JP2007139316A

JP2007139316A - Air conditioner

Info

Publication number: JP2007139316A
Application number: JP2005333920A
Authority: JP
Inventors: Yuji Tani; 祐二谷; Takahito Uejima; 敬人上島; Seiji Fukui; 誠二福井
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2005-11-18
Filing date: 2005-11-18
Publication date: 2007-06-07

Abstract

<P>PROBLEM TO BE SOLVED: To safely stop an air conditioner, even when the inverter section fails. <P>SOLUTION: When an overcurrent signal from an overcurrent detection portion 8 is generated at the stopping of the inverter portion 7, by cutting off a power source relay 2 of an indoor unit 1, the air conditioner can be stopped safely, without deteriorating a compression motor 6 through chain reaction, even at the failure of the inverter portion 7. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、空気調和機の電気回路の保護動作に関するものである。 The present invention relates to a protective operation of an electric circuit of an air conditioner.

従来、この種の空気調和機としては、過電流発生時に圧縮機用ＤＣモータの駆動を停止させるものがあった（特許文献１、２参照）。図８は従来の空気調和機を示すものであり、ＡＣ電源が入力される室内機２４と、室内機２４に設けられた電源リレー２によってＡＣ電源がオンオフされる室外機３で構成され、室外機３にＡＣ電圧を整流するダイオードブリッジ４と、ダイオードブリッジ４にて整流された電圧を平滑するコンデンサ５と、圧縮機モータ６と、圧縮機モータ６の巻線に接続されブリッジ接続されたスイッチング素子をスイッチング動作させることによりコンデンサ５にて平滑されたＤＣ電圧を圧縮機モータ６に擬似交流電圧として印加するインバータ部７と、インバータ部７に入力されるＤＣ電圧の母線電流部に接続されインバータ部７と圧縮機モータ６を保護するために過電流検知動作を行う過電流検知部８と、インバータ部７をドライブし室内機２４と通信を行う制御部２５とが設けられ、制御部２５は過電流検知部８からの過電流信号によりインバータ部７を停止させる。
特開平９−１４５１２４号公報特開平８−９５４８号公報 Conventionally, as this type of air conditioner, there has been one that stops the driving of a DC motor for a compressor when an overcurrent occurs (see Patent Documents 1 and 2). FIG. 8 shows a conventional air conditioner, which includes an indoor unit 24 to which AC power is input, and an outdoor unit 3 in which AC power is turned on and off by a power relay 2 provided in the indoor unit 24. A diode bridge 4 that rectifies the AC voltage in the machine 3, a capacitor 5 that smoothes the voltage rectified by the diode bridge 4, a compressor motor 6, and a switching connection that is bridge-connected to the winding of the compressor motor 6. An inverter connected to a DC current smoothed by the capacitor 5 by switching the element is applied to the compressor motor 6 as a pseudo alternating voltage, and a bus current portion of the DC voltage input to the inverter 7. An overcurrent detection unit 8 that performs an overcurrent detection operation in order to protect the unit 7 and the compressor motor 6; And a control unit 25 which performs signal is provided, the control unit 25 to the inverter section 7 is stopped by the overcurrent signal from the overcurrent detecting unit 8.
JP-A-9-145124 JP-A-8-9548

しかしながら、前記従来の構成では過電流発生時に制御部がインバータ部の駆動信号を止めるしかインバータ部の過電流を停止させる方法を持たないため、インバータ部の故障によりインバータ部が制御部からの駆動信号を受付けなくなった場合には、インバータ部と圧縮機モータに流れる過電流をとめる手段がなく、インバータ部の故障により圧縮機モータを連鎖的に破壊したり、インバータ部の激しい破壊をまねいていた。 However, in the conventional configuration, when the overcurrent occurs, the control unit has a method of stopping the overcurrent of the inverter unit only by stopping the drive signal of the inverter unit. In the case where the inverter is no longer accepted, there is no means to stop the overcurrent flowing through the inverter unit and the compressor motor, and the compressor motor is broken in a chain due to the failure of the inverter unit, or the inverter unit is severely destroyed.

本発明は、上記従来の課題を解決することを目的とするものである。 The present invention aims to solve the above conventional problems.

前記従来の課題を解決するために、本発明の空気調和機は、インバータ部の停止中の過電流を検知して室内機の電源リレーをオフさせて室外機の電源を遮断することによりインバータ部の故障時にも圧縮機モータを連鎖的に破壊させず、また、インバータ部の激しい破壊を防ぎ安全に空気調和機を停止させるものである。 In order to solve the above-mentioned conventional problems, the air conditioner of the present invention detects an overcurrent while the inverter unit is stopped, turns off the power relay of the indoor unit, and shuts off the power source of the outdoor unit. In this case, the compressor motor is not broken in a chain, and the air conditioner is stopped safely by preventing the inverter from being severely broken.

