CN114400659A

CN114400659A - Zero-live wire self-adjusting circuit and method and air conditioner

Info

Publication number: CN114400659A
Application number: CN202210039122.6A
Authority: CN
Inventors: 梁尚; 龙运祥; 陈伟明
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-01-13
Filing date: 2022-01-13
Publication date: 2022-04-26

Abstract

The embodiment of the invention provides a zero-live wire self-adjusting circuit, a method and an air conditioner, wherein the zero-live wire self-adjusting circuit comprises the following components: the zero line detection module, the zero line selection switch module, the MCU and the switch driving module; the first power wire is connected with the first end of the zero line detection module, the first power wire is connected with the first end of the zero line selection switch module, the second power wire is connected with the second end of the zero line selection switch module, and the third end of the zero line selection switch module is connected with the zero line communication module; the second end of the zero line detection module is grounded, the third end of the zero line detection module is connected with the first end of the MCU, the second end of the MCU is connected with the first end of the switch driving module, and the second end of the switch driving module is connected with the fourth end of the zero line selection switch module. Through the mutual cooperation of the zero line detection module, the zero line selection switch module, the MCU and the switch driving module, the zero line can be detected and the zero line communication module can be accessed, so that the zero line and the live line do not need to be distinguished in indoor and outdoor installation.

Description

Zero-live wire self-adjusting circuit and method and air conditioner

Technical Field

The embodiment of the invention relates to the technical field of household appliances, in particular to a zero-live line self-adjusting circuit and method and an air conditioner.

Background

With the development of economy, various household appliances gradually enter families of people at present. Among them, air conditioners are widely used by people as a kind of home appliances. Most of today's air conditioners are generally composed of an indoor unit and an outdoor unit, which 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 operating conditions, which requires frequent communication between the indoor unit and the outdoor unit.

Since the indoor unit and the outdoor unit are far apart from each other and have much interference, in order to ensure the reliability of communication between the indoor unit and the outdoor unit, a three-wire system is generally used as a communication method between the indoor unit and the outdoor unit. The three-wire system is characterized in that a connecting wire between the indoor unit and the outdoor unit comprises a zero wire, a live wire and a communication wire, so that half-duplex asynchronous serial port communication is formed, communication between the indoor unit and the outdoor unit is realized, and the communication is safe, reliable and low in cost.

In the related art, an indoor unit of an outdoor unit generally provides a mains supply, but a zero line and a live line of the outdoor unit are reversely connected in an installation process, so that a communication circuit between the indoor unit and the outdoor unit cannot form a current loop, a communication fault between the indoor unit and the outdoor unit is caused, an air conditioner cannot be normally started, the fault needs to be checked, the positions of the zero line and the live line need to be manually adjusted, the installation efficiency of the air conditioner is limited, high-altitude operation is needed during reinstallation, and the operation risk of an installer is increased.

Disclosure of Invention

In order to solve the technical problems that a zero line and a live line of an outdoor unit are reversely connected in the installation process, a communication circuit between the indoor unit and the outdoor unit cannot form a current loop, so that communication faults between the indoor unit and the outdoor unit are caused, an air conditioner cannot be normally started, faults need to be checked, the positions of the zero line and the live line need to be manually adjusted, the installation efficiency of the air conditioner is limited, high-altitude operation is needed during reinstallation, and the operation risk of an installer is increased, the zero line and the live line self-adjusting circuit, the zero line and the live line self-adjusting method and the air conditioner are provided in the embodiment of the invention.

In a first aspect of the embodiments of the present invention, there is provided a zero live line self-adjusting circuit, including: the zero line detection module, the zero line selection switch module, the MCU and the switch driving module;

the first power wire is connected with the first end of the zero line detection module, the first power wire is connected with the first end of the zero line selection switch module, the second power wire is connected with the second end of the zero line selection switch module, and the third end of the zero line selection switch module is connected with the zero-fire communication module;

the second end of the zero line detection module is grounded, the third end of the zero line detection module is connected with the first end of the MCU, the second end of the MCU is connected with the first end of the switch driving module, and the second end of the switch driving module is connected with the fourth end of the zero line selection switch module.

