ES2276725T3 - CONTROL CIRCUIT FOR AN AIR CONDITIONER. - Google Patents

Abstract

A control circuit for an air conditioner of the split type consisting of an outdoor machine (1) and an indoor machine (2) connected to each other by means of an electric power supply line and a communication line, in which the control circuit comprises a transmission photo-coupler (23), a reception photo-coupler (24) and a controller (22), arranged in a communication circuit of the indoor machine (2); wherein the transmission photo-coupler (23) and the reception photo-coupler (24) are connected together in series; and wherein the transmitting photo-coupler (23) and the receiving photo-coupler (24) are connected respectively to the controller (22), characterized in that the receiving photo-coupler (24) is connected in series to a subcircuit overcurrent protection device that includes a rectifier diode (24c) and a current cut-off device (24d, 29) to cut a circuit current in response to a current overcurrent that is greater than a predetermined current intensity value .

Description

Control circuit for a conditioner air.

Background of the invention

This invention relates to the control circuit of a split type air conditioner that has a machine  outside and at least one inside machine.

Figure 12 is a circuit diagram electrical device that shows a conventional communication device between the indoor and outdoor machines of an air conditioner, described in the Japanese patent application that remains open No. 11-193950, for example. In the drawing, the air conditioner it has an outside machine 1 and a plurality of machines interiors 2. Each of the plurality of interior machines 2 it is connected to the external machine 1 by means of three lines 3 parallel connection with each other. The outer machine 1 has a DC power circuit 12 with half wave rectification connected between the terminals of a power supply commercial 10 (to which hereafter referred to as an alternating current power supply), a source 11 of DC power for external control as source means of External control power connected between the terminals of the power supply of c.a. 10, an outer microcomputer 14 as external control means, a photo coupler external transmission 15 connected to a transmission port of the outer microcomputer 14, a photo coupler 16 of external reception connected to a reception port of the outer microcomputer 14, and a termination resistor 17 as a first resistance means connected in parallel with the external reception photo coupler 16.

In addition, each inner machine 2 has a source 21 DC power for internal control as means of Internal control power supply connected between a pair of connection lines 3a and 3b, an inner microcomputer 22 as internal control means, a photo coupler 23 of internal transmission connected to a transmission port of the inner microcomputer 22, a photo coupler 24 of interior reception for the internal microcomputer 22, and a thermistor 25 of positive temperature characteristic (hereinafter PTC) to protect overcurrent current, such as seconds resistance means that has a temperature coefficient positive, connected in series with a collector terminal of a photo-coupler 23c phototransistor 23 internal transmission

The operation is explained below. The Figure 13 is a flow chart to explain a treatment of Wrong connection decision of the indoor machine. On stage SP1, the transmission port of the inner microcomputer 22 is set in CONNECTION and an element 23c light receiver of the indoor transmission photo coupler 23 is put on DISCONNECTION In step SP2, a decision is made about a interruption in the frequency of the AC power supply. When a decision has been made in the sense that there is a interruption in the frequency of the AC power supply, it is recognized in step SP3 that the connection of the lines of indoor / outdoor connection is abnormal. In stage SP4, the port of Microcomputer transmission 22 is set to DISCONNECTED. and the element 23c photo coupler light receiver 23 internal transmission is set to CONNECT, and thus, it ends A series of treatment. On the other hand, when in the SP2 stage has made a decision that there is no interruption in the frequency of the AC power supply, in step SP5 recognizes that the connection of the interior / exterior connection lines It is normal. In step SP6, an operation based on a normal sequence

In addition, Figure 14 is a flow chart to explain a wrong connection decision treatment of The outer machine. In step SP11, the transmission port of the microcomputer is set to DISCONNECTED, and a receiving element 15c light of the external transmission photo-coupler is set to DISCONNECT. In step S12, a decision is made about a interruption in the received data. When one has been taken decision that there is an interruption in the data received, in step SP18 recognizes that the connection of lines 3 of indoor / outdoor connection is abnormal. Again in this case, it performs the treatment of step SP11. Moreover, when in step SP12 has made a decision that there is no interruption in the received data, in the SP12 stage a treatment is carried out Waiting until a decision period of wrong connection of the indoor machine 2. In step SP14, the Microcomputer transmission port 14 is set to CONNECT, and The 15c element of photo-coupler light receiver 15 external transmission is set to CONNECT. In step SP15, it make a decision about whether the transmission output and the Reception entrance are or not equal to each other. When the departure of transmission and reception output are not equal to each other, it performs a treatment in step SP18. Moreover, when in step SP15 has made a decision that the output of transmission and reception input are equal to each other, in the step SP16 it is recognized that the connection of the connection lines 3 indoor / outdoor is normal. In step SP17, a operation based on a normal sequence.

In the previous case, according to an apparatus of protection of a conventional communication circuit for a air conditioner in which a supply of AC be supplied from an outside machine to an inside machine, it has frequently raised a problem in the sense that the source AC power has been wrongly connected to a line of communication at the time of installation. When feeding from c.a. has been supplied to the communication line, there is a possibility of interrupting the photo coupler of transmission depending on the response characteristic of the positive feature thermistor to protect the circuit from communication.

Meanwhile, an air conditioner from split type has a zero crossing circuit to detect a frequency of a commercial power supply line power and a serial communication circuit to control the operation of the air conditioner by means of a communication by a serial signal between an outdoor machine and a inside machine Conventionally, a power supply of AC. for the zero crossing circuit and the rectified side in Half wave of the serial communication circuit is taken from the phase L opposite phase N (neutral line) of the power supply from c.a. Therefore, there has been a problem in the sense that, when a serial communication between the machine has started Inside and outside machine, the current of the DC component. half wave grinding of the AC power supply. and the DC component current half wave grinding of the serial communication circulate in phase N of the source of AC power US 5 642 857 is considered the most approximate to the prior art, and describes a control circuit according to the preamble of claim 1.

Summary of the invention

The present invention has been made to solve the problems described above An object of present invention is to provide a control circuit for a air conditioner that provides better protection to the circuit control, resulting in a very reliable function. This object is solved by a control circuit according to the claim 1, while in the dependent claims preferred advantageous embodiments are defined.

The control circuit is provided for a split type air conditioner, consisting of a outer machine and an inner machine connected to each other by middle of an electric power supply line and a line Communication.

The control circuit comprises a photo-coupler transmission, a receiving photo-coupler and a controller, arranged in a machine communication circuit inside.

The transmission photo coupler and the reception photo coupler are connected together in series, and also the photo coupler of transmission and reception photo coupler are connected respectively to the controller.

The receiving photo coupler is connected in series to a protection subcircuit of overcurrent, which includes a rectifier diode and an element of power cut to cut the circuit current in response to a current overcurrent that is greater than a default current intensity.

Brief description of the drawings

Figure 1 is a block diagram for control that shows an air conditioner according to a First embodiment of this invention.

Figure 2 is a block diagram for control that shows an incorrect connection of a conditioner air in case 1 and in case 2 according to the first Embodiment of this invention.

Figure 3 is a block diagram for control that shows an incorrect connection of a conditioner air in case 3 and in case 4 according to the first Embodiment of this invention.

Figure 4 is a block diagram for control that shows an incorrect connection of a conditioner air in case 5 according to the first embodiment of this invention.

Figure 5 is a flow chart for control showing the air conditioner according to the First realization

Figure 6 is a block diagram for control that shows an air conditioner according to a second embodiment of this invention.

Figure 7 is a schematic diagram of configuration in a third embodiment of this invention.

Figure 8 is another schematic diagram of configuration in the third embodiment of this invention.

Figure 9 is another schematic diagram of configuration in the third embodiment of this invention.

Figure 10 is a schematic diagram of configuration in a fourth embodiment of this invention.

Figure 11 is a flow chart for control in a fifth embodiment of this invention.

Figure 12 is a block diagram for control that shows a conventional communication circuit for a air conditioner.

       \ newpage
    

Figure 13 is a flow chart for control that shows the conventional communication circuit for a air conditioner.

