowing in the DC reactor 2, the output of the first filter circuit 12 corresponds to the DC component of the current flowing in the DC reactor 2. The signal is obtained. Since the second filter circuit 13 has a time constant close to the period of the ripple current flowing in the DC reactor 2, the second filter circuit 13
At the output of 13, a signal containing the ripple component of the current flowing in the DC reactor 2 is obtained. Therefore, the first filter circuit
Addition point 14 for generating the output difference between 12 and the second filter circuit 13
Then, a signal corresponding to the ripple of the current flowing through the DC reactor 2 is obtained. Therefore, according to this configuration, the setting value of the setting means 10 is changed based on such a signal to compare with the detection result of the voltage detecting means 9, and the DC-DC conversion circuit 3 is controlled based on the comparison result. Control can be performed so as to suppress the ripple current flowing in the DC reactor 2, and there are advantages that the DC reactor 2 and the electrolytic capacitor 6 can be downsized.
しかしながら、かかる構成では、定常状態の負荷、も
しくは第１フィルタ回路12の時定数よりも遅い負荷変動
に対しては良好な運転制御が可能であるが、急激な負荷
変動などにより入力電流が急増する場合には、電流変化
を少なくするように制御がなされてしまうため、電解コ
ンデンサ６の電圧が下がってしまい出力波形が歪んでし
まうという問題がある。However, with such a configuration, good operation control is possible for a steady-state load or a load change slower than the time constant of the first filter circuit 12, but the input current increases rapidly due to a sudden load change or the like. In this case, the control is performed so as to reduce the change in current, so that the voltage of the electrolytic capacitor 6 is lowered and the output waveform is distorted.
（ハ） 発明が解決しようとする課題 本発明は、定常状態はもちろん、急激な負荷変動など
があって電流が急増しても、波形歪みの少ない出力が得
られる出力変換装置を提供するものである。(C) Problem to be Solved by the Invention The present invention provides an output conversion device that can obtain an output with less waveform distortion even when the current suddenly increases due to a sudden load change or the like in the steady state. is there.
（ニ） 課題を解決するための手段 本発明電力変換装置は、直流電源を昇圧あるいは降圧
する直流−直変変換回路と、該直流−直流変換回路の出
力を交流に変換する直流−交流変換回路と、前記直流−
直流変換回路の出力電圧を検出する電圧検出手段と、前
記直流−直流変換回路の出力電圧の目標値を設定する設
定手段と、前記直流−直流変換回路の入力電流を検出す
る第１電流検出手段と、該第１電流検出手段の検出結果
を入力する第１及び第２フィルタ回路と、前記直流−交
流変換回路の入力電流を検出する第２電流検出手段と、
該第２電流検出手段の検出結果を入力する微分回路と、
該微分回路の出力及び前記第１及び第２のフィルタ回路
の出力差によって前記設定手段の設定値を変更する変更
手段と、前記電圧検出手段の検出結果を前記変更手段の
出力と比較する比較手段と、該比較手段の出力により前
記直流−直流変換回路を制御する制御手段とよりなるこ
とを特徴とする。(D) Means for Solving the Problems A power conversion device of the present invention is a DC-direct conversion converter that steps up or steps down a DC power supply, and a DC-AC conversion circuit that converts the output of the DC-DC conversion circuit into AC. And the DC-
Voltage detection means for detecting the output voltage of the DC conversion circuit, setting means for setting a target value of the output voltage of the DC-DC conversion circuit, and first current detection means for detecting the input current of the DC-DC conversion circuit. A first and a second filter circuit for receiving the detection result of the first current detecting means, and a second current detecting means for detecting an input current of the DC-AC converting circuit,
A differentiating circuit for inputting the detection result of the second current detecting means,
Changing means for changing the set value of the setting means according to the output of the differentiating circuit and the output difference of the first and second filter circuits, and comparing means for comparing the detection result of the voltage detecting means with the output of the changing means. And a control means for controlling the DC-DC conversion circuit by the output of the comparison means.
