CN114992806B

CN114992806B - Zero-live wire line sequence conditioning device of air conditioner and control method thereof

Info

Publication number: CN114992806B
Application number: CN202210661760.1A
Authority: CN
Inventors: 梁尚; 宋爱
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-06-13
Filing date: 2022-06-13
Publication date: 2023-06-30
Anticipated expiration: 2042-06-13
Also published as: CN114992806A

Abstract

The invention discloses a zero-live wire line sequence conditioning device of an air conditioner and a control method thereof, wherein the device comprises the following components: the internal machine zero line reverse connection identification and alignment unit is used for identifying the zero line in the first power line of the internal machine and the second power line of the internal machine and connecting the identified zero line with the internal machine communication module; the internal and external machine line sequence identification auxiliary unit is used for connecting a power supply line where the identified zero line is positioned with a connecting line between corresponding external machine power supply lines in the external machine first power supply line and the external machine second power supply line after the identified zero line is connected into the communication current loop; and the external machine line sequence identification and alignment unit is used for identifying the current flow directions of the first power line of the external machine and the second power line of the external machine after the power supply line of the internal machine for supplying power to the external machine is connected, and selecting a connecting line between the corresponding zero-live wire communication power supply and the external machine communication module for connection. According to the scheme, the zero and fire wires between the internal machine and the commercial power and between the internal machine and the external machine are not required to be distinguished, so that the assembly difficulty of the zero and fire wires is reduced.

Description

Zero-live wire line sequence conditioning device of air conditioner and control method thereof

Technical Field

The invention belongs to the technical field of air conditioners, in particular relates to a zero-live wire line sequence conditioning device of an air conditioner and a control method thereof, and particularly relates to an internal and external zero-live wire line sequence self conditioning circuit for an air conditioner and a control method thereof.

Background

Most of the air conditioners consist of an indoor unit and an outdoor unit. The indoor unit and the outdoor unit need to communicate with each other to realize complex functions. For example, the inverter air conditioner needs to change the operating frequency of the compressor of the outdoor unit according to different working conditions, which requires frequent communication between the indoor unit and the outdoor unit. In practice, however, the indoor unit and the outdoor unit of the air conditioner are far apart from each other, and there are many interferences, which affect the reliability of the communication between the indoor unit and the outdoor unit. In order to ensure the reliability of communication between the air conditioner indoor unit (i.e. the indoor unit) and the air conditioner outdoor unit (i.e. the outdoor unit), the communication mode between the indoor unit and the outdoor unit usually adopts a three-wire system, i.e. the connecting wire between the indoor unit and the outdoor unit comprises a zero wire, a fire wire and a communication wire, thereby forming half-duplex asynchronous serial port communication, and the communication is safe and reliable and has low cost.

In general, an air conditioner indoor unit inputs 220V alternating current AC, but there are cases where the indoor unit zero line (i.e., zero line and line) is connected reversely due to accident or error. Although the zero fire wire of the indoor unit is connected reversely, the integrity of a communication loop and the voltage of a communication power supply are not affected, the voltage between the communication wire and the zero wire is too high, the electrical risk exists when the voltage exceeds the insulation voltage limit, and the PCB is broken down easily, so that a certain risk is generated.

The outdoor unit is usually powered by the indoor unit, but the outdoor unit is connected with the zero line and the fire line in reverse during the installation process. Once the zero and live wires of the outdoor unit are connected reversely, a communication circuit between the outdoor unit and the indoor unit cannot form a current loop (namely a communication loop), so that communication faults are caused, and the air conditioner cannot be started normally. The fault is required to be checked, the position of the zero line and the fire line is required to be manually exchanged, so that the installation efficiency is limited, and high-altitude operation is required during reinstallation, so that the operation risk of an installer is increased.

The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.

Disclosure of Invention

The invention aims to provide a zero-live wire line sequence conditioning device of an air conditioner and a control method thereof, which aim to solve the problems that the electrical risk exists due to the fact that the voltage between a communication wire and a zero wire is too high when the zero-live wire between an air conditioner indoor unit and a commercial power is reversely connected, the communication faults of the air conditioner indoor unit and the air conditioner indoor unit cannot work due to the fact that the zero-live wire between the air conditioner indoor unit and the commercial power and the zero-live wire between the air conditioner indoor unit and the air conditioner indoor unit are large in assembly difficulty and the risk of damaging the air conditioner due to the fact that the zero-live wire between the air conditioner indoor unit and the commercial power is assembled in an assembly error mode, and the air conditioner indoor unit are damaged due to the fact that the zero-live wire sequence of the indoor unit is detected and conditioned after the indoor unit is powered on, and the zero-live wire sequence of the air conditioner indoor unit and the commercial power is detected and conditioned after the outdoor unit is powered on, so that the zero-live wire between the air conditioner indoor unit and the commercial power and the air conditioner indoor unit are not required to be distinguished from each other.

The invention provides a zero-live wire line sequence conditioning device of an air conditioner, which is provided with an inner machine and an outer machine; an internal machine communication module is arranged on the internal machine side; an external machine communication module is arranged on the external machine side; the power cord of interior machine includes: the first power line of the internal machine and the second power line of the internal machine; the power cord of outer machine includes: the external machine first power line and the external machine second power line; the external machine is provided with a first zero-live wire communication power supply and a second zero-live wire communication power supply; the communication current loop can be formed by connecting a power line with a communication line between the outer machine communication module and the inner machine communication module; zero live wire line preface of air conditioner is prepared device includes: an inner machine zero-live wire reverse connection identification and alignment unit, an inner machine line sequence identification auxiliary unit and an outer machine line sequence identification and alignment unit; the internal machine zero-live wire reverse connection identification and adjustment unit is configured to identify zero wires in the internal machine first power wire and the internal machine second power wire, and enable connection wires between the zero wires in the internal machine first power wire and the internal machine second power wire and the internal machine communication module to be connected, so that the zero wires in the internal machine first power wire and the internal machine second power wire are connected into the communication current loop; the internal and external machine line sequence identification auxiliary unit is configured to connect a power supply line where a zero line in the internal machine first power supply line and the internal machine second power supply line is located with a power supply line where the zero line in the internal machine first power supply line and the internal machine second power supply line is located with a corresponding external machine power supply line in the external machine first power supply line and the external machine second power supply line under the condition that the zero line in the internal machine first power supply line and the internal machine second power supply line is connected into the communication current loop, so as to connect the power supply line where the internal machine supplies power to the external machine; the external machine line sequence identification and alignment unit is configured to identify current flow directions of a first power line of the external machine and a second power line of the external machine under the condition that a power supply line for supplying power to the external machine by the internal machine is connected, select connection lines between corresponding zero-live wire communication power supplies in the first zero-live wire communication power supply and the second zero-live wire communication power supply and the external machine communication module to be connected, and connect the corresponding zero-live wire communication power supplies in the first zero-live wire communication power supply and the second zero-live wire communication power supply into the communication current loop.

In some embodiments, the internal machine zero line reverse connection identifying and aligning unit includes: a zero line detection module and a zero line selection module; the device comprises an inner machine zero-live wire reverse connection identification and alignment unit, an inner machine first power line and a zero line in an inner machine second power line are identified, and a connecting line between the inner machine first power line and the zero line in the inner machine second power line and the inner machine communication module is connected, and the device comprises: the zero line detection module is configured to identify a zero line in the first power line of the internal machine and the second power line of the internal machine; the zero line selection module is configured to enable a connecting line between the zero line in the first power line of the internal machine and the second power line of the internal machine and the internal machine communication module to be connected based on the identified zero line in the first power line of the internal machine and the second power line of the internal machine.

In some embodiments, the neutral detection module comprises: the device comprises a first switch module, a current limiting module, a bidirectional diode module, a capacitor module and a signal acquisition and processing module; any one of the first power line of the internal machine and the second power line of the internal machine is used as an internal machine detection line; the internal machine detection is connected to the first end of the bidirectional diode module and the first end of the capacitor module after passing through the first switch module and the current limiting module, and is connected to the first end of the signal acquisition processing module; the second end of the bidirectional diode module and the second end of the capacitor module are connected to the second end of the signal acquisition processing module; the second end of the bidirectional diode module is also connected with a shell; the third end of the signal acquisition processing module is used as an output end and is used for outputting a zero line detection result to a controller of the air conditioner; the fourth end of the signal acquisition processing module is connected with a direct current power supply; in the bidirectional diode module, the anode of the first diode is connected with the cathode of the second diode, and the cathode of the first diode is connected with the anode of the second diode; the signal acquisition processing module adopts a differential amplifying circuit; and under the condition that the first switch module is closed, the signal acquisition processing module outputs a zero line detection result that the internal machine detection line is a live line or a zero line.

In some embodiments, the neutral selection module comprises: a first zero line selection branch and a second zero line selection branch; the first power line of the inner machine is connected to the inner machine communication module after passing through the first zero line selection branch, and the second power line of the inner machine is connected to the inner machine communication module after passing through the second zero line selection branch; the first zero line selection branch circuit and the second zero line selection branch circuit have the same structure; the first zero line selection branch circuit comprises: the first diode module, the first protection module and the second switch module; the first power line of the internal machine is connected to the cathode of the diode module; the anode of the first diode module is connected to the internal machine communication module after passing through the first protection module and the second switch module; and when the second switch module is closed, the first power line of the internal machine is connected to the internal machine communication module.

In some embodiments, the internal and external line-sequence identification auxiliary unit includes: a first auxiliary branch and a second auxiliary branch; the first power line of the internal machine is connected to a first output line through the first auxiliary branch, and the second power line of the internal machine is connected to a second output line through the second auxiliary branch; the first output line can be connected with one external machine power line of the external machine first power line and the external machine second power line; the second output line can be connected with the other external machine power line in the external machine first power line and the external machine second power line; the first auxiliary branch and the second auxiliary branch have the same structure; the first auxiliary branch comprises: a second diode module and a third switch module; the second diode module is connected with the third switch module in parallel; the first power line of the internal machine is connected to the anode of the second diode module; a cathode of the second diode module connected to the first output line; under the condition that the third switch module is closed, a connecting line between the first power line of the inner machine and the first output line is connected, so that a connecting line between the first power line of the inner machine and an outer machine power line connected with the first output line in the first power line of the outer machine and the second power line of the outer machine is connected.