本発明の空気調和機は、インバータ部の停止中の過電流を検知して室内機の電源リレーをオフさせて室外機の電源を遮断することで、インバータ部の故障によりインバータ部が制御部からの駆動停止信号を受付けなくなった場合に室外機の電源を遮断してインバータ部の過電流を停止させ、インバータ部の故障により圧縮機モータを連鎖的に破壊したり、インバータ部の激しい破壊をまねいていたことを解決することができる。 The air conditioner of the present invention detects an overcurrent while the inverter unit is stopped and turns off the power relay of the indoor unit to shut off the power source of the outdoor unit. When the drive stop signal is no longer received, the outdoor unit power is shut off to stop the overcurrent of the inverter, and the compressor motor can be damaged in a chain due to the failure of the inverter, or the inverter can be severely damaged. You can solve what you were doing.

第１の発明は、インバータ部が停止時に過電流検知部からの過電流信号が発生した場合はインバータ部の故障であると判断し室内機の電源リレーを遮断することにより、インバータ部故障時の圧縮機モータの連鎖的な破壊や、インバータ部の激しい破壊を防ぐことが可能となる。 In the first invention, when an overcurrent signal from the overcurrent detection unit is generated when the inverter unit is stopped, it is determined that the inverter unit is faulty, and the power relay of the indoor unit is cut off, so that It becomes possible to prevent the chain breakage of the compressor motor and the severe destruction of the inverter unit.

第２の発明は、圧縮機モータの各巻線にＤＣ電圧のプラス側とマイナス側に抵抗を接続し、圧縮機の停止中に圧縮機モータの各巻線電圧が一定値以外であればインバータ部の故障であると判断し、室内機の電源リレーを遮断させるものである。 According to a second aspect of the present invention, a resistor is connected to the positive side and the negative side of the DC voltage to each winding of the compressor motor, and if each winding voltage of the compressor motor is other than a constant value while the compressor is stopped, It is determined that there is a failure, and the power relay of the indoor unit is cut off.

第３の発明は、インバータ部が停止中にＤＣ電圧が一定値以下であればインバータ部の故障であると判断し室内機の電源リレーを遮断させるものである。 According to a third aspect of the present invention, if the DC voltage is equal to or less than a certain value while the inverter unit is stopped, it is determined that the inverter unit has failed, and the power relay of the indoor unit is shut off.

第４の発明は、室外機のＡＣ入力部に電流制限抵抗と電流制限抵抗を短絡させるリレーを設け、インバータ動作中は電流制限抵抗を短絡させるリレーをオンさせ、インバータ停止中は電流制限抵抗を短絡させるリレーをオフさせ、インバータ停止中にＤＣ電圧が一定値以下であればインバータ部の故障であると判断し室内機の電源リレーを遮断させるものである。 According to a fourth aspect of the present invention, a relay for short-circuiting the current limiting resistor and the current limiting resistor is provided in the AC input portion of the outdoor unit, the relay for short-circuiting the current limiting resistor is turned on during the inverter operation, and the current limiting resistor is set during the inverter stop. The relay to be short-circuited is turned off, and if the DC voltage is equal to or lower than a certain value while the inverter is stopped, it is determined that the inverter unit has failed and the power relay of the indoor unit is shut off.

第５の発明は、室外機のＤＣ電圧の母線部に電流制限抵抗と電流制限抵抗を短絡させるリレーを設け、インバータ動作中は電流制限抵抗を短絡させるリレーをオンさせ、インバータ停止中は電流制限抵抗を短絡させるリレーをオフさせ、インバータ停止中に電流制限抵抗の両端電圧が一定値以上であればインバータ部の故障であると判断し、室内機の電源リレーを遮断させるものである。 5th invention provides the relay which short-circuits a current limiting resistor and a current limiting resistor in the bus-line part of the DC voltage of an outdoor unit, turns on the relay which short-circuits a current limiting resistor during inverter operation, and current limitation when an inverter stops The relay that short-circuits the resistor is turned off. If the voltage across the current limiting resistor is equal to or higher than a certain value while the inverter is stopped, it is determined that the inverter unit has failed, and the power relay of the indoor unit is shut off.

第６の発明は、室外機のＡＣ電源入力部に電流検知回路を設け、インバータ停止中に電流値が一定値以上であればインバータ部の故障であると判断し室内機の電源リレーを遮断させるものである。 According to a sixth aspect of the present invention, a current detection circuit is provided in the AC power input unit of the outdoor unit, and if the current value is equal to or greater than a certain value while the inverter is stopped, it is determined that the inverter unit is faulty and the indoor unit power relay is shut off. Is.

第７の発明は、室内機の室外機へのＡＣ電源供給部に電流検知回路を設け、インバータ停止中に電流値が一定値以上であればインバータ部の故障であると判断し室内機の電源リレーを遮断させるものである。 According to a seventh aspect of the present invention, a current detection circuit is provided in the AC power supply unit to the outdoor unit of the indoor unit. The relay is cut off.

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、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. Note that the present invention is not limited to the embodiments.

