Phase line zero line reverse connection detection method, device, storage medium and variable frequency air conditioner

Abstract

This invention proposes a method, device, storage medium, and variable frequency air conditioner for detecting reverse connection of phase and neutral wires. The detection method is used in the three-phase rectifier circuit of the variable frequency air conditioner. The three-phase rectifier circuit includes a neutral wire, a DC bus, three phase wires, and a first relay, a second relay, and a third relay located on each phase wire. The detection method includes: acquiring a first voltage value of the DC bus when all three relays are closed; acquiring the current voltage value of the DC bus when any relay is open; and determining that one phase wire is reverse connected to the neutral wire when the first voltage value is not equal to the current voltage value. In this invention, there is no need to set up a separate three-phase detection circuit in the power supply circuit of the variable frequency air conditioner. The connection status of the phase and neutral wires can be determined using only the existing three-phase rectifier circuit of the variable frequency air conditioner, facilitating the miniaturization and weight reduction of the power supply circuit of the variable frequency air conditioner.

Description

Technical Field

[0001] This invention relates to the field of power supply adaptability technology, and more specifically, to a method, apparatus, storage medium, and variable frequency air conditioner for detecting reverse connection of phase and neutral wires. Background Technology

[0002] In related technologies, to avoid reversing the phase and neutral wires of inverter air conditioners, the following method is typically used: Figure 1 The three-phase detection circuit shown is used for detection. Its principle is to judge the phase angle generated by the optocoupler when the voltage of the three phase lines changes periodically to the neutral line. Although the cost of this circuit is not high, it occupies a large area and requires three special function pins of the main control chip, which is not conducive to the miniaturization and weight reduction of the main control chip. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the related art.

[0004] Therefore, the first aspect of the present invention is to provide a method for detecting reverse connection of the phase line and the neutral line.

[0005] A second aspect of the present invention is to provide a detection device for reverse connection of phase and neutral wires.

[0006] A third aspect of the present invention is to provide a detection device for reverse connection of phase and neutral wires.

[0007] A fourth aspect of the present invention is to provide a readable storage medium.

[0008] The fifth aspect of the present invention is to provide an inverter air conditioner.

[0009] In view of this, according to one aspect of the present invention, a method for detecting reverse connection of phase and neutral wires is proposed for a three-phase rectifier circuit of a variable frequency air conditioner. The three-phase rectifier circuit includes a neutral wire, a DC bus, three phase wires, and a first relay, a second relay, and a third relay located on each phase wire. The detection method includes: acquiring a first voltage value of the DC bus when all three relays are closed; acquiring the current voltage value of the DC bus when any relay is open; and determining that a phase wire is reverse connected to the neutral wire when the first voltage value is not equal to the current voltage value.

[0010] It should be noted that the phase-neutral reverse connection detection method proposed in this invention is mainly used for the three-phase rectifier circuit of variable frequency air conditioners. Its execution subject can be a phase-neutral reverse connection detection device. In order to more clearly explain the phase-neutral reverse connection detection method proposed in this invention, the following technical solution uses the phase-neutral reverse connection detection device as the execution subject of the phase-neutral reverse connection detection method for exemplary description.

[0011] In this technical solution, the three-phase rectifier circuit is the basic power supply circuit for the variable frequency air conditioner. The phase lines are used to indicate the AC bus of the basic power supply circuit. The first relay, the second relay, and the third relay are respectively installed on the three phase lines to control the disconnection and connection of the three phase lines with the three-phase rectifier circuit.

[0012] Specifically, the detection device first controls the first, second, and third relays to close, and then acquires the current voltage value of the DC bus, i.e., the first voltage value. Specifically, when all three relays are closed, regardless of whether there is a reverse connection between the phase line and neutral line in the three-phase rectifier circuit, the acquired first voltage value is equal to the phase voltage of the phase line. A multiple or equal to the phase line voltage times.

[0013] Furthermore, when the detection device disconnects any of the aforementioned relays, it acquires the current voltage value of the DC bus, that is, it acquires the DC bus voltage value when only the first relay is disconnected, or only the second relay is disconnected, or only the third relay is disconnected.

[0014] Specifically, if any phase line and neutral line in the above three-phase rectifier circuit are reversed, disconnecting any of the above relays will cause the voltage value of the DC bus to change from the original value. Phase doubler voltage drops to The phase voltage is doubled. Therefore, the detection device needs to control any relay to disconnect and obtain the current voltage value of the DC bus so that subsequent steps can determine whether any phase line and neutral line in the three-phase rectifier circuit are reversed based on the current voltage value.

[0015] It should be noted that a voltage sensor is installed on the aforementioned DC bus, and the detection device can obtain the aforementioned first voltage value and the aforementioned current voltage value through the voltage sensor.

[0016] Furthermore, the detection device determines the connection status of any one of the three phase lines and the neutral line based on the aforementioned first voltage value and the aforementioned current voltage value, that is, it determines whether there is a situation where one of the three phase lines is reversed with the neutral line. Specifically, if the aforementioned first voltage value and the aforementioned current voltage value are not equal, it is determined that there is a situation where one phase line is reversed with the neutral line.

[0017] Specifically, the detection device can determine whether the current voltage value of the DC bus drops to a certain level when the relay on any phase line is disconnected. The phase voltage is doubled to determine whether any phase line and neutral line are reversed. Therefore, the detection device can determine whether one of the three phase lines and the neutral line are reversed based on the first voltage value and the current voltage value.

[0018] In this technical solution, the detection device first acquires the first voltage value when the first, second, and third relays are all closed; then, it acquires the current voltage value when any of the relays are open; and finally, it determines whether one of the three phase lines is reverse-connected with the neutral line based on the first voltage value and the current voltage value. In this invention, there is no need to add a separate three-phase detection circuit to the power supply circuit of the inverter air conditioner. The connection status of any phase line and neutral line can be determined using only the existing three-phase rectifier circuit of the inverter air conditioner. This facilitates the miniaturization and weight reduction of the inverter air conditioner's power supply circuit, while also reducing the production cost of the inverter air conditioner's power supply circuit.

[0019] Furthermore, the detection method for reverse connection of phase and neutral wires proposed according to the above-described technical solution of the present invention may also have the following additional technical features:

[0020] In the above technical solution, after determining that a phase line and a neutral line are reversed, the detection method further includes: obtaining a second voltage value of the DC bus when only the first relay is open, obtaining a third voltage value of the DC bus when only the second relay is open, and obtaining a fourth voltage value of the DC bus when only the third relay is open; and confirming the connection status of any phase line and neutral line based on the first voltage value, the second voltage value, the third voltage value, and the fourth voltage value.

[0021] In this technical solution, after the detection device determines that a phase line and a neutral line are reversed, it can also determine which specific phase line and neutral line are reversed. The specific method is as follows: the detection device only controls the first relay to open and obtains the voltage value of the DC bus at this time, i.e., the second voltage value; the detection device only controls the second relay to open and obtains the voltage value of the DC bus at this time, i.e., the third voltage value; the detection device only controls the third relay to open and obtains the voltage value of the DC bus at this time, i.e., the fourth voltage value.

