CN110470037B - Anti-reverse connection circuit, method and device for power line of variable frequency air conditioner and air conditioner - Google Patents
Anti-reverse connection circuit, method and device for power line of variable frequency air conditioner and air conditioner Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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Abstract
The invention discloses an anti-reverse connection circuit, a method and a device of a power line of a variable frequency air conditioner and the air conditioner. The invention is connected with the indoor unit and the outdoor unit through the zero line by the detection unit, connected with the indoor unit through the first communication line, connected with the outdoor unit through the second communication line, and connected with the switch unit; the switch unit is connected with the indoor unit through a first live wire and connected with the outdoor unit through a second live wire; the detection unit acquires the output voltage of the indoor unit, acquires external interruption time according to the output voltage, and judges whether the first live wire is reversely connected with the first communication line or not according to the external interruption time; the switch unit disconnects the connection between the indoor unit and the outdoor unit when the indoor unit and the outdoor unit are reversely connected. The detection unit obtains the external interruption time and detects whether the power lines are reversely connected according to the external interruption time, the detection loop is simple and accurate, the speed is high, the cost is low, the outdoor unit main control panel cannot be electrified under the condition of wrong line connection, and the possibility of board burning is avoided.
Description
Technical Field
The invention relates to the technical field of variable frequency air conditioners, in particular to an anti-reverse connection circuit, a method and a device for a power line of a variable frequency air conditioner and the air conditioner.
Background
A common N-wire current loop communication circuit is commonly adopted for communication between an indoor unit and an outdoor unit of a variable frequency air conditioner, connecting wires of the indoor unit and the outdoor unit comprise a live wire, a zero wire and a communication wire, and when the live wire, the zero wire and the communication wire are connected in an opposite mode, if a main control panel of the outdoor unit is electrified, the panel burning situation is likely to occur.
Chinese patent document No. cn201420335084.x discloses an indoor and outdoor unit power supply wiring error protection device of a variable frequency air conditioner, and specifically discloses that a live wire, a zero line and a SIG line of an indoor unit side and an outdoor unit side are correspondingly connected and form a communication current loop, the outdoor unit side is isolated by a photoelectric coupler and then connected with a serial communication interface of an outdoor electric control MCU through a triode driving circuit, the outdoor electric control MCU samples a power supply voltage value rectified by a rectifier bridge stack, and when the voltage value received by an outdoor unit control panel is less than a judgment threshold value, the connection error line is judged. This patent can't accomplish the complete isolation of outdoor main control board and power cord, and the main control board still has the board risk of burning when power wiring is wrong, and simultaneously, whether the use voltage signal judges that the wiring is wrong easily with fault coincidence such as low voltage protection and decision time longer, influence fault judgement accuracy nature and real-time, lead to off-premises station main control board security not high.
Disclosure of Invention
The invention mainly aims to provide an anti-reverse connection circuit, a method and a device for a power line of a variable frequency air conditioner and the air conditioner, and aims to solve the technical problem that an outdoor unit main control board is unsafe due to the fact that wiring errors of an indoor unit and an outdoor unit of the variable frequency air conditioner cannot be timely and accurately judged in the prior art.
In order to achieve the aim, the invention provides an anti-reverse connection circuit of a power line of a variable frequency air conditioner, which comprises a detection unit and a switch unit; the detection unit is respectively connected with the indoor unit and the outdoor unit through a zero line, connected with the indoor unit through a first communication line and connected with the outdoor unit through a second communication line, and further connected with the switch unit; the switch unit is connected with the indoor unit through a first live wire and connected with the outdoor unit through a second live wire; wherein,
the detection unit is used for acquiring the output voltage of the indoor unit, acquiring external interruption time according to the output voltage, and judging whether the first live wire is reversely connected with the first communication line or not according to the external interruption time;
and the switch unit is used for disconnecting the indoor unit from the outdoor unit when the indoor unit is reversely connected.
Preferably, the detection unit comprises a first optical coupler, a second optical coupler and a microcontroller; wherein,
the first end of the control end of the first optical coupler is connected with a first external power supply, the second end of the control end of the first optical coupler is connected with the first control end of the microcontroller, the first end of the controlled end of the first optical coupler is respectively connected with the indoor unit and the outdoor unit through a zero line, and the second end of the controlled end of the first optical coupler is connected with the first end of the control end of the second optical coupler;
a second control end of the microcontroller is connected with the switch unit, and a communication end of the microcontroller and an interruption end of the microcontroller are both connected with a first end of a controlled end of the second optocoupler;
the second end of the control end of the second optocoupler is connected with the indoor unit through a first communication line, the first end of the control end of the second optocoupler is connected with the outdoor unit through a second communication line, and the second end of the controlled end of the second optocoupler is connected with a second external power supply.
