JP2005117788A - Three-phase open phase detecting circuit and air conditioner using the same - Google Patents

Three-phase open phase detecting circuit and air conditioner using the same Download PDF

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JP2005117788A
JP2005117788A JP2003349254A JP2003349254A JP2005117788A JP 2005117788 A JP2005117788 A JP 2005117788A JP 2003349254 A JP2003349254 A JP 2003349254A JP 2003349254 A JP2003349254 A JP 2003349254A JP 2005117788 A JP2005117788 A JP 2005117788A
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phase
power source
circuit
switch
control unit
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Hiroshi Hatanaka
浩志 畑中
Atsushi Kobayashi
淳 小林
Masafumi Nishinomiya
理文 西宮
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-phase open phase detecting circuit of a three-phase power source which does not incorrectly recognize an open phase power source as a normal power source when the open phase occurs in a three-phase electric circuit. <P>SOLUTION: The three-phase open phase detecting circuit includes a controller power source circuit 5 using any voltage between two phases of the three-phase power source 1, a switch controller 6 using the controller power source circuit 5 as a power source, and a switch 21 provided between the three-phase AC power source 1 and a three-phase load 4. The switch 21 is closed by the switch controller 6 to supply current to the three-phase electric circuit 101, and a current detecting circuit 10 is provided in the residual one phase. The current flowing to the phase is detected by the current detecting circuit 10, and the voltage outputted from the current detecting circuit 10 is inputted to a protective unit 7. If the open phase is judged by the protective unit 7, a signal for opening the switch 21 is sent to the switch controller 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、三相交流電源を電源とする機器において三相交流電源の欠相検出を行ない、機器の保護を行なう三相欠相検出回路に関するものである。   The present invention relates to a three-phase open phase detection circuit that performs phase loss detection of a three-phase AC power source in a device that uses a three-phase AC power source as a power source and protects the device.

従来、この種の三相交流電源を電源とする機器では、電線断線又は接続線の外れ等により欠相が生じた場合、三相交流電源と接続された三相電路に不均衡な電流が流れ、欠相した相以外の相に過電流が流れる為に機器が破損する恐れがあった。その保護手段のひとつとして、欠相検出手段を備えているものが考えられている（例えば、特許文献１参照）。   Conventionally, in a device that uses this type of three-phase AC power supply as a power source, if a phase failure occurs due to wire breakage or disconnection of connection lines, an unbalanced current flows through the three-phase circuit connected to the three-phase AC power supply. There was a risk of equipment damage due to overcurrent flowing in a phase other than the phase that was out of phase. As one of the protection means, one having a phase loss detection means is considered (for example, see Patent Document 1).

従来の三相欠相検出回路を、図６〜図７を参照しながら説明する。   A conventional three-phase phase loss detection circuit will be described with reference to FIGS.

図６は、三相交流電源1の各相−中性点(以下Ｎ)間の電流を検出する手段に、フォトカプラ２１を用いた検出回路２と、この検出回路２より制御部３へ出力された各相の信号をもとに欠相を判定する制御部３を用いた構成となっている。   FIG. 6 shows a detection circuit 2 using a photocoupler 21 as means for detecting a current between each phase and a neutral point (hereinafter referred to as N) of the three-phase AC power supply 1, and an output from the detection circuit 2 to the control unit 3. The control unit 3 is used to determine the missing phase based on the signal of each phase.