In some embodiments, the external machine line sequence identification and alignment unit includes: the current flow direction detection module and the zero fire wire power supply switching module; the external machine line sequence recognition and alignment unit recognizes the current flow direction of the first power line of the external machine and the second power line of the external machine, selects the first zero fire wire communication power supply and the corresponding zero fire wire communication power supply in the second zero fire wire communication power supply to be communicated with a connecting line between the external machine communication modules, and comprises: the current flow direction detection module is configured to identify the current flow direction of the external machine first power line and the external machine second power line; the zero-live wire power supply switching module is configured to select a connecting wire between a corresponding zero-live wire communication power supply of the first zero-live wire communication power supply and the second zero-live wire communication power supply and the external machine communication module to be connected based on the recognized current flow directions of the first power supply wire of the external machine and the second power supply wire of the external machine.

In some embodiments, the current flow detection module comprises: the first resistor module, the second resistor module, the third resistor module, the fourth resistor module, the fifth resistor module and the sixth resistor module, the first electrolytic capacitor module and the second electrolytic capacitor module; the first output terminal of the current flow direction detection structure is a collector electrode of the transistor side of the first optocoupler module; a second output terminal of the current flow direction detection structure is a collector electrode of the transistor side of the second optocoupler module; the direct current power supply is connected to a collector electrode of a transistor side of the first optical coupler module after passing through the first resistor module, the diode side of the first optical coupler module is connected with the first electrolytic capacitor module and the fourth resistor module in parallel, an anode of the diode side of the first optical coupler module is connected with an anode of the first electrolytic capacitor module and a cathode of the third diode module, and a cathode of the first electrolytic capacitor module is connected with the second power line of the external machine after passing through the sixth resistor module; the direct current power supply is further connected to a collector electrode of the transistor side of the second optocoupler module after passing through the third resistor module, the diode side of the second optocoupler module is connected with the second electrolytic capacitor module and the fifth resistor module in parallel, a cathode of the diode side of the second optocoupler module is connected with a cathode of the second electrolytic capacitor module and an anode of the fourth diode module, and an anode of the second electrolytic capacitor module is connected with a second power line of the external machine after passing through the sixth resistor module.

In some embodiments, the zero line power switching module includes: a first identification branch and a second identification branch; the first power line of the external machine is connected to the external machine communication module after passing through the first zero-live wire communication power supply and the first identification branch; the second power line of the external machine is connected to the external machine communication module after passing through the second zero-live wire communication power supply and the second identification branch; the first identification branch and the second identification branch have the same structure; the first identification branch comprises: the second protection module, the fifth diode module and the fourth switch module; the first power line of the external machine is connected with the anode of the fifth diode module after passing through the first zero-live wire communication power supply and the second protection module; and the cathode of the fifth diode module is connected to the external communication module after passing through the fourth switch module.

In some embodiments, the first and second neutral communication power supplies are identical in structure; the first zero live wire communication power supply comprises: the voltage stabilizing module, the third electrolytic capacitor module and the sixth diode module; the external machine first power line is respectively connected to the anode of the voltage stabilizing module and the cathode of the third electrolytic capacitor module; the cathode of the voltage stabilizing module is connected to the anode of the sixth diode module; and the cathode of the sixth diode module is connected with the anode of the third electrolytic capacitor module and is connected to the zero-live wire power supply switching module.

In accordance with another aspect of the present invention, in response to the foregoing apparatus, a control method for a zero/live line sequence conditioning apparatus of an air conditioner is provided, including: the method comprises the steps of controlling an inner machine zero-live wire reverse connection identification and alignment unit, identifying zero wires in a first inner machine power wire and a second inner machine power wire, and enabling a connecting wire between the zero wires in the first inner machine power wire and the second inner machine power wire and the inner machine communication module to be connected so as to enable the zero wires in the first inner machine power wire and the second inner machine power wire to be connected into the communication current loop; the method comprises the steps of controlling an inner machine line sequence identification auxiliary unit, and connecting a power supply line where a zero line in an inner machine first power line and the zero line in an inner machine second power line is positioned with a corresponding outer machine power supply line in an outer machine first power line and the outer machine second power line under the condition that the zero line in the inner machine first power line and the inner machine second power line is connected into the communication current loop, so as to connect the power supply line where the inner machine supplies power to the outer machine; the method comprises the steps of controlling an external machine line sequence identification and alignment unit, identifying the current flow directions of a first power line of the external machine and a second power line of the external machine under the condition of connecting a power supply line of an internal machine for supplying power to the external machine, selecting a connecting line between a corresponding zero-live wire communication power supply in the first zero-live wire communication power supply and the second zero-live wire communication power supply and an external machine communication module, and connecting the corresponding zero-live wire communication power supplies in the first zero-live wire communication power supply and the second zero-live wire communication power supply into a communication current loop.

Therefore, according to the scheme of the invention, the indoor unit is provided with the zero line detection circuit and the zero line selection switch, the zero line detection circuit is used for detecting the zero line and the fire line of the indoor unit after the indoor unit is electrified, and the zero line and the fire line communication module is communicated through the zero line selection switch; an inner and outer machine line sequence detection module is arranged between an indoor machine and an outdoor machine, a current flow direction detection circuit and a zero and fire wire power supply switching circuit are arranged on the outdoor machine side, under the condition that an indoor machine zero line is connected with a zero and fire wire communication module, the current flow direction is controlled to start, the zero and fire wire communication module on the outdoor machine side is detected, and the zero and fire wire power supply switching circuit is connected with the zero and fire wire communication module on the outdoor machine side according to a detection result, so that the indoor machine zero and fire wire is detected and regulated after the indoor machine is electrified, and then the inner and outer machine zero and fire wire line sequence is detected and regulated after the outdoor machine is electrified, so that the zero and fire wire between the air conditioning indoor machine and the commercial power and the air conditioning indoor and the air conditioning are installed without distinguishing, the assembly difficulty of the zero and fire wire between the air conditioning indoor machine and the commercial power and the air conditioning indoor machine is greatly reduced, and the risk that the zero and fire wire between the air conditioning indoor machine and the air conditioning is assembled in an incorrect state is avoided.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

The technical scheme of the invention is further described in detail through the drawings and the embodiments.

Drawings

FIG. 1 is a schematic diagram of an embodiment of a filtering and rectifying circuit for an indoor and outdoor unit strong current power supply of an air conditioner according to a related scheme;

FIG. 2 is a schematic diagram of an embodiment of a three-wire communication circuit for an indoor unit and an outdoor unit of an air conditioner according to the related art;

FIG. 3 is a schematic diagram of an embodiment of a conditioning apparatus for conditioning zero and hot wire sequences of an air conditioner according to the present invention;

FIG. 4 is a schematic diagram of an embodiment of a user utility service connection circuit in a related scheme;

FIG. 5 is a schematic diagram illustrating an embodiment of a zero line detection circuit in a related scheme;

FIG. 6 is a schematic diagram of a zero line identification circuit according to the present invention;

fig. 7 is a schematic structural diagram of a reverse connection communication circuit between an inner unit and an outer unit of an air conditioner according to a related scheme, in which (a) is a schematic structural diagram of a first embodiment of the reverse connection communication circuit between the inner unit and the outer unit of the air conditioner, (b) is a schematic structural diagram of a second embodiment of the reverse connection communication circuit between the inner unit and the outer unit of the air conditioner, and (c) is a schematic structural diagram of a third embodiment of the reverse connection communication circuit between the inner unit and the outer unit of the air conditioner;

Fig. 8 is a schematic structural diagram of an embodiment of an indoor unit system of an air conditioner in a related aspect;

fig. 9 is a schematic structural diagram of an embodiment of an outdoor unit system of an air conditioner according to the related art;

FIG. 10 is a schematic diagram illustrating an embodiment of a line-sequential identification and alignment system of an indoor unit of an air conditioner according to the present invention;

FIG. 11 is a schematic diagram (innovative circuit) illustrating an embodiment of an outdoor unit system of an air conditioner according to the present invention;

fig. 12 is a schematic structural diagram of an internal and external wiring equivalent circuit according to the present invention, in which (a) is a schematic structural diagram of a first embodiment of the internal and external wiring equivalent circuit, (b) is a schematic structural diagram of a second embodiment of the internal and external wiring equivalent circuit, (c) is a schematic structural diagram of a third embodiment of the internal and external wiring equivalent circuit, and (d) is a schematic structural diagram of a fourth embodiment of the internal and external wiring equivalent circuit;

FIG. 13 is a diagram of an external time-current curve according to the present invention, wherein (a) is a diagram of a first embodiment of the external time-current curve, (b) is a diagram of a second embodiment of the external time-current curve, and (c) is a diagram of a third embodiment of the external time-current curve;

FIG. 14 is a schematic diagram illustrating an embodiment of a current flow detection circuit according to the present invention;

FIG. 15 is a schematic diagram of an embodiment of a zero line communication self-regulating circuit for an air conditioner according to the present invention;

FIG. 16 is a flow chart of an embodiment of a control method of a zero line sequence conditioning device of an air conditioner according to the present invention;

fig. 17 is a schematic general structural diagram of a conditioning apparatus for a zero-line wire sequence of an air conditioner according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Fig. 1 is a schematic structural diagram of an embodiment of a filtering and rectifying circuit for an indoor and outdoor unit strong electric power supply of an air conditioner according to a related scheme. As shown in fig. 1, after the zero line (i.e., zero line N and live line L) of the air conditioner indoor and outdoor unit is connected, the air conditioner indoor and outdoor unit is protected and filtered by a protection circuit and a filter circuit, full-wave rectified by a rectifier bridge, filtered by a high-capacity electrolytic capacitor to form stable direct current, and then voltage with different requirements is provided for the air conditioner outdoor unit by a switching power supply. The high-capacity electrolytic capacitor is grounded GND.

In the example shown in fig. 1, in the filtering and rectifying circuit of the strong electric power source of the indoor unit and the outdoor unit of the air conditioner, the power source part of the outdoor unit of the air conditioner is an AC-DC converter, and the AC power is not directly supplied to the high-power device of the outdoor unit of the air conditioner. And the controller power supply, the cooling fan and the like in the air conditioner internal and external units all need direct current power supply. The alternating current only supplies power for the zero-live wire communication module. Besides special requirements of the communication function on connection of the zero line and the fire line, the connection of the zero line and the fire line has no influence on operation of other functions.

