CN111256280A - Operation control method and system, compressor and air conditioner - Google Patents
Operation control method and system, compressor and air conditioner Download PDFInfo
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- CN111256280A CN111256280A CN201811460135.0A CN201811460135A CN111256280A CN 111256280 A CN111256280 A CN 111256280A CN 201811460135 A CN201811460135 A CN 201811460135A CN 111256280 A CN111256280 A CN 111256280A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- Air Conditioning Control Device (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention provides an operation control method, an operation control system, a compressor, an air conditioner and a computer readable storage medium, wherein the operation control method is suitable for a power supply control circuit, the power supply control circuit is used for connecting a power supply signal of a bus into the compressor, a power factor correction controller and a main control board which are electrically connected are arranged in the power supply control circuit, the power factor correction controller is provided with a power device, and the operation control method comprises the following steps: detecting the working condition temperature of the power device and determining the carrier frequency of the power factor correction controller; the size relation between the working condition temperature and the preset temperature threshold is compared, the carrier frequency is adjusted according to the size relation, the duty ratio is dynamically adjusted along with the working condition of the compressor, a better compressor control effect is obtained, heating of a power device is restrained, loss of a switching device is reduced, and reliability of compressor control and durability of the control device are improved.
Description
Technical Field
The invention relates to the technical field of compressor control, in particular to an operation control method, an operation control system, a compressor, an air conditioner and a computer readable storage medium.
Background
Generally, a compressor control of the inverter air conditioner is controlled in a form of PWM (Pulse Width Modulation), and a carrier frequency is a key parameter in the PWM control.
Generally, the carrier frequency of a PFC (Power Factor Correction) in compressor control is mostly fixed and does not change with the change of an application scene, and the heat generation of a PFC Power device and the ripple of a bus capacitance current are not comprehensively considered. When the running frequency of the compressor is high, the PFC power device can generate heat seriously due to the excessively high PFC carrier frequency, so that a circuit and the compressor are damaged, and potential safety hazards are brought; when the running frequency of the compressor is low, the ripple amplitude of the bus capacitor current is too large due to the excessively low PFC carrier frequency, so that the compressor is damaged due to excessive harmonic components.
Therefore, a technical scheme is needed to adjust the carrier frequency according to the operating condition so that the controller always operates at the optimal carrier frequency, and the reliability of operation is ensured.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the invention proposes an operation control method.
A second aspect of the invention proposes an operation control system.
A third aspect of the present invention provides a compressor.
A fourth aspect of the present invention provides an air conditioner.
A fifth aspect of the invention proposes a computer-readable storage medium.
In view of the above, a first aspect of the present invention provides an operation control method, which is applied to a power supply control circuit, where the power supply control circuit is configured to connect a power supply signal of a bus to a compressor, and a power factor correction controller and a main control board are electrically connected to the power supply control circuit, where the power factor correction controller is provided with a power device, and the operation control method includes: detecting the working condition temperature of the power device and determining the carrier frequency of the power factor correction controller; and comparing the size relationship between the working condition temperature and the preset temperature threshold, and adjusting the carrier frequency according to the size relationship.
In the technical scheme, a corresponding temperature detection unit is arranged in an inverter bridge module, and the working condition temperature of a power device is detected in real time and sent to a main control module; the main control module sets an initial carrier frequency; meanwhile, the main control module compares the working condition temperature sampling value of the power module with a preset temperature threshold value, and dynamically adjusts the carrier frequency of the power device according to a specific comparison result. By applying the technical scheme provided by the invention, the carrier frequency is dynamically adjusted according to the working condition temperature of the power device in the power factor correction controller, on the basis of ensuring the operation effect of the power factor correction controller and the compressor, the power device is prevented from being burnt due to overheating, and the stability and reliability of the system are improved.
Specifically, the compressor control circuit includes a mains supply, a rectifier module, a Power Factor Correction (PFC) module, an inverter bridge module, and a main control chip. The main control chip collects power supply signals of the bus in real time and controls the compressor to operate according to the bus power supply signals. Meanwhile, the working condition temperature of a power device in the power factor controller is obtained in real time, and the carrier frequency of the power factor controller is adjusted in real time according to the working condition temperature. When the working condition temperature is lower, the carrier frequency of the power factor controller can be correspondingly improved in order to obtain a better control effect; and when the working condition temperature is higher and the overheating risk exists, the carrier frequency can be correspondingly reduced so as to prevent the overheating of the power device. The power device is maintained at a more ideal working condition temperature by dynamically adjusting the carrier frequency.
