Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
Therefore, the invention aims to provide a detection circuit for detecting the locked-rotor of the fan motor of the refrigerator.
Another object of the present invention is to provide a refrigerator.
Still another object of the present invention is to provide a control method of a refrigerator.
To achieve the above object, according to an embodiment of a first aspect of the present invention, there is provided a detection circuit for detecting a locked-rotor of a fan motor of a refrigerator, including: the input end of the current detection circuit is connected to the drive circuit of the refrigerator fan motor, and the current in the drive circuit of the refrigerator fan motor is detected; the input end of the amplifying circuit is connected to the output end of the current detection circuit, and the amplifying circuit amplifies the first voltage signal output by the current detection circuit to output an amplified second voltage signal; and the control circuit is connected to the amplifying circuit, receives the second voltage signal output by the amplifying circuit and judges whether the motor of the refrigerator fan is locked according to the change of the second voltage signal.
According to the detection circuit for detecting the locked rotor of the fan motor of the refrigerator, the current in the fan motor is detected through the current detection circuit, the output voltage of the current detection circuit is amplified through the amplifying circuit, and therefore whether the locked rotor of the motor of the fan of the refrigerator occurs or not is judged through judging the change of the voltage.
According to an embodiment of the present invention, the current detection circuit includes: and one end of the current detection resistor is connected to the motor and the input end of the amplifying circuit, and the other end of the current detection resistor is grounded.
According to the detection circuit for the locked rotor of the fan motor of the refrigerator, the current in the motor can be detected by adopting the current detection resistor, so that the state of the motor can be judged according to the current in the motor.
According to an embodiment of the present invention, further comprising: the amplification circuit includes: the positive input end of the operational amplifier is connected to the output end of the current detection circuit, the first resistor and the second resistor are connected between the output end of the operational amplifier and the ground in series, and the negative input end of the operational amplifier is connected to the common end of the first resistor and the second resistor.
According to the detection circuit for the refrigerator fan motor stalling, the amplifying circuit is composed of the operational amplifier, the first resistor and the second resistor, wherein the first resistor and the second resistor determine the amplification factor of the amplifying circuit, and different amplification factors can be adopted by adjusting the resistance values of the first resistor and the second resistor.
According to an embodiment of the present invention, further comprising: and the current limiting resistor is connected between the output end of the current detection circuit and the input end of the amplifying circuit and limits current entering the amplifying circuit.
According to the detection circuit for the refrigerator fan motor stalling, the current limiting resistor is connected between the current detection circuit and the amplifying circuit, so that the amplifying circuit is protected to a certain extent when the current in the motor is suddenly increased.
According to an embodiment of the present invention, further comprising: and the impedance matching resistor is connected between the output end of the amplifying circuit and the control circuit so as to match the impedance of the amplifying circuit and the control circuit.
According to the detection circuit for the locked rotor of the fan motor of the refrigerator, the impedance matching resistor is connected between the amplifying circuit and the control circuit, so that the voltage output by the amplifying circuit can be matched with the control circuit.
According to an embodiment of the second aspect of the present invention, there is also provided a refrigerator including: the detection circuit for the locked rotor of the fan motor of the refrigerator in any one of the technical schemes; and the alarm circuit is connected to a control circuit in the detection circuit for the refrigerator fan motor stalling, and carries out alarm prompt according to the received alarm command sent by the control circuit when the control circuit judges that the motor stalls.
According to the embodiment of the invention, the refrigerator comprises the detection circuit and the alarm circuit for the locked rotor of the fan motor of the refrigerator in the technical scheme, so that when the motor is locked, alarm prompt can be performed, and abnormal refrigeration of the refrigerator is avoided.
According to an embodiment of the present invention, further comprising: and the display circuit is connected to the control circuit and displays the motor locked-rotor fault display code according to the received motor locked-rotor fault display code sent by the control circuit when the control circuit judges that the motor is locked-rotor.
According to the refrigerator provided by the embodiment of the invention, the alarm prompt is carried out, and the fault code can be displayed, so that a user can conveniently know the specific fault of the refrigerator to adopt corresponding processing operation.
According to an embodiment of the present invention, further comprising: and the defrosting circuit is connected to the control circuit, and when the control circuit judges that the motor is locked, the defrosting circuit carries out defrosting operation according to the received defrosting command sent by the control circuit.
According to the refrigerator provided by the embodiment of the invention, the fan and the fan of the refrigerator are blocked, and the problem can be solved by defrosting due to the fact that the blades of the fan and the fan are blocked by ice, at the moment, the refrigerator is subjected to forced defrosting operation, the defrosting exit temperature is increased by 10 degrees compared with the original temperature, the defrosting time is ensured to be long enough, and the excessive heat can melt the fan to freeze. After the control is implemented, whether the fault is recovered or not can be detected at regular time, for example, the voltage is recovered to a normal range, which indicates that the problem of locked rotor is solved.