Figure 14 is a flow chart for control that shows a connection decision processing error of a communication circuit for a conditioner air.

Optimal mode to realize the invention

First realization

The following is explained, with reference to the drawings, a communication circuit protection device that It constitutes a control device for an air conditioner according to a first embodiment of this invention. Figure 1 It is a block diagram for air conditioner control of this invention. In the drawing, the air conditioner consists of an exterior machine 1 and a plurality of interior machines 2. Each of the plurality of interior machines 2 has a strip  of terminals 2a comprising a terminal number N, a number terminal 2 and a terminal number 3, and the outside machine has a inner terminal strip 1a which also includes the terminals Numbers 1, 2 and 3. The terminal strips of the indoor machines are connected in parallel to the machine exterior 1 with three interior / exterior connection lines 3a, 3b and 3c, respectively. The outer machine 1 has a source of power supply 11 of c.c. for external control as source means Power supply for external control connected between terminals from a commercial power supply 10 (to which from here on hereinafter referred to as a source AC power supply), an external microcomputer 14 as means external control, a photo coupler 15 of external transmission consisting of a 15c phototransistor and a photodiode 15b connected to a transmission port of the outer microcomputer 14, a photo coupler 16 of exterior reception consisting of a phototransistor 16a connected to an external microcomputer receiving port 14 and a photodiode 16b, and a series circuit consisting of a resistor 16c of external intensity control and on a 16d external diode, connected in series to photodiode 16b.

In addition, each inner machine 2 in which three connection lines 3a, 3b and 3c are connected to terminals No. N, No. 2 and No. 3 of terminal strip 2a, respectively, It comprises: a DC power supply. 21 for control interior as a means of power supply for internal control; an internal microcomputer 22 as an internal control means; a indoor transmission photo coupler 23 that it consists of a phototransistor 23c and a photodiode 23b connected to a transmission port of the microcomputer 22 through a internal transmission transistor 23a; a photo-coupler 24 internal reception consisting in a photodiode 24b and in a phototransistor 24a connected to the microcomputer 22; a series circuit of an interior diode 23d of  half wave rectification and an internal resistance 23e current limiter connected in series to a collector terminal of phototransistor 23c of photo-coupler 23 of internal transmission; a series circuit of a 24d thermistor with positive temperature coefficient (hereinafter PTC) and a first internal diode 24c connected in series to photodiode 24b of the indoor reception photo coupler 23; a circuit in series of an inner electrolytic capacitor 26 of Zener voltage stabilization and a second inner diode 27, connected in parallel with the circuit comprising the indoor transmission photo coupler 23 and the photo-coupler 24 for interior reception; and a diode interior Zener 28 connected in parallel with the capacitor inner electrolytic voltage stabilization Zener.

A connection of the communication line in the first embodiment. When the power strip external terminals 1a of the external machine 1 and the terminal strip inside terminals 2a of the machine inside 2 have been connected correctly with the interior / exterior connection line 3a, 3b, 3c in the installation work and subsequently the feeding of electric power in a.c. 10 is supplied to the inner machine 1, Electric power supply in AC 10 is delivered as output of terminal No. N and terminal No. 2 of the outer strip of terminals 1a. The power supply in c.a.10 is transmits through the lines of interior / exterior connection 3a, 3b and is supplied to terminal No. N and terminal No. 2 of the inner terminal strip 2a, and thus the power supply of electric power in a.c. 10 is supplied to the inner machine 2. Based on the power supply in c.a.10 supplied, the external power supply 11 for control of the outer machine 1 generates an electric power supply for control, with what the external microcomputer works. Similarly, based on the power supply in AC. supplied, indoor power supply 21 for internal machine control 2 generates a power supply of electric power for control, so the microcomputer Interior 22 works. When microcomputer 22 satisfies a start-up condition of serial communication showing normal operation of the inner machine 2, and also have after three or more minutes from the beginning of the supply of Electric power supply in AC 10, a signal for CONNECTION / DISCONNECTION of the internal transmission transistor 23a is transmits to the internal transmission transistor 23a from the port of serial signal transmission of the internal microcomputer 22. After receiving the CONNECT / DISCONNECT signal, it works in CONNECTION / DISCONNECTION the internal transmission transistor 23a. When the internal transmission transistor 23a has operated in CONNECTION / DISCONNECTION, photodiode 23b of the photo-coupler 23 transmission is put on CONNECTION / DISCONNECTION. When the photodiode of indoor transmission photo coupler 23 is put on CONNECTION / DISCONNECTION, the phototransistor of the indoor transmission photo coupler 23 is put on CONNECTION / DISCONNECTION. When the phototransistor of indoor transmission photo coupler 23 is put on CONNECTION / DISCONNECTION, an internal half-wave rectifier diode 23d of the inner machine 2 rectifies the power supplied of the power supply in c.a. 10 half wave. The electric power supply in c.a.10 rectified on average wave passes through the limiting internal resistance 23e of current intensity, which is a resistance to limit the current intensity to a level that does not deteriorate at photo-coupler 23 of internal transmission and at photo-coupler 24 inside reception, and it turns into a non-insulated electrical power supply in the interior Zener diode 18. The voltage and intensity of the electric power supply in c.c. they constitute a signal in series for communication between indoor and outdoor machines based on the CONNECTION / DISCONNECTION of the photo-coupler 23 internal transmission. The signal in series it is transmitted from photo coupler 23 of internal transmission to photo coupler 24 of interior reception Once the photo coupler 24 of internal reception has received the signal in series, the photo-coupler 24 indoor reception transmits this signal to the first inner diode 24c. After the first diode indoor 24c has received the signal in series, the first indoor diode 24c transmits this signal to the PTC thermistor 24d. Once he PTC thermistor 24d has received the signal in series, the PTC thermistor 24d transmits this signal to terminal number 3 of the inner strip of terminals 2a. The inner terminal strip 2a transmits the serial signal received to an indoor / outdoor connection line 3c connecting terminal No. 3 of the inner terminal strip 2nd to terminal No. 3 of the outer terminal strip 1a of the outdoor machine 1. The serial signal is transmitted through the 3c indoor / outdoor connection line, such that the signal in series it is received by terminal Nº 3 of the external terminal strip of terminals 1a of the external machine 1.

The received serial signal is transmitted from the terminal No. 3 of the external terminal strip to the external diode 16d The external diode 16d receives the signal in series and transmits it to the external resistance 16c current intensity limiting. When the external resistance limiting current 16c of current has received the signal in series, the external resistance 16c current limiter transmits the signal in series to photo-coupler 16 for external reception. When he photo-coupler 16 external reception has received the serial signal, the receiving photo coupler 16 outside transmits the signal in series to photo-coupler 15 external transmission of the other hand That is, when photodiode 16b of the photo-coupler 16 of external reception has been set in CONNECTION / DISCONNECTION, the phototransistor 16a of the photo-coupler 16 of external reception is set to CONNECTION / DISCONNECTION in the other hand, and the signal of CONNECTION / DISCONNECTION is subsequently entered as input to the reception port of the external microcomputer 14. The external microcomputer 14 analyzes the introduced serial signal as input and replaces this signal with a control signal to activate the outside machine 1. Based on the result of this activation, a CONNECT / DISCONNECT signal is transmitted, such as the serial signal of the external machine 1, from the port of transmission of the outer microcomputer 14 to transistor 15a of outdoor transmission