In addition, the operation control method in the above technical solution provided by the present invention may further have the following additional technical features:
in any of the above technical solutions, further, adjusting the carrier frequency according to the size relationship specifically includes: when the detected working condition temperature is smaller than a first temperature threshold value, adjusting the carrier frequency to improve a preset frequency value; when the detected working condition temperature is greater than or equal to the second temperature threshold value and less than a third temperature threshold value, adjusting the carrier frequency to reduce the preset frequency value; and when the detected working condition temperature is greater than or equal to the third temperature threshold value, adjusting the carrier frequency to be zero and sending a shutdown protection signal.
In the technical scheme, three corresponding temperature thresholds are set, and the comparison relation between the detected working condition temperature and the three corresponding temperature thresholds is judged in real time. Specifically, when the detected working condition temperature is smaller than the first temperature threshold value, the preset frequency value is correspondingly increased to appropriately increase the working condition temperature of the power device, so that a better control effect is obtained; when the detected working condition temperature is greater than or equal to the second temperature threshold and less than the third temperature threshold, the overheating trend of the power device is indicated, and the preset frequency value is correspondingly reduced to properly reduce the working condition temperature of the power device, so that the power device is prevented from being further heated to protect the normal work of the power device; when the working condition temperature is detected to be greater than or equal to the third temperature threshold, the power device is proved to be seriously overheated, the control circuit and the compressor have the risk of overheating damage under the condition, at the moment, the control circuit immediately adjusts the carrier frequency to be zero and sends out a shutdown protection signal, so that the power supply circuit of the compressor is immediately disconnected, the compressor is prevented from further heating, the overheating protection of the circuit and the device is further realized, and the safety and the reliability of the product are improved.
In any of the above technical solutions, further, after adjusting the carrier frequency to reduce the preset frequency value, the method further includes: comparing the magnitude relation between the adjusted carrier frequency and a preset carrier frequency; and when the carrier frequency is detected to be less than or equal to the preset carrier frequency, setting the carrier frequency as the preset carrier frequency.
In the technical scheme, after the carrier frequency is adjusted to reduce the preset frequency value, the adjusted carrier frequency is compared with the preset carrier frequency in the controller, the magnitude relation between the adjusted carrier frequency and the preset carrier frequency is determined, and when the carrier frequency obtained after adjustment is judged to be smaller than or equal to the preset carrier frequency, the current carrier frequency is replaced by the preset carrier frequency from the adjusted carrier frequency, so that the phenomenon that the compressor is damaged due to too low adjusted carrier frequency is avoided, the too low protection of the carrier frequency is realized, and the working reliability of the compressor is improved.
In any of the above technical solutions, further, the operation control method further includes: detecting a power supply signal of a bus and the running frequency of a compressor; and determining the duty ratio input to the power factor corrector according to the power supply signal and the operating frequency.
In the technical scheme, the bus is connected with the compressor and used for supplying power to the compressor, wherein a power supply control circuit is arranged on the bus, the control circuit can detect the power supply signal of the bus and the running frequency of the compressor in real time in the working process, and after the power supply signal and the running frequency are acquired, the control circuit comprehensively compares the power supply signal of the bus and the running frequency of the compressor so as to determine the duty ratio value needing to be input to the power factor corrector, so that the power supply control circuit can monitor and change the working states of the bus and the compressor in real time. By applying the technical scheme provided by the invention, the duty ratio is dynamically adjusted correspondingly along with the increase or decrease of the frequency of the compressor and the current state of the bus power supply signal through the control circuit, so that the corresponding control of the circuit and the compressor is realized.
In any of the above technical solutions, further, determining a duty ratio input to the pfc controller according to the power supply signal and the operating frequency specifically includes: determining a corresponding boosting coefficient according to the operating frequency, and determining a fundamental wave amplitude corresponding to the power supply signal; and calculating to obtain the duty ratio according to the power supply signal, the boosting coefficient and the fundamental wave amplitude.
In the technical scheme, a calculation method for determining the duty ratio input to the power factor correction controller according to the power supply signal and the operating frequency is defined. Firstly, determining a corresponding boosting coefficient K2 and a fundamental wave amplitude according to the operation frequency to obtain a ratio K1 of the fundamental wave amplitude and a target harmonic amplitude, and then calculating a duty ratio D by the following formula:
wherein, ImIs the input current amplitude; ω t represents the fundamental phase of the input current; n is a harmonic number of the higher harmonic, specifically a natural number of 2 or more. Therefore, the duty ratio obtained through calculation is used for realizing the corresponding control of the circuit and the compressor, further realizing the intelligent control of the compressor and strengthening the working stability of the compressor.
