JPS60216772A - Abnormal voltage detector of power converter - Google Patents

Abnormal voltage detector of power converter

Info

Publication number
JPS60216772A
JPS60216772A JP59072339A JP7233984A JPS60216772A JP S60216772 A JPS60216772 A JP S60216772A JP 59072339 A JP59072339 A JP 59072339A JP 7233984 A JP7233984 A JP 7233984A JP S60216772 A JPS60216772 A JP S60216772A
Authority
JP
Japan
Prior art keywords
signal
output
voltage
overvoltage
undervoltage
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
Application number
JP59072339A
Other languages
Japanese (ja)
Inventor
Shigeo Yamagata
山形 繁男
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co Ltd
Fuji Electric Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Electric Co Ltd, Fuji Electric Manufacturing Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP59072339A priority Critical patent/JPS60216772A/en
Publication of JPS60216772A publication Critical patent/JPS60216772A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

PURPOSE:To prevent a protecting circuit from erroneously operating by adding the output of an output current detector to the output signal of an overvoltage setter and the output signal of an insufficient voltage setter. CONSTITUTION:An output signal of a transistor inverter 3 is obtained from a rectifier 12 connected with the secondary side of a transformer 11 for an instrument. The inverter 3 is controlled by a deviation between the output signal and the set signal set by a voltage setter 13. The set signal set by an overcurrent setter 22 and the output signal from a level regulating resistor 19 is added by an adder 21. The addition signal and the output signal of the inverter 3 are compared by an overvoltage comparator 23. An adder 26 adds the set signal from an insufficient voltage setter 27 and an output siganl from the resistor 19, and the addition output is compared with the output signal of the inverter 3 by an insufficient voltage comparator 28.

Description

【発明の詳細な説明】 〔発明の属する技術分野〕 この発明は、線路電圧降下を補償して負荷の入力電圧を
一定に維持するようなされている電力変換装置の異常電
圧検出回路に関する。
DETAILED DESCRIPTION OF THE INVENTION [Technical Field to which the Invention Pertains] The present invention relates to an abnormal voltage detection circuit for a power conversion device that compensates for a line voltage drop and maintains a constant input voltage of a load.

〔従来技術とその問題点〕[Prior art and its problems]

コンピュータなどのように電源から供給される電力の入
力電圧が一定であることを必要とする負荷に対して、た
とえば入力が直流電力の場合はチョッパ、交流電力の場
合はインバータなどの電力変換装置を使用して、これを
定電圧の電源にすることが多い。しかしこの定電圧出力
の電力変換装置が供給する電力が変化すると、この電力
変換装置と負荷とを接続している線路の電圧降下が変動
するため、負荷の入力電圧が変動する。そこでこの電力
変換装置の出力電圧を負荷電流が増大するにつれて上昇
させるようにして、上述の線路電圧降下を補償するよう
にしている。
For loads that require a constant input voltage of power supplied from a power supply, such as a computer, use a power conversion device such as a chopper if the input is DC power, or an inverter if the input is AC power. This is often used as a constant voltage power source. However, when the power supplied by this constant voltage output power conversion device changes, the voltage drop in the line connecting this power conversion device and the load changes, so the input voltage of the load changes. Therefore, the output voltage of this power converter is increased as the load current increases to compensate for the line voltage drop mentioned above.

しかしながら、このようにして電力変換装置の出力電圧
を負荷電流に対応して上昇させると、この電力変換装置
にあらかじめ定められている過電圧検出値と出力電圧と
の差が小さくなるため、この電力変換装置出力電圧の僅
かな変動により過電圧異常を検出して警報を発したり、
あるいは電力変換装置の運転を停止させるなどの欠点を
有する。
However, when the output voltage of the power conversion device is increased in accordance with the load current in this way, the difference between the overvoltage detection value predetermined for this power conversion device and the output voltage becomes small, so this power conversion Detects overvoltage abnormality due to slight fluctuations in device output voltage and issues an alarm.
Otherwise, it has drawbacks such as stopping the operation of the power converter.

