CN114777297A

CN114777297A - Method and device for detecting fault of air conditioner variable frequency inversion module and air conditioner

Info

Publication number: CN114777297A
Application number: CN202210190738.3A
Authority: CN
Inventors: 丛安平; 邵海柱; 耿焱; 时斌; 刘春丽; 张波; 贾新旭; 胡象辉; 于飞
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-07-22

Abstract

The application relates to the technical field of intelligent household appliances, and discloses a method for detecting faults of an air conditioner variable frequency inversion module, wherein the air conditioner variable frequency inversion module comprises an upper bridge circuit and a lower bridge circuit which are formed by a plurality of switching tubes; the number of bridge arms of the bridge circuit is matched with the number of phases of alternating current output by the variable-frequency inversion module; the method comprises the following steps: under the condition that the wiring of the air conditioner compressor is disconnected, the trigger signals of the switch tubes in the upper bridge circuit and the lower bridge circuit are controlled according to a preset sequence, so that the switch tubes have conduction conditions; detecting the current of a bridge arm where the switched-on switching tube is located; and judging whether the frequency conversion inversion module has a fault or not according to the detected current and the current threshold. The method controls the conduction of the switching tubes of each bridge arm in the upper bridge circuit and the lower bridge circuit according to a preset sequence, and detects the current of the bridge arm where the switching tube is located. Through the magnitude of the current, whether the fault occurs can be accurately judged, and the misjudgment rate is reduced. The application also discloses a device for detecting the fault of the air conditioner frequency conversion inversion module, an air conditioner and a storage medium.

Description

Method and device for detecting fault of air conditioner variable frequency inversion module and air conditioner

Technical Field

The application relates to the technical field of intelligent household appliances, in particular to a method and a device for detecting faults of a frequency conversion inversion module of an air conditioner, the air conditioner and a storage medium.

Background

At present, in the use process of an air conditioner, if a compressor or a frequency converter in an outdoor unit fails, the outdoor unit cannot operate. In this case, the failure point is generally confirmed by replacing the compressor or the inverter.

In the related art, a fault protection method is disclosed, which comprises a protection circuit, wherein the protection circuit comprises a fault detection module, the input end of the fault detection module is connected with a collector and an emitter of a switching tube, and the input end of the fault detection module is connected with a driving chip and is used for judging whether the switching tube has a short-circuit fault according to the voltage between the collector and the emitter when the switch is switched on; the input end of the driving chip inputs PWM (Pulse Width Modulation) waves, and the output end of the driving chip is connected with the grid electrode of the switching tube and used for reducing the grid electrode voltage of the switching tube after the switching tube has a short-circuit fault. The method comprises the steps of judging whether the switching tube has short-circuit fault according to the voltage between a collector and an emitter of the switching tube when the switching tube is conducted, and reducing the grid voltage of the switching tube after the switching tube is judged to have the fault.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

when the switch tube is conducted and short-circuited, the resistance value is low. Therefore, it is impossible to accurately determine whether a short-circuit fault occurs or not by the magnitude of the voltage.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a method and a device for detecting faults of an air conditioner variable frequency inversion module, an air conditioner and a storage medium, so as to improve the accuracy of fault judgment.

In some embodiments, the method comprises: the air conditioner variable frequency inversion module comprises an upper bridge circuit and a lower bridge circuit which are formed by a plurality of switch tubes; the number of bridge arms of the bridge circuit is matched with the number of phases of alternating current output by the variable-frequency inversion module; the method comprises the following steps: under the condition that the wiring of the air conditioner compressor is disconnected, the trigger signals of the switch tubes in the upper bridge circuit and the lower bridge circuit are controlled according to a preset sequence, so that the switch tubes have conduction conditions; detecting the current of a bridge arm where the switched-on switching tube is positioned; and judging whether the frequency conversion inversion module has a fault or not according to the detected current and the current threshold.

In some embodiments, the apparatus comprises: the trigger signal input module is connected with the grid electrodes of the switching tubes in the upper bridge circuit and the lower bridge circuit of the variable-frequency inversion module and is used for providing trigger signals for the switching tubes so as to switch on or switch off the switching tubes; and the current detection module comprises sampling resistors which are connected in series with the bridge arms in the upper and lower bridge circuits and used for detecting the current on the bridge arms.

In some embodiments, the apparatus comprises: the fault detection method for the air conditioner variable frequency inverter module comprises a processor and a memory, wherein the memory stores program instructions, and the processor is configured to execute the fault detection method for the air conditioner variable frequency inverter module when the program instructions are executed.

In some embodiments, the air conditioner includes: the device for detecting the fault of the air conditioner variable frequency inversion module is described in the foregoing.

In some embodiments, the storage medium stores program instructions, and when executed, the program instructions perform the method for detecting the fault of the air conditioner variable frequency inverter module.

The method and the device for detecting the fault of the variable frequency inversion module of the air conditioner, the air conditioner and the storage medium provided by the embodiment of the disclosure can realize the following technical effects:

and by utilizing the characteristic of short circuit when the switching tube is in fault, the switching tubes of the bridge arms in the upper bridge circuit and the lower bridge circuit are controlled to be conducted according to a preset sequence, and the current of the bridge arm where the switching tube is located is detected. And judging whether the frequency conversion inversion module has a fault or not according to the magnitude of the current. Thus, when the switching tube is short-circuited, the bridge arm generates a large current. Therefore, whether the fault occurs can be accurately judged by detecting the current. The misjudgment rate is reduced.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

fig. 1 is a schematic diagram of an apparatus for detecting a fault of an air conditioner inverter module according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a method for detecting a fault of an inverter module of an air conditioner according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of another method for detecting a fault of an air conditioner inverter module according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram of another method for detecting a fault of an air conditioner inverter module according to an embodiment of the present disclosure;

fig. 5 is a schematic diagram of an apparatus for detecting a fault of an inverter module of an air conditioner according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram of another apparatus for detecting faults of an air conditioner inverter module according to an embodiment of the present disclosure.

Detailed Description

So that the manner in which the features and advantages of the embodiments of the present disclosure can be understood in detail, a more particular description of the embodiments of the disclosure, briefly summarized above, may be had by reference to the appended drawings, which are included to illustrate, but are not intended to limit the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged as appropriate for the embodiments of the disclosure described herein. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

The term "plurality" means two or more unless otherwise specified.

In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. E.g., a and/or B, represents: a or B, or A and B.

The term "correspond" may refer to an association or binding relationship, and a corresponding to B refers to an association or binding relationship between a and B.

The variable frequency inversion module in the outdoor unit of the air conditioner comprises an upper bridge circuit and a lower bridge circuit which are formed by a plurality of switching tubes; the number of bridge arms of the bridge circuit is matched with the number of phases of the alternating current output by the variable-frequency inversion module. The upper end and the lower end of the upper bridge circuit and the lower bridge circuit, namely the input end, are connected with direct current voltage; the output ends are respectively connected with the leading-out ends of the compressor motor windings. Thereby inverting the direct current to alternating current. Optionally, the switch tube is an IGBT (Insulated Gate bipolar transistor). Here, the description will be given taking an example of outputting three-phase alternating current.

Referring to fig. 1, the frequency conversion inverter module includes an upper bridge circuit and a lower bridge circuit formed by 6 IGBTs, wherein each upper IGBT and each lower IGBT form a bridge arm, and each bridge arm includes an upper bridge arm and a lower bridge arm. Two ends of each bridge arm are connected with direct current voltage, and the connection point of the upper bridge arm and the lower bridge arm is an output end and is one phase of three-phase voltage. Here, the upper arm is connected to the positive terminal of the dc voltage, and the lower arm is connected to the negative terminal of the dc voltage. The output ends of the bridge arms are shown in fig. 1, the output ends of the bridge arms formed by the IGBTs 1 and 2 are connected with U-phase, and the bridge arms are defined as U-phase bridge arms. The output end of a bridge arm formed by the IGBT3 and the IGBT4 is connected with a V phase, and the bridge arm is defined as a V-phase bridge arm. The output end of a bridge arm formed by the IGBT5 and the IGBT6 is connected with a W phase, and the bridge arm is defined as a W-phase bridge arm. The grid electrode of each IGBT is connected with a control end, and the control end controls the on-off of the IGBT by sending a PWM signal.

The specific working process is as follows: when the control end controls the grid input signal UP of the IGBT1 to be at a high level and the grid input signal UN of the IGBT2 to be at a low level, the upper bridge arm of the U-phase bridge arm is switched on, and the lower bridge arm is switched off. Thus, the U-phase voltage of the compressor motor is the positive terminal voltage value of the DC voltage of the bridge circuit, i.e., DC +. Conversely, when the gate input signal UP of the control terminal controlling IGBT1 is at a low level and the gate input signal UN of the IGBT2 is at a high level, the upper arm of the U-phase arm is turned off and the lower arm is turned on. Thus, the U-phase voltage of the compressor motor is DC-which is the negative terminal voltage of the DC voltage of the bridge circuit. Likewise, the operation of the other two phases can be known.

As shown in fig. 1, the apparatus for detecting the fault of the air conditioner frequency conversion inverter module includes: the device comprises a trigger signal input module and a current detection module. The trigger signal input module is connected with the grid electrodes of the switching tubes in the upper bridge circuit and the lower bridge circuit of the frequency conversion inversion module and used for providing trigger signals for the switching tubes to be switched on or switched off. And the current detection module comprises sampling resistors which are connected in series with the bridge arms in the upper and lower bridge circuits and used for detecting the current on the bridge arm. Specifically, the trigger signal of the IGBT1 is UP, the trigger signal of the IGBT2 is UN, the sampling resistance on the U-phase arm is RSU1, and the sampling current is IU. The trigger signal of the IGBT3 is VP, the trigger signal of the IGBT4 is VN, the sampling resistance on the V-phase bridge arm is RSU2, and the sampling current is IV. The trigger signal of the IGBT5 is WP, the trigger signal of the IGBT4 is WN, the sampling resistance on the W-phase bridge arm is RSU3, and the sampling current is IW.

Referring to fig. 2, an embodiment of the present disclosure provides a method for detecting a fault of an air conditioner variable frequency inverter module, including:

s101, under the condition that the wiring of the air conditioner compressor is disconnected, a control end controls trigger signals of all switch tubes in an upper bridge circuit and a lower bridge circuit according to a preset sequence, so that all the switch tubes have conduction conditions.

And S102, detecting the current of a bridge arm where the switch tube is located after the switch tube is conducted by the current sensor.

And S103, the control end judges whether the frequency conversion inversion module has a fault according to the detected current and the current threshold.

Here, when the inverter module fails, it appears as an IGBT short circuit. Therefore, during the fault detection, the detection is performed by using the characteristic that the IGBT is short-circuited. In detail, the wiring of the compressor is disconnected, and then the trigger signals of the IGBTs in the upper bridge circuit and the lower bridge circuit are sequentially controlled according to a preset sequence, so that the IGBTs are switched on. And detecting the current of the sampling resistor of the bridge arm where the conducted IGBT is located. And finally, judging whether the bridge arm has a fault or not according to the detected current and the current threshold. By analogy, the fault conditions of all bridge arms are judged, and whether the frequency conversion inversion module has faults or not is determined. When the bridge arm has an IGBT short circuit, the bridge arm generates a large current. Therefore, whether the fault occurs can be accurately judged by detecting the current.

In addition, the preset sequence is a preset IGBT conducting sequence, and the specific position where the fault is located is judged mainly based on the sequence. The value of the current threshold depends on the circuit layout and the circuit devices. In general, when the IGBT is turned off, a leakage current also exists inside the IGBT. Therefore, even when the bridge arm is not conductive, a very small current is present. A current threshold is set for defining the magnitude of the current.

By adopting the method for detecting the fault of the air conditioner variable frequency inversion module, the switching tubes of the bridge arms in the upper bridge circuit and the lower bridge circuit are controlled to be conducted according to the preset sequence by utilizing the characteristic of short circuit when the switching tubes are in fault, and the current of the bridge arm where the switching tube is located is detected. And judging whether the frequency conversion inversion module has a fault or not according to the magnitude of the current. Thus, when the switching tube is short-circuited, the bridge arm generates a large current. Therefore, whether the fault occurs or not can be accurately judged by detecting the current. The misjudgment rate is reduced.

Optionally, in step S101, the control end controls the trigger signals of the switching tubes in the upper and lower bridge circuits according to a preset sequence, including

The control end controls the switching tubes in the bridge arms corresponding to each phase of alternating current to trigger the upper bridge arm and the lower bridge arm in sequence according to the phase sequence of the output alternating current; or the like, or, alternatively,

and the control end controls the switching tubes in the upper and lower bridge arm groups to trigger in the phase sequence of alternating current according to the sequence of the upper and lower bridge arms.

In the embodiment of the present disclosure, the alternating current output by the frequency conversion inverter module is a three-phase alternating current, that is, UVW three-phase. And each leg of the bridge circuit has an upper leg and a lower leg. During detection, whether the bridge arm where the IGBT is located has a fault needs to be judged by conducting the IGBT, and whether the fault is an upper bridge arm or a lower bridge arm is further determined. At this time, the control terminal is required to preset the turn-on sequence of the IGBT so as to determine a fault point according to the detected current.

Specifically, the preset sequence may be based on a fixed alternating-current phase sequence, and the IGBT is turned on by controlling the bridge arm corresponding to each phase of alternating current to be connected to the upper bridge arm and the lower bridge arm, or by controlling the bridge arm to be connected to the lower bridge arm and the upper bridge arm in sequence. As an example, the preset sequence is a bridge arm detection sequence corresponding to UVW, and each bridge arm detects the upper bridge arm first and then detects the lower bridge arm. Thus, the final IGBT conduction sequence is IGBT1, IGBT2, IGBT3, IGBT4, IGBT5, and IGBT 6. The corresponding trigger signals are UP, UN, VP, VN, WP, WN. As another example, the preset sequence is a detection sequence of the bridge arms corresponding to UVW, and each bridge arm detects the lower bridge arm first and then detects the upper bridge arm. In this way, the sequence of the trigger signals corresponding to the turn-on of the IGBT is UN, UP, VN, VP, WN, WP finally. By analogy, the sequence of the trigger signals of the upper bridge arm and the lower bridge arm or the lower bridge arm and the upper bridge arm which are sequentially conducted when the preset sequence is VDU, WUV, UWV, VUW and WVU can be obtained.

Likewise, the preset sequence may be based on a fixed bridge arm sequence, and the control of the phase sequence of the alternating current in each bridge arm is performed. As an example, the preset sequence is to detect the upper bridge arms of all bridge arms first, and then detect the lower bridge arms of all bridge arms. And each upper bridge arm and each lower bridge arm are triggered according to the UVW phase sequence of the alternating current. Thus, the final IGBT conduction sequence is IGBT1, IGBT3, IGBT5, IGBT2, IGBT4, and IGBT 6. The corresponding trigger signals are UP, VP, WP, UN, VN, WN. By analogy, the sequence of the trigger signals for the IGBTs in other phases to be conducted when the upper bridge arm is detected and then the lower bridge arm is detected can be obtained. And acquiring a trigger signal sequence corresponding to the alternating current out-of-phase sequence when the lower bridge arm is detected firstly and then the upper bridge arm is detected.

Optionally, in step S102, the detecting, by a current sensor, a current of a bridge arm where the switching tube is located after being turned on includes: the current sensor detects the current of the sampling resistor of the bridge arm where the switch tube is located after being conducted.

Here, if one IGBT in one arm fails, the dc power supply is short-circuited when the other IGBT is turned on. And further, the instantaneous current in the bridge arm is overlarge, so that the IGBT fault is caused. Therefore, a sampling resistor needs to be connected in series with each bridge arm during detection. Therefore, on one hand, the detection current can be collected, and on the other hand, the switch tube can be effectively protected.

With reference to fig. 3, another method for detecting a fault of an inverter module of an air conditioner according to an embodiment of the present disclosure includes:

s201, under the condition that the wiring of the air conditioner compressor is disconnected, the control end controls the trigger signals of the switch tubes in the upper bridge circuit and the lower bridge circuit according to a preset sequence, so that the switch tubes have conduction conditions.

And S202, detecting the current of the bridge arm where the switched-on switching tube is located by the current sensor.

S231, the control end compares the detected current with the current threshold value.

And S232, if the detected current is larger than the current threshold, the control end determines that the frequency conversion inversion module has a fault.

And S233, if the detected current is less than or equal to the current threshold, the control end determines that the frequency conversion inversion module is normal.

