JP2013219976A - Air conditioner - Google Patents

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JP2013219976A
JP2013219976A JP2012090189A JP2012090189A JP2013219976A JP 2013219976 A JP2013219976 A JP 2013219976A JP 2012090189 A JP2012090189 A JP 2012090189A JP 2012090189 A JP2012090189 A JP 2012090189A JP 2013219976 A JP2013219976 A JP 2013219976A
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relay
voltage
circuit
air conditioner
voltage value
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Atsushi Komori
厚志 小森
Akihiro Kai
昭裕 甲斐
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner that prevents an inrush current from flowing through an inverter circuit and an excessive load current from flowing through a resistance connected in parallel with a relay, by reliably detecting welding or non-operation of the relay before starting a normal operation of the inverter circuit.SOLUTION: The air conditioner includes: a rectification circuit 2 for rectifying a commercial AC voltage; a smoothing capacitor 7 for smoothing a DC voltage rectified by the rectification circuit 2; an inverter circuit 3 for converting the DC voltage to an AC voltage to feed a motor for driving a compressor 4; an inrush current suppression circuit 16 comprising a relay 5 connected in series between the rectification circuit 2 and the smoothing capacitor 7 and an inrush current prevention resistance 6 connected in parallel with the relay 5; and an outdoor unit side control circuit 10 for detecting welding or non-operation of a contact of the relay 5 on the basis of a first DC voltage value at the time of controlling off the relay 5 and a second DC voltage value at the time of controlling on the relay 5 during restricted energization.

Description

本発明は、空気調和機に関する。   The present invention relates to an air conditioner.

従来、インバータ回路を備える空気調和機では、電源投入時に電荷が充電されていない平滑コンデンサに流入する過大な突入電流を抑制するために、リレーと抵抗とを並列に接続した突入電流抑制回路が設けられており、電源投入時には、抵抗を介して突入電流を抑制しつつ平滑コンデンサを充電し、突入電流の安定後に、リレーをオンしてリレー接点側を通電させるようにしている。   Conventionally, in an air conditioner equipped with an inverter circuit, an inrush current suppression circuit in which a relay and a resistor are connected in parallel is provided to suppress an excessive inrush current flowing into a smoothing capacitor that is not charged when the power is turned on. When the power is turned on, the smoothing capacitor is charged through the resistor while suppressing the inrush current, and after the inrush current is stabilized, the relay is turned on to energize the relay contact side.

一方、リレーの溶着や不動作が発生した場合、電源投入時にインバータ回路に突入電流が流れる、あるいは、インバータ回路の運転時に抵抗に負荷電流が流れる虞がある。このため、例えば、リレー閉極制御後の入力電流を検出して予め設定された定常運転時の入力電流値と比較することにより、リレーの溶着や不動作を検出する技術が開示されている（例えば、特許文献１）。   On the other hand, when relay welding or malfunction occurs, an inrush current may flow through the inverter circuit when the power is turned on, or a load current may flow through the resistor during operation of the inverter circuit. For this reason, for example, a technique for detecting welding or non-operation of a relay by detecting an input current after relay closing control and comparing it with a preset input current value during steady operation is disclosed ( For example, Patent Document 1).

特開平５−１６４０５８号公報Japanese Patent Laid-Open No. 5-164058

しかしながら、上記従来技術では、リレーの溶着が発生している状態で電源投入した場合、リレー閉極制御後の入力電流を検出する前に、インバータ回路の通常運転を開始した時点でインバータ回路に突入電流が流れることとなり、インバータ回路に突入電流が流れることを未然に防ぐことができない、という問題があった。   However, in the above prior art, when the power is turned on while the relay is welded, the inverter circuit enters the inverter circuit at the time when the inverter circuit starts normal operation before detecting the input current after the relay closing control. There is a problem that current flows, and it is impossible to prevent inrush current from flowing through the inverter circuit.

本発明は、上記に鑑みてなされたものであって、インバータ回路の通常運転開始前にリレーの溶着や不動作を確実に検出して、インバータ回路に突入電流が流れることやリレーと並列に接続された抵抗に過大な負荷電流が流れることを未然に防ぐことができる空気調和機を提供することを目的とする。   The present invention has been made in view of the above, and reliably detects welding or non-operation of the relay before starting normal operation of the inverter circuit, and inrush current flows through the inverter circuit or is connected in parallel with the relay. It is an object of the present invention to provide an air conditioner that can prevent an excessive load current from flowing through a resistor.