[0022] Furthermore, the detection device determines the connection status of any one of the three phase lines and the neutral line based on the first voltage value, the second voltage value, the third voltage value, and the fourth voltage value, that is, it determines which specific phase line and the neutral line are reversed.

[0023] Specifically, if one phase line and the neutral line in the three-phase rectifier circuit are reversed, disconnecting the first relay, the second relay, or the third relay will change the voltage value of the DC bus from the previous value. Phase doubler voltage drops to The phase voltage is doubled. Therefore, the detection device can determine which of the three phase lines is reverse-connected to the neutral line by obtaining the second, third, and fourth voltage values ​​respectively when only the first, second, or third relays are disconnected.

[0024] In this technical solution, the detection device can determine the connection status of any one phase line and the neutral line by obtaining a second voltage value, a third voltage value, and a fourth voltage value when only the first relay, the second relay, or the third relay is disconnected, even when one phase line and the neutral line are reversed in the three-phase rectifier circuit. This eliminates the need for a separate three-phase detection circuit in the power supply circuit of the inverter air conditioner; the connection status of any phase line and the neutral line can be determined using only the existing three-phase rectifier circuit of the inverter air conditioner, facilitating the miniaturization and weight reduction of the power supply circuit of the inverter air conditioner.

[0025] In the above technical solution, the step of confirming the wiring status of any phase line and neutral line based on the first voltage value, the second voltage value, the third voltage value and the fourth voltage value specifically includes: when the third voltage value and the fourth voltage value are both less than the first voltage value, confirming that the phase line where the first relay is located is reversed with the neutral line.

[0026] In this technical solution, the process by which the detection device determines the connection status of any one of the three phase lines in the three-phase rectifier circuit of the variable frequency air conditioner with the neutral line is as follows: the detection device determines the voltage value that is less than the first voltage value among the second voltage value, the third voltage value, and the fourth voltage value.

[0027] Specifically, if the detection device determines that both the third voltage value and the fourth voltage value are less than the first voltage value, the detection device determines that the phase line and the neutral line where the first relay is located are reversed.

[0028] Specifically, if the third and fourth voltage values ​​are less than the first voltage value, it indicates that the DC bus voltage value is lower only when the second relay is disconnected, or the DC bus voltage value is lower only when the third relay is disconnected than the normal value. Phase doubler voltage drops to The phase voltage is doubled, meaning that the phase lines of the second and third relays are not reverse-connected to the neutral line. Therefore, it can be determined that the phase line of the first relay is reverse-connected to the neutral line.

[0029] In this technical solution, after determining that one phase line and the neutral line are reversed in the three-phase rectifier circuit of the inverter air conditioner, the detection device can determine which of the three phase lines is reversed with the neutral line based on the specific relationship between the second voltage value, the third voltage value, the fourth voltage value and the first voltage value, so as to facilitate the rapid handling of the reverse connection fault in subsequent steps.

[0030] In the above technical solution, the step of confirming the wiring status of any phase line and neutral line based on the first voltage value, the second voltage value, the third voltage value and the fourth voltage value specifically includes: when the second voltage value and the fourth voltage value are both less than the first voltage value, confirming that the phase line where the second relay is located is reversed with the neutral line.

[0031] In this technical solution, the process by which the detection device determines the connection status of any one of the three phase lines in the three-phase rectifier circuit of the variable frequency air conditioner with the neutral line is as follows: the detection device determines the voltage value that is less than the first voltage value among the second voltage value, the third voltage value, and the fourth voltage value.

[0032] Specifically, if the detection device determines that both the second voltage value and the fourth voltage value are less than the first voltage value, the detection device determines that the phase line and the neutral line where the second relay is located are reversed.

[0033] Specifically, if both the second and fourth voltage values ​​are less than the first voltage value, it indicates that the DC bus voltage value is only lower when the first relay is disconnected, or only lower when the third relay is disconnected, compared to the normal voltage value. Phase doubler voltage drops to The phase voltage is doubled, meaning that the phase lines of the first and third relays are not reverse-connected to the neutral line. Therefore, it can be determined that the phase line of the second relay is reverse-connected to the neutral line.

[0034] In this technical solution, after determining that one phase line and the neutral line are reversed in the three-phase rectifier circuit of the inverter air conditioner, the detection device can determine which of the three phase lines is reversed with the neutral line based on the specific relationship between the second voltage value, the third voltage value, the fourth voltage value and the first voltage value, so as to facilitate the rapid handling of the reverse connection fault in subsequent steps.

[0035] In the above technical solution, the step of confirming the wiring status of any phase line and neutral line based on the first voltage value, the second voltage value, the third voltage value and the fourth voltage value specifically includes: when the second voltage value and the third voltage value are less than the first voltage value, confirming that the phase line where the third relay is located is reversed with the neutral line.

[0036] In this technical solution, the process by which the detection device determines the connection status of any one of the three phase lines in the three-phase rectifier circuit of the variable frequency air conditioner with the neutral line is as follows: the detection device determines the voltage value that is less than the first voltage value among the second voltage value, the third voltage value, and the fourth voltage value.

[0037] Specifically, if the detection device determines that both the second voltage value and the third voltage value are less than the first voltage value, the detection device determines that the phase line and the neutral line where the third relay is located are reversed.

[0038] Specifically, if both the second and third voltage values ​​are less than the first voltage value, it indicates that the DC bus voltage value is lower only when the first relay is disconnected, or the DC bus voltage value is lower only when the second relay is disconnected than the normal value. Phase doubler voltage drops to The phase voltage is doubled, meaning that the phase lines where the first and second relays are located are not reverse-connected to the neutral line. Therefore, it can be determined that the phase line where the third relay is located is reverse-connected to the neutral line.

[0039] In this technical solution, after determining that one phase line and the neutral line are reversed in the three-phase rectifier circuit of the inverter air conditioner, the detection device can determine which of the three phase lines is reversed with the neutral line based on the specific relationship between the second voltage value, the third voltage value, the fourth voltage value and the first voltage value, so as to facilitate the rapid handling of the reverse connection fault in subsequent steps.

[0040] According to a second aspect of the present invention, a detection device for reverse connection of phase and neutral wires is provided for a three-phase rectifier circuit of a variable frequency air conditioner. The three-phase rectifier circuit includes a neutral wire, a DC bus, three phase wires, and a first relay, a second relay, and a third relay located on each phase wire. The detection device includes: an acquisition module for acquiring a first voltage value of the DC bus when all three relays are closed; the acquisition module is also used to acquire the current voltage value of the DC bus when any relay is open; and a processing module for determining that a phase wire is reverse connected to the neutral wire when the first voltage value is not equal to the current voltage value.

[0041] In this technical solution, the three-phase rectifier circuit is the basic power supply circuit for the variable frequency air conditioner. The phase lines are used to indicate the AC bus of the basic power supply circuit. The first relay, the second relay, and the third relay are respectively installed on the three phase lines to control the disconnection and connection of the three phase lines with the three-phase rectifier circuit.

[0042] Specifically, the acquisition module first acquires the current DC bus voltage value, i.e., the first voltage value, when all three relays (first, second, and third) are closed. Specifically, when all three relays are closed, regardless of whether there is a reverse connection between the phase and neutral lines in the three-phase rectifier circuit, the acquired first voltage value is equal to the phase voltage of the phase line. A multiple or equal to the phase line voltage times.

[0043] Furthermore, when any of the aforementioned relays is disconnected, the acquisition module acquires the current voltage value of the DC bus, that is, acquires the DC bus voltage value when only the first relay is disconnected, or only the second relay is disconnected, or only the third relay is disconnected.

[0044] Specifically, if any phase line and neutral line in the above three-phase rectifier circuit are reversed, disconnecting any of the above relays will cause the voltage value of the DC bus to change from the original value. Phase doubler voltage drops to The phase voltage is doubled. Therefore, the acquisition module needs to obtain the current voltage value of the DC bus when any relay is open, so that the subsequent processing module can determine whether any phase line and neutral line are reversed in the three-phase rectifier circuit based on the current voltage value.

[0045] It should be noted that a voltage sensor is installed on the aforementioned DC bus, and the acquisition module can obtain the aforementioned first voltage value and the aforementioned current voltage value through this voltage sensor.

[0046] Furthermore, the processing module determines the connection status of any one of the three phase lines and the neutral line based on the first voltage value and the current voltage value, that is, it determines whether there is a situation where one of the three phase lines is reversed with the neutral line. Specifically, if the first voltage value and the current voltage value are not equal, it is determined that there is a situation where one phase line is reversed with the neutral line.

[0047] Specifically, the processing module can determine whether the current voltage value of the DC bus drops to a certain level when the relay on any phase line is disconnected. The phase voltage is doubled to determine whether any phase line and neutral line are reversed. Therefore, the detection device can determine whether one of the three phase lines and the neutral line are reversed based on the first voltage value and the current voltage value.

[0048] In this technical solution, the acquisition module first acquires the first voltage value when the first, second, and third relays are all closed; then, when any of the relays are open, it acquires the current voltage value. The processing module determines, based on the first and current voltage values, whether one of the three phase lines is reverse-connected with the neutral line. In this invention, there is no need to add a separate three-phase detection circuit to the power supply circuit of the inverter air conditioner. The connection status of any phase line and neutral line can be determined using only the existing three-phase rectifier circuit of the inverter air conditioner. This facilitates the miniaturization and weight reduction of the inverter air conditioner's power supply circuit, while also reducing the production cost of the inverter air conditioner's power supply circuit.

[0049] Furthermore, the detection device for reverse connection of phase and neutral wires according to the above-described technical solution of the present invention may also have the following additional technical features:

[0050] In the above technical solution, the acquisition module is further configured to acquire the second voltage value of the DC bus when only the first relay is disconnected, acquire the third voltage value of the DC bus when only the second relay is disconnected, and acquire the fourth voltage value of the DC bus when only the third relay is disconnected; the processing module is further configured to confirm the wiring status of any phase line and neutral line based on the first voltage value, the second voltage value, the third voltage value and the fourth voltage value.

[0051] In this technical solution, after the processing device determines that a phase line and a neutral line are reversed, it can also determine which specific phase line and neutral line are reversed. The specific method is as follows: first, the acquisition module acquires the second voltage value of the DC bus when only the first relay is open; when only the second relay is open, it acquires the third voltage value of the DC bus; and when only the third relay is open, it acquires the fourth voltage value of the DC bus.

[0052] Furthermore, the processing module determines the connection status of any one of the three phase lines and the neutral line based on the first voltage value, the second voltage value, the third voltage value, and the fourth voltage value, that is, it determines which of the three phase lines and the neutral line is reversed.

[0053] Specifically, if one phase line and the neutral line in the three-phase rectifier circuit are reversed, disconnecting the first relay, the second relay, or the third relay will change the voltage value of the DC bus from the previous value. Phase doubler voltage drops to The phase voltage is doubled. Therefore, the processing module can determine which of the three phase lines is reverse-connected to the neutral line by obtaining the second, third, and fourth voltage values ​​respectively when the acquisition module disconnects only the first, second, or third relay.

[0054] In this technical solution, the processing module can determine the connection status of any one phase line and the neutral line by obtaining the second, third, and fourth voltage values ​​respectively when only the first, second, or third relays are disconnected, even if one phase line and the neutral line are reversed in the three-phase rectifier circuit. This eliminates the need for a separate three-phase detection circuit in the inverter air conditioner's power supply circuit; the connection status of any phase line and the neutral line can be determined using only the existing three-phase rectifier circuit of the inverter air conditioner, facilitating the miniaturization and weight reduction of the inverter air conditioner's power supply circuit.

[0055] In the above technical solution, the processing module is also used to confirm that the phase line and the neutral line where the first relay is located are reversed when both the third voltage value and the fourth voltage value are less than the first voltage value.

[0056] In this technical solution, the process by which the processing module determines the connection status of any one of the three phase lines in the three-phase rectifier circuit of the variable frequency air conditioner with the neutral line is as follows: the processing module determines the voltage value that is less than the first voltage value among the second voltage value, the third voltage value, and the fourth voltage value.

[0057] Specifically, if the processing module determines that both the third voltage value and the fourth voltage value are less than the first voltage value, the processing module determines that the phase line and the neutral line where the first relay is located are reversed.

[0058] Specifically, if the third and fourth voltage values ​​are less than the first voltage value, it indicates that the DC bus voltage value is lower only when the second relay is disconnected, or the DC bus voltage value is lower only when the third relay is disconnected than the normal value. Phase doubler voltage drops to The phase voltage is doubled, meaning that the phase lines of the second and third relays are not reverse-connected to the neutral line. Therefore, it can be determined that the phase line of the first relay is reverse-connected to the neutral line.

[0059] In this technical solution, after determining that one phase line and the neutral line are reversed in the three-phase rectifier circuit of the variable frequency air conditioner, the processing module can determine which of the three phase lines is reversed with the neutral line based on the specific relationship between the second voltage value, the third voltage value, the fourth voltage value and the first voltage value, so as to facilitate the rapid handling of the reverse connection fault in subsequent steps.

[0060] In the above technical solution, the processing module is also used to confirm that the phase line and the neutral line where the second relay is located are reversed when both the second voltage value and the fourth voltage value are less than the first voltage value.

[0061] In this technical solution, the process by which the processing module determines the connection status of any one of the three phase lines in the three-phase rectifier circuit of the variable frequency air conditioner with the neutral line is as follows: the processing module determines the voltage value that is less than the first voltage value among the second voltage value, the third voltage value, and the fourth voltage value.

[0062] Specifically, if the processing module determines that both the second voltage value and the fourth voltage value are less than the first voltage value, the processing module determines that the phase line and the neutral line where the second relay is located are reversed.

[0063] Specifically, if both the second and fourth voltage values ​​are less than the first voltage value, it indicates that the DC bus voltage value is only lower when the first relay is disconnected, or only lower when the third relay is disconnected, compared to the normal voltage value. Phase doubler voltage drops to The phase voltage is doubled, meaning that the phase lines of the first and third relays are not reverse-connected to the neutral line. Therefore, it can be determined that the phase line of the second relay is reverse-connected to the neutral line.

[0064] In this technical solution, after determining that one phase line and the neutral line are reversed in the three-phase rectifier circuit of the variable frequency air conditioner, the processing module can determine which of the three phase lines is reversed with the neutral line based on the specific relationship between the second voltage value, the third voltage value, the fourth voltage value and the first voltage value, so as to facilitate the rapid handling of the reverse connection fault in subsequent steps.

[0065] In the above technical solution, the processing module is also used to confirm that the phase line of the third relay is reversed with the neutral line when the second voltage value and the third voltage value are less than the first voltage value.

[0066] In this technical solution, the process by which the processing module determines the connection status of any one of the three phase lines in the three-phase rectifier circuit of the variable frequency air conditioner with the neutral line is as follows: the processing module determines the voltage value that is less than the first voltage value among the second voltage value, the third voltage value, and the fourth voltage value.

[0067] Specifically, if the processing module determines that both the second voltage value and the third voltage value are less than the first voltage value, the processing module determines that the phase line and the neutral line where the third relay is located are reversed.

[0068] Specifically, if both the second and third voltage values ​​are less than the first voltage value, it indicates that the DC bus voltage value is lower only when the first relay is disconnected, or the DC bus voltage value is lower only when the second relay is disconnected than the normal value. Phase doubler voltage drops to The phase voltage is doubled, meaning that the phase lines where the first and second relays are located are not reverse-connected to the neutral line. Therefore, it can be determined that the phase line where the third relay is located is reverse-connected to the neutral line.

[0069] In this technical solution, after determining that one phase line and the neutral line are reversed in the three-phase rectifier circuit of the variable frequency air conditioner, the processing module can determine which of the three phase lines is reversed with the neutral line based on the specific relationship between the second voltage value, the third voltage value, the fourth voltage value and the first voltage value, so as to facilitate the rapid handling of the reverse connection fault in subsequent steps.

[0070] According to a third aspect of the present invention, a detection device for reverse connection of phase and neutral wires is provided. The detection device includes: a memory storing a program or instructions; and a processor executing the program or instructions stored in the memory to implement the steps of the detection method for reverse connection of phase and neutral wires as proposed in the above-described technical solution of the present invention. Therefore, it has all the beneficial technical effects of the detection method for reverse connection of phase and neutral wires proposed in the above-described technical solution of the present invention, which will not be elaborated further here.

[0071] According to a fourth aspect of the present invention, a readable storage medium is provided on which a program or instructions are stored, which, when executed by a processor, implement the detection method for reverse connection of phase and neutral wires as proposed in the above-described technical solution of the present invention. Therefore, this readable storage medium possesses all the beneficial effects of the detection method for reverse connection of phase and neutral wires proposed in the above-described technical solution of the present invention, which will not be elaborated further here.

[0072] According to a fifth aspect of the present invention, a variable frequency air conditioner is provided, comprising a detection device for reverse connection of phase and neutral wires as proposed in the above-described technical solution of the present invention, and / or a readable storage medium as proposed in the above-described technical solution of the present invention. Therefore, the variable frequency air conditioner possesses all the beneficial effects of the detection device for reverse connection of phase and neutral wires as proposed in the above-described technical solution of the present invention and / or the readable storage medium as proposed in the above-described technical solution of the present invention, which will not be elaborated further here.

[0073] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0074] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0075] Figure 1 A schematic diagram of a three-phase detection circuit in the related art is shown;

[0076] Figure 2 This is a schematic flowchart of one embodiment of the detection method for reverse connection of phase and neutral wires according to the present invention;

[0077] Figure 3 A schematic diagram of the three-phase rectifier circuit of an inverter air conditioner according to an embodiment of the present invention is shown;

[0078] Figure 4 The second schematic flowchart of the detection method for reverse connection of phase and neutral wires according to an embodiment of the present invention is shown.

[0079] Figure 5 The third schematic flowchart of the detection method for reverse connection of phase and neutral wires according to an embodiment of the present invention is shown;

[0080] Figure 6 The fourth schematic flowchart of the detection method for reverse connection of phase and neutral wires according to an embodiment of the present invention is shown.

[0081] Figure 7 The fifth flowchart illustrates the detection method for reverse connection of phase and neutral wires according to an embodiment of the present invention.

[0082] Figure 8 One of the schematic block diagrams of a detection device for reverse connection of phase and neutral wires according to an embodiment of the present invention is shown;

[0083] Figure 9 The second schematic block diagram shows a detection device for reverse connection of phase and neutral wires according to an embodiment of the present invention. Detailed Implementation

[0084] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0085] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0086] The following is combined Figures 1 to 9 The present invention provides a detailed description of the detection method, device, storage medium, and variable frequency air conditioner for reverse connection of phase and neutral wires through specific embodiments and application scenarios.

[0087] Example 1:

[0088] Figure 2 A flowchart illustrating a method for detecting reverse connection of phase and neutral wires according to an embodiment of the present invention is shown. This detection method is used in a three-phase rectifier circuit of a variable frequency air conditioner. The three-phase rectifier circuit includes a neutral wire, a DC bus, three phase wires, and a first relay, a second relay, and a third relay located on each phase wire. The detection method includes:

[0089] Step S202: When the first relay, the second relay and the third relay are all closed, obtain the first voltage value of the DC bus.

[0090] Step S204: If any relay is disconnected, obtain the current voltage value of the DC bus;

[0091] Step S206: If the first voltage value is not equal to the current voltage value, determine that one phase line is reversed to the neutral line.

[0092] It should be noted that the phase-neutral reverse connection detection method proposed in this invention is mainly used for the three-phase rectifier circuit of variable frequency air conditioners. The execution subject can be a phase-neutral reverse connection detection device. In order to more clearly explain the phase-neutral reverse connection detection method proposed in this invention, the following embodiments use a phase-neutral reverse connection detection device as the execution subject of the phase-neutral reverse connection detection method for illustrative purposes.

[0093] For example, the three-phase rectifier circuit of a variable frequency air conditioner is as follows: Figure 3 As shown, the neutral line is represented by N, the three phase lines are represented by L1, L2 and L3 respectively, the DC bus is represented by L4, the first relay is represented by RY1 and is set on L1, the second relay is represented by RY2 and is set on L2, and the third relay is represented by RY3 and is set on L3.

[0094] In this embodiment, the three-phase rectifier circuit is the basic power supply circuit for the inverter air conditioner. The phase lines are used to indicate the AC bus of the basic power supply circuit. The first relay, the second relay, and the third relay are respectively installed on the three phase lines to control the disconnection and connection of the three phase lines with the three-phase rectifier circuit.

[0095] Specifically, the detection device first controls the first, second, and third relays to close, and then acquires the current voltage value of the DC bus, i.e., the first voltage value. Specifically, when all three relays are closed, regardless of whether there is a reverse connection between the phase line and neutral line in the three-phase rectifier circuit, the acquired first voltage value is equal to the phase voltage of the phase line. A multiple or equal to the phase line voltage times.

[0096] Furthermore, when the detection device disconnects any of the aforementioned relays, it acquires the current voltage value of the DC bus, that is, it acquires the DC bus voltage value when only the first relay is disconnected, or only the second relay is disconnected, or only the third relay is disconnected.

[0097] Specifically, if any phase line and neutral line in the above three-phase rectifier circuit are reversed, disconnecting any of the above relays will cause the voltage value of the DC bus to change from the original value. Phase doubler voltage drops to The phase voltage is doubled. Therefore, the detection device needs to control any relay to disconnect and obtain the current voltage value of the DC bus so that subsequent steps can determine whether any phase line and neutral line in the three-phase rectifier circuit are reversed based on the current voltage value.

[0098] It should be noted that a voltage sensor is installed on the aforementioned DC bus, and the detection device can obtain the aforementioned first voltage value and the aforementioned current voltage value through the voltage sensor.

[0099] Furthermore, the detection device determines the connection status of any one of the three phase lines and the neutral line based on the aforementioned first voltage value and the aforementioned current voltage value, that is, it determines whether there is a situation where one of the three phase lines is reversed with the neutral line. Specifically, if the aforementioned first voltage value and the aforementioned current voltage value are not equal, it is determined that there is a situation where one phase line is reversed with the neutral line.

[0100] Specifically, the detection device can determine whether the current voltage value of the DC bus drops to a certain level when the relay on any phase line is disconnected. The phase voltage is doubled to determine whether any phase line and neutral line are reversed. Therefore, the detection device can determine whether one of the three phase lines and the neutral line are reversed based on the first voltage value and the current voltage value.

[0101] In this embodiment, the detection device first acquires the first voltage value when the first, second, and third relays are all closed; then, it acquires the current voltage value when any of the relays are open; and finally, it determines whether one of the three phase lines is reverse-connected with the neutral line based on the first voltage value and the current voltage value. In this embodiment of the invention, there is no need to additionally set up a three-phase detection circuit in the power supply circuit of the inverter air conditioner. The connection status of any phase line and neutral line can be determined using only the existing three-phase rectifier circuit of the inverter air conditioner. This facilitates the miniaturization and weight reduction of the power supply circuit of the inverter air conditioner, while also reducing the production cost of the power supply circuit.

[0102] Figure 4 A flowchart illustrating a method for detecting reverse connection of phase and neutral wires according to an embodiment of the present invention is shown. The detection method includes:

[0103] Step S402: When the first relay, the second relay and the third relay are all closed, obtain the first voltage value of the DC bus.

[0104] Step S404: If any relay is disconnected, obtain the current voltage value of the DC bus;

[0105] Step S406: If the first voltage value is not equal to the current voltage value, determine that one phase line is reversed to the neutral line;

[0106] Step S408: If only the first relay is open, obtain the second voltage value of the DC bus; if only the second relay is open, obtain the third voltage value of the DC bus; if only the third relay is open, obtain the fourth voltage value of the DC bus.

[0107] Step S410: Based on the first voltage value, the second voltage value, the third voltage value, and the fourth voltage value, confirm the wiring status of any phase line and neutral line.

[0108] In this embodiment, after the detection device determines that a phase line and a neutral line are reversed, it can further determine which specific phase line and neutral line are reversed. The specific method is as follows: the detection device only controls the first relay to open and obtains the voltage value of the DC bus at this time, i.e., the second voltage value; the detection device only controls the second relay to open and obtains the voltage value of the DC bus at this time, i.e., the third voltage value; the detection device only controls the third relay to open and obtains the voltage value of the DC bus at this time, i.e., the fourth voltage value.

[0109] Furthermore, the detection device determines the connection status of any one of the three phase lines and the neutral line based on the first voltage value, the second voltage value, the third voltage value, and the fourth voltage value, that is, it determines which specific phase line and the neutral line are reversed.

[0110] Specifically, if one phase line and the neutral line in the three-phase rectifier circuit are reversed, disconnecting the first relay, the second relay, or the third relay will change the voltage value of the DC bus from the previous value. Phase doubler voltage drops to The phase voltage is doubled. Therefore, the detection device can determine which of the three phase lines is reverse-connected to the neutral line by obtaining the second, third, and fourth voltage values ​​respectively when only the first, second, or third relays are disconnected.

[0111] In this embodiment, the detection device can determine the connection status of any one phase line and the neutral line by obtaining a second voltage value, a third voltage value, and a fourth voltage value when only the first relay, the second relay, or the third relay is disconnected, even when one phase line and the neutral line are reversed in the three-phase rectifier circuit. This eliminates the need for a separate three-phase detection circuit in the inverter air conditioner's power supply circuit; the connection status of any phase line and the neutral line can be determined using only the existing three-phase rectifier circuit of the inverter air conditioner, facilitating the miniaturization and weight reduction of the inverter air conditioner's power supply circuit.

[0112] Figure 5 A flowchart illustrating a method for detecting reverse connection of phase and neutral wires according to an embodiment of the present invention is shown. The detection method includes:

[0113] Step S502: When the first relay, the second relay and the third relay are all closed, obtain the first voltage value of the DC bus.

[0114] Step S504: If any relay is disconnected, obtain the current voltage value of the DC bus;

[0115] Step S506: If the first voltage value is not equal to the current voltage value, determine that one phase line is reversed to the neutral line;

[0116] Step S508: If only the first relay is open, obtain the second voltage value of the DC bus; if only the second relay is open, obtain the third voltage value of the DC bus; if only the third relay is open, obtain the fourth voltage value of the DC bus.

[0117] Step S510: If both the third voltage value and the fourth voltage value are less than the first voltage value, confirm that the phase line and the neutral line where the first relay is located are reversed.

[0118] In this embodiment, the process by which the detection device determines the connection status of any one of the three phase lines in the three-phase rectifier circuit of the inverter air conditioner with the neutral line is as follows: the detection device determines the voltage value that is less than the first voltage value among the second voltage value, the third voltage value, and the fourth voltage value.

[0119] Specifically, if the detection device determines that both the third voltage value and the fourth voltage value are less than the first voltage value, the detection device determines that the phase line and the neutral line where the first relay is located are reversed.

[0120] Specifically, if the third and fourth voltage values ​​are less than the first voltage value, it indicates that the DC bus voltage value is lower only when the second relay is disconnected, or the DC bus voltage value is lower only when the third relay is disconnected than the normal value. Phase doubler voltage drops to The phase voltage is doubled, meaning that the phase lines of the second and third relays are not reverse-connected to the neutral line. Therefore, it can be determined that the phase line of the first relay is reverse-connected to the neutral line.

[0121] In this embodiment, after determining that one phase line and the neutral line are reversed in the three-phase rectifier circuit of the inverter air conditioner, the detection device can determine which of the three phase lines is reversed with the neutral line based on the specific relationship between the second voltage value, the third voltage value, the fourth voltage value and the first voltage value, so as to facilitate the rapid handling of the reverse connection fault in subsequent steps.

[0122] Figure 6 A flowchart illustrating a method for detecting reverse connection of phase and neutral wires according to an embodiment of the present invention is shown. The detection method includes:

[0123] Step S602: When the first relay, the second relay and the third relay are all closed, obtain the first voltage value of the DC bus.

[0124] Step S604: If any relay is disconnected, obtain the current voltage value of the DC bus;

[0125] Step S606: If the first voltage value is not equal to the current voltage value, determine that one phase line is reversed to the neutral line;

[0126] Step S608: If only the first relay is open, obtain the second voltage value of the DC bus; if only the second relay is open, obtain the third voltage value of the DC bus; if only the third relay is open, obtain the fourth voltage value of the DC bus.

[0127] Step S610: If both the second voltage value and the fourth voltage value are less than the first voltage value, confirm that the phase line of the second relay is reversed with the neutral line.

[0128] In this embodiment, the process by which the detection device determines the connection status of any one of the three phase lines in the three-phase rectifier circuit of the inverter air conditioner with the neutral line is as follows: the detection device determines the voltage value that is less than the first voltage value among the second voltage value, the third voltage value, and the fourth voltage value.

[0129] Specifically, if the detection device determines that both the second voltage value and the fourth voltage value are less than the first voltage value, the detection device determines that the phase line and the neutral line where the second relay is located are reversed.

[0130] Specifically, if both the second and fourth voltage values ​​are less than the first voltage value, it indicates that the DC bus voltage value is only lower when the first relay is disconnected, or only lower when the third relay is disconnected, compared to the normal voltage value. Phase doubler voltage drops to The phase voltage is doubled, meaning that the phase lines of the first and third relays are not reverse-connected to the neutral line. Therefore, it can be determined that the phase line of the second relay is reverse-connected to the neutral line.

[0131] In this embodiment, after determining that one phase line and the neutral line are reversed in the three-phase rectifier circuit of the inverter air conditioner, the detection device can determine which of the three phase lines is reversed with the neutral line based on the specific relationship between the second voltage value, the third voltage value, the fourth voltage value and the first voltage value, so as to facilitate the rapid handling of the reverse connection fault in subsequent steps.

[0132] Figure 7 A flowchart illustrating a method for detecting reverse connection of phase and neutral wires according to an embodiment of the present invention is shown. The detection method includes:

[0133] Step S702: When the first relay, the second relay and the third relay are all closed, obtain the first voltage value of the DC bus.

[0134] Step S704: If any relay is disconnected, obtain the current voltage value of the DC bus;

[0135] Step S706: If the first voltage value is not equal to the current voltage value, determine that one phase line is reversed to the neutral line;

[0136] Step S708: If only the first relay is open, obtain the second voltage value of the DC bus; if only the second relay is open, obtain the third voltage value of the DC bus; if only the third relay is open, obtain the fourth voltage value of the DC bus.

[0137] Step S710: If the second voltage value and the third voltage value are less than the first voltage value, confirm that the phase line of the third relay is reversed with the neutral line.

[0138] In this embodiment, the process by which the detection device determines the connection status of any one of the three phase lines in the three-phase rectifier circuit of the inverter air conditioner with the neutral line is as follows: the detection device determines the voltage value that is less than the first voltage value among the second voltage value, the third voltage value, and the fourth voltage value.

[0139] Specifically, if the detection device determines that both the second voltage value and the third voltage value are less than the first voltage value, the detection device determines that the phase line and the neutral line where the third relay is located are reversed.

[0140] Specifically, if both the second and third voltage values ​​are less than the first voltage value, it indicates that the DC bus voltage value is lower only when the first relay is disconnected, or the DC bus voltage value is lower only when the second relay is disconnected than the normal value. Phase doubler voltage drops to The phase voltage is doubled, meaning that the phase lines where the first and second relays are located are not reverse-connected to the neutral line. Therefore, it can be determined that the phase line where the third relay is located is reverse-connected to the neutral line.

[0141] In this embodiment, after determining that one phase line and the neutral line are reversed in the three-phase rectifier circuit of the inverter air conditioner, the detection device can determine which of the three phase lines is reversed with the neutral line based on the specific relationship between the second voltage value, the third voltage value, the fourth voltage value and the first voltage value, so as to facilitate the rapid handling of the reverse connection fault in subsequent steps.

[0142] Example 2:

[0143] Figure 8 A schematic block diagram of a phase-neutral reverse connection detection device according to an embodiment of the present invention is shown. This phase-neutral reverse connection detection device 800 is used in a three-phase rectifier circuit of a variable frequency air conditioner. The three-phase rectifier circuit includes a neutral wire, a DC bus, three phase wires, and a first relay, a second relay, and a third relay located on each phase wire. The detection device includes: an acquisition module 802, used to acquire a first voltage value of the DC bus when all three relays are closed; the acquisition module 802 is also used to acquire the current voltage value of the DC bus when any relay is open; and a processing module 804, used to determine that a phase wire is reverse-connected to the neutral wire when the first voltage value is not equal to the current voltage value.

[0144] In this embodiment, the three-phase rectifier circuit is the basic power supply circuit for the inverter air conditioner. The phase lines are used to indicate the AC bus of the basic power supply circuit. The first relay, the second relay, and the third relay are respectively installed on the three phase lines to control the disconnection and connection of the three phase lines with the three-phase rectifier circuit.

[0145] Specifically, the acquisition module 802 first acquires the current voltage value of the DC bus, i.e., the first voltage value, when all three relays (first, second, and third) are closed. Specifically, when all three relays are closed, regardless of whether there is a reverse connection between the phase line and neutral line in the three-phase rectifier circuit, the acquired first voltage value is equal to the phase voltage of the phase line. A multiple or equal to the phase line voltage times.

[0146] Furthermore, when any of the aforementioned relays is disconnected, the acquisition module 802 acquires the current voltage value of the DC bus, that is, acquires the voltage value of the DC bus when only the first relay is disconnected, or only the second relay is disconnected, or only the third relay is disconnected.

[0147] Specifically, if any phase line and neutral line in the above three-phase rectifier circuit are reversed, disconnecting any of the above relays will cause the voltage value of the DC bus to change from the original value. Phase doubler voltage drops to The phase voltage is doubled. Therefore, the acquisition module 802 needs to acquire the current voltage value of the DC bus when any relay is open, so that the subsequent processing module 804 can determine whether any phase line and neutral line are reversed in the three-phase rectifier circuit based on the current voltage value.

[0148] It should be noted that a voltage sensor is installed on the DC bus, and the acquisition module 802 can acquire the first voltage value and the current voltage value through the voltage sensor.

[0149] Furthermore, the processing module 804 determines the connection status of any one of the three phase lines and the neutral line based on the first voltage value and the current voltage value, that is, it determines whether there is a situation where one of the three phase lines is reversed with the neutral line. Specifically, if the first voltage value and the current voltage value are not equal, it is determined that there is a situation where one phase line is reversed with the neutral line.

[0150] Specifically, the processing module 804 can determine whether the current voltage value of the DC bus drops to a certain level when the relay on any phase line is disconnected. The phase voltage is doubled to determine whether any phase line and neutral line are reversed. Therefore, the detection device can determine whether one of the three phase lines and the neutral line are reversed based on the first voltage value and the current voltage value.

[0151] In this embodiment, the acquisition module 802 first acquires the first voltage value when the first relay, the second relay, and the third relay are all closed; and acquires the current voltage value when any of the relays are open. The processing module 804 determines, based on the first voltage value and the current voltage value, whether one of the three phase lines is reverse-connected with the neutral line. In this embodiment of the invention, there is no need to set up a separate three-phase detection circuit in the power supply circuit of the inverter air conditioner. The connection status of any phase line and the neutral line can be determined using only the existing three-phase rectifier circuit of the inverter air conditioner. This facilitates the miniaturization and weight reduction of the power supply circuit of the inverter air conditioner, and also reduces the production cost of the power supply circuit of the inverter air conditioner.

[0152] Furthermore, the detection device 800 for reverse connection of phase and neutral wires according to the above embodiments of the present invention may also have the following additional technical features:

[0153] In the above embodiments, the acquisition module 802 is further configured to acquire a second voltage value of the DC bus when only the first relay is disconnected, acquire a third voltage value of the DC bus when only the second relay is disconnected, and acquire a fourth voltage value of the DC bus when only the third relay is disconnected; the processing module 804 is further configured to confirm the wiring status of any phase line and neutral line based on the first voltage value, the second voltage value, the third voltage value and the fourth voltage value.

[0154] In this embodiment, after the processing device determines that a phase line and a neutral line are reversed, it can also determine which specific phase line and neutral line are reversed. The specific method is as follows: first, the acquisition module 802 acquires the second voltage value of the DC bus when only the first relay is open; acquires the third voltage value of the DC bus when only the second relay is open; and acquires the fourth voltage value of the DC bus when only the third relay is open.

[0155] Furthermore, the processing module 804 determines the connection status of any one of the three phase lines and the neutral line based on the first voltage value, the second voltage value, the third voltage value, and the fourth voltage value, that is, it determines which specific phase line and the neutral line are reversed.

[0156] Specifically, if one phase line and the neutral line in the three-phase rectifier circuit are reversed, disconnecting the first relay, the second relay, or the third relay will change the voltage value of the DC bus from the previous value. Phase doubler voltage drops to The phase voltage is doubled. Therefore, the processing module 804 can determine which of the three phase lines is reverse-connected to the neutral line by obtaining the second voltage value, the third voltage value, and the fourth voltage value respectively when the acquisition module 802 disconnects only the first relay, the second relay, or the third relay.

[0157] In this embodiment, the processing module 804, when it is determined that one phase line and the neutral line are reverse-connected in the three-phase rectifier circuit, can determine the connection status of any one phase line and the neutral line by obtaining the second voltage value, the third voltage value, and the fourth voltage value respectively when only the first relay, the second relay, or the third relay is disconnected. This eliminates the need to set up a separate three-phase detection circuit in the power supply circuit of the inverter air conditioner, and can determine the connection status of any phase line and the neutral line using only the existing three-phase rectifier circuit of the inverter air conditioner, which facilitates the miniaturization and weight reduction of the power supply circuit of the inverter air conditioner.

[0158] In the above embodiment, the processing module 804 is further configured to confirm that the phase line and the neutral line of the first relay are reversed when both the third voltage value and the fourth voltage value are less than the first voltage value.

[0159] In this embodiment, the process by which the processing module 804 determines the connection status of any one of the three phase lines and the neutral line in the three-phase rectifier circuit of the inverter air conditioner is as follows: the processing module 804 determines the voltage value that is less than the first voltage value among the second voltage value, the third voltage value, and the fourth voltage value.

[0160] Specifically, when the processing module 804 determines that both the third voltage value and the fourth voltage value are less than the first voltage value, the processing module 804 determines that the phase line and the neutral line where the first relay is located are reversed.

[0161] Specifically, if the third and fourth voltage values ​​are less than the first voltage value, it indicates that the DC bus voltage value is lower only when the second relay is disconnected, or the DC bus voltage value is lower only when the third relay is disconnected than the normal value. Phase doubler voltage drops to The phase voltage is doubled, meaning that the phase lines of the second and third relays are not reverse-connected to the neutral line. Therefore, it can be determined that the phase line of the first relay is reverse-connected to the neutral line.

[0162] In this embodiment, after determining that one phase line and the neutral line are reversed in the three-phase rectifier circuit of the inverter air conditioner, the processing module 804 can determine which of the three phase lines is reversed with the neutral line based on the specific relationship between the second voltage value, the third voltage value, the fourth voltage value and the first voltage value, so as to facilitate the rapid handling of the reverse connection fault in subsequent steps.

[0163] In the above embodiment, the processing module 804 is further configured to confirm that the phase line and the neutral line of the second relay are reversed when both the second voltage value and the fourth voltage value are less than the first voltage value.

[0164] In this embodiment, the process by which the processing module 804 determines the connection status of any one of the three phase lines and the neutral line in the three-phase rectifier circuit of the inverter air conditioner is as follows: the processing module 804 determines the voltage value that is less than the first voltage value among the second voltage value, the third voltage value, and the fourth voltage value.

[0165] Specifically, when the processing module 804 determines that both the second voltage value and the fourth voltage value are less than the first voltage value, the processing module 804 determines that the phase line and the neutral line where the second relay is located are reversed.

[0166] Specifically, if both the second and fourth voltage values ​​are less than the first voltage value, it indicates that the DC bus voltage value is only lower when the first relay is disconnected, or only lower when the third relay is disconnected, compared to the normal voltage value. Phase doubler voltage drops to The phase voltage is doubled, meaning that the phase lines of the first and third relays are not reverse-connected to the neutral line. Therefore, it can be determined that the phase line of the second relay is reverse-connected to the neutral line.

[0167] In this embodiment, after determining that one phase line and the neutral line are reversed in the three-phase rectifier circuit of the inverter air conditioner, the processing module 804 can determine which of the three phase lines is reversed with the neutral line based on the specific relationship between the second voltage value, the third voltage value, the fourth voltage value and the first voltage value, so as to facilitate the rapid handling of the reverse connection fault in subsequent steps.

[0168] In the above embodiment, the processing module 804 is further configured to confirm that the phase line of the third relay is reversed with the neutral line when the second voltage value and the third voltage value are less than the first voltage value.

[0169] In this embodiment, the process by which the processing module 804 determines the connection status of any one of the three phase lines and the neutral line in the three-phase rectifier circuit of the inverter air conditioner is as follows: the processing module 804 determines the voltage value that is less than the first voltage value among the second voltage value, the third voltage value, and the fourth voltage value.

[0170] Specifically, when the processing module 804 determines that both the second voltage value and the third voltage value are less than the first voltage value, the processing module 804 determines that the phase line and the neutral line where the third relay is located are reversed.

[0171] Specifically, if both the second and third voltage values ​​are less than the first voltage value, it indicates that the DC bus voltage value is lower only when the first relay is disconnected, or the DC bus voltage value is lower only when the second relay is disconnected than the normal value. Phase doubler voltage drops to The phase voltage is doubled, meaning that the phase lines where the first and second relays are located are not reverse-connected to the neutral line. Therefore, it can be determined that the phase line where the third relay is located is reverse-connected to the neutral line.

[0172] In this embodiment, after determining that one phase line and the neutral line are reversed in the three-phase rectifier circuit of the inverter air conditioner, the processing module 804 can determine which of the three phase lines is reversed with the neutral line based on the specific relationship between the second voltage value, the third voltage value, the fourth voltage value and the first voltage value, so as to facilitate the rapid handling of the reverse connection fault in subsequent steps.

[0173] Example 3:

[0174] Figure 9 A schematic block diagram of a phase-neutral reverse connection detection device according to an embodiment of the present invention is shown. The phase-neutral reverse connection detection device 900 includes: a memory 902 storing a program or instructions; and a processor 904 executing the program or instructions stored in the memory 902 to implement the steps of the phase-neutral reverse connection detection method proposed in the above embodiments of the present invention. Therefore, it has all the beneficial technical effects of the phase-neutral reverse connection detection method proposed in the above embodiments of the present invention, and will not be described in detail here.

[0175] Example 4:

[0176] According to a fourth embodiment of the present invention, a readable storage medium is provided, on which a program or instructions are stored. When the program or instructions are executed by a processor, they implement the detection method for reverse connection of phase and neutral wires as proposed in the above embodiments of the present invention. Therefore, this readable storage medium possesses all the beneficial effects of the detection method for reverse connection of phase and neutral wires proposed in the above embodiments of the present invention, which will not be elaborated further here.

[0177] Example 5:

[0178] According to a fifth embodiment of the present invention, a variable frequency air conditioner is provided, including a detection device for reverse connection of phase and neutral wires as proposed in the above embodiments of the present invention, and / or a readable storage medium as proposed in the above embodiments of the present invention. Therefore, the variable frequency air conditioner has all the beneficial effects of the detection device for reverse connection of phase and neutral wires proposed in the above embodiments of the present invention and / or the readable storage medium proposed in the above embodiments of the present invention, which will not be repeated here.

[0179] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance, unless otherwise expressly specified and limited. The terms "connection," "installation," and "fixing," etc., should be interpreted broadly. For example, "connection" can mean a fixed connection, a detachable connection, or an integral connection; it can mean a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0180] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0181] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0182] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for detecting phase and neutral reverse connection, characterized in that, The three-phase rectification circuit for the variable frequency air conditioner comprises a zero line, a direct current bus, three phase lines and first, second and third relays respectively located on each of the phase lines, and the detection method comprises: In the case that the first, second and third relays are all closed, a first voltage value of the direct current bus is acquired; In the case that any of the relays is opened, a current voltage value of the direct current bus is acquired; In the case that the first voltage value is not equal to the current voltage value, it is determined that one phase line is reversely connected with the zero line; After the determination that one phase line is reversely connected with the zero line, the method further comprises: In the case that only the first relay is opened, a second voltage value of the direct current bus is acquired, in the case that only the second relay is opened, a third voltage value of the direct current bus is acquired, and in the case that only the third relay is opened, a fourth voltage value of the direct current bus is acquired; According to the first, second, third and fourth voltage values, the connection state of any of the phase lines and the zero line is confirmed; The direct current bus is provided with a voltage sensor, and the first voltage value and the current voltage value are acquired by the voltage sensor; According to the first, second, third and fourth voltage values, the connection state of any of the phase lines and the zero line is confirmed, specifically comprising: In the case that the third voltage value and the fourth voltage value are both less than the first voltage value, it is determined that the phase line where the first relay is located is reversely connected with the zero line; According to the first, second, third and fourth voltage values, the connection state of any of the phase lines and the zero line is confirmed, specifically comprising: In the case that the second voltage value and the fourth voltage value are both less than the first voltage value, it is determined that the phase line where the second relay is located is reversely connected with the zero line; According to the first, second, third and fourth voltage values, the connection state of any of the phase lines and the zero line is confirmed, specifically comprising: In the case that the second voltage value and the third voltage value are less than the first voltage value, it is determined that the phase line where the third relay is located is reversely connected with the zero line.

2. A detection device for phase and neutral reverse connection, characterized in that, The three-phase rectification circuit for the variable frequency air conditioner comprises a zero line, a direct current bus, three phase lines and first, second and third relays respectively located on each of the phase lines, and the detection device comprises: An acquisition module is configured to acquire a first voltage value of the direct current bus in the case that the first, second and third relays are all closed; The acquisition module is further configured to acquire a current voltage value of the direct current bus in the case that any of the relays is opened; A processing module is configured to determine that one phase line is reversely connected with the zero line in the case that the first voltage value is not equal to the current voltage value; The acquisition module is further configured to acquire a second voltage value of the DC bus when only the first relay is open, acquire a third voltage value of the DC bus when only the second relay is open, and acquire a fourth voltage value of the DC bus when only the third relay is open; The processing module is further configured to determine the connection state of any of the phase line and the neutral line according to the first voltage value, the second voltage value, the third voltage value, and the fourth voltage value; The DC bus is provided with a voltage sensor, and the first voltage value and the current voltage value are acquired by the voltage sensor; The processing module is further configured to determine that the phase line where the first relay is located is reversely connected with the neutral line when the third voltage value and the fourth voltage value are both less than the first voltage value; The processing module is further configured to determine that the phase line where the second relay is located is reversely connected with the neutral line when the second voltage value and the fourth voltage value are both less than the first voltage value; The processing module is further configured to determine that the phase line where the third relay is located is reversely connected with the neutral line when the second voltage value and the third voltage value are both less than the first voltage value.

3. A detection device for phase and neutral reverse connection, characterized in that, The method comprises the steps of: The memory stores a program, and the processor implements the steps of the method for detecting the reverse connection of the phase line and the neutral line according to the program.

4. A readable storage medium, characterized by, The readable storage medium stores a program or instructions, and the program or instructions are executed by the processor to implement the steps of the method for detecting the reverse connection of the phase line and the neutral line according to claim 1.

5. A variable frequency air conditioner characterized by comprising: The device comprises: The device for detecting the reverse connection of the phase line and the neutral line according to claim 2 or 3; And / or The readable storage medium according to claim 4.

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