Next, the transmission transistor 15a inside that has received the signal in series transmits the signal in series to photo-coupler 15 of external transmission. When the external transmission photo coupler 15 has received the serial signal, photodiode 15b of the photo-coupler 15 external transmission is put on CONNECTION / DISCONNECTION and the phototransistor 15c of the photo-coupler 15 external transmission is put on CONNECTION / DISCONNECTION. Once the phototransistor 15c of the photo-coupler 15 external transmission has set to CONNECT / DISCONNECT, the CONNECT / DISCONNECT signal of the phototransistor 15 can be superimposed on the serial signal received from photo-coupler 16 of external reception in the external transmission photo coupler 15 connected to phase N of the power supply in c.a, 10. The superimposed serial signal is transmitted from the photo-coupler 15 external transmission to terminal N of the external terminal strip 1a. The terminal No. N of the external terminal strip 1a receives the signal in series, and transmits this signal to the connection line indoor / outdoor 3a that connects terminal No. N of the terminal block outside of terminals 1a to terminal No. N of the inner strip of terminals 2a of the indoor machine 2. The serial signal is transmits through the indoor / outdoor connection line 3a. He terminal N of the internal terminal strip 2a receives the serial signal and transmits it to the interior Zener diode 28. In others words, the minus (-) side of the electrolytic inner capacitor 26 Zener voltage stabilization that acts as a setting Reference ground of the serial communication circuit is set in CONNECTION / DISCONNECTION based on the CONNECTION / DISCONNECTION of the serial signal of the outer machine 1, such that the transmission photo-coupler 23 phototransistor inside is set to ON / OFF on the photo-coupler 15 of external transmission. He indoor transmission photo coupler 23 receives the serial signal and subsequently transmit it to photo-coupler 24 of interior reception, so the indoor reception photo coupler 24 receives This signal in series. When photodiode 24b of photo-coupler 24 of interior reception is set to CONNECTION / DISCONNECTION based on the received serial signal, the photo-coupler 24a phototransistor 24a Indoor reception is set to ON / OFF. When he photo-coupler 24a phototransistor 24a Indoor reception is set to ON / OFF, the port of reception of the internal microcomputer 22 becomes High / Low, such that the inner microcomputer 22 receives and analyzes the serial signal of the outdoor machine, and transmits a new signal in series from the transmission port of the internal microcomputer 22. Based on the previously described circulation of serial signals, serial communication between the outer machine 1 and inner machine 2.

The following is described by cases the first realization.

Case one

The outer terminal strip 1a of the external machine 1 and the internal terminal strip of the machine interior 2 have been wrongly connected during installation, as shown by the indoor / outdoor connection lines 31 in Figure 2.

When the outer machine 1 and the machine interior 2 have been incorrectly connected in the installation by indoor / outdoor connection lines 31 and power supply electric in c.a. 10 is supplied to the outer machine 1, the electric power supply in c.a. 10 is supplied to the power supply 11 for machine external control exterior 1. The power supply 11 for external control generates a control power supply, and the outdoor machine 1 goes into a waiting state of a serial signal coming from the inner machine 2. However, the power of electric power in a.c. 10 has not been supplied correctly to the inner machine 2, since the connecting lines indoor / outdoor 31 have been connected in such a way that they connect the terminal N of the external terminal strip 1a of the machine outside 1 to terminal No. N of the inside terminal strip 2a of the inner machine 2, the terminal No. 2 of the outer strip of terminals 1a to terminal No. 3 of the inner terminal strip 2a, and terminal No. 3 of the outer terminal strip 1a to terminal No. 2 of the inner terminal strip 2a, respectively. That is, the electric power supply in AC. 10 is not being supplied between terminal No. N and the terminal No. 2 of the inner terminal strip of machine 2a interior 2, so the power supply 21 for control inside of the machine inside 2 cannot work and the machine interior 2 does not work (as the internal microcomputer 22 cannot function, the indoor machine does not work even when it has pressed a test run switch). For other part, the electric power supply in c.a. 10 is supplied between terminal No. N and terminal No. 3 of the inner strip of terminals 2a of the inner machine 2. The power supply electric in c.a. 10 is supplied between terminal No. 3 of the inner terminal strip 2a to thermistor PTC 24. However, as the PTC thermistor 24 is connected to the cathodes of the second internal diode 27 and of the first internal diode 24c, does not circulate current to the second inner diode 27 or the first inner diode 24c, bringing the machine's serial communication circuit 2 is protected.

In addition, the electric power supply in AC. 10 supplied from terminal N of the internal terminal block terminal 2a is supplied to the second inner diode 27 of the indoor machine 2. The power supply is then supplies the PTC 24d thermistor, terminal No. 3 of the terminal strip of terminals 2a, and then to terminal Nº 2 of the external terminal strip 1a of the external machine 1 through of an indoor / outdoor connection line 31. Then, the power supply returns to the power supply of electric power in a.c. 10.

However, when the power supply electric in c.a. 10 is supplied on the route above described, a current with overcurrent continues to circulate due to a low load resistance of its circuit, in such a way that the second inner diode 27 that is part of the circuit, is Burning, In order to prevent this burning, internal resistance of the PTC 24d thermistor instantly increases from a few ohm a few megaohms when the current of Overcurrent circulates to the PTC 24d thermistor. In this way, it cuts the overcurrent current, which protects the second interior diode 27.

This state in which the resistance of the PTC 24d thermistor is a few ohms, continue until it stops power supply power supply in c.a. 10. Once the power supply has ceased electric in c.a. 10, the outer machine 1 and the inner machine 2 connect correctly through the connection lines indoor / outdoor 3 as shown in Figure 1 and the power supply of electric power in c.a. 10 s supplies to the outside machine 1. In this way, normal operation is obtained.

Case 2

The outer terminal strip 1a of the outer machine 1 and the inner terminal strip 2a of the Inside machine 2 have been wrongly connected in the installation, as shown by an indoor / outdoor connection lines 32 in Figure 2.

When the outer machine 1 and the machine interior 2 have been incorrectly connected in the installation by indoor / outdoor connection lines 32 and power supply electric in c.a. 10 is supplied to the outer machine 1, the electric power supply in c.a. 10 is supplied to the 11 power supply for external control of the outside machine 1. The power supply 11 for control outside generates a power supply for control, and the outer machine 1 goes into a waiting state of a signal in series from the inner machine 2. However, the electric power supply in c.a. 10 has not been supplied correctly to the inner machine 2, since the lines of indoor / outdoor connection 32 in case 2 have been connected so that connect terminal N of the external terminal strip 1st of the outer machine 1 to the terminal No. 3 of the inner strip of terminals 2a of the inner machine 2, terminal No. 2 of the terminal strip from terminals 1a to terminal No. N of the strip inside of terminals 2a, and terminal No. 3 of the outer strip from terminals 1a to terminal No. 2 of the internal terminal strip of terminals 2a, respectively.

According to the above, the feeding of electric power in a.c. 10 is not being supplied between terminal No. N and terminal No. 2 of the inner strip of terminals 2a of the inner machine 2, whereby the source of 21 power supply for internal control of the inner machine 2 cannot work and inner machine 2 cannot works. In other words, as the inner microcomputer 22 does not can work, the inside machine 2 does not work even if Pressed an operation switch for testing. For other part, the electric power supply in c.a. 10 is supplied between terminal No. N and terminal No. 3 of the inner strip of terminals 2a of the inner machine 2. The power supply electric in c.a. 19 is supplied from terminal No. 3 of the inner terminal strip 2a to PTC thermistor 24d. But nevertheless, as the PTC 24d thermistor is connected to the cathodes of the second internal diode 27 and of the first internal diode 24c, does not circulate current to the second inner diode 27 or the first inner diode 24c, which protects the serial communication circuit from the inner machine 2. Additionally, the power supply electric in c.a. 10 supplied from terminal No. N of the inner terminal strip 2a is supplied to the second diode inside 27 of the inside machine 2. The power supply is then supplies the PTC 24d thermistor, terminal No. 3 of the terminal strip of terminals 2a, and then to terminal No. N of the external terminal strip 1a of the external machine 1 through of an interior / exterior connection line 32. Then, the power supply returns to the power supply of energy in c.a. 10.

However, when the power supply electric in c.a. 10 is supplied on the route above described, a current with overcurrent continues to circulate due to a low load resistance of its circuit, so the Second inner diode 27, which is a part of the circuit, burns. In order to prevent this burning, the internal resistance of the PTC 24d thermistor increases instantaneously from a few ohms up to a few megaohms when the current with overcurrent circulates to the thermistor PTC 24d. Therefore, the current with Overcurrent is cut, so that the second is protected internal diode 27. This state continues until the supply ceases of the electric power supply in c.a. 10. Once you have ceased power supply in c.a. 10, the machine outside 1 and inside machine 2 connect correctly via the interior / exterior connection lines 3, as has been shown in Figure 1, and the electric power supply in AC. 19 is supplied to the outside machine 1. In this way, it Get normal operation.

