EP1158253A2 - Steuerschaltung für eine Klimaanlage - Google Patents

Steuerschaltung für eine Klimaanlage Download PDF

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Publication number
EP1158253A2
EP1158253A2 EP01109518A EP01109518A EP1158253A2 EP 1158253 A2 EP1158253 A2 EP 1158253A2 EP 01109518 A EP01109518 A EP 01109518A EP 01109518 A EP01109518 A EP 01109518A EP 1158253 A2 EP1158253 A2 EP 1158253A2
Authority
EP
European Patent Office
Prior art keywords
indoor
outdoor
machine
photo coupler
power source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01109518A
Other languages
English (en)
French (fr)
Other versions
EP1158253A3 (de
EP1158253B1 (de
Inventor
Kazuhiro Mitsubishi Elec. Eng. Co. Ltd. Kazama
Shigenobu Mitsubishi El. Eng. Co. Ltd. Mochizuki
Toshiya Mitsubishi El. Eng. Co. Ltd. Sugiyama
Hiroyasu Mitsubishi El. Eng. Co. Ltd. Yamada
Kazuyuki Mitsubishi El. Eng. Co. Ltd. Katayama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2000151377A external-priority patent/JP3598945B2/ja
Priority claimed from JP2000178435A external-priority patent/JP4288831B2/ja
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP1158253A2 publication Critical patent/EP1158253A2/de
Publication of EP1158253A3 publication Critical patent/EP1158253A3/de
Application granted granted Critical
Publication of EP1158253B1 publication Critical patent/EP1158253B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/52—Indication arrangements, e.g. displays

Definitions

  • This invention relates to the control circuit of a separate type air conditioner having an outdoor machine and at least one indoor machine.
  • Fig. 12 is an electric circuit diagram showing a conventional communication apparatus between indoor and outdoor machines of an air conditioner, described in Japanese Patent Application Laid-Open No. 11-193950, for example.
  • the air conditioner has one outdoor machine 1 and a plurality of indoor machines 2.
  • Each of the plurality of indoor machines 2 is connected to the outdoor machine 1 via three connection lines 3 in parallel with each other.
  • the outdoor machine 1 has a half-wave rectification DC power source circuit 12 connected between terminals of a commercial power source 10 (hereinafter to be referred to as an AC power source), an outdoor control DC power source 11 as outdoor control power source means connected between the terminals of the AC power source 10, an outdoor microcomputer 14 as outdoor control means, an outdoor transmission photo coupler 15 connected to a transmission port of the outdoor microcomputer 14, an outdoor reception photo coupler 16 connected to a reception port of the outdoor microcomputer 14, and a termination resistor 17 as first resistor means connected in parallel with the outdoor reception photo coupler 16.
  • a commercial power source 10 hereinafter to be referred to as an AC power source
  • an outdoor control DC power source 11 as outdoor control power source means connected between the terminals of the AC power source 10
  • an outdoor microcomputer 14 as outdoor control means
  • an outdoor transmission photo coupler 15 connected to a transmission port of the outdoor microcomputer 14
  • an outdoor reception photo coupler 16 connected to a reception port of the outdoor microcomputer 14
  • a termination resistor 17 as first resistor means connected in
  • each indoor machine 2 has an indoor control DC power source 21 as indoor control power source means connected between a pair of connection lines 3a and 3b, an indoor microcomputer 22 as indoor control means, an indoor transmission photo coupler 23 connected to a transmission port of the indoor microcomputer 22, an indoor reception photo coupler 24 for the indoor microcomputer 22, and a positive temperature characteristic thermistor 25 for protecting an over-current, as second resistor means having a positive temperature coefficient, connected in series with a collector terminal of a phototransistor 23c of the indoor transmission photo coupler 23.
  • Fig. 13 is a flowchart for explaining an erroneous wiring decision processing of the indoor machine.
  • the transmission port of the indoor microcomputer 22 is turned ON, and a light receiving element 23c of the indoor transmission photo coupler 23 is turned OFF.
  • a decision is made about an interruption in the frequency of the AC power source.
  • the transmission port of the indoor microcomputer 22 is turned OFF, and the light receiving element 23c of the indoor transmission photo coupler 23 is turned ON, and thus, a series of processing is finished.
  • step SP6 when a decision has been made at step SP2 that there is no interruption in the frequency of the AC power source, it is recognized at step SP5 that the connection of the indoor/outdoor connection lines 3 is normal. At step SP6, an operation based on a normal sequence is carried out.
  • Fig. 14 is a flowchart for explaining an erroneous wiring decision processing of the outdoor machine.
  • the transmission port of the outdoor microcomputer 14 is turned OFF, and a light receiving element 15c of the outdoor transmission photo coupler 15 is turned OFF.
  • a decision is made about an interruption in the received data.
  • step SP12 when a decision has been made at step SP12 that there is no interruption in the received data, a wait processing is carried out at step SP13 until an erroneous wiring decision period of the indoor machine 2 has elapsed.
  • step SP14 the transmission port of the outdoor microcomputer 14 is turned ON, and the light receiving element 15c of the outdoor transmission photo coupler 15 is turned ON.
  • step SP15 a decision is made about whether the transmission output and the reception input are equal to each other or not. When the transmission output and the reception input are not equal to each other, a processing at step SP 18 is carried out.
  • step SP15 when a decision has been made at step SP15 that the transmission output and the reception input are equal to each other, it is recognized at step SP16 that the connection of the indoor/outdoor connection lines 3 is normal.
  • step SP17 an operation based on a normal sequence is carried out.
  • a separate type air conditioner has a zero-crossing circuit to detect a frequency of a commercial power source from the power line, and a serial communication circuit to control the operation of the air conditioner by communication by a serial signal between an outdoor machine and an indoor machine.
  • an AC power supply for the zero-crossing circuit and the half-wave-rectified side of the serial communication circuit is taken in from the L-phase opposite to the N-phase (the neutral line) of the AC power source. Therefore, there has been a problem that when a serial communication between the indoor machine and the outdoor machine has been started, the half-wave-rectified DC component current of the AC power source and the half-wave-rectified DC component current of the serial communication flow into the N-phase of the AC power source.
  • the present invention has been made to solve the above problems. It is an object of the present invention to provide a control circuit for an air conditioner, capable of securely protecting a communication line even when the AC power has been supplied to the communication line, and further capable of prompting the installation, decreasing a breaking of a board due to an installation error, decreasing the shipment of free service parts of the board, and improving profit. This object is attained by the constitutions defined in claims 1 to 3.
  • Another object of the present invention is to provide a reliable control circuit of an air conditioner, which can suppress a flow of excessive DC component current into the N-phase of the AC power source. This object is attained by the constitutions defined in claims 4 to 7.
  • FIG. 1 is a control block diagram of the air conditioner of this invention.
  • the air conditioner consists of one outdoor machine 1 and a plurality of indoor machines 2.
