CN111181133A - Overcurrent protection method and device, storage medium and air conditioner - Google Patents
Overcurrent protection method and device, storage medium and air conditioner Download PDFInfo
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- CN111181133A CN111181133A CN202010021967.3A CN202010021967A CN111181133A CN 111181133 A CN111181133 A CN 111181133A CN 202010021967 A CN202010021967 A CN 202010021967A CN 111181133 A CN111181133 A CN 111181133A
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- radar
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16585—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 for individual pulses, ripple or noise and other applications where timing or duration is of importance
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
Abstract
The invention discloses an overcurrent protection method, an overcurrent protection device, a storage medium and an air conditioner, wherein the method comprises the following steps: detecting a power line of a compressor of the air conditioner through a radar with a set wavelength, and detecting current flowing through the compressor of the air conditioner to obtain the current flowing through the compressor; determining whether the current flowing through the compressor is greater than a set over-current protection value; if the current flowing through the compressor is larger than the set overcurrent protection value, determining that the current flowing through the compressor has an overcurrent phenomenon, and generating an overcurrent protection instruction; and starting a set overcurrent protection mechanism according to the generated overcurrent protection instruction so as to realize overcurrent protection of the air conditioner. According to the scheme, the problem that the overcurrent protection reliability is poor when the current transformer is required to detect the current flowing through the compressor in the overcurrent protection of the air conditioner can be solved, and the effect of improving the overcurrent protection reliability is achieved.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an overcurrent protection method and device, a storage medium and an air conditioner, in particular to a control method and device for detecting current by a millimeter wave radar, the storage medium and the air conditioner.
Background
Since the current intensity (current for short) is the amount of electricity passing through any cross section of a conductor per unit time, the more electricity passing through a certain cross section per unit time, the larger the current.
In the aspect of current detection, a current transformer can be used for detecting current, but the detection accuracy cannot be guaranteed. If the overcurrent protection can be realized by detecting the current flowing through the compressor on the air conditioner, if the detection accuracy of the current cannot be guaranteed, the accuracy of the overcurrent protection of the air conditioner cannot be guaranteed, and the overcurrent protection of the air conditioner cannot be avoided, so that the error protection can be realized.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention aims to provide an overcurrent protection method, an overcurrent protection device, a storage medium and an air conditioner, aiming at overcoming the defects that a current transformer is required to detect the current flowing through a compressor in the overcurrent protection of the air conditioner, the current detection accuracy cannot be guaranteed, so that the error protection is difficult to avoid, and the reliability of the overcurrent protection is poor, so that the effects of avoiding the error protection caused by the failure in the accuracy of the current detection and improving the reliability of the overcurrent protection are achieved.
The invention provides an overcurrent protection method, which comprises the following steps: detecting a power line of a compressor of the air conditioner through a radar with a set wavelength, and detecting current flowing through the compressor of the air conditioner to obtain the current flowing through the compressor; determining whether the current flowing through the compressor is greater than a set over-current protection value; if the current flowing through the compressor is larger than the set overcurrent protection value, determining that the current flowing through the compressor has an overcurrent phenomenon, and generating an overcurrent protection instruction; and starting a set overcurrent protection mechanism according to the generated overcurrent protection instruction so as to realize overcurrent protection of the air conditioner.
Optionally, wherein the radar for setting the wavelength includes: a millimeter wave radar, a microwave radar, or a photoelectric radar.
Optionally, detecting a power line of a compressor of the air conditioner by a radar of a set wavelength, and detecting a current flowing through the compressor of the air conditioner, includes: determining a signal attenuation value of a feedback signal of a radar with a set wavelength after a transmitting signal passes through a power line of a compressor; a signal attenuation value between a radar signal with a set wavelength and a feedback signal based on the radar signal with the set wavelength is subjected to data conversion processing to obtain a current flowing through a power supply line of the compressor as a current flowing through the compressor.
Optionally, determining a signal attenuation value of a feedback signal of the radar of the set wavelength after the transmission signal passes through a power line of the compressor comprises: transmitting a radar signal with a set wavelength to a power line of the compressor by using a radar with a set wavelength; after the set time length, receiving a feedback signal of a power line of the compressor based on a radar signal with a set wavelength; and determining a signal difference value between the radar signal with the set wavelength and a feedback signal based on the radar signal with the set wavelength, and taking the signal difference value as a signal attenuation value between the radar signal with the set wavelength and the feedback signal based on the radar signal with the set wavelength to obtain a signal attenuation value of the feedback signal after the transmission signal of the radar with the set wavelength passes through a power line of the compressor.
Optionally, the data conversion processing is performed on a signal attenuation value between the radar signal with the set wavelength and a feedback signal based on the radar signal with the set wavelength, and includes: calculating and amplifying a signal attenuation value between a radar signal with a set wavelength and a feedback signal based on the radar signal with the set wavelength to obtain a first processing result; and performing data coupling processing on the first processing result to obtain a second processing result as the current flowing through the compressor.
In another aspect, the present invention provides an overcurrent protection apparatus, including: the detection unit is used for detecting a power line of a compressor of the air conditioner through a radar with a set wavelength and detecting current flowing through the compressor of the air conditioner so as to obtain the current flowing through the compressor; a determining unit for determining whether a current flowing through the compressor is greater than a set overcurrent protection value; the determining unit is also used for determining that the current flowing through the compressor has an overcurrent phenomenon and generating an overcurrent protection instruction if the current flowing through the compressor is greater than a set overcurrent protection value; and the control unit is used for starting a set over-current protection mechanism according to the generated over-current protection instruction so as to realize over-current protection of the air conditioner.
Optionally, wherein the radar for setting the wavelength includes: a millimeter wave radar, a microwave radar, or a photoelectric radar.
