CN114994572A

CN114994572A - Phase line zero line reverse connection detection method and device, storage medium and variable frequency air conditioner

Info

Publication number: CN114994572A
Application number: CN202210619652.8A
Authority: CN
Inventors: 黄俊豪; 王豪浩; 张世洪
Original assignee: GD Midea Heating and Ventilating Equipment Co Ltd; Hefei Midea Heating and Ventilating Equipment Co Ltd
Current assignee: GD Midea Heating and Ventilating Equipment Co Ltd; Hefei Midea Heating and Ventilating Equipment Co Ltd
Priority date: 2022-06-02
Filing date: 2022-06-02
Publication date: 2022-09-02
Also published as: WO2023231755A1

Abstract

The invention provides a detection method and a device for the reverse connection of phase line zero lines, a storage medium and a variable frequency air conditioner, wherein the detection method is used for a three-phase rectification circuit of the variable frequency air conditioner, the three-phase rectification circuit comprises the zero line, a direct current bus, three phase lines, a first relay, a second relay and a third relay, and the first relay, the second relay and the third relay are respectively positioned on each phase line, and the detection method comprises the following steps: under the condition that the first relay, the second relay and the third relay are all closed, a first voltage value of the direct current bus is obtained; under the condition that any relay is disconnected, the current voltage value of the direct current bus is obtained; and determining that one phase line is reversely connected with the zero line under the condition that the first voltage value is not equal to the current voltage value. In the technical scheme of the invention, a three-phase detection circuit is not required to be additionally arranged in the power circuit of the variable frequency air conditioner, and the judgment of the wiring state of the phase line and the zero line can be realized only by the three-phase rectification circuit of the existing variable frequency air conditioner, so that the power circuit of the variable frequency air conditioner is convenient to miniaturize and lighten.

Description

Detection method and device for phase line zero line reverse connection, storage medium and variable frequency air conditioner

Technical Field

The invention relates to the technical field of power adaptability, in particular to a method and a device for detecting reverse connection of phase line zero lines, a storage medium and a variable frequency air conditioner.

Background

In the related art, in order to avoid that the phase line and the zero line of the inverter air conditioner are connected reversely, a three-phase detection circuit shown in the attached drawing 1 is generally used for detecting, the principle is that the phase angle generated by an optical coupler is judged according to the periodic change of the phase line to the zero line voltage, although the cost is not high, the occupied area is large, three special function pins of a main control chip need to be occupied, and the miniaturization and the light weight of the main control chip are not facilitated.

Disclosure of Invention

The present invention has been made to solve at least one of the problems occurring in the related art.

To this end, a first aspect of the present invention is to provide a method for detecting a phase line zero line reverse connection.

A second aspect of the present invention is to provide a device for detecting the reverse connection of the zero lines of the phase lines.

The third aspect of the invention is to provide a device for detecting the reverse connection of the zero lines of the phase lines.

A fourth aspect of the invention is directed to a readable storage medium.

A fifth aspect of the present invention is to provide an inverter air conditioner.

In view of the above, according to an aspect of the present invention, a method for detecting reverse connection of phase lines and zero lines is provided, where the method is used for a three-phase rectification circuit of a variable frequency air conditioner, the three-phase rectification circuit includes a zero line, a dc bus, three phase lines, and a first relay, a second relay, and a third relay respectively located on each phase line, and the method includes: under the condition that the first relay, the second relay and the third relay are all closed, a first voltage value of the direct current bus is obtained; under the condition that any relay is disconnected, the current voltage value of the direct current bus is obtained; and determining that one phase line is reversely connected with the zero line under the condition that the first voltage value is not equal to the current voltage value.

It should be noted that the detection method for the reverse connection of the phase line and the zero line provided by the present invention is mainly used for a three-phase rectification circuit of a variable frequency air conditioner, and an execution main body of the detection method for the reverse connection of the phase line and the zero line provided by the present invention may be a detection device for the reverse connection of the phase line and the zero line.

In the technical scheme, the three-phase rectification circuit is a basic power supply circuit of the inverter air conditioner, the phase lines are used for indicating an alternating current bus of the basic power supply circuit, and the first relay, the second relay and the third relay are respectively arranged on the three phase lines and used for controlling the three phase lines to be disconnected and connected with the three-phase rectification circuit.

Specifically, the detection device first controls the first relay, the second relay, and the third relay to be closed, and then obtains a current voltage value of the dc bus, that is, the first voltage value. Specifically, when the first relay, the second relay, and the third relay are all in the closed state, the first voltage value obtained is equal to the phase voltage of the phase line regardless of whether the phase line and the zero line are reversely connected in the three-phase rectification circuit or not

Multiple or equal to the phase line voltage

And (4) doubling.

Furthermore, when the detection device opens any one of the relays, the current voltage value of the direct current bus is obtained, namely the voltage value of the direct current bus is obtained when only the first relay is controlled to be opened, only the second relay is controlled to be opened, or only the third relay is controlled to be opened.

Specifically, if there is a situation where any one of the phase lines and the neutral line are reversely connected in the three-phase rectification circuit,when any relay is disconnected, the voltage value of the direct current bus can be controlled

Voltage of double phase is reduced to

The voltage of the phase is doubled. Therefore, the detection device needs to control any relay to be switched off, and obtains the current voltage value of the direct current bus, so that whether any phase line and the zero line are reversely connected in the three-phase rectification circuit or not can be judged in the subsequent steps according to the current voltage value.

In addition, a voltage sensor is disposed on the dc bus, and the detection device may acquire the first voltage value and the current voltage value through the voltage sensor.

Further, the detection device judges the wiring state of any one of the three phase lines and the zero line according to the first voltage value and the current voltage value, namely, judges whether one of the three phase lines and the zero line are reversely connected. Specifically, in the case where the first voltage value and the current voltage value are not equal, it is determined that there is a case where one phase line is reversely connected to the zero line.

