CN110793158B - Control circuit of alternating current fan and state detection method of alternating current fan of air conditioner - Google Patents
Control circuit of alternating current fan and state detection method of alternating current fan of air conditioner Download PDFInfo
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- CN110793158B CN110793158B CN201911079099.8A CN201911079099A CN110793158B CN 110793158 B CN110793158 B CN 110793158B CN 201911079099 A CN201911079099 A CN 201911079099A CN 110793158 B CN110793158 B CN 110793158B
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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
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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
- G01R19/1659—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 to indicate that the value is within or outside a predetermined range of values (window)
- G01R19/16595—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 to indicate that the value is within or outside a predetermined range of values (window) with multi level indication
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Abstract
The invention discloses a control circuit of an alternating current fan, which comprises a controller, a first control circuit, a second control circuit and a first control circuit, wherein the controller is connected with the first control circuit; the fan driving unit is connected between the controller and the alternating current fan and starts or closes the alternating current fan according to a control signal of the controller; the current detection unit is connected between the alternating current fan and the controller, and the current detection unit detects the current output of the alternating current fan and outputs the current to the controller. The invention also provides a state detection method of the alternating current fan of the air conditioner. The control circuit of the alternating current fan is provided with the current detection unit, the working current value of the alternating current fan is detected in real time or at regular time through the current detection unit, different working current values reflect different working states of the alternating current motor, the working current value is directly detected to detect the working state of the alternating current fan, the detection is more accurate and timely, and hysteresis does not exist.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control circuit of an alternating current fan, an air conditioner, a state detection method of the alternating current fan and a storage medium.
Background
Whether the state of an alternating current fan of the air conditioner is abnormal is generally determined by detecting whether the temperature of a condenser is abnormal, and the indirect mode is adopted to detect the state of the fan, so that the detection is not accurate enough and hysteresis exists.
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 mainly aims to provide a control circuit of an alternating current fan, an air conditioner, a state detection method of the alternating current fan of the air conditioner and a storage medium, and aims to solve the technical problems of inaccurate abnormality detection and hysteresis of the alternating current fan of the air conditioner.
In order to achieve the above object, the present invention provides a control circuit of an ac blower, including:
a controller;
the fan driving unit is connected between the controller and the alternating current fan and starts or closes the alternating current fan according to a control signal of the controller;
the current detection unit is connected between the alternating current fan and the controller, and the current detection unit detects the current output of the alternating current fan and outputs the current to the controller.
Optionally, the current detection unit includes a sampling module and a conversion module, one end of the sampling module is connected to the ac fan and the first input interface of the conversion module, and the other end of the sampling module is connected to the ac zero line and the second input interface of the conversion module.
Optionally, the conversion module includes a linear optical coupling element, a first resistor, a second resistor, and a third resistor, the linear optical coupling element includes a light emitting side and a light receiving side, the light emitting side includes a positive port and a negative port, the light receiving side includes a collector and an emitter, wherein:
the positive port of the linear optical coupling element is connected with the input end of the sampling module, the negative port of the linear optical coupling element is connected with the alternating current zero line through the second resistor, the emitter of the linear optical coupling element is connected with the controller through the second resistor, the emitter of the linear optical coupling element is grounded through the third resistor, and the collector of the linear optical coupling element is connected with the power supply
Optionally, the conversion module further includes a diode, an anode of the diode is connected to the ac zero line, and a cathode of the diode is connected to the first port.
Optionally, the fan driving unit includes a switch module and a first capacitor, a control end of the switch module is connected to the controller, a movable contact of the switch module is connected to the ac live wire, a stationary contact of the switch module is divided into two paths, one path is connected to the first interface of the ac fan through the first capacitor, and the other path is connected to the second interface of the ac fan.
The control circuit of the alternating current fan provided by the embodiment of the invention is provided with the current detection unit, the working current value of the alternating current fan is detected in real time or at regular time through the current detection unit, different working current values reflect different working states of the alternating current motor, the working current value is directly detected to detect the working state of the alternating current fan, the detection is more accurate and timely, and no hysteresis exists.
In order to achieve the above object, the present invention further provides a method for detecting a state of an ac blower of an air conditioner, wherein the method for detecting a state of an ac blower of an air conditioner is used to detect an operating current of an ac blower of the air conditioner, the air conditioner includes the control circuit of the ac blower, and the method for detecting a state of an ac blower of an air conditioner includes the following steps:
acquiring a working current value of the alternating current fan detected by a current detection unit of the control circuit;
and controlling the air conditioner to execute the action corresponding to the working current value.
Optionally, the step of controlling the air conditioner to execute the action corresponding to the working current value includes:
and when the working current value is in an abnormal current value interval, controlling the air conditioner to execute the action corresponding to the abnormal current value interval.