この構成において、三相交流電源１の各相−Ｎ間に配置されたフォトカプラ２１により、各相−Ｎ間で検出された電流は、図７のような各相毎のある一定値の遅れｔ１のような信号が出力され、このｔ１がある一定値の遅れ時間が生じていれば正常、遅れ時間がある一定値以外であれば欠相として、各相のｔ１の遅れ時間を制御部３が判定している。
特開平８−１２６１９４号公報 In this configuration, the current detected between each phase and N by the photocoupler 21 arranged between each phase and N of the three-phase AC power supply 1 is delayed by a certain value for each phase as shown in FIG. A signal such as t1 is output, and if the delay time of t1 is a certain value, the control unit 3 sets the delay time of t1 of each phase as normal. Is judged.
JP-A-8-126194

しかしながら、前記従来の三相欠相検出回路では、三相負荷４が電動機のように中線点１０２を有している場合、三相負荷４へ通電中に三相交流電源に欠相が生じたとき、起動した三相負荷４の欠相が生じている負荷接続点と中性点１０２は、ほぼ同電位となってしまう。   However, in the conventional three-phase open-phase detection circuit, when the three-phase load 4 has a middle point 102 like an electric motor, the three-phase AC power supply is open while the three-phase load 4 is energized. When this occurs, the load connection point where the phase failure of the activated three-phase load 4 occurs and the neutral point 102 become substantially the same potential.

この負荷接続点に発生した中性点電圧１０３は、三相交流電源と接続された三相負荷４との間の三相電路１０１に発生し、この中性点電圧１０３によりフォトカプラ２１が誤検出してしまい、図７と同じような検出信号が制御部３に入力され、欠相検出ができないという課題を有していた。   The neutral point voltage 103 generated at the load connection point is generated in the three-phase circuit 101 between the three-phase AC power source and the three-phase load 4, and the neutral voltage 103 causes the photocoupler 21 to malfunction. As a result, the detection signal similar to that shown in FIG. 7 is input to the control unit 3 and the phase loss detection cannot be performed.

本発明はこのような従来の課題を解決するものであり、三相交流電源１に欠相が生じた時に、負荷接続点から発生する中性点電圧１０３が発生した場合においても、その中性点電圧１０３を誤検出すること無く欠相の検出を行なうことを目的とするものである。   The present invention solves such a conventional problem, and when a phase failure occurs in the three-phase AC power source 1, even when a neutral point voltage 103 generated from the load connection point is generated, the neutral point is generated. The object is to detect a phase failure without erroneously detecting the point voltage 103.

前記従来の課題を解決するために本発明は、三相交流電源のいずれか二相の相間電圧を制御部電源回路の電源とし、他の相の三相電路に電流を検出する電流検出回路を有し、この電流検出回路が所定の値を検出したときに開閉器を開とすることで、三相負荷の停止保護を行なうものである。   In order to solve the above-described conventional problems, the present invention provides a current detection circuit for detecting a current in a three-phase circuit of another phase, using a voltage between two phases of a three-phase AC power source as a power source of a control unit power circuit. The three-phase load stop protection is provided by opening the switch when the current detection circuit detects a predetermined value.

また、三相交流電源のいずれか二相の相間電圧を制御部電源回路の電源とし、他の相の三相電路に電流を検出する電流検出回路を有し、前記制御部電源回路を電源とするととも
に前記電流検出回路が所定の値を検出したときに前記開閉器を開とする制御部を設けたものである。 Further, a voltage between any two phases of the three-phase AC power supply is used as a power supply for the control unit power supply circuit, and a current detection circuit for detecting a current in a three-phase circuit of another phase is provided, In addition, a control unit is provided that opens the switch when the current detection circuit detects a predetermined value.

また、電流検出回路の電流検出部にカレントトランスを用い、電流検出回路は制御部電源回路を電源とするとともに、電流検出回路が所定の値を検出したときに開閉器を開とする保護部を設けた構成としたものである。   In addition, a current transformer is used for the current detection unit of the current detection circuit. The current detection circuit uses a control unit power circuit as a power source, and a protection unit that opens the switch when the current detection circuit detects a predetermined value. The configuration is provided.

また、前記の負荷を圧縮機とし、三相欠相検出回路を搭載した空気調和機である。   The load is a compressor, and an air conditioner equipped with a three-phase phase loss detection circuit.

上記構成により、三相交流電源に接続された三相負荷へ電流が流れている時に欠相が生じた場合、負荷接続点から発生する中性点電圧が欠相した三相電路に発生した時においても、この中性点電圧を電流検出回路が誤検出すること無く欠相の検出を行なうことを目的とするものである。   With the above configuration, when a phase loss occurs when current flows to a three-phase load connected to a three-phase AC power supply, a neutral point voltage generated from the load connection point occurs in a three-phase circuit with a phase loss However, the present invention aims to detect an open phase without erroneously detecting the neutral point voltage by the current detection circuit.

本発明の三相欠相検出回路は、三相交流電源に欠相が生じた場合においても、三相交流電源のいずれか二相の相間電圧を用いた制御部電源回路と、他の相の電流を検出する電流検出回路により、欠相時に負荷接続点から発生した中性点電圧を、誤認識することなく安定した三相欠相検出を行なうことができ、三相負荷の保護停止を行なうことができる三相欠相検出回路を提供するものである。   The three-phase phase loss detection circuit of the present invention has a control unit power circuit that uses the voltage between two phases of the three-phase AC power source and the other phase even when a phase loss occurs in the three-phase AC power source. The current detection circuit that detects the current can perform stable three-phase open phase detection without erroneously recognizing the neutral point voltage generated from the load connection point during open phase, and stop the protection of the three-phase load. The present invention provides a three-phase phase loss detection circuit that can perform the above-described operation.

第１の発明は、三相交流電源と、この三相交流電源に開閉器を介して接続される負荷と、この開閉器の開閉制御を行なう開閉器制御部と、前記開閉器制御部の電源とする制御部電源回路と、前記三相交流電源と前記負荷とを接続する各相の電路とを具備し、前記三相交流電源のいずれか二相の相間電圧を前記制御部電源回路の電源とし、他の相の電路上に前記電流検出回路が所定の値を検出したときに前記開閉器を開とする信号を開閉器制御部へ出力する保護部を設けることにより、三相交流電源に欠相が生じた場合においても、三相交流電源のいずれか二相の相間電圧を用いた制御部電源回路と、他の相の電流を検出する電流検出回路により、欠相時に負荷接続点から発生した中性点電圧を、誤認識することなく安定した三相欠相検出を行なうことができ、負荷の保護停止を行なうことができる
第２の発明は、三相交流電源と、この三相交流電源に開閉器を介して接続される三相負荷と、前記三相交流電源と前記三相負荷とを接続する各相の電路とを具備し、前記三相交流電源のいずれか二相の相間電圧を用いた制御部電源回路と、他の相の電路上に電流検出回路の電流検出部を設け、前記制御部電源回路を電源とするとともに前記電流検出回路が所定の値を検出したときに前記開閉器を開とする制御部を設けることにより、三相交流電源に欠相が生じた場合においても、三相交流電源のいずれか二相の相間電圧を用いた制御部電源回路と、他の相の電流を検出する電流検出回路により、欠相時に負荷接続点から発生した中性点電圧を、誤認識することなく安定した三相欠相検出を行なうことができ、負荷の保護停止を行なうことができる
第３の発明は、三相交流電源の電流を検出する電流検出回路の電流検出部に、カレントトランスを用いることにより、三相交流電源に欠相が生じた場合においても、三相交流電源のいずれか二相の相間電圧を用いた制御部電源回路と、他の相の電流を検出する電流検出回路により、欠相時に負荷接続点から発生した中性点電圧を、誤認識することなく安定した三相欠相検出を行なうことができ、負荷の保護停止を行なうことができる。 A first invention includes a three-phase AC power source, a load connected to the three-phase AC power source via a switch, a switch control unit that performs switching control of the switch, and a power source for the switch control unit A control unit power supply circuit, and a three-phase AC power supply and an electric circuit of each phase connecting the load, and the voltage between the two phases of the three-phase AC power supply is supplied to the power supply of the control unit power supply circuit And providing a protection unit that outputs a signal for opening the switch to the switch control unit when the current detection circuit detects a predetermined value on the electric circuit of the other phase. Even when a phase loss occurs, the control unit power supply circuit using the voltage between the two phases of the three-phase AC power supply and the current detection circuit that detects the current of the other phase can be Stable three-phase phase loss detection without misrecognizing the generated neutral point voltage The second invention is a three-phase AC power source, a three-phase load connected to the three-phase AC power source via a switch, and the three-phase AC power source. And a control circuit power supply circuit using a voltage between two phases of the three-phase AC power supply, and a current detection circuit on the other-phase electric circuit. Current control unit, and the control unit power supply circuit as a power source and a control unit that opens the switch when the current detection circuit detects a predetermined value. Even when a phase occurs, it is generated from the load connection point at the time of phase loss by the control unit power circuit that uses the voltage between the two phases of the three-phase AC power supply and the current detection circuit that detects the current of the other phase. Stable three-phase phase loss detection without erroneous recognition of the neutral point voltage The third aspect of the present invention is a three-phase AC power supply by using a current transformer in the current detection part of the current detection circuit that detects the current of the three-phase AC power supply. Even when a phase loss occurs, the control unit power supply circuit using the voltage between the two phases of the three-phase AC power supply and the current detection circuit that detects the current of the other phase, from the load connection point at the time of phase loss Stable three-phase open phase detection can be performed without erroneously recognizing the generated neutral point voltage, and load protection can be stopped.

