CN220772585U

CN220772585U - Refrigerator air door fault detection device and refrigerator

Info

Publication number: CN220772585U
Application number: CN202322237683.XU
Authority: CN
Inventors: 卢炳奇; 吴晓龙; 徐文涛; 郑培富
Original assignee: Hisense Refrigerator Co Ltd
Current assignee: Hisense Refrigerator Co Ltd
Priority date: 2023-08-18
Filing date: 2023-08-18
Publication date: 2024-04-12
Anticipated expiration: 2033-08-18

Abstract

The application provides a refrigerator air door fault detection device and refrigerator, detection device includes first sampling circuit and second sampling circuit. The first sampling circuit is connected to two ends of a first winding of the motor, and the second sampling circuit is connected to two ends of a second winding of the motor. The first sampling circuit comprises an MOS tube switching circuit and a voltage sampling circuit, the MOS tube switching circuit is connected with the first end of the first winding, and the voltage sampling circuit is connected with the second end of the first winding. The MOS tube switch circuit is configured to be conducted when the air door driving circuit does not work, the voltage sampling circuit comprises a sampling resistor, and the voltage sampling circuit is configured to collect voltages at two ends of the sampling resistor. The second sampling circuit has the same circuit structure as the first sampling circuit. According to the air door fault detection device, the first sampling circuit is connected to the two ends of the first winding, the second sampling circuit is connected to the two ends of the second winding, and therefore whether the air door has faults or not can be judged based on sampling results of the first sampling circuit and the second sampling circuit.

Description

Refrigerator air door fault detection device and refrigerator

Technical Field

The application relates to the technical field of electronic circuits, in particular to a refrigerator air door fault detection device and a refrigerator.

Background

For an air-cooled refrigerator, an evaporator is generally placed in a freezing chamber, a refrigerating chamber or a temperature changing chamber, and when refrigeration is needed, cold air in the freezing chamber is blown to a corresponding refrigerator chamber by opening an electric air door, so that the refrigeration is completed. When the other compartments do not need to be refrigerated, the electric throttle is closed.

At present, an electric air door driving device of the refrigerator is a motor, the motor has no feedback signal, open loop control is adopted, the air door state cannot be judged, and if the electric air door encounters a fault, self-checking cannot be completed, so that the refrigerator is abnormal in refrigeration.

It should be noted that the information disclosed in the foregoing background section is only for enhancing understanding of the background of the present application and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.

Disclosure of Invention

The embodiment of the application mainly aims to provide a refrigerator air door fault detection device and a refrigerator. The air door fault judging device aims at judging whether the air door has faults or not based on sampling results of the first sampling circuit and the second sampling circuit by connecting the first sampling circuit to two ends of a first winding of the motor and connecting the second sampling circuit to two ends of a second winding of the motor.

According to an aspect of an embodiment of the present application, there is provided a refrigerator damper fault detection device, where the refrigerator damper includes a damper motor, the damper motor includes a first winding and a second winding, the first winding and the second winding are both connected to a damper driving circuit, and the detection device includes a first sampling circuit and a second sampling circuit;

the first sampling circuit is connected to two ends of the first winding, and the second sampling circuit is connected to two ends of the second winding;

the first sampling circuit comprises an MOS tube switching circuit and a voltage sampling circuit, the MOS tube switching circuit is connected with the first end of the first winding, and the voltage sampling circuit is connected with the second end of the first winding;

the MOS tube switch circuit is configured to be conducted when the air door driving circuit does not work, the voltage sampling circuit comprises a sampling resistor, and the voltage sampling circuit is configured to collect voltages at two ends of the sampling resistor;

the second sampling circuit has the same circuit structure as the first sampling circuit.

In one embodiment of the present application, the MOS transistor switching circuit includes a first MOS transistor, a power supply voltage, a first resistor, and a second resistor;

the source electrode of the first MOS tube is connected with the first end of the first winding, the drain electrode of the first MOS tube is connected with the power supply voltage, and the grid electrode of the first MOS tube is connected with the first end of the first resistor;

the second end of the first resistor is connected with the air door driving circuit;

the first end of the second resistor is connected with the first end of the first resistor and then connected with the grid electrode of the first MOS tube, and the second end of the second resistor is connected with the power supply voltage and then connected with the drain electrode of the first MOS tube.

