JP5370110B2 - Air conditioner communication circuit - Google Patents

Air conditioner communication circuit Download PDF

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JP5370110B2
JP5370110B2 JP2009275121A JP2009275121A JP5370110B2 JP 5370110 B2 JP5370110 B2 JP 5370110B2 JP 2009275121 A JP2009275121 A JP 2009275121A JP 2009275121 A JP2009275121 A JP 2009275121A JP 5370110 B2 JP5370110 B2 JP 5370110B2
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indoor
outdoor
shield
communication
overcurrent
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JP2011117658A (en
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豊和 志水
淳一 佐藤
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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本発明は、室内機と室外機間で、同一接続線にて通信を行う空気調和機の通信回路の保護と通信異常の回避に関するものである。   The present invention relates to protection of a communication circuit of an air conditioner that performs communication on an identical connection line between an indoor unit and an outdoor unit, and avoidance of communication abnormality.

従来、この種の回路としては、室内機又は室外機のどちらか一方から電源が供給され、電源の投入と同時に室内機と室外機の通信回路が接続され、互いに通信が行われるものであった（例えば、特許文献１参照）。   Conventionally, as this type of circuit, power is supplied from either the indoor unit or the outdoor unit, and when the power is turned on, the communication circuit of the indoor unit and the outdoor unit is connected to communicate with each other. (For example, refer to Patent Document 1).

図６は、特許文献１参照に記載された従来の通信回路を示すものである。図６に示すように、室外機と室内機の両機器間に交流主回路電流を供給しうる２本の電源線３，４と１本の通信線５を配設すると共に、電源線４，５の電圧からその電圧よりも低い通信用の直流電圧を得る直流電源回路７と、両機器側にそれぞれ直列に設けられた送信用および受信用フォトカプラＰＣ１、ＰＣ２、ＰＣ１´、ＰＣ２´とを備え、室内ユニット１の送信用および受信用フォトカプラＰＣ１、ＰＣ２は、通信線５を介して室外ユニットの送信用および受信用フォトカプラＰＣ１´、ＰＣ２´と直列に接続され、かつ直流電源回路７の出力端に接続され、さらに通信線５には、通信用の直流電源電圧を上回る電圧が印加された時に保護するツェナーダイオードＺＤ、ＺＤ´から構成されている。   FIG. 6 shows a conventional communication circuit described in Patent Document 1. As shown in FIG. 6, two power lines 3, 4 and one communication line 5 capable of supplying an AC main circuit current are disposed between both the outdoor unit and the indoor unit, and the power line 4, A DC power supply circuit 7 that obtains a communication DC voltage lower than that voltage from the voltage 5 and transmission and reception photocouplers PC1, PC2, PC1 ′, PC2 ′ provided in series on both devices, respectively. The transmission and reception photocouplers PC1 and PC2 of the indoor unit 1 are connected in series to the transmission and reception photocouplers PC1 ′ and PC2 ′ of the outdoor unit via the communication line 5, and are connected to the DC power supply circuit 7. Further, the communication line 5 is composed of Zener diodes ZD and ZD ′ that are protected when a voltage exceeding the communication DC power supply voltage is applied.