According to an embodiment of the third aspect of the present invention, there is also provided a control method of a refrigerator including a detection circuit of a refrigerator fan motor stalling, a display circuit, an alarm circuit, and a defrost circuit, the detection circuit including a current detection circuit, an amplification current, and a control circuit, the method comprising: the current detection circuit detects the current in the refrigerator fan motor driving circuit; the amplifying circuit amplifies the first voltage signal output by the current detection circuit to output an amplified second voltage signal; and the control circuit receives a second voltage signal output by the amplifying circuit and judges whether the motor of the refrigerator fan is locked according to the change of the second voltage signal.
According to the control method of the refrigerator, the current in the fan motor driving circuit is detected through the current detection circuit, the output voltage of the current detection circuit is amplified through the amplifying circuit, and therefore whether the motor of the refrigerator fan is locked or not is judged through judging the change of the voltage.
According to an embodiment of the present invention, the determining whether a motor of the refrigerator fan is locked according to a change of the second voltage signal specifically includes: judging whether the second voltage signal is increased instantly and then reduced; and when the second voltage signal is judged to be increased instantly and then reduced twice continuously, judging that the motor is locked.
According to the control method of the refrigerator, whether the motor is locked up or not is judged according to the change of the voltage signal, specifically, whether the voltage signal is increased instantly and then decreased is judged, and if the change is detected twice or more continuously, the motor is judged to be locked up.
According to an embodiment of the present invention, further comprising: when the control circuit judges that the motor is locked, the alarm circuit carries out alarm prompt according to the received alarm command sent by the control circuit.
According to the control method of the refrigerator provided by the embodiment of the invention, when the motor is locked, an alarm prompt can be given, so that abnormal refrigeration of the refrigerator is avoided.
According to an embodiment of the present invention, further comprising: and when the control circuit judges that the motor is locked, the display circuit displays according to the received fault display code of the motor locked, which is sent by the control circuit.
According to the control method of the refrigerator, provided by the embodiment of the invention, the alarm prompt is carried out, and the fault code can be displayed, so that a user can know the specific fault of the refrigerator conveniently to adopt corresponding processing operation.
According to an embodiment of the present invention, further comprising: and when the control circuit judges that the motor is locked, the defrosting circuit carries out defrosting operation according to the received defrosting command sent by the control circuit.
According to the control method of the refrigerator, the fan of the refrigerator is blocked, and the problem can be solved by defrosting due to the fact that the blades of the fan motor are blocked by ice with high probability. After the control is implemented, whether the fault is recovered or not can be detected at regular time, for example, the voltage is recovered to a normal range, which indicates that the problem of locked rotor is solved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the 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.
Fig. 1 shows a schematic configuration diagram of a detection circuit for detecting a fan motor stall of a refrigerator according to an embodiment of the present invention.
As shown in fig. 1, a detection circuit 100 for detecting a locked-rotor of a fan motor of a refrigerator according to an embodiment of the present invention includes: a current detection circuit 102, an input end of the current detection circuit 102 is connected to a driving circuit of a motor of the refrigerator fan, and detects a current passing through the motor driving circuit of the refrigerator fan; an input end of the amplifying circuit 104 is connected to an output end of the current detecting circuit 102, and the amplifying circuit 104 amplifies the first voltage signal output by the current detecting circuit 102 to output an amplified second voltage signal; and the control circuit 106 is connected to the amplifying circuit 104, receives the second voltage signal output by the amplifying circuit 104, and judges whether the motor of the refrigerator fan is locked according to the change of the second voltage signal.
According to the detection circuit for detecting the locked rotor of the fan motor of the refrigerator, the current flowing through the fan motor is detected through the current detection circuit, the output voltage of the current detection circuit is amplified through the amplifying circuit, and therefore whether the locked rotor of the motor of the fan of the refrigerator occurs or not is judged through judging the change of the voltage.
According to an embodiment of the present invention, the current detection circuit 102 includes: and one end of the current detection resistor is connected to the motor and the input end of the amplifying circuit, and the other end of the current detection resistor is grounded.
According to the detection circuit for the locked rotor of the fan motor of the refrigerator, the current in the motor can be detected by adopting the current detection resistor, so that the state of the motor can be judged according to the current in the motor.
According to an embodiment of the present invention, further comprising: the amplification circuit 104 includes: the positive input end of the operational amplifier is connected to the output end of the current detection circuit, the first resistor and the second resistor are connected between the output end of the operational amplifier and the ground in series, and the negative input end of the operational amplifier is connected to the common end of the first resistor and the second resistor.