またこの線路電圧降下分だけ電力変換装置の出力電圧を
上昇させているので、この電力変換装置の不足電圧保護
回路が作動したときの負荷の入力電圧は、この不足電圧
検出値よりも更に下廻った値になっているので、この負
荷に対する不足電圧保護は不満足となる欠点もあわせて
有する。
Also, since the output voltage of the power converter is increased by this line voltage drop, the input voltage of the load when the undervoltage protection circuit of this power converter is activated is even lower than this undervoltage detection value. Since the current value is 100%, the undervoltage protection for this load is also unsatisfactory.

〔発明の目的〕[Purpose of the invention]

この発明は、線路電圧降下に対して負荷の入力電圧が一
定になるように出力電圧を制御している電力変換装置の
過電圧保護と不足電圧保護が適正に行えるようにするた
めの電力変換装置の異常電圧検出回路を提供することを
目的とする。
The present invention is directed to a power converter that can appropriately perform overvoltage protection and undervoltage protection of a power converter that controls the output voltage so that the input voltage of a load is constant against a line voltage drop. The purpose is to provide an abnormal voltage detection circuit.

〔発明の要点〕[Key points of the invention]

この発明は、電力変換装置が無負荷のときの過電圧設定
値と不足電圧設定値に負荷電流に対応する信号をそれぞ
れ別個に加算する加算器を設け、この加算器出力信号と
当該電力変換装置出力電圧とを比較して過電圧あるいは
不足電圧を検出するようにして、負荷電流により線路電
圧降下が変化しても、つねに適正な過電圧検出あるいは
不足電圧検出をなそうとするものである。
This invention provides an adder that separately adds a signal corresponding to a load current to an overvoltage set value and an undervoltage set value when a power converter is under no load, and combines this adder output signal with the output of the power converter. The system attempts to always perform appropriate overvoltage or undervoltage detection even if the line voltage drop changes due to load current, by comparing the voltage with the line voltage to detect overvoltage or undervoltage.

〔発明の実施例〕[Embodiments of the invention]

第1図は本発明の実施例を示す回路区であり、この第1
図により本発明の内容を以下に説明する。
FIG. 1 shows a circuit section showing an embodiment of the present invention.
The content of the present invention will be explained below with reference to figures.

第1図において、1なる直流電源からの直流電力は平滑
コンデンサ2によりその脈動分が除去される。この脈動
分が除去されて平滑された直流電力は電力変換装置とし
てのトランジスタインバータ3に入力され、一定周波数
で一定電圧の単相交流電力に変換されるのであるが、こ
の交流電力はりアクドルとコンデンサとでなるフィルタ
4により高調波が除去されて正弦波となり、この正弦波
交流電力が交流負荷5に与えられるようになっている。
In FIG. 1, a smoothing capacitor 2 removes the pulsation of DC power from a DC power source 1. In FIG. The smoothed DC power with this pulsating component removed is input to the transistor inverter 3 as a power converter, and is converted into single-phase AC power with a constant frequency and constant voltage. The harmonics are removed by the filter 4 to form a sine wave, and this sine wave AC power is applied to the AC load 5.