As can be seen from the example shown in fig. 1, the connection and disconnection of the zero line between the indoor unit and the outdoor unit of the air conditioner have no influence on the operation of other functions, except that the communication function has special requirements on the connection of the zero line. Therefore, based on the principle, the normal and safe operation of communication can be ensured by only changing the zero-live wire sequence of the access communication part.

Fig. 2 is a schematic structural diagram of an embodiment of a three-wire system zero-fire wire communication circuit of an air conditioner indoor unit according to the related scheme. As shown in fig. 2, in the three-wire zero-line communication circuit of the air conditioner internal and external units, the internal and external units form a communication current loop through a zero line N and a communication line COM, the current limiting function of a resistor in the communication current loop, the unidirectional conductivity of a diode and the voltage clamping function of a zener diode provide protection for an optocoupler in the communication current loop, ensure the stable operation of communication, and the outdoor unit provides power for zero-line communication. In the example shown in fig. 2, the neutral communication power supply is powered by a neutral voltage divider.

In general, an air conditioner indoor unit inputs 220V alternating current AC, but there are cases where the zero line of the indoor unit is connected reversely due to accidents or error reasons. Although the zero line of the indoor unit is connected reversely, the integrity of the communication current loop and the voltage of the communication power supply are not affected, the voltage between the communication line COM and the zero line N is as high as ut=311v+u, the electrical risk is easily caused when the voltage exceeds the insulation voltage limit, and the PCB is easily broken down. Therefore, the zero fire wire connection between the indoor unit of the air conditioner and the commercial power is reversed, so that the voltage between the communication wire and the zero wire is too high, the PCB is easy to break down, and the electrical risk exists when the insulation voltage limit is exceeded easily.

As can be seen from the example shown in fig. 2, the correct connection of the zero line and the hot line of the air-conditioning zero line communication module is ensured. The air conditioner zero fire communication module zero fire wire comprises a zero fire wire between an indoor unit and an outdoor unit and a zero fire wire between an indoor unit and commercial power.

Some schemes provide an automatic zero-live wire communication aligning circuit and a control method thereof, and the detection control method is safe and reliable, but all the switches used in the automatic zero-live wire communication aligning circuit are normally open switches, and the normally open switches have large rated current, high cost and large switch volume. In addition, the normally open switch is in an off state after being electrified and can not provide voltage for a circuit at the back, so that a switch driving power supply is required to be additionally designed, and the switch is set to be turned on and off in a delayed manner through a program so as to avoid the short circuit of a zero fire wire, thereby realizing the short circuit protection. And the zero and live wire line sequence is fixed after the outdoor unit is installed, and is not changed any more, and a dead zone formed by delay of a switch is not required to be arranged. In addition, the zero live wire detection circuit has a certain electrical risk and leakage current risk.

In consideration, the reversal of the zero-live wire connection between the indoor unit and the mains supply can lead to the electrical safety problem of local excessive voltage of the communication module. The problem that communication failure is caused by the reverse connection of the zero line between the indoor unit and the outdoor unit is also existed. Therefore, the scheme of the invention provides an internal and external zero-live wire line sequence self-regulating circuit for an air conditioner and a control method thereof.

According to the embodiment of the invention, a zero-live line sequence conditioning device of an air conditioner is provided. Referring to fig. 3, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The air conditioner is provided with an inner machine and an outer machine. And an internal machine communication module (namely an internal machine zero and fire wire communication module) is arranged on the internal machine side, namely the zero and fire wire communication module in the air conditioner internal machine system. And an external machine communication module (namely an external machine zero and fire wire communication module) is arranged on the external machine side, namely the zero and fire wire communication module in the air conditioner external machine system. The power cord of interior machine includes: the power supply system comprises an inner machine first power line and an inner machine second power line, wherein one inner machine power line in the inner machine first power line and one inner machine power line in the inner machine second power line is a live line, and the other inner machine power line is a zero line. The power cord of outer machine includes: the external machine first power line and the external machine second power line, wherein one external machine power line in the external machine first power line and the external machine second power line is a live line, and the other external machine power line is a zero line. The first power line of the inner machine can be connected to one of the first power line of the outer machine and the second power line of the outer machine, and the second power line of the inner machine can be connected to the other of the first power line of the outer machine and the second power line of the outer machine. The external machine is provided with a first zero-live wire communication power supply and a second zero-live wire communication power supply. The positive pole of the zero-live wire communication power supply is connected to the first power line of the external machine, and the negative pole of the zero-live wire communication power supply is connected to the second power line of the external machine. The communication current loop can be formed by connecting the power line and the communication line between the outer machine communication module and the inner machine communication module.

Zero live wire line preface of air conditioner is prepared device includes: the system comprises an inner machine zero-live wire reverse connection identification and alignment unit, an inner machine line sequence identification auxiliary unit and an outer machine line sequence identification and alignment unit. And the internal machine zero and fire wire reverse connection identification and alignment unit is an internal machine zero and fire wire reverse connection identification and alignment circuit as shown in fig. 10. An internal and external line sequence identification auxiliary unit, such as the internal and external line sequence identification auxiliary circuit shown in fig. 10. An external machine line sequence identification and alignment unit, such as the external machine line sequence identification and alignment circuit shown in fig. 11. The first power line of the inner machine and the second power line of the inner machine are respectively connected with the inner machine zero-live wire reverse connection identification and alignment unit and the inner machine line sequence identification auxiliary unit. The first output line and the second output line of the internal and external machine line sequence identification auxiliary unit can be correspondingly connected with the external machine first power line and the external machine second power line. The external machine first power line and the external machine second power line are connected with the external machine line sequence identification and alignment unit. The inner machine zero and live wire reverse connection identification and alignment unit and the outer machine line sequence identification and alignment unit are connected through a communication line.

The internal machine zero-live wire reverse connection identification and adjustment unit is configured to identify zero wires in the internal machine first power wire and the internal machine second power wire, and enable connection wires between the zero wires in the internal machine first power wire and the internal machine second power wire and the internal machine communication module to be connected, so that the zero wires in the internal machine first power wire and the internal machine second power wire are connected into the communication current loop.

The internal and external machine line sequence identification auxiliary unit is configured to connect a power supply line where a zero line in the internal machine first power supply line and the internal machine second power supply line is located with a power supply line where the zero line in the internal machine first power supply line and the internal machine second power supply line is located with a corresponding external machine power supply line in the external machine first power supply line and the external machine second power supply line under the condition that the zero line in the internal machine first power supply line and the internal machine second power supply line is connected into the communication current loop, so as to connect the power supply line where the internal machine supplies power to the external machine. The first output line and the second output line of the internal and external machine line sequence identification auxiliary unit can be correspondingly connected with the external machine first power line and the external machine second power line. Therefore, the power supply circuit where the zero line in the first power line of the inner machine and the second power line of the inner machine is, via the corresponding output lines in the first output line and the second output line of the inner machine line sequence identification auxiliary unit, connected with the corresponding outer power line in the corresponding connection of the first power line of the outer machine and the second power line of the outer machine.

The external machine line sequence identification and alignment unit is configured to identify current flow directions of a first power line of the external machine and a second power line of the external machine under the condition that a power supply line for supplying power to the external machine by the internal machine is connected, select connection lines between corresponding zero-live wire communication power supplies in the first zero-live wire communication power supply and the second zero-live wire communication power supply and the external machine communication module to be connected, and connect the corresponding zero-live wire communication power supplies in the first zero-live wire communication power supply and the second zero-live wire communication power supply into the communication current loop.

According to the scheme, the zero-live wire line sequence self-regulating circuit for the air conditioner and the control method thereof, the air conditioner indoor unit is not required to be distinguished from the mains supply and the zero-live wires between the air conditioner indoor unit and the air conditioner indoor unit, the installation difficulty is reduced, the problem caused by reverse connection of the zero-live wires is solved, and the installation efficiency is improved. And moreover, the zero firing line is identified by using a unique circuit structure, so that the electrical risk and the electric leakage problem can be effectively reduced, the safety performance is improved, and the use cost of additional devices can be reduced.

In some embodiments, the internal machine zero line reverse connection identifying and aligning unit includes: the system comprises a zero line detection module, a zero line selection module and a zero line selection module, wherein the zero line detection module is a zero line detection circuit, and the zero line selection module is a zero line selection switch circuit. The zero line detection module and the zero line selection module are sequentially connected to the internal machine communication module. And the zero line detection module, the zero line selection module and the internal machine communication module are respectively connected with the MCU.

The device comprises an inner machine zero-live wire reverse connection identification and alignment unit, an inner machine first power line and a zero line in an inner machine second power line are identified, and a connecting line between the inner machine first power line and the zero line in the inner machine second power line and the inner machine communication module is connected, and the device comprises:

The zero line detection module is configured to identify a zero line in the first power line of the internal machine and the second power line of the internal machine.

The zero line selection module is configured to enable a connecting line between the zero line in the first power line of the internal machine and the second power line of the internal machine and the internal machine communication module to be connected based on the identified zero line in the first power line of the internal machine and the second power line of the internal machine.

Fig. 7 is a schematic structural diagram of a reverse connection communication circuit between an inner unit and an outer unit of an air conditioner according to a related scheme, in which (a) is a schematic structural diagram of a first embodiment of the reverse connection communication circuit between the inner unit and the outer unit of the air conditioner, (b) is a schematic structural diagram of a second embodiment of the reverse connection communication circuit between the inner unit and the outer unit of the air conditioner, and (c) is a schematic structural diagram of a third embodiment of the reverse connection communication circuit between the inner unit and the outer unit of the air conditioner. As shown in fig. 7, in the three-wire system zero-live wire communication circuit of the air conditioner internal and external units as shown in fig. 2, when the zero-live wire is connected reversely, although the zero-live wire can charge the communication power supply, the internal and external units cannot form a communication current loop through the zero wire N and the communication wire COM, so that the reverse connection of the zero-live wire can cause the failure of the zero-live wire communication function, and the air conditioner cannot work normally. Therefore, the problem that the communication failure of the inner and outer units cannot work due to the reverse connection of the zero line and the fire line of the communication current source of the air conditioner outdoor unit is required to be correctly connected.