上述した課題を解決し、目的を達成するため、本発明にかかる空気調和機の制御装置は、交流電源から供給される商用交流電圧を整流する整流回路と、前記整流回路により整流された直流電圧を平滑する平滑コンデンサと、前記平滑コンデンサにより平滑された前記直流電圧を交流電圧に変換して、圧縮機を駆動するモータに供給するインバータ回路と、前記整流回路と前記平滑コンデンサとの間に直列に接続されたリレーおよび該リレーに並列に接続された突入電流防止抵抗を具備した突入電流抑制回路と、前記リレーを駆動するリレー駆動手段と、前記直流電圧を検出する直流電圧検出手段と、前記インバータ回路を駆動するインバータ駆動手段と、前記リレー駆動手段および前記インバータ駆動手段を制御する制御手段と、を備え、前記制御手段は、前記モータを駆動することなくモータ巻線に通電する拘束通電時において、前記リレーをオンに制御した際の前記直流電圧である第１の直流電圧値と前記リレーをオフに制御した際の前記直流電圧である第２の直流電圧値とに基づいて、前記リレーの接点の溶着あるいは不動作を検出することを特徴とする。   In order to solve the above-described problems and achieve the object, an air conditioner control device according to the present invention includes a rectifier circuit that rectifies a commercial AC voltage supplied from an AC power supply, and a DC voltage rectified by the rectifier circuit. A smoothing capacitor for smoothing, an inverter circuit for converting the DC voltage smoothed by the smoothing capacitor into an AC voltage and supplying the same to a motor for driving the compressor, and a series connection between the rectifier circuit and the smoothing capacitor A relay connected to the relay, an inrush current suppressing circuit including an inrush current preventing resistor connected in parallel to the relay, a relay driving means for driving the relay, a DC voltage detecting means for detecting the DC voltage, An inverter driving means for driving the inverter circuit; and a control means for controlling the relay driving means and the inverter driving means. The control means controls the first DC voltage value, which is the DC voltage when the relay is turned on, and the relay to be turned off when the energization is performed to energize the motor winding without driving the motor. The welding or non-operation of the contact of the relay is detected based on the second direct current voltage value which is the direct current voltage.

本発明によれば、インバータ回路の通常運転開始前にリレーの溶着や不動作を確実に検出して、インバータ回路に突入電流が流れることや突入電流防止抵抗に過大な負荷電流が流れることを未然に防ぐことができる、という効果を奏する。   According to the present invention, the welding or non-operation of the relay is surely detected before the normal operation of the inverter circuit is started, and an inrush current flows through the inverter circuit or an excessive load current flows through the inrush current prevention resistor. There is an effect that can be prevented.

図１は、実施の形態にかかる空気調和機の一構成例を示す図である。Drawing 1 is a figure showing an example of 1 composition of an air harmony machine concerning an embodiment. 図２は、実施の形態にかかる空気調和機の突入電流抑制回路異常検出処理の一例を示すフローチャートである。FIG. 2 is a flowchart illustrating an example of an inrush current suppression circuit abnormality detection process of the air conditioner according to the embodiment.

以下に添付図面を参照し、本発明の実施の形態にかかる空気調和機について説明する。なお、以下に示す実施の形態により本発明が限定されるものではない。   Hereinafter, an air conditioner according to an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below.

実施の形態．
図１は、実施の形態にかかる空気調和機の一構成例を示す図である。図１に示すように、実施の形態にかかる空気調和機は、室外機１００と、室内機２００と、空気調和機の運転および停止や運転モードの操作を行うリモコン１１とを具備して構成される。 Embodiment.
Drawing 1 is a figure showing an example of 1 composition of an air harmony machine concerning an embodiment. As shown in FIG. 1, the air conditioner according to the embodiment includes an outdoor unit 100, an indoor unit 200, and a remote controller 11 that operates and stops the air conditioner and operates the operation mode. The

室外機１００は、交流電源１から供給される商用交流電圧を整流する整流回路２と、整流回路２により整流された直流電圧を平滑する平滑コンデンサ７と、平滑コンデンサ７により平滑された直流電圧を交流電圧に変換して圧縮機４を駆動するモータに供給するインバータ回路３と、整流回路２と平滑コンデンサ７との間に直列に接続されたリレー５およびそのリレー５に並列に接続された突入電流防止抵抗６を具備した突入電流抑制回路１６と、リレー５を駆動するリレー駆動回路（リレー駆動手段）８と、直流電圧を検出する直流電圧検出回路（直流電圧検出手段）９と、インバータ回路３を駆動するインバータ駆動回路（インバータ駆動手段）１５と、リレー駆動回路８およびインバータ駆動回路１５を制御する室外機側制御回路（制御手段）１０と、室内機２００との間で相互通信を行うための室外機側通信回路１２ａとを備えている。   The outdoor unit 100 includes a rectifier circuit 2 that rectifies a commercial AC voltage supplied from the AC power source 1, a smoothing capacitor 7 that smoothes the DC voltage rectified by the rectifier circuit 2, and a DC voltage that is smoothed by the smoothing capacitor 7. An inverter circuit 3 that converts the AC voltage into a motor that drives the compressor 4, a relay 5 connected in series between the rectifier circuit 2 and the smoothing capacitor 7, and a rush connected in parallel to the relay 5 Inrush current suppression circuit 16 provided with current prevention resistor 6, relay drive circuit (relay drive means) 8 for driving relay 5, DC voltage detection circuit (DC voltage detection means) 9 for detecting DC voltage, and inverter circuit 3, an inverter drive circuit (inverter drive means) 15 for driving the motor 3, and an outdoor unit side control circuit (control) And means) 10, and an outdoor unit side communication circuit 12a for performing mutual communication with the indoor unit 200.