In one embodiment of the present application, the MOS transistor switching circuit further includes a first diode;

the first end of the first diode is connected with the first end of the first winding, and the second end of the first diode is connected with the source electrode of the first MOS tube.

In one embodiment of the present application, the voltage sampling circuit includes the sampling resistor, a voltage dividing resistor, a first capacitor, and a voltage acquisition device;

the voltage acquisition device is connected with the first end of the sampling resistor, and the second end of the sampling resistor is grounded;

the first end of the first capacitor is connected with the first end of the sampling resistor and then connected with the voltage acquisition device, and the second end of the first capacitor is connected with the second end of the sampling resistor and then grounded;

the first end of the voltage dividing resistor is connected with the second end of the first winding, and the second end of the voltage dividing resistor is connected with the first end of the sampling resistor.

In one embodiment of the present application, the first sampling circuit further includes:

the comparator is connected with the voltage sampling circuit and is used for comparing the voltage acquired by the voltage sampling circuit with the standard voltage and outputting a first control signal or a second control signal according to a comparison result;

and the buzzer driving circuit is connected with the comparator and used for driving the buzzer to give an alarm when receiving the first control signal.

In one embodiment of the present application, the buzzer driving circuit includes: the third resistor, the fourth resistor, the second MOS tube and the buzzer;

the first end of the third resistor is connected with the comparator, and the second end of the third resistor is connected with the grid electrode of the second MOS tube;

the drain electrode of the second MOS tube is connected with the first end of the buzzer, and the second end of the buzzer is connected with a power supply;

the source electrode of the second MOS tube is connected with the first end of the fourth resistor, and the second end of the fourth resistor is grounded.

In one embodiment of the present application, the buzzer driving circuit further includes a fifth resistor;

the first end of the fifth resistor is connected with the grid electrode of the second MOS tube, and the second end of the fifth resistor is connected with the second end of the fourth resistor.

In one embodiment of the present application, the detection device further includes:

the micro control unit is connected with the first sampling circuit and the second sampling circuit and is used for receiving a first voltage acquired by the first sampling circuit and a second voltage acquired by the second sampling circuit, detecting whether a refrigerator air door has a fault or not according to the first voltage and the second voltage, and sending a first level signal when detecting that the refrigerator air door has the fault;

and the buzzer circuit is connected with the micro control unit and is used for driving the buzzer to give an alarm when the first level signal is received.

In one embodiment of the present application, the buzzer circuit includes a sixth resistor, a triode, a second diode, and a buzzer;

the first end of the sixth resistor is connected with the first level signal, and the second end of the sixth resistor is connected with the base electrode of the triode;

the emitting electrode of the triode is grounded, and the collecting electrode of the triode is connected with the first end of the buzzer;

the first end of the second diode is connected between the collector electrode of the triode and the first end of the buzzer, and the second end of the second diode is grounded;

and the second end of the buzzer is connected with an external power supply.

To achieve the above object, a second aspect of the embodiments of the present application proposes a refrigerator including the detection device described in the first aspect.

In the technical scheme that this application embodiment provided, the air door motor includes first winding and second winding, and first winding and second winding all are connected with air door drive circuit, and detection device includes first sampling circuit and second sampling circuit. The first sampling circuit is connected to two ends of the first winding, and the second sampling circuit is connected to two ends of the second winding. The first sampling circuit comprises an MOS tube switching circuit and a voltage sampling circuit, the MOS tube switching circuit is connected with the first end of the first winding, and the voltage sampling circuit is connected with the second end of the first winding. The MOS tube switch circuit is configured to be conducted when the air door driving circuit does not work, the voltage sampling circuit comprises a sampling resistor, and the voltage sampling circuit is configured to collect voltages at two ends of the sampling resistor. The second sampling circuit has the same circuit structure as the first sampling circuit. According to the air door fault detection device, the first sampling circuit is connected to the two ends of the first winding, the second sampling circuit is connected to the two ends of the second winding, and therefore whether the air door has faults or not can be judged based on sampling results of the first sampling circuit and the second sampling circuit.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a schematic block diagram of a refrigerator damper fault detection device provided in an embodiment of the present application;