Optionally, the step of controlling the air conditioner to execute the action corresponding to the abnormal current value interval includes:
when the working current value is greater than or equal to a first preset current value or the working current value is less than or equal to a second preset current value, a compressor of the air conditioner is closed;
the second preset current value is smaller than the first preset current value, a current value interval larger than or equal to the first preset current value, or a current value interval smaller than or equal to the second preset current value is the abnormal current value interval.
Optionally, after the step of turning off the compressor of the air conditioner, the method further includes:
and turning off the alternating current fan.
Optionally, the step of controlling the air conditioner to execute the action corresponding to the working current value includes:
and outputting fault information corresponding to the abnormal current value interval when the working current value is in the abnormal current value interval.
Optionally, the abnormal current value interval includes at least one of a current value interval greater than or equal to the first preset current value, a current value interval less than or equal to the second preset current value, a current value interval less than the first preset current value and greater than a third preset current value, and a current interval greater than the second preset current value and less than a fourth preset current value.
Optionally, after the step of outputting the fault information corresponding to the abnormal current value section, the method further includes:
and after a preset time interval, closing the compressor and the alternating current fan.
The invention also provides an air conditioner, which comprises a memory, a processor and a state detection program which is stored on the memory and can run on the processor, wherein when the state detection program is executed by the processor, the state detection program realizes the steps of the state detection method of the alternating current fan of the air conditioner.
In addition, the invention also provides a storage medium, wherein the storage medium stores a state detection program, and the state detection program realizes the steps of the state detection method of the air conditioner alternating current fan when being executed by the processor.
The embodiment of the invention reflects different working states of the alternating current fan based on different working current values, and the working current value of the alternating current fan is directly detected by a control circuit of the alternating current fan, so that the accuracy of working state detection is improved; corresponding actions are executed by the air conditioner when the alternating current fan is set to be in different working states, whether the state of the alternating current fan is abnormal or not can be timely detected, and meanwhile corresponding protective measures can be timely made by the air conditioner, so that the air conditioner can safely and energy-saving operate.
Drawings
FIG. 1 is a functional block diagram of the control circuit of the AC fan of the present invention;
FIG. 2 is a schematic diagram of the control circuit of the AC fan of the present invention;
fig. 3 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating a method for detecting the status of an AC fan of an air conditioner according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating a method for detecting the status of an AC fan of an air conditioner according to another embodiment of the present invention;
fig. 6 is a flowchart illustrating a method for detecting a state of an ac fan of an air conditioner according to another embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main solution of the embodiment of the invention is as follows: the air conditioner is provided with a control circuit of the alternating current fan, and after the air conditioner obtains the working current value of the alternating current fan detected by the detection unit on the control circuit of the alternating current fan, the air conditioner is controlled to execute the action corresponding to the working current value.
The invention provides a control circuit of an alternating current fan, which is based on the problems that the working state of the alternating current fan of an air conditioner is indirectly detected, the detection result is inaccurate, and hysteresis exists.
Referring to fig. 1 in particular, fig. 1 is a schematic diagram of functional modules of a control circuit of an ac fan in an embodiment of the present invention. The control circuit of interchange fan includes:
a controller 10;
the fan driving unit 20, the fan driving unit 10 is connected between the controller 10 and the ac fan 40, and the fan driving unit 20 starts or stops the ac fan 40 according to a control signal of the controller 10;
and a current detection unit 30, wherein the current detection unit 30 is connected between the ac fan 40 and the controller 10, and the current detection unit 30 detects that the current of the ac fan 40 is output to the controller 10.
The fan driving unit 20 is configured to turn on or turn off the ac fan 40, the current detection unit 30 is connected to a current output end of the ac fan 40 and configured to detect a working current value of the current output end of the ac fan 40, and the controller 10 is configured to determine a working state of the ac fan 40 according to the working current value, and further control the fan driving unit 20 or other working components of the air conditioner 10 according to the working state of the ac fan 40.
The control process of the control circuit comprises the following steps: after receiving a start instruction, the controller 10 sends control information to the fan driving unit 20, the fan driving unit 20 starts the ac fan 40, in the working process of the ac fan 40, the current detection unit 30 detects a working current value of the ac fan 40 and outputs the detected working current value to the controller 10, the controller 10 determines the working state of the ac motor 40 according to the working current value, and determines whether to send a close instruction to the fan driving unit 20 according to the working state of the ac motor 40 to close the ac fan 40.
The control circuit of this embodiment alternating current fan sets up current detection unit 30 on, through current detection unit 30 detects alternating current fan 40's operating current value in real time or regularly, and different operating current value reflect alternating current motor's different operating condition, and the mode that direct detection operating current value detected alternating current fan 40 operating condition detects more accurately and in time, does not have the hysteresis quality.