Case 3

The outer terminal strip 1a of the outer machine 1 and the inner terminal strip 2a of the Inside machine 2 have been wrongly connected in the installation, as shown by indoor / outdoor connection lines 33 in Figure 2.

When the outer machine 1 and the machine interior 2 have been incorrectly connected in the installation by internal / external connection lines 33 and power supply electric in c.a. 10 is supplied to the outer machine 1, the electric power supply in c.a. 10 is supplied to the 11 power supply for external control of the outside machine 1. The power supply 11 for control outside generates a power supply for control, and the outer machine 1 goes into a waiting state of a signal in series from the inner machine 2. However, the electric power supply in c.a. 10 has not been supplied correctly to the inner machine 2, since the lines of indoor / outdoor connection 33 have been connected so that they connect terminal No. N of the outer terminal strip 1a of the external machine 1 to terminal No. 2 of the internal terminal strip of terminals 2a of the inner machine 2, terminal No. 2 of the external terminal strip 1a to terminal No. 3 of the terminal block inside of terminals 2a, and terminal No. 3 of the outer strip from terminals 1a to terminal N of the internal terminal strip of terminals 2a, respectively.

The electric power supply in c.a. 10 it is not being supplied between terminal No. N and terminal No. 2 of the inner terminal strip 2a of the inner machine 2, bringing the electrical power supply 21 to inside control of the inside machine 2 cannot work and the Inside machine 2 does not work. In other words, like the inner microcomputer 22 cannot work, the inner machine 2 does not work even if an operating switch has been pressed for test Moreover, the electric power supply in AC. 10 is supplied between terminal No. 2 and terminal No. 3 of the inner terminal strip 2a of the inner machine 2. The electric power supply in c.a. 10 supplied from the terminal No. 3 of the inner terminal strip 2a is supplied to the PTC 24d thermistor. However, the PTC 24d thermistor is connected to the cathodes of the second inner diode 27 and the first interior diode 24c.

Therefore, no current flows to the second diode interior 27 or the first interior diode 24c, thereby protecting The serial communication circuit of the indoor machine 2. By On the other hand, the electric power supply in c.a.10 supplied from terminal No. 2 is supplied to the internal diode 23d half wave rectifier of the inner machine 2, and then to the internal current limiting resistance 23e. The internal current limiting resistance 23e limit the intensity to a level that does not deteriorate the indoor transmission photo coupler 23 and the photo-coupler 24 of interior reception. So, even though the electric power supply in c.a. 10 se wrongly supply between terminal No. 2 and terminal No. 3 of the inner terminal strip 2a of the inner machine 2, the Serial communication circuit of the indoor machine 2 is protected.

Case 4

The outer terminal strip 1a of the outer machine 1 and the inner terminal strip 2a of the Inside machine 2 have been wrongly connected in the installation, as shown by indoor / outdoor connection lines 34 in Figure 2.

When the power supply in AC. 10 has been supplied to the external machine 1, the power AC power 10 is supplied to the source of 11 power supply for external control of the Outside machine 1. The power supply of electric power 11 for external control generates a power supply electric for control, and the outer machine 1 goes into a state of Waiting for a serial signal from the indoor machine 2. However, Electric power supply in AC 10 is not Properly supplying the inner machine 2, since the indoor / outdoor connection lines 34 are connected in such a way so that they connect the terminal N of the external terminal of terminals 1a of the external machine 1 to terminal No. 3 of the inner terminal strip 2a of the inner machine 2, the terminal No. 2 of the outer terminal strip 1a to terminal No. 2 of the inner terminal strip 2a, and terminal No. 3 of the terminal strip from terminals 1a to terminal No. N of the strip inside terminals 2a.

The electric power supply in c.a. 10 it is not being supplied between terminal No. N and terminal No. 2 of the inner terminal strip 2a of the inner machine 2, bringing the electrical power supply 21 to inside control of the inside machine 2 cannot work and the Inside machine 2 does not work. In other words, like the inner microcomputer 22 cannot work, the inner machine 2 does not work even if an operating switch has been pressed for test Moreover, the electric power supply in AC. 10 is supplied between terminal No. 2 and terminal No. 3 of the inner terminal strip 2a of the inner machine 2. The electric power supply in c.a. 10 supplied from the terminal No. 3 of the inner terminal strip 2a is supplied to the PTC 24d thermistor. However, as the PTC 24d thermistor is connected to the cathodes of the second inner diode 27 and the first interior diode 24c. no current circulates to the second inner diode 27 or the first inner diode 24c, which protects the Serial communication circuit of the indoor machine 2.

The electric power supply in c.a.10 supplied from terminal No. 2 is supplied to the internal diode 23d half wave rectifier of the inner machine 2, and then to the internal current limiting resistance 23e. The internal current limiting resistance 23e limit the intensity to a level that does not deteriorate the indoor transmission photo coupler 23 and the photo-coupler 24 of interior reception. So, even though the electric power supply in c.a. 10 se wrongly supply between terminal No. 2 and terminal No. 3 of the inner terminal strip 2a of the inner machine 2, the Serial communication circuit of the indoor machine 2 is protected.

Case 5

The outer terminal strip 1a of the outer machine 1 and the inner terminal strip 2a of the Inside machine 2 have been wrongly connected in the installation, as shown by indoor / outdoor connection lines 35 in Figure 2.

When the power supply in AC. 10 is supplied to the external machine 1, the power supply electric power in a.c. 10 is downloaded as output from the terminal No. N and terminal No. 2 of the outer strip of 1st terminals. The electric power supply in c.a, 10 is transmits through the interior / exterior connection lines 35 and is supplied to terminal No. 2 and terminal No. N of the terminal block inside terminals 2a, and thus the power supply electric in c.a. 10 is supplied to the inner machine 2. Based on the power supplied by electric power in AC. 10, the electrical power supply 21 for internal control of the internal machine 2 generates a feed for control, with which the external microcomputer works. Similarly, based on the power supplied electric in c.a. 10, the power supply 21 for control inside generates a control supply, so that the Internal microcomputer works. When the microcomputer 22 satisfies a condition of beginning serial communication that shows normal operation of the inner machine 2, and have after three or more minutes from the beginning of the feeding of power supply 10, a signal for CONNECTION / DISCONNECTION of the internal transmission transistor 23a is transmits to the internal transmission transistor 23a from the port of serial signal transmission of microcomputer 22. After reception of the transmitted CONNECTION / DISCONNECT signal, the internal transmission transistor 23a is put on CONNECTION / DISCONNECTION. When the transmission transistor 23a inside has been activated to ON / OFF, photodiode 23b of the  photo-coupler 23 internal transmission gets in CONNECTION / DISCONNECTION. When photodiode 23b of indoor transmission photo coupler 23 has set to ON / OFF, the phototransistor 23c of the indoor transmission photo coupler 23 is put on CONNECTION / DISCONNECTION. When the phototransistor 23c of indoor transmission photo coupler 23 has set to ON / OFF, the internal rectifier diode 23d Half wave rectifies the power supplied from the source of power supply in c.a. 10 in the form of half wave. The electric power supply in c.a. 10 rectified in half wave passes through the limiting internal resistance 23e of current intensity, which is a resistance to limit a current intensity to a level that does not deteriorate the photo-coupler 23 of internal transmission nor the indoor reception photo-coupler 24, and It constitutes a non-isolated power supply in c.c. in the diode Zener interior 28. The voltage and intensity of the source of electric power supply in c.c. they constitute a serial signal for communication between indoor machines and outside based on the CONNECTION / DISCONNECTION of the photo-coupler 23 internal transmission. The signal in series it is transmitted from photo coupler 23 of internal transmission to photo coupler 24 of interior reception Once the photo coupler 24 of internal reception has received the signal in series, the photo-coupler 24 indoor reception transmits this signal to the first inner diode 24c. After the first diode interior 24 has received the signal in series, the first interior diode 24c transmits this signal to the PTC thermistor 24d. After the PTC thermistor 24d has received the signal in series, the PTC thermistor 24d transmits this signal to terminal No. 3 of the internal terminal strip of terminals 2a. The inner terminal strip 2a transmits the serial signal received to an indoor / outdoor connection line 35 connecting terminal No. 3 of the inner terminal strip 2nd to terminal No. 3 of the first outer terminal strip 1a of the outdoor machine 1. The serial signal is transmitted through the inner / outer connection line 35, such that the serial signal is received by terminal No. 3 of the terminal block external terminal 1a of the external machine 1. The signal in received series is transmitted from terminal No. 3 of the terminal block external terminals to the external diode 16d. 16d outdoor diode receives the signal in series and transmits it to the external resistance 16c current intensity limiter.

