Refrigerator

Abstract

The embodiment of the invention belongs to the technical field of household appliances, and provides a refrigerator which comprises a refrigerator body provided with a storage chamber, a refrigerating system arranged in the refrigerator body, a fan feedback circuit and a main control board, the main control board comprises a signal processing circuit and a main controller, the main controller is configured to send a control signal to the signal processing circuit, and the signal processing circuit sends the control signal to the fan feedback circuit. The signal processing circuit is configured to determine a first resistor of the fan feedback circuit and a second resistor connected to the signal processing circuit according to the received control signal, so that the resistor suitable for the current fan is automatically matched, and the fan feedback circuit feeds back the running state of the fan to the main controller through the signal processing circuit; and manual resistance matching is not needed during development, so that the development efficiency is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of household appliance technology, and more specifically, to a refrigerator. Background Art

[0002] As the functions of refrigerator products become more complex and diversified, the control systems of refrigerators become more complex. More and more refrigerators are equipped with fans, which are usually equipped with corresponding fan feedback circuits that can be used to feedback the operating status of the fans.

[0003] Different specifications and models of fans are used for different types of refrigerators. However, due to the different specifications and models of fans, the resistance required in the fan feedback circuit and the related circuits connected to the fan feedback circuit in the main control board are different. Manual matching is required according to the specifications and models of the fans, which makes the development efficiency low. Summary of the invention

[0004] The embodiment of the present application provides a refrigerator that can be used to solve the problem in the related art that manual matching is performed according to the specifications and models of the fan, resulting in low development efficiency.

[0005] In a first aspect, an embodiment of the present application provides a refrigerator, comprising:

[0006] A box body, wherein a storage room is arranged in the box body;

[0007] The refrigeration system disposed in the box includes a compressor, an evaporator and a fan, wherein the compressor is used to provide power for the refrigeration cycle of the refrigerator, and the fan is used to allow air to enter the evaporator of the refrigerator for heat exchange and send the heat-released air into the storage room;

[0008] a fan feedback circuit connected to the fan and configured to detect an operating state of the fan;

[0009] The main control board comprises:

[0010] a signal processing circuit connected to the fan feedback circuit, configured to determine a first resistor of the fan feedback circuit and a second resistor connected to the signal processing circuit according to a received control signal, so that the fan feedback circuit feeds back the operating status to the main controller through the signal processing circuit;

[0011] A main controller connected to the signal processing circuit and the fan respectively is configured to send the control signal to the signal processing circuit.

[0012] In this embodiment, the refrigerator includes a box body with a storage room, a refrigeration system arranged in the box body, a fan feedback circuit and a main control board, wherein the main control board includes a signal processing circuit and a main controller, the main controller is configured to send a control signal to the signal processing circuit, the signal processing circuit is configured to determine the first resistor of the fan feedback circuit and the second resistor connected to the signal processing circuit according to the received control signal, so as to automatically match the resistance suitable for the current fan, so that the fan feedback circuit can feedback the operating status of the fan to the main controller through the signal processing circuit, and there is no need to manually perform resistance matching during development, thereby improving development efficiency.

[0013] In some embodiments of the present application, the signal processing circuit includes a first analog switch and a first multiplexer; the first analog switch is connected to the fan feedback circuit through a first connecting line, the first multiplexer is connected to the first connecting line, the first multiplexer includes a plurality of first candidate resistors and a switch corresponding to each first candidate resistor, for any switch, the switch is used to control whether the corresponding first candidate resistor is connected to the signal processing circuit, wherein the resistance values ​​of the plurality of first candidate resistors are different;

[0014] The control signal includes a first signal, a second signal and a third signal;

[0015] The main controller is configured as follows:

[0016] When the main control board is initially powered on, the first signal is sent to the first analog switch, wherein the first signal is used to control the first analog switch to be disconnected, so as to disconnect the fan feedback circuit and the signal processing circuit;

[0017] Sending the second signal to the fan, wherein the second signal is used to instruct to start the fan;

[0018] Sending the third signal to the first multiplexer, wherein the third signal is used to instruct the plurality of first candidate resistors to be connected to the signal processing circuit in sequence, and sending a first feedback signal to the main controller when the currently connected first candidate resistor is connected;

[0019] The first resistance is determined according to the first feedback signal.

[0020] In this embodiment, the main controller determines the first resistance of the fan feedback circuit by controlling an analog switch and a multiplexer.

[0021] In some embodiments of the present application, the signal processing circuit further includes a second analog switch and a second multiplexer; the second analog switch is connected to the first analog switch through a second connecting line, the second multiplexer is connected to the second connecting line, the second multiplexer includes a plurality of second candidate resistors and a switch corresponding to each second candidate resistor, and for any switch, the switch is used to control whether the corresponding second candidate resistor is connected to the signal processing circuit, wherein the resistance values ​​of the plurality of second candidate resistors are different;

[0022] The control signal also includes a fourth signal, a fifth signal and a sixth signal;

[0023] The main controller is configured as follows:

[0024] Sending the fourth signal to the first analog switch, wherein the fourth signal is used to control the first analog switch to be turned on, so that the fan feedback circuit and the signal processing circuit are turned on;

[0025] sending the fifth signal to the second analog switch, wherein the fifth signal is used to control the second analog switch to be disconnected, so as to disconnect the fan feedback circuit and the signal processing circuit;

[0026] sending the sixth signal to the second multiplexer, the sixth signal being used to instruct the plurality of second candidate resistors to be connected to the signal processing circuit in sequence, and sending a second feedback signal to the main controller when the currently connected second candidate resistor is connected;

[0027] The second resistance is determined according to the second feedback signal.

[0028] In this embodiment, after determining the first resistor of the fan feedback circuit, the main controller determines the second resistor required by the signal processing circuit by controlling an analog switch and a multiplexer.

[0029] In some embodiments of the present application, the main controller is configured as follows:

[0030] determining a signal voltage value of the second feedback signal;

[0031] It is determined whether the currently connected second candidate resistor is the second resistor according to the signal voltage value and the target voltage.

[0032] In this embodiment, the second resistor may be determined according to the signal voltage value of the second feedback signal.

[0033] In some embodiments of the present application, the main controller is configured as follows:

[0034] Determine a first difference between the signal voltage value and the target voltage;

[0035] Determining whether the first difference is less than a preset threshold;

[0036] If so, it is determined that the currently connected second candidate resistor is the second resistor.

[0037] In this embodiment, when the signal voltage value is closer to the preset target voltage, the resistor corresponding to the target voltage value is determined to be the second resistor.

[0038] In some embodiments of the present application, the target voltage is a voltage value corresponding to a preset ratio of the input voltage of the main control board.

[0039] In this embodiment, the preset target voltage may be a voltage value corresponding to a preset proportion of the input voltage of the main control board, so that the second resistor connected to the signal processing circuit can effectively open the switch in the signal processing circuit.

[0040] In some embodiments of the present application, if the currently connected second candidate resistor is the second resistor, the main controller is configured as follows:

[0041] Sending a seventh signal to the first analog switch and the second analog switch, wherein the seventh signal is used to control the first analog switch and the second analog switch to be turned on, so that the fan feedback circuit is connected to the signal processing circuit;

[0042] An eighth signal is sent to the second multiplexer, where the eighth signal is used to control the second multiplexer to be turned on, and to turn on the path where the currently connected second candidate resistor is located, so that the currently connected second candidate resistor is connected to the signal processing circuit.

[0043] In this embodiment, after determining the second resistor, the main controller may control the two analog switches to be turned on, and control the second multiplexer to turn on the path of the matching resistor, so that the resistor is connected to the signal processing circuit.

[0044] In some embodiments of the present application, the signal processing circuit further includes a third resistor, a fourth resistor, a first switch, a fifth resistor, a sixth resistor and a first capacitor;

[0045] The first end of the first capacitor is connected to the second connecting line;

[0046] A first end of the third resistor is connected to the second analog switch, a second end of the third resistor is connected to the first switch through a third connection line, a first end of the fourth resistor is connected to the third connection line, a second end of the fourth resistor is connected to the first switch through a fourth connection line, and a second end of the first capacitor is connected to the fourth connection line;

[0047] The fifth resistor is connected to the first switch via a fifth connecting line, a first end of the sixth resistor is connected to the fifth connecting line, and a second end of the sixth resistor is connected to the main controller.

[0048] In this embodiment, the operating status of the fan fed back by the fan feedback circuit can be transmitted to the main controller through the signal processing circuit.

[0049] In some embodiments of the present application, the fan feedback circuit includes a seventh resistor, an eighth resistor, a second switch and a second capacitor;

[0050] The second switch is connected to the fan, the second switch is connected to the seventh resistor through the sixth connecting line, the first end of the eighth resistor is connected to the sixth connecting line, the second end of the eighth resistor is connected to the first analog switch through the seventh connecting line, the first end of the second capacitor is connected to the seventh connecting line, and the second end of the second capacitor is respectively connected to the second switch and the first capacitor.

[0051] In this embodiment, the operating status of the fan can be monitored through the fan feedback circuit.

[0052] In a second aspect, the present application provides a refrigerator, comprising:

[0053] A box body, wherein a storage room is arranged in the box body;

[0054] The refrigeration system disposed in the box includes a compressor, an evaporator and a fan, wherein the compressor is used to provide power for the refrigeration cycle of the refrigerator, and the fan is used to allow air to enter the evaporator of the refrigerator for heat exchange and send the heat-released air into the storage room;

[0055] a fan feedback circuit connected to the fan and configured to detect an operating state of the fan;

[0056] A main control board connected to the fan, the main control board comprising:

[0057] a signal processing circuit connected to the fan feedback circuit;

[0058] The main controller connected to the signal processing circuit is configured to: control multiple alternative resistors to be connected to the signal processing circuit in sequence to determine the resistor matching the fan, so that the fan feedback circuit can feedback the operating status to the main controller through the signal processing circuit.

[0059] In this embodiment, the main control board includes a signal processing circuit connected to the fan feedback circuit and a main controller connected to the signal processing circuit. The main controller is configured to control multiple alternative resistors to be connected to the signal processing circuit in sequence to determine the resistance that matches the fan, so that the fan feedback circuit can feedback the operating status of the fan to the main controller through the signal processing circuit, thereby automatically matching the resistance suitable for the current fan, eliminating the need for manual resistance matching during development, and improving development efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the implementation methods in the embodiments of the present application or the related technologies, the following is a brief introduction to the drawings required for use in the embodiments or the related technology descriptions. Obviously, the drawings described below are some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0061] Figure 1 A structural schematic diagram of an existing fan feedback circuit as an example of this application;

[0062] Figure 2 A schematic diagram of the structure of a refrigerator provided in this application;

[0063] Figure 3 A schematic diagram of the structure of a fan feedback circuit 104 and a main control board 105 provided in an embodiment of the present application;

[0064] Figure 4 A schematic diagram of a first multiplexer as an example of the present application;

[0065] Figure 5 A schematic diagram of the structure of a fan feedback circuit 104 and a main control board 105 provided in an embodiment of the present application;

[0066] Figure 6 A circuit structure diagram of a signal processing circuit 51 provided in an embodiment of the present application;

[0067] Figure 7 A schematic diagram of the structure of a fan feedback circuit 104 provided in an embodiment of the present application;

[0068] Figure 8 A schematic diagram of the circuit structure of a fan feedback circuit 104 and a main control board 105 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0069] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0070] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0071] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components expressly listed but may include other components not expressly listed or inherent to such products or devices.

[0072] As the utilization rate of fans increases, in order to better control the fans, refrigerators are usually equipped with corresponding fan feedback circuits, which can be used to feedback the operating status of the fans, such as the actual speed of the fans. If the actual speed is lower than the ideal speed, the speed of the fan can be controlled to increase to meet the refrigeration needs of the refrigerator.

[0073] Since different types of refrigerators use fans of different specifications and models, and different specifications and models of fans result in different resistances required in the fan feedback circuit and related circuits in the main control board connected to the fan feedback circuit, manual matching is required based on the specifications and models of the fan, resulting in low development efficiency.

[0074] At present, the structures of fan feedback circuits are roughly the same, but there are different differences, such as different pull-up resistors or output resistors. Figure 1 The structural diagram of an existing fan feedback circuit is shown as an example in this application. Figure 1 As shown, for fans of different specifications or models, the resistance R1 and resistance R2 of the fan feedback circuit are different, and one or more of the resistances R3, R4 and R5 on the main control board also have differences, among which the main difference is R3, so it is necessary to manually match them according to the specifications and models of the fan, which makes the development efficiency low.

[0075] Therefore, the present application provides a refrigerator in which a main controller controls multiple alternative resistors to be connected to a main control board in sequence to determine a resistor that matches the fan, thereby automatically matching a resistor suitable for the current fan. This eliminates the need for manual resistor matching during development, thereby improving development efficiency.

[0076] In the embodiment of the present application, the plurality of candidate resistors may include a plurality of first candidate resistors and a plurality of second candidate resistors.

[0077] The technical solution of the present application is described in detail below in conjunction with specific embodiments. The following specific embodiments can be combined with each other or exist independently. The same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0078] Figure 2 A schematic diagram of the structure of a refrigerator provided in this application, such as Figure 2 As shown, the refrigerator includes a cabinet 101, a storage chamber 102 arranged in the cabinet 101, a refrigeration system 103 arranged in the cabinet 101, a fan feedback circuit 104 connected to the fan 31 in the refrigeration system 103, and a main control board 105.

[0079] Among them, the refrigeration system 103 includes a compressor 32, an evaporator 33 and a fan 31. The compressor 32 is used to provide power for the refrigeration cycle of the refrigerator 10, and the fan 31 is used to allow air to enter the evaporator 33 of the refrigerator 10 for heat exchange and send the heat-released air into the storage chamber 102.

[0080] The fan feedback circuit 104 is configured to detect the operating state of the fan 31. For example, the operating state may be the actual rotation speed of the fan 31. Specifically, the fan feedback circuit 104 may send a corresponding signal to the main controller to indicate the operating state.

[0081] The main control board 105 includes a signal processing circuit 51 and a main controller 52 , wherein the signal processing circuit 51 is connected to the fan feedback circuit 104 , and the main controller 52 is connected to the signal processing circuit 51 and the fan 31 , respectively.

[0082] The main controller 52 is configured to send a control signal to the signal processing circuit 51, and the signal processing circuit 51 is configured to determine the first resistor of the fan feedback circuit 104 and the second resistor connected to the signal processing circuit 51 based on the received control signal, so that the fan feedback circuit 104 can feedback the operating status of the fan 31 to the main controller 52 through the signal processing circuit 51.

[0083] For example, Figure 1 For example, the fan feedback circuit 104, the first resistor corresponds to Figure 1 R2 in the second resistor corresponds to Figure 1 In R3 , the main controller 52 can automatically match the first resistor and the second resistor of the appropriate fan 31 by controlling the signal processing circuit 51 .

[0084] Exemplarily, the main controller 52 may be a microcontroller unit (MCU).

[0085] In this embodiment, the refrigerator includes a box body 101 provided with a storage chamber 102, a refrigeration system 103 arranged in the box body, a fan feedback circuit 104 and a main control board 105, wherein the main control board 105 includes a signal processing circuit 51 and a main controller 52, the main controller 52 is configured to send a control signal to the signal processing circuit 51, and the signal processing circuit 51 is configured to determine the first resistance of the fan feedback circuit 104 and the second resistance connected to the signal processing circuit 51 according to the received control signal, so as to automatically match the resistance suitable for the current fan 31, so that the fan feedback circuit 104 can feedback the operating status of the fan 31 to the main controller 52 through the signal processing circuit 51, and there is no need to manually perform resistance matching during development, thereby improving development efficiency.

[0086] Next, how the main controller 52 matches the first resistor of the fan feedback circuit 104 is described.

[0087] Figure 3 A schematic diagram of the structure of a fan feedback circuit 104 and a main control board 105 provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the signal processing circuit 51 includes a first analog switch and a first multiplexer.

[0088] The first analog switch is connected to the fan feedback circuit 104 via a first connecting line, and the first multiplexer is connected to the first connecting line.

[0089] For example, Figure 4 A schematic diagram of a first multiplexer according to an example of the present application is shown in FIG. Figure 4 As shown, the first multiplexer includes multiple first candidate resistors and switches corresponding to each first candidate resistor. For any switch, the switch is used to control whether the corresponding first candidate resistor is connected to the signal processing circuit 51, wherein the resistance values ​​of the multiple first candidate resistors are different.

[0090] Exemplarily, multiple first alternative resistors can be, for example, resistors R8, R9, ..., R15, and the resistance values ​​of resistors R8, R9, ..., R15 can be 100R (ohm), 220R, 330R, 470R, 680K (kiloohm), 1K, 2K, etc., respectively. This application does not impose any restrictions on this.

[0091] The control signal sent by the main controller 52 may include a first signal, a second signal and a third signal. Specifically, the main controller 52 is configured as follows:

[0092] When the main control board 105 is initially powered on, a first signal is sent to the first analog switch, and the first signal is used to control the first analog switch to be disconnected, so as to disconnect the fan feedback circuit 104 and the signal processing circuit 51. In other words, by controlling the first analog switch to be disconnected, the fan feedback circuit 104 can feed back the operating status of the fan 31 to the main controller 52 through the first multiplexer.

[0093] A second signal is sent to the fan 31 , where the second signal is used to instruct to start the fan 31 .

[0094] A third signal is sent to the first multiplexer, the third signal being used to instruct to sequentially connect the plurality of first candidate resistors to the circuit processing circuit 51, and when the currently connected first candidate resistor is connected, a first feedback signal is sent to the main controller 52. It can be understood that the first feedback signal is sent by the fan feedback circuit 104 to the first multiplexer when the currently connected first candidate resistor is connected because the first analog switch is disconnected.

[0095] A first resistor is determined according to the first feedback signal.

[0096] It can be understood that in order for the fan feedback circuit 104 to send the first feedback signal, when the main controller 52 sends the second signal to control the fan 31 to turn on, the circuit of the fan feedback circuit 104 also needs to be in the on state, that is, when the fan 31 is turned on, the fan feedback circuit 104 is also in the on state, so as to realize the monitoring of the operating status of the fan 31.

[0097] In a possible implementation, the main controller 52 can determine the first resistor according to the signal voltage value of the first feedback signal. For example, if the difference between the signal voltage value and the target voltage is less than a preset threshold, it means that the signal voltage value is relatively close to the target voltage, and the resistance value of the first candidate resistor corresponding to the first feedback signal can be determined as the resistance value of the first resistor. The main controller 52 can then close the first multiplexer.

[0098] In this embodiment, the main controller 52 determines the resistance value of the first resistor of the fan feedback circuit 104 by controlling an analog switch and a multiplexer.

[0099] Next, how the main controller 52 matches the second resistor of the signal processing circuit 51 is described.

[0100] Figure 5 A schematic diagram of the structure of a fan feedback circuit 104 and a main control board 105 provided in an embodiment of the present application is shown in FIG. Figure 5As shown, the signal processing circuit 51 also includes a second analog switch and a second multiplexer. The second analog switch is connected to the first analog switch via a second connecting line, and the second multiplexer is connected to the second connecting line. The second multiplexer includes multiple second alternative resistors and a switch corresponding to each second alternative resistor. For any switch, the switch is used to control whether the corresponding second alternative resistor is connected to the signal processing circuit 51, wherein the resistance values ​​of the multiple second alternative resistors are different.

[0101] For example, the specific structure of the second multiplexer can refer to Figure 4 , multiple second alternative resistors can be, for example, resistors R16, R17, ..., R23, and the resistance values ​​of resistors R16, R17, ..., R23 can be 1K, 3.3k, 4.7k, 10K, 22K, 33K, 47K, 100K, etc., respectively, and this application does not impose any limitation on this.

[0102] The control signal sent by the main controller 52 may also include a fourth signal, a fifth signal and a sixth signal. Specifically, the main controller 52 is configured as follows:

[0103] A fourth signal is sent to the first analog switch, and the fourth signal is used to control the first analog switch to be turned on, so that the fan feedback circuit 104 and the signal processing circuit 51 are turned on.

[0104] A fifth signal is sent to the second analog switch, and the fifth signal is used to control the second analog switch to be disconnected, so as to disconnect the fan feedback circuit 104 and the signal processing circuit 51. That is, by controlling the second analog switch to be disconnected, the fan feedback circuit 104 can feed back the operating status of the fan 31 to the main controller 52 through the second multiplexer.

[0105] A sixth signal is sent to the second multiplexer, the sixth signal being used to instruct to sequentially connect the plurality of second candidate resistors to the signal processing circuit 51, and a second feedback signal is sent to the main controller when the currently connected second candidate resistor is connected. It can be understood that the second feedback signal is sent by the fan feedback circuit 104 to the second multiplexer when the currently connected second candidate resistor is connected and the second analog switch is disconnected.

[0106] The second resistance is determined according to the second feedback signal.

[0107] It can be understood that in order for the fan feedback circuit 104 to send the second feedback signal, the fan 31 is in the on state and the fan feedback circuit 104 is also in the on state to monitor the operating state of the fan 31 .

[0108] In this embodiment, after determining the first resistor of the fan feedback circuit 104, the main controller 52 determines the resistance value of the second resistor required by the signal processing circuit 51 by controlling an analog switch and a multiplexer. At this time, the second resistor can be combined with the first resistor to effectively open the first switch in the signal processing circuit 51, so that the fan feedback circuit 104 can feedback the operating status of the fan 31 to the main controller 52 through the signal processing circuit 51.

[0109] In a possible implementation, the main controller 52 may determine whether the currently connected second candidate resistor is the second resistor according to the signal voltage value of the second feedback signal, specifically:

[0110] The main controller 52 may determine the signal voltage value of the second feedback signal, and then determine whether the currently connected second candidate resistor is the second resistor according to the signal voltage value and the target voltage.

[0111] In a possible implementation, the main controller 52 may determine whether the currently connected second candidate resistor is the second resistor according to the following method:

[0112] The main controller 52 can determine the first difference between the signal voltage value and the target voltage, and then determine whether the first difference is less than a preset threshold value. If so, it is determined that the currently connected second alternative resistor is the second resistor. If not, the main controller 52 can control the second multiplexer to continue to connect the next second alternative resistor.

[0113] Exemplarily, the preset threshold may be a smaller value, such as 1V or 0.5V. When the first difference is less than the preset threshold, it indicates that the signal voltage value of the second feedback signal is close to the target voltage, and the resistor may be determined to be the second resistor.

[0114] In a possible implementation, the target voltage may be a voltage value corresponding to a preset ratio of the input voltage of the main control board 105 . For example, the preset ratio may be 50%.

[0115] After the main controller 52 determines the second resistor, it can control the signal processing circuit 51 in the following manner to connect the second resistor to the signal processing circuit 51:

[0116] The main controller 52 sends a seventh signal to the first analog switch and the second analog switch, and the seventh signal is used to control the first analog switch and the second analog switch to be turned on, so that the fan feedback circuit 104 is connected to the signal processing circuit 51. That is, when the first analog switch and the second analog switch are turned on, the fan feedback circuit 104 can feedback the operating status of the fan 31 to the main controller 52 through the signal processing circuit 51.

[0117] The main controller 52 sends an eighth signal to the second multiplexer, and the eighth signal is used to control the second multiplexer to be turned on, and to turn on the path where the currently connected second candidate resistor is located, so that the currently connected second candidate resistor is connected to the signal processing circuit 51. In other words, when the main controller 52 determines that the currently connected second candidate resistor can be used as the second resistor, it can control the second multiplexer to be turned on, and turn on the path where the currently connected second candidate resistor is located, so that the resistor is used as the second resistor of the signal processing circuit 51.

[0118] Next, the specific circuit structure of the signal processing circuit 51 will be described.

[0119] Figure 6 A circuit structure diagram of a signal processing circuit 51 provided in an embodiment of the present application is shown in FIG. Figure 6 As shown, the signal processing circuit 51 further includes a third resistor, a fourth resistor, a first switch, a fifth resistor, a sixth resistor and a first capacitor.

[0120] The first end of the first capacitor is connected to the second connecting line.

[0121] The first end of the third resistor is connected to the second analog switch, the second end of the third resistor is connected to the first switch through the third connecting line, the first end of the fourth resistor is connected to the third connecting line, the second end of the fourth resistor is connected to the first switch through the fourth connecting line, and the second end of the first capacitor is connected to the fourth connecting line.

[0122] The fifth resistor is connected to the first switch via a fifth connection line, a first end of the sixth resistor is connected to the fifth connection line, and a second end of the sixth resistor is connected to the main controller 52 .

[0123] exist Figure 6 In the embodiment, R4 is a third resistor, R5 is a fourth resistor, R6 is a fifth resistor, R7 is a sixth resistor, Q2 is a first switch, and illustratively, the first switch may be a transistor. Figure 5 The first switch in the example is a triode. 1 represents the first end, and 2 represents the second end. For example, 1 of the third resistor represents the first end, and 2 of the third resistor represents the second end.

[0124] Next, the specific circuit structure of the fan feedback circuit 104 is described.

[0125] Figure 7 A structural diagram of a fan feedback circuit 104 provided in an embodiment of the present application is shown in FIG. Figure 7 As shown, the fan feedback circuit 104 includes a seventh resistor, an eighth resistor, a second switch and a second capacitor;

[0126] The second switch is connected to the fan 31, the second switch is connected to the seventh resistor through the sixth connecting line, the first end of the eighth resistor is connected to the sixth connecting line, the second end of the eighth resistor is connected to the first analog switch through the seventh connecting line, the first end of the second capacitor is connected to the seventh connecting line, and the second end of the second capacitor is respectively connected to the second switch and the first capacitor.

[0127] Exemplarily, the second switch may be a transistor. Figure 7 The second switch in the example is a triode. Figure 7 In the figure, R1 is the seventh resistor, R2 is the eighth resistor, Q1 is the second switch, C1 is the second capacitor, and GND represents grounding.

[0128] In order to better understand the circuit connection between the fan feedback circuit 104 and the main control board 105, please refer to Figure 8 , Figure 8 A schematic diagram of the circuit structure of a fan feedback circuit 104 and a main control board 105 provided in an embodiment of the present application.

[0129] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0130] For ease of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are intended to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

[0131] In this application, "multiple" means two or more. The first, second, etc. descriptions that appear in the embodiments of this application are only used for illustration and distinction of the described objects. There is no order, nor does it represent a special limitation on the number of devices in the embodiments of this application, and cannot constitute any limitation on the embodiments of this application. For example, the first threshold and the second threshold are only used to distinguish different thresholds, and do not represent the difference in size, priority, or importance of the two thresholds.

[0132] In this application, "exemplary", "in some embodiments", "in other embodiments", etc. are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" in this application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present concepts in a concrete way.

[0133] In this application, "of", "corresponding, relevant", "corresponding", and "associated" can sometimes be used interchangeably. It should be noted that when the distinction is not emphasized, the meanings they express are consistent. In the embodiments of this application, communication and transmission can sometimes be used interchangeably. It should be noted that when the distinction is not emphasized, the meanings they express are consistent. For example, transmission can include sending and / or receiving, which can be a noun or a verb.

[0134] In this application, "equal to" can be used in conjunction with "less than" or "greater than", but not with both "less than" and "greater than". When "equal to" is used in conjunction with "less than", it is applicable to the technical solution adopted by "less than". When "equal to" is used in conjunction with "greater than", it is applicable to the technical solution adopted by "greater than".

Claims

1. A refrigerator, characterized in that: The refrigerator comprises: A box body, wherein a storage room is arranged in the box body; The refrigeration system disposed in the box includes a compressor, an evaporator and a fan, wherein the compressor is used to provide power for the refrigeration cycle of the refrigerator, and the fan is used to allow air to enter the evaporator of the refrigerator for heat exchange and send the heat-released air into the storage room; a fan feedback circuit connected to the fan and configured to detect an operating state of the fan; A main control board, the main control board comprising: a signal processing circuit connected to the fan feedback circuit, configured to determine a first resistor of the fan feedback circuit and a second resistor connected to the signal processing circuit according to a received control signal, so that the fan feedback circuit feeds back the operating status to the main controller through the signal processing circuit; A main controller connected to the signal processing circuit and the fan respectively is configured to send the control signal to the signal processing circuit.

2. The refrigerator according to claim 1, characterized in that: The signal processing circuit includes a first analog switch and a first multiplexer; the first analog switch is connected to the fan feedback circuit via a first connecting line, the first multiplexer is connected to the first connecting line, the first multiplexer includes a plurality of first candidate resistors and a switch corresponding to each first candidate resistor, for any switch, the switch is used to control whether the corresponding first candidate resistor is connected to the signal processing circuit, wherein the resistance values ​​of the plurality of first candidate resistors are different; The control signal includes a first signal, a second signal and a third signal; The main controller is configured as follows: When the main control board is initially powered on, the first signal is sent to the first analog switch, wherein the first signal is used to control the first analog switch to be disconnected, so as to disconnect the fan feedback circuit and the signal processing circuit; Sending the second signal to the fan, wherein the second signal is used to instruct to start the fan; Sending the third signal to the first multiplexer, wherein the third signal is used to instruct the plurality of first candidate resistors to be connected to the signal processing circuit in sequence, and sending a first feedback signal to the main controller when the currently connected first candidate resistor is connected; The first resistance is determined according to the first feedback signal.

3. The refrigerator according to claim 2, characterized in that: The signal processing circuit further includes a second analog switch and a second multiplexer; the second analog switch is connected to the first analog switch via a second connecting line, the second multiplexer is connected to the second connecting line, the second multiplexer includes a plurality of second candidate resistors and a switch corresponding to each second candidate resistor, for any switch, the switch is used to control whether the corresponding second candidate resistor is connected to the signal processing circuit, wherein the resistance values ​​of the plurality of second candidate resistors are different; The control signal also includes a fourth signal, a fifth signal and a sixth signal; The main controller is configured as follows: Sending the fourth signal to the first analog switch, wherein the fourth signal is used to control the first analog switch to be turned on, so that the fan feedback circuit and the signal processing circuit are turned on; sending the fifth signal to the second analog switch, wherein the fifth signal is used to control the second analog switch to be disconnected, so as to disconnect the fan feedback circuit and the signal processing circuit; sending the sixth signal to the second multiplexer, the sixth signal being used to instruct the plurality of second candidate resistors to be connected to the signal processing circuit in sequence, and sending a second feedback signal to the main controller when the currently connected second candidate resistor is connected; The second resistance is determined according to the second feedback signal.

4. The refrigerator according to claim 3, characterized in that: The main controller is configured as follows: determining a signal voltage value of the second feedback signal; It is determined whether the currently connected second candidate resistor is the second resistor according to the signal voltage value and the target voltage.

5. The refrigerator according to claim 4, characterized in that: The main controller is configured as follows: Determine a first difference between the signal voltage value and the target voltage; Determining whether the first difference is less than a preset threshold; If so, it is determined that the currently connected second candidate resistor is the second resistor.

6. The refrigerator according to claim 5, characterized in that: The target voltage is a voltage value corresponding to a preset ratio of the input voltage of the main control board.

7. The refrigerator according to any one of claims 3 to 6, characterized in that: If the currently connected second candidate resistor is the second resistor, the main controller is configured as follows: Sending a seventh signal to the first analog switch and the second analog switch, wherein the seventh signal is used to control the first analog switch and the second analog switch to be turned on, so that the fan feedback circuit is connected to the signal processing circuit; An eighth signal is sent to the second multiplexer, where the eighth signal is used to control the second multiplexer to be turned on, and to turn on the path where the currently connected second candidate resistor is located, so that the currently connected second candidate resistor is connected to the signal processing circuit.

8. The refrigerator according to any one of claims 1 to 7, characterized in that: The signal processing circuit further includes a third resistor, a fourth resistor, a first switch, a fifth resistor, a sixth resistor and a first capacitor; The first end of the first capacitor is connected to the second connecting line; The first end of the third resistor is connected to the second analog switch, the second end of the third resistor is connected to the first switch through a third connection line, the first end of the fourth resistor is connected to the third connection line, the second end of the fourth resistor is connected to the first switch through a fourth connection line, and the second end of the first capacitor is connected to the fourth connection line; The fifth resistor is connected to the first switch via a fifth connecting line, a first end of the sixth resistor is connected to the fifth connecting line, and a second end of the sixth resistor is connected to the main controller.

9. The refrigerator according to any one of claims 1 to 7, characterized in that: The fan feedback circuit includes a seventh resistor, an eighth resistor, a second switch and a second capacitor; The second switch is connected to the fan, the second switch is connected to the seventh resistor through the sixth connecting line, the first end of the eighth resistor is connected to the sixth connecting line, the second end of the eighth resistor is connected to the first analog switch through the seventh connecting line, the first end of the second capacitor is connected to the seventh connecting line, and the second end of the second capacitor is respectively connected to the second switch and the first capacitor.

10. A refrigerator, characterized in that: The refrigerator comprises: A box body, wherein a storage room is arranged in the box body; The refrigeration system disposed in the box includes a compressor, an evaporator and a fan, wherein the compressor is used to provide power for the refrigeration cycle of the refrigerator, and the fan is used to allow air to enter the evaporator of the refrigerator for heat exchange and send the heat-released air into the storage room; a fan feedback circuit connected to the fan and configured to detect an operating state of the fan; A main control board connected to the fan, the main control board comprising: a signal processing circuit connected to the fan feedback circuit; The main controller connected to the signal processing circuit is configured to: control multiple alternative resistors to be connected to the signal processing circuit in sequence to determine the resistor matching the fan, so that the fan feedback circuit can feedback the operating status to the main controller through the signal processing circuit.

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