CN114389259A

CN114389259A - Zero-live wire self-adjusting circuit and method and air conditioner

Info

Publication number: CN114389259A
Application number: CN202210038248.1A
Authority: CN
Inventors: 梁尚; 吉焕基; 孟凡奥; 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: 2022-04-22

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 first power supply lead is connected with the first end of the reversing switch module, the second power supply lead is connected with the first end of the zero-live wire detection module and the second end of the reversing switch module, the third end of the zero-live wire detection module is connected with the first end of the MCU, and the second end of the MCU is connected with the first end of the communication module; the third end of the MCU is connected with the first end of the switch driving module, the second end of the switch driving module is connected with the third end of the reversing switch module, and the fourth end of the reversing switch module is respectively connected with the second end of the communication module and the first end of the switching power supply module; the fifth end of the reversing switch module is connected with the second end of the switching power supply module, the third end of the switching power supply module is connected with the first end of the switch driving controllable power supply module, the second end of the switch driving controllable power supply module is connected with the third end of the switch driving module, and the third end of the switch driving controllable power supply module is connected with the fourth end of the MCU.

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 device comprises a zero-live wire detection module, an MCU (microprogrammed control unit), a communication module, a switch driving module, a reversing switch module, a switch power supply module and a switch driving controllable power supply module;

a first power supply lead is connected with a first end of the reversing switch module, a second power supply lead is respectively connected with a first end of the zero-live wire detection module and a second end of the reversing switch module, the second end of the zero-live wire detection module is grounded, a third end of the zero-live wire detection module is connected with a first end of the MCU, and the second end of the MCU is connected with a first end of the communication module;

the third end of the MCU is connected with the first end of the switch driving module, the second end of the switch driving module is connected with the third end of the reversing switch module, the fourth end of the reversing switch module is respectively connected with the second end of the communication module and the first end of the switch power supply module, and the third end of the communication module is connected with a third communication wire;

the fifth end of the reversing switch module is connected with the second end of the switch power supply module, the third end of the switch power supply module is connected with the first end of the switch driving controllable power supply module, the second end of the switch driving controllable power supply module is connected with the third end of the switch driving module, and the third end of the switch driving controllable power supply module is connected with the fourth end of the MCU.

In an alternative embodiment, the reversing switch module includes a first switch, a second switch, a third switch, and a fourth switch;

the first end of the reversing switch module is connected with one end of the first switch, and the other end of the first switch is connected with the fifth end of the reversing switch module;

the second end of the reversing switch module is connected with one end of the second switch, and the other end of the second switch is connected with the fourth end of the reversing switch module;

the first end of the reversing switch module is connected with one end of the third switch, and the other end of the third switch is connected with the fourth end of the reversing switch module;

and the second end of the reversing switch module is connected with one end of the fourth switch, and the other end of the fourth switch is connected with the fifth end of the reversing switch module.

In an alternative embodiment, the first switch and the second switch each comprise a normally closed controllable switch, and the third switch and the fourth switch each comprise a normally open controllable switch.

In an alternative embodiment, the switch-driven controllable power supply module comprises a fifth switch;

one end of the fifth switch is connected with the first end of the switch driving controllable power supply module, and the other end of the fifth switch is connected with the second end of the switch driving controllable power supply module.

In an alternative embodiment, the fifth switch comprises a normally open controllable switch.

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

the fourth end of the reversing switch module is connected with the first end of the rectifier bridge module, and the fifth end of the reversing switch module is connected with the second end of the rectifier bridge module;

the third end of the rectifier bridge module is connected with the first end of the switching power supply module, and the fourth end of the rectifier bridge module is connected with the second end of the switching power supply module;

and the capacitor is arranged between the third end of the rectifier bridge module and the fourth end of the rectifier bridge module.

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-live wire detection module detects that the zero-live wire is normally connected, the MCU reports the normal connection of the zero-live wire to the indoor unit;

if the zero-live wire detection module detects that the zero-live wire is abnormal in wiring, the MCU controls the switch to drive the controllable power supply module to supply power to the reversing switch module and the switch driving module, controls the reversing switch module and accesses the zero wire into the communication module.