Fig. 8 is a schematic structural diagram of an embodiment of an indoor unit system of an air conditioner in the related art. In the air conditioning indoor unit system shown in fig. 8, 220V AC is generally input to the air conditioning indoor unit, and the power is supplied to the indoor unit through a switching power supply after passing through a strong current filter, a rectifier bridge (not shown in fig. 8) and a filter capacitor. Wherein, the switch K-1 and the switch K-2 play a role in controlling the power supply of the air conditioner outdoor unit. The zero and fire wire communication module is controlled by the MCU and is connected with the zero wire and the fire wire.

Fig. 9 is a schematic structural diagram of an embodiment of an outdoor unit system of an air conditioner according to the related art. In the air conditioning outdoor unit system shown in fig. 9, the air conditioning outdoor unit generally receives 220V AC from the indoor unit, and supplies power to the outdoor unit through a switching power supply after passing through a strong current filter, a rectifier bridge (not shown in fig. 9), and a filter capacitor. The communication of the zero and fire wire communication module is controlled by the MCU and is connected with the zero wire and the fire wire.

Fig. 10 is a schematic structural diagram of an embodiment of an indoor unit line sequence recognition and alignment system of an air conditioner according to the present invention. As shown in fig. 10, the line sequence recognition and alignment system for an air conditioner indoor unit provided by the scheme of the invention includes: the internal and external machine current identification auxiliary circuit, the internal machine zero and live wire reverse connection identification and alignment circuit, the strong current rectification filter circuit, the bus capacitor and the switching power supply.

In the scheme of the invention, a diode is connected in series to the live wire between the inner machine and the outer machine selectively after the power-on, and then the current flow direction of the outdoor machine is detected by a current flow direction detection circuit so as to judge the zero live wire sequence between the inner machine and the outer machine.

In the example shown in fig. 10, an AC power supply AC is connected to a switching power supply via a connection terminal a and a connection terminal B, on the one hand, via a strong current rectifying and filtering circuit and a bus capacitor, and on the other hand, to an on-demand identification auxiliary circuit for an internal and external machine and an internal machine zero-live wire reverse connection identification and rectification circuit, respectively.

In some embodiments, the neutral detection module comprises: the device comprises a first switch module, a current limiting module, a bidirectional diode module, a capacitor module and a signal acquisition and processing module. A first switching module such as switches K-N, a current limiting module such as a protection resistor RS, a bi-directional diode module such as the bi-directional diode of fig. 6, and a capacitance module such as the capacitance C of fig. 6.

And taking any one of the first power line of the internal machine and the second power line of the internal machine as an internal machine detection line. The internal machine detection is connected to the first end of the bidirectional diode module and the first end of the capacitor module after passing through the first switch module and the current limiting module, and is connected to the first end of the signal acquisition processing module. The second end of the bidirectional diode module and the second end of the capacitor module are connected to the second end of the signal acquisition processing module. The second end of the bidirectional diode module is also connected with the shell. And the third end of the signal acquisition processing module is used as an output end for outputting a zero line detection result to a controller (such as an MCU) of the air conditioner. The fourth end of the signal acquisition and processing module is connected with a direct current power supply (such as VCC/2).

In the bidirectional diode module, the anode of the first diode is connected with the cathode of the second diode, and the cathode of the first diode is connected with the anode of the second diode. The signal acquisition processing module adopts a differential amplifying circuit.

And under the condition that the first switch module is closed, the signal acquisition processing module outputs a zero line detection result that the internal machine detection line is a live line or a zero line.

Fig. 4 is a schematic structural diagram of an embodiment of a user mains supply home wiring circuit in a related scheme. As shown in fig. 4, the three-phase high voltage power is converted into a single-phase 220V mains power through a transformer. Wherein, zero line N is connected with the earth, and the casing PE of the electric appliance is connected with the earth, therefore, zero line N and casing PE are equipotential. There is a potential difference between the live wire L and the cabinet PE, and there is no potential difference between the neutral wire N and the cabinet PE. According to the characteristic principle, the zero line and the fire line can be distinguished. Wherein COM is a communication line.

According to the specification of the national standard GB8218 low-voltage electricity tester, the voltage of the neon bulb of the electricity tester is not lower than 50V but not higher than 90V, and the working current of the neon bulb is not higher than 0.4mA but not lower than 0.1mA. From this, it is known that the current limiting resistor in the test pencil for a low voltage distribution system of 1 to 500V has a resistance value of 1 to 5MΩ. The current perceived by a person is more than 1 milliamp, and the current causing electric shock is more than 10 milliamps and is far more than 0.14 milliamps.

Thus, it can be concluded that: when the test pencil is used, current passes through a human body, but the current is too weak, so that people cannot feel the current at all, and electric shock cannot be caused. Therefore, if the passing detection current is limited to be lower than the human body safety current, the electric safety specification can be met as well.

Fig. 5 is a schematic diagram of a configuration of an embodiment of a zero-fire line detection circuit in the related scheme. In the zero-live line detection circuit shown in fig. 5, the live line L is divided and limited by the resistor R1 and the resistor R2 to provide the working voltage for the optocoupler module OP. However, the input current of the optocoupler module OP is generally larger than 1mA, the current flowing through the resistor R1 is far larger than 1mA, so that the leakage current of the live wire L is excessively large, the live wire L is connected to the casing through the resistor R1 and the resistor R2, if the casing is grounded and has a problem, the whole casing is electrified with the live wire L at equal potential, and a large electrical risk exists.

The zero line detection circuit in the example shown in fig. 10 corresponds to the zero line identification circuit shown in fig. 6. Fig. 6 is a schematic diagram of a zero line identification circuit according to the present invention. The zero line identification circuit shown in fig. 6 is required to detect the zero line aiming at the leakage current and the electrical risk brought by the zero line detection circuit, and then the zero line is connected into the zero line and fire wire communication circuit to complete the establishment of a communication loop (namely a communication current loop). Considering that the zero line detection needs to form a loop with the zero line and the shell, and electrical risks exist, in the scheme of the invention, a sufficiently large current limiting protection resistor RS and a relay switch K-N are required to be arranged in a zero line identification circuit.

In the scheme of the invention, the potential risk of electric shock is reduced by adopting the current limiting function of the high-resistance resistor in the zero line identification circuit, the voltage at two ends of the diode is collected by the operational amplifier circuit, and the series control switch in the zero line detection circuit is used for detecting after the first power-on.

In the zero line identification circuit shown in fig. 6, the detection end a (D) is connected to the anode of the diode D, the first end of the capacitor C, and the first end of the signal acquisition processing module after passing through the switch K-N and the current limiting protection resistor RS. The cathode of the diode D is connected with the shell, the second end of the capacitor C is connected with the cathode of the diode D, and the second end of the capacitor C is also connected with the second end of the signal acquisition and processing module. Another diode is connected in parallel between the diode D and the capacitor C, the anode of the diode is connected with the cathode of the diode D, the cathode of the diode is connected with the anode of the diode D, and the diode D form a bidirectional diode. In the signal acquisition processing module, a first end of the signal acquisition processing module is connected to an inverting input end of the operational amplifier after passing through a resistor R. The second end of the signal acquisition processing module is connected to the non-inverting input end of the operational amplifier after passing through the other resistor R. The inverting input of the operational amplifier also passes through a resistor R _f And the output end of the operational amplifier is used as an AD signal sampling end. The non-inverting input end of the operational amplifier also passes through another resistor R _f And a rear ground power supply VCC/2. The switches K-N may be relay switches.

In the example shown in fig. 6, diode D has unidirectional conductivity and a very low voltage drop of about U _D V (with different voltage drops depending on the type of diode). The capacitor C is an energy storage capacitor, and the signal acquisition processing module is a differential amplifierA large circuit.

In the example shown in fig. 6 (b), the bidirectional diode has the function that if a (D) detected by the detection terminal a (D) is a live wire, the voltage of the capacitor C when the diode is turned on in the first half period of the alternating current is about U _D When the highest voltage of the capacitor in the latter half period of the alternating current of the detection end is up to 311V, the voltage of the two ends of the capacitor C is reduced in order to protect the circuit safety of the capacitor C and the signal acquisition and processing module behind the capacitor C, so that the problem is solved by adopting a mode that the diodes are reversely connected in parallel to form a bidirectional diode.

In the example shown in fig. 6, if the line a on which the null line identification circuit is located is a null line, the voltage across the diode D is 0V, and the voltage across the ad signal sampling terminal is VCC/2V.

In the example shown in FIG. 6, if line A on which the neutral identification circuit is located is a fire wire, the voltage across diode D is about + -U _D V (changing with alternating voltage), the voltage is sampled as ± (R) _f /R)*U _D +VCC/2V。

In the example shown in fig. 6, when the relay switch K-N is closed, the current through the protection resistor (i.e., the current limiting protection resistor RS) is as small as possible, and it is known from the example shown in fig. 4 that the protection resistor (i.e., the current limiting protection resistor RS) can play a role in protection. At this time, the two ends of the diode D have stable voltage, so that the zero line identification circuit can be ensured to stably collect the collected signals. When the zero line identification is finished, the relay switch K-N is immediately turned off, so that the electrical safety can be ensured to the greatest extent possible.

In some embodiments, the neutral selection module comprises: a first neutral selection branch and a second neutral selection branch. The first power line of the inner machine is connected to the inner machine communication module after passing through the first zero line selection branch, and the second power line of the inner machine is connected to the inner machine communication module after passing through the second zero line selection branch.

The first zero line selection branch circuit and the second zero line selection branch circuit have the same structure. The first zero line selection branch circuit comprises: the first diode module, the first protection module and the second switch module. The first diode module is shown as a diode D in the air conditioner indoor unit in FIG. 15, the first protection module is shown as a resistor R in the air conditioner indoor unit in FIG. 15, and the second switch module is shown as a switch K-3 or a switch K-4 in the air conditioner indoor unit in FIG. 15.

Wherein, the liquid crystal display device comprises a liquid crystal display device,

the first power line of the internal machine is connected to the cathode of the diode module. The anode of the first diode module is connected to the internal machine communication module after passing through the first protection module and the second switch module.

And when the second switch module is closed, the first power line of the internal machine is connected to the internal machine communication module.

