JP7263541B2 - AIR CONDITIONER, DETECTION DEVICE FOR AIR CONDITIONER AND METHOD FOR DETECTING FAILURE OF DRIVE CIRCUIT - Google Patents

Description

This application is filed based on a Chinese patent application with application number "201910227242.7" and filed on March 25, 2019, and claims priority from said Chinese patent application. The entire contents of the patent application are incorporated herein by reference.

TECHNICAL FIELD The present application relates to the field of air conditioner technology, and more particularly to an air conditioner, a detection device for an air conditioner, and a method for detecting faults in a drive circuit.

In the field of air conditioner technology, there is a problem that if the compressor or the drive circuit of the electric control panel that drives the compressor outside the room fails, the compressor will not operate. In this case, it is necessary to investigate whether the problem is with the compressor or the drive circuit of the electric control board.

Since the drive circuit of the electric control panel is complicated and specialized, it is difficult for the serviceman to determine on the spot which part of the drive circuit of the electric control panel has a problem. method is the only way to solve this problem. Replace the electrical control board first, then start up and test again. If it works normally, it means that there is a problem with the drive circuit of the electric control board, which can be solved by replacing the electric control board. On the other hand, if the compressor does not operate normally even after replacing the electrical control panel, it indicates that there is a problem with the compressor, and it can be resolved by replacing the compressor. However, this detection method cannot quickly identify the failure point, has low detection efficiency, and can only detect the problem by replacing the device.

The present application aims to solve at least to some extent one of the technical problems in the related art.

Therefore, a first object of the present application is to provide an air conditioner in which a failure point can be identified simply, quickly, and efficiently without replacing the device, and maintenance can be facilitated.

A second object of the present application is to provide a control system for a heating device.

A third object of the present application is to provide a method for detecting a fault in a drive circuit.

A fourth object of the present application is to provide another drive circuit fault detection method.

To achieve the above object, an embodiment of the first aspect of the present application includes a compressor, six switch elements, a drive circuit for driving the compressor, and a detection device for an air conditioner comprising the drive circuit The six switch elements corresponding to the six PWM drive signals are detected so as to detect the voltage between the output terminals of any two phases of and recognize whether the drive circuit is out of order based on the voltage. and a controller for continuously outputting to the air conditioner.

According to the air conditioner according to the embodiment of the present application, the detection device of the air conditioner detects the voltage between the output terminals of any two phases of the drive circuit, and detects the failure of the drive circuit based on the voltage. The controller of the air conditioner continuously outputs 6 PWM drive signals to the corresponding 6 switch elements so that the failure point can be easily and quickly detected without replacing the device. , and can be efficiently identified to facilitate maintenance.

Moreover, the air conditioner according to the above embodiment of the present application may further have the following additional technical features.

According to an embodiment of the present application, specifically, after detecting that the air conditioner enters the inspection mode, the controller continuously outputs the six PWM drive signals to the corresponding six switch elements. output to

According to an embodiment of the present application, the controller further detects the current of the compressor after receiving the command to enter the forced cooling mode sent by the indoor unit, and based on the current, the compressor When it is recognized that it is not connected to the drive circuit, it controls the air conditioner to enter the inspection mode.

To achieve the above object, an embodiment of the second aspect of the present application provides an air conditioner detection device applied to an air conditioner according to an embodiment of the first aspect, wherein the detection device comprises: A detection module for detecting a voltage between arbitrary two-phase output terminals of a drive circuit of an air conditioner; and a recognition module for recognizing whether or not the drive circuit is faulty based on the voltage. ,including.

In the detection device for an air conditioner according to the embodiments of the present application, the detection module detects the voltage between arbitrary two-phase output terminals of the drive circuit of the air conditioner, and the recognition module detects the voltage between the drive circuit based on the voltage. By recognizing whether a device has failed, the point of failure can be easily, quickly, and efficiently located without replacing the device, facilitating maintenance.

In addition, the air conditioner detection device according to the above embodiment of the present application may further have the following additional technical features.

According to an embodiment of the present application, the recognition module specifically determines that the driving circuit is faulty when the voltage is recognized to be outside a set voltage range.

To achieve the above object, an embodiment of the third aspect of the present application provides a method for detecting failure of a drive circuit performed by an air conditioner, wherein the detection method comprises: 6 switch elements corresponding to 6 PWM drive signals so as to detect the voltage between the output terminals of any two phases of the circuit and recognize whether the drive circuit is faulty based on the voltage; , including the step of continuously outputting to

According to the drive circuit failure detection method according to the embodiments of the present application, the detection device of the air conditioner detects the voltage between the output terminals of any two phases of the drive circuit, and the drive circuit is operated based on the voltage. Continuously output six PWM drive signals to the corresponding six switch elements so as to recognize whether the circuit is faulty or not. Thereby, the method can easily, quickly and efficiently identify the point of failure without replacing the device to facilitate maintenance.

In addition, the drive circuit failure detection method according to the above embodiments of the present application may further have the following additional technical features.

According to an embodiment of the present application, the method for detecting failure of the drive circuit continuously applies six PWM drive signals to six corresponding switch elements after detecting that the air conditioner has entered the inspection mode. further comprising performing the step of outputting to .

According to an embodiment of the present application, detecting the current of the compressor after receiving the command to enter the forced cooling mode sent by the indoor unit, and based on the current, the compressor is connected to the driving circuit. When it is recognized that there is no such condition, the air conditioner is controlled to enter the inspection mode.

To achieve the above object, an embodiment of the fourth aspect of the present application provides another drive circuit failure detection method performed by a detection device for an air conditioner, the detection method comprising: detecting a voltage across any two phase output terminals of a machine drive circuit; and based on said voltage, recognizing whether said drive circuit is faulty.

According to the method for detecting a failure of a drive circuit according to an embodiment of the present application, a voltage between arbitrary two-phase output terminals of the drive circuit of the air conditioner is detected, and the failure of the drive circuit is detected based on the voltage. recognize whether or not Thereby, the method can easily, quickly and efficiently identify the point of failure without replacing the device to facilitate maintenance.

In addition, the drive circuit failure detection method according to the above embodiments of the present application may further have the following additional technical features.

According to an embodiment of the present application, the step of recognizing whether the drive circuit is faulty based on the voltage includes: if the voltage is determined to be outside a set voltage range, the Determining that the drive circuit has failed.

1 is a schematic block diagram of an air conditioner according to an embodiment of the present application; FIG. 1 is a circuit diagram of a compressor drive circuit in an air conditioner according to an embodiment of the present application; FIG. FIG. 4 is a voltage waveform diagram formed at U, V, and W interfaces during normal operation of a driving circuit according to an embodiment of the present application; FIG. 4 is a voltage vector diagram of a compressor according to an embodiment of the present application; 1 is a schematic block diagram of a detection device for an air conditioner according to an embodiment of the present application; FIG. 4 is a flow chart of a method for detecting a fault in a drive circuit according to an embodiment of the present application; FIG. 4 is a flow chart of another method for detecting a fault in a drive circuit according to another embodiment of the present application; FIG.

Hereinafter, embodiments of the present application will be described in detail, examples of which are illustrated in the drawings, and the same or similar reference numerals throughout denote the same or similar elements or elements having the same or similar functions. . The embodiments described below with reference to the drawings are illustrative and are intended to interpret the present application, but should not be understood as limiting the present application.

Hereinafter, an air conditioner, an air conditioner detection device, and a method of detecting failure of a drive circuit according to an embodiment of the present application will be described with reference to the drawings.

FIG. 1 is a schematic block diagram of an air conditioner according to one embodiment of the present application, and FIG. 2 is a circuit diagram of a compressor drive circuit in the air conditioner according to one embodiment of the present application.

1 and 2, the air conditioner according to the embodiment of the present application includes a compressor 10, a drive circuit 20 and a controller 30. FIG.

Here, the drive circuit 20 includes six switch elements, the drive circuit 20 drives the compressor 10, and the controller 30 controls the detection device (not shown) of the air conditioner to output any two phases of the drive circuit. The voltage between the terminals is detected, and based on the voltage, the six PWM drive signals are continuously output to the corresponding six switch elements so as to recognize whether or not the drive circuit 20 is out of order.

In the embodiment of the present application, as shown in FIG. 2, the drive circuit 20 of the electric control board of the compressor 10 of the air conditioner is composed of six switch elements, for example, six IGBTs (Insulated Gate Bipolar Transistors). This drive circuit 20 drives the compressor 10, where S1-S6 represent the six switch element IGBTs, and the six IGBTs S1-S6 are the controller 10 (not shown in FIG. 2). ). Specifically, when the electrical control panel is normal, the controller 10 can output PWM signals to control the six switch elements, at this time, the three input U, V, W interfaces of the compressor 10 are , a voltage waveform is formed as shown in FIG. 3, where Vu represents the voltage of phase U with respect to neutral, Vv represents the voltage of phase V with respect to neutral, and Vw represents the voltage of the W phase with respect to the neutral wire, Vu-v represents the voltage between the two phases of UV, Vv-w represents the voltage between the two phases of VW, and Vw-u represents the voltage of WU It represents the voltage between two phases. On the other hand, if the electric control panel is damaged, the controller 10 cannot drive the compressor 10. In this case, the reason for the electric control panel damage is that the 6 PWM drive signals output from the controller 30 are abnormal. Or, it may be that at least one of the six switch elements is out of order, so by measuring the voltage between U, V, and W, the It can be determined whether a failure will occur.

Therefore, the controller 30 detects the voltage between the output terminals of any two phases of the drive circuit 20 by the detection device of the air conditioner, and recognizes whether the drive circuit 20 is out of order based on the voltage. , continuously output six PWM drive signals to corresponding six switch elements.

In addition, in the normal operation mode, if the electric control board or the compressor 10 is faulty, the electric control board will stop outputting the six PWM drive signals after detecting the fault, in this case, the six switch elements is not turned on, the voltage between U, V and W is zero.

Specifically, to facilitate the measurement, the controller 30 continuously outputs 6 PWM drive signals to the corresponding 6 switch elements so that the voltages between U, V, and W can be kept stable. Therefore, it is necessary to set the inspection mode. In this mode, the controller 30 only continuously outputs the six PWM drive signals to the corresponding six switch elements without detecting compressor feedback signals and determining compressor failure.

Next, the detection device of the air conditioner detects the voltage between the output terminals of any two phases of the drive circuit 20, for example, using the AC voltage file of the multimeter, the UV of the electric control panel, Measure the voltages across the VW and WU wire terminals, respectively, and determine the corresponding voltages Vu-v, Vv-w, and Vw-u across the UV, VW, and WU wire terminals, respectively. After obtaining , determine each voltage, and if Vu-v, Vv-w, and Vw-u are all in the range of 150 to 270 V, there are outputs in the six IGBTs, and the drive circuit 20 of the electrical control board If only one of Vu-v, Vv-w, and Vw-u is not between 150 and 270V, indicating no fault, then there is a fault in the electrical control board drive circuit 20 and the electrical control board should be replaced. indicates that you must

If the drive circuit 20 of the electric control panel is normal, it can be determined that the compressor 10 is out of order, and the compressor 10 needs to be replaced immediately.

Specifically, according to an embodiment of the present application, the controller 30 continuously outputs 6 PWM drive signals to the corresponding 6 switch elements after detecting that the air conditioner has entered the inspection mode. .

According to one embodiment of the present application, the controller 30 further detects the current of the compressor after receiving the command to enter the forced cooling mode sent by the indoor unit, and based on the current, the compressor 10 controls the driving circuit. 20, it controls the air conditioner to enter the inspection mode.

Preferably, a transition method is specifically set up to facilitate the transition to the inspection mode described above. First, after turning off the power, unplug the connection line of the outdoor compressor 10, and then turn on the power again, and send a command to enter the forced cooling mode through the forced button on the main control panel of the indoor unit. Control the air conditioner to start the forced cooling function. After the outdoor unit receives the command to enter the forced cooling mode sent from the indoor unit, the controller 30 on the electric control panel of the outdoor unit detects the current of the compressor 10, and based on this current, the compressor drives the drive circuit. 20, for example, if the current is less than a preset current threshold, determine that the compressor 10 is not connected to the drive circuit 20, in this case, the air conditioner considered to be in inspection mode.

After the air conditioner enters the inspection mode, the controller 30 of the electric control panel of the outdoor unit executes the corresponding program, the driving control method of the compressor 10 adopts the speed open loop and current closed loop method, and the compressor does not detect the feedback signal, does not judge the failure of the compressor, and constantly and continuously outputs the six PWM drive signals to the corresponding six switch elements.

Finally, the detection device of the air conditioner detects voltages between the UV, VW, and WU wiring terminals of the drive circuit 20, determines each voltage, and determines UV, VW, and When the voltages Vu-v, Vv-w, and Vw-u between the W-U wiring terminals are all in the range of 150 to 270 V, there is an output in the six switch elements, and there is no failure in the drive circuit of the electric control panel. If only one of Vu-v, Vv-w, and Vw-u is not between 150 and 270 V, there is a failure in the electrical control board drive circuit 20 and the electrical control board needs to be replaced. represents something. On the other hand, if the electrical control panel is normal, it can be determined that the compressor 10 is out of order, and the compressor 10 needs to be replaced immediately.

According to the air conditioner according to the embodiment of the present application, the detection device of the air conditioner detects the voltage between the output terminals of any two phases of the drive circuit, and determines whether the drive circuit is out of order based on the voltage. By continuously outputting 6 PWM drive signals to the corresponding 6 switch elements by the air conditioner controller so as to recognize the can be specifically identified to facilitate maintenance.

FIG. 5 is a schematic block diagram of an air conditioner detection device according to an embodiment of the present application. As shown in FIG. 5 , the air conditioner detection apparatus according to an embodiment of the present application includes a detection module 110 and a recognition module 120 .

Here, the detection module 110 detects the voltage between any two phase output terminals of the drive circuit of the air conditioner, and the recognition module 120 recognizes whether the drive circuit is out of order based on the voltage. do.

According to one embodiment of the present application, the recognition module 120 specifically determines that the drive circuit is faulty when it recognizes that the voltage is outside the set voltage range.

For details not disclosed in the detection device of the air conditioner according to the embodiments of the present application, please refer to the details disclosed in the air conditioner according to the embodiments of the present application, and will not be described in detail here.

According to the air conditioner detection device according to the embodiment of the present application, the detection module detects the voltage between the output terminals of any two phases of the drive circuit of the air conditioner, so that the recognition module, based on the voltage, By recognizing whether the drive circuit is failing, the point of failure can be easily, quickly and efficiently located without replacing the device to facilitate maintenance.

FIG. 6 is a flow chart of a method for detecting a drive circuit failure according to one embodiment of the present application.

It should be noted that the air conditioner is the subject of execution of this drive circuit failure detection method.

As shown in FIG. 6, the drive circuit failure detection method of the embodiment of the present application includes the following steps.

In S61, the detection device of the air conditioner detects the voltage between the output terminals of any two phases of the drive circuit, and recognizes whether the drive circuit is out of order based on the voltage. PWM drive signals are continuously output to the corresponding six switch elements.

According to an embodiment of the present application, the method for detecting failure of the drive circuit continuously applies six PWM drive signals to six corresponding switch elements after detecting that the air conditioner has entered the inspection mode. Further including the step of performing the step of outputting.

According to an embodiment of the present application, the method for detecting failure of the drive circuit includes the steps of: detecting the current of the compressor after receiving a command to enter the forced cooling mode sent by the indoor unit; and controlling the air conditioner to enter the inspection mode when it is recognized that the compressor is not connected to the drive circuit.

For details that are not disclosed in the drive circuit failure detection method according to the embodiment of the present application, please refer to the details disclosed in the air conditioner according to the embodiment of the present application, and will be described in detail here. do not.

According to the drive circuit failure detection method according to the embodiments of the present application, the detection device of the air conditioner detects the voltage between the output terminals of any two phases of the drive circuit, and detects the failure of the drive circuit based on the voltage. 6 PWM drive signals are continuously output to the corresponding 6 switch elements so as to recognize whether or not they are. Thereby, the method can easily, quickly and efficiently identify the point of failure without replacing the device to facilitate maintenance.

FIG. 7 is a flow chart of a drive circuit failure detection method according to another embodiment of the present application.

It should be noted that the detection device of the air conditioner is the subject of execution of the detection method of the failure of the drive circuit.

As shown in FIG. 7, a method for detecting a fault in a driving circuit according to an embodiment of the present application includes the following steps.

In S71, the voltage between arbitrary two-phase output terminals of the drive circuit of the air conditioner is detected.

In S72, based on the voltage, it is recognized whether or not the drive circuit is out of order.

According to one embodiment of the present application, the step of recognizing whether the drive circuit is faulty based on the voltage includes detecting that the drive circuit is faulty if the voltage is found to be outside the set voltage range. determining that the

For details not disclosed in the drive circuit failure detection method according to the embodiments of the present application, please refer to the details disclosed in the air conditioner according to the embodiments of the present application, and will not be described in detail here.

According to the method for detecting a failure of a drive circuit according to an embodiment of the present application, a voltage between arbitrary two-phase output terminals of the drive circuit of the air conditioner is detected, and the failure of the drive circuit is detected based on the voltage. recognize whether or not Thereby, the method can easily, quickly and efficiently identify the point of failure without replacing the device to facilitate maintenance.

In the description herein, descriptions that refer to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples" refer to the implementation. It is meant that a specific feature, structure, material or property described in conjunction with examples or examples is included in at least one embodiment or example of this application. The exemplary descriptions of terms in this specification do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described may be combined in any suitable way in any one or more implementations or examples. Also, where not mutually contradictory, persons of ordinary skill in the art can combine and combine different embodiments or examples, and features of different embodiments or examples, described herein.

It should be noted that the terms "first" and "second" are merely descriptive and may indicate or imply relative importance or imply the number of technical features shown. Do not understand. Thus, features defined as "first" and "second" may be express or implied to include at least one of said features. In the description of this application, "plurality" means at least two, eg, two, three, etc., unless expressly specified otherwise.

Any process or method described in a flow chart or otherwise herein may be represented as a module, segment or single module containing one or more executable code of instructions for implementing a particular logic function or process step. It may be understood to indicate a part. It will also be appreciated by those skilled in the art that the scope of the preferred embodiments of the present invention is to perform the functions substantially concurrently or in reverse order, depending on such functions, rather than the order shown or discussed herein. It should be understood that other implementations can be included.

The logic and/or steps illustrated in flowcharts or otherwise described herein can be viewed, for example, as a sorted list of executable instructions for implementing the logic function, and any computer readable embodied in a possible storage medium to retrieve instructions from an instruction execution system, apparatus, or device (e.g., a computer-based system, a system that includes a processor, or an instruction execution system, apparatus, or device) to execute the instructions. system) or in combination with any of these instruction execution systems, apparatus or devices. As used herein, "computer-readable storage medium" includes programs for use by or in combination with instruction execution systems, apparatus or devices for storing, communicating, It may be any device capable of propagating or transmitting. More specific examples (non-exhaustive list) of computer readable storage media include electrical connections with one or more wires (electronic devices), portable computer disk cartridges (magnetic devices), random access memories ( RAM), read only memory (ROM), erasable programmable read only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read only memory (CDROM). The computer-readable storage medium may also be paper or other suitable medium on which the program may be printed, for example by optically scanning the paper or other medium and then editing and interpreting it. , or processed in any other suitable form as required to electronically obtain and store the program in computer memory.