In an optional embodiment, if the zero-live wire detection module detects that the zero-live wire connection is normal, the MCU reports that the zero-live wire connection is normal to the indoor unit, including:

if the output signal of the third end of the zero-live wire detection module is at a high level, the MCU determines that the zero-live wire is normally wired, keeps the fifth switch in a normally open state, keeps the first switch and the second switch in a normally closed state, and reports that the zero-live wire is normally wired to the indoor unit, wherein the third switch and the fourth switch are in a normally open state.

In an optional implementation manner, if the zero-live wire detection module detects that the zero-live wire is connected abnormally, the MCU controls the switch to drive the controllable power module to supply power to the reversing switch module and the switch driving module, and controls the reversing switch module to connect the zero line to the communication module, including:

and if the output signal of the third end of the zero-live wire detection module is at a low level, the MCU determines that the zero-live wire is abnormal in wiring, controls the fifth switch to be closed, supplies power to the reversing switch module and the switch driving module, controls the first switch and the second switch to be disconnected, controls the third switch and the fourth switch to be closed after delaying preset time, and accesses the zero wire into the communication module.

The zero-live wire self-adjusting circuit provided by the embodiment of the invention comprises a zero-live wire detection module, an MCU, a communication module, a switch driving module, a reversing switch module, a switch power module and a switch driving controllable power module, wherein a first power lead is connected with a first end of the reversing switch module, a second power lead is respectively connected with a first end of the zero-live wire detection module and a second end of the reversing switch module, the second end of the zero-live wire detection module is grounded, a third end of the zero-live wire detection module is connected with a first end of the MCU, the second end of the MCU is connected with a first end of the communication module, a third end of the MCU is connected with a first end of the switch driving module, the second end of the switch driving module is connected with a third end of the reversing switch module, a fourth end of the reversing switch module is respectively connected with a second end of the communication module and a first end of the switch power module, and the third end of the communication module is connected with a third communication lead, the fifth end of the reversing switch module is connected with the second end of the switching power supply module, the third end of the switching power supply module is connected with the first end of the switch driving controllable power supply module, the second end of the switch driving controllable power supply module is connected with the third end of the switch driving module, and the third end of the switch driving controllable power supply module is connected with the fourth end of the MCU. Through zero line detection module, the reversing switch module, MCU, switch drive module, mutually supporting of switch power module and switch drive controllable power module, can detect out zero line and access communication module, can make indoor outer installation need not distinguish zero line, can guarantee equally that communication circuit between indoor set and the off-premises station constitutes the current loop, make the communication between indoor set and the off-premises station normal, guarantee the normal start of air conditioner, 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, installation effectiveness is improved, avoid reinstallating and 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 structural diagram of a reversing switch module in a normal connection condition according to an embodiment of the invention;

fig. 6 is a schematic structural diagram of a switch-driven controllable power module according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of another zero-line and live-line self-adjusting circuit shown in the embodiment of the present invention;

fig. 8 is a schematic diagram of a subscriber's commercial power line-to-the-home connection shown in the embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a zero line and live line detection module shown in an embodiment of the present invention;

fig. 10 is a schematic structural view of an air conditioner according to an embodiment of the present invention;

fig. 11 is a schematic flow chart of an implementation of a zero-fire self-adjusting method according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a reversing switch module in the case of abnormal connection in the embodiment of the present invention;

fig. 13 is a schematic structural diagram of a reversing switch module in the case of abnormal connection shown in the 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 device comprises a zero-live wire detection module (41), an MCU (42), a communication module (43), a switch driving module (44), a reversing switch module (45), a switch power supply module (46) and a switch driving controllable power supply module (47).

The first power supply conducting wire (48) is connected with the first end of the reversing switch module (45), the second power supply conducting wire (49) is connected with the first end of the zero-live wire detection module (41) and the second end of the reversing switch module (45) respectively, the second end of the zero-live wire detection module (41) is grounded, the third end of the zero-live wire detection module (41) is connected with the first end of the MCU (42), and the second end of the MCU (42) is connected with the first end of the communication module (43).

The third end of the MCU (42) is connected with the first end of the switch driving module (44), the second end of the switch driving module (44) is connected with the third end of the reversing switch module (45), the fourth end of the reversing switch module (45) is respectively connected with the second end of the communication module (43) and the first end of the switch power supply module (46), and the third end of the communication module (43) is connected with the third communication lead (50).