Here, each bridge arm is composed of two IGBTs. When one IBGT is short-circuited, the bridge arm is in a conducting state when the other IGBT is conducted. And the bridge arm can generate a larger current value. And when one IBGT is not in fault, the bridge arm can not be conducted when the other IGBT is conducted. Therefore, whether the other IGBT of each bridge arm has a fault can be judged according to the current condition when one IGBT of each bridge arm is conducted. Therefore, whether the frequency conversion inversion module fails or not can be accurately judged, and the position of the failure can be positioned.

As an example, the turn-on sequence of each IGBT is set to IGBT1, IGBT2, IGBT3, IGBT4, IGBT5, and IGBT 6. The failure determination of the U-phase arm will be described as an example. The input signal UP of the IGBT1 is controlled to be high level, and the IGBT1 is turned on. At this time, if the IGBT2 is normal, the IGBT2 is in an off state because it does not receive a high level signal that is turned on. The U-phase arm formed by the IGBT1 and the IGBT2 is not turned on, and no large current flows through the sampled voltage RSU 1. I.e. the detection current IU is smaller than the current threshold In. If the IGBT2 fails, namely is short-circuited, the U-phase bridge arm is conducted. That is, a top-down current is generated across the sampling resistor RSU 1. That is, the current flows from the IGBT1 and the IGBT2 to the sampling resistor RUS 1. At this time, the detected current value is larger and approximately equal to the ratio of the direct current voltage to the sampling resistor.

Optionally, in step S232, if the detected current is greater than the current threshold, the control end determines that the frequency conversion inverter module has a fault, including:

and the control end determines the bridge arm where the fault is located according to the switched-on switching tube corresponding to the current.

Here, by controlling the on state of the IGBT, the current of the sampling resistor of the arm in which the IGBT is located is detected. And judging whether the bridge arm has a fault or not and judging the fault point. Specifically, the failure determination of the U-phase arm will be described as an example. And controlling the IGBT1 to be conducted, namely the upper bridge arm of the U-phase bridge arm to be conducted, and if the detected current IU is larger than the current threshold In, judging that the U-phase bridge arm has a fault. And the IGBT2 of the lower arm of the U-phase arm with the fault point as short circuit is determined. The specific analysis of the fault point determination is detailed in the foregoing. Thus, the fault point can be accurately positioned.

With reference to fig. 4, another method for detecting a fault of an inverter module of an air conditioner according to an embodiment of the present disclosure includes:

s301, under the condition that the wiring of the air conditioner compressor is disconnected, the control end controls the trigger signals of the switch tubes in the upper bridge circuit and the lower bridge circuit according to a preset sequence, wherein the interval duration of adjacent trigger signals is longer than a preset duration.

In the embodiment of the present disclosure, when the IGBT is turned on, the interval duration of sending the adjacent trigger signals is set. Wherein the preset time is 1 ms. The interval duration of the trigger signal is longer than the preset duration. Therefore, the current signal on the sampling resistor cannot be detected in time. In addition, the pulse width of the transmitted PWM signal should not be too long to avoid that the IGBT cannot be turned on. Here, the pulse width of the PWM signal is less than 5 us.

Referring to fig. 5, the present disclosure provides an apparatus for detecting a fault of an air conditioner inverter module, which includes a control module 51, a detection module 52, and a determination module 53. The control module 51 is configured to control the trigger signals of the switching tubes in the upper and lower bridge circuits according to a preset sequence so that the switching tubes have conduction conditions when the wiring of the air conditioner compressor is disconnected; the detection module 52 is configured to detect a current of a bridge arm where the switching tube is located after being turned on; the determining module 53 is configured to determine whether the frequency conversion inverter module fails according to the current and the current threshold.

By adopting the device for detecting the fault of the air conditioner variable frequency inversion module, the switching tubes of the bridge arms in the upper bridge circuit and the lower bridge circuit are controlled to be conducted according to the preset sequence by utilizing the characteristic of short circuit when the switching tubes are in fault, and the current of the bridge arm where the switching tubes are located is detected. And judging whether the frequency conversion inversion module has a fault or not according to the magnitude of the current. Thus, when the switching tube is short-circuited, a large current is generated in the arm where the switching tube is located. Therefore, whether the fault occurs or not can be accurately judged by detecting the current. The misjudgment rate is reduced.

Referring to fig. 6, an apparatus for detecting a fault of an air conditioner inverter module according to an embodiment of the present disclosure includes a processor (processor)100 and a memory (memory) 101. Optionally, the apparatus may also include a Communication Interface (Communication Interface)102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other through the bus 103. The communication interface 102 may be used for information transfer. The processor 100 may call logic instructions in the memory 101 to execute the method for detecting the fault of the air conditioner inverter module according to the above embodiment.