The zero line selection switch in the example shown in fig. 10 corresponds to the zero line selection and protection circuit part of the right half part of the conditioning circuit for the communication of the zero line and the live line of the indoor unit and the outdoor unit of the air conditioner shown in fig. 15. Fig. 15 is a schematic structural diagram of an embodiment of a zero-live wire communication self-regulating circuit of an air conditioner according to the present invention. In the example shown in fig. 15, the air conditioner is provided with a neutral selection and inclusion circuit and a communication simplifying circuit. In the simplified communication circuit, a resistor and a diode are connected in series, one end of the resistor, which is far away from the anode of the diode, is connected to the communication line COM, and the cathode of the diode is connected to the zero line selection and protection circuit. In the zero line selection and protection circuit, two paths are arranged, each path is formed by connecting a switch, a resistor R and a diode D in series, the anode of the diode D is connected with the switch, the cathode of the diode D is connected to a wiring terminal, and the switch is connected with the communication simplifying circuit. Two switches such as switch K-3 and switch K-4. The cathode of the diode D of one path is connected to the connecting terminal A, and the cathode of the diode D of the other path is connected to the connecting terminal B.

In some embodiments, the internal and external line-sequence identification auxiliary unit includes: a first auxiliary branch and a second auxiliary branch. The first power line of the internal machine is connected to a first output line through the first auxiliary branch, and the second power line of the internal machine is connected to a second output line through the second auxiliary branch. The first output line can be connected with one external machine power line of the external machine first power line and the external machine second power line. The second output line can be connected with the other external machine power line in the external machine first power line and the external machine second power line. The first power line of the inner machine is like line A, the second power line of the inner machine is like line B, the first output line is like line D, the second output line is like line C, the first power line of the outer machine is like line E, and the second power line of the outer machine is like line F.

The first auxiliary branch and the second auxiliary branch have the same structure. The first auxiliary branch comprises: a second diode module and a third switch module. A second diode module, such as the diode of fig. 10, and a third switch module, such as switch K-1 or switch K-2 of fig. 10. The second diode module is connected in parallel with the third switch module. And the first power line of the internal machine is connected to the anode of the second diode module. And a cathode of the second diode module is connected to the first output line.

Under the condition that the third switch module is closed, a connecting line between the first power line of the inner machine and the first output line is connected, so that a connecting line between the first power line of the inner machine and an outer machine power line connected with the first output line in the first power line of the outer machine and the second power line of the outer machine is connected.

In the example shown in fig. 10, the internal and external machine on-demand identification auxiliary circuit includes: MCU, switch K-1, switch K-2, diode D1 and diode D2. The utility model provides an interior machine zero live wire reverse connection discernment and alignment circuit, includes: zero live wire communication module, zero line selection switch and zero line detection circuitry.

The first end of the zero line detection circuit is connected to the MCU, the second end of the zero line detection circuit is connected to the wiring terminal A, the first end of the zero line selection switch and the anode of the diode D1 respectively, and the third end of the zero line detection circuit is connected with the shell. The second end of the zero line selection switch is respectively connected to the wiring terminal B and the anode of the diode D2, the third end of the zero line selection switch is connected with the first end of the zero line and fire wire communication module, and the fourth end of the zero line selection switch is connected with the MCU. And a second end of the zero and fire wire communication module is connected with a communication line COM, and a third end of the zero and fire wire communication module is connected with the MCU. The switch K-1 is connected in parallel with a diode D1, and the cathode of the diode D1 is connected to the connection terminal D. The switch K-2 is connected in parallel with the diode D2, the cathode of the diode D2 being connected to the connection terminal C. The wiring terminal C and the wiring terminal D are in-phase with the external air conditioner.

In the scheme of the invention, the zero line is connected into the zero-live line communication loop of the indoor unit by adopting the selector switch. In the line sequence recognition and alignment system of the indoor unit of the air conditioner shown in fig. 10, diodes (such as a diode D1 and a diode D2) are added compared with the indoor unit side in the related scheme, so that the unidirectional conduction function is realized. The neutral identification circuit can identify the neutral of the hung line. The zero line selection switch is connected with the zero line for the zero line and fire wire communication module. Since the diodes (e.g., diode D1 and diode D2) of connection D are connected in the same direction as the diodes (e.g., diode D1 and diode D2) of connection C in series, current cannot pass when switch K-1 and switch K-2 are simultaneously turned off. When the switch K-1 and the switch K-2 are simultaneously closed, the diodes (such as the diode D1 and the diode D2) are short-circuited, the alternating current can normally pass through, and the structure formed by the diode D1 and the diode D2 can also play a role of a switch. Unidirectional flow of current may be achieved when one of switches K-1, K-2 is closed and one is open.

In some embodiments, the external machine line sequence identification and alignment unit includes: the current flows to the detection module and the zero fire wire power supply switching module. The current flow direction detection module is used for detecting the current flow direction, and the zero-live wire power supply switching module is used for detecting the zero-live wire power supply switching circuit. The current flow direction detection module and the zero-live wire power supply switching module are respectively connected with the external machine first power line and the external machine second power line. The current flow direction detection module and the zero-live wire power supply switching module are sequentially connected to the external machine communication module.

The external machine line sequence recognition and alignment unit recognizes the current flow direction of the first power line of the external machine and the second power line of the external machine, selects the first zero fire wire communication power supply and the corresponding zero fire wire communication power supply in the second zero fire wire communication power supply to be communicated with a connecting line between the external machine communication modules, and comprises:

the current flow direction detection module is configured to identify a current flow direction of the external machine first power line and the external machine second power line.

The zero-live wire power supply switching module is configured to select a connecting wire between a corresponding zero-live wire communication power supply of the first zero-live wire communication power supply and the second zero-live wire communication power supply and the external machine communication module to be connected based on the recognized current flow directions of the first power supply wire of the external machine and the second power supply wire of the external machine.

Fig. 11 is a schematic structural diagram of an outdoor unit system of an air conditioner according to an embodiment of the present invention. As shown in fig. 11, in order to solve the problem of circuit cost adjustment after reverse connection of zero and live wires between an indoor unit and an outdoor unit, the air conditioner outdoor unit system provided by the scheme of the invention comprises: the device comprises a strong current rectifying and filtering circuit, a bus capacitor, a switching power supply and an external machine line sequence identification and alignment circuit.

In the example shown in fig. 11, the connection terminal E and the connection terminal F are connected to the switching power supply after passing through the strong current rectifying and filtering circuit and the bus capacitor on the one hand, and to the external machine line sequence recognition and alignment circuit on the other hand.

In the example shown in fig. 11, the external machine line sequence recognition and alignment circuit includes: the current flows to the detection circuit, the MCU, the zero fire wire power supply switching circuit and the zero fire wire communication module. The current flow direction detection circuit and the zero-live wire power supply switching circuit are respectively connected to the wiring terminal E and the wiring terminal F. The current flow direction detection circuit, the MCU, the zero fire wire power supply switching circuit and the zero fire wire communication module are sequentially connected. The communication line COM is connected to the zero fire wire communication module. The current flow direction detection circuit in fig. 11 corresponds to the current flow direction detection circuit shown in fig. 14, the zero-live wire power supply switching circuit in fig. 11 corresponds to the self-conditioning circuit for zero-live wire communication of the inside and outside air conditioner shown in fig. 15), and the double-communication power supply, the communication power supply switch and the protection circuit part in the left circuit part.

In the example shown in fig. 11, the current flow detection circuit may detect the current flow of the EF line (i.e., the line on which the terminal E and the terminal F are located) at the time of power-on. The zero-live wire power supply switching circuit can provide a correct power supply for the zero-live wire communication module.

Comparing the example shown in fig. 8 with the example shown in fig. 9 and the example shown in fig. 10 with the example shown in fig. 11, it is clear that the examples shown in fig. 10 and 11 are less used and less costly than the examples shown in fig. 8 and 9.

Fig. 12 is a schematic structural diagram of an internal and external wiring equivalent circuit according to the present invention, in which (a) is a schematic structural diagram of a first embodiment of the internal and external wiring equivalent circuit, (b) is a schematic structural diagram of a second embodiment of the internal and external wiring equivalent circuit, (c) is a schematic structural diagram of a third embodiment of the internal and external wiring equivalent circuit, and (d) is a schematic structural diagram of a fourth embodiment of the internal and external wiring equivalent circuit. Referring to the example shown in FIG. 12, there are two modes of connection between the internal and external units, E-D, F-C, and E-C, F-D. As two wiring modes exist between the internal machine and the mains supply, the internal machine is connected in a positive way and the mains supply is connected in a reverse way. The rule one present in fig. 12 is: a diode is connected in series in a circuit where the live wire is located, and the direction of the diode is L to N. The second rule is: the unidirectional conductivity of the diode leads the current of the circuit where the diode is positioned to be certain, so that the zero line in the outdoor unit can complete identification.

The following method can be designed according to the rules: and recognizing the zero line through the zero line recognition circuit, controlling the switch K-1 or the switch K-2 where the zero line is positioned to be closed by the MCU, shorting out the diode where the zero line is positioned, and connecting the diode where the live wire is positioned in series to the circuit. A similar effect as in fig. 12 can be achieved. At this time, the current direction in the outdoor unit is detected, and the zero line sequence in the outdoor unit can be obtained.

Fig. 13 is a schematic diagram of an external time-current curve according to the present invention, wherein (a) is a schematic diagram of a first embodiment of the external time-current curve, (b) is a schematic diagram of a second embodiment of the external time-current curve, and (c) is a schematic diagram of a third embodiment of the external time-current curve. In the external time-current graph shown in fig. 13, the current curve corresponding to (a) in fig. 13 corresponds to the circuit structure of the internal and external wiring equivalent circuit diagram in (a) (d) in fig. 12. The current curve corresponding to (b) in fig. 13 corresponds to the circuit structure of the internal and external machine wiring equivalent circuit diagram in (b) (c) in fig. 12. Fig. 13 (c) is a schematic diagram of a normal ac current after the indoor unit switch K-1 and the switch K-2 are closed and the two diodes are shorted. The switch K-1 and the switch K-2 may both be relay switches.