Alternatively, the detection unit detects a power line of a compressor of the air conditioner through a radar of a set wavelength, and detects a current flowing through the compressor of the air conditioner, including: determining a signal attenuation value of a feedback signal of a radar with a set wavelength after a transmitting signal passes through a power line of a compressor; a signal attenuation value between a radar signal with a set wavelength and a feedback signal based on the radar signal with the set wavelength is subjected to data conversion processing to obtain a current flowing through a power supply line of the compressor as a current flowing through the compressor.
Optionally, the detecting unit determines a signal attenuation value of a feedback signal after a transmission signal of the radar of the set wavelength passes through a power line of the compressor, and includes: transmitting a radar signal with a set wavelength to a power line of the compressor by using a radar with a set wavelength; after the set time length, receiving a feedback signal of a power line of the compressor based on a radar signal with a set wavelength; and determining a signal difference value between the radar signal with the set wavelength and a feedback signal based on the radar signal with the set wavelength, and taking the signal difference value as a signal attenuation value between the radar signal with the set wavelength and the feedback signal based on the radar signal with the set wavelength to obtain a signal attenuation value of the feedback signal after the transmission signal of the radar with the set wavelength passes through a power line of the compressor.
Optionally, the detecting unit performs data conversion processing on a signal attenuation value between the radar signal with the set wavelength and a feedback signal based on the radar signal with the set wavelength, and includes: calculating and amplifying a signal attenuation value between a radar signal with a set wavelength and a feedback signal based on the radar signal with the set wavelength to obtain a first processing result; and performing data coupling processing on the first processing result to obtain a second processing result as the current flowing through the compressor.
In accordance with another aspect of the present invention, there is provided an air conditioner including: the overcurrent protection device is described above.
In accordance with the above method, a further aspect of the present invention provides a storage medium comprising: the storage medium has stored therein a plurality of instructions; the instructions are used for loading and executing the overcurrent protection method by the processor.
In accordance with the above method, another aspect of the present invention provides an air conditioner, comprising: a processor for executing a plurality of instructions; a memory to store a plurality of instructions; the instructions are used for being stored by the memory, and being loaded and executed by the processor.
According to the scheme, the millimeter wave radar is adopted to detect the current flowing through the compressor of the air conditioner, and then the compressor is subjected to overcurrent protection control according to the detected current, so that the current of the air conditioner compressor is accurately detected in space, and the problem of mistaken reporting of overcurrent protection is reduced.
Furthermore, according to the scheme of the invention, the millimeter wave radar is adopted to detect the current flowing through the compressor of the air conditioner, and then the overcurrent protection control is carried out on the compressor according to the detected current, so that the current of the compressor can be accurately detected, and the problem of false alarm and overcurrent faults of the compressor caused by large errors of the current transformer is reduced.
Further, according to the scheme of the invention, the millimeter wave radar is adopted to detect the current flowing through the compressor of the air conditioner, and then the overcurrent protection control is carried out on the compressor according to the detected current, so that the current of the compressor can be accurately detected, and the after-sale faults of the main control board are reduced.
Furthermore, according to the scheme of the invention, the millimeter wave radar is adopted to detect the current flowing through the compressor of the air conditioner, and then the overcurrent protection control is carried out on the compressor according to the detected current, so that circuit components arranged for sampling the current flowing through the compressor can be reduced, and the hardware cost can be reduced.
Furthermore, according to the scheme of the invention, the millimeter wave radar is adopted to detect the current flowing through the compressor of the air conditioner, and then the compressor is subjected to overcurrent protection control according to the detected current, so that the detection accuracy of the current flowing through the compressor can be improved, the accuracy and the reliability of the overcurrent protection control based on the current are improved, the reliability of the operation of the air conditioner is favorably improved, and the user experience is good.
Therefore, according to the scheme of the invention, the current flowing through the compressor of the air conditioner is detected by adopting the millimeter wave radar, and then the overcurrent protection control is carried out on the compressor according to the detected current, so that the problems that the current flowing through the compressor needs to be detected by adopting the current transformer in the overcurrent protection of the air conditioner, the error protection is difficult to avoid because the accuracy of the current detection cannot be ensured, and the reliability of the overcurrent protection is poor are solved, and the effects of avoiding the error protection because the accuracy of the current detection cannot be ensured and improving the reliability of the overcurrent protection are achieved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic flow chart diagram illustrating an embodiment of an over-current protection method according to the present invention;
FIG. 2 is a schematic flow chart illustrating one embodiment of detecting current flowing through a compressor of an air conditioner in the method of the present invention;
FIG. 3 is a schematic flow chart illustrating an embodiment of the method for determining the signal attenuation value of the feedback signal after the transmitting signal of the radar with the set wavelength passes through the power line of the compressor;
FIG. 4 is a flowchart illustrating an embodiment of a data conversion process for signal attenuation values between a radar signal with a set wavelength and a feedback signal based on the radar signal with the set wavelength according to the method of the present invention;
fig. 5 is a schematic structural diagram of an embodiment of an overcurrent protection apparatus according to the invention;
fig. 6 is a schematic flow chart illustrating a process of analyzing and detecting a compressor current by a millimeter wave radar according to an embodiment of the air conditioner of the present invention.
The reference numbers in the embodiments of the present invention are as follows, in combination with the accompanying drawings:
102-a detection unit; 104-a determination unit; 106-control unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
According to an embodiment of the present invention, an overcurrent protection method is provided, as shown in fig. 1, which is a schematic flow chart of an embodiment of the method of the present invention. The overcurrent protection method can be applied to an air conditioner which can detect the current flowing through a compressor by using a radar with a set wavelength, and can comprise the following steps: step S110 to step S140.
And step S110, detecting a power line of a compressor of the air conditioner through the radar with the set wavelength, and detecting the current flowing through the compressor of the air conditioner to obtain the current flowing through the compressor.
The radar with the set wavelength may include: a millimeter wave radar, a microwave radar, or a photoelectric radar.