Preferably, the detection unit further comprises a first capacitor, a second capacitor and a third capacitor; wherein,
the first end of the first capacitor is connected with the second end of the control end of the first optocoupler and the first control end of the microcontroller respectively, and the second end of the first capacitor is grounded;
the first end of the second capacitor is connected with the first end of the controlled end of the second optocoupler and the communication end of the microcontroller respectively, and the second end of the second capacitor is grounded;
the first end of the third capacitor is connected with the first end of the second capacitor and the interrupt end of the microcontroller respectively, and the second end of the third capacitor is grounded.
Preferably, the switch unit includes a relay, a coil of the relay is connected to the second control end of the microcontroller, and contacts at two ends of the relay are connected to the indoor unit through a first live wire and the outdoor unit through a second live wire, respectively.
The invention also provides an anti-reverse connection device of the power line of the variable frequency air conditioner, which comprises the anti-reverse connection circuit of the power line of the variable frequency air conditioner.
The invention also provides an air conditioner which comprises an indoor unit, an outdoor unit and the reverse connection preventing device of the power line of the variable frequency air conditioner.
The invention also provides an anti-reverse connection method of the power line of the variable frequency air conditioner, which comprises the following steps:
acquiring the output voltage of the indoor unit;
obtaining an external interrupt time according to the output voltage;
and judging whether the first live wire is reversely connected with the first communication wire or not according to the external interrupt time.
Preferably, the step of determining whether the first live wire is reversely connected to the first communication line according to the external interrupt time includes:
and when the external interruption time is greater than the preset time, judging that the first live wire is reversely connected with the first communication wire.
Preferably, after the step of determining whether the first live wire is reversely connected to the first communication line according to the external interrupt time, the method further includes:
and when the first live wire is reversely connected with the first communication wire, the relay is controlled to disconnect the indoor unit and the outdoor unit.
Preferably, the step of determining whether the first live wire is reversely connected to the first communication line according to the external interrupt time includes:
and when the external interruption time is not greater than the preset time, judging that the first live wire and the first communication wire are not reversely connected.
The invention is connected with the indoor unit and the outdoor unit through the zero line by the detection unit, connected with the indoor unit through the first communication line, connected with the outdoor unit through the second communication line, and connected with the switch unit; the switch unit is connected with the indoor unit through a first live wire and connected with the outdoor unit through a second live wire; the detection unit acquires the output voltage of the indoor unit, acquires external interruption time according to the output voltage, and judges whether the first live wire is reversely connected with the first communication line or not according to the external interruption time; the switch unit disconnects the connection between the indoor unit and the outdoor unit when the indoor unit and the outdoor unit are reversely connected. The detection loop is simple and accurate, high in speed and low in cost, and the outdoor unit main control board cannot be electrified under the condition of wrong connection, so that the possibility of board burning is avoided.
Drawings
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an embodiment of an anti-reverse connection circuit of a power line of a variable frequency air conditioner according to the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of an anti-reverse connection circuit of a power line of a variable frequency air conditioner according to the present invention;
FIG. 3 is a schematic diagram of the microcontroller receiving signals when L and S are misconnected in one embodiment;
fig. 4 is a schematic flow chart of an embodiment of an anti-reverse connection method for a power line of an inverter air conditioner according to the invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Detection unit | IC1 | First |
| 200 | Switch unit | IC2 | Second optical coupler |
| L1 | First firing line | V1 | A first external power supply |
| L2 | Second firing line | V2 | Second external power supply |
| N | Zero line | MCU | Micro-controller |
| S1 | First communication line | C1 | First capacitor |
| S2 | Second communication line | C2 | Second capacitor |
| RY | Relay with a movable contact | C3 | Third capacitor |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides an anti-reverse connection circuit of a power line of a variable frequency air conditioner.
Referring to fig. 1, in an embodiment, the circuit includes a detection unit 100 and a switch unit 200; the detection unit 100 is connected to the indoor unit and the outdoor unit through a neutral line (N), connected to the indoor unit through a first communication line (S1), and connected to the outdoor unit through a second communication line (S2), and the detection unit 100 is further connected to the switch unit 200; the switching unit 200 is connected to the indoor unit through a first live line (L1) and to the outdoor unit through a second live line (L2); the detection unit 100 is configured to obtain an output voltage of the indoor unit, obtain an external interruption time according to the output voltage, and determine whether the first live wire is reversely connected to the first communication line according to the external interruption time; the switching unit 200 is configured to disconnect the indoor unit from the outdoor unit when the indoor unit is reversely connected.
It should be noted that, a common N-wire current loop communication circuit is commonly used for communication between an indoor unit and an outdoor unit of the inverter air conditioner, that is, a current loop and an N-wire of an ac power supply share a wire, and a signal is carried on the current loop to implement a communication circuit for transmitting a signal at a longer distance. In the existing communication circuit of the indoor unit and the outdoor unit, when L, N is connected reversely, a main control panel of the outdoor unit cannot be subjected to panel burning and effective current loop communication is not formed, and communication faults are reported; when N, S is connected reversely, a diode in the current loop communication circuit is cut off reversely, the circuit board cannot be burnt, effective current loop communication cannot be formed, and communication faults are reported; when L, S is connected reversely, high-voltage signal is directly applied to communication loop to generate large current, resulting in burning plate.
In the embodiment, a scheme of communication is carried out on indoor and outdoor units of the variable frequency air conditioner by using a common zero line current loop, and an anti-reverse connection circuit of a power line of the variable frequency air conditioner is added in the middle. When the L1 and S1 are reversely connected, the external interruption time detected by the detection unit 100 is significantly longer than the external interruption time when the L1 and S1 are not reversely connected, so that the L1 and S1 are determined to be reversely connected, and the switch unit 200 is controlled to be turned off, thereby preventing the outdoor unit from being burned.
In this embodiment, the detection unit receives a signal of the indoor unit and controls the on/off of the switch unit 200, so as to control the connection between the indoor unit and the outdoor unit, when L1 is connected to S1 in the opposite direction, the outdoor unit is not powered on, the main control panel of the outdoor unit is in a safe state, and the panel burning is not caused. Meanwhile, whether the power line is reversely connected or not is judged according to the interruption time of the signal in the embodiment, compared with the traditional judgment method according to the voltage signal, the judgment method is not easy to coincide with the low-voltage protection fault, the judgment is more accurate, the judgment time is shorter, and the efficiency is higher.
Further, referring to fig. 1 and fig. 2, in an embodiment, the detecting unit 100 includes a first optical coupler IC1, a second optical coupler IC2, and a microcontroller MCU; a first end of a control end of the first optical coupler IC1 is connected with a first external power supply V1, a second end of a control end of the first optical coupler IC1 is connected with a first control end CON1 of the microcontroller MCU, a first end of a controlled end of the first optical coupler IC1 is respectively connected with the indoor unit and the outdoor unit through a zero line N, and a second end of a controlled end of the first optical coupler IC1 is connected with a first end of a control end of the second optical coupler IC 2; a second control terminal CON2 of the microcontroller MCU is connected to the switch unit 200, and both a communication terminal RXD of the microcontroller MCU and an interrupt terminal INT of the microcontroller MCU are connected to a first terminal of a controlled terminal of the second optocoupler IC 2; a second end of a control end of the second optical coupler IC2 is connected with the indoor unit through a first communication line S1, a first end of a control end of the second optical coupler IC2 is connected with the outdoor unit through a second communication line S2, and a second end of a controlled end of the second optical coupler IC2 is connected with a second external power supply V2.
It is easy to understand that the first external power source V1 and the second external power source V2 are both external power sources of the circuit, and the voltage thereof may be + 5V. The microcontroller MCU may be a microcontroller of the standby board or an independent controller, which is not limited in this embodiment.
It should be noted that, after the microcontroller MCU is powered on, the first optical coupler IC1 and the second optical coupler IC2 are controlled to be turned on, and at this time, the microcontroller MCU and the indoor unit form a current loop, and the switch unit 200 is turned off, so that the outdoor unit is powered off. Meanwhile, the microcontroller MCU receives a signal sent by the indoor unit through one external interrupt port, when L is connected with S in a reverse manner, the level signal received by external interrupt is as shown in fig. 3, since a diode in the communication circuit can only receive a half-wave signal, the effective value is 220/2 ═ 110V, when the voltage is greater than the conduction value of the second optocoupler IC2, the external interrupt port receives a high level, the period is 0.02S of the voltage signal period, A, A 'triggers the interrupt time for a rising edge, and B, B' triggers the interrupt time for a falling edge, and by monitoring the continuous interrupt trigger time interval, whether the line is connected in a wrong way is determined, and fault trigger is responded quickly, which is simple and efficient.
It can be understood that when L1 and S1 are not inverted, i.e. under normal conditions, the output voltage of the indoor unit is 24V, and when L1 and S1 are inverted, the output voltage of the indoor unit is 220V of alternating current, therefore, when L1 and S1 are inverted, the period time of the voltage signal is longer than that under normal conditions, and the external interrupt time received by the microcontroller MCU is significantly longer. At this time, by detecting whether the external interruption time is greater than the preset time, when the external interruption time is detected to be greater than the preset time, it may be determined that L1 and S1 are reversed.
Further, the detecting unit 100 further includes a first capacitor C1, a second capacitor C2, and a third capacitor C3; a first end of the first capacitor C1 is connected to a second end of the control end of the first optocoupler IC1 and a first control end CON1 of the microcontroller MCU, respectively, and a second end of the first capacitor C1 is grounded; a first end of the second capacitor C2 is connected with a first end of a controlled end of the second optocoupler IC2 and a communication end RXD of the microcontroller MCU respectively, and a second end of the second capacitor C2 is grounded; a first end of the third capacitor C3 is connected to the first end of the second capacitor C2 and the interrupt end INT of the microcontroller MCU, respectively, and a second end of the third capacitor C3 is grounded.
It should be noted that, in order to ensure that the microcontroller MCU receives a more accurate useful signal, a capacitor needs to be added in front of a pin through which the microcontroller MCU receives a signal to filter to ground, where the first capacitor C1, the second capacitor C2, and the third capacitor C3 are all filter capacitors, so as to avoid noise in the signal input to the microcontroller MCU.
Further, the switch unit 200 includes a relay RY, a coil of the relay RY is connected to a second control terminal CON2 of the microcontroller MCU, contacts at two ends of the relay RY are respectively connected to the indoor unit through a first live wire L1 and the outdoor unit through a second live wire L2.
It should be understood that when the detection unit determines that L1 and S1 are reversed, the microcontroller MCU controls the relay RY to be turned off, so that the indoor unit does not supply power to the outdoor unit, and when L1 and S1 are not reversed, the relay RY is controlled to be turned on, so that the outdoor unit supplies power, and the whole unit works normally.
In the embodiment, the detection unit is respectively connected with the indoor unit and the outdoor unit through a zero line, is connected with the indoor unit through a first communication line, is connected with the outdoor unit through a second communication line, and is also connected with the switch unit; the switch unit is connected with the indoor unit through a first live wire and connected with the outdoor unit through a second live wire; the detection unit acquires the output voltage of the indoor unit, acquires external interruption time according to the output voltage, and judges whether the first live wire is reversely connected with the first communication line or not according to the external interruption time; the switch unit disconnects the connection between the indoor unit and the outdoor unit when the indoor unit and the outdoor unit are reversely connected. The detection loop is simple and accurate, high in speed and low in cost, and the outdoor unit main control board cannot be electrified under the condition of wrong connection, so that the possibility of board burning is avoided.
The invention also provides an anti-reverse connection device of the power line of the variable frequency air conditioner, which comprises the anti-reverse connection circuit of the power line of the variable frequency air conditioner, and the circuit structure of the anti-reverse connection circuit of the power line of the variable frequency air conditioner of the anti-reverse connection device of the power line of the variable frequency air conditioner can refer to the embodiment and is not repeated herein; it can be understood that, since the anti-reverse connection device of the inverter air-conditioner power line of the embodiment adopts the technical solution of the anti-reverse connection circuit of the inverter air-conditioner power line, the anti-reverse connection device of the inverter air-conditioner power line has all the above beneficial effects, it should be understood that the anti-reverse connection device of the inverter air-conditioner power line may be a standby small board, L, N, S incoming line terminals and outgoing line terminals are configured on the standby small board, the incoming line terminals are connected with the indoor unit through L1, S1 and N, respectively, and the outgoing line terminals are connected with the outdoor unit through L2, S2 and N, respectively.