In some embodiments, the current flow detection module comprises: the first electrolytic capacitor module comprises a first optocoupler module, a second optocoupler module, a third diode module and a fourth diode module, wherein the first resistor module, the second resistor module, the third resistor module, the fourth resistor module, the fifth resistor module and the sixth resistor module are arranged in the first electrolytic capacitor module and the second electrolytic capacitor module. The first optocoupler module is shown as optocoupler module OP1 in fig. 14, the second optocoupler module is shown as optocoupler module OP2 in fig. 14, the third diode module is shown as diode D-1 in fig. 14, the fourth diode module is shown as diode D-2 in fig. 14, the first resistor module is shown as resistor R3-1 in fig. 14, the second resistor module is shown as resistor R1 in fig. 14, the third resistor module is shown as resistor R3-2 in fig. 14, the fourth resistor module is shown as resistor R in fig. 14, the fifth resistor module is shown as resistor R in fig. 14, the sixth resistor module is shown as resistor R2 in fig. 14, the first electrolytic capacitor module is shown as one electrolytic capacitor in fig. 14, and the second electrolytic capacitor module is shown as another electrolytic capacitor in fig. 14.

The first output terminal (e.g., terminal e-1) of the current flow detection structure is a collector of the transistor side of the first optocoupler module. The second output terminal (e.g., terminal e-2) of the current flow detection structure is the collector of the transistor side of the second optocoupler module.

The direct current power supply is connected to a collector electrode of a transistor side of the first optical coupler module after passing through the first resistor module, an emitter electrode of the transistor side of the first optical coupler module is grounded, the diode side of the first optical coupler module is connected with the first electrolytic capacitor module and the fourth resistor module in parallel, an anode of the diode side of the first optical coupler module is connected with an anode of the first electrolytic capacitor module and a cathode of the third diode module, and a cathode of the first electrolytic capacitor module is connected with a second power line of the external machine after passing through the sixth resistor module.

The direct current power supply is further connected to a collector electrode of the transistor side of the second optocoupler module after passing through the third resistor module, an emitter electrode of the transistor side of the second optocoupler module is grounded, the diode side of the second optocoupler module is connected with the second electrolytic capacitor module and the fifth resistor module in parallel, a cathode of the diode side of the second optocoupler module is connected with a cathode of the second electrolytic capacitor module and an anode of the fourth diode module, and an anode of the second electrolytic capacitor module is connected with the second power line of the external machine after passing through the sixth resistor module.

Fig. 14 is a schematic diagram of a current flow direction detection circuit according to an embodiment of the invention. As shown in fig. 14, in the current flow direction detection circuit according to the embodiment of the present invention, the dc power VCC is connected to the collector of the transistor side of the optocoupler module OP1 via the resistor R3-1, and the emitter of the optocoupler module OP1 is grounded. The anode of the diode side of the optocoupler module OP1 is respectively connected to the cathode of the diode D-1, the anode of an electrolytic capacitor, and the first end of a resistor R, the cathode of the diode side of the optocoupler module OP1 is respectively connected to the cathode of the electrolytic capacitor, the second end of the resistor R, the anode of the other electrolytic capacitor, the anode of the diode side of the optocoupler module OP2, and the first end of the resistor R2, and the second end of the resistor R2 is connected to the connection terminal F. After passing through the resistor R1, the connection terminal E is connected to the anode of the diode D-1 on the one hand and to the cathode of the diode D-2 on the other hand. The anode of the diode D-2 is connected to the first end of the other resistor R, the cathode of the other electrolytic capacitor, and the cathode of the diode side of the optocoupler module OP2, respectively. The emitter of the diode side of the optocoupler module OP2 is grounded GND. The DC power VCC is connected with the collector electrode of the transistor side of the optocoupler module OP2 through a resistor R3-2. The common end of the resistor R3-1 and the optical coupler module OP1 is an e-1 end, and the common end of the resistor R3-2 and the optical coupler module OP2 is an e-2 end.

In the example shown in fig. 14, the current flow detection circuit is connected in parallel to two ends of EF, when the current flows from E to F, E-1 is changed from high level to low level, and E is the live wire. When the current flows from F to E, E-2 is changed from high level to low level, and F is the live wire. At this time, the current direction in the outdoor unit is detected, and the zero line sequence in the outdoor unit can be obtained.

In some embodiments, the zero line power switching module includes: a first identification leg and a second identification leg. The first power line of the external machine is connected to the external machine communication module after passing through the first zero-live wire communication power supply and the first identification branch. And the second power line of the external machine is connected to the external machine communication module after passing through the second zero-live wire communication power supply and the second identification branch.

The first identification branch and the second identification branch have the same structure. The first identification branch comprises: the second protection module is shown as a resistor R of the air conditioner outdoor unit in fig. 15, the fifth diode module is shown as a diode D of the air conditioner outdoor unit in fig. 15, and the fourth switch module is shown as a switch K-5 or a switch K-6 of the air conditioner outdoor unit in fig. 15. And the first power line of the external machine is connected with the anode of the fifth diode module after passing through the first zero-live wire communication power supply and the second protection module. And the cathode of the fifth diode module is connected to the external communication module after passing through the fourth switch module.

As shown in fig. 15, in the self-conditioning circuit for communication between the zero line and the live line of the air conditioner external unit in the scheme of the invention, the air conditioner external unit is provided with a communication simplifying circuit, a communication power supply selection switch, a protection circuit and a double communication power supply. In the simplified communication circuit, a resistor and a diode are connected in series, one end of the resistor, which is far away from the anode of the diode, is connected to a communication power supply selection switch and a protection circuit, and the cathode of the diode is connected to a communication line COM. In the communication selection switch and the protection circuit, two paths are arranged, each path is formed by connecting a switch, a diode D and a resistor R in series, the cathode of the diode D is connected with the switch, the anode of the diode D is connected with the resistor R, and the switch is connected with the communication simplification circuit. Two switches such as switch K-5 and switch K-6. The resistor of one path is connected to the power supply 1 in the dual-communication power supply, the resistor of the other path is connected to the power supply 2 in the dual-communication power supply, and a resistor Rb is arranged between the power supply 1 and the power supply 2. In the power supply 1, the anode of the zener diode ZD1 is connected to the connection terminal E, the cathode of one electrolytic capacitor C1, the anode of one electrolytic capacitor C1 is connected to the communication power supply selection switch and the protection circuit, and the cathode of one diode D1, respectively, and the cathode of the zener diode ZD1 is connected to the anode of the one diode D1. In the power supply 2, the anode of the zener diode ZD2 is connected to the connection terminal F and the cathode of the other electrolytic capacitor C2, the anode of the other electrolytic capacitor C2 is connected to the communication power supply selection switch and the protection circuit, and the cathode of the other diode D1, respectively, and the cathode of the zener diode ZD1 is connected to the anode of the other diode D1.

The diode is connected in series with the live wire between the inner machine and the outer machine by utilizing the unidirectional conductivity of the diode, so that the current flow direction detection circuit in the outdoor machine identifies the line sequence of the zero live wire between the inner machine and the outer machine. Provision is made for selection of a subsequent communication power supply (selection of a communication power supply in the example shown in fig. 15). In the scheme of the invention, a complete communication circuit is constructed by designing a double-communication power supply and controlling and correctly connecting the power supply into a communication loop of an external machine. In the switch short-circuit protection circuit, the switch may be a relay switch. D in the internal and external machine is a protective diode, and the resistor R plays a role in limiting current in the communication process, and is mainly used for preventing the short circuit caused by misleading of the relay switch K-5 and the relay switch K-6 and the relay switch K-3 and the relay switch K-4.

As can be seen from the examples shown in fig. 14 and 15, when the indoor unit or the outdoor unit of the air conditioner has the reverse connection of the zero line and the fire line, the zero line connection of the air conditioner zero line communication module is only required to be ensured to be correct.

In some embodiments, the first and second neutral communication power supplies are identical in structure. The first zero live wire communication power supply comprises: the device comprises a voltage stabilizing module, a third electrolytic capacitor module and a sixth diode module. The external machine first power line is respectively connected to the anode of the voltage stabilizing module and the cathode of the third electrolytic capacitor module. The cathode of the voltage stabilizing module is connected to the anode of the sixth diode module. And the cathode of the sixth diode module is connected with the anode of the third electrolytic capacitor module and is connected to the zero-live wire power supply switching module.

In the example shown in fig. 15, the external-side dual-communication power supply has a symmetrical structure, and the output voltages are equal. Resistor Rb is a voltage dividing resistor. The zener diode ZD1 and the zener diode ZD2 are zener diodes, and play a role in voltage stabilization. When the voltage between the line E and the line F is positive, the zener diode ZD1 is turned on in the forward direction to become a normal diode, the zener diode ZD2 breaks down in the reverse direction, and works in a regulated state to start charging the electrolytic capacitor C2. When the voltage between the line E and the line F is negative, the zener diode ZD1 breaks down reversely, works in a voltage stabilizing state, starts to charge the electrolytic capacitor C1, and the zener diode ZD2 is conducted in the forward direction to become a common diode. The diode D1 in the power supply 1 and the power supply 2 is an anti-reverse diode.

Referring to an example shown in fig. 15, in the scheme of the present invention, the working principle of the self-conditioning circuit for communication between the indoor unit and the outdoor unit of the air conditioner can be described by the following example.

And at the outdoor unit side, if E is a zero line, closing a relay switch K-5 under the control of the MCU, and connecting the power supply 1 into a communication loop. If F is zero line, under MCU control, closing relay switch K-6 to connect power supply 2 into communication loop.

And if the line A is a zero line at the indoor machine side, closing a relay switch K-3 under the control of the MCU, and connecting the line A into a communication loop. If B is zero line, under MCU control, closing relay switch K-4, and connecting line B into communication loop.

Fig. 17 is a schematic general structural diagram of a conditioning apparatus for a zero-line wire sequence of an air conditioner according to an embodiment of the present invention. The general structure of the zero-live line sequence conditioning device of the air conditioner provided by the scheme of the invention can be seen from an example shown in fig. 17.