  • Each of the plurality of indoor machines 2 has a terminal board 2a comprising a terminal number N, a terminal number 2 and a terminal number 3, and the outdoor machine has an indoor terminal board 1a also comprising terminals No. N, No. 2 and No. 3.
  • the terminal boards of the indoor machines are connected in parallel to the outdoor machine 1 with three indoor/outdoor connection lines 3a, 3b and 3c, respectively.
  • the outdoor machine 1 has an outdoor control DC power source 11 as outdoor control power source means connected between terminals of a commercial power source 10 (hereinafter to be referred to as an AC power source), an outdoor microcomputer 14 as outdoor control means, an outdoor transmission photo coupler 15 consisting of a phototransistor 15c and a photo diode 15b connected to a transmission port of the outdoor microcomputer 14, an outdoor reception photo coupler 16 consisting of a phototransistor 16a connected to a reception port of the outdoor microcomputer 14 and a photo diode 16b, and a series circuit consisting of an outdoor current control resistor 16c and an outdoor diode 16d, connected to the photo diode 16b in series.
  • an outdoor control DC power source 11 as outdoor control power source means connected between terminals of a commercial power source 10 (hereinafter to be referred to as an AC power source)
  • an outdoor microcomputer 14 as outdoor control means
  • an outdoor transmission photo coupler 15 consisting of a phototransistor 15c and a photo diode 15b connected to
  • each indoor machine 2 in which three indoor/outdoor connection lines 3a, 3b, 3c are connected to the terminals No. N, No. 2 and No. 3 of the terminal board 2a, respectively, comprises: an indoor control DC power source 21 as indoor control power source means; an indoor microcomputer 22 as indoor control means; an indoor transmission photo coupler 23 consisting of phototransistor 23c and a photodiode 23b connected to a transmission port of the indoor microcomputer 22 via an indoor transmission transistor 23a; an indoor reception photo coupler 24 consisting of a photodiode 24b and a phototransistor 24a connected to the indoor microcomputer 22; a series circuit of an indoor half-wave rectification diode 23d and an indoor current limiting resistor 23e connected in series to a collector terminal of the phototransistor 23c of the indoor transmission photo coupler 23; a series circuit of a PTC thermistor 24d and a first indoor diode 24c connected in series to the photodiode 24b of the indoor reception photo coupler 24
  • a connection of the communication line in the first embodiment will be explained.
  • the outdoor terminal board 1a of the outdoor machine 1 and the indoor terminal board 2a of the indoor machine 2 have been correctly connected with the indoor/outdoor connection lines 3a, 3b, 3c in installation work and the AC power source 10 is subsequently supplied to the outdoor machine 1
  • the AC power source 10 is outputted from the terminal No. N and the terminal No. 2 of the outdoor terminal board 1a.
  • the AC power source 10 is transmitted through the indoor/outdoor connection lines 3a, 3b and is supplied to the terminal No. N and the terminal No. 2 of the indoor terminal board 2a, and thus the AC power source 10 is supplied to the indoor machine 2.
  • the outdoor control power source 11 of the outdoor machine 1 Based on the supplied AC power source 10, the outdoor control power source 11 of the outdoor machine 1 generates a control power, so that the outdoor microcomputer 14 operates. Similarly, based on the supplied AC power source 10, the indoor control power source 21 of the indoor machine 2 generates a control power, so that the indoor microcomputer 22 operates.
  • the microcomputer 22 satisfies a serial communication starting condition which shows a normal operation of the indoor machine 2, and also three or more minutes has elapsed since the start of the supply of the AC power source 10, a signal to turn ON/OFF the indoor transmission transistor 23a is transmitted to the indoor transmission transistor 23a from the serial signal transmission port of the indoor microcomputer 22. Upon receiving the transmitted ON/OFF signal, the indoor transmission transistor 23a is ON/OFF operated.
  • the photodiode 23b of the indoor transmission photo coupler 23 is turned ON/OFF.
  • the phototransistor of the indoor transmission photo coupler 23 is turned ON/OFF.
  • an indoor half-wave rectifier diode 23d of the indoor machine 2 rectifies the power supplied from the AC power source 10 into half-wave form.
  • the half-wave-rectified AC power source 10 passes through the indoor current limiting resistor 23e which is a resistor for limiting a current to a level not to destroy the indoor transmission photo coupler 23 and the indoor reception photo coupler 24, and becomes a non-insulated DC power source at the indoor Zener diode 28.
  • the voltage and current of the DC power source are turned into a serial signal for communication between indoor and outdoor machines based on the ON/OFF of the indoor transmission photo coupler 23.
  • the serial signal is transmitted from the indoor transmission photo coupler 23 to the indoor reception photo coupler 24. After the indoor reception photo coupler 24 has received the serial signal, the indoor reception photo coupler 24 transmits this signal to the first indoor diode 24c.
  • the first indoor diode 24c After the first indoor diode 24c has received the serial signal, the first indoor diode 24c transmits this signal to the PTC thermistor 24d. After the PTC thermistor 24d has received the serial signal, the PTC thermistor 24d transmits this signal to the terminal number 3 of the indoor terminal board 2a.
  • the indoor terminal board 2a transmits the received serial signal to an indoor/outdoor connection line 3c that connects the terminal No. 3 of the indoor terminal board 2a to the terminal No. 3 of the outdoor terminal board 1a of the outdoor machine 1.
  • the serial signal is transmitted through the indoor/outdoor connection line 3c, so that the serial signal is received by the terminal number 3 of the outdoor terminal board 1a of the outdoor machine 1.
  • the received serial signal is transmitted from the terminal No. 3 of the outdoor terminal board 1a to the outdoor diode 16d.
  • the outdoor diode 16d receives the serial signal and transmits it to the outdoor current limiting resistor 16c.
  • the outdoor current limiting resistor 16c transmits the serial signal to the outdoor reception photo coupler 16.
  • the outdoor reception photo coupler 16 transmits the serial signal to the outdoor transmission photo coupler 15 on the one hand.
  • the phototransistor 16a of the outdoor reception photo coupler 16 is turned ON/OFF on the other hand, and the ON/OFF signal is subsequently inputted to the reception port of the outdoor microcomputer 14.
  • the outdoor microcomputer 14 analyzes the inputted serial signal and replaces this signal with a control signal for operating the outdoor machine 1. Based on a result of this operation, an ON/OFF signal is transmitted, as the serial signal from the outdoor machine 1, from the transmission port of the outdoor microcomputer 14 to the outdoor transmission transistor 15a.
  • the outdoor transmission transistor 15a that has received the serial signal transmits the serial signal to the outdoor transmission photo coupler 15.
  • the photodiode 15b of the outdoor transmission photo coupler 15 is turned ON/OFF and the phototransistor 15c of the outdoor transmission photo coupler 15 is turned ON/OFF.
  • the ON/OFF signal of the phototransistor 15 can be superposed on the serial signal received from the outdoor reception photo coupler 16 in the outdoor transmission photo couple 15 connected to the N-phase of the AC power source 10.
  • the superposed serial signal is transmitted from the outdoor transmission photo coupler 15 to the terminal No. N of the outdoor terminal board 1a.
  • the N of the outdoor terminal board 1a receives the serial signal, and transmits this signal to the indoor/outdoor connection line 3a that connects the terminal No. N of the outdoor terminal board 1a to the terminal No. N of the indoor terminal board 2a of the indoor machine 2.
  • the serial signal is transmitted through the indoor/outdoor connection line 3a.
  • the terminal No. N of the indoor terminal board 2a receives the serial signal and transmits it to the minus side of the DC power source at the indoor Zener diode 28.
  • the minus (-) side of the indoor Zener voltage stabilizing electrolytic capacitor 26 acting as a reference ground of the serial communication circuit is turned ON/OFF based on the ON/OFF of the serial signal from the outdoor machine 1, so that the phototransistor of the indoor transmission photo coupler 23 is turned ON/OFF at the outdoor transmission photo coupler 15.
  • the indoor transmission photo coupler 23 receives the serial signal and subsequently transmits it to the indoor reception photo coupler 24, so that the indoor reception photo coupler 24 receives this serial signal.
  • the photodiode 24b of the indoor reception photo coupler 24 is turned ON/OFF based on the received serial signal, the phototransistor 24a of the indoor reception photo coupler 24 is turned ON/OFF.
  • the reception port of the indoor microcomputer 22 becomes Hi/Lo, so that the indoor microcomputer 22 receives and analyzes the serial signal from tthe outdoor machine, and transmits a new serial signal from the transmission port of the indoor microcomputer 22. Based on the above-described flow of the serial signals, the serial communication between the outdoor machine 1 and the indoor machine 2 is established.
  • the outdoor terminal board 1a of the outdoor machine 1 and the indoor terminal board 2a of the indoor machine 2 have been erroneously connected in installation as shown by indoor/outdoor connection lines 31 in Fig. 2.
  • the AC power source 10 is supplied to the outdoor control power source 11 of the outdoor machine 1.
  • the outdoor control power source 11 generates a control power supply, and the outdoor machine 1 becomes in a state of waiting for a serial signal from the indoor machine 2.
  • the AC power source 10 is not correctly supplied to the indoor machine 2, since the indoor/outdoor connection lines 31 are connected so as to connect the terminal No. N of the outdoor terminal board 1a of the outdoor machine 1 to the terminal No. N of the indoor terminal board 2a of the indoor machine 2, the terminal No. 2 of the outdoor terminal board 1a to the terminal No.
  • the AC power source 10 is not being supplied between the terminal No. N and the terminal No. 2 of the indoor terminal board 2a of the indoor machine 2, so that the indoor control power source 21 of the indoor machine 2 cannot operate and the indoor machine 2 does not operate (as the indoor microcomputer 22 cannot operate, the indoor machine 2 does not operate even when a trial operation switch has been depressed).
  • the AC power source 10 is supplied between the terminal No. N and the terminal No. 3 of the indoor terminal board 2a of the indoor machine 2. The AC power source 10 supplied from the terminal No.
  • the PTC thermistor 24d is connected to cathodes of the second indoor diode 27 and the first indoor diode 24c, no current flows to the second indoor diode 27 and the first indoor diode 24c, so that the serial communication circuit of the indoor machine 2 is protected.
  • the AC power source 10 supplied from the terminal No. N of the indoor terminal board 2a is supplied to the second indoor diode 27 of the indoor machine 2.
  • the power source is then supplied to the PTC thermistor 24d, the terminal No. 3 of the indoor terminal board 2a, and then the terminal No. 2 of the outdoor terminal board 1a of the outdoor machine 1 through an indoor/outdoor connection line 31. Then, the power returns to the AC power source 10.
  • the outdoor terminal board 1a of the outdoor machine 1 and the indoor terminal board 2a of the indoor machine 2 have been erroneously connected in installation as shown by an indoor/outdoor connection lines 32 in Fig. 2.
  • the AC power source 10 is supplied to the outdoor control power source 11 of the outdoor machine 1.
  • the outdoor control power source 11 generates a control power supply, and the outdoor machine 1 becomes in a state of waiting for a serial signal from the indoor machine 2.
  • the AC power source 10 is not correctly supplied to the inner machine 2, since the indoor/outdoor connection lines 32 in the case 2 are connected so as to connect the terminal No. N of the outdoor terminal board 1a of the outdoor machine 1 to the terminal No. 3 of the indoor terminal board 2a of the indoor machine 2, the terminal No. 2 of the outdoor terminal board 1a to the terminal No. N of the indoor terminal board 2a, and the terminal No. 3 of the outdoor terminal board 1a to the terminal No. 2 of the indoor terminal board 2a, respectively.
  • the AC power source 10 is not being supplied between the terminal No. N and the terminal No. 2 of the indoor terminal board 2a of the indoor machine 2, so that the indoor control power source 21 of the indoor machine 2 cannot operate and the indoor machine 2 does not operate. In other words, as the indoor microcomputer 22 cannot operate, the indoor machine 2 does not operate even when a trial operation switch has been depressed.
  • the AC power source 10 is supplied between the terminal No. N and the terminal No. 3 of the indoor terminal board 2a of the indoor machine 2.
  • the AC power source 10 supplied from the terminal No. 3 of the indoor terminal board 2a is supplied to the PTC thermistor 24d.
  • the PTC thermistor 24d is connected to the cathodes of the second indoor diode 27 and the first indoor diode 24c, no current flows to the second indoor diode 27 and the first indoor diode 24c, so that the serial communication circuit of the indoor machine 2 is protected.
  • the AC power source 10 supplied from the terminal No. N of the indoor terminal board 2a is supplied to the second indoor diode 27 of the indoor machine 2.
  • the power source is then supplied to the PTC thermistor 24d, the terminal No. 3 of the indoor terminal board 2a, and then the terminal No. N of the outdoor terminal board 1a of the outdoor machine 1 through an indoor/outdoor connection line 32. Then, the power returns to the AC power source 10.
  • the outdoor terminal board 1a of the outdoor machine 1 and the indoor terminal board 2a of the indoor machine 2 have been erroneously connected in installation as shown by indoor/outdoor connection lines 33 in Fig. 3.
  • the AC power source 10 is supplied to the outdoor control power source 11 of the outdoor machine 1.
  • the outdoor control power source 11 generates a control power supply, and the outdoor machine 1 becomes in a state of waiting for a serial signal from the indoor machine 2.
  • the AC power source 10 is not correctly supplied to the indoor machine 2, since the indoor/outdoor connection lines 33 are connected so as to connect the terminal No. N of the outdoor terminal board 1a of the outdoor machine 1 to the terminal No. 2 of the indoor terminal board 2a of the indoor machine 2, the terminal No. 2 of the outdoor terminal board 1a to the terminal No. 3 of the indoor terminal board 2a, and the terminal No. 3 of the outdoor terminal board 1a to the terminal No. N of the indoor terminal board 2a, respectively.
  • the AC power source 10 is not being supplied between the terminal No. N and the terminal No. 2 of the indoor terminal board 2a of the indoor machine 2, so that the indoor control power source 21 of the indoor machine 2 cannot operate and the indoor machine 2 does not operate. In other words, as the indoor microcomputer 22 cannot operate, the indoor machine 2 does not operate even when a trial operation switch has been depressed.
  • the AC power source 10 is supplied between the terminal No. 2 and the terminal No. 3 of the indoor terminal board 2a of the indoor machine 2.
  • the AC power source 10 supplied from the terminal No. 3 of the indoor terminal board 2a is supplied to the PTC thermistor 24d.
  • the PTC thermistor 24d is connected to cathodes of the second indoor diode 27 and the first indoor diode 24c.
  • the AC power source 10 supplied from the terminal No. 2 of the indoor terminal board 2a is supplied to the indoor half-wave rectifier diode 23d of the indoor machine 2, and then to the indoor current limiting resistor 23e.
  • the indoor current limiting resistor 23e limits the current to such a level that the indoor transmission photo coupler 23 and the indoor reception photo coupler 24 are not broken. Therefore, even if the AC power source 10 is erroneously supplied between the terminal No. 2 and the terminal No. 3 of the indoor terminal board 2a of the indoor machine 2, the serial communication circuit of the indoor machine 2 is protected.
  • the outdoor terminal board 1a of the outdoor machine 1 and the indoor terminal board 2a of the indoor machine 2 have been erroneously connected in installation as shown by indoor/outdoor connection lines 34 in Fig. 3.
  • the AC power source 10 When the AC power source 10 has been supplied to the outdoor machine 1, the AC power source 10 is supplied to the outdoor control power source 11 of the outdoor machine 1.
  • the outdoor control power source 11 generates a control power supply, and the outdoor machine 1 becomes in a state of waiting for a serial signal from the indoor machine 2.
  • the AC power source 10 is not correctly supplied to the indoor machine 2, since the indoor/outdoor connection lines 34 are connected so as to connect the terminal No. N of the outdoor terminal board 1a of the outdoor machine 1 to the terminal No. 3 of the indoor terminal board 2a of the indoor machine 2, the terminal No. 2 of the outdoor terminal board 1a to the terminal No. 2 of the indoor terminal board 2a, and the terminal No. 3 of the outdoor terminal board 1a to the terminal No. N of the indoor terminal board 2a.
  • the AC power source 10 is not being supplied between the terminal No. N and the terminal No. 2 of the indoor terminal board 2a of the indoor machine 2, so that the indoor control power source 21 of the indoor machine 2 cannot operate and the indoor machine 2 does not operate. In other words, as the indoor microcomputer 22 cannot operate, the indoor machine 2 does not operate even when a trial operation switch has been depressed.
  • the AC power source 10 is supplied between the terminal No. 2 and the terminal No. 3 of the indoor terminal board 2a of the indoor machine 2.
  • the AC power source 10 supplied from the terminal No. 3 of the indoor terminal board 2a is supplied to the PTC thermistor 24d.
  • the AC power source 10 supplied from the terminal No. 2 of the indoor terminal board 2a is supplied to the indoor half-wave rectifier diode 23d of the indoor machine 2, and then to the indoor current limiting resistor 23e.
  • the indoor current limiting resistor 23e limits the current to such a level that the indoor transmission photo coupler 23 and the indoor reception photo coupler 24 are not broken. Therefore, even if the AC power source 10 is erroneously supplied between the terminal No. 2 and the terminal No. 3 of the indoor terminal board 2a of the indoor machine 2, the serial communication circuit of the indoor machine 2 is protected.
  • the outdoor terminal board 1a of the outdoor machine 1 and the indoor terminal board 2a of the indoor machine 2 have been erroneously connected as shown by indoor/outdoor connection lines 35 in Fig. 4.
  • the AC power source 10 When the AC power source 10 is supplied to the outdoor machine 1, the AC power source 10 is outputted from the terminal No. N and the terminal No. 2 of the outdoor terminal board 1a.
  • the AC power source 10 is transmitted through the indoor/outdoor connection lines 35 and is supplied to the terminal No. 2 and the terminal No. N of the indoor terminal board 2a, and thus the AC power source 10 is supplied to the indoor machine 2.
  • the outdoor control power source 11 of the outdoor machine 1 Based on the supplied AC power source 10, the outdoor control power source 11 of the outdoor machine 1 generates a control power, so that the outdoor microcomputer 14 operates.
  • the indoor control power source 21 of the indoor machine 2 Based on the supplied AC power source 10, the indoor control power source 21 of the indoor machine 2 generates a control power, so that the indoor microcomputer 22 operates.
  • a signal to turn ON/OFF the indoor transmission transistor 23a is transmitted to the indoor transmission transistor 23a from the serial signal transmission port of the indoor microcomputer 22.
  • the indoor transmission transistor 23a is ON/OFF operated.
  • the photodiode 23b of the indoor transmission photo coupler 23 is turned ON/OFF.
  • the phototransistor 23c of the indoor transmission photo coupler 23 is turned ON/OFF.
  • the indoor half-wave rectifier diode 23d of the indoor machine 2 rectifies the power supplied from the AC power source 10 into half-wave form.
  • the half-wave-rectified AC power source 10 passes through the indoor current limiting resistor 23e which is a resistor for limiting a current to a level not to destroy the indoor transmission photo coupler 23 and the indoor reception photo coupler 24, and makes a non-insulated DC power source at the indoor Zener diode 28.
  • the voltage and current of the DC power source are turned into a serial signal for communication between indoor and outdoor machines based on the ON/OFF of the indoor transmission photo coupler 23.
  • the serial signal is transmitted from the indoor transmission photo coupler 23 to the indoor reception photo coupler 24. After the indoor reception photo coupler 24 has received the serial signal, the indoor reception photo coupler 24 transmits this signal to the first indoor diode 24c. After the first indoor diode 24c has received the serial signal, the first indoor diode 24c transmits this signal to the PTC thermistor 24d. After the PTC thermistor 24d has received the serial signal, the PTC thermistor 24d transmits this signal to the terminal No. 3 of the indoor terminal board 2a. The indoor terminal board 2a transmits the received serial signal to an indoor/outdoor connection line 35 that connected the terminal NO. 3 of the indoor terminal board 2a to the terminal No. 3 of the first outdoor terminal board 1a of the outdoor machine 1.
  • the serial signal is transmitted through the indoor/outdoor connection line 35, so that the serial signal is received by the terminal No. 3 of the outdoor terminal board 1a of the outdoor machine 1.
  • the received serial signal is transmitted from the terminal No. 3 of the outdoor terminal board 1a to the outdoor diode 16d.
  • the outdoor diode 16d receives the serial signal and transmits it to the outdoor current limiting resistor 16c.
  • the outdoor current limiting resistor 16c When the outdoor current limiting resistor 16c has received the serial signal, the outdoor current limiting resistor 16c transmits the serial signal to the outdoor reception photo coupler 16.
  • the outdoor reception photo coupler 16 When the outdoor reception photo coupler 16 has received the serial signal, the outdoor reception photo coupler 16 transmits the serial signal to the outdoor transmission photo coupler 15 on the one hand. That is, when the photodiode 16b of the outdoor reception photo coupler 16 has been turned ON/OFF, the phototransistor 16a of the outdoor reception photo coupler 16 is turned ON/OFF on the other hand, and the ON/OFF signal is subsequently inputted to the reception port of the outdoor microcomputer 14.
  • the outdoor microcomputer 14 analyzes the inputted serial signal and replaces this signal with a control signal for operating the outdoor machine 1.
  • an ON/OFF signal is transmitted as the serial signal from the outdoor machine 1 from the transmission port of the outdoor microcomputer 14 to the outdoor transmission transistor 15a.
  • the outdoor transmission transistor 15a that has received the serial signal transmits the serial signal to the outdoor transmission photo coupler 15.
  • the photodiode 15b of the outdoor transmission photo coupler 15 is turned ON/OFF, and the phototransistor 15c of the outdoor transmission photo coupler 15 is turned ON/OFF.
  • the ON/OFF signal of the phototransistor 15c can be superposed on the serial signal received from the outdoor reception photo coupler 16, in the outdoor transmission photo coupler 15 connected to the N-phase of the AC power source 10 .
  • the superposed serial signal is transmitted from the outdoor transmission photo coupler 15 to the terminal No. N of the outdoor terminal board 1a.
  • the terminal No. N of the outdoor terminal board 1a receives the serial signal, and transmits this signal to the indoor/outdoor connection line 35 that connects the terminal No. N of the outdoor terminal board 1a and the terminal No. 2 of the indoor terminal board 2a of the indoor machine 2.
  • the serial signal is transmitted through the indoor/outdoor connection line 35.
  • Fig. 5 is a flowchart showing the operation of the air conditioner of this invention. The flowchart will be explained.
  • step SP1 the indoor machine and the outdoor machine are connected in installation.
  • step SP2 the AC power source is supplied to the outdoor machine.
  • step SP3 the trial operation switch of the indoor machine is depressed.
  • step SP4 it is confirmed whether the indoor machine operates or not. If the indoor machine operates, at step SP5, lapse of three minutes is waited after the supply of the AC power source has been started at step SP2. Then, at step SP6, if both the outdoor machine and the indoor machine operate normally, the connection in installation is completed. If the outdoor machine and the indoor machine do not operate normally at step SP6, the AC power source is turned OFF at step SP8.
  • step SP9 When the AC power source has been turned OFF, an erroneous wiring connection lines between the indoor machine and the outdoor machine is checked at step SP9. If there is an erroneous wiring, the erroneous wiring between the indoor machine and the outdoor machine is corrected at step SP10. The process then returns to step SP2 again, and the AC power source is turned ON. At step SP9, if the wiring is correct without an erroneous wiring, the process proceeds to step SP11. As the air conditioner does not operate normally because of other factors than the erroneous wiring between the indoor machine and the outdoor machine, other parts such as a board are checked and replaced. The process returns again to step SP2, and the AC power source is turned ON.
  • step SP4 it is checked whether the indoor machine operates or not. If the indoor machine does not operate, an erroneous wiring of the connection lines between the indoor machine and the outdoor machine is recognized at step SP12. At this point of time, although the AC power source is supplied to the serial signal circuit by the erroneous wiring, it is possible to protect the serial circuit of the indoor machine by the PTC thermistor, the indoor current limiting resistor and the indoor diode at step SP13. In other words, in stead of turning OFF the AC power source at step SP14, the AC power source may be turned OFF at the point of time when the erroneous wiring has been found.
  • step SP15 After the AC power source has been turned OFF, the connection between the indoor machine and the outdoor machine is corrected at step SP15. Then, the process returns to step SP2 again, and the AC power source is turned ON. It is confirmed at step SP3 and step SP4 that the indoor machine and the outdoor machine operate normally. The process becomes END at step SP7 after passing through step SP5 and step SP6.
  • the serial circuit is not destroyed so that replacement of the boards caused by the erroneous wiring is not necessary.
  • the shipment rate of free services boards is decreased, the profit rate is increased, and replacement of the boards in installation becomes unnecessary.
  • the installation efficiency is increased. Further, in the case where the serial circuit of the indoor machine shown in Figs.
  • Fig. 6 is a block diagram showing a structure in which the outdoor machine and the indoor machine have been connected normally in a second embodiment.
  • the PCT thermistor 24d in the first embodiment is replaced by a fuse 29 and the other constitution is the same as in Fig. 1.
  • the fuse 29 is blown off when an over-current flows in the communication circuit due to an erroneous wiring.
  • the AC power is similarly converted into a low voltage by an outdoor control power source (404) in the outdoor machine (401), to create an outdoor control power supply for operating an outdoor microcomputer (405).
  • an indoor choke coil (416) removes noise from the AC power source (402) which is a commercial power supply to make the AC power source without noise.
  • the power source is then half-wave rectified by an indoor half-wave rectifier diode (421) which is connected to the N-phase of the neutral line, that is, the terminal No. N of the indoor terminal board (413) of the indoor machine (412).
  • the power source flows to an indoor current limiting resistor (422) which limits it to a current level that does not destroy the photodiode of an indoor zero-crossing photo coupler (423), and is then transmitted to the indoor zero-crossing photo coupler (423).
  • the photodiode of the indoor zero-crossing photo coupler (423) makes its phototransistor ON/OFF operate.
  • this ON/OFF signal is transmitted to a zero-crossing input terminal of the indoor microcomputer (434). Therefore, the indoor microcomputer controls the operation of the indoor machine based on this operation signal.
  • the limited current that has passed through the photodiode of the indoor zero-crossing photo coupler (423) returns to the L-phase on the opposite side of the neutral line of the AC power source (402) (the terminal No. 2 of the indoor terminal board of the indoor machine).
  • the above is the structure and operation of the zero-crossing circuit that detects the frequency of a commercial power supply by half-wave rectification.
  • the indoor microcomputer (434) that has received the serial signal transmits a serial signal from its transmission port to turn ON/OFF an indoor transmission transistor (432), thereby making the serial communication circuit operate.
  • the photodiode of the indoor transmission photo coupler (431) connected to this indoor transmission transistor (432) is turned ON/OFF so that its phototransistor is accordingly turned ON/OFF.
  • the power supplied from the L-phase opposite to the neutral line of the AC power source (402) is half-wave rectified by an indoor communication half-wave rectifier diode (424).
  • an indoor serial current limiting resistor (425) limits the power source to a current level that does not destroy the indoor transmission photo coupler (431) and an indoor reception photo coupler (433).
  • an indoor Zener diode (426) converts the power source into a non-insulated DC power supply.
  • the voltage and current of the converted DC power supply are turned into a serial signal that is a communication signal between indoor and outdoor machines.
  • This serial signal is transmitted to an indoor diode (429) via the indoor reception photo coupler (433), and then the terminal No. 3 of the indoor terminal board (413) connected to the terminal No. 3 of the outdoor terminal board (403) via an PTC thermistor (430).
  • the serial signal transmitted to the terminal No. 3 of this outdoor terminal board (403) is transmitted to an outdoor current limiting resistor (408) via an outdoor diode (407).
  • the serial signal is then limited to a current level that does not destroy the photodiode of an outdoor photo coupler (406), and transmitted to an outdoor transmission photo coupler (410) via the photodiode of the outdoor reception photo coupler (406).
  • the photodiode of the outdoor reception photo coupler (406) is turned ON/OFF and its phototransistor is consequently turned ON/OFF.
  • the outdoor microcomputer (405) analyzes the received serial signal, generates a control signal based on a result of this analysis, controls the operation of the outdoor machine (401), and transmits contents of the control as a serial signal (an ON/OFF signal) from the transmission port to the outdoor transmission photo coupler (410) via an outdoor transmission transistor (409).
  • the photodiode of the outdoor transmission photo coupler (410) is turned ON/OFF, and at the same time, its phototransistor is also turned ON/OFF.
  • the ON/OFF signal transmitted from the outdoor transmission transistor (409) to the outdoor transmission photo coupler (410) is superposed on the serial signal received from the outdoor reception photo coupler (406) in the outdoor transmission photo coupler (410) connected to the N-phase.
  • the superposed serial signal is transmitted from the outdoor transmission photo coupler (410) to the terminal No. N of the outdoor terminal board (403), the terminal No. N of the indoor terminal board (413) connected to the terminal No. N of the outdoor terminal board (403), and then the minus side of the DC power source at the indoor Zener diode (426) connected to the terminal No. N of the indoor terminal board (413).
  • a reference ground of the serial communication circuit which is the minus side of an indoor Zener voltage stabilization electrolytic capacitor (427) is also turned ON/OFF according to the ON/OFF serial signal from the outdoor transmission photo coupler (410). Consequently, the phototransistor of the indoor transmission photo coupler (431) is turned ON/OFF, and the photodiode connected to the phototransistor is also turned ON/OFF.
  • the reception port of the indoor microcomputer (434) turns Hi/Lo, and the indoor microcomputer (434) analyzes the serial signal from the outdoor machine and transmits a new serial signal from the transmission port of the indoor microcomputer (434).
  • the power supply for the serial communication circuit between the indoor machine and the outdoor machine is taken in from the L-phase opposite to the N-phase of the AC power source, and the power supply for the zero-crossing circuit to detect the frequency of the AC power source is taken in through a half-wave rectifier diode from the N-phase which is a neutral line of the AC power source. Therefore, the respective DC component currents are not added together, and these currents flow to respective phases of the AC power source, so that a highly reliable control circuit for a separate type air conditioner that prevents an occurrence of a malfunction of each machine caused by higher harmonics can be obtained as a result.
  • an indoor choke coil (516) removes noise from the AC power source (502) of a commercial power supply.
  • the power source is rectified in half wave form by an indoor half-wave rectifier diode (521) connected to the N-phase of the neutral line, that is, the terminal No. N of the indoor terminal board (513) of the indoor machine (512).
  • the rectified power supply is transmitted to an indoor current limiting resistor (522) to limit it to a current level that does not destroy an photodiode of an indoor zero-crossing photo coupler (523), and then transmitted to the indoor zero-crossing photo coupler (523).
  • the photodiode of the indoor zero-crossing photo coupler (523) makes its phototransistor ON/OFF.
  • this signal is inputted to a zero-crossing input port of the indoor microcomputer (534) so that the indoor microcomputer controls the operation of the indoor machine based on this signal.
  • the current that has passed through the photo diode of the indoor zero-crossing photo coupler (523) returns to the L-phase opposite to the neutral line of the AC power source (502), that is, the terminal No. L of the indoor terminal board (513) of the indoor machine (512).
  • the above is the structure and operation of the zero-crossing circuit to detect the frequency of the AC power supply by half-wave rectification.
  • a signal for turning ON/OFF an indoor transmission transistor (532) is transmitted from the serial signal transmission port of the indoor microcomputer (534).
  • the photodiode of the indoor transmission photo coupler (531) connected to this indoor transmission transistor (532) is turned ON/OFF so that the phototransistor of the indoor transmission photo coupler (531) is subsequently turned ON/OFF.
  • the indoor microcomputer (534) judges that the serial communication starting condition has been satisfied, in other words, the indoor machine 512 normally operates after the lapse of three or more minutes since the starting of the supply of the AC power source (502), the indoor microcomputer (534) transmits an ON signal to a 52C relay driving transistor (536) thereby to turn ON the 52C relay. Therefore, the L-phase opposite to the neutral line of the AC power source (502) is connected to a terminal No. 2 of the outdoor terminal board (503) of the outdoor machine (501) of the air conditioner via the terminal No. 2 of the indoor terminal board (513) of the indoor machine (512) and an indoor/outdoor connection line (511). Thus, the AC power source (502) is supplied to the outdoor machine (501) of the air conditioner.
  • the AC power source (502) supplied to the outdoor machine (501) is supplied to the outdoor control power source (504), so that the outdoor microcomputer (505) operates to operate the outdoor machine.
  • the AC power source (502) is also supplied to the serial communication circuit of the indoor machine (512).
  • the indoor transmission transistor (532) and the subsequent phototransistor of the indoor transmission photo coupler (531) are turned ON/OFF according to the serial signal of the indoor microcomputer (534). Therefore, the following operation is added.
  • the power source supplied from the terminal No. L of the indoor terminal board (513) of the indoor machine (512) is half-wave rectified by the indoor communication half-wave rectifier diode (524), and then limited by an indoor serial current limiting resistor (525) to a current level that does not destroy the indoor transmission photo coupler (531) and the indoor reception photo coupler (533). Then, an indoor Zener diode (526) converts the power source into a non-insulated DC power supply. Based on the ON/OFF of the indoor transmission photo coupler (531), the power supply is turned into a serial communication signal between the indoor and outdoor machines. The serial communication signal is transmitted to an indoor communication diode (529) via the indoor reception photo coupler (533), and then to a terminal No. 3 of the indoor terminal board (513) via an indoor serial current limiting resistor 2 (530).
  • the serial signal is transmitted to the terminal No. 3 of the outdoor terminal board (503) of the outdoor machine (501) connected to the indoor terminal board (513), and then to an outdoor current limiting resistor (508) via an outdoor diode (507). Thereafter, the serial signal is further transmitted to an outdoor transmission photo coupler (510) via an outdoor reception photo coupler (506).
  • the photodiode of the outdoor reception photo coupler (506) is turned ON/OFF, and at the same time, its phototransistor is also turned ON/OFF.
  • the ON/OFF signal is inputted to the reception port of the outdoor microcomputer (505) according to the ON/OFF of the phototransistor.
  • the outdoor microcomputer (505) analyzes the inputted result and substitutes a control signal to operate the outdoor machine (501). Therefore, the ON/OFF signal is transmitted as a serial signal from the outdoor microcomputer (505) to the outdoor transmission transistor (509), and the photodiode of the outdoor transmission photo coupler (510) is turned ON/OFF so that its phototransistor is also turned ON/OFF.
  • the ON/OFF signal transmitted from the outdoor transmission transistor to the outdoor transmission photo coupler (510) is superposed on the serial signal received from the outdoor reception photo coupler (506), in the outdoor transmission photo coupler (510) connected to the N-shape of the AC power source.
  • the superposed serial signal is transmitted from the outdoor transmission photo coupler (510) to the terminal No. N of the outdoor terminal board (503), received by the terminal No. N of the indoor terminal board (513), and then transmitted to the minus side of the DC power source at indoor Zener diode (526). Therefore, a reference ground of the serial communication circuit which is the minus side of an indoor Zener voltage stabilizing electrolytic capacitor (527) is turned ON/OFF based on the serial signal from the outdoor transmission photo coupler (510). As a result, the phototransistor of the indoor transmission photo coupler (533) is also turned ON/OFF, and the photodiode connected to the phototransistor is also turned ON/OFF.
  • the reception port of the indoor microcomputer (534) turns Hi/Lo, so that the indoor microcomputer (534) receives and analyzes the serial signal from the outdoor machine to transmit a new serial signal from its transmission port.
  • the power supply for the serial communication circuit between the indoor machine and the outdoor machine is taken in from the L-phase opposite to the N-phase of the AC power source. Then, the power supply for the zero-crossing circuit to detect the frequency of the AC power supply is taken in through a half-wave rectifier diode, from the N-phase of the neutral line of the AC power source. Therefore, after confirming the operation state of the indoor machine, the respective DC component currents are not added together, and these currents flow to respective phases of the AC power source, so that a highly reliable control circuit for a separate type air conditioner that prevents an occurrence of a malfunction of each machine caused by a higher harmonics can be obtained as a result.
  • Fig. 9 is a control circuit of a case where an AC power source is provided separately for the outdoor machine (601) and the indoor machine (612). Based on this arrangement, a power supply wiring for supplying the AC power source from the outdoor machine (601) to each indoor machine (612) is not necessary.
  • an outdoor terminal board (803) of an outdoor machine (801) and an indoor terminal board (813) of an indoor machine (812) of an air conditioner have been connected with an indoor/outdoor connection lines (811), and an AC power source (802) is supplied to the outdoor machine (801), the AC power source (802) outputted from a terminal No. N and a terminal No. 2 of the outdoor terminal board (803) is transmitted through the indoor/outdoor connection line (811) and is supplied to a terminal No. N and a terminal No. 2 of the indoor terminal board (813).
  • an outdoor control power source (804) generates control power supply to operate an outdoor microcomputer (805).
  • an indoor control power source (820) generates control power supply to operate an indoor microcomputer (834).
  • an indoor choke coil (816) removes noise from the AC power source (802) as a commercial power supply to make an AC power source without noise.
  • the power source is then rectified in half-wave form by an indoor half-wave rectifier diode (821) connected to the L-phase opposite to the neutral line, that is, the terminal No. 2 of the indoor terminal board (813) of the indoor machine (812), and then transmitted to an indoor zero-crossing photo coupler (823).
  • the phototransistor of the indoor zero-crossing photo coupler (823) ON/OFF operates.
  • This ON/OFF operation signal is inputted to the zero-crossing input port of the indoor microcomputer (834), so that the indoor microcomputer controls the operation of the indoor machine based on this signal.
  • the current that has passed through the photodiode of the indoor zero-crossing photo coupler (823) returns to the N-phase of the neutral line of the AC power source (802), that is, the terminal No. N of the indoor terminal board (813) of the indoor machine (812).
  • the above is the structure and operation of the zero-crossing circuit.
  • the indoor microcomputer (834) that has received the serial signal by the above operation of the zero-crossing circuit starts a serial communication.
  • the indoor microcomputer (834) transmits a serial signal from its transmission port to an indoor transmission transistor (832), to operate the transistor (832).
  • the photodiode of an indoor transmission photo coupler (831) connected to this indoor transmission transistor (832) is turned ON/OFF, and its phototransistor is consequently turned ON/OFF.
  • the power supplied from the N-phase of the neutral line of the AC power source (802) is half-wave rectified by an indoor communication half-wave rectifier diode (824), and limited by an indoor serial current limiting resistor (825) to a current level that does not destroy the indoor transmission photo coupler (831) and an indoor reception photo coupler (833).
  • an indoor Zener diode (826) converts the power source into a non-insulated DC power supply.
  • the voltage and current of the converted DC power supply is turned into a serial signal which is a communication signal between the indoor and outdoor machines.
  • This serial signal is transmitted to an indoor communication diode (829) via the indoor reception photo coupler (833), and thereafter, to a terminal No. 3 of the indoor terminal board (813) connected to a terminal No. 3 of the outdoor terminal board (803), via an PTC thermistor (830).
  • the serial signal transmitted from the indoor terminal board (813) to the terminal No. 3 of the outdoor terminal board (803) is further transmitted to an outdoor current limiting resistor (808) via an outdoor diode (807).
  • the current of the serial signal is then limited, and the serial signal is then transmitted to an outdoor transmission photo coupler (810) via the outdoor reception photo coupler (806).
  • the photodiode and phototransistor of the outdoor communication reception photo coupler (806) are turned ON/OFF so that the ON/OFF signal is inputted to the reception port of the outdoor microcomputer (805).
  • the outdoor microcomputer (805) analyzes this signal, generates a control signal based on a result of this analysis so as to control the operation of the outdoor machine (801).
  • the control contents are transmitted as a serial signal from its transmission port to the outdoor transmission photo coupler (810) via an outdoor transmission transistor (809).
  • the serial signal from the outdoor transmission transistor (809) and the serial signal received from the outdoor reception photo coupler (806) are combined and superposed together by the outdoor transmission photo coupler (810) connected to the L-phase.
  • the superposed serial signal is transmitted from the outdoor transmission photo coupler (810) to the terminal No. 2 of the outdoor terminal board (803), and then to the terminal No. 2 of the indoor terminal board (813) via an indoor/outdoor connection line (811). Therefore, the serial signal is transmitted to the minus side of the DC power source at the indoor Zener diode (826) connected to the terminal No. 2 of the indoor terminal board (813).
