JPS6023736Y2 - Current detection device for power conversion circuit - Google Patents
Current detection device for power conversion circuitInfo
- Publication number
- JPS6023736Y2 JPS6023736Y2 JP1975055388U JP5538875U JPS6023736Y2 JP S6023736 Y2 JPS6023736 Y2 JP S6023736Y2 JP 1975055388 U JP1975055388 U JP 1975055388U JP 5538875 U JP5538875 U JP 5538875U JP S6023736 Y2 JPS6023736 Y2 JP S6023736Y2
- Authority
- JP
- Japan
- Prior art keywords
- current
- diode
- detection device
- power conversion
- current detection
- 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
Links
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Rectifiers (AREA)
Description
【考案の詳細な説明】
本考案は電力変換回路における電流検出に関し、２個の
変流器を使用し零近辺の微少電流まで完全に検出し不感
帯をなくした電流検出装置を提供することを目的とする
。[Detailed description of the invention] The purpose of the present invention is to provide a current detection device that uses two current transformers to completely detect minute currents in the vicinity of zero and eliminates dead zones. shall be.
従来、この種装置は第１図に示すように３個の変流器１
，２，３を△またはＹに結線し、その二相交流電流を整
流回路４を介して低抵抗器５に加え、その両端電圧を検
出信号として取り出すもの、あるいは第２図に示すよう
に２個の変流器６．７をＶ結線しその各変流器の２次側
に低抵抗器８，９を接続し、電圧源に変換した後、整流
回路１０を介し負荷１１に加え、その両端電圧を測定す
るもの、等の方法がある。Conventionally, this type of device has three current transformers 1 as shown in FIG.
. Current transformers 6 and 7 are V-connected, and low resistance resistors 8 and 9 are connected to the secondary side of each current transformer to convert it into a voltage source. There are methods such as measuring the voltage at both ends.
しかるに前者の場合、変流器回路は定電流源であるので
ダイオードのえん層電圧の影響は無視でき回路的には零
電流まで測定できるが、変流器は３個必要となり、また
後者においては、負荷１１の両端電圧は整流回路１０の
ダイオードえん層電圧分だけ常に低下しており、第３図
示するグラフのように上記えん層電圧による不惑帯が生
じ零電流までの検出は不可能である。However, in the former case, since the current transformer circuit is a constant current source, the influence of the diode layer voltage can be ignored and the circuit can measure down to zero current, but three current transformers are required, and in the latter case, , the voltage across the load 11 is constantly decreasing by the diode cap layer voltage of the rectifier circuit 10, and as shown in the graph shown in Figure 3, a dead band occurs due to the cap layer voltage, making it impossible to detect up to zero current. .
本考案は上記に鑑み２個の変流器を使用し、且不感帯を
なくし微少電流まで検出できるようにした電流検出装置
を提供するものであり、以下図示する実施例により具体
的に説明する。In view of the above, the present invention provides a current detecting device that uses two current transformers, eliminates a dead zone, and is capable of detecting even minute currents.The present invention will be described in detail below with reference to embodiments shown in the drawings.
第４図は３相線ブリッジ回路であり、リアクトルＬＤが
十分大きく電流は連続しているものとする。FIG. 4 shows a three-phase line bridge circuit, and it is assumed that the reactor LD is sufficiently large and the current is continuous.
さすれば、上記回路における、Ｒ相、Ｓ相の各電流及び
負荷電流は第５図示する夫々の波形４９口、及びハで表
わすことができる。Accordingly, the R-phase and S-phase currents and the load current in the above circuit can be represented by the respective waveforms 49 and C shown in FIG.
第６図は第４図示する変流器ＣＴ１・Ｃｒ２の２次側回
路であり、変流器ＣＴ１に対応する整流回路Ｒｆ １．
変流ＮｃＴ２に対応の整流回路Ｒｆ２、各低抵抗器Ｒ１
・Ｒ２、ダイオードＤｌｌ、Ｄ１２及びＤ２１、Ｄ２２
、共通抵抗器ＶＲを図示のように接続して構成される。FIG. 6 is a secondary side circuit of the current transformers CT1 and Cr2 shown in FIG. 4, and the rectifier circuit Rf1.
Rectifier circuit Rf2 corresponding to current transformation NcT2, each low resistor R1
・R2, diode Dll, D12 and D21, D22
, and a common resistor VR are connected as shown.