According to the detection circuit for the refrigerator fan motor stalling, the amplifying circuit is composed of the operational amplifier, the first resistor and the second resistor, wherein the first resistor and the second resistor determine the amplification factor of the amplifying circuit, and different amplification factors can be adopted by adjusting the resistance values of the first resistor and the second resistor.
According to an embodiment of the present invention, further comprising: and the current limiting resistor is connected between the output end of the current detection circuit and the input end of the amplifying circuit and limits current entering the amplifying circuit.
According to the detection circuit for the refrigerator fan motor stalling, the current limiting resistor is connected between the current detection circuit and the amplifying circuit, so that the amplifying circuit is protected to a certain extent when the current in the motor is suddenly increased.
According to an embodiment of the present invention, further comprising: and the impedance matching resistor is connected between the output end of the amplifying circuit and the control circuit so as to match the impedance of the amplifying circuit and the control circuit.
According to the detection circuit for the locked rotor of the fan motor of the refrigerator, the impedance matching resistor is connected between the amplifying circuit and the control circuit, so that the voltage output by the amplifying circuit can be matched with the control circuit.
Fig. 2 illustrates a structural schematic view of a refrigerator according to an embodiment of the present invention.
As shown in fig. 2, a refrigerator according to an embodiment of the present invention includes: the detection circuit 100 for the locked rotor of the fan motor of the refrigerator in any one of the above technical schemes; and the alarm circuit 202 is connected to the control circuit 106 in the detection circuit for the refrigerator fan motor stalling, and carries out alarm prompt according to the received alarm command sent by the control circuit when the control circuit judges that the motor stalls.
According to the embodiment of the invention, the refrigerator comprises the detection circuit and the alarm circuit for the locked rotor of the fan motor of the refrigerator in the technical scheme, so that when the motor is locked, alarm prompt can be performed, and abnormal refrigeration of the refrigerator is avoided.
According to an embodiment of the present invention, further comprising: and the display circuit 204 is connected to the control circuit 106, and displays the motor stalling fault display code according to the received motor stalling fault display code sent by the control circuit when the control circuit 106 judges that the motor stalling occurs.
According to the refrigerator provided by the embodiment of the invention, the alarm prompt is carried out, and the fault code can be displayed, so that a user can conveniently know the specific fault of the refrigerator to adopt corresponding processing operation.
According to an embodiment of the present invention, further comprising: and the defrosting circuit 206 is connected to the control circuit 106, and performs defrosting operation according to the received defrosting command sent by the control circuit 106 when the control circuit 106 judges that the motor is locked.
According to the refrigerator provided by the embodiment of the invention, the fan and the fan of the refrigerator are blocked, and the problem can be solved by defrosting due to the fact that the blades of the fan and the fan are blocked by ice, at the moment, the refrigerator is subjected to forced defrosting operation, the defrosting exit temperature is increased by 10 degrees compared with the original temperature, the defrosting time is ensured to be long enough, and the excessive heat can melt the fan to freeze. After the control is implemented, whether the fault is recovered or not can be detected at regular time, for example, the voltage is recovered to a normal range, which indicates that the problem of locked rotor is solved.
Fig. 3 is a schematic flowchart of a control method of a refrigerator according to an embodiment of the present invention.
As shown in fig. 3, a control method of a refrigerator according to an embodiment of the present invention includes a detection circuit for detecting a locked-rotor of a fan motor of the refrigerator, a display circuit, an alarm circuit, and a defrost circuit, the detection circuit including a current detection circuit, an amplification current, and a control circuit, the control method including: step 302, the current detection circuit detects the current flowing through a driving circuit of a motor of the refrigerator fan; step 304, the amplifying circuit amplifies the first voltage signal output by the current detecting circuit to output an amplified second voltage signal; and step 306, the control circuit receives the second voltage signal output by the amplifying circuit, and judges whether the motor of the refrigerator fan is locked according to the change of the second voltage signal.
According to the control method of the refrigerator, the current flowing through the fan motor is detected through the current detection circuit, the output voltage of the current detection circuit is amplified through the amplifying circuit, and therefore whether the motor of the refrigerator fan is locked or not is judged through judging the change of the voltage.
According to an embodiment of the present invention, the determining whether a motor of the refrigerator fan is locked according to a change of the second voltage signal specifically includes: judging whether the second voltage signal is increased instantly and then reduced; and when the second voltage signal is judged to be increased instantly and then reduced twice continuously, judging that the motor is locked.
According to the control method of the refrigerator, whether the motor is locked up or not is judged according to the change of the voltage signal, specifically, whether the voltage signal is increased instantly and then decreased is judged, and if the change is detected twice or more continuously, the motor is judged to be locked up.
According to an embodiment of the present invention, further comprising: when the control circuit judges that the motor is locked, the alarm circuit carries out alarm prompt according to the received alarm command sent by the control circuit.
According to the control method of the refrigerator provided by the embodiment of the invention, when the motor is locked, an alarm prompt can be given, so that abnormal refrigeration of the refrigerator is avoided.
According to an embodiment of the present invention, further comprising: and when the control circuit judges that the motor is locked, the display circuit displays according to the received fault display code of the motor locked, which is sent by the control circuit.
According to the control method of the refrigerator, provided by the embodiment of the invention, the alarm prompt is carried out, and the fault code can be displayed, so that a user can know the specific fault of the refrigerator conveniently to adopt corresponding processing operation.
According to an embodiment of the present invention, further comprising: and when the control circuit judges that the motor is locked, the defrosting circuit carries out defrosting operation according to the received defrosting command sent by the control circuit.
According to the control method of the refrigerator, the fan of the refrigerator is blocked, and the problem can be solved by defrosting due to the fact that the blades of the fan motor are blocked by ice with high probability. After the control is implemented, whether the fault is recovered or not can be detected at regular time, for example, the voltage is recovered to a normal range, which indicates that the problem of locked rotor is solved.
The technical solution of the present invention is explained in detail below with reference to fig. 4 and 5.
Fig. 4 shows a circuit schematic diagram of a detection circuit for detecting a fan motor stall of a refrigerator according to an embodiment of the present invention.
As shown in FIG. 4, the resistor R05 is a current detection resistor, and is 10 Ω/2W. When the fan motor works normally, Ifan is the input current of the fan; when the rotating speed of the fan motor is abnormal or locked, the Ifan can be increased by 2-4 times. The operational amplifier IC01 of the invention adopts HA1630D04T with high speed conversion precision, and the calculation method of the amplification factor of the operational amplifier circuit is as follows:
Vout/Vin＝(R07+R08)/R07
the scheme of the invention adopts the amplification factor of an amplification circuit to be 5 (the range is 4-10 times), and the calculated R08 is 4R 07, and the scheme selects the R07 resistance value to be 2.5K and the R08 resistance value to be 10K, and the precision is 1%.
The voltage value is amplified by the operational amplifier IC01 and then output to the control circuit MCU, the control circuit determines the corresponding load work by detecting the change of the voltage value, and forced defrosting control or alarm is carried out after an abnormal feedback signal is detected, thereby avoiding the abnormal refrigeration of the refrigerator.
To ensure efficient operation of the fan, R05 is typically chosen to be relatively small when the sense resistor is selected, as shown in fig. 4, which is 10 ohms for example.
When the fan effectively operates, the fan end voltage occupies about 11V, and the R05 end voltage is about 1.02V. When the fan is locked, the instantaneous current is increased by about 1 time, so that the R05 generates an instantaneous voltage of about 2.85V, and then the R05 voltage is weakened to about 0.08V. According to the characteristics, the characteristic of the circuit is combined to be used as the characteristic for judging the abnormal locked rotor of the motor. In practical application, because the voltage is weak, the amplifying circuit is used, the amplified voltage value of the R105 is checked through the control circuit, and whether the fan motor is locked or not is judged according to the change process.
The following describes in detail the determination process of the fan motor stalling and the processing process when the motor stalls.
Fig. 5 is a detailed flowchart illustrating a control method of a refrigerator according to an embodiment of the present invention.
As shown in fig. 5, a specific flow of the control method of the refrigerator according to an embodiment of the present invention is as follows:
step 502, the control circuit continuously samples the output voltage Vout amplified by the current sampling resistor terminal.
Step 504, judging whether the output voltage Vout is increased instantly and then decreased suddenly, if so, entering step 506, otherwise, returning to step 502.
Step 506, when the output voltage Vout is increased instantaneously and then suddenly decreased continuously for 2 times, it is determined that the motor is locked.
And step 508, prompting the motor to block the rotor, sending an abnormal alarm prompt and displaying a fault code of the fault.
And 510, forcibly turning off the output control of the fan, wherein the refrigerator cannot run due to icing when the fan is blocked, executing a forced defrosting program, and increasing the defrosting temperature by 10 degrees compared with the conventional defrosting temperature.
And step 512, the control circuit controls the fan motor to operate and synchronously detects the feedback voltage.
And 514, re-detecting the voltage change trend, judging whether the locked rotor is generated, if so, entering the step 516, otherwise, returning to the step 508.
Step 516, return to normal control. And the normal control is the normal control of the refrigerator.
The technical scheme of the invention is explained in detail by combining the attached drawings, the current signal of the fan motor can be detected, and if the fan motor is abnormally locked, the control circuit of the refrigerator detects the abnormal feedback signal and then carries out forced defrosting control or alarm, thereby avoiding the occurrence of abnormal refrigeration of the refrigerator and causing unnecessary customer complaints.
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.