FIG. 2 is a schematic block diagram of a first sampling circuit provided by an embodiment of the present application;

fig. 3 is a circuit diagram of a first sampling circuit provided in an embodiment of the present application;

FIG. 4 is another schematic block diagram of a first sampling circuit provided by an embodiment of the present application;

fig. 5 is a circuit diagram of a buzzer driving circuit provided in an embodiment of the present application;

FIG. 6 is another schematic block diagram of a refrigerator damper fault detection device provided in an embodiment of the present application;

fig. 7 is a circuit diagram of a buzzer circuit provided in an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

It should be noted that although functional block division is performed in a device diagram and a logic sequence is shown in a flowchart, in some cases, the steps shown or described may be performed in a different order than the block division in the device, or in the flowchart. The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the present application.

In the modern household appliance industry, the functions of remote control, data collection, fault alarm, program upgrading and the like of the household appliances are realized by adopting the remote communication means of the Internet of things, and are trends of intelligent household appliance development. Along with the increasing maturity of intelligent house market, the intellectuality of refrigerator has brought brand-new life experience for the user.

Refrigerators have become necessary home appliances for many households, and with the progress of technology, users have increasingly higher requirements on the performance of the refrigerators. For an air-cooled refrigerator, an evaporator is generally placed in a freezing chamber, a refrigerating chamber or a temperature changing chamber, and when refrigeration is needed, cold air in the freezing chamber is blown to a corresponding refrigerator chamber by opening an electric air door, so that the refrigeration is completed. When the other compartments do not need to be refrigerated, the electric throttle is closed.

The problems that the air door is invalid, the temperature of the refrigerating room is too cold, things are frozen out or the freezing effect cannot be achieved are frequently encountered in the using process of the refrigerator. For example, the air door is in a closed state all the time due to the failure of the air door, and at this time, the cold air of the freezing chamber cannot reach the refrigerating chamber, so that the purpose of cooling cannot be achieved. Or the air door is invalid so that the air door is always in an open state, at the moment, cold air in the freezing chamber is always blown to the refrigerating chamber, so that the refrigerating chamber is supercooled and the temperature of the freezing chamber cannot reach the set temperature. Thereby greatly affecting the performance of the refrigerator.

Based on this, the embodiment of the application provides a refrigerator air door fault detection device, and aims to judge whether an air door has faults or not based on sampling results of a first sampling circuit and a second sampling circuit by connecting the first sampling circuit to two ends of a first winding of a motor and connecting the second sampling circuit to two ends of a second winding of the motor.

Referring to fig. 1, fig. 1 is a schematic block diagram of a refrigerator damper fault detection apparatus provided in an embodiment of the present application. As shown in fig. 1, the refrigerator damper includes a damper motor 10, the damper motor 10 includes a first winding 11 and a second winding 12, the first winding 11 and the second winding 12 are connected with a damper driving circuit 20, and the detecting device includes a first sampling circuit 30 and a second sampling circuit 40. The first sampling circuit 30 is connected to two ends of the first winding 11, and the second sampling circuit 40 is connected to two ends of the second winding 12.

Referring to fig. 2, fig. 2 is a schematic block diagram of a first sampling circuit provided in an embodiment of the present application, and as shown in fig. 2, a first sampling circuit 30 includes a MOS transistor switch circuit 31 and a voltage sampling circuit 32, where the MOS transistor switch circuit 31 is connected to a first end of the first winding 11, and the voltage sampling circuit 32 is connected to a second end of the first winding 11.

Wherein, MOS tube switch circuit 31 is configured to switch on when throttle drive circuit 20 is not working, and voltage sampling circuit 32 includes sampling resistance, and voltage sampling circuit 32 is configured to gather the voltage of sampling resistance both ends.

In this embodiment, since the second sampling circuit 40 has the same circuit structure as the first sampling circuit 30, the description thereof is omitted.