Specifically, the current detection unit 30 includes a sampling module 31 and a conversion module 32, one end of the sampling module 31 is connected to the ac fan 40 and a first input interface of the conversion module 31, and the other end of the sampling module 31 is connected to the ac zero line and a second input interface of the conversion module 32. Sampling module 31 is used for gathering the operating current of exchanging fan 40 output, because the operating current of exchanging fan 40 output is the alternating current, sampling module 31 adopts after gathering operating current conversion module 32 will operating current converts direct current into direct current, and then will direct current output is to controller 10.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a control circuit of the ac fan in the embodiment of the present invention.
The control circuit comprises a controller, a fan driving unit and a current detection unit, the fan driving unit and the current detection unit are respectively connected with the alternating current fan, the alternating current fan is driven by a motor and comprises a first interface 1, a second interface 2 and a third interface 3, and the first interface 1, the second interface 2 and the third interface 3 of the alternating current fan are respectively connected with a three-phase winding of the motor.
The fan driving unit comprises a switch module RY1 and a first capacitor C1, the control end of the switch module RY1 is connected with the controller, a movable contact of the switch module RY1 is connected with an alternating current live wire, a static contact of the switch module RY1 is divided into two paths, one path is connected with a first interface 1 of the alternating current fan through the first capacitor C1, and the other path is connected with a second interface 2 of the alternating current fan. The switch module RY1 comprises a relay, and the first capacitor C1 is a starting first capacitor.
And a third interface 3 of the alternating current fan is connected with an alternating current zero line through the sampling module, wherein the sampling module is a fourth resistor R4. The conversion module comprises a linear optical coupling element IC1, a first resistor R1, a second resistor R2 and a third resistor R3, wherein the linear optical coupling element IC1 comprises a light emitting side and a light receiving side, and light emitted by the light emitting side is received by the light receiving side and then converted into a current or voltage signal. The light emitting side comprises a positive port and a negative port, the light receiving side comprises a collector and an emitter, wherein:
the positive port of the linear optical coupling element IC1 is connected with one end, connected with a third interface 3 of the alternating current fan, of the fourth resistor R4, the negative port of the linear optical coupling element IC1 is connected with an alternating current zero line through the second resistor R2, the emitter of the linear optical coupling element IC1 is connected with the controller 10 through the second resistor R2, the emitter of the linear optical coupling element IC1 is grounded through the third resistor R3, and the collector of the linear optical coupling element IC1 is connected with a power supply.
In this embodiment, the linear optical coupling element IC1 is formed by a light emitting diode on the emitting side, the anode of the light emitting diode is the anode port of the light emitting side, and the cathode of the diode is the cathode port of the light emitting side. The linear optocoupler element IC1 is formed by a triode on the light receiving side, a collector of the triode is connected with a power supply, and an emitter of the triode is grounded through the third resistor and connected with the controller through the second resistor.
The specific working principle of the control circuit is as follows: when the switch module RY1 gets the electricity to close, start first electric capacity C1 starts the alternating current fan, when the alternating current fan was under normal operating condition, the alternating current fan formed the return circuit through fourth resistance R4 and alternating current zero line, the output current of alternating current fan flowed to the negative pole port of linear opto-coupler element IC1 from the positive pole port of linear opto-coupler element IC1, the electric current after the light emission side of linear opto-coupler element IC1, convert to light, the light that the light emission side sent is received to the light receiving side of linear opto-coupler element IC1 to after converting to direct current, export to the controller, realize to the detection of the operating current value of alternating current fan.
Specifically, the voltage value transmitted to the controller is substantially a voltage value (voltage value across the third resistor) applied between the second resistor R2 and the light receiving side of the linear optical coupling element IC1, that is, the voltage actually detected by the controller is Ur3 ═ Ur1-0.7) × Ctr R3/R1, where Ctr is the current transmission ratio of the linear optical coupling element IC1, and the operating current value of the ac fan is calculated according to the voltage value, so as to realize detection of the operating current value of the ac fan.
Further, the conversion module further comprises a diode D1, an anode of the diode D1 is connected with the ac neutral line, and a cathode of the diode D1 is connected with the first port. The diode D1 in the control circuit of the alternating current fan is used for clamping reverse voltage at two ends of the linear optical coupling element IC1 to 0.7V when current is reversed, and protecting the linear optical coupling element IC 1.
The conversion module further comprises a second capacitor C2, one end of the second capacitor C2 is connected with one end of the second resistor R2 connected with the controller, the other end of the second capacitor C2 is grounded, and the second resistor R2 and the first capacitor C2 perform low-pass filtering processing on the voltage Ur3 signal to filter other interference loaded in the current signal transmitted to the controller.
The embodiment of the invention also provides a method for detecting the state of the alternating current fan of the air conditioner.
As shown in fig. 3, the terminal may include: a processor 1001, such as a CPU, a memory 1005, and a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Optionally, the terminal may further include a network interface 1004 and a user interface 1003, where the user interface 1003 may include a Display screen (Display) and an input unit such as a front panel operation keyboard, the Display screen is used to Display operation parameters of the air conditioner, the front panel operation keyboard is used to input setting operations such as setting temperature, and the optional user interface 1003 may further include a standard wired interface and a standard wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). Optionally, the terminal may further include a camera, a sensor, a WiFi module, and the like.
Those skilled in the art will appreciate that the terminal structure shown in fig. 3 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
It is understood that the hardware involved in the method embodiments may also include storage media, as shown with reference to fig. 3, and that the memory 1005, which is a kind of computer storage media, may include an operating system, a network communication module, a user interface module, and a state detection program therein.
In the terminal shown in fig. 3, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to call the state detection program stored in the memory 1005 and perform the following operations:
acquiring a working current value of the alternating current fan detected by a current detection unit of the control circuit;
and controlling the air conditioner to execute the action corresponding to the working current value.
Further, the processor 1001 may call the state detection program stored in the memory 1005, and also perform the following operations:
and when the working current value is in an abnormal current value interval, controlling the air conditioner to execute the action corresponding to the abnormal current value interval.
Further, the processor 1001 may call the state detection program stored in the memory 1005, and also perform the following operations:
when the working current value is greater than or equal to a first preset current value or the working current value is less than or equal to a second preset current value, a compressor of the air conditioner is closed;
the second preset current value is smaller than the first preset current value, a current value interval larger than or equal to the first preset current value, or a current value interval smaller than or equal to the second preset current value is the abnormal current value interval.
Further, the processor 1001 may call the state detection program stored in the memory 1005, and also perform the following operations:
and turning off the alternating current fan.
Further, the processor 1001 may call the state detection program stored in the memory 1005, and also perform the following operations:
and outputting fault information corresponding to the abnormal current value interval when the working current value is in the abnormal current value interval.
Further, the processor 1001 may call the state detection program stored in the memory 1005, and also perform the following operations:
and after a preset time interval, closing the compressor and the alternating current fan.
The alternating current fan control circuit based on the air conditioner is provided with a current detection unit, different working current values of the alternating current fan are detected, different working states of the alternating current fan are reflected, and based on the method, a state detection method of the alternating current fan of the air conditioner is set.
According to an embodiment, referring to fig. 4, the method for detecting the state of the ac fan of the air conditioner includes the following steps:
step S10, obtaining the working current value of the alternating current fan detected by the current detection unit of the control circuit;
and step S20, controlling the air conditioner to execute an operation corresponding to the operating current value.
The state detection method is used for detecting the state of an alternating current fan of an air conditioner, specifically, a control circuit of the alternating current fan in the embodiment is arranged on the air conditioner, a current detection unit in the control circuit of the alternating current fan directly detects the working current value of the alternating current fan, the detected working current is output to a controller, and the controller can determine the working state of the alternating current fan according to the detected working current value. The process and the principle of the control circuit of the alternating-current fan for specifically detecting the working current of the alternating-current fan are the same as those of the embodiment, and the detection process of the control circuit of the alternating-current fan is not repeated in this embodiment.
The working state of the alternating current fan comprises normal rotation, abnormal rotation, non-rotation and the like, if the alternating current fan normally rotates, the alternating current fan operates according to a set rotating speed or set power, if the alternating current fan abnormally rotates, the difference value between the rotating speed of the alternating current fan and the set rotating speed is larger than a preset value, and if the alternating current fan does not rotate, the alternating current fan does not rotate when the alternating current fan is started or stops rotating in the rotating process. The working current values output by the alternating current fan under different working states are different, the range of the specific working current value or the working current value under different working states is detected through experiments, for example, the working current value of the alternating current fan is A or the range of the working current value is A1-A2 during normal rotation, the working current value of the alternating current fan is B or the range of the working current value is B1-B2 during abnormal rotation, the working current value C or the range of the working current value of the alternating current fan is C1-C2 during non-rotation, based on the difference of the corresponding working current values under different working states, the working current value of the alternating current fan can directly reflect the working state of the alternating current fan, thus, the working current value is adopted to detect whether the fan runs abnormally by utilizing the principle that the working current value can directly reflect the working state of the alternating current fan, the method comprises the steps of establishing a mapping relation between a working state and a working current value, obtaining the working current value of the alternating current fan detected by the current detection unit through establishing a relation to an execution action made by the air conditioner under different working states, judging the current state of the alternating current fan according to the working current value, and controlling the air conditioner to execute a corresponding action based on the current state of the alternating current fan, so that the damage of the alternating current fan or the influence of other components of the air conditioner on the use effect of the air conditioner due to the working state of the alternating current fan can be prevented in time.
Specifically, the effect produced in this embodiment is exemplified by an ac fan start scene, and the method for detecting the state of the ac fan further includes: when an air conditioner starting instruction is acquired, a compressor and an alternating current fan of the air conditioner are started; and obtaining the working current value of the alternating current fan, if the difference value between the working current value of the alternating current fan and the rated current value is smaller than a first preset value, indicating that the alternating current fan does not rotate (such as a short circuit of a relay), and controlling the compressor of the air conditioner to be closed at the moment. Because the working current value of the alternating current fan can be detected at the moment of starting the alternating current fan, if the alternating current fan is abnormally started, the compressor of the air conditioner can be turned off, and the phenomenon that the compressor continues to operate under the condition that the alternating current fan is not normally started to cause energy waste is avoided.
In the embodiment, different working states of the alternating current fan are reflected based on different working current values, and the working current value of the alternating current fan is directly detected through a control circuit of the alternating current fan, so that the accuracy of working state detection is improved; corresponding actions are executed by the air conditioner when the alternating current fan is set to be in different working states, whether the state of the alternating current fan is abnormal or not can be timely detected, and meanwhile corresponding protective measures can be timely made by the air conditioner, so that the air conditioner can safely and energy-saving operate.
Referring to fig. 5, the present embodiment provides another embodiment based on the embodiment shown in fig. 4, and the present embodiment is a further embodiment of the foregoing embodiment, and step S20 in the present embodiment includes:
and step S21, when the operating current value is in an abnormal current value interval, controlling the air conditioner to execute an operation corresponding to the abnormal current value interval.
Generating abnormal current value intervals according to corresponding working current values when various abnormalities occur in the working of the alternating current fan, controlling the air conditioner to execute actions corresponding to the abnormal current value intervals when detecting that the working current value in the actual working process is positioned in the abnormal current value intervals, wherein each abnormal current value interval reflects at least one abnormal state of the alternating current fan, and the abnormal current value intervals comprise at least one of a current value interval which is larger than or equal to a first preset current value, a current value interval which is smaller than or equal to a second preset current value, a current value interval which is smaller than the first preset current value and larger than a third preset current value and a current interval which is larger than the second preset current value and smaller than a fourth preset current value, if the current value interval which is larger than or equal to the first preset current value reflects the locked-rotor state of the alternating current fan, the current value interval which is smaller than or equal to the second preset current value reflects the open circuit state of the alternating current fan, the current value interval which is smaller than the first preset current value and larger than the third preset current value reflects the overload state of the alternating current fan, and the current interval which is larger than the second preset current value and smaller than the fourth preset current value reflects the idle state of the alternating current fan, wherein the first preset current value, the third preset current value, the fourth preset current value and the first preset current value are sequentially reduced in size. The air conditioner has different operations according to different abnormal current value intervals, so that when the working current value is in the abnormal current value interval, the corresponding abnormal type (reason and position) of the abnormal current value interval is determined, and the controller is controlled to execute the corresponding action according to the abnormal type.
Specifically, the controlling the air conditioner to execute the action corresponding to the abnormal current value interval includes: and when the working current value is in the abnormal current value interval, closing the compressor.
Because the reason that the operating condition of exchanging the fan is unusual has a lot of, and some unusual reasons need not in time close the compressor, if exchange the fan load when too big, can continue the operation, if in time close the compressor, then can influence the heat transfer effect of air conditioner, therefore, this embodiment is in order to improve exchanging the detection of fan abnormal state the operating current value is greater than or equal to first default current value, or when operating current value is less than or equal to second default current value, closes the compressor of air conditioner, wherein, second default current value is less than first default current value.
In this embodiment, the ac fan includes a rotation state and a non-rotation state, for example, the rotation state means that the ac fan can rotate under the driving of the driving member, and the non-rotation state means that the ac fan cannot rotate under the driving of the driving member. The working current value of the alternating current fan in the rotating state is between the first preset current value and the second preset current value, namely the working current value is larger than the second preset current value and smaller than the first preset current value, and the working current value of the alternating current fan in the non-rotating state is out of the range formed by the first preset current value and the second preset current value. The first preset current value is N times of the rated current value of the alternating current fan (N is larger than 1 and smaller than equal to 2), and the second preset current value is 0.
The alternating current fan cannot rotate under the driving of the driving piece, and the current working state of the alternating current fan is indicated to be an abnormal working state. If yes, the alternating current fan is judged to rotate, and the heat exchange of the air conditioner can be normally carried out.
In a further embodiment, after the step of turning off the compressor of the air conditioner and after the step of controlling the compressor of the air conditioner, the method further includes:
and turning off the alternating current fan.
When detecting that the ac fan does not rotate, if the driving member continues to drive the ac fan at this time, either the driving force is useless, or the driving force of the driving member is caused, so in order to protect the ac fan, in this embodiment, the ac fan is also turned off while the compressor of the air conditioner is turned off, so as to stop driving the ac fan.
It is understood that the reason why the ac fan is not rotated includes at least the following two reasons:
firstly, a driving circuit of the alternating current fan is broken or the inside of an indoor unit of the air conditioner is broken and damaged. If a switch in a control circuit of the alternating current fan is disconnected or damaged, the control circuit cannot control the alternating current fan to rotate, and at the moment, the alternating current fan cannot rotate.
Secondly, alternating current fan lock-rotor, if alternating current fan's fan blade is blockked by the object for alternating current fan also can not rotate under the drive of driving piece, and alternating current fan can not rotate this moment, but alternating current fan's control circuit is working, and the lock-rotor time overlength causes alternating current fan overheated damage easily.
Therefore, in the embodiment, by detecting the working current value of the alternating current fan, the current working state of the alternating current fan can be timely and accurately judged according to the working current value, and when the working state of the alternating current fan is abnormal, a protective measure can be timely taken.
Referring to fig. 6, a further embodiment is proposed based on the embodiment shown in fig. 4, in this embodiment, the step S20 further includes:
and step S22, when the operating current value is in an abnormal current value interval, outputting fault information corresponding to the abnormal current value interval.
Generating abnormal current value intervals according to corresponding working current values when various abnormalities occur in the working of the alternating current fan, outputting corresponding fault information according to the abnormal current value intervals when the working current values in the actual working process are detected to be positioned in the abnormal current value intervals, wherein each abnormal current value interval reflects at least one abnormal state of the alternating current fan, the abnormal current value intervals comprise at least one of a current value interval which is larger than or equal to a first preset current value, a current value interval which is smaller than or equal to a second preset current value, a current value interval which is smaller than the first preset current value and is larger than a third preset current value and a current interval which is larger than the second preset current value and is smaller than a fourth preset current value, and if the current value interval which is larger than or equal to the first preset current value reflects the locked-rotor state of the alternating current fan, the current value interval which is smaller than or equal to the second preset current value reflects the open circuit state of the alternating current fan, the current value interval which is smaller than the first preset current value and larger than the third preset current value reflects the overload state of the alternating current fan, and the current interval which is larger than the second preset current value and smaller than the fourth preset current value reflects the idling state of the alternating current fan.
Different fault prompt information is set to correspond to different abnormal current value intervals, so that a user can conveniently determine the type (reason, position and the like) of the abnormal state of the alternating current fan according to the type of the fault prompt information.
As can be seen from the embodiment of fig. 5, when the working current value is smaller than the first preset current value and larger than the second preset current value, the ac fan is in a rotating state, that is, when the working current value is smaller than the first preset current value and larger than the second preset current value, the ac fan can rotate. However, in the process that the alternating current fan can rotate, abnormal rotation conditions can exist, such as the alternating current fan rotates in an overload mode or the alternating current fan rotates in an idle mode, when the alternating current fan rotates abnormally, normal heat exchange of the air conditioner can be affected, and the service life of a heat exchange assembly of the air conditioner can be further affected.
Based on this, the present embodiment sets that the rotation state of the ac fan includes two states, i.e., normal rotation and abnormal rotation, where normal rotation refers to that the ac fan rotates according to a set rotation speed or a set rotation speed range, or the power of the ac fan is within a power range corresponding to the set rotation speed, and abnormal rotation refers to that the difference between the actual rotation and the set rotation speed of the ac fan is smaller than a preset value, such as the actual rotation speed is far smaller than the set rotation speed, or the power of the ac fan is far larger than the power corresponding to the set rotation speed, such as overload rotation, or the power of the ac fan is far smaller than the power corresponding to the set rotation speed, such as idling of the ac fan.
When the alternating current fan rotates normally, the working current value output by the alternating current fan is within the normal range of the rated working current value, if the rated working current is Ie, the working current value is N1Ie～N2When the current is within the Ie range (in the working current value range), the alternating current fan rotates normally, wherein N1Greater than or equal to 0.2Ie, less than or equal to 1, N2Greater than or equal to 1 and less than 2. In the abnormal rotation of the AC fanWhen the alternating current fan runs in an idle state, the working current value of the alternating current fan is smaller than the fourth preset current value. Wherein the third preset current value is smaller than the first preset current value, the fourth preset current value is smaller than the third preset current value and larger than the second preset current value, and the relationship between the first preset current value, the second preset current value, the third preset current value, the fourth preset current value and the rated working current value includes but is not limited to the following embodiments:
the first preset current value is 2Ie, the third preset current value is Ie, the second preset current value is 0, the fourth preset current value is 0.2Ie, when the working current value is between 2Ie and 0 (not including the 0 end point), the alternating current fan can rotate, when the working current value is between 2Ie and Ie, the alternating current fan is overloaded, when the working current value is between 0.2Ie and Ie, the alternating current fan rotates normally, when the working current value is between 0 to 0.2Ie (not including the 0 end point), the alternating current fan idles.
In addition, the reason for the overload rotation of the alternating current fan comprises that the rotating shaft is too long in rotating time, and the resistance of the rotating shaft is increased, so that the rotating load of the alternating current fan is too large, or an object is wound on the rotating shaft, and the resistance is generated on the rotating shaft, so that the rotating load of the alternating current fan is too large.
The reason for the idling of the alternating current fan comprises that an air inlet or an air outlet of the air conditioner is shielded by an object, so that no air flows in an air channel where the alternating current fan is located, and the idling of the alternating current fan is caused due to no load on the alternating current fan.
And setting mapping relations between different abnormal current value intervals and the abnormal rotation type and corresponding execution actions of the air conditioner based on the type and the reason of the abnormal rotation of the alternating current fan and the generated different abnormal current value intervals, further determining the abnormal current value interval where the working current value is located after the working current value is obtained, and controlling the air conditioner to execute the action of response according to the abnormal current value interval. If corresponding fault prompt information is output according to the abnormal current value interval, the fault prompt information corresponding to different abnormal current value intervals is different, the fault prompt information comprises prompt information of fault positions or fault reasons, the type of the abnormal rotation of the alternating current fan is determined according to the abnormal current value interval, the fault positions or the fault reasons can be determined according to the type of the abnormal rotation of the alternating current fan, then corresponding fault codes are output, and a user can timely process the fault information through the fault codes. The output mode of the fault information may include displaying on a panel, or sending to a mobile terminal of a user, or playing a fault information prompt tone or prompt voice.
The detection is that the working current value is smaller than the first preset current value and is larger than or equal to the third preset current value, or the working current value is larger than the second preset current value and is smaller than the fourth preset current value, the working state of the alternating current motor is determined to be a rotation abnormal state, the fault position or the fault reason of a user can be directly prompted through outputting fault information corresponding to the abnormal current value interval, the timeliness of the detection of the abnormal state of the alternating current fan is combined with the reminding of the fault position or the fault reason, so that the fault of the air conditioner can be timely processed, the hysteresis of the detection of the abnormal state of the air conditioner is solved, and the long-time abnormal operation of the air conditioner when the fault information of the air conditioner is received is avoided, and the service life of the air conditioner is influenced.
In a further embodiment, after the step of outputting the fault information corresponding to the abnormal current value interval, the method further includes:
and after a preset time interval, closing the compressor and the alternating current fan.
After the air conditioner outputs the fault prompt information, in order to prevent the alternating current fan of the air conditioner from continuing to abnormally rotate and damaging the alternating current fan, the compressor and the alternating current fan are automatically closed after a preset time interval. Or after a preset time interval, if the compressor and the alternating current fan are detected not to be closed, the compressor and the alternating current fan are automatically closed. Or after a preset time interval, when the working current value of the alternating current fan is smaller than the first preset current value and is larger than or equal to a third preset current value, or when the working current value is larger than the second preset current value and is smaller than a fourth preset current value, namely the working current value is still between 2Ie and Ie, or the working current value is still between 0 and 0.2Ie, the compressor and the alternating current fan are turned off, so that the long-time abnormal operation of the air conditioner is avoided, and the air conditioner is protected.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (13)
1. A control circuit of an AC fan, the control circuit of the AC fan comprising:
a controller;
the fan driving unit is connected between the controller and the alternating current fan and starts or closes the alternating current fan according to a control signal of the controller;
the current detection unit comprises a sampling module and a conversion module, one end of the sampling module is respectively connected with the alternating current fan and a first input interface of the conversion module, the other end of the sampling module is respectively connected with an alternating current zero line and a second input interface of the conversion module, the conversion module comprises a linear optical coupling element, a first resistor, a second resistor and a third resistor, the linear optical coupling element comprises a light emitting side and a light receiving side, the light emitting side comprises an anode port and a cathode port, the light receiving side comprises a collector electrode and an emitter electrode, after the sampling module collects working current, the conversion module is adopted to convert the working current into direct current, the current detection unit is connected between the alternating current fan and the controller, and the current detection unit is used for detecting the working current value of the current output end of the alternating current fan, and outputting the detected working current value of the alternating current fan to the controller, determining the working state of the alternating current fan by the controller according to the working current value, and further controlling the fan driving unit or other working components of the air conditioner according to the working state of the alternating current fan, wherein different working current values reflect different working states of the alternating current fan, the alternating current fan is in different working states, and the controller controls the fan driving unit or other working components of the air conditioner to execute corresponding actions.
2. The control circuit of the ac fan according to claim 1, wherein a positive port of the linear optical coupling element is connected to one end of the sampling module, which is connected to the ac fan, a negative port of the linear optical coupling element is connected to the ac neutral line via the second resistor, an emitter of the linear optical coupling element is connected to the controller via the second resistor, an emitter of the linear optical coupling element is grounded via the third resistor, and a collector of the linear optical coupling element is connected to a power supply.
3. The ac fan control circuit of claim 2, wherein the conversion module further comprises a diode, an anode of the diode is connected to the ac neutral line, and a cathode of the diode is connected to the first port.
4. The control circuit of the ac fan according to claim 1, wherein the fan driving unit includes a switch module and a first capacitor, a control end of the switch module is connected to the controller, a movable contact of the switch module is connected to the ac live wire, a stationary contact of the switch module is divided into two paths, one path is connected to the first interface of the ac fan through the first capacitor, and the other path is connected to the second interface of the ac fan.
5. A state detection method of an AC fan of an air conditioner, which is characterized in that the air conditioner comprises a control circuit of the AC fan according to any one of claims 1 to 4, and the state detection method of the AC fan of the air conditioner comprises the following steps:
acquiring a working current value of the alternating current fan detected by a current detection unit of the control circuit;
and controlling the air conditioner to execute the action corresponding to the working current value.
6. The status detecting method according to claim 5, wherein the step of controlling the air conditioner to perform the operation corresponding to the operating current value includes:
and when the working current value is in an abnormal current value interval, controlling the air conditioner to execute the action corresponding to the abnormal current value interval.
7. The method for detecting the state of the ac fan of the air conditioner according to claim 6, wherein the step of controlling the air conditioner to perform the action corresponding to the abnormal current value section comprises:
when the working current value is greater than or equal to a first preset current value or the working current value is less than or equal to a second preset current value, a compressor of the air conditioner is closed;
the second preset current value is smaller than the first preset current value, a current value interval larger than or equal to the first preset current value, or a current value interval smaller than or equal to the second preset current value is the abnormal current value interval.
8. The method for detecting the condition of an ac blower of an air conditioner as claimed in claim 7, wherein the step of turning off the compressor of the air conditioner further comprises, after the step of turning off the compressor of the air conditioner:
and turning off the alternating current fan.
9. The state detection method according to claim 5, wherein the step of controlling the air conditioner to perform the action corresponding to the operating current value comprises:
and outputting fault information corresponding to the abnormal current value interval when the working current value is in the abnormal current value interval.
10. The method of claim 9, wherein the abnormal current value interval includes at least one of a current value interval greater than or equal to the first preset current value, a current value interval less than or equal to the second preset current value, a current value interval less than the first preset current value and greater than a third preset current value, and a current interval greater than the second preset current value and less than a fourth preset current value.
11. The method for detecting the state of the ac fan of the air conditioner according to claim 9, wherein after the step of outputting the fault information corresponding to the abnormal current value section, the method further comprises:
and after a preset time interval, closing the compressor and the alternating current fan.
12. An air conditioner, characterized in that the air conditioner comprises a memory, a processor and a state detection program stored on the memory and capable of running on the processor, wherein the state detection program, when executed by the processor, implements the steps of the method for detecting the state of the ac fan of the air conditioner according to any one of claims 5 to 11.
13. A storage medium having a state detection program stored thereon, the state detection program when executed by a processor implementing the steps of the method for detecting the state of an ac blower of an air conditioner according to any one of claims 5 to 11.
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| CN2588429Y (en) * | 2002-10-23 | 2003-11-26 | 上海日立电器有限公司 | One-driving-three central air conditioner controller |
| WO2017179049A1 (en) * | 2016-04-12 | 2017-10-19 | Grid4C | A method and system for hvac malfunction and inefficiency detection over smart meters data |
| CN207764335U (en) * | 2018-01-19 | 2018-08-24 | 宁波方太厨具有限公司 | A kind of detection circuit of leak current fault |
| CN108825545A (en) * | 2018-06-06 | 2018-11-16 | 珠海格力电器股份有限公司 | Fan detection method, device and system and air conditioning equipment |
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| CN2588429Y (en) * | 2002-10-23 | 2003-11-26 | 上海日立电器有限公司 | One-driving-three central air conditioner controller |
| WO2017179049A1 (en) * | 2016-04-12 | 2017-10-19 | Grid4C | A method and system for hvac malfunction and inefficiency detection over smart meters data |
| CN207764335U (en) * | 2018-01-19 | 2018-08-24 | 宁波方太厨具有限公司 | A kind of detection circuit of leak current fault |
| CN108825545A (en) * | 2018-06-06 | 2018-11-16 | 珠海格力电器股份有限公司 | Fan detection method, device and system and air conditioning equipment |
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