In an alternative embodiment, the neutral line selection switch module includes: a first switch and a second switch;

one end of the first switch is connected with the first power supply lead, one end of the second switch is connected with the second power supply lead, and the other end of the first switch and the other end of the second switch are connected into the zero-fire communication module.

In an optional embodiment, the neutral line selection switch module further includes: a first resistor, a second resistor and a third resistor;

the one end of first resistance is connected first power wire, the one end of second resistance is connected second power wire, the other end of first resistance is connected the one end of first switch, the other end of second resistance is connected the one end of second switch, the other end of first switch with the other end of second switch all connect in the one end of third resistance, the other end of third resistance inserts zero fire communication module.

In an optional embodiment, the neutral line selection switch module further includes: a first diode and a second diode;

one end of the first diode is connected with the other end of the first resistor, the other end of the first diode is connected with one end of the first switch, one end of the second diode is connected with the other end of the second resistor, and the other end of the second diode is connected with one end of the second switch.

In an optional embodiment, the zero live line self-adjusting circuit further comprises: a switching power supply module;

the first power supply wire is connected with a first input end of the switch power supply module, the second power supply wire is connected with a second input end of the switch power supply module, a first output end of the switch power supply module is connected with a first end of the zero-fire communication module, and a second output end of the switch power supply module is connected with a second end of the zero-fire communication module.

In an optional embodiment, the zero live line self-adjusting circuit further comprises: the circuit comprises a strong current filtering module, a rectifier bridge module and a first capacitor;

the first power supply lead is connected with a first input end of the strong current filter module, a first output end of the strong current filter module is connected with a first input end of the rectifier bridge module, and a first output end of the rectifier bridge module is connected with a first input end of the switch power supply module;

the second power supply lead is connected with a second input end of the strong current filter module, a second output end of the strong current filter module is connected with a second input end of the rectifier bridge module, and a second output end of the rectifier bridge module is connected with a second input end of the switch power supply module;

the first output end of the strong electric filter module is connected with the first end of the zero line detection module, the first output end of the strong electric filter module is connected with the first end of the zero line selection switch module, and the second output end of the strong electric filter module is connected with the second end of the zero line selection switch module;

the first capacitor is arranged between the first output end of the rectifier bridge module and the second output end of the rectifier bridge module.

In an alternative embodiment, the switching power supply module includes: the primary winding, the secondary winding, the third switch, the third diode and the second capacitor;

a first output end of the rectifier bridge module is connected with a first input end of the primary winding, a second output end of the rectifier bridge module is connected with one end of a third switch, and the other end of the third switch is connected with a second input end of the primary winding;

the first output end of the secondary winding is connected with one end of the third diode, the other end of the third diode is connected with the first end of the zero-fire communication module, and the second output end of the secondary winding is connected with the second end of the zero-fire communication module;

and the second capacitor is arranged between the other end of the third diode and the second output end of the secondary winding.

In a second aspect of embodiments of the present invention, there is provided an air conditioner including the zero line and live line self-adjusting circuit of any one of the first aspect described above.

In a third aspect of the embodiments of the present invention, there is provided a zero fire line self-adjusting method, including:

if the zero line detection module detects that the first power supply lead is a live line, the MCU controls the switch driving module to adjust the zero line selection switch module, and the second power supply lead is used as a zero line to be connected to the zero line communication module;

if the first power supply wire is detected to be a zero wire by the zero wire detection module, the MCU controls the switch driving module to adjust the zero wire selection switch module, and the first power supply wire is connected to the zero wire communication module.

In an optional embodiment, if the zero line detection module detects that the first power supply conductor is a live line, the method includes:

if the output signal of the third end of the zero line detection module is low level, detecting that the first power supply lead is a live wire;

if the zero line detection module detects that the first power supply wire is the zero line, the method comprises the following steps:

and if the output signal of the third end of the zero line detection module is high level, detecting that the first power supply wire is the zero line.