In this embodiment of the present application, since the MOS transistor switch circuit 31 is configured to be turned on when the damper driving circuit 20 does not work, the first sampling circuit 30 may collect the voltages at two ends of the sampling resistor through the voltage sampling circuit 32 when the damper driving circuit 20 does not work, so as to determine whether there is a fault in the connection circuit between the first winding 11 and the damper driving circuit 20 according to the collected voltage value, so as to cause the damper to fail. Similarly, since the second sampling circuit 40 has the same circuit structure as the first sampling circuit 30, the voltage at both ends of the sampling resistor can be acquired by the voltage sampling circuit 32 when the damper driving circuit 20 does not operate, so that it can be determined whether a fault exists in the connection circuit between the second winding 12 and the damper driving circuit 20 according to the acquired voltage value to cause the damper to fail.

It should be noted that, based on the two-phase bipolar driving principle of the electric damper, if at least one of the connection circuit between the first winding 11 and the damper driving circuit 20 and the connection circuit between the second winding 12 and the damper driving circuit 20 has a fault, the electric damper of the refrigerator will fail, i.e. the damper driving circuit 20 will not normally drive the electric damper to open or close.

In one embodiment of the present application, referring to fig. 3, fig. 3 is a circuit diagram of a first sampling circuit provided in an embodiment of the present application. As shown in fig. 3, the first sampling circuit 30 includes a MOS transistor switching circuit 31 and a voltage sampling circuit 32. The MOS transistor switch circuit 31 is connected to a first end of the first winding RX, and the voltage sampling circuit 32 is connected to a second end of the first winding RX. The MOS transistor switching circuit 31 includes a first MOS transistor Q1, a power supply voltage VCC, a first resistor R1, and a second resistor R2. The source electrode S of the first MOS tube Q1 is connected with the first end of the first winding RX, the drain electrode D of the first MOS tube Q1 is connected with the power supply voltage VCC, and the grid electrode G of the first MOS tube Q1 is connected with the first end of the first resistor R1. A second end of the first resistor R1 is connected to the damper driving circuit 20. The first end of the second resistor R2 is connected with the first end of the first resistor R1 and then connected with the grid G of the first MOS tube Q1, and the second end of the second resistor R2 is connected with the power supply voltage VCC and then connected with the drain D of the first MOSQ1 tube.

In this embodiment, the second end of the first resistor R1 is connected to the damper driving circuit 20 to access the signal check-a-con output by the damper driving circuit 20. When the damper driving circuit 20 is not operating, the signal check-a-con output by the damper driving circuit 20 is a low level signal, and is at a high level due to the power supply voltage VCC to which the drain D of the first MOS transistor Q1 is connected, so that the first MOS transistor Q1 is turned on. When the damper driving circuit 20 is operating normally, the signal check-a-con output from the damper driving circuit 20 is a high level signal, and the power supply voltage VCC applied to the drain D of the first MOS transistor Q1 is at a high level, so that the first MOS transistor Q1 cannot be turned on. That is, by setting the MOS transistor switch circuit 31, the first sampling circuit 30 can be controlled to sample when the damper driving circuit 20 is not operating, but not when the damper driving circuit 20 is operating normally.

In one embodiment of the present application, referring to fig. 3, the mos transistor switching circuit 31 further includes a first diode D1. The first end of the first diode D1 is connected with the first end of the first winding RX, and the second end of the first diode D1 is connected with the source electrode S of the first MOS transistor Q1. As shown in fig. 3, the first diode D1 is connected between the first MOS transistor Q1 and the first winding RX, so that when the damper driving circuit 20 operates normally, the circuit is prevented from being damaged due to reverse voltage through the first diode D1, and the protection circuit can be implemented.

In one embodiment of the present application, referring to fig. 3, the voltage sampling circuit 32 includes a sampling resistor R12, a voltage dividing resistor R10, a first capacitor C1, and a voltage acquisition device 321;

the voltage acquisition device 321 is connected with the first end of the sampling resistor R12, and the second end of the sampling resistor R12 is grounded. The first end of the first capacitor C1 is connected with the first end of the sampling resistor R12 and then connected with the voltage acquisition device 321, and the second end of the first capacitor C1 is connected with the second end of the sampling resistor R12 and then grounded. The first end of the voltage dividing resistor R10 is connected to the second end of the first winding RX, and the second end of the voltage dividing resistor R10 is connected to the first end of the sampling resistor R12.

