JPH04145893A - Controlling circuit for inverter - Google Patents

Controlling circuit for inverter

Info

Publication number
JPH04145893A
JPH04145893A JP2268349A JP26834990A JPH04145893A JP H04145893 A JPH04145893 A JP H04145893A JP 2268349 A JP2268349 A JP 2268349A JP 26834990 A JP26834990 A JP 26834990A JP H04145893 A JPH04145893 A JP H04145893A
Authority
JP
Japan
Prior art keywords
inverter
voltage
frequency
pwm
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.)
Pending
Application number
JP2268349A
Other languages
Japanese (ja)
Inventor
Chihiro Okatsuchi
千尋 岡土
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.)
Toshiba Corp
Toshiba FA Systems Engineering Corp
Original Assignee
Toshiba Corp
Toshiba FA Systems Engineering Corp
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 Toshiba Corp, Toshiba FA Systems Engineering Corp filed Critical Toshiba Corp
Priority to JP2268349A priority Critical patent/JPH04145893A/en
Publication of JPH04145893A publication Critical patent/JPH04145893A/en
Pending legal-status Critical Current

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  • Ac-Ac Conversion (AREA)
  • Inverter Devices (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

PURPOSE:To reduce the noise of a motor without raising the switching frequency of an inverter by reducing the distortion of an electric current by controlling an input current to a sine wave-like shape and partially controlling a DC voltage in accordance with the setting of frequency to the inverter. CONSTITUTION:A DC voltage is raised to its rated value and the percentage modulation of PWM and the voltage of an inverter are respectively raised to the highest values at the point where the frequency of the inverter is (b). During the period when the frequency of the inverter changes from (a) to (b), the voltage of the inverter is linearly changed by controlling a DC voltage proportionally to the frequency of the inverter while the percentage modulation of PWM is maintained at the highest value. When the frequency of the inverter is lower than (a), the voltage of the inverter is dropped by lowering the percentage modulation of PWM while the DC voltage is maintained at a fixed level. In addition, the lowest value of the DC voltage is set to a value a little higher than the peak value of an input AC voltage. Therefore, the efficiency can be improved and, at the same time, the noise of a motor caused by a ripple current can be reduced, because the PWM is performed by dropping the DC voltage and the ripple current is reduced by about 1/2 within the lowfrequency range of the inverter.

Description

【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本発明は、空調装置駆動用のインバータの制御回路に関
するものである。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a control circuit for an inverter for driving an air conditioner.

（従来の技術） 従来の空調装置（エアコン）用インバータの主回路およ
び制御回路の一例を第４図に示す。(Prior Art) FIG. 4 shows an example of a main circuit and a control circuit of a conventional inverter for an air conditioner.

第４図において、交流（１００Ｖ）電源１は整流器２ａ
、　２ｂとコンデンサ３ａ、　３ｂから成る倍電圧整流
回路を介して約ＤＣ２８０Ｖの直流電圧に変換され、コ
ンデンサ４で平滑にされ、さらにＰＷＭ（パルス幅変調
）制御のトランジスタインバータ５を介して可変電圧可
変周波数の交流に変換されて電動機６を駆動する。In Fig. 4, an AC (100V) power supply 1 is connected to a rectifier 2a.
, 2b and capacitors 3a and 3b to a direct current voltage of about 280 VDC, smoothed by a capacitor 4, and further changed to a variable voltage via a PWM (pulse width modulation) controlled transistor inverter 5. The frequency is converted into alternating current to drive the electric motor 6.

インバータ周波数の制御は、温度センサ７で室温を検出
し、マイクロプロセッサ８を介してインバータ周波数指
令をＰＷＭ回路９に出力し、ＰＷＭ回路９からのＰＷＭ
信号によってトランジスタインバータ５を駆動する。The inverter frequency is controlled by detecting the room temperature with a temperature sensor 7, outputting an inverter frequency command to a PWM circuit 9 via a microprocessor 8, and
The transistor inverter 5 is driven by the signal.

従来は空調装置を駆動するインバータ回路の周波数ｆと
電圧■を、第５図に示すようにＶ／ｆ比がほぼ一定にな
るように制御している。Conventionally, the frequency f and voltage (2) of an inverter circuit that drives an air conditioner are controlled so that the V/f ratio is approximately constant as shown in FIG.

（発明が解決しようとする課題） 現在の空調用インバータ回路のＰＷＭスイッチンク周波
数は１ｋＨｚ〜２ｋＨｚ程度であり、このスイッチング
周波数によって電動機に騒音が発生し、特に夜間の安眠
運転時の騒音が問題となっている。(Problem to be solved by the invention) The PWM switching frequency of current air conditioning inverter circuits is about 1 kHz to 2 kHz, and this switching frequency generates noise in the motor, and noise is especially a problem during sleepy operation at night. It has become.

また第４図に示す従来の回路はコンデンサインプット形
の整流回路を用いているので、第３．第５、第７高調波
電流成分が基本波電流成分と同レベルとなり、電源波形
をみだし好ましくないので、最近は昇圧チョッパ回路を
用いて入力電流を正弦波に近づけることが行われている
。Furthermore, since the conventional circuit shown in FIG. 4 uses a capacitor input type rectifier circuit, the third. The 5th and 7th harmonic current components are at the same level as the fundamental wave current component, which is undesirable because they overflow the power supply waveform.Recently, a step-up chopper circuit has been used to bring the input current closer to a sine wave.

本発明は、昇圧チョッパを使用した空調装置駆動用のイ
ンバータにおいて、特に夜間の安眠運転時にインバータ
の周波数を低下させたときの電動機の騒音を比較的高い
効率を保持したままで低下させる空調用インバータの制
御回路を提供することを目的としている。The present invention relates to an inverter for driving an air conditioner using a boost chopper, which reduces the noise of the electric motor while maintaining relatively high efficiency, especially when the frequency of the inverter is lowered during sleepy operation at night. The purpose is to provide a control circuit for

〔発明の構成〕[Structure of the invention]

（課題を解決するための手段と作用） 本発明は、空調装置駆動用インバータの整流回路に昇圧
チョッパ機能をもたせると共に、インバータ周波数が低
いときは整流直流電圧を低く制御することによって、Ｐ
ＷＭに起因する高調波電流を減少させ静かな電動機駆動
を行うものであり、インバータ周波数が所定値以上のと
きは、ＰＷＭの変調率を最高に設定して直流電圧を可変
すると共に、インバータ周波数が所定値以下の範囲にあ
ることにより、ＰＷＭに伴う高調波電流を低減させ、高
調波電流に起因する騒音を低下させるものである。(Means and effects for solving the problems) The present invention provides a step-up chopper function to the rectifier circuit of an inverter for driving an air conditioner, and controls the rectified DC voltage to be low when the inverter frequency is low.
This system reduces harmonic current caused by WM to drive a quiet motor, and when the inverter frequency is above a predetermined value, the PWM modulation rate is set to the highest and the DC voltage is varied, and the inverter frequency is By being within the range of a predetermined value or less, harmonic current associated with PWM is reduced, and noise caused by the harmonic current is reduced.

（実施例） 本発明の一実施例を第１図に示す。第４図と同一部分に
は同一番号を付し、その説明を省略している。(Example) An example of the present invention is shown in FIG. The same parts as in FIG. 4 are given the same numbers and their explanations are omitted.

第１図において、交流電源（１００Ｖ）ｌはリアクトル
１０を介してＩ　Ｇ　Ｂ　Ｔｌｌ、　１２およびダイオ
ード２ａ、　２ｂから成る昇圧チョッパに供給される。In FIG. 1, an AC power source (100V) is supplied via a reactor 10 to a boost chopper consisting of an IGBTll, 12 and diodes 2a, 2b.

マイクロプロセッサ８は温度センサ７の出力に応じてイ
ンバータ周波□数基準をＰＷＭ回路９へ与えると共に、
直流電圧基準を電圧制御回路１３に入力し、コンデンサ
４の電圧と比較増幅して電流基準を出力し、この電流基
準と変流器１Ｇの出力とを電流制御回路１４で比較増幅
し、ＰＷＭ制御回路１５を介して昇圧チョッパのＩ　Ｇ
　Ｂ　Ｔｌｌ、　１２をＰＷＭ制御する。The microprocessor 8 provides an inverter frequency reference to the PWM circuit 9 according to the output of the temperature sensor 7, and
A DC voltage reference is input to the voltage control circuit 13, compared and amplified with the voltage of the capacitor 4, and a current reference is output.This current reference and the output of the current transformer 1G are compared and amplified in the current control circuit 14, and PWM control is performed. IG of the boost chopper via circuit 15
B Tll, 12 is controlled by PWM.

すなわち、電圧制御回路１３、電流制御回路１４、ＰＷ
Ｍ回路１５、リアクトル１０、変流器１６、ＩＧＢＴｌ
ｌ、　１２、ダイオード２ａ、　２ｂ、およびコンデン
サ４によって昇圧コンバータを形成し、交流入力電流を
正弦波にＰＷＭ制御し、直流出力電圧（コンデンサ４両
端子間電圧）を一定に制御する。That is, the voltage control circuit 13, the current control circuit 14, the PW
M circuit 15, reactor 10, current transformer 16, IGBTl
1, 12, diodes 2a and 2b, and capacitor 4 form a step-up converter, perform PWM control on the AC input current to a sine wave, and control the DC output voltage (voltage between the terminals of the capacitor 4) to be constant.

交流入力電圧１００Ｖ　Ａ　Ｃに対して直流出力電圧は
約２８０Ｖ　Ｄ　Ｃに制御され、これによってインバー
タ出力は交流２００ｖ　に制御される。For an AC input voltage of 100V AC, the DC output voltage is controlled to approximately 280V DC, thereby controlling the inverter output to AC 200V.

またインバータ周波数を変えるときは、上記直流出力電
圧およびインバータ出力電圧は第２図のように制御され
る。Furthermore, when changing the inverter frequency, the DC output voltage and the inverter output voltage are controlled as shown in FIG.

一般に、インバータ電圧ＶＡＣと直流入力電圧ｖＤｃと
の間には ＶＡＣ＝　ｋ−Ｍ−Ｖｏｃ ここに■Ａｃ・・・インバータ電圧 ｋ・・・定数 Ｍ・・・変調率　Ｍ≦１ Ｖｏｃ・・・直流電圧 の関係があり、本発明ではインバータ周波数がｂの点で
直流電圧を定格値（２８０Ｖ）にし、ＰＷＭ変調変調率
量高にしてインバータ電圧を最高にする。Generally, between the inverter voltage VAC and the DC input voltage vDc, VAC=k-M-Voc where ■Ac...Inverter voltage k...Constant M...Modulation rate M≦1 Voc...DC There is a voltage relationship, and in the present invention, the DC voltage is set to the rated value (280V) at the point where the inverter frequency is b, and the PWM modulation rate is set high to maximize the inverter voltage.

インバータ周波数がｂ→ａの間はＰＷＭ変調変調率量高
にしたまま、直流電圧をインバータ周波数に比例しで制
御し、インバータ電圧を直線的に変化させる。While the inverter frequency is from b to a, the PWM modulation modulation rate remains high, and the DC voltage is controlled in proportion to the inverter frequency to linearly change the inverter voltage.

インバータ周波数がａ以下では、直流電圧を一定とし、
ＰＷＭ変調率を下げてインバータ電圧を低下させる。ま
た直流電圧の最低値は、交流入力電圧のピーク値より少
し高い値（約１５０ｖ程度、これ以下では制御不能）に
設定される。When the inverter frequency is below a, the DC voltage is constant,
Lower the inverter voltage by lowering the PWM modulation rate. Further, the lowest value of the DC voltage is set to a value slightly higher than the peak value of the AC input voltage (approximately 150 V, below which control is impossible).

以上のように、インバータの広い周波数範囲でＰＷＭ変
調変調率量高に保持することによって入力力率が１で電
流歪のほとんど無い良質の出力が得られ、またインバー
タ周波数の低い範囲では直流電圧を下げてＰＷＭを行っ
ているのでリップル電 リップル電流に起因する電動機騒音を著しく減少させる
ことができる。As described above, by keeping the PWM modulation rate high over a wide frequency range of the inverter, a high-quality output with an input power factor of 1 and almost no current distortion can be obtained, and in the low frequency range of the inverter, a high-quality output with almost no current distortion can be obtained. Since PWM is performed by lowering the ripple current, motor noise caused by ripple current can be significantly reduced.

電動機のリップル電流は、直流電圧が一定の場合は変調
率Ｍが０．５附近が最高になり、Ｍ岬ＯＭ４を附近は少
なくなる。Ｍが一定の場合は、直流電圧にほぼ比例して
増加する。When the DC voltage is constant, the ripple current of the motor is highest when the modulation factor M is around 0.5, and becomes smaller near the M cape OM4. When M is constant, it increases approximately in proportion to the DC voltage.

一般に家庭用のエアコンでは、夜間は安眠運転として冷
却作用を弱めるので、インバータの周波数は第２図のａ
附近となり、電動機の騒音は著しく低減される。Generally, in a household air conditioner, the cooling effect is weakened at night to allow sleep operation, so the frequency of the inverter is set to a in Figure 2.
The noise from the electric motor is significantly reduced.

なお、第２図では直流電圧をａ　−ｂ間で直線的に変化
させているが段階的に変化させることも可能である。In addition, although the DC voltage is changed linearly between a and b in FIG. 2, it is also possible to change it stepwise.

また、昇圧チョッパ回路方式としては第３図（Ａ）、　
（Ｂ）、　（Ｃ）の何れの方式を用いてもよく、何れの
場合にも力率１の制御が可能である。In addition, as a boost chopper circuit system, Fig. 3 (A),
Either method (B) or (C) may be used, and control with a power factor of 1 is possible in either case.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明によれば、入力室流を正弦波
状に制御して電流歪を減少させると共に、インバータの
周波数設定に応じて直流電圧を部分的に制御しているの
で、電動機に流れる高調波電流分を減少させて効率を改
善できると共に、インバータのスイッチング周波数を上
昇させるこることができ、特に夜間のインバータエアコ
ンの安眠運転時の効率よい騒音低下が可能となる。As explained above, according to the present invention, the input chamber current is controlled sinusoidally to reduce current distortion, and the DC voltage is partially controlled according to the frequency setting of the inverter, so that the current flowing to the motor is Efficiency can be improved by reducing harmonic current components, and the switching frequency of the inverter can be increased, making it possible to effectively reduce noise, especially when the inverter air conditioner is operating in a sleepy manner at night.

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

第１図は本発明の一実施例を示す回路図、第２図は第１
図の動作を説明するためのタイムチャート、第３図は本
発明に用いられる昇圧チョッパの各種回路例を示す図、
第４図は従来インバータの回路図、第５図は従来回路に
おけるインバータ電圧と周波数との関係を示す特性図で
ある。 １・・・交流電源　　　　　　　２ａ、　２ｂ・・・整
流器３ａ、　３ｂ、　４・・コンデンサ ５・・・トランジスタインバータ ６・・電動機　　・　　　　　７・温度センサ８・マイ
クロプロセッサ　９，１５・ＰＷＭ回路１０・・リアク
トル １１゜ １２・・・ＩＧＢＴ１３ ・・・電圧制御回路 １４・・・電流制御回路 １６・・・変流器 （８７３３）代理人弁理士 猪 股 祥 晃（ほか１名） 第 図 第 図 第 図 第 第 図Fig. 1 is a circuit diagram showing one embodiment of the present invention, and Fig. 2 is a circuit diagram showing an embodiment of the present invention.
3 is a diagram showing various circuit examples of the boost chopper used in the present invention,
FIG. 4 is a circuit diagram of a conventional inverter, and FIG. 5 is a characteristic diagram showing the relationship between inverter voltage and frequency in the conventional circuit. 1... AC power supply 2a, 2b... Rectifier 3a, 3b, 4... Capacitor 5... Transistor inverter 6... Motor 7. Temperature sensor 8. Microprocessor 9, 15. PWM circuit 10... Reactor 11゜12...IGBT13...Voltage control circuit 14...Current control circuit 16...Current transformer (8733) Attorney Yoshiaki Inomata (and 1 other person) figure

Claims (1)

【特許請求の範囲】[Claims] 交流電源電圧をＰＷＭ制御の昇圧チョッパを介して直流
電圧に変換し、ＰＷＭ制御のインバータを介して空調装
置用電動機を駆動するインバータの制御回路において、
インバータ周波数が所定値より高い範囲ではインバータ
用ＰＷＭの変調率を最大にしてインバータ電圧を直流電
圧にほぼ比例して制御すると共に、インバータ周波数が
所定値より低い範囲では直流電圧を一定とし、インバー
タ用ＰＷＭの変調率を変化させてインバータ電圧をイン
バータ周波数にほぼ比例して制御することを特徴とする
インバータの制御回路。In an inverter control circuit that converts AC power supply voltage into DC voltage via a PWM-controlled step-up chopper and drives an air conditioner motor via a PWM-controlled inverter,
In the range where the inverter frequency is higher than a predetermined value, the modulation rate of the inverter PWM is maximized to control the inverter voltage almost in proportion to the DC voltage, and in the range where the inverter frequency is lower than the predetermined value, the DC voltage is kept constant and the inverter An inverter control circuit characterized by controlling an inverter voltage substantially in proportion to an inverter frequency by changing a PWM modulation rate.
JP2268349A 1990-10-08 1990-10-08 Controlling circuit for inverter Pending JPH04145893A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2268349A JPH04145893A (en) 1990-10-08 1990-10-08 Controlling circuit for inverter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2268349A JPH04145893A (en) 1990-10-08 1990-10-08 Controlling circuit for inverter

Publications (1)

Publication Number Publication Date
JPH04145893A true JPH04145893A (en) 1992-05-19

Family

ID=17457301

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2268349A Pending JPH04145893A (en) 1990-10-08 1990-10-08 Controlling circuit for inverter

Country Status (1)

Country Link
JP (1) JPH04145893A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007120367A (en) * 2005-10-26 2007-05-17 Matsushita Electric Works Ltd Pump and liquid supply device using the same
WO2013153571A1 (en) * 2012-04-10 2013-10-17 富士電機株式会社 Power conversion device
JP5903636B2 (en) * 2010-02-26 2016-04-13 パナソニックＩｐマネジメント株式会社 Power conversion device, grid interconnection device, and grid interconnection system
WO2019049246A1 (en) * 2017-09-06 2019-03-14 株式会社日立産機システム Power conversion device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007120367A (en) * 2005-10-26 2007-05-17 Matsushita Electric Works Ltd Pump and liquid supply device using the same
JP4706437B2 (en) * 2005-10-26 2011-06-22 パナソニック電工株式会社 Pump and liquid supply apparatus using the same
JP5903636B2 (en) * 2010-02-26 2016-04-13 パナソニックＩｐマネジメント株式会社 Power conversion device, grid interconnection device, and grid interconnection system
WO2013153571A1 (en) * 2012-04-10 2013-10-17 富士電機株式会社 Power conversion device
JP5565527B2 (en) * 2012-04-10 2014-08-06 富士電機株式会社 Power converter
US9571001B2 (en) 2012-04-10 2017-02-14 Fuji Electric Co., Ltd. Power conversion device, including serial switching element, that compensates for voltage fluctuations
WO2019049246A1 (en) * 2017-09-06 2019-03-14 株式会社日立産機システム Power conversion device
US11050360B2 (en) 2017-09-06 2021-06-29 Hitachi Industrial Equipment Systems Co., Ltd. Power conversion device

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