For example: the millimeter wave radar is directly utilized to detect the current and send the current to the main chip for processing, so that the current transformers and related overcurrent circuit components on the main control board can be reduced, the size of the main control PCB board is reduced, and the cost is reduced; the after-sale faults of the main control board are reduced; the current of the compressor can be accurately detected, and the problem of false alarm and overcurrent faults of the compressor caused by large errors of the current transformer is reduced.
Therefore, the radar with various wavelengths can be suitable for various current testing occasions, and has the advantages of wide application range and flexible and convenient use mode.
Alternatively, a specific process of detecting a power line of a compressor of the air conditioner by a radar of a set wavelength and detecting a current flowing through the compressor of the air conditioner in step S110 may be referred to as the following exemplary description.
The following further describes a specific process of detecting the current flowing through the compressor of the air conditioner in step S110 with reference to a flowchart of an embodiment of detecting the current flowing through the compressor of the air conditioner in the method of the present invention shown in fig. 2, which may include: step S210 and step S220.
In step S210, a signal attenuation value of a feedback signal after a transmission signal of the radar of a set wavelength passes through a power line of the compressor is determined.
More alternatively, a specific process of determining the signal attenuation value of the feedback signal after the transmission signal of the radar with the set wavelength passes through the power line of the compressor in step S210 may be referred to as the following exemplary description.
The following may further describe, with reference to a flowchart of an embodiment of determining a signal attenuation value of the feedback signal after the transmission signal of the radar with the set wavelength passes through the power line of the compressor in the method shown in fig. 3, a specific process of determining the signal attenuation value of the feedback signal after the transmission signal of the radar with the set wavelength passes through the power line of the compressor in step S210 may include: step S310 to step S330.
Step S310, utilizing the radar with the set wavelength to emit a radar signal with the set wavelength to a power line of the compressor.
For example: a millimeter wave radar integrated circuit may be provided on the main control panel of the air conditioner. The millimeter wave radar integrated circuit may include: radar signal transmitting antennas, etc. And transmitting the radar signal with the set wavelength to a power line of the compressor by using a radar signal transmitting antenna of the radar with the set wavelength. If the air conditioner normally operates, the millimeter wave radar transmitting antenna transmits a millimeter wave radar signal to a power line of the air conditioner compressor, and the electric quantity (namely current) flowing through the cross section area of the power line in unit time is detected.
Step S320, after the set duration, receiving a feedback signal of the power line of the compressor based on the radar signal with the set wavelength.
For example: a millimeter wave radar integrated circuit may be provided on the main control panel of the air conditioner. The millimeter wave radar integrated circuit may include: a radar signal transmitting antenna, a signal receiving circuit and the like. And transmitting the radar signal with the set wavelength to a power line of the compressor by using a radar signal transmitting antenna of the radar with the set wavelength. After the set time length, a signal receiving circuit of the radar with the set wavelength is used for receiving a feedback signal of a power line of the compressor based on the radar signal with the set wavelength.
And step S330, determining a signal difference value between the radar signal with the set wavelength and a feedback signal based on the radar signal with the set wavelength, and taking the signal difference value as a signal attenuation value between the radar signal with the set wavelength and the feedback signal based on the radar signal with the set wavelength to obtain a signal attenuation value of the feedback signal after the transmission signal of the radar with the set wavelength passes through a power line of the compressor.
For example: a millimeter wave radar integrated circuit may be provided on the main control panel of the air conditioner. The millimeter wave radar integrated circuit may include: the radar signal processing device comprises a radar signal transmitting antenna, a signal receiving circuit, a millimeter wave radar signal processing module and the like. The millimeter wave radar signal processing module is used for determining a signal difference value between a radar signal with a set wavelength and a feedback signal based on the radar signal with the set wavelength, and using the signal difference value as a signal attenuation value between the radar signal with the set wavelength and the feedback signal based on the radar signal with the set wavelength to obtain a signal attenuation value of the feedback signal after a transmitting signal of the radar with the set wavelength passes through a power line of the compressor; further, a signal attenuation value between the radar signal of the set wavelength and a feedback signal based on the radar signal of the set wavelength is subjected to data conversion processing to obtain a current flowing through a power supply line of the compressor, and the current flowing through the power supply line of the compressor is regarded as the current flowing through the compressor.
For example: and the main control chip preprocesses the current value. The larger the current is, the more the millimeter wave radar signal is attenuated, the fewer the signals fed back to the main control board are, the larger the comparison difference value of the transmission and the reception of the millimeter wave radar is, for example, 1A current, and the comparison difference value is 5 (transmission 100 and reception 95); 2A current, contrast difference 10 (transmit 100, receive 90); 3A current, contrast difference 14 (transmit 100, receive 86), etc. And the main control determines the current according to the comparison difference value and the preprocessed value.
Therefore, the signal difference value of the transmitting signal and the feedback signal of the radar with the set wavelength is used as the signal attenuation value of the transmitting signal and the feedback signal, so that the signal attenuation value of the transmitting signal and the feedback signal of the radar with the set wavelength can be conveniently and accurately determined.
In step S220, a signal attenuation value between the radar signal having the set wavelength and the feedback signal based on the radar signal having the set wavelength is subjected to data conversion processing to obtain a current flowing through a power supply line of the compressor, and the current flowing through the power supply line of the compressor is regarded as a current flowing through the compressor.
Therefore, the current flowing through the compressor is determined based on the signal attenuation value between the emission signal and the feedback signal of the radar with the set wavelength, so that the determination of the current flowing through the compressor is more accurate, and the determination method is simpler and more convenient.
More alternatively, in step S220, a specific procedure of data conversion processing is performed on a signal attenuation value between the radar signal with the set wavelength and the feedback signal based on the radar signal with the set wavelength, which may be referred to as the following exemplary description.