特開２００２−３９６０３号公報JP 2002-39603 A

しかしながら、上記従来の構成において、室外機と室内機間にシールド線が用いられている場合には、ＥＭＣノイズ対策のため、シールド線のシールドアースが室内機の本体に接続される。このシールドアースは、室内機の本体アースに接続されることになる。この本体アースが大地に対してインピータンスが有った場合、室内機と室外機間のアース電位に差が生じて、シールド線のシールドアースに電流が流れることにより、シールド線の線間容量により通信電線側に誘導電圧が生じて過電圧を発生させる。特に、雷などのサージ電流が発生したときや、本体アース線に別機器の漏れ電流が流れた場合などで、この過電圧により通信モジュール７，８には過電圧が直接印加されるので、図６の破線→のラインに従って過電流が流れてフォトホトカプラやツェナーダイオードＺＤ、ＺＤ´が破壊されるという課題を有していた。   However, in the above-described conventional configuration, when a shield wire is used between the outdoor unit and the indoor unit, the shield ground of the shield wire is connected to the main body of the indoor unit in order to prevent EMC noise. This shield ground is connected to the main body ground of the indoor unit. When this main unit ground has an impedance with respect to the ground, a difference occurs in the ground potential between the indoor unit and the outdoor unit, and current flows through the shielded ground of the shielded wire. An induced voltage is generated on the communication wire side to generate an overvoltage. In particular, when a surge current such as lightning occurs or when a leakage current of another device flows through the main body grounding wire, the overvoltage is directly applied to the communication modules 7 and 8 due to this overvoltage. There is a problem that an overcurrent flows according to the broken line → line and the photophotocoupler and the Zener diodes ZD and ZD ′ are destroyed.

本発明は、前記従来の発明を解決するものであり、室外機と室内機の通信線にシールド線が用いられた場合でも、通信回路が破壊しない通信回路を提供することを目的とする。   The present invention solves the above-described conventional invention, and an object thereof is to provide a communication circuit in which a communication circuit is not destroyed even when a shield line is used as a communication line between an outdoor unit and an indoor unit.

前記課題を解決するため、本発明の通信回路は、室外電源端子と、室外通信端子と、室外通信手段と、直流電源手段と、室外通信保護手段と、室外シールド電流検知手段と、室外制御手段と、アース端子とからなる室外機と、室内電源端子と、室内通信端子と、室内通信手段と、室内通信保護手段と、室内シールド電流検知手段と、室内制御手段と、室内側アース端子を設けたものである。   In order to solve the above-mentioned problems, the communication circuit of the present invention includes an outdoor power supply terminal, an outdoor communication terminal, an outdoor communication means, a DC power supply means, an outdoor communication protection means, an outdoor shield current detection means, and an outdoor control means. And an outdoor unit comprising a ground terminal, an indoor power supply terminal, an indoor communication terminal, an indoor communication means, an indoor communication protection means, an indoor shield current detection means, an indoor control means, and an indoor ground terminal. It is a thing.

これにより、通信線のシールド線に過電流が流れた場合でも、通信回路の破壊を無くす
ようにする。 Thereby, even when an overcurrent flows through the shield line of the communication line, destruction of the communication circuit is eliminated.

本発明の通信回路は、シールド線の電流を監視することにより、シールド線に過電流が発生した場合、通信回路を遮断することにより、通信回路の損傷を避けることができる。   The communication circuit according to the present invention can avoid damage to the communication circuit by monitoring the current of the shield line and shutting off the communication circuit when an overcurrent occurs in the shield line.

本発明の実施の形態１における空気調和機の構成ブロック図Configuration block diagram of an air conditioner in Embodiment 1 of the present invention 本発明の実施の形態２における空気調和機の構成ブロック図Configuration block diagram of an air conditioner in 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構成ブロック図Configuration block diagram of an air conditioner in 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構成ブロック図Configuration block diagram of an air conditioner in 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構成ブロック図Configuration block diagram of an air conditioner in Embodiment 5 of the present invention 従来の空気調和機の構成ブロック図Configuration block diagram of a conventional air conditioner

第１の発明は、室外電源端子と、室外通信端子と、室外制御手段と、室外通信手段と、直流電源手段と、室外通信保護手段と、室外シールド電流検知手段と、室外シールドアースと、室外本体アースからなる室外機と、室内電源端子と、室内通信端子と、室内通信手段と、室内通信保護手段と、室内シールド電流検知手段と、室内シールドアースと、室内本体アースからなる室内機からなり、電源投入後、室外制御手段は、電源投入一定時間後に、室外通信保護手段を復帰させる。その後、室内制御手段は、室内通信保護手段を復帰させて、室外機と室内機の通信を開始させる。通信開始と同時に、直流電源手段の電源も通信線に供給される。次に、室外シールド電流検知手段と、室内機の室内シールド電流検知手段は、シールド線の各シールドアース側を流れる電流の検知を行う。シールド線のシールドアースに電流が流れていることを検知した場合、その電流値を室内制御手段と室外制御手段に伝える。この電流が通信回路の破壊に達するレベルであると判断したとき、室内制御手段、室外制御手段は、室外通信保護手段と、室外通信保護手段を動作させて、再度過電流が無くなるまでオフする。以上によりシールド線の過電流による通信回路の保護を行うことにより、シールドアースの影響による通信回路の発煙、発火を防止し、誘導による通信線への過電圧による通信回路の破壊や通信異常を避けるものである。   The first invention includes an outdoor power supply terminal, an outdoor communication terminal, an outdoor control means, an outdoor communication means, a DC power supply means, an outdoor communication protection means, an outdoor shield current detection means, an outdoor shield ground, an outdoor An outdoor unit consisting of a main unit ground, an indoor power supply terminal, an indoor communication terminal, an indoor communication unit, an indoor communication protection unit, an indoor shield current detection unit, an indoor shield ground, and an indoor unit consisting of an indoor main unit ground. After the power is turned on, the outdoor control means returns the outdoor communication protection means after a predetermined time after the power is turned on. Thereafter, the indoor control means returns the indoor communication protection means to start communication between the outdoor unit and the indoor unit. Simultaneously with the start of communication, the power of the DC power supply means is also supplied to the communication line. Next, the outdoor shield current detection means and the indoor shield current detection means of the indoor unit detect the current flowing through each shield ground side of the shield wire. When it is detected that a current flows through the shield ground of the shield wire, the current value is transmitted to the indoor control means and the outdoor control means. When it is determined that this current is at a level that reaches the destruction of the communication circuit, the indoor control means and the outdoor control means operate the outdoor communication protection means and the outdoor communication protection means and turn off again until there is no overcurrent. By protecting the communication circuit due to the overcurrent of the shielded wire as described above, it prevents smoke and fire of the communication circuit due to the influence of the shield ground, and avoids the destruction of the communication circuit and the communication abnormality due to overvoltage to the communication wire due to induction. It is.

第２の発明は、第１の発明の通信回路において、室内機に異常表示復帰手段を設け、シールド線のシールドアースに過電流が発生した場合、通信保護手段を動作させるとともに、異常表示復帰手段により過電流異常であることを表示する。次に、過電流箇所が取り除かれ異常箇所が取り除かれて異常が解除された場合は、異常表示復帰手段により異常解除信号を室内制御手段に送り、室内シールド電流検知手段からの信号が解除され、異常なしの状態である場合に通信保護手段を復帰させ、異常表示復帰手段の表示を解除することにより、室内外の通信を復活させることにより、通信回路の破壊や通信異常を避けることができる。   According to a second aspect of the present invention, in the communication circuit of the first aspect, an abnormality display return means is provided in the indoor unit, and when an overcurrent occurs in the shield ground of the shield wire, the communication protection means is operated and the abnormality display return means Is displayed to indicate an overcurrent abnormality. Next, if the overcurrent part is removed and the abnormal part is removed and the abnormality is released, the abnormality display return means sends an abnormality release signal to the indoor control means, and the signal from the indoor shield current detection means is released, When the communication protection means is restored in the absence of an abnormality and the display of the abnormality display restoration means is canceled to restore the indoor / outdoor communication, the destruction of the communication circuit and the communication abnormality can be avoided.

第３の発明は、第１の発明と第２の発明に記載の通信回路において、室外シールドアース切替手段と、室内シールドアースの切替手段を設けて、室内機と室外機の各シールド電流検知手段が、シールドアースの過電流を検知すると、それぞれのシールドアースの切替手段によりアース側の接地を切り離すことにより、通信回路の破壊や通信異常を避けるものである。   According to a third invention, in the communication circuit according to the first and second inventions, an outdoor shield earth switching means and an indoor shield earth switching means are provided, and each shield current detection means of the indoor unit and the outdoor unit is provided. However, when an overcurrent of the shield ground is detected, the ground side ground is disconnected by the respective shield ground switching means, thereby avoiding the destruction of the communication circuit and the communication abnormality.