室内機２００は、室外機１００との間で相互通信を行うための室内機側通信回路１２ｂと、リモコン１１との間で相互通信を行うためのリモコン通信回路１３と、空気調和機全体の制御を行う室内機側制御回路１４とを備えている。   The indoor unit 200 includes an indoor unit side communication circuit 12b for performing mutual communication with the outdoor unit 100, a remote control communication circuit 13 for performing mutual communication with the remote controller 11, and control of the entire air conditioner. The indoor unit side control circuit 14 which performs is provided.

室内機側制御回路１４は、リモコン通信回路１３を介してリモコン１１からのユーザーの操作を受け付け、室内機側通信回路１２ｂおよび室外機１００の室外機側通信回路１２ａを介して室外機側制御回路１０との間で相互通信を行う。またリモコン１１には、空気調和機の運転状態を表示するリモコン表示部１７が設けられている。   The indoor unit side control circuit 14 receives a user operation from the remote controller 11 via the remote control communication circuit 13, and the outdoor unit side control circuit via the indoor unit side communication circuit 12b and the outdoor unit side communication circuit 12a of the outdoor unit 100. 10 to communicate with each other. In addition, the remote controller 11 is provided with a remote controller display unit 17 that displays the operating state of the air conditioner.

つぎに、図１に示した突入電流抑制回路１６を具備した構成における空気調和機の基本動作について説明する。   Next, the basic operation of the air conditioner in the configuration provided with the inrush current suppression circuit 16 shown in FIG. 1 will be described.

図１に示す構成の空気調和機では、一般に、リレー５としては、交流電源１の投入前にはオフとなるノーマリーオフ型のリレーが用いられる。交流電源１が投入されると、突入電流防止抵抗６を介して突入電流を抑制しつつ平滑コンデンサ７が充電され、インバータ回路３の運転を開始し、入力電流の安定後に、リレー５をオン制御してリレーを通電させ、通常運転に移行する。このとき、例えば、リレー５の接点が溶着していた場合、電源投入時においてインバータ回路３に突入電流が流れる虞がある。また、例えば、リレー５が不動作状態となっている場合、インバータ回路３が通常運転に移行した後にも突入電流防止抵抗６を介して負荷電流が流れ続ける虞がある。   In the air conditioner having the configuration shown in FIG. 1, generally a normally-off type relay that is turned off before the AC power supply 1 is turned on is used as the relay 5. When the AC power supply 1 is turned on, the smoothing capacitor 7 is charged while suppressing the inrush current via the inrush current preventing resistor 6, the operation of the inverter circuit 3 is started, and the relay 5 is turned on after the input current is stabilized. Then, energize the relay and shift to normal operation. At this time, for example, when the contact of the relay 5 is welded, an inrush current may flow through the inverter circuit 3 when the power is turned on. Further, for example, when the relay 5 is in an inoperative state, there is a possibility that the load current continues to flow through the inrush current preventing resistor 6 even after the inverter circuit 3 has shifted to the normal operation.

したがって、本実施の形態では、交流電源１を投入してからインバータ回路３の通常運転に移行する前に、圧縮機４内部のモータを駆動することなくモータ巻線に通電して圧縮機４を加熱することにより液冷媒を気化させて排出し、圧縮機４内部への液冷媒の滞留を防止する拘束通電を実施し、その拘束通電時において、リレー５の溶着や不動作を確実に検出して、インバータ回路３の通常運転開始後にインバータ回路３に突入電流が流れることや突入電流防止抵抗６に過大な負荷電流が流れることを未然に防ぐようにする。なお、拘束通電については公知技術であるので、ここではその詳細な説明は省略する。この拘束通電の手法により、本発明が限定されるものではない。   Therefore, in the present embodiment, before the inverter circuit 3 is shifted to the normal operation after the AC power source 1 is turned on, the motor winding is energized without driving the motor inside the compressor 4 and the compressor 4 is turned on. The liquid refrigerant is vaporized and discharged by heating, and the energization is performed to prevent the liquid refrigerant from staying inside the compressor 4, and the welding and non-operation of the relay 5 are reliably detected during the energization. Thus, it is possible to prevent an inrush current from flowing through the inverter circuit 3 and an excessive load current from flowing into the inrush current preventing resistor 6 after the normal operation of the inverter circuit 3 is started. In addition, since restraint energization is a well-known technique, the detailed description is abbreviate | omitted here. The present invention is not limited by this method of restraint energization.

つぎに、本実施の形態にかかる空気調和機の突入電流抑制回路異常検出処理について、図１および図２を参照して説明する。図２は、実施の形態にかかる空気調和機の突入電流抑制回路異常検出処理の一例を示すフローチャートである。   Next, inrush current suppression circuit abnormality detection processing of the air conditioner according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 2 is a flowchart illustrating an example of an inrush current suppression circuit abnormality detection process of the air conditioner according to the embodiment.

交流電源１の投入後、まず、室外機側制御回路１０は、リレー５をオンに制御して（ステップＳＴ１０１）、拘束通電を開始する（ステップＳＴ１０２）。そして、室外機側制御回路１０は、リレー５をオンに制御した際の直流電圧である第１の直流電圧値Ｖｄｃ（ｏｎ）を読み込む（ステップＳＴ１０３）。   After the AC power supply 1 is turned on, the outdoor unit side control circuit 10 first controls the relay 5 to be turned on (step ST101) and starts restraint energization (step ST102). And the outdoor unit side control circuit 10 reads the 1st DC voltage value Vdc (on) which is a DC voltage at the time of controlling the relay 5 to ON (step ST103).

続いて、室外機側制御回路１０は、リレー５をオフに制御して（ステップＳＴ１０４）、リレー５をオフに制御した際の直流電圧である第２の直流電圧値Ｖｄｃ（ｏｆｆ）を読み込み（ステップＳＴ１０５）、リレー５をオンに制御して（ステップＳＴ１０６）、通常運転時の状態に移行させる。   Subsequently, the outdoor unit side control circuit 10 controls the relay 5 to be turned off (step ST104), and reads a second DC voltage value Vdc (off) that is a DC voltage when the relay 5 is controlled to be turned off ( Step ST105), the relay 5 is controlled to be on (step ST106), and the state is shifted to the normal operation state.

そして、室外機側制御回路１０は、第１の直流電圧値Ｖｄｃ（ｏｎ）と第２の直流電圧値Ｖｄｃ（ｏｆｆ）とを比較する（ステップＳＴ１０７）。   Then, the outdoor unit side control circuit 10 compares the first DC voltage value Vdc (on) with the second DC voltage value Vdc (off) (step ST107).

ここで、リレー５が正常に動作している場合、第２の直流電圧値Ｖｄｃ（ｏｆｆ）は、第１の直流電圧値Ｖｄｃ（ｏｎ）よりも突入電流防止抵抗６による電圧降下分（Ｖｒ）だけ小さい値となる。つまり、第１の直流電圧値Ｖｄｃ（ｏｎ）が第２の直流電圧値Ｖｄｃ（ｏｆｆ）よりも大きい場合、すなわち、Ｖｄｃ（ｏｎ）−Ｖｄｃ（ｏｆｆ）＞ε（εは所定の微小値）を満たす場合には、リレー５の接点の溶着あるいは不動作が生じていないものと判定することができる。   Here, when the relay 5 is operating normally, the second DC voltage value Vdc (off) is less than the first DC voltage value Vdc (on) by the voltage drop (Vr) due to the inrush current prevention resistor 6. Only a small value is obtained. That is, when the first DC voltage value Vdc (on) is larger than the second DC voltage value Vdc (off), that is, Vdc (on) −Vdc (off)> ε (ε is a predetermined minute value). When it is satisfied, it can be determined that no welding or malfunction of the contact of the relay 5 has occurred.

一方、リレー５の接点の溶着あるいは不動作が生じている場合には、第１の直流電圧値Ｖｄｃ（ｏｎ）と第２の直流電圧値Ｖｄｃ（ｏｆｆ）とが常に略同値となる。   On the other hand, when welding or malfunction of the contact of the relay 5 occurs, the first DC voltage value Vdc (on) and the second DC voltage value Vdc (off) are always substantially the same value.