When the external current-limiting current resistance 16c has received the signal in series, the external current-limiting resistance 16c transmits the signal in series to the external receiving photo-coupler 16. When the external reception photo coupler 16 has received the serial signal, the external reception photo coupler 16 transmits the serial signal to the external transmission photo coupler 15 on the other side. That is, when the photodiode 16b of the external reception photo-coupler 16 has been set to ON / OFF, the phototransistor 16a of the external reception photo-coupler 16 is set to ON / OFF on the other hand, and the CONNECTION signal / DISCONNECTION is subsequently introduced as input to the reception port of the microcomputer 14. The external microcomputer 14 analyzes the serial signal introduced as input and replaces this signal with a control signal to activate the external machine 1. Based on the result of this operation , a CONNECT / DISCONNECT signal is transmitted as the serial signal of the outdoor machine 1 from the transmission port of the microcomputer 14 to the external transmission transistor 15a. Next, the external transmission transistor 15a that has received the serial signal transmits the serial signal to the external transmission photo coupler 15. When the external transmission photo-coupler 15 has received the serial signal, the photodiode 15b of the external transmission photo-coupler 15 is set to ON / OFF, and the phototransistor 15c of the external transmission photo-coupler 15 is set to CONNECT / DISCONNECTION. When the phototransistor 15c of the external transmission photo-coupler 15 has been set to ON / OFF, the ON / OFF signal of the phototransistor 15c can be superimposed on the serial signal received from the external receiving photo-coupler 16, in the photo - external transmission coupler 15 connected to phase N of the AC power supply 10 The superimposed serial signal is transmitted from the external transmission photo coupler 15 to terminal N of the external terminal strip 1a. Terminal No. N of the outer terminal strip 1a receives the signal in series, and transmits this signal to the indoor / outdoor connection line 35 that connects terminal No. N of the outer terminal strip 1a and terminal No. 2 of the inner terminal strip 2a of the inner machine 2. The serial signal is transmitted through the inner / outer connection line 35. Terminal No. 2 of the inner terminal strip 2a receives the signal in series and transmits it again to the inner diode 23d half wave rectifier. However, since the serial communication circuit is not connected to the DC power supply in the indoor Zener diode 28, serial communication is not established. At this time, a signal of a malfunction is visually displayed on a monitor of the indoor machine 2 to report the situation
abnormal.

Figure 5 is a flow chart showing the operation of the air conditioner of this invention, whose Diagram is explained below. In stage SP1, the machine Inside and outside machine are connected during installation. In step SP2, the power is supplied to the outside machine of electric power in c.a. Then, in step SP3, the Function test switch of the indoor machine. In stage SP4, confirms whether or not the indoor machine has worked. If the indoor machine works, in step SP5, it is expected that a period of three minutes elapses after it has started power supply power supply in c.a. in stage SP2. Then, in step SP6, if both the machine outside as the inside machine work normally, it has Connection completed during installation. If the machine outside and inside machine do not work normally in the stage SP6, in step SP8, the source of electric power supply in c.a. When it has disconnected The electric power supply in AC, at the stage SP9 checks the wrong connection of connection lines  Between the outer machine and the inner machine. If there is a wrong connection in step SP10 the connection is corrected wrong between the inner machine and the outer machine. He procedure then returns again to step SP2, and the electric power supply in c.a. In step SP9, if the connection is correct without an incorrect connection, The procedure continues to step SP11. As the conditioner of air does not work normally due to factors other than wrong connection between the inner machine and the outer machine, other parts such as the power strip are checked and replaced terminals The procedure returns to step SP2 again, and is connect the power supply of electric power in a.c.

On the other hand, in step SP4, it is checked whether The inside machine works or not. If the inside machine does not works, in step SP12 an incorrect connection of the connection lines between the inner machine and the outer machine. At this time, although the electric power supply in c.a. the serial signal circuit is supplied by the connection wrong, it is possible to protect the series circuit of the machine interior by means of the PTC thermistor, the internal resistance current limiter and the internal diode in the SP13 stage. In other words, instead of disconnecting the source of electric power supply in c.a. in step SP14, it could disconnect the power supply from electric power in AC. at the moment the wrong connection is found. A once the power supply has been disconnected electric in AC, in step SP 15 the connection between the Inside machine and outside machine. Then the procedure returns to step SP2, and the power supply of electric power in a.c. In stage SP3 and stage SP4 Confirm that the inner machine and the outer machine work usually. The procedure reaches its FINAL in stage SP7 after going through stages SP5 and SP6.

As explained above, agree with the present invention, even in the case that the inner machine and the outside machine has been wrongly connected and then supplied the electric power supply in c.a., the series circuit does not deteriorate, so it is not necessary replace the strips affected by the wrong connection. How result, the transport rate of the strips decreases, increases the benefit, and the replacement of the strips is unnecessary in the installation. Therefore, the performance of the installation. In addition, in the case where the series circuit is used of the inside machine shown in Figure 1, although the answer PTC thermistor is delayed and the change in resistance is delayed from a few ohms to a few megaohms, it's only charged the second inner diode 27, and the indoor transmission photo coupler 23 and the photo-coupler 24 inside reception do not result influenced at all. Therefore, the use can be ensured continued of the strips in the future, without replacing the strips

Second realization

Figure 6 is a block diagram that shows a structure in which the outer machine and the machine Interior have normally been connected in a second embodiment. In Figure 6, the PCT thermistor 24d of the first embodiment has been replaced by a fuse 29, and the rest of the structure is the same as in Figure 1. In this structure, fuse 29 jumps when a current with overcurrent circulates in the circuit of communication due to an incorrect connection.

Third realization

They are explained below with reference to the Figure 7, a structure and operation of a third Embodiment of this invention. First, as shown in this drawing, when an outer terminal strip (403) of a external machine (401) and an internal terminal strip (413) of an interior machine (412) of an air conditioner have connected via an interior / exterior connection lines (411), and An electric power supply is supplied in AC. (402) a the outside machine (401), the electric power supply in c.a, (402) discharged at the exit from terminal No. N and the terminal No. 2 of the outer terminal strip (403) is supplies terminal No. N and terminal No. 2 of the terminal block inside terminals (413) by means of connection lines indoor / outdoor (411), which supplies power to Electric power to the indoor machine (412). Power supply electrical energy is converted into a low voltage by a power supply (420) for internal machine control interior (412) to create an electric power supply for internal control in order to activate a microcomputer interior (434).

At the same time, the power supply electric in c.a. similarly it becomes a low voltage by means of a power supply (404) for external control of the outer machine (401), in order to create a feed of electrical energy for external control in order to operate a outer microcomputer (405).

Then when a microcomputer interior (434) is activated by an electric power supply for internal control, an internal shock coil (416) eliminates the noise of the power supply in electrical power in a.c. (402), which is a commercial power supply, so that the power supply in c.a. No noise Then, the source of power is rectified in half wave using an internal diode half wave rectifier (421) that is connected to phase N of the neutral line, that is, to terminal No. N of the strip inside terminals (413) of the inside machine (412). After, The power supply circulates at a resistance interior (422) current intensity limiter, which limits this to a level of intensity that does not deteriorate the photodiode of an inside photo-coupler (423) of zero crossing, and then transmitted to the inner photo coupler (423) zero crossing.