（ホ） 作用 第１フィルタ回路と第２フィルタ回路の出力差によっ
て電流のリップル分が検出される。また、第２電流検出
手段により直流−交流変換回路の入力電流が検出されて
負荷の状態が察知され、微分回路により第２電流検出手
段の検出結果を微分すれば、負荷の変動分が検出され
る。(E) Action The ripple component of the current is detected by the output difference between the first filter circuit and the second filter circuit. Further, the second current detecting means detects the input current of the DC-AC converting circuit to detect the state of the load, and the differentiating circuit differentiates the detection result of the second current detecting means to detect the load variation. It
そして、これらの検出結果に基づいて、リップル成分
の発生を抑制し、且つ波形歪みの発生を抑制するよう
に、パルス幅制御回路による直流−直流変換回路の制御
が行われる。Then, based on these detection results, the DC-DC conversion circuit is controlled by the pulse width control circuit so as to suppress the generation of ripple components and suppress the generation of waveform distortion.
（ヘ） 実施例 第１図は本発明電力変換装置の一実施例を示す。ここ
では、先に説明した従来例と同一の部分には同一符号を
付して説明を省略し、異なる部分についてのみ説明す
る。(F) Embodiment FIG. 1 shows an embodiment of the power converter of the present invention. Here, the same parts as those of the conventional example described above are designated by the same reference numerals, and the description thereof will be omitted. Only different parts will be described.
18は直流−交流変換回路７の入力電流を検出する第２
電流検出手段、19は第２電流検出手段18の検出結果を入
力する微分回路である。変更手段としての加算点15は、
微分回路19の出力及び加算点14により生成される第１フ
ィルタ回路12と第２フィルタ回路13との出力差によって
設定手段10の設定値を変更する。そして、比較手段とし
ての加算点16は電圧検出手段９の検出結果を加算点15の
出力と比較し、その比較結果をパルス幅制御回路17に与
える。18 is a second for detecting the input current of the DC-AC conversion circuit 7
The current detecting means, 19 is a differentiating circuit for inputting the detection result of the second current detecting means 18. Addition point 15 as a change means,
The set value of the setting means 10 is changed according to the output of the differentiating circuit 19 and the output difference between the first filter circuit 12 and the second filter circuit 13 generated by the addition point 14. Then, the addition point 16 as a comparison means compares the detection result of the voltage detection means 9 with the output of the addition point 15 and supplies the comparison result to the pulse width control circuit 17.
而して、急激な負荷変動などがあって電流が急増する
と、第２電流検出手段18により入力電流が検出されて負
荷の状態が察知され、その検出結果は微分回路19により
微分されて負荷の変動分が検出される。そして、かかる
負荷の変動分は、リップル分を除去するための第１フィ
ルタ回路12と第２フィルタ回路13との出力差とともに設
定手段10の設定値を変更するフィードバックに利用され
る。そして、パルス幅制御回路17による制御は、その変
更された設定値と電圧検出手段９の検出結果との比較結
果に基づいて、リップル成分の発生を抑制し、且つ急激
な負荷変動などがあって電流が急増しても、電解コンデ
ンサ６の電圧低下を防いで波形歪みの発生を抑制するよ
うに行われ、波形歪みの少ない出力が得られる。Then, when the current suddenly increases due to a sudden load change or the like, the input current is detected by the second current detecting means 18 to detect the state of the load, and the detection result is differentiated by the differentiating circuit 19 to detect the load. The fluctuation is detected. The load variation is used as feedback for changing the set value of the setting means 10 together with the output difference between the first filter circuit 12 and the second filter circuit 13 for removing the ripple. The control by the pulse width control circuit 17 is based on the comparison result of the changed set value and the detection result of the voltage detection means 9 to suppress the generation of the ripple component and to cause a sudden load change. Even if the current suddenly increases, the voltage drop of the electrolytic capacitor 6 is prevented so that the generation of the waveform distortion is suppressed, and the output with less waveform distortion is obtained.
（ト） 発明の効果 本発明によれば、第１フィルタ回路と第２フィルタ回
路を出力差によって電流のリップル分が検出され、第２
電流検出手段と微分回路により負荷の変動分が検出され
る。そして、それらの検出結果に基づいて、リップル成
分の発生を抑制し、且つ波形歪みの発生を抑制するよう
に、パルス幅制御回路による直流−直流変換回路の制御
が行われる。従って、定常状態におけるリップル成分の
発生や急激な負荷変動などによる波形歪みの抑制され、
出力の波形歪みの少ない電力変換装置を提供できる。(G) Effect of the Invention According to the present invention, the ripple component of the current is detected by the output difference between the first filter circuit and the second filter circuit.