すなわち、低抵抗器Ｒ１及びタイオードＤ１１が整流器
Ｒ，ｆｌを介して変流器ＣＴ１の負荷となり、同様に低
抵抗器Ｒ２及びダイオードＤ２２が整流器Ｒｆ２を介し
変流器ＣＴ２の負荷となる。That is, low resistor R1 and diode D11 serve as a load on current transformer CT1 via rectifiers R and fl, and similarly, low resistor R2 and diode D22 serve as a load on current transformer CT2 via rectifier Rf2.
従って、変流器ＣＴＩ、ＣＴ２の２次電流は点Ａ及びＢ
において電圧信号に変換され、且つその値は、変流器回
路が変成比と１次電流で定まる定電流回路であり、夫々
のダイオードＤ１１、Ｄ２２によるえん層電圧ｅｏを含
んでいる。Therefore, the secondary currents of current transformers CTI and CT2 are at points A and B.
The current transformer circuit is a constant current circuit determined by the transformation ratio and the primary current, and includes the enlayer voltage eo caused by the respective diodes D11 and D22.
このＡ及びＢ点の電圧信号はダイオードＤ１２．Ｄ２１
を介し共通抵抗器ＶＲへ加えられ、共通抵抗器ＶＲの電
圧は上記Ａ点またはＢ点電圧信号のうちいずれか高い方
の電圧となり、しかもダイオードＤ１２．Ｄ２１による
えん層重圧が差引かれる。The voltage signals at points A and B are connected to the diode D12. D21
is applied to the common resistor VR via the diode D12. Entlayer pressure due to D21 is subtracted.
即ち、ダイオードＤＩｌ〜Ｄ２２が同一材料、例えばシ
リコンダイオードであるならば、ダイオードＤｌｌ及び
Ｄ２２によるえん層重圧は夫々ダイオードＤ１２及びＤ
２２のそれにより相殺され、結局共通抵抗器ＶＲの電圧
は実際の負荷電流に対応した検出信号となる。That is, if the diodes DIl-D22 are made of the same material, for example, silicon diodes, the en-layer pressure caused by the diodes Dll and D22 will be the same as that of the diodes D12 and D22, respectively.
22, and eventually the voltage across the common resistor VR becomes a detection signal corresponding to the actual load current.
第７図の４９口、及び八に上記Ａ点、Ｂ点及び共通抵抗
器ＶＲ（Ｃ点）の各電圧信号波形を夫々表す。The voltage signal waveforms at the points A, B, and the common resistor VR (point C) are shown at points 49 and 8 in FIG. 7, respectively.
同図において、イ及び口は第５図示のＲ相、Ｓ相の各電
流波形に対応するものであり、ダイオードＤｌｌ、Ｄ２
２によるえん層重圧ｅｏを含んでいる。In the figure, A and A correspond to the R-phase and S-phase current waveforms shown in FIG. 5, and the diodes Dll and D2
It includes the entrapment pressure eo due to 2.
ハは上記えん層重圧ｅｏをダイオードＤ１２、Ｄ２１に
より相殺し、且つＡ点、Ｂ点の電圧信号のうちいずれか
大なる方の電圧信号をとる共通抵抗器ＶＲの電圧信号波
形である。C is the voltage signal waveform of the common resistor VR which cancels out the overburden layer pressure eo with the diodes D12 and D21 and takes the larger voltage signal of the voltage signals at point A and point B.
以上述べたように、本考案は３個の変流器を使用した従
来装置の検出特性を、２個の変流器を使用するだけで得
るようにしたものであり、主回路の実装の簡略化、大幅
なコストダウンを図ることができ、無整流子電動機、サ
イリスクレオナード、サイリスタ電源、インバータなど
の電流検出に最適である。As described above, the present invention achieves the detection characteristics of the conventional device using three current transformers by using only two current transformers, and simplifies the implementation of the main circuit. It is ideal for current detection of non-commutator motors, thyristor Leonard, thyristor power supplies, inverters, etc.
第１図、第２図は従来のこの種装置回路図、第３図は第
２図示する従来装置の電流検出特性図、第４図は３相純
ブリツジの回路図、第５図はその各部電流波形図、第６
図は本考案実施例の回路図、第７図はその各部電圧波形
図を夫々表わす。
ＣＴＩ、Ｃｒ２・・・・・・変流器、Ｒｆｉ、Ｒｆ２・
・・・・・整流回路、Ｒ１，Ｒ２・・・・・・低抵抗器
、ＤＩ １． Ｄ２２・・・・・・ダイオード、ＤＩ２
．Ｄ２１・・・・・・ダイオード、ＶＲ・・・・・・共
通抵抗器。Figures 1 and 2 are circuit diagrams of conventional devices of this type, Figure 3 is a current detection characteristic diagram of the conventional device shown in Figure 2, Figure 4 is a circuit diagram of a three-phase pure bridge, and Figure 5 is a diagram of its various parts. Current waveform diagram, 6th
The figure shows a circuit diagram of an embodiment of the present invention, and FIG. 7 shows voltage waveform diagrams of various parts thereof. CTI, Cr2...Current transformer, Rfi, Rf2・
... Rectifier circuit, R1, R2 ... Low resistor, DI 1. D22...Diode, DI2
．． D21...Diode, VR...Common resistor.
Claims (1)
の２相の電流を検出する２個の変流器、該各変流器の出
力を整流する夫々の整流回路、該各整流回路の直流側に
接続される夫々の低抵抗器とダイオード、を備えてなり
、上記低抵抗器とダイオードにより電流信号から変換さ
れた各電圧信号を夫々のダイオードを介して共通抵抗器
に加えるようにしたことを特徴とする電流検出装置。In a power conversion device using thyristors, etc., two current transformers that detect current in any two phases, respective rectifier circuits that rectify the output of each current transformer, and connections to the DC side of each rectifier circuit. and a diode, and each voltage signal converted from a current signal by the low resistor and diode is applied to the common resistor via the respective diode. Current detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1975055388U JPS6023736Y2 (en) | 1975-04-22 | 1975-04-22 | Current detection device for power conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1975055388U JPS6023736Y2 (en) | 1975-04-22 | 1975-04-22 | Current detection device for power conversion circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS51134729U JPS51134729U (en) | 1976-10-30 |
| JPS6023736Y2 true JPS6023736Y2 (en) | 1985-07-15 |
Family
ID=28207660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1975055388U Expired JPS6023736Y2 (en) | 1975-04-22 | 1975-04-22 | Current detection device for power conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6023736Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008034019A2 (en) | 2006-09-13 | 2008-03-20 | Polymerix Corporation | Active agents and their oligomers and polymers |
| US9144579B2 (en) | 2012-08-17 | 2015-09-29 | Rutgers, The State University Of New Jersey | Polyesters and methods of use thereof |
| US9387250B2 (en) | 2013-03-15 | 2016-07-12 | Rutgers, The State University Of New Jersey | Therapeutic compositions for bone repair |
-
1975
- 1975-04-22 JP JP1975055388U patent/JPS6023736Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS51134729U (en) | 1976-10-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0435996B2 (en) | ||
| JPS59198873A (en) | Rectified power source circuit | |
| JPS6023736Y2 (en) | Current detection device for power conversion circuit | |
| GB1344534A (en) | Polyphase power converter circuits | |
| KR890001255A (en) | DC power supply | |
| JP3129971B2 (en) | Transformerless three-phase converter | |
| JPH1052033A (en) | Three phase converter | |
| US3270272A (en) | Rectifying apparatus for producing constant voltage | |
| JP2618931B2 (en) | Power converter | |
| SU1345295A2 (en) | Three-phase annular phase detector | |
| JPS5849108B2 (en) | Dengen Sochi | |
| SU121178A1 (en) | Modulator | |
| JPH0425660Y2 (en) | ||
| SU392417A1 (en) | MEASURING VOLTAGE VOLTAGE CONVERTER TO PERMANENT | |
| SU983556A1 (en) | Valve converter current pickup | |
| JP2509890B2 (en) | Pulse width modulation control method for AC / DC converter | |
| JP2536916B2 (en) | Pulse width modulation control method for AC / DC converter | |
| KR940002619Y1 (en) | Controlling circuit for three phase thyristor | |
| JPH0526956Y2 (en) | ||
| JPS58157392A (en) | Load state monitor for ac motor | |
| JP2000055942A (en) | Method for detecting current of power converter | |
| JPS58116076A (en) | Detecting circuit for angle of allowance of commutation | |
| JPH0547074B2 (en) | ||
| SU1527672A1 (en) | Dc transformer | |
| SU538462A1 (en) | AC to DC converter |