Specifically, the detection device can detect whether the current voltage value of the direct current bus falls to the current voltage value of the direct current bus when the relay on any phase line is disconnected

And multiplying the phase voltage to determine whether any phase line and zero line are reversely connected, so that the detection device can judge whether one phase line and the zero line in the three phase lines are reversely connected according to the first voltage value and the current voltage value.

In this technical solution, the detection device first obtains the first voltage value when the first relay, the second relay, and the third relay are all in a closed state; under the condition that any one relay is disconnected, the current voltage value is obtained; and then judging whether one phase line and the zero line are reversely connected or not according to the first voltage value and the current voltage value. In the technical scheme of the invention, a three-phase detection circuit is not required to be additionally arranged in the power supply circuit of the inverter air conditioner, and the judgment of the wiring state of any phase line and zero line can be realized only by the three-phase rectification circuit of the existing inverter air conditioner, so that the power supply circuit of the inverter air conditioner is convenient to miniaturize and lighten, and the production cost of the power supply circuit of the inverter air conditioner can be reduced.

In addition, the method for detecting the reverse connection of the phase line and the zero line, which is provided by the technical scheme of the invention, can also have the following additional technical characteristics:

in the above technical solution, after determining that one phase line is reversely connected to the zero line, the detection method further includes: the method comprises the steps that a second voltage value of the direct current bus is obtained under the condition that only a first relay is turned off, a third voltage value of the direct current bus is obtained under the condition that only a second relay is turned off, and a fourth voltage value of the direct current bus is obtained under the condition that only a third relay is turned off; and confirming the wiring state of any phase line and the zero line according to the first voltage value, the second voltage value, the third voltage value and the fourth voltage value.

In this technical scheme, after detection device confirms the condition that a phase line exists with the reversal of zero line, can also judge specific phase line and zero line reversal, its specific mode is: the detection device only controls the first relay to be switched off, and obtains the voltage value of the direct current bus at the moment, namely the second voltage value; the detection device only controls the second relay to be switched off, and obtains the voltage value of the direct current bus at the moment, namely the third voltage value; the detection device only controls the third relay to be switched off, and obtains the voltage value of the direct current bus at the moment, namely the fourth voltage value.

Further, the detection device determines the connection state of any one of the three phase lines and the zero line according to the first voltage value, the second voltage value, the third voltage value and the fourth voltage value, that is, determines which phase line and zero line of the three phase lines are reversely connected.

Specifically, if one phase line and the zero line in the three-phase rectification circuit are reversely connected, the three-phase rectification circuit is disconnectedThe voltage value of the DC bus is controlled by the first relay, the second relay or the third relay

The voltage of the double phase is reduced to

And multiplying the phase voltage. Therefore, the detection device can respectively obtain the second voltage value, the third voltage value and the fourth voltage value according to the condition that the first relay, the second relay or the third relay is only disconnected, and can judge which specific phase line of the three phase lines is reversely connected with the zero line.

In the technical scheme, the detection device can judge the wiring state of any one of the three phase lines and the zero line by respectively obtaining the second voltage value, the third voltage value and the fourth voltage value when only the first relay, the second relay or the third relay is disconnected respectively under the condition that the phase line and the zero line are reversely connected in the three-phase rectification circuit. The judgment of the wiring state of any phase line and zero line can be realized only through the three-phase rectification circuit of the existing variable frequency air conditioner without additionally arranging a three-phase detection circuit in the power circuit of the variable frequency air conditioner, so that the power circuit of the variable frequency air conditioner is convenient to miniaturize and lighten.

In the above technical solution, the step of determining the wiring state of any one of the phase line and the zero line according to the first voltage value, the second voltage value, the third voltage value and the fourth voltage value specifically includes: and under the condition that the third voltage value and the fourth voltage value are both smaller than the first voltage value, determining that the phase line where the first relay is located is reversely connected with the zero line.

In the technical scheme, the process of determining the wiring state of any one of three phase lines and a zero line in a three-phase rectification circuit of the variable frequency air conditioner by the detection device comprises the following steps: the detection device determines a voltage value smaller than the first voltage value among the second voltage value, the third voltage value, and the fourth voltage value.

Specifically, under the condition that the detection device determines that the third voltage value and the fourth voltage value are both smaller than the first voltage value, the detection device determines that the phase line where the first relay is located is reversely connected with the zero line.

Specifically, if the third voltage value and the fourth voltage value are smaller than the first voltage value, it indicates that the voltage value of the dc bus when only the second relay is turned off or the voltage value of the dc bus when only the third relay is turned off is normal

The voltage of the double phase is reduced to

The phase line of the second relay and the phase line of the third relay are not in reverse connection with the zero line, so that the condition that the phase line of the first relay is in reverse connection with the zero line can be determined.

In the technical scheme, after it is determined that one phase line and the zero line are reversely connected in the three-phase rectification circuit of the variable frequency air conditioner, the detection device can determine which specific phase line is reversely connected with the zero line in the three phase lines according to the specific size relation between the second voltage value, the third voltage value and the fourth voltage value and the first voltage value, so that the reverse connection fault can be rapidly processed in the subsequent steps.

In the above technical solution, the step of determining the wiring state of any one of the phase line and the zero line according to the first voltage value, the second voltage value, the third voltage value and the fourth voltage value specifically includes: and under the condition that the second voltage value and the fourth voltage value are both smaller than the first voltage value, determining that the phase line where the second relay is located is reversely connected with the zero line.

Specifically, under the condition that the detection device judges that the second voltage value and the fourth voltage value are both smaller than the first voltage value, the detection device determines that the phase line where the second relay is located is reversely connected with the zero line.

Specifically, if both the second voltage value and the fourth voltage value are smaller than the first voltage value, it indicates that the voltage value of the dc bus when only the first relay is turned off or the voltage value of the dc bus when only the third relay is turned off is normal

The voltage of the double phase is reduced to

The phase line voltage of the double phase, namely the phase line where the first relay and the third relay are located, is not in reverse connection with the zero line, so that the situation that the phase line where the second relay is located is in reverse connection with the zero line can be determined.

In the above technical solution, the step of determining the wiring state of any one of the phase line and the zero line according to the first voltage value, the second voltage value, the third voltage value and the fourth voltage value specifically includes: and under the condition that the second voltage value and the third voltage value are smaller than the first voltage value, determining that the phase line where the third relay is located is reversely connected with the zero line.

Specifically, under the condition that the detection device judges that the second voltage value and the third voltage value are both smaller than the first voltage value, the detection device determines that the phase line where the third relay is located is reversely connected with the zero line.

Specifically, if both the second voltage value and the third voltage value are smaller than the first voltage value, it indicates that the voltage value of the dc bus when only the first relay is turned off or the voltage value of the dc bus when only the second relay is turned off is normal

The voltage of the double phase is reduced to

The phase line voltage of the double phase, namely the phase line where the first relay and the second relay are located, is not in reverse connection with the zero line, so that the situation that the phase line where the third relay is located is in reverse connection with the zero line can be determined.

According to a second aspect of the present invention, there is provided a detection apparatus for detecting reverse connection of phase lines and zero lines, which is used for a three-phase rectification circuit of a variable frequency air conditioner, wherein the three-phase rectification circuit includes a zero line, a dc bus, three phase lines, and a first relay, a second relay and a third relay respectively located on each phase line, and the detection apparatus includes: the acquisition module is used for acquiring a first voltage value of the direct current bus under the condition that the first relay, the second relay and the third relay are all closed; the acquisition module is also used for acquiring the current voltage value of the direct current bus under the condition that any relay is disconnected; and the processing module is used for determining that one phase line is reversely connected with the zero line under the condition that the first voltage value is not equal to the current voltage value.

Specifically, the obtaining module first obtains a current voltage value of the dc bus, that is, the first voltage value, when the first relay, the second relay, and the third relay are all closed. Specifically, when the first relay, the second relay, and the third relay are all in the closed state, the first voltage value obtained is equal to the phase voltage of the phase line regardless of whether the phase line and the zero line are reversely connected in the three-phase rectification circuit or not

Multiple or equal to the phase line voltage

And (4) doubling.

Further, the obtaining module obtains the current voltage value of the dc bus when any one of the relays is turned off, that is, the voltage value of the dc bus when only the first relay is controlled to be turned off, only the second relay is controlled to be turned off, or only the third relay is controlled to be turned off.

Specifically, if any phase line and zero line in the three-phase rectification circuit are reversely connected, any relay is switched off, and the voltage value of the direct current bus is changed from the voltage value of the direct current bus

The voltage of the double phase is reduced to

The voltage of the phase is doubled. Therefore, the obtaining module needs to obtain the current voltage value of the direct current bus under the condition that any relay is disconnected, so that the processing module in the subsequent step judges whether any phase line and zero line are reversely connected in the three-phase rectifying circuit according to the current voltage value.

It should be noted that a voltage sensor is disposed on the dc bus, and the obtaining module may obtain the first voltage value and the current voltage value through the voltage sensor.

Further, the processing module judges the wiring state of any one of the three phase lines and the zero line according to the first voltage value and the current voltage value, namely judges whether one of the three phase lines is reversely connected with the zero line. Specifically, in the case where the first voltage value and the current voltage value are not equal, it is determined that there is a case where one phase line is reversely connected to the zero line.

Specifically, the processing module can determine whether the current voltage value of the direct current bus decreases to the value corresponding to the current voltage value of the direct current bus when the relay on any phase line is disconnected

In this technical solution, the obtaining module first obtains the first voltage value when the first relay, the second relay, and the third relay are all in a closed state; under the condition that any one relay is disconnected, the current voltage value is obtained; and the processing module judges whether one phase line and the zero line are reversely connected or not according to the first voltage value and the current voltage value. In the technical scheme of the invention, a three-phase detection circuit is not required to be additionally arranged in the power supply circuit of the inverter air conditioner, and the judgment of the wiring state of any phase line and zero line can be realized only by the three-phase rectification circuit of the existing inverter air conditioner, so that the power supply circuit of the inverter air conditioner is convenient to miniaturize and lighten, and the production cost of the power supply circuit of the inverter air conditioner can be reduced.

In addition, the detection device for the reverse connection of the phase line and the zero line, which is provided by the technical scheme of the invention, can also have the following additional technical characteristics:

in the above technical solution, the obtaining module is further configured to obtain a second voltage value of the dc bus when only the first relay is turned off, obtain a third voltage value of the dc bus when only the second relay is turned off, and obtain a fourth voltage value of the dc bus when only the third relay is turned off; the processing module is further used for confirming the wiring state of any phase line and the zero line according to the first voltage value, the second voltage value, the third voltage value and the fourth voltage value.

In this technical scheme, after processing apparatus confirms that a phase line and the circumstances of the transposition of zero line existence, can also judge concrete phase line and zero line transposition, its specific mode is: firstly, when only the first relay is disconnected, a second voltage value of the direct current bus is obtained through an obtaining module; when only the second relay is switched off, acquiring a third voltage value of the direct current bus; and when only the third relay is switched off, acquiring a fourth voltage value of the direct current bus.

Further, the processing module judges the wiring state of any one of the three phase lines and the zero line according to the first voltage value, the second voltage value, the third voltage value and the fourth voltage value, namely, judges which phase line and zero line of the three phase lines are reversely connected.

Specifically, if one phase line and the zero line in the three-phase rectification circuit are reversely connected, the first relay, the second relay or the third relay is turned off, and the voltage value of the direct current bus is changed from the first value to the second value

The voltage of the double phase is reduced to

The voltage of the phase is doubled. Therefore, the processing module can respectively obtain the second voltage value, the third voltage value and the fourth voltage value according to the fact that the obtaining module only disconnects the first relay, the second relay or the third relay, and can judge which specific phase line of the three phase lines is reversely connected with the zero line.

In the technical scheme, the processing module can judge the wiring state of any one of the three phase lines and the zero line by respectively obtaining the second voltage value, the third voltage value and the fourth voltage value when only the first relay, the second relay or the third relay is disconnected respectively under the condition that the phase line and the zero line are reversely connected in the three-phase rectification circuit. The judgment of the wiring state of any phase line and zero line can be realized only through the three-phase rectification circuit of the existing variable frequency air conditioner without additionally arranging a three-phase detection circuit in the power circuit of the variable frequency air conditioner, so that the power circuit of the variable frequency air conditioner is convenient to miniaturize and lighten.

In the above technical solution, the processing module is further configured to determine that the phase line where the first relay is located is reversely connected to the zero line when both the third voltage value and the fourth voltage value are smaller than the first voltage value.

In the technical scheme, the process that the processing module determines the wiring state of any one of three phase lines and a zero line in a three-phase rectification circuit of the variable frequency air conditioner comprises the following steps: the processing module determines a voltage value smaller than the first voltage value among the second voltage value, the third voltage value and the fourth voltage value.

Specifically, under the condition that the processing module judges that the third voltage value and the fourth voltage value are both smaller than the first voltage value, the processing module determines that the phase line and the zero line where the first relay is located are reversely connected.

The voltage of the double phase is reduced to

The double-phase voltage, namely the phase line where the second relay and the third relay are located does not have the condition of being reversely connected with the zero line, so that the condition that the phase line where the first relay is located has the condition of being reversely connected with the zero line can be determined。

In the technical scheme, after it is determined that one phase line and the zero line are reversely connected in the three-phase rectification circuit of the variable frequency air conditioner, the processing module can determine which specific phase line of the three phase lines is reversely connected with the zero line according to the specific size relation between the second voltage value, the third voltage value and the fourth voltage value and the first voltage value, so that the reverse connection fault can be rapidly processed in the subsequent steps.

In the above technical solution, the processing module is further configured to determine that the phase line where the second relay is located is reversely connected to the zero line when both the second voltage value and the fourth voltage value are smaller than the first voltage value.

Specifically, under the condition that the processing module judges that the second voltage value and the fourth voltage value are both smaller than the first voltage value, the processing module determines that the phase line and the zero line where the second relay is located are reversely connected.

The voltage of the double phase is reduced to

In the technical scheme, after it is determined that one phase line and the zero line are reversely connected in the three-phase rectification circuit of the inverter air conditioner, the processing module can determine which specific phase line of the three phase lines is reversely connected with the zero line according to the specific size relation between the second voltage value, the third voltage value, the fourth voltage value and the first voltage value, so that the subsequent steps can rapidly process the reverse connection fault.

In the above technical solution, the processing module is further configured to determine that the phase line where the third relay is located is reversely connected to the zero line when the second voltage value and the third voltage value are smaller than the first voltage value.

In the technical scheme, the process that the processing module determines the wiring state of any one of three phase lines and a zero line in a three-phase rectification circuit of the variable frequency air conditioner comprises the following steps: the processing module determines a voltage value that is smaller than the first voltage value among the second voltage value, the third voltage value, and the fourth voltage value.

Specifically, under the condition that the processing module judges that the second voltage value and the third voltage value are both smaller than the first voltage value, the processing module determines that the phase line and the zero line of the third relay are reversely connected.

The voltage of the double phase is reduced to

According to a third aspect of the present invention, there is provided a device for detecting reverse connection of zero lines of phase lines, the device comprising: a memory having a program or instructions stored therein; the processor executes the program or the instructions stored in the memory to implement the steps of the method for detecting the reverse connection of the phase line and the zero line provided by the technical scheme of the invention, so that the method has all the beneficial technical effects of the method for detecting the reverse connection of the phase line and the zero line provided by the technical scheme of the invention, and redundant description is not repeated herein.

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 method for detecting the reverse connection of the phase line and the zero line according to the above-mentioned technical solution of the present invention. Therefore, the readable storage medium has all the beneficial effects of the detection method for detecting the reverse connection of the phase line and the zero line provided by the technical scheme of the invention, and the description is omitted here.

According to a fifth aspect of the present invention, a variable frequency air conditioner is provided, which includes the detecting device for detecting the reverse connection of the phase line and the zero line provided by the above technical solution of the present invention, and/or the readable storage medium provided by the above technical solution of the present invention, so that the variable frequency air conditioner has all the advantages of the detecting device for detecting the reverse connection of the phase line and the zero line provided by the above technical solution of the present invention, and will not be described herein again.

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

Drawings

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

fig. 1 shows a schematic diagram of a three-phase detection circuit in the related art;

FIG. 2 is a flow chart of a method for detecting reverse connection of the phase line and the zero line according to an embodiment of the invention;

FIG. 3 is a schematic diagram of a three-phase rectification circuit of the inverter air conditioner according to the embodiment of the invention;

FIG. 4 is a second schematic flow chart of a method for detecting reverse connection of the phase line and the zero line according to the embodiment of the present invention;

FIG. 5 is a third schematic flow chart of a method for detecting reverse connection of the phase line and the zero line according to an embodiment of the present invention;

FIG. 6 is a fourth schematic flow chart illustrating a method for detecting reverse connection of the phase line and the zero line according to an embodiment of the present invention;

FIG. 7 is a fifth schematic flow chart illustrating a method for detecting reverse connection of the phase line and the zero line according to an embodiment of the present invention;

figure 8 shows one of the schematic block diagrams of the detection device for the reverse connection of the zero line of the phase line of an embodiment of the invention;

fig. 9 shows a second schematic block diagram of a detection device for detecting the reverse connection of the phase line and the zero line of the embodiment of the invention.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

The method, the device, the storage medium and the variable frequency air conditioner for detecting the reverse connection of the phase line and the zero line provided by the embodiment of the invention are described in detail by referring to fig. 1 to 9 through specific embodiments and application scenarios thereof.

The first embodiment is as follows:

fig. 2 is a schematic flow chart of a detection method for detecting reverse connection of phase lines and zero lines in an embodiment of the present invention, where the detection method is used for a three-phase rectification circuit of a variable frequency air conditioner, the three-phase rectification circuit includes a zero line, a dc bus, three phase lines, and a first relay, a second relay, and a third relay respectively located on each phase line, and the detection method includes:

step S202, under the condition that the first relay, the second relay and the third relay are all closed, a first voltage value of the direct current bus is obtained;

step S204, under the condition that any relay is disconnected, the current voltage value of the direct current bus is obtained;

and step S206, determining that one phase line is reversely connected with the zero line under the condition that the first voltage value is not equal to the current voltage value.

It should be noted that, the detecting method for the reverse connection of the phase line and the zero line provided by the present invention is mainly used for a three-phase rectification circuit of a variable frequency air conditioner, and an executing main body of the detecting method for the reverse connection of the phase line and the zero line provided by the present invention may be a detecting device for the reverse connection of the phase line and the zero line.

An exemplary three-phase rectification circuit of the inverter air conditioner is shown in fig. 3, wherein a zero line is represented by N, three phase lines are represented by L1, L2 and L3 respectively, a direct current bus is represented by L4, a first relay is represented by RY1 and is arranged on L1, a second relay is represented by RY2 and is arranged on L2, and a third relay is represented by RY3 and is arranged on L3.

In this embodiment, the three-phase rectification circuit is a basic power supply circuit of the inverter air conditioner, the phase lines are used for indicating an alternating current bus of the basic power supply circuit, and the first relay, the second relay and the third relay are respectively arranged on the three phase lines and used for controlling the disconnection and connection of the three phase lines and the three-phase rectification circuit.

Specifically, the detection device first controls the first relay, the second relay, and the third relay to be closed, and then obtains a current voltage value of the dc bus, that is, the first voltage value. Specifically, when the first relay, the second relay, and the third relay are all in the closed state, the three-phase rectification is performed regardless of whether the three-phase rectification is performedIf the condition that the phase line and the zero line are reversely connected exists in the circuit, the obtained first voltage value is equal to the phase voltage of the phase line

Multiple or equal to the phase line voltage

And (4) doubling.

Voltage of double phase is reduced to

In this embodiment, the detection device first obtains the first voltage value when the first relay, the second relay, and the third relay are all in the closed state; under the condition that any one relay is disconnected, the current voltage value is obtained; and then judging whether one phase line and the zero line are reversely connected or not according to the first voltage value and the current voltage value. In the embodiment of the invention, a three-phase detection circuit is not required to be additionally arranged in the power supply circuit of the inverter air conditioner, and the judgment of the wiring state of any phase line and zero line can be realized only by the three-phase rectification circuit of the existing inverter air conditioner, so that the power supply circuit of the inverter air conditioner is convenient to miniaturize and lighten, and the production cost of the power supply circuit of the inverter air conditioner can be reduced.

Fig. 4 is a schematic flow chart illustrating a detection method for detecting reverse connection of a phase line and a zero line in an embodiment of the present invention, where the detection method includes:

step S402, under the condition that the first relay, the second relay and the third relay are all closed, acquiring a first voltage value of the direct current bus;

step S404, acquiring the current voltage value of the direct current bus under the condition that any relay is disconnected;

step S406, determining that one phase line is reversely connected with the zero line under the condition that the first voltage value is not equal to the current voltage value;

step S408, acquiring a second voltage value of the direct current bus under the condition that only the first relay is disconnected, acquiring a third voltage value of the direct current bus under the condition that only the second relay is disconnected, and acquiring a fourth voltage value of the direct current bus under the condition that only the third relay is disconnected;

and step S410, confirming the wiring state of any phase line and the zero line according to the first voltage value, the second voltage value, the third voltage value and the fourth voltage value.

In this embodiment, after the detecting device determines that one phase line and the zero line are reversely connected, it can also determine which phase line and zero line are reversely connected, and the specific manner is as follows: the detection device only controls the first relay to be switched off, and obtains the voltage value of the direct current bus at the moment, namely the second voltage value; the detection device only controls the second relay to be switched off, and obtains the voltage value of the direct current bus at the moment, namely the third voltage value; the detection device only controls the third relay to be switched off, and obtains the voltage value of the direct current bus at the moment, namely the fourth voltage value.

The voltage of the double phase is reduced to

The voltage of the phase is doubled. Therefore, the detection device can respectively obtain the second voltage value, the third voltage value and the fourth voltage value according to the condition that the first relay, the second relay or the third relay is only disconnected, and can judge which specific phase line of the three phase lines is reversely connected with the zero line.

In this embodiment, the detection device can determine the connection state of any one of the three phase lines and the zero line by respectively obtaining the second voltage value, the third voltage value and the fourth voltage value when only the first relay, the second relay or the third relay is turned off respectively under the condition that it is determined that one phase line and the zero line are reversely connected in the three-phase rectification circuit. The judgment of the wiring state of any phase line and zero line can be realized only through the three-phase rectification circuit of the existing variable frequency air conditioner without additionally arranging a three-phase detection circuit in the power circuit of the variable frequency air conditioner, so that the power circuit of the variable frequency air conditioner is convenient to miniaturize and lighten.

Fig. 5 shows a schematic flow chart of a detection method for reverse connection of phase lines and zero lines in an embodiment of the present invention, where the detection method includes:

step S502, under the condition that the first relay, the second relay and the third relay are all closed, a first voltage value of the direct current bus is obtained;

step S504, under the condition that any relay is disconnected, the current voltage value of the direct current bus is obtained;

step S506, determining that one phase line is reversely connected with the zero line under the condition that the first voltage value is not equal to the current voltage value;

step S508, under the condition that only the first relay is disconnected, a second voltage value of the direct current bus is obtained, under the condition that only the second relay is disconnected, a third voltage value of the direct current bus is obtained, and under the condition that only the third relay is disconnected, a fourth voltage value of the direct current bus is obtained;

and step S510, under the condition that the third voltage value and the fourth voltage value are both smaller than the first voltage value, confirming that the phase line where the first relay is located is reversely connected with the zero line.

In this embodiment, the process of determining the connection state of any one of the three phase lines and the zero line in the three-phase rectification circuit of the inverter air conditioner by the detection device is as follows: the detection device determines a voltage value smaller than the first voltage value among the second voltage value, the third voltage value, and the fourth voltage value.

The voltage of the double phase is reduced to

In this embodiment, after it is determined that one phase line and the zero line are reversely connected in the three-phase rectification circuit of the inverter air conditioner, the detection device can determine which specific phase line of the three phase lines is reversely connected with the zero line according to the specific size relationship between the second voltage value, the third voltage value, the fourth voltage value and the first voltage value, so as to facilitate rapid processing of the reverse connection fault in subsequent steps.

Fig. 6 is a schematic flow chart illustrating a detection method for reverse connection of the phase line and the zero line in the embodiment of the present invention, where the detection method includes:

step S602, under the condition that the first relay, the second relay and the third relay are all closed, acquiring a first voltage value of the direct current bus;

step S604, acquiring the current voltage value of the direct current bus under the condition that any relay is disconnected;

step S606, determining that one phase line is reversely connected with the zero line under the condition that the first voltage value is not equal to the current voltage value;

step S608, acquiring a second voltage value of the direct current bus under the condition that only the first relay is disconnected, acquiring a third voltage value of the direct current bus under the condition that only the second relay is disconnected, and acquiring a fourth voltage value of the direct current bus under the condition that only the third relay is disconnected;

and step S610, under the condition that the second voltage value and the fourth voltage value are both smaller than the first voltage value, determining that the phase line where the second relay is located is reversely connected with the zero line.

The voltage of the double phase is reduced to

The phase line voltage of the second relay is equal to the phase line voltage of the first relay, namely, the phase line of the first relay is connected with the zero line in a reverse mode.

Fig. 7 is a schematic flow chart of a detection method for reverse connection of phase lines and zero lines in the embodiment of the present invention, where the detection method includes:

step S702, under the condition that the first relay, the second relay and the third relay are all closed, acquiring a first voltage value of the direct current bus;

step S704, under the condition that any relay is disconnected, the current voltage value of the direct current bus is obtained;

step S706, determining that one phase line is reversely connected with a zero line under the condition that the first voltage value is not equal to the current voltage value;

step 708, acquiring a second voltage value of the direct current bus under the condition that only the first relay is switched off, acquiring a third voltage value of the direct current bus under the condition that only the second relay is switched off, and acquiring a fourth voltage value of the direct current bus under the condition that only the third relay is switched off;

and step S710, under the condition that the second voltage value and the third voltage value are smaller than the first voltage value, determining that the phase line where the third relay is located is reversely connected with the zero line.

Specifically, under the condition that the detection device judges that the second voltage value and the third voltage value are both smaller than the first voltage value, the detection device determines that the phase line and the zero line of the third relay are reversely connected.

The voltage of the double phase is reduced to

The voltage of the double phase, namely the phase line where the first relay and the second relay are located, is not reversely connected with the zero line, so that the situation that the voltage of the double phase is opposite to the zero line can be determinedAnd the phase line of the third relay is reversely connected with the zero line.

Example two:

fig. 8 is a schematic block diagram of a detection apparatus for phase line and zero line reverse connection according to an embodiment of the present invention, where the detection apparatus 800 for phase line and zero line reverse connection is used in a three-phase rectification circuit of a variable frequency air conditioner, the three-phase rectification circuit includes a zero line, a dc bus, three phase lines, and a first relay, a second relay, and a third relay respectively located on each phase line, and the detection apparatus includes: an obtaining module 802, configured to obtain a first voltage value of the dc bus when the first relay, the second relay, and the third relay are all closed; the obtaining module 802 is further configured to obtain a current voltage value of the dc bus when any relay is turned off; and the processing module 804 is configured to determine that one of the phase lines is reversely connected with the zero line when the first voltage value is not equal to the current voltage value.

Specifically, the obtaining module 802 first obtains the current voltage value of the dc bus, that is, the first voltage value, when the first relay, the second relay, and the third relay are all closed. Specifically, when the first relay, the second relay, and the third relay are all in the closed state, the first voltage value obtained is equal to the phase current of the phase line regardless of whether the phase line and the zero line are reversely connected in the three-phase rectification circuit or notBy pressing

Multiple or equal to the phase line voltage

And (4) doubling.

Further, the obtaining module 802 obtains the current voltage value of the dc bus when any of the relays is turned off, that is, the voltage value of the dc bus when only the first relay is controlled to be turned off, only the second relay is controlled to be turned off, or only the third relay is controlled to be turned off is obtained.

The voltage of the double phase is reduced to

The voltage of the phase is doubled. Therefore, the obtaining module 802 needs to obtain the current voltage value of the dc bus when any relay is turned off, so that the processing module 804 in the subsequent step determines whether any phase line and zero line are reversely connected in the three-phase rectification circuit according to the current voltage value.

It should be noted that a voltage sensor is disposed on the dc bus, and the obtaining module 802 may obtain the first voltage value and the current voltage value through the voltage sensor.

Further, the processing module 804 determines the connection state of any one of the three phase lines and the zero line according to the first voltage value and the current voltage value, that is, determines whether one of the three phase lines and the zero line are reversely connected. Specifically, in the case where the first voltage value and the current voltage value are not equal, it is determined that there is a case where one phase line is reversely connected to the zero line.

In particular, the processing module 804 can be implemented on any phase lineWhether the current voltage value of the direct current bus is reduced to the value when the relay is disconnected

In this embodiment, the obtaining module 802 first obtains the first voltage value when the first relay, the second relay, and the third relay are all in a closed state; under the condition that any one relay is disconnected, the current voltage value is obtained; the processing module 804 determines whether one of the three phase lines is reversely connected to the zero line according to the first voltage value and the current voltage value. In the embodiment of the invention, a three-phase detection circuit is not required to be additionally arranged in the power supply circuit of the inverter air conditioner, and the judgment of the wiring state of any phase line and zero line can be realized only by the three-phase rectification circuit of the existing inverter air conditioner, so that the power supply circuit of the inverter air conditioner is convenient to miniaturize and lighten, and the production cost of the power supply circuit of the inverter air conditioner can be reduced.

In addition, the detecting device 800 for detecting the reverse connection of the phase line and the zero line, which is proposed according to the above-mentioned embodiment of the present invention, may further have the following additional technical features:

in the above embodiment, the obtaining module 802 is further configured to obtain the second voltage value of the dc bus when only the first relay is turned off, obtain the third voltage value of the dc bus when only the second relay is turned off, and obtain the fourth voltage value of the dc bus when only the third relay is turned off; the processing module 804 is further configured to determine a wiring state of any one of the phase line and the zero line according to the first voltage value, the second voltage value, the third voltage value, and the fourth voltage value.

In this embodiment, after the processing device determines that one phase line and the zero line are reversely connected, it may further determine which phase line and the zero line are specifically reversely connected, and the specific manner is as follows: firstly, when only the first relay is turned off, the second voltage value of the direct current bus is obtained through the obtaining module 802; when only the second relay is switched off, acquiring a third voltage value of the direct current bus; and when only the third relay is switched off, acquiring a fourth voltage value of the direct current bus.

Further, the processing module 804 determines the connection state of any one of the three phase lines and the zero line according to the first voltage value, the second voltage value, the third voltage value, and the fourth voltage value, that is, determines which specific phase line and zero line of the three phase lines are in reverse connection.

The voltage of the double phase is reduced to

The voltage of the phase is doubled. Therefore, the processing module 804 may respectively obtain the second voltage value, the third voltage value, and the fourth voltage value according to the obtaining module 802 when only the first relay, the second relay, or the third relay is respectively turned off, and determine which specific phase line of the three phase lines is reversely connected to the zero line.

In this embodiment, the processing module 804 can determine the connection state of any one of the three phase lines and the zero line by respectively obtaining the second voltage value, the third voltage value and the fourth voltage value when only the first relay, the second relay or the third relay is turned off respectively under the condition that it is determined that one phase line and the zero line are reversely connected in the three-phase rectification circuit. The judgment of the wiring state of any phase line and zero line can be realized only through the three-phase rectification circuit of the existing variable frequency air conditioner without additionally arranging a three-phase detection circuit in the power circuit of the variable frequency air conditioner, so that the power circuit of the variable frequency air conditioner is convenient to miniaturize and lighten.

In the above embodiment, the processing module 804 is further configured to confirm that the phase line where the first relay is located is reversely connected to the zero line when both the third voltage value and the fourth voltage value are smaller than the first voltage value.

In this embodiment, the process that the processing module 804 determines the connection state of any one of the three phase lines and the zero line in the three-phase rectification circuit of the inverter air conditioner is as follows: the processing module 804 determines a voltage value smaller than the first voltage value among the second voltage value, the third voltage value, and the fourth voltage value.

Specifically, when the processing module 804 determines that the third voltage value and the fourth voltage value are both smaller than the first voltage value, the processing module 804 determines that the phase line and the zero line where the first relay is located are reversely connected.

The voltage of the double phase is reduced to

The phase line voltage of the second relay and the phase line of the third relay are not in reverse connection with the zero line, so that the condition that the phase line of the first relay is in reverse connection with the zero line can be determined.

In this embodiment, after it is determined that one phase line and the zero line are reversely connected in the three-phase rectification circuit of the inverter air conditioner, the processing module 804 can determine which specific phase line of the three phase lines is reversely connected to the zero line according to the specific size relationship between the second voltage value, the third voltage value, the fourth voltage value and the first voltage value, so as to facilitate rapid processing of the reverse connection fault in subsequent steps.

In the above embodiment, the processing module 804 is further configured to confirm that the phase line where the second relay is located is reversely connected to the zero line when both the second voltage value and the fourth voltage value are smaller than the first voltage value.

Specifically, when the processing module 804 determines that the second voltage value and the fourth voltage value are both smaller than the first voltage value, the processing module 804 determines that the phase line and the zero line of the second relay are reversely connected.

The voltage of the double phase is reduced to

In this embodiment, after it is determined that one phase line and the zero line of the three-phase rectification circuit of the inverter air conditioner are reversely connected, the processing module 804 can determine which specific phase line of the three phase lines is reversely connected with the zero line according to the specific size relationship between the second voltage value, the third voltage value, the fourth voltage value and the first voltage value, so as to facilitate rapid processing of the reverse connection fault in subsequent steps.

In the above embodiment, the processing module 804 is further configured to confirm that the phase line where the third relay is located is reversely connected to the zero line when the second voltage value and the third voltage value are smaller than the first voltage value.

In this embodiment, the process that the processing module 804 determines the connection state of any one of the three phase lines and the zero line in the three-phase rectification circuit of the inverter air conditioner is as follows: the processing module 804 determines the second voltage value, the third voltage value, and the fourth voltage value to be less than the first voltage value.

Specifically, when the processing module 804 determines that the second voltage value and the third voltage value are both smaller than the first voltage value, the processing module 804 determines that the phase line and the zero line of the third relay are reversely connected.

The voltage of the double phase is reduced to

Example three:

fig. 9 is a schematic block diagram of a detecting device for detecting reverse connection of phase and zero lines according to an embodiment of the present invention, wherein the detecting device 900 for reverse connection of phase and zero lines comprises: a memory 902, the memory 902 having programs or instructions stored therein; the processor 904 and the processor 904 execute the program or the instructions stored in the memory 902 to implement the steps of the method for detecting the reverse connection of the phase line and the zero line according to the above-mentioned embodiment of the present invention, so that all the beneficial technical effects of the method for detecting the reverse connection of the phase line and the zero line according to the above-mentioned embodiment of the present invention are achieved, and redundant description is not repeated herein.

Example four:

according to a fourth embodiment of the invention, a readable storage medium is proposed, on which a program or instructions are stored, which when executed by a processor implement the method for detecting the reversal of the phase zero line as proposed in the above-mentioned embodiments of the invention. Therefore, the readable storage medium has all the beneficial effects of the method for detecting the reverse connection of the phase line and the zero line provided by the above embodiment of the present invention, and details are not described herein again.

Example five:

according to a fifth embodiment of the present invention, a variable frequency air conditioner is provided, which includes the detecting device for detecting the reverse connection of the phase line and the zero line provided in the above-mentioned embodiment of the present invention, and/or the readable storage medium provided in the above-mentioned embodiment of the present invention, so that the variable frequency air conditioner has all the advantages of the detecting device for detecting the reverse connection of the phase line and the zero line provided in the above-mentioned embodiment of the present invention and/or the readable storage medium provided in the above-mentioned embodiment of the present invention, and no further description is provided herein.

In the description herein, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly stated or limited otherwise; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

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

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a detection method of phase line zero line transposition which characterized in that, the three-phase rectifier circuit that is used for inverter air conditioner, three phase rectifier circuit include zero line, direct current bus, three phase lines and be located respectively every first relay, second relay and the third relay on the phase line, detection method includes:

under the condition that the first relay, the second relay and the third relay are all closed, acquiring a first voltage value of the direct current bus;

under the condition that any relay is disconnected, the current voltage value of the direct current bus is obtained;

and determining that one phase line is reversely connected with the zero line under the condition that the first voltage value is not equal to the current voltage value.

2. The method for detecting the reverse connection of the phase line and the zero line according to claim 1, further comprising, after determining that one of the phase line and the zero line is reverse connected:

acquiring a second voltage value of the direct current bus under the condition that only the first relay is turned off, acquiring a third voltage value of the direct current bus under the condition that only the second relay is turned off, and acquiring a fourth voltage value of the direct current bus under the condition that only the third relay is turned off;

and confirming the wiring state of any phase line and the zero line according to the first voltage value, the second voltage value, the third voltage value and the fourth voltage value.

3. The method according to claim 2, wherein the step of determining the connection state of any one 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 specifically comprises:

and under the condition that the third voltage value and the fourth voltage value are both smaller than the first voltage value, confirming that the phase line where the first relay is located is reversely connected with the zero line.

4. The method according to claim 2, wherein the step of determining the connection state of any one 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 specifically comprises:

and under the condition that the second voltage value and the fourth voltage value are both smaller than the first voltage value, confirming that the phase line where the second relay is located is reversely connected with the zero line.

5. The method according to claim 2, wherein the step of determining the connection state of any one 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 specifically comprises:

and under the condition that the second voltage value and the third voltage value are smaller than the first voltage value, confirming that the phase line where the third relay is located is reversely connected with a zero line.

6. The utility model provides a detection apparatus of phase line zero line transposition, a serial communication port for inverter air conditioner's three-phase rectifier circuit, three-phase rectifier circuit include zero line, direct current bus, three phase lines and be located every respectively first relay, second relay and third relay on the phase line, detection apparatus includes:

the acquisition module is used for acquiring a first voltage value of the direct current bus under the condition that the first relay, the second relay and the third relay are all closed;

the acquisition module is further used for acquiring the current voltage value of the direct current bus under the condition that any relay is disconnected;

and the processing module is used for determining that one phase line is reversely connected with the zero line under the condition that the first voltage value is not equal to the current voltage value.

7. The apparatus according to claim 6, wherein the obtaining module is further configured to obtain a second voltage value of the dc bus when only the first relay is turned off, obtain a third voltage value of the dc bus when only the second relay is turned off, and obtain a fourth voltage value of the dc bus when only the third relay is turned off;

the processing module is further configured to determine a wiring state of any one of the phase line and the zero line according to the first voltage value, the second voltage value, the third voltage value, and the fourth voltage value.

8. The apparatus according to claim 7, wherein the processing module is further configured to determine that the phase line on which the first relay is located is reversely connected to the neutral line when the third voltage value and the fourth voltage value are both smaller than the first voltage value.

9. The apparatus according to claim 7, wherein the processing module is further configured to determine that the phase line of the second relay is reversely connected to the neutral line when the second voltage value and the fourth voltage value are both smaller than the first voltage value.

10. The apparatus according to claim 7, wherein the processing module is further configured to confirm that the phase line and the neutral line of the third relay are reversely connected when the second voltage value and the third voltage value are smaller than the first voltage value.

11. The utility model provides a detection apparatus of phase line zero line transposition which characterized in that includes:

memory storing a program and a processor implementing the steps of the method for detecting a phase-neutral reversal according to any one of claims 1 to 5 when the program is executed.

12. A readable storage medium, characterized in that it stores a program or instructions which, when executed by a processor, implement the steps of the method for detecting the reversal of the phase zero line according to any one of claims 1 to 5.

13. The utility model provides a variable frequency air conditioner which characterized in that includes:

a device for detecting the reversal of the neutral line of the phase according to any one of claims 6 to 11; and/or

The readable storage medium of claim 12.