第４の発明は、負荷に圧縮機を用い、上記第1〜第３の発明のいずれかに記載の三相欠相検出回路を空気調和機に搭載することにより、三相交流電源に欠相が生じた場合においても、圧縮機の保護停止を行なうことができ、空気調和機本体に損傷を与えることがない。   According to a fourth aspect of the present invention, a compressor is used as a load, and the three-phase AC phase detection circuit according to any one of the first to third inventions is mounted on an air conditioner, so that a three-phase AC power supply is open. Even in the case of occurrence, the compressor can be protected and the air conditioner main body will not be damaged.

以下、本発明の実施の形態について図面を参照しながら説明する。なお、この発明の実施の形態によって本発明が限定されるものではない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the present invention is not limited by the embodiment of the present invention.

（実施の形態１）
図１に示すように、三相交流電源１に開閉器２１を介して接続される三相負荷４と、開閉器２１を制御する制御部電源回路５を電源とした開閉器制御部６と、三相電路１０１に流れる電流を検出する電流検出回路１０を設ける。 (Embodiment 1)
As shown in FIG. 1, a three-phase load 4 connected to a three-phase AC power source 1 via a switch 21, a switch control unit 6 that uses a control unit power circuit 5 that controls the switch 21 as a power source, A current detection circuit 10 for detecting a current flowing through the three-phase electric circuit 101 is provided.

上記の構成にて、１は三相交流電源である。２１は開閉器であり、非通電時は開となっている。開閉器制御部６からの制御によって、三相負荷４の動作時は開閉器２１を閉として三相負荷４に通電を行なっている。   In the above configuration, 1 is a three-phase AC power source. Reference numeral 21 denotes a switch that is open when power is not supplied. Under the control of the switch control unit 6, when the three-phase load 4 is operating, the switch 21 is closed and the three-phase load 4 is energized.

開閉器制御部６は、三相交流電源１のＲ相−Ｔ相間の相間電圧を用いた制御部電源回路５を電源としている。   The switch control unit 6 uses the control unit power supply circuit 5 using the interphase voltage between the R phase and the T phase of the three-phase AC power supply 1 as a power source.