By adopting the technical scheme of the invention, the indoor unit is powered on by arranging the zero line detection circuit and the zero line selection switch on the indoor unit side, then the zero line detection circuit is used for detecting the zero line and the fire line of the indoor unit, and the zero line and the fire line communication module is communicated through the zero line selection switch. An inner and outer machine line sequence detection module is arranged between an indoor machine and an outdoor machine, a current flow direction detection circuit and a zero and fire wire power supply switching circuit are arranged on the outdoor machine side, under the condition that an indoor machine zero line is connected with a zero and fire wire communication module, the current flow direction is controlled to start, the zero and fire wire communication module on the outdoor machine side is detected, and the zero and fire wire power supply switching circuit is connected with the zero and fire wire communication module on the outdoor machine side according to a detection result, so that the indoor machine zero and fire wire is detected and regulated after the indoor machine is electrified, and then the inner and outer machine zero and fire wire line sequence is detected and regulated after the outdoor machine is electrified, so that the zero and fire wire between the air conditioning indoor machine and the commercial power and the air conditioning indoor and the air conditioning are installed without distinguishing, the assembly difficulty of the zero and fire wire between the air conditioning indoor machine and the commercial power and the air conditioning indoor machine is greatly reduced, and the risk that the zero and fire wire between the air conditioning indoor machine and the air conditioning is assembled in an incorrect state is avoided.

According to an embodiment of the present invention, there is further provided a control method of a zero-line wire sequence conditioning device of an air conditioner corresponding to the device, as shown in a flow chart of an embodiment of the method of the present invention in fig. 16. The control method of the zero-live wire line sequence conditioning device of the air conditioner can comprise the following steps: step S110 to step S130.

At step S110, an inner machine zero-live wire reverse connection identifying and aligning unit is controlled to identify the zero line in the inner machine first power line and the inner machine second power line, and connect the connecting line between the zero line in the inner machine first power line and the inner machine second power line and the inner machine communication module, so as to connect the zero line in the inner machine first power line and the inner machine second power line into the communication current loop.

At step S120, an internal and external machine line sequence identification auxiliary unit is controlled, and when the zero line in the first power line of the internal machine and the second power line of the internal machine is connected to the communication current loop, the power supply line where the zero line in the first power line of the internal machine and the second power line of the internal machine is located is connected to the power supply line of the corresponding external machine in the first power line of the external machine and the second power line of the external machine, so as to connect the power supply line of the internal machine for supplying power to the external machine. The first output line and the second output line of the internal and external machine line sequence identification auxiliary unit can be correspondingly connected with the external machine first power line and the external machine second power line. Therefore, the power supply circuit where the zero line in the first power line of the inner machine and the second power line of the inner machine is, via the corresponding output lines in the first output line and the second output line of the inner machine line sequence identification auxiliary unit, connected with the corresponding outer power line in the corresponding connection of the first power line of the outer machine and the second power line of the outer machine.

At step S130, the external machine line sequence recognition and alignment unit is controlled, and under the condition of switching on the power supply line for supplying power to the external machine by the internal machine, the current flow directions of the first power line of the external machine and the second power line of the external machine are recognized, and the connection line between the corresponding zero-live wire communication power supply of the first zero-live wire communication power supply and the second zero-live wire communication power supply and the external machine communication module is selected to be switched on, so that the corresponding zero-live wire communication power supply of the first zero-live wire communication power supply and the second zero-live wire communication power supply is connected into the communication current loop.

In some embodiments, the control method of the zero-live wire line sequence self-regulating circuit of the internal and external units for the air conditioner provided by the scheme of the invention comprises the following steps:

step 1, firstly, a zero line detection circuit is used for identifying the zero line of the indoor unit, and then the zero line is correctly connected into a communication module of the indoor unit part, and specifically, the examples shown in fig. 6 and 15 can be referred to.

The principle of zero line recognition of the indoor unit and the working process are shown in fig. 4, 5 and 6.

Step 2, a diode is connected in series to the live wire by controlling a switch (such as a relay switch), and the unidirectional conductivity of the diode is utilized to enable the current flow direction detection circuit in the outdoor unit to identify the line sequence between the indoor unit and the outdoor unit, so as to detect the zero line of the outdoor unit, which can be seen in the examples shown in fig. 12 and 13.

The principle of identifying the zero line sequence between the inner machine and the outer machine and the working process are shown in the examples shown in fig. 10, 11, 12, 13 and 14 in detail.

And 3, after the zero line of the outdoor unit is determined, controlling the communication power supply selection switch in the step 3 to enable the communication power supply to be correctly connected into the communication circuit, and specifically referring to examples shown in fig. 14 and 15. At this time, the communication circuit loop is established, communication can be started normally at this time, and the whole alignment process is completed.

The principle and the working process of the self-conditioning circuit for the communication between the zero line and the live line of the air conditioner indoor unit and the air conditioner indoor unit are shown in the examples shown in fig. 1, fig. 2, fig. 14 and fig. 15 in detail.

Taking the outdoor unit as an example, because of the existence of a larger electrolytic capacitor (filter capacitor), the electrolytic capacitor needs to be charged after the outdoor unit is electrified, and a certain time is needed for providing normal voltage for an air conditioner outdoor unit system from the electrification to the normal and stable operation of the switching power supply. The time from the power-on of the outdoor unit to the stable VCC is t ₀ . After the wiring is finished, the indoor unit is started, the power-on is started, the switching power supply of the indoor unit of the air conditioner starts to work, and normal and stable voltage is supplied to the MCU and a peripheral control circuit thereof. At this time, the MCU controls the relay switch K-N to be closed, and zero line identification is started on the line A.

In which, referring to the example shown in fig. 11, a diode is connected in series to the line where the hot line L is located. And detecting which is the zero line controls the relay switch of the line where the zero line is located to be closed, namely shorting the diode where the zero line is located. If the detection result of the zero line detection circuit is that the line A is the zero line, the relay switch K-1 is controlled to be closed, so that the diode D of the line where the live wire L (namely the line B) is located is connected in series into the circuit. And under the control of the MCU, the relay switch K-3 is closed, and the line A is connected into the communication loop.

If the detection result of the zero line detection circuit is that the line A is the live line, the relay switch K-2 is controlled to be closed, so that the diode D of the line where the live line L (namely the line A) is located is connected in series into the circuit. And under the control of the MCU, the relay switch K-4 is closed, and the line B is connected into the communication loop.

After the relay switch is closed, the unidirectional conductivity of the diode changes the alternating current into direct current to supply power to the external machine, and the time 2*t elapses ₀ And then the MCU in the external machine starts to detect output signals at two ends of the current module, so as to judge the zero line sequence of the EF line of the external machine. The details of the zero-live wire between the internal and external units are described in detail by the descriptions of figures 11, 12 and 13The manner of sequence determination is not described here.

After the zero line identification process is finished, the MCU controls the relay switch K-N to be disconnected, and the relay switch K-N is disconnected with a zero (fire) line. Wherein, the relay switch K-N in the zero line detection. After the switch is disconnected, the detected line and the shell can be completely disconnected. The detected point may be a live wire, and there is an electrical connection between the live wire and the enclosure, and the components RS and C, D may be short-circuited due to a fault, resulting in electrification of the enclosure. The switches K-N are provided in order to ensure as safe as possible. And on the external side, if E is a zero line, closing a relay switch K-5 under the control of the MCU, and connecting the power supply 1 into a communication loop. If F is zero line, under MCU control, closing relay switch K-6 to connect power supply 2 into communication loop.

In summary, the workflow of the scheme of the invention is as follows: the method comprises the steps of starting up an internal machine to power up, starting normal operation after the output voltage of a switching power supply is stabilized, controlling zero line detection by an MCU, controlling an internal machine zero line and fire wire communication selection switch (K-3 or K-4), simultaneously controlling a switch (K-1 or K-2), starting line sequence detection of the internal machine and the external machine, starting power up of the external machine, starting normal operation after the output voltage of the switching power supply is stabilized, detecting the current direction by the MCU so as to judge the line sequence between the internal machine and the external machine, controlling the switch (K-5 or K-6) to select the zero line and fire wire communication power supply, establishing a zero line and fire wire communication loop, trying communication, and finishing line sequence adjustment of the internal machine and the external machine. Above, the zero live wire line sequence alignment work between the interior machine of air conditioner is over, and only carries out the zero live wire alignment of once after powering on, can make the installation of the zero live wire between interior machine of air conditioner and commercial power, the interior machine of air conditioner need not distinguish, reduces the installation degree of difficulty, eliminates the problem that the zero live wire connects the reflection to lead to, improves installation effectiveness. And moreover, the zero firing line is identified by using a unique circuit structure, so that the electrical risk and the electric leakage problem can be effectively reduced, the safety performance is improved, and the use cost of additional devices can be reduced.

Since the processes and functions implemented by the method of the present embodiment substantially correspond to the embodiments, principles and examples of the foregoing apparatus, the descriptions of the present embodiment are not exhaustive, and reference may be made to the related descriptions of the foregoing embodiments, which are not repeated herein.

By adopting the technical scheme of the embodiment, the indoor unit is powered on by arranging the zero line detection circuit and the zero line selection switch on the indoor unit side, then the zero line detection circuit is used for detecting the zero line and the fire line of the indoor unit, and the zero line and the fire line communication module are communicated through the zero line selection switch; an inner and outer machine line sequence detection module is arranged between the indoor machine and the outdoor machine, a current flow direction detection circuit and a zero and fire wire power supply switching circuit are arranged on the outdoor machine side, under the condition that the zero line of the indoor machine is communicated with the zero and fire wire communication module, the current flow direction is controlled to start, the inner and outer machine zero and fire wire line sequences are detected, the zero and fire wire communication module on the outdoor machine side is communicated through the zero and fire wire power supply switching circuit according to the detection result, the problem caused by zero and fire wire connection is eliminated, and the installation efficiency is improved.

In summary, it is readily understood by those skilled in the art that the above-described advantageous ways can be freely combined and superimposed without conflict.

