CN108196136B - Three-phase electricity detection method and device and air conditioner outdoor unit - Google Patents
Three-phase electricity detection method and device and air conditioner outdoor unit Download PDFInfo
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Abstract
The embodiment of the invention discloses a three-phase electric detection method and device and an air conditioner outdoor unit, relates to the field of household appliance manufacturing, and can improve the function of a phase-lack detection technology and improve the stability of a system. The three-phase electric detection method is applied to an alternating current-direct current conversion circuit, wherein the alternating current-direct current conversion circuit comprises a filter and a rectifier, the input end of the filter is connected with an alternating current bus, the output end of the filter is connected with the input end of the rectifier, and the output end of the rectifier is connected with a direct current bus; three-phase alternating current is input into the filter through an alternating current bus; the three-phase electric detection device detects the filtered alternating current bus voltage at the output end of the filter and the voltage on the direct current bus; and when the filtered alternating-current bus voltage and the voltage on the direct-current bus are determined to meet the preset condition, determining that the three-phase alternating current is not in phase failure.
Description
Technical Field
The embodiment of the invention relates to the field of household appliance manufacturing, in particular to a three-phase power detection method and device and an air conditioner outdoor unit.
Background
Many outdoor unit air conditioner products use three-phase power supply to supply power, if the condition of default phase takes place to complete machine product very big danger in the product electricity use. For example, after the L1 phase, L2 phase, and L3 phase of the three-phase ac power supply are out of phase with the L1 phase, the other two phases, L2 phase and L3 phase, generate large current, which is likely to cause the danger of wire burnout and even the burnout of the whole machine; if the diameter of the wiring line is selected to be thicker, the subsequent rectifier silicon bridge, the compressor and the frequency conversion module of the fan motor are easy to burn out, and even if the subsequent rectifier silicon bridge, the compressor and the frequency conversion module of the fan motor are not burnt out, the service life of the devices including the electrolytic capacitor is greatly influenced. In order to avoid the phenomenon, the outdoor unit air conditioner is provided with a three-phase detection loop to check the phase failure. The three-phase detection loop of a general air conditioner can select to get electricity at the output end of the filter, so that the electricity cannot be detected if the rear end of the filter is in phase loss, and the danger can also occur, so that the phase loss detection technology provided by the prior art is not perfect.
Disclosure of Invention
The embodiment of the invention provides a three-phase electric detection method and device and an air conditioner outdoor unit, which can perfect the function of a phase-lack detection technology and improve the stability of a system.
The method comprises the steps that on the first aspect, a three-phase electric detection method is applied to an alternating current-direct current conversion circuit, wherein the alternating current-direct current conversion circuit comprises a filter and a rectifier, the input end of the filter is connected with an alternating current bus, the output end of the filter is connected with the input end of the rectifier, and the output end of the rectifier is connected with a direct current bus; three-phase alternating current is input into the filter through an alternating current bus; the three-phase electric detection device detects the filtered alternating current bus voltage at the output end of the filter and the voltage on the direct current bus; and when the filtered alternating-current bus voltage and the voltage on the direct-current bus are determined to meet the preset condition, determining that the three-phase alternating current is not in phase failure.
In a second aspect, a three-phase electric detection apparatus is provided, which is applied to an ac-dc conversion circuit, wherein the ac-dc conversion circuit includes a filter and a rectifier, an input end of the filter is connected to an ac bus, an output end of the filter is connected to an input end of the rectifier, and an output end of the rectifier is connected to a dc bus; the three-phase alternating current power supply is input into the filter through an alternating current bus; the detection unit is used for detecting the filtered alternating current bus voltage at the output end of the filter and the voltage on the direct current bus; and the processing unit is used for determining that the three-phase alternating-current power supply does not have a phase failure when the filtered alternating-current bus voltage detected by the detection unit and the voltage on the direct-current bus meet the preset condition.
In a third aspect, a three-phase electric detection apparatus is provided, including: an interface, a processor, a memory, a bus; the memory is used for storing computer execution instructions, the processor is connected with the memory through the bus, and when the three-phase electric detection device runs, the processor executes the computer execution instructions stored in the memory so as to enable the three-phase electric detection device to execute the method.
In a fourth aspect, there is provided a computer storage medium comprising instructions which, when run on a computer, cause the computer to perform the method described above.
In a fifth aspect, an outdoor unit of an air conditioner is provided, which includes an ac/dc conversion circuit, a compressor inverter, a fan motor inverter, and the three-phase electric detection device, where the ac/dc conversion circuit is used to supply power to the compressor inverter and the fan motor inverter, and the three-phase electric detection device is connected to a driving circuit of the compressor inverter and a driving circuit of the fan motor inverter;
when the three-phase electric detection device determines that the three-phase alternating-current power supply is not in phase failure, outputting a first control signal to a driving circuit of the compressor frequency converter, so that the driving circuit of the compressor frequency converter drives the compressor frequency converter to output driving voltage to the compressor according to the first control signal; and outputting a second control signal to a driving circuit of the fan motor frequency converter, so that the driving circuit of the fan motor frequency converter drives the fan motor frequency converter to output driving voltage to the fan motor according to the second control signal.
In the scheme, the provided three-phase electric detection method is applied to an alternating current-direct current conversion circuit, the alternating current-direct current conversion circuit comprises a filter and a rectifier, the input end of the filter is connected with an alternating current bus, the output end of the filter is connected with the input end of the rectifier, and the output end of the rectifier is connected with a direct current bus; the three-phase alternating current power supply is input into the filter through the alternating current bus; the three-phase electric detection device detects the filtered alternating current bus voltage at the output end of the filter and the voltage on the direct current bus; when the filtered alternating-current bus voltage and the voltage on the direct-current bus meet the preset conditions, determining that the three-phase alternating-current power supply is not in phase failure; therefore, the phase loss detection of the three-phase alternating-current power supply is carried out by combining the filtered alternating-current bus voltage at the output end of the filter and the voltage on the direct-current bus connected with the output end of the rectifier, and compared with the prior art in which the phase loss detection is carried out by only referring to the power taking at the output end of the filter, the phase loss detection method can perfect the function of the phase loss detection technology and improve the stability of the system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic connection diagram of a three-phase electrical detection apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a three-phase electrical detection apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an outdoor unit of an air conditioner according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a three-phase electrical detection apparatus according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the embodiment of the present application is applied to an ac-dc conversion circuit, where the ac-dc conversion circuit includes a filter 11 and a rectifier 12, an input end of the filter 11 is connected to ac bus lines L1, L2, and L3, an output end of the filter 12 is connected to an input end of the rectifier 12, and an output end of the rectifier 12 is connected to a dc bus line P, N; the three-phase alternating current power supply is input into the filter through the alternating current bus; among them, the ac bus of the general three-phase ac power supply includes: an L1 ac bus, an L2 ac bus, an L3 ac bus, and a neutral line.
S101, the three-phase electric detection device 13 detects the filtered alternating current bus voltage at the output end of the filter and the voltage on the direct current bus.
The output end of the filter 12 is connected to the input end of the rectifier 12 through transmission lines L1 ', L2 ', L3 ' and a zero line ', the filter 11 filters the voltage on the L1 ac bus and outputs the voltage to the transmission line L1 ', the filter 11 filters the voltage on the L2 ac bus and outputs the voltage to the transmission line L2 ', and the filter 11 filters the voltage on the L3 ac bus and outputs the voltage to the transmission line L3 '. The three-phase electric detection device detects the filtered alternating current bus voltage at the output end of the filter, namely the voltage between the detection transmission lines L1 ', L2' and L3 'and the zero line', and detects the voltage on the direct current bus, namely the voltage between the direct current buses P and N.
And S102, when the filtered alternating current bus voltage and the voltage on the direct current bus are determined to meet the preset condition, determining that the three-phase alternating current power supply is not in phase failure.
Specifically, when V is determinedPN∈[(1-α)Vj*31/2*21/2，(1+α)Vj*31/2*21/2]When the three-phase alternating current power supply is in phase failure, determining that the three-phase alternating current power supply is not in phase failure, wherein the voltage V is not less than 0 and is not more than α and less than 1PNIs the voltage on the DC bus, Vj＝VL1＝VL2＝VL3，VL1Is the filtered L1 AC bus voltage, VL2Is the filtered L2 AC bus voltage, VL3Is the filtered L3 ac bus voltage. When the three-phase AC power supply is not in phase failure and the three-phase is electrically balanced, the PN end voltage of the DC bus is Vj*31/2*21/2. For example, the following steps are carried out: assuming that the three-phase alternating current power supply is 380V power supply, each phase voltage after filtering is 220V. When the phase is not open, the voltage of the PN end of the direct current bus is 537V, and when the voltage fluctuation is considered, the voltage of each phase after filtering is 220 +/-10%, and the voltage of the PN end of the direct current bus is 483V-590V. When the voltage of the PN end of the direct current bus is smaller than the minimum value of the value range, the possibility of phase failure of the three-phase alternating current power supply is shown.
In the scheme, the provided three-phase electric detection method is applied to an alternating current-direct current conversion circuit, the alternating current-direct current conversion circuit comprises a filter and a rectifier, the input end of the filter is connected with an alternating current bus, the output end of the filter is connected with the input end of the rectifier, and the output end of the rectifier is connected with a direct current bus; the three-phase alternating current power supply is input into the filter through the alternating current bus; the three-phase electric detection device detects the filtered alternating current bus voltage at the output end of the filter and the voltage on the direct current bus; when the filtered alternating-current bus voltage and the voltage on the direct-current bus meet the preset conditions, determining that the three-phase alternating-current power supply is not in phase failure; therefore, the phase loss detection of the three-phase alternating-current power supply is carried out by combining the filtered alternating-current bus voltage at the output end of the filter and the voltage on the direct-current bus connected with the output end of the rectifier, and compared with the prior art in which the phase loss detection is carried out by only referring to the power taking at the output end of the filter, the phase loss detection method can perfect the function of the phase loss detection technology and improve the stability of the system.
In addition, if the three-phase alternating current power supply is determined to be in phase failure, the filtered alternating current bus current is obtained, and the alternating current bus in the phase failure is determined according to the filtered alternating current bus current. Specifically, phase currents of the transmission lines L1 ', L2 ', and L3 ' are detected. When the three-phase ac power source is not out of phase and the three-phase is balanced, the phase currents on the transmission lines L1 ', L2' and L3 'are distributed according to the load at the rear end, for example, as shown in fig. 3, the currents flowing through the transmission lines L1', L2 'and L3' take power for the compressor frequency converter, and the transmission line L3 'simultaneously takes power for the fan motor frequency converter, so the phase currents on the transmission lines L1' and L2 'are equal, and the phase current on the transmission line L3' is slightly larger than the phase currents on the transmission lines L1 'and L2'. When the phase L1 of the AC bus is in phase failure, the phase current on the transmission lines L2 'and L3' can be increased sharply and is far larger than the designed value of the phase current of the whole machine, the three-phase AC power supply is in phase failure, and the phase with the smallest current can be judged as the phase failure. In addition, when three-phase unbalance occurs, the three-phase unbalance rate can be calculated and judged according to the phase current values on the transmission lines L1 ', L2 ' and L3 ', and protection is carried out according to design requirements.
Referring to fig. 2, there is provided a three-phase electric detection apparatus for implementing the above method including:
the detection unit 21 is configured to detect a filtered ac bus voltage at an output end of the filter and a voltage on the dc bus;
and the processing unit 22 is configured to determine that the three-phase ac power supply does not have a phase failure when it is determined that the filtered ac bus voltage detected by the detecting unit 21 and the voltage on the dc bus satisfy a predetermined condition.
Optionally, the ac bus includes: an L1 alternating current bus, an L2 alternating current bus, and an L3 alternating current bus; a processing unit 22, in particular for determining VPN∈[(1-α)Vj*31/2*21/2，(1+α)Vj*31/2*21/2]When the three-phase alternating current power supply is in phase failure, determining that the three-phase alternating current power supply is not in phase failure, wherein the voltage V is not less than 0 and is not more than α and less than 1PNIs the voltage on the DC bus, Vj＝VL1＝VL2＝VL3，VL1Is the filtered L1 AC bus voltage, VL2Is the filtered L2 AC bus voltage, VL3Is the filtered L3 ac bus voltage.
The processing unit 22 is further configured to, if it is determined that the three-phase ac power supply is in a phase failure, obtain, by the detection unit, the filtered ac bus current, and determine, according to the filtered ac bus current, the ac bus in which the phase failure occurs.
All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and the function thereof is not described herein again.
Referring to fig. 3, an embodiment of the present application provides an outdoor unit of an air conditioner, including an ac/dc conversion circuit 31, a compressor inverter 32, and a fan motor inverter 33, where the ac/dc conversion circuit 31 is configured to supply power to the compressor inverter 32 and the fan motor inverter 33, and further includes: the three-phase electric detection device 34 is connected with a driving circuit 35 of the compressor frequency converter and a driving circuit 36 of the fan motor frequency converter;
when the three-phase electric detection device 34 determines that the three-phase alternating-current power supply (L1, L2, L3) is not in phase failure, a first control signal is output to the drive circuit 35 of the compressor inverter, so that the drive circuit 35 of the compressor inverter drives the compressor inverter 32 to output a drive voltage to the compressor 37 according to the first control signal; the second control signal is output to the drive circuit 36 of the fan motor inverter so that the drive circuit 36 of the fan motor inverter drives the fan motor inverter 33 to output the drive voltage to the fan motor 38 according to the second control signal.
When the three-phase electric detection device 34 determines that the three-phase alternating-current power supply (L1, L2, L3) has a phase loss, the three-phase electric detection device is further used for outputting a third control signal to the drive circuit 35 of the compressor inverter, so that the drive circuit 35 of the compressor inverter stops the compressor inverter 32 from outputting the drive voltage to the compressor 37 according to the third control signal; the fourth control signal is output to the drive circuit 36 of the fan motor inverter so that the drive circuit 36 of the fan motor inverter stops the fan motor inverter 33 from outputting the drive voltage to the fan motor 38 according to the fourth control signal.
For example, the three-phase power detection device 34 may be a main control module of an outdoor unit of an air conditioner, and may be a logic control integrated circuit such as a CPU, an MCU, or an FPGA, so that the functions of the three-phase power detection device 34 are integrated into the main control module, which may simplify the system structure. The air conditioner outdoor machine also provides a low-voltage power supply for each control module, an electromagnetic switch K and a current-limiting resistor R1 are connected in series on a direct current bus P, and smoothing resistors C1 and C2 are connected in series between the direct current buses P and N, wherein a balancing resistor R2 is connected in parallel to the C1, and a balancing resistor R3 is connected in parallel to the C2. One or more of the transmission lines L1 ', L2 ', L3 ' are also provided with a fuse, such as a fuse S.
Further, in the case of employing an integrated unit, the three-phase electric detection device includes: the device comprises a storage unit, a processing unit and an interface unit. The processing unit is used for controlling and managing the action of the three-phase electric detection device, for example, the processing unit is used for supporting the three-phase electric detection device to execute the process S102. A storage unit for storing program codes and data of the information transmitting apparatus. The interface unit is used for connecting with other external equipment and performing information interaction with other equipment to realize the function of the detection unit, such as the filtered alternating current bus voltage at the output end of the filter detected by the sensor and the voltage on the direct current bus, which are connected with the sensor.
For example, the processing unit is a processor, the storage unit is a memory, and the interface unit is an interface. The three-phase electric detection device shown in fig. 4 includes an interface 401, a processor 402, a memory 403, and a bus 404, where the interface 401 and the processor 402 are connected to the memory 403 through the bus 404.
The Memory 403 may be a Read-Only Memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), magnetic Disc storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to these. The memory may be self-contained and coupled to the processor via a bus. The memory may also be integral to the processor.
The memory 403 is used for storing application program codes for executing the scheme of the application, and the processor 402 controls the execution. The interface 401 is configured to receive input from an external device, such as a filtered ac bus voltage at the output of the filter and a voltage on the dc bus detected by the sensor, and the processor 402 is configured to execute application program codes stored in the memory 403, so as to implement the method described in the embodiment of the present application.
Further, a computing storage medium (or media) is also provided, comprising instructions which, when executed, perform the operations of the method in the above embodiments.
Additionally, a computer program product is also provided, comprising the above-described computing storage medium (or media).
It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
Those of ordinary skill in the art will 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 depends upon the particular application and design constraints imposed on the implementation. 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 present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or 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 place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention 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 functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing 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 according to the embodiments of the present invention. And the aforementioned storage medium includes: 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.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A three-phase electric detection method is applied to an alternating current-direct current conversion circuit, wherein the alternating current-direct current conversion circuit comprises a filter and a rectifier, the input end of the filter is connected with an alternating current bus, the output end of the filter is connected with the input end of the rectifier, and the output end of the rectifier is connected with a direct current bus; the three-phase alternating current power supply is input into the filter through an alternating current bus; it is characterized in that the preparation method is characterized in that,
the alternating current bus includes: an L1 alternating current bus, an L2 alternating current bus, and an L3 alternating current bus;
the three-phase electric detection device detects the filtered alternating current bus voltage at the output end of the filter and the voltage on the direct current bus;
when it is determined that the filtered alternating-current bus voltage and the voltage on the direct-current bus meet a predetermined condition, determining that the three-phase alternating-current power supply does not have a phase failure, including:
when determining VPN∈[(1-α)Vj*31/2*21/2，(1+α)Vj*31/2*21/2]When the three-phase alternating current power supply is in phase failure, determining that the three-phase alternating current power supply is not in phase failure, wherein the voltage V is not less than 0 and is not more than α and less than 1PNIs the voltage on the DC bus, Vj＝VL1＝VL2＝VL3，VL1Is the filtered L1 AC bus voltage, VL2Is the filtered L2 AC bus voltage, VL3Is the filtered L3 ac bus voltage.
2. The method of claim 1,
and if the three-phase alternating current power supply is determined to be in phase failure, obtaining the filtered alternating current bus current, and determining the alternating current bus in phase failure according to the filtered alternating current bus current.
3. The utility model provides a three-phase electric detection device, is applied to among the AC-DC conversion circuit, wherein the AC-DC conversion circuit includes wave filter, rectifier, the input of wave filter is connected and is exchanged the generating line, the input of rectifier is connected to the output of wave filter, direct current generating line is connected to the output of rectifier, it includes to exchange the generating line: an L1 alternating current bus, an L2 alternating current bus, and an L3 alternating current bus; the three-phase alternating current power supply is input into the filter through an alternating current bus; it is characterized by comprising:
the detection unit is used for detecting the filtered alternating current bus voltage at the output end of the filter and the voltage on the direct current bus;
the processing unit is configured to determine that the three-phase ac power supply does not have a phase failure when it is determined that the filtered ac bus voltage detected by the detecting unit and the voltage on the dc bus satisfy a predetermined condition, and specifically configured to: when determining VPN∈[(1-α)Vj*31/2*21/2，(1+α)Vj*31/2*21/2]When the three-phase alternating current power supply is in phase failure, determining that the three-phase alternating current power supply is not in phase failure, wherein the voltage V is not less than 0 and is not more than α and less than 1PNIs the voltage on the DC bus, Vj＝VL1＝VL2＝VL3，VL1Is the filtered L1 AC bus voltage, VL2Is the filtered L2 AC bus voltage, VL3Is the filtered L3 ac bus voltage.
4. The apparatus of claim 3,
and the processing unit is further used for acquiring the filtered alternating current bus current through the detection unit if the three-phase alternating current power supply is determined to be in phase failure, and determining the alternating current bus in phase failure according to the filtered alternating current bus current.
5. A three-phase electrical detection apparatus, comprising: an interface, a processor, a memory, a bus; the memory is used for storing computer-executable instructions, the processor is connected with the memory through the bus, and when the three-phase electric detection device is operated, the processor executes the computer-executable instructions stored in the memory so as to enable the three-phase electric detection device to execute the method according to any one of claims 1-2.
6. A computer storage medium comprising instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1-2.
7. The utility model provides an air condensing units, its characterized in that, includes alternating current-direct current converting circuit, compressor converter and fan motor converter, alternating current-direct current converting circuit is used for supplying power to compressor converter and fan motor converter, still includes: the three-phase electric detection device as claimed in any one of claims 3 to 5, which is connected to a drive circuit of the compressor inverter and a drive circuit of the fan motor inverter;
when the three-phase electric detection device determines that the three-phase alternating-current power supply is not in phase failure, outputting a first control signal to a driving circuit of the compressor frequency converter, so that the driving circuit of the compressor frequency converter drives the compressor frequency converter to output driving voltage to the compressor according to the first control signal;
and outputting a second control signal to a driving circuit of the fan motor frequency converter, so that the driving circuit of the fan motor frequency converter drives the fan motor frequency converter to output driving voltage to the fan motor according to the second control signal.
8. The outdoor unit of claim 7, wherein,
when the three-phase electric detection device determines that the three-phase alternating-current power supply is in phase loss, the three-phase electric detection device is also used for outputting a third control signal to the driving circuit of the compressor frequency converter, so that the driving circuit of the compressor frequency converter stops the compressor frequency converter from outputting driving voltage to the compressor according to the third control signal;
and outputting a fourth control signal to a driving circuit of the fan motor frequency converter, so that the driving circuit of the fan motor frequency converter stops outputting a driving voltage to the fan motor by the fan motor frequency converter according to the fourth control signal.
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| CN109194245B (en) * | 2018-11-16 | 2023-11-10 | 广东科伺智能科技有限公司 | Servo driver with input open-phase detection function and detection method thereof |
| CN112290510B (en) * | 2020-11-06 | 2023-02-24 | 广东电网有限责任公司佛山供电局 | Motor phase loss detection protection system |
| CN113391139B (en) * | 2021-07-30 | 2022-12-27 | 佛山市顺德区美的电子科技有限公司 | Open-phase detection method and device for three-phase power input line and air conditioner outdoor unit |
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