（実施の形態１）
図１は本発明の第１の実施の形態における空気調和機の回路図である。ＡＣ電源が入力される室内機１と、室内機１に設けられた電源リレー２によってＡＣ電源がオンオフされる室外機３で構成され、室外機３にＡＣ電圧を整流するダイオードブリッジ４と、ダイオードブリッジ４にて整流された電圧を平滑するコンデンサ５と、圧縮機モータ６と、圧縮機モータ６の巻線に接続されブリッジ接続されたスイッチング素子をスイッチング動作させることによりコンデンサ５にて平滑されたＤＣ電圧を圧縮機モータ６に擬似交流電圧として印加するインバータ部７と、インバータ部７に入力されるＤＣ電圧の母線電流部に接続されインバータ部７と圧縮機モータ６を保護するために過電流検知動作を行う過電流検知部８と、インバータ部７をドライブし室内機１と通信を行う制御部９とが設けられ、制御部９は過電流検知部８からの過電流信号によりインバータ部７を停止させるとともに、インバータ部７が停止中も過電流検知部８からの過電流信号が発生している場合は室内機１に電源リレー２をオフする指示を行い、室外機３のＡＣ電源遮断を行う。 (Embodiment 1)
FIG. 1 is a circuit diagram of an air conditioner according to a first embodiment of the present invention. A diode bridge 4 configured to rectify an AC voltage to the outdoor unit 3, which includes an indoor unit 1 to which AC power is input, an outdoor unit 3 in which the AC power is turned on / off by a power relay 2 provided in the indoor unit 1, and a diode The capacitor 5 for smoothing the voltage rectified by the bridge 4, the compressor motor 6, and the switching element connected to the windings of the compressor motor 6 and connected to the bridge are switched and smoothed by the capacitor 5. An overcurrent is applied to protect the inverter unit 7 and the compressor motor 6 connected to the inverter unit 7 that applies a DC voltage to the compressor motor 6 as a pseudo alternating voltage, and the bus current unit of the DC voltage input to the inverter unit 7. An overcurrent detection unit 8 that performs a detection operation and a control unit 9 that drives the inverter unit 7 and communicates with the indoor unit 1 are provided. The inverter unit 7 is stopped by the overcurrent signal from the detection unit 8, and the power supply relay 2 is turned off to the indoor unit 1 when the overcurrent signal from the overcurrent detection unit 8 is generated even when the inverter unit 7 is stopped. The AC power of the outdoor unit 3 is shut off.

以上のように構成された空気調和機では、インバータ部７の故障により制御部９からの停止信号でインバータ部７の過電流を停止できなくなった場合においても、制御部９からの信号により室内機１の電源リレー２が遮断されるので、インバータ部７の過電流を停止する事ができ、インバータ部７の故障により圧縮機モータ６を連鎖的に破壊したり、インバータ部７の激しい破壊防ぐ事が可能となる。 In the air conditioner configured as described above, even when the overcurrent of the inverter unit 7 cannot be stopped by the stop signal from the control unit 9 due to the failure of the inverter unit 7, the indoor unit is received by the signal from the control unit 9. 1 power supply relay 2 is cut off, the overcurrent of the inverter unit 7 can be stopped, the compressor motor 6 can be broken in a chain due to the failure of the inverter unit 7, or the inverter unit 7 can be prevented from being severely broken. Is possible.

（実施の形態２）
図２は本発明の第２の実施の形態における空気調和機の回路図である。第１の実施の形態と同じ機能を持つ部分については同一の番号を付与し説明を省略する。 (Embodiment 2)
FIG. 2 is a circuit diagram of an air conditioner according to the second embodiment of the present invention. Portions having the same functions as those in the first embodiment are given the same numbers, and description thereof is omitted.

圧縮機モータ６の各巻線にＤＣ電圧のプラス側とマイナス側に抵抗１０が接続され、圧縮機モータ６の各巻線の電圧が制御部１１に入力されている。インバータ部７の停止中は圧縮機モータ６の各巻線の電圧は、インバータ部７内部のスイッチング素子がすべてオフであるのでＤＣ電圧のプラス側とマイナス側に接続された抵抗１０によって規定される。インバータ部７の故障により制御部１１がインバータ部７を停止中にもインバータ部７や圧縮機モータ６に電流が流れる場合は、インバータ部７の内部スイッチング素子のどれかがオンしているのでそのスイッチング素子に接続されている圧縮機モータ６の巻線電圧がインバータ部７が正常に停止している値から変動する。制御部１１はインバータ部７が停止中に入力される圧縮機モータ６の各巻線の電圧がインバータ部７の停止中に規定される一定値以外であれば、室内機１に電源リレー２をオフする指示を行い、室外機３のＡＣ電源遮断を行う。 A resistor 10 is connected to each winding of the compressor motor 6 on the plus side and minus side of the DC voltage, and the voltage of each winding of the compressor motor 6 is input to the control unit 11. While the inverter unit 7 is stopped, the voltage of each winding of the compressor motor 6 is defined by the resistor 10 connected to the positive side and the negative side of the DC voltage because all the switching elements inside the inverter unit 7 are off. If current flows through the inverter unit 7 or the compressor motor 6 even when the control unit 11 stops the inverter unit 7 due to a failure of the inverter unit 7, one of the internal switching elements of the inverter unit 7 is turned on. The winding voltage of the compressor motor 6 connected to the switching element varies from the value at which the inverter unit 7 is normally stopped. The control unit 11 turns off the power supply relay 2 to the indoor unit 1 if the voltage of each winding of the compressor motor 6 input while the inverter unit 7 is stopped is other than a predetermined value specified while the inverter unit 7 is stopped. The AC power of the outdoor unit 3 is shut off.

