Refrigerator and control method thereof

Abstract

The embodiment of the invention belongs to the technical field of household appliances, and provides a refrigerator and a control method of the refrigerator, a main controller of the refrigerator is configured to send a PWM signal to a control chip, the control chip of a fan is configured to output a pulse signal to a fan coil according to the PWM signal, the pulse signal is used for driving the fan coil to rotate, and the fan coil is driven to rotate. Acquiring current and / or input voltage of the fan coil, if the current exceeds rated current and / or the input voltage exceeds the rated voltage, disconnecting the fan coil and the control chip, and determining whether to connect the fan coil and the control chip or not according to the current current and / or the current input voltage of the fan coil after disconnecting for a preset duration, when the current or the voltage of the fan is abnormal, the circuit of the fan can be automatically cut off to realize protection, and the circuit of the fan can be recovered to be conducted when the current or the voltage is recovered to be normal, so that the refrigerator cannot influence refrigeration due to the fact that the fan does not work.

Description

Technical Field

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

[0002] As the functions of refrigerator products become more complex and diversified, the control systems of refrigerators will also become more complex. Therefore, the application of air-cooled products will become popular in the future, and the utilization rate of fans will increase significantly.

[0003] At present, a fuse is usually provided in the driving circuit of the fan of the refrigerator. Most of the fuses are fast-blow fuses. When the driving voltage is abnormal, the fuse of the fan will melt in a short time to protect the internal circuit of the fan.

[0004] However, after the fuse blows, if the fuse has not been repaired, the fan will not work directly, affecting the normal operation of the entire machine and failing to perform normal cooling. Summary of the invention

[0005] The embodiment of the present application provides a refrigerator and a control method for the refrigerator, which can be used to solve the problem in the related art that when the driving voltage of the refrigerator fan is abnormal, the fan will not work due to the fuse blowing, thereby affecting the normal operation of the whole machine and failing to perform normal cooling.

[0006] In a first aspect, an embodiment of the present application provides a refrigerator, comprising:

[0007] A box body, wherein a storage room is arranged in the box body;

[0008] The refrigeration system disposed in the box includes a compressor, an evaporator and a fan, wherein the compressor is configured to provide power for the refrigeration cycle of the refrigerator, and the fan is configured to allow air to enter the evaporator of the refrigerator for heat exchange and send the heat-released air into the storage room; the fan includes a control chip;

[0009] A main controller connected to the control chip, used for sending a pulse width modulation (PWM) signal to the control chip;

[0010] Wherein, the fan further includes a fan coil, the control chip is connected to the fan coil, and the control chip is configured as follows:

[0011] Outputting a pulse signal to the fan coil according to the PWM signal, wherein the pulse signal is used to drive the fan coil to rotate;

[0012] Acquiring the current and / or input voltage of the fan coil, and if the current exceeds the rated current and / or the input voltage exceeds the rated voltage, disconnecting the fan coil from the control chip;

[0013] After the fan coil is disconnected from the control chip for a preset time, it is determined whether to connect the fan coil to the control chip according to the current current and / or the current input voltage of the fan coil.

[0014] In this embodiment, the refrigerator includes a box body with a storage chamber, a refrigeration system arranged in the box body, and a main controller connected to a control chip of a fan in the refrigeration system. The main controller is configured to send a PWM signal to the control chip. The fan includes a fan coil. The control chip is connected to the fan coil. The control chip is configured to output a pulse signal to the fan coil according to the PWM signal. The pulse signal is used to drive the fan coil to rotate and obtain the current and / or input voltage of the fan coil. If the current exceeds the rated current and / or the input voltage exceeds the rated voltage, the connection between the fan coil and the control chip is disconnected. After the connection between the fan coil and the control chip is disconnected for a preset time, it is determined whether to reconnect the connection between the fan coil and the control chip according to the current current and / or the current input voltage of the fan coil. When the current or voltage of the fan is abnormal, the present application can automatically cut off the fan circuit to achieve protection, and when the current or voltage returns to normal, the fan circuit can be restored to conduction, so that the refrigerator will not be affected by the non-operation of the fan. Refrigeration.

[0015] In some embodiments of the present application, the control chip is configured as follows:

[0016] Determining a target rotation speed of the fan coil according to the PWM signal;

[0017] The pulse signal is generated according to the target rotational speed, and the pulse signal is used to drive the fan coil to rotate according to the target rotational speed.

[0018] In this embodiment, the control chip can determine the rotation speed of the fan coil according to the PWM signal to generate a pulse signal for driving the coil to rotate according to the target rotation speed, so as to drive the fan coil to rotate.

[0019] In some embodiments of the present application, the wind turbine further includes a power supply circuit, the power supply circuit is connected to the control chip, and the power supply circuit is configured to supply power to the control chip;

[0020] The power supply circuit comprises: a first diode;

[0021] The anode of the first diode is connected to the power supply, and the cathode of the first diode is connected to the power supply pin of the control chip.

[0022] In this embodiment, the control chip can be powered by the power supply circuit, and by adding a diode at the output end of the power supply, damage to the internal components of the fan due to reverse connection of the positive and negative poles of the power line can be prevented.

[0023] In some embodiments of the present application, the power supply circuit further includes: a first voltage stabilizing diode;

[0024] The positive electrode of the first voltage stabilizing diode is grounded, and the negative electrode of the first voltage stabilizing diode is connected to the negative electrode of the first diode.

[0025] In this embodiment, a voltage stabilizing diode is added to the power supply circuit to stabilize the voltage of the power supply and prevent surge breakdown.

[0026] In some embodiments of the present application, the power supply circuit further includes: a first capacitor;

[0027] A first end of the first capacitor is grounded, and a second end of the first capacitor is connected to a negative electrode of the first voltage stabilizing diode.

[0028] In this embodiment, by adding a capacitor in the power supply circuit, a filtering effect is played on the high-frequency burrs of the power input, thereby reducing the impact of the power ripple on the back-end circuit.

[0029] In some embodiments of the present application, the fan further includes a speed feedback circuit; the speed feedback circuit is respectively connected to the power supply circuit, the control chip and the main controller;

[0030] The power supply circuit is configured to supply power to the speed feedback circuit;

[0031] The control chip is configured to obtain the actual rotation speed of the fan coil and input a feedback signal to the rotation speed feedback circuit;

[0032] The speed feedback circuit is configured to send a speed signal to the main controller according to the feedback signal, wherein the speed signal is used to indicate an actual speed of the fan coil.

[0033] In this embodiment, a fan speed feedback circuit is added to facilitate the main controller to collect the actual speed of the fan coil, so as to control the PWM signal used to indicate the target speed according to the actual speed, so that the actual speed of the fan coil reaches the target speed.

[0034] In some embodiments of the present application, the speed feedback circuit includes a transistor, a first resistor, a second resistor, a third resistor, a second voltage stabilizing diode, and a second capacitor;

[0035] The base of the transistor is connected to the control chip through a first connecting line, the first end of the first resistor is connected to the output end of the power supply circuit, and the second end of the first resistor is connected to the first connecting line;

[0036] The collector of the transistor is connected to the first end of the second resistor through a second connecting line, the second end of the second resistor is connected to the output end of the power supply circuit, and the first end of the third resistor is connected to the second connecting line;

[0037] The emitter base of the transistor is grounded through a third connecting line, the anode of the second voltage stabilizing diode is connected to the third connecting line, and the cathode of the second voltage stabilizing diode is connected to the first end of the second resistor;

[0038] The second end of the third resistor is connected to the main controller via a fourth connecting line;

[0039] A first end of the second capacitor is connected to the fourth connecting line, and a second end of the second capacitor is connected to the anode of the second zener diode.

[0040] In this embodiment, the speed signal is sent to the main controller according to the feedback signal through the specific circuit structure of the speed feedback circuit.

[0041] In some embodiments of the present application, the main controller is configured as follows:

[0042] If the actual speed is less than the target speed, the frequency of the subsequent PWM signal is adjusted so that the actual speed of the fan coil reaches the target speed.

[0043] In this embodiment, if the actual rotation speed is less than the target rotation speed, the main controller may adjust the subsequently input PWM signal so that the actual rotation speed of the fan coil reaches the target rotation speed.

[0044] In a second aspect, the present application provides a method for controlling a refrigerator, the refrigerator comprising:

[0045] A box body, wherein a storage room is arranged in the box body;

[0046] The refrigeration system disposed in the box includes a compressor, an evaporator and a fan, wherein the compressor is configured to provide power for the refrigeration cycle of the refrigerator, and the fan is configured to allow air to enter the evaporator of the refrigerator for heat exchange and send the heat-released air into the storage room; the fan includes a control chip;

[0047] A main controller connected to the control chip, configured to send a pulse width modulation (PWM) signal to the control chip;

[0048] Wherein, the fan further comprises a fan coil, and the control chip is connected to the fan coil;

[0049] The method comprises:

[0050] Outputting a pulse signal to the fan coil according to the PWM signal, wherein the pulse signal is used to drive the fan coil to rotate;

[0051] Acquiring the current and / or input voltage of the fan coil, and if the current exceeds the rated current and / or the input voltage exceeds the rated voltage, disconnecting the fan coil from the control chip;

[0052] After the fan coil is disconnected from the control chip for a preset time, it is determined whether to connect the fan coil to the control chip according to the current current and / or the current input voltage of the fan coil.

[0053] In this embodiment, a pulse signal is output to the fan coil according to the PWM signal, and the pulse signal is used to drive the fan coil to rotate, and obtain the current and / or input voltage of the fan coil. If the current exceeds the rated current, and / or the input voltage exceeds the rated voltage, the connection between the fan coil and the control chip is disconnected. After the connection between the fan coil and the control chip is disconnected for a preset period of time, it is determined whether to reconnect the connection between the fan coil and the control chip according to the current current and / or the current input voltage of the fan coil. When the current or voltage of the fan is abnormal, the present application can automatically cut off the fan circuit to achieve protection, and the fan circuit can be restored when the current or voltage returns to normal, so that the refrigerator will not be affected by the non-operating fan.

[0054] In a third aspect, the present application provides a refrigerator, comprising:

[0055] A box body, wherein a storage room is arranged in the box body;

[0056] A refrigeration system disposed in the box includes a compressor, an evaporator and a fan, wherein the compressor is configured to provide power for a refrigeration cycle of the refrigerator, and the fan is configured to allow air to enter the evaporator of the refrigerator for heat exchange and send the heat-released air into the storage room;

[0057] A main controller connected to the fan, configured to send a PWM signal to the fan;

[0058] The fan comprises a fan coil, and the fan is further configured as:

[0059] Outputting a pulse signal to the fan coil according to the PWM signal, wherein the pulse signal is used to drive the fan coil to rotate;

[0060] Obtaining the current and / or input voltage of the fan coil;

[0061] If the current exceeds the rated current, and / or the input voltage exceeds the rated voltage, disconnecting the fan coil from the control chip;

[0062] After disconnecting the fan coil from the control chip for a preset time period, connecting the fan coil from the control chip.

[0063] In this embodiment, the refrigerator includes a box body with a storage room, a refrigeration system arranged in the box body, and a main controller connected to the fan in the refrigeration system. The main controller is configured to send a PWM signal to the fan. The fan includes a fan coil. The fan is configured to output a pulse signal to the fan coil according to the PWM signal. The pulse signal is used to drive the fan coil to rotate and obtain the current and / or input voltage of the fan coil. If the current exceeds the rated current and / or the input voltage exceeds the rated voltage, the connection between the fan coil and the control chip is disconnected, and after cutting off the circuit of the fan coil for a preset time, the circuit of the fan coil is connected. When the current or voltage of the fan is abnormal, the present application can automatically cut off the circuit of the fan to achieve protection, and when the current or voltage returns to normal, the circuit of the fan can be restored to conduction, so that it can work normally, so that the refrigerator will not be affected by the refrigeration due to the non-operation of the fan.

[0064] In a fourth aspect, the present application provides a computer-readable storage medium having computer-executable instructions stored thereon. When the computer-executable instructions are executed by a processor, the method described in the second aspect is implemented.

[0065] The computer-readable storage medium provided in the embodiment of the present application can execute the technical solution in the above method embodiment, and its beneficial effects are similar, which will not be repeated here.

[0066] In a fifth aspect, the present application provides a computer program product, including a computer program, which implements the method described in the second aspect when executed by a processor.

[0067] The computer program product provided in the embodiment of the present application can execute the technical solution in the above method embodiment, and its beneficial effects are similar, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] 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.

[0069] Figure 1 A schematic diagram of the structure of a conventional fan drive circuit used as an example in this application;

[0070] Figure 2 A schematic diagram of the structure of a refrigerator provided in an embodiment of the present application;

[0071] Figure 3 A schematic diagram of the structure of a fan 21 provided in an embodiment of the present application;

[0072] Figure 4 A schematic diagram of the structure of a fan 21 provided in an embodiment of the present application;

[0073] Figure 5 A schematic diagram of the structure of a fan 21 provided in an embodiment of the present application;

[0074] Figure 6 A schematic diagram of the structure of a fan 21 provided in an embodiment of the present application;

[0075] Figure 7 A schematic diagram of the structure of a fan 21 provided in an embodiment of the present application;

[0076] Figure 8 A schematic diagram of the structure of a speed feedback circuit 213 provided in an embodiment of the present application;

[0077] Fig. 9 A complete structural schematic diagram of a fan 21 provided in an embodiment of the present application;

[0078] Fig.10 A flowchart of a refrigerator control method provided in this application. DETAILED DESCRIPTION

[0079] 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.

[0080] 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.

[0081] In addition, the terms "including" and "having" 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.

[0082] At present, a fuse is usually provided in the driving circuit of the fan of the refrigerator to protect the fan through the fuse. Figure 1 The schematic diagram of the structure of the conventional fan driving circuit of the present application is as follows: Figure 1 It can be seen that when the driving voltage is abnormal, the fuse of the fan will blow out in a short time to protect the internal circuit of the fan, and the defective rate of the fuse is relatively high.

[0083] After the fuse blows, if the fuse has not been repaired, the fan will not work directly, affecting the normal operation of the whole machine and failing to perform normal cooling.

[0084] Therefore, the present application provides a refrigerator, which sends a PWM signal to the control chip of the fan through the main controller of the refrigerator to drive the fan coil to rotate, and can determine whether to disconnect the fan from the control chip according to the current and / or input voltage of the fan coil to achieve protection of the fan, and after being disconnected for a preset period of time, it can continue to determine whether to reconnect the fan coil from the control chip according to the current current and / or input voltage of the fan coil, and the fan can resume normal operation when the current or voltage returns to normal, so that the refrigerator will not be affected by the refrigeration due to the non-operating fan.

[0085] 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.

[0086] Figure 2 A structural schematic diagram of a refrigerator provided in an embodiment of the present application, the refrigerator includes a cabinet 101, a storage chamber 102 arranged in the cabinet 101, a refrigeration system 103 arranged in the cabinet 101, and a main controller 104 connected to a fan 21 in the refrigeration system 103.

[0087] Among them, the refrigeration system 103 includes a compressor 22, an evaporator 23 and a fan 21. The compressor 22 is used to provide power for the refrigeration cycle of the refrigerator 10. The fan 21 is used to allow air to enter the evaporator 23 of the refrigerator 10 for heat exchange and send the heat-released air into the storage chamber 102. The fan 21 includes a control chip 210 and a fan coil 211.

[0088] The main controller 104 is configured to send a pulse width modulation (PWM) signal to the control chip 210 .

[0089] The fan 21 is configured as follows:

[0090] According to the PWM signal, a pulse signal is output to the fan coil 211, and the pulse signal is used to drive the fan coil 211 to rotate. The current and / or input voltage of the fan coil 211 are obtained. If the current exceeds the rated current, and / or the input voltage exceeds the rated voltage, the circuit of the fan coil 211 is cut off. After the circuit of the fan coil 211 is cut off for a preset time, the circuit of the fan coil 211 is connected. Exemplarily, the preset time can be 3 minutes, or other time, and this application does not limit this.

[0091] Specifically, the main controller 104 is connected to the PWM interface of the control chip 210, the control chip 210 is connected to the fan coil 211, and the control chip 210 is configured as follows:

[0092] According to the PWM signal, a pulse signal is output to the fan coil 211 , and the pulse signal is used to drive the fan coil 211 to rotate.

[0093] The current and / or input voltage of the fan coil 211 are obtained. If the current exceeds the rated current and / or the input voltage exceeds the rated voltage, the connection between the fan coil 211 and the control chip 210 is disconnected.

[0094] After the fan coil 211 is disconnected from the control chip 210 for a preset time, it is determined whether to reconnect the fan coil 211 from the control chip 210 according to the current current of the fan coil 211 and / or the current input voltage.

[0095] Specifically, Figure 3 As shown, the fan coil 211 is connected to the first output pin (i.e. Figure 2 OUT1 pin in the output) and the second output pin (i.e. Figure 2 The control chip 210 outputs a pulse signal to the fan coil 211 through the first output pin and the second output pin according to the PWM signal, and the pulse signal is used to drive the fan coil 211 to rotate.

[0096] The current and / or input voltage of the fan coil 211 are detected through the first output pin and the second output pin. If the current exceeds the rated current and / or the input voltage exceeds the rated voltage, the first output pin and the second output pin are disconnected, thereby disconnecting the fan coil 211 from the control chip 210.

[0097] After the first output pin and the second output pin are disconnected for a preset period of time, it is determined whether to connect the first output pin and the second output pin according to the current current and / or the current input voltage of the fan coil 211, that is, whether to connect the fan coil 211 with the control chip 210.

[0098] In this embodiment, the refrigerator 10 includes a box body 101 provided with a storage chamber 102, a refrigeration system 103 arranged in the box body 101, and a main controller 104 connected to a control chip 210 of a fan 21 in the refrigeration system 103. The main controller 104 is configured to send a PWM signal to the control chip 210. The fan 21 includes a fan coil 211. The control chip 210 is connected to the fan coil 211. The control chip 210 is configured to output a pulse signal to the fan coil 211 according to the PWM signal. The pulse signal is used to drive the fan coil 211 to rotate, and obtain the current and / or input voltage of the fan coil 211. If If the current exceeds the rated current, and / or the input voltage exceeds the rated voltage, the connection between the fan coil 211 and the control chip 210 is disconnected, and after the fan coil 211 and the control chip 210 are disconnected for a preset period of time, it is determined whether to reconnect the fan coil 211 and the control chip 210 according to the current current of the fan coil 211 and / or the current input voltage. When the current or voltage of the fan 21 is abnormal, the present application can automatically cut off the circuit of the fan 21 for protection, and can restore the circuit of the fan 21 when the current or voltage returns to normal, so that the refrigerator 10 will not be affected by the refrigeration due to the non-operation of the fan 21.

[0099] In a possible implementation, the control chip 210 may control the rotation speed of the fan coil 211, specifically:

[0100] The control chip 210 is configured as follows:

[0101] Determine the target speed of the fan coil 211 according to the PWM signal;

[0102] A pulse signal is generated according to the target rotation speed, and the pulse signal is used to drive the fan coil 211 to rotate according to the target rotation speed.

[0103] For example, the control chip 210 can determine the target speed according to the frequency of the PWM signal, which can be determined by formula (1):

[0104] r=f×30 (1)

[0105] Where r is the target speed and f is the frequency of the PWM signal.

[0106] After determining the target speed, the control chip 210 can generate a pulse signal for driving the fan coil 211 according to the target speed, so that magnetic poles are formed on the fan coil 211 to interact with the magnetic poles of the fan rotor to drive the fan rotor to rotate.

[0107] In a possible implementation, the fan 21 further includes a power supply circuit 212, and the power supply circuit 212 is connected to the control chip 210. Figure 3A schematic diagram of the structure of a fan 21 provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the power supply circuit 212 is connected to the VCC interface of the control chip 210, and the power supply circuit 212 is configured to supply power to the control chip 210. Specifically, the input end of the power supply circuit 212 is connected to the power supply, and the output end of the power supply circuit 212 is connected to the control chip 210 to process the input voltage of the control chip 210.

[0108] In a possible implementation, the power supply circuit 212 includes a first diode. Figure 4 A schematic diagram of the structure of a fan 21 provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, the anode of the first diode is connected to the power supply, and the cathode of the first diode is connected to the power supply pin of the control chip 210 (ie Figure 3 The VCC pin of the fan 21 is connected to the power supply circuit 212 to supply power to the control chip 210. By adding a first diode at the output end of the power supply, damage to the internal components of the fan 21 caused by reverse connection of the positive and negative poles of the power line can be prevented.

[0109] In a possible implementation, the power supply circuit 212 further includes a first voltage stabilizing diode. Figure 5 A schematic diagram of the structure of a fan 21 provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, the positive electrode of the first voltage stabilizing diode is grounded, and the negative electrode of the first voltage stabilizing diode is connected to the negative electrode of the first diode. By adding the first voltage stabilizing diode in the power supply circuit, the voltage output by the power supply is stabilized to prevent surge breakdown.

[0110] In a possible implementation, the power supply circuit 212 further includes: a first capacitor, Figure 6 A schematic diagram of the structure of a fan 21 provided in an embodiment of the present application is shown in FIG. Figure 6 As shown, the first end of the first capacitor is grounded, and the second end of the first capacitor is connected to the negative electrode of the first voltage-stabilizing diode. In this embodiment, by adding a capacitor to the power supply circuit 212, a filtering effect is played on the high-frequency burrs of the power supply input, and the impact of the power supply ripple on the back-end circuit is reduced, that is, the impact of the power supply ripple on the circuit in the back-end fan 21 is reduced.

[0111] As for the target speed of the fan coil 211 controlled by the control chip 210, it can be understood that the target speed is an ideal speed. If the impeller of the fan 21 is damaged, the bearing is worn, or the magnetic field is abnormal, the fan speed will be affected, so that the actual speed of the fan coil 211 may not reach the target speed.

[0112] In a possible implementation, the fan 21 further includes a speed feedback circuit 213. Figure 7A schematic diagram of the structure of a fan 21 provided in an embodiment of the present application is shown in FIG. Figure 7 As shown, the speed feedback circuit 213 is respectively connected to the power supply circuit 212, the control chip 210 and the main controller 104. Specifically, the input end of the speed feedback circuit 213 is connected to the FG interface of the control chip 210, and the output end of the speed feedback circuit 213 is connected to the main controller 104.

[0113] Specifically, the power supply circuit 212 is configured to supply power to the speed feedback circuit 213 .

[0114] The control chip 210 is configured to obtain the actual rotation speed of the fan coil 211 and input a feedback signal to the rotation speed feedback circuit 213 .

[0115] The speed feedback circuit 213 is configured to send a speed signal to the main controller 104 according to the feedback signal, and the speed signal is used to indicate the actual speed of the fan coil 211 .

[0116] In this embodiment, a speed feedback circuit 213 of the fan 21 is added to facilitate the main controller 104 to collect the actual speed of the fan coil 211, so as to control the PWM signal for indicating the target speed according to the actual speed, so that the actual speed of the fan reaches the target speed.

[0117] In one possible implementation, Figure 8 A schematic diagram of the structure of a speed feedback circuit 213 provided in an embodiment of the present application is shown in FIG. Figure 8 As shown:

[0118] The speed feedback circuit 213 includes a transistor, a first resistor, a second resistor, a third resistor, a second voltage regulator diode, and a second capacitor.

[0119] The base of the transistor is connected to the control chip 210 through a first connecting line, the first end of the first resistor is connected to the output end of the power supply circuit 212, and the second end of the first resistor is connected to the first connecting line.

[0120] The collector of the transistor is connected to the first end of the second resistor through the second connecting line, the second end of the second resistor is connected to the output end of the power supply circuit 212, and the first end of the third resistor is connected to the second connecting line.

[0121] The emitter base of the triode is grounded through the third connecting line, the anode of the second voltage stabilizing diode is connected to the third connecting line, and the cathode of the second voltage stabilizing diode is connected to the first end of the second resistor.

[0122] The second end of the third resistor is connected to the main controller 104 through a fourth connection line.

[0123] A first end of the second capacitor is connected to the fourth connecting line, and a second end of the second capacitor is connected to the anode of the second voltage stabilizing diode.

[0124] Specifically, the first resistor is a pull-up resistor, which pulls the signal line (i.e., the first connecting line) to a logic high level to ensure correct transmission and identification of the signal. The feedback signal is isolated and released through the transistor and the second resistor. The signal waveform is corrected through the second voltage-stabilizing diode at the back end to remove glitch signals. The current is limited through the third resistor to prevent overcurrent in the front-end signal processing circuit, thereby playing a protective role. The waveform of the feedback signal is filtered again through the second capacitor to output a complete rectangular waveform, which is convenient for the main controller 104 to collect the actual speed of the fan coil 211.

[0125] In one possible implementation, after the main controller 104 obtains the speed signal sent by the speed feedback circuit 213, it can determine the actual speed of the fan coil 211 based on the speed signal. If the actual speed is less than the target speed, the main controller 104 can adjust the frequency of the subsequent PWM signal. For example, the frequency of the subsequent PWM signal can be adjusted in steps of 2 Hz (Hertz) until the actual speed of the fan coil 211 reaches the target speed to obtain a better cooling effect.

[0126] Fig. 9 A complete structural schematic diagram of a fan 21 provided in an embodiment of the present application.

[0127] In the above embodiment, Figure 7 In the figure, 1 and 2 represent the first end and the second end respectively. For example, the two ends 1 and 2 of the first resistor represent the first end of the first resistor and the second end of the first resistor respectively, the two ends 1 and 2 of the second resistor represent the first end of the second resistor and the second end of the second resistor respectively, the two ends 1 and 2 of the third resistor represent the first end of the third resistor and the second end of the third resistor respectively, and so on.

[0128] In the above figures, GND represents ground, that is, the ground terminal of the wire (Ground), VCC represents voltage power supply (VoltCurrent Condenser), and FG is the speed signal feedback interface.

[0129] Fig.10 This is a flow chart of a refrigerator control method provided by the present application. The execution subject of the method may be the control chip 210 of the fan 21 in the above embodiment. Fig.10 As shown, the method comprises the following steps:

[0130] S1001. Output a pulse signal to the fan coil according to the PWM signal, where the pulse signal is used to drive the fan coil to rotate.

[0131] S1002, obtaining the current and / or input voltage of the fan coil, if the current exceeds the rated current, and / or the input voltage exceeds the rated voltage, disconnecting the fan coil from the control chip.

[0132] S1003. After the fan coil and the control chip are disconnected for a preset time, determine whether to connect the fan coil and the control chip according to the current current and / or the current input voltage of the fan coil.

[0133] For the specific implementation, please refer to the above embodiments, which will not be described in detail here.

[0134] In this embodiment, a pulse signal is output to the fan coil according to the PWM signal, and the pulse signal is used to drive the fan coil to rotate, and obtain the current and / or input voltage of the fan coil. If the current exceeds the rated current, and / or the input voltage exceeds the rated voltage, the connection between the fan coil and the control chip is disconnected. After the connection between the fan coil and the control chip is disconnected for a preset period of time, it is determined whether to reconnect the connection between the fan coil and the control chip according to the current current and / or the current input voltage of the fan coil. When the current or voltage of the fan is abnormal, the present application can automatically cut off the fan circuit to achieve protection, and the fan circuit can be restored when the current or voltage returns to normal, so that the refrigerator will not be affected by the non-operating fan.

[0135] The present application also provides a computer-readable storage medium, which may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes. Specifically, the computer-readable storage medium stores program instructions, and the program instructions are used for the methods in the above embodiments.

[0136] The present application also provides a program product, which includes execution instructions stored in a readable storage medium. When the computer program is executed by a computer, the technical solution shown in the above method embodiment is executed. The specific implementation method and technical effect are similar and will not be repeated here.

[0137] 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.

[0138] 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.

[0139] In this application, "multiple" means two or more. The first, second, etc. descriptions 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.

[0140] In this application, "exemplary", "in some embodiments", "in other embodiments", etc. are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of the word exemplary is intended to present concepts in a concrete way.

[0141] In this application, "of", "corresponding, relevant", "corresponding", and "associated" may 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 may sometimes be used interchangeably. It should be noted that when the distinction is not emphasized, the meanings they express are consistent. For example, transmission may include sending and / or receiving, which may be a noun or a verb.

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; the fan includes a control chip; A main controller connected to the control chip, configured to send a pulse width modulation (PWM) signal to the control chip; Wherein, the fan further includes a fan coil, the control chip is connected to the fan coil, and the control chip is configured as follows: Outputting a pulse signal to the fan coil according to the PWM signal, wherein the pulse signal is used to drive the fan coil to rotate; Acquiring the current and / or input voltage of the fan coil, and if the current exceeds the rated current and / or the input voltage exceeds the rated voltage, disconnecting the fan coil from the control chip; After the fan coil is disconnected from the control chip for a preset time, it is determined whether to connect the fan coil to the control chip according to the current current and / or the current input voltage of the fan coil.

2. The refrigerator according to claim 1, characterized in that: The control chip is configured as follows: Determining a target rotation speed of the fan coil according to the PWM signal; The pulse signal is generated according to the target rotational speed, and the pulse signal is used to drive the fan coil to rotate according to the target rotational speed.

3. The refrigerator according to claim 1 or 2, characterized in that: The wind turbine further includes a power supply circuit, the power supply circuit is connected to the control chip, and the power supply circuit is configured to supply power to the control chip; The power supply circuit comprises: a first diode; The anode of the first diode is connected to the power supply, and the cathode of the first diode is connected to the power supply pin of the control chip.

4. The refrigerator according to claim 3, characterized in that: The power supply circuit further includes: a first voltage stabilizing diode; The positive electrode of the first voltage stabilizing diode is grounded, and the negative electrode of the first voltage stabilizing diode is connected to the negative electrode of the first diode.

5. The refrigerator according to claim 4, characterized in that: The power supply circuit further includes: a first capacitor; A first end of the first capacitor is grounded, and a second end of the first capacitor is connected to a negative electrode of the first voltage stabilizing diode.

6. The refrigerator according to any one of claims 1 to 5, characterized in that: The fan further includes a speed feedback circuit; the speed feedback circuit is respectively connected to the power supply circuit, the control chip and the main controller; The power supply circuit is configured to supply power to the speed feedback circuit; The control chip is configured to obtain the actual rotation speed of the fan coil and input a feedback signal to the rotation speed feedback circuit; The speed feedback circuit is configured to send a speed signal to the main controller according to the feedback signal, wherein the speed signal is used to indicate an actual speed of the fan coil.

7. The refrigerator according to claim 6, characterized in that: The speed feedback circuit includes a transistor, a first resistor, a second resistor, a third resistor, a second voltage stabilizing diode, and a second capacitor; The base of the transistor is connected to the control chip through a first connecting line, the first end of the first resistor is connected to the output end of the power supply circuit, and the second end of the first resistor is connected to the first connecting line; The collector of the transistor is connected to the first end of the second resistor through a second connecting line, the second end of the second resistor is connected to the output end of the power supply circuit, and the first end of the third resistor is connected to the second connecting line; The emitter base of the transistor is grounded through a third connecting line, the anode of the second voltage stabilizing diode is connected to the third connecting line, and the cathode of the second voltage stabilizing diode is connected to the first end of the second resistor; The second end of the third resistor is connected to the main controller via a fourth connecting line; A first end of the second capacitor is connected to the fourth connecting line, and a second end of the second capacitor is connected to the anode of the second voltage stabilizing diode.

8. The refrigerator according to claim 6 or 7, characterized in that: The main controller is configured as follows: If the actual speed is less than the target speed, the frequency of the subsequent PWM signal is adjusted so that the actual speed of the fan coil reaches the target speed.

9. A refrigerator control method, 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 configured to provide power for the refrigeration cycle of the refrigerator, and the fan is configured to allow air to enter the evaporator of the refrigerator for heat exchange and send the heat-released air into the storage room; the fan includes a control chip; A main controller connected to the control chip, configured to send a pulse width modulation (PWM) signal to the control chip; Wherein, the fan further comprises a fan coil, and the control chip is connected to the fan coil; The method comprises: Outputting a pulse signal to the fan coil according to the PWM signal, wherein the pulse signal is used to drive the fan coil to rotate; Acquiring the current and / or input voltage of the fan coil, and if the current exceeds the rated current and / or the input voltage exceeds the rated voltage, disconnecting the fan coil from the control chip; After the fan coil is disconnected from the control chip for a preset time, it is determined whether to connect the fan coil to the control chip according to the current current and / or the current input voltage of the fan coil.

10. A refrigerator, characterized in that: The refrigerator comprises: A box body, wherein a storage room is arranged in the box body; A refrigeration system disposed in the box includes a compressor, an evaporator and a fan, wherein the compressor is configured to provide power for a refrigeration cycle of the refrigerator, and the fan is configured to allow air to enter the evaporator of the refrigerator for heat exchange and send the heat-released air into the storage room; A main controller connected to the fan, configured to send a PWM signal to the fan; The fan comprises a fan coil, and the fan is configured as follows: Outputting a pulse signal to the fan coil according to the PWM signal, wherein the pulse signal is used to drive the fan coil to rotate; Obtaining the current and / or input voltage of the fan coil; If the current exceeds the rated current, and / or the input voltage exceeds the rated voltage, the circuit of the fan coil is cut off; After the circuit of the fan coil is cut off for a preset time period, the circuit of the fan coil is connected.

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