A second aspect of the present invention provides an operation control system, adapted to a power supply control circuit, where the power supply control circuit is configured to connect a power supply signal of a bus to a compressor, and a power factor correction controller and a main control board are electrically connected to the power supply control circuit, where the power factor correction controller is provided with a power device, and the operation control system includes: the detection module is used for detecting the working condition temperature of the power device; the control module is used for determining the carrier frequency of the power factor correction controller; and comparing the magnitude relation between the working condition temperature and the preset temperature threshold value, and adjusting the carrier frequency according to the magnitude relation.
In the technical scheme, a corresponding temperature detection unit is arranged in an inverter bridge module, and the working condition temperature of a power device is detected in real time and sent to a main control module; the main control module sets an initial carrier frequency; meanwhile, the main control module compares the working condition temperature sampling value of the power module with a preset temperature threshold value, and dynamically adjusts the carrier frequency of the power device according to a specific comparison result. By applying the technical scheme provided by the invention, the carrier frequency is dynamically adjusted according to the working condition temperature of the power device in the power factor correction controller, on the basis of ensuring the operation effect of the power factor correction controller and the compressor, the power device is prevented from being burnt due to overheating, and the stability and reliability of the system are improved.
In any of the above technical solutions, further, the control module is further configured to: when the detected working condition temperature is smaller than a first temperature threshold value, adjusting the carrier frequency to improve a preset frequency value; when the detected working condition temperature is greater than or equal to the second temperature threshold value and less than a third temperature threshold value, adjusting the carrier frequency to reduce the preset frequency value; and when the detected working condition temperature is greater than or equal to the third temperature threshold value, adjusting the carrier frequency to be zero and sending a shutdown protection signal.
In the technical scheme, three corresponding temperature thresholds are set, and the comparison relation between the detected working condition temperature and the three corresponding temperature thresholds is judged in real time. Specifically, when the detected working condition temperature is smaller than the first temperature threshold value, the preset frequency value is correspondingly increased to appropriately increase the working condition temperature of the power device, so that a better control effect is obtained; when the detected working condition temperature is greater than or equal to the second temperature threshold and less than the third temperature threshold, the overheating trend of the power device is indicated, and the preset frequency value is correspondingly reduced to properly reduce the working condition temperature of the power device, so that the power device is prevented from being further heated to protect the normal work of the power device; when the working condition temperature is detected to be greater than or equal to the third temperature threshold, the power device is proved to be seriously overheated, the control circuit and the compressor have the risk of overheating damage under the condition, at the moment, the control circuit immediately adjusts the carrier frequency to be zero and sends out a shutdown protection signal, so that the power supply circuit of the compressor is immediately disconnected, the compressor is prevented from further heating, the overheating protection of the circuit and the device is further realized, and the safety and the reliability of the product are improved.
In any of the above technical solutions, further, the control module is further configured to: comparing the magnitude relation between the adjusted carrier frequency and a preset carrier frequency; and when the carrier frequency is detected to be less than or equal to the preset carrier frequency, setting the carrier frequency as the preset carrier frequency.
In the technical scheme, after the carrier frequency is adjusted to reduce the preset frequency value, the adjusted carrier frequency is compared with the preset carrier frequency in the controller, the magnitude relation between the adjusted carrier frequency and the preset carrier frequency is determined, and when the carrier frequency obtained after adjustment is judged to be smaller than or equal to the preset carrier frequency, the current carrier frequency is replaced by the preset carrier frequency from the adjusted carrier frequency, so that the phenomenon that the compressor is damaged due to too low adjusted carrier frequency is avoided, the too low protection of the carrier frequency is realized, and the working reliability of the compressor is improved.
In any of the above technical solutions, further, the detection module is further configured to detect a power supply signal of the bus and an operating frequency of the compressor; the control module is also used for determining the duty ratio input to the power factor correction controller according to the power supply signal and the operating frequency.
In the technical scheme, the bus is connected with the compressor and used for supplying power to the compressor, wherein a power supply control circuit is arranged on the bus, the control circuit can detect the power supply signal of the bus and the running frequency of the compressor in real time in the working process, and after the power supply signal and the running frequency are acquired, the control circuit comprehensively compares the power supply signal of the bus and the running frequency of the compressor so as to determine the duty ratio value needing to be input to the power factor corrector, so that the power supply control circuit can monitor and change the working states of the bus and the compressor in real time. By applying the technical scheme provided by the invention, the duty ratio is dynamically adjusted correspondingly along with the increase or decrease of the frequency of the compressor and the current state of the bus power supply signal through the control circuit, so that the corresponding control of the circuit and the compressor is realized.