The fifth end of the reversing switch module (45) is connected with the second end of the switch power supply module (46), the third end of the switch power supply module (46) is connected with the first end of the switch driving controllable power supply module (47), the second end of the switch driving controllable power supply module (47) is connected with the third end of the switch driving module (44), and the third end of the switch driving controllable power supply module (47) is connected with the fourth end of the MCU (42).

Through zero live wire detection module (41), reversing switch module (45), MCU (42), switch drive module (44), mutually supporting of switching power supply module (46) and switch drive controllable power supply module (47), can detect out the zero line and insert 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 constitutes current loop, make the communication between indoor set and the off-premises station normal, guarantee the normal start-up of air conditioner, 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, installation effectiveness is improved, avoid the reinstallation to guarantee installer's safety.

In the embodiment of the invention, the reversing switch module (45) comprises a first switch (451), a second switch (452), a third switch (453) and a fourth switch (454). As shown in fig. 5, a first end of the reversing switch module (45) is connected with one end of the first switch (451), and the other end of the first switch (451) is connected with a fifth end of the reversing switch module (45); the second end of the reversing switch module (45) is connected with one end of a second switch (452), and the other end of the second switch (452) is connected with the fourth end of the reversing switch module (45); the first end of the reversing switch module (45) is connected with one end of the third switch (453), and the other end of the third switch (453) is connected with the fourth end of the reversing switch module (45); the second end of the reversing switch module (45) is connected with one end of a fourth switch (454), and the other end of the fourth switch (454) is connected with the fifth end of the reversing switch module (45). In the embodiment of the invention, the first switch (451) and the second switch (452) both comprise normally closed controllable switches, and the third switch (453) and the fourth switch (454) both comprise normally open controllable switches.

In an embodiment of the present invention, the controllable power supply module (47) includes a fifth switch (471) for the switch driving. As shown in fig. 6, one end of the fifth switch (471) is connected to the first end of the switch driving controllable power module (47), and the other end of the fifth switch (471) is connected to the second end of the switch driving controllable power module (47). The fifth switch (471) comprises a normally open controllable switch.

In the embodiment of the invention, the self-adjusting circuit (40) for the zero line and the live line further comprises: a rectifier bridge module (51) and a capacitor (52). As shown in fig. 7, the fourth end of the reversing switch module (45) is connected to the first end of the bridge rectifier module (51), and the fifth end of the reversing switch module (45) is connected to the second end of the bridge rectifier module (51); the third end of the rectifier bridge module (51) is connected with the first end of the switching power supply module (46), and the fourth end of the rectifier bridge module (51) is connected with the second end of the switching power supply module (46); and a capacitor (52) is arranged between the third end of the rectifier bridge module (51) and the fourth end of the rectifier bridge module (51).

In the embodiment of the invention, as shown in fig. 8, the three-phase high voltage is transformed into single-phase 220V commercial power through a transformer, wherein the zero line (N) is connected with the ground, and the casing (PE) of the consumer is connected with the ground, so that the zero line (N) and the casing (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 and live 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 optocoupler, where a connection relationship between the diode D, the resistor Rp, the capacitor C, the resistor R, the resistor Rm, and the optocoupler is shown in fig. 9.

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. 9, the diode D performs a half-wave rectification function to provide a positive voltage for a following circuit, and outputs a relatively stable and continuous dc signal to a position between the pins 1 and 2 of the optocoupler through the functions of the voltage dividing resistor R and the 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 (100) is provided, and the air conditioner (100) may include any one of the above-mentioned zero line and live line self-adjusting circuits (40), as shown in fig. 10.

As shown in fig. 11, an implementation flow diagram of a zero-fire line self-adjusting method provided in an embodiment of the present invention is shown, and the method specifically includes the following steps:

and S1101, if the zero-live wire detection module detects that the zero-live wire is normally connected, the MCU reports that the zero-live wire is normally connected to the indoor unit.

In the embodiment of the invention, after the air conditioner is installed and powered on, the switching power supply module (46) starts to work, the MCU (42) and the peripheral control circuit thereof can work normally, and the zero-live wire detection module (41) detects whether a zero-live wire is connected reversely, namely whether the wire sequence of the first power supply lead (48) and the second power supply lead (49) is connected reversely.