第４の発明は、第１の発明から第３の発明のいずれかの通信回路において、室外シールド線のアース接地点と通信回路の間の電圧を検知して、過電流が流れていて、電圧差が大きい場合には、電圧に応じて通信回路保護抵抗を切り換えることにより、通信回路の破壊や通信異常を避けるものである。   According to a fourth invention, in the communication circuit according to any one of the first to third inventions, the voltage between the ground ground point of the outdoor shield wire and the communication circuit is detected, an overcurrent flows, and the voltage When the difference is large, the communication circuit protection resistor is switched in accordance with the voltage to avoid destruction of the communication circuit and communication abnormality.

第５の発明は、第１の発明から第４の発明のいずれかの発明の通信回路において室内機とに室外機に復帰自動タイマーを設けておき、各シールド電流検知手段が過電流を検知しなくなった後、一定時間ごとに通信保護手段を復帰させて過電流の解除を確認する。過電流が無くなったと判断すると、通信保護手段を復帰させることにより、通信回路の破壊を防止するとともに通信の自動解除を行うことができる。   According to a fifth aspect of the present invention, in the communication circuit according to any one of the first to fourth aspects of the invention, a return automatic timer is provided in the outdoor unit to the indoor unit, and each shield current detection means detects an overcurrent. After running out, check the release of overcurrent by returning the communication protection means at regular intervals. When it is determined that the overcurrent has disappeared, the communication protection means is restored, so that the communication circuit can be prevented from being destroyed and the communication can be automatically canceled.

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。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（実施の形態１）
図１は、本発明の実施の形態１における空気調和機の通信回路のブロック図である。同図において、図６と同じ構成要素については同じ符号を用い説明を省略する。 (Embodiment 1)
FIG. 1 is a block diagram of a communication circuit of an air conditioner according to Embodiment 1 of the present invention. In the figure, the same components as those in FIG.

図１において、室外制御手段１１と、室外通信手段１２と、室外電源手段１３と、室外通信保護手段（リレー等のスイッチ）１４と、室外シールド電流検知手段１５と、通信電源手段１６と、室外端子台１８と、室外本体アース１７と室外シールドアース４４とからなる室外機１と、室内制御手段２１と、室内通信手段２２と、室内電源手段２３と、室内通信保護手段（リレー等のスイッチ）２４と、室内シールド電流検知手段２５と、室内本体アース２７と、室内シールドアース４５とからなる室内機２からなる。   In FIG. 1, an outdoor control means 11, an outdoor communication means 12, an outdoor power supply means 13, an outdoor communication protection means (switch such as a relay) 14, an outdoor shield current detection means 15, a communication power supply means 16, an outdoor The outdoor unit 1 comprising the terminal block 18, the outdoor body ground 17 and the outdoor shield ground 44, the indoor control means 21, the indoor communication means 22, the indoor power supply means 23, and the indoor communication protection means (switches such as relays) 24, the indoor shield current detection means 25, the indoor body ground 27, and the indoor shield ground 45.