In this embodiment, the voltage acquisition device 321 is disposed at two ends of the sampling resistor R12, and is configured to acquire voltages at two ends of the sampling resistor R12. So that it can be determined whether there is a fault in the connection circuit between the first winding RX and the damper driving circuit 20 according to the voltage across the sampling resistor R12. Specifically, the voltage across resistor R12 is sampledSince the voltage dividing resistor R10 and the sampling resistor R12 are fixed resistors, the first winding RX has small variation in normal operation, and therefore, if there is no failure in the connection circuit between the first winding RX and the damper driving circuit 20, the sampling voltage V _Check-A The voltage fluctuates up and down within a smaller preset range and is closer to the corresponding sampling voltage value of the first winding RX which is fixed and unchanged. When there is a fault in the connection circuit between the first winding RX and the damper drive circuit 20, for example, when there is an abnormality in the first winding RX, that is, the first winding RX fluctuates greatly, the voltage V is sampled _Check-A Will deviate from the preset range, i.e. be outside the preset range. Or when there is a break in the connection circuit between the first winding RX and the damper drive circuit 20, such as a blow-out of the first winding RX or a disconnection of the connection line between the first winding RX and the damper drive circuit 20, the voltage V is sampled _Check-A Will be 0. That is, the voltage V across the sampling resistor R12 acquired by the judgment voltage acquisition means 321 _Check-A Whether or not the connection circuit between the first winding RX and the damper drive circuit 20 is in the preset range and whether or not it is 0 can be judged.

It should be noted that, after the power supply voltage VCC passes through the first MOS transistor Q1 and the first diode D1, the voltage should be reduced, that is, the voltage across the sampling resistor R12 calculated by the power supply voltage VCC is not accurate enough and may be slightly larger. However, in the embodiment of the present application, whether the first winding RX is abnormal is determined by determining whether the voltages at the two ends of the sampling resistor R12 fluctuate within a preset range, so that the final determination result may not be affected by properly adjusting the preset range, for example, properly adjusting the preset range entirely.

In one embodiment of the present application, referring to fig. 4, fig. 4 is another schematic block diagram of a first sampling circuit provided by an embodiment of the present application. As shown in fig. 4, the first sampling circuit 30 includes a MOS transistor switching circuit 31, a voltage sampling circuit 32, a comparator 33, and a buzzer driving circuit 34. The MOS transistor switch circuit 31 is connected to a first end of the first winding 11, and the voltage sampling circuit 32 is connected to a second end of the first winding 11. The comparator 33 is connected to the voltage sampling circuit 32, and the buzzer driving circuit 34 is connected to the comparator 33. The comparator 33 is configured to compare the voltage acquired by the voltage sampling circuit 32 with a standard voltage, and output a first control signal or a second control signal according to the comparison result. The buzzer driving circuit 34 is configured to drive the buzzer to generate an alarm when receiving the first control signal.

The comparator 33 is for comparing the voltage acquired by the voltage sampling circuit 32 with a standard voltage, and outputting a first control signal when the absolute value of the difference between the voltage acquired by the voltage sampling circuit 32 and the standard voltage is not within a preset range, wherein the first control signal may be a high level signal or a low level signal. And when the absolute value of the difference between the voltage acquired by the voltage sampling circuit 32 and the standard voltage is within the preset range, a second control signal is output, and the second control signal can also be a high level signal or a low level signal.

In this embodiment, the comparator 33 is connected to the voltage sampling circuit 32, so that the comparator 33 can compare the voltage acquired by the voltage sampling circuit 32 with the standard voltage, and output the first control signal or the second control signal according to the comparison result. The buzzer driving circuit 34 is connected with the comparator 33, so that the buzzer driving circuit 34 can drive the buzzer to give an alarm when receiving the first control signal. An alarm may be issued upon detecting a failure of the connection between the first winding 11 and the damper drive circuit 20 to alert the user.