As a result, the photodiode of inside photo-coupler (423) zero crossing makes Let your ON / OFF transistor work. At the same time, this ON / OFF signal is transmitted to a terminal zero crossing input of the inner microcomputer (434). By therefore, the internal microcomputer controls the operation of the indoor machine based on this operating signal.

In this case, the limited intensity of the current passing through the photodiode of inside photo-coupler (423) zero crossing returns to phase L on the opposite side of the neutral line of the power supply in c.a. (402) (terminal No. 2 of the strip inside of machine terminals inside). The above exposed constitutes the structure and operation of a circuit zero crossing that detects the frequency of a source of commercial feeding by means of a rectification of half wave.

A structure is explained below and the Serial communication circuit operation.

First, the inner microcomputer (434) that has received the serial signal transmits a serial signal from its transmission port to put ON / OFF to an internal transmission transistor (432), thereby doing The serial communication circuit works. Then, the photodiode of the transmission photo-coupler (431) interior connected to this internal transmission transistor (432) is set to CONNECT / DISCONNECT so that, accordingly, your Phototransistor is set to ON / OFF.

Then, based on the operation CONNECTION / DISCONNECTION of this phototransistor, the power supply of electric power supplied from phase L opposite the line of neutral of the electric power supply in c.a. (402) is rectified in half wave using a rectifier diode of Half wave (424) of internal communication. Additionally, a internal resistance (425) series current limiting limits the power supply to an intensity level of current that does not damage the photo coupler (431) internal transmission and to a photo coupler (433) of interior reception. After that, an interior Zener diode (426) converts the power supply into a electric power supply in c.c. not isolated

Then, based on the CONNECT / DISCONNECT the photo coupler (431) from internal transmission, voltage and current intensity of the converted DC power supply become a serial signal which is a communication signal between machines indoor and outdoor This serial signal is transmitted to a diode interior (429) through the photo coupler (433) of interior reception, and then to terminal No. 3 of the internal terminal of terminals (413) connected to terminal No. 3 of the terminal block outside terminals (403) through a PTC thermistor (430).

Then the transmitted serial signal to terminal No. 3 of this external terminal strip (403), transmits to an external resistance (408) intensity limiter of current through an external diode (607). Serial signal it is then limited to a level of current intensity that does not damage the photodiode of an external photo coupler (406), and transmitted to a photo coupler (410) of external transmission through the photodiode of the photo-coupler (406) of external reception.

As a result, the photodiode of the external receive photo-coupler (406) is set to ON / OFF
CONNECTION and therefore your phototransistor is set to ON / OFF. When the CONNECT / DISCONNECT signal is input as input to the reception port of the external microcomputer (405), the external 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 the control content as a serial signal (a CONNECT / DISCONNECT signal) from the transmission port to the external transmission photo-coupler (410) through a transistor ( 409) external transmission. As a result, the photodiode of the external transmission photo-coupler (410) is set to ON / OFF, and at the same time, its phototransistor is also set to ON / OFF.

Therefore, the CONNECT / DISCONNECT signal transmitted from the external transmission transistor (409) to outdoor transmission photo-coupler (410) is overlays on the serial signal received from photo-coupler (406) of external reception in the outdoor transmission photo coupler (410) connected to phase N.

Then the superimposed serial signal is transmits from the photo coupler (410) of external transmission to terminal N of the external terminal of terminals (403), the No. N terminal of the inner strip of terminals (413) connects to terminal N of the external terminal of terminals (403), and then the "minus" (-) side of the source c-c power. in the inner Zener diode (426) is connected to terminal N of the internal terminal strip of terminals (413).

As a result, a grounding of reference of the serial communication circuit which is the side "less" of an inner electrolytic capacitor (427) of Zener voltage stabilization is also put in CONNECTION / DISCONNECTION according to the serial signal of CONNECT / DISCONNECT the photo coupler (410) from outdoor transmission Therefore, the phototransistor of the photo-coupler (411) of internal transmission gets in CONNECTION / DISCONNECTION, and the photodiode connected to the phototransistor it is also set to CONNECT / DISCONNECT.

Then, based on the CONNECTION / DISCONNECTION of this photodiode, the receiving part of the Inner microcomputer (434) becomes High / Low, and the internal microcomputer (434) analyzes the serial signal of the outside machine and transmits a new signal in series from the transmission port of the internal microcomputer (434).

As explained above, the power supply for the communication circuit in series between the inner machine and the outer machine is taken from the L phase opposite to the N phase of the power supply of electric power in AC, and electric power supply for the zero crossing circuit to detect the frequency of the AC power supply it is taken through a diode half-wave rectifier of phase N which is a neutral line of the c-a power supply. Therefore, the respective current intensities of DC components. I dont know they add together, and these currents circulate to the respective phases of the electrical power supply in AC, of such so that a control circuit can be obtained as a result very reliable for a split type air conditioner that prevents the appearance of a malfunction of each machine caused by higher frequency harmonics.

Additionally, the following explains a structure and operation of another example of the third embodiment with references to figure 8.

First, as shown in this drawing, when an external terminal strip (503) of a machine exterior (501) and an internal terminal strip (513) of a Inside machine (512) of an air conditioner have been connected via internal / external connection lines (511) and supplied an electric power supply in c.a. to the inside machine (512), the electric power supply in c.a. (502) delivered as output from a terminal No. N and a terminal No. L of the terminal block Inside terminals (513) becomes a low voltage via a power supply (520) for internal control and Makes a power supply for internal control Operate an internal microcomputer (534).

Next, an internal shock coil (516) eliminates noise from the power supply electric in c.a. (502) from a commercial power supply. The Electric power supply is rectified as an average wave using a half-wave internal rectifier diode (521) connected to phase N of the neutral line, that is, to the terminal No. N of the internal terminal strip (513) of the machine interior (512). After this, the power supply rectified electrical is transmitted to an internal resistor (522) current limiter to limit this to a level of intensity that does not deteriorate a photodiode of a interior photo-coupler (523) zero crossing, and It is then transmitted to the internal photo coupler (523) Zero crossing. As a result, the photodiode of interior photo-coupler (523) zero crossing puts to your phototransistor in CONNECTION / DISCONNECTION. At the same time, this signal is introduced as input to a crossing input port by zero of the inner microcomputer (534) such that the Inner microcomputer controls machine operation interior based on this signal.

In this case, the current that has passed to through the inner photo coupler photodiode (523) zero crossing returns to phase L opposite the line of neutral of the electric power supply in a.c. (502) is that is, to terminal No. L of the internal terminal strip (513) of the inside machine (512). The above describes refers to the structure and operation of the zero crossing circuit for detect the frequency of the power supply in AC. by means of rectification in half wave.

The circuit of serial communication

First, in this circuit of serial communication, a signal to put ON / OFF an internal transmission transistor (532) is transmitted from the serial microcomputer serial signal transmission port (534). Then the photodiode of internal transmission photo coupler (531) connected to this internal transmission transistor (532) is put on CONNECTION / DISCONNECTION, bringing the phototransistor of the internal transmission photo coupler (531) Subsequently it is set to ON / OFF.

However, at this time, as a 52c relay (535) depicted in the drawing has not yet been connected, the phase L opposite the neutral line of the power supply electric in c.a. (502) at terminal No. L of the internal terminal block of terminals (513) of the inside machine (512) has not been supplied to a terminal No. 2 of the internal terminal strip of terminals Therefore, the serial communication circuit does not It works, and wait (for three minutes, for example).

Then when the microcomputer interior (534) considers that the starting condition has been fulfilled of serial communication, in other words, the inside machine 512 works normally after three or more minutes from the beginning of the power supply electric in c.a. (502), the inner microcomputer (534) transmits a CONNECT signal to a relay activation transistor (536) 52C, thereby setting the relay 52C to CONNECT. Therefore, the phase L opposite the neutral line of the power supply electric in c.a. (502) connects to a terminal No. 2 of the terminal block external terminals (503) of the external machine (501) of the air conditioner through terminal No. 2 of the terminal block inside terminals (513) of the inside machine (512) and one indoor / outdoor connection line (511). That way, the electric power supply in c.a. (502) is supplied to the outside machine (501) of the air conditioner.