電流検出回路１０は、Ｓ相に設けた三相電路１０１に流れる電流を検出している。電流検出部にはカレントトランス１１を用い、入力した電流を電圧に出力するものである。出力された電圧がある所定の値を検出した時に、保護部７が開閉器２１を開とする信号を開閉器制御部６に送る。その結果、開閉器２１は開閉器制御部６からの制御により、開となって三相負荷４の保護停止を行なう。   The current detection circuit 10 detects a current flowing through the three-phase electric circuit 101 provided in the S phase. A current transformer 11 is used for the current detector, and the input current is output as a voltage. When the output voltage detects a certain value, the protection unit 7 sends a signal for opening the switch 21 to the switch control unit 6. As a result, the switch 21 is opened under the control of the switch control unit 6 and the protection of the three-phase load 4 is stopped.

まず、Ｒ・Ｔ相に欠相が生じた場合について説明する。図４中、正常時に示すように、Ｒ相−Ｔ相間の相間電圧を電源とする制御部電源回路５により、安定化電圧が出力される。この安定化電圧を電源とする開閉器制御部６により、開閉器２１の制御が行なわれる。   First, a case where a phase failure occurs in the R / T phase will be described. In FIG. 4, as shown in a normal state, a stabilization voltage is output by the control unit power supply circuit 5 that uses the phase-phase voltage between the R phase and the T phase as a power source. The switch 21 is controlled by the switch controller 6 that uses the stabilized voltage as a power source.

しかし、Ｒに欠相が生じた場合には図４に示すように、欠相時にＲ相−Ｔ相間の相間電圧が低下するため、制御部電源回路５から出力される安定化電圧が低下する。その結果、開閉器制御部6を動作させるための電圧を制御部電源回路５が供給できなくなるので開閉器制御部６は停止する。よって、開閉器２１は開となり三相負荷４への通電を停止し、三相負荷４の保護を行なうことができる。また、Ｔ相欠相についてもＲ相と同様である。   However, when an open phase occurs in R, as shown in FIG. 4, the phase voltage between the R phase and the T phase decreases during the open phase, and thus the stabilization voltage output from the control unit power supply circuit 5 decreases. . As a result, the control unit power supply circuit 5 cannot supply a voltage for operating the switch control unit 6, so the switch control unit 6 stops. Therefore, the switch 21 is opened, the energization to the three-phase load 4 is stopped, and the three-phase load 4 can be protected. The T phase missing phase is the same as the R phase.

次に、Ｓ相に欠相が生じた場合について説明する。三相電路１０１に流れる電流を、電流検出回路１０によって検出する。Ｓ相の電流が正常な場合、図２のように、負荷に応じて検出された電流は、カレントトランス１１によって電圧に変換され、保護部７にある所定の電圧値で入力される。そして、保護部７はＳ相の入力電圧をあるしきい値内であれば正常という判断を行なう。   Next, a case where a phase failure occurs in the S phase will be described. The current flowing through the three-phase circuit 101 is detected by the current detection circuit 10. When the S-phase current is normal, the current detected in accordance with the load is converted into a voltage by the current transformer 11 and input at a predetermined voltage value in the protection unit 7 as shown in FIG. The protection unit 7 determines that the S-phase input voltage is normal if the input voltage is within a certain threshold.

しかし、例えばＳ相が欠相した場合には、図３のように欠相によって入力電流がゼロになり、図３中、Ｓ相欠相状態にカレントトランス１１より出力された電圧は低下する。この出力電圧を判定する保護部７は、あるしきい値以下の電圧を検出することになり、Ｓ相の欠相という判断を行なう。そして保護部７は、開閉器２１を開とする信号を開閉器制御部６に送る。その結果、開閉器２１は開閉器制御部６からの制御により、開となって三相負荷４の保護停止を行なう。   However, for example, when the S phase is lost, the input current becomes zero due to the open phase as shown in FIG. 3, and the voltage output from the current transformer 11 in the S phase open state in FIG. The protection unit 7 for determining the output voltage detects a voltage equal to or lower than a certain threshold value, and determines that the S phase is missing. Then, the protection unit 7 sends a signal for opening the switch 21 to the switch control unit 6. As a result, the switch 21 is opened under the control of the switch control unit 6 and the protection of the three-phase load 4 is stopped.