If the output signal of the third terminal of the zero-live line detection module (41) is at a high level, it indicates that the first power supply lead (48) and the second power supply lead (49) are normally connected, and the zero-live line does not need to be adjusted, as shown in fig. 5. The normal starting action is directly carried out when the wiring is normal, the MCU (42) communicates with the indoor unit and reports that the zero-live wire wiring is normal to the indoor unit.

Because the first switch (451) and the second switch (452) are in a normally closed state, the third switch (453) and the fourth switch (454) are in a normally open state, and the fifth switch (471) is in a normally open state, at the moment, the first switch (451), the second switch (452), the third switch (453), the fourth switch (454) and the fifth switch (471) do not need any action, namely, the reversing switch module (45) and the driving circuit thereof do not need power supplies.

Under the working condition of normal wiring of the zero line and the live line, the reversing switch module (45) and the drive circuit thereof do not work except for the zero line and live line detection module (41), so that the electric energy loss is reduced to a certain extent, the misoperation of the switch can be prevented, and the system reliability is improved.

And S1102, if the zero-live wire detection module detects that the zero-live wire is abnormal in wiring, the MCU controls the switch to drive the controllable power supply module to supply power to the reversing switch module and the switch driving module, controls the reversing switch module, and connects the zero wire into the communication module.

In the embodiment of the invention, if the output signal of the third end of the zero-live wire detection module (41) is at a low level, the abnormal wiring of the first power supply lead (48) and the second power supply lead (49) is proved, and the zero-live wire needs to be adjusted. As shown in fig. 12, after the air conditioner is powered on, the air conditioner passes through the rectifier bridge module (51) and then passes through the energy storage filter of the electrolyte capacitor (52), the switching power supply module (46) works normally to provide power for the MCU (42) and the peripheral control circuit thereof.

After receiving a low level signal output by the third end of the zero-live wire detection module (41), the MCU (42) determines that the zero-live wire is reversely connected, at this time, the fifth switch (471) is controlled to be closed, the driving switch drives the controllable power supply module (47) to supply power to the reversing switch module (45) and the switch driving module (44), the MCU (42) controls the first switch (451) and the second switch (452) to be opened, after a delay time elapses and the first switch (451) and the second switch (452) are controlled to be completely opened, the MCU (42) controls the third switch (453) and the fourth switch (454) to be closed, and the zero-live wire is connected to the communication module (43), as shown in fig. 13, to prevent the zero-live wire from being short-circuited, and the zero-live wire adjustment process is completed.

Therefore, the communication function of the air conditioner outdoor unit and the indoor unit is recovered, the indoor unit reports that the zero line and the live line are reversely connected, and the indoor unit records the working condition that the zero line and the live line of the outdoor unit are reversely connected. During the idle period when the first switch (451) and the second switch (452) are opened and the third switch (453) and the fourth switch (454) are closed, the capacitor (52) C between the rectifier bridge module (51) and the switch power supply module (46) is large enough to provide electric energy for a period of time for the controller, and the commutation action can be completed.

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 device comprises a zero-live wire detection module, an MCU (microprogrammed control unit), a communication module, a switch driving module, a reversing switch module, a switch power supply module and a switch driving controllable power supply module;

2. The zero line and live line self-adjusting circuit of claim 1, wherein the commutating switch module comprises a first switch, a second switch, a third switch, a fourth switch;

3. The zero and live line self-adjusting circuit of claim 2, wherein the first switch and the second switch each comprise a normally closed controllable switch, and the third switch and the fourth switch each comprise a normally open controllable switch.

4. The zero line and live line self-adjusting circuit according to claim 1, wherein the switch driving controllable power supply module comprises a fifth switch;

5. The zero line and live line self-adjusting circuit of claim 4, wherein the fifth switch comprises a normally open controllable switch.

6. The zero line and live line self-adjusting circuit according to any one of claims 1 to 5, further comprising: a rectifier bridge module and a capacitor;

7. An air conditioner characterized by comprising the zero fire line self-adjusting circuit of any one of claims 1 to 6.

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

9. The method of claim 8, wherein if the hot and neutral detection module detects that the hot and neutral wires are connected normally, the MCU reporting the hot and neutral wires to the indoor unit, comprising:

10. The method of claim 8, wherein if the hot and neutral wire detection module detects an abnormal hot and neutral wire connection, the MCU controls the switch to drive the controllable power module to supply power to the commutation switch module and the switch driving module, and controls the commutation switch module to connect the neutral wire to the communication module, comprising: