JPS62123986A - Controller for air conditioner - Google Patents

Controller for air conditioner

Info

Publication number
JPS62123986A
JPS62123986A JP60262415A JP26241585A JPS62123986A JP S62123986 A JPS62123986 A JP S62123986A JP 60262415 A JP60262415 A JP 60262415A JP 26241585 A JP26241585 A JP 26241585A JP S62123986 A JPS62123986 A JP S62123986A
Authority
JP
Japan
Prior art keywords
inverter
commercial
phase power
control circuit
air conditioner
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
JP60262415A
Other languages
Japanese (ja)
Inventor
Takashi Kato
喬 加藤
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP60262415A priority Critical patent/JPS62123986A/en
Publication of JPS62123986A publication Critical patent/JPS62123986A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Landscapes

  • Air Conditioning Control Device (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

PURPOSE:To conduct smooth operation even on inverter-down by providing a means changing over an output from an inverter and a commercial three-phase power supply. CONSTITUTION:A commercial three-phase power supply 1 is inputted to an inverter 4 through a contact 2 for an electromagnetic relay 7 controlled by a control circuit 6. The output side 41 of the inverter 4 is connected to a compressor 5. The compressor 5 is further connected to the commercial three-phase power supply 1 through a contact 3 for an electromagnetic relay 8 controlled by the control circuit 6. When the inverter 4 gets trouble for some factor, operation is changed over to commercial three-phase power-supply operation, and an air conditioner is ON-OFF controlled in response to room temperature. Accordingly, reliability as a system is improved.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は、空気調和機の特にインバータを用いて圧縮機
の回転数を可変制御する制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a control device for variably controlling the rotational speed of an air conditioner, particularly a compressor using an inverter.

〔発明の背景〕[Background of the invention]

インバータを用いて圧縮機の容量制御をする場合にイン
バータに使用している素子の定格から定まるインバータ
容格以上には出ないため、過負荷時には周波数を下げて
運転するとか停止していた。なお、この種の装置として
関連するもの［Ｉｄ例えば特開昭５９−１３２７７９号
、同５７−６７７３５等が挙げられる。そして、特開昭
５９−１３２７７９には過負荷になると徐々に周波数を
下げていき、それでも過負荷が続くとインバータを停止
してしまうことが開示されている。この技術によれば、
インバータの保護はできる。しかし、ユーザーが要求し
ているのけ運転の続行であることを認識していないし、
特にインバータダウン後のバックアップについては考慮
されていない。When using an inverter to control the capacity of a compressor, the inverter capacity cannot be exceeded, which is determined by the rating of the elements used in the inverter, so in the event of an overload, the compressor must be operated at a lower frequency or stopped. Incidentally, related devices of this type [Id, for example, Japanese Patent Application Laid-Open Nos. 59-132779 and 57-67735, etc. can be mentioned. JP-A-59-132779 discloses that when an overload occurs, the frequency is gradually lowered, and if the overload continues, the inverter is stopped. According to this technology,
The inverter can be protected. However, they do not realize that the user is requesting to continue driving,
In particular, no consideration is given to backup after the inverter goes down.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、インバータダウン時においても快適な
運転ができる空気調和機の制御装置を提供することにあ
る。An object of the present invention is to provide a control device for an air conditioner that allows comfortable operation even when the inverter is down.

〔発明の概要〕[Summary of the invention]

本発明はインバータＶＣよる矩形波駆動より商用三相電
源による正弦波駆動の方が効率が良いことに基づいて、
インバータの出力容量が小さくとも過負荷時の運転範囲
が拡げられるように考えたもので、インバータの入力側
の商用三相電源に切換え手段を介して、前記インバータ
と圧縮機を並列に接続し、制御回路からの指令により必
要に応じて、前記インバータによる回転数制御運転と商
用三相電源による定速度運転を選択できるように構成し
たことを特徴とする。The present invention is based on the fact that sine wave drive using a commercial three-phase power supply is more efficient than rectangular wave drive using an inverter VC.
It was designed to expand the operating range during overload even if the output capacity of the inverter is small, and the inverter and compressor are connected in parallel to the commercial three-phase power supply on the input side of the inverter via a switching means. The present invention is characterized in that it is configured such that rotation speed control operation using the inverter and constant speed operation using a commercial three-phase power source can be selected as required by a command from a control circuit.

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

以下、本発明の一実施例を第１図乃至第４図により説明
する。商用三相電源１；ｊ制御回路６で制御される電磁
リレー７の接点２を介してインバータ４Ｖこ入力されて
いる。インバータ４の出力側４１け圧縮機５に接続され
ている。圧縮機５にはさらに制御回路６で制御される電
磁リレー８の接点３を介して、前記商用三相電源１に接
続されている。１２．１３はモータ電流検出器である。An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. A commercial three-phase power supply 1; 4V is input to an inverter via a contact 2 of an electromagnetic relay 7 controlled by a control circuit 6. The output side of the inverter 4 is connected to the 41 compressor 5. The compressor 5 is further connected to the commercial three-phase power supply 1 via the contacts 3 of an electromagnetic relay 8 controlled by a control circuit 6. 12.13 is a motor current detector.

第２図げ第１図の回路の動きを表したもので、エエ、が
インバータ４の制限電流、”ＭＰがモータの制限電流で
あり、ＩＭＰ≧’ＩＰの関係がある。動作は制御回路６
の内部接点１０が動作して電ｉ１ＪレーアがＯＮして接
点２が閉じているときは制御回路６からの指令周波数で
インバータ４により圧縮機５が回転していてＡモードと
なるが、い１負荷の状態がかわって、インバータ４０出
力′成流が”ＩＰを超えるとまずインバータ４ｔ：を周
波数を下げていって商用周波数でも■ＩＦを超えるとき
ＶＣｆｉ制脚回路は電磁リレー７をＯＦ’Ｆ’して電磁
リレー８を内部力接点１１によりＯＮする。こうすると
接点２は開となり、接点３が閉じ、圧縮機５には商用三
相電源１が印加されて定速運転となる。これをＢモード
とする。次に定速運転を続行しているうちに負荷が増々
重くなり、圧縮機電流Ｉｃがモータ制呻電流ＩＭＰｖｃ
達するとＣモードとなる。Ｃモードでは商用周波数以下
で運４転するか、停止するかのどちらかになる。第３図
はこの動作を７０−チャートで示したものである。イン
バータ４ならびにモータ電流の検知手段および位Ｗ、に
ついては公知のどんな手段でも良い。またＡ、Ｂ、Ｃモ
ードの切換時にはヒスリシスまたはタイマなどでオン、
オフの頻度を減らし、ハンチングを防止することもでき
る。モータをインバータ４で駆動した場合と商用電源で
駆動した場合での効率は後者が数多高い。このため本実
施例によれば過負荷時ＶＣはモータの能力を精一杯利用
できるという効果がある。Figure 2 shows the operation of the circuit in Figure 1, where A is the limited current of the inverter 4, MP is the limited current of the motor, and there is a relationship of IMP≧IP.The operation is performed by the control circuit 6.
When the internal contact 10 of 1 is operated, the electric i1J layer is turned on, and the contact 2 is closed, the compressor 5 is rotated by the inverter 4 at the command frequency from the control circuit 6, and the mode is A1. When the load condition changes and the inverter 40 output's current exceeds IP, the frequency of the inverter 4t is lowered, and when it exceeds IF even at the commercial frequency, the VCfi leg control circuit turns the electromagnetic relay 7 OFF'. ' and turns on the electromagnetic relay 8 using the internal force contact 11. In this way, the contact 2 is opened and the contact 3 is closed, and the commercial three-phase power supply 1 is applied to the compressor 5, resulting in constant speed operation. Set to B mode.Next, as the constant speed operation continues, the load becomes heavier and the compressor current Ic increases to the motor suppressing current IMPvc.
When it reaches this point, it becomes C mode. In C mode, the engine either operates at a frequency below the commercial frequency or stops. FIG. 3 shows this operation in a 70-chart. Any known means may be used for the inverter 4 and the motor current detection means and position W. Also, when switching between A, B, and C modes, turn on hysteresis or timer, etc.
It is also possible to reduce the frequency of turning off and prevent hunting. When the motor is driven by the inverter 4 and when it is driven by a commercial power source, the efficiency is much higher in the latter case. Therefore, according to this embodiment, there is an effect that the VC can utilize the motor's capacity to the fullest during overload.

また、インバータ４が何らかの要因でダウンしたときけ
、商用三相電源運転に切換え、かつ第４図に示すように
室内温度に応じて０Ｎ−ＯＦＦ制御をすることにより、
システムとしての信頼性が向上するという効果もある。In addition, when the inverter 4 goes down for some reason, it switches to commercial three-phase power supply operation and performs ON-OFF control according to the indoor temperature as shown in Figure 4.
This also has the effect of improving the reliability of the system.

第５図は他の実施例を示したもので、第１図の動作をフ
ローチャートで表わしたもので、異常な電流、電圧、動
作を検出した場合に第１図では図示していない保護回路
が動作してインバータが停止する。このとき電磁リレー
５２Ｃ１がオフ、５２Ｃ２がＯＮとなり、インバータ４
０入力電源が切り離されて商用三相電源１が直接圧縮機
５に接続されることになる。異常が検知されない場合は
インバータ運転を続行することになる。インバータ４か
ら切離して商用三相電源運転中はバックアップ機能のた
め連続運転でも良いが、連続運転の場合には暖めすぎ、
冷えすぎとなって快適性が損なわれる。このため第４図
に示すように、設定値Ｔ２となったら５２０２オン、Ｔ
１となったら５２０２オフというような温度調節運転の
機能を制御回路に内蔵すれば良い。インバータ運転と商
用三相電源との切り分けをこ力例でケミ磁すレーで行っ
たが、他の手段でも良い。また場所もインバータの出力
側でも良い。この実施例によればインバータダウ／時に
も空調機の運転が自動的に可能となるなどの効果があり
、インバータダウン時にも温調運転ができる。この実施
例によれば、インバータダウン時にも空気調和機の運転
ができるので、（１）　　事故回復時間が短かい。Fig. 5 shows another embodiment, which is a flowchart representing the operation of Fig. 1. When abnormal current, voltage, or operation is detected, a protection circuit not shown in Fig. It operates and the inverter stops. At this time, electromagnetic relay 52C1 is turned off, 52C2 is turned on, and inverter 4
The zero input power source is disconnected and the commercial three-phase power source 1 is directly connected to the compressor 5. If no abnormality is detected, inverter operation will continue. When disconnected from the inverter 4 and running on a commercial three-phase power supply, it can be operated continuously due to the backup function, but in the case of continuous operation, it may become too warm.
It becomes too cold and comfort is impaired. Therefore, as shown in Fig. 4, when the set value T2 is reached, 5202 is turned on and T
It is sufficient to incorporate a temperature control operation function in the control circuit, such as turning off the 5202 when the value becomes 1. In this example, the separation between inverter operation and commercial three-phase power supply was done using a chemical magnet, but other means may be used. Also, the location may be on the output side of the inverter. According to this embodiment, there is an effect that the air conditioner can be automatically operated even when the inverter is down, and temperature control operation can be performed even when the inverter is down. According to this embodiment, since the air conditioner can be operated even when the inverter is down, (1) accident recovery time is short.

（２）　　システムとしての信頼性が向上する。(2) The reliability of the system is improved.

などの他に、温調運転機能により （３）バックアップ時でも快適性を保てる。In addition to the above, the temperature control operation function (3) Comfort can be maintained even during backup.

などの効果がある。There are effects such as

〔発明の効果〕〔Effect of the invention〕

本発明によれば、モータの能力を十分に利用できるため
、 （１）過負荷時の運転範囲が拡げられる。According to the present invention, since the capacity of the motor can be fully utilized, (1) the operating range during overload can be expanded;

（２）　　インバータが比較的小さくできるため経済的
にも有利。(2) Economically advantageous as the inverter can be made relatively small.

などの他にインバータダウン時にも商用電源で運転でき
るため （３）　　システムとしての信頼性が向上する。In addition, the system can be operated on commercial power even when the inverter is down, which improves the reliability of the system (3).

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

第１図は本発明の回路図、第２図は第１図の動作説明図
、第３図はフローチャート、第４図はバックアップ時の
圧縮機動作図である。第５図は他の実施例を示すフロー
チャートである。 １・・・商用三相電＃　　２・・・電磁リレー７の接点
３・・・電磁リレー８の接点　　４・・・インバータ５
・・・圧縮機　　６・・・制御回路　　７．８・・・電
磁リレー　　９・・・単相電源　　１ｏｌｌ・・・制御
回路内部接点。 ヰ１の ス ネ２０ 覇 モー［パ区分 弓５圓FIG. 1 is a circuit diagram of the present invention, FIG. 2 is an explanatory diagram of the operation of FIG. 1, FIG. 3 is a flowchart, and FIG. 4 is a diagram of compressor operation during backup. FIG. 5 is a flowchart showing another embodiment. 1... Commercial three-phase power #2... Contact of electromagnetic relay 7 3... Contact of electromagnetic relay 8 4... Inverter 5
... Compressor 6 ... Control circuit 7.8 ... Electromagnetic relay 9 ... Single-phase power supply 1oll ... Control circuit internal contact.ヰ1 shin 20 hamo [Pa division bow 5 circles

Claims (1)

【特許請求の範囲】 １、商用三相電源にインバータが接続され、このインバ
ータによって圧縮機の回転数を連続的に可変制御する制
御回路を有した空気調和機において、前記インバータの
入力側の商用三相電源に切換え手段を介して前記インバ
ータと圧縮機を並列に接続し、前記制御回路からの指令
により必要に応じて、前記インバータによる回転数制御
運転と商用三相電源による定速度運転を選択できるよう
にしたことを特徴とする空気調和機の制御装置。 ２、制御回路が、商用三相電源による定速度運転中のモ
ータ電流を検出できる回路を備えた特許請求の範囲第１
項記載の空気調和機の制御装置。 ３、制御回路が、インバータダウン時には商用三相電源
運転に切換えて、かつサーモ運転ができる回路を備えた
特許請求の範囲第１項記載の空気調和機の制御装置。 ４、制御回路が、商用三相電源による運転中は温度によ
り圧縮機をオン、オフできる回路を備えた特許請求の範
囲第１項記載の空気調和機の制御回路。[Scope of Claims] 1. In an air conditioner having a control circuit in which an inverter is connected to a commercial three-phase power supply and the inverter continuously variably controls the rotation speed of a compressor, the commercial The inverter and the compressor are connected in parallel to a three-phase power source via a switching means, and a rotation speed control operation by the inverter and a constant speed operation by the commercial three-phase power source are selected as necessary according to a command from the control circuit. An air conditioner control device characterized by being able to 2. Claim 1, wherein the control circuit includes a circuit that can detect the motor current during constant speed operation using a commercial three-phase power supply.
A control device for an air conditioner as described in Section 1. 3. The control device for an air conditioner according to claim 1, wherein the control circuit is equipped with a circuit that can switch to commercial three-phase power supply operation when the inverter is down and perform thermo-operation. 4. The control circuit for an air conditioner according to claim 1, wherein the control circuit includes a circuit that can turn on and off the compressor depending on the temperature during operation using a commercial three-phase power source.
JP60262415A 1985-11-25 1985-11-25 Controller for air conditioner Pending JPS62123986A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60262415A JPS62123986A (en) 1985-11-25 1985-11-25 Controller for air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60262415A JPS62123986A (en) 1985-11-25 1985-11-25 Controller for air conditioner

Publications (1)

Publication Number Publication Date
JPS62123986A true JPS62123986A (en) 1987-06-05

Family

ID=17375466

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60262415A Pending JPS62123986A (en) 1985-11-25 1985-11-25 Controller for air conditioner

Country Status (1)

Country Link
JP (1) JPS62123986A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01131843A (en) * 1987-11-13 1989-05-24 Toshiba Corp Air conditioner
JPH01147269A (en) * 1987-12-04 1989-06-08 Daikin Ind Ltd Emergency controller for air conditioner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01131843A (en) * 1987-11-13 1989-05-24 Toshiba Corp Air conditioner
JPH01147269A (en) * 1987-12-04 1989-06-08 Daikin Ind Ltd Emergency controller for air conditioner

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