フィルタ4の負荷側には計器用変圧器11が接続されて
おり、この計器用変圧器工1の2次側に接続されている
整流回路12からは、トランジスタインバータ3の出力
電圧信号が得られる。この出力電圧信号と、電圧設定器
13が設定する設定電圧信号との偏差が加算点14にお
いて演算され、その演算結果が比例積分演算器でなる電
圧調節器15に入力され、この電圧調節器15からは前
述の偏差を零にする制御信号が出力され、ベース駆動回
路16を経てトランジスタインバータ3を構成している
各トランジスタを適切にオン・オフさせることにより、
このトランジスタインバータ3の出力電圧は電圧設定器
13が定める設定電圧を維持するのである。しかし交流
負荷5の消費電力が変化するとき、トランジスタインバ
ータ3と交流負荷5とを接続している線路の電圧降下も
変動するので、トランジスタインバ・−夕3の出力電圧
を上述のようにして一定値に制御しても、交流負荷5の
入力電圧は一定しない。そこでこの線路に変流器17を
挿入し、その2次側に接続された整流回路18から得ら
れるトランジスタインバータ3の出力電流信号をレベル
調整抵抗19により適当なレベルに調整したのち、電圧
設定器13からの設定電圧信号と同じ極性で加算点14
に与える。
A voltage transformer 11 is connected to the load side of the filter 4, and an output voltage signal of the transistor inverter 3 is obtained from a rectifier circuit 12 connected to the secondary side of the voltage transformer 1. . The deviation between this output voltage signal and the set voltage signal set by the voltage setting device 13 is calculated at the addition point 14, and the calculation result is input to the voltage regulator 15, which is a proportional-integral calculator. A control signal that makes the aforementioned deviation zero is outputted from the base drive circuit 16, and the transistors constituting the transistor inverter 3 are turned on and off appropriately.
The output voltage of the transistor inverter 3 is maintained at the set voltage determined by the voltage setting device 13. However, when the power consumption of the AC load 5 changes, the voltage drop on the line connecting the transistor inverter 3 and the AC load 5 also changes, so the output voltage of the transistor inverter 3 is kept constant as described above. Even if the voltage is controlled to a certain value, the input voltage of the AC load 5 is not constant. Therefore, a current transformer 17 is inserted into this line, and the output current signal of the transistor inverter 3 obtained from the rectifier circuit 18 connected to the secondary side is adjusted to an appropriate level by a level adjustment resistor 19. Addition point 14 with the same polarity as the set voltage signal from 13
give to

このようにすれば負荷が変化して線路電圧降下が増大す
るとき、その電圧降下分だけ設定電圧を上昇させるので
、トランジスタインバータ3の出力電圧は線路電圧降下
分が加算されることになり、交流負荷5の入力電圧は一
定値を維持することになる。
In this way, when the load changes and the line voltage drop increases, the set voltage is increased by the voltage drop, so the output voltage of the transistor inverter 3 is added to the line voltage drop, and the AC The input voltage of the load 5 will maintain a constant value.

21なる加算器は過電圧設定器22が設定する信号とレ
ベル調整抵抗19からの出力電流信号とを加算する。そ
れ故この加算器21から出力される過電圧設定信号は当
該トランジスタインバータ3の出力電圧と同様に出力電
流による線路電圧降下分が加算されることになるから、
交流負荷5に与えられる電力が変化してトランジスタイ
ンバータ3の出力電圧が変動すれば、この過電圧設定信
号もこの出力電圧と一定の電圧差で変動する。この加算
器21からの過電圧設定信号とトランジスタインバータ
3の出力電圧信号とが過電圧コンパレータ23で常時比
較されていて、なにかの異常によりインバータ3の出力
電圧の方が高くなると、との過電圧コンパレータ23か
らは過電圧異常信号が発せられるのである。
An adder 21 adds the signal set by the overvoltage setting device 22 and the output current signal from the level adjustment resistor 19. Therefore, the line voltage drop due to the output current is added to the overvoltage setting signal output from the adder 21 in the same way as the output voltage of the transistor inverter 3.
When the output voltage of the transistor inverter 3 changes due to a change in the power applied to the AC load 5, this overvoltage setting signal also changes with a constant voltage difference from this output voltage. The overvoltage setting signal from the adder 21 and the output voltage signal of the transistor inverter 3 are constantly compared by the overvoltage comparator 23, and if the output voltage of the inverter 3 becomes higher due to some abnormality, the overvoltage setting signal from the overvoltage comparator 23 An overvoltage abnormality signal is generated.