以上のように構成された空気調和機の室外機１は室外通信手段１２により室内機２に通信を行うとともに、通信電源手段１６により室内機２側に通信用の電力を供給し、室内機２は、この電力を室内通信手段２２により受電し、この電力により室内通信手段２２が動作することにより、室内制御手段２３は、室外機１と通信を開始した後、シールド線の室外シールドアース４４に室外シールド電流検知手段１５により過電流を検知した場合に、室外検知手段１１は室外通信保護手段１４を動作（リレーをオフ）させる。また、同様に室内シールド電流検知手段２５により室内シールドアース４５の過電流を検知した場合、室内制御手段２１は、室内通信保護手段２４動作（リレーをオフ）させることにより、室外通信手段１２と、室内通信手段２２の通信回路の破壊や通信異常を避けることができる。   The outdoor unit 1 of the air conditioner configured as described above communicates with the indoor unit 2 by the outdoor communication unit 12 and supplies communication power to the indoor unit 2 side by the communication power source unit 16. The electric power is received by the indoor communication means 22, and the indoor communication means 22 is operated by this electric power, so that the indoor control means 23 starts communication with the outdoor unit 1 and then connects to the outdoor shield earth 44 of the shield wire. When the overcurrent is detected by the outdoor shield current detection means 15, the outdoor detection means 11 operates the outdoor communication protection means 14 (relay is turned off). Similarly, when an overcurrent of the indoor shield earth 45 is detected by the indoor shield current detection means 25, the indoor control means 21 operates the indoor communication protection means 24 (relay is turned off) so that the outdoor communication means 12 and It is possible to avoid destruction of the communication circuit of the indoor communication means 22 and communication abnormality.

（実施の形態２）
図２は、本発明の実施の形態２における空気調和機の通信回路のブロック図である。同図において、図１と同じ構成要素については同じ符号を用い説明を省略する。
図２において、請求項２に記載の空気調和機の室内機２は、異常表示復帰手段２６からなる。 (Embodiment 2)
FIG. 2 is a block diagram of a communication circuit of the air conditioner according to Embodiment 2 of the present invention. In the figure, the same components as those in FIG.
In FIG. 2, the indoor unit 2 of the air conditioner according to claim 2 includes an abnormality display return means 26.

以上のように構成された室内機２の室内制御手段２１は、シールド線の室内シールドアース４５の過電流を検知した後に、異常表示復帰手段２６によりシールド線の異常の表示を行う。次に、シールド線のシールドアースの過電流が解除したことを検知した室内制御手段２１は、異常表示復帰手段２６により復帰信号が入力されたとき、室内通信保護手段２４を復帰（リレーをオン）させことにより室外機１との通信を再開する。   The indoor control means 21 of the indoor unit 2 configured as described above displays an abnormality of the shield line by the abnormality display return means 26 after detecting an overcurrent of the indoor shield earth 45 of the shield line. Next, the indoor control means 21 that detects that the overcurrent of the shield ground of the shield wire has been released returns the indoor communication protection means 24 (relay is turned on) when the return signal is input by the abnormality display return means 26. As a result, communication with the outdoor unit 1 is resumed.

（実施の形態３）
図３は、本発明の実施の形態３における空気調和機の通信回路のブロック図である。同図において、図２と同じ構成要素については同じ符号を用い説明を省略する。
図３において、請求項３に記載の空気調和機は、室外シールド切替手段１９、室内シールド切替手段２９からなる。 (Embodiment 3)
FIG. 3 is a block diagram of a communication circuit of the air conditioner according to Embodiment 3 of the present invention. In the figure, the same components as those in FIG.
In FIG. 3, the air conditioner according to claim 3 includes an outdoor shield switching means 19 and an indoor shield switching means 29.

以上のように構成された室外機１と室内機２は、室外シールド電流検知手段１５と室内
シールド電流検知手段２５からの異常検知状態により、所定以上の電流が流れた場合に
室外制御手段１１と室内制御手段２１により、室外シールド切替手段１９、室内シールド切替手段２９により、シールド線のシールドアースを本体アース接地側から切り離しを行うことにより、通信回路の破壊や通信異常を避けることができる。 The outdoor unit 1 and the indoor unit 2 configured as described above are configured so that the outdoor control unit 11 and the outdoor control unit 11 when the current exceeds a predetermined level due to the abnormality detection state from the outdoor shield current detection unit 15 and the indoor shield current detection unit 25. By disconnecting the shield ground of the shield wire from the main body grounding side by the indoor control means 21 and the outdoor shield switching means 19 and the indoor shield switching means 29, it is possible to avoid destruction of the communication circuit and communication abnormality.

（実施の形態４）
図４は、本発明の実施の形態４における空気調和機の通信回路のブロック図である。同図において、実施の形態３で説明した部分については同じ符号を用い説明を省略する。 (Embodiment 4)
FIG. 4 is a block diagram of a communication circuit of the air conditioner according to Embodiment 4 of the present invention. In the figure, the same reference numerals are used for the portions described in the third embodiment, and description thereof is omitted.

図４において、請求項１から請求項３に記載の通信回路は、室外機１と室内機２において、室外電圧検知手段４０、室外保護抵抗ａ３１と、室外保護抵抗ｂ３２と、室内電圧検知手段４１、室内保護抵抗ａ３３と、室内保護抵抗ｂ３４からなる。   4, the communication circuit according to any one of claims 1 to 3 includes, in the outdoor unit 1 and the indoor unit 2, an outdoor voltage detection means 40, an outdoor protection resistance a31, an outdoor protection resistance b32, and an indoor voltage detection means 41. The indoor protection resistor a33 and the indoor protection resistor b34.

以上のように構成された空気調和機の室外機１、室内機２の通信回路は、室外シールド電流検知手段１５により過電流が流れたと判断したときに、室外制御手段１１は、室外電圧検知手段４０により、通信線の電位とシールドアースの電位をＡＤ変換することにより電圧を検知し、その差分電圧または絶対値電圧により、室外保護抵抗ａ３１と室外保護抵抗ｂ３２を切り替える。検知電圧がさらに大きくなると室外通信保護手段１４を動作（リレーをオフ）させる。   When the communication circuit of the outdoor unit 1 and the indoor unit 2 of the air conditioner configured as described above determines that an overcurrent has flowed by the outdoor shield current detection unit 15, the outdoor control unit 11 includes the outdoor voltage detection unit. The voltage is detected by AD converting the potential of the communication line and the potential of the shield earth by 40, and the outdoor protection resistor a31 and the outdoor protection resistor b32 are switched by the differential voltage or the absolute value voltage. When the detected voltage further increases, the outdoor communication protection means 14 is operated (relay is turned off).

同様に、室内機２は、室内シールド電流検知手段２５により過電流が流れたと判断したときに、室内制御手段２１は、室内電圧検知手段４１により、通信線の電位とシールドアースの電位をＡＤ変換することにより電圧を検知し、その差分電圧または絶対値電圧により、室内保護抵抗ａ３３と室内保護抵抗ｂ３４を検知電圧により切り替える。検知電圧がさらに大きくなると室内通信保護手段２４を動作（リレーをオフ）させることにより、通信回路の破壊や通信異常を避けることができる。   Similarly, when the indoor unit 2 determines that an overcurrent has flowed by the indoor shield current detection means 25, the indoor control means 21 uses the indoor voltage detection means 41 to AD convert the potential of the communication line and the potential of the shield ground. Thus, the voltage is detected, and the indoor protection resistor a33 and the indoor protection resistor b34 are switched by the detection voltage based on the differential voltage or the absolute value voltage. When the detected voltage further increases, by operating the indoor communication protection means 24 (relay is turned off), it is possible to avoid the destruction of the communication circuit and the communication abnormality.

（実施の形態５）
図５は、本発明の実施の形態５における空気調和機の通信回路のブロック図である。同図において、実施の形態４で説明した部分については同じ符号を用い説明を省略する。図５において、請求項１から請求項４に記載の通信回路は、室外タイマー手段４２と室内タイマー手段４３からなる。 (Embodiment 5)
FIG. 5 is a block diagram of a communication circuit of an air conditioner according to Embodiment 5 of the present invention. In the figure, the same reference numerals are used for portions described in the fourth embodiment, and description thereof is omitted. In FIG. 5, the communication circuit according to claims 1 to 4 includes an outdoor timer means 42 and an indoor timer means 43.