In any of the above technical solutions, further, the control module is further configured to: determining a corresponding boosting coefficient according to the operating frequency, and determining a fundamental wave amplitude corresponding to the power supply signal; and calculating to obtain the duty ratio according to the power supply signal, the boosting coefficient and the fundamental wave amplitude.
In the technical scheme, a calculation method for determining the duty ratio input to the power factor correction controller according to the power supply signal and the operating frequency is defined. Firstly, determining a corresponding boosting coefficient K2 and a fundamental wave amplitude according to the operation frequency to obtain a ratio K1 of the fundamental wave amplitude and a target harmonic amplitude, and then calculating a duty ratio D by the following formula:
wherein, ImIs the input current amplitude; ω t represents the fundamental phase of the input current; n is a harmonic number of the higher harmonic, specifically a natural number of 2 or more. Therefore, the duty ratio obtained by calculation is used for realizing the corresponding control of the circuit and the compressor, and further realizing the intellectualization of the compressorAnd controlling and strengthening the working stability of the compressor.
A third aspect of the present invention provides a compressor comprising an operation control system as described in any one of the above claims, whereby the compressor comprises all the benefits of the operation control system as described in any one of the above claims.
A fourth aspect of the present invention provides an air conditioner, which includes the operation control system according to any one of the above technical solutions and/or the compressor according to any one of the above technical solutions, and therefore, the air conditioner includes all the advantages of the operation control system according to any one of the above technical solutions and/or the compressor according to any one of the above technical solutions.
A fifth aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the compressor control method as described in any one of the above claims, and therefore, includes all the advantageous effects of the compressor control method as described in any one of the above claims.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a flow diagram of an operational control method according to one embodiment of the present invention;
FIG. 2 illustrates a schematic diagram of a compressor inverter bridge control circuit according to one embodiment of the present invention;
FIG. 3 shows a flow chart of an operation control method according to another embodiment of the present invention;
FIG. 4 shows a flow chart of an operation control method according to yet another embodiment of the present invention;
FIG. 5 shows a block diagram of an operation control system according to an embodiment of the invention;
fig. 6 shows a flowchart of an operation control method according to still another embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The operation control method, the operation control system, the compressor, the air conditioner, and the computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 6.
In an embodiment of the first aspect of the present invention, as shown in fig. 1, there is provided an operation control method, adapted to a power supply control circuit, where the power supply control circuit is configured to connect a power supply signal of a bus to a compressor, and a power factor correction controller and a main control board are electrically connected to each other, where the power factor correction controller is provided with a power device, and the operation control method includes:
s102, detecting the working condition temperature of the power device, and determining the carrier frequency of the power factor correction controller;
and S104, comparing the size relationship between the working condition temperature and the preset temperature threshold, and adjusting the carrier frequency according to the size relationship.
In the embodiment, a corresponding temperature detection unit is arranged in the inverter bridge module, and the working condition temperature of the power device is detected in real time and sent to the main control module; the main control module sets an initial carrier frequency; meanwhile, the main control module compares the working condition temperature sampling value of the power module with a preset temperature threshold value, and dynamically adjusts the carrier frequency of the power device according to a specific comparison result. By applying the technical scheme provided by the invention, the carrier frequency is dynamically adjusted according to the working condition temperature of the power device in the power factor correction controller, on the basis of ensuring the operation effect of the power factor correction controller and the compressor, the power device is prevented from being burnt due to overheating, and the stability and reliability of the system are improved.
Specifically, the compressor control circuit includes a mains supply, a rectifier module, a Power Factor Correction (PFC) module, an inverter bridge module, and a main control chip. The main control chip collects power supply signals of the bus in real time and controls the compressor to operate according to the bus power supply signals. Meanwhile, the working condition temperature of a power device in the power factor controller is obtained in real time, and the carrier frequency of the power factor controller is adjusted in real time according to the working condition temperature. When the working condition temperature is lower, the carrier frequency of the power factor controller can be correspondingly improved in order to obtain a better control effect; and when the working condition temperature is higher and the overheating risk exists, the carrier frequency can be correspondingly reduced so as to prevent the overheating of the power device. The power device is maintained at a more ideal working condition temperature by dynamically adjusting the carrier frequency.