  • a reference ground of the serial communication circuit which is the minus side of an indoor Zener voltage stabilization electrolytic capacitor (827) is also turned ON/OFF by the ON/OFF serial signal from the outdoor machine (801). Therefore, the phototransistor of the indoor transmission photo coupler (833) is turned ON/OFF, and photodiode connected to the phototransistor is also turned ON/OFF.
  • the reception port of the indoor microcomputer (834) is turned Hi/Lo, so that the indoor microcomputer (834) receives and analyzes the serial signal from the outdoor machine.
  • a new serial signal is transmitted from the transmission port of the indoor microcomputer (834).
  • the power supply for the zero-crossing circuit is taken in from the L-phase opposite to the N-phase of the AC power source, and the power supply for the serial communication circuit is taken in from the N-phase of the neutral line of the AC power source. Therefore, the respective DC component currents are not added together, and these currents flow to respective phases of the AC power source so that a highly reliable control circuit for a separate type air conditioner that prevents an occurrence of a malfunction of each machine caused by higher harmonics can be obtained as a result.
  • the fifth embodiment is constituted such that, in relation to the shifting from the zero-crossing circuit operation to the serial communication circuit operation in the third or fourth embodiment, it is judged whether or not the indoor machine has been normally operated in the zero-crossing circuit operation for a predetermined time period. If the indoor machine is normally operated, the operation shifts from the zero-crossing circuit to the serial communication circuit.
  • the indoor machine and the outdoor machine of the air conditioner are installed and wired (701).
  • the AC power source has been turned on (702)
  • a trial operation switch of the indoor machine is depressed or the operation is remote controlled, that is, an ON signal is transmitted (703).
  • an indoor microcomputer judges whether the operation state of the indoor machine is normal or abnormal (705).
  • the indoor microcomputer issues instructions for displaying the abnormal state, stopping in the abnormal state (actuator), and starting count of a restarting time (three minutes, for example) (710), so that the display of abnormality, the abnormal stopping (actuator), and the time counting (710) are carried out. After three minutes (711), the process returns to step (705).
  • the indoor microcomputer judges again whether the operation state of the indoor machine is normal or abnormal. When a result is NO, the same operation is repeated.
  • the indoor microcomputer instructs the indoor serial communication circuit to start transmitting a serial signal (706) so that the indoor serial communication circuit transmits the serial signal to the indoor machine and the outdoor machine respectively via an indoor/outdoor connection line.
  • an outdoor microcomputer judges whether the operation state of the outdoor machine is normal or abnormal after receiving this serial signal (707).
  • the outdoor microcomputer transmits a serial abnormal signal representing this abnormal state to outdoor serial communication circuit.
  • the outdoor serial communication circuit transmits the serial abnormal signal to the indoor microcomputer via the indoor serial communication circuit (709).
  • the indoor microcomputer having received the serial abnormal signal (709) issues an instruction for displaying the abnormal state, stopping in the abnormal state (actuator), and starting count for three-minutes (710). After three minutes (711), the process returns to step (705).
  • the indoor microcomputer judges whether the operation state of the indoor machine is normal or abnormal. When a result is NO, a similar operation is repeated.
  • the outdoor microcomputer transmits its contents to the indoor microcomputer via the indoor/outdoor connection line, and indoor microcomputer having received the contents transmits a serial signal representing the latest operation state information of the indoor machine to the outdoor machine. Therefore, the both machines can continue to operate confirming the operation state of each other.
  • the serial communication is started after a predetermined time since a remote control or the like issues the instruction of operation ON. Therefore, at the starting time for the first three minutes, the DC current component is generated in only the zero-crossing circuit.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)
EP01109518A 2000-05-23 2001-04-17 Steuerschaltung für eine Klimaanlage Expired - Lifetime EP1158253B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2000151377 2000-05-23
JP2000151377A JP3598945B2 (ja) 2000-05-23 2000-05-23 空気調和機の通信回路保護装置
JP2000178435A JP4288831B2 (ja) 2000-06-14 2000-06-14 セパレート形空気調和機の制御回路
JP2000178435 2000-06-14

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EP1158253A2 true EP1158253A2 (de) 2001-11-28
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WO2006057221A1 (ja) 2004-11-29 2006-06-01 Daikin Industries, Ltd. 空気調和機
EP2042819A3 (de) * 2007-09-26 2013-01-02 Sanyo Electric Co., Ltd. Klimaanlagensystem mit Kontrolle der elektrischen Verbindung zwischen Innen- und Ausseneinheit
EP3779298A4 (de) * 2018-03-26 2021-07-14 Mitsubishi Electric Corporation Klimaanlage
CN114234549A (zh) * 2021-12-23 2022-03-25 珠海格力电器股份有限公司 一种制冷设备及其控制方法、存储介质、处理器
EP3399637B1 (de) * 2015-12-28 2022-04-20 Daikin Industries, Ltd. Stromversorgungsvorrichtung, wechselrichtervorrichtung und umrichtervorrichtung mit dieser stromversorgungsvorrichtung, sowie kühlvorrichtung und luftreiniger mit dieser wechselrichtervorrichtung oder umrichtervorrichtung

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CN112460747B (zh) * 2020-11-19 2021-11-23 珠海格力电器股份有限公司 分体式空调的通讯控制方法、装置、存储介质及下位机

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JPH07133950A (ja) * 1993-11-09 1995-05-23 Sharp Corp 空気調和機の信号伝送回路
JP2948502B2 (ja) * 1995-03-30 1999-09-13 三菱電機株式会社 マルチ式空気調和機の運転制御装置
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006057221A1 (ja) 2004-11-29 2006-06-01 Daikin Industries, Ltd. 空気調和機
US7848852B2 (en) * 2004-11-29 2010-12-07 Daikin Industries, Ltd. Air conditioner
EP1830138A4 (de) * 2004-11-29 2011-04-27 Daikin Ind Ltd Klimaanlage
US8249750B2 (en) 2004-11-29 2012-08-21 Daikin Industries, Ltd. Air conditioner
EP2042819A3 (de) * 2007-09-26 2013-01-02 Sanyo Electric Co., Ltd. Klimaanlagensystem mit Kontrolle der elektrischen Verbindung zwischen Innen- und Ausseneinheit
EP3399637B1 (de) * 2015-12-28 2022-04-20 Daikin Industries, Ltd. Stromversorgungsvorrichtung, wechselrichtervorrichtung und umrichtervorrichtung mit dieser stromversorgungsvorrichtung, sowie kühlvorrichtung und luftreiniger mit dieser wechselrichtervorrichtung oder umrichtervorrichtung
EP3779298A4 (de) * 2018-03-26 2021-07-14 Mitsubishi Electric Corporation Klimaanlage
CN114234549A (zh) * 2021-12-23 2022-03-25 珠海格力电器股份有限公司 一种制冷设备及其控制方法、存储介质、处理器

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EP1158253A3 (de) 2003-02-05
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AU753916C (en) 2005-12-22
AU2489201A (en) 2001-12-13
ES2276725T3 (es) 2007-07-01

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