In an optional implementation manner, the MCU controls the switch driving module to adjust the zero line selection switch module, and the second power supply wire is connected to the zero line communication module as a zero line, including:

the MCU controls the switch driving module to close a first switch in the zero line selection switch module, and a second power supply lead is connected to the zero line communication module;

MCU control switch drive module adjustment zero line selection switch module inserts the zero fire communication module with first power wire, includes:

and the MCU controls the switch driving module to close a second switch in the zero line selection switch module, and a first power supply wire is connected to the zero line communication module.

The zero line and live line self-adjusting circuit provided by the embodiment of the invention comprises a zero line detection module, a zero line selection switch module, an MCU and a switch driving module, wherein a first power supply lead is connected with a first end of the zero line detection module, the first power supply lead is connected with a first end of the zero line selection switch module, a second power supply lead is connected with a second end of the zero line selection switch module, a third end of the zero line selection switch module is connected with a zero line communication module, a second end of the zero line detection module is grounded, a third end of the zero line detection module is connected with a first end of the MCU, a second end of the MCU is connected with a first end of the switch driving module, and a second end of the switch driving module is connected with a fourth end of the zero line selection switch module. Through zero line detection module, zero line selection switch module, MCU, mutually supporting of switch drive module, can detect out the zero line and insert zero fire communication module, can make indoor outer installation need not distinguish zero live wire, can guarantee equally that communication circuit between indoor set and the off-premises station can't constitute the current loop, make the communication between indoor set and the off-premises station normal, guarantee the air conditioner and normally start, need not to investigate the trouble, avoid artifical adjustment zero line, the live wire position, the air conditioner installation degree of difficulty has been reduced, the installation effectiveness has been improved, avoid reinstallation to guarantee installer's safety.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a three-wire system zero-fire communication schematic diagram of a conventional air conditioner indoor and outdoor unit shown in the embodiment of the present invention;

fig. 2 is a schematic diagram of a conventional outdoor unit of an air conditioner for reverse connection of a zero line and a fire line according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a strong power supply filtering and rectifying circuit of an air conditioner external unit according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a zero-live line self-adjusting circuit according to an embodiment of the present invention;

fig. 5 is a schematic diagram illustrating a zero-fire communication adjustment of an air conditioner outdoor unit according to an embodiment of the present invention;

fig. 6 is a schematic diagram illustrating adjustment of zero-fire communication of an air conditioner outdoor unit according to another embodiment of the present invention;

fig. 7 is a schematic diagram illustrating adjustment of zero-fire communication of an air conditioner outdoor unit according to another embodiment of the present invention;

fig. 8 is a schematic structural diagram of another zero-line and live-line self-adjusting circuit shown in the embodiment of the present invention;

fig. 9 is a schematic structural diagram of another zero-line and live-line self-adjusting circuit shown in the embodiment of the present invention;

fig. 10 is a schematic structural diagram of a switching power supply module according to an embodiment of the present invention;

fig. 11 is a schematic diagram of a commercial power-to-home connection of a user in the embodiment of the present invention;

FIG. 12 is a schematic diagram of a neutral detection module according to an embodiment of the present invention;

fig. 13 is a schematic structural view of an air conditioner according to an embodiment of the present invention;

fig. 14 is a schematic flow chart of an implementation of a zero-fire self-adjusting method according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Currently, the indoor unit and the outdoor unit are far apart and have a lot of interference, and in order to ensure the reliability of communication between the indoor unit and the outdoor unit, a three-wire system is generally adopted as a communication method between the indoor unit and the outdoor unit, as shown in fig. 1.

The air conditioner indoor and outdoor unit forms a communication current loop through a zero line (N) and a communication line (COM), and the current limiting function of a resistor, the unidirectional conductivity of a diode and the voltage clamping function of a Zener diode in the loop protect an optical coupler in the loop, so that the stable operation of communication is ensured.