It should be noted that each part of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, steps or methods may be implemented by software or firmware stored in memory and executed by a suitable instruction execution system. For example, when implemented in hardware, discrete logic circuits comprising logic gate circuits for implementing logic functions on data signals in the field, suitable combinatorial logic gate circuits, as well as other embodiments. It can be implemented by any one or a combination of techniques well known in the art such as application specific integrated circuits, programmable gate arrays (PGA), field programmable gate arrays (FPGA).

A person skilled in the art can understand that all or part of the steps included in the methods according to the above embodiments can be executed by instructing hardware by a program. The program can be stored on a computer readable storage medium and includes one or a combination of the steps in the method embodiments when the program is executed.

Also, each functional unit in each embodiment of the present invention may be integrated into one processing module, each may be a separate physical entity, or two or more units may be combined into one module. may be integrated. The integrated module may be implemented in the form of hardware, or may be implemented in the form of a software function module. When the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may be stored in a single computer-readable storage medium.

The storage medium may be a read-only memory, a magnetic disk, an optical disk, or the like. Although the embodiments of the present application have been shown and described above, the above embodiments are illustrative and should not be construed as limiting the present invention. It should be understood that changes, modifications, substitutions and variations can be made to the examples.

Claims (6)

a compressor;
a drive circuit for driving the compressor, including six switch elements;
An air conditioner comprising a controller,
The controller detects the current of the compressor after receiving the command to enter the forced cooling mode sent by the indoor unit, and based on the detected current, the compressor is not connected to the driving circuit. When recognizing that, the air conditioner is controlled to enter the inspection mode, and in the inspection mode, the detection device of the air conditioner detects the voltage between the output terminals of any two phases of the drive circuit, Continuously outputting six PWM drive signals to the corresponding six switch elements so as to recognize whether the drive circuit has failed based on the voltage ;
An air conditioner characterized by : An air conditioner detection device applied to the air conditioner according to claim 1 ,
A detection module for detecting a voltage between arbitrary two-phase output terminals of a drive circuit of the air conditioner when the air conditioner enters an inspection mode under a predetermined condition , wherein the predetermined condition and wherein the controller of the air conditioner detects the current of the compressor of the air conditioner after receiving the command to enter the forced cooling mode sent by the indoor unit, and based on the detected current, the compressor is not connected to the drive circuit, a detection module ;
a recognition module for recognizing whether the drive circuit is faulty based on the voltage;
A detection device for an air conditioner, characterized by: The recognition module is
determining that the drive circuit is faulty if the voltage is found to be outside a set voltage range;
The detection device for an air conditioner according to claim 2 , characterized in that: A method for detecting a failure of a drive circuit performed by an air conditioner comprising a compressor and a drive circuit, comprising:
detecting the current of the compressor after receiving the command to enter the forced cooling mode sent by the indoor unit, and recognizing that the compressor is not connected to the driving circuit based on the detected current; , controlling the air conditioner to enter an inspection mode;
In the inspection mode, the detection device of the air conditioner detects the voltage between the output terminals of any two phases of the drive circuit, and recognizes whether the drive circuit is out of order based on the voltage. , continuously outputting the six PWM drive signals to the corresponding six switch elements;
A method for detecting a failure of a drive circuit, characterized by: A drive circuit failure detection method performed by the air conditioner detection device according to claim 2 ,
A step of detecting a voltage between arbitrary two-phase output terminals of a drive circuit of the air conditioner when the air conditioner enters the inspection mode under a predetermined condition , wherein the predetermined condition is the After the controller of the air conditioner receives the command to enter the forced cooling mode sent by the indoor unit, detects the current of the compressor of the air conditioner, and based on the detected current, the compressor is driven to the a step of recognizing that it is not connected to the circuit ;
and recognizing whether the drive circuit is faulty based on the voltage.
A method for detecting a failure of a drive circuit, characterized by: The step of recognizing whether the drive circuit is faulty based on the voltage includes:
determining that the drive circuit has failed if the voltage is found to be outside a set voltage range;
6. The method for detecting failure of a driving circuit according to claim 5 , wherein:

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