With reference to the flowchart of fig. 4, the specific process of performing data conversion processing on the signal attenuation value between the radar signal with the set wavelength and the feedback signal based on the radar signal with the set wavelength in step S310 is further described, where the specific process includes: step S410 and step S420.
In step S410, a signal attenuation value between the radar signal with the set wavelength and the feedback signal based on the radar signal with the set wavelength is calculated and amplified to obtain a first processing result.
Step S420, performing data coupling processing on the first processing result to obtain a second processing result, and using the second processing result as the current flowing through the compressor.
For example: the millimeter wave radar signal processing module processes the emitted radar signals into digital signals through an operational amplifier, a coupler and the like, and provides the digital signals to the air conditioner main control, and the air conditioner main control records the digital signal values. The more the millimeter wave radar signals are attenuated, the millimeter wave radar receives the millimeter wave radar signals fed back, and the millimeter wave radar information processing module processes the received signals into digital signal values and provides the digital signal values for the air conditioner main control panel.
Therefore, the corresponding current value is obtained by carrying out operation amplification and coupling processing on the signal attenuation value between the transmitting signal and the feedback signal of the radar with the set wavelength, so that on one hand, the current flowing through the compressor can be definitely obtained, on the other hand, comparison and judgment can be conveniently carried out during overcurrent protection, and the accuracy and convenience of overcurrent protection can be favorably improved.
Step S120, it is determined whether the current flowing through the compressor is greater than a set overcurrent protection value.
And step S130, if the current flowing through the compressor is greater than the set overcurrent protection value, determining that the current flowing through the compressor has an overcurrent phenomenon, and generating an overcurrent protection instruction.
And step S140, starting a set over-current protection mechanism according to the generated over-current protection instruction so as to realize over-current protection of the air conditioner. For example: and the air conditioner main control board compares the signal value transmitted by the millimeter wave radar with the received signal value to obtain a difference value, and if the difference value is basically the same as a certain pre-processed current value, the current value flowing through the air conditioner compressor is judged. The air conditioner main control board can convert a comparison value (such as a difference value obtained by comparing a signal value transmitted by a millimeter wave radar with a received signal value) into a current value, determine the current value flowing through the air conditioner compressor by using the current value, and control, judge and execute related functions according to the current value, if the current flowing through the compressor is judged to be large and exceeds the protection current value of the compressor, execute the overcurrent protection function of the compressor, send overcurrent protection to the main control, and prompt overcurrent protection faults and the like by the main control.
For example: the characteristics of high spatial resolution and high precision of the millimeter wave radar can be utilized, the current flowing through the compressor is detected on the air conditioner, the space accurate detection of the current of the air conditioner compressor is realized, and the problem of false alarm and overcurrent protection is reduced. If design out novel millimeter wave radar detection air conditioner for detect compressor current, can reduce design cost, manufacturing cost etc. also can reduce after-sale fault rate simultaneously, improve the quality of air conditioner product.
For example: the millimeter wave radar integrated circuit is added in the main control board, so that the millimeter wave radar integrated circuit can be used for detecting millimeter wave radar signals, the purpose of monitoring the current of the air conditioner compressor is achieved, and the millimeter wave radar signals are transmitted to the air conditioner main control board, the air conditioner main control board judges whether the current of the compressor is too high or not according to the received millimeter wave radar signal information, and whether the main control board needs to execute relevant operations such as shutdown of the compressor and reporting of relevant overcurrent protection faults by the air conditioner or not.
Therefore, the current flowing through the compressor of the air conditioner is detected by the radar with the set wavelength, so that the overcurrent protection of the air conditioner is realized, and the accuracy of the current flowing through the compressor, which is obtained by the radar with the set wavelength, is good, so that the accuracy of the overcurrent protection of the air conditioner can be ensured, and the safety of the overcurrent protection can be improved.
Through a large amount of tests verification, adopt the technical scheme of this embodiment, through adopting the millimeter wave radar to detect the electric current that flows through the compressor of air conditioner, and then carry out overcurrent protection control to the compressor according to the electric current that detects, realize that space accurate detection air conditioner compressor electric current reduces the mistake and reports overcurrent protection problem.
According to the embodiment of the invention, the invention further provides an overcurrent protection device corresponding to the overcurrent protection method. Referring to fig. 5, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The overcurrent protection device can be applied to an air conditioner which can detect the current flowing through a compressor by using a radar with a set wavelength, and can comprise: a detection unit 102, a determination unit 104 and a control unit 106.
In an alternative example, the detecting unit 102 may be configured to detect a power line of a compressor of an air conditioner through a radar with a set wavelength, and detect a current flowing through the compressor of the air conditioner to obtain the current flowing through the compressor. The specific function and processing of the detection unit 102 are shown in step S110.
The radar with the set wavelength may include: a millimeter wave radar, a microwave radar, or a photoelectric radar.
For example: the millimeter wave radar is directly utilized to detect the current and send the current to the main chip for processing, so that the current transformers and related overcurrent circuit components on the main control board can be reduced, the size of the main control PCB board is reduced, and the cost is reduced; the after-sale faults of the main control board are reduced; the current of the compressor can be accurately detected, and the problem of false alarm and overcurrent faults of the compressor caused by large errors of the current transformer is reduced.
Therefore, the radar with various wavelengths can be suitable for various current testing occasions, and has the advantages of wide application range and flexible and convenient use mode.
Alternatively, the detecting unit 102 detects a power line of a compressor of the air conditioner through a radar of a set wavelength, and detects a current flowing through the compressor of the air conditioner, and may include:
the detection unit 102 may be further configured to determine a signal attenuation value of a feedback signal after a transmission signal of the radar with the set wavelength passes through a power line of the compressor. The specific function and processing of the detection unit 102 are also referred to in step S210.
More optionally, the determining unit 102 may determine a signal attenuation value of a feedback signal after the transmission signal of the radar with the set wavelength passes through a power line of the compressor, and may include:
the detecting unit 102 may be further configured to transmit a radar signal with a set wavelength to a power line of the compressor by using a radar with a set wavelength. The specific function and processing of the detection unit 102 are also referred to in step S310.
For example: a millimeter wave radar integrated circuit may be provided on the main control panel of the air conditioner. The millimeter wave radar integrated circuit may include: radar signal transmitting antennas, etc. And transmitting the radar signal with the set wavelength to a power line of the compressor by using a radar signal transmitting antenna of the radar with the set wavelength. If the air conditioner normally operates, the millimeter wave radar transmitting antenna transmits a millimeter wave radar signal to a power line of the air conditioner compressor, and the electric quantity (namely current) flowing through the cross section area of the power line in unit time is detected.
The detecting unit 102 may be further specifically configured to receive a feedback signal of the power line of the compressor based on the radar signal with the set wavelength after the set time period. The specific function and processing of the detection unit 102 are also referred to in step S320.
For example: a millimeter wave radar integrated circuit may be provided on the main control panel of the air conditioner. The millimeter wave radar integrated circuit may include: a radar signal transmitting antenna, a signal receiving circuit and the like. And transmitting the radar signal with the set wavelength to a power line of the compressor by using a radar signal transmitting antenna of the radar with the set wavelength. After the set time length, a signal receiving circuit of the radar with the set wavelength is used for receiving a feedback signal of a power line of the compressor based on the radar signal with the set wavelength.
The detecting unit 102 may be further configured to determine a signal difference between the radar signal with the set wavelength and the feedback signal based on the radar signal with the set wavelength, and use the signal difference as a signal attenuation value between the radar signal with the set wavelength and the feedback signal based on the radar signal with the set wavelength to obtain a signal attenuation value of the feedback signal after the transmission signal of the radar with the set wavelength passes through the power line of the compressor. The specific function and processing of the detection unit 102 are also referred to in step S330.
For example: a millimeter wave radar integrated circuit may be provided on the main control panel of the air conditioner. The millimeter wave radar integrated circuit may include: the radar signal processing device comprises a radar signal transmitting antenna, a signal receiving circuit, a millimeter wave radar signal processing module and the like. The millimeter wave radar signal processing module is used for determining a signal difference value between a radar signal with a set wavelength and a feedback signal based on the radar signal with the set wavelength, and using the signal difference value as a signal attenuation value between the radar signal with the set wavelength and the feedback signal based on the radar signal with the set wavelength to obtain a signal attenuation value of the feedback signal after a transmitting signal of the radar with the set wavelength passes through a power line of the compressor; further, a signal attenuation value between the radar signal of the set wavelength and a feedback signal based on the radar signal of the set wavelength is subjected to data conversion processing to obtain a current flowing through a power supply line of the compressor, and the current flowing through the power supply line of the compressor is regarded as the current flowing through the compressor.
For example: and the main control chip preprocesses the current value. The larger the current is, the more the millimeter wave radar signal is attenuated, the fewer the signals fed back to the main control board are, the larger the comparison difference value of the transmission and the reception of the millimeter wave radar is, for example, 1A current, and the comparison difference value is 5 (transmission 100 and reception 95); 2A current, contrast difference 10 (transmit 100, receive 90); 3A current, contrast difference 14 (transmit 100, receive 86), etc. And the main control determines the current according to the comparison difference value and the preprocessed value.
Therefore, the signal difference value of the transmitting signal and the feedback signal of the radar with the set wavelength is used as the signal attenuation value of the transmitting signal and the feedback signal, so that the signal attenuation value of the transmitting signal and the feedback signal of the radar with the set wavelength can be conveniently and accurately determined.
The detection unit 102 may be further configured to perform data conversion processing on a signal attenuation value between the radar signal with the set wavelength and a feedback signal based on the radar signal with the set wavelength to obtain a current flowing through a power line of the compressor, and use the current flowing through the power line of the compressor as the current flowing through the compressor. The specific function and processing of the detection unit 102 are also referred to in step S220.
Therefore, the current flowing through the compressor is determined based on the signal attenuation value between the emission signal and the feedback signal of the radar with the set wavelength, so that the determination of the current flowing through the compressor is more accurate, and the determination method is simpler and more convenient.
More alternatively, the detection unit 102 may perform data conversion processing on a signal attenuation value between the radar signal with the set wavelength and a feedback signal based on the radar signal with the set wavelength, and may include:
the detection unit 102 may be further configured to perform calculation and amplification processing on a signal attenuation value between the radar signal with the set wavelength and a feedback signal based on the radar signal with the set wavelength to obtain a first processing result. The specific function and processing of the detection unit 102 are also referred to in step S410.
The detecting unit 102 may be further configured to perform data coupling processing on the first processing result to obtain a second processing result, and use the second processing result as the current flowing through the compressor. The specific function and processing of the detection unit 102 are also referred to in step S420.
For example: the millimeter wave radar signal processing module processes the emitted radar signals into digital signals through an operational amplifier, a coupler and the like, and provides the digital signals to the air conditioner main control, and the air conditioner main control records the digital signal values. The more the millimeter wave radar signals are attenuated, the millimeter wave radar receives the millimeter wave radar signals fed back, and the millimeter wave radar information processing module processes the received signals into digital signal values and provides the digital signal values for the air conditioner main control panel.
Therefore, the corresponding current value is obtained by carrying out operation amplification and coupling processing on the signal attenuation value between the transmitting signal and the feedback signal of the radar with the set wavelength, so that on one hand, the current flowing through the compressor can be definitely obtained, on the other hand, comparison and judgment can be conveniently carried out during overcurrent protection, and the accuracy and convenience of overcurrent protection can be favorably improved.
In an alternative example, the determination unit 104 may be configured to determine whether the current flowing through the compressor is greater than a set over-current protection value. The specific function and processing of the determination unit 104 are referred to in step S120.
In an optional example, the determining unit 104 may be further configured to determine that an overcurrent phenomenon occurs in the current flowing through the compressor and generate an overcurrent protection command if the current flowing through the compressor is greater than a set overcurrent protection value. The specific function and processing of the determination unit 104 are also referred to in step S130.
In an optional example, the control unit 106 may be configured to start a set over-current protection mechanism according to the generated over-current protection instruction, so as to implement over-current protection on the air conditioner. The specific function and processing of the control unit 106 are shown in step S140. For example: and the air conditioner main control board compares the signal value transmitted by the millimeter wave radar with the received signal value to obtain a difference value, and if the difference value is basically the same as a certain pre-processed current value, the current value flowing through the air conditioner compressor is judged. The air conditioner main control board can convert a comparison value (such as a difference value obtained by comparing a signal value transmitted by a millimeter wave radar with a received signal value) into a current value, determine the current value flowing through the air conditioner compressor by using the current value, and control, judge and execute related functions according to the current value, if the current flowing through the compressor is judged to be large and exceeds the protection current value of the compressor, execute the overcurrent protection function of the compressor, send overcurrent protection to the main control, and prompt overcurrent protection faults and the like by the main control.
For example: the characteristics of high spatial resolution and high precision of the millimeter wave radar can be utilized, the current flowing through the compressor is detected on the air conditioner, the space accurate detection of the current of the air conditioner compressor is realized, and the problem of false alarm and overcurrent protection is reduced. If design out novel millimeter wave radar detection air conditioner for detect compressor current, can reduce design cost, manufacturing cost etc. also can reduce after-sale fault rate simultaneously, improve the quality of air conditioner product.
For example: the millimeter wave radar integrated circuit is added in the main control board, so that the millimeter wave radar integrated circuit can be used for detecting millimeter wave radar signals, the purpose of monitoring the current of the air conditioner compressor is achieved, and the millimeter wave radar signals are transmitted to the air conditioner main control board, the air conditioner main control board judges whether the current of the compressor is too high or not according to the received millimeter wave radar signal information, and whether the main control board needs to execute relevant operations such as shutdown of the compressor and reporting of relevant overcurrent protection faults by the air conditioner or not.
Therefore, the current flowing through the compressor of the air conditioner is detected by the radar with the set wavelength, so that the overcurrent protection of the air conditioner is realized, and the accuracy of the current flowing through the compressor, which is obtained by the radar with the set wavelength, is good, so that the accuracy of the overcurrent protection of the air conditioner can be ensured, and the safety of the overcurrent protection can be improved.
Since the processes and functions implemented by the apparatus of this embodiment substantially correspond to the embodiments, principles and examples of the method shown in fig. 1 to 4, the description of this embodiment is not detailed, and reference may be made to the related descriptions in the foregoing embodiments, which are not repeated herein.
Through a large number of tests, the technical scheme of the invention is adopted, the current flowing through the compressor of the air conditioner is detected by adopting the millimeter wave radar, and then the overcurrent protection control is carried out on the compressor according to the detected current, so that the current of the compressor can be accurately detected, and the problem of false alarm and overcurrent faults of the compressor caused by large errors of the current transformer is reduced.
According to the embodiment of the invention, an air conditioner corresponding to the overcurrent protection device is also provided. The air conditioner may include: the overcurrent protection device is described above.
The air conditioner can use current transformer to detect the current that flows through the compressor, need walk the line space for current transformer design on the main control board, increases the relevant components and parts that overcurrent protection circuit such as current transformer, resistance, electric capacity used, still need pass current transformer with the compressor live wire during the production air conditioner simultaneously, so can cost design cost, production man-hour cost etc. by a lot.
Millimeter wave radars are radars that operate in the millimeter wave band (millimeter wave) for detection. Usually, the millimeter wave is in the frequency domain of 30 to 300GHz (with a wavelength of 1 to 10 mm). Millimeter-wave radar has some of the advantages of both microwave and photoelectric radar because the wavelength of millimeter-wave waves is intermediate between microwave and centimeter waves. The millimeter wave radar has narrower wave beams (generally in milliradian magnitude), has the characteristics of strong penetration capability, high spatial resolution and high precision, is favorable for resisting electronic interference and clutter interference, and has great significance in the aspects of communication, radar, guidance, remote sensing technology, radio astronomy and wave spectroscopy.
Considering that if a novel millimeter wave radar detection air conditioner is designed according to the characteristics of high spatial resolution and high precision of the millimeter wave radar, the millimeter wave radar detection air conditioner is used for detecting the current of a compressor, the design cost, the production cost and the like can be reduced, the after-sale failure rate can be reduced, and the quality of air conditioner products is improved. Specifically, the characteristics of millimeter waves can be utilized, the current flowing through the compressor can be detected on the air conditioner, the space precision detection of the current of the air conditioner compressor is realized, and the problem of false alarm and overcurrent protection is reduced.
In an alternative example, the invention provides an air conditioner for detecting current by using a millimeter wave radar.
In some schemes, a current transformer needs to be installed on a main control panel of the air conditioner, a live wire of a compressor passes through the current transformer, and voltage is sampled according to the current flowing through the transformer and sent to a main chip to judge the current. According to the scheme of the invention, a current transformer is not needed, an additional sampling circuit is not needed, the millimeter wave radar is directly used for detecting the current and sending the current to the main chip for processing, the current transformer and related overcurrent circuit components on the main control board can be reduced, the size of the main control PCB board is reduced, and the cost is reduced; the after-sale faults of the main control board are reduced; the current of the compressor can be accurately detected, and the problem of false alarm and overcurrent faults of the compressor caused by large errors of the current transformer is reduced.