The above description is only an example of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The zero-live wire line sequence conditioning device of the air conditioner is characterized by comprising an inner machine and an outer machine; an internal machine communication module is arranged on the internal machine side; an external machine communication module is arranged on the external machine side; the power cord of interior machine includes: the first power line of the internal machine and the second power line of the internal machine; the power cord of outer machine includes: the external machine first power line and the external machine second power line; the external machine is provided with a first zero-live wire communication power supply and a second zero-live wire communication power supply; the communication current loop can be formed by connecting a power line with a communication line between the outer machine communication module and the inner machine communication module;

zero live wire line preface of air conditioner is prepared device includes: an inner machine zero-live wire reverse connection identification and alignment unit, an inner machine line sequence identification auxiliary unit and an outer machine line sequence identification and alignment unit;

the internal machine zero-live wire reverse connection identification and adjustment unit is configured to identify zero wires in the internal machine first power wire and the internal machine second power wire, and enable connection wires between the zero wires in the internal machine first power wire and the internal machine second power wire and the internal machine communication module to be connected, so that the zero wires in the internal machine first power wire and the internal machine second power wire are connected into the communication current loop;

the internal and external machine line sequence identification auxiliary unit is configured to connect a power supply line where a zero line in the internal machine first power supply line and the internal machine second power supply line is located with a power supply line where the zero line in the internal machine first power supply line and the internal machine second power supply line is located with a corresponding external machine power supply line in the external machine first power supply line and the external machine second power supply line under the condition that the zero line in the internal machine first power supply line and the internal machine second power supply line is connected into the communication current loop, so as to connect the power supply line where the internal machine supplies power to the external machine;

the external machine line sequence identification and alignment unit is configured to identify current flow directions of a first power line of the external machine and a second power line of the external machine under the condition that a power supply line for supplying power to the external machine by the internal machine is connected, and select connection lines between corresponding zero-live wire communication power supplies in the first zero-live wire communication power supply and the second zero-live wire communication power supply and the external machine communication module to be connected so as to connect the corresponding zero-live wire communication power supplies in the first zero-live wire communication power supply and the second zero-live wire communication power supply into the communication current loop;

The indoor unit is powered on, the zero line detection circuit is used for detecting the zero line and the fire wire of the indoor unit, and the zero line and the fire wire communication module is connected through the zero line selection switch; an inner and outer machine line sequence detection module is arranged between an indoor machine and an outdoor machine, a current flow direction detection circuit and a zero and fire wire power supply switching circuit are arranged on the outdoor machine side, under the condition that an indoor machine zero line is connected with a zero and fire wire communication module, the current flow direction is controlled to start, the zero and fire wire line sequence of the indoor machine and the outdoor machine is detected, and the zero and fire wire communication module on the outdoor machine side is connected through the zero and fire wire power supply switching circuit according to a detection result, so that the zero and fire wire sequence of the indoor machine is detected and regulated after the indoor machine is electrified, and the zero and fire wire between the indoor machine, the commercial power and the air conditioner are installed without distinguishing.

2. The device for conditioning the sequence of the zero line and the fire line of an air conditioner according to claim 1, wherein the internal machine zero line reverse connection identification and adjustment unit comprises: a zero line detection module and a zero line selection module; wherein, the liquid crystal display device comprises a liquid crystal display device,

The interior machine zero live wire reverse connection discernment and alignment unit discerns interior machine first power cord with interior machine second power cord in the zero line, and make interior machine first power cord with interior machine second power cord in the zero line with interior machine communication module between the connecting wire switch-on, include:

the zero line detection module is configured to identify a zero line in the first power line of the internal machine and the second power line of the internal machine;

3. The zero line sequence conditioning device of an air conditioner according to claim 2, wherein the zero line detection module comprises: the device comprises a first switch module, a current limiting module, a bidirectional diode module, a capacitor module and a signal acquisition and processing module; wherein, the liquid crystal display device comprises a liquid crystal display device,

taking any one of the first power line of the internal machine and the second power line of the internal machine as an internal machine detection line; the internal machine detection is connected to the first end of the bidirectional diode module and the first end of the capacitor module after passing through the first switch module and the current limiting module, and is connected to the first end of the signal acquisition processing module; the second end of the bidirectional diode module and the second end of the capacitor module are connected to the second end of the signal acquisition processing module; the second end of the bidirectional diode module is also connected with a shell; the third end of the signal acquisition processing module is used as an output end and is used for outputting a zero line detection result to a controller of the air conditioner; the fourth end of the signal acquisition processing module is connected with a direct current power supply;

In the bidirectional diode module, the anode of the first diode is connected with the cathode of the second diode, and the cathode of the first diode is connected with the anode of the second diode; the signal acquisition processing module adopts a differential amplifying circuit;

4. The zero line sequence conditioning device of an air conditioner according to claim 2, wherein the zero line selection module comprises: a first zero line selection branch and a second zero line selection branch; the first power line of the inner machine is connected to the inner machine communication module after passing through the first zero line selection branch, and the second power line of the inner machine is connected to the inner machine communication module after passing through the second zero line selection branch; wherein, the liquid crystal display device comprises a liquid crystal display device,

the first zero line selection branch circuit and the second zero line selection branch circuit have the same structure; the first zero line selection branch circuit comprises: the first diode module, the first protection module and the second switch module; wherein, the liquid crystal display device comprises a liquid crystal display device,

the first power line of the internal machine is connected to the cathode of the diode module; the anode of the first diode module is connected to the internal machine communication module after passing through the first protection module and the second switch module;

5. The apparatus according to claim 1, wherein the inside and outside machine line sequence recognition auxiliary unit comprises: a first auxiliary branch and a second auxiliary branch; the first power line of the internal machine is connected to a first output line through the first auxiliary branch, and the second power line of the internal machine is connected to a second output line through the second auxiliary branch; the first output line can be connected with one external machine power line of the external machine first power line and the external machine second power line; the second output line can be connected with the other external machine power line in the external machine first power line and the external machine second power line; wherein, the liquid crystal display device comprises a liquid crystal display device,

the first auxiliary branch and the second auxiliary branch have the same structure; the first auxiliary branch comprises: a second diode module and a third switch module; the second diode module is connected with the third switch module in parallel; the first power line of the internal machine is connected to the anode of the second diode module; a cathode of the second diode module connected to the first output line;

6. The apparatus according to claim 1, wherein the external machine line sequence recognition and adjustment unit comprises: the current flow direction detection module and the zero fire wire power supply switching module; wherein, the liquid crystal display device comprises a liquid crystal display device,

the external machine line sequence discernment and alignment unit discernment the external machine first power cord with the current flow direction of external machine second power cord, select corresponding zero live wire communication power supply in first zero live wire communication power supply with the second zero live wire communication power supply with connect wire switch-on between the external machine communication module includes:

the current flow direction detection module is configured to identify the current flow direction of the external machine first power line and the external machine second power line;

7. The zero line sequence conditioning device of an air conditioner according to claim 6, wherein the current flow direction detection module comprises: the first resistor module, the second resistor module, the third resistor module, the fourth resistor module, the fifth resistor module and the sixth resistor module, the first electrolytic capacitor module and the second electrolytic capacitor module; wherein, the liquid crystal display device comprises a liquid crystal display device,

a first output terminal of the current flow direction detection structure is a collector electrode of the transistor side of the first optocoupler module; a second output terminal of the current flow direction detection structure is a collector electrode of the transistor side of the second optocoupler module;

the direct current power supply is connected to a collector electrode of a transistor side of the first optical coupler module after passing through the first resistor module, the diode side of the first optical coupler module is connected with the first electrolytic capacitor module and the fourth resistor module in parallel, an anode of the diode side of the first optical coupler module is connected with an anode of the first electrolytic capacitor module and a cathode of the third diode module, and a cathode of the first electrolytic capacitor module is connected with the second power line of the external machine after passing through the sixth resistor module;

The direct current power supply is further connected to a collector electrode of the transistor side of the second optocoupler module after passing through the third resistor module, the diode side of the second optocoupler module is connected with the second electrolytic capacitor module and the fifth resistor module in parallel, a cathode of the diode side of the second optocoupler module is connected with a cathode of the second electrolytic capacitor module and an anode of the fourth diode module, and an anode of the second electrolytic capacitor module is connected with a second power line of the external machine after passing through the sixth resistor module.

8. The zero line sequence conditioning device of an air conditioner according to claim 6, wherein the zero line power switching module comprises: a first identification branch and a second identification branch; the first power line of the external machine is connected to the external machine communication module after passing through the first zero-live wire communication power supply and the first identification branch; the second power line of the external machine is connected to the external machine communication module after passing through the second zero-live wire communication power supply and the second identification branch; wherein, the liquid crystal display device comprises a liquid crystal display device,

the first identification branch and the second identification branch have the same structure; the first identification branch comprises: the second protection module, the fifth diode module and the fourth switch module; the first power line of the external machine is connected with the anode of the fifth diode module after passing through the first zero-live wire communication power supply and the second protection module; and the cathode of the fifth diode module is connected to the external communication module after passing through the fourth switch module.

9. The zero line sequence conditioning device of an air conditioner according to claim 6, wherein the first zero line communication power supply and the second zero line communication power supply have the same structure; the first zero live wire communication power supply comprises: the voltage stabilizing module, the third electrolytic capacitor module and the sixth diode module; the external machine first power line is respectively connected to the anode of the voltage stabilizing module and the cathode of the third electrolytic capacitor module; the cathode of the voltage stabilizing module is connected to the anode of the sixth diode module; and the cathode of the sixth diode module is connected with the anode of the third electrolytic capacitor module and is connected to the zero-live wire power supply switching module.

10. A control method of the zero line sequence conditioning device of an air conditioner according to any one of claims 1 to 9, comprising:

the method comprises the steps of controlling an inner machine zero-live wire reverse connection identification and alignment unit, identifying zero wires in a first inner machine power wire and a second inner machine power wire, and enabling a connecting wire between the zero wires in the first inner machine power wire and the second inner machine power wire and the inner machine communication module to be connected so as to enable the zero wires in the first inner machine power wire and the second inner machine power wire to be connected into the communication current loop;

The method comprises the steps of controlling an inner machine line sequence identification auxiliary unit, and connecting a power supply line where a zero line in an inner machine first power line and the zero line in an inner machine second power line is positioned with a corresponding outer machine power supply line in an outer machine first power line and the outer machine second power line under the condition that the zero line in the inner machine first power line and the inner machine second power line is connected into the communication current loop, so as to connect the power supply line where the inner machine supplies power to the outer machine;

the method comprises the steps of controlling an external machine line sequence identification and alignment unit, identifying the current flow directions of a first power line of the external machine and a second power line of the external machine under the condition of connecting a power supply line of an internal machine for supplying power to the external machine, selecting a connecting line between a corresponding zero-live wire communication power supply in the first zero-live wire communication power supply and the second zero-live wire communication power supply and an external machine communication module, and connecting the corresponding zero-live wire communication power supplies in the first zero-live wire communication power supply and the second zero-live wire communication power supply into a communication current loop.