以上のように構成された空気調和機では、インバータ部７の故障により制御部１１からの停止信号でインバータ部７の過電流を停止できなくなった場合においても、制御部１１からの信号により室内機１の電源リレー２が遮断されるので、インバータ部７の過電流を停止する事ができ、インバータ部７の故障により圧縮機モータ６を連鎖的に破壊したり、インバータ部７の激しい破壊防ぐ事が可能となるとともに、実施の形態１の空気調和機と比べて過電流検知部を必要とせず回路構成が簡単であり、インバータ部７の故障によってインバータ部７や圧縮機モータ６に流れる電流が小さい場合にも圧縮機モータ６の巻線電圧の変動として検知できるので、インバータ部７の故障時により安全に空気調和機を停止させる事ができる。 In the air conditioner configured as described above, even when the overcurrent of the inverter unit 7 cannot be stopped by the stop signal from the control unit 11 due to the failure of the inverter unit 7, the indoor unit is received by the signal from the control unit 11. 1 power supply relay 2 is cut off, the overcurrent of the inverter unit 7 can be stopped, the compressor motor 6 can be broken in a chain due to the failure of the inverter unit 7, or the inverter unit 7 can be prevented from being severely broken. Compared to the air conditioner of the first embodiment, the overcurrent detection unit is not required and the circuit configuration is simple, and the current flowing through the inverter unit 7 and the compressor motor 6 due to the failure of the inverter unit 7 is reduced. Even if it is small, it can be detected as a change in the winding voltage of the compressor motor 6, so that the air conditioner can be safely stopped when the inverter unit 7 fails.

（実施の形態３）
図３はは本発明の第３の実施の形態における空気調和機の回路図である。第１の実施の形態と同じ機能を持つ部分については同一の番号を付与し説明を省略する。ＤＣ電圧が制御部１２に入力されており、インバータ部７の故障により制御部１２がインバータ部７を停止中にもインバータ部７や圧縮機モータ６に電流が流れる場合はＤＣ電圧が低下するので、制御部１２はインバータ部７が停止中に入力されるＤＣ電圧が一定値以下であれば、室内機１に電源リレー２をオフする指示を行い、室外機３のＡＣ電源遮断を行う。 (Embodiment 3)
FIG. 3 is a circuit diagram of an air conditioner according to the third embodiment of the present invention. Portions having the same functions as those in the first embodiment are given the same numbers, and description thereof is omitted. Since the DC voltage is input to the control unit 12 and the current flows through the inverter unit 7 and the compressor motor 6 even when the control unit 12 stops the inverter unit 7 due to a failure of the inverter unit 7, the DC voltage decreases. When the DC voltage input while the inverter unit 7 is stopped is equal to or less than a certain value, the control unit 12 instructs the indoor unit 1 to turn off the power supply relay 2 and shuts off the AC power of the outdoor unit 3.

以上のように構成された空気調和機では、インバータ部７の故障により制御部１２からの停止信号でインバータ部７の過電流を停止できなくなった場合においても、制御部１２からの信号により室内機１の電源リレー２が遮断されるので、インバータ部７の過電流を停止する事ができ、インバータ部７の故障により圧縮機モータ６を連鎖的に破壊したり、インバータ部７の激しい破壊防ぐ事が可能となるとともに、実施の形態１の空気調和機と比べ、コンデンサ５に接続されるインバータ部７以外の回路が故障した場合も検知が可能となるので、より安全に空気調和機を停止させる事ができる。 In the air conditioner configured as described above, even when the overcurrent of the inverter unit 7 cannot be stopped by the stop signal from the control unit 12 due to the failure of the inverter unit 7, the indoor unit is received by the signal from the control unit 12. 1 power supply relay 2 is cut off, the overcurrent of the inverter unit 7 can be stopped, the compressor motor 6 can be broken in a chain due to the failure of the inverter unit 7, or the inverter unit 7 can be prevented from being severely broken. As compared with the air conditioner of the first embodiment, it is possible to detect even when a circuit other than the inverter unit 7 connected to the capacitor 5 breaks down, so that the air conditioner can be stopped more safely. I can do things.

（実施の形態４）
図４は本発明の第４の実施の形態における空気調和機の回路図であり、第３の実施の形態における空気調和機の室外機３のＡＣ電源入力部に、電流制限用抵抗１３と電流制限抵抗１３を短絡させる抵抗短絡リレー１４を設け、制御部１５はインバータ部７が動作中は抵抗短絡リレー１４をオンさせ、インバータ部７が停止中には抵抗短絡リレー１４をオフさせ、インバータ部７が停止中に入力されるＤＣ電圧が一定値以下であれば、室内機１に電源リレー２をオフする指示を行い、室外機３のＡＣ電源遮断を行うものである。 (Embodiment 4)
FIG. 4 is a circuit diagram of an air conditioner according to a fourth embodiment of the present invention. A current limiting resistor 13 and a current are connected to an AC power input portion of the outdoor unit 3 of the air conditioner according to the third embodiment. A resistance short-circuit relay 14 for short-circuiting the limiting resistor 13 is provided. The control unit 15 turns on the resistance short-circuit relay 14 while the inverter unit 7 is in operation, and turns off the resistance short-circuit relay 14 when the inverter unit 7 is stopped. If the DC voltage input while 7 is stopped is equal to or less than a certain value, the indoor unit 1 is instructed to turn off the power relay 2, and the AC power of the outdoor unit 3 is shut off.

以上のように構成された空気調和機では、インバータ部７の故障により制御部１５からの停止信号でインバータ部７の過電流を停止できなくなった場合においても、制御部１５からの信号により室内機１の電源リレー２が遮断されるので、インバータ部７の過電流を停止する事ができ、インバータ部７の故障により圧縮機モータ６を連鎖的に破壊したり、インバータ部７の激しい破壊防ぐ事が可能となるとともに、実施の形態３の空気調和機と比べ、インバータ部７の故障によってインバータ部７や圧縮機モータ６に流れる電流が小さい場合にも電流制限抵抗１３によりＤＣ電圧の低下が大きくなるので制御部１５にて検知が可能となりより安全に空気調和機を停止させる事ができる。 In the air conditioner configured as described above, even when the overcurrent of the inverter unit 7 cannot be stopped by the stop signal from the control unit 15 due to the failure of the inverter unit 7, the indoor unit is received by the signal from the control unit 15. 1 power supply relay 2 is cut off, the overcurrent of the inverter unit 7 can be stopped, the compressor motor 6 can be broken in a chain due to the failure of the inverter unit 7, or the inverter unit 7 can be prevented from being severely broken. Compared with the air conditioner of the third embodiment, the current limiting resistor 13 greatly reduces the DC voltage even when the current flowing through the inverter unit 7 and the compressor motor 6 is small due to the failure of the inverter unit 7. As a result, detection by the control unit 15 is possible, and the air conditioner can be stopped more safely.

（実施の形態５）
図５は本発明の第５の実施の形態における空気調和機の回路図であり、ＡＣ電源が入力される室内機１と、室内機１に設けられた電源リレー２によってＡＣ電源がオンオフされる室外機３で構成され、室外機３にＡＣ電圧を整流するダイオードブリッジ４と、ダイオードブリッジ４にて整流された電圧を平滑するコンデンサ５と、圧縮機モータ６と、圧縮機モータ６の巻線に接続されブリッジ接続されたスイッチング素子をスイッチング動作させることによりコンデンサ５にて平滑されたＤＣ電圧を圧縮機モータ６に擬似交流電圧として印加するインバータ部７と、インバータ部７をドライブし室内機１と通信を行う制御部１８とが設けられ、室外機３のダイオードブリッジ４とコンデンサ５の間に電流制限抵抗１６と電流制限抵抗１６を短絡させる抵抗短絡リレー１７が設けられ、電流制限抵抗１７の両端電圧が制御部１８に入力され、制御部１８はインバータ部７が停止中には抵抗短絡リレー１７をオフさせ、電流制限抵抗１６の両端電圧が一定値以上の場合に室内機１に電源リレー２をオフする指示を行う。 (Embodiment 5)
FIG. 5 is a circuit diagram of an air conditioner according to a fifth embodiment of the present invention, in which AC power is turned on / off by an indoor unit 1 to which AC power is input and a power relay 2 provided in the indoor unit 1. The outdoor unit 3 includes a diode bridge 4 that rectifies an AC voltage to the outdoor unit 3, a capacitor 5 that smoothes the voltage rectified by the diode bridge 4, a compressor motor 6, and a winding of the compressor motor 6. The inverter unit 7 applies a DC voltage smoothed by the capacitor 5 to the compressor motor 6 as a pseudo AC voltage by switching the switching element connected to the bridge and connected to the inverter unit 7, and drives the inverter unit 7 to drive the indoor unit 1. And a control unit 18 that communicates with each other, and short-circuit the current limiting resistor 16 and the current limiting resistor 16 between the diode bridge 4 and the capacitor 5 of the outdoor unit 3. The resistance short-circuit relay 17 is provided, and the voltage across the current limiting resistor 17 is input to the control unit 18. The control unit 18 turns off the resistance short-circuit relay 17 while the inverter unit 7 is stopped, and When the voltage is above a certain value, the indoor unit 1 is instructed to turn off the power supply relay 2.

以上のように構成された空気調和機では、インバータ部７の故障により制御部１８からの停止信号でインバータ部７の過電流を停止できなくなった場合においても、制御部１８からの信号により室内機１の電源リレー２が遮断されるので、インバータ部７の過電流を停止する事ができ、インバータ部７の故障により圧縮機モータ６を連鎖的に破壊したり、インバータ部７の激しい破壊防ぐ事が可能となるとともに、実施の形態３の空気調和機と比べインバータ部７の故障により流れる電流を電流制限抵抗１６の両端電圧として直接検知できるので、インバータ部７の故障により流れる電流が小さい場合においても検知が可能となりより安全に空気調和機を停止させる事ができる。 In the air conditioner configured as described above, even when the overcurrent of the inverter unit 7 cannot be stopped by the stop signal from the control unit 18 due to the failure of the inverter unit 7, the indoor unit is received by the signal from the control unit 18. 1 power supply relay 2 is cut off, the overcurrent of the inverter unit 7 can be stopped, the compressor motor 6 can be broken in a chain due to the failure of the inverter unit 7, or the inverter unit 7 can be prevented from being severely broken. Since the current flowing due to the failure of the inverter unit 7 can be directly detected as the voltage across the current limiting resistor 16 as compared with the air conditioner of the third embodiment, the current flowing due to the failure of the inverter unit 7 is small. Can be detected and the air conditioner can be stopped more safely.

（実施の形態６）
図６は本発明の第６の実施の形態における空気調和機を示すものであり、ＡＣ電源が入力される室内機１と、室内機１に設けられた電源リレー２によってＡＣ電源がオンオフされる室外機３で構成され、室外機３にＡＣ電圧を整流するダイオードブリッジ４と、ダイオードブリッジ４にて整流された電圧を平滑するコンデンサ５と、圧縮機モータ６と、圧縮機モータ６の巻線に接続されブリッジ接続されたスイッチング素子をスイッチング動作させることによりコンデンサ５にて平滑されたＤＣ電圧を圧縮機モータ６に擬似交流電圧として印加するインバータ部７と、インバータ部７をドライブし室内機１と通信を行う制御部１９と室外機３のＡＣ電源入力部に電流検知部２０が設けられ、制御部１９はインバータ部７が停止中に電流検知部２０から検出した電流が一定値以上であれば室内機１に電源リレー２をオフする指示を行う。 (Embodiment 6)
FIG. 6 shows an air conditioner according to a sixth embodiment of the present invention, in which AC power is turned on / off by an indoor unit 1 to which AC power is input and a power relay 2 provided in the indoor unit 1. The outdoor unit 3 includes a diode bridge 4 that rectifies an AC voltage to the outdoor unit 3, a capacitor 5 that smoothes the voltage rectified by the diode bridge 4, a compressor motor 6, and a winding of the compressor motor 6. The inverter unit 7 applies a DC voltage smoothed by the capacitor 5 to the compressor motor 6 as a pseudo AC voltage by switching the switching element connected to the bridge and connected to the inverter unit 7, and drives the inverter unit 7 to drive the indoor unit 1. The current detection unit 20 is provided in the AC power input unit of the outdoor unit 3 and the control unit 19 that communicates with the control unit 19, and the control unit 19 includes a current detection unit while the inverter unit 7 is stopped. If 0 detected current is more than a certain value from an instruction to turn off the power supply relay 2 to the indoor unit 1.

以上のように構成された空気調和機では、インバータ部７の故障により制御部１９からの停止信号でインバータ部７の過電流を停止できなくなった場合においても、制御部１９からの信号により室内機１の電源リレー２が遮断されるので、インバータ部７の過電流を停止する事ができ、インバータ部７の故障により圧縮機モータ６を連鎖的に破壊したり、インバータ部７の激しい破壊防ぐ事が可能となるとともに、実施の形態６の空気調和機と
比べダイオードブリッジ４の故障時も過電流を検知できるのでより安全に空気調和機を停止させる事ができる。 In the air conditioner configured as described above, even when the overcurrent of the inverter unit 7 cannot be stopped by the stop signal from the control unit 19 due to the failure of the inverter unit 7, the indoor unit is received by the signal from the control unit 19. 1 power supply relay 2 is cut off, the overcurrent of the inverter unit 7 can be stopped, the compressor motor 6 can be broken in a chain due to the failure of the inverter unit 7, or the inverter unit 7 can be prevented from being severely broken. As compared with the air conditioner of the sixth embodiment, the overcurrent can be detected even when the diode bridge 4 fails, so that the air conditioner can be stopped more safely.

（実施の形態７）
図７は本発明の第７の実施の形態における空気調和機を示すものであり、ＡＣ電源が入力される室内機２１と、室内機２１に設けられた電源リレー２によってＡＣ電源がオンオフされる室外機３で構成され、室外機３にＡＣ電圧を整流するダイオードブリッジ４と、ダイオードブリッジにて整流された電圧を平滑するコンデンサ５と、圧縮機モータ６と、圧縮機モータ６の巻線に接続されブリッジ接続されたスイッチング素子をスイッチング動作させることによりコンデンサ５にて平滑されたＤＣ電圧を圧縮機モータ６に擬似交流電圧として印加するインバータ部７と、インバータ部７をドライブし室内機１と通信を行う制御部２３とが設けられ、室内機２１の室外機３へのＡＣ電源供給ラインに電流検知部２２が設けられ、電源リレー２をオンさせて室外機３にＡＣ電源を供給中でかつ室外機３が運転していない場合に電流検知部２２が一定以上の電流を検知すれば、電源リレー２をオフし室外機３のＡＣ電源を遮断する。 (Embodiment 7)
FIG. 7 shows an air conditioner according to a seventh embodiment of the present invention, in which AC power is turned on / off by an indoor unit 21 to which AC power is input and a power relay 2 provided in the indoor unit 21. The outdoor unit 3 includes a diode bridge 4 that rectifies an AC voltage to the outdoor unit 3, a capacitor 5 that smoothes the voltage rectified by the diode bridge, a compressor motor 6, and a winding of the compressor motor 6. An inverter unit 7 that applies a DC voltage smoothed by the capacitor 5 as a pseudo alternating voltage to the compressor motor 6 by switching the connected switching elements connected in a bridge, drives the inverter unit 7, and the indoor unit 1 And a control unit 23 that performs communication, an AC power supply line to the outdoor unit 3 of the indoor unit 21, a current detection unit 22, and a power relay 2 When the AC power is being supplied to the outdoor unit 3 and the outdoor unit 3 is not in operation, if the current detection unit 22 detects a current exceeding a certain level, the power relay 2 is turned off and the AC power of the outdoor unit 3 is turned off. Shut off.

以上のように構成された空気調和機では、インバータ部７の故障により制御部２３からの停止信号で過電流を停止できなくなった場合においても、室内機２１の電源リレー２が遮断されるので、インバータ部７の過電流を停止する事ができ、インバータ部７の故障により圧縮機モータ６を連鎖的に破壊したり、インバータ部７の激しい破壊防ぐ事が可能となるとともに、実施の形態１の空気調和機と比べ室外機３の停止中に室外機に発生した故障による過電流は全て検知し室外機の電源を遮断できるので、より安全に空気調和機を停止させる事ができる。 In the air conditioner configured as described above, even when the overcurrent cannot be stopped by a stop signal from the control unit 23 due to a failure of the inverter unit 7, the power relay 2 of the indoor unit 21 is cut off. The overcurrent of the inverter unit 7 can be stopped, the compressor motor 6 can be broken in a chain due to the failure of the inverter unit 7, and the inverter unit 7 can be prevented from being severely broken. Compared with the air conditioner, since all overcurrents caused by the failure occurring in the outdoor unit during the stop of the outdoor unit 3 can be detected and the power supply of the outdoor unit can be shut off, the air conditioner can be stopped more safely.

本発明の空気調和機は室内機と室外機の分離型においてのものであるが、インバータ部とは別の回路ブロックでインバータ部の電源を遮断できる構成となっていれば、他のモータ駆動を行うインバータ機器にも適用できる。 The air conditioner of the present invention is a separate type of indoor unit and outdoor unit. However, if the power supply of the inverter unit can be shut off by a circuit block different from the inverter unit, other motor drive can be performed. It can also be applied to inverter equipment.

本発明の実施の形態１における空気調和機の回路図The circuit diagram of the air conditioner in Embodiment 1 of this invention 本発明の実施の形態２における空気調和機の回路図Circuit diagram of air conditioner according to Embodiment 2 of the present invention 本発明の実施の形態３における空気調和機の回路図Circuit diagram of an air conditioner according to Embodiment 3 of the present invention 本発明の実施の形態４における空気調和機の回路図Circuit diagram of air conditioner according to Embodiment 4 of the present invention 本発明の実施の形態５における空気調和機の回路図Circuit diagram of air conditioner according to Embodiment 5 of the present invention 本発明の実施の形態６における空気調和機の回路図Circuit diagram of air conditioner according to Embodiment 6 of the present invention 本発明の実施の形態７における空気調和機の回路図Circuit diagram of air conditioner according to Embodiment 7 of the present invention 従来の空気調和機の回路図Circuit diagram of conventional air conditioner

Explanation of symbols

１室内機
２電源リレー
３室外機
４ダイオードブリッジ
５コンデンサ
６圧縮機モータ
７インバータ部
８過電流検知部
９制御部
１０抵抗
１１制御部
１２制御部
１３電流制限抵抗
１４抵抗短絡リレー
１５制御部
１６電流制限抵抗
１７抵抗短絡リレー
１８制御部
１９制御部
２０電流検知部
２１室内機
２２電流検知部
２３制御部
２４従来の空気調和機の室内機室外機の制御部
２５従来の空気調和機の室外機の制御部

DESCRIPTION OF SYMBOLS 1 Indoor unit 2 Power supply relay 3 Outdoor unit 4 Diode bridge 5 Capacitor 6 Compressor motor 7 Inverter part 8 Overcurrent detection part 9 Control part 10 Resistance 11 Control part 12 Control part 13 Current limiting resistance 14 Resistance short-circuit relay 15 Control part 16 Current Limiting resistor 17 Resistance short-circuit relay 18 Control unit 19 Control unit 20 Current detection unit 21 Indoor unit 22 Current detection unit 23 Control unit 24 Conventional air conditioner indoor unit outdoor unit control unit 25 Conventional air conditioner outdoor unit Control unit

Claims

An indoor unit to which AC power is input, an outdoor unit in which AC power is turned on and off by a power relay provided in the indoor unit, a diode bridge that rectifies an AC voltage to the outdoor unit, and the diode bridge The compressor smoothes the DC voltage smoothed by the capacitor by switching operation of a capacitor that smoothes the rectified voltage, a compressor motor, and a switching element connected to the winding of the compressor motor and bridge-connected. Overcurrent detection for performing an overcurrent detection operation to protect the inverter unit and the compressor motor connected to the inverter unit for applying a pseudo alternating voltage to the motor and a bus current unit for a DC voltage input to the inverter unit And a control unit that drives the inverter unit and communicates with the indoor unit. In the machine, the control unit stops the inverter unit by an overcurrent signal from the overcurrent detection unit, and an overcurrent signal from the overcurrent detection unit is generated even when the inverter unit is stopped. An air conditioner characterized in that the indoor unit is instructed to turn off the power supply relay, and the AC power of the outdoor unit is shut off.