Specifically, in the scheme of the invention, the air conditioner does not need to be provided with a circuit transformer and does not need to thread the live wire of the compressor into the current transformer during production; the millimeter wave radar integrated circuit is added in the main control board and used for detecting millimeter wave radar signals, the purpose of monitoring the current of the air conditioner compressor is achieved, the millimeter wave radar signals are transmitted to the air conditioner main control board, the air conditioner main control board judges whether the current of the compressor is too high or not according to the received millimeter wave radar signal information, and whether the main control board needs to execute relevant operations such as shutdown of the compressor and reporting of relevant overcurrent protection faults by the air conditioner or not is judged.
In an alternative embodiment, reference may be made to the example shown in fig. 6 to illustrate a specific implementation process of the scheme of the present invention.
In an aspect of the present invention, a basic device includes: a compressor of an air conditioner, a main control board and the like, and a millimeter wave radar, a millimeter wave radar detection circuit and the like. Specifically, a millimeter wave radar integrated circuit may be disposed on the main control board of the air conditioner. The millimeter wave radar integrated circuit may include: the radar signal processing device comprises a radar signal transmitting antenna, a signal receiving circuit, a millimeter wave radar signal processing module and the like.
Referring to an example shown in fig. 6, a process of detecting a compressor current of an air conditioner by the millimeter wave radar may include:
step 1, normally operating an air conditioner, transmitting a millimeter wave radar signal to a power line of an air conditioner compressor by a millimeter wave radar transmitting antenna, and detecting electric quantity (namely current) flowing through the cross section area of the power line in unit time; meanwhile, the millimeter wave radar signal processing module processes the emitted radar signals into digital signals through an operational amplifier, a coupler and the like, and provides the digital signals to the air conditioner main control, and the air conditioner main control records the digital signal values.
Here, the more the amount of electricity (i.e., current) flowing through the cross-sectional area of the power line per unit time, the larger the current. The more the millimeter wave radar signal is attenuated, the millimeter wave radar receives the millimeter wave radar signal fed back, and the millimeter wave radar information processing module processes the received signal into a digital signal value and provides the digital signal value for the air conditioner main control panel.
For example: and the main control chip preprocesses the current value. The larger the current is, the more the millimeter wave radar signal is attenuated, the fewer the signals fed back to the main control board are, the larger the comparison difference value of the transmission and the reception of the millimeter wave radar is, for example, 1A current, and the comparison difference value is 5 (transmission 100 and reception 95); 2A current, contrast difference 10 (transmit 100, receive 90); 3A current, contrast difference 14 (transmit 100, receive 86), etc. And the main control determines the current according to the comparison difference value and the preprocessed value.
And 2, preprocessing the air conditioner main control board, and corresponding to different current values according to different digital signal values, such as the difference value of corresponding digital signals of a sending signal and a receiving signal.
Optionally, the air conditioner main control board compares a signal value transmitted by the millimeter wave radar with a received signal value to obtain a difference value, and if the difference value is substantially the same as a certain pre-processed current value, the current value flowing through the air conditioner compressor is determined.
The air conditioner main control board can convert a comparison value (such as a difference value obtained by comparing a signal value transmitted by the millimeter wave radar with a received signal value) into a current value, determine the current value flowing through the air conditioner compressor by using the current value, and control, judge and execute related functions according to the current value, wherein if the current flowing through the compressor is judged to be small, the compressor is not started; and if the current is large and exceeds the protection current value of the compressor, the overcurrent protection function of the compressor is executed, the overcurrent protection is sent to the master control, and the master control prompts overcurrent protection faults and the like. That is to say, the current of the compressor is detected by the millimeter wave radar, and the air conditioner judges what action needs to be performed, such as the starting of the compressor, the protection of the compressor and the like.
Since the processing and functions of the air conditioner of this embodiment are basically corresponding to the embodiments, principles and examples of the apparatus shown in fig. 5, the description of this embodiment is not given in detail, and reference may be made to the related descriptions in the embodiments, which are not described herein again.
Through a large number of tests, the technical scheme of the invention is adopted, the current flowing through the compressor of the air conditioner is detected by adopting the millimeter wave radar, and then the overcurrent protection control is carried out on the compressor according to the detected current, so that the current of the compressor can be accurately detected, and the after-sale faults of the main control board are reduced.
According to the embodiment of the invention, a storage medium corresponding to the overcurrent protection method is also provided. The storage medium may include: the storage medium has stored therein a plurality of instructions; the instructions are used for loading and executing the overcurrent protection method by the processor.
Since the processing and functions implemented by the storage medium of this embodiment substantially correspond to the embodiments, principles, and examples of the methods shown in fig. 1 to fig. 4, details are not described in the description of this embodiment, and reference may be made to the related descriptions in the foregoing embodiments, which are not described herein again.
Through a large number of tests, the technical scheme of the invention detects the current flowing through the compressor of the air conditioner by adopting the millimeter wave radar, and then carries out overcurrent protection control on the compressor according to the detected current, so that circuit components arranged for sampling the current flowing through the compressor can be reduced, and the hardware cost is favorably reduced.
According to the embodiment of the invention, an air conditioner corresponding to the overcurrent protection method is also provided. The air conditioner may include: a processor for executing a plurality of instructions; a memory to store a plurality of instructions; the instructions are used for being stored by the memory, and being loaded and executed by the processor.
Since the processing and functions of the air conditioner of this embodiment are basically corresponding to the embodiments, principles and examples of the methods shown in fig. 1 to 4, the description of this embodiment is not detailed, and reference may be made to the related descriptions in the foregoing embodiments, which are not described herein again.