In an embodiment of the present application, referring to fig. 5, fig. 5 is a circuit diagram of a buzzer driving circuit provided in an embodiment of the present application, and as shown in fig. 5, the buzzer driving circuit includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a second MOS transistor Q2, and a buzzer Speaker1. The first end of the third resistor R3 is connected with the comparator, and the second end of the third resistor R3 is connected with the grid G of the second MOS tube Q2. The drain D of the second MOS transistor Q2 is connected with the first end of the buzzer Speaker1, and the second end of the buzzer Speaker1 is connected with the power supply VCC. The source electrode S of the second MOS tube Q2 is connected with the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is grounded. The first end of the fifth resistor R5 is connected with the grid G of the second MOS tube Q2, and the second end of the fifth resistor R5 is connected with the second end of the fourth resistor R4.

In this embodiment, the buzzer driving circuit 34 is connected to the comparator 33 by setting the first end of the third resistor R3, and is capable of receiving the first control signal 1QR sent by the comparator 33. Specifically, when the comparator detects that the absolute value of the difference between the voltage acquired by the voltage sampling circuit 32 and the standard voltage is not within the preset range, the first control signal 1QR output by the comparator 33 is at a high level, and at this time, the second MOS transistor Q2 is turned on, so that the buzzer 1 sounds an alarm. Thereby reminding the user of the failure of the electric damper.

In the embodiment of the present application, referring to fig. 6, fig. 6 is another schematic block diagram of the refrigerator damper fault detection apparatus provided in the embodiment of the present application. As shown in fig. 6, the refrigerator damper includes a damper motor 10, the damper motor 10 includes a first winding 11 and a second winding 12, the first winding 11 and the second winding 12 are connected with a damper driving circuit 20, and the detecting device includes a first sampling circuit 30, a second sampling circuit 40, a micro control unit 50 and a buzzer circuit 60. The first sampling circuit 30 is connected to two ends of the first winding 11, and the second sampling circuit 40 is connected to two ends of the second winding 12. The micro control unit 50 is connected to the first sampling circuit 30 and the second sampling circuit 40. The buzzer circuit 60 is connected to the micro control unit 50.

The micro control unit 50 is configured to receive the first voltage acquired by the first sampling circuit 30 and the second voltage acquired by the second sampling circuit 40, detect whether the refrigerator damper has a fault according to the first voltage and the second voltage, and send out a first level signal when detecting that the refrigerator damper has a fault. The buzzer circuit 60 is used for driving the buzzer to give an alarm when receiving the first level signal.

In this embodiment, the micro control unit 50 is connected to the first sampling circuit 30 and the second sampling circuit 40, so that the micro control unit 50 can obtain the first voltage collected by the first sampling circuit 30 and obtain the second voltage collected by the second sampling circuit 40. And comparing the first voltage with the standard voltage respectively to judge whether the absolute value of the difference value of the first voltage and the standard voltage is in a preset range. Comparing the second voltage with the standard voltage to judge whether the absolute value of the difference value between the second voltage and the standard voltage is within a preset range. When the absolute value of the difference between the first voltage and the standard voltage is within the preset range and the absolute value of the difference between the second voltage and the standard voltage is within the preset range, it is determined that the electric damper has no fault, a second level signal is output to the buzzer circuit 60, and the buzzer circuit 60 receives the second level signal and does not drive the buzzer. And when the absolute value of the difference between the first voltage and the standard voltage is not in the preset range, or the absolute value of the difference between the second voltage and the standard voltage is not in the preset range, determining that the electric air door has a fault, outputting a first level signal to the buzzer circuit 60, and driving the buzzer to give an alarm after the buzzer circuit 60 receives the first level signal. That is, by the arrangement of the detecting means, an alarm can be given to alert the user when a failure of at least one of the connection circuit between the first winding 11 and the damper drive circuit 20 and the connection circuit between the second winding 12 and the damper drive circuit 20 is detected.

In one embodiment of the present application, referring to fig. 7, fig. 7 is a circuit diagram of a buzzer circuit provided in an embodiment of the present application. As shown in fig. 7, the buzzer circuit includes a sixth resistor R6, a transistor Q3, a second diode D2, and a buzzer SPKR1. The first end of the sixth resistor R6 is connected to the first level signal, and the second end of the sixth resistor R6 is connected to the base b of the triode Q3. The emitter e of the triode Q3 is grounded, and the collector c of the triode Q3 is connected with the first end of the buzzer SPKR1. The first end of the second diode D2 is connected between the collector c of the transistor Q3 and the first end of the buzzer SPKR1, and the second end of the second diode D2 is grounded. The second end of the buzzer SPKR1 is connected with an external power supply VCC.