Next, the AC power supply (502) supplied to the outside machine (501 is supplied to the power source for external control (504), such that the external microcomputer (505) functions to make operate at the outside machine At the same time, the AC power supply (502) is also supplied to the serial communication circuit of the indoor machine
(512).

However, at this time, the transistor (532) of internal transmission and the subsequent phototransistor of the photo-coupler (531) of internal transmission se set to ON / OFF according to the serial signal of the interior microcomputer (534). Therefore, the operation is added next.

Electric power supply supplied from terminal No. 2 of the internal terminal strip of terminals (513) of the inner machine (52) is rectified on average wave using the half wave rectifier diode (524) of internal communication, and then limited by resistance indoor (525) current limiter in series current intensity level that does not deteriorate at photo-coupler (531) of internal transmission or to photo-coupler (533) of interior reception. Then, an interior Zener diode (526) converts the power supply electric in a power supply in c.c. not isolated Based on the CONNECT / DISCONNECT the photo coupler (531) from indoor transmission, the power supply is converts into a serial communication signal between the machines indoor and outdoor The serial communication signal is transmitted to a diode (529) of internal communication through the photo-coupler (533) of interior reception, and then to a terminal No. 3 of the inner terminal strip (513) a through an internal resistance 2 (530) current limiting serially.

Then the serial signal is transmitted to terminal No. 3 of the outer terminal strip (503) of the external machine (501) connected to the internal terminal strip (513), and then to an external resistance (508) limiting current intensity through an external diode (507). After of the above, the serial signal is also transmitted to a photo-coupler (510) of external transmission to via a photo coupler (506) of reception Exterior. As a result, the photodiode of photo-coupler (506) of external reception gets in CONNECTION / DISCONNECTION, and at the same time, your phototransistor will it also puts on CONNECTION / DISCONNECTION.

Next, the CONNECT / DISCONNECT signal is entered as input to the microcomputer receiving port exterior (505) in accordance with the CONNECTION / DISCONNECTION of the phototransistor The outer microcomputer (505) then analyzes the result entered as input and replaces a control signal to operate the outside machine (501). Therefore the signal CONNECTION / DISCONNECT is transmitted as a serial signal from the outer microcomputer (505) to the transmission transistor (509) exterior, and the photo coupler photodiode (510) of External transmission is set to ON / OFF, so your Phototransistor is also set to ON / OFF. Through This CONNECTION / DISCONNECT, the CONNECTION / DISCONNECT signal transmitted from the external transmission transistor to outdoor transmission photo-coupler (510) overlays on the serial signal received from photo-coupler (506) of external reception, in the outdoor transmission photo-coupler (510) connected to phase N of the power supply in AC.

Then the superimposed serial signal is transmits from the photo coupler (510) of external transmission to terminal N of the external terminal of terminals (503), is received by terminal No. N of the terminal block inside terminals (513), and then transmitted to the side "less" (-) of the electric power supply in c.c. in the inner Zener diode (526). Therefore, a grounding of reference of the serial communication circuit which is the side "less" of an inner electrolytic capacitor (527) Zener voltage stabilizer is set to ON / OFF based on the serial signal of the photo coupler (510) external transmission. As a result, the phototransistor of the internal transmission photo coupler (533) also puts ON / OFF, and the photodiode connected to the Phototransistor is also set to ON / OFF.

As a consequence, the reception port of the Inner microcomputer (534) is set to High / Low, such that the inner microcomputer (534) receives and analyzes the signal in external machine series to transmit a new signal in series from its transmission port.

As explained above, after the internal microcomputer has confirmed the operating status of the inside machine, the electric power supply for the serial communication circuit between the indoor machine and the outside machine is taken from the L phase opposite to the N phase of the electric power supply in c.a. Then the power supply for the zero crossing circuit in order to detect the frequency of the power supply electric in c.a. it is taken through a rectifier diode of half wave, from phase N of the neutral line of the supply of electric power in c.a. Therefore, after confirming the operating status of the indoor machine, the respective DC currents do not add together, and you are currents circulate to the respective phases of the feeding of electrical energy in AC, which can be obtained as result a very reliable control circuit for a conditioner of split type air that prevents a failure of operation of each machine caused by the harmonics of higher frequencies

In addition, Figure 9 shows a circuit of control of a case in which a power supply electric in c.a. has been provided separately for the machine outside (601) and for the inside machine (612). Based on this provision, a source connection of power to supply the power supply in c.a. from the outer machine (601) to each inner machine (612).

Quarter realization

A structure is explained below and the operation of a fourth embodiment with reference to Figure 10.

First, as shown in this drawing, when an external terminal strip (803) of a machine exterior (801) and an internal terminal strip (813) of a Inside machine (812) of an air conditioner have been connected with interior / exterior connection lines (811), and it has supplied with an electric power supply in a.c. (802) to the outside machine (801), the power supply in AC. (802) delivered as output from a No. N terminal and a terminal No. 2 of the outer terminal strip (803) is transmits through the indoor / outdoor connection line (811) and is supplied to a No. N terminal and a No. 2 terminal of the inner terminal strip (813). On the machine side outside, an electric power supply (804) for external control generates a power supply of control to operate an external microcomputer (805). Similarly, on the side of an indoor machine, a source of Electric power supply (820) for internal control generates a control power supply to operate a interior microcomputer

Then when it has been operated this internal microcomputer (834), an internal shock coil (816) suppresses noise from the power supply electric in c.a. (802) as a commercial power supply to get a power supply in c.a. without noise. The Electric power supply is then rectified in the form of half wave using a half-wave rectifier inside diode (821) connected to phase L opposite the neutral line, that is, to terminal No. 2 of the inner terminal strip (813) of the inner machine (812), and then transmitted to a interior photo-coupler (823) zero crossing.

As a result, the phototransistor of the interior photo-coupler (823) zero crossing works in CONNECTION /
DISCONNECTION This operation signal in CONNECTION / DISCONNECTION is delivered as input to the zero crossing input port of the internal microcomputer (834), whereby the internal microcomputer controls the operation of the internal machine based on this signal.

Incidentally, the current that has passed to through the inner photo coupler photodiode (823) zero crossing returns to phase N of the neutral line of Electric power supply in AC (802), that is, at terminal N of the internal terminal strip (813) of the inner machine (812). The above is the structure and the operation of the zero crossing circuit.

Next, the inner microcomputer (834) that has received the serial signal through operation described above of the zero crossing circuit starts a serial communication

That is, the inner microcomputer (834) transmits a serial signal from its transmission port to a internal transmission transistor (832), to activate the transistor (832). The photo coupler photodiode (831) of internal transmission connected to this transistor (832) of indoor transmission is set to ON / OFF, and by consequently its phototransistor is set to ON / OFF.

Then, based on the operation of CONNECTION / DISCONNECTION of this phototransistor, the power supply supplied from phase N of the neutral line of the source of electric power supply in c.a. (802) is rectified in half wave using a half wave rectifier diode (824) to internal communication, and is limited by an internal resistance (825) series current limiter up to an intensity level of current that does not damage the photo coupler (831) internal transmission or a photo coupler (833) of interior reception. After the above, a diode Zener interior (826) converts power supply in an electric power supply in c.c. not isolated

Then, based on the CONNECTION / DISCONNECTION of the photo coupler (831) of internal transmission, voltage and current intensity of the electric power supply in c.c. converted constitute in a serial signal that is a communication signal between indoor and outdoor machines. This serial signal is transmitted to a diode (829) of internal communication through the photo-coupler (833) of interior reception, and thereafter, to a terminal No. 3 of the inner strip of terminals (813) connected to a terminal No. 3 of the external terminal block of terminals (803), by means of a PTC thermistor (830).

Then the transmitted serial signal from the inner terminal strip (813) to terminal No. 3 of the outer terminal strip (803) is also transmitted to a external resistance (808) current intensity limiting a through an external diode (807). The intensity of the current of the serial signal is then limited, and then the serial signal is transmits to a photo-coupler (810) transmission outside through the photo coupler (806) of outside reception.

As a result, the photodiode and the phototransistor of the receiving photo-coupler (806) for External communication are put on CONNECTION / DISCONNECT, so the ON / OFF signal is input as input to the reception port of the external microcomputer (805). He external microcomputer (805) analyzes this signal, and generates a control signal based on a result of this analysis with the in order to control the operation of the outdoor machine (801). To the same time, the control content is transmitted as a signal in series from its transmission port to photo-coupler (810) of external transmission to through an external transmission transistor (809).

Therefore, the serial signal from the Transistor (809) for external transmission and serial signal received from the receiving photo-coupler (806) exterior are combined and overlap together by the outdoor transmission photo-coupler (810) connected to phase L.

Then the superimposed serial signal is transmits from the photo coupler (810) of external transmission to terminal No. 2 of the external power strip of terminals (803), and then to terminal No. 2 of the inner strip of terminals (813) through an indoor / outdoor connection line (811). Therefore, the serial signal is transmitted to the side "less" of the DC power supply on the Zener diode interior (826) connected to terminal No. 2 of the internal terminal strip of terminals (813).

As a result, a grounding of reference of the serial communication circuit which is the side "minus" of an electrolytic inner capacitor (827) of Zener voltage stabilization is also put in CONNECTION / DISCONNECTION by the serial signal of CONNECTION / DISCONNECTION of the external machine (801). Therefore, the phototransistor of photo-coupler (833) of internal transmission gets in CONNECTION / DISCONNECTION, and the photodiode connected to the phototransistor it is also set to CONNECT / DISCONNECT

Then, based on the CONNECTION / DISCONNECTION of this photodiode, the receiving port of the Inner microcomputer (834) is set to High / Low, bringing the Inner microcomputer (834) receives and analyzes the serial signal from The outer machine. In this way, a new signal is transmitted in series from the transmission port of the internal microcomputer (834).

Based on the circulation above described of the serial signal, a communication is established in series between the outer machine (801) and the inner machine (812).

As explained above, the power supply for the zero crossing circuit it is taken from phase L opposite to phase N of the source of AC power, and electric power supply for the Serial communication circuit is taken from phase N of the line of neutral of the AC power supply. Therefore, the respective component currents of c.c. do not add together, and these currents circulate to the respective phases of the source of AC power, so that it can be obtained as result a very reliable control circuit for a conditioner of split type air that prevents the appearance of a failure of operation of each machine caused by the harmonics of higher frequencies

Fifth realization

A structure is explained below and the operation of a fifth embodiment with reference to a flow chart of Figure 11.

The fifth embodiment is constituted of such so that, in relation to the change since the operation of the zero crossing circuit to the operation of the circuit serial communication of the third or fourth embodiment, it judge whether the inside machine has worked or not normally in the zero crossing circuit operation during a period of default time If the indoor machine has worked Normally, the operation changes from the zero crossing circuit to the serial communication circuit.

First, as shown in the diagram of flow, the inner machine and the machine are installed and connected outside of the air conditioner. Once you have connected the AC power supply (702), a power switch is pressed Functional test of the indoor machine or is controlled to operating distance, that is, a signal is transmitted (703) of connection. When (704) three minutes have elapsed since then, an internal microcomputer considers whether the state of indoor machine operation is normal or abnormal (705).

Then when the result of the consideration is an abnormal state (NO), the inner microcomputer instructs to visually present the abnormal state, stop in the abnormal state (actuator), and start counting a time of new start-up (three minutes, for example), in such a way that the visual presentation of abnormality be carried out, the Abnormal stop (actuator) and time count (710). After three minutes, the procedure returns to stage (705). He internal microcomputer reconsiders whether the state of Indoor machine operation is normal or abnormal. When a result is NO, the same operation is repeated.

Additionally, when the status of indoor machine operation is normal (YES) in the stage (705), the inner microcomputer instructs the circuit of serial communication to start transmitting a serial signal (706) such that the internal communication circuit in serial transmits the serial signal to the indoor machine and to the external machine respectively by means of a connection line interior Exterior.

Next, an outer microcomputer Consider whether the operating status of the outdoor machine is normal or abnormal after receiving this signal in series (707). When the operating state is abnormal (NO), the outer microcomputer transmits an abnormal serial signal that represents this abnormal state to the external communication circuit serially. Then, the serial external communication circuit transmits the abnormal serial signal to the internal microcomputer to through the internal serial communication circuit (709).

Next, the inner microcomputer that has received the abnormal serial signal (709) issues an instruction to visually present the abnormal state, stop at the state abnormal (actuator), and start counting for three minutes (710). After three minutes (711), the procedure returns to the stage (705). The inner microcomputer then considers whether the state of Indoor machine operation is normal or abnormal. When a result is NO, a similar operation is repeated.

\hbox{(c.c.) se genera
solamente en el circuito de cruce por cero.}

When the operating state of the outdoor machine is normal (YES), in the previous step 707, the outer microcomputer transmits its contents to the inner microcomputer through the inner / outer connection line, and the inner microcomputer, having received the content , transmits a serial signal representing the latest operating status information from the indoor machine to the outdoor machine. Therefore, both machines can continue in operation confirming each one the state of operation of the other. At the same time, the serial communication is initiated after a predetermined time since a remote control or similar device issues the CONNECTED operating instruction. Therefore, at the start-up time during the first three minutes, the component DC

 \ hbox {(cc) is generated
only in the zero crossing circuit.} 

As explained above, agree with this invention, at the time of switching from operation with zero crossing circuit to operation with circuit serial communication, a consideration is made in the sense of if the indoor machine in the operating state of the circuit zero crossing is working normally or not during the period Default time. When the operation is normal, the Operation changes to the serial communication circuit. By therefore, a direct current component is not generated (c.c.) during the predetermined period of time (three minutes, for example) after the power supply has started electric in order to prevent waste of energy electric As a result, it is possible to obtain a control circuit economical and very reliable that you can communicate safely, for a split type air conditioner.

Claims (5)

1. A control circuit for a conditioner of air of the divided type consisting of an outdoor machine (1) and an inner machine (2) connected to each other by means of a line power supply and a line of communication, in which the control circuit comprises a photo-coupler (23) transmission, a receiving photo-coupler (24) and a controller (22), arranged in a machine communication circuit interior (2); in which the photo coupler (23) of transmission and photo-coupler (24) of reception they are connected together in series; Y in which the photo coupler (23) of transmission and photo-coupler (24) of reception are connected respectively to the controller (22), characterized because the photo coupler (24) of reception is connected in series to a protection subcircuit against overcurrent that includes a diode rectifier (24c) and a power cut-off device (24d, 29) to cut a circuit current in response to a current overcurrent that is greater than a value of default current intensity. 2. The control circuit according to the claim 1, characterized because a phototransistor (23c) of photo-coupler (23) transmission and a photodiode (24b) of the receiving photo coupler (24) are connected together in series; a photodiode (23b) of photo-coupler (23) transmission and a phototransmitter (24a) of the photo coupler (24) of reception are connected respectively to the controller (22); Y the photodiode (24b) of receiving photo-coupler (24) is connected in series to a rectifier diode (24c) of the protection subcircuit against overcurrent to cut a current from the circuit in response to a current overcurrent that is greater than a predetermined current intensity value. 3. The control circuit according to the claims 1 or 2, characterized in that it further comprises a second rectifier diode (27) connected in series with a Zener voltage stabilization electrolytic capacitor (26) in which both components are connected in parallel with the phototransistor (23c) and the photodiode (24b) connected together in series, and also to the power cut-off device (24d, 29) in the current overcurrent protection subcircuit. 4. The control circuit according to any one of claims 1 to 3, characterized in that the current cutting device is a PTC thermistor (24d). 5. The control circuit according to any one of claims 1 to 3, characterized in that the current cutting device is a fuse (29).