Through a large number of tests, the technical scheme provided by the invention is adopted, the current flowing through the compressor of the air conditioner is detected by adopting the millimeter wave radar, and then the compressor is subjected to overcurrent protection control according to the detected current, so that the detection accuracy of the current flowing through the compressor can be improved, the accuracy and the reliability of the overcurrent protection control based on the current are improved, the reliability of the operation of the air conditioner is favorably improved, and the user experience is good.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (12)
1. An overcurrent protection method, comprising:
detecting a power line of a compressor of the air conditioner through a radar with a set wavelength, and detecting current flowing through the compressor of the air conditioner to obtain the current flowing through the compressor;
determining whether the current flowing through the compressor is greater than a set over-current protection value;
if the current flowing through the compressor is larger than the set overcurrent protection value, determining that the current flowing through the compressor has an overcurrent phenomenon, and generating an overcurrent protection instruction;
and starting a set overcurrent protection mechanism according to the generated overcurrent protection instruction so as to realize overcurrent protection of the air conditioner.
2. The overcurrent protection method as set forth in claim 1, wherein the wavelength-setting radar comprises: a millimeter wave radar, a microwave radar, or a photoelectric radar.
3. The overcurrent protection method according to claim 1 or 2, wherein detecting a power supply line of a compressor of the air conditioner by a radar of a set wavelength, detecting a current flowing through the compressor of the air conditioner, comprises:
determining a signal attenuation value of a feedback signal of a radar with a set wavelength after a transmitting signal passes through a power line of a compressor;
a signal attenuation value between a radar signal with a set wavelength and a feedback signal based on the radar signal with the set wavelength is subjected to data conversion processing to obtain a current flowing through a power supply line of the compressor as a current flowing through the compressor.
4. The overcurrent protection method as set forth in claim 3, wherein determining a signal attenuation value of a feedback signal of the radar of the set wavelength after the transmission signal passes through a power line of the compressor comprises:
transmitting a radar signal with a set wavelength to a power line of the compressor by using a radar with a set wavelength;
after the set time length, receiving a feedback signal of a power line of the compressor based on a radar signal with a set wavelength;
and determining a signal difference value between the radar signal with the set wavelength and a feedback signal based on the radar signal with the set wavelength, and taking the signal difference value as a signal attenuation value between the radar signal with the set wavelength and the feedback signal based on the radar signal with the set wavelength to obtain a signal attenuation value of the feedback signal after the transmission signal of the radar with the set wavelength passes through a power line of the compressor.
5. The overcurrent protection method according to claim 3, wherein the data conversion processing of the signal attenuation value between the radar signal of the set wavelength and the feedback signal based on the radar signal of the set wavelength includes:
calculating and amplifying a signal attenuation value between a radar signal with a set wavelength and a feedback signal based on the radar signal with the set wavelength to obtain a first processing result;
and performing data coupling processing on the first processing result to obtain a second processing result as the current flowing through the compressor.
6. An overcurrent protection device, comprising: the method comprises the following steps:
the detection unit is used for detecting a power line of a compressor of the air conditioner through a radar with a set wavelength and detecting current flowing through the compressor of the air conditioner so as to obtain the current flowing through the compressor;
a determining unit for determining whether a current flowing through the compressor is greater than a set overcurrent protection value;
the determining unit is also used for determining that the current flowing through the compressor has an overcurrent phenomenon and generating an overcurrent protection instruction if the current flowing through the compressor is greater than a set overcurrent protection value;
and the control unit is used for starting a set over-current protection mechanism according to the generated over-current protection instruction so as to realize over-current protection of the air conditioner.
7. The overcurrent protection device as recited in claim 6, wherein the wavelength-designated radar comprises: a millimeter wave radar, a microwave radar, or a photoelectric radar.
8. The overcurrent protection apparatus according to claim 6 or 7, wherein the detection unit detects a power supply line of a compressor of the air conditioner by a radar of a set wavelength, and detects a current flowing through the compressor of the air conditioner, and includes:
determining a signal attenuation value of a feedback signal of a radar with a set wavelength after a transmitting signal passes through a power line of a compressor;
a signal attenuation value between a radar signal with a set wavelength and a feedback signal based on the radar signal with the set wavelength is subjected to data conversion processing to obtain a current flowing through a power supply line of the compressor as a current flowing through the compressor.
9. The overcurrent protection apparatus according to claim 8, wherein the detecting unit determines a signal attenuation value of a feedback signal after a transmission signal of the radar of the set wavelength passes through a power line of the compressor, and includes:
transmitting a radar signal with a set wavelength to a power line of the compressor by using a radar with a set wavelength;
after the set time length, receiving a feedback signal of a power line of the compressor based on a radar signal with a set wavelength;
and determining a signal difference value between the radar signal with the set wavelength and a feedback signal based on the radar signal with the set wavelength, and taking the signal difference value as a signal attenuation value between the radar signal with the set wavelength and the feedback signal based on the radar signal with the set wavelength to obtain a signal attenuation value of the feedback signal after the transmission signal of the radar with the set wavelength passes through a power line of the compressor.
10. The overcurrent protection apparatus according to claim 8, wherein the detection unit performs data conversion processing on a signal attenuation value between the radar signal of the set wavelength and the feedback signal based on the radar signal of the set wavelength, and includes:
calculating and amplifying a signal attenuation value between a radar signal with a set wavelength and a feedback signal based on the radar signal with the set wavelength to obtain a first processing result;
and performing data coupling processing on the first processing result to obtain a second processing result as the current flowing through the compressor.
11. An air conditioner, comprising: the overcurrent protection arrangement as set forth in any one of claims 6-10;
alternatively, it comprises:
a processor for executing a plurality of instructions;
a memory to store a plurality of instructions;
wherein the plurality of instructions are for being stored by the memory and loaded and executed by the processor to perform the over-current protection method of any one of claims 1 to 5.
12. A storage medium having a plurality of instructions stored therein; the plurality of instructions for being loaded by a processor and for performing the method of overcurrent protection as set forth in any one of claims 1 to 5.
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