Referring to fig. 7, the buzzer driving circuit further includes a second capacitor C2 and a seventh resistor R7, a third capacitor C3 and an eighth resistor R8. The first end of the second capacitor C2 is connected with the second end of the sixth resistor R6 and then connected with the base b of the triode Q3, and the second end of the second capacitor C2 is connected with the emitter e of the triode Q3 and then connected with the ground DGND. The first end of the seventh resistor R7 is connected to the first end of the second capacitor C2, and the second end of the seventh resistor R7 is connected to the second end of the second capacitor C2. The first end of the third capacitor C3 is connected to the second end of the second diode D2, and the second end of the third capacitor C3 is grounded. The first end of the eighth resistor R8 is connected to the second end 1 of the buzzer SPKR1, and the second end of the eighth resistor R8 is connected to the external power source VCC.

In this embodiment, when the micro control unit 50 detects that the electric damper has a fault, the micro control unit outputs a first level signal to the first end of the sixth resistor R6, and drives the triode Q3 to open by sending a fixed frequency, so that the buzzer SPKR1 sends out a harshness alarm to prompt the user that the electric damper fails.

The embodiment of the application also provides a refrigerator, which comprises the refrigerator air door fault detection device provided by any embodiment of the application.

Because the refrigerator provided by the embodiment of the application comprises the refrigerator air door fault detection device provided by any embodiment of the application, the refrigerator provided by the application automatically detects when the electric air door has faults, and timely finds that the air door fails.

The embodiments described in the embodiments of the present application are for more clearly describing the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application, and as those skilled in the art can know that, with the evolution of technology and the appearance of new application scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

It will be appreciated by those skilled in the art that the technical solutions shown in the figures do not constitute limitations of the embodiments of the present application, and may include more or fewer steps than shown, or may combine certain steps, or different steps.

The above described apparatus embodiments are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Those of ordinary skill in the art will appreciate that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof.

The terms "first," "second," "third," "fourth," and the like in the description of the present application and in the above-described figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be understood that in this application, "at least one" means one or more, and "a plurality" means two or more. "and/or" for describing the association relationship of the association object, the representation may have three relationships, for example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the above-described division of units is merely a logical function division, and there may be another division manner in actual implementation, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Preferred embodiments of the present application are described above with reference to the accompanying drawings, and thus do not limit the scope of the claims of the embodiments of the present application. Any modifications, equivalent substitutions and improvements made by those skilled in the art without departing from the scope and spirit of the embodiments of the present application shall fall within the scope of the claims of the embodiments of the present application.

Claims

1. The refrigerator air door fault detection device is characterized by comprising an air door motor, wherein the air door motor comprises a first winding and a second winding, the first winding and the second winding are connected with an air door driving circuit, and the detection device comprises a first sampling circuit and a second sampling circuit;

2. The detection device of claim 1, wherein the MOS transistor switching circuit comprises a first MOS transistor, a supply voltage, a first resistor, and a second resistor;

3. The detection apparatus according to claim 2, wherein the MOS transistor switching circuit further includes a first diode;

4. The detection device of claim 1, wherein the voltage sampling circuit comprises the sampling resistor, a voltage dividing resistor, a first capacitor, and a voltage acquisition device;

5. The detection apparatus according to claim 1, wherein the first sampling circuit further comprises:

6. The detecting device according to claim 5, wherein the buzzer driving circuit includes: the third resistor, the fourth resistor, the second MOS tube and the buzzer;

7. The detection apparatus according to claim 6, wherein the buzzer driving circuit further includes a fifth resistor;

8. The detection apparatus according to claim 1, characterized in that the detection apparatus further comprises:

9. The detection device of claim 8, wherein the buzzer circuit includes a sixth resistor, a triode, a second diode, and a buzzer;

and the second end of the buzzer is connected with an external power supply.

10. A refrigerator comprising the detection device according to any one of claims 1 to 9.