26なる第2加算器では不足電圧設定器27が設定する
信号と、レベル調整抵抗19からの出力電流信号とが加
え合わされるので、このM2加算器26から出力される
不足電圧設定信号は、上述の過電圧設定信号と同様にト
ランジスタインバータ3が出力する電力の変化とともに
変動する出力電圧と一定の電圧差で変動することになる
。それ故この第2加算器26が出力する不足電圧設定信
号と、当該トランジスタインバータ3の出力電圧信号と
を不足電圧コンパレータ28に入力させてこの両信号を
常時比較し、インバータ3の出力電圧信号の方が異常の
ために低くなれば、この不足電圧コンパレータ28は不
足電圧異常信号を発するのである。
In the second adder 26, the signal set by the undervoltage setter 27 and the output current signal from the level adjustment resistor 19 are added, so the undervoltage setting signal output from the M2 adder 26 is as described above. Similarly to the overvoltage setting signal, the output voltage varies with a change in the power output from the transistor inverter 3, and the output voltage varies by a constant voltage difference. Therefore, the undervoltage setting signal output from the second adder 26 and the output voltage signal of the transistor inverter 3 are input to the undervoltage comparator 28, and these two signals are constantly compared. If the voltage becomes low due to an abnormality, the undervoltage comparator 28 issues an undervoltage abnormality signal.

〔発明の効果〕〔Effect of the invention〕

この発明によれば電力変換装置の出力電力が変動するの
に伴う線路電圧降下を補償するために、電力変換装置の
出力回路に電流検出回路を設け、この電流検出回路出力
信号の増加に伴って当該電力変換装置出力電圧を上昇さ
せて、負荷に印加される電圧が線路電圧降下に影響され
ないようにしている。それと同時にこの電流検出回路出
力信号を過電圧設定器出力信号と不足電圧設定器出力信
号に、それぞれ別個に加算している。このように構成す
ることにより過電圧設定信号と不足電圧設定信号は、当
該電力変換装置の出力の変化とともに変動するので、こ
れら過電圧設定信号と不足電圧設定信号は常時は電力変
換装置出力電圧と一定電圧差を保つ。それ故従来のよう
に僅かな電圧変動で過電圧警報が発令されたり、負荷の
入力電圧が大幅に低下していても不足電圧警報が出ない
などの不都合は解消され、適正な設定幅で異常電圧を警
報させることができる。
According to this invention, a current detection circuit is provided in the output circuit of the power conversion device in order to compensate for the line voltage drop accompanying fluctuations in the output power of the power conversion device, and as the output signal of the current detection circuit increases, The output voltage of the power converter is increased so that the voltage applied to the load is not affected by line voltage drops. At the same time, this current detection circuit output signal is separately added to the overvoltage setting device output signal and the undervoltage setting device output signal. With this configuration, the overvoltage setting signal and undervoltage setting signal fluctuate with changes in the output of the power converter, so these overvoltage setting signal and undervoltage setting signal are always set to the output voltage of the power converter and a constant voltage. Keep the difference. Therefore, the inconveniences of conventional methods, such as an overvoltage alarm being issued due to a slight voltage fluctuation, or an undervoltage alarm not being issued even if the input voltage of the load has significantly decreased, are eliminated. can be alerted.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の実施例を示す回路図である。 1・・・直流電源、2・・・平滑コンデンサ、3・・・
電力変換装置としてのトランジスタインバータ、4・・
・フィルタ、5・・・交流負荷、11・・・計器用変圧
器、13・・・電圧設定器、15・・・電圧調節器、1
6・・・ペース駆動回路、17・・・変流器、19・・
・レベル調整抵抗、21・・・加算器、22・・・過電
圧設定器、23・・・過電圧コンパレータ% 26・・
・第2加算器、27・・・不足電圧設定器、28・・・
不足電圧コンパレ第1図
FIG. 1 is a circuit diagram showing an embodiment of the present invention. 1... DC power supply, 2... Smoothing capacitor, 3...
Transistor inverter as a power conversion device, 4...
- Filter, 5... AC load, 11... Instrument transformer, 13... Voltage setting device, 15... Voltage regulator, 1
6...Pace drive circuit, 17...Current transformer, 19...
・Level adjustment resistor, 21... Adder, 22... Overvoltage setter, 23... Overvoltage comparator % 26...
・Second adder, 27...Undervoltage setter, 28...
Undervoltage comparator diagram 1