なお、電流検出を行なう手段としてシャント抵抗を用いた手段が知られており、このシャント抵抗を用いても同様の効果を期待することができる。   Note that means using a shunt resistor is known as means for performing current detection, and the same effect can be expected even when this shunt resistor is used.

（実施の形態２）
図５に示すように、三相交流電源１に開閉器２１を介して接続される三相負荷４と、開
閉器２１を制御する制御部電源回路５を電源とした制御部８と、三相電路１０１に流れる電流を検出する電流検出回路１０を設ける。 (Embodiment 2)
As shown in FIG. 5, a three-phase load 4 connected to a three-phase AC power source 1 via a switch 21, a control unit 8 that uses a control unit power circuit 5 that controls the switch 21 as a power source, A current detection circuit 10 for detecting a current flowing through the electric circuit 101 is provided.

上記の構成にて、1は三相交流電源である。２１は開閉器であり、非通電時は開となっている。制御部８からの制御によって、三相負荷４の動作時は開閉器２１を閉として三相負荷４に通電を行なっている。   In the above configuration, 1 is a three-phase AC power source. Reference numeral 21 denotes a switch that is open when power is not supplied. Under the control of the control unit 8, when the three-phase load 4 is operating, the switch 21 is closed to energize the three-phase load 4.

制御部８は、三相交流電源１のＲ相−Ｔ相間の相間電圧を用いた制御部電源回路５を電源としている。   The control unit 8 uses the control unit power supply circuit 5 using the interphase voltage between the R phase and the T phase of the three-phase AC power supply 1 as a power source.

電流検出回路１０は、Ｓ相に設けた三相電路１０１に流れる電流を検出している。電流検出回路１０が、ある所定の値を検出した時に、制御部８が開閉器２１を開とする。その結果、開閉器２１は制御部８からの制御により、開となって三相負荷４の保護停止を行なう。   The current detection circuit 10 detects a current flowing through the three-phase electric circuit 101 provided in the S phase. When the current detection circuit 10 detects a certain predetermined value, the control unit 8 opens the switch 21. As a result, the switch 21 is opened under the control of the control unit 8 and the protection of the three-phase load 4 is stopped.

まず、Ｒ相・Ｔ相に欠相が生じた場合について説明する。   First, a case where an open phase occurs in the R phase and the T phase will be described.

実施形態１と同様、Ｒ相に欠相が生じた場合には、図４中、欠相時に示すように、Ｒ相−Ｔ相間の相間電圧が低下するため、制御部電源回路５から出力される安定化電圧が低下する。その結果、制御部８を動作させるための電圧を制御部電源回路５が供給できなくなるので制御部８は停止する。よって、開閉器２１は開となり三相負荷４への通電を停止し、三相負荷４の保護を行なうことができる。また、Ｔ相欠相についてもＲ相と同様である。   As in the first embodiment, when an open phase occurs in the R phase, the voltage between the R phase and the T phase decreases as shown in FIG. The stabilization voltage decreases. As a result, the control unit power supply circuit 5 cannot supply a voltage for operating the control unit 8, and the control unit 8 stops. Therefore, the switch 21 is opened, the energization to the three-phase load 4 is stopped, and the three-phase load 4 can be protected. The T phase missing phase is the same as the R phase.

次に、Ｓ相に欠相が生じた場合について説明する。   Next, a case where a phase failure occurs in the S phase will be described.