An indoor unit to which AC power is input, an outdoor unit in which AC power is turned on and off by a power relay provided in the indoor unit, a diode bridge that rectifies an AC voltage to the outdoor unit, and the diode bridge The compressor smoothes the DC voltage smoothed by the capacitor by switching operation of a capacitor that smoothes the rectified voltage, a compressor motor, and a switching element connected to the winding of the compressor motor and bridge-connected. In an air conditioner provided with an inverter unit that applies a pseudo AC voltage to a motor and a control unit that drives the inverter unit and communicates with the indoor unit, a DC voltage is added to each winding of the compressor motor. A resistor is connected to the negative side and the winding voltage of the compressor motor is input to the control unit, and the control The unit instructs the indoor unit to turn off the power relay if the winding voltage of the compressor motor input while the inverter unit is stopped is other than a constant value, and shuts off the AC power of the outdoor unit. An air conditioner characterized by performing.

An indoor unit to which AC power is input, an outdoor unit in which AC power is turned on and off by a power relay provided in the indoor unit, a diode bridge that rectifies AC voltage to the outdoor unit, and the diode bridge The compressor smoothes the DC voltage smoothed by the capacitor by switching operation of a capacitor that smoothes the rectified voltage, a compressor motor, and a switching element connected to the winding of the compressor motor and bridge-connected. In an air conditioner provided with an inverter unit that applies a pseudo alternating voltage to a motor and a control unit that drives the inverter unit and communicates with the indoor unit, a DC voltage is input to the control unit, and the control If the DC voltage input while the inverter is stopped is below a certain value, the power supply to the indoor unit It performs an instruction to turn off the laser, air conditioner and performs the AC power loss of the outdoor unit.

The outdoor unit AC power input part of the air conditioner according to claim 3 is provided with a resistance short-circuit relay for short-circuiting the current limiting resistor and the current limiting resistor, and the control unit is configured to operate the resistance when the inverter unit is stopped. An air conditioner characterized by turning off a short-circuit relay.

An indoor unit to which AC power is input, an outdoor unit in which AC power is turned on and off by a power relay provided in the indoor unit, a diode bridge that rectifies an AC voltage to the outdoor unit, and the diode bridge The compressor smoothes the DC voltage smoothed by the capacitor by switching operation of a capacitor that smoothes the rectified voltage, a compressor motor, and a switching element connected to the winding of the compressor motor and bridge-connected. In an air conditioner provided with an inverter unit that applies a pseudo alternating voltage to a motor and a control unit that drives the inverter unit and communicates with the indoor unit, between the diode bridge and the capacitor of the outdoor unit And a resistance short-circuit relay that short-circuits the current limiting resistor and the current limiting resistor. A voltage across the limiting resistor is input to the control unit, and the control unit turns off the resistance short-circuit relay while the inverter unit is stopped. An air conditioner characterized by instructing the unit to turn off the power supply relay and shutting off the AC power of the outdoor unit.

An indoor unit to which AC power is input, an outdoor unit in which AC power is turned on and off by a power relay provided in the indoor unit, a diode bridge that rectifies an AC voltage to the outdoor unit, and the diode bridge The compressor smoothes the DC voltage smoothed by the capacitor by switching operation of a capacitor that smoothes the rectified voltage, a compressor motor, and a switching element connected to the winding of the compressor motor and bridge-connected. In an air conditioner provided with an inverter unit that applies a pseudo alternating voltage to a motor and a control unit that drives the inverter unit and communicates with the indoor unit, a current detection unit is connected to an AC power input unit of the outdoor unit The controller detects that the current detected from the current detector while the inverter is stopped is greater than or equal to a certain value. Place the performed instruction to turn off the power supply relay in the indoor unit, air conditioner and performs the AC power loss of the outdoor unit.

An indoor unit to which AC power is input, an outdoor unit in which AC power is turned on and off by a power relay provided in the indoor unit, a diode bridge that rectifies an AC voltage to the outdoor unit, and the diode bridge The compressor smoothes the DC voltage smoothed by the capacitor by switching operation of a capacitor that smoothes the rectified voltage, a compressor motor, and a switching element connected to the winding of the compressor motor and bridge-connected. In an air conditioner provided with an inverter unit that applies a pseudo AC voltage to a motor and a control unit that drives the inverter unit and communicates with the indoor unit, AC power supply to the outdoor unit of the indoor unit A current detection unit is provided in the line, the power supply relay is turned on, and AC power is being supplied to the outdoor unit. If sensing the current detection unit is constant or more current when the outdoor unit is not operating, the air conditioner, characterized in that turns off the power supply relay to cut off the AC power of the outdoor unit.