In one embodiment of the present invention, further,
adjusting the carrier frequency according to the magnitude relationship specifically includes: when the detected working condition temperature is smaller than a first temperature threshold value, adjusting the carrier frequency to improve a preset frequency value; when the detected working condition temperature is greater than or equal to the second temperature threshold value and less than a third temperature threshold value, adjusting the carrier frequency to reduce the preset frequency value; and when the detected working condition temperature is greater than or equal to the third temperature threshold value, adjusting the carrier frequency to be zero and sending a shutdown protection signal.
In this embodiment, three corresponding temperature thresholds are set, and the comparison relationship between the detected operating condition temperature and the three corresponding temperature thresholds is determined in real time. Specifically, when the detected working condition temperature is smaller than the first temperature threshold value, the preset frequency value is correspondingly increased to appropriately increase the working condition temperature of the power device, so that a better control effect is obtained; when the detected working condition temperature is greater than or equal to the second temperature threshold and less than the third temperature threshold, the overheating trend of the power device is indicated, and the preset frequency value is correspondingly reduced to properly reduce the working condition temperature of the power device, so that the power device is prevented from being further heated to protect the normal work of the power device; when the working condition temperature is detected to be greater than or equal to the third temperature threshold, the power device is proved to be seriously overheated, the control circuit and the compressor have the risk of overheating damage under the condition, at the moment, the control circuit immediately adjusts the carrier frequency to be zero and sends out a shutdown protection signal, so that the power supply circuit of the compressor is immediately disconnected, the compressor is prevented from further heating, the overheating protection of the circuit and the device is further realized, and the safety and the reliability of the product are improved.
In an embodiment of the present invention, further, as shown in fig. 3, the operation control method includes:
s302, detecting the working condition temperature of the power device, and determining the carrier frequency of the power factor correction controller;
s304, comparing the size relationship between the working condition temperature and the preset temperature threshold value, and adjusting the carrier frequency according to the size relationship. S306, comparing the magnitude relation between the adjusted carrier frequency and a preset carrier frequency;
and S308, when the carrier frequency is detected to be less than or equal to the preset carrier frequency, setting the carrier frequency as the preset carrier frequency.
In this embodiment, after the carrier frequency is adjusted to reduce the preset frequency value, the adjusted carrier frequency is compared with the preset carrier frequency in the controller, the magnitude relationship between the adjusted carrier frequency and the preset carrier frequency is determined, and when the carrier frequency obtained after adjustment is judged to be less than or equal to the preset carrier frequency, the current carrier frequency is replaced by the preset carrier frequency from the adjusted carrier frequency, so that the phenomenon of compressor damage caused by too low carrier frequency after adjustment is avoided, over-low protection of the carrier frequency is realized, and the working reliability of the compressor is improved.
In an embodiment of the present invention, further, as shown in fig. 4, the operation control method includes:
s402, detecting a power supply signal of a bus and the running frequency of a compressor;
and S404, determining the duty ratio input to the power factor corrector according to the power supply signal and the operating frequency.
In the embodiment, the bus is connected with the compressor and used for supplying power to the compressor, wherein the bus is provided with the power supply control circuit, the control circuit can detect the power supply signal of the bus and the running frequency of the compressor in real time in the working process, and after the power supply signal and the running frequency are obtained, the control circuit comprehensively compares the power supply signal of the bus and the running frequency of the compressor to determine the duty ratio value which needs to be input to the power factor corrector, so that the power supply control circuit can monitor and change the working states of the bus and the compressor in real time. By applying the technical scheme provided by the invention, the duty ratio is dynamically adjusted correspondingly along with the increase or decrease of the frequency of the compressor and the current state of the bus power supply signal through the control circuit, so that the corresponding control of the circuit and the compressor is realized.
In an embodiment of the present invention, further, determining a duty ratio input to the pfc controller according to the power supply signal and the operating frequency specifically includes: determining a corresponding boosting coefficient according to the operating frequency, and determining a fundamental wave amplitude corresponding to the power supply signal; and calculating to obtain the duty ratio according to the power supply signal, the boosting coefficient and the fundamental wave amplitude.
In this embodiment, a calculation method is defined to determine the duty cycle input to the pfc controller based on the supply signal and the operating frequency. Firstly, determining a corresponding boosting coefficient K2 and a fundamental wave amplitude according to the operation frequency to obtain a ratio K1 of the fundamental wave amplitude and a target harmonic amplitude, and then calculating a duty ratio D by the following formula:
wherein, ImIs the input current amplitude; ω t represents the fundamental phase of the input current; n is a harmonic number of the higher harmonic, specifically a natural number of 2 or more. Therefore, the duty ratio obtained through calculation is used for realizing the corresponding control of the circuit and the compressor, further realizing the intelligent control of the compressor and strengthening the working stability of the compressor.