以上のように構成された空気調和機の室外機１と室内機２の通信回路は、室外シールド電流検知手段１５、室内シールド電流検知手段２５によりシールド線のシールド側アースの過電流を検知したとき室外通信保護手段１４、室内通信保護手段２４を動作（リレーをオフ）させる。   When the communication circuit between the outdoor unit 1 and the indoor unit 2 of the air conditioner configured as described above detects an overcurrent of the shield side ground of the shield wire by the outdoor shield current detection unit 15 and the indoor shield current detection unit 25. The outdoor communication protection means 14 and the indoor communication protection means 24 are operated (relay is turned off).

室外機１と室内機２の室外タイマー手段４２と室内タイマー手段４３により、室外シールド過電流検知手段１５と、室内シールド電流検知手段２５が過電流を検知しなくなった後一定時間ごとに室外通信保護手段１４と室外通信保護手段２４を復帰（リレーをオン）させて過電流異常の解除を確認する。電流の検知が無くなれば、通信保護手段を復帰（リレーをオン）させることにより、通信回路の破壊や通信異常を避けることができる。   The outdoor timer unit 42 and the indoor timer unit 43 of the outdoor unit 1 and the indoor unit 2 protect the outdoor communication at regular intervals after the outdoor shield overcurrent detection unit 15 and the indoor shield current detection unit 25 no longer detect overcurrent. The means 14 and the outdoor communication protection means 24 are returned (relay is turned on) to confirm the cancellation of the overcurrent abnormality. If the current is not detected, the communication protection means is restored (relay is turned on), so that the communication circuit can be prevented from being broken or communication abnormality can be avoided.

以上のように、本発明にかかる通信回路は、２つに分離した機器間の通信回路のシールドアースに流れる過電流によって通信回路が破壊や通信異常を避けることができるので、タンク側とヒートポンプ側に分離した給湯機等の用途にも適用することができる。   As described above, since the communication circuit according to the present invention can prevent the communication circuit from being broken or abnormal due to the overcurrent flowing in the shield ground of the communication circuit between the two separated devices, the tank side and the heat pump side The present invention can also be applied to uses such as separated hot water heaters.

１ 室外機
１１ 室外制御手段
１２ 室外通信手段
１３ 室外電源手段
１４ 室外通信保護手段
１５ 室外シールド電流検知手段
１６ 通信電源手段
１７ 室外本体アース
１８ 室外端子台
１９ 室外シールド切替手段
２ 室内機
２１ 室内制御手段
２２ 室内通信手段
２３ 室内電源手段
２４ 室内通信保護手段
２５ 室内シールド電流検知手段
２６ 異常表示復帰手段
２７ 室内本体アース
２８ 室内端子台
２９ 室内シールド切替手段
３ シールド線
３１ 室外保護抵抗ａ
３２ 室外保護抵抗ｂ
３３ 室内保護抵抗ａ
３４ 室内保護抵抗ｂ
４０ 室外電圧検知手段
４１ 室内電圧検知手段
４２ 室外タイマー手段
４３ 室内タイマー手段
４４ 室外シールドアース
４５ 室内シールドアース DESCRIPTION OF SYMBOLS 1 Outdoor unit 11 Outdoor control means 12 Outdoor communication means 13 Outdoor power supply means 14 Outdoor communication protection means 15 Outdoor shield current detection means 16 Communication power supply means 17 Outdoor body ground 18 Outdoor terminal block 19 Outdoor shield switching means 2 Indoor unit 21 Indoor control means DESCRIPTION OF SYMBOLS 22 Indoor communication means 23 Indoor power supply means 24 Indoor communication protection means 25 Indoor shield current detection means 26 Abnormal display return means 27 Indoor body earth | ground 28 Indoor terminal block 29 Indoor shield switching means 3 Shield wire 31 Outdoor protection resistance a
32 Outdoor protection resistance b
33 Indoor protection resistance a
34 Indoor protection resistance b
40 Outdoor voltage detection means 41 Indoor voltage detection means 42 Outdoor timer means 43 Indoor timer means 44 Outdoor shield earth 45 Indoor shield earth

Claims (5)