実施形態１と同様、例えばＳ相が欠相した場合には、図３のように欠相によって入力電流がゼロになり、図３中、Ｓ相欠相状態により電流検出回路１０より出力された電圧は低下する。この出力電圧を検出する制御部８は、あるしきい値以下の電圧を検出した時に制御部８が開閉器２１を開とする。その結果、開閉器２１は制御部８からの制御により、開となって三相負荷４の保護停止を行なう。   As in the first embodiment, for example, when the S phase is lost, the input current becomes zero due to the lost phase as shown in FIG. 3, and is output from the current detection circuit 10 due to the S phase lost state in FIG. The voltage drops. When the control unit 8 that detects the output voltage detects a voltage equal to or lower than a certain threshold value, the control unit 8 opens the switch 21. As a result, the switch 21 is opened under the control of the control unit 8 and the protection of the three-phase load 4 is stopped.

本発明の実施の形態1における三相欠相検出回路の回路図Circuit diagram of a three-phase phase loss detection circuit according to the first embodiment of the present invention 本発明の実施の形態1及び２における正常な場合の電流検出回路の入力電流と出力電圧を示す特性図FIG. 5 is a characteristic diagram showing the input current and output voltage of the current detection circuit in the normal case according to the first and second embodiments of the present invention. 本発明の実施の形態1及び２における欠相の場合の電流検出回路の入力電流と出力電圧を示す特性図FIG. 5 is a characteristic diagram showing the input current and output voltage of the current detection circuit in the case of phase loss in the first and second embodiments of the present invention. 本発明の実施の形態1及び２におけるＲ相−T間の制御部電源回路の入力電圧と出力電圧を示す特性図The characteristic view which shows the input voltage and output voltage of the control part power supply circuit between R phase-T in Embodiment 1 and 2 of this invention 本発明の実施の形態２における三相欠相検出回路の回路図Circuit diagram of a three-phase phase loss detection circuit according to Embodiment 2 of the present invention 従来の三相欠相検出回路の回路図Circuit diagram of conventional three-phase phase loss detection circuit 従来の三相欠相検出回路によるマイコン制御部の入力信号を示す特性図Characteristic diagram showing the input signal of the microcomputer controller by the conventional three-phase phase loss detection circuit

符号の説明Explanation of symbols

１ 三相交流電源
４ 三相負荷
５ 制御部電源回路
６ 開閉器制御部
７ 保護部
１０ 電流検出回路
１１ カレントトランス
２１ 開閉器
１０１ 三相電路
１０３ 中性点電圧 DESCRIPTION OF SYMBOLS 1 Three-phase alternating current power supply 4 Three-phase load 5 Control part power supply circuit 6 Switch control part 7 Protection part 10 Current detection circuit 11 Current transformer 21 Switch 101 Three-phase electric circuit 103 Neutral point voltage

Claims (4)

三相交流電源と、この三相交流電源に開閉器を介して接続される負荷と、この開閉器の開閉制御を行なう開閉器制御部と、前記開閉器制御部の電源とする制御部電源回路と、前記三相交流電源と前記負荷とを接続する各相の電路とを具備し、前記三相交流電源のいずれか二相の相間電圧を前記制御部電源回路の電源とし、他の相の電路上に前記電流検出回路が所定の値を検出したときに前記開閉器を開とする信号を開閉器制御部へ出力する保護部を設けたことを特徴とする三相欠相検出回路。 A three-phase AC power source, a load connected to the three-phase AC power source via a switch, a switch control unit for controlling the switching of the switch, and a control unit power circuit serving as a power source for the switch control unit And an electric circuit of each phase connecting the three-phase AC power source and the load, and the voltage between the two phases of the three-phase AC power source is used as the power source of the control unit power circuit, 3. A three-phase phase loss detection circuit, comprising: a protection unit that outputs a signal for opening the switch to a switch control unit when the current detection circuit detects a predetermined value on an electric circuit. 三相交流電源と、この三相交流電源に開閉器を介して接続される三相負荷と、前記三相交流電源と前記三相負荷とを接続する各相の電路とを具備し、前記三相交流電源のいずれか二相の相間電圧を用いた制御部電源回路と、他の相の電路上に電流検出回路の電流検出部を設け、前記制御部電源回路を電源とするとともに前記電流検出回路が所定の値を検出したときに前記開閉器を開とする制御部を設けたことを特徴とする三相欠相検出回路。 A three-phase AC power source, a three-phase load connected to the three-phase AC power source via a switch, and an electric circuit for each phase connecting the three-phase AC power source and the three-phase load. A control unit power supply circuit using the phase voltage between any two phases of the phase AC power supply and a current detection unit of a current detection circuit are provided on the electric circuit of the other phase, and the control unit power supply circuit is used as a power supply and the current detection 3. A three-phase phase loss detection circuit, comprising a control unit that opens the switch when the circuit detects a predetermined value. 三相交流電源の電流を検出する電流検出回路の電流検出部に、カレントトランスを用いたことを特徴とする請求項１〜２記載の三相欠相検出回路。 3. The three-phase open phase detection circuit according to claim 1, wherein a current transformer is used as a current detection unit of a current detection circuit for detecting a current of a three-phase AC power source. 負荷に圧縮機を用いたことを特徴とする、請求項１〜３のいずれかに記載の三相欠相検出回路を用いた空気調和機。 The air conditioner using the three-phase phase loss detection circuit according to any one of claims 1 to 3, wherein a compressor is used as a load.
JP2003349254A 2003-10-08 2003-10-08 Three-phase open phase detecting circuit and air conditioner using the same Pending JP2005117788A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007017187A (en) * 2005-07-05 2007-01-25 Hitachi Industrial Equipment Systems Co Ltd Phase interruption detection circuit
WO2011023137A1 (en) * 2009-08-31 2011-03-03 Byd Company Limited Open phase detection system and method for three-phase motor
CN103869202A (en) * 2012-12-13 2014-06-18 国家电网公司 Transformer high-tension side phase-failure detection method and system
CN104143810A (en) * 2013-05-16 2014-11-12 介国安 Null wire disconnection protector
CN104215839A (en) * 2014-09-19 2014-12-17 中国一冶集团有限公司 Method and device for detecting phase sequence of electric motor by utilizing extremely low frequency current
CN104459355A (en) * 2013-09-24 2015-03-25 珠海格力电器股份有限公司 Phase sequence detection device
CN113687151A (en) * 2021-08-24 2021-11-23 合肥美的暖通设备有限公司 Phase-loss detection method, device, drive circuit, motor, electrical equipment and medium

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007017187A (en) * 2005-07-05 2007-01-25 Hitachi Industrial Equipment Systems Co Ltd Phase interruption detection circuit
WO2011023137A1 (en) * 2009-08-31 2011-03-03 Byd Company Limited Open phase detection system and method for three-phase motor
US8497651B2 (en) 2009-08-31 2013-07-30 Byd Company Limited Open phase detection system and method for three-phase motor
CN103869202A (en) * 2012-12-13 2014-06-18 国家电网公司 Transformer high-tension side phase-failure detection method and system
CN104143810A (en) * 2013-05-16 2014-11-12 介国安 Null wire disconnection protector
CN104459355A (en) * 2013-09-24 2015-03-25 珠海格力电器股份有限公司 Phase sequence detection device
CN104215839A (en) * 2014-09-19 2014-12-17 中国一冶集团有限公司 Method and device for detecting phase sequence of electric motor by utilizing extremely low frequency current
CN104215839B (en) * 2014-09-19 2017-04-12 中国一冶集团有限公司 Method and device for detecting phase sequence of electric motor by utilizing extremely low frequency current
CN113687151A (en) * 2021-08-24 2021-11-23 合肥美的暖通设备有限公司 Phase-loss detection method, device, drive circuit, motor, electrical equipment and medium
CN113687151B (en) * 2021-08-24 2024-06-11 合肥美的暖通设备有限公司 Open-phase detection method, device, motor, electrical equipment and medium

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