The invention also provides an air conditioner which comprises an indoor unit, an outdoor unit and the reverse connection preventing device of the power line of the variable frequency air conditioner. It can be understood that, since the air conditioner of this embodiment adopts the technical solution of the above-mentioned reverse connection prevention device for the power line of the inverter air conditioner, the air conditioner has all the above-mentioned beneficial effects.
Based on the hardware structure, the invention also provides an anti-reverse connection method of the power line of the variable frequency air conditioner. As shown in fig. 4, in the present embodiment, the method includes the steps of:
s10: acquiring the output voltage of the indoor unit;
it can be understood that when L1 and S1 are not reversed, i.e. under normal conditions, the output voltage of the indoor unit is 24V, and when L1 and S1 are reversed, the output voltage of the indoor unit is 220V of ac.
S20: obtaining an external interrupt time according to the output voltage;
it should be noted that the second optical coupler IC2 generates different external interrupt signals according to the received output voltage and sends the external interrupt signals to the microcontroller MCU, and the microcontroller MCU determines the external interrupt time according to the external interrupt signals.
S30: and judging whether the first live wire is reversely connected with the first communication wire or not according to the external interrupt time.
It should be understood that when L1 is connected opposite to S1, the voltage signal cycle time is longer than that of the normal case, and the external interrupt time received by the microcontroller MCU is significantly longer. At this time, by detecting whether the external interruption time is greater than the preset time, when the external interruption time is detected to be greater than the preset time, it may be determined that L1 and S1 are reversed.
The preset time may be set by self-definition according to experience, such as 16ms, 18ms, and the like, which is not limited in this embodiment.
In a specific implementation, when the external interruption time is not greater than the preset time, it is determined that L1 and S1 are not reversely connected, when the external interruption time is greater than the preset time, it is determined that L1 and S1 are reversely connected, and when L1 and S1 are reversely connected, the relay RY is controlled to disconnect the indoor unit from the outdoor unit.
In the following, the working principle of the embodiment is described by taking an anti-reversion device of a power line of the inverter air conditioner as a standby platelet as an example: after the standby small plate is electrified and enters a standby state, the first optical coupler IC1 and the second optical coupler IC2 are opened, the standby small plate and the indoor unit form a current loop, and the relay RY is turned off to enable the outdoor unit to be powered off. The second optocoupler IC2 generates different external interrupt signals according to the received output voltage and sends the external interrupt signals to the microcontroller MCU, the microcontroller MCU determines the external interrupt time according to the external interrupt signals, when the interval of the continuous external interrupt time is less than 16ms, it is judged that no power line reverse connection occurs, the relay RY is closed, the outdoor unit supplies power, and the whole machine works normally; and when the continuous external interruption time interval is more than 16ms, the first optical coupler IC1 and the second optical coupler IC2 are closed, the relay RY is switched off, and the power line is in reverse connection failure.
In the embodiment, the output voltage of the indoor unit is obtained, the external interruption time is obtained according to the output voltage, and whether the first live wire is reversely connected with the first communication line is judged according to the external interruption time. The detection loop is simple and accurate, high in speed and low in cost, and the outdoor unit main control board cannot be electrified under the condition of wrong connection, so that the possibility of board burning is avoided.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An anti-reverse connection circuit of a power line of a variable frequency air conditioner is characterized by comprising a detection unit and a switch unit; the detection unit is respectively connected with an indoor unit and an outdoor unit through a zero line, is connected with the indoor unit through a first communication line, is connected with the outdoor unit through a second communication line, and is also connected with the switch unit; the switch unit is connected with the indoor unit through a first live wire and connected with the outdoor unit through a second live wire; wherein,
the detection unit is used for acquiring the output voltage of the indoor unit, acquiring external interruption time according to the output voltage, and judging whether the first live wire is reversely connected with the first communication line or not according to the external interruption time;
and the switch unit is used for disconnecting the indoor unit from the outdoor unit when the indoor unit is reversely connected.
2. The reverse connection prevention circuit of the power line of the variable frequency air conditioner as claimed in claim 1, wherein the detection unit comprises a first optical coupler, a second optical coupler and a microcontroller; wherein,
the first end of the control end of the first optical coupler is connected with a first external power supply, the second end of the control end of the first optical coupler is connected with the first control end of the microcontroller, the first end of the controlled end of the first optical coupler is respectively connected with the indoor unit and the outdoor unit through a zero line, and the second end of the controlled end of the first optical coupler is connected with the first end of the control end of the second optical coupler;
a second control end of the microcontroller is connected with the switch unit, and a communication end of the microcontroller and an interruption end of the microcontroller are both connected with a first end of a controlled end of the second optocoupler;
the second end of the control end of the second optocoupler is connected with the indoor unit through a first communication line, the first end of the control end of the second optocoupler is connected with the outdoor unit through a second communication line, and the second end of the controlled end of the second optocoupler is connected with a second external power supply.
3. The anti-reverse connection circuit of the power line of the inverter air conditioner as claimed in claim 2, wherein the detection unit further comprises a first capacitor, a second capacitor and a third capacitor; wherein,
the first end of the first capacitor is connected with the second end of the control end of the first optocoupler and the first control end of the microcontroller respectively, and the second end of the first capacitor is grounded;
the first end of the second capacitor is connected with the first end of the controlled end of the second optocoupler and the communication end of the microcontroller respectively, and the second end of the second capacitor is grounded;
the first end of the third capacitor is connected with the first end of the second capacitor and the interrupt end of the microcontroller respectively, and the second end of the third capacitor is grounded.
4. The reverse connection prevention circuit for the power line of the inverter air conditioner as claimed in claim 3, wherein the switch unit comprises a relay, a coil of the relay is connected with the second control end of the microcontroller, and contacts at two ends of the relay are respectively connected with the indoor unit through a first live wire and the outdoor unit through a second live wire.
5. An anti-reverse connection device of a power line of a variable frequency air conditioner, which is characterized by comprising an anti-reverse connection circuit of the power line of the variable frequency air conditioner according to any one of claims 1 to 4.
6. An air conditioner, characterized in that, the air conditioner comprises an indoor unit, an outdoor unit and the reverse connection preventing device of the variable frequency air conditioner power line of claim 5.
7. An anti-reverse connection method of a variable frequency air conditioner power line, which is applied to an anti-reverse connection circuit of the variable frequency air conditioner power line according to any one of claims 1 to 4, an anti-reverse connection device of the variable frequency air conditioner power line according to claim 5 or an air conditioner according to claim 6, the method comprising the steps of:
acquiring the output voltage of the indoor unit;
obtaining an external interrupt time according to the output voltage;
and judging whether the first live wire is reversely connected with the first communication wire or not according to the external interrupt time.
8. The method for preventing reverse connection of power lines of an inverter air conditioner as claimed in claim 7, wherein the step of determining whether the first live line is reversely connected to the first communication line according to the external interruption time comprises:
and when the external interruption time is greater than the preset time, judging that the first live wire is reversely connected with the first communication wire.
9. The method for preventing reverse connection of a power cord of an inverter air conditioner according to claim 7, wherein after the step of determining whether the first live wire is reversely connected to the first communication line according to the external interruption time, the method further comprises:
and when the first live wire is reversely connected with the first communication wire, the relay is controlled to disconnect the indoor unit and the outdoor unit.
10. The method for preventing reverse connection of power lines of an inverter air conditioner as claimed in claim 7, wherein the step of determining whether the first live line is reversely connected to the first communication line according to the external interruption time comprises:
and when the external interruption time is not greater than the preset time, judging that the first live wire and the first communication wire are not reversely connected.
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| CN111256286B (en) * | 2020-02-17 | 2021-08-17 | 海信（山东）空调有限公司 | Method and device for controlling line sequence |
| CN112798983B (en) * | 2020-12-30 | 2022-03-01 | 珠海格力电器股份有限公司 | Method and device for detecting connecting line of internal and external machines |
| CN114459137A (en) * | 2022-01-11 | 2022-05-10 | 珠海格力电器股份有限公司 | Zero-line and fire-line conditioning device of air conditioner, control method of zero-line and fire-line conditioning device and air conditioner |
| CN114566956B (en) * | 2022-03-08 | 2023-03-10 | 珠海格力电器股份有限公司 | Zero-live wire adjusting circuit and method and air conditioner |
| CN114659230B (en) * | 2022-04-18 | 2023-04-14 | 珠海格力电器股份有限公司 | Zero-live line communication control device of air conditioner, control method of zero-live line communication control device and air conditioner |
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