JP2002058254A - Current detector circuit for air conditioner - Google Patents
Current detector circuit for air conditionerInfo
- Publication number
- JP2002058254A JP2002058254A JP2000239711A JP2000239711A JP2002058254A JP 2002058254 A JP2002058254 A JP 2002058254A JP 2000239711 A JP2000239711 A JP 2000239711A JP 2000239711 A JP2000239711 A JP 2000239711A JP 2002058254 A JP2002058254 A JP 2002058254A
- Authority
- JP
- Japan
- Prior art keywords
- current
- circuit
- acct
- air conditioner
- power supply
- 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
Links
Landscapes
- Control Of Ac Motors In General (AREA)
- Air Conditioning Control Device (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Inverter Devices (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は空気調和機のPWM
インバータ電力変換回路を有した機器の電流検出回路に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PWM for an air conditioner.
The present invention relates to a current detection circuit of a device having an inverter power conversion circuit.
【0002】[0002]
【従来の技術】従来PWMインバータ制御回路を有した
製品の電流検出回路は、図5に示すように電源とパワー
素子の間に検出用の抵抗を取り付けて抵抗に流れる電流
を電圧に変換する構成が一般的であった。2. Description of the Related Art A conventional current detection circuit of a product having a PWM inverter control circuit has a structure in which a detection resistor is attached between a power supply and a power element and a current flowing through the resistor is converted into a voltage as shown in FIG. Was common.
【0003】またこの検出した電圧を低圧の制御信号に
取り込むにはパワー部の直流高電圧を高価なフォトカプ
ラ等で絶縁する必要があった。In order to incorporate the detected voltage into a low-voltage control signal, it is necessary to insulate the high DC voltage of the power section with an expensive photocoupler or the like.
【0004】さらに、コンプレッサーの電流を検出して
空気調和機の制御を行う場合は低周波数でも飽和しない
DCCTを使用するのが一般的であった。Further, when controlling the air conditioner by detecting the current of the compressor, it is common to use DCCT which does not saturate even at a low frequency.
【0005】[0005]
【発明が解決しようとする課題】しかしながら、上記従
来の構成ではフォトカプラを動作させる電圧を得るため
の抵抗値を最低に選定しても空気調和機器運転時は抵抗
による発熱損失が3〜4W程度発生し、近年の省エネル
ギーに反する回路構成となっていた。また回路を絶縁す
るための部品も必ず必要であり、新たな代替回路が要求
されていた。However, in the above-described conventional configuration, even when the resistance value for obtaining the voltage for operating the photocoupler is selected to be the minimum, the heat loss due to the resistance during the operation of the air conditioner is about 3 to 4 W. This has resulted in a circuit configuration that is contrary to energy conservation in recent years. In addition, parts for insulating the circuit are always required, and a new alternative circuit is required.
【0006】これを解決する部品としてはホール素子を
内臓し直流電流でも飽和しないDCCTがあるが、回路
構成が複雑で高価なため空気調和機では採用されていな
い。同様にコンプレッサ電流を検出して高度な空気調和
機の制御を行うことも検出器のコストが問題となってい
た。As a component for solving this problem, there is a DCCT which incorporates a Hall element and does not saturate even with a direct current, but is not employed in an air conditioner due to its complicated and expensive circuit configuration. Similarly, detecting a compressor current to control an advanced air conditioner also has a problem with the cost of the detector.
【0007】本発明は上記のような問題点を解消するた
めになされたもので,省エネルギー化と安価な電流検出
回路を提供することを目的とする。The present invention has been made to solve the above-described problems, and has as its object to provide an energy-saving and inexpensive current detection circuit.
【0008】[0008]
【課題を解決するための手段】上記課題を解決するため
に本願発明は、一般的に50/60Hz交流入力電流の
検出を目的とした汎用のカレントトランス(ACCT)
を直流平滑電源回路の正極または負極のいずれか取り付
け、電力変換回路でPWM制御された直流パルス電流を
ACCTにより直流のパルス電流として検出するもので
ある。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention generally relates to a general-purpose current transformer (ACCT) for detecting an AC input current of 50/60 Hz.
Is attached to either the positive electrode or the negative electrode of the DC smoothing power supply circuit, and the DC pulse current PWM-controlled by the power conversion circuit is detected as a DC pulse current by ACCT.
【0009】また、本願の他の発明は、半導体パワー素
子の正側、負側の個別電流を検出できるのでPWMイン
バータ電力変換回路で運転されるコンプレッサモータの
地絡事故等の電流も検出するものである。Further, another invention of the present application is capable of detecting individual currents on the positive side and the negative side of a semiconductor power element, and thus also detecting a current such as a ground fault of a compressor motor operated by a PWM inverter power conversion circuit. It is.
【0010】また、本願の他の発明は、カレントトラン
スを電力変換回路とコンプレッサモータ回路の間に2ま
たは3個取り付け、低周波数での飽和領域の信号は無視
し飽和しない領域の信号を制御電流信号として検出する
ものである。According to another invention of the present application, two or three current transformers are mounted between a power conversion circuit and a compressor motor circuit, and a signal in a non-saturated region is ignored ignoring a signal in a low-frequency saturated region and controlling a current in a non-saturated region. This is detected as a signal.
【0011】[0011]
【発明の実施の形態】以下本発明の実施の形態について
図面を参照して説明する。Embodiments of the present invention will be described below with reference to the drawings.
【0012】図1は一般的なPWMインバータ制御機器
であり,1は交流電源,2は整流回路、3は平滑コンデ
ンサ,4はPWM電力変換回路、5はモータ、6はカレ
ントトランス(ACCT)7はカレントトランスの負荷
抵抗、8は電流検出とPWMインバータ制御回路であ
る。FIG. 1 shows a general PWM inverter control device, 1 is an AC power supply, 2 is a rectifier circuit, 3 is a smoothing capacitor, 4 is a PWM power conversion circuit, 5 is a motor, 6 is a current transformer (ACCT) 7 Is a load resistance of the current transformer, and 8 is a current detection and PWM inverter control circuit.
【0013】図2は4の電力変換回路に流れ込む電流波
形であり8のPWMインバータ制御回路により周波数は
3kHz程度で電流値は運転条件と負荷モータ定格によ
り数アンペアに設定されている。6のカレントトランス
の1次巻き線数は1でインダクタンスの少ない構成であ
り、2次は3000回巻いてある。この1次巻き線に電
流を流した場合の損失は巻き線損失の銅損が主体となり
損失を小さくできる。FIG. 2 shows a current waveform flowing into the power conversion circuit 4 and the frequency is set to about 3 kHz by the PWM inverter control circuit 8 and the current value is set to several amperes depending on the operating conditions and the load motor rating. The current transformer No. 6 has a configuration in which the number of primary windings is one and the inductance is small, and the secondary is wound 3000 times. The loss when current flows through the primary winding is mainly copper loss of the winding loss, and the loss can be reduced.
【0014】カレントトランスの2次電流を電圧に変換
するため8の電流検出回路には負荷抵抗(RL)を取り
付けている。この抵抗の損失はカレントトランスの2次
電流(通常3mA程度)により殆ど損失がなくコアの磁
性体も汎用で安価なケイ素鋼板を使用できる。In order to convert the secondary current of the current transformer into a voltage, a load resistance (RL) is attached to the current detection circuit 8. This resistance loss is hardly lost due to the secondary current of the current transformer (usually about 3 mA), and a general-purpose and inexpensive silicon steel plate can be used for the magnetic material of the core.
【0015】またカレントトランスの1次、2次間の絶
縁耐圧は交流電源電圧に相当した安全規格の耐圧が部品
単体として容易に得られるので2次出力を直接低圧制御
回路に接続できる。[0015] Since the withstand voltage between the primary and the secondary of the current transformer can be easily obtained as a single component with a safety standard corresponding to the AC power supply voltage, the secondary output can be directly connected to the low voltage control circuit.
【0016】交流電流用に設計された汎用カレントトラ
ンスに直流のパルス波形を流す場合、コアの直流励磁対
策が問題となるが、実施例の調和機のPWM周波数は約
3kHzであり、50/60Hzで設計されたカレント
トランス周波数に対し1/50〜60程度のパルス幅と
なり且つこのパルスの通流率は通常50〜80%で交流
電流の1サイクルの電流(18〜20ms)に対し十分
飽和しない直流パルス電流を図2のように流している。
パルス電流の傾きは配線+モータ巻き線のインピーダン
スにより決められる。またカレントトランスコアの直流
励磁分のリセット作用として、PWMインバータ制御方
式では電力変換回路4にあるパワー素子の上下デッドタ
イム時間のタイミングで直流パルスオフ直後に負荷モー
タの回生エネルギーが4の電力変換回路のダイオード→
平滑コンデンサ3を通してカレントトランスに逆方向に
一瞬流れる。When a DC pulse waveform is applied to a general-purpose current transformer designed for AC current, measures against DC excitation of the core are problematic. However, the PWM frequency of the harmonic machine of the embodiment is about 3 kHz, and 50/60 Hz. The pulse width is about 1/50 to 60 with respect to the current transformer frequency designed in the above, and the duty ratio of this pulse is usually 50 to 80%, and is not sufficiently saturated with respect to one cycle of AC current (18 to 20 ms). A DC pulse current is applied as shown in FIG.
The slope of the pulse current is determined by the impedance of the wiring and the motor winding. In the PWM inverter control method, the regenerative energy of the load motor is 4 immediately after the DC pulse is turned off at the timing of the upper and lower dead times of the power elements in the power conversion circuit 4 as a reset action for the DC excitation of the current transformer core. Diode →
It flows through the smoothing capacitor 3 to the current transformer for a moment in the reverse direction.
【0017】よってコア磁束の励磁をリセットするする
方向に流れるのでコアの飽和は問題とならなくなる。直
流電流が零の間コアに励磁された分の逆電位が2次電圧
として残るがこの値はごくわずかであり制御上問題とな
らない。よって負荷抵抗(RL)の選定により容易に1
次電流に比例した2次電圧の検出が可能である。Accordingly, the core magnetic flux flows in a direction for resetting the excitation, so that the saturation of the core is not a problem. While the DC current is zero, the reverse potential corresponding to the excitation of the core remains as a secondary voltage, but this value is very small and does not pose a problem in control. Therefore, it is easy to select 1 by selecting the load resistance (RL).
A secondary voltage proportional to the secondary current can be detected.
【0018】モータ負荷側の万一の地絡事故等に対して
図1では交流電源の負極性のタイミング(モータ→電力
変換回路の下側パワー素子→ACCT(下側)→整流回
路の下側素子→交流電源→モータ)でしか電流検出は行
わないが、正極性側にも同様のカレントトランスを挿入
することにより交流電源の正極性のタイミング(交流電
源→整流回路の上側素子→ACCT(上側)→電力変換
素子の上側パワー素子→モータ→交流電源)の電流検出
を行うことができる。In the event of a ground fault or the like on the motor load side, the timing of the negative polarity of the AC power supply (motor → lower power element of power conversion circuit → ACCT (lower) → lower side of rectifier circuit in FIG. 1) Current detection is performed only in the element → AC power supply → motor, but by inserting a similar current transformer also in the positive polarity side, the positive polarity timing of the AC power supply (AC power supply → upper element of rectifier circuit → ACCT (upper side) ) → upper power element of the power conversion element → motor → AC power supply).
【0019】図3に請求項3の位置にACCTを取り付
けた場合の実施例を示し、図4にACCTの特性を示
す。汎用カレントトランス(ACCT)は50/60H
z専用に設計されているためモータ電流が低周波数f1
以下ではカレントトランスのコアが飽和しその出力信号
は使用できない。しかしコンプレッサは機能上ある周波
数以上の運転周波数で運転しなければ性能が発揮できな
いので制御上最低周波数をリミットできる。この最低条
件でACCTによる検出が可能であれば電流検出器とし
て使用可能である。FIG. 3 shows an embodiment in which the ACCT is mounted at the position of claim 3, and FIG. 4 shows the characteristics of the ACCT. General-purpose current transformer (ACCT) is 50 / 60H
motor current is low frequency f1
In the following, the core of the current transformer is saturated and its output signal cannot be used. However, the compressor cannot perform its function unless it is operated at an operation frequency higher than a certain frequency, so that the minimum frequency can be limited for control. If detection by ACCT is possible under these minimum conditions, it can be used as a current detector.
【0020】なお、上記本発明の実施の形態において、
図1−1は単相交流電源としたが、三相交流電源、DC
入力電源でも同一の作用効果が得られる。In the embodiment of the present invention,
Although FIG. 1-1 shows a single-phase AC power supply, a three-phase AC power supply, DC
The same operation and effect can be obtained with an input power supply.
【0021】また、図1−2、3は単相全波整流回路構
成としたが、倍電圧整流回路、PFC付き力率改善回
路、その他パッシブ、アクティブ、部分SW方式の入力
力率改善回路構成でも同一の作用効果が得られる。Although FIGS. 1-2 and 3 show a single-phase full-wave rectifier circuit configuration, a voltage-doubler rectifier circuit, a power factor correction circuit with PFC, and other input power factor correction circuit configurations of passive, active, and partial SW systems. However, the same operation and effect can be obtained.
【0022】さらに、図3−6のカレントトランスは
U,W相に2個配置したが、U,V,W相に3個取り付
ける場合もある。Further, although two current transformers are arranged in the U and W phases in FIG. 3-6, three current transformers may be mounted in the U, V and W phases.
【0023】[0023]
【発明の効果】上記実施例から明らかなように、本願発
明はPWMインバータ制御機器に流れる電流検出手段に
おいて、損失を従来の抵抗方式より大幅に低減した電流
検出回路を提案するもので、この構成によれば汎用カレ
ントトランスの採用により高価な絶縁部品が不要となり
安価で省エネルギーという効果を奏する。As is apparent from the above embodiment, the present invention proposes a current detecting circuit in which a loss in a current detecting means flowing through a PWM inverter control device is greatly reduced as compared with a conventional resistance type. According to this, the use of a general-purpose current transformer eliminates the need for expensive insulating parts, and provides an effect of low cost and energy saving.
【0024】また、本願発明は電流検出回路を電源平滑
回路の正極、負極側に2個配置し負荷機器の地絡事故電
流を検出するもので、この構成によれば電流検出器の損
失が最小限で安価な地絡検出保護を行えるという効果を
奏する。In the present invention, two current detection circuits are arranged on the positive and negative sides of the power supply smoothing circuit to detect a ground fault current of a load device. According to this configuration, the loss of the current detector is minimized. In this way, it is possible to provide an inexpensive ground fault detection protection.
【0025】また、本願発明はカレントトランスをコン
プレッサモータ電流検出回路に配置することにより汎用
カレントトランス(ACCT)の飽和領域以外での電流
検出回路を提案するもので、この構成によれば汎用カレ
ントトランスの採用により高価なDCCTが不要となり
安価な電流検出を行えるという効果を奏する。Further, the present invention proposes a current detection circuit outside the saturation region of a general-purpose current transformer (ACCT) by arranging a current transformer in a compressor motor current detection circuit. By adopting the method, an expensive DCCT is not required, and an effect that inexpensive current detection can be performed is achieved.
【図1】本発明の構成を示すブロック図FIG. 1 is a block diagram showing the configuration of the present invention.
【図2】カレントトランス(ACCT)に流れる電流波
形図FIG. 2 is a waveform diagram of a current flowing through a current transformer (ACCT).
【図3】本発明の構成を示すブロック図FIG. 3 is a block diagram showing the configuration of the present invention.
【図4】ACCTの入力電流周波数の出力特性図FIG. 4 is an output characteristic diagram of an input current frequency of ACCT.
【図5】従来の電流検出回路構成を示すブロック図FIG. 5 is a block diagram showing a configuration of a conventional current detection circuit.
1 交流電源 2 整流回路 3 平滑コンデンサ 4 電力変換回路 5 モータ 6 カレントトランス(ACCT) 7 負荷抵抗 8 電流検出+駆動回路 DESCRIPTION OF SYMBOLS 1 AC power supply 2 Rectifier circuit 3 Smoothing capacitor 4 Power conversion circuit 5 Motor 6 Current transformer (ACCT) 7 Load resistance 8 Current detection + drive circuit
フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) H02P 7/36 303 H02P 7/36 303U 5H576 7/63 302K 7/63 302 303V 303 6/02 371D (72)発明者 鈴木 洋平 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 Fターム(参考) 3L060 AA01 CC10 DD02 EE04 3L061 BA01 BA07 5H007 AA06 BB06 CA01 CB02 CB05 CC01 DA05 DC02 EA02 FA03 FA13 FA14 HA01 5H560 AA02 BB04 BB12 DC12 EB01 EC01 JJ01 JJ02 RR10 UA03 XA02 XA12 5H575 AA06 BB02 BB06 BB10 DD06 DD10 GG04 HA08 HB20 LL22 MM02 MM20 5H576 AA10 BB02 BB06 BB10 CC05 DD02 DD07 EE11 GG04 HA02 HB02 LL22 MM02 MM20 Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat II (Reference) H02P 7/36 303 H02P 7/36 303U 5H576 7/63 302K 7/63 302 303V 303 6/02 371D (72) Inventor Yohei Suzuki 1006 Kazuma Kazuma, Kadoma City, Osaka Prefecture F-term (reference) 3L060 AA01 CC10 DD02 EE04 3L061 BA01 BA07 5H007 AA06 BB06 CA01 CB02 CB05 CC01 DA05 DC02 EA02 FA03 FA13 FA14 HA01 5H560 EB12 DC JJ01 JJ02 RR10 UA03 XA02 XA12 5H575 AA06 BB02 BB06 BB10 DD06 DD10 GG04 HA08 HB20 LL22 MM02 MM20 5H576 AA10 BB02 BB06 BB10 CC05 DD02 DD07 EE11 GG04 HA02 HB02 LL22 MM02 MM20
Claims (3)
サモータ駆動のための交流電源を直流に整流する回路、
その直流を平滑する回路、および直流を三相交流に変換
するPWMインバータ電力変換回路を有し、前記PWM
インバータ電力変換回路を制御することで前記コンプレ
ッサモータの回転数を変えその能力を可変速している空
気調和機において,前記PWMインバータ電力変換回路
に用いられている半導体パワー素子への過電流保護と、
前記コンプレッサモータ内部の永久磁石への過励磁保護
を目的とする電流検出要素に交流用のカレントトランス
(ACCT)を電源平滑回路の正極または負極のいずれ
かに設け、そのACCTにより直流のパルス電流を検出
することを特徴とする空気調和機の電流検出回路。A compres- sor motor and a circuit for rectifying an ac power supply for driving the compressor motor into a direct current,
A PWM inverter power conversion circuit for converting the direct current into a three-phase alternating current;
In an air conditioner in which the number of revolutions of the compressor motor is changed by controlling the inverter power conversion circuit, the capacity of the air conditioner is variable, and the overcurrent protection for the semiconductor power element used in the PWM inverter power conversion circuit is performed. ,
An AC current transformer (ACCT) is provided at a positive electrode or a negative electrode of a power supply smoothing circuit as a current detecting element for protecting the permanent magnet inside the compressor motor from over-excitation, and a DC pulse current is generated by the ACCT. A current detection circuit for an air conditioner characterized by detecting.
事故から電力変換回路の半導体パワー素子の過電流保護
を目的とする電流検出要素に交流用のカレントトランス
(ACCT)を電源平滑回路の正極と負極に設け、その
ACCTにより地絡事故電流を検出することを特徴とす
る請求項1記載の空気調和機の電流検出回路。2. An AC current transformer (ACCT) is connected to a positive electrode of a power supply smoothing circuit as a current detecting element for overcurrent protection of a semiconductor power element of a power conversion circuit from a ground fault to a power supply circuit of a compressor motor. 2. The current detection circuit for an air conditioner according to claim 1, wherein the current detection circuit is provided on a negative electrode and detects a ground fault current by the ACCT.
号として取り込む目的とする電流検出要素に交流用のカ
レントトランス(ACCT)をモータ回路に設け、その
ACCTにより制御電流を検出することを特徴とする請
求項1記載の空気調和機の電流検出回路。3. An AC current transformer (ACCT) is provided in a motor circuit as a current detecting element for taking in an operating current of a compressor motor as a control signal, and the control current is detected by the ACCT. Item 2. The current detection circuit for an air conditioner according to Item 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000239711A JP2002058254A (en) | 2000-08-08 | 2000-08-08 | Current detector circuit for air conditioner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000239711A JP2002058254A (en) | 2000-08-08 | 2000-08-08 | Current detector circuit for air conditioner |
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Publication Number | Publication Date |
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JP2002058254A true JP2002058254A (en) | 2002-02-22 |
Family
ID=18731204
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CN103612039A (en) * | 2013-11-26 | 2014-03-05 | 上海通用重工集团有限公司 | Inverter welder output current detecting circuit based on AC signal and detecting method |
CN103616548A (en) * | 2013-11-26 | 2014-03-05 | 上海通用重工集团有限公司 | Inverter welder output current detecting circuit and detecting method based on direct current signals |
JP2015148372A (en) * | 2014-02-05 | 2015-08-20 | 三菱電機株式会社 | Air conditioner |
CN109026652A (en) * | 2018-09-13 | 2018-12-18 | 宁波恒帅微电机有限公司 | A kind of washing pump detection device |
CN110645683A (en) * | 2019-09-05 | 2020-01-03 | 成都仙德科技有限公司 | Portable sound energy air conditioner compressor control method |
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2000
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101567623B (en) * | 2009-04-02 | 2012-08-22 | 伟肯(苏州)电气传动有限公司 | Startup method of frequency converter and startup device |
CN103612039A (en) * | 2013-11-26 | 2014-03-05 | 上海通用重工集团有限公司 | Inverter welder output current detecting circuit based on AC signal and detecting method |
CN103616548A (en) * | 2013-11-26 | 2014-03-05 | 上海通用重工集团有限公司 | Inverter welder output current detecting circuit and detecting method based on direct current signals |
CN103616548B (en) * | 2013-11-26 | 2015-12-30 | 上海通用重工集团有限公司 | A kind of output current of inverting welding machine testing circuit based on direct current signal and detection method |
JP2015148372A (en) * | 2014-02-05 | 2015-08-20 | 三菱電機株式会社 | Air conditioner |
CN109026652A (en) * | 2018-09-13 | 2018-12-18 | 宁波恒帅微电机有限公司 | A kind of washing pump detection device |
CN109026652B (en) * | 2018-09-13 | 2024-02-23 | 宁波恒帅股份有限公司 | Washing pump detection equipment |
CN110645683A (en) * | 2019-09-05 | 2020-01-03 | 成都仙德科技有限公司 | Portable sound energy air conditioner compressor control method |
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