Claims (1)

【特許請求の範囲】 電力変換装置の出力側lζ電圧検出回路と電流検出回路
を設け、電圧設定器からの設定電圧信号に前記電流検出
回路からの出力電流信号を加算したものと前記電圧検出
回路からの出力電圧信号とを比較してその偏差を零にす
る制御信号を出力する電圧調節器を備え、前記電力変換
装置と負荷との間の線路電圧降下による負荷の入力電圧
変動を補償するようなされている電力変換装置において
。 過電圧設定器と、該過電圧設定器出力信号と前記出力電
流信号とを加算する力ロ算器と、該加算器が出力する過
電圧設定信号と前記出力電圧信号とを比較する過電圧コ
ンパレータと、不足電圧設定器と、該不足電圧設定器出
力信号と前記出力電流信号とを加算する第2加算器と、
該第2加算器が出力する不足電圧設定信号と前記出力電
圧信号とを比較する不足電圧コンパレータとを備えてな
ることを特徴とする電力変換装置の異常電圧検出回路。
[Scope of Claims] An output side of a power conversion device is provided with a voltage detection circuit and a current detection circuit, and includes a signal obtained by adding an output current signal from the current detection circuit to a set voltage signal from a voltage setting device, and the voltage detection circuit. and a voltage regulator that outputs a control signal that makes the deviation zero by comparing the output voltage signal from the power converter and the output voltage signal, and is configured to compensate for fluctuations in the input voltage of the load due to a line voltage drop between the power converter and the load. In the power conversion device that is used. an overvoltage setting device, a power multiplier that adds the overvoltage setting device output signal and the output current signal, an overvoltage comparator that compares the overvoltage setting signal outputted by the adder and the output voltage signal, and an undervoltage. a setting device; a second adder that adds the undervoltage setting device output signal and the output current signal;
An abnormal voltage detection circuit for a power conversion device, comprising: an undervoltage comparator that compares the undervoltage setting signal output from the second adder with the output voltage signal.
JP59072339A 1984-04-11 1984-04-11 Abnormal voltage detector of power converter Pending JPS60216772A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59072339A JPS60216772A (en) 1984-04-11 1984-04-11 Abnormal voltage detector of power converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59072339A JPS60216772A (en) 1984-04-11 1984-04-11 Abnormal voltage detector of power converter

Publications (1)

Publication Number Publication Date
JPS60216772A true JPS60216772A (en) 1985-10-30

Family

ID=13486436

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59072339A Pending JPS60216772A (en) 1984-04-11 1984-04-11 Abnormal voltage detector of power converter

Country Status (1)

Country Link
JP (1) JPS60216772A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0295173A (en) * 1988-09-29 1990-04-05 Toshiba Corp Uninterruptible power supply

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5713975A (en) * 1980-06-23 1982-01-25 Mitsubishi Electric Corp Control of output voltage for polyphase inverter
JPS58224575A (en) * 1982-04-28 1983-12-26 ゼネラル・エレクトリツク・カンパニイ Protecting system for integrated load commutation inverter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5713975A (en) * 1980-06-23 1982-01-25 Mitsubishi Electric Corp Control of output voltage for polyphase inverter
JPS58224575A (en) * 1982-04-28 1983-12-26 ゼネラル・エレクトリツク・カンパニイ Protecting system for integrated load commutation inverter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0295173A (en) * 1988-09-29 1990-04-05 Toshiba Corp Uninterruptible power supply

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