As shown in fig. 5, in an embodiment of the second aspect of the present invention, there is provided an operation control system 500, adapted to a power supply control circuit, the power supply control circuit being configured to connect a power supply signal of a bus to a compressor, the power supply control circuit being provided with a power factor correction controller and a main control board which are electrically connected, the power factor correction controller being provided with a power device, the operation control system comprising: the detection module 502 is used for detecting the working condition temperature of the power device; a control module 504 for determining a carrier frequency of the pfc controller; and comparing the magnitude relation between the working condition temperature and the preset temperature threshold value, and adjusting the carrier frequency according to the magnitude relation. In the embodiment, a corresponding temperature detection unit is arranged in the inverter bridge module, and the working condition temperature of the power device is detected in real time and sent to the main control module; the main control module sets an initial carrier frequency; meanwhile, the main control module compares the working condition temperature sampling value of the power module with a preset temperature threshold value, and dynamically adjusts the carrier frequency of the power device according to a specific comparison result. By applying the technical scheme provided by the invention, the carrier frequency is dynamically adjusted according to the working condition temperature of the power device in the power factor correction controller, on the basis of ensuring the operation effect of the power factor correction controller and the compressor, the power device is prevented from being burnt due to overheating, and the stability and reliability of the system are improved.
In one embodiment of the present invention, further, the carrier frequency of the power factor controller may be adjusted in real time according to the operating frequency of the compressor. Specifically, when the frequency of the compressor is low, the carrier frequency is correspondingly increased, so that a better control effect can be obtained; when the frequency of the compressor is higher, the carrier frequency of the switching device is correspondingly reduced, so that the hardware loss of the switching device can be reduced, and meanwhile, the heat generated by the controller is reduced; and then can realize along with compressor operating mode dynamic adjustment duty cycle, obtain better compressor control effect when, restrain the generating heat of power device simultaneously, reduce the loss of switching device, and then improve the reliability of compressor control and the durability of control device.
In an embodiment of the present invention, further, the control module is further configured to: when the detected working condition temperature is smaller than a first temperature threshold value, adjusting the carrier frequency to improve a preset frequency value; when the detected working condition temperature is greater than or equal to the second temperature threshold value and less than a third temperature threshold value, adjusting the carrier frequency to reduce the preset frequency value; and when the detected working condition temperature is greater than or equal to the third temperature threshold value, adjusting the carrier frequency to be zero and sending a shutdown protection signal.
In this embodiment, three corresponding temperature thresholds are set, and the comparison relationship between the detected operating condition temperature and the three corresponding temperature thresholds is determined in real time. Specifically, when the working condition temperature is detected to be smaller than the first temperature threshold value, the preset frequency value is correspondingly increased to appropriately increase the working condition temperature of the power device, so that a better control effect is obtained; when the detected working condition temperature is greater than or equal to the second temperature threshold and less than the third temperature threshold, the overheating trend of the power device is indicated, and the preset frequency value is correspondingly reduced to properly reduce the working condition temperature of the power device, so that the power device is prevented from being further heated to protect the normal work of the power device; when the working condition temperature is detected to be greater than or equal to the third temperature threshold, the power device is proved to be seriously overheated, the control circuit and the compressor have the risk of overheating damage under the condition, at the moment, the control circuit immediately adjusts the carrier frequency to be zero and sends out a shutdown protection signal, so that the power supply circuit of the compressor is immediately disconnected, the compressor is prevented from further heating, the overheating protection of the circuit and the device is further realized, and the safety and the reliability of the product are improved.
In an embodiment of the present invention, further, the control module is further configured to: comparing the magnitude relation between the adjusted carrier frequency and a preset carrier frequency; and when the carrier frequency is detected to be less than or equal to the preset carrier frequency, setting the carrier frequency as the preset carrier frequency.
In this embodiment, after the carrier frequency is adjusted to reduce the preset frequency value, the adjusted carrier frequency is compared with the preset carrier frequency in the controller, the magnitude relationship between the adjusted carrier frequency and the preset carrier frequency is determined, and when the carrier frequency obtained after adjustment is judged to be less than or equal to the preset carrier frequency, the current carrier frequency is replaced by the preset carrier frequency from the adjusted carrier frequency, so that the phenomenon of compressor damage caused by too low carrier frequency after adjustment is avoided, over-low protection of the carrier frequency is realized, and the working reliability of the compressor is improved.