In addition, the logic instructions in the memory 101 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.

The memory 101 is used as a computer readable storage medium for storing software programs, computer executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes functional applications and data processing by executing program instructions/modules stored in the memory 101, that is, implements the method for detecting the fault of the air conditioner inverter module in the above embodiment.

The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. In addition, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.

The embodiment of the disclosure provides an air conditioner, which comprises the device for detecting the fault of the air conditioner variable frequency inversion module.

The embodiment of the disclosure provides a storage medium storing computer-executable instructions configured to execute the above method for detecting the fault of the air conditioner variable frequency inverter module.

The storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.

The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.

The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. Furthermore, the words used in the specification are words of description for example only and are not limiting upon the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosure, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.

Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be only one type of logical functional division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims

1. A method for detecting the fault of an air conditioner frequency conversion inversion module is characterized in that the air conditioner frequency conversion inversion module comprises an upper bridge circuit and a lower bridge circuit which are formed by a plurality of switching tubes; the number of bridge arms of the bridge circuit is matched with the number of phases of alternating current output by the variable-frequency inversion module; the method comprises the following steps:

under the condition that the wiring of the air-conditioning compressor is disconnected, the trigger signals of the switch tubes in the upper bridge circuit and the lower bridge circuit are controlled according to a preset sequence, so that the switch tubes have conduction conditions;

detecting the current of a bridge arm where the switched-on switching tube is positioned;

and judging whether the frequency conversion inversion module has a fault or not according to the detected current and the current threshold.

2. The method according to claim 1, wherein the controlling the trigger signals of the switching tubes in the upper and lower bridge circuits according to the preset sequence comprises:

controlling a switching tube in a bridge arm corresponding to each phase of alternating current to trigger an upper bridge arm and a lower bridge arm in sequence according to the phase sequence of the output alternating current; or the like, or, alternatively,

and controlling the switching tubes in the upper and lower bridge arm groups to trigger in the phase sequence of alternating current according to the sequence of the upper and lower bridge arms.

3. The method according to claim 1, wherein each bridge arm of the bridge circuit is connected in series with a sampling resistor, and the detecting the current of the bridge arm where the switched-on switching tube is located comprises:

and detecting the current of the sampling resistor of the bridge arm where the switched-on switching tube is positioned.

4. The method of claim 1, wherein determining whether the variable frequency inverter module is faulty according to the detected current and the current threshold comprises:

determining a fault of the variable frequency inversion module under the condition that the detected current is greater than the current threshold;

and determining that the frequency conversion inversion module is normal under the condition that the detected current is less than or equal to the current threshold value.

5. The method of claim 4, wherein determining a variable frequency inversion module fault if the detected current is greater than the current threshold comprises:

and determining a bridge arm where the fault is located according to the switched-on switching tube corresponding to the detection current.

6. The method according to any one of claims 1 to 5, wherein the controlling the trigger signals of the switching tubes in the upper and lower bridge circuits according to the preset sequence comprises:

and controlling the interval duration of the adjacent trigger signals to be greater than the preset duration.

7. The utility model provides a device for air conditioner frequency conversion contravariant module fault detection which characterized in that includes:

the trigger signal input module is connected with the grid electrodes of the switching tubes in the upper bridge circuit and the lower bridge circuit of the variable-frequency inversion module and is used for providing trigger signals for the switching tubes so as to switch on or switch off the switching tubes;

and the current detection module comprises sampling resistors which are connected in series with the bridge arms in the upper bridge circuit and the lower bridge circuit and used for detecting the current on the bridge arms.

8. An apparatus for detecting a fault of an air conditioner inverter module, comprising a processor and a memory storing program instructions, wherein the processor is configured to execute the method for detecting a fault of an air conditioner inverter module according to any one of claims 1 to 6 when executing the program instructions.

9. An air conditioner, characterized by comprising the device for detecting the fault of the air conditioner variable frequency inverter module according to claim 8 or 9.

10. A storage medium storing program instructions, characterized in that when running, the program instructions perform the method for detecting fault of air conditioner inverter module according to any one of claims 1 to 6.