したがって、Ｖｄｃ（ｏｎ）−Ｖｄｃ（ｏｆｆ）＞εを満たす場合には（ステップＳＴ１０７；Ｙｅｓ）、室外機側制御回路１０は、リレー５の接点の溶着あるいは不動作が生じていないものと判定し、拘束通電を継続して（ステップＳＴ１０８）、室内機側制御回路１４から通常運転が指示されるまで待機する通常運転待機状態に移行し（ステップＳＴ１０９）、突入電流抑制回路異常検出処理を終了する。   Therefore, when Vdc (on) −Vdc (off)> ε is satisfied (step ST107; Yes), the outdoor unit side control circuit 10 determines that no contact welding or malfunction of the relay 5 has occurred. Then, the restraint energization is continued (step ST108), and a transition is made to a normal operation standby state where the normal operation is instructed from the indoor unit side control circuit 14 (step ST109), and the inrush current suppression circuit abnormality detection process is terminated. .

一方、Ｖｄｃ（ｏｎ）−Ｖｄｃ（ｏｆｆ）＞εを満たさない場合には（ステップＳＴ１０７；Ｎｏ）、室外機側制御回路１０は、リレー５の接点の溶着あるいは不動作が生じているものと判定する。   On the other hand, when Vdc (on) −Vdc (off)> ε is not satisfied (step ST107; No), the outdoor unit side control circuit 10 determines that the contact of the relay 5 is welded or does not operate. To do.

このとき、つまり、リレー５の接点の溶着あるいは不動作が生じている場合には、上述したように、第１の直流電圧値Ｖｄｃ（ｏｎ）と第２の直流電圧値Ｖｄｃ（ｏｆｆ）とが常に略同値となる。ここで、リレー５の接点の溶着が発生している場合、第１の直流電圧値Ｖｄｃ（ｏｎ）および第２の直流電圧値Ｖｄｃ（ｏｆｆ）は、リレー５が正常である場合にリレー５をオン制御したときの直流電圧値Ｖｄｃ（ｏｎ）’と略同値となる。   At this time, that is, when welding or malfunction of the contact of the relay 5 occurs, as described above, the first DC voltage value Vdc (on) and the second DC voltage value Vdc (off) are obtained. It is always about the same value. Here, when the contact of the relay 5 is welded, the first DC voltage value Vdc (on) and the second DC voltage value Vdc (off) are the same as those when the relay 5 is normal. It becomes substantially the same value as the DC voltage value Vdc (on) ′ when ON control is performed.

一方、リレー５の不動作が発生している場合、第１の直流電圧値Ｖｄｃ（ｏｎ）および第２の直流電圧値Ｖｄｃ（ｏｆｆ）は、リレー５が正常である場合にリレー５をオフ制御したときの直流電圧値Ｖｄｃ（ｏｆｆ）’と略同値となる。つまり、リレー５が正常である場合にリレー５をオフ制御したときの直流電圧値Ｖｄｃ（ｏｆｆ）’以上であり、且つ、リレー５が正常である場合にリレー５をオン制御したときの直流電圧値Ｖｄｃ（ｏｎ）’よりも小さい電圧閾値Ｖｃｏｍｐ、すなわち、Ｖｄｃ（ｏｆｆ）’≦Ｖｃｏｍｐ＜Ｖｄｃ（ｏｎ）’を満たす電圧閾値Ｖｃｏｍｐを予め室外機側制御回路１０に設定しておき、第１の直流電圧値Ｖｄｃ（ｏｎ）（あるいは、第２の直流電圧値Ｖｄｃ（ｏｆｆ））が電圧閾値Ｖｃｏｍｐよりも大きい場合、すなわち、Ｖｄｃ（ｏｎ）（≒Ｖｄｃ（ｏｆｆ））＞Ｖｃｏｍｐを満たす場合には、リレー５の接点の溶着が発生しているものと判別することができる。   On the other hand, when the relay 5 is not operating, the first DC voltage value Vdc (on) and the second DC voltage value Vdc (off) are controlled to turn off the relay 5 when the relay 5 is normal. It becomes substantially the same value as the DC voltage value Vdc (off) ′ at that time. That is, it is equal to or greater than the DC voltage value Vdc (off) ′ when the relay 5 is controlled to be off when the relay 5 is normal, and the DC voltage when the relay 5 is controlled to be on when the relay 5 is normal. A voltage threshold Vcomp that is smaller than the value Vdc (on) ′, that is, a voltage threshold Vcomp that satisfies Vdc (off) ′ ≦ Vcomp <Vdc (on) ′ is set in the outdoor unit side control circuit 10 in advance. When the DC voltage value Vdc (on) (or the second DC voltage value Vdc (off)) is larger than the voltage threshold value Vcomp, that is, when Vdc (on) (≈Vdc (off))> Vcomp is satisfied. Therefore, it can be determined that the contact of the relay 5 is welded.

一方、第１の直流電圧値Ｖｄｃ（ｏｎ）（あるいは、第２の直流電圧値Ｖｄｃ（ｏｆｆ））が電圧閾値Ｖｃｏｍｐ以下である場合、すなわち、Ｖｄｃ（ｏｎ）（≒Ｖｄｃ（ｏｆｆ））＞Ｖｃｏｍｐを満たさない場合（つまり、Ｖｄｃ（ｏｎ）（≒Ｖｄｃ（ｏｆｆ））≦Ｖｃｏｍｐ）には、リレー５の不動作が発生しているものと判別することができる。   On the other hand, when the first DC voltage value Vdc (on) (or the second DC voltage value Vdc (off)) is equal to or lower than the voltage threshold Vcomp, that is, Vdc (on) (≈Vdc (off))> Vcomp If the above condition is not satisfied (that is, Vdc (on) (≈Vdc (off)) ≦ Vcomp), it can be determined that the relay 5 is not operating.

したがって、本実施の形態では、Ｖｄｃ（ｏｎ）＞Ｖｃｏｍｐを満たす場合には（ステップＳＴ１１０；Ｙｅｓ）、室外機側制御回路１０は、リレー５の接点の溶着が発生しているものと判別すると共に、リモコン１１のリモコン表示部１７にリレー５の接点の溶着が発生したことを示す表示を行い（ステップＳＴ１１１）、拘束通電を停止し（ステップＳＴ１１２）、通常運転への移行を禁止して（ステップＳＴ１１３）、突入電流抑制回路異常検出処理を終了する。   Therefore, in this embodiment, when Vdc (on)> Vcomp is satisfied (step ST110; Yes), the outdoor unit side control circuit 10 determines that the contact of the relay 5 is welded. Then, the remote control display 17 of the remote controller 11 displays that the contact of the relay 5 has been welded (step ST111), stops the energization of restraint (step ST112), and prohibits the transition to the normal operation (step ST112). ST113), the inrush current suppression circuit abnormality detection process is terminated.

一方、Ｖｄｃ（ｏｎ）＞Ｖｃｏｍｐを満たさない場合（つまり、Ｖｄｃ（ｏｎ）≦Ｖｃｏｍｐ）には（ステップＳＴ１１０；Ｎｏ）、室外機側制御回路１０は、リレー５の不動作が発生しているものと判別すると共に、リモコン１１のリモコン表示部１７にリレー５の不動作が発生したことを示す表示を行い（ステップＳＴ１１４）、拘束通電を停止し（ステップＳＴ１１２）、通常運転への移行を禁止して（ステップＳＴ１１３）、突入電流抑制回路異常検出処理を終了する。   On the other hand, when Vdc (on)> Vcomp is not satisfied (that is, Vdc (on) ≦ Vcomp) (step ST110; No), the outdoor unit side control circuit 10 has the relay 5 not operating. Is displayed on the remote control display 17 of the remote control 11 to indicate that the relay 5 has not been operated (step ST114), the energization of the restraint is stopped (step ST112), and the shift to the normal operation is prohibited. (Step ST113), the inrush current suppression circuit abnormality detection process is terminated.

なお、上述したステップＳＴ１０９では、Ｖｄｃ（ｏｎ）＞Ｖｃｏｍｐを満たすか否かにより、リレー５の故障状態を判別する例を示したが、上述したように、リレー５の接点の溶着あるいは不動作が発生している場合には、第１の直流電圧値Ｖｄｃ（ｏｎ）と第２の直流電圧値Ｖｄｃ（ｏｆｆ）とが常に略同値となる。したがって、Ｖｄｃ（ｏｆｆ）＞Ｖｃｏｍｐを満たすか否かにより、リレー５の故障状態を判別するようにしてもよいことは言うまでもない。   In step ST109 described above, an example in which the failure state of the relay 5 is determined based on whether or not Vdc (on)> Vcomp is satisfied has been described. However, as described above, welding or non-operation of the contact of the relay 5 has occurred. When it occurs, the first DC voltage value Vdc (on) and the second DC voltage value Vdc (off) are always substantially the same value. Therefore, it goes without saying that the failure state of the relay 5 may be determined depending on whether or not Vdc (off)> Vcomp is satisfied.

以上説明したように、実施の形態の空気調和機によれば、交流電源を投入してからインバータ回路の通常運転に移行する前に、圧縮機内部のモータを駆動することなくモータ巻線に通電して圧縮機を加熱することにより液冷媒を気化させて排出し、圧縮機内部への液冷媒の滞留を防止する拘束通電を実施し、その拘束通電時において、リレーをオンに制御した際の直流電圧である第１の直流電圧値と、リレーをオフに制御した際の直流電圧である第２の直流電圧値とを比較して、第１の直流電圧値が第２の直流電圧値よりも大きい場合には、リレーの接点の溶着あるいは不動作が生じていないものと判定して通常運転待機状態に移行し、第１の直流電圧値と第２の直流電圧値とが略同値となる場合には、リレーの接点の溶着あるいは不動作が生じているものと判定して、拘束通電を停止させ、通常運転への移行を禁止するようにしたので、インバータ回路の通常運転開始前にリレーの溶着や不動作を確実に検出することができ、インバータ回路の通常運転開始後にインバータ回路に突入電流が流れることや突入電流防止抵抗に過大な負荷電流が流れることを未然に防ぐことが可能となる。   As described above, according to the air conditioner of the embodiment, the motor winding is energized without driving the motor inside the compressor before the inverter circuit is shifted to the normal operation after the AC power is turned on. When the compressor is heated, the liquid refrigerant is vaporized and discharged, and the restraint energization is performed to prevent the liquid refrigerant from staying inside the compressor, and the relay is turned on during the restraint energization. The first DC voltage value, which is a DC voltage, is compared with the second DC voltage value, which is the DC voltage when the relay is controlled to be turned off, so that the first DC voltage value is greater than the second DC voltage value. Is larger, it is determined that there is no welding or malfunction of the relay contact, and the normal operation standby state is entered, and the first DC voltage value and the second DC voltage value become substantially the same value. If the relay contacts are not welded or Since the restraint energization is stopped and the transition to normal operation is prohibited, it is possible to reliably detect relay welding and non-operation before starting normal operation of the inverter circuit. Thus, it is possible to prevent an inrush current from flowing through the inverter circuit after the start of normal operation of the inverter circuit and an excessive load current from flowing into the inrush current prevention resistor.

また、リレーが正常である場合にリレーをオフ制御したときの直流電圧値以上であり、且つ、リレーが正常である場合にリレーをオン制御したときの直流電圧値よりも小さい電圧閾値を予め設定しておき、第１の直流電圧値および第２の直流電圧値が電圧閾値よりも大きい場合には、リレーの接点の溶着が発生しているものと判定して、リモコン表示部にリレーの接点の溶着が発生したことを示す表示を行い、第１の直流電圧値および第２の直流電圧値が電圧閾値以下である場合には、リレーの不動作が発生しているものと判定して、リモコン表示部にリレーの不動作が発生したことを示す表示を行うようにしたので、リレーの故障状態をユーザーに報知することができ、サービス性およびメンテナンス性の向上を図ることができる。   In addition, a voltage threshold that is equal to or higher than the DC voltage value when the relay is turned off when the relay is normal and smaller than the DC voltage value when the relay is turned on when the relay is normal is set in advance. In addition, when the first DC voltage value and the second DC voltage value are larger than the voltage threshold value, it is determined that welding of the relay contact has occurred, and the relay contact is displayed on the remote control display unit. When the first DC voltage value and the second DC voltage value are equal to or lower than the voltage threshold value, it is determined that the relay is not operating. Since the display indicating that the relay malfunction has occurred is displayed on the remote control display unit, the failure state of the relay can be notified to the user, and serviceability and maintenance performance can be improved.

なお、以上の実施の形態に示した構成は、本発明の構成の一例であり、別の公知の技術と組み合わせることも可能であるし、本発明の要旨を逸脱しない範囲で、一部を省略する等、変更して構成することも可能であることは言うまでもない。   Note that the configuration shown in the above embodiment is an example of the configuration of the present invention, and can be combined with another known technique, and a part thereof is omitted without departing from the gist of the present invention. Needless to say, it is possible to change the configuration.

１ 交流電源
２ 整流回路
３ インバータ回路
４ 圧縮機
５ リレー
６ 突入電流防止抵抗
７ 平滑コンデンサ
８ リレー駆動回路（リレー駆動手段）
９ 直流電圧検出回路（直流電圧検出手段）
１０ 室外機側制御回路（制御手段）
１１ リモコン
１２ａ 室外機側通信回路
１２ｂ 室内機側通信回路
１３ リモコン通信回路
１４ 室内機側制御回路
１５ インバータ制御回路
１６ 突入電流抑制回路
１７ リモコン表示部
１００ 室外機
２００ 室内機 DESCRIPTION OF SYMBOLS 1 AC power supply 2 Rectifier circuit 3 Inverter circuit 4 Compressor 5 Relay 6 Inrush current prevention resistance 7 Smoothing capacitor 8 Relay drive circuit (relay drive means)
9 DC voltage detection circuit (DC voltage detection means)
10 Outdoor unit side control circuit (control means)
DESCRIPTION OF SYMBOLS 11 Remote control 12a Outdoor unit side communication circuit 12b Indoor unit side communication circuit 13 Remote control communication circuit 14 Indoor unit side control circuit 15 Inverter control circuit 16 Inrush current suppression circuit 17 Remote control display unit 100 Outdoor unit 200 Indoor unit

Claims (6)

交流電源から供給される商用交流電圧を整流する整流回路と、
前記整流回路により整流された直流電圧を平滑する平滑コンデンサと、
前記平滑コンデンサにより平滑された前記直流電圧を交流電圧に変換して、圧縮機を駆動するモータに供給するインバータ回路と、
前記整流回路と前記平滑コンデンサとの間に直列に接続されたリレーおよび該リレーに並列に接続された突入電流防止抵抗を具備した突入電流抑制回路と、
前記リレーを駆動するリレー駆動手段と、
前記直流電圧を検出する直流電圧検出手段と、
前記インバータ回路を駆動するインバータ駆動手段と、
前記リレー駆動手段および前記インバータ駆動手段を制御する制御手段と、
を備え、
前記制御手段は、
前記モータを駆動することなくモータ巻線に通電する拘束通電時において、前記リレーをオンに制御した際の前記直流電圧である第１の直流電圧値と前記リレーをオフに制御した際の前記直流電圧である第２の直流電圧値とに基づいて、前記リレーの接点の溶着あるいは不動作を検出することを特徴とする空気調和機。 A rectifier circuit for rectifying commercial AC voltage supplied from an AC power source;
A smoothing capacitor for smoothing the DC voltage rectified by the rectifier circuit;
An inverter circuit that converts the DC voltage smoothed by the smoothing capacitor into an AC voltage and supplies the AC voltage to a motor that drives the compressor;
An inrush current suppression circuit comprising a relay connected in series between the rectifier circuit and the smoothing capacitor, and an inrush current preventing resistor connected in parallel to the relay;
Relay driving means for driving the relay;
DC voltage detection means for detecting the DC voltage;
Inverter driving means for driving the inverter circuit;
Control means for controlling the relay driving means and the inverter driving means;
With
The control means includes
The first direct current voltage value that is the direct current voltage when the relay is controlled to be turned on and the direct current when the relay is controlled to be turned off at the time of restraint energization for energizing the motor winding without driving the motor An air conditioner that detects welding or non-operation of the relay contacts based on a second DC voltage value that is a voltage. 前記制御手段は、前記第１の直流電圧値および前記第２の直流電圧値と予め設定した電圧閾値との比較結果に基づいて、前記リレーの接点の溶着が発生しているか、あるいは、前記リレーの不動作が発生しているかを判別することを特徴とする請求項１に記載の空気調和機。   The control means is based on a comparison result between the first DC voltage value and the second DC voltage value and a preset voltage threshold value, or whether the relay contact is welded, or the relay The air conditioner according to claim 1, wherein it is determined whether or not malfunction occurs. 前記制御手段は、前記第１の直流電圧値が前記電圧閾値以下である場合に、前記リレーの不動作が発生していると判別することを特徴とする請求項２に記載の空気調和機。   The air conditioner according to claim 2, wherein the control unit determines that the relay is not operating when the first DC voltage value is equal to or less than the voltage threshold value. 前記制御手段は、前記第２の直流電圧値が前記電圧閾値よりも大きい場合に、前記リレーの接点の溶着が発生していると判別することを特徴とする請求項２または３に記載の空気調和機。   4. The air according to claim 2, wherein the control means determines that welding of the contact of the relay is occurring when the second DC voltage value is larger than the voltage threshold value. 5. Harmony machine. 前記制御手段は、前記リレーの接点の溶着あるいは不動作を検出した際に、前記拘束通電を停止することを特徴とする請求項１〜４のいずれか一項に記載の空気調和機。   The air conditioner according to any one of claims 1 to 4, wherein the control unit stops the energizing energization when detecting welding or non-operation of the contact of the relay. 前記制御手段は、前記リレーの接点の溶着あるいは不動作を検出した際に、当該空気調和機のリモコン表示部に前記リレーの接点の溶着あるいは不動作が発生したことを表示することを特徴とする請求項１〜５のいずれか一項に記載の空気調和機。   The control means, when detecting welding or non-operation of the relay contact, displays that the relay contact welding or non-operation occurs on the remote control display unit of the air conditioner. The air conditioner as described in any one of Claims 1-5.
JP2012090189A 2012-04-11 2012-04-11 Air conditioner Pending JP2013219976A (en)

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