In an embodiment of the present invention, further, the detecting module is further configured to detect a power supply signal of the bus and an operating frequency of the compressor; the control module is also used for determining the duty ratio input to the power factor correction controller according to the power supply signal and the operating frequency.
In the embodiment, the bus is connected with the compressor and used for supplying power to the compressor, wherein the bus is provided with the power supply control circuit, the control circuit can detect the power supply signal of the bus and the running frequency of the compressor in real time in the working process, and after the power supply signal and the running frequency are obtained, the control circuit comprehensively compares the power supply signal of the bus and the running frequency of the compressor to determine the duty ratio value which needs to be input to the power factor corrector, so that the power supply control circuit can monitor and change the working states of the bus and the compressor in real time. By applying the technical scheme provided by the invention, the duty ratio is dynamically adjusted correspondingly along with the increase or decrease of the frequency of the compressor and the current state of the bus power supply signal through the control circuit, so that the corresponding control of the circuit and the compressor is realized.
In an embodiment of the present invention, further, the control module is further configured to: determining a corresponding boosting coefficient according to the operating frequency, and determining a fundamental wave amplitude corresponding to the power supply signal; and calculating to obtain the duty ratio according to the power supply signal, the boosting coefficient and the fundamental wave amplitude.
In this embodiment, a calculation method is defined to determine the duty cycle input to the pfc controller based on the supply signal and the operating frequency. Firstly, determining a corresponding boosting coefficient K2 and a fundamental wave amplitude according to the operation frequency to obtain a ratio K1 of the fundamental wave amplitude and a target harmonic amplitude, and then calculating a duty ratio D by the following formula:
wherein, ImIs the input current amplitude; ω t represents the fundamental phase of the input current;n is a harmonic number of the higher harmonic, specifically a natural number of 2 or more. Therefore, the duty ratio obtained through calculation is used for realizing the corresponding control of the circuit and the compressor, further realizing the intelligent control of the compressor and strengthening the working stability of the compressor.
In an embodiment of the third aspect of the present invention, there is provided a compressor comprising an operation control system as described in any one of the above claims, whereby the compressor comprises all the benefits of the operation control system as described in any one of the above claims.
In an embodiment of the fourth aspect of the present invention, there is provided an air conditioner comprising the operation control system according to any one of the above technical solutions and/or the compressor according to any one of the above technical solutions, and therefore, the air conditioner comprises all the advantages of the operation control system according to any one of the above technical solutions and/or the compressor according to any one of the above technical solutions.
In an embodiment of the fifth aspect of the present invention, there is provided a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the compressor control method as described in any one of the above claims, and therefore, the computer readable storage medium comprises all the advantageous effects of the compressor control method as described in any one of the above claims.
In one embodiment of the present invention, as shown in fig. 6, the control circuit has the following working flow:
s602, setting an initial carrier frequency: before starting working, the main control board firstly sets an initial carrier frequency and controls operation according to the initial carrier frequency;
s604, detecting the working condition temperature of the power device;
s606, judging whether the detected working condition temperature is smaller than a first temperature threshold value, if so, executing S608, and if not, executing S610;
s608, increasing the preset frequency value, and then returning to S604: in the step, the control effect of the control circuit is influenced due to the fact that the working condition temperature is too low, so that the control effect of the control circuit can be improved by improving the preset frequency value;
s610, judging whether the detected working condition temperature is greater than or equal to a second temperature threshold and smaller than a third temperature threshold, if so, executing S612, and if not, executing S616;
s612, reducing a preset frequency value: in the step, if the working condition temperature is too high, the control effect of the control circuit is influenced, and potential safety hazards of the circuit and equipment are brought, and in order to avoid further temperature rise, the working condition temperature is reduced by reducing the preset frequency;
s614, judging whether the carrier frequency is less than or equal to the preset carrier frequency, if so, executing S620, and if not, returning to S604;
s620, setting the carrier frequency to a preset carrier frequency, and then returning to S604: in the step, the current carrier frequency is replaced by the preset carrier frequency, so that the phenomenon of overlarge oscillation frequency caused by the overlow carrier frequency can be avoided, and the overlow protection of the carrier frequency is further realized;
s616, judging whether the working condition temperature is greater than or equal to a third temperature threshold, if so, executing S618, and if not, ending the process;
s618, shutdown protection, and then ending the process: the step can be used for forcibly stopping when the working condition temperature is higher than the maximum temperature limit value, and preventing the circuit and the equipment from further heating, so that the stop protection of the compressor is realized.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically limited, the terms "upper", "lower", and the like indicate an orientation or positional relationship as illustrated in the drawings, which is merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. An operation control method is suitable for a power supply control circuit, the power supply control circuit is used for connecting a power supply signal of a bus into a compressor, a power factor correction controller and a main control board which are electrically connected are arranged in the power supply control circuit, the power factor correction controller is provided with a power device, and the operation control method is characterized by comprising the following steps of:
correcting and detecting the working condition temperature of the power device, and determining the carrier frequency of the power factor correction controller;
and comparing the size relationship between the working condition temperature and a preset temperature threshold value, and adjusting the carrier frequency according to the size relationship.
2. The operation control method according to claim 1, wherein the adjusting the carrier frequency according to the magnitude relationship specifically includes:
when the condition temperature is detected to be smaller than a first temperature threshold value, adjusting the carrier frequency to improve a preset frequency value;
when the working condition temperature is detected to be greater than or equal to a second temperature threshold value and smaller than a third temperature threshold value, adjusting the carrier frequency to reduce the preset frequency value;
and when the condition temperature is detected to be greater than or equal to a third temperature threshold value, adjusting the carrier frequency to be zero, and sending a shutdown protection signal.
3. The operation control method according to claim 2, further comprising, after the adjusting the carrier frequency by the preset frequency value:
comparing the magnitude relation between the adjusted carrier frequency and a preset carrier frequency;
and when the carrier frequency is detected to be less than or equal to the preset carrier frequency, setting the carrier frequency as the preset carrier frequency.
4. The operation control method according to any one of claims 1 to 3, wherein the correcting further includes:
detecting a power supply signal of the bus and the running frequency of the compressor;
determining the duty cycle input to the power factor corrector according to the power supply signal and the operating frequency.
5. The operation control method according to claim 4, wherein the determining the duty cycle input to the pfc according to the supply signal and the operating frequency specifically comprises:
determining a corresponding boost coefficient according to the operating frequency, and determining a fundamental wave amplitude corresponding to the power supply signal;
and calculating the duty ratio according to the power supply signal, the boosting coefficient and the fundamental wave amplitude.
6. The utility model provides an operation control system, is applicable to the power supply control circuit, the power supply control circuit is used for inserting the power supply signal of generating line compressor, be equipped with power factor correction controller and the main control board of electricity connection among the power supply control circuit, power factor correction controller is provided with power device, its characterized in that, operation control system includes:
the detection module is used for detecting the working condition temperature of the power device;
the control module is used for determining the carrier frequency of the power factor correction controller; and
and comparing the size relationship between the working condition temperature and a preset temperature threshold value, and adjusting the carrier frequency according to the size relationship.
7. The operational control system of claim 6, wherein the control module is further configured to:
when the condition temperature is detected to be smaller than a first temperature threshold value, adjusting the carrier frequency to improve a preset frequency value;
when the working condition temperature is detected to be greater than or equal to a second temperature threshold value and smaller than a third temperature threshold value, adjusting the carrier frequency to reduce the preset frequency value;
and when the condition temperature is detected to be greater than or equal to a third temperature threshold value, adjusting the carrier frequency to be zero, and sending a shutdown protection signal.
8. The operational control system of claim 7, wherein the control module is further configured to:
comparing the magnitude relation between the adjusted carrier frequency and a preset carrier frequency;
and when the carrier frequency is detected to be less than or equal to the preset carrier frequency, setting the carrier frequency as the preset carrier frequency.
9. The operation control system according to any one of claims 6 to 8,
the detection module is also used for detecting a power supply signal of the bus and the running frequency of the compressor;
the control module is further configured to determine the duty cycle input to the power factor corrector according to the power supply signal and the operating frequency.
10. The operational control system of claim 9, wherein the control module is further configured to:
determining a corresponding boost coefficient according to the operating frequency, and determining a fundamental wave amplitude corresponding to the power supply signal;
and calculating the duty ratio according to the power supply signal, the boosting coefficient and the fundamental wave amplitude.
11. A compressor, characterized in that it comprises an operation control system as claimed in any one of claims 6 to 10.
12. An air conditioner characterized by comprising an operation control system according to any one of claims 6 to 10; and/or
The compressor of claim 11.
13. A computer-readable storage medium on which a computer program is stored, the computer program, when being executed by a processor, implementing an operation control method according to any one of claims 1 to 5.
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| CN114674070A (en) * | 2020-12-24 | 2022-06-28 | 广东美的制冷设备有限公司 | Air conditioner control method, air conditioner and storage medium |
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