The load variation is detected by the current detecting means and the differentiating circuit. Then, based on these detection results, the DC-DC converter circuit is controlled by the pulse width control circuit so as to suppress the generation of ripple components and suppress the generation of waveform distortion. Therefore, the waveform distortion due to the occurrence of ripple components in the steady state and sudden load changes is suppressed,
A power converter with less output waveform distortion can be provided.
第１図は本発明の一実施例を示す回路系統図、第２図は
従来例を示す回路系統図である。 １……直流電源、３……直流−直流変換回路、７……直
流−交流変換回路、９……電圧検出手段、10……設定手
段、11……第１電流検出手段、12……第１フィルタ回
路、13……第２フィルタ回路、14,15,16……加算点、17
……パルス幅制御回路。FIG. 1 is a circuit system diagram showing an embodiment of the present invention, and FIG. 2 is a circuit system diagram showing a conventional example. 1 ... DC power supply, 3 ... DC-DC conversion circuit, 7 ... DC-AC conversion circuit, 9 ... voltage detection means, 10 ... setting means, 11 ... first current detection means, 12 ... first 1 filter circuit, 13 ... 2nd filter circuit, 14, 15, 16 ... addition point, 17
...... Pulse width control circuit.
Claims (1)
変換回路と、該直流−直流変換回路の出力を交流に変換
する直流−交流変換回路と、前記直流−直流変換回路の
出力電圧を検出する電圧検出手段と、前記直流−直流変
換回路の出力電圧の目標値を設定する設定手段と、前記
直流−直流変換回路の入力電流を検出する第１電流検出
手段と、該第１電流検出手段の検出結果を入力する第１
及び第２フィルタ回路と、前記直流−交流変換回路の入
力電流を検出する第２電流検出手段と、該第２電流検出
手段の検出結果を入力する微分回路と、該微分回路の出
力及び前記第１及び第２のフィルタ回路の出力差によっ
て前記設定手段の設定値を変更する変更手段と、前記電
圧検出手段の検出結果を前記変更手段の出力と比較する
比較手段と、該比較手段の出力により前記直流−直流変
換回路を制御する制御手段とよりなることを特徴とする
電力変換装置。1. A DC-DC conversion circuit for stepping up or stepping down a DC power supply, a DC-AC conversion circuit for converting the output of the DC-DC conversion circuit into AC, and an output voltage of the DC-DC conversion circuit. Voltage detecting means for detecting, setting means for setting a target value of the output voltage of the DC-DC converting circuit, first current detecting means for detecting an input current of the DC-DC converting circuit, and the first current detecting First to input the detection result of the means
And a second filter circuit, a second current detection unit that detects an input current of the DC-AC conversion circuit, a differentiation circuit that inputs a detection result of the second current detection unit, an output of the differentiation circuit, and the By changing means for changing the set value of the setting means by the output difference of the first and second filter circuits, comparing means for comparing the detection result of the voltage detecting means with the output of the changing means, and by the output of the comparing means. A power conversion device comprising: a control unit that controls the DC-DC conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2125774A JP2547652B2 (en) | 1990-05-15 | 1990-05-15 | Power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2125774A JP2547652B2 (en) | 1990-05-15 | 1990-05-15 | Power converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0421362A JPH0421362A (en) | 1992-01-24 |
| JP2547652B2 true JP2547652B2 (en) | 1996-10-23 |
Family
ID=14918506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2125774A Expired - Fee Related JP2547652B2 (en) | 1990-05-15 | 1990-05-15 | Power converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2547652B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3949350B2 (en) * | 2000-04-24 | 2007-07-25 | 三菱電機株式会社 | Interconnection device |
| US7710700B2 (en) * | 2005-01-10 | 2010-05-04 | Linear Technology Corporation | DC/DC converter with current limit protection |
| KR101228767B1 (en) * | 2010-12-24 | 2013-01-31 | 삼성전기주식회사 | Switching mode power supply with multiple output |
-
1990
- 1990-05-15 JP JP2125774A patent/JP2547652B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0421362A (en) | 1992-01-24 |
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