室外通信手段と、室外通信保護手段と、室外シールド電流検知手段とからなる室外機と、室内通信手段と、室内通信保護手段と、室内シールド電流検知手段とからなる室内機で、室外機と室内機間の通信線にシールド線が用いられ、そのシールド線のシールドアースが室内機と室外機の両端で 接地接続されている空気調和機において、前記室外シールド電流検知手段がシールド線のシールドアースに過電流が流れたことを検知した場合には室外通信保護手段を動作させ、前記室内シールド電流検知手段が室内側シールド線のシールドアースに過電流が流れたことを検知した場合には室内通信保護手段を動作させることを特徴とする空気調和機の通信回路。 An outdoor unit comprising an outdoor communication means, an outdoor communication protection means, an outdoor shield current detection means, an indoor communication means, an indoor communication protection means, and an indoor shield current detection means. In an air conditioner in which a shielded wire is used as a communication line between units, and the shield ground of the shielded wire is grounded at both ends of the indoor unit and the outdoor unit, the outdoor shield current detection means is used as the shield ground of the shielded wire. When it detects that an overcurrent has flowed, it activates the outdoor communication protection means, and when the indoor shield current detection means detects that an overcurrent has flowed through the shield ground of the indoor shield wire, it protects the indoor communication. A communication circuit for an air conditioner, characterized by operating means. 室内機に異常表示復帰手段を有し、室外シールド電流検知手段、又は、室内シールド電流検知手段によりシールドアースに過電流を検知した後、過電流異常を表示するとともに、過電流が無くなった後、異常表示復帰手段により異常復帰させることにより、過電流異常の解除を行うことを特徴とする請求項１に記載の空気調和機の通信回路。 The indoor unit has an abnormality display return means, and after detecting an overcurrent to the shield ground by the outdoor shield current detection means or the indoor shield current detection means, an overcurrent abnormality is displayed, and after the overcurrent disappears, 2. The communication circuit for an air conditioner according to claim 1, wherein the overcurrent abnormality is canceled by causing the abnormality display returning means to return to an abnormality. 室外シールドアース切替手段と、室内シールドアース切替手段を設けて、室内機と室外機の各過電流検知手段がシールドアースの過電流を検知すると、室内機と室外機のそれぞれのシールドアース切替手段により、アース側の接地を切り離すことを特徴とする請求項１ないし請求項２に記載の空気調和機の通信回路。 An outdoor shield earth switching means and an indoor shield earth switching means are provided, and when each overcurrent detection means of the indoor unit and the outdoor unit detects an overcurrent of the shield earth, the respective shield earth switching means of the indoor unit and the outdoor unit 3. The communication circuit for an air conditioner according to claim 1, wherein the ground on the earth side is disconnected. 室外シールド線のシールドアース接地点と通信回路の間の電圧を検知して、過電流が流れていて、かつ電圧が大きい場合には、電圧に応じて通信保護抵抗を切り換えることを特徴とする請求項１から請求項３のいずれか１項に記載の空気調和機の通信回路。 The voltage between the shield earth ground point of the outdoor shielded wire and the communication circuit is detected, and when the overcurrent flows and the voltage is large, the communication protection resistor is switched according to the voltage. The communication circuit for an air conditioner according to any one of claims 1 to 3. 室内機と室外機に異常復帰タイマーを設けて、シールド線のアース側への過電流を検知しなくなった後、一定時間ごとに通信保護手段を復帰させて過電流異常の解除を確認し、過電流の検知が無くなれば通信保護手段を復帰させることを特徴とする請求項１から請求項４のいずれか１項に記載の空気調和機の通信回路。 Provide an error recovery timer for the indoor unit and outdoor unit, and after detecting the overcurrent to the ground side of the shielded wire, return the communication protection means at regular intervals to confirm the cancellation of the overcurrent error. The communication circuit for an air conditioner according to any one of claims 1 to 4, wherein the communication protection means is restored when no current is detected.
JP2009275121A 2009-12-03 2009-12-03 Air conditioner communication circuit Expired - Fee Related JP5370110B2 (en)

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