The outdoor unit provides power for zero-live line communication, and the communication power supply shown in fig. 1 is powered by zero-live line voltage division. When the zero line and the live line are connected in reverse, as shown in fig. 2, although the zero line and the live line can be used for charging the communication power supply, a loop cannot be formed with the communication circuit, so that the reverse connection of the zero line and the live line can cause the zero line communication function to fail, and further cause the air conditioner to be incapable of working normally.

In addition, as shown in fig. 3, after the zero-live line of the air conditioner external unit is wired, the full-wave rectification is performed through the protection circuit, the filter circuit and the rectifier bridge, the stable direct current is formed after the filtering is performed through the large-capacity electrolytic capacitor, and different voltage sources are provided for the air conditioner external unit through the switching power supply.

According to the above: (1) the power supply part of the outdoor unit of the air conditioner in the figure 3 is an AC-DC converter, alternating current does not directly supply power for high-power devices of the outdoor unit of the air conditioner, and a controller power supply, a cooling fan, a compressor and the like in the outdoor unit all need direct current power supply. (2) The alternating current only supplies power for the zero-fire communication circuit.

In the above, the connection of the null line and the anti-connection of the null line have no influence on the operation of other functions except that the communication function has special requirements on the connection of the null line and the anti-connection of the null line.

In conclusion, the power supply zero-fire wire of the zero-fire communication module of the air conditioner outdoor unit is correctly connected. On the premise of the theory, the invention is provided:

namely, the zero line and the live line of the air conditioner external unit are not divided into positive and negative lines; and screening out the zero line through a special circuit, and connecting the screened out zero line into a zero-fire communication loop.

Based on the above, as shown in fig. 4, a schematic structural diagram of a zero live line self-adjusting circuit (40) provided in an embodiment of the present invention is provided, where the zero live line self-adjusting circuit (40) specifically includes: the zero line detection module (41), the zero line selection switch module (42), the MCU (43) and the switch driving module (44).

The first power wire (45) is connected with the first end of the zero line detection module (41), the first power wire (45) is connected with the first end of the zero line selection switch module (42), the second power wire (46) is connected with the second end of the zero line selection switch module (42), and the third end of the zero line selection switch module (42) is connected with the zero-fire communication module (47), namely, is connected with the negative electrode of the zero-fire communication module (47).

The second end of the zero line detection module (41) is grounded, the third end of the zero line detection module (41) is connected with the first end of the MCU (43), the second end of the MCU (43) is connected with the first end of the switch driving module (44), and the second end of the switch driving module (44) is connected with the fourth end of the zero line selection switch module (42).

Through zero line detection module (41), zero line selection switch module (42), MCU (43), mutually supporting of switch drive module (44), can detect out the zero line and insert zero fire communication module (47), can make indoor outer installation need not distinguish zero live wire, can guarantee equally that communication circuit between indoor set and the off-premises station can't constitute the current loop, make communication between indoor set and the off-premises station normal, guarantee the air conditioner normal start, need not to investigate the trouble, avoid manual adjustment zero line, the live wire position, the air conditioner installation degree of difficulty has been reduced, the installation effectiveness is improved, avoid reinstallating and guaranteed installer's safety.

In an embodiment of the invention, the selection switch module (42) comprises, for the neutral line: a first switch (421) and a second switch (422), as shown in fig. 5, one end of the first switch (421) is connected to the first power supply wire (45), one end of the second switch (422) is connected to the second power supply wire (46), and the other ends of the first switch (421) and the second switch (422) are connected to the zero fire communication module (47), i.e. connected to the negative electrode of the zero fire communication module (47).

In an embodiment of the invention, the zero line selection switch module (42) further comprises: first resistance (423), second resistance (424) and third resistance (425), as shown in fig. 6, first power wire (45) is connected to the one end of first resistance (423), second power wire (46) is connected to the one end of second resistance (424), the one end of first switch (421) is connected to the other end of first resistance (423), the one end of second switch (422) is connected to the other end of second resistance (424), the other end of first switch (421) and the other end of second switch (422) all connect in the one end of third resistance (425), the other end of third resistance (425) inserts zero fire communication module (47), connect the negative pole of zero fire communication module (47) promptly.

The first switch (421) and the second switch (422) are both controllable switches, and the zero line can be selected through the first switch (421) and the second switch (422). After the outdoor unit is installed, the zero-live line sequence is not changed any more, so that only one switch is controlled to act and the other switch never acts after the installation is finished and the zero-live line of the outdoor unit is not manually exchanged. However, the switch has the possibility of misoperation, so a protection circuit is arranged, namely the protection circuit comprises a first resistor (423), a second resistor (424) and a third resistor (425), wherein the three resistors are all protection voltage division resistors, and the protection circuit plays a role in current limiting protection and plays a role in current limiting in the communication process when the selection switch has misoperation and the diode has fault and misconduction.

In an embodiment of the invention, the zero line selection switch module (42) further comprises: as shown in fig. 7, one end of the first diode (426) is connected to the other end of the first resistor (423), the other end of the first diode (426) is connected to one end of the first switch (421), one end of the second diode (427) is connected to the other end of the second resistor (424), and the other end of the second diode (427) is connected to one end of the second switch (422).

The first switch (421) and the second switch (422) are both controllable switches, and the zero line can be selected through the first switch (421) and the second switch (422). After the outdoor unit is installed, the zero-live line sequence is not changed any more, so that only one switch is controlled to act and the other switch never acts after the installation is finished and the zero-live line of the outdoor unit is not manually exchanged. However, the switch has the possibility of misoperation, so the protection circuit is arranged, namely the protection circuit also comprises a first diode (426) and a second diode (427), and the unidirectional conductivity of the diodes can prevent the zero line and the live line from being shorted so as to play a role in protection.

In the embodiment of the invention, the self-adjusting circuit (40) for the zero line and the live line further comprises: the switching power supply module (48), as shown in fig. 8, the first power wire (45) is connected to the first input end of the switching power supply module (48), the second power wire (46) is connected to the second input end of the switching power supply module (48), the first output end of the switching power supply module (48) is connected to the first end of the zero-fire communication module (47), i.e., to the anode of the zero-fire communication module (47), and the second output end of the switching power supply module (48) is connected to the second end of the zero-fire communication module (47), i.e., to the cathode of the zero-fire communication module (47).

In the embodiment of the invention, the self-adjusting circuit (40) for the zero line and the live line further comprises: as shown in fig. 9, the first power line (45) is connected to a first input terminal of the strong power filter module (49), a first output terminal of the strong power filter module (49) is connected to a first input terminal of the rectifier bridge module (50), and a first output terminal of the rectifier bridge module (50) is connected to a first input terminal of the switching power module (48). The second power supply lead (46) is connected with a second input end of the strong current filtering module (49), a second output end of the strong current filtering module (49) is connected with a second input end of the rectifier bridge module (50), and a second output end of the rectifier bridge module (50) is connected with a second input end of the switching power supply module (48). The first output end of the strong current filter module (49) is connected with the first end of the zero line detection module (41), the first output end of the strong current filter module (49) is connected with the first end of the zero line selection switch module (42), and the second output end of the strong current filter module (49) is connected with the second end of the zero line selection switch module (42). A first capacitor (51) is arranged between the first output end of the rectifier bridge module (50) and the second output end of the rectifier bridge module (50).

In an embodiment of the invention, the switching power supply module (48) comprises: a primary winding (481), a secondary winding (482), a third switch (483), a third diode (484), and a second capacitor (485), as shown in fig. 10, a first output terminal of the rectifier bridge module (50) is connected to a first input terminal of the primary winding (481), a second output terminal of the rectifier bridge module (50) is connected to one end of the third switch (483), and the other end of the third switch (483) is connected to a second input terminal of the primary winding (481). The first output end of the secondary winding (482) is connected with one end of a third diode (484), the other end of the third diode (484) is connected with the first end of the zero fire communication module (47), namely the anode of the zero fire communication module (47), and the second output end of the secondary winding (482) is connected with the second end of the zero fire communication module (47), namely the cathode of the zero fire communication module (47). A second capacitor (485) is arranged between the other end of the third diode (484) and the second output end of the secondary winding (482).

It should be noted that, as shown in fig. 10, the alternating current is full-wave rectified by the bridge rectifier module (50), filtered by the electrolytic capacitor, and then enters the primary winding (481) of the switching power supply module (48), the secondary winding 1 supplies power to other circuits on the controller (the part is divided into a plurality of winding loops, only one group is mentioned here), and the secondary winding 2 supplies power to the zero-fire communication circuit separately. The high-frequency working mode of the switching power supply module (48) enables the output voltage ripple to be smaller, the output is more stable, the communication stability is better, the live wire does not participate in the connection of the circuit completely, and the circuit safety is improved.

In the embodiment of the present invention, as shown in fig. 11, the three-phase high voltage is transformed into single-phase 220V commercial power through a transformer, wherein the zero line (N) is connected to the ground, and the housing (PE) of the consumer is connected to the ground, so that the zero line (N) and the housing (PE) are equipotential. And a potential difference exists between the live wire (L) and the shell (PE), and a potential difference does not exist between the zero line (N) and the shell (PE). According to the characteristic principle, the zero line and the live line can be distinguished. Wherein, COM is a communication line.

According to the above principle, an embodiment of the present invention provides a zero line detection module (41), which may specifically include a diode D, a resistor Rp, a capacitor C, a resistor R, a resistor Rm, and an optical coupler, where a connection relationship between the diode D, the resistor Rp, the capacitor C, the resistor R, the resistor Rm, and the optical coupler is as shown in fig. 12.

Wherein, the port L (N) is an input port to be detected; the diode D plays a role of half-wave rectification and charges the capacitor C; rp and R are divider resistors; c is an electrolyte capacitor which plays a role in energy storage and voltage stabilization; the optical coupler plays a role in isolation protection, and Rm is a matching resistor; the port e outputs a detection result signal.

In fig. 12, a diode D performs half-wave rectification to provide a positive voltage for a following circuit, and outputs a relatively stable and continuous dc signal to a position between

pins

1 and 2 of the optocoupler through the functions of a voltage dividing resistor R and a filter capacitor C. If the

pins

1 and 2 of the optical coupler are conducted, the

pins

3 and 4 are conducted, a low-resistance state is presented, and the short circuit is regarded as a short circuit; and when the

pins

1 and 2 of the optical coupler are cut off, the

pins

3 and 4 are cut off, and the high-resistance state is presented, so that the circuit is regarded as open circuit. If the input port is zero line (N), because the electromotive force between zero line (N) and casing (PE) is zero, divider resistance R both ends voltage is zero, and the voltage between opto-

coupler pin

1, 2 is zero, and opto-coupler isolator is out of work, presents the high resistance state between opto-coupler 3, the 4 feet, is equivalent to open a circuit, and e lasts the output high level.

If input port is live wire (L), because the potential difference that exists between zero line (L) and casing (PE), divider resistance R both ends voltage is not for zero, switches on between opto-

coupler pin

1, 2, and opto-coupler isolator begins work, presents the low resistance state between opto-coupler 3, the 4 feet, is equivalent to the short circuit, and e lasts the output low level.

In an embodiment of the present invention, an air conditioner (130) is provided, and the air conditioner (130) may include any one of the above-mentioned zero line and live line self-adjusting circuits (40), as shown in fig. 13.

As shown in fig. 14, an implementation flow diagram of a zero fire line self-adjusting method provided in an embodiment of the present invention specifically includes the following steps:

s1401, if the zero line detection module (41) detects that the first power supply lead (45) is a live line, the MCU (43) controls the switch driving module (44) to adjust the zero line selection switch module (42), and the second power supply lead (46) is used as a zero line to be connected into the zero line communication module (47).

In the embodiment of the invention, after the wiring is finished, the power supply starts to be powered on, and the switching power supply module (48) starts to work to supply power for the MCU (43) and the peripheral control circuit thereof. At this time, the system is powered on, and firstly, the zero line detection module (41) detects whether the first power supply lead (45) is the zero line.

If the output signal of the third end of the zero line detection module (41) is low level, namely the output e signal of the zero line detection module (41) is low level, the first power wire (45) is detected to be live wire, the second power wire (46) is indicated to be zero line, the MCU (43) controls the switch driving module (44) to adjust the zero line selection switch module (42), and the second power wire (46) is used as the zero line to be connected into the zero line communication module (47), namely connected with the negative electrode of the zero line communication module (47).

The MCU (43) controls the switch driving module (44) to close a first switch (421) in the zero line selection switch module (42), and a second power supply lead (46) is connected to the zero-fire communication module (47), namely, is connected with the negative electrode of the zero-fire communication module (47). Thus the zero fire adjustment process is ended. And after the communication power supply is charged, the communication is carried out on the indoor unit, the first power supply lead (45) is reported to be the live wire, and the second power supply lead (46) is reported to be the zero wire.

S1402, if the zero line detection module (41) detects that the first power supply lead (45) is the zero line, the MCU (43) controls the switch driving module (44) to adjust the zero line selection switch module (42) and connects the first power supply lead (45) to the zero line communication module (47).

If the output signal of the third end of the zero line detection module (41) is high level, namely the output e signal of the zero line detection module (41) is high level, the first power wire (45) is detected to be the zero line, the MCU (43) controls the switch driving module (44) to adjust the zero line selection switch module (42), and the first power wire (45) is connected to the zero-fire communication module (47), namely the negative electrode of the zero-fire communication module (47) is connected.

The MCU (43) controls the switch driving module (44) to close a second switch (422) in the zero line selection switch module (42), and the first power supply lead (45) is connected to the zero-fire communication module (47), namely, the negative electrode of the zero-fire communication module (47) is connected. Thus the zero fire adjustment process is ended. And after the communication power supply is charged, the communication is carried out on the indoor unit, and the first power supply wire (45) is reported to be a zero line to the indoor unit.

In the above, the zero-live line adjustment work of the zero-live line communication module (47) is finished, and only one zero-live line adjustment is performed after power is turned on, which is not limited in the embodiment of the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A line zero self-tuning circuit, comprising: the zero line detection module, the zero line selection switch module, the MCU and the switch driving module;

2. The zero line self-adjusting circuit according to claim 1, wherein the zero line selection switch module comprises: a first switch and a second switch;

3. The zero line self-adjusting circuit according to claim 2, wherein the zero line selection switch module further comprises: a first resistor, a second resistor and a third resistor;

4. The zero line self-adjusting circuit of claim 3, wherein the zero line selector switch module further comprises: a first diode and a second diode;

5. The zero line and live line self-adjusting circuit according to any one of claims 1 to 4, further comprising: a switching power supply module;

6. The zero line and live line self-adjusting circuit of claim 5, further comprising: the circuit comprises a strong current filtering module, a rectifier bridge module and a first capacitor;

7. The zero line and live line self-adjusting circuit of claim 5, wherein the switching power supply module comprises: the primary winding, the secondary winding, the third switch, the third diode and the second capacitor;

8. An air conditioner characterized by comprising the zero fire line self-adjusting circuit of any one of claims 1 to 7.

9. A method of zero fire line self-tuning, the method comprising:

10. The method of claim 9, wherein the detecting the first power conductor as the hot conductor by the neutral detection module comprises:

11. The method of claim 9, wherein the MCU controls the switch driver module to adjust the zero line selection switch module to switch